Tirar ScreenShot

[Dracom]

Gente... preciso saber como tirar uma ScreenShot no Delhpi e salva-la em uma pasta.

Agradeço por qualquer material (link ou explicação); qualquer coisa que possa me ajudar.

[Jhonas]

como tirar uma ScreenShot no Delhpi e salva-la em uma pasta.

Veja este codigo:

procedure TForm1.Button1Click(Sender: TObject);
var DCDesk: HDC; // hDC of Desktop
  bmp: TBitmap;
begin
  bmp := TBitmap.Create;
   
  bmp.Height := Screen.Height;
  bmp.Width := Screen.Width;

  DCDesk := GetWindowDC(GetDesktopWindow);
  
  BitBlt(bmp.Canvas.Handle, 0, 0, Screen.Width, Screen.Height,
         DCDesk, 0, 0, SRCCOPY);

  bmp.SaveToFile('c:\ScreenShot.bmp');

  ReleaseDC(GetDesktopWindow, DCDesk);

  bmp.Free;
end;

abraço

[Dracom]

Hum... Valeu

Mas eu fiquei curioso em relação a uma parte do codigo:

BitBlt(bmp.Canvas.Handle, 0, 0, Screen.Width, Screen.Height,
         DCDesk, 0, 0, SRCCOPY);

O que eu poderia obter mudando aqueles zeros do codigo acima? Outra duvida:

DCDesk := GetWindowDC(GetDesktopWindow);

Sobre o GetDesktopWindow...

Se não me engano, ele vai tirar a Screen do Desktop, né?

Queria saber pelo que eu poderia substituir nessa linha para obter Screen de locais diferentes (janela ativa etc..)

Muito obrigado pela atenção!

[Jhonas]

Mas eu fiquei curioso em relação a uma parte do codigo:

BitBlt(bmp.Canvas.Handle, 0, 0, Screen.Width, Screen.Height,
         DCDesk, 0, 0, SRCCOPY);

O que eu poderia obter mudando aqueles zeros do codigo acima?

veja o help do delphi

The BitBlt function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.

BOOL BitBlt(

HDC hdcDest, // handle to destination device context

int nXDest, // x-coordinate of destination rectangle's upper-left corner

int nYDest, // y-coordinate of destination rectangle's upper-left corner

int nWidth, // width of destination rectangle

int nHeight, // height of destination rectangle

HDC hdcSrc, // handle to source device context

int nXSrc, // x-coordinate of source rectangle's upper-left corner

int nYSrc, // y-coordinate of source rectangle's upper-left corner

DWORD dwRop // raster operation code

);

Parameters

hdcDest

Identifies the destination device context.

nXDest

Specifies the logical x-coordinate of the upper-left corner of the destination rectangle.

nYDest

Specifies the logical y-coordinate of the upper-left corner of the destination rectangle.

nWidth

Specifies the logical width of the source and destination rectangles.

nHeight

Specifies the logical height of the source and the destination rectangles.

hdcSrc

Identifies the source device context.

nXSrc

Specifies the logical x-coordinate of the upper-left corner of the source rectangle.

nYSrc

Specifies the logical y-coordinate of the upper-left corner of the source rectangle.

dwRop

Specifies a raster-operation code. These codes define how the color data for the source rectangle is to be combined with the color data for the destination rectangle to achieve the final color.

The following list shows some common raster operation codes:

Value Description

BLACKNESS Fills the destination rectangle using the color associated with index 0 in the physical palette. (This color is black for the default physical palette.)

DSTINVERT Inverts the destination rectangle.

MERGECOPY Merges the colors of the source rectangle with the specified pattern by using the Boolean AND operator.

MERGEPAINT Merges the colors of the inverted source rectangle with the colors of the destination rectangle by using the Boolean OR operator.

NOTSRCCOPY Copies the inverted source rectangle to the destination.

NOTSRCERASE Combines the colors of the source and destination rectangles by using the Boolean OR operator and then inverts the resultant color.

PATCOPY Copies the specified pattern into the destination bitmap.

PATINVERT Combines the colors of the specified pattern with the colors of the destination rectangle by using the Boolean XOR operator.

PATPAINT Combines the colors of the pattern with the colors of the inverted source rectangle by using the Boolean OR operator. The result of this operation is combined with the colors of the destination rectangle by using the Boolean OR operator.

SRCAND Combines the colors of the source and destination rectangles by using the Boolean AND operator.

SRCCOPY Copies the source rectangle directly to the destination rectangle.

SRCERASE Combines the inverted colors of the destination rectangle with the colors of the source rectangle by using the Boolean AND operator.

SRCINVERT Combines the colors of the source and destination rectangles by using the Boolean XOR operator.

SRCPAINT Combines the colors of the source and destination rectangles by using the Boolean OR operator.

WHITENESS Fills the destination rectangle using the color associated with index 1 in the physical palette. (This color is white for the default physical palette.)

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

If a rotation or shear transformation is in effect in the source device context, BitBlt returns an error. If other transformations exist in the source device context (and a matching transformation is not in effect in the destination device context), the rectangle in the destination device context is stretched, compressed, or rotated as necessary.

If the color formats of the source and destination device contexts do not match, the BitBlt function converts the source color format to match the destination format.

When an enhanced metafile is being recorded, an error occurs if the source device context identifies an enhanced-metafile device context.

Not all devices support the BitBlt function. For more information, see the RC_BITBLT raster capability entry in GetDeviceCaps.

BitBlt returns an error if the source and destination device contexts represent different devices.

Sobre o GetDesktopWindow...

Se não me engano, ele vai tirar a Screen do Desktop, né?

Queria saber pelo que eu poderia substituir nessa linha para obter Screen de locais diferentes (janela ativa etc..)

De acordo com o help do delphi

The GetDesktopWindow function returns the handle of the Windows desktop window. The desktop window covers the entire screen. The desktop window is the area on top of which all icons and other windows are painted.

HWND GetDesktopWindow(VOID)

Parameters

This function has no parameters.

Return Values

The return value is the handle of the desktop window.

OBS: Se voce se esforçar um pouco, descobrirá que pode fazer aquilo que está querendo.

abraço