Xmp Delphi DLL Reference Documentation

Xmp

Current Version: 9.5.0.73

Chilkat XMP is a software component (SDK, toolkit, library, etc) for accessing, manipulating, and adding XMP metadata to JPEG and TIFF files.

Create/Dispose

var
myObject: HCkXmp;

begin
myObject := CkXmp_Create();

// ...

CkXmp_Dispose(myObject);
end;
function CkXmp_Create: HCkXmp; stdcall;

Creates an instance of the HCkXmp object and returns a handle (i.e. a Pointer). The handle is passed in the 1st argument for the functions listed on this page.

procedure CkXmp_Dispose(handle: HCkXmp); stdcall;

Objects created by calling CkXmp_Create must be freed by calling this method. A memory leak occurs if a handle is not disposed by calling this function.

Properties

DebugLogFilePath
procedure CkXmp_getDebugLogFilePath(objHandle: HCkXmp; outPropVal: HCkString); stdcall;
procedure CkXmp_putDebugLogFilePath(objHandle: HCkXmp; newPropVal: PWideChar); stdcall;
function CkXmp__debugLogFilePath(objHandle: HCkXmp): PWideChar; stdcall;

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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LastErrorHtml
procedure CkXmp_getLastErrorHtml(objHandle: HCkXmp; outPropVal: HCkString); stdcall;
function CkXmp__lastErrorHtml(objHandle: HCkXmp): PWideChar; stdcall;

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
procedure CkXmp_getLastErrorText(objHandle: HCkXmp; outPropVal: HCkString); stdcall;
function CkXmp__lastErrorText(objHandle: HCkXmp): PWideChar; stdcall;

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
procedure CkXmp_getLastErrorXml(objHandle: HCkXmp; outPropVal: HCkString); stdcall;
function CkXmp__lastErrorXml(objHandle: HCkXmp): PWideChar; stdcall;

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 CkXmp_getLastMethodSuccess(objHandle: HCkXmp): wordbool; stdcall;
procedure CkXmp_putLastMethodSuccess(objHandle: HCkXmp; newPropVal: wordbool); stdcall;
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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NumEmbedded
function CkXmp_getNumEmbedded(objHandle: HCkXmp): Integer; stdcall;

The number of XMP metadata documents found within the JPG or TIFF file loaded by LoadAppFile.

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StructInnerDescrip
function CkXmp_getStructInnerDescrip(objHandle: HCkXmp): wordbool; stdcall;
procedure CkXmp_putStructInnerDescrip(objHandle: HCkXmp; newPropVal: wordbool); stdcall;

Determines whether structures are stored with rdf:parseType="Resource", or within an "rdf:Description" sub-node.

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VerboseLogging
function CkXmp_getVerboseLogging(objHandle: HCkXmp): wordbool; stdcall;
procedure CkXmp_putVerboseLogging(objHandle: HCkXmp; newPropVal: wordbool); stdcall;

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
procedure CkXmp_getVersion(objHandle: HCkXmp; outPropVal: HCkString); stdcall;
function CkXmp__version(objHandle: HCkXmp): PWideChar; stdcall;

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

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Methods

AddArray
function CkXmp_AddArray(objHandle: HCkXmp;
    xml: HCkXml;
    arrType: PWideChar;
    propName: PWideChar;
    values: HCkStringArray): wordbool; stdcall;

Adds or replaces an XMP property array. The XMP metadata to be updated is contained in the XML object passed in the 1st argument. The 2nd argument specifies the array type, which can be "bag", "seq", or "alt". The property name should be prefixed with the namespace, such as "dc:subject".

More Information and Examples
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AddNsMapping
procedure CkXmp_AddNsMapping(objHandle: HCkXmp;
    ns: PWideChar;
    uri: PWideChar) stdcall;

Adds a namespace to URI mapping. When a property is added via AddSimpleString or any of the other methods, the property name is namespace qualified. When adding the first property in a namespace, the rdf:Description is automatically added and the URI is obtained from the namespace-to-URI mappings. The standard (and commonly used) namespace mappings are defined by default. This is only used if the namespace is custom or not already handled.

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AddSimpleInt
function CkXmp_AddSimpleInt(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar;
    propVal: Integer): wordbool; stdcall;

Adds or updates an XMP integer property. The XMP metadata to be updated is contained in the XML object passed in the 1st argument. The property name should be prefixed with the namespace, such as "tiff:XResolution".

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AddSimpleStr
function CkXmp_AddSimpleStr(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar;
    propVal: PWideChar): wordbool; stdcall;

Adds or updates a simple XMP string property. The XMP metadata to be updated is contained in the XML object passed in the 1st argument. The property name should be prefixed with the namespace, such as "photoshop:Credit".

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AddStructProp
function CkXmp_AddStructProp(objHandle: HCkXmp;
    iChilkatXml: HCkXml;
    structName: PWideChar;
    propName: PWideChar;
    propValue: PWideChar): wordbool; stdcall;

Adds or updates an XMP structured property value. The XMP metadata to be updated is contained in the XML object passed in the 1st argument. The structure name should be prefixed with the namespace, such as "Iptc4xmpCore:CreatorContactInfo". The property name within the structure should also be prefixed with the namespace, such as "Iptc4xmpCore:CiAdrCity".

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Append
function CkXmp_Append(objHandle: HCkXmp;
    iXml: HCkXml): wordbool; stdcall;

Appends a new XMP metadata file to the XMP object. Any XMPs appended via this method will be present in the file when SaveAppFile is called. Files containing XMP metadata typically only include a single XMP document, so this method is usually only called when adding XMP metadata to a file for the first time.

