從HTTP服務器上下載一個文件有很多方法，“熱心”的微軟提供了 WinInet 類，用起來也很方便。當然，我們也可以自己實現這些功能，通過格式化請求頭很容易就能實現斷點續傳和檢查更新等等功能 。
1. 連接主機
2. 格式化請求頭
3. 設置接收,發送超時
要想從服務器下載文件，首先要向服務器發送一個請求。HTTP 請求頭由若干行字符串組成。下面結合實例說說 HTTP 請求頭的格式。假設要下載
http://www.sina.com.cn/index.html 這個網頁 ，那么請求頭的寫法如下：
第1行：方法，請求的內容，HTTP協議的版本
下載一般可以用GET方法，請求的內容是“/index.html”，HTTP協議的版本是指瀏覽器支持的版本，對于下載軟件來說無所謂，所以用1.1版 “HTTP/1.1”；
“GET /index.html HTTP/1.1”
第2行：主機名，格式為“Host:主機”
在這個例子中是：“Host:www.sina.com.cn”
第3行：接受的數據類型，下載軟件當然要接收所有的數據類型，所以：
“Accept:*/*”
第4行：指定瀏覽器的類型
有些服務器會根據客戶服務器種類的不同會增加或減少一些內容，在這個例子中可以這樣寫：
“User-Agent:Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)”
第5行：連接設置
設定為一直保持連接：“Connection:Keep-Alive”
第6行：若要實現斷點續傳則要指定從什么位置起接收數據，格式如下：
“Range: bytes=起始位置 - 終止位置”
比如要讀前500個字節可以這樣寫：“Range: bytes=0 - 499”；從第 1000 個字節起開始下載：
“Range: bytes=999 -”
最后，別忘了加上一行空行，表示請求頭結束。整個請求頭如下：
GET /index.html HTTP/1.1
Host:www.sina.com.cn
Accept:*/*
User-Agent:Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)
Connection:Keep-Alive
下面用例子看看如何進行斷點的下載吧
//?DownloadFile.h:?interface?for?the?CDownloadFile?class.
//
/**///////////////////////////////////////////////////////////////////////
#if?!defined(AFX_DOWNLOADFILE_H__E9A59779_BEF9_4A78_8D0E_ED8C9498E07C__INCLUDED_)
#define?AFX_DOWNLOADFILE_H__E9A59779_BEF9_4A78_8D0E_ED8C9498E07C__INCLUDED_
#if?_MSC_VER?>?1000
#pragma?once
#endif?//?_MSC_VER?>?1000
#define?NOTIFY_MSG_WPARAM_GENDOWNFILEID?0x01
#define?NOTIFY_MSG_LOW_WPARAM_FULLSIZE?0x10
#define?NOTIFY_MSG_LOW_WPARAM_CURRENTSIZE?0x20
#define?NOTIFY_MSG_LOW_WPARAM_DOWNSIZE?0x30
#define?NOTIFY_MSG_LOW_WPARAM_DOWNSPEED?0x40
class?CDownloadFile?
{
public:
BOOL?OpenRedirectHttpURL(CString?&strOldLocation,CInternetSession?&cSession);
BOOL?DownLoadFile(LPCTSTR?lpFileURL,LPCTSTR?lpSaveFile);
CDownloadFile();
virtual?~CDownloadFile();
LPCTSTR?GetSavedFileName()?{?return?m_strSaveToFile;}
LPCTSTR?GetDownURL()?{?return?m_strFileURL;}
public:
WORD?GenFileID();
void?RegisterNotifyWindow(DWORD?dwThreadID,HWND?hWnd,DWORD?dwMsg);
BOOL?GetUNCFile();
bool?m_bForceReload;
DWORD?m_TimeOut;
WORD?m_wFileID;
protected:
DWORD?m_dwThreadID;
void?PostNotifyMessage(WPARAM?wParam,?LPARAM?lParam);
DWORD?m_dwMsgID;
HWND?m_hNotify;
BOOL?GetFtpFile(CInternetSession?&cSession);
BOOL?GetHttpFile(CInternetSession?&cSession);
CString?m_strTmpFileName;
CString?m_strFileURL;
CString?m_strSaveToFile;
CString?m_rawHeaders;
float?m_transferRate;
DWORD?m_infoStatusCode;
};
#endif?//?!defined(AFX_DOWNLOADFILE_H__E9A59779_BEF9_4A78_8D0E_ED8C9498E07C__INCLUDED_)
//?DownloadFile.cpp:?implementation?of?the?CDownloadFile?class.
