Question about win32 hooks.

[Gonen]

Hello ,
I did a program that capture the picture from the clipboard(if there is one)
and saves it into a BMP file.

I want to do now that my program will do it when I press print screen for example
now, I know that I need to read on win32 hooks,
But there is so much information on it,
and I don't think I need all the information on win32 hooks...

Humm,,
Anyone can give me a specific information on which hook I need or something?

or if somebody did something like that before and can write something that will help me , I will be grateful


thanks for the helpers.

[Duthomhas]

Wrong forum.

No need for hooks. You just need to
1) add your window to the clipboard viewer chain (with SetClipboardViewer()),
2) process the WM_CHANGECBCHAIN and WM_DRAWCLIPBOARD messages, and
3) remove your window from the clipboard viewer chain before it is destroyed (with ChangeClipboardChain()).

Here is an example, with nearby links to documentation.
http://msdn.microsoft.com/en-us/library/ms649016(VS.85).aspx#_win32_Adding_a_Window_to_the_Clipboard_Viewer_Chain

Hope this helps.

[Gonen]

but where is the part that I catch when the user presses print screen for example?

[Duthomhas]

Pressing [PrtScr] automatically posts the captured image to the clipboard. If you are a clipboard viewer, you will be notified of the change.