--- product: Chilkat product_version: 11.7.0 language: c language_label: C class: Compression license: bundle deprecated: false reference_html: https://www.chilkatsoft.com/refdoc/c_CkCompressionRef.html --- # Chilkat Compression — C — v11.7.0 > Chilkat 11.7.0 · language=c · class=Compression > Other versions: replace `11.7.0` in this URL. Other languages: `https://www.chilkatsoft.com/ai-docs/v/11.7.0//classes/Compression.md`. > Language-wide rules (install, unlock, error model, strings/bytes): `https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/guide.md`. ## Purpose **Compress and decompress bytes, text, files, and streams with a flexible API.** `Chilkat.Compression` provides a general-purpose API for compressing and decompressing data in memory, files, and streams. It supports multiple algorithms, text charset conversion, encoded output, chunked processing, and streaming operations for large data. **Multiple algorithms** Supports `deflate`, `zlib`, `bzip2`, and `lzw`. **Flexible data types** Work with byte arrays, strings, `BinData`, `StringBuilder`, files, and streams. **Chunked processing** Process data incrementally with `FirstChunk` and `LastChunk` for chunk-aware methods. **Encoded output** Return compressed bytes as text using encodings such as `base64`, `hex`, and others. **Streaming support** Compress or decompress large files and streams with stable memory usage. **Compression + encryption** Combine compression and encryption in file workflows with integrated methods. **Tip:** For text compression, explicitly set `Charset = "utf-8"` unless another encoding is required. For encoded compressed data, set `EncodingMode` to the desired output format. For an extended overview, see [Compression Class Overview](https://www.chilkatsoft.com/compression_class_overview.asp). See also [Binary Encodings](https://www.chilkatsoft.com/binary_encodings.asp) for supported encoded output formats. ## Object creation, unlocking and error handling **Create/Dispose** ```c HCkCompression instance = CkCompression_Create(); // ... CkCompression_Dispose(instance); ``` `HCkCompression CkCompression_Create(void);` Creates an instance of the HCkCompression object and returns a handle ("void \*" pointer). The handle is passed in the 1st argument for the functions listed on this page. `void CkCompression_Dispose(HCkCompression handle);` Objects created by calling CkCompression_Create must be freed by calling this method. A memory leak occurs if a handle is not disposed by calling this function. Also, any handle returned by a Chilkat "C" function must also be freed by the application by calling the appropriate Dispose method, such as CkCompression_Dispose. Call `Global.UnlockBundle` once at the start of the program, before using this or any other Chilkat class. Any string unlocks a fully functional 30-day trial; a purchased unlock code is used in production. See `guide.md` for the exact code in C. ## Members common to every Chilkat class Documented once per language in `common-members.md`; listed here so this page is self-contained. | Property | Signature | Access | Meaning | |---|---|---|---| | `DebugLogFilePath` | `void CkCompression_getDebugLogFilePath(HCkCompression cHandle, HCkString retval); void CkCompression_putDebugLogFilePath(HCkCompression cHandle, const char *newVal); const char *CkCompression_debugLogFilePath(HCkCompression cHandle);` | read/write | If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. | | `LastErrorHtml` | `void CkCompression_getLastErrorHtml(HCkCompression cHandle, HCkString retval); const char *CkCompression_lastErrorHtml(HCkCompression cHandle);` | read-only | Provides HTML-formatted information about the last called method or property. | | `LastErrorText` | `void CkCompression_getLastErrorText(HCkCompression cHandle, HCkString retval); const char *CkCompression_lastErrorText(HCkCompression cHandle);` | read-only | Provides plain text information