Question

Say I have some windows method and a struct:

struct SomeStruct{ int foo; int bar; int baz; int bat; }  SomeMethod(int a,int wParam, int lParam) {    SomeStruct s;     // get lParam into SomeStruct } 

How to I get the lParam into a SomeStruct variable? I’m thinking that I need something like this (but feel free to point out my ignorance):

SomeMethod(int a, int wParam, int lParam) {   SomeStruct *s; //declare struct variable   s = lParam;    //assign integer value as pointer to struct   printf('the value of s.foo is %d', s.foo);  //print result } 

Answer 1

Yes, assuming that lParam ‘really’ contains a pointer to the struct, then you get at it by ‘casting’:

  SomeStruct* s; //declare pointer-to-struct variable   s = (SomeStruct*) lParam;    //assign integer value as pointer to struct   printf('the value of s->foo is %d', s->foo);  //print result