#include <stdio.h>
FILE * wirte_debug_file=NULL;
//将调试信息写到文件中 
void write_Debug_to_file(char *debug_log)
{
 if(wirte_debug_file==NULL)
 wirte_debug_file = fopen("debug.txt","wt");
 if(wirte_debug_file==NULL)
 return;
 fputs(debug_log,wirte_debug_file);
}
int main(void)
{
 int i ;
 char buf[100];
 for(i = 0 ; i < 10 ; i++)
 {
 sprintf(buf,"i:%d\n",i);
 //写调试信息 
 write_Debug_to_file(buf);
 }
 if(wirte_debug_file != NULL)
 fclose(wirte_debug_file);
 return 0 ;
}