about the last called method or property. | | `LastErrorXml` | `void CkCompression_getLastErrorXml(HCkCompression cHandle, HCkString retval); const char *CkCompression_lastErrorXml(HCkCompression cHandle);` | read-only | Provides XML-formatted information about the last called method or property. | | `LastMethodSuccess` | `BOOL CkCompression_getLastMethodSuccess(HCkCompression cHandle); void CkCompression_putLastMethodSuccess(HCkCompression cHandle, BOOL newVal);` | read/write | Indicates the success or failure of the most recent method call: `TRUE` means success, `FALSE` means failure. | | `Utf8` | `BOOL CkCompression_getUtf8(HCkCompression cHandle); void CkCompression_putUtf8(HCkCompression cHandle, BOOL newVal);` | read/write | When set to `TRUE`, all `const char *` arguments and return values are interpreted as UTF-8 strings. | | `VerboseLogging` | `BOOL CkCompression_getVerboseLogging(HCkCompression cHandle); void CkCompression_putVerboseLogging(HCkCompression cHandle, BOOL newVal);` | read/write | If set to `TRUE`, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. | | `Version` | `void CkCompression_getVersion(HCkCompression cHandle, HCkString retval); const char *CkCompression_version(HCkCompression cHandle);` | read-only | Version of the component/library, such as "10.1.0" | ## Member index | Member | Kind | Signature | |---|---|---| | `Algorithm` | property, read/write | `void CkCompression_getAlgorithm(HCkCompression cHandle, HCkString retval); void CkCompression_putAlgorithm(HCkCompression cHandle, const char *newVal); const char *CkCompression_algorithm(HCkCompression cHandle);` | | `Charset` | property, read/write | `void CkCompression_getCharset(HCkCompression cHandle, HCkString retval); void CkCompression_putCharset(HCkCompression cHandle, const char *newVal); const char *CkCompression_charset(HCkCompression cHandle);` | | `DeflateLevel` | property, read/write | `int CkCompression_getDeflateLevel(HCkCompression cHandle); void CkCompression_putDeflateLevel(HCkCompression cHandle, int newVal);` | | `EncodingMode` | property, read/write | `void CkCompression_getEncodingMode(HCkCompression cHandle, HCkString retval); void CkCompression_putEncodingMode(HCkCompression cHandle, const char *newVal); const char *CkCompression_encodingMode(HCkCompression cHandle);` | | `FirstChunk` | property, read/write | `BOOL CkCompression_getFirstChunk(HCkCompression cHandle); void CkCompression_putFirstChunk(HCkCompression cHandle, BOOL newVal);` | | `HeartbeatMs` | property, read/write | `int CkCompression_getHeartbeatMs(HCkCompression cHandle); void CkCompression_putHeartbeatMs(HCkCompression cHandle, int newVal);` | | `LastChunk` | property, read/write | `BOOL CkCompression_getLastChunk(HCkCompression cHandle); void CkCompression_putLastChunk(HCkCompression cHandle, BOOL newVal);` | | `UncommonOptions` | property, read/write | `void CkCompression_getUncommonOptions(HCkCompression cHandle, HCkString retval); void CkCompression_putUncommonOptions(HCkCompression cHandle, const char *newVal); const char *CkCompression_uncommonOptions(HCkCompression cHandle);` | | `CompressBd` | method | `BOOL CkCompression_CompressBd(HCkCompression cHandle, HCkBinData bd);` | | `CompressBd2` | method | `BOOL CkCompression_CompressBd2(HCkCompression cHandle, HCkBinData bdIn, HCkBinData bdOut);` | | `CompressEncryptFile` | method | `BOOL CkCompression_CompressEncryptFile(HCkCompression cHandle, HCkJsonObject cryptParams, const char *srcPath, const char *destPath);` | | `CompressFile` | method | `BOOL CkCompression_CompressFile(HCkCompression cHandle, const char *srcPath, const char *destPath);` | | `CompressSb` | method | `BOOL CkCompression_CompressSb(HCkCompression cHandle, HCkStringBuilder sb, HCkBinData binData);` | | `CompressStream` | method | `BOOL CkCompression_CompressStream(HCkCompression cHandle, HCkStream strm);` | | `CompressStringENC` | method | `BOOL CkCompression_CompressStringENC(HCkCompression