由于下用价值，包括指针传递参数，你需要通过的地址指针的焦炭** ，一个函数，使函数指针指向不同的地址，并有给调用者可见的那些变化：

As C passes arguments by value, including pointers, you need to pass the address of the pointers, char**, to a function to enable the function to point the pointers to a different address and have those changes visible to the caller:

int genratedCamData(int CAM, char** datafirst , char **datasecond)
{
    *datafirst=getCam1data();
    *datasecond=malloc(100); /* sizeof(char) is guaranteed to be 1. */
}

调用：

char* data1;
char* data2;
genratedCamData(1, &data1 , &data2);