MFC用http类下载文件

Love The Way You Lie 2023-10-18 08:15 98阅读 0赞

CString url=\_T("[http://192.168.0.88:8089/a.jpg][http_192.168.0.88_8089_a.jpg]");  
CString dol=\_T("C:/a.jpg");  
commun->Down(url,dol);

bool CCOMMUN::Down(const CString& strFileURLInServer, //待下载文件的URL  
const CString & strFileLocalFullPath)//存放到本地的路径  
\{  
\#define ArraySize(A) RTL\_NUMBER\_OF\_V2(A)

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;  
\}

[http_192.168.0.88_8089_a.jpg]: http://192.168.0.88:8089/a.jpg