JsonArray DataFlex Reference Documentation

JsonArray

Current Version: 9.5.0.75

Represents a JSON array, which contains an ordered list of JSON values, where each value can be a string, number, JSON object, JSON array, true, false, or null.

Object Creation

// (Dataflex programs use the 32-bit Chilkat ActiveX)
Handle hoJsonArray
Get Create(RefClass(cComChilkatJsonArray)) to hoJsonArray

Properties

DebugLogFilePath
Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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EmitCompact
Function ComEmitCompact Returns Boolean
Procedure Set ComEmitCompact Boolean value
Introduced in version 9.5.0.64

If True then the Emit method outputs in the most compact form possible (a single-line with no extra whitespace). If False, then emits with whitespace and indentation to make the JSON human-readable.

The default value is True.

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EmitCrlf
Function ComEmitCrlf Returns Boolean
Procedure Set ComEmitCrlf Boolean value
Introduced in version 9.5.0.64

If True then the Emit method uses CRLF line-endings when emitting the non-compact (pretty-print) format. If False, then bare-LF's are emitted. (The compact format emits to a single line with no end-of-line characters.) Windows systems traditionally use CRLF line-endings, whereas Linux, Mac OS X, and other systems traditionally use bare-LF line-endings.

The default value is True.

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LastBinaryResult
Function ComLastBinaryResult Returns Variant
Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to True. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

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LastErrorHtml
Function ComLastErrorHtml Returns String

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorText
Function ComLastErrorText Returns String

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorXml
Function ComLastErrorXml Returns String

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastMethodSuccess
Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = True and failure = False.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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LastStringResult
Function ComLastStringResult Returns String
Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to True. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

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LastStringResultLen
Function ComLastStringResultLen Returns Integer
Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

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Size
Function ComSize Returns Integer
Introduced in version 9.5.0.56

The number of JSON values in the array.

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VerboseLogging
Function ComVerboseLogging Returns Boolean
Procedure Set ComVerboseLogging Boolean value

If set to True, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is False. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Function ComVersion Returns String

Version of the component/library, such as "9.5.0.63"

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Methods

AddArrayAt
Function ComAddArrayAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Inserts a new and empty JSON array member to the position indicated by index. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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AddBoolAt
Function ComAddBoolAt Integer index Boolean value Returns Boolean
Introduced in version 9.5.0.56

Inserts a new boolean member to the position indicated by index. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

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AddIntAt
Function ComAddIntAt Integer index Integer value Returns Boolean
Introduced in version 9.5.0.56

Inserts a new integer member to the position indicated by index. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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AddNullAt
Function ComAddNullAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Inserts a new null member to the position indicated by index. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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AddNumberAt
Function ComAddNumberAt Integer index String numericStr Returns Boolean
Introduced in version 9.5.0.56

Inserts a new numeric member to the position indicated by index. The numericStr is an integer, float, or double already converted to a string in the format desired by the application. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

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AddObjectAt
Function ComAddObjectAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Inserts a new and empty JSON object member to the position indicated by index. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

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AddStringAt
Function ComAddStringAt Integer index String value Returns Boolean
Introduced in version 9.5.0.56

Inserts a new string at the position indicated by index. To prepend, pass an index of 0. To append, pass an index of -1. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

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ArrayAt
Function ComArrayAt Integer index Returns cComChilkatJsonArray
Introduced in version 9.5.0.56

Returns the JSON array that is the value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

Returns null on failure

More Information and Examples
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BoolAt
Function ComBoolAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Returns the boolean value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

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Clear
Procedure ComClear
Introduced in version 9.5.0.76

Deletes all array elements.

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DateAt
Function ComDateAt Integer index cComCkDateTime dateTime Returns Boolean
Introduced in version 9.5.0.73

Fills the dateTime with the date/time string located in the Nth array element. Indexing is 0-based (the 1st member is at index 0). Auto-recognizes the following date/time string formats: ISO-8061 Timestamp (such as "2009-11-04T19:55:41Z"), RFC822 date/time format (such as "Wed, 18 Apr 2018 15:51:55 -0400"), or Unix timestamp integers.

Returns True for success, False for failure.

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DeleteAt
Function ComDeleteAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Deletes the array element at the given index. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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DtAt
Function ComDtAt Integer index Boolean bLocal cComDtObj dt Returns Boolean
Introduced in version 9.5.0.73

Fills the dt with the date/time string located in the Nth array element. If bLocal is True, then dt is filled with the local date/time values, otherwise it is filled with the UTC/GMT values. Indexing is 0-based (the 1st member is at index 0). Auto-recognizes the following date/time string formats: ISO-8061 Timestamp (such as "2009-11-04T19:55:41Z"), RFC822 date/time format (such as "Wed, 18 Apr 2018 15:51:55 -0400"), or Unix timestamp integers.

