copy contents of CDC to gdi + graphics object

Question

Hi all
Please help me for this---

In my project all drawing operations are done by using CDC object.
CDC stretchBlt , BitBlt like functions are used.
I want to copy contents of this on GDI+ Graphic object created using Bitmap.
I tried following code, but its not woking
Can anyone help me.......????????

sDC = GetDC();

Bitmap* scrollBitmap = new Bitmap(680,768,PixelFormat32bppPARGB);

   Graphics gr(scrollBitmap);
   HDC hdc = gr.GetHDC();

CDC *gDC = CDC::FromHandle(hdc);

sDC is original Dc on which all drawing is done.

i have created new CDC gDC- which is created by using Graphics object

I tried to use dtatement gDC->StretchBlt(destination gDC,-,-Source is SDC);

but this is not working, nothing on BITMAP....

Please help me what can i do for this

Kirtan Patel · Answer

In this matter its Better to ask Mr Mahesh Chand the Owner of the Site they and they are Author of GDI + Book so better to ask them they will guide you better then anyone else here :)

jinge · Answer

I would suggest you redesign your application with pure GDI or GDI+. This will also make your application less bug and statable and easy to extend. Any way if you found my post was helpful don't forget to mark Do you like this answer?. Thanks.

sheetalw wattamwar · Answer

ok... but actually i have to combine these 2 or I need to redesign my application with GDI+ will waste my couple of months...:(

jinge · Answer

Then I am not sure. But in my opinion mix gid with gdi+ is not recommended. GDI is typically more efficient then GDI+ when doing certain type job. So I suggest you do the job with pure GDI or pure GDI+. Don't mix them.

sheetalw wattamwar · Answer

hi thanks for reply but I did it already but there is a problem.... My drawing on CDC is in a loop like some text is scrolling on screen..... this is pixel by pixel drawing..... when i use this temp bitmap for drawing becomes very very slow. and application gets crash randomly. do u have any other solution do you know why this gDC is not linked with graphics object. or Bitmap?

jinge · Answer

Use a temp bitmap as a brige first copy the content of the CDC to a temp bitmap and invoke DrawImage method of the Graphics object to draw the temp bitmap.