//
/**///////////////////////////////////////////////////////////////////////
#include?"stdafx.h"
#include?"DownloadFile.h"
#pragma?comment(?lib,"Wininet.lib"?)
#include?"shlwapi.h"
#pragma?comment(?lib,"shlwapi.lib"?)
#ifdef?_DEBUG
#undef?THIS_FILE
static?char?THIS_FILE[]=__FILE__;
#define?new?DEBUG_NEW
#endif
#define?BUFFER_SIZE?4095
const?TCHAR?szHeaders[]?=?_T("Accept:?*/*\r\nUser-Agent:?Mozilla/4.0?(compatible;?MSIE?5.00;?Windows?98)\r\n");
/**/////////////////////////////////////////////////////////////////////////?Construction/Destruction
/**///////////////////////////////////////////////////////////////////////
CDownloadFile::CDownloadFile()
{
m_TimeOut?=?0;
m_bForceReload?=?true;
m_dwThreadID?=?0;
m_hNotify?=?NULL;
m_dwMsgID?=?0;
m_wFileID?=?0;
}
CDownloadFile::~CDownloadFile()
{
}
BOOL?CDownloadFile::DownLoadFile(LPCTSTR?lpFileURL,?LPCTSTR?lpSaveFile)
{
BOOL?bRet?=?FALSE;
if?(?!::PathIsURL(lpFileURL)?)
{
return?bRet;
}
m_strSaveToFile?=?lpSaveFile;
m_strFileURL?=?lpFileURL;
m_strTmpFileName?=?lpSaveFile;
m_strTmpFileName?+=?_T(".df!");
CString?strServer,strObject;INTERNET_PORT?nPort;
CString?strAgentCaption?=?_T("Update?Download?")?;
strAgentCaption?+=?::PathFindFileName(lpSaveFile);
DWORD?dwFlags?=?0;
InternetGetConnectedState(&dwFlags,?0);
CInternetSession?session?(strAgentCaption,?1,
(dwFlags?&?INTERNET_CONNECTION_PROXY)?==?INTERNET_CONNECTION_PROXY???INTERNET_OPEN_TYPE_PRECONFIG?:?INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY,
NULL,?NULL,?0);
AfxParseURL(m_strFileURL,dwFlags,strServer,strObject,nPort);
if?(m_TimeOut?!=?0)
session.SetOption(INTERNET_OPTION_DATA_RECEIVE_TIMEOUT,?m_TimeOut);
if(?!m_wFileID?)
m_wFileID?=?GenFileID();
PostNotifyMessage(NOTIFY_MSG_WPARAM_GENDOWNFILEID,m_wFileID);
try
{
if?(?dwFlags==?AFX_INET_SERVICE_HTTP?)
{
bRet?=?GetHttpFile(session);
}
else?if(?dwFlags==?AFX_INET_SERVICE_FTP?)
{
bRet?=?GetFtpFile(session);
}
else?if(?dwFlags==?AFX_INET_SERVICE_FILE?)
{
if(?UrlIsFileUrl(m_strFileURL)?)
bRet?=?GetUNCFile();
}
else
{
;
}?
}
catch?(CException*?pEx)
{
TCHAR?szErrorMsg[MAX_PATH]?=?{0};
pEx->GetErrorMessage(szErrorMsg,?MAX_PATH);
TRACE(?_T("Exception:?%s\n")?,?szErrorMsg);
pEx->Delete();
}
session.Close();
m_wFileID?=?0;
if?(bRet)
{
if?(!::MoveFileEx(m_strTmpFileName,m_strSaveToFile,MOVEFILE_REPLACE_EXISTING)?)
{
Sleep(1000);
::MoveFileEx(m_strTmpFileName,m_strSaveToFile,MOVEFILE_REPLACE_EXISTING);
}
}
return?bRet;
}
BOOL?CDownloadFile::GetHttpFile(CInternetSession?&cSession)
{
BOOL?bRet?=?FALSE;
CFile?m_TmpFile;
CFileException?fileException;
if?(?!m_TmpFile.Open?(m_strTmpFileName,?
