gdi

I've been attempting to draw on an 8bpp grayscale bitmap without success. Here are some of my attempts. Maybe someone can point out what I'm doing wrong. =================================================== Attempt 1: Create, select, and draw: In constructor: CBitmap bm; bm.CreateBitmap (200, 200, 1, 8, NULL); In OnDraw: CDC *mdc=new CDC (); HGDIOBJ tmp = mdc->SelectObject(bm); Result: tmp is NULL, indicating failure. =================================================== Attempt 2: CreateDIBSection In constructor: HBITMAP hbm; BITMAPINFOHEADER bih; BITMAPINFO bi; HANDLE hb; CDC* myDc = new CDC ()

I'm trying to draw on the screen (the whole screen, on top of every other window) using GDI+. I've passed NULL to GetDC to get a HDC to the screen, and then used that to create a Graphics object, and used DrawRectangle to draw rectangles on the screen. Everything works..except...the inside of the rectangle won't update. Like if I draw it over a command prompt, and move the command prompt, the inside of the rectangle remains black. I expect to see whats under the rectangle. Here's the code that's doing the drawing.. Pen BluePen(Color(255, 0, 255, 0), 2); Graphics graphics(screenDC); graphics

How do you create a 1 bit per pixel mask from an image using GDI in C#? The image I am trying to create the mask from is held in a System.Drawing.Graphics object. I have seen examples that use Get/SetPixel in a loop, which are too slow. The method that interests me is one that uses only BitBlits, like this . I just can't get it to work in C#, any help is much appreciated. Try this: using System.Drawing; using System.Drawing.Imaging; using System.Runtime.InteropServices; ... public static Bitmap BitmapTo1Bpp(Bitmap img) { int w = img.Width; int h = img.Height; Bitmap bmp = new Bitmap(w, h,

What I've done I have a small template image which is meant to be used to find coordinates of matching subimages within a larger screenshot image. The screenshot itself is captured into a memory DC with the help of BitBlt , then converted into a cv::Mat via GetDIBits , like so: HDC windowDc = GetWindowDC(hwndTarget); HDC memDc = CreateCompatibleDC(windowDc); // ... HBITMAP hbmp = CreateCompatibleBitmap(windowDc, width, height); SelectObject(memDc, hbmp); BITMAPINFOHEADER bi = { sizeof(BITMAPINFOHEADER), // biSize width, // biWidth -height, // biHeight 1, // biPlanes 32, // biBitCount BI_RGB, /

My GDI program runs fine on Windows XP but on Windows Vista and 7 it looks pretty terrible due to the lack of GDI hardware acceleration. I recall reading an article a few years back saying that Windows 7 added hardware acceleration to some GDI functions, including BitBlt() function. Supposedly, if you if you draw to a memory bitmap and then use BitBlt() to copy the image to your main window it runs about the same speed as XP. Is that true? If it is true, how do you do it? I'm terrible at programming and am having a bit of trouble. I created the below class to to try and get it working: class

Please help! I'm really at my wits' end. My program is a little personal notes manager (google for "cintanotes"). On some computers (and of course I own none of them) it crashes with an unhandled exception just after start. Nothing special about these computers could be said, except that they tend to have AMD CPUs. Environment: Windows XP, Visual C++ 2005/2008, raw WinApi. Here is what is certain about this "Heisenbug": 1) The crash happens only in the Release version. 2) The crash goes away as soon as I remove all GDI-related stuff. 3) BoundChecker has no complains. 4) Writing a log shows

Question: Is there an easy way to get a list of types of resources that leak in a running application? IOW by connecting to an application ? I know memproof can do it, but it slows down so much that the application won't even last a minute. Most taskmanager likes can show the number, but not the type. It is not a problem that the check itself is catastrophic (halts the app process), since I can check with a taskmgr if I'm getting close (or at least I hope) Any other insights on resource leak hunting (so not memory) is also welcomed. Background: I've an Delphi 7/2006/2009 app (compiles with all

[ExternalException (0x80004005): A generic error occurred in GDI+.] IpitchitImageHandler.Data.ImageRepository.AddNewTempImage(Stream image, String extension, Guid PageId, Guid ImageId, ImageTransformCollection toDoTransforms) +1967 IpitchitImageHandler.Data.ImageRepository.AddNewTempImage(Stream image, String extension, Guid PageId, Guid ImageId) +85 IpitchitWeb.Sell.Controls.UploadImagesSubstep.UploadImages(Object sender, EventArgs e) in F:\Documents and Settings\Vjeran\My Documents\Visual Studio 2008\Projects\Ipitchit\IpitchitWeb\Sell\Controls\UploadImagesSubstep.ascx.cs:88 System.Web.UI