CkoJsonObject Objective-C Reference Documentation
CkoJsonObject
Current Version: 10.1.0
Represents a JSON object, which contains an unordered set of name/value pairs. Each value can be a string, number, JSON object, JSON array, true, false, or null.
Object Creation
CkoJsonObject *obj = [[CkoJsonObject alloc] init];
Properties
DebugLogFilePath
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:
- a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
- the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
- there is an internal problem (bug) in the Chilkat code that causes the hang.
DelimiterChar
Sets the delimiter char for JSON paths. The default value is ".". To use Firebase style paths, set this property to "/". (This is a string property that should have a length of 1 char.)
topEmitCompact
If YES then the Emit method outputs in the most compact form possible (a single-line with no extra whitespace). If NO, then emits with whitespace and indentation to make the JSON human-readable.
The default value is YES.
topEmitCrLf
If YES then the Emit method uses CRLF line-endings when emitting the non-compact (pretty-print) format. If NO, 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 YES.
topI
The value of the "i" index to be used when evaluating a JSON path.
J
The value of the "j" index to be used when evaluating a JSON path.
topK
The value of the "k" index to be used when evaluating a JSON path.
topLastErrorHtml
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.
topLastErrorText
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.
LastErrorXml
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.
topLastMethodSuccess
Indicate whether the last method call succeeded or failed. A value of YES indicates success, a value of NO 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 = YES and failure = NO.
- 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 YES. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.
topLowerCaseNames
If YES then all member names are converted to lowercase when the JSON is initially loaded by the following methods: Load, LoadBd, LoadSb, LoadFile.
The default value is NO.
topPathPrefix
A prefix string that is automatically added to the JSON path passed in the first argument for other methods (such as StringOf, UpdateString, SetBoolOf, SizeOfArray, etc.)
The default value is the empty string.
topSize
UncommonOptions
This is a catch-all property to be used for uncommon needs. This property defaults to the empty string and should typically remain empty.
topVerboseLogging
If set to YES, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is NO. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.
topVersion
Methods
AddArrayAt
name:(NSString *)name;
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 YES for success, NO for failure.
AddArrayCopyAt
Inserts a copy of a JSON array 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 YES for success, NO for failure.
AddBoolAt
name:(NSString *)name
value:(BOOL)value;
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 YES for success, NO for failure.
AddIntAt
name:(NSString *)name
value:(NSNumber *)value;
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 YES for success, NO for failure.
AddNullAt
name:(NSString *)name;
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 YES for success, NO for failure.
AddNumberAt
name:(NSString *)name
numericStr:(NSString *)numericStr;
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 YES for success, NO for failure.
AddObjectAt
name:(NSString *)name;
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 YES for success, NO for failure.
AddObjectCopyAt
name:(NSString *)name
jsonObj:(CkoJsonObject *)jsonObj;
Inserts a copy of a JSON object 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 YES for success, NO for failure.
AddStringAt
name:(NSString *)name
value:(NSString *)value;
Inserts a new string 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 YES for success, NO for failure.
AppendArray
Appends a new and empty JSON array and returns it.
Important: The name is the member name, it is not a JSON path.
Returns nil on failure
AppendArrayCopy
Appends a copy of a JSON array.
Important: The name is the member name, it is not a JSON path.
Returns YES for success, NO for failure.
AppendBool
value:(BOOL)value;
Appends a new boolean member. (This is the same as passing -1 to the AddBoolAt method.)
Important: The name is the member name. It is not a JSON path. To append (or update) using a JSON path, call UpdateBool instead.
Returns YES for success, NO for failure.
topAppendInt
value:(NSNumber *)value;
Appends a new integer member. (This is the same as passing an index of -1 to the AddIntAt method.)
Important: The name is the member name. It is not a JSON path. To append (or update) using a JSON path, call UpdateInt instead.
Returns YES for success, NO for failure.
topAppendObject
Appends a new and empty JSON object and returns it.
Important: The name is the member name, it is not a JSON path.
Returns nil on failure
AppendObjectCopy
jsonObj:(CkoJsonObject *)jsonObj;
Appends a copy of a JSON object.
Important: The name is the member name, it is not a JSON path.
Returns YES for success, NO for failure.
AppendString
value:(NSString *)value;
Appends a new string member. (This is the same as passing -1 to the AddStringAt method.)
Important: The name is the member name. It is not a JSON path. To append (or update) using a JSON path, call UpdateString instead.
Returns YES for success, NO for failure.
topAppendStringArray
Appends an array of string values.
Important: The name is the member name, it is not a JSON path.
