简介

功能

参数

范例

简介

函数功能：该函数调用缺省的窗口过程来为应用程序没有处理的任何窗口消息提供缺省的处理。该函数确保每一个消息得到处理。调用DefWindowProc函数时使用窗口过程接收的相同参数。

函数原型：LRESULT DefWindowProc（HWND hWnd，UINT Msg，WPARAM wParam，LPARAM IParam）；

功能

DefWindowProc这个函数是默认的窗口处理函数，我们可以把不关心的消息都丢给它来处理。这个函数在处理关闭窗口消息WM_CLOSE时，是调用DestroyWindow函数关闭窗口并且发WM_DESTROY

消息给应用程序；而它对WM_DESTROY这个消息是不处理的（考虑为什么？）；我们在应用程序中对这个消息的处理是发出WM_QUIT消息。因此WM_CLOSE、WM_DESTROY、WM_QUIT这三个消息是先后产生的。

参数

hWnd：指向接收消息的窗口过程的句柄。

Msg：指定消息类型。

wParam：指定其余的、消息特定的信息。该参数的内容与Msg参数值有关。

IParam：指定其余的、消息特定的信息。该参数的内容与Msg参数值有关。

返回值：返回值就是消息处理结果，它与发送的消息有关。

备注：对于Windows CE；如果Msg为WM_SETTEXT那么返回0。

当DefWindowProc处理WM_DESTROY消息时，它不自动调用PostQuitMessage。

速查：Windows NT 3.1以上版本；Windows：95以上版本：Windows CE以上版本；头文件；winuser.h；库文件：user32.lib；Unicode：在Windows NT环境中以Unicode和ANSI版本实现。

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DefWindowProc Function

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The DefWindowProc function calls the default window procedure to provide default processing for any window messages that an application does not process. This function ensures that every message is processed. DefWindowProc is called with the same parameters received by the window procedure.

Syntax

LRESULT DefWindowProc( HWND hWnd,

UINT Msg,

WPARAM wParam,

LPARAM lParam

);

Parameters

hWnd

[in] Handle to the window procedure that received the message.

Msg

[in] Specifies the message.

wParam

[in] Specifies additional message information. The content of this parameter depends on the value of the Msg parameter.

lParam

[in] Specifies additional message information. The content of this parameter depends on the value of the Msg parameter.

Return Value

The return value is the result of the message processing and depends on the message.

Remarks

Windows 95/98/Me: DefWindowProcW is supported by the Microsoft Layer for Unicode (MSLU). To use this, you must add certain files to your application, as outlined in Microsoft Layer for Unicode on Windows 95/98/Me Systems .

Example

For an example, see Designing a Window Procedure.

Function Information

Minimum DLL Version user32.dll

Header Declared in Winuser.h, include Windows.h

Import library User32.lib

Minimum operating systems Windows 95, Windows NT 3.1

Unicode Implemented as ANSI and Unicode versions

范例

/*------------------------------------------------------------

HELLOWIN.C -- Displays "Hello, Windows 98!" in client area

(c) Charles Petzold, 1998

------------------------------------------------------------*/

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;//声明

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow) //命令行参数，窗口显示方式

{

static TCHAR szAppName[] = TEXT ("HelloWin") ;

HWND hwnd ;

MSG msg ;

WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;

wndclass.lpfnWndProc = WndProc ;

wndclass.cbClsEx tra = 0 ;

wndclass.cbWndExtra = 0 ;

wndclass.hInstance = hInstance ;

wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;

wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;

wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;

wndclass.lpszMenuName = NULL ;

wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))

{

MessageBox (NULL, TEXT ("This program requires Windows NT!"),

szAppName, MB_ICONERROR) ;

return 0 ;

}

hwnd = CreateWindow (szAppName, // window class name

TEXT ("The Hello Program"), // window caption

WS_OVERLAPPEDWINDOW, // window style

CW_USEDEFAULT, // initial x position

CW_USEDEFAULT, // initial y position

CW_USEDEFAULT, // initial x size

CW_USEDEFAULT, // initial y size

NULL, // parent window handle

NULL, // window menu handle

hInstance, // program instance handle

NULL) ; // creation parameters

ShowWindow (hwnd, iCmdShow) ;

UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))

{

TranslateMessage (&msg) ;//

DispatchMessage (&msg) ;

}

return msg.wParam ;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

HDC hdc ;

PAINTSTRUCT ps ;

RECT rect ;

switch (message)

{

case WM_CREATE:

PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;

return 0 ;

case WM_PAINT:

hdc = BeginPaint (hwnd, &ps) ;

GetClientRect (hwnd, &rect) ;

DrawText (hdc, TEXT ("Hello, Windows 98!"), -1, &rect,

DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;

EndPaint (hwnd, &ps) ;

return 0 ;

case WM_DESTROY:

PostQuitMessage (0) ;

return 0 ;

}

return DefWindowProc (hwnd, message, wParam, lParam) ;

}