Hi, I'd like to know if there's a way to identify a file as a valid bitmap which can be loaded with the public Bitmap(string filename) constructor. Should I test filename's extension or is there a way to check the header ? Maybe there's a function which gives me supported extensions so I won't...more >>

I'm releasing a tool soon that works with GDI+. One of the features is the ability to import images and produce code. I've identified 4 ways that a project could get at images. 1) Build action embed 2) Build action content 3) A relative path to the image from the /bin 4) An absolute pa...more >>

I'm working on some GDI+ code to bring a JPG into a bitmap and dynamically draw a frame and dropshadow around it. I've got the image loaded and scaled such that I have room, and can do the frame, but the dropshadow is, invariably, just a black bar on the right and bottom of the image. Of cours...more >>

Hi, I am writing a graphing application that needs to have multiple instances of custom graphs written vertically. I then need a governer that can interact with all the graphs by drawing a vertical line to line up the graph points. My basic question is I need to draw something on top of...more >>

I need to create a fax cover page. For this I am creating a bitmap image doing the drawing on it and then converting it to tiff format. I am have a problem with getting the size of the image correct. I need two sizes for starters, legal and letter. When creating new bitmaps you can set the ...more >>

hi i want to put several pictureboxes onto each other, so i get layers made of pictureboxes. the most part of a picbox should be transparent, so that only the drawings occlude the picboxes behind it, and where a picbox is transparent, the drawings on the picboxes behind it are visible. I...more >>

Windows GDI has support for multiple display monitors. Where are comparable facilities in the .NET Framework Class Library. What are the C# bindings?...more >>

Hi all. I realize this MeasureString topic has been tossed around quite a bit but I can't seem to make it work well despite trying out all the postings. I implemented all I tried in the little function at the end of this posting. I've been trying to create some text separated into c...more >>

I have been doing some simple tests, based on the code given in the MSDN example, with additions to select any of the printers available on my machine. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDrawingPrintingPrintDocumentClassTopic.asp Everything...more >>

Hi NG I get allways a OutOfMemory-Exception, when I would get a Graphics-Object, but it could not be right. When I try with this.Handle it is all ok. When I try with a Handle from Spy++ I get a OutOfMemory-Exception. What could be wrong? Thomas Bock ...more >>

In Visual Studio 2003 I make a new icon file. By default it shows a 32 x 32 icon which I'm not using. So I make a new 16 x 16 icon and save it. The 16 x 16 icon works fine. On the next day I start up VS and go to the icon file. By default it shows a 32 x 32 icon. But I can't figure out ho...more >>

Hi All, Following on from a conversation with John from MSFT below, are there any cards that support GDI+ acceleration? And more importantly how is this possible? -- Snooping around Google I found this link with a comparison table http://www.digit-life.com/articles/triplexxabre/ Inside t...more >>

I have been struggling with this for over a week now. Here's what I need to do: 1) Load an image into a picturebox control. 2) Draw a transparent box with a colored border on top of the image. 3) Be able to click anywhere in the image and "move" the box to the mouse coordinates. Step 1 is...more >>

Hi all, I am very new to programming and C# and had a few questions about bitmaps and drawing them to the screen. Question 1: When creating a Bitmap object from a file, does it keep the file open for the life of the object or does it just store it in memory. If it does keep the file open,...more >>

Anyone know how to create and draw on top of a transparent window? I tried specifying a transparent color for the form but any antialiasing blends with the designated transparent color rather than the desktop. I thought using NativeWindows might be the solution but I haven't been able to find...more >>

I've just spent 2 days figuring this out, so I figured I'd post this to help anyone going through a similar issue. My problem was that I wanted to create a control that used double buffering to eliminate flickering when it paints itself to the host form. To do this, I added the following to...more >>

Although PrinterSettings is marked as [Serializable] attribute, when I call Serialize() of BinaryFormatter or SoapFormatter(), it raises an exception. System.Drawing.Printing.TriState is not marked as serializable. at System.Runtime.Serialization.FormatterServices.InternalGetSerializableM...more >>

