MFC学习笔记10 HTTP请求

http get

代码示例

#include <afxinet.h>

//通过 http GET 协议来获取并保存文件
CInternetSession session;
session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, 1000 * 20);
session.SetOption(INTERNET_OPTION_CONNECT_BACKOFF, 1000);
session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1);

CHttpConnection* pConnection = session.GetHttpConnection(TEXT("localhost"),(INTERNET_PORT)8080);
CHttpFile* pFile = pConnection->OpenRequest( CHttpConnection::HTTP_VERB_GET,
                                             TEXT("/Practice/index.jsp"));

CString szHeaders = L"Accept: audio/x-aiff, audio/basic, audio/midi,\
                     audio/mpeg, audio/wav, image/jpeg, image/gif, image/jpg, image/png,\
                     image/mng, image/bmp, text/plain, text/html, text/htm\r\n";

pFile->AddRequestHeaders(szHeaders);

pFile->SendRequest();

DWORD dwRet;
pFile->QueryInfoStatusCode(dwRet);

if(dwRet != HTTP_STATUS_OK)
{
    CString errText;
    errText.Format(L"POST出错，错误码：%d", dwRet);
    AfxMessageBox(errText);
}
else
{
    int len = pFile->GetLength();
    char buf[2000];
    int numread;
    CString filepath;
    CString strFile = L"response.txt";
    filepath.Format(L".\\%s", strFile);
    CFile myfile( filepath,
                  CFile::modeCreate|CFile::modeWrite|CFile::typeBinary);
    while ((numread = pFile->Read(buf,sizeof(buf)-1)) > 0)
    {
        buf[numread] = '\0';
        strFile += buf;
        myfile.Write(buf, numread);
    }
    myfile.Close();
}

session.Close();
pFile->Close(); 
delete pFile;

HTTP 状态码

常用状态码

http post

CInternetSession session;
session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, 1000 * 20);
session.SetOption(INTERNET_OPTION_CONNECT_BACKOFF, 1000);
session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1);

CHttpConnection* pConnection = session.GetHttpConnection( TEXT("localhost"),
                                                          (INTERNET_PORT)8080);
CHttpFile* pFile = pConnection->OpenRequest( CHttpConnection::HTTP_VERB_POST,
                                             TEXT("/Practice/RequestObjectInJSP.jsp"),
                                             NULL,
                                             1,
                                             NULL,
                                             TEXT("HTTP/1.1"),
                                             INTERNET_FLAG_RELOAD);

//需要提交的数据
CString szHeaders   = L"Content-Type: application/x-www-form-urlencoded;";

//下面这段编码，则是可以让服务器正常处理
CHAR* strFormData = "username=WaterLin&password=TestPost";
pFile->SendRequest( szHeaders,
                    szHeaders.GetLength(),
                    (LPVOID)strFormData,
                    strlen(strFormData));

DWORD dwRet;
pFile->QueryInfoStatusCode(dwRet);

if(dwRet != HTTP_STATUS_OK)
{
    CString errText;
    errText.Format(L"POST出错，错误码：%d", dwRet);
    AfxMessageBox(errText);
}
else
{
    int len = pFile->GetLength();
    char buf[2000];
    int numread;
    CString filepath;
    CString strFile = L"result.html";
    filepath.Format(L".\\%s", strFile);
    CFile myfile(filepath,
        CFile::modeCreate|CFile::modeWrite|CFile::typeBinary);
    while ((numread = pFile->Read(buf,sizeof(buf)-1)) > 0)
    {
        buf[numread] = '\0';
        strFile += buf;
        myfile.Write(buf, numread);
    }
    myfile.Close();
}

session.Close();
pFile->Close(); 
delete pFile;

字符编码设置

CString szHeaders   = L"Content-Type: application/x-www-form-urlencoded;charset=UTF-8";

参考：
​​​http://cn.waterlin.org/Microsoft/MFC-HTTP-request.html​​