Delphi 7-未捕获表单的屏幕截图-Windows 8-DWM.exe

朋友们

需要截图的所有桌面并没有我的形式和加载在TImage。 在Windows XP中成功，7-只需ALPHABLEND=TRUE+屏幕截图程序

但是相同的代码在Windows8中不起作用-捕获包括表单在内的所有屏幕

我知道这个问题与AERO-DWM.EXE-成功使用pssupend.EXE（sysinternals）-挂起winlogon.EXE并杀死DWM.EXE有关

有人可以告诉我如何在Windows 8中捕获所有没有表单的桌面

prntscr.com/314rix-在WIN7中成功

prntscr.com/314tj7-在WIN8中失败

prntscr com/31502u-在WIN8中挂起WINLOGON.EXE并杀死DWM.EXE

www-sendspace-com/file/b5oxhb-源代码

// FORM -> ALPHABLEND -> TRUE


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls,
  Clipbrd;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Image1: TImage;
    ScrollBox1: TScrollBox;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure ScreenShot(DestBitmap: TBitmap);
var
  DC: HDC;
begin
  DC:=GetDC(GetDesktopWindow);
  try
    DestBitmap.Width:=GetDeviceCaps(DC, HORZRES);
    DestBitmap.Height:=GetDeviceCaps(DC, VERTRES);
    BitBlt(DestBitmap.Canvas.Handle,0,0,DestBitmap.Width,DestBitmap.Height,DC,0,0,SRCCOPY);
  finally
    ReleaseDC(GetDesktopWindow, DC);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ScreenShot(Image1.Picture.Bitmap);
end;

end.

---

如果要在不显示窗口的情况下拍摄屏幕快照：在拍摄屏幕快照之前隐藏窗口：

procedure TForm1.Button1Click(Sender: TObject);
var
    desktop: TGraphic;
    fDisable: BOOL;
begin
    {
        Capture a screenshot without this window showing
    }
    //Disable DWM transactions so the window hides immediately
    if DwmApi.DwmCompositionEnabled then
    begin
        fDisable := True;
        OleCheck(DwmSetWindowAttribute(Self.Handle, DWMWA_TRANSITIONS_FORCEDISABLED, @fDisable, sizeof(fDisable)));
    end;
    try
        //Hide the window
        Self.Hide;
        try
            //Capture the desktop
            desktop := CaptureDesktop;
        finally
            //Re-show our window
            Self.Show;
        end;
    finally
        //Restore animation transitions
        if DwmApi.DwmCompositionEnabled then
        begin
            fDisable := False;
            DwmSetWindowAttribute(Self.Handle, DWMWA_TRANSITIONS_FORCEDISABLED, @fDisable, sizeof(fDisable));
        end;
    end;

    //Save the screenshot somewhere
    desktop.SaveToFile('d:\temp\ss.bmp');
end;

随着魔法的发生：

function CaptureDesktop: TGraphic;
const
    CAPTUREBLT = $40000000;
    SM_XVIRTUALSCREEN        = 76;
    SM_YVIRTUALSCREEN        = 77;
    SM_CXVIRTUALSCREEN       = 78;
    SM_CYVIRTUALSCREEN       = 79;
var
    nDesktopWidth, nDesktopHeight: Integer;
    tmpBmp: TBitmap;
    hwndDesktop: HWND;
    dcDesktop: HDC;
begin
    Result := nil;

    {
        GetWindowRect(GetDesktopWindow)
        is completely wrong. It will intentionally return only the rectangle of the primary monotor. See MSDN.
    }

    { Cannot handle dpi virtualization
    //Get the rect of the entire desktop; not just the primary monitor
    ZeroMemory(@desktopRect, SizeOf(desktopRect));
    for i := 0 to Screen.MonitorCount-1 do
    begin
        desktopRect.Top := Min(desktopRect.Top, Screen.Monitors[i].Top);
        desktopRect.Bottom := Max(desktopRect.Bottom, Screen.Monitors[i].Top + Screen.Monitors[i].Height);
        desktopRect.Left := Min(desktopRect.Left, Screen.Monitors[i].Left);
        desktopRect.Right := Max(desktopRect.Right, Screen.Monitors[i].Left + Screen.Monitors[i].Width);
    end;

    //Get the size of the entire desktop
    nDesktopWidth := (desktopRect.Right - desktopRect.Left);
    nDesktopHeight := (desktopRect.Bottom - desktopRect.Top);
    }

    //Also doesn't handle dpi virtualization; but is shorter and unioning rects
    nDesktopWidth := GetSystemMetrics(SM_CXVIRTUALSCREEN);
    nDesktopHeight := GetSystemMetrics(SM_CYVIRTUALSCREEN);

    tmpBmp:= TBitmap.Create;
    try
        tmpBmp.Width := nDesktopWidth;
        tmpBmp.Height := nDesktopHeight;

        //dcDesktop := GetDC(0); //
        hwndDesktop := GetDesktopWindow;
        dcDesktop := GetDC(hwndDesktop); //GetWindowDC(0) returns the DC of the primary monitor (not what we want)
        if dcDesktop = 0 then
            Exit;
        try
            if not BitBlt(tmpBmp.Canvas.Handle, 0, 0, nDesktopWidth, nDesktopHeight, dcDesktop, 0, 0, SRCCOPY or CAPTUREBLT) then
                Exit;
        finally
            ReleaseDC(0, dcDesktop);
        end;
    except
        tmpBmp.Free;
        raise;
    end;
//  CaptureScreenShot(GetDesktopWindow, Image, false);

    Result := tmpBmp;
end;

运行应用程序的屏幕：

以及保存的屏幕截图：

procedure TForm1.Button1Click(Sender: TObject);
var
    desktop: TGraphic;
    fDisable: BOOL;
begin
    {
        Capture a screenshot without this window showing
    }
    //Disable DWM transactions so the window hides immediately
    if DwmApi.DwmCompositionEnabled then
    begin
        fDisable := True;
        OleCheck(DwmSetWindowAttribute(Self.Handle, DWMWA_TRANSITIONS_FORCEDISABLED, @fDisable, sizeof(fDisable)));
    end;
    try
        //Hide the window
        Self.Hide;
        try
            //Capture the desktop
            desktop := CaptureDesktop;
        finally
            //Re-show our window
            Self.Show;
        end;
    finally
        //Restore animation transitions
        if DwmApi.DwmCompositionEnabled then
        begin
            fDisable := False;
            DwmSetWindowAttribute(Self.Handle, DWMWA_TRANSITIONS_FORCEDISABLED, @fDisable, sizeof(fDisable));
        end;
    end;

    //Save the screenshot somewhere
    desktop.SaveToFile('d:\temp\ss.bmp');
end;

注意：发布到公共域的任何代码。无需归因

---

你能解释一下代码的哪一部分不包括你的表单吗？只设置“AlphaBlend=True”表单就已经消失在屏幕截图中了。这是一个相当弱的方法。如果屏幕上的另一个窗体也这样做呢？它还对你的应用程序造成了毫无意义的性能冲击。