如何获得鼠标点击处的颜色信息？？？

[roaderzwl]

在一个CStatic上放置了一幅图画（bmp)。
如何实现用鼠标点击一点，返回该点的颜色信息（RGB)?
请高手指教！

[hzjdg]

这是《WINDOWS 程序设计》里的一个例子:
#include <windows.h>

#define ID_TIMER 1

void FindWindowSize (int *, int *) ;
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("WhatClr") ;
HWND hwnd ;
int cxWindow, cyWindow ;
MSG msg ;
WNDCLASS wndclass ;

wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 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 ;
}

FindWindowSize (&cxWindow, &cyWindow) ;

hwnd = CreateWindow (szAppName, TEXT ("What Color"),
WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_BORDER,
CW_USEDEFAULT, CW_USEDEFAULT,
cxWindow, cyWindow,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

void FindWindowSize (int * pcxWindow, int * pcyWindow)
{
HDC hdcScreen ;
TEXTMETRIC tm ;

hdcScreen = CreateIC (TEXT ("DISPLAY"), NULL, NULL, NULL) ;
GetTextMetrics (hdcScreen, &tm) ;
DeleteDC (hdcScreen) ;

* pcxWindow = 2 * GetSystemMetrics (SM_CXBORDER) +
12 * tm.tmAveCharWidth ;

* pcyWindow = 2 * GetSystemMetrics (SM_CYBORDER) +
GetSystemMetrics (SM_CYCAPTION) +
2 * tm.tmHeight ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static COLORREF cr, crLast ;
static HDC hdcScreen ;
HDC hdc ;
PAINTSTRUCT ps ;
POINT pt ;
RECT rc ;
TCHAR szBuffer [16] ;

switch (message)
{
case WM_CREATE:
hdcScreen = CreateDC (TEXT ("DISPLAY"), NULL, NULL, NULL) ;
SetTimer (hwnd, ID_TIMER, 100, NULL) ;
return 0 ;

case WM_DISPLAYCHANGE:
DeleteDC (hdcScreen) ;
hdcScreen = CreateDC (TEXT ("DISPLAY"), NULL, NULL, NULL) ;
return 0 ;

case WM_TIMER:
GetCursorPos (&pt) ;
cr = GetPixel (hdcScreen, pt.x, pt.y) ;

if (cr != crLast)
{
crLast = cr ;
InvalidateRect (hwnd, NULL, FALSE) ;
}
return 0 ;

case WM_PAINT:
hdc = BeginPaint (hwnd, &ps) ;

GetClientRect (hwnd, &rc) ;

wsprintf (szBuffer, TEXT (" %02X %02X %02X "),
GetRValue (cr), GetGValue (cr), GetBValue (cr)) ;

DrawText (hdc, szBuffer, -1, &rc,
DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;

EndPaint (hwnd, &ps) ;
return 0 ;

case WM_DESTROY:
DeleteDC (hdcScreen) ;
KillTimer (hwnd, ID_TIMER) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}

[softboy2002]

CPoint pt;
GetCursorPos(&pt);

HDC hDC = ::GetDC(NULL);
COLORREF clr = ::GetPixel(hDC, pt.x, pt.y);

[roaderzwl]

还是softboy2002老兄的方法更简明扼要。
不过也很感谢hzjdg兄的热情帮助！
两人各得10分，应该没意见吧！
Thanks!!!

[roaderzwl]

不好意思，我是新手，不知道该怎么给分，好像没给成功。*^_^*
你们教教我吧！