1/2/2023 0 Comments Windows api copyimage![]() ![]() Private void RichTextBox1_DragEnter(object sender, DragEventArgs e) RichTextBox1.DragEnter += RichTextBox1_DragEnter RichTextBox1.DragDrop += RichTextBox1_DragDrop There is a better way, we can add two events to drag and drop images directly into Richtextbox. If (dialog.ShowDialog() = .OK)ĭataFormats.GetFormat(DataFormats.Bitmap) OpenFileDialog dialog = new OpenFileDialog() ĭialog.Filter = "Image files (*.jpg, *.jpeg, *.jpe, *.jfif, *.png) | *.jpg *.jpeg *.jpe *.jfif *.png" private void button1_Click(object sender, EventArgs e) It will get a cropped screenshot(800圆00) file of the current screen.Richtextbox seems to fulfill your requirements. ![]() Close the handle for the file that was created WriteFile(hFile, (LPSTR)lpbitmap, dwBmpSize, &dwBytesWritten, NULL) WriteFile(hFile, (LPSTR)&bi, sizeof(BITMAPINFOHEADER), &dwBytesWritten, NULL) WriteFile(hFile, (LPSTR)&bmfHeader, sizeof(BITMAPFILEHEADER), &dwBytesWritten, NULL) Offset to where the actual bitmap bits start.īmfHeader.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER) Add the size of the headers to the size of the bitmap to get the total file sizeĭWORD dwSizeofDIB = dwBmpSize + sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) HANDLE hFile = CreateFile(L"captureqwsx.bmp", A file is created, this is where we will save the screen capture. Gets the "bits" from the bitmap and copies them into a buffer HANDLE hDIB = GlobalAlloc(GHND, dwBmpSize) Ĭhar *lpbitmap = (char *)GlobalLock(hDIB) call HeapAlloc using a handle to the process's default heap. Starting with 32-bit Windows, GlobalAlloc and LocalAlloc are implemented as wrapper functions that GetObject(hbmScreen, sizeof(BITMAP), &bmpScreen) ĭWORD dwBmpSize = ((bmpScreen.bmWidth * bi.biBitCount + 31) / 32) * 4 * bmpScreen.bmHeight HBITMAP bmpnew = crop_image(rc, hbmScreen) MessageBox(hWnd, L"BitBlt has failed", L"Failed", MB_OK) Bit block transfer into our compatible memory DC. Select the compatible bitmap into the compatible memory DC. MessageBox(hWnd, L"CreateCompatibleBitmap Failed", L"Failed", MB_OK) HbmScreen = CreateCompatibleBitmap(hdcWindow, rc.right - rc.left, rc.bottom - rc.top) Create a compatible bitmap from the Window DC MessageBox(hWnd, L"StretchBlt has failed", L"Failed", MB_OK) The source DC is the entire screen and the destination DC is the current window (HWND) Get the client area for size calculation ![]() MessageBox(hWnd, L"CreateCompatibleDC has failed", L"Failed", MB_OK) HdcMemDC = CreateCompatibleDC(hdcWindow) Create a compatible DC which is used in a BitBlt from the window DC Retrieve the handle to a display device context for the client Windows api copyimage how to#You only need to change some of the code, such as changing the cropped area, and the example also shows how to save the cropped area as a file. The APIs used are described in detail in the example. Because you didn't provide the complete code, I couldn't get more conclusions.įor the process of clipping screenshots, we can easily modify it according to the official example. After I test, I can get the cropped area, not the reduced screenshot. Windows api copyimage code#The deleted code doesn't do anything useful. Your code can be reduced to this: HBITMAP crop_image(const RECT rectangle, const HBITMAP source_image) How can I fix my code to crop the image as desired? Hdc_mem, rectangle.left, rectangle.top, SRCCOPY) Rectangle.bottom - rectangle.top, LR_CREATEDIBSECTION)) Ĭonst auto hdc_mem = CreateCompatibleDC(nullptr) Ĭonst auto hdc_mem2 = CreateCompatibleDC(nullptr) Ĭonst auto h_old_bmp = static_cast(SelectObject(hdc_mem, source_image)) Ĭonst auto h_old_bmp2 = static_cast(SelectObject(hdc_mem2, h_clone)) īitBlt(hdc_mem2, 0, 0, rectangle.right - rectangle.left, rectangle.bottom - rectangle.top, The following code however only squeezes the image into the correct new rectangle size but does not crop it: HBITMAP crop_image(const RECT rectangle, const HBITMAP source_image)Ĭonst auto h_clone = static_cast(CopyImage(source_image, IMAGE_BITMAP, rectangle.right - rectangle.left, Now I want to crop a certain region/rectangle out of it and return it as a new HBITMAP. I have an HBITMAP holding the screenshot of a window. ![]()
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