how to retrieve exact text width for RenderText in Graphics32

how to retrieve exact text width for RenderText in Graphics32 - delphi

I think my question is clear enough, but I explain more. Simply, when we are using AntiAlias on RenderText procedure, the value gotten within TextWidth function is not correct. What can I do to get the right text width?

You can look for the algorithm in their own code. They must also calculate it. Anyway this is how I do it.
function TGR32Canvas.TextWidth(const Text: string): Integer;
var
TempFont: TFont;
TempWidth: Integer;
begin
if Text <> '' then
begin
TempFont := TFont.Create;
try
TempFont.Assign(Font);
TempFont.Size := Font.Size shl AA_MODE;
TempWidth := GetTextWidth(Text, TempFont);
finally
TempFont.Free;
end;
end
else
TempWidth := 0;
TempWidth := (TempWidth shr AA_MODE + 1) shl AA_MODE;
Result := TempWidth shr AA_MODE;
end;
The GetTextWidth function is simple. You can do it differently.
function GetTextWidth(const Text: string; const Font: TFont): Integer;
var
Canvas: TCanvas;
begin
Canvas := TCanvas.Create;
try
Canvas.Handle := GetDC(0);
try
Canvas.Font.Assign(Font);
Result := Canvas.TextWidth(Text);
finally
ReleaseDC(0, Canvas.Handle);
end;
finally
Canvas.Free;
end;
end;

You can also use the Windows API function GetTextExtentPoint32
Do some google to find example on Delphi

Related

How to take a screenshot of the Active Window in Delphi 10? [duplicate]

For full screenshots, I use this code:
form1.Hide;
sleep(500);
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);
form1.Show ;
FileName := 'Screenshot_'+FormatDateTime('mm-dd-yyyy-hhnnss',now());
bmp.SaveToFile(Format('C:\Screenshots\%s.bmp', [FileName]));
ReleaseDC(GetDesktopWindow, DCDesk);
bmp.Free;
How can I convert that to take a screenshot of only the active window.

First of all you have to get the right window. As sharptooth already noted you should use GetForegroundWindow instead of GetDesktopWindow. You have done it right in your improved version.
But then you have to resize your bitmap to the actual size of the DC/Window. You haven't done this yet.
And then make sure you don't capture some fullscreen window!
When I executed your code, my Delphi IDE was captured and as it is on fullscreen by default, it created the illusion of a fullscreen screenshot. (Even though your code is mostly correct)
Considering the above steps, I was successfully able to create a single-window screenshot with your code.
Just a hint: You can GetDC instead of GetWindowDC if you are only interested in the client area. (No window borders)
EDIT: Here's what I made with your code:
You should not use this code! Look at the improved version below.
procedure TForm1.Button1Click(Sender: TObject);
const
FullWindow = True; // Set to false if you only want the client area.
var
hWin: HWND;
dc: HDC;
bmp: TBitmap;
FileName: string;
r: TRect;
w: Integer;
h: Integer;
begin
form1.Hide;
sleep(500);
hWin := GetForegroundWindow;
if FullWindow then
begin
GetWindowRect(hWin,r);
dc := GetWindowDC(hWin) ;
end else
begin
Windows.GetClientRect(hWin, r);
dc := GetDC(hWin) ;
end;
w := r.Right - r.Left;
h := r.Bottom - r.Top;
bmp := TBitmap.Create;
bmp.Height := h;
bmp.Width := w;
BitBlt(bmp.Canvas.Handle, 0, 0, w, h, DC, 0, 0, SRCCOPY);
form1.Show ;
FileName := 'Screenshot_'+FormatDateTime('mm-dd-yyyy-hhnnss',now());
bmp.SaveToFile(Format('C:\Screenshots\%s.bmp', [FileName]));
ReleaseDC(hwin, DC);
bmp.Free;
end;
EDIT 2: As requested I'm adding a better version of the code, but I'm keeping the old one as a reference. You should seriously consider using this instead of your original code. It'll behave much nicer in case of errors. (Resources are cleaned up, your form will be visible again, ...)
procedure TForm1.Button1Click(Sender: TObject);
const
FullWindow = True; // Set to false if you only want the client area.
var
Win: HWND;
DC: HDC;
Bmp: TBitmap;
FileName: string;
WinRect: TRect;
Width: Integer;
Height: Integer;
begin
Form1.Hide;
try
Application.ProcessMessages; // Was Sleep(500);
Win := GetForegroundWindow;
if FullWindow then
begin
GetWindowRect(Win, WinRect);
DC := GetWindowDC(Win);
end else
begin
Windows.GetClientRect(Win, WinRect);
DC := GetDC(Win);
end;
try
Width := WinRect.Right - WinRect.Left;
Height := WinRect.Bottom - WinRect.Top;
Bmp := TBitmap.Create;
try
Bmp.Height := Height;
Bmp.Width := Width;
BitBlt(Bmp.Canvas.Handle, 0, 0, Width, Height, DC, 0, 0, SRCCOPY);
FileName := 'Screenshot_' +
FormatDateTime('mm-dd-yyyy-hhnnss', Now());
Bmp.SaveToFile(Format('C:\Screenshots\%s.bmp', [FileName]));
finally
Bmp.Free;
end;
finally
ReleaseDC(Win, DC);
end;
finally
Form1.Show;
end;
end;