CFile::modeCreate?|?CFile::modeNoTruncate?|?CFile::modeReadWrite
|?CFile::shareDenyWrite?|?CFile::typeBinary,
&fileException?)?)
{
TRACE(?_T("Open?File?failed:?%d\n"),?fileException.m_cause?);
return?bRet;
}
CString?strRangeQuest;
if?(m_TmpFile.GetLength()>0)
{
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_CURRENTSIZE,m_wFileID),m_TmpFile.GetLength());
m_TmpFile.SeekToEnd();
strRangeQuest.Format(?_T("%sRange:?bytes=%d-\r\n"),?szHeaders,m_TmpFile.GetLength());
}
else
strRangeQuest?=?szHeaders;
DWORD?dwCount?=?0;
CHttpFile*?pFile?=?NULL;
CString?strTmpURL?=?m_strFileURL;
try
{
DWORD?dwFlags?=?INTERNET_FLAG_TRANSFER_BINARY?
|INTERNET_FLAG_DONT_CACHE
|INTERNET_FLAG_PRAGMA_NOCACHE
;
if?(m_bForceReload)?{
dwFlags?|=?INTERNET_FLAG_RELOAD;
}
//Here?Find?URLFile?Redirect.
//?OpenRedirectHttpURL(strTmpURL,cSession);
pFile?=?(CHttpFile*)?cSession.OpenURL(strTmpURL,?1,?dwFlags,strRangeQuest,?-1);
}
catch?(CInternetException*?e)
{
TCHAR?szCause[MAX_PATH]?=?{0};
e->GetErrorMessage(szCause,?MAX_PATH);
e->Delete();
delete?pFile;
pFile?=?NULL;
return?bRet;
}
COleDateTime?startTime?=?COleDateTime::GetCurrentTime();
DWORD?dwHttpFileSize?=?0;
if?(pFile)
{
BYTE?buffer[BUFFER_SIZE+1]?=?{0};
try?{
UINT?nRead?=?0;
pFile->QueryInfo(HTTP_QUERY_CONTENT_LENGTH?|?HTTP_QUERY_FLAG_NUMBER,dwHttpFileSize);
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_FULLSIZE,m_wFileID),dwHttpFileSize);
TRACE(?_T("Totoal?Length?is?%d\n"),?dwHttpFileSize?);
dwCount?=?0;
do
{
nRead?=?pFile->Read(buffer,?BUFFER_SIZE);
if?(nRead?>?0)
{
buffer[nRead]?=?0;
m_TmpFile.Write(buffer,nRead);
COleDateTimeSpan?elapsed?=?COleDateTime::GetCurrentTime()?-?startTime;
double?dSecs?=?elapsed.GetTotalSeconds();
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_DOWNSIZE,m_wFileID),dwCount);
if?(dSecs?>?0.0)
{
dwCount?+=?nRead;
m_transferRate?=?(float)?(?dwCount?/?1024.0?/?dSecs?);
TRACE("Read?%d?bytes?(%0.1f?Kb/s)\n",?dwCount,?m_transferRate?);
}
else
{
TRACE("Read?%d?bytes\n",?dwCount);
m_transferRate?=?(float)?(?dwCount?/?1024.0?);
}
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_DOWNSPEED,m_wFileID),(LPARAM)m_transferRate);
}
}
while?(nRead?>?0);
bRet?=?TRUE;
}
catch?(CFileException?*e)
{
TCHAR?szCause[MAX_PATH]?=?{0};
e->GetErrorMessage(szCause,?MAX_PATH);
TRACE("ErrorMsg?:?%s\n",?szCause);
e->Delete();
delete?pFile;
m_TmpFile.Close();
return?FALSE;
}
pFile->QueryInfoStatusCode(m_infoStatusCode);?