cHandle, const char *str, HCkString outStr); const char *CkCompression_compressStringENC(HCkCompression cHandle, const char *str);` | | `DecompressBd` | method | `BOOL CkCompression_DecompressBd(HCkCompression cHandle, HCkBinData bd);` | | `DecompressBd2` | method | `BOOL CkCompression_DecompressBd2(HCkCompression cHandle, HCkBinData bdIn, HCkBinData bdOut);` | | `DecompressFile` | method | `BOOL CkCompression_DecompressFile(HCkCompression cHandle, const char *srcPath, const char *destPath);` | | `DecompressSb` | method | `BOOL CkCompression_DecompressSb(HCkCompression cHandle, HCkBinData binData, HCkStringBuilder sb);` | | `DecompressStream` | method | `BOOL CkCompression_DecompressStream(HCkCompression cHandle, HCkStream strm);` | | `DecompressStringENC` | method | `BOOL CkCompression_DecompressStringENC(HCkCompression cHandle, const char *encodedCompressedData, HCkString outStr); const char *CkCompression_decompressStringENC(HCkCompression cHandle, const char *encodedCompressedData);` | | `DecryptDecompressFile` | method | `BOOL CkCompression_DecryptDecompressFile(HCkCompression cHandle, HCkJsonObject cryptParams, const char *srcPath, const char *destPath);` | | `LoadTaskCaller` | method | `BOOL CkCompression_LoadTaskCaller(HCkCompression cHandle, HCkTask task);` | Deprecated members are listed at the end of this file with their replacements; do not use them in new code. ## Properties ### Compression.Algorithm `Chilkat 11.7.0 · c · Compression · Algorithm · property · read/write` ```c void CkCompression_getAlgorithm(HCkCompression cHandle, HCkString retval); void CkCompression_putAlgorithm(HCkCompression cHandle, const char *newVal); const char *CkCompression_algorithm(HCkCompression cHandle); ``` Specifies the compression algorithm to use. Supported values are `deflate`, `zlib`, `gzip`, `bzip2`, and `lzw`. The `zlib` option is the deflate algorithm with a zlib header. The `gzip` option (starting in v11.7.0) is the deflate algorithm in the gzip format (RFC 1952): a gzip header, the deflate data, and a trailer with the CRC-32 and size of the uncompressed data. When decompressing in one call, the CRC-32 and size are checked. Before v11.7.0, `gzip` was not recognized and was treated as `deflate`. **Note:** `ppmd` is deprecated and should not be used. It was only available on 32-bit systems and specifically used the J variant. New applications should use one of the supported algorithms listed above. ### Compression.Charset `Chilkat 11.7.0 · c · Compression · Charset · property · read/write` ```c void CkCompression_getCharset(HCkCompression cHandle, HCkString retval); void CkCompression_putCharset(HCkCompression cHandle, const char *newVal); const char *CkCompression_charset(HCkCompression cHandle); ``` **Full documentation for this property (same in every language):** [How Character Encoding (Charset) Affects Compression and Decompression](https://www.chilkatsoft.com/ai-docs/v/11.7.0/articles/how_charset_affects_compression.md) · [Full List of Character Encodings Supported by Chilkat](https://www.chilkatsoft.com/ai-docs/v/11.7.0/articles/charsets_supported_by_chilkat.md) Specifies the character encoding used when converting text to bytes before compression, and bytes back to text after decompression. The current default is the computer’s ANSI charset, such as Windows-1252 on many Western Windows systems. However, most modern applications should explicitly set this property to `utf-8`. **Recommendation:** Set `Charset = "utf-8"` unless you specifically need compatibility with another encoding. ### Compression.DeflateLevel `Chilkat 11.7.0 · c · Compression · DeflateLevel · property · read/write · since 9.5.0.73` ```c int CkCompression_getDeflateLevel(HCkCompression cHandle); void CkCompression_putDeflateLevel(HCkCompression cHandle, int newVal); ``` Sets the compression level used by the `deflate` and `zlib` algorithms. - `0` means no compression. - `9` means