Question

This is driving me crazy:

I have function

void gst_init(int *argc, char **argv[]);

in the gstreamer api and I want to call it with some parameters I define, like:

int argc = 2;
char* argv[2] = {"myvalue1", "myvalue2"};
gst_init(&argc, &argv);

This code doesn’t compile (I get error C2664):

error C2664: 'gst_init' : cannot convert parameter 2 from 'char *(*)[2]' to 'char **[]'

The question: How do I define the argv value to pass it as a parameter? I’ve been using C++ for over 5 years, but I haven’t used a raw array since … high-school I think (more than five years ago).

Edit: I’m using VS2010 Express.

Answer 1

Try

int argc = 2;
char* arg1[1] = {"myvalue1"};
char* arg2[1] = {"myvalue2"};
char** argv[2] = { arg1, arg2 };
gst_init(&argc, argv);

char **argv[] is an array of char**, which is analogous to an array of char* arrays.

OTOH what you tried to pass as parameter is shown as char *(*)[2]: a pointer to an array of char*.