Please fill in the blanks (only 2)

[Alan777]

New to C++. Please help me fill in the blanks which I have commented in the code below. I don't understand how to directly access char array arguments in a function.
(This is a Dll Export function to be called from VB)
The third parameter is a string which will be changed by the function. That is what I don't know how to do.
Apart from that, this code already works - I have tested it.

int _stdcall ShowOpenDlgAjP(HWND hOwner, char Filter[],/* this is where I need a buffer for the return path */  )
{
	OPENFILENAME ofn;
	int result;

	memset(&ofn,0,sizeof(OPENFILENAME));

	ofn.lStructSize  = sizeof(OPENFILENAME);
	ofn.hwndOwner = hOwner;
	ofn.lpstrFilter = Filter;
	ofn.nFilterIndex = 1;
	ofn.lpstrFile = "";
	ofn.nMaxFile = 256;
	ofn.Flags = OFN_FILEMUSTEXIST|OFN_HIDEREADONLY;

	result = GetOpenFileName(&ofn);
	
	//this is where I want to assign ofn.lpstrFile to the return buffer 
	return result;
}