Hi, I'd like to find out the properties of a TIFF. For example, its color(B/W, grayscale, color etc) , its compression and resolution. Any idea on how to go about this. Any pointers will be helpful. Thnaks, Sankalp ...more >>

There is no way to extract an EnhancedMetafile: with object o = d.GetData(DataFormats.EnhancedMetafile); I always obtain an object null reference to "o". Someone knows why this appens? There is some way to bypass this problem? Thanks in advance ...more >>

Hi, I 'm trying to get the metadata from a JPG image (created by a digital camera). When I use 'Image.PropertyItems' I only get 2 property-items.0x5090 and 0x5091... I know there are a lot more tags, when I look with IrFanView or with the windows explorer under Windows XP I see there is ...more >>

Hello NG, Does anyone know how to read .WIT files? Apparentley the are some sort of thumbnail type images but I cannot find details about them anywhere. Many thanks Alan. ...more >>

I need to write a service which will monitor a database and generate an image to be faxed to a customer. I'm generating an image because this service won't do the faxing itself, but rather will write some information into another table which is processed by a program that does the faxing. This s...more >>

All, I have written a desktop app which takes a Base64 encoded Stream and creates an image from it. The data in the stream represents a JPG or GIF image which is best in my case for size (versus BMP). The problem I'm having is that the Compact Framework doesn't support the APIs I'm using i...more >>

I call this routine repeatedly: public void LoadImage(string filename) { Image img=Image.FromFile(filename); pictureBox1.Image=img; img.Dispose(); } if I dont call dispose it gets error when I call dispose it gets sharing "filename" error. Please help...more >>

Is there a way to prevent the entire jpeg from being loaded into memory to read an EXIF value from the file? GDI+ seems to load the whole image into memory to get this value. here is some code snippet: Dim s As New FileStream(p, Filemode.Open, FileAccess.Read) Dim image As New Bitmap(s) ...more >>

I have created a windows application with Visual Studio .NET 2003, using C#. It saves data to SQL2000 in 10 fields, from information taken from a Metal Manufactures Certificate, which also has to be saved to disk from a Twain Scanner. How can the Twain Scanner be accessed from the Windows ...more >>

Hi, any equivalent function for CWnd::ScrollWindow() in C# forms or .Net warm regrads sk ...more >>

When designing my application I encountered no problems with my print code. I used VB.NET on an Win XP machine, I used .NET 1.0. When the application was installed on a Win 98 machine I received a NullPointerException error when trying to print a PrintDocument object or preview it with a ...more >>

I have a windows service that is written in VB.Net. This service needs to use funtions in GDI+. Of course I get an error since it can not interact with the desktop. Other post have said to allow the service to interact with the desktop, however this service can not run as LocalSystem. It n...more >>

I have the following code to extract a bitmap from a resource dll (standard, not .NET satellite): public static Bitmap GetBitmap(string shellPath, int id) { System.IntPtr hModule = Kernel32.LoadLibraryEx(shellPath, System.IntPtr.Zero, Kernel32.LOAD_LIBRARY_AS_DATAFILE); System.IntPtr hBi...more >>

I have some weird things going on. I get an 'Overflow or underflow in the arithmetic operation.' message when printing to a Samsung printer (ML-1200) or any other printer that is not the default printer. (If I have the Samsung as the default I get the message.) Other printers do not give ...more >>

Hi How do I get toolbars and menus to show the 32b color depth version of my icons? I store my icons as embedded resources and load them from the manifest resource stream. If the .ico file has a 32b color version, the icons always appear corrupted; if they only have a 256 color version in t...more >>

I am working on MJPEG programming to reduce the size, pixel and resolution of the input MJPEG file from my video streamer. Wondering if there are any existing codes that can help me out in these area. I will be using Visual C/C++ to do the programming. Thank you *** Sent via Developersdex h...more >>

