StackOverflow2013

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Id
10749621
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0
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2012-05-25T06:35:42.510
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2012-05-25T06:35:42.510
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10733475
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I've ended up creating the Bitmap in C# and passing the object to C++/CLI. As already mentioned by Hans and Vincent you have to avoid GetHDC. So my workaround reads in pseudo code as follows: Layer.cs C#: <pre><code>public Bitmap Draw() { var bitmap = new Bitmap(Width, Height, PixelFormat.Format32bppArgb); using (var graphics = Graphics.FromBitmap(bitmap) { // First: Setup rendering settings like SmoothingMode, TextRenderingHint, ... // Layer specific drawing code goes here... } return bitmap; } </code></pre> NativeRenderer.cs C++: <pre><code>void NativeRenderer::RenderFromBitmapCSharp(System::Drawing::Bitmap^ bitmap) { // Create and lock empty native bitmap Bitmap *gdiBitmap = new Bitmap(bitmap->Width, bitmap->Height, PixelFormat32bppARGB); Rect rect(0, 0, bitmap->Width, bitmap->Height); BitmapData bitmapData; gdiBitmap->LockBits(&rect, Gdiplus::ImageLockModeRead | Gdiplus::ImageLockModeWrite, PixelFormat32bppARGB, &bitmapData); // Lock managed bitmap System::Drawing::Rectangle rectangle(0, 0, bitmap->Width, bitmap->Height); System::Drawing::Imaging::BitmapData^ pBitmapData = bitmap->LockBits(rectangle, System::Drawing::Imaging::ImageLockMode::ReadOnly, System::Drawing::Imaging::PixelFormat::Format32bppArgb); // Copy from managed to unmanaged bitmap ::memcpy(bitmapData.Scan0, pBitmapData->Scan0.ToPointer(), bitmap->Width * bitmap->Height * 4); bitmap->UnlockBits(pBitmapData); gdiBitmap->UnlockBits(&bitmapData); // Draw it _graphics->DrawImage(gdiBitmap, 0, 0, bitmap->Width, bitmap->Height); } </code></pre> Hope that is helpful to others - have not found any code snippet on the web which actually does converting managed to unmanaged GDI+ Bitmap. Thank you all for your comments. Cheers, P
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1. POLosing anti aliasing when sharing Graphics object between managed and unmanaged code
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1. PTAnswer
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1. USbarnacleboy
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