how to draw image directly onto screen

[myjpa1]

Hi, all,

I want to draw image directly onto top of screen, which simulates the
OSD(on screen display) effects. However, class Graphics must link to
certain controls, that cannot be used to draw at an arbitary position.
Does anyone know any approaches can perform this job?

thanks,

 

[Nicholas Paldino [.NET/C# MVP]]

You should be able to call the GetDesktopWindow API function through
PInvoke. With that handle, you can then get the device context for the
window (through GetDC I believe). Then, you can pass that device context
handle to the static FromHdc method on the Graphics class to get a Graphics
instance to draw with.

However, you will have to be careful of refresh issues.

Hope this helps.

 

[myjpa1]

Paldino,

Thanks for your reply. I'll have a try at once

You should be able to call the GetDesktopWindow API function through
PInvoke. With that handle, you can then get the device context for the
window (through GetDC I believe). Then, you can pass that device context
handle to the static FromHdc method on the Graphics class to get a Graphics
instance to draw with.

However, you will have to be careful of refresh issues.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hi, all,

I want to draw image directly onto top of screen, which simulates the
OSD(on screen display) effects. However, class Graphics must link to
certain controls, that cannot be used to draw at an arbitary position.
Does anyone know any approaches can perform this job?

thanks,