---
product: Chilkat
product_version: 11.7.0
language: c
language_label: C
class: Asn
license: bundle
deprecated: false
reference_html: https://www.chilkatsoft.com/refdoc/c_CkAsnRef.html
---
# Chilkat Asn — C — v11.7.0

> Chilkat 11.7.0 · language=c · class=Asn
> Other versions: replace `11.7.0` in this URL. Other languages: `https://www.chilkatsoft.com/ai-docs/v/11.7.0/<lang>/classes/Asn.md`.
> Language-wide rules (install, unlock, error model, strings/bytes): `https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/guide.md`.

## Purpose

**Load, inspect, build, edit, and encode ASN.1 structures in DER or XML form.**

`Chilkat.Asn` represents an ASN.1 item and its optional child items. It can load ASN.1 from binary DER, encoded DER strings, files, or `BinData`; expose tags, tag values, primitive content, boolean and integer values, and child counts; build constructed structures such as `SEQUENCE` and `SET`; append common primitive types such as booleans, integers, big integers, bit strings, octets, OIDs, strings, times, null values, and context-specific items; convert ASN.1 to XML; reload from that XML form; and write the final structure back to DER.

**Load DER data**

Load ASN.1 from binary DER bytes, encoded text such as Base64 or hex, files, or existing `BinData` objects.

**Inspect ASN.1 items**

Read the item tag, tag value, constructed/primitive state, sub-item count, string content, boolean value, or integer value.

**Build sequences and sets**

Append constructed `SEQUENCE` and `SET` items, then add child ASN.1 values beneath them.

**Append primitive values**

Add booleans, integers, big integers, bit strings, octet strings, OIDs, strings, times, null values, and encoded byte content.

**Context-specific tags**

Add context-specific primitive or constructed items when working with ASN.1 formats that use tagged application-specific structures.

**DER and XML conversion**

Convert ASN.1 to XML for inspection or editing, load ASN.1 back from XML, and output the result as binary or encoded DER.

**Common pattern:** Load existing DER with `LoadBinary`, `LoadEncoded`, `LoadBd`, or `LoadBinaryFile`, inspect the tree with `Tag`, `Constructed`, `NumSubItems`, and `GetSubItem`, then extract primitive content or convert to XML with `AsnToXml`. To create ASN.1, start with a constructed item, append child values, and write the final DER with `GetBinaryDer`, `GetEncodedDer`, `WriteBd`, or `WriteBinaryDer`.

## Object creation, unlocking and error handling

**Create/Dispose**

```c
HCkAsn instance = CkAsn_Create();
// ...
CkAsn_Dispose(instance);
```

`HCkAsn CkAsn_Create(void);`

Creates an instance of the HCkAsn object and returns a handle ("void \*" pointer). The handle is passed in the 1st argument for the functions listed on this page.

`void CkAsn_Dispose(HCkAsn handle);`

Objects created by calling CkAsn_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 CkAsn_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 CkAsn_getDebugLogFilePath(HCkAsn cHandle, HCkString retval); void CkAsn_putDebugLogFilePath(HCkAsn cHandle, const char *newVal); const char *CkAsn_debugLogFilePath(HCkAsn 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 CkAsn_getLastErrorHtml(HCkAsn cHandle, HCkString retval); const char *CkAsn_lastErrorHtml(HCkAsn cHandle);` | read-only | Provides HTML-formatted information about the last called method or property. |
| `LastErrorText` | `void CkAsn_getLastErrorText(HCkAsn cHandle, HCkString retval); const char *CkAsn_lastErrorText(HCkAsn cHandle);` | read-only | Provides plain text information about the last called method or property. |
| `LastErrorXml` | `void CkAsn_getLastErrorXml(HCkAsn cHandle, HCkString retval); const char *CkAsn_lastErrorXml(HCkAsn cHandle);` | read-only | Provides XML-formatted information about the last called method or property. |
| `LastMethodSuccess` | `BOOL CkAsn_getLastMethodSuccess(HCkAsn cHandle); void CkAsn_putLastMethodSuccess(HCkAsn cHandle, BOOL newVal);` | read/write | Indicates the success or failure of the most recent method call: `TRUE` means success, `FALSE` means failure. |
| `Utf8` | `BOOL CkAsn_getUtf8(HCkAsn cHandle); void CkAsn_putUtf8(HCkAsn cHandle, BOOL newVal);` | read/write | When set to `TRUE`, all `const char *` arguments and return values are interpreted as UTF-8 strings. |
| `VerboseLogging` | `BOOL CkAsn_getVerboseLogging(HCkAsn cHandle); void CkAsn_putVerboseLogging(HCkAsn 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 CkAsn_getVersion(HCkAsn cHandle, HCkString retval); const char *CkAsn_version(HCkAsn cHandle);` | read-only | Version of the component/library, such as "10.1.0" |

