如何用VC++中创建一个URL链接，并通过此链接向服务器发送信息，再取得返回信息？谢谢

[bbjj]

[ILMLCZH]

to:heilong()
thanks!
[e-mail]

[bbjj]

我的mail:
[e-mail]
谢谢

[killingfield]

也给我一份吧，先谢了！
[e-mail]

[bbjj]

java下已经实现了，vc++下如何通过URL向服务器post数据，并取得返回信息

[bbjj]

建立URL连接后，POST串如：id=1&name=2&pw=3,然后取得从服务器返回的信息

[BABIZHU]

很简单啊，用winet就ok了，我做过一个通过不断提交form数据，破戒邮件密码的程序

[bbjj]

能详细讲讲吗？或mailto: [e-mail] 谢谢

[unix123]

CInternetSession可以实现，挺好用的

CInternetSession session;
CInternetFile * file = NULL;

try{
file = (CInternetFile *)session.OpenURL (mReqStr,1, INTERNET_FLAG_TRANSFER_ASCII | INTERNET_FLAG_RELOAD);
}
catch(CInternetException * pEx){
file = NULL;
pEx->Delete ();
}
if (file){
for (int i=0;i<30 && file->ReadString(line);i++)
Rstmp = Rstmp + line; file->Close();
delete file;
}
else{ }

[bbjj]

up一下

[heilong]

用http协议吗？我这有用http协议访问网页的源程序，

[Novelty]

找本<<Visual C++网络高级编程>>看看就知道啦.

记住是机械出版社的.

[bbjj]

如何把串id=1&name=2&pw=3 发送到URL

[heilong]

还是贴出来吧，一个一个发可发不过来，函数如下，调用方法嘛，
例：HttpSend("www.csdn.net","test.asp?","id=233&name=heilong",TRUE);
最後一个参数IsAuto是我程序重要用到的，对大家来说没什么大用，大家可以去掉，主要是看看用mfc的Wininet类建立一个internet程序的步骤，这些msdn中都有，不过写这个函数可花了我一天的时间，没办法，偶以前没做过，现在共享以下，欢迎大家指教，我的email是[e-mail]
/////////////////////////////////以下为函数源码
BOOL CDicosDlg::HttpSend(CString strSever, CString Object,CString strValue,BOOL bIsAuto)
{
//CString temp = Object + strValue;
//temp = strSever + temp;
//MessageBox(temp);
CWnd* butTran = GetDlgItem (IDC_BUTTON_TRANSCOM);
if (bIsAuto)//说明正在Ontimer中直接调用该函数，应该屏蔽掉其他的发送
{
butTran->EnableWindow (FALSE);
bIsTranscom = TRUE;
}
CHttpConnection* m_Connection = NULL;
CHttpFile* m_File = NULL;
CString m_Ret;//用来接收返回信息
CInternetSession m_Session(AfxGetAppName (),0,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
TRY
{
//DWORD dwValue = 0;
//m_Session.QueryOption (INTERNET_OPTION_CONNECT_RETRIES,dwValue);
m_Session.SetOption (INTERNET_OPTION_CONNECT_RETRIES,1);
m_Session.SetOption (INTERNET_OPTION_CONNECT_TIMEOUT,20000);
m_Session.SetOption (INTERNET_OPTION_RECEIVE_TIMEOUT,20000);
INTERNET_PORT nPort = 80;
CString strServer = strSever;
m_Connection = m_Session.GetHttpConnection(strServer,nPort,NULL,NULL );
if (m_Connection == NULL)
{
DisplayStat ("An error occurred connecting to the server");
Sleep (2000);
goto end;
}
LPCTSTR ppszAcceptTypes[2];
ppszAcceptTypes[0] = _T("*/*");
ppszAcceptTypes[1] = NULL;
CString strObject = Object;
strObject = Object + strValue;
m_File = m_Connection->OpenRequest(NULL, strObject, NULL,1,ppszAcceptTypes, NULL, INTERNET_FLAG_RELOAD |
INTERNET_FLAG_DONT_CACHE);
if (m_File == NULL)
{
DisplayStat ("打开服务器上的文件出错");
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf("打开服务器上的文件出错");
strInf = Object + strInf + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
goto end;
}
if (!m_File->SendRequest (NULL,0,NULL,0))
{
DisplayStat ("An error occurred connecting to the server");
Sleep (2000);
goto end;
}
TCHAR szStatusCode[32];
DWORD dwInfoSize = 32;
if (m_File->QueryInfo (HTTP_QUERY_STATUS_CODE,szStatusCode,&dwInfoSize))
{
long nStatusCode = _ttol(szStatusCode);

