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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
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| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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WinMain
The WinMain function is called by the system as the initial entry point for a Win32-based
application.
int WINAPI WinMain(
HINSTANCE hInstance,
| // handle to current instance
| HINSTANCE hPrevInstance,
| // handle to previous instance
| LPSTR lpCmdLine,
| // pointer to command line
| int nCmdShow
| // show state of window
| );
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Parameters
hInstance
Identifies the current instance of the application.
hPrevInstance
Identifies the previous instance of the application. For a Win32-based
application, this parameter is always NULL. If you need to detect whether another
instance already exists, create a named mutex using the CreateMutex function. If the GetLastError function returns ERROR_ALREADY_EXISTS, another instance of your application
exists (it created the mutex).
lpCmdLine
Points to a null-terminated string specifying the command line for the
application.
nCmdShow
Specifies how the window is to be shown. This parameter can be one of the
following values:
Value
| Meaning
| SW_HIDE
| Hides the window and activates another window.
| SW_MINIMIZE
| Minimizes the specified window and activates the top-level window in the
system's list.
| SW_RESTORE
| Activates and displays a window. If the window is minimized or maximized,
Windows restores it to its original size and position (same as SW_SHOWNORMAL).
| SW_SHOW
| Activates a window and displays it in its current size and position.
| SW_SHOWMAXIMIZED
| Activates a window and displays it as a maximized window.
| SW_SHOWMINIMIZED
| Activates a window and displays it as an icon.
| SW_SHOWMINNOACTIVE
| Displays a window as an icon. The active window remains active.
| SW_SHOWNA
| Displays a window in its current state. The active window remains active.
| SW_SHOWNOACTIVATE
| Displays a window in its most recent size and position. The active window
remains active.
| SW_SHOWNORMAL
| Activates and displays a window. If the window is minimized or maximized,
Windows restores it to its original size and position (same as SW_RESTORE).
|
Return Values
If the function succeeds, terminating when it receives a WM_QUIT message, it
should return the exit value contained in that message's wParam parameter. If the function terminates before entering the message loop, it
should return 0.
Remarks
WinMain initializes an application, displays its main window, and then enters a
message retrieval-and-dispatch loop that is the top-level control structure for the
remainder of the application's execution. The message loop terminates when a
WM_QUIT message is received. At that point, WinMain exits the application, returning the value passed in the WM_QUIT message's wParam parameter. If WM_QUIT was received as a result of calling PostQuitMessage, the value of wParam is the value of the PostQuitMessage function's nExitCode parameter. For more information, see Creating a Message Loop.
See Also
CreateMutex, DispatchMessage, GetMessage, PostQuitMessage, TranslateMessage
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