Screenshot: BitBlt and TCanvas.CopyRect. There are others WinApi equivalent to these two functions?

Exists others functions of Windows api equivalent to BitBlt and TCanvas.CopyRect and that can be used in a screen capture procedure?

Here are two codes that are able to produce screenshot using BitBl and TCanvas.CopyRect respectively:

procedure GetScreenToBmp(StreamName: TMemoryStream);

var

  Rect: Windows.TRect;

  DC, bitmapDC, windowDC: HDC;

  W, H: Integer;

  BI: BITMAPINFO;

  bitmap: HBITMAP;

  bmi: Windows.bitmap;

  ColorDepth: Integer;

  bitmapData: Pointer;

  BMP: TBitmap;

Begin

  GetWindowRect(GetDesktopWindow, Rect);



  DC := GetDC(GetDesktopWindow);

  Try

    ColorDepth := GetDeviceCaps(DC, BitsPixel);

  Finally

    ReleaseDC(GetDesktopWindow, DC);

  End;



  W := Rect.Right - Rect.Left;

  H := Rect.Bottom - Rect.Top;



  bitmapDC := CreateCompatibleDC(0);

  Try



    BI.bmiHeader.biSize := SizeOf(BITMAPINFOHEADER);

    BI.bmiHeader.biWidth := W;

    BI.bmiHeader.biHeight := H;

    BI.bmiHeader.biPlanes := 1;

    BI.bmiHeader.biBitCount := ColorDepth;

    BI.bmiHeader.biCompression := BI_RGB;

    BI.bmiHeader.biSizeImage := W * H * ColorDepth Div 8;

    BI.bmiHeader.biXPelsPerMeter := 100;

    BI.bmiHeader.biYPelsPerMeter := 100;

    BI.bmiHeader.biClrUsed := 0;

    BI.bmiHeader.biClrImportant := 0;



    bitmap := CreateDIBSection(bitmapDC, BI, DIB_RGB_COLORS, bitmapData, 0, 0);

    If bitmap = 0 Then

      Exit;



    GetObject(bitmap, SizeOf(bmi), @bmi);



  Finally

    DeleteDC(bitmapDC);

  End;



  bitmapDC := CreateCompatibleDC(0);

  Try

    SelectObject(bitmapDC, bitmap);

    windowDC := GetWindowDC(GetDesktopWindow);

    Try

      BitBlt(bitmapDC, 0, 0, W, H, windowDC, 0, 0, SRCCOPY);

    Finally

      ReleaseDC(GetDesktopWindow, windowDC);

    End;



  Finally

    DeleteDC(bitmapDC);

  End;



  BMP := TBitmap.Create;

  Try

    BMP.ReleaseHandle;

    BMP.ReleaseMaskHandle;

    BMP.ReleasePalette;

    BMP.PixelFormat := pf24bit;

    BMP.Handle := bitmap;

    BMP.SaveToFile('test.bmp');

    //BMP.SaveToStream(StreamName);

  Finally

    BMP.Free;

  End;

End;



procedure GetScreenToBmp2(StreamName: TMemoryStream);

var

  Mybmp: TBitmap;

  DC: HDC;

  Mycan: Tcanvas;

  R: TRect;

begin

  Mybmp := TBitmap.Create;

  Mycan := Tcanvas.Create;

  DC := GetWindowDC(0);

  try

    Mycan.Handle := DC;

    R := Rect(0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));

    Mybmp.Width := R.Right;

    Mybmp.Height := R.Bottom;

    Mybmp.Canvas.CopyRect(R, Mycan, R);

  finally

    ReleaseDC(0, DC);

  end;

  Mycan.Handle := 0;

  Mycan.Free;



  Mybmp.PixelFormat := pf24bit;

  Mybmp.SaveToFile('test.bmp');

  //Mybmp.SaveToStream(StreamName);

  Mybmp.Free;

end;

asked Nov 25 '18 at 19:39

Davison

1158

1

Just for fun or you need the alternative to be better in some aspect?

– Sertac Akyuz
Nov 25 '18 at 19:46

To bypass api hook in BitBlt, StretchBlt for example.

