fork(1) download
copy 
  1. #include <iostream>
  2. #include <cstdlib>
  3. using namespace std;
  4.  
  5. typedef unsigned int DWORD;
  6. typedef void VOID;
  7. typedef wchar_t WCHAR;
  8.  
  9. struct _POWER_BROADCAST
  10. {
  11.     DWORD       Message;
  12.     DWORD       Flags;
  13.     DWORD       Length;
  14.     WCHAR       ptr[1];
  15. };
  16.  
  17. struct _POWER_BROADCAST_POWER_INFO
  18. {
  19.     int data;
  20. };
  21.  
  22. int main()
  23. {
  24.     // 重點是這裡配置的長度
  25.     _POWER_BROADCAST* realObject =
  26.         (_POWER_BROADCAST*)malloc(sizeof(_POWER_BROADCAST) + sizeof(_POWER_BROADCAST_POWER_INFO));
  27.  
  28.     realObject->Message = 7788;
  29.     realObject->Length = 123;
  30.  
  31.     _POWER_BROADCAST_POWER_INFO *Data =
  32.         (_POWER_BROADCAST_POWER_INFO *)realObject->ptr;
  33.     Data->data = 5566;
  34.  
  35.     //先印出message, 成功
  36.     cout<<realObject->Message<<endl;
  37.  
  38.     _POWER_BROADCAST_POWER_INFO* ptr2 =
  39.         (_POWER_BROADCAST_POWER_INFO*)realObject->ptr;
  40.  
  41.     cout<<ptr2->data;
  42. }
  43.  
Success #stdin #stdout 0.02s 2856KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
7788
5566
https://ideone.com/XIzAT
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!