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POC# - DrawIcon not using cursor mask when drawing to image (Example for I-beam cursor)
 

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  1. POC# - DrawIcon not using cursor mask when drawing to image (Example for I-beam cursor)
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    <p>If i use DrawIcon when taking a screenshot, it can draw I-beam cursor with mask properly but if I want to use DrawIcon on any image then masking does not work.</p> <p>This DrawIcon example works properly:</p> <pre><code> public static Image CaptureRectangleNative(IntPtr handle, Rectangle rect, bool captureCursor = false) { if (rect.Width == 0 || rect.Height == 0) { return null; } IntPtr hdcSrc = NativeMethods.GetWindowDC(handle); IntPtr hdcDest = NativeMethods.CreateCompatibleDC(hdcSrc); IntPtr hBitmap = NativeMethods.CreateCompatibleBitmap(hdcSrc, rect.Width, rect.Height); IntPtr hOld = NativeMethods.SelectObject(hdcDest, hBitmap); NativeMethods.BitBlt(hdcDest, 0, 0, rect.Width, rect.Height, hdcSrc, rect.X, rect.Y, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt); if (captureCursor) { Point cursorOffset = CaptureHelpers.ScreenToClient(rect.Location); try { using (CursorData cursorData = new CursorData()) { cursorData.DrawCursorToHandle(hdcDest, cursorOffset); } } catch (Exception e) { DebugHelper.WriteException(e, "Cursor capture failed."); } } NativeMethods.SelectObject(hdcDest, hOld); NativeMethods.DeleteDC(hdcDest); NativeMethods.ReleaseDC(handle, hdcSrc); Image img = Image.FromHbitmap(hBitmap); NativeMethods.DeleteObject(hBitmap); return img; } // This function inside CursorData class public void DrawCursorToHandle(IntPtr hdcDest, Point cursorOffset) { if (IconHandle != IntPtr.Zero) { Point drawPosition = new Point(Position.X - cursorOffset.X, Position.Y - cursorOffset.Y); NativeMethods.DrawIcon(hdcDest, drawPosition.X, drawPosition.Y, IconHandle); } } </code></pre> <p>But this DrawIcon example is not using a mask, so I-beam icon becomes white and in a white background it's not visible:</p> <pre><code> public void DrawCursorToImage(Image img, Point cursorOffset) { if (IconHandle != IntPtr.Zero) { Point drawPosition = new Point(Position.X - cursorOffset.X, Position.Y - cursorOffset.Y); using (Graphics g = Graphics.FromImage(img)) { g.DrawIcon(Icon.FromHandle(IconHandle), drawPosition.X, drawPosition.Y); } } } </code></pre> <p>I think if I don't use desktop hdc then DrawIcon is not using a mask. How can I fix DrawCursorToImage method so it can use cursor mask properly? By the way, i read this post: <a href="https://stackoverflow.com/questions/918990/c-sharp-capturing-the-mouse-cursor-image">C# - Capturing the Mouse cursor image</a> and it don't have a solution to my problem too. Thanks for reading this.</p>
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