Your code could be a lot simpler. When you have decided on which form you want to save, try the code I use:
procedure SaveFormBitmapToBMPFile( AForm : TCustomForm; AFileName : string = '' );
// Copies this form's bitmap to the specified file
var
Bitmap: TBitMap;
begin
Bitmap := AForm.GetFormImage;
try
Bitmap.SaveToFile( AFileName );
finally
Bitmap.Free;
end;
end;

This combines all the approaches described so far. It also handles multiple-monitor scenarios.
Pass in the kind of screenshot you want, and a TJpegImage, and it will assign your requested screenshot to that image.
///////////
uses
Jpeg;
type //define an ENUM to describe the possible screenshot types.
TScreenShotType = (sstActiveWindow, sstActiveClientArea,
sstPrimaryMonitor, sstDesktop);
///////////
procedure TfrmMain.GetScreenShot(shotType: TScreenShotType;
var img: TJpegImage);
var
w,h: integer;
DC: HDC;
hWin: Cardinal;
r: TRect;
tmpBmp: TBitmap;
begin
hWin := 0;
case shotType of
sstActiveWindow:
begin
//only the active window
hWin := GetForegroundWindow;
dc := GetWindowDC(hWin);
GetWindowRect(hWin,r);
w := r.Right - r.Left;
h := r.Bottom - r.Top;
end; //sstActiveWindow
sstActiveClientArea:
begin
//only the active client area (active window minus title bars)
hWin := GetForegroundWindow;
dc := GetDC(hWin);
GetWindowRect(hWin,r);
w := r.Right - r.Left;
h := r.Bottom - r.Top;
end; //sstActiveClientArea
sstPrimaryMonitor:
begin
//only the primary monitor. If 1 monitor, same as sstDesktop.
hWin := GetDesktopWindow;
dc := GetDC(hWin);
w := GetDeviceCaps(DC,HORZRES);
h := GetDeviceCaps(DC,VERTRES);
end; //sstPrimaryMonitor
sstDesktop:
begin
//ENTIRE desktop (all monitors)
dc := GetDC(GetDesktopWindow);
w := Screen.DesktopWidth;
h := Screen.DesktopHeight;
end; //sstDesktop
else begin
Exit;
end; //case else
end; //case
//convert to jpg
tmpBmp := TBitmap.Create;
try
tmpBmp.Width := w;
tmpBmp.Height := h;
BitBlt(tmpBmp.Canvas.Handle,0,0,tmpBmp.Width,
tmpBmp.Height,DC,0,0,SRCCOPY);
img.Assign(tmpBmp);
finally
ReleaseDC(hWin,DC);
FreeAndNil(tmpBmp);
end; //try-finally
end;

JCL comes to the rescue once again..
hwnd := GetForegroundWindow;
Windows.GetClientRect(hwnd, r);
JclGraphics.ScreenShot(theBitmap, 0, 0, r.Right - r.Left, r.Bottom - r.Top, hwnd);
// use theBitmap...