maximum compression. - The default value is `6`. Higher values may produce smaller output but can require more processing time. ### Compression.EncodingMode `Chilkat 11.7.0 · c · Compression · EncodingMode · property · read/write` ```c void CkCompression_getEncodingMode(HCkCompression cHandle, HCkString retval); void CkCompression_putEncodingMode(HCkCompression cHandle, const char *newVal); const char *CkCompression_encodingMode(HCkCompression cHandle); ``` **Full documentation for this property (same in every language):** [Binary Encodings Supported by Chilkat](https://www.chilkatsoft.com/ai-docs/v/11.7.0/articles/binary_encodings.md) Specifies the text encoding used by methods whose names end in `ENC`, such as `CompressBytesENC` and `DecompressStringENC`. Compression methods ending in `ENC` return compressed binary data as an encoded string. Decompression methods ending in `ENC` expect the input string to use this same encoding. Valid values include: - `base64` - `hex` - `url` - `quoted-printable` ### Compression.FirstChunk `Chilkat 11.7.0 · c · Compression · FirstChunk · property · read/write · since 11.0.0` ```c BOOL CkCompression_getFirstChunk(HCkCompression cHandle); void CkCompression_putFirstChunk(HCkCompression cHandle, BOOL newVal); ``` Indicates that the next chunk-aware compression or decompression call is the first chunk in a sequence. The default value is `TRUE`. When both `FirstChunk` and `LastChunk` are `TRUE`, the method call is treated as a complete, single-call compression or decompression operation. ### Compression.HeartbeatMs `Chilkat 11.7.0 · c · Compression · HeartbeatMs · property · read/write` ```c int CkCompression_getHeartbeatMs(HCkCompression cHandle); void CkCompression_putHeartbeatMs(HCkCompression cHandle, int newVal); ``` **Full documentation for this property (same in every language):** [Event Callback Examples](https://www.chilkatsoft.com/ai-docs/v/11.7.0/articles/event_callback_examples.md) Specifies the interval, in milliseconds, between `AbortCheck` event callbacks. This allows an application to periodically check whether a long-running operation should be aborted. The default value is `0`, which disables `AbortCheck` callbacks. ### Compression.LastChunk `Chilkat 11.7.0 · c · Compression · LastChunk · property · read/write · since 11.0.0` ```c BOOL CkCompression_getLastChunk(HCkCompression cHandle); void CkCompression_putLastChunk(HCkCompression cHandle, BOOL newVal); ``` Indicates that the next chunk-aware compression or decompression call is the final chunk in a sequence. The default value is `TRUE`. When both `FirstChunk` and `LastChunk` are `TRUE`, the input is treated as the complete data set and processed in a single call. ### Compression.UncommonOptions `Chilkat 11.7.0 · c · Compression · UncommonOptions · property · read/write · since 11.0.0` ```c void CkCompression_getUncommonOptions(HCkCompression cHandle, HCkString retval); void CkCompression_putUncommonOptions(HCkCompression cHandle, const char *newVal); const char *CkCompression_uncommonOptions(HCkCompression cHandle); ``` Provides a way to enable specialized or uncommon behavior. This property normally remains empty. It may be set to a comma-separated list of keywords. Supported option: - `Crypt2CompressHdr` — Duplicates the compression/decompression header behavior used by the deprecated and removed Crypt2 compression functions. ## Methods ### Compression.CompressBd `Chilkat 11.7.0 · c · Compression · CompressBd · method · since 9.5.0.66` ```c BOOL CkCompression_CompressBd(HCkCompression cHandle, HCkBinData bd); ``` Compresses the data contained in a `BinData` object. The `BinData` object is modified to contain the compressed result. This method is not `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `CompressBdAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.CompressBd2 `Chilkat 11.7.0 · c · Compression · CompressBd2 · method · since 11.0.0` ```c BOOL