Taking screenshot behind the form using magnification

[Zacherl]

Zitat von victorlus:

So in my case I can not hide the form, I need to make it visible to the client all the time

Could you please explain what EXACTLY you are trying to achieve? There might be an easy way to work around that problem. The magnification API is a hack .. I remember reading the article you linked in your original post. The author stated that it is not possible to obtain a bitmap from the maginification window and thats why he used the (deprecated) callback to manually save the bitmap.

I guess the magnification API uses DirectX to paint the screenshot, so you might be able to intercept that process by hooking some DirectX interfaces, but thats hacky as well.

[victorlus]

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

[Rollo62]

Are you looking for hidden changes behind the form ?
I'm afraid Windows won't update the hidden regions at all, for a good reason: Performance.
They only might get updated when these regions get visible.

Rollo

[Zacherl]

Zitat von victorlus:

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

Yeah I understood that, but WHY do you want to do that?

[victorlus]

Zitat von Zacherl:

Zitat von victorlus:

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

Yeah I understood that, but WHY do you want to do that?

I need to do this, to monitor what's behind the form
My program will work this way, visible to the client all time, I can see what is behind the form

[Zacherl]

Zitat von victorlus:

Zitat von Zacherl:

Zitat von victorlus:

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

Yeah I understood that, but WHY do you want to do that?

I need to do this, to monitor what's behind the form
My program will work this way, visible to the client all time, I can see what is behind the form

Mhh sorry, I guess I cant help you with that. Not sure whats the purpose of such a program. You could use PrintWindow for specific windows (you might even be able to compose your own "desktop" by iterating through all visible windows). This should work for background windows, but might not work for minimized ones.

[EWeiss]

Zitat:

This should work for background windows, but might not work for minimized ones.

NO that not work.

Zitat:

The PrintWindow function copies a visual window into the specified device context (DC), typically a printer DC.

The Desktop is not a real Window.
And PrintWindow works only for the own Window (or within active Desktop), you can not capture the Background from Desktop that Fails.

and i have tell forget it without minimize, or hide your Form.

nobody can help for that.
but here is what you can see behind the form.

greets

[HolgerX]

Hm..

1.) It is possible to make a ScreenShot without the foreground Application!

2.) The DESKTOP is a Window! It is the Mainwindow of an 'Explorer' instanz, in older Windowsversions 'Progman'!

I made a small demo, where i use PrintWindow!
(Test_ScreenShot_BackGround.zip)
It is made with Delphi 6 and goes to all Apps in Z-Order, starting with the last (Desktop!).

I have tested it in Windows8.1 (Classic Shell).