oldworm(oldworm)进来啊

Question

我在窗口过程中调用SetClassLong(hwnd,GCL_WNDPROC,(long)WndProc2);修改改了窗口的窗口过程为WndProc2
在WndProc2中仅仅调用了DefWindowProc，但是消息还是给我原来的窗口过程WndProc给截获了，是怎么回事？

Answer 1

#include <windows.h>
#include <stdio.h>
#include "resource.h"LRESULT CALLBACK WndProc2(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam);
char szMessage[128];
HINSTANCE hInst;
char classname[]="myclsname";int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{
static char appname[]="My windows";
WNDCLASS wc;
MSG msg;
HWND hwnd;
hInst=hInstance;
wc.cbClsExtra=0;
wc.cbWndExtra=0;
wc.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wc.hCursor=LoadCursor(hInstance,MAKEINTRESOURCE(IDC_CURSOR1));
wc.hIcon=LoadIcon(hInstance,MAKEINTRESOURCE(IDI_ICON1));
wc.hInstance=hInstance;
wc.lpfnWndProc=WndProc;
wc.lpszClassName=classname;
wc.lpszMenuName=NULL;
wc.style=CS_HREDRAW|CS_VREDRAW;
if(!RegisterClass(&wc))
return 0;
hwnd=CreateWindow(classname,appname,WS_OVERLAPPEDWINDOW|WS_VSCROLL,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,nShowCmd);
UpdateWindow(hwnd);
// SetTimer(hwnd,123,10000,NULL);
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;
char chr[2];
char str[40];
static int cx=0,cy=0,flag=1;
int i;
HICON hicon;
TEXTMETRIC tm;
HWND wnd;
static int iCurpos=0;
switch(message)
{
case WM_RBUTTONDOWN:
SetClassLong(hwnd,GCL_WNDPROC,(long)WndProc2);
i=GetLastError();
break;
case WM_LBUTTONDOWN:
hicon=LoadIcon(hInst,MAKEINTRESOURCE(IDI_NEWICON));
SetClassLong(hwnd,GCL_HICON,(LONG)hicon);
break;
case WM_CREATE:
SetScrollRange(hwnd,SB_VERT,0,100-1,FALSE);
hdc=GetDC(hwnd);
GetTextMetrics(hdc,&tm);
ReleaseDC(hwnd,hdc);
cx=tm.tmAveCharWidth;
cy=tm.tmHeight+tm.tmInternalLeading;//.tmExternalLeading;
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
for(i=0;i<100;i++)
{
sprintf(str,"%d  the screen width is %d",i,GetSystemMetrics(0));
TextOut(hdc,0,cy*(i-iCurpos),str,strlen(str));
//sprintf(str,"the screen high is %d",GetSystemMetrics(1));
//TextOut(hdc,0,cy*i+,str,strlen(str));
}
EndPaint(hwnd,&ps);
return 0;
case WM_CHAR:
memset(chr,0,sizeof(chr));
chr[0]=(int)wParam;
strcat(szMessage,chr);
GetClientRect(hwnd,&rect);
InvalidateRect(hwnd,&rect,TRUE);
return 0;
case WM_TIMER:
if(flag)
{
cy=100;
for(cx=100;cx<600;cx++)
{
SetCursorPos(cx,cy);
Sleep(10);
}
flag=0;
}
else
{
cy=50;
for(cx=600;cx>100;cx--)
{
SetCursorPos(cx,cy);
Sleep(10);
}
flag=1;
mouse_event(MOUSEEVENTF_LEFTDOWN,cx,cy,0,0);
mouse_event(MOUSEEVENTF_LEFTUP,cx,cy,0,0);
}
Sleep(1000);
for(;;)
{
   if((wnd=FindWindow(TEXT("IEFrame"),NULL))!=NULL)
PostMessage(wnd,WM_CLOSE,0,0);
else
break;
}
return 0;
case WM_VSCROLL:
switch(LOWORD(wParam))
{
case SB_LINEUP:
iCurpos--;
break;
case SB_LINEDOWN:
iCurpos++;
break;
}
SetScrollPos(hwnd,SB_VERT,iCurpos,TRUE);
InvalidateRect(hwnd,NULL,TRUE);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}LRESULT CALLBACK WndProc2(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
return DefWindowProc(hwnd,message,wParam,lParam);
}

Answer 2

把你的代码这一行
SetClassLong (hwnd, GCL_WNDPROC, (LONG)WndProc2);
换成下面一行，问题搞定
SetWindowLong(hwnd, GWL_WNDPROC, (LONG)WndProc2);