Returns True for success, False for failure.

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Emit
Function ComEmit Returns String
Introduced in version 9.5.0.58

Writes the JSON array (rooted at the caller) and returns as a string.

Note: To control the compact/non-compact format, and to control the LF/CRLF line-endings, set the EmitCompact and EmitCrlf properties.

Returns null on failure

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EmitSb
Function ComEmitSb cComChilkatStringBuilder sb Returns Boolean
Introduced in version 9.5.0.65

Writes the JSON array to the sb.

Note: To control the compact/non-compact format, and to control the LF/CRLF line-endings, set the EmitCompact and EmitCrlf properties.

Returns True for success, False for failure.

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FindObject
Function ComFindObject String name String value Boolean caseSensitive Returns Integer
Introduced in version 9.5.0.73

Return the index of the first object in the array where value of the field at name matches value. name is an object member name. The value is a value pattern which can use "*" chars to indicate zero or more of any char. If caseSensitive is False, then the matching is case insenstive, otherwise it is case sensitive. Returns -1 if no matching string was found.

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FindString
Function ComFindString String value Boolean caseSensitive Returns Integer
Introduced in version 9.5.0.73

Return the index of the first matching string in the array. The value is a value pattern which can use "*" chars to indicate zero or more of any char. If caseSensitive is False, then the matching is case insenstive, otherwise it is case sensitive. Returns -1 if no matching string was found.

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IntAt
Function ComIntAt Integer index Returns Integer
Introduced in version 9.5.0.56

Returns the integer value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

More Information and Examples
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IsNullAt
Function ComIsNullAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Returns the True if the Nth array element is null, otherwise returns False. Indexing is 0-based (the 1st member is at index 0).

More Information and Examples
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Load
Function ComLoad String jsonArray Returns Boolean
Introduced in version 9.5.0.64

Loads a JSON array from a string. A JSON array must begin with a "[" and end with a "]".

Note: The Load method causes the JsonArray to detach and become it's own JSON document. It should only be called on new instances of the JsonArray. See the example below.

Returns True for success, False for failure.

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LoadSb
Function ComLoadSb cComChilkatStringBuilder sb Returns Boolean
Introduced in version 9.5.0.64

Loads a JSON array from a StringBuilder. A JSON array must begin with a "[" and end with a "]".

Note: The Load method causes the JsonArray to detach and become it's own JSON document. It should only be called on new instances of the JsonArray. See the example below.

Returns True for success, False for failure.

More Information and Examples
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ObjectAt
Function ComObjectAt Integer index Returns cComChilkatJsonObject
Introduced in version 9.5.0.56

Returns the JSON object that is the value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

Returns null on failure

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SetBoolAt
Function ComSetBoolAt Integer index Boolean value Returns Boolean
Introduced in version 9.5.0.56

Sets the boolean value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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SetIntAt
Function ComSetIntAt Integer index Integer value Returns Boolean
Introduced in version 9.5.0.56

Sets the integer value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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SetNullAt
Function ComSetNullAt Integer index Returns Boolean
Introduced in version 9.5.0.56

Sets the Nth array element to the value of null. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

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SetNumberAt
Function ComSetNumberAt Integer index String value Returns Boolean
Introduced in version 9.5.0.56

Sets the numeric value of the Nth array element. The value is an integer, float, or double already converted to a string in the format desired by the application. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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SetStringAt
Function ComSetStringAt Integer index String value Returns Boolean
Introduced in version 9.5.0.56

Sets the string value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

Returns True for success, False for failure.

More Information and Examples
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StringAt
Function ComStringAt Integer index Returns String
Introduced in version 9.5.0.56

Returns the string value of the Nth array element. Indexing is 0-based (the 1st member is at index 0).

Returns null on failure

More Information and Examples
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Swap
Function ComSwap Integer index1 Integer index2 Returns Boolean
Introduced in version 9.5.0.76

Swaps the items at positions index1 and index2.

Returns True for success, False for failure.

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TypeAt
Function ComTypeAt Integer index Returns Integer
Introduced in version 9.5.0.58

Returns the type of data at the given index. Possible return values are:

  1. string
  2. number
  3. object
  4. array
  5. boolean
  6. null
Returns -1 if no member exists at the given index.

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