## Member index

| Member | Kind | Signature |
|---|---|---|
| `BoolValue` | property, read/write | `BOOL CkAsn_getBoolValue(HCkAsn cHandle); void CkAsn_putBoolValue(HCkAsn cHandle, BOOL newVal);` |
| `Constructed` | property, read-only | `BOOL CkAsn_getConstructed(HCkAsn cHandle);` |
| `ContentStr` | property, read/write | `void CkAsn_getContentStr(HCkAsn cHandle, HCkString retval); void CkAsn_putContentStr(HCkAsn cHandle, const char *newVal); const char *CkAsn_contentStr(HCkAsn cHandle);` |
| `IntValue` | property, read/write | `int CkAsn_getIntValue(HCkAsn cHandle); void CkAsn_putIntValue(HCkAsn cHandle, int newVal);` |
| `NumSubItems` | property, read-only | `int CkAsn_getNumSubItems(HCkAsn cHandle);` |
| `Tag` | property, read-only | `void CkAsn_getTag(HCkAsn cHandle, HCkString retval); const char *CkAsn_tag(HCkAsn cHandle);` |
| `TagValue` | property, read-only | `int CkAsn_getTagValue(HCkAsn cHandle);` |
| `AppendBigInt` | method | `BOOL CkAsn_AppendBigInt(HCkAsn cHandle, const char *encodedBytes, const char *encoding);` |
| `AppendBits` | method | `BOOL CkAsn_AppendBits(HCkAsn cHandle, const char *encodedBytes, const char *encoding);` |
| `AppendBool` | method | `BOOL CkAsn_AppendBool(HCkAsn cHandle, BOOL value);` |
| `AppendContextConstructed` | method | `BOOL CkAsn_AppendContextConstructed(HCkAsn cHandle, int tag);` |
| `AppendContextPrimitive` | method | `BOOL CkAsn_AppendContextPrimitive(HCkAsn cHandle, int tag, const char *encodedBytes, const char *encoding);` |
| `AppendInt` | method | `BOOL CkAsn_AppendInt(HCkAsn cHandle, int value);` |
| `AppendNull` | method | `BOOL CkAsn_AppendNull(HCkAsn cHandle);` |
| `AppendOctets` | method | `BOOL CkAsn_AppendOctets(HCkAsn cHandle, const char *encodedBytes, const char *encoding);` |
| `AppendOid` | method | `BOOL CkAsn_AppendOid(HCkAsn cHandle, const char *oid);` |
| `AppendSequence` | method | `BOOL CkAsn_AppendSequence(HCkAsn cHandle);` |
| `AppendSequence2` | method | `BOOL CkAsn_AppendSequence2(HCkAsn cHandle);` |
| `AppendSequenceR` | method | `HCkAsn CkAsn_AppendSequenceR(HCkAsn cHandle);` |
| `AppendSet` | method | `BOOL CkAsn_AppendSet(HCkAsn cHandle);` |
| `AppendSet2` | method | `BOOL CkAsn_AppendSet2(HCkAsn cHandle);` |
| `AppendSetR` | method | `HCkAsn CkAsn_AppendSetR(HCkAsn cHandle);` |
| `AppendString` | method | `BOOL CkAsn_AppendString(HCkAsn cHandle, const char *strType, const char *value);` |
| `AppendTime` | method | `BOOL CkAsn_AppendTime(HCkAsn cHandle, const char *timeFormat, const char *dateTimeStr);` |
| `AsnToXml` | method | `BOOL CkAsn_AsnToXml(HCkAsn cHandle, HCkString outStr); const char *CkAsn_asnToXml(HCkAsn cHandle);` |
| `DeleteSubItem` | method | `BOOL CkAsn_DeleteSubItem(HCkAsn cHandle, int index);` |
| `GetEncodedContent` | method | `BOOL CkAsn_GetEncodedContent(HCkAsn cHandle, const char *encoding, HCkString outStr); const char *CkAsn_getEncodedContent(HCkAsn cHandle, const char *encoding);` |
| `GetEncodedDer` | method | `BOOL CkAsn_GetEncodedDer(HCkAsn cHandle, const char *encoding, HCkString outStr); const char *CkAsn_getEncodedDer(HCkAsn cHandle, const char *encoding);` |
| `GetLastSubItem` | method | `HCkAsn CkAsn_GetLastSubItem(HCkAsn cHandle);` |
| `GetSubItem` | method | `HCkAsn CkAsn_GetSubItem(HCkAsn cHandle, int index);` |
| `LoadAsnXml` | method | `BOOL CkAsn_LoadAsnXml(HCkAsn cHandle, const char *xmlStr);` |
| `LoadBd` | method | `BOOL CkAsn_LoadBd(HCkAsn cHandle, HCkBinData bd);` |
| `LoadBinaryFile` | method | `BOOL CkAsn_LoadBinaryFile(HCkAsn cHandle, const char *path);` |
| `LoadEncoded` | method | `BOOL CkAsn_LoadEncoded(HCkAsn cHandle, const char *asnContent, const char *encoding);` |
| `SetEncodedContent` | method | `BOOL CkAsn_SetEncodedContent(HCkAsn cHandle, const char *encodedBytes, const char *encoding);` |
| `WriteBd` | method | `BOOL CkAsn_WriteBd(HCkAsn cHandle, HCkBinData bd);` |
| `WriteBinaryDer` | method | `BOOL CkAsn_WriteBinaryDer(HCkAsn cHandle, const char *path);` |

