如何将Win32 lParam转换为C结构？

是的,假设lParam'确实'包含指向结构的指针,那么你通过'cast'得到它:

  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