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Question

如何用三个滑块，分别是红绿蓝，实现改变对话框的背景颜色？

Answer 1

1、创建成员变量HBRUSH m_brush; 
2、滑块变化时响应函数里m_brush.CreateSolidBrush(RGB(r,   g,   b)；
2、重载对话框OnCtlColor，在该函数里面返回画刷句柄m_brush

Answer 2

首先设置三个滑块的范围0~255，填充对话框背景你应该会了。在对话框类头文件中声明变量COLORREF color;及BYTE r; BYTE g; BYTE b;BOOL CTestDlg::OnEraseBkgnd(CDC* pDC) 
{
// TODO: Add your message handler code here and/or call default
        color = RGB(r,g,b);
CRect rect;
this->GetClientRect(rect);
pDC->FillSolidRect(rect, color);
return TRUE;
return CDialog::OnEraseBkgnd(pDC);
} 
把三个滑块的值获取过来赋给r,g,b就OK了

Answer 3

三个滑块的值：
COLORREF crShow;
crShow=RGB(vsPos[0],vsPos[1],vsPos[2]);

Answer 4

整个程序：#define _WIN32_WINNT 0x400
#include <windows.h>
#include <stdio.h>
//
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nShowCmd)
{
    WNDCLASS wndclass;
    HWND hwnd;
    MSG msg;
    TCHAR *szName="COL";    wndclass.cbClsExtra=NULL;
    wndclass.cbWndExtra=NULL;
    wndclass.hbrBackground=CreateSolidBrush(0);
    wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
    wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wndclass.hInstance=hInstance;
    wndclass.lpfnWndProc=WndProc;
    wndclass.lpszClassName=szName;
    wndclass.lpszMenuName=NULL;
    wndclass.style=CS_VREDRAW | CS_HREDRAW;    if(!RegisterClass(&wndclass))
    {
        MessageBox(NULL,"This Pro Need Windows NT!",
            "Error",MB_OK);
        return 0;
    }
    hwnd=CreateWindow(szName,szName,
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
        NULL,NULL,hInstance,NULL);
    ShowWindow(hwnd,nShowCmd);
    UpdateWindow(hwnd);    while (GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}
WNDPROC OldStatic;
//
LRESULT CALLBACK StaticProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HWND hparentwnd;
PAINTSTRUCT ps;
HDC hdc;
HBRUSH brsh;
char Prompt[40];
// int id;
static TRACKMOUSEEVENT tme;
static DWORD counter=0; switch(message)
{
case WM_PAINT: //如果处理了此消息，WM_CTLCOLORSTATIC也无效了
// OutputDebugString("StaticProc3\n");
// return CallWindowProc(OldStatic, hwnd, message, wParam, lParam );
hparentwnd=GetParent(hwnd);
// id=GetDlgCtrlID(hwnd);
// sprintf(Prompt,"%d",id);
// OutputDebugString(Prompt);
//OutputDebugString("Before BeginPaint\n");
hdc = BeginPaint(hwnd, &ps);
//OutputDebugString("After BeginPaint\n");
//!!!
brsh=(HBRUSH) SendMessage(hparentwnd,WM_CTLCOLORSTATIC,(WPARAM)hdc,(LPARAM)hwnd);
::FillRect(hdc,&ps.rcPaint,brsh);
//!!!
TextOut(hdc, 10, 1, "Color Red", 9);
EndPaint(hwnd, &ps);
return 0;
case WM_ERASEBKGND:
//OutputDebugString("Inside BeginPaint\n");
//hdc = (HDC) wParam;
return 1;//handled
case WM_MOUSEMOVE:
// TRACKMOUSEEVENT tme;SystemParametersInfo SPI_GETMOUSEHOVERTIME 
tme.cbSize = sizeof(tme);
        tme.dwFlags = TME_HOVER|TME_LEAVE;
        tme.dwHoverTime = 15;
        tme.hwndTrack = hwnd;
        TrackMouseEvent(&tme);
break;
case WM_MOUSEHOVER:
counter++;
sprintf(Prompt,"WM_MOUSEHOVER: %d\r\n",counter);
OutputDebugString(Prompt);
        TrackMouseEvent(&tme);
break;
//     case WM_KEYDOWN:
// if(wParam==VK_TAB)
// {
// HWND wnd=GetFocus();
// int next=GetDlgCtrlID(wnd);
// wnd=GetDlgItem(hwnd,next++);
// SetFocus(wnd);
// }
// break;
}
return CallWindowProc( OldStatic, hwnd, message, wParam, lParam );
}
// 
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    static HBRUSH hStaticBrush,hBrush[3];
    static int x,y,vsPos[3],cxClient,cyClient;
    static TCHAR *szText[3]={"RED","GREEN","BLUE"},szBuffer[10];
    static HWND hwndScroll[3],hwndText[3],hwndValue[3],hwndShow;
    static COLORREF crText[3],crShow;
    static RECT rt;
    int i;
    switch (message)
    {
    case WM_CREATE:
        hwndShow=CreateWindow("static",NULL,
            WS_CHILD | WS_VISIBLE | SS_WHITERECT,
            0,0,0,0,
            hwnd,(HMENU)9,//ID=9
            (HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);        for(i=0;i<3;i++)
        {
            hwndScroll[i]=CreateWindow("scrollbar",NULL,
                WS_CHILD | WS_VISIBLE | SBS_VERT,
                0,0,0,0,
                hwnd,(HMENU)i,//ID=0-2
                (HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);
            SetScrollRange(hwndScroll[i],SB_CTL,0,255,TRUE);
            SetScrollPos(hwndScroll[i],SB_CTL,0,TRUE);
            hwndText[i]=CreateWindow("static",szText[i],//"RED..."
WS_CHILD | WS_VISIBLE | WS_TABSTOP | SS_CENTER | SS_NOTIFY,
0,0,0,0,
hwnd,(HMENU)(i+3),//ID=3,4,5
(HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);
  if(hwndText[i]) OldStatic=(WNDPROC)SetWindowLong(hwndText[i],GWL_WNDPROC,(LONG)StaticProc);
hwndValue[i]=CreateWindow("static","0",
WS_CHILD | WS_VISIBLE | SS_CENTER,
0,0,0,0,
hwnd,(HMENU)(i+6),//ID=6,7,8
(HINSTANCE)GetWindowLong(hwnd,GWL_HINSTANCE),NULL);
//            crText[2-i]=(255<<(i*4));
            vsPos[i]=0;
//            hBrush[i]=CreateSolidBrush(crText[i]);
        }
//
        hStaticBrush=CreateSolidBrush(RGB(255,200,100));//GetSysColor(COLOR_BTNHIGHLIGHT));
        return 0;
    case WM_SIZE:
        cxClient=LOWORD(lParam);
        cyClient=HIWORD(lParam);
        MoveWindow(hwndShow,0,0,cxClient/2,cyClient,TRUE);
        for(i=0;i<3;i++)
        {
            MoveWindow(hwndText[i],
                cxClient/36+cxClient*i/6,
                cyClient/15,
                cxClient/9,
                cyClient/15,
                TRUE);
        
