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【C】无需计数的批量下载网络文件

作者:章毅明 / 发布于2013/10/11/ 797


	// BatchDownloader.cpp : Defines the entry point for the console application.
	//

	#include "stdafx.h"
	#include <string>
	#include <winsock2.h>
	#include <wininet.h>
	#define MAXBLOCKSIZE 1024
	#pragma comment( lib, "wininet.lib" )

	typedef unsigned char byte;

	using namespace std;

	void DownloadFile(const char *Url,const char *save_as)/*将Url指向的地址的文件下载到save_as指向的本地文件*/
	{
	byte Temp[MAXBLOCKSIZE];
	ULONG Number = 1;
	FILE *stream;
	HINTERNET hSession = InternetOpen((LPCSTR)"RookIE/1.0", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
	if (hSession != NULL)
	{
	 HINTERNET handle2 = InternetOpenUrl(hSession, (LPCSTR)Url, NULL, 0, INTERNET_FLAG_DONT_CACHE, 0);
	 if (handle2 != NULL)
	 {
	 if( (stream = fopen( save_as, "wb" )) != NULL )
	 {
	 while (Number > 0)
	 {
	 InternetReadFile(handle2, Temp, MAXBLOCKSIZE - 1, &Number);
	 fwrite(Temp, sizeof (char), Number , stream);
	 }
	 fflush( stream );
	 fclose( stream );
	 }
	 InternetCloseHandle(handle2);
	 handle2 = NULL;
	 }
	 InternetCloseHandle(hSession);
	 hSession = NULL;
	}
	}

	int main(int argc, char* argv[])
	{
	char const* downfiles[]={
	 "http://www.google.com.hk/images/srpr/logo4w.png",
	 "http://www.baidu.com/img/bdlogo.gif",
	 NULL
	};
	char szDir[MAX_PATH];
	GetCurrentDirectory(MAX_PATH,szDir);
	string filepath(szDir);
	if(filepath.at(filepath.length()-1)!='\\')
	 filepath.append("\\");
	for(char** file=(char**)downfiles;*file!=NULL;++file)
	{
	 string savepath=filepath;
	 string f(*file);
	 int i=f.find_last_of('/',f.length());
	 if(i!=savepath.length()-1)
	 savepath.append(f.substr(i+1,f.length()-i));
	 DownloadFile(*file,savepath.c_str());
	}
	return 0;
	}

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