Returns YES for success, NO for failure.
ArrayAt
Returns the JSON array that is the value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns nil on failure
ArrayOf
Returns the JSON array at the specified jsonPath.
Returns nil on failure
BoolAt
Returns the boolean value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
BoolOf
BytesOf
Appends the binary bytes at the specified jsonPath to bd. The encoding indicates the encoding of the bytes, such as "base64", "hex", etc.
Returns YES for success, NO for failure.
Clear
Clears the contents of the JSON object. This is the equivalent of calling jsonObject.Load("{}")
topClone
DateOf
Fills the dateTime with the date/time string located at jsonPath. 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 YES for success, NO for failure.
Delete
Deletes the member at having the name specified by name. Note: The name is not a tag path. It is the name of a member of this JSON object.
Returns YES for success, NO for failure.
DeleteAt
Deletes the member at index index. Indexing is 0-based (the 1st member is at index 0).
Returns YES for success, NO for failure.
DeleteRecords
relpath:(NSString *)relpath
value:(NSString *)value
caseSensitive:(BOOL)caseSensitive;
Deletes JSON records in an array where a particular field equals or matches a value pattern. Returns the number of JSON records deleted.
topDtOf
Fills the dt with the date/time string located at jsonPath. If bLocal is YES, then dt is filled with the local date/time values, otherwise it is filled with the UTC/GMT values. 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 YES for success, NO for failure.
Emit
Writes the JSON document (rooted at the caller) and returns as a string.
Returns nil on failure
EmitBd
EmitSb
EmitWithSubs
Emits the JSON document with variable substitutions applied. If omitEmpty is YES, then members having empty strings or empty arrays are omitted.
Returns nil on failure
FindObjectWithMember
Recursively searches the JSON subtree rooted at the caller's node for a JSON object containing a member having a specified name. (If the caller is the root node of the entire JSON document, then the entire JSON document is searched.) Returns the first match or nil if not found.
Returns nil on failure
topFindRecord
relPath:(NSString *)relPath
value:(NSString *)value
caseSensitive:(BOOL)caseSensitive;
Finds a JSON record in an array where a particular field equals or matches a value pattern. Reviewing the example below is the best way to understand this function.
Returns nil on failure
FindRecordString
relPath:(NSString *)relPath
value:(NSString *)value
caseSensitive:(BOOL)caseSensitive
retRelPath:(NSString *)retRelPath;
Finds a JSON value in an record array where a particular field equals or matches a value pattern. Reviewing the example below is the best way to understand this function.
Returns nil on failure
FirebaseApplyEvent
data:(NSString *)data;
Applies a Firebase event to the JSON. The data contains JSON having a format such as
{"path": "/", "data": {"a": 1, "b": 2}}
The name should be "put" or "patch".Returns YES for success, NO for failure.
FirebasePatch
jsonData:(NSString *)jsonData;
For each key in the jsonData, update (or add) the corresponding key in the JSON at the given jsonPath. The jsonPath is relative to this JSON object. (This is effectively applying a Firebase patch event.)
Returns YES for success, NO for failure.
FirebasePut
value:(NSString *)value;
Inserts or replaces the value at the jsonPath. The value can contain JSON text, an integer (in decimal string format), a boolean (true/false), the keyword "null", or a quoted string.
The jsonPath is relative to this JSON object. (This is effectively applying a Firebase put event.)
Returns YES for success, NO for failure.
GetDocRoot
Returns the root of the JSON document. The root can be obtained from any JSON object within the JSON document. The entire JSON document remains in memory as long as at least one JSON object is referenced by the application. When the last reference is removed, the entire JSON document is automatically dellocated.
Returns nil on failure
HasMember
IndexOf
Returns the index of the member having the given name. Returns -1 if the name is not found.
IntAt
Returns the integer value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
IntOf
IsNullAt
Returns the boolean value of the member having the specified index.
IsNullOf
Returns YES if the value at the specified jsonPath is null. Otherwise returns NO.
JsonTypeOf
Returns the type of data at the given jsonPath. Possible return values are:
- 1 - string
- 2- number
- 3- object
- 4- array
- 5- boolean
- 6- null
Load
Parses a JSON string and loads it into this JSON object to provide DOM-style access.
Returns YES for success, NO for failure.
LoadBd
LoadFile
Loads a JSON file into this JSON object. The path is the file path to the JSON file.
Returns YES for success, NO for failure.
LoadPredefined
Loads this JSON object from a predefined document having a specified name.
Returns YES for success, NO for failure.
LoadSb
Loads JSON from the contents of a StringBuilder object.
