I am trying to create an image from an array of bytes stored in a base64binary dataset field and I keep getting the same error: System argument exception. Invalid parameter used. The field definitely contains an image because it is obtained from an image file and placed into the database. The e...more >>

Happy New Year! Just recently, I tried my hand at some GDI+, starting slowly, and I'm having some trouble now. I tried just a few drawings in a window, and some other stuff, which wasn't too hard, but now I'm wanting to create a program that will allow me to: 1) Select a button from a too...more >>

I have a bitmap and a graphics object wraped on it When I use MakeTransparent on the bitmap, the graphics object dont draw on it anymore.. I have to recreate the graphics from the bitmap. Anyone can explain this? Thank, Crirus ...more >>

Hi, Hope someone can help me on this. I like to make an own ASP.NET charting control, so I need to render some graphics in a custom made control. I already found this example: protected override void Render(HtmlTextWriter output) { Bitmap objBitmap = new Bitmap(200,200); Graphics ...more >>

Every time I load a nice-looking Windows XP Icon into my VB.NET Imagelist, it turns out ugly and jagged around the edges. I believe this is from the Alpha pixels being mapped to mask pixels instead of keeping their alpha transparency value. The ImageList is 32bbp with a size of 16x16. So, ...more >>

How would I go about getting a screen grab of my entire application (it's parent form) programatically without using the Clipboard? Thanks! James Hancock ...more >>

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I am mainly learning and wanted to develop a simple control - like the panel control, but want to make custom borders. Now the easy way is to simply use the controlpaint.drawborder, but this draws in the user area and not the non-client area, thus not giving the same effect as Microsofts panel cont...more >>

Hello I have a square area to draw on... I have a GraphicsPath that define the region of clipping so the draw occur only on that region The region is one or more circles The problem I'm facing with is drawing a wraped region... I can have one circle falling outside one side of the drawing su...more >>

Hi! I just made a test on graphicsPath I added 3 circles to a GraphicsPath and filled with one color into a panel paint event.. What I noticed is that the overlapped part of 2 circles is not filled as it is not inside the path... How can I add multiple closed figures as circles to a GP a...more >>

Hi, Does anyone knows how to fix following problem: I've created a printpreview with the printpreview control. This looks perfect but the printresult is different from the preview. I tested the program with a HP Deskjet 895CXI (win xp) and a HP Laserjet 4L (win2k) and on those two printer...more >>

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Hi, It seems that nobody talk about this problem before. So it may be a problem of mine. When I use the void Graphics.DrawImage(Image image, Rectangle destRect, Rectangle srcRect, GraphicsUnit srcUnit ); if the size of the srcRect is different from the destRect I must reduce ...more >>

I hope I can explain this right. I found some VB.NET code (converted from a C# program) that uses Windows Image Aquisition to scan images from an attached scanner. It only works in Windows 2000 and XP. The code copies the bits from the scanner to an array and then overrides the form's paint eve...more >>

can i use GDI+ to draw a line ( for example ) on a web page ( or a web form ) ? thanks for any help telbana2@yahoo.com...more >>

I want to resize bitmap use old bitmap coordinate using C# for example. i want to get old bitmap (25,25) to (100,100) this rectangle to place on the new bitmap then return the new bitmap. is it possible to do it? Any one can help me? thx...more >>

I think what I am encountering is a bug, how can I report it to Microsoft? The problem is here: Intersect method of a Region means to update the region data with its intersection with another Region, GraphicsPath, Rectangle, or RectangleF. If the second object is totally inside the reg...more >>

I have all points that are inside a region But they are a lots of points there... how to convert them to a region as GraphicsPath that can be shrinked to a graphicsPath points and types..I need the smallest string that reflect the region -- Cheers, Crirus --------------------------...more >>

Hello, I'm having trouble to get the 2nd parameter of DrawReversibleFrame (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html /frlrfsystemwindowsformscontrolpaintclassdrawreversibleframetopic.asp) working. When setting that color most of the times it doesn't use the ri...more >>

Hi All! I am implementing drag and drop for a PictureBox control in my application. Basically, on the mousedown event for my control I do something along these lines (what follows is just the essential stuff, oh and I'm using c#): DragDropEffects myEffect = myPictureBox.DoDragDrop((Bitmap)...more >>

How can I store images in a dataset? I have a column 'Thumbnail' with object as datatype, but how do I store the images there? db ...more >>

hi. I am a bit new to graphics programing. I am trying in vb.net to make a 3 walled structure which'll give the look of 3d. for that purpose, I am using same rectangle filled with textured brush for 3 walls. For the center wall rectangle is to be drawn as is. For the side walls,I need a prespec...more >>

Hello. I created a VB.Net (framework version 1.1) application that runs on Win 98, 98SE and XP. The problem is that printing does not work on 98SE with the HP Deskjet 1120c printer. The print preview and print both cause what seems to be an OS error message indicating that the application cau...more >>

I need a easy way to store in the most compressed format a graphic path formed from multiple circles That is, eventualy, a string... I need that string to be converted back to a graphics path later... Any thoughts? -- Cheers, Crirus ------------------------------ If work were a g...more >>

Hello all.. I am trying to figure out why I can't fill a rectangle that has negative height/width, but I can with an ellipse: private void Form1_Paint(object sender, PaintEventArgs e) { Graphics loGraphics = e.Graphics; RectangleF loNegRect = new RectangleF(50, 50, -40, -40); lo...more >>

Hi, i load an image and manipulate it. How can i get it to an byte array to store it to a blob field of a database? Thank you! Dirk...more >>