– Davison
Nov 25 '18 at 19:48

3

There are other ways to capture, not necessarily through one api function though. Some.

– Sertac Akyuz
Nov 25 '18 at 19:51

Yes, i also already saw this link, but all suggestions are covered by api hook in BitBlt, StretchBlt. I already tested all these suggestions.

– Davison
Nov 25 '18 at 19:59

3

TCanvas.CopyRect() is just a thin wrapper for StretchBlt(). BitBlt() and StretchBlt() are Win32 API functions, not a VCL functions. If someone decides to hook the Win32 API directly, there is really not much you can do about it, short of manually removing the hooks, or writing a custom display driver. Why do you need to avoid the hooks? Is someone altering the screenshots you are trying to take?

– Remy Lebeau
Nov 25 '18 at 21:05

|
show 2 more comments

Exists others functions of Windows api equivalent to BitBlt and TCanvas.CopyRect and that can be used in a screen capture procedure?

Here are two codes that are able to produce screenshot using BitBl and TCanvas.CopyRect respectively:

procedure GetScreenToBmp(StreamName: TMemoryStream);

var

  Rect: Windows.TRect;

  DC, bitmapDC, windowDC: HDC;

  W, H: Integer;

  BI: BITMAPINFO;

  bitmap: HBITMAP;

  bmi: Windows.bitmap;

  ColorDepth: Integer;

  bitmapData: Pointer;

  BMP: TBitmap;

Begin

  GetWindowRect(GetDesktopWindow, Rect);



  DC := GetDC(GetDesktopWindow);

  Try

    ColorDepth := GetDeviceCaps(DC, BitsPixel);

  Finally

    ReleaseDC(GetDesktopWindow, DC);

  End;



  W := Rect.Right - Rect.Left;

  H := Rect.Bottom - Rect.Top;



  bitmapDC := CreateCompatibleDC(0);

  Try



    BI.bmiHeader.biSize := SizeOf(BITMAPINFOHEADER);

    BI.bmiHeader.biWidth := W;

    BI.bmiHeader.biHeight := H;

    BI.bmiHeader.biPlanes := 1;

    BI.bmiHeader.biBitCount := ColorDepth;

    BI.bmiHeader.biCompression := BI_RGB;

    BI.bmiHeader.biSizeImage := W * H * ColorDepth Div 8;

    BI.bmiHeader.biXPelsPerMeter := 100;

    BI.bmiHeader.biYPelsPerMeter := 100;

    BI.bmiHeader.biClrUsed := 0;

    BI.bmiHeader.biClrImportant := 0;



    bitmap := CreateDIBSection(bitmapDC, BI, DIB_RGB_COLORS, bitmapData, 0, 0);

    If bitmap = 0 Then

      Exit;



    GetObject(bitmap, SizeOf(bmi), @bmi);



  Finally

    DeleteDC(bitmapDC);

  End;



  bitmapDC := CreateCompatibleDC(0);

  Try

    SelectObject(bitmapDC, bitmap);

    windowDC := GetWindowDC(GetDesktopWindow);

    Try

      BitBlt(bitmapDC, 0, 0, W, H, windowDC, 0, 0, SRCCOPY);

    Finally

      ReleaseDC(GetDesktopWindow, windowDC);

    End;



  Finally

    DeleteDC(bitmapDC);

  End;



  BMP := TBitmap.Create;

  Try

    BMP.ReleaseHandle;

    BMP.ReleaseMaskHandle;

    BMP.ReleasePalette;

    BMP.PixelFormat := pf24bit;

    BMP.Handle := bitmap;

    BMP.SaveToFile('test.bmp');

    //BMP.SaveToStream(StreamName);

  Finally

    BMP.Free;

  End;

End;



procedure GetScreenToBmp2(StreamName: TMemoryStream);

var

  Mybmp: TBitmap;

  DC: HDC;

  Mycan: Tcanvas;

  R: TRect;

begin

  Mybmp := TBitmap.Create;

  Mycan := Tcanvas.Create;

  DC := GetWindowDC(0);

  try

    Mycan.Handle := DC;

    R := Rect(0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));

    Mybmp.Width := R.Right;

    Mybmp.Height := R.Bottom;

    Mybmp.Canvas.CopyRect(R, Mycan, R);

  finally

    ReleaseDC(0, DC);

  end;

  Mycan.Handle := 0;

  Mycan.Free;



  Mybmp.PixelFormat := pf24bit;

  Mybmp.SaveToFile('test.bmp');

  //Mybmp.SaveToStream(StreamName);

  Mybmp.Free;

end;

asked Nov 25 '18 at 19:39

Davison

1158

1

Just for fun or you need the alternative to be better in some aspect?