Deprecated members are listed at the end of this file with their replacements; do not use them in new code.

## Properties

### Asn.BoolValue

`Chilkat 11.7.0 · c · Asn · BoolValue · property · read/write · since 9.5.0.49`

```c
BOOL CkAsn_getBoolValue(HCkAsn cHandle);
void CkAsn_putBoolValue(HCkAsn cHandle, BOOL newVal);
```

The ASN.1 item's boolean value if it is a boolean item.

### Asn.Constructed

`Chilkat 11.7.0 · c · Asn · Constructed · property · read-only · since 9.5.0.49`

```c
BOOL CkAsn_getConstructed(HCkAsn cHandle);
```

`TRUE` if this ASN.1 item is a constructed item. Sequence and Set items are constructed and can contain sub-items. All other tags (boolean, integer, octets, utf8String, etc.) are primitive (non-constructed).

### Asn.ContentStr

`Chilkat 11.7.0 · c · Asn · ContentStr · property · read/write · since 9.5.0.49`

```c
void CkAsn_getContentStr(HCkAsn cHandle, HCkString retval);
void CkAsn_putContentStr(HCkAsn cHandle, const char *newVal);
const char *CkAsn_contentStr(HCkAsn cHandle);
```

The ASN.1 item's content if it is an ASN.1 string type (such as Utf8String, BmpString, PrintableString, VisibleString, T61String, IA5String, NumericString, or UniversalString).

### Asn.IntValue

`Chilkat 11.7.0 · c · Asn · IntValue · property · read/write · since 9.5.0.49`

```c
int CkAsn_getIntValue(HCkAsn cHandle);
void CkAsn_putIntValue(HCkAsn cHandle, int newVal);
```

The ASN.1 item's integer value if it is a small integer item.

