CSocket文件传输 分段传输的关键代码

struct FILEINFO
{
int fileLength;//文件长度
char fileName[100];//文件名
};

CFileDialog fileDialog(TRUE);//选择文件
if (fileDialog.DoModal()==IDOK)
{
CString filename = fileDialog.GetPathName();//文件路径
CString name = fileDialog.GetFileName();//文件名字

//发送文件
CFile file;
if(file.Open(filename,CFile::modeReadWrite|CFile::typeBinary))
{//打开文件

FILEINFO myFileInfo;//文件结构
int length = file.GetLength();//获取文件的长度
m_CtrlProgressSend.SetRange32(0,length);//设置进度条大小
m_CtrlProgressSend.SetPos(0);
myFileInfo.fileLength = length;//赋值文件长度
strcpy(myFileInfo.fileName,name.GetBuffer(name.GetLength()));//拷贝文件名
name.ReleaseBuffer();//释放buffer

int iBufSize = 1024*5;//设置文件缓冲区长度
int iSize = iBufSize ; //一次读取的长度
LPBYTE pBuf=new BYTE[iBufSize];//定义缓冲区

m_sockClient.Send(&myFileInfo,sizeof(myFileInfo));//发送文件头信息

//发送文件
int iNnmByte;
UINT uiTotal = 0 ;
while (uiTotal<length)
{
if (length-uiTotal < iBufSize)//如果发送小于1024*5 ，则发送剩余那些....
iSize = length-uiTotal;
iSize = file.Read(pBuf,iSize);//读取文件到缓冲区

iNnmByte = m_sockClient.Send(pBuf,iSize);//发送剩下iSize-iCount的文件
uiTotal += iNnmByte;//uiTotal总发送量
m_CtrlProgressSend.SetPos(uiTotal);

}

}
m_info.ReplaceSel("发送文件完毕\r\n");
file.Close();
}

m_CtrlProgressSend.SetPos(0);
}

FILEINFO myFileInfo;
m_client.Receive(&myFileInfo,sizeof(myFileInfo));//接受文件信息

m_progress.SetRange32(0,myFileInfo.fileLength);//设置进度

CString str;
str.Format(myFileInfo.fileName);//文件名字

CFile file;
if (file.Open(str,CFile::modeCreate|CFile::modeWrite))
{
UINT uiLength;
uiLength = myFileInfo.fileLength ;//文件长度

int iBufSize = 1024*5;
int iSize = iBufSize ;
LPBYTE pBuf = new BYTE[iBufSize];
int iNumByte;
UINT uiTotal = 0 ;

while (uiTotal < uiLength)
{
if (uiLength-uiTotal<iBufSize)
iSize = uiLength - uiTotal ;

iNumByte = m_client.Receive(pBuf,iSize);
file.Write(pBuf,iNumByte);//写入文件
uiTotal+=iNumByte;
m_progress.SetPos(uiTotal);

}

if (pBuf)
{
delete[]  pBuf;
pBuf = NULL;
}
}
file.Close();
m_info.ReplaceSel("接受文件成功\r\n");
m_progress.SetPos(0);