– Sertac Akyuz
Nov 25 '18 at 19:46

To bypass api hook in BitBlt, StretchBlt for example.

– Davison
Nov 25 '18 at 19:48

3

There are other ways to capture, not necessarily through one api function though. Some.

– Sertac Akyuz
Nov 25 '18 at 19:51

Yes, i also already saw this link, but all suggestions are covered by api hook in BitBlt, StretchBlt. I already tested all these suggestions.

– Davison
Nov 25 '18 at 19:59

3

TCanvas.CopyRect() is just a thin wrapper for StretchBlt(). BitBlt() and StretchBlt() are Win32 API functions, not a VCL functions. If someone decides to hook the Win32 API directly, there is really not much you can do about it, short of manually removing the hooks, or writing a custom display driver. Why do you need to avoid the hooks? Is someone altering the screenshots you are trying to take?

– Remy Lebeau
Nov 25 '18 at 21:05

|
show 2 more comments

Exists others functions of Windows api equivalent to BitBlt and TCanvas.CopyRect and that can be used in a screen capture procedure?

Here are two codes that are able to produce screenshot using BitBl and TCanvas.CopyRect respectively:

procedure GetScreenToBmp(StreamName: TMemoryStream);

var

  Rect: Windows.TRect;

  DC, bitmapDC, windowDC: HDC;

  W, H: Integer;

  BI: BITMAPINFO;

  bitmap: HBITMAP;

  bmi: Windows.bitmap;

  ColorDepth: Integer;

  bitmapData: Pointer;

  BMP: TBitmap;

Begin

  GetWindowRect(GetDesktopWindow, Rect);



  DC := GetDC(GetDesktopWindow);

  Try

    ColorDepth := GetDeviceCaps(DC, BitsPixel);

  Finally

    ReleaseDC(GetDesktopWindow, DC);

  End;



  W := Rect.Right - Rect.Left;

  H := Rect.Bottom - Rect.Top;



  bitmapDC := CreateCompatibleDC(0);

  Try



    BI.bmiHeader.biSize := SizeOf(BITMAPINFOHEADER);

    BI.bmiHeader.biWidth := W;

    BI.bmiHeader.biHeight := H;

    BI.bmiHeader.biPlanes := 1;

    BI.bmiHeader.biBitCount := ColorDepth;

    BI.bmiHeader.biCompression := BI_RGB;

    BI.bmiHeader.biSizeImage := W * H * ColorDepth Div 8;

    BI.bmiHeader.biXPelsPerMeter := 100;

    BI.bmiHeader.biYPelsPerMeter := 100;

    BI.bmiHeader.biClrUsed := 0;

    BI.bmiHeader.biClrImportant := 0;



    bitmap := CreateDIBSection(bitmapDC, BI, DIB_RGB_COLORS, bitmapData, 0, 0);

    If bitmap = 0 Then

      Exit;



    GetObject(bitmap, SizeOf(bmi), @bmi);



  Finally

    DeleteDC(bitmapDC);

  End;



  bitmapDC := CreateCompatibleDC(0);

  Try

    SelectObject(bitmapDC, bitmap);

    windowDC := GetWindowDC(GetDesktopWindow);

    Try

      BitBlt(bitmapDC, 0, 0, W, H, windowDC, 0, 0, SRCCOPY);

    Finally

      ReleaseDC(GetDesktopWindow, windowDC);

    End;



  Finally

    DeleteDC(bitmapDC);

  End;



  BMP := TBitmap.Create;

  Try

    BMP.ReleaseHandle;

    BMP.ReleaseMaskHandle;