### Asn.NumSubItems

`Chilkat 11.7.0 · c · Asn · NumSubItems · property · read-only · since 9.5.0.49`

```c
int CkAsn_getNumSubItems(HCkAsn cHandle);
```

The number of sub-items contained within this ASN.1 item. Only constructed items, such as Sequence and Set will contain sub-iitems. Primitive items such as OIDs, octet strings, integers, etc. will never contain sub-items.

### Asn.Tag

`Chilkat 11.7.0 · c · Asn · Tag · property · read-only · since 9.5.0.49`

```c
void CkAsn_getTag(HCkAsn cHandle, HCkString retval);
const char *CkAsn_tag(HCkAsn cHandle);
```

The ASN.1 item's tag as a descriptive string. Possible values are:

```
boolean
integer
bitString
octets
null
oid
utf8String
relativeOid
sequence
set
numericString
printableString
t61String
ia5String
utcTime
bmpString
```

### Asn.TagValue

`Chilkat 11.7.0 · c · Asn · TagValue · property · read-only · since 9.5.0.49`

```c
int CkAsn_getTagValue(HCkAsn cHandle);
```

The ASN.1 item's tag as a integer value. The integer values for possible tags are as follows:

```
boolean (1)
integer (2)
bitString (3)
octets (4)
null (5)
oid (6)
utf8String (12)
relativeOid (13)
sequence (16)
set (17)
numericString (18)
printableString (19)
t61String (20)
ia5String (22)
utcTime (23)
bmpString (30)
```

## Methods

### Asn.AppendBigInt

`Chilkat 11.7.0 · c · Asn · AppendBigInt · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendBigInt(HCkAsn cHandle, const char *encodedBytes, const char *encoding);
```

Appends an ASN.1 integer, but one that is a big (huge) integer that is too large to be represented by an integer variable. The bytes composing the integer are passed in encoded string format (such as base64, hex, etc.). The byte order must be big-endian. The `encoding` may be any of the following encodings: `Base64`, `Hex`, `Base58`, `modBase64`, `Base32`, `UU`, `QP` (for quoted-printable), `URL` (for url-encoding), `Q`, `B`, `url_oath`, `url_rfc1738`, `url_rfc2396`, and `url_rfc3986`. The `encoding` name is case insensitive (for example, both `Base64` and `base64` are treated the same).

Returns TRUE for success, FALSE for failure.

### Asn.AppendBits

`Chilkat 11.7.0 · c · Asn · AppendBits · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendBits(HCkAsn cHandle, const char *encodedBytes, const char *encoding);
```

Appends an ASN.1 bit string to the caller's sub-items. The bytes containing the bits are passed in encoded string format (such as base64, hex, etc.). The byte order must be big-endian (MSB first). The `encoding` may be any of the following encodings: `Base64`, `Hex`, `Base58`, `modBase64`, `Base32`, `UU`, `QP` (for quoted-printable), `URL` (for url-encoding), `Q`, `B`, `url_oath`, `url_rfc1738`, `url_rfc2396`, and `url_rfc3986`. The `encoding` name is case insensitive (for example, both `Base64` and `base64` are treated the same).

Returns TRUE for success, FALSE for failure.

### Asn.AppendBool

`Chilkat 11.7.0 · c · Asn · AppendBool · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendBool(HCkAsn cHandle, BOOL value);
```

Appends an ASN.1 boolean item to the caller's sub-items. Items may only be appended to constructed data types such as Sequence and Set.

Returns TRUE for success, FALSE for failure.

### Asn.AppendContextConstructed

`Chilkat 11.7.0 · c · Asn · AppendContextConstructed · method · since 9.5.0.50`

```c
BOOL CkAsn_AppendContextConstructed(HCkAsn cHandle, int tag);
```

Appends an ASN.1 context-specific constructed item to the caller's sub-items.

Returns TRUE for success, FALSE for failure.

### Asn.AppendContextPrimitive

`Chilkat 11.7.0 · c · Asn · AppendContextPrimitive · method · since 9.5.0.50`

