How obtain a Screenshot on an Windows Service
-2
How i can obtain a screenshot of desktop using a windows service?
i tried the following code who works fine if the application isn't a service, but if are a service return a white picture.
var
LBitmap : TBitmap;
LPngImage : TPngImage;
LDesktopCanvasHandle : HDC;
begin
LBitmap := TBitmap.Create;
LPngImage := TPngImage.Create;
LBytesStream := TBytesStream.Create;
try
LDesktopCanvasHandle := GetWindowDC(GetDesktopWindow);
LBitmap.PixelFormat := pf4bit;
LBitmap.Height := Screen.Height;
LBitmap.Width := Screen.Width;
BitBlt(
LBitmap.Canvas.Handle,
0, 0,
Screen.Width, Screen.Height,
LDesktopCanvasHandle,
0, 0,
SRCCOPY);
LPngImage.Assign(LBitmap);
LPngImage.SaveToFile('C:img.png');
finally
FreeAndNil(LPngImage);
FreeAndNil(LBytesStream);
end;
sockets delphi
asked Nov 23 at 2:58
Pâmella Douglas
676
add a comment |
-2
How i can obtain a screenshot of desktop using a windows service?
i tried the following code who works fine if the application isn't a service, but if are a service return a white picture.
var
LBitmap : TBitmap;
LPngImage : TPngImage;
LDesktopCanvasHandle : HDC;
begin
LBitmap := TBitmap.Create;
LPngImage := TPngImage.Create;
LBytesStream := TBytesStream.Create;
try
LDesktopCanvasHandle := GetWindowDC(GetDesktopWindow);
LBitmap.PixelFormat := pf4bit;
LBitmap.Height := Screen.Height;
LBitmap.Width := Screen.Width;
BitBlt(
LBitmap.Canvas.Handle,
0, 0,
Screen.Width, Screen.Height,
LDesktopCanvasHandle,
0, 0,
SRCCOPY);
LPngImage.Assign(LBitmap);
LPngImage.SaveToFile('C:img.png');
finally
FreeAndNil(LPngImage);
FreeAndNil(LBytesStream);
end;
sockets delphi
asked Nov 23 at 2:58
Pâmella Douglas
676
3
Services run in session 0, which does not have access to the desktop of the current user. That means that you can't useGetDesktopWindow, because you don't have access to it, which means thatGetWindowDCdoes not return a valid DC. Therefore, there is no screen to capture, which explains your results. See stackoverflow.com/q/18891819/62576
– Ken White
Nov 23 at 4:30
Solution can be found here (in C#): stackoverflow.com/a/4147868/800214
– whosrdaddy
Nov 23 at 11:12
What happens when there are 5 different people logged into different desktops concurrently on the same machine? Which desktop do you want a screenshot of?
– Jerry Dodge
Nov 25 at 12:40
A random screenshot are fine.
– Pâmella Douglas
Nov 27 at 21:05
add a comment |
-2
-2
-2
How i can obtain a screenshot of desktop using a windows service?
i tried the following code who works fine if the application isn't a service, but if are a service return a white picture.
var
LBitmap : TBitmap;
LPngImage : TPngImage;
LDesktopCanvasHandle : HDC;
begin
LBitmap := TBitmap.Create;
LPngImage := TPngImage.Create;
LBytesStream := TBytesStream.Create;
try
LDesktopCanvasHandle := GetWindowDC(GetDesktopWindow);
LBitmap.PixelFormat := pf4bit;
LBitmap.Height := Screen.Height;
LBitmap.Width := Screen.Width;
BitBlt(
LBitmap.Canvas.Handle,
0, 0,
Screen.Width, Screen.Height,
LDesktopCanvasHandle,
0, 0,
SRCCOPY);
LPngImage.Assign(LBitmap);
LPngImage.SaveToFile('C:img.png');
finally
FreeAndNil(LPngImage);
FreeAndNil(LBytesStream);
end;
sockets delphi
asked Nov 23 at 2:58
Pâmella Douglas
676
How i can obtain a screenshot of desktop using a windows service?
i tried the following code who works fine if the application isn't a service, but if are a service return a white picture.
