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    <p>Use a layered window that covers the entire screen, but paint it with color key values such that the rectangular region of interest (the area that should be undarkened) is filled entirely with the color key. This region will then be completely transparent, and not darkened like the rest of the desktop. The rest of your layered window should be set to have a constant alpha value that is mostly transparent and filled with a dark color.</p> <p>Here's a complete, working example:</p> <pre> #include "stdafx.h" #include "ScreenCapper.h" #define MAX_LOADSTRING 100 // Global Variables: HINSTANCE hInst; // current instance TCHAR szTitle[MAX_LOADSTRING]; // The title bar text TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name // Forward declarations of functions included in this code module: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM); const COLORREF transparentColor = RGB(255,0,0); // Pure red is the color key, or totally transparent color const BYTE overallTranparencyAmount = 90; // Out of 255 int DesktopWidth,DesktopHeight; int APIENTRY _tWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR lpCmdLine,int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); DesktopWidth = GetSystemMetrics(SM_CXSCREEN); DesktopHeight = GetSystemMetrics(SM_CYSCREEN); MSG msg; HACCEL hAccelTable; LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadString(hInstance, IDC_SCREENCAPPER, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_SCREENCAPPER)); while (GetMessage(&msg, NULL, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return (int) msg.wParam; } ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; memset(&wcex,0,sizeof(WNDCLASSEX)); wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_SCREENCAPPER)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); //wcex.lpszMenuName = MAKEINTRESOURCE(IDC_SCREENCAPPER); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassEx(&wcex); } BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { hInst = hInstance; HWND hWnd = CreateWindowEx(WS_EX_LAYERED, szWindowClass, szTitle,WS_POPUP, 0, 0, DesktopWidth, DesktopHeight, NULL, NULL, hInstance, NULL); if (!hWnd) return FALSE; SetLayeredWindowAttributes(hWnd,transparentColor,32,LWA_COLORKEY | LWA_ALPHA); ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; PAINTSTRUCT ps; HDC hdc; if (message == WM_COMMAND) { wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections: switch (wmId) { case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } } else if (message == WM_PAINT) { hdc = BeginPaint(hWnd, &ps); HBRUSH hDarkBackgroundBrush = CreateSolidBrush(RGB(0,0,0)); HBRUSH hRegionOfInterestBrush = CreateSolidBrush(transparentColor); RECT screenRect; screenRect.left = screenRect.top = 0; screenRect.right = DesktopWidth; screenRect.bottom = DesktopHeight; RECT interestRect; interestRect.left = interestRect.top = 300; interestRect.right = interestRect.bottom = 600; FillRect(hdc,&screenRect,hDarkBackgroundBrush); FillRect(hdc,&interestRect,hRegionOfInterestBrush); DeleteObject(hDarkBackgroundBrush); DeleteObject(hRegionOfInterestBrush); EndPaint(hWnd, &ps); } else if (message == WM_DESTROY) { PostQuitMessage(0); } else return DefWindowProc(hWnd, message, wParam, lParam); return 0; } </pre>
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    1. COThanks Clay, that makes sense but I'm struggling putting some sample code together to do it. I've got the transparent window but am stuck on where to go from here. It has been way too long since I've done any low level Windows graphics coding and it was never a strong point of mine.
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    2. COAlright, I'll post a complete sample as another answer to this same question.
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    3. COThere's a complete example, nevf. Whew. Hope that helps.
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