取屏幕坐标颜色错误求助！

[shazi_pig]

// GdiApp.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "GdiApp.h"
#define MAX_LOADSTRING 100

// 全局变量:
HINSTANCE hInst; // 当前实例
TCHAR szTitle[MAX_LOADSTRING]; // 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING]; // 主窗口类名

// 此代码模块中包含的函数的前向声明:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR lpCmdLine,
int nCmdShow)
{
// TODO: 在此放置代码。
MSG msg;
HACCEL hAccelTable;

// 初始化全局字符串
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_GDIAPP, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// 执行应用程序初始化:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_GDIAPP);

// 主消息循环:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return (int) msg.wParam;
}



//
// 函数: MyRegisterClass()
//
// 目的: 注册窗口类。
//
// 注释:
//
// 仅当希望在已添加到 Windows 95 的
// “RegisterClassEx”函数之前此代码与 Win32 系统兼容时，
// 才需要此函数及其用法。调用此函数
// 十分重要，这样应用程序就可以获得关联的
// “格式正确的”小图标。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_GDIAPP);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_BACKGROUND+1);
wcex.lpszMenuName = (LPCTSTR)IDC_GDIAPP;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

return RegisterClassEx(&wcex);
}

//
// 函数: InitInstance(HANDLE, int)
//
// 目的: 保存实例句柄并创建主窗口
//
// 注释:
//
// 在此函数中，我们在全局变量中保存实例句柄并
// 创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

hInst = hInstance; // 将实例句柄存储在全局变量中

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

//
// 函数: WndProc(HWND, unsigned, WORD, LONG)
//
// 目的: 处理主窗口的消息。
//
// WM_COMMAND - 处理应用程序菜单
// WM_PAINT - 绘制主窗口
// WM_DESTROY - 发送退出消息并返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
POINT point;
COLORREF color;
char buffer[17];
switch (message)
{
case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// 分析菜单选择:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
BeginPaint(0,&ps);

EndPaint(0,&ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_CREATE:
hdc = GetWindowDC (hWnd) ;
break;
case WM_MOUSEMOVE:

hdc=GetDC(hWnd);
point.x=LOWORD(lParam);
point.y=HIWORD(lParam);
// GetCursorPos(&point);
//ClientToScreen(hWnd,&point);
//ScreenToClient(hWnd,&point);
color=GetPixel(hdc,point.x,point.y);
sprintf(buffer,"RGB(%d,%d,%d)",GetRValue(color),GetGValue(color),GetBValue(color));
TextOut(hdc,50,50,TEXT(buffer),strlen(buffer));
memset(buffer,0,17);
sprintf(buffer,"Point(%d,%d)",point.x ,point.y);
TextOut(hdc,50,70,TEXT(buffer),strlen(buffer));
DeleteDC (hdc) ;
break;
case WM_NCMOUSEMOVE:
hdc=GetDC(0);
GetCursorPos(&point);
//ClientToScreen(hWnd,&point);
//point.x=LOWORD(lParam);
//point.y=HIWORD(lParam);
ScreenToClient(hWnd,&point);
color=GetPixel(hdc,point.x,point.y);
sprintf(buffer,"RGB(%d,%d,%d)",GetRValue(color),GetGValue(color),GetBValue(color));
TextOut(hdc,50,50,TEXT(buffer),strlen(buffer));
memset(buffer,0,17);
sprintf(buffer,"Point(%d,%d)",point.x ,point.y);
TextOut(hdc,50,70,TEXT(buffer),strlen(buffer));
DeleteDC (hdc) ;

break;


default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// “关于”框的消息处理程序。
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}

[cpio]

是不是坐标没有转换啊

ClientToScreen

[shazi_pig]

不是，当前窗口外的消息无法捕捉到。怀疑是消息类型的错误，刚接触，因此很难找到问题。

[shazi_pig]

case WM_MOUSEMOVE:

hdc=GetDC(hWnd);
point.x=LOWORD(lParam);
point.y=HIWORD(lParam);
color=GetPixel(hdc,point.x,point.y);
sprintf(buffer,"RGB(%d,%d,%d)",GetRValue(color),GetGValue(color),GetBValue(color));
TextOut(hdc,50,50,TEXT(buffer),strlen(buffer));
sprintf(buffer,"Point(%d,%d)",point.x ,point.y);
TextOut(hdc,50,70,TEXT(buffer),strlen(buffer));
DeleteDC (hdc) ;
break;
case WM_NCMOUSEMOVE:
hdc=GetDC(0);
GetCursorPos(&point);
ScreenToClient(hWnd,&point);
color=GetPixel(hdc,point.x,point.y);
sprintf(buffer,"RGB(%d,%d,%d)",GetRValue(color),GetGValue(color),GetBValue(color));
TextOut(hdc,50,50,TEXT(buffer),strlen(buffer));
sprintf(buffer,"Point(%d,%d)",point.x ,point.y);
TextOut(hdc,50,70,TEXT(buffer),strlen(buffer));
DeleteDC (hdc) ;

break;
这是主要的代码，看看什么问题？