pFile->QueryInfo(HTTP_QUERY_RAW_HEADERS?,m_rawHeaders);
pFile->Close();
m_TmpFile.Close();
delete?pFile;
}
return?bRet;
}
BOOL?CDownloadFile::OpenRedirectHttpURL(CString?&strOldLocation,CInternetSession?&cSession)
{
BOOL?bRet?=?FALSE;
CHttpFile?*pFile?=?NULL;
CHttpConnection*?pServer?=?NULL;
CString?strServerName,strObject;
INTERNET_PORT?nPort?=?0;
DWORD?dwServiceType?=?0;
if?(!AfxParseURL(strOldLocation,?dwServiceType,?strServerName,?strObject,?nPort)?||
dwServiceType?!=?INTERNET_SERVICE_HTTP)
{
TRACE(?_T("Not?A?Http?Quest!\n")?);
return?bRet;
}
pServer?=?cSession.GetHttpConnection(strServerName,?nPort);
pFile?=?pServer->OpenRequest(CHttpConnection::HTTP_VERB_GET,
strObject,?NULL,?1,?NULL,?NULL,?
INTERNET_FLAG_EXISTING_CONNECT?|?INTERNET_FLAG_NO_AUTO_REDIRECT);
pFile->AddRequestHeaders(szHeaders);
pFile->SendRequest();
DWORD?dwRet;
pFile->QueryInfoStatusCode(dwRet);
//?if?access?was?denied,?prompt?the?user?for?the?password
if?(dwRet?==?HTTP_STATUS_DENIED)
{
DWORD?dwPrompt;
dwPrompt?=?pFile->ErrorDlg(NULL,?ERROR_INTERNET_INCORRECT_PASSWORD,
FLAGS_ERROR_UI_FLAGS_GENERATE_DATA?|?FLAGS_ERROR_UI_FLAGS_CHANGE_OPTIONS,?NULL);
//?if?the?user?cancelled?the?dialog,?bail?out
if?(dwPrompt?!=?ERROR_INTERNET_FORCE_RETRY)
{
TRACE(?_T("Access?denied:?Invalid?password\n")?);
//?close?up?the?redirected?site
pFile->Close();
delete?pFile;
pServer->Close();
delete?pServer;
return?bRet;
}
pFile->SendRequest();
pFile->QueryInfoStatusCode(dwRet);
}
//?were?we?redirected?
//?these?response?status?codes?come?from?WININET.H
if?(dwRet?==?HTTP_STATUS_MOVED?||
dwRet?==?HTTP_STATUS_REDIRECT?||
dwRet?==?HTTP_STATUS_REDIRECT_METHOD)
{
CString?strNewLocation;
pFile->QueryInfo(HTTP_QUERY_RAW_HEADERS_CRLF,?strNewLocation);
int?nPlace?=?strNewLocation.Find(_T("Location:?"));
if?(nPlace?==?-1)
{
TRACE(?_T("Error:?Site?redirects?with?no?new?location\n")?);
//?close?up?the?redirected?site
pFile->Close();
delete?pFile;
pServer->Close();
delete?pServer;
return?bRet;
}?
strNewLocation?=?strNewLocation.Mid(nPlace?+?10);
nPlace?=?strNewLocation.Find('\n');
if?(nPlace?>?0)
strNewLocation?=?strNewLocation.Left(nPlace);
strOldLocation?=?strNewLocation;
}
if?(?dwRet?==?HTTP_STATUS_OK?)
{
bRet?=?TRUE;
}
//?close?up?the?redirected?site
pFile->Close();
delete?pFile;
pServer->Close();
delete?pServer;
return?bRet;
}
BOOL?CDownloadFile::GetFtpFile(CInternetSession?&cSession)
{
BOOL?bRet?=?FALSE;
CFile?m_TmpFile;
CFileException?fileException;
if?(?!m_TmpFile.Open?(m_strTmpFileName,?
CFile::modeCreate?|?CFile::modeNoTruncate?|?CFile::modeReadWrite
|?CFile::shareDenyWrite?|?CFile::typeBinary,
&fileException?)?)
