Downloads bits from the Internet and saves them to a file.

Delphi 语言版本

⒈uses UrlMon;

⒉//-------------------------------------------------------------------------------

⒊function DownloadFile(SourceFile, DestFile: string): Boolean;

⒋// 参数 下载文件路径, 保存文件路径

⒌// 返回 下载结果

⒍begin

⒎try

⒏　Result := UrlDownloadToFile(nil, PChar(SourceFile), PChar(DestFile), 0, nil) = 0;

⒐except

⒑　Result := False;

⒒end;

⒓end;

函数调用：

⒈var

⒉　url,destFile:string;

⒊url := 'http****filename.rar'

⒋destFile := 'E:\\filename.rar'

⒌if DownloadFile(url, DestFile) then

⒍begin

⒎　ShowMessage('保存成功！');

⒏end

⒐else

⒑begin

⒒　ShowMessage('保存不成功！');

⒓end;

C++语言版本：

Syntax:

HRESULT URLDownloadToFile( LPUNKNOWN pCaller,

LPCTSTR szURL,

LPCTSTR szFileName,

DWORD dwReserved,

LPBINDSTATUSCALLBACK lpfnCB

);

Parameters:

pCaller Pointer to the controlling IUnknown interface of the calling Microsoft ActiveX component (if the caller is an ActiveX component). //控件的接口,如果不是控件则为0.

szURL

Pointer to a string value containing the URL to be downloaded. Cannot be set to NULL

//要下载的url地址,不能为空.

szFileName

Pointer to a string value containing the name of the file to create for bits that come from the download.

//下载后保存的文件名.

dwReserved

Reserved. Must be set to 0.

//保留字段,必需为0

lpfnCB

Pointer to the caller's IBindStatusCallback interface. URLDownloadToFile calls this interface's IBindStatusCallback::OnProgress method on a connection activity, including the arrival of data. IBindStatusCallback::OnDataAvailable is never called.

//下载进度状态回调

Return Value

Returns one of the following values.

S_OK : The download started successfully.

E_OUTOFMEMORY: The buffer length is invalid, or there is insufficient memory to complete the operation.

INET_E_DOWNLOAD_FAILURE:The specified resource or callback interface was invalid.

Example:

#include "stdafx.h"

#include <iostream>

#include <UrlMon.h>

#pragma comment(lib, "urlmon.lib")　using namespace std;

int _tmain(int argc, _TCHAR* argv[])

{

//nt * dl = new int;

HRESULT hr = URLDownloadToFile(0, _T("***ui.the9.**/wowshell/WoWShell.exe"),_T ("D:\\\\WoWShell.exe"), 0,NULL);

if (hr== S_OK)

{

cout<< "ok"<< endl;

}

return 0;

}

vb语言版本：

该函数是VB的一个用来调用API进行网络下载的函数，过程如下：

后台下载

声明：

Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long

'//调用

然后在代码里直接调用：

Call URLDownloadToFile(0, "网页地址", "保存到本地文件名和地址", 0, 0)

如

Call URLDownloadToFile(0, "*****.baidu**/", "c:\\1.htm", 0, 0)

相当于另存为

声明：

Private Declare Function DoFileDownload Lib "shdocvw.dll"(ByVal lpszFile As String) As Long

'//调用

然后在代码里直接调用：

Dim gourl As String

gourl = StrConv("网页地址", vbUnicode)

Call DoFileDownload(gourl)