Thank you for this useful submission I thought I might make the code offered into a unit to use all over my application, here is the code I have running on DX10.2 Tokyo. Please note the example, watch out for memory leaks.
unit ScreenCapture;
interface
uses Windows, Vcl.Controls, Vcl.StdCtrls, VCL.Graphics,VCL.Imaging.JPEG, VCL.Forms;
function getScreenCapture( FullWindow: Boolean = True ) : TBitmap;
implementation
function getScreenCapture( FullWindow: Boolean ) : TBitmap;
var
Win: HWND;
DC: HDC;
WinRect: TRect;
Width: Integer;
Height: Integer;
begin
Result := TBitmap.Create;
//Application.ProcessMessages; // Was Sleep(500);
Win := GetForegroundWindow;
if FullWindow then
begin
GetWindowRect(Win, WinRect);
DC := GetWindowDC(Win);
end
else
begin
Windows.GetClientRect(Win, WinRect);
DC := GetDC(Win);
end;
try
Width := WinRect.Right - WinRect.Left;
Height := WinRect.Bottom - WinRect.Top;
Result.Height := Height;
Result.Width := Width;
BitBlt(Result.Canvas.Handle, 0, 0, Width, Height, DC, 0, 0, SRCCOPY);
finally
ReleaseDC(Win, DC);
end;
end;
end.
Example :
//Any event or button click, screenCapture is a TBitmap
screenCapture := getScreenCapture();
try
//Do some things with screen capture
Image1.Picture.Graphic := screenCapture;
finally
screenCapture.Free;
end;

Use GetForegroundWindow() instead of GetDesktopWindow().
You'll have to save the handle which GetForegroundWindow() return and pass the saved value into ReleaseDC() - to be sure that GetWindowDC() and ReleaseDC() are called exactly for the same window in case the active window changes between calls.

In case anyone is looking for a more cross-platform solution, this one claims Windows and MacOS-X support:
https://github.com/z505/screenshot-delphi

The shortest version of the Brian Frost code:
Screen.ActiveForm.GetFormImage.SaveToFile(Screen.ActiveForm.Caption+'.bmp');
Just one line of the code (Screenshot of the active window in the MDI application).

How to put textout in an area?

Currently using canvas.textout in a TGraphicControl Component, to show some text but i need the text to stay inside an area. Is there any property like word wrap i could use.. or a way to set the textout area? like so
var
r: TRect
s: string
begin
s := 'some long text that takes up about 3-4 lines';
r.Left := 10;
r.Top := 10;
r.Right := 20;
r.bottom := 50;
textout(r,s);
end;

You can use the DrawText function for this:
procedure TForm1.FormPaint(Sender: TObject);
const
S = 'This is some sample text. It is very long. Very long, indeed.' +
'Very, very, long.';
var
R: TRect;
begin
R := Rect(100, 100, 200, 200);
DrawText(Canvas.Handle, S, length(S), R, DT_WORDBREAK);
end;

Delphi image canvas... paint an area (triangle, rectangle, polygons)

I have a variable number of points on a canvas.
Sometime its four other times 3 points, or 6.
Is there a function that can paint the area inside?
Thank you for your help.

Use the TCanvas.Polygon function. Declare an array of TPoint, set its length to the count of your points, specify each point's coordinates (optionally modify canvas pen and/or brush) and pass this array to the TCanvas.Polygon function. Like in this boring example:
procedure TForm1.Button1Click(Sender: TObject);
var
Points: array of TPoint;
begin
SetLength(Points, 3);
Points[0] := Point(5, 5);
Points[1] := Point(55, 5);
Points[2] := Point(30, 30);
Canvas.Pen.Width := 2;
Canvas.Pen.Color := clRed;
Canvas.Brush.Color := clYellow;
Canvas.Polygon(Points);
end;
Here's how it looks like:

As a complement to TLama's excellent answer, this is a case where you can obtain pretty convenient syntax using the open array construct. Consider the helper function
procedure DrawPolygon(Canvas: TCanvas; const Points: array of integer);
var
arr: array of TPoint;
i: Integer;
begin
SetLength(arr, Length(Points) div 2);
for i := 0 to High(arr) do
arr[i] := Point(Points[2*i], Points[2*i+1]);
Canvas.Polygon(arr);
end;
defined and implemented once and for all. Now you can do simply
Canvas.Pen.Width := 2;
Canvas.Pen.Color := clRed;
Canvas.Brush.Color := clYellow;
DrawPolygon(Canvas, [5, 5, 55, 5, 30, 30]);
to draw the same figure as in TLama's example.