var
LBitmap : TBitmap;
LPngImage : TPngImage;
LDesktopCanvasHandle : HDC;
begin
LBitmap := TBitmap.Create;
LPngImage := TPngImage.Create;
LBytesStream := TBytesStream.Create;
try
LDesktopCanvasHandle := GetWindowDC(GetDesktopWindow);
LBitmap.PixelFormat := pf4bit;
LBitmap.Height := Screen.Height;
LBitmap.Width := Screen.Width;
BitBlt(
LBitmap.Canvas.Handle,
0, 0,
Screen.Width, Screen.Height,
LDesktopCanvasHandle,
0, 0,
SRCCOPY);
LPngImage.Assign(LBitmap);
LPngImage.SaveToFile('C:img.png');
finally
FreeAndNil(LPngImage);
FreeAndNil(LBytesStream);
end;
sockets delphi
sockets delphi
asked Nov 23 at 2:58
Pâmella Douglas
676
asked Nov 23 at 2:58
Pâmella Douglas
676
asked Nov 23 at 2:58
Pâmella Douglas
676
asked Nov 23 at 2:58
Pâmella Douglas
676
asked Nov 23 at 2:58
Pâmella Douglas
676
676
3
Services run in session 0, which does not have access to the desktop of the current user. That means that you can't useGetDesktopWindow, because you don't have access to it, which means thatGetWindowDCdoes not return a valid DC. Therefore, there is no screen to capture, which explains your results. See stackoverflow.com/q/18891819/62576
– Ken White
Nov 23 at 4:30
Solution can be found here (in C#): stackoverflow.com/a/4147868/800214
– whosrdaddy
Nov 23 at 11:12
What happens when there are 5 different people logged into different desktops concurrently on the same machine? Which desktop do you want a screenshot of?
– Jerry Dodge
Nov 25 at 12:40
A random screenshot are fine.
– Pâmella Douglas
Nov 27 at 21:05
add a comment |
3
Services run in session 0, which does not have access to the desktop of the current user. That means that you can't useGetDesktopWindow, because you don't have access to it, which means thatGetWindowDCdoes not return a valid DC. Therefore, there is no screen to capture, which explains your results. See stackoverflow.com/q/18891819/62576
– Ken White
Nov 23 at 4:30
Solution can be found here (in C#): stackoverflow.com/a/4147868/800214
– whosrdaddy
Nov 23 at 11:12
What happens when there are 5 different people logged into different desktops concurrently on the same machine? Which desktop do you want a screenshot of?
– Jerry Dodge
Nov 25 at 12:40
A random screenshot are fine.
– Pâmella Douglas
Nov 27 at 21:05
3
3
Services run in session 0, which does not have access to the desktop of the current user. That means that you can't use
GetDesktopWindow, because you don't have access to it, which means that GetWindowDC does not return a valid DC. Therefore, there is no screen to capture, which explains your results. See stackoverflow.com/q/18891819/62576– Ken White
Nov 23 at 4:30
Services run in session 0, which does not have access to the desktop of the current user. That means that you can't use
GetDesktopWindow, because you don't have access to it, which means that GetWindowDC does not return a valid DC. Therefore, there is no screen to capture, which explains your results. See stackoverflow.com/q/18891819/62576– Ken White
Nov 23 at 4:30
Solution can be found here (in C#): stackoverflow.com/a/4147868/800214
– whosrdaddy
Nov 23 at 11:12
Solution can be found here (in C#): stackoverflow.com/a/4147868/800214
– whosrdaddy
Nov 23 at 11:12
What happens when there are 5 different people logged into different desktops concurrently on the same machine? Which desktop do you want a screenshot of?
– Jerry Dodge
Nov 25 at 12:40
What happens when there are 5 different people logged into different desktops concurrently on the same machine? Which desktop do you want a screenshot of?
– Jerry Dodge
Nov 25 at 12:40
A random screenshot are fine.
– Pâmella Douglas
Nov 27 at 21:05
A random screenshot are fine.
– Pâmella Douglas
Nov 27 at 21:05
add a comment |
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3
Services run in session 0, which does not have access to the desktop of the current user. That means that you can't use
GetDesktopWindow, because you don't have access to it, which means thatGetWindowDCdoes not return a valid DC. Therefore, there is no screen to capture, which explains your results. See stackoverflow.com/q/18891819/62576– Ken White
Nov 23 at 4:30
Solution can be found here (in C#): stackoverflow.com/a/4147868/800214
– whosrdaddy
Nov 23 at 11:12
What happens when there are 5 different people logged into different desktops concurrently on the same machine? Which desktop do you want a screenshot of?
– Jerry Dodge
Nov 25 at 12:40
A random screenshot are fine.
– Pâmella Douglas
Nov 27 at 21:05