WinINet function(1)

一.Url相关函数

1.InternetCreateUrl

Cracks a URL into its component parts.

#define URL_STRING_TEST    "http://www.cnblogs.com/Clingingboy/archive/2011/11/20/2256200.html"
void main()
{   
    TCHAR szHostName[128];
    TCHAR szUrlPath[256];
    URL_COMPONENTS crackedURL;
    ZeroMemory(&crackedURL, sizeof (URL_COMPONENTS));
    crackedURL.dwStructSize     = sizeof (URL_COMPONENTS);
    crackedURL.lpszHostName     = szHostName;
    crackedURL.dwHostNameLength = sizeof(szHostName);
    crackedURL.lpszUrlPath      = szUrlPath;
    crackedURL.dwUrlPathLength  = sizeof(szUrlPath);
    InternetCrackUrl(URL_STRING_TEST,(DWORD)strlen(URL_STRING_TEST),0,&crackedURL);
}

2.InternetCreateUrl

Creates a URL from its component parts.

DWORD urlLength;
InternetCreateUrl(&crackedURL,ICU_ESCAPE,szUrlPath,&urlLength);

3.InternetCanonicalizeUrl

Canonicalizes a URL, which includes converting unsafe characters and spaces into escape sequences.

InternetCanonicalizeUrl("http://www.xxx.com/viewthread.php?action=printable&tid=99     ",szUrlPath,&urlLength,ICU_ENCODE_SPACES_ONLY);

4.InternetCombineUrl

Combines a base and relative URL into a single URL.

InternetCombineUrl("http://www.xxx.com/","2256200.html",szUrlPath,&urlLength,ICU_BROWSER_MODE);

二.Internet基本应用相关函数

1.InternetOpen

Initializes an application's use of the WinINet functions.

2.InternetOpenUrl

Opens a resource specified by a complete FTP, Gopher, or HTTP URL.

3.InternetReadFile

Reads data from a handle opened by the InternetOpenUrl, FtpOpenFile, GopherOpenFile, or HttpOpenRequest function

4.InternetCloseHandle

Closes a single Internet handle.

应用1:打开因特网上指定的文件

void Download()
{

    DWORD byteread=0;
    char buffer[100];
    memset(buffer,0,100);
    HINTERNET internetopen;


    internetopen=InternetOpen("Testing",INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
    if (internetopen==NULL)
    { 
        cout<<"Internet open failed!"<<endl;
        return;
    }
    HINTERNET internetopenurl;
    internetopenurl=InternetOpenUrl(internetopen,"http://www.cnblogs.com/Clingingboy/archive/2011/11/20/2256200.html",NULL,0,INTERNET_FLAG_RELOAD,0);  
    if (internetopenurl==NULL)
    { 
        cout<<"Internet open url failed!"<<endl; 
        goto there;
    }

    BOOL hwrite;
    DWORD written;
    HANDLE createfile;
    createfile=CreateFile("C://a.html",GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0);
    if (createfile==INVALID_HANDLE_VALUE)
    {  
        cout<<"Create File failed!"<<endl;
        goto next;
    }

    BOOL internetreadfile;
    while(1)
    {
        internetreadfile=InternetReadFile(internetopenurl,buffer,sizeof(buffer),&byteread);
        if(byteread==0)  
            break;
        hwrite=WriteFile(createfile,buffer,sizeof(buffer),&written,NULL);
        if (hwrite==0)
        {
            cout<<"Write to file failed!"<<endl;
            goto here;
        }
    }

    cout<<"Finished downloading!"<<endl;

here:
    CloseHandle(createfile);
next: 
    InternetCloseHandle(internetopenurl);
there:
    InternetCloseHandle(internetopen);

}

三.连接检查函数

1.InternetCheckConnection

Allows an application to check if a connection to the Internet can be established.

BOOL result=InternetCheckConnection(URL_STRING_TEST,FLAG_ICC_FORCE_CONNECTION,0);

2.InternetAttemptConnect

Attempts to make a connection to the Internet.

BOOL result=InternetAttemptConnect(0);