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用的是WIN10,上图中的“更改文本、应用和其它项目的大小”设置为100%的情况下取色正常,如果不是100%就会取色不准,这是什么原因造成的?
颜色拾取器源码:
- /* -------------------------------------------------------------------
- MyWindows.c -- 基本窗口模型
- 《Windows 程序设计(SDK)》视频教程
- --------------------------------------------------------------------*/
- #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("MyWindows");
- 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("这个程序需要在 Windows NT 才能执行!"), szAppName, MB_ICONERROR);
- return 0;
- }
- // 指定窗口的尺寸(48 * 5)
- FindWindowSize(&cxWindow, &cyWindow);
- hwnd = CreateWindow(szAppName,
- TEXT("鱼C工作室 - 颜色提取器"),
- WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_BORDER | WS_MINIMIZEBOX, // 不允许调整窗口大小,只有最小化按钮,没有最大化按钮
- 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;
- // 遇到不懂的 API 函数可以在这里查询哦 -> http://bbs.fishc.com/thread-64179-1-1.html
- hdcScreen = CreateIC(TEXT("DISPLAY"), NULL, NULL, NULL);
- GetTextMetrics(hdcScreen, &tm);
- DeleteDC(hdcScreen);
- // 宽度为 48 个字符,高度为 5 个字符
- *pcxWindow = 2 * GetSystemMetrics(SM_CXBORDER) + 48 * tm.tmAveCharWidth;
- *pcyWindow = 2 * GetSystemMetrics(SM_CYBORDER) + GetSystemMetrics(SM_CYCAPTION) + 5 * tm.tmHeight;
- }
- LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
- {
- static COLORREF cr, crLast;
- static HDC hdcScreen, hdc;
- PAINTSTRUCT ps;
- POINT pt;
- RECT rect;
- TCHAR szBuffer[16];
- HBRUSH brush;
- switch (message)
- {
- case WM_CREATE:
- hdcScreen = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
- SetTimer(hwnd, ID_TIMER, 100, NULL);
- return 0;
- case WM_TIMER:
- GetCursorPos(&pt);
- cr = GetPixel(hdcScreen, pt.x, pt.y);
- // 如果检测到的颜色一样,那么不需要重绘窗口
- if (cr != crLast)
- {
- crLast = cr;
- InvalidateRect(hwnd, NULL, FALSE);
- }
- return 0;
- case WM_PAINT:
- hdc = BeginPaint(hwnd, &ps);
- GetClientRect(hwnd, &rect);
- // 填充客户区背景色
- brush = CreateSolidBrush(cr);
- FillRect(hdc, &rect, brush);
- wsprintf(szBuffer, TEXT(" %02X %02X %02X "), GetRValue(cr), GetGValue(cr), GetBValue(cr));
- // 设置文本背景色
- SetBkColor(hdc, cr);
- // 如果获取的色值偏深,打印白色字体;反之,打印黑色字体
- if (GetRValue(cr) + GetGValue(cr) + GetBValue(cr) > 127 + 127 + 127)
- {
- SetTextColor(hdc, RGB(0, 0, 0));
- }
- else
- {
- SetTextColor(hdc, RGB(255, 255, 255));
- }
- DrawText(hdc, szBuffer, -1, &rect, 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);
- }
复制代码
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