Pass parameter to a thread

[binks]

When I remove the [], I get this error in my DownloadUpdates function. (which I call in the CheckForUpdate function ~ which is the new thread)

`void*' is not a pointer-to-object type

Function which is called in CheckForUpdate (the thread function)

void DownloadUpdates(void *file)
{
     int j;
     
     for(j = 0; j < num_files; j++)
     {
           SendMessage(hwndpb, PBM_SETPOS, 0, 0);
           //DownloadFile(file[j].name, file[j].outName); for reg struct
           DownloadFile((*file)[j].name, (*file)[j].outName); // error on this line
     }
}

I need to be able to cycle through the contents of the file structure (however many items there will be) and execute on the appropriate ones.

[DeadPlanet]

When you use a void pointer the compiler no longer knows what the original type of the variable was. You can't just expect the compiler to know that your 'file' variable is actually some sort of structure when you've made it a void variable.

This is why we cast the void pointer to whatever it is supposed to be, so that it can be properly accessed:

int DoSomething( void *var1 )
{
        int *var1cast = (int*)var1;
        
        return *var1cast + 1;
}

int main( void )
{
        int num;

        num = 10;

        printf( "%d\n", DoSomething( (void*)&num ) );

        return 0;
}

Some of this may be wrong. It's been a while since I've even used void pointers and it's not like I ever used them very much. Note that this code only demonstrates the syntactic usage of void pointers. It does not actually show a situation in which void pointers would be used.