win32中多个子控件如何共用一个回调函数

Question

在一个父窗口上要创建多个自定义的同类型的子控件,如何给每个子控件创建一个回调函数,那会很麻烦.能不能给这些子控件共用一个回调函数呢?如果共用一个回调函数怎么实现这些子控件的重绘,还有比如发生了单击事件,如何知道是哪个子控件发出的?

Answer 1

WM_PAINT 和 WM_create肯定是无法区分的  按钮的话你确定不同的ID号进行消息相应就行了

Answer 2

最简单的办法：用SendMessage，子控件给父窗体发消息，用自定义消息ID来区分不同的子控件，然后在父窗体的WindowsProc里面处理这些消息。

Answer 3

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <windowsx.h>
#define WINDOW_CLASS_NAME "WINCLASS"
LRESULT CALLBACK WindowProc(HWND,UINT,WPARAM,LPARAM);
LRESULT CALLBACK MyBtProc(HWND,UINT,WPARAM,LPARAM);
void InitMyButton(HINSTANCE hinstance,HWND hwnd);
//static HDC hdc,hdcmen;
//static HBITMAP hbtmap;
HWND hmybt[9];
static int pos[9][2]={0,0,1,0,2,0,0,1,1,1,2,1,0,2,1,2,2,2};  //存储各小块图片的左上角坐标int WINAPI WinMain (HINSTANCE hinstance, HINSTANCE hprevinstance,                   PSTR szcmdLine, int icmdshow){

HWND       hwnd;
MSG        msg;
WNDCLASSEX winclass; winclass.cbSize       = sizeof(WNDCLASSEX);
winclass.style        = CS_DBLCLKS|CS_OWNDC|CS_HREDRAW|CS_VREDRAW;
winclass.lpfnWndProc  = WindowProc;
winclass.cbClsExtra   = 0;
winclass.cbWndExtra   = 0;
winclass.hInstance    = hinstance;
winclass.hIcon        = LoadIcon(NULL,IDI_APPLICATION);
winclass.hCursor      = LoadCursor(NULL,IDC_ARROW);
winclass.hbrBackground= GetStockObject(WHITE_BRUSH);
winclass.lpszMenuName = NULL;
winclass.lpszClassName= WINDOW_CLASS_NAME;
winclass.hIconSm      = LoadIcon(NULL,IDI_APPLICATION); if(!RegisterClassEx(&winclass))
return (0); if(!(hwnd = CreateWindowEx(NULL,
                       WINDOW_CLASS_NAME,
   "WinFormPrj",
   WS_MINIMIZEBOX|WS_SYSMENU|WS_VISIBLE,
                               440,312,
   400,400,
                               NULL, 
   NULL, 
   hinstance, 
   NULL)))
return (0); InitMyButton(hinstance,hwnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
} return(msg.wParam);}void InitMyButton(HINSTANCE hinst,HWND hwnd)
{
WNDCLASSEX winclass;
int i; winclass.cbSize       = sizeof(WNDCLASSEX);
winclass.style        = CS_HREDRAW|CS_VREDRAW;
winclass.lpfnWndProc  = MyBtProc;
winclass.cbClsExtra   = 0;
winclass.cbWndExtra   = 0;
winclass.hInstance    = hinst;
winclass.hIcon        = LoadIcon(NULL,IDI_APPLICATION);
winclass.hCursor      = LoadCursor(NULL,IDC_ARROW);
winclass.hbrBackground= GetStockObject(WHITE_BRUSH);
winclass.lpszMenuName = NULL;
winclass.lpszClassName= "MyButton";
winclass.hIconSm      = LoadIcon(NULL,IDI_APPLICATION); RegisterClassEx(&winclass); for(i=0;i<9;i++)
{
hmybt[i]=CreateWindow("MyButton",
                NULL,
                WS_BORDER|WS_CHILD|WS_VISIBLE,
                pos[i][0]*131,pos[i][1]*122,
                131,122,
                hwnd,
                NULL,
                hinst,
NULL);
}
}LRESULT CALLBACK MyBtProc(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam)
{
HDC hdcpaint;
PAINTSTRUCT ps;
static HDC hdc,hdcmen;
static HBITMAP hbtmap;
int i;      //循环变量
//int px,py;  //贴图左上角坐标
//static int pos[9][2]={0,0,1,0,2,0,0,1,1,1,2,1,0,2,1,2,2,2};  //存储各小块图片的左上角坐标 switch(msg)
{
    case WM_CREATE:
{
    hdc=GetDC(hwnd);
hdcmen=CreateCompatibleDC(hdc);
hbtmap=(HBITMAP)LoadImage(NULL,"kitty.bmp",IMAGE_BITMAP,393,366,LR_LOADFROMFILE);  
            SelectObject(hdcmen,hbtmap);


return 0;
}break;

case WM_PAINT:
{
for(i=0;i<9;i++)
{
hdcpaint=BeginPaint(hmybt[i],&ps);
    BitBlt(hdc,0,0,131,122,hdcmen,pos[i][0]*131,pos[i][1]*122,SRCCOPY);
                BitBlt(hdcpaint,0,0,131,122,hdc,0,0,SRCCOPY);
EndPaint(hmybt[i],&ps);
}

return 0;
}break; case WM_LBUTTONDOWN:
{

return 0;
}break; case WM_DESTROY:
{
DeleteObject(hbtmap);
DeleteDC(hdc);
DeleteDC(hdcmen); PostQuitMessage(0);
return 0;
}break;
}
return (DefWindowProc(hwnd,msg,wparam,lparam));
}LRESULT CALLBACK WindowProc(HWND hwnd,UINT msg,WPARAM wparam,LPARAM lparam)
{ switch(msg)
{
    /*case WM_CREATE:
{ return (0);
}*/
    

        case WM_DESTROY:
{
PostQuitMessage(0);
return (0);
} break; default:break;
}
return (DefWindowProc(hwnd,msg,wparam,lparam));
}
就是这个程序，为什么在重绘子控件时出现问题，当其他窗口拖动过这些子窗口控件时没有发生重绘