{
TRACE(?_T("Open?File?failed:?%d\n"),?fileException.m_cause?);
return?bRet;
}
DWORD?dwCount?=?0;
CFtpConnection?*pFtpConn?=?NULL;
CInternetFile?*pFile?=?NULL;
try
{
CString?strServerName,strObject,strUserName,strPassword;
INTERNET_PORT?nPort?=?0;
DWORD?dwServiceType?=?0;
CString?strRestPointCommand;
if?(!AfxParseURLEx(m_strFileURL,?dwServiceType,?strServerName,?strObject,?nPort,?
strUserName,?strPassword)?||
dwServiceType?!=?INTERNET_SERVICE_FTP)
{
TRACE(?_T("Not?A?Ftp?Quest!\n")?);
}
//?CFtpConnection?ERROR_INTERNET_NO_DIRECT_ACCESS?CInternetSession
if?(strUserName.IsEmpty())
pFtpConn?=?cSession.GetFtpConnection(strServerName,NULL,NULL,nPort,m_bForceReload);
else
pFtpConn?=?cSession.GetFtpConnection(strServerName,strUserName,strPassword,nPort,m_bForceReload);
if?(m_TmpFile.GetLength())
{
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_CURRENTSIZE,m_wFileID),m_TmpFile.GetLength());
m_TmpFile.SeekToEnd();
strRestPointCommand.Format(?_T("REST?%d"),?m_TmpFile.GetLength());
//strRestPointCommand.Format(?_T("ls")?);
if?(?!FtpCommand((*pFtpConn),?FALSE,?FTP_TRANSFER_TYPE_ASCII,?
strRestPointCommand,?0,?0)?)
{
TRACE(?_T("FtpCommand?failed,?error:?%d\n"),?GetLastError());
m_TmpFile.SeekToBegin();
}?
}
if?(pFtpConn)
{
pFile?=?pFtpConn->OpenFile(strObject);
}
}
catch?(CInternetException*?e)
{
TCHAR?szCause[MAX_PATH]?=?{0};
e->GetErrorMessage(szCause,?MAX_PATH);
e->Delete();
delete?pFile;
delete?pFtpConn;
return?bRet;
}
COleDateTime?startTime?=?COleDateTime::GetCurrentTime();
DWORD?dwFtpFileSize?=?0;
if?(pFile)
{
BYTE?buffer[BUFFER_SIZE+1]?=?{0};
try?{
UINT?nRead?=?0;
dwFtpFileSize?=?FtpGetFileSize(?(*pFile),0);
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_FULLSIZE,m_wFileID),dwFtpFileSize);
TRACE(?_T("Totoal?Length?is?%d\n"),?dwFtpFileSize?);
dwCount?=?0;
do
{
nRead?=?pFile->Read(buffer,?BUFFER_SIZE);
if?(nRead?>?0)
{
buffer[nRead]?=?0;
m_TmpFile.Write(buffer,nRead);
COleDateTimeSpan?elapsed?=?COleDateTime::GetCurrentTime()?-?startTime;
double?dSecs?=?elapsed.GetTotalSeconds();
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_DOWNSIZE,m_wFileID),dwCount);
if?(dSecs?>?0.0)
{
dwCount?+=?nRead;
m_transferRate?=?(float)(dwCount?/?1024.0?/?dSecs);
TRACE("Read?%d?bytes?(%0.1f?Kb/s)\n",?dwCount,?m_transferRate?);?
}
else
{
TRACE("Read?%d?bytes\n",?dwCount);
m_transferRate?=?(float)(dwCount?/?1024.0);
}
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_DOWNSPEED,m_wFileID),(LPARAM)m_transferRate);
}
}
while?(nRead?>?0);
bRet?=?TRUE;
}
catch?(CFileException?*e)
{
TCHAR?szCause[MAX_PATH]?=?{0};
e->GetErrorMessage(szCause,?MAX_PATH);
TRACE("ErrorMsg?:?%s\n",?szCause);
e->Delete();
delete?pFile;
pFtpConn->Close();
delete?pFtpConn;
m_TmpFile.Close();
return?FALSE;
}
pFile->Close();
delete?pFile;
m_TmpFile.Close();
pFtpConn->Close();
delete?pFtpConn;
}
return?bRet;
}
BOOL?CDownloadFile::GetUNCFile()
{
BOOL?bRet?=?FALSE;
CFile?m_TmpFile,m_SrcFile;
CFileException?fileException;
CString?strOldLocation?=?m_strFileURL;
if?(?!m_TmpFile.Open?(m_strTmpFileName,?
CFile::modeCreate?|?CFile::modeNoTruncate?|?CFile::modeReadWrite
|?CFile::shareDenyWrite?|?CFile::typeBinary,
&fileException?)?)
