C++下载数据至.map/.txt/.list文件

bool IsExistFile(LPCTSTR pszFileName) //判断文件是否存在
 { 
    WIN32_FIND_DATA FindFileData; 
     HANDLE hFind; 
 
     hFind = ::FindFirstFile(pszFileName,&FindFileData);     
 
    if(hFind == INVALID_HANDLE_VALUE)   
         return   false; 
     else 
     { 
         FindClose(hFind); 
         return   true; 
     } 
     return   false; 
 }
 
bool DataInteraction(int nSendLen, int nHolpRecv, int& nRecvLen, int nDevID)  //写入文件
{

BYTE RecvBuf[4096] = {'\0'};

BYTE buf[4096] = {'\0'};

string strr = "";
string strr1 = "";
strr1 = str09B;
if(str09B == "")  输入文件名
{
    return false;
}
strr = "C:\\MSG\\" + strr1;

CFile file;
BOOL IsFile = IsExistFile(strr.c_str());
if(IsFile == FALSE)
{
    file.Open(strr.c_str(),CFile::modeCreate|CFile::modeReadWrite);   读写属性新建文件
}
else
{
    if (remove(strr.c_str()) == 0)    删除后新建，可不要
    {
        Sleep(5);
        file.Open(strr.c_str(),CFile::modeCreate|CFile::modeReadWrite);
    }
    else
    {
        file.Open(strr.c_str(),CFile::modeReadWrite);
    }
}

for(int i = 0; i > 2047 || (RecvBuf[5 + i] != 0x03);i++)
{
    buf[i] = RecvBuf[3 + i];
}
int len = file.GetLength();
if(len == 0)
    file.Seek(0,CFile::begin);
else
    file.SeekToEnd();

TCHAR stt[4096] = {0};
memcpy(stt,RecvBuf,sizeof(RecvBuf));
int len1 = strlen(stt);

file.Write(buf,len1);   防止写入过多空格
file.Flush();
file.Close();
memset(buf,'\0',sizeof(BYTE));
memset(RecvBuf,'\0',4096);   
}