CkCompression_CompressBd2(HCkCompression cHandle, HCkBinData bdIn, HCkBinData bdOut); ``` Compresses the data in one `BinData` object and appends the compressed output to another `BinData` object. The input `BinData` is not modified. This method is `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `CompressBd2Async` — same arguments, returns a `Task` (see Async variants below). ### Compression.CompressEncryptFile `Chilkat 11.7.0 · c · Compression · CompressEncryptFile · method · since 9.5.0.99` ```c BOOL CkCompression_CompressEncryptFile(HCkCompression cHandle, HCkJsonObject cryptParams, const char *srcPath, const char *destPath); ``` Compresses and encrypts a file, writing the result to a destination file. The compression and encryption are performed internally in streaming mode, so files of any size can be processed without loading the entire file into memory. Returns TRUE for success, FALSE for failure. Async variant: `CompressEncryptFileAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.CompressFile `Chilkat 11.7.0 · c · Compression · CompressFile · method` ```c BOOL CkCompression_CompressFile(HCkCompression cHandle, const char *srcPath, const char *destPath); ``` Compresses a source file and writes the compressed data to a destination file. The file is processed internally in streaming mode, allowing files of any size to be compressed with stable memory usage. Returns TRUE for success, FALSE for failure. Async variant: `CompressFileAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.CompressSb `Chilkat 11.7.0 · c · Compression · CompressSb · method · since 9.5.0.73` ```c BOOL CkCompression_CompressSb(HCkCompression cHandle, HCkStringBuilder sb, HCkBinData binData); ``` Compresses the text contained in a `StringBuilder` and appends the compressed bytes to a `BinData` object. Text is converted to bytes according to the `Charset` property. This method is `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `CompressSbAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.CompressStream `Chilkat 11.7.0 · c · Compression · CompressStream · method · since 9.5.0.56` ```c BOOL CkCompression_CompressStream(HCkCompression cHandle, HCkStream strm); ``` Compresses data from a stream source and writes the compressed data to the stream sink. The operation is performed in streaming mode, making it suitable for very large or even continuous streams while maintaining stable memory usage. Returns TRUE for success, FALSE for failure. Async variant: `CompressStreamAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.CompressStringENC `Chilkat 11.7.0 · c · Compression · CompressStringENC · method` ```c BOOL CkCompression_CompressStringENC(HCkCompression cHandle, const char *str, HCkString outStr); const char *CkCompression_compressStringENC(HCkCompression cHandle, const char *str); ``` Compresses a string and returns the compressed result as an encoded string. The string is first converted to bytes using `Charset`, then compressed, and finally encoded according to `EncodingMode`. This method is not `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `CompressStringENCAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecompressBd `Chilkat 11.7.0 · c · Compression · DecompressBd · method · since 9.5.0.66` ```c BOOL CkCompression_DecompressBd(HCkCompression cHandle, HCkBinData bd); ``` Decompresses the compressed data contained in a `BinData` object. The `BinData` object is modified to contain the decompressed result. This method is not `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `DecompressBdAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecompressBd2 `Chilkat 11.7.0 · c · Compression · DecompressBd2 · method · since 11.0.0` ```c BOOL CkCompression_DecompressBd2(HCkCompression cHandle, HCkBinData bdIn, HCkBinData bdOut); ``` Decompresses the data in one `BinData` object and appends the decompressed output to another `BinData` object. The input `BinData` is