vc 下载http 图片

//下载
#include    <wininet.h> 
#pragma   comment(lib, "wininet.lib ")

void   Down(CString   Url,CString   Path)
{
HINTERNET   hSession=InternetOpen(NULL,INTERNET_OPEN_TYPE_PRECONFIG,NULL,NULL,0);
HINTERNET   hConnection=InternetOpenUrl(hSession,Url,NULL,0,0,0);
if(hConnection   ==   NULL)return   FALSE;//返回
BYTE   Buffer[4096];
DWORD   Read=0,i;
HANDLE   hFile=CreateFile(Path,GENERIC_WRITE,0,NULL,CREATE_ALWAYS,0,NULL);
InternetReadFile(hConnection,Buffer,sizeof(Buffer),&Read);
while(Read!=0)
{
WriteFile(hFile,Buffer,Read,&i,NULL);
InternetReadFile(hConnection,Buffer,sizeof(Buffer),&Read);
}
CloseHandle(hFile);

InternetCloseHandle(hConnection);
InternetCloseHandle(hSession);
return   TRUE;

}

上传

UploadFile(LPCTSTR strURL, //负责接收上传操作的页面的URL
LPCTSTR strLocalFileName)  //待上传的本地文件路径
{
 ASSERT(strURL != NULL && strLocalFileName != NULL);

 BOOL bResult = FALSE;
 DWORD dwType = 0;
 CString strServer;
 CString strObject;
 INTERNET_PORT wPort = 0;
 DWORD dwFileLength = 0;
 char * pFileBuff = NULL;

 CHttpConnection * pHC = NULL;
 CHttpFile * pHF = NULL;
 CInternetSession cis;

 bResult =  AfxParseURL(strURL, dwType, strServer, strObject, wPort);
 if(!bResult)
  return FALSE;
 CFile file;
 try
 {
  if(!file.Open(strLocalFileName, CFile::shareDenyNone | CFile::modeRead))
   return FALSE;
  dwFileLength = file.GetLength();
  if(dwFileLength <= 0)
   return FALSE;
  pFileBuff = new char[dwFileLength];
  memset(pFileBuff, 0, sizeof(char) * dwFileLength);
  file.Read(pFileBuff, dwFileLength);

  const int nTimeOut = 5000;
  cis.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, nTimeOut); //联接超时设置
  cis.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1);  //重试1次
  pHC = cis.GetHttpConnection(strServer, wPort);  //取得一个Http联接

  pHF = pHC->OpenRequest(CHttpConnection::HTTP_VERB_POST, strObject);
  if(!pHF->SendRequest(NULL, 0, pFileBuff, dwFileLength))
  {
   delete[]pFileBuff;
   pFileBuff = NULL;
   pHF->Close();
   pHC->Close();
   cis.Close();
   return FALSE;
  }
  DWORD dwStateCode = 0;
  pHF->QueryInfoStatusCode(dwStateCode);

  if(dwStateCode == HTTP_STATUS_OK)
   bResult = TRUE;
 }

 catch(CInternetException * pEx)
 {
  char sz[256] = "";
  pEx->GetErrorMessage(sz, 25);
  CString str;
  str.Format("InternetException occur!\r\n%s", sz);
  AfxMessageBox(str);
 }
 catch(CFileException& fe)
 {
  CString str;
  str.Format("FileException occur!\r\n%d", fe.m_lOsError);
  AfxMessageBox(str);
 }
 catch(...)
 {
  DWORD dwError = GetLastError();
  CString str;
  str.Format("Unknow Exception occur!\r\n%d", dwError);
  AfxMessageBox(str);
 }

 delete[]pFileBuff;
 pFileBuff = NULL;
 file.Close();
 pHF->Close();
 pHC->Close();
 cis.Close();
 return bResult;
}

下载

bool Download(const CString& strFileURLInServer, //待下载文件的URL
const CString & strFileLocalFullPath)//存放到本地的路径
{
ASSERT(strFileURLInServer != "");
ASSERT(strFileLocalFullPath != "");
CInternetSession session;
CHttpConnection* pHttpConnection = NULL;
CHttpFile* pHttpFile = NULL;
CString strServer, strObject;
INTERNET_PORT wPort;
bool bReturn = false;

DWORD dwType;
const int nTimeOut = 2000;
session.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, nTimeOut); //重试之间的等待延时
session.SetOption(INTERNET_OPTION_CONNECT_RETRIES, 1); //重试次数
char* pszBuffer = NULL;

try
{
AfxParseURL(strFileURLInServer, dwType, strServer, strObject, wPort);
pHttpConnection = session.GetHttpConnection(strServer, wPort);
pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_GET, strObject);
if(pHttpFile->SendRequest() == FALSE)
return false;
DWORD dwStateCode;

pHttpFile->QueryInfoStatusCode(dwStateCode);
if(dwStateCode == HTTP_STATUS_OK)
{
HANDLE hFile = CreateFile(strFileLocalFullPath, GENERIC_WRITE,
FILE_SHARE_WRITE, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL,
NULL); //创建本地文件
if(hFile == INVALID_HANDLE_VALUE)
{
pHttpFile->Close();
pHttpConnection->Close();
session.Close();
return false;
}

char szInfoBuffer[1000]; //返回消息
DWORD dwFileSize = 0; //文件长度
DWORD dwInfoBufferSize = sizeof(szInfoBuffer);
BOOL bResult = FALSE;
bResult = pHttpFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH,
(void*)szInfoBuffer,&dwInfoBufferSize,NULL);

dwFileSize = atoi(szInfoBuffer);
const int BUFFER_LENGTH = 1024 * 10;
pszBuffer = new char[BUFFER_LENGTH]; //读取文件的缓冲
DWORD dwWrite, dwTotalWrite;
dwWrite = dwTotalWrite = 0;
UINT nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH); //读取服务器上数据

while(nRead > 0)
{
WriteFile(hFile, pszBuffer, nRead, &dwWrite, NULL); //写到本地文件
dwTotalWrite += dwWrite;
nRead = pHttpFile->Read(pszBuffer, BUFFER_LENGTH);
}

delete[]pszBuffer;
pszBuffer = NULL;
CloseHandle(hFile);
bReturn = true;
}
}
catch(CInternetException* e)
{
TCHAR tszErrString[256];
e->GetErrorMessage(tszErrString, ArraySize(tszErrString));
TRACE(_T("Download XSL error! URL: %s,Error: %s"), strFileURLInServer, tszErrString);
e->Delete();
}
catch(...)
{
}

if(pszBuffer != NULL)
{
delete[]pszBuffer;
}
if(pHttpFile != NULL)
{
pHttpFile->Close();
delete pHttpFile;
}
if(pHttpConnection != NULL)
{
pHttpConnection->Close();
delete pHttpConnection;
}
session.Close();
return bReturn;
}