```c
BOOL CkAsn_AppendContextPrimitive(HCkAsn cHandle, int tag, const char *encodedBytes, const char *encoding);
```

Appends an ASN.1 context-specific primitive item to the caller's sub-items. The bytes are passed in encoded string format (such as base64, hex, etc.). The `encoding` may be any of the following encodings: `Base64`, `Hex`, `Base58`, `modBase64`, `Base32`, `UU`, `QP` (for quoted-printable), `URL` (for url-encoding), `Q`, `B`, `url_oath`, `url_rfc1738`, `url_rfc2396`, and `url_rfc3986`. The `encoding` name is case insensitive (for example, both `Base64` and `base64` are treated the same).

Returns TRUE for success, FALSE for failure.

### Asn.AppendInt

`Chilkat 11.7.0 · c · Asn · AppendInt · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendInt(HCkAsn cHandle, int value);
```

Appends an ASN.1 integer item to the caller's sub-items. Items may only be appended to constructed data types such as Sequence and Set.

Returns TRUE for success, FALSE for failure.

### Asn.AppendNull

`Chilkat 11.7.0 · c · Asn · AppendNull · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendNull(HCkAsn cHandle);
```

Appends an ASN.1 null item to the caller's sub-items. Items may only be appended to constructed data types such as Sequence and Set.

Returns TRUE for success, FALSE for failure.

### Asn.AppendOctets

`Chilkat 11.7.0 · c · Asn · AppendOctets · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendOctets(HCkAsn cHandle, const char *encodedBytes, const char *encoding);
```

Appends an ASN.1 octet string to the caller's sub-items. The bytes are passed in encoded string format (such as base64, hex, etc.). The `encoding` may be any of the following encodings: `Base64`, `Hex`, `Base58`, `modBase64`, `Base32`, `UU`, `QP` (for quoted-printable), `URL` (for url-encoding), `Q`, `B`, `url_oath`, `url_rfc1738`, `url_rfc2396`, and `url_rfc3986`. The `encoding` name is case insensitive (for example, both `Base64` and `base64` are treated the same).

Returns TRUE for success, FALSE for failure.

### Asn.AppendOid

`Chilkat 11.7.0 · c · Asn · AppendOid · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendOid(HCkAsn cHandle, const char *oid);
```

Appends an ASN.1 OID (object identifier) to the caller's sub-items. The OID is passed in string form, such as `1.2.840.113549.1.9.1`.

Returns TRUE for success, FALSE for failure.

### Asn.AppendSequence

`Chilkat 11.7.0 · c · Asn · AppendSequence · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendSequence(HCkAsn cHandle);
```

Appends an ASN.1 sequence item to the caller's sub-items.

Returns TRUE for success, FALSE for failure.

### Asn.AppendSequence2

`Chilkat 11.7.0 · c · Asn · AppendSequence2 · method · since 9.5.0.50`

```c
BOOL CkAsn_AppendSequence2(HCkAsn cHandle);
```

Appends an ASN.1 sequence item to the caller's sub-items, and updates the internal reference to point to the newly appended sequence item.

Returns TRUE for success, FALSE for failure.

### Asn.AppendSequenceR

`Chilkat 11.7.0 · c · Asn · AppendSequenceR · method · since 9.5.0.50`

```c
HCkAsn CkAsn_AppendSequenceR(HCkAsn cHandle);
```

Appends an ASN.1 sequence item to the caller's sub-items, and returns the newly appended sequence item.

Returns `NULL` on failure

### Asn.AppendSet

`Chilkat 11.7.0 · c · Asn · AppendSet · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendSet(HCkAsn cHandle);
```

Appends an ASN.1 set item to the caller's sub-items.

Returns TRUE for success, FALSE for failure.

### Asn.AppendSet2

`Chilkat 11.7.0 · c · Asn · AppendSet2 · method · since 9.5.0.50`

```c
BOOL CkAsn_AppendSet2(HCkAsn cHandle);
```

Appends an ASN.1 set item to the caller's sub-items, and updates the internal reference to point to the newly appended set item.

Returns TRUE for success, FALSE for failure.

### Asn.AppendSetR

`Chilkat 11.7.0 · c · Asn · AppendSetR · method · since 9.5.0.50`