            MoveWindow(hwndScroll[i],
                cxClient/36+cxClient*i/6,
                cyClient*23/100,
                cxClient/9,
                cyClient*27/50,
                TRUE);
        
            MoveWindow(hwndValue[i],
                cxClient/36+cxClient*i/6,
                cyClient*13/15,
                cxClient/9,
                cyClient/15,
                TRUE);
            InvalidateRect(hwndText[i],NULL,TRUE);
        }
        SetRect(&rt,cxClient/2,0,cxClient,cyClient);
        return 0;
    case WM_VSCROLL:
        i=GetWindowLong((HWND)lParam,GWL_ID);
        vsPos[i]=GetScrollPos(hwndScroll[i],SB_CTL);
        switch(LOWORD(wParam))
        {
        case SB_LINEUP:
            vsPos[i]-=1;
            break;
        case SB_LINEDOWN:
            vsPos[i]+=1;
            break;
        case SB_PAGEUP:
            vsPos[i]-=10;
            break;
        case SB_PAGEDOWN:
            vsPos[i]+=10;
            break;
        case SB_THUMBPOSITION:
        case SB_THUMBTRACK:
            vsPos[i]=HIWORD(wParam);
            break;
        }
        vsPos[i]=max(0,min(vsPos[i],255));
        SetScrollPos(hwndScroll[i],SB_CTL,vsPos[i],TRUE);
        wsprintf(szBuffer,"%i",vsPos[i]);
        SetWindowText(hwndValue[i],szBuffer);
        crShow=RGB(vsPos[0],vsPos[1],vsPos[2]);
        SetClassLong(hwnd,GCL_HBRBACKGROUND,(long)CreateSolidBrush(crShow));
        crText[0]=RGB(vsPos[0],0,0);
        crText[1]=RGB(0,vsPos[1],0);
        crText[2]=RGB(0,0,vsPos[2]);
 //       SetWindowText(hwndText[i],szText[i]);
InvalidateRect(hwndText[i],NULL,TRUE);
InvalidateRect(hwnd,&rt,TRUE);
        break;
// return 0;
    case WM_CTLCOLORSCROLLBAR :
         i = GetWindowLong ((HWND) lParam, GWL_ID) ;
         hBrush[i]=CreateSolidBrush(crText[i]);
        return (LRESULT) hBrush[i] ;
    case WM_CTLCOLORSTATIC:
SetBkMode((HDC)wParam,TRANSPARENT);//
        i=GetWindowLong((HWND)lParam,GWL_ID);
        switch(i)
        {
        case 3:
SetTextColor((HDC)wParam,crText[i%3]);
            SetBkColor((HDC)wParam,RGB(255,255,255));
//
OutputDebugString("WM_CTLCOLORSTATIC3\n");
            return (LRESULT) hStaticBrush;
            break;
        case 4:
            SetTextColor((HDC)wParam,crText[i%3]);
            SetBkColor((HDC)wParam,RGB(255,255,255));
OutputDebugString("4\n");
            return (LRESULT)hStaticBrush;
            break;
         case 5:
            SetTextColor((HDC)wParam,crText[i%3]);
            SetBkColor((HDC)wParam,RGB(255,255,255));
  OutputDebugString("5\n");
            return (LRESULT)hStaticBrush;
            break;
//#if 0
 case 6:
            SetTextColor((HDC)wParam,crText[i%3]);
            SetBkColor((HDC)wParam,RGB(255,255,255));
OutputDebugString("6\n");
            return (LRESULT)hStaticBrush;
            break;
       case 7:
            SetTextColor((HDC)wParam,crText[i%3]);
            SetBkColor((HDC)wParam,RGB(255,255,255));
OutputDebugString("7\n");
            return (LRESULT)hStaticBrush;
            break;
        case 8:
            SetTextColor((HDC)wParam,crText[i%3]);
            SetBkColor((HDC)wParam,RGB(255,255,255));
OutputDebugString("8\n");
            return (LRESULT)hStaticBrush;
            break;
//#endif
        }
        break;
    case WM_SYSCOLORCHANGE :
DeleteObject (hStaticBrush) ;
hStaticBrush = CreateSolidBrush (GetSysColor (COLOR_BTNHIGHLIGHT)) ;
return 0 ;
    case WM_DESTROY:
PostQuitMessage(0);
return 0;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}

Answer 5

您不能建个MFC工程吗？飞地用Win32啊！太牛x了