您需要另一个宏，因为宏扩展不会在附近进行＃或 ## ：

You need another macro because macro expansion does not take place near # or ##:

#define NUM_ARGS() 2
#define MYMACRO0(...) "no args"
#define MYMACRO1(...) "one arg"
#define MYMACRO2(...) "two args"
#define MYMACRO_AUX(num,...) MYMACRO##num(__VA_ARGS__)
#define MYMACRO(num,...) MYMACRO_AUX(num, __VA_ARGS__)
#define GENERATE(...) MYMACRO(NUM_ARGS(),__VA_ARGS__)

#include <stdio.h>

int main(void)
{
    puts(GENERATE(0, 1));

    return 0;
}

如果这是您要尝试执行的操作，但复杂的预处理器技巧是就像别人已经说过的那样，不是很安全，除非确实需要，否则不要这样做。

If this is what you're trying to do, but complicated preprocessor tricks are not really safe, as others already said, don't do it unless you really have to.