Solved

Screenshot or Alt and Printscreen

Posted on 2001-08-29
4
1,600 Views
Last Modified: 2010-05-18
I want to take a desktop screenshot or simulate alt + printscreen from Delphi 5. Are there any API calls or Delphi code to do this? Thanx, Magnus.
0
Comment
Question by:skynergy
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 14

Accepted Solution

by:
DragonSlayer earned 50 total points
ID: 6435487
didn't try to compile it, but I think it will work:

uses
  Windows, clipbrd;

procedure CaptureScreen(WholeDesktop: Boolean);
var
  Desktop: HWND;
  DesktopDC: HDC;
  FWidth, FHeight, FLeft, FTop: Integer;
  AImage: TBitmap;
  WindowRect: TRect;
  AFormat: Word;
  AData, APalette : THandle;
begin
  Desktop := GetDesktopWindow;

  AImage := TBitmap.Create;
  if WholeDesktop then
  begin
    FWidth := Screen.Width;
    FHeight := Screen.Height;
    FLeft := 1;
    FTop := 1;
  end else
  begin
    GetWindowRect(GetTopWindow(0), WindowRect);
    FWidth := WindowRect.Right - WindowRect.Left;
    FHeight := WindowRect.Bottom - WindowRect.Top;
    FLeft := WindowRect.Left;
    FTop := WindowRect.Top;
  end;

  DesktopDC := GetWindowDC(Desktop);
  try
    AImage.Width := FWidth;
    AImage.Height := FHeight;
    BitBlt(AImage.Canvas.Handle, 1, 1, FWidth, FHeight,
      DesktopDC, FLeft, FTop, SRCCOPY);
    AImage.SaveToClipBoardFormat(AFormat, AData, APalette);
    ClipBoard.SetAsHandle(AFormat, AData);
  finally
    ReleaseDC(Desktop, DesktopDC);
    AImage.Free;
  end;
end;
0
 

Author Comment

by:skynergy
ID: 6435588
Hi there. When compiling I'm geting the following error: "[Error] Functions.pas(1189): Types of actual and formal var parameters must be identical" for "AImage.SaveToClipBoardFormat(AFormat, AData, APalette);".

I have changed the procedure slighty for my needs:

procedure CaptureScreen(csWholeDesktop: Boolean; var csBitMap: TImage);
var
 Desktop: HWND;
 DesktopDC: HDC;
 FWidth, FHeight, FLeft, FTop: Integer;
 AImage: TBitmap;
 WindowRect: TRect;
 AFormat: Word;
 AData, APalette : THandle;
begin
 Desktop := GetDesktopWindow;

 AImage := TBitmap.Create;
 if csWholeDesktop then
 begin
   FWidth := Screen.Width;
   FHeight := Screen.Height;
   FLeft := 0;
   FTop := 0;
 end else
 begin
   GetWindowRect(GetTopWindow(0), WindowRect);
   FWidth := WindowRect.Right - WindowRect.Left;
   FHeight := WindowRect.Bottom - WindowRect.Top;
   FLeft := WindowRect.Left;
   FTop := WindowRect.Top;
 end;

 DesktopDC := GetWindowDC(Desktop);
 try
   AImage.Width := FWidth;
   AImage.Height := FHeight;
   BitBlt(AImage.Canvas.Handle, 0, 0, FWidth, FHeight,
     DesktopDC, FLeft, FTop, SRCCOPY);
 finally
   ReleaseDC(Desktop, DesktopDC);
   csBitMap.Picture.Assign(AImage);
   AImage.Free;
 end;
end;

You wil also notice that I changed all the 1's to 0's because there was a grey line on the left for a whole desktop capture.

Thanx a lot for this code!
Magnus
0
 
LVL 14

Expert Comment

by:DragonSlayer
ID: 6439132
ah, so instead of capturing to clipboard, you actually wanted to save it into a file :)

I would advise putting
  csBitMap.Picture.Assign(AImage);
after the bitblt statement instead of in the finally statement

Oh, and my mistake, I should've put in 0, 0 instead of 1, 1 as the starting point :)



DragonSlayer.
0
 

Author Comment

by:skynergy
ID: 6522737
Thanx for all the code examples!
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question