FILE *fp;
 if ((fp = fopen("example.txt", "rb")) == NULL)
 {
  exit(0);
 }
 fseek(fp, 0, SEEK_END);
 int fileLen = ftell(fp);
 char *tmp = (char *) malloc(sizeof(char) * fileLen);
 fseek(fp, 0, SEEK_SET);
 fread(tmp, fileLen, sizeof(char), fp);
 fclose(fp);
 for(int i = 0; i < fileLen; ++i)
 {
  printf("%d  ", tmp[i]);
 }
 printf("/n");

 if ((fp = fopen("example.txt", "wb")) == NULL)
 {
  exit(0);
 }
 rewind(fp);
 fwrite(tmp, fileLen, sizeof(char), fp);
 fclose(fp);
 free(tmp);

CFile fp;
if(!(fp.Open((LPCTSTR)m_strsendFilePathName,CFile::modeRead)))
{
    return;
}
fp.SeekToEnd();
unsignedint fpLength = fp.GetLength();
char *tmp= new char[fpLength];
fp.SeekToBegin();    //這一句必不可少
if(fp.Read(tmp,fpLength) < 1)
{
    fp.Close();
    return;
}

if(!(fp.Open((LPCTSTR)m_strsendFilePathName,
        CFile::modeCreate | CFile::modeWrite |CFile::typeBinary)))
{
    return;
}
fp.SeekToBegin();
fp.write(tmp,fpLength);
fp.close;