标签:sprint mat aaa height bae failed and exe width
1. 宏传递变长参数:
最近用C语言写一个程序,经常调用shell或者其他命令,代码中多处出现如下代码:
char script_cmd[CMD_MAX_LEN + 1] = {‘\0‘}; memset(script_cmd, 0, sizeof(script_cmd)); sprintf(script_cmd, "cmd %s %s", param1, param2); system(script_cmd);
每调用一次就是三行代码,看着也十分不爽。偶然间学会通过宏传递参数,代码瞬间简化很多:
#define EXECUTE_SCRIPT(script_cmd_array, format,args...) \ memset(script_cmd_array, 0, sizeof(script_cmd_array)); sprintf(script_cmd_array, format, ##args); system(script_cmd_array); char script_cmd[CMD_MAX_LEN + 1] = {‘\0‘}; EXECUTE_SCRIPT(script_cmd, "cmd %s %s", param1, param2);
2. 宏中参数当做字符串使用
1 #define REMOVE_SHMEM(shmid) 2 if (shmid != -1) { 3 if (shmctl(shmid, IPC_RMID, NULL) == -1) { 4 printf("remove %s failed!\n", #shmid); 5 } 6 } 7 8 int main (void) 9 { 10 int myshm = 123; 11 12 REMOVE_SHMEM(myshm); 13 }
输出:
remove myshm failed!
标签:sprint mat aaa height bae failed and exe width
原文地址:https://www.cnblogs.com/luoyingcai/p/11142244.html