As a complement to both TLama's and Andreas answer, here's another alternative :
procedure TForm1.Button1Click(Sender: TObject);
begin
Canvas.Pen.Color := clRed;
Canvas.Brush.Color := clYellow;
Self.Canvas.Polygon( [Point(5,5), Point(55,5), Point(30,30)]);
end;
Utilizing open array construct and Point record.

Is it possible to determine if the text in a dbEdit is longer than what is visible?

On some forms I have dbEdits that sometimes aren't wide enough to show all the text their fields may contain. For them I have the following code:
procedure Tgm12edLots.dbeLotNameMouseEnter(Sender: TObject);
begin
with dbeLotName do begin
ShowHint := True;
Hint := Text;
end;
end;
I'd like to avoid the hint showing if all the text is visible, but I don't how to test for that condition.
Thanks for any tips/suggestions!

Here is a fast version (without a TBitmap overhead) that takes into account the Edit control's Margins (i.e. EM_SETMARGINS).
Use IsEditTextOverflow below to determine if the Text overflows the visible area.
type
TCustomEditAccess = class(TCustomEdit);
function EditTextWidth(Edit: TCustomEdit): Integer;
var
DC: HDC;
Size: TSize;
SaveFont: HFont;
begin
DC := GetDC(0);
SaveFont := SelectObject(DC, TCustomEditAccess(Edit).Font.Handle);
GetTextExtentPoint32(DC, PChar(Edit.Text), Length(Edit.Text), Size);
SelectObject(DC, SaveFont);
ReleaseDC(0, DC);
Result := Size.cx;
end;
function EditVisibleWidth(Edit: TCustomEdit): Integer;
var
R: TRect;
begin
SendMessage(Edit.Handle, EM_GETRECT, 0, LPARAM(#R));
Result := R.Right - R.Left;
end;
function IsEditTextOverflow(Edit: TCustomEdit): Boolean;
begin
Result := EditTextWidth(Edit) > EditVisibleWidth(Edit);
end;

I think this should work...
function CanShowAllText(Edit: TDBEdit):Boolean;
var
TextWidth:Integer;
VisibleWidth: Integer;
Bitmap: TBitmap;
const
//This could be worked out but without delphi I can't remember all that goes into it.
BordersAndMarginsWidthEtc = 4;
begin
Bitmap := TBitmap.Create;
try
Bitmap.Canvas.Font.Assign(Edit.Font);
TextWidth := Bitmap.Canvas.TextWidth(Edit.Text);
VisibleWidth := Edit.Width - BordersAndMarginsWidthEtc;
Result := TextWidth < VisibleWidth;
finally
Bitmap.Free;
end;
end;

How to take a screenshot of the Active Window in Delphi?

For full screenshots, I use this code:
form1.Hide;
sleep(500);
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);
form1.Show ;
FileName := 'Screenshot_'+FormatDateTime('mm-dd-yyyy-hhnnss',now());
bmp.SaveToFile(Format('C:\Screenshots\%s.bmp', [FileName]));
ReleaseDC(GetDesktopWindow, DCDesk);
bmp.Free;
How can I convert that to take a screenshot of only the active window.

