优快云问答：用UrlDownloadToFile下载时得到下载的进度（转载）-优快云博客

博客展示了TfrmUpdate类的定义，包含多个组件及事件处理过程，还定义了多个私有和公共函数。同时给出了GetHTMLFile等函数的具体实现，部分函数返回E_NOTIMPL。最后给出了一个网址。

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frmUpdate = class(TForm,IBindStatusCallback)
ImgTop: TImage;
LblTop: TLabel;
SpdBtnClose: TSpeedButton;
Bevel1: TBevel;
plStatus: TPanel;
plInfo: TPanel;
btnCancel: TFlatSpeedButton;
tmrUdapte: TTimer;
plProgress: TPanel;
procedure tmrUdapteTimer(Sender: TObject);
procedure btnCancelClick(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure ImgTopMouseMove(Sender: TObject; Shift: TShiftState; X,Y: Integer);
procedure SpdBtnCloseClick(Sender: TObject);
private
function OnStartBinding(dwReserved: DWORD; pib: IBinding): HResult; stdcall;
function GetPriority(out nPriority): HResult; stdcall;
function OnLowResource(reserved: DWORD): HResult; stdcall;
function OnProgress(ulProgress, ulProgressMax, ulStatusCode: ULONG;szStatusText: LPCWSTR): HResult; stdcall;
function OnStopBinding(hresult: HResult; szError: LPCWSTR): HResult; stdcall;
function GetBindInfo(out grfBINDF: DWORD; var bindinfo: TBindInfo): HResult; stdcall;
function OnDataAvailable(grfBSCF: DWORD; dwSize: DWORD; formatetc: PFormatEtc;stgmed: PStgMedium): HResult; stdcall;
function OnObjectAvailable(const iid: TGUID; punk: IUnknown): HResult; stdcall;
function GetHTMLFile(URL, FileName: string): HRESULT;
public
{ Public declarations }
end;

//------------------------------------------------------------------------------
function TfrmUpdate.GetHTMLFile( URL , FileName : string) : HRESULT;
var
status : IBindStatusCallback ;
begin
status := IBindStatusCallback(self);
result := UrlDownLoadToFile(nil, pChar( URL ) ,pChar( FileName ),0 ,Status );
end;

//------------------------------------------------------------------------------
function TfrmUpdate.GetBindInfo(out grfBINDF: DWORD;
var bindinfo: TBindInfo): HResult;
begin
result := E_NOTIMPL;
end;

//------------------------------------------------------------------------------
function TfrmUpdate.GetPriority(out nPriority): HResult;
begin
result := E_NOTIMPL;
end;

//------------------------------------------------------------------------------
function TfrmUpdate.OnDataAvailable(grfBSCF, dwSize: DWORD;
formatetc: PFormatEtc; stgmed: PStgMedium): HResult;
begin
result := E_NOTIMPL;
end;

//------------------------------------------------------------------------------
function TfrmUpdate.OnLowResource(reserved: DWORD): HResult;
begin
result := E_NOTIMPL;
end;

//------------------------------------------------------------------------------
function TfrmUpdate.OnObjectAvailable(const iid: TGUID;
punk: IInterface): HResult;
begin
result := E_NOTIMPL;
end;

//------------------------------------------------------------------------------
function TfrmUpdate.OnStartBinding(dwReserved: DWORD;
pib: IBinding): HResult;
begin
result := E_NOTIMPL;
end;

//------------------------------------------------------------------------------
function TfrmUpdate.OnStopBinding(hresult: HResult;
szError: LPCWSTR): HResult;
begin
result := E_NOTIMPL;
end;

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