How to implement a byte * to point to structure of array elements

[eran yurman]

H,

I need to call an API with the follwoing prototype:

unsigned long CountDevices (BYTE *p_deviceSize,BYTE *p_device );
 

I have no knowledge of the content of the API function itself but it is unimportant. The API should receive values from the network into p_deviceSize and p_device.

p_deviceSize is used as input/output. Upon input it gets the max elements of device array. Upon output, the actual size of the device array.
p_device is a structure of array elements
as follows:
deviceName which is a char[256] element used as an output
deviceKey which is a char[16] element used as an output

and to my question:
1st, the API is currently not applicable because there is no network to return values so what i want to do is write a stub function that will simulate the returning of values into the API's parameters.

How is the correct way to create the CountDevices_t structure? is it correct to create the structures like the below?

typedef struct pDevices_s
{
    char deviceName[256];
    char deviceKey[16];
}pDevices_t;
 
typedef struct CountDevices_s
{
    BYTE p_devicesSize;
    pDevices_t p_device;
}CountDevices_t;
 

In this case it is easy to write a stub that will simulate values to each member of the structures, however this is not what the API intended.
How is the correct way to create the CountDevices_t structure?
How to implement a stub function to fill that structure where BYTE * actually points to a structure of array? casting a pDevices_t to and array member of p_device?

Hope the question is clear.
Thanks in advance.
Eran

[weaknessforcats]

What am I missing?

The function retuns and unsigned long, so hard code a return value.

Ditto for the arrays using BYTE*.

As far as I can see you don't need a struct in your stub.