Returns YES for success, NO for failure.
MoveMember
toIndex:(NSNumber *)toIndex;
Move the member from fromIndex to toIndex. If toIndex equals -1, then moves the member at position fromIndex to the last position. Set toIndex = 0 to move a member to the first position.
Returns YES for success, NO for failure.
topNameAt
Returns the name of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns nil on failure
ObjectAt
Returns the JSON object that is the value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns nil on failure
ObjectOf
Returns the JSON object at the specified jsonPath.
Returns nil on failure
Predefine
Adds or replaces this JSON to an internal global set of predefined JSON documents that can be subsequently loaded by name.
Returns YES for success, NO for failure.
Rename
newName:(NSString *)newName;
Renames the member named oldName to newName.
Returns YES for success, NO for failure.
RenameAt
name:(NSString *)name;
Renames the member at index to name.
Returns YES for success, NO for failure.
SetBoolAt
value:(BOOL)value;
Sets the boolean value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns YES for success, NO for failure.
SetBoolOf
value:(BOOL)value;
Sets the boolean value at the specified jsonPath.
Returns YES for success, NO for failure.
SetIntAt
value:(NSNumber *)value;
Sets the integer value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns YES for success, NO for failure.
SetIntOf
value:(NSNumber *)value;
Sets the integer at the specified jsonPath.
Returns YES for success, NO for failure.
SetNullAt
Sets the value of the Nth member to null. Indexing is 0-based (the 1st member is at index 0).
Returns YES for success, NO for failure.
SetNullOf
Sets the value at the specified jsonPath to null.
Returns YES for success, NO for failure.
SetNumberAt
value:(NSString *)value;
Sets the numeric value of the Nth member. 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 YES for success, NO for failure.
SetNumberOf
value:(NSString *)value;
Sets the numeric value at the specified jsonPath. The value is an integer, float, or double already converted to a string in the format desired by the application.
Returns YES for success, NO for failure.
SetStringAt
value:(NSString *)value;
Sets the string value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns YES for success, NO for failure.
SetStringOf
value:(NSString *)value;
Sets the string value at the specified jsonPath.
Returns YES for success, NO for failure.
SizeOfArray
Returns the size of the array at the given jsonPath. Returns -1 if the jsonPath does not evaluate to an existent JSON array.
Sort
caseSensitive:(BOOL)caseSensitive;
StringAt
Returns the string value of the Nth member. Indexing is 0-based (the 1st member is at index 0).
Returns nil on failure
StringOf
Returns the string value at the specified jsonPath.
Returns nil on failure
StringOfEquals
value:(NSString *)value
caseSensitive:(BOOL)caseSensitive;
Returns YES if the string value at the specified jsonPath equals value. Otherwise returns NO
topStringOfSb
Appends the string value at the specified jsonPath to sb.
Returns YES for success, NO for failure.
topSwap
index2:(NSNumber *)index2;
Swaps the positions of members at index1 and index2.
Returns YES for success, NO for failure.
TypeAt
Returns the type of data at the given index. Possible return values are:
- string
- number
- object
- array
- boolean
- null
UIntOf
Returns the unsigned integer at the specified jsonPath.
topUpdateBd
Updates or appends a new string member with the encoded contents of bd. If the full path specified by jsonPath does not exist, it is automatically created as needed. The bytes contained in bd are encoded according to encoding (such as "base64", "hex", etc.)
Returns YES for success, NO for failure.
UpdateBool
value:(BOOL)value;
Updates or appends a new boolean member. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
topUpdateInt
value:(NSNumber *)value;
Updates or appends a new integer member. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
UpdateNewArray
Updates or appends a new and empty array at the jsonPath. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
UpdateNewObject
Updates or appends a new and empty JSON object at the jsonPath. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
UpdateNull
Updates or appends a null member. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
topUpdateNumber
numericStr:(NSString *)numericStr;
Updates or appends a new numeric member. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
UpdateSb
Updates or appends a new string member with the contents of sb. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
topUpdateString
value:(NSString *)value;
Updates or appends a new string member. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Important: Prior to version 9.5.0.68, the string passed in to this method did not get properly JSON escaped. This could cause problems if non-us-ascii chars are present, or if certain special chars such as quotes, CR's, or LF's are present. Version 9.5.0.68 fixes the problem.
Returns YES for success, NO for failure.
UpdateUInt
value:(NSNumber *)value;
Updates or appends a new unsigned integer member. If the full path specified by jsonPath does not exist, it is automatically created as needed.
Returns YES for success, NO for failure.
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