First of all you have to get the right window. As sharptooth already noted you should use GetForegroundWindow instead of GetDesktopWindow. You have done it right in your improved version.
But then you have to resize your bitmap to the actual size of the DC/Window. You haven't done this yet.
And then make sure you don't capture some fullscreen window!
When I executed your code, my Delphi IDE was captured and as it is on fullscreen by default, it created the illusion of a fullscreen screenshot. (Even though your code is mostly correct)
Considering the above steps, I was successfully able to create a single-window screenshot with your code.
Just a hint: You can GetDC instead of GetWindowDC if you are only interested in the client area. (No window borders)
EDIT: Here's what I made with your code:
You should not use this code! Look at the improved version below.
procedure TForm1.Button1Click(Sender: TObject);
const
FullWindow = True; // Set to false if you only want the client area.
var
hWin: HWND;
dc: HDC;
bmp: TBitmap;
FileName: string;
r: TRect;
w: Integer;
h: Integer;
begin
form1.Hide;
sleep(500);
hWin := GetForegroundWindow;
if FullWindow then
begin
GetWindowRect(hWin,r);
dc := GetWindowDC(hWin) ;
end else
begin
Windows.GetClientRect(hWin, r);
dc := GetDC(hWin) ;
end;
w := r.Right - r.Left;
h := r.Bottom - r.Top;
bmp := TBitmap.Create;
bmp.Height := h;
bmp.Width := w;
BitBlt(bmp.Canvas.Handle, 0, 0, w, h, DC, 0, 0, SRCCOPY);
form1.Show ;
FileName := 'Screenshot_'+FormatDateTime('mm-dd-yyyy-hhnnss',now());
bmp.SaveToFile(Format('C:\Screenshots\%s.bmp', [FileName]));
ReleaseDC(hwin, DC);
bmp.Free;
end;
EDIT 2: As requested I'm adding a better version of the code, but I'm keeping the old one as a reference. You should seriously consider using this instead of your original code. It'll behave much nicer in case of errors. (Resources are cleaned up, your form will be visible again, ...)
procedure TForm1.Button1Click(Sender: TObject);
const
FullWindow = True; // Set to false if you only want the client area.
var
Win: HWND;
DC: HDC;
Bmp: TBitmap;
FileName: string;
WinRect: TRect;
Width: Integer;
Height: Integer;
begin
Form1.Hide;
try
Application.ProcessMessages; // Was Sleep(500);
Win := GetForegroundWindow;
if FullWindow then
begin
GetWindowRect(Win, WinRect);
DC := GetWindowDC(Win);
end else
begin
Windows.GetClientRect(Win, WinRect);
DC := GetDC(Win);
end;
try
Width := WinRect.Right - WinRect.Left;
Height := WinRect.Bottom - WinRect.Top;
Bmp := TBitmap.Create;
try
Bmp.Height := Height;
Bmp.Width := Width;
BitBlt(Bmp.Canvas.Handle, 0, 0, Width, Height, DC, 0, 0, SRCCOPY);
FileName := 'Screenshot_' +
FormatDateTime('mm-dd-yyyy-hhnnss', Now());
Bmp.SaveToFile(Format('C:\Screenshots\%s.bmp', [FileName]));
finally
Bmp.Free;
end;
finally
ReleaseDC(Win, DC);
end;
finally
Form1.Show;
end;
end;

Your code could be a lot simpler. When you have decided on which form you want to save, try the code I use:
procedure SaveFormBitmapToBMPFile( AForm : TCustomForm; AFileName : string = '' );
// Copies this form's bitmap to the specified file
var
Bitmap: TBitMap;
begin
Bitmap := AForm.GetFormImage;
try
Bitmap.SaveToFile( AFileName );
finally
Bitmap.Free;
end;
end;

This combines all the approaches described so far. It also handles multiple-monitor scenarios.
Pass in the kind of screenshot you want, and a TJpegImage, and it will assign your requested screenshot to that image.
///////////
uses
Jpeg;
type //define an ENUM to describe the possible screenshot types.
TScreenShotType = (sstActiveWindow, sstActiveClientArea,
sstPrimaryMonitor, sstDesktop);
///////////
procedure TfrmMain.GetScreenShot(shotType: TScreenShotType;
var img: TJpegImage);
var
w,h: integer;
DC: HDC;
hWin: Cardinal;
r: TRect;
tmpBmp: TBitmap;
begin
hWin := 0;
case shotType of
sstActiveWindow:
begin
//only the active window
hWin := GetForegroundWindow;
dc := GetWindowDC(hWin);
GetWindowRect(hWin,r);
w := r.Right - r.Left;
h := r.Bottom - r.Top;
end; //sstActiveWindow
sstActiveClientArea:
begin
//only the active client area (active window minus title bars)
hWin := GetForegroundWindow;
dc := GetDC(hWin);
GetWindowRect(hWin,r);
w := r.Right - r.Left;
h := r.Bottom - r.Top;
end; //sstActiveClientArea
sstPrimaryMonitor:
begin
//only the primary monitor. If 1 monitor, same as sstDesktop.
hWin := GetDesktopWindow;
dc := GetDC(hWin);
w := GetDeviceCaps(DC,HORZRES);
h := GetDeviceCaps(DC,VERTRES);
end; //sstPrimaryMonitor
sstDesktop:
begin
//ENTIRE desktop (all monitors)
dc := GetDC(GetDesktopWindow);
w := Screen.DesktopWidth;
h := Screen.DesktopHeight;
end; //sstDesktop
else begin
Exit;
end; //case else
end; //case
//convert to jpg
tmpBmp := TBitmap.Create;
try
tmpBmp.Width := w;
tmpBmp.Height := h;
BitBlt(tmpBmp.Canvas.Handle,0,0,tmpBmp.Width,
tmpBmp.Height,DC,0,0,SRCCOPY);
img.Assign(tmpBmp);
finally
ReleaseDC(hWin,DC);
FreeAndNil(tmpBmp);
end; //try-finally
end;

