WinCreateMsgQueue: Difference between revisions
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==Related Functions== | ===Related Functions=== | ||
[[OS2 API:WinDestroyMsgQueue|WinDestroyMsgQueue]], [[OS2 API:WinPostMessage|WinPostMessage]], [[OS2 API:WinSendMessage|WinSendMessage]] | [[OS2 API:WinDestroyMsgQueue|WinDestroyMsgQueue]], [[OS2 API:WinPostMessage|WinPostMessage]], [[OS2 API:WinSendMessage|WinSendMessage]] | ||
Revision as of 23:23, 18 June 2012
WinCreateMsgQueue
- WinCreateMsgQueue( hab, maxMsg )
- Creates a message queue.
Usage Explanation
After calling WinInitialize, you must call this function if your thread needs to respond to messages. Save the handle, as other functions need it as input.
Parameters
- HAB hab (input)
- Anchor block of calling thread (from WinInitialize or WinQueryAnchorBlock).
- LONG maxMsg (input)
- The number of messages the queue can hold. Pass 0 for system default.
Returns
- HMQ hmq
- Handle to the newly created message queue. NULLHANDLE is returned if there was an error. WinGetLastError will return one of:
0x100A PMERR_RESOURCE_NOT_FOUND 0x1011 PMERR_HEAP_OUT_OF_MEMORY 0x1012 PMERR_HEAP_MAX_SIZE_REACHED 0x1018 PMERR_QUEUE_TOO_LARGE 0x1051 PMERR_NOT_IN_A_PM_SESSION 0x1052 PMERR_MSG_QUEUE_ALREADY_EXISTS
Define (C/C++)
#define INCL_WINMESSAGEMGR #include <os2.h>
Example Code
#define INCL_WINMESSAGEMGR
#include <os2.h>
HAB hab;
ULONG flOptions = 0L;
HMQ hmq;
hab=WinInitialize(flOptions);
hmq=WinCreateMsgQueue(hab, 0L);
if (hmq) {
.
.
.
}
Related Functions
WinDestroyMsgQueue, WinPostMessage, WinSendMessage