native/focusKiller/focuskiller.cpp

   1 #include <windows.h>
   2
   3 // NT 4 doesn't have FlashWindowEx.
   4 typedef BOOL (WINAPI *t_FlashWindowEx)(FLASHWINFO*);
   5 t_FlashWindowEx p_FlashWindowEx;
   6 #define FlashWindowEx p_FlashWindowEx
   7
   8 #ifdef USE_DETOURS
   9 #include "detours.h" // see http://research.microsoft.com/sn/detours/
  10 extern "C" {
  11     DETOUR_TRAMPOLINE(BOOL WINAPI Real_SetForegroundWindow(HWND hWnd), SetForegroundWindow);
  12 }
  13 #else
  14 // IAT patching hook method. See http://www.naughter.com/hookimportfunction.html
  15 // compile with cl /LD focuskiller.cpp HookImportFunction.cpp user32.lib
  16 #include "HookImportFunction.h"
  17
  18 typedef BOOL (WINAPI *t_SetForegroundWindow)(HWND);
  19 t_SetForegroundWindow Real_SetForegroundWindow;
  20 #endif
  21
  22 DWORD mypid;
  23
  24 BOOL WINAPI Mine_SetForegroundWindow(HWND hWnd)
  25 {
  26     DWORD pid;
  27     HWND fg = GetForegroundWindow();
  28     HWND owner = GetWindow(hWnd, GW_OWNER);
  29     GetWindowThreadProcessId(fg, &pid);
  30
  31 #ifdef _DEBUG
  32     char buf[500];
  33     wsprintf(buf, "SetForegroundWindow(%x): owner = %x, %d <-> %d", hWnd, owner, pid, mypid);
  34     OutputDebugString(buf);
  35 #endif
  36
  37     // Disallow if
  38     //  a) another process' window is in the foreground
  39     //  b) the window to be put in front is a top-level window (should avoid putting one IDEA project in front of another one)
  40     if (mypid != pid || owner == NULL) {
  41         if (FlashWindowEx != NULL) {
  42             FLASHWINFO fw;
  43             fw.cbSize = sizeof(fw);
  44             fw.hwnd = hWnd;
  45             fw.uCount = 5;
  46             fw.dwTimeout = 0;
  47
  48             fw.dwFlags = FLASHW_TRAY | FLASHW_TIMERNOFG;
  49             FlashWindowEx(&fw);
  50         } else {
  51             FlashWindow(hWnd, TRUE);
  52         }
  53         return TRUE; // fake success
  54     }
  55
  56     return Real_SetForegroundWindow(hWnd);
  57 }
  58
  59 void HookFunctions(HMODULE hModule)
  60 {
  61 #ifdef USE_DETOURS
  62 #ifdef _DEBUG
  63     OutputDebugString("Using Detours hook...");
  64 #endif
  65
  66     DetourFunctionWithTrampoline((PBYTE)Real_SetForegroundWindow,
  67                                  (PBYTE)Mine_SetForegroundWindow);
  68 #else
  69 #ifdef _DEBUG
  70     OutputDebugString("Using IAT patching hook...");
  71 #endif
  72
  73     HOOKFUNCDESC hook;
  74     hook.szFunc = "SetForegroundWindow";
  75     hook.pProc = (PROC)Mine_SetForegroundWindow;
  76
  77     // hooking LoadLibrary and waiting until awt.dll is being loaded by java would be more correct but this works too
  78     HMODULE awtModule = LoadLibrary("awt.dll");
  79
  80     BOOL b = HookImportFunctionsByName(awtModule, "user32.dll", 1, &hook, (PROC *)&Real_SetForegroundWindow, NULL);
  81     if (!b) {
  82         char buf[200];
  83         wsprintf(buf, "Hooking SetForegroundWindow failed [0x%x]", GetLastError());
  84         OutputDebugString(buf);
  85     }
  86 #endif
  87
  88 #ifdef _DEBUG
  89     OutputDebugString("Functions hooked");
  90 #endif
  91 }
  92
  93 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved)
  94 {
  95     if (fdwReason == DLL_PROCESS_ATTACH) {
  96 #ifdef _DEBUG
  97         char buf[200];
  98         wsprintf(buf, "DLL Attached");
  99         OutputDebugString(buf);
 100 #endif
 101
 102         mypid = GetCurrentProcessId();
 103         p_FlashWindowEx = (t_FlashWindowEx)GetProcAddress(GetModuleHandle("user32.dll"), "FlashWindowEx");
 104
 105         DisableThreadLibraryCalls((HMODULE)hinstDLL);
 106
 107         HookFunctions((HMODULE)hinstDLL);
 108     }
 109
 110     return TRUE;
 111 }
 112