如何采取与FireMonkey（多平台）的屏幕截图(How to take a screenshot

2019-06-23 22:12发布

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我还没有找到一个功能FMX.Platform获得的截图（反正无处...）。

随着VCL，有很多答案（计算器，谷歌，...）。

但如何获得Windows和Mac OS X的图像（位图或其他）的屏幕截图？

问候，

W.

更新： 从Tipiweb链接给出了OS X的一个很好的解决方案

关于Windows的一部分：我有编码，但我不喜欢使用VCL，和流来实现它...任何更好的建议，意见？

谢谢。

W. 

uses ..., FMX.Types, Winapi.Windows, Vcl.Graphics;

...

function DesktopLeft: Integer;
begin
  Result := GetSystemMetrics(SM_XVIRTUALSCREEN);
end;

function DesktopWidth: Integer;
begin
  Result := GetSystemMetrics(SM_CXVIRTUALSCREEN);
end;

function DesktopTop: Integer;
begin
  Result := GetSystemMetrics(SM_YVIRTUALSCREEN);
end;

function DesktopHeight: Integer;
begin
  Result := GetSystemMetrics(SM_CYVIRTUALSCREEN);
end;


procedure GetScreenShot(var dest: FMX.Types.TBitmap);
var
  cVCL  : Vcl.Graphics.TCanvas;
  bmpVCL: Vcl.Graphics.TBitmap;
  msBmp : TMemoryStream;
begin
  bmpVCL      := Vcl.Graphics.TBitmap.Create;
  cVCL        := Vcl.Graphics.TCanvas.Create;
  cVCL.Handle := GetWindowDC(GetDesktopWindow);
  try
    bmpVCL.Width := DesktopWidth;
    bmpVCL.Height := DesktopHeight;
    bmpVCL.Canvas.CopyRect(Rect(0, 0, DesktopWidth, DesktopHeight),
                           cVCL,
                           Rect(DesktopLeft, DesktopTop, DesktopLeft + DesktopWidth, DesktopTop + DesktopHeight)
                          );
  finally
    ReleaseDC(0, cVCL.Handle);
    cVCL.Free;
  end;

  msBmp := TMemoryStream.Create;
  try
    bmpVCL.SaveToStream(msBmp);
    msBmp.Position := 0;
    dest.LoadFromStream(msBmp);
  finally
    msBmp.Free;
  end;

Answer 1:

我建立了一个小的应用程序采取截图（Windows / Mac的）和它的作品:-)！

为Windows和Mac兼容，我用的流。

API的Mac捕获- > T流

API的Windows捕获- > Vcl.Graphics.TBitmap - > T流。

在那之后，我打开我的Windows或Mac T流在FMX.Types.TBitmap（自流负载）

窗口单位代码： 

unit tools_WIN;

interface
{$IFDEF MSWINDOWS}
uses Classes {$IFDEF MSWINDOWS} , Windows {$ENDIF}, System.SysUtils, FMX.Types, VCL.Forms, VCL.Graphics;


  procedure TakeScreenshot(Dest: FMX.Types.TBitmap);
{$ENDIF MSWINDOWS}

implementation

{$IFDEF MSWINDOWS}


procedure WriteWindowsToStream(AStream: TStream);
var
  dc: HDC; lpPal : PLOGPALETTE;
  bm: TBitMap;
begin
{test width and height}
  bm := TBitmap.Create;

  bm.Width := Screen.Width;
  bm.Height := Screen.Height;

  //get the screen dc
  dc := GetDc(0);
  if (dc = 0) then exit;
 //do we have a palette device?
  if (GetDeviceCaps(dc, RASTERCAPS) AND RC_PALETTE = RC_PALETTE) then
  begin
    //allocate memory for a logical palette
    GetMem(lpPal, sizeof(TLOGPALETTE) + (255 * sizeof(TPALETTEENTRY)));
    //zero it out to be neat
    FillChar(lpPal^, sizeof(TLOGPALETTE) + (255 * sizeof(TPALETTEENTRY)), #0);
    //fill in the palette version
    lpPal^.palVersion := $300;
    //grab the system palette entries
    lpPal^.palNumEntries :=GetSystemPaletteEntries(dc,0,256,lpPal^.palPalEntry);
    if (lpPal^.PalNumEntries <> 0) then
    begin
      //create the palette
      bm.Palette := CreatePalette(lpPal^);
    end;
    FreeMem(lpPal, sizeof(TLOGPALETTE) + (255 * sizeof(TPALETTEENTRY)));
  end;
  //copy from the screen to the bitmap
  BitBlt(bm.Canvas.Handle,0,0,Screen.Width,Screen.Height,Dc,0,0,SRCCOPY);

  bm.SaveToStream(AStream);

  FreeAndNil(bm);
  //release the screen dc
  ReleaseDc(0, dc);
end;


procedure TakeScreenshot(Dest: FMX.Types.TBitmap);
var
  Stream: TMemoryStream;
begin
  try
    Stream := TMemoryStream.Create;
    WriteWindowsToStream(Stream);
    Stream.Position := 0;
    Dest.LoadFromStream(Stream);
  finally
    Stream.Free;
  end;
end;

{$ENDIF MSWINDOWS}
end.

