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RegisterWindowMessage info  Overview  Group

The RegisterWindowMessage function defines a new window message that is guaranteed to be unique throughout the system. The returned message value can be used when calling the SendMessage or PostMessage function.

UINT RegisterWindowMessage(

    LPCTSTR lpString 

// address of message string

   );

Parameters

lpString
Points to a null-terminated string that specifies the message to be registered.

Return Values

If the message is successfully registered, the return value is a message identifier in the range 0xC000 through 0xFFFF.

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

Remarks

The RegisterWindowMessage function is typically used to register messages for communicating between two cooperating applications.

If two different applications register the same message string, the applications return the same message value. The message remains registered until the Windows session ends.

Only use RegisterWindowMessage when more than one application must process the same message. For sending private messages within a window class, an application can use any integer in the range WM_USER through 0x7FFF. (Messages in this range are private to a window class, not to an application. For example, predefined control classes such as BUTTON, EDIT, LISTBOX, and COMBOBOX may use values in this range.)

See Also

PostMessage, SendMessage


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