```c
HCkAsn CkAsn_AppendSetR(HCkAsn cHandle);
```

Appends an ASN.1 set item to the caller's sub-items, and returns the newly appended set item.

Returns `NULL` on failure

### Asn.AppendString

`Chilkat 11.7.0 · c · Asn · AppendString · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendString(HCkAsn cHandle, const char *strType, const char *value);
```

Appends a string item to the caller's sub-items. The `strType` specifies the type of string to be added. It may be `utf8`, `ia5`, `t61`, `printable`, `visible`, `numeric`, `universal`, or `bmp`. The `value` must conform to the ASN.1 restrictions imposed for a given string type. The `utf8`, `bmp`, and `universal` types have no restrictions on what characters are allowed. In general, unless a specific type of string is required, choose the `utf8` type.

Returns TRUE for success, FALSE for failure.

### Asn.AppendTime

`Chilkat 11.7.0 · c · Asn · AppendTime · method · since 9.5.0.49`

```c
BOOL CkAsn_AppendTime(HCkAsn cHandle, const char *timeFormat, const char *dateTimeStr);
```

Appends a UTCTime item to the caller's sub-items. The `timeFormat` specifies the format of the `dateTimeStr`. It should be set to `utc`. (In the future, this method will be expanded to append GeneralizedTime items by using `generalized` for `timeFormat`.) To append the current date/time, set `dateTimeStr` equal to the empty string or the keyword `now`. Otherwise, the `dateTimeStr` should be in the UTC time format `YYMMDDhhmm[ss]Z` or `YYMMDDhhmm[ss](+|-)hhmm`.

Returns TRUE for success, FALSE for failure.

### Asn.AsnToXml

`Chilkat 11.7.0 · c · Asn · AsnToXml · method · since 9.5.0.49`

```c
BOOL CkAsn_AsnToXml(HCkAsn cHandle, HCkString outStr);
const char *CkAsn_asnToXml(HCkAsn cHandle);
```

Converts ASN.1 to XML and returns the XML string.

Returns TRUE for success, FALSE for failure.

### Asn.DeleteSubItem

`Chilkat 11.7.0 · c · Asn · DeleteSubItem · method · since 9.5.0.49`

```c
BOOL CkAsn_DeleteSubItem(HCkAsn cHandle, int index);
```

Discards the Nth sub-item. (The 1st sub-item is at index 0.)

Returns TRUE for success, FALSE for failure.

### Asn.GetEncodedContent

`Chilkat 11.7.0 · c · Asn · GetEncodedContent · method · since 9.5.0.49`

```c
BOOL CkAsn_GetEncodedContent(HCkAsn cHandle, const char *encoding, HCkString outStr);
const char *CkAsn_getEncodedContent(HCkAsn cHandle, const char *encoding);
```

Returns the content of the ASN.1 item in encoded string form. The `encoding` may be any of the following encodings: `Base64`, `Hex`, `Base58`, `modBase64`, `Base32`, `UU`, `QP` (for quoted-printable), `URL` (for url-encoding), `Q`, `B`, `url_oath`, `url_rfc1738`, `url_rfc2396`, and `url_rfc3986`. The `encoding` name is case insensitive (for example, both `Base64` and `base64` are treated the same).

Returns TRUE for success, FALSE for failure.

### Asn.GetEncodedDer

`Chilkat 11.7.0 · c · Asn · GetEncodedDer · method · since 9.5.0.49`

```c
BOOL CkAsn_GetEncodedDer(HCkAsn cHandle, const char *encoding, HCkString outStr);
const char *CkAsn_getEncodedDer(HCkAsn cHandle, const char *encoding);
```

Returns the binary DER in encoded string form. The `encoding` indicates the encoding and can be `base64`, `hex`, `uu`, `quoted-printable`, `base32`, or `modbase64`.

Returns TRUE for success, FALSE for failure.

