如何在ubuntu中使用C语言在.dat文件中追加数据？

Question

这里是在即时得到错误代码....

for (i=0; i<portcount; i++) 
{ 
    printf("%f ", ccds[i]/100000); 
    fp=fopen("/administrator/IDS/et.dat", "a"); 
    //fprintf(fp, "er");   
    fprintf(fp, "%d ", (int)ccds[i]/100000); 
    fclose(fp); 
} 

Answer 1

您应该检查该文件实际上是打开成功，而且很可能也把文件打开/关闭外循环：

fp = fopen("/administrator/IDS/et.dat", "a"); 
if (fp == NULL)    // always check for success when opening a file 
{ 
    perror("fopen failed"); 
} 
else 
{ 
    for (i = 0; i < portcount; i++) 
    { 
     fprintf(fp, "%d ", (int)ccds[i]/100000); 
    } 
    fclose(fp); 
}