//Handle any authentication errors
if (nStatusCode == HTTP_STATUS_REQUEST_TIMEOUT)
{
DisplayStat ("连接超时,请重试");
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf ("连接超时,请重试");
strInf = Object + strInf + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
goto end;
// We have to read all outstanding data on the Internet handle
// before we can resubmit request. Just discard the data.
}
else if (nStatusCode != HTTP_STATUS_OK)
{
DisplayStat("服务器端错误");
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf("服务器端错误");
strInf = Object + strInf + szStatusCode + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
goto end;
}
//状态正确，开始读取信息
}
else
{
DisplayStat("无法取得服务器返回信息");
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf("无法取得服务器返回信息");
strInf = Object + strInf + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
goto end;
}
char szReadBuf[1024];
DWORD dwBytesToRead = 1024;
DWORD m_ActualSize = 0;
do
{
ZeroMemory (szReadBuf,1024);
DWORD m_ActualSize = m_File->Read (szReadBuf,dwBytesToRead);
m_Ret = m_Ret + szReadBuf;
}while(!(m_ActualSize < dwBytesToRead));
TRACE("%s",m_Ret);
int iFirst = m_Ret.Find ("<返回值>",0);
CString strTemp = m_Ret.Right (m_Ret.GetLength () - iFirst - 8);
int iLast = strTemp.Find ("</返回值>",0);
strTemp = strTemp.Left (iLast);
if (strTemp == "操作成功")
{
DisplayStat("数据上传成功");
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf ("数据上传成功");
strInf = Object + strInf + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
if (m_File)
{
m_File->Close ();
delete m_File;
}
if (m_Connection)
{
m_Connection->Close ();
delete m_Connection;
}
m_Session.Close ();
if (bIsAuto)
{
butTran->EnableWindow ();
bIsTranscom = FALSE;
}
DisplayStat ("空闲。。。");
return TRUE;
}
else
{
DisplayStat("数据上传失败，请稍候重试");
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf ("数据上传失败，请稍候重试");
strInf = Object + strInf + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
goto end;
}
//int i = m_Content.Replace ("\r\n","\n");
}
CATCH (CInternetException, e)
{
char errStr[100];
e->GetErrorMessage (errStr,100);
DisplayStat (errStr);
/*CStdioFile debugFile;
debugFile.Open ("debug.txt",CFile::modeWrite|CFile::modeCreate|CFile::modeNoTruncate|CFile::shareDenyWrite|CFile::typeText);
debugFile.SeekToEnd ();
CString strInf("InternetException");
strInf = strInf + errStr + "\n";
debugFile.Write (strInf.GetBuffer (strInf.GetLength ()),strInf.GetLength ());
strInf.ReleaseBuffer ();*/
if (m_File)
{
m_File->Close ();
delete m_File;
m_File = NULL;
}
if (m_Connection)
{
m_Connection->Close ();
delete m_Connection;
m_Connection = NULL;
}
m_Session.Close ();
if (bIsAuto)
{
butTran->EnableWindow ();
bIsTranscom = FALSE;
}
DisplayStat ("空闲。。。");
return FALSE;
//return FALSE;
}
//CATCH_ALL (e)
//{
//}
END_CATCH
end:
if (m_File)
{
m_File->Close ();
delete m_File;
m_File = NULL;
}
if (m_Connection)
{
m_Connection->Close ();
delete m_Connection;
m_Connection = NULL;
}
m_Session.Close ();
if (bIsAuto)
{
butTran->EnableWindow ();
bIsTranscom = FALSE;
}
DisplayStat ("空闲。。。");
return FALSE;
}

[bbjj]

如何对参数进行URL编码，得到行例如id=1&name=2&pw=3%2b 的格式

[heilong]

你说的那种编码，是针对非字符的，即如果你要上传的name是汉字，则字串应该是%第一个字节的ascii码%第二个字节的ascii码.....，你只要取得你的非字符的字串每个字节的ascii码，前面加上%即可

[bbjj]

就象用“+”代替参数中的空格，用“%2b”代替参数中的“+”，类似于java中的URLENcoder.encode(strName);

[bbjj]

给分了