JCL comes to the rescue once again..
hwnd := GetForegroundWindow;
Windows.GetClientRect(hwnd, r);
JclGraphics.ScreenShot(theBitmap, 0, 0, r.Right - r.Left, r.Bottom - r.Top, hwnd);
// use theBitmap...

Thank you for this useful submission I thought I might make the code offered into a unit to use all over my application, here is the code I have running on DX10.2 Tokyo. Please note the example, watch out for memory leaks.
unit ScreenCapture;
interface
uses Windows, Vcl.Controls, Vcl.StdCtrls, VCL.Graphics,VCL.Imaging.JPEG, VCL.Forms;
function getScreenCapture( FullWindow: Boolean = True ) : TBitmap;
implementation
function getScreenCapture( FullWindow: Boolean ) : TBitmap;
var
Win: HWND;
DC: HDC;
WinRect: TRect;
Width: Integer;
Height: Integer;
begin
Result := TBitmap.Create;
//Application.ProcessMessages; // Was Sleep(500);
Win := GetForegroundWindow;
if FullWindow then
begin
GetWindowRect(Win, WinRect);
DC := GetWindowDC(Win);
end
else
begin
Windows.GetClientRect(Win, WinRect);
DC := GetDC(Win);
end;
try
Width := WinRect.Right - WinRect.Left;
Height := WinRect.Bottom - WinRect.Top;
Result.Height := Height;
Result.Width := Width;
BitBlt(Result.Canvas.Handle, 0, 0, Width, Height, DC, 0, 0, SRCCOPY);
finally
ReleaseDC(Win, DC);
end;
end;
end.
Example :
//Any event or button click, screenCapture is a TBitmap
screenCapture := getScreenCapture();
try
//Do some things with screen capture
Image1.Picture.Graphic := screenCapture;
finally
screenCapture.Free;
end;

Use GetForegroundWindow() instead of GetDesktopWindow().
You'll have to save the handle which GetForegroundWindow() return and pass the saved value into ReleaseDC() - to be sure that GetWindowDC() and ReleaseDC() are called exactly for the same window in case the active window changes between calls.

In case anyone is looking for a more cross-platform solution, this one claims Windows and MacOS-X support:
https://github.com/z505/screenshot-delphi

The shortest version of the Brian Frost code:
Screen.ActiveForm.GetFormImage.SaveToFile(Screen.ActiveForm.Caption+'.bmp');
Just one line of the code (Screenshot of the active window in the MDI application).

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how to retrieve exact text width for RenderText in Graphics32 - delphi

I think my question is clear enough, but I explain more. Simply, when we are using AntiAlias on RenderText procedure, the value gotten within TextWidth function is not correct. What can I do to get the right text width?

You can also use the Windows API function GetTextExtentPoint32 Do some google to find example on Delphi

Related

How to take a screenshot of the Active Window in Delphi 10? [duplicate]

How to put textout in an area?

Delphi image canvas... paint an area (triangle, rectangle, polygons)

Is it possible to determine if the text in a dbEdit is longer than what is visible?

How to take a screenshot of the Active Window in Delphi?

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