    BMP.ReleasePalette;

    BMP.PixelFormat := pf24bit;

    BMP.Handle := bitmap;

    BMP.SaveToFile('test.bmp');

    //BMP.SaveToStream(StreamName);

  Finally

    BMP.Free;

  End;

End;



procedure GetScreenToBmp2(StreamName: TMemoryStream);

var

  Mybmp: TBitmap;

  DC: HDC;

  Mycan: Tcanvas;

  R: TRect;

begin

  Mybmp := TBitmap.Create;

  Mycan := Tcanvas.Create;

  DC := GetWindowDC(0);

  try

    Mycan.Handle := DC;

    R := Rect(0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));

    Mybmp.Width := R.Right;

    Mybmp.Height := R.Bottom;

    Mybmp.Canvas.CopyRect(R, Mycan, R);

  finally

    ReleaseDC(0, DC);

  end;

  Mycan.Handle := 0;

  Mycan.Free;



  Mybmp.PixelFormat := pf24bit;

  Mybmp.SaveToFile('test.bmp');

  //Mybmp.SaveToStream(StreamName);

  Mybmp.Free;

end;

asked Nov 25 '18 at 19:39

Davison

1158

Exists others functions of Windows api equivalent to BitBlt and TCanvas.CopyRect and that can be used in a screen capture procedure?

Here are two codes that are able to produce screenshot using BitBl and TCanvas.CopyRect respectively:

procedure GetScreenToBmp(StreamName: TMemoryStream);

var

  Rect: Windows.TRect;

  DC, bitmapDC, windowDC: HDC;

  W, H: Integer;

  BI: BITMAPINFO;

  bitmap: HBITMAP;

  bmi: Windows.bitmap;

  ColorDepth: Integer;

  bitmapData: Pointer;

  BMP: TBitmap;

Begin

  GetWindowRect(GetDesktopWindow, Rect);



  DC := GetDC(GetDesktopWindow);

  Try

    ColorDepth := GetDeviceCaps(DC, BitsPixel);

  Finally

    ReleaseDC(GetDesktopWindow, DC);

  End;



  W := Rect.Right - Rect.Left;

  H := Rect.Bottom - Rect.Top;



  bitmapDC := CreateCompatibleDC(0);

  Try



    BI.bmiHeader.biSize := SizeOf(BITMAPINFOHEADER);

    BI.bmiHeader.biWidth := W;

    BI.bmiHeader.biHeight := H;

    BI.bmiHeader.biPlanes := 1;

    BI.bmiHeader.biBitCount := ColorDepth;

    BI.bmiHeader.biCompression := BI_RGB;

    BI.bmiHeader.biSizeImage := W * H * ColorDepth Div 8;

    BI.bmiHeader.biXPelsPerMeter := 100;

    BI.bmiHeader.biYPelsPerMeter := 100;

    BI.bmiHeader.biClrUsed := 0;

    BI.bmiHeader.biClrImportant := 0;



    bitmap := CreateDIBSection(bitmapDC, BI, DIB_RGB_COLORS, bitmapData, 0, 0);

    If bitmap = 0 Then

      Exit;



    GetObject(bitmap, SizeOf(bmi), @bmi);



  Finally

    DeleteDC(bitmapDC);

  End;



  bitmapDC := CreateCompatibleDC(0);

  Try

    SelectObject(bitmapDC, bitmap);

    windowDC := GetWindowDC(GetDesktopWindow);

    Try

      BitBlt(bitmapDC, 0, 0, W, H, windowDC, 0, 0, SRCCOPY);

    Finally

      ReleaseDC(GetDesktopWindow, windowDC);

    End;



  Finally

    DeleteDC(bitmapDC);

  End;



  BMP := TBitmap.Create;

  Try

    BMP.ReleaseHandle;

    BMP.ReleaseMaskHandle;

    BMP.ReleasePalette;

    BMP.PixelFormat := pf24bit;

    BMP.Handle := bitmap;

    BMP.SaveToFile('test.bmp');

    //BMP.SaveToStream(StreamName);

  Finally

    BMP.Free;

  End;

