CreateActCtxA function (winbase.h)

The CreateActCtx function creates an activation context.


HANDLE CreateActCtxA(
  [in, out] PCACTCTXA pActCtx


[in, out] pActCtx

Pointer to an ACTCTX structure that contains information about the activation context to be created.

Return value

If the function succeeds, it returns a handle to the returned activation context. Otherwise, it returns INVALID_HANDLE_VALUE.

This function sets errors that can be retrieved by calling GetLastError. For an example, see Retrieving the Last-Error Code. For a complete list of error codes, see System Error Codes.


Set any undefined bits in dwFlags of ACTCTX to 0. If any undefined bits are not set to 0, the call to CreateActCtx that creates the activation context fails and returns an invalid parameter error code. The handle returned from CreateActCtx is passed in a call to ActivateActCtx to activate the context for the current thread.


The winbase.h header defines CreateActCtx as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.


Requirement Value
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header winbase.h (include Windows.h)
Library Kernel32.lib
DLL Kernel32.dll

See also