保存数据到文件中

 
#define SINGLE_WRITE_LEN 1024
  int dh_save_file(unsigned char *data_buf, int data_len,
     const char *file_name)
 {    
     int retval = STATUS_PARSE_OK;

     int remain_len = data_len;
     int writen_len = 0;    
     int single_write_len = 0;

     FILE *fp = NULL;
    
     if(data_buf == NULL || file_name == NULL || data_len <= 0)
     {
         return STATUS_PARSE_FUNC_PARAM_ERROR;
     }
    
     // 打开文件
     fp = fopen(file_name, "wb");
     if(fp == NULL)
     {
         return STATUS_PARSE_OPEN_FILE_FAILED;
     }
    
     while(remain_len > 0)
     {
         single_write_len = remain_len > SINGLE_WRITE_LEN ? SINGLE_WRITE_LEN :remain_len;
         writen_len = fwrite(data_buf+data_len-remain_len, 1, single_write_len, fp);
         if(writen_len < 0)
         {
             fclose(fp);
             return STATUS_PARSE_WRITE_FILE_FAILED;
         }
         remain_len = remain_len - writen_len;
     }
    
     fclose(fp);
    
     return retval;    
 }