acmStreamConvertCallback callback function
The acmStreamConvertCallback function specifies an application-provided callback function to be used when the acmStreamOpen function specifies the CALLBACK_FUNCTION flag. The acmStreamConvertCallback name is a placeholder for an application-defined function name.
Syntax
void CALLBACK acmStreamConvertCallback(
HACMSTREAM has,
UINT uMsg,
DWORD dwInstance,
LPARAM lParam1,
LPARAM lParam2
);
Parameters
has
Handle to the ACM conversion stream associated with the callback function.uMsg
ACM conversion stream message. The following values are defined.Value Meaning MM_ACM_CLOSE ACM has successfully closed the conversion stream identified by has. The handle specified by has is no longer valid after receiving this message. MM_ACM_DONE ACM has successfully converted the buffer identified by lParam1 (which is a pointer to the ACMSTREAMHEADER structure) for the stream handle identified by has. MM_ACM_OPEN ACM has successfully opened the conversion stream identified by has. dwInstance
User-instance data given as the dwInstance parameter of the acmStreamOpen function.lParam1
Message parameter.lParam2
Message parameter.
Return value
This function does not return a value.
Remarks
The following functions should not be called from within the callback function: acmDriverAdd, acmDriverRemove, and acmDriverPriority.
Requirements
Minimum supported client |
Windows 2000 Professional [desktop apps only] |
Minimum supported server |
Windows 2000 Server [desktop apps only] |
Header |
Msacm.h |