我初始化的时候读出上一次保存的UID，收到邮件时保存UID到文件中，并且比较这一次的邮件是否和保存的UID相同，相同的就不读出来，就是判断新邮件，现在完全没有反应，请赐教，底下是保存和读取UID的代码！O(∩_∩)O谢谢了
if ((fp1 = fopen("d:\\topgun.txt", "r")) == NULL)
{
  exit(0);   
}
  fread(DiskID, 15, 1, fp1);
  fclose(fp1);


for(long i = 1; i <= lCount; i++)  
  {  
char *a = pPOP3->GetMessageUID(i);
int alen = strlen(a);

  pMessage = pMessages->Item[i];  
 
custom1.bstrSubject = pMessage->Subject;  
  custom1.bstrFrom= pMessage->From;  
  custom1.bstrBody = pMessage->Body;

if(a!=DiskID)
  {
printf("(%d)Subject:%s, From:%s, Body:%s\r\n", i, (const char*)custom1.bstrSubject , (constchar*) custom1.bstrFrom, (const char*)custom1.bstrBody); pMessage.Release();  
}


FILE *fp;
  if ((fp = fopen("d:\\topgun.txt", "ab+")) == NULL)
{
  exit(0);   
}
  fwrite(a, sizeof(char), 1, fp);
  fclose(fp);
}