On Wed, 2007-02-28 at 15:34 -0500, Abe Gillespie wrote: > Have you tried the DrawToBitmap method?
Nice one, but 2.0 and not yet implemented in Mono. > -Abe > > On 2/28/07, Eric Morgan <[EMAIL PROTECTED]> wrote: > > The problem isn't resizing - I don't have an original bitmap to resize. The > > problem is that I have a control that I want a screenshot of. So, I'm > > trying to create a Bitmap from whatever is appearing in the control. > > > > I pass the control in, then I call control.CreateGraphics(); > > System.Drawing.Graphics g1 = c.CreateGraphics(); > > > > Then, with the resulting graphics object, I try to create a new bitmap. > > Bitmap MyImage = new Bitmap(w, h, g1); > > > > The thing is, this bitmap is blank, unless I paste back in that BitBlt code. > > I can't figure out how to get a new bitmap from a graphics object, without > > BitBlt(). > > > > Sebastien - Using 2.0 isn't an option, unfortunately. > > > > Is there any alternative from P/Invoking in this case? > > > > Thanks for all the help! > > > > Eric > > > > > > On 2/28/07, Abe Gillespie < [EMAIL PROTECTED]> wrote: > > > It looks like you're just taking the image and resizing it to show in > > > the dialog. You really should not have to go into native OS libraries > > > to do so. Does this site help? > > > > > > http://www.peterprovost.org/archive/2003/05/29/516.aspx > > > > > > -Abe > > > > > > On 2/28/07, Eric Morgan <[EMAIL PROTECTED]> wrote: > > > > I'm not too sure how to get a Bitmap object from a graphics object. > > From > > > > all I've read, I just hear that you have to deal with device contexts. > > I'm > > > > not too familiar with it, but BitBlt seems to be the way to do that. > > What > > > > would I need to do to get that bitmap created with what appears in the > > > > control using 100% .NET so it can run in mono? Here's a snippet of > > code. > > > > > > > > > > > > > > [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")] > > > > private static extern bool BitBlt( > > > > IntPtr hdcDest, // handle to destination DC > > > > int nXDest, // x-coord of destination upper-left corner > > > > int nYDest, // y-coord of destination upper-left corner > > > > int nWidth, // width of destination rectangle > > > > int nHeight, // height of destination rectangle > > > > IntPtr hdcSrc, // handle to source DC > > > > int nXSrc, // x-coordinate of source upper-left corner > > > > int nYSrc, // y-coordinate of source upper-left corner > > > > System.Int32 dwRop // raster operation code > > > > ); > > > > > > > > > > > > public static Bitmap PerformCapture(Control c, int maxWidth, int > > > > maxHeight) > > > > { > > > > try > > > > { > > > > int w = c.ClientRectangle.Width; > > > > int h = c.ClientRectangle.Height; > > > > > > > > w = System.Math.Min(w, maxWidth); > > > > h = System.Math.Min(w, maxHeight); > > > > > > > > System.Drawing.Graphics g1 = > > > > c.CreateGraphics();//this.CreateGraphics(); > > > > Bitmap MyImage = new Bitmap(w, h, g1); > > > > System.Drawing.Graphics g2 = > > > > System.Drawing.Graphics.FromImage (MyImage); > > > > IntPtr dc1 = g1.GetHdc(); > > > > IntPtr dc2 = g2.GetHdc(); > > > > BitBlt(dc2, 0, 0, w, h, dc1, 0, 0, 13369376); > > > > g1.ReleaseHdc(dc1); > > > > g2.ReleaseHdc(dc2); > > > > > > > > //Separate dialog to display the image. If I comment out the BitBlt > > code, > > > > it just appears blank. > > > > > > Library.Windows.Dialogs.ScreenCaptureDlg > > > > dlg = new > > > > Library.Windows.Dialogs.ScreenCaptureDlg(MyImage); > > > > dlg.ShowDialog(); > > > > > > > > return MyImage; > > > > } > > > > catch(Exception error) > > > > { > > > > //our exception handling library. > > > > Library.Common.ErrMsg.Err( error ); > > > > throw error; > > > > > > > > } > > > > } > > > > > > > > > > > > > > > > On 2/28/07, Abe Gillespie <[EMAIL PROTECTED]> wrote: > > > > > Are you P/Invoking for performance? Why not just use the GDI .Net > > API? > > > > > > > > > > -Abe > > > > > > > > > > On 2/28/07, Eric Morgan <[EMAIL PROTECTED]> wrote: > > > > > > Hi all, > > > > > > > > > > > > Is there a good way to capture screens or something similar in mono? > > In > > > > our > > > > > > .NET application, we have custom controls, and we basically create a > > > > > > graphics object from it, make a new bitmap, then do a bitblt to get > > it > > > > into > > > > > > the bitmap. This requires a P/Invoke into gdi32.dll , which > > obviously > > > > blows > > > > > > up in mono. Is there a good way to do this using mono? Some other > > > > library > > > > > > maybe? > > > > > > > > > > > > I've tried installing wine and using the gdi32.dll.so that comes > > with > > > > it, > > > > > > but I don't know if I'm using it correctly or not. It can find the > > > > library, > > > > > > but it gives a SIGSEGV while trying to execute the bitblt operation. > > > > Seemed > > > > > > like kind of a hack, and I didn't really expect it to work... Do I > > need > > > > > > other libraries along with the gdi32.dll.so ? > > > > > > > > > > > > Any advice is appreciated. Thanks. > > > > > > > > > > > > Eric Morgan > > > > > > Renegade Geophysics > > > > > > 303-661-0400, x2 > > > > > > > > > > > > _______________________________________________ > > > > > > Mono-list maillist - [email protected] > > > > > > http://lists.ximian.com/mailman/listinfo/mono-list > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > Mono-list maillist - [email protected] > > > > http://lists.ximian.com/mailman/listinfo/mono-list > > > > > > > > > > > > > > > > > > > > _______________________________________________ > > Mono-list maillist - [email protected] > > http://lists.ximian.com/mailman/listinfo/mono-list > > > > > _______________________________________________ > Mono-list maillist - [email protected] > http://lists.ximian.com/mailman/listinfo/mono-list _______________________________________________ Mono-list maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-list
