windows 如何在窗口上绘制图像？
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How to draw image on a window?
提问by Vinayaka Karjigi
I have created a window with createwindow() api using VS2005 in C++ on Windows Vista
我在 Windows Vista 上使用 C++ 中的 VS2005 创建了一个带有 createwindow() api 的窗口
My requirement is to draw an image (of any format) on that window. I am not using any MFC in this application.
我的要求是在该窗口上绘制图像（任何格式）。我没有在这个应用程序中使用任何 MFC。
回答by serge_gubenko
not exactly sure what is your problem: draw a bitmap on the form, or you would like know how to work with various image formats, or both. Anyways below is an example of how you could load a bitmap and draw it on the form:
不确定您的问题是什么：在表单上绘制位图，或者您想知道如何使用各种图像格式，或两者兼而有之。无论如何，下面是如何加载位图并将其绘制在表单上的示例：
HBITMAP hBitmap = NULL;
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
switch (message)
{
<...>
case WM_CREATE:
hBitmap = (HBITMAP)LoadImage(hInst, L"c:\test.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
break;
case WM_PAINT:
PAINTSTRUCT ps;
HDC hdc;
BITMAP bitmap;
HDC hdcMem;
HGDIOBJ oldBitmap;
hdc = BeginPaint(hWnd, &ps);
hdcMem = CreateCompatibleDC(hdc);
oldBitmap = SelectObject(hdcMem, hBitmap);
GetObject(hBitmap, sizeof(bitmap), &bitmap);
BitBlt(hdc, 0, 0, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);
SelectObject(hdcMem, oldBitmap);
DeleteDC(hdcMem);
EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
DeleteObject(hBitmap);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
LoadImage loads an icon, cursor, animated cursor, or bitmap. Details here
LoadImage 加载图标、光标、动画光标或位图。详情在这里
For working with various images formats you can use Windows Imaging Component (see IWICBitmapDecoder) or code from here Loading JPEG and GIF picturesor 3rd party tools like FreeImageor LeadTools
要处理各种图像格式，您可以使用 Windows Imaging Component（请参阅IWICBitmapDecoder）或来自此处的代码加载 JPEG 和 GIF 图片或 3rd 方工具，如FreeImage或LeadTools
hope this helps, regards
希望这有帮助，问候
回答by Ahmed Hussein
void LoadScreen(HWND hWnd) {
RECT rect;
HDC hdc = GetDC(hWnd);
HBRUSH brush = CreatePatternBrush((HBITMAP)LoadImage(NULL, L"file.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE));
GetWindowRect(hWnd, &rect);
FillRect(hdc, &rect, brush);
DeleteObject(brush);
ReleaseDC(hWnd, hdc);
}
