WIN32 API - http编程

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1. 一般的步骤是，首先通过InternetOpen()函数创建位于根部的HINTERNET句柄，然后才能进一步建立HTTP、FTP会话，使用InternetConnect()函数创建一个指定的会话，初始化HTTP、FTP会话（根据指定的参数决定），并创建一个根句柄的分支，HttpOpenRequest()、FtpOpenFile()、FtpFindFirstFile()等函数将使用InternetConnect()所创建的句柄，建立到指定站点的连接。例子代码如下：

bool testHttpDownload()

{

// 建立会话

HINTERNET hInternet;

hInternet = InternetOpen("", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);

if(hInternet == NULL) return false;

// 建立连接

HINTERNET hConnect;

hConnect = InternetConnect(hInternet, "hi.baidu.com", INTERNET_INVALID_PORT_NUMBER,

"", "", INTERNET_SERVICE_HTTP, INTERNET_FLAG_PASSIVE, 0);

if( hInternet == NULL )

{

InternetCloseHandle(hInternet);

return false;

}

HINTERNET httpFile;

httpFile = HttpOpenRequest(hConnect, "GET", "vc_net/blog/item/2d830208fe388bc063d986b2.html", HTTP_VERSION, NULL, 0, INTERNET_FLAG_NO_UI | INTERNET_FLAG_DONT_CACHE, 1);

if(httpFile == NULL)

{

InternetCloseHandle(hConnect);

InternetCloseHandle(hInternet);

return false;

}

HttpSendRequest(httpFile, NULL, NULL, 0, 0);

char buf[1024];

DWORD buf_len = 1024;

DWORD buf_read = 1024;

FILE *fp = fopen("e:\\test.txt", "wb");

while(1)

{

InternetReadFile(httpFile, buf, buf_len, &buf_read);

if(buf_read == 0) break;

fwrite(buf, 1, buf_read, fp);

}

fclose(fp);

InternetCloseHandle(httpFile);

InternetCloseHandle(hConnect);

InternetCloseHandle(hInternet);

return true;

}

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