End;



procedure GetScreenToBmp2(StreamName: TMemoryStream);

var

  Mybmp: TBitmap;

  DC: HDC;

  Mycan: Tcanvas;

  R: TRect;

begin

  Mybmp := TBitmap.Create;

  Mycan := Tcanvas.Create;

  DC := GetWindowDC(0);

  try

    Mycan.Handle := DC;

    R := Rect(0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));

    Mybmp.Width := R.Right;

    Mybmp.Height := R.Bottom;

    Mybmp.Canvas.CopyRect(R, Mycan, R);

  finally

    ReleaseDC(0, DC);

  end;

  Mycan.Handle := 0;

  Mycan.Free;



  Mybmp.PixelFormat := pf24bit;

  Mybmp.SaveToFile('test.bmp');

  //Mybmp.SaveToStream(StreamName);

  Mybmp.Free;

end;

windows delphi winapi screenshot delphi-xe7

asked Nov 25 '18 at 19:39

Davison

1158

asked Nov 25 '18 at 19:39

Davison

1158

asked Nov 25 '18 at 19:39

Davison

1158

asked Nov 25 '18 at 19:39

Davison

1158

asked Nov 25 '18 at 19:39

Davison

1158

1

Just for fun or you need the alternative to be better in some aspect?

– Sertac Akyuz
Nov 25 '18 at 19:46

To bypass api hook in BitBlt, StretchBlt for example.

– Davison
Nov 25 '18 at 19:48

3

There are other ways to capture, not necessarily through one api function though. Some.

– Sertac Akyuz
Nov 25 '18 at 19:51

Yes, i also already saw this link, but all suggestions are covered by api hook in BitBlt, StretchBlt. I already tested all these suggestions.

– Davison
Nov 25 '18 at 19:59

3

TCanvas.CopyRect() is just a thin wrapper for StretchBlt(). BitBlt() and StretchBlt() are Win32 API functions, not a VCL functions. If someone decides to hook the Win32 API directly, there is really not much you can do about it, short of manually removing the hooks, or writing a custom display driver. Why do you need to avoid the hooks? Is someone altering the screenshots you are trying to take?

– Remy Lebeau
Nov 25 '18 at 21:05

|
show 2 more comments

1

Just for fun or you need the alternative to be better in some aspect?

– Sertac Akyuz
Nov 25 '18 at 19:46

To bypass api hook in BitBlt, StretchBlt for example.

– Davison
Nov 25 '18 at 19:48

3

There are other ways to capture, not necessarily through one api function though. Some.

– Sertac Akyuz
Nov 25 '18 at 19:51

Yes, i also already saw this link, but all suggestions are covered by api hook in BitBlt, StretchBlt. I already tested all these suggestions.

– Davison
Nov 25 '18 at 19:59

3

TCanvas.CopyRect() is just a thin wrapper for StretchBlt(). BitBlt() and StretchBlt() are Win32 API functions, not a VCL functions. If someone decides to hook the Win32 API directly, there is really not much you can do about it, short of manually removing the hooks, or writing a custom display driver. Why do you need to avoid the hooks? Is someone altering the screenshots you are trying to take?

– Remy Lebeau
Nov 25 '18 at 21:05

Just for fun or you need the alternative to be better in some aspect?

– Sertac Akyuz
Nov 25 '18 at 19:46

To bypass api hook in BitBlt, StretchBlt for example.

– Davison
Nov 25 '18 at 19:48

There are other ways to capture, not necessarily through one api function though. Some.

– Sertac Akyuz
Nov 25 '18 at 19:51

Yes, i also already saw this link, but all suggestions are covered by api hook in BitBlt, StretchBlt. I already tested all these suggestions.

– Davison
Nov 25 '18 at 19:59

TCanvas.CopyRect() is just a thin wrapper for StretchBlt(). BitBlt() and StretchBlt() are Win32 API functions, not a VCL functions. If someone decides to hook the Win32 API directly, there is really not much you can do about it, short of manually removing the hooks, or writing a custom display driver. Why do you need to avoid the hooks? Is someone altering the screenshots you are trying to take?

– Remy Lebeau
Nov 25 '18 at 21:05

|
show 2 more comments

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