MAC单元代码： 

unit tools_OSX;


interface
{$IFDEF MACOS}
uses

  Macapi.CoreFoundation, Macapi.CocoaTypes, Macapi.CoreGraphics, Macapi.ImageIO,
  FMX.Types,
  system.Classes, system.SysUtils;

  procedure TakeScreenshot(Dest: TBitmap);
{$ENDIF MACOS}

implementation
{$IFDEF MACOS}

{$IF NOT DECLARED(CGRectInfinite)}
const
  CGRectInfinite: CGRect = (origin: (x: -8.98847e+30; y: -8.98847e+307);
    size: (width: 1.79769e+308; height: 1.79769e+308));
{$IFEND}


function PutBytesCallback(Stream: TStream; NewBytes: Pointer;
  Count: LongInt): LongInt; cdecl;
begin
  Result := Stream.Write(NewBytes^, Count);
end;

procedure ReleaseConsumerCallback(Dummy: Pointer); cdecl;
begin
end;

procedure WriteCGImageToStream(const AImage: CGImageRef; AStream: TStream;
  const AType: string = 'public.png'; AOptions: CFDictionaryRef = nil);
var
  Callbacks: CGDataConsumerCallbacks;
  Consumer: CGDataConsumerRef;
  ImageDest: CGImageDestinationRef;
  TypeCF: CFStringRef;
begin
  Callbacks.putBytes := @PutBytesCallback;
  Callbacks.releaseConsumer := ReleaseConsumerCallback;
  ImageDest := nil;
  TypeCF := nil;
  Consumer := CGDataConsumerCreate(AStream, @Callbacks);
  if Consumer = nil then RaiseLastOSError;
  try
    TypeCF := CFStringCreateWithCharactersNoCopy(nil, PChar(AType), Length(AType),
      kCFAllocatorNull); //wrap the Delphi string in a CFString shell
    ImageDest := CGImageDestinationCreateWithDataConsumer(Consumer, TypeCF, 1, AOptions);
    if ImageDest = nil then RaiseLastOSError;
    CGImageDestinationAddImage(ImageDest, AImage, nil);
    if CGImageDestinationFinalize(ImageDest) = 0 then RaiseLastOSError;
  finally
    if ImageDest <> nil then CFRelease(ImageDest);
    if TypeCF <> nil then CFRelease(TypeCF);
    CGDataConsumerRelease(Consumer);
  end;
end;

procedure TakeScreenshot(Dest: TBitmap);
var
  Screenshot: CGImageRef;
  Stream: TMemoryStream;
begin
  Stream := nil;
  ScreenShot := CGWindowListCreateImage(CGRectInfinite,
    kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault);
  if ScreenShot = nil then RaiseLastOSError;
  try
    Stream := TMemoryStream.Create;
    WriteCGImageToStream(ScreenShot, Stream);
    Stream.Position := 0;
    Dest.LoadFromStream(Stream);
  finally
    CGImageRelease(ScreenShot);
    Stream.Free;
  end;
end;



 {$ENDIF MACOS}
end.

在你的MainForm单位： 

...
{$IFDEF MSWINDOWS}
  uses tools_WIN;
{$ELSE}
  uses tools_OSX;
{$ENDIF MSWINDOWS}

...
var
  imgDest: TImageControl;
...
TakeScreenshot(imgDest.Bitmap);

如果您有其他的想法，请跟我:-)



Answer 2:

由于Tipiweb的代码（他的回答），一个GitHub的项目已在此基础上开始; 与一些改进（能力获取屏幕截图仅在一定的窗口，或采取一个完整的屏幕截图）。

该单元被命名为xscreenshot.pas（适用于所有平台的单一单元）

GitHub的项目页面：

  • https://github.com/z505/screenshot-delphi

在本单位提供的实用程序： 

// take screenshot of full screen
procedure TakeScreenshot(...)
// take screenshot only of a specific window
procedure TakeWindowShot(...)

在Mac OS收尾需要采取特定的窗口截图一些工作。

再次，感谢Tipiweb他的回答得到该项目的启动。



Answer 3:

您可以使用一个很好的解决方案，从这个网站做的Mac OSX屏幕截图。

不要与Windows API这样相同的工作： 

procedure ScreenShot(x, y, Width, Height: integer; bm: TBitMap);
var
  dc: HDC; lpPal : PLOGPALETTE;
begin
{test width and height}
  if ((Width = 0) OR (Height = 0)) then exit;
  bm.Width := Width;
  bm.Height := Height;
  //get the screen dc
  dc := GetDc(0);
  if (dc = 0) then exit;
 //do we have a palette device?
  if (GetDeviceCaps(dc, RASTERCAPS) AND RC_PALETTE = RC_PALETTE) then
  begin
    //allocate memory for a logical palette
    GetMem(lpPal, sizeof(TLOGPALETTE) + (255 * sizeof(TPALETTEENTRY)));
    //zero it out to be neat
    FillChar(lpPal^, sizeof(TLOGPALETTE) + (255 * sizeof(TPALETTEENTRY)), #0);
    //fill in the palette version
    lpPal^.palVersion := $300;
    //grab the system palette entries
    lpPal^.palNumEntries :=GetSystemPaletteEntries(dc,0,256,lpPal^.palPalEntry);
    if (lpPal^.PalNumEntries <> 0) then
    begin
      //create the palette
      bm.Palette := CreatePalette(lpPal^);
    end;
    FreeMem(lpPal, sizeof(TLOGPALETTE) + (255 * sizeof(TPALETTEENTRY)));
  end;
  //copy from the screen to the bitmap
  BitBlt(bm.Canvas.Handle,0,0,Width,Height,Dc,x,y,SRCCOPY);

  //release the screen dc
  ReleaseDc(0, dc);
end;

在此之后，包括您不同的单位： 

uses
{$IFDEF MSWINDOWS}
   mytools_win,
{$ENDIF MSWINDOWS}

{$IFDEF MACOS}
   mytools_mac,
{$ENDIF MACOS}


文章来源: How to take a screenshot with FireMonkey (multi-platforms)
标签： delphi screenshot delphi-xe2 firemonkey
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