### Asn.GetLastSubItem

`Chilkat 11.7.0 · c · Asn · GetLastSubItem · method · since 9.5.0.49`

```c
HCkAsn CkAsn_GetLastSubItem(HCkAsn cHandle);
```

Returns the last ASN.1 sub-item. This method can be called immediately after any Append\* method to access the appended item.

Returns `NULL` on failure

### Asn.GetSubItem

`Chilkat 11.7.0 · c · Asn · GetSubItem · method · since 9.5.0.49`

```c
HCkAsn CkAsn_GetSubItem(HCkAsn cHandle, int index);
```

Returns the Nth ASN.1 sub-item. The 1st sub-item is at index 0.

Returns `NULL` on failure

### Asn.LoadAsnXml

`Chilkat 11.7.0 · c · Asn · LoadAsnXml · method · since 9.5.0.49`

```c
BOOL CkAsn_LoadAsnXml(HCkAsn cHandle, const char *xmlStr);
```

Loads ASN.1 from the XML representation (such as that created by the AsnToXml method).

Returns TRUE for success, FALSE for failure.

### Asn.LoadBd

`Chilkat 11.7.0 · c · Asn · LoadBd · method · since 9.5.0.77`

```c
BOOL CkAsn_LoadBd(HCkAsn cHandle, HCkBinData bd);
```

Loads ASN.1 from the binary DER contained in `bd`.

Returns TRUE for success, FALSE for failure.

### Asn.LoadBinaryFile

`Chilkat 11.7.0 · c · Asn · LoadBinaryFile · method · since 9.5.0.49`

```c
BOOL CkAsn_LoadBinaryFile(HCkAsn cHandle, const char *path);
```

Loads ASN.1 from a binary DER file.

Returns TRUE for success, FALSE for failure.

### Asn.LoadEncoded

`Chilkat 11.7.0 · c · Asn · LoadEncoded · method · since 9.5.0.49`

```c
BOOL CkAsn_LoadEncoded(HCkAsn cHandle, const char *asnContent, const char *encoding);
```

Loads ASN.1 from an encoded string. The `encoding` can be `base64`, `hex`, `uu`, `quoted-printable`, `base32`, or `modbase64`.

Returns TRUE for success, FALSE for failure.

### Asn.SetEncodedContent

`Chilkat 11.7.0 · c · Asn · SetEncodedContent · method · since 9.5.0.49`

```c
BOOL CkAsn_SetEncodedContent(HCkAsn cHandle, const char *encodedBytes, const char *encoding);
```

Sets the content of this primitive ASN.1 item. The `encoding` may be any of the following encodings: `Base64`, `Hex`, `Base58`, `modBase64`, `Base32`, `UU`, `QP` (for quoted-printable), `URL` (for url-encoding), `Q`, `B`, `url_oath`, `url_rfc1738`, `url_rfc2396`, and `url_rfc3986`. The `encoding` name is case insensitive (for example, both `Base64` and `base64` are treated the same).

Returns TRUE for success, FALSE for failure.

### Asn.WriteBd

`Chilkat 11.7.0 · c · Asn · WriteBd · method · since 9.5.0.77`

```c
BOOL CkAsn_WriteBd(HCkAsn cHandle, HCkBinData bd);
```

Appends the ASN.1 in binary DER format to `bd`.

Returns TRUE for success, FALSE for failure.

### Asn.WriteBinaryDer

`Chilkat 11.7.0 · c · Asn · WriteBinaryDer · method · since 9.5.0.49`

```c
BOOL CkAsn_WriteBinaryDer(HCkAsn cHandle, const char *path);
```

Writes the ASN.1 in binary DER form to a file.

Returns TRUE for success, FALSE for failure.

## Deprecated members — do not use in new code

| Member | Kind | Deprecated in | Use instead |
|---|---|---|---|
| `GetBinaryDer` | method | before 11.6.1 | — |
| `LoadBinary` | method | before 11.6.1 | — |

## Related classes

[`BinData`](https://www.chilkatsoft.com/ai-docs/v/11.7.0/c/classes/BinData.md)