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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| WinNT
| Platform Notes
| None
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RegisterWindowMessage
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
| );
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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.
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
PostAppMessage, PostMessage, SendMessage
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