not modified. This method is `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `DecompressBd2Async` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecompressFile `Chilkat 11.7.0 · c · Compression · DecompressFile · method` ```c BOOL CkCompression_DecompressFile(HCkCompression cHandle, const char *srcPath, const char *destPath); ``` Decompresses a source file and writes the decompressed data to a destination file. The file is processed internally in streaming mode, allowing files of any size to be decompressed without loading the entire file into memory. Returns TRUE for success, FALSE for failure. Async variant: `DecompressFileAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecompressSb `Chilkat 11.7.0 · c · Compression · DecompressSb · method · since 9.5.0.73` ```c BOOL CkCompression_DecompressSb(HCkCompression cHandle, HCkBinData binData, HCkStringBuilder sb); ``` Decompresses compressed data from a `BinData` object and appends the resulting text to a `StringBuilder`. The decompressed bytes are converted to text using the `Charset` property. This method is `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `DecompressSbAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecompressStream `Chilkat 11.7.0 · c · Compression · DecompressStream · method · since 9.5.0.56` ```c BOOL CkCompression_DecompressStream(HCkCompression cHandle, HCkStream strm); ``` Decompresses data from a stream source and writes the decompressed data to the stream sink. The operation is performed in streaming mode, making it suitable for very large or continuous streams while maintaining stable memory usage. Returns TRUE for success, FALSE for failure. Async variant: `DecompressStreamAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecompressStringENC `Chilkat 11.7.0 · c · Compression · DecompressStringENC · method` ```c BOOL CkCompression_DecompressStringENC(HCkCompression cHandle, const char *encodedCompressedData, HCkString outStr); const char *CkCompression_decompressStringENC(HCkCompression cHandle, const char *encodedCompressedData); ``` Decompresses compressed data supplied as an encoded string and returns the resulting text. The input string is decoded according to `EncodingMode`, then decompressed. The resulting bytes are converted to text using `Charset`. This method is not `FirstChunk` / `LastChunk` aware. Returns TRUE for success, FALSE for failure. Async variant: `DecompressStringENCAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.DecryptDecompressFile `Chilkat 11.7.0 · c · Compression · DecryptDecompressFile · method · since 9.5.0.99` ```c BOOL CkCompression_DecryptDecompressFile(HCkCompression cHandle, HCkJsonObject cryptParams, const char *srcPath, const char *destPath); ``` Decrypts and decompresses a file, writing the restored data to a destination file. This is the reverse operation of `CompressEncryptFile`. Returns TRUE for success, FALSE for failure. Async variant: `DecryptDecompressFileAsync` — same arguments, returns a `Task` (see Async variants below). ### Compression.LoadTaskCaller `Chilkat 11.7.0 · c · Compression · LoadTaskCaller · method · since 9.5.0.80` ```c BOOL CkCompression_LoadTaskCaller(HCkCompression cHandle, HCkTask task); ``` Loads the caller of the task's async method. Returns TRUE for success, FALSE for failure. ## Events and callbacks This binding delivers progress information through callbacks (AbortCheck, PercentDone, ProgressInfo, TaskCompleted) rather than events. See `guide.md` for how to attach them in C. ## Async variants Each returns a `Task` instead of the result and takes the same arguments as the synchronous method; run the task, wait for `Finished`, then read the result from the task. No new Async methods are added from 11.7.0 on. ```c HCkTask CkCompression_CompressBdAsync(HCkCompression cHandle, HCkBinData bd); HCkTask CkCompression_CompressBd2Async(HCkCompression cHandle, HCkBinData bdIn, HCkBinData bdOut); HCkTask