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GetArray
function CkXmp_GetArray(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar): HCkStringArray; stdcall;

Finds and returns an XMP array property. The property name should be prefixed with the namespace, such as "dc:subject".

Returns nil on failure

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GetEmbedded
function CkXmp_GetEmbedded(objHandle: HCkXmp;
    index: Integer): HCkXml; stdcall;

Returns the Nth embedded XMP document as a Chilkat XML object.

Returns nil on failure

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GetProperty
function CkXmp_GetProperty(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar): HCkXml; stdcall;

To be documented soon...

Returns nil on failure

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GetSimpleInt
function CkXmp_GetSimpleInt(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar): Integer; stdcall;

Finds and returns an XMP integer property. The property name should be prefixed with the namespace, such as "tiff:ResolutionUnit".

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GetSimpleStr
function CkXmp_GetSimpleStr(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar;
    outStr: HCkString): wordbool; stdcall;
function CkXmp__getSimpleStr(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar): PWideChar; stdcall;

Finds and returns an XMP simple string property. The property name should be prefixed with the namespace, such as "photoshop:Source".

Returns True for success, False for failure.

More Information and Examples
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GetStructPropNames
function CkXmp_GetStructPropNames(objHandle: HCkXmp;
    iXml: HCkXml;
    structName: PWideChar): HCkStringArray; stdcall;

Returns the property names used by an exsting structure within an XMP document. The contents of the structure can be retrieved by calling GetStructValue for each property name returned by GetStructPropNames.

Returns nil on failure

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GetStructValue
function CkXmp_GetStructValue(objHandle: HCkXmp;
    iXml: HCkXml;
    structName: PWideChar;
    propName: PWideChar;
    outStr: HCkString): wordbool; stdcall;
function CkXmp__getStructValue(objHandle: HCkXmp;
    iXml: HCkXml;
    structName: PWideChar;
    propName: PWideChar): PWideChar; stdcall;

Returns the value of a single item within an XMP structure property. Property names should always be prefixed with the namespace.

Returns True for success, False for failure.

More Information and Examples
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LoadAppFile
function CkXmp_LoadAppFile(objHandle: HCkXmp;
    filename: PWideChar): wordbool; stdcall;

Loads a TIFF or JPG file into the XMP object.

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LoadFromBuffer
function CkXmp_LoadFromBuffer(objHandle: HCkXmp;
    fileData: HCkByteData;
    ext: PWideChar): wordbool; stdcall;

Loads a JPG or TIFF from an byte buffer containing the image file data.

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NewXmp
function CkXmp_NewXmp(objHandle: HCkXmp): HCkXml; stdcall;

Creates and returns a new/empty XMP metadata document as a Chilkat XML object.

Returns nil on failure

More Information and Examples
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RemoveAllEmbedded
function CkXmp_RemoveAllEmbedded(objHandle: HCkXmp): wordbool; stdcall;

Removes all XMP metadata documents from an XMP object. After calling this method, call SaveAppFile to rewrite the JPG or TIFF file with the XMP metadata removed.

Returns True for success, False for failure.

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RemoveArray
function CkXmp_RemoveArray(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar): wordbool; stdcall;

Removes an XMP array property from the XMP document.

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RemoveEmbedded
function CkXmp_RemoveEmbedded(objHandle: HCkXmp;
    index: Integer): wordbool; stdcall;

Removes a single XMP metadata document from the JPG or TIFF file. Call SaveAppFile to persist the changes to disk.

Returns True for success, False for failure.

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RemoveNsMapping
procedure CkXmp_RemoveNsMapping(objHandle: HCkXmp;
    ns: PWideChar) stdcall;

Removes a namespace-to-URI mapping.

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RemoveSimple
function CkXmp_RemoveSimple(objHandle: HCkXmp;
    iXml: HCkXml;
    propName: PWideChar): wordbool; stdcall;

Removes a simple XMP property from the XMP document.

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RemoveStruct
function CkXmp_RemoveStruct(objHandle: HCkXmp;
    iXml: HCkXml;
    structName: PWideChar): wordbool; stdcall;

Removes an XMP structure property from the XMP document.

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RemoveStructProp
function CkXmp_RemoveStructProp(objHandle: HCkXmp;
    iXml: HCkXml;
    structName: PWideChar;
    propName: PWideChar): wordbool; stdcall;

Removes a single member from an XMP structured property.

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SaveAppFile
function CkXmp_SaveAppFile(objHandle: HCkXmp;
    filename: PWideChar): wordbool; stdcall;

Persists all changes made to the XMP document(s) by saving the XMP object to a file. Changes made by adding, updating, or removing properties are not persisted to the filesystem until this is called.

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SaveLastError
function CkXmp_SaveLastError(objHandle: HCkXmp;
    path: PWideChar): wordbool; stdcall;

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns True for success, False for failure.

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SaveToBuffer
function CkXmp_SaveToBuffer(objHandle: HCkXmp;
    outBytes: HCkByteData): wordbool; stdcall;

Saves a JPG or TIFF image with updated XMP to a byte buffer.

Returns True for success, False for failure.

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UnlockComponent
function CkXmp_UnlockComponent(objHandle: HCkXmp;
    unlockCode: PWideChar): wordbool; stdcall;

Unlocks the XMP component at runtime. This must be called once at the beginning of your application. Passing an arbitrary value initiates a fully-functional 30-day trial. A purchased unlock code is required to use the component beyond 30 days.

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