Xmp ActiveX 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.

Object Creation

(Visual Basic 6.0)
Dim obj As New ChilkatXmp

(ASP)
set obj = Server.CreateObject("Chilkat_9_5_0.Xmp")

(VBScript)
set obj = CreateObject("Chilkat_9_5_0.Xmp")

(Delphi)
obj := TChilkatXmp.Create(Self);

(FoxPro)
loObject = CreateObject('Chilkat_9_5_0.Xmp')

(PowerBuilder)
lole_object = create oleobject
li_rc = lole_object.ConnectToNewObject("Chilkat_9_5_0.Xmp")

(SQL Server)
EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Xmp', @obj OUT

(Javascript)
var obj = new ActiveXObject("Chilkat_9_5_0.Xmp");

Properties

DebugLogFilePath
DebugLogFilePath As String

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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LastBinaryResult
LastBinaryResult As Variant (read-only)
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 1. 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
LastErrorHtml As String (read-only)

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
LastErrorText As String (read-only)

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
LastErrorXml As String (read-only)

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
LastMethodSuccess As Long
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of 1 indicates success, a value of 0 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 = 1 and failure = 0.
  • 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 1. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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LastStringResult
LastStringResult As String (read-only)
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 1. 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
LastStringResultLen As Long (read-only)
Introduced in version 9.5.0.53

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

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NumEmbedded
NumEmbedded As Long (read-only)

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

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StructInnerDescrip
StructInnerDescrip As Long

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

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VerboseLogging
VerboseLogging As Long

If set to 1, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is 0. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Version As String (read-only)

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

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Methods

AddArray
AddArray(xml As ChilkatXml, arrType As String, propName As String, values As CkStringArray) As Long

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".

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AddNsMapping
AddNsMapping(ns As String, uri As String)

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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AddSimpleDate
AddSimpleDate(iXml As ChilkatXml, propName As String, ByVal propVal As Date) As Long
This method is deprecated. It will be removed in a future version.

Adds or replaces an XMP date 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 "xap:CreateDate".

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AddSimpleInt
AddSimpleInt(iXml As ChilkatXml, propName As String, ByVal propVal As Long) As Long

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
AddSimpleStr(iXml As ChilkatXml, propName As String, propVal As String) As Long

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
AddStructProp(iChilkatXml As ChilkatXml, structName As String, propName As String, propValue As String) As Long

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
Append(iXml As ChilkatXml) As Long

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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DateToString
DateToString(ByVal d As Date) As String
This method is deprecated. It will be removed in a future version.

Converts a date to a string representation. This method is added for convenience (just in case date-to-string conversions are required).

Returns Nothing on failure

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GetArray
GetArray(iXml As ChilkatXml, propName As String) As CkStringArray

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

Returns Nothing on failure

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GetEmbedded
GetEmbedded(ByVal index As Long) As ChilkatXml

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

Returns Nothing on failure

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GetProperty
GetProperty(iXml As ChilkatXml, propName As String) As ChilkatXml

To be documented soon...

Returns Nothing on failure

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GetSimpleDate
GetSimpleDate(iXml As ChilkatXml, propName As String) As Date
This method is deprecated. It will be removed in a future version.

Finds and returns an XMP date property. The property name should be prefixed with the namespace, such as "xap:ModifyDate".

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GetSimpleInt
GetSimpleInt(iXml As ChilkatXml, propName As String) As Long

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
GetSimpleStr(iXml As ChilkatXml, propName As String) As String

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

Returns Nothing on failure

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GetStructPropNames
GetStructPropNames(iXml As ChilkatXml, structName As String) As CkStringArray

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 Nothing on failure

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GetStructValue
GetStructValue(iXml As ChilkatXml, structName As String, propName As String) As String

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

Returns Nothing on failure

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LoadAppFile
LoadAppFile(filename As String) As Long

Loads a TIFF or JPG file into the XMP object.

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LoadFromBuffer
LoadFromBuffer(fileData As Variant, ext As String) As Long

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

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NewXmp
NewXmp() As ChilkatXml

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

Returns Nothing on failure

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RemoveAllEmbedded
RemoveAllEmbedded() As Long

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 1 for success, 0 for failure.

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RemoveArray
RemoveArray(iXml As ChilkatXml, propName As String) As Long

Removes an XMP array property from the XMP document.

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RemoveEmbedded
RemoveEmbedded(ByVal index As Long) As Long

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

Returns 1 for success, 0 for failure.

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RemoveNsMapping
RemoveNsMapping(ns As String)

Removes a namespace-to-URI mapping.

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RemoveSimple
RemoveSimple(iXml As ChilkatXml, propName As String) As Long

Removes a simple XMP property from the XMP document.

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RemoveStruct
RemoveStruct(iXml As ChilkatXml, structName As String) As Long

Removes an XMP structure property from the XMP document.

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RemoveStructProp
RemoveStructProp(iXml As ChilkatXml, structName As String, propName As String) As Long

Removes a single member from an XMP structured property.

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SaveAppFile
SaveAppFile(filename As String) As Long

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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SaveToBuffer
SaveToBuffer() As Variant

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

Returns a zero-length byte array (as a Variant) on failure.
An empty array will have a UBound of -1 meaning 0 elements.

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StringToDate
StringToDate(str As String) As Date
This method is deprecated. It will be removed in a future version.

Converts a string to a date value. This method is added for convenience (just in case string-to-date conversions are required).

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UnlockComponent
UnlockComponent(unlockCode As String) As Long

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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