{
TRACE(?_T("Open?File?failed:?%d\n"),?fileException.m_cause?);
return?bRet;
}
strOldLocation.TrimLeft();
strOldLocation.TrimRight();
if(?StrCmpNI(strOldLocation,?_T("file:/"),6)?==?0?)
{
strOldLocation?=?strOldLocation.Mid(8);
strOldLocation.Replace(?_T('/'),?_T('\\'));
}
if?(?!m_SrcFile.Open?(?strOldLocation,?
CFile::modeRead?|?CFile::shareDenyWrite?|?CFile::typeBinary,
&fileException?)?)
{
TRACE(?_T("Open?File?failed:?%d\n"),?fileException.m_cause?);
return?bRet;
}
COleDateTime?startTime?=?COleDateTime::GetCurrentTime();
DWORD?dwCount?=?0;
try?{
if?(m_TmpFile.GetLength())
{
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_CURRENTSIZE,m_wFileID),m_TmpFile.GetLength());
m_TmpFile.SeekToEnd();
m_SrcFile.Seek(m_TmpFile.GetLength(),?CFile::begin);
}
BYTE?buffer[BUFFER_SIZE+1]?=?{0};
UINT?nRead?=?0;
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_FULLSIZE,m_wFileID),m_SrcFile.GetLength());
TRACE(?_T("Totoal?Length?is?%d,left?is?%d\n"),?m_SrcFile.GetLength()?,m_SrcFile.GetLength()?-?m_TmpFile.GetLength());
dwCount?=?0;
do
{
nRead?=?m_SrcFile.Read(buffer,?BUFFER_SIZE);
if?(nRead?>?0)
{
buffer[nRead]?=?0;
m_TmpFile.Write(buffer,nRead);
COleDateTimeSpan?elapsed?=?COleDateTime::GetCurrentTime()?-?startTime;
double?dSecs?=?elapsed.GetTotalSeconds();
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_DOWNSIZE,m_wFileID),dwCount);
if?(dSecs?>?0.0)
{
dwCount?+=?nRead;
m_transferRate?=?(float)(dwCount?/?1024.0?/?dSecs);
TRACE("Read?%d?bytes?(%0.1f?Kb/s)\n",?dwCount,?m_transferRate?);?
}
else
{
TRACE("Read?%d?bytes\n",?dwCount);
m_transferRate?=?(float)(dwCount?/?1024.0);
}
PostNotifyMessage(MAKEWPARAM(NOTIFY_MSG_LOW_WPARAM_DOWNSPEED,m_wFileID),(LPARAM)m_transferRate);
}
}
while?(nRead?>?0);
bRet?=?TRUE;
}
catch?(CFileException?*e)
{
TCHAR?szCause[MAX_PATH]?=?{0};
e->GetErrorMessage(szCause,?MAX_PATH);
TRACE("ErrorMsg?:?%s\n",?szCause);
e->Delete();
m_TmpFile.Close();
return?FALSE;
}
m_TmpFile.Close();
return?bRet;
}
void?CDownloadFile::RegisterNotifyWindow(DWORD?dwThreadID,HWND?hWnd,?DWORD?dwMsg)
{
m_dwThreadID?=?dwThreadID;
m_hNotify?=?hWnd;
m_dwMsgID?=?dwMsg;
}
void?CDownloadFile::PostNotifyMessage(WPARAM?wParam,?LPARAM?lParam)
{
if?(m_hNotify)
{
::PostMessage(m_hNotify,?m_dwMsgID,?wParam,?lParam);
}
if?(?m_dwThreadID?)
{
::PostThreadMessage(m_dwThreadID,m_dwMsgID,?wParam,?lParam);
}
}
WORD?CDownloadFile::GenFileID()
{
srand(GetTickCount());
return?rand()?&?0xFFFF;
}
UINT?ThreadDownSingleFile(?LPVOID?pParam?)
{
CDownloadFile?m_DownFile;
UINT?uRet?=?0;
if?(lpDownParam)
{
m_DownFile.m_wFileID?=?m_DownFile.GenFileID();
//這里注冊通知窗口和消息
//m_DownFile.RegisterNotifyWindow
if?(?m_DownFile.DownLoadFile(m_Msg.lpFileSrc,?m_Msg.lpFileDst)?)
{
uRet?=?1;
}
}
return?uRet;
}