CkCompression_CompressEncryptFileAsync(HCkCompression cHandle, HCkJsonObject cryptParams, const char *srcPath, const char *destPath); HCkTask CkCompression_CompressFileAsync(HCkCompression cHandle, const char *srcPath, const char *destPath); HCkTask CkCompression_CompressSbAsync(HCkCompression cHandle, HCkStringBuilder sb, HCkBinData binData); HCkTask CkCompression_CompressStreamAsync(HCkCompression cHandle, HCkStream strm); HCkTask CkCompression_CompressStringENCAsync(HCkCompression cHandle, const char *str); HCkTask CkCompression_DecompressBdAsync(HCkCompression cHandle, HCkBinData bd); HCkTask CkCompression_DecompressBd2Async(HCkCompression cHandle, HCkBinData bdIn, HCkBinData bdOut); HCkTask CkCompression_DecompressFileAsync(HCkCompression cHandle, const char *srcPath, const char *destPath); HCkTask CkCompression_DecompressSbAsync(HCkCompression cHandle, HCkBinData binData, HCkStringBuilder sb); HCkTask CkCompression_DecompressStreamAsync(HCkCompression cHandle, HCkStream strm); HCkTask CkCompression_DecompressStringENCAsync(HCkCompression cHandle, const char *encodedCompressedData); HCkTask CkCompression_DecryptDecompressFileAsync(HCkCompression cHandle, HCkJsonObject cryptParams, const char *srcPath, const char *destPath); ``` ## Deprecated members — do not use in new code | Member | Kind | Deprecated in | Use instead | |---|---|---|---| | `BeginCompressBytes` | method | before 11.6.1 | `FirstChunk` | | `BeginCompressBytes2` | method | before 11.6.1 | `FirstChunk` | | `BeginCompressBytesENC` | method | before 11.6.1 | — | | `BeginCompressString` | method | before 11.6.1 | `FirstChunk` | | `BeginCompressStringENC` | method | before 11.6.1 | `FirstChunk` | | `BeginDecompressBytes` | method | before 11.6.1 | `FirstChunk` | | `BeginDecompressBytes2` | method | before 11.6.1 | `FirstChunk` | | `BeginDecompressBytesENC` | method | before 11.6.1 | `FirstChunk` | | `BeginDecompressString` | method | before 11.6.1 | `FirstChunk` | | `BeginDecompressStringENC` | method | before 11.6.1 | `FirstChunk` | | `CompressBytes` | method | before 11.6.1 | — | | `CompressBytes2` | method | before 11.6.1 | — | | `CompressBytesENC` | method | before 11.6.1 | — | | `CompressStr` | method | before 11.6.1 | — | | `CompressString` | method | before 11.6.1 | — | | `DecompressBytes` | method | before 11.6.1 | — | | `DecompressBytes2` | method | before 11.6.1 | — | | `DecompressBytesENC` | method | before 11.6.1 | — | | `DecompressString` | method | before 11.6.1 | — | | `EndCompressBytes` | method | before 11.6.1 | — | | `EndCompressBytesENC` | method | before 11.6.1 | — | | `EndCompressString` | method | before 11.6.1 | — | | `EndCompressStringENC` | method | before 11.6.1 | — | | `EndDecompressBytes` | method | before 11.6.1 | — | | `EndDecompressBytesENC` | method | before 11.6.1 | — | | `EndDecompressString` | method | before 11.6.1 | — | | `EndDecompressStringENC` | method | before 11.6.1 | — | | `MoreCompressBytes` | method | before 11.6.1 | — | | `MoreCompressBytes2` | method | before 11.6.1 | — | | `MoreCompressBytesENC` | method | before 11.6.1 | — | | `MoreCompressString` | method | before 11.6.1 | — | | `MoreCompressStringENC` | method | before 11.6.1 | — | | `MoreDecompressBytes` | method | before 11.6.1 | — | | `MoreDecompressBytes2` | method | before 11.6.1 | — | | `MoreDecompressBytesENC` | method | before 11.6.1 | — | | `MoreDecompressString` | method | before 11.6.1 | — | | `MoreDecompressStringENC` | method | before 11.6.1 | — | ## Related classes [`BinData`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/classes/BinData.md), [`JsonObject`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/classes/JsonObject.md), [`Stream`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/classes/Stream.md), [`StringBuilder`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/classes/StringBuilder.md), [`Task`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/classes/Task.md)