如何使用Delphi 7在状态/任务栏按钮上显示进度?

前端之家收集整理的这篇文章主要介绍了如何使用Delphi 7在状态/任务栏按钮上显示进度?前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。
如果您在 Windows 7下复制文件,您将看到一个进度条中复制的进度显示在应用程序的状态或任务栏按钮中.

可以使用Delphi 7实现吗?

我有一些漫长的操作,这将非常适合展示它的进步.

使用Total Commander的副本样品

.

解决方法

使用 ITaskbarList3接口,特别是 SetProgressStateSetProgressValue方法.使用指定CLSID_TaskbarList和IID_ITaskbarList3的CoCreateInstance()来访问接口.

例如:

type
  ITaskbarList = interface(IUnknown) 
    ['{56FDF342-FD6D-11D0-958A-006097C9A090}']
    function HrInit: HRESULT; stdcall;
    function AddTab(hwnd: HWND): HRESULT; stdcall;
    function DeleteTab(hwnd: HWND): HRESULT; stdcall;
    function ActivateTab(hwnd: HWND): HRESULT; stdcall;
    function SetActiveAlt(hwnd: HWND): HRESULT; stdcall;
  end;

  ITaskbarList2 = interface(ITaskbarList) 
    ['{602D4995-B13A-429B-A66E-1935E44F4317}']
    function MarkFullscreenWindow(hwnd: HWND; 
      fFullscreen: BOOL): HRESULT; stdcall;
  end;

  THUMBBUTTON = record 
    dwMask: DWORD;
    iId: UINT;
    iBitmap: UINT;
    hIcon: HICON;
    szTip: packed array[0..259] of WCHAR;
    dwFlags: DWORD;
  end;
  TThumbButton = THUMBBUTTON;
  PThumbButton = ^TThumbButton;

  ITaskbarList3 = interface(ITaskbarList2) 
    ['{EA1AFB91-9E28-4B86-90E9-9E9F8A5EEFAF}']
    function SetProgressValue(hwnd: HWND; ullCompleted: ULONGLONG; 
      ullTotal: ULONGLONG): HRESULT; stdcall;
    function SetProgressState(hwnd: HWND; 
      tbpFlags: Integer): HRESULT; stdcall;
    function RegisterTab(hwndTab: HWND; hwndMDI: HWND): HRESULT; stdcall;
    function UnregisterTab(hwndTab: HWND): HRESULT; stdcall;
    function SetTabOrder(hwndTab: HWND; 
      hwndInsertBefore: HWND): HRESULT; stdcall;
    function SetTabActive(hwndTab: HWND; hwndMDI: HWND; 
      tbatFlags: Integer): HRESULT; stdcall;
    function ThumbBarAddButtons(hwnd: HWND; cButtons: UINT;
      pButton: PThumbButton): HRESULT; stdcall;
    function ThumbBarUpdateButtons(hwnd: HWND; cButtons: UINT;
      pButton: PThumbButton): HRESULT; stdcall;
    function ThumbBarSetImageList(hwnd: HWND; 
      himl: HIMAGELIST): HRESULT; stdcall;
    function SetOverlayIcon(hwnd: HWND; hIcon: HICON; 
      pszDescription: LPCWSTR): HRESULT; stdcall;
    function SetThumbnailTooltip(hwnd: HWND; 
      pszTip: LPCWSTR): HRESULT; stdcall;
    function SetThumbnailClip(hwnd: HWND; 
      var prcClip: TRect): HRESULT; stdcall;
  end;

const
  CLSID_TaskbarList: TGUID = '{56FDF344-FD6D-11d0-958A-006097C9A090}';
  TBPF_NOPROGRESS    = 0; 
  TBPF_INDETERMINATE = $1; 
  TBPF_NORMAL        = $2; 
  TBPF_ERROR         = $4; 
  TBPF_PAUSED        = $8; 

var
  TBL: ITaskbarList3;
  I: Integer;
begin
  CoCreateInstance(CLSID_TaskbarList,nil,CLSCTX_INPROC,ITaskbarList3,TBL);

  if (TBL <> nil) then 
    TBL.SetProgressState(Application.Handle,TBPF_INDETERMINATE);
  try
    for I := 0 to 100 do
    begin
      if (TBL <> nil) then 
        TBL.SetProgressValue(Application.Handle,I,100);
      Sleep(1000);
    end;
  finally
    if (TBL <> nil) then 
      TBL.SetProgressState(Application.Handle,TBPF_NOPROGRESS);
  end;
end;
原文链接:https://www.f2er.com/delphi/102694.html

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