I tried loading a 32-bit argb bitmap, and it gets loaded as 32bit rgb without the alpha information. What gives? How can I get it to load as a 32-bit argb? Thanks Ray ...more >>

I do not know what I did to get this condition and hope that someone can shed some light on it. As of late I get a System.ArithmeticException raised by the System.Drawing module. Steps to getting the exception in VS.Net 2003 (and VS.Net 2002): If I run an empty form I do not get the exc...more >>

Sorry for many posts about the same topic, but i cant get this working i have been reading many articles about image processing and they are all writed in C#, i was able to get them working, and i dont know nothing about C#, i just did a copy/paste my problem now is that i cant convert them to my...more >>

Hi. How can i select *.jpg and *.gif files from a dir?? I'm using this: Directory.GetFiles(PathVar, "*.jpg") but i don't know how to get more extensions than *.jpg Thank you ...more >>

If I load a picture from file into a VB.net picture box image, I can save it as another file name. If I try to save the picture box image back to the same path and file name that was loaded, I get an error. Can you tell me how to fix this, please? ...more >>

Hi All, I know I can set a form Opacity and set the TransparencyKey properties but I need to get a combination of the two where I can "see"(click through or other mouse events) through a hole or shape in the form where the hole has an opaque colour and is not completely transparent, like a fil...more >>

For instance, if the stream Length is 300K, after I call this method, the memory usage increase 2000K. Is this normal??? Thank you ...more >>

Folks, I've been running into problems with a multipage Tif viewer that I wrote to display fax images in an ASP.Net app. I've been basically following the standard examples on how to do this: - Read the image from a file - set the active frame (for the requested page in the Tif) - write th...more >>

How can i create a Bitmap from a rawbuffer-BYTE* (from framegrapper). I do following: Bitmap *myBit2 = new Bitmap(wImage,hImage,wImage*sizeof(BYTE),PixelFormat::Format8bppIndexed ,(IntPtr)pbyteBuffer); pictureBox->set_Image(myBit2 ); the Bitmap were not correct displayed MFC Soja ...more >>

I have PNG image. I want to draw something on it. The problem is that the image has pixel format of PixelFormat1bppIndexed. So the following call fails. Graphics *pG = Graphics::FromImage(&srcImage); Is there a way to overcome this issue? Thanks ...more >>

I have a big problem with .NET. I know that this problem is already treated in the Microsoft Knowledge = Base Article - 326219 http://support.microsoft.com/default.aspx?scid=3Dhttp://support.microsoft= ..com:80/support/kb/articles/q326/2/19.asp&NoWebContent=3D1 but the solution which is provi...more >>

Hi all, I'm in a rut with a project I'm working on. I'm building a shortcut bar much like the one in OS X, basically a transparent panel with fully opaque bitmaps (with alpha transparency support) that grow/shrink etc much like this screenshot: http://www.dca.net/support/images/osxscreen1....more >>

Hi All, I want to use Matrix(Rectangle, Points[]) to build a transformation that will set the origin to the lower left corner. The form size is: 500,500 pixel but in world unit I set width = height= 500 (so I will a scale (!=1) on both axes). This is the code I wrote (in the form1 construct...more >>

Hello, I am having trouble converting a LOGFONT structure to a System.Drawing.Font object. I'm calling SystemParametersInfo to get the LOGFONT lfntSMCaptionFont from a NONCLIENTMETRICS structure. I seem to be doing this correctly, but when I try to create a System.Drawing.Font object with ...more >>

I am using a specialty (receipt/barcode) printer which has built in fonts (including barcode fonts). I'd like to print to this printer using the built in fonts. They are available via Wordpad, and I can find/select it for printing in VB6 by enumerating priner fonts in the printer object. ...more >>

Hi, I have an ASP.NET page that sends a request to the server to generate some html on the fly and print it through the server. Once the request comes in, the page is generated. I have a Internet Explorer Control that loads this page on the server side. Then I am calling the print function ...more >>

Hi How do we draw text at an angle using Graphics object? Thanks RK ...more >>