Hi, in VB.NET i am looking for the possibility to increase size of an bitmap by adding white regions e.g. on top and bottom. (I load an image having 400x300 Px from file and want to add white stripes to change size to 400x400 Px.) Thank you! Dirk...more >>

Hello, I'm developing an application that produces some images in black and white, but my code creates a 32 bit image. From what I've read the Graphics object will only draw on 32 bit images. However, once I'm done drawing on the bitmap I would like to reduce this to 1 bit before saving. ...more >>

I have a form that I am drawing text onto in the top left corner. The problem is when I drop a label or even a button and make the background color transparent it shows the text that I have drawn in the label even if the label is somewhere else on the screen. It appears it draws the back...more >>

Hai Everybody, I faced the following error when i browse my web application in windows xp. Parser Error Message: The type initializer for "System.Drawing.SafeNativeMethods" threw an exception. Source Error: Line 140: <asp:datagrid id="DGCompanyList" tabIndex="1" Width="95%...more >>

When I draw a line on a control (say a Panel) using Graphics's DrawLine(new Pen(Color.Red, 1), x1, y1, x2, y2) method, it draws the line with Red color erasing the previously drawn shape(s) along the line on the Panel. I want to draw the line such that the drawing color on a particula pixel...more >>

Hi All, When running the following code: '************************************************ Dim ColorDB As New ColorDialog() ColorDB.ShowDialog(Me) '************************************************ I sometimes (roughly half of the time) get the following error: **********************...more >>

I have a 2d array of integers and would like to 1) convert this to an RGB image; and 2) convert this to a Grayscale image; that has as many pixels as the size of the array and in an arbitrary format. Does anyone know have any examples of how to do this? Thanks....more >>

I use the Bitmap.Save method to save a bitmap image as Gif format. I found the size of the file is more larger than the image after saved by ACDSee without quality lost. How to perform the gif image optimization. ...more >>

Looking for a mapping control to allow plotting of lat long points and doing various zooms and pans for a given region. ...more >>

Hi I'm wondering whether is existing any working way of getting real metrics about the active ContextMenu. For example ContextMenu(.net) expose window handler which I tried to use in GetWindowRect call - failed result; Next i tried to get its DC - failed result too. Finally I tried to get so...more >>

Hi (again), i (still) try to draw a string with heading and trailing spaces with an underlined font. Font font = new Font("Tahoma", 8, FontStyle.Underline, GraphicsUnit.Point ); g.DrawString( " A B ", font, textBrush, 0, 0, format ); but it seems that the function cuts the spaces away. But...more >>

I am writting a scanning module into an application that allows for cropping. I built a custom select box that draws as you mousdown+mousemove (just like the windws explorer drag select effect). To draw the box itself, I am using a graphics object taken from my Picturebox and calling g.drawrecta...more >>

Hello. I am exploring .NET programming using C# and GDI+. My end program is going to be a vector drawing program (similiar to Adobe Illustrator, although not that complex). I've started learning about GDI+, and it seems to have all the functions I want (alpha, gradients, beziers, antialiasing...more >>

I have a MDI application - I want to be able to drag MDIchildren around in the MDIparent, but for the dragging process, I want to draw an outline rectangle of the MDIchild form, and move the outline around, not the MDIchild form itself. The MDIchild's location will be set to where the outl...more >>

I'm trying to print a form by raising the InvokePaint method for the controls on the form. The problem is all controls print at the location 0,0 (ie the top left corner of the form). To test what was happening I created a form containing a checkbox, a picturebox and a button. I placed the ...more >>

Hi In VisualBasic.net 2003, I have drawn graphics to a picturebox using drawline etc... I now want to put that in the clipboard. I think I have to convert it to a bitmap file first, but I can't figure out how to do that or do something more direct. Any help? ...more >>

Ahoy, Folks! I've been trying to track down a problem we've been having with rendering a semi-opaque rectangle in the Graphics object within a PagePrintEventArg parameter that is presented to us in the PagePrintEventHandler we've written. It's difficult to determine the extent of the proble...more >>

I have a web site that allows users to view images. Since the images are higher quality (not our best images) we want to prevent users from getting a clean copy. So I adapted some code to overlay the word Copyright on the image, before it is streamed out to the user. This works, but the string is...more >>

I am using GDI+ to save a PNG image to stream and send to client's IE. PNG image should have the same quality as BMP. But, I find that there is light gray edge on PNG image shown in IE. Other than that, the image is the same as bitmap image. If I save the same image to stream as BMP image, then...more >>

i have form1 and form2, form1 has a picturebox which i already drew something on it(e.g. rectangle) i active form2 to chose another shape to add below the rect, after form2 closed, the new shape should be added below the rect and the rect should be remained in its original position on the p...more >>

Hi, When I first installed Visual Studio 2003, I noticed I was getting the following error when showing a form: A first chance exception of type 'System.ArithmeticException' occurred in system.drawing.dll Additional information: Overflow or underflow in the arithmetic operation It is bei...more >>

I use a bitmap as double buffer to draw a big control I'm wandering wich pixel format will help me to speed up the drawings .. I dont use many colors, because I save the images used in best compresion jpeg mode that Photosop knows -- Cheers, Crirus ------------------------------ If ...more >>

Hello Gurus :), We have a .NET desktop application which runs on various win98/ME/2000/XP computers with various printers. ..NET printing seems to be very unstable, and stability on Win 98/ME platforms is at unacceptable level. On Win 98/ME printing or print preview crashes on a wide range of...more >>

I have a form on which I've placed a TabControl which contains two TabPages. When I resize my application, the TabControl flickers. I've read a number of posts that say to stop this you should derive from the control in question, in this case TabControl, and in your new sub-class, call SetSty...more >>