Use Processes. GDI+ blocks per process a lot of ways. Yep, a pain, but there’s no way around it. Fortunately with tasks like this one (and any one that processes files on the filesystem), it’s too easy to just split the workload up between multiple processes. Fortunately it looks like GDI+ is using locks, not … Read more
I went through the same journey as a few other posters on this thread. Things I noted: Using Image.FromFile does seem unpredictable on when it releases the file handle. Calling the Image.Dispose() did not release the file handle in all cases. Using a FileStream and the Image.FromStream method works, and releases the handle on the … Read more
i’m going to cross-post my answer from over here, just so that the information gets around. There are two ways of drawing text in .NET: GDI+: graphics.MeasureString and graphics.DrawString GDI: TextRenderer.MeasureText and TextRenderer.DrawText In .NET 1.1 everything used GDI+ for text rendering. But there were some problems: There are some performance issues caused by the … Read more
There is a simpler way to flip a Graphics object. Create a Matrix which is the result of the Matrix multiplication of all the transformations that need to be applied to the specified object. A Matrix transformation can be applied to either the GraphicsPath object or the Graphics object. Or both, when multiple transformation need … Read more
Your question lacks a little clarity as to what the “best” rectangle is. I’m going to assume you mean the largest rectangle that will be 100% visible when printed. So lets start by making sure we understand what the print document graphics object “origins” are and how the OriginAtMargins property affects this origin. OriginAtMargins – … Read more
You have different options: You can draw a resizable frame on the picture box You can create a resizable control and add it to picture box In this answer, I’ve taken the second option to be able to use built-in sizing features of the controls. Here is a screen capture which shows how it looks … Read more
I posted two solutions for a similar requirement here Basically you have two options. 1- Get a graphics object for the desktop and start drawing to it. The problem is if you need to start clearing what you have previously drawn etc. Point pt = Cursor.Position; // Get the mouse cursor in screen coordinates using … Read more
From code, the closest you can do it to hide it, and perhaps make it a pain to call directly – note that even when hidden it is callable, and none of this will work past a cast: // about the closest you can do, but not really an answer [Browsable(false), EditorBrowsable(EditorBrowsableState.Never)] [Obsolete(“just cast me … Read more
You can use the Windows Imaging Component to load PNG files (on Windows XP SP2 and later). See MSDN Magazine for an introduction on how to use the API and my blog post for a code sample that loads a PNG from an IStream and converts it to an HBITMAP.
The problem: A Bitmap, with a size that is much smaller than the container used to show it, is blurred and the otherwise sharp edges of the well-defined areas of color are unceremoniously blended. This is just the result of a Bilinear filter applied to a really small image (a few pixels) when zoomed in. … Read more