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UpdateResource info  Overview  Group

The UpdateResource function adds, deletes, or replaces a resource in an executable file.

BOOL UpdateResource(

    HANDLE hUpdate,

// update-file handle

    LPCTSTR lpType,

// address of resource type to update

    LPCTSTR lpName,

// address of resource name to update

    WORD wLanguage,

// language identifier of resource

    LPVOID lpData,

// address of resource data

    DWORD cbData 

// length of resource data, in bytes



Specifies an update-file handle. This handle is returned by the BeginUpdateResource function.
Points to a null-terminated string specifying the resource type to be updated. This parameter can also be an integer value passed to the MAKEINTRESOURCE macro, or it can be one of the following predefined resource types:




Accelerator table


Animated cursor


Animated icon


Bitmap resource


Hardware-dependent cursor resource


Dialog box


Font resource


Font directory resource


Hardware-independent cursor resource


Hardware-independent icon resource


Hardware-dependent icon resource


Menu resource


Message-table entry


Application-defined resource (raw data)


String-table entry


Version resource

Points to a null-terminated string specifying the name of the resource to be updated. This parameter can also be an integer value passed to the MAKEINTRESOURCE macro.
Specifies the language identifier of the resource to be updated. For a list of the primary language identifiers and sublanguage identifiers that make up a language identifier, see the MAKELANGID macro
Points to the resource data to be inserted into the executable file. If the resource is one of the predefined types, the data must be valid and properly aligned. Note that this is the raw binary data stored in the executable file, not the data provided by LoadIcon, LoadString, or other resource-specific load functions. All data containing strings or text must be in Unicode format; lpData must not point to ANSI data.

If lpData is NULL, the specified resource is deleted from the executable file.

Specifies the size, in bytes, of the resource data at lpData.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


An application can use UpdateResource repeatedly to make changes to the resource data. Each call to UpdateResource contributes to an internal list of additions, deletions, and replacements but does not actually write the data to the executable file. The application must use the EndUpdateResource function to write the accumulated changes to the executable file.

See Also

BeginUpdateResource, EndUpdateResource, LoadIcon, LoadString, LockResource, MAKEINTRESOURCE, MAKELANGID, SizeofResource

See also:

file: /Techref/os/win/api/win32/func/src/f90.htm, 8KB, , updated: 2000/4/7 12:19, local time: 2022/5/17 06:48,

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