mousehook_lib.c

   1 #include <windows.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4
   5 static HHOOK hMyHook = NULL;
   6
   7 HINSTANCE hInstance;
   8
   9 BOOL WINAPI DllMain(HINSTANCE hInst, DWORD fdwReason, LPVOID lpvReserved)
  10 {
  11     if(fdwReason == DLL_PROCESS_ATTACH) {
  12         hInstance = hInst;
  13     }
  14
  15     return TRUE;
  16 }
  17
  18 LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
  19 {
  20     if(nCode < 0) {
  21         return CallNextHookEx(hMyHook, nCode, wParam, lParam);
  22     }
  23     else if(nCode == HC_ACTION) {
  24         if(wParam == WM_LBUTTONDOWN) {
  25             LPMOUSEHOOKSTRUCT lpMouseStruct = (LPMOUSEHOOKSTRUCT)lParam;
  26
  27             printf("clicked(left) x %d y %d\n", lpMouseStruct->pt.x, lpMouseStruct->pt.y);
  28             return CallNextHookEx(hMyHook, nCode, wParam, lParam);
  29         }
  30         else if(wParam == WM_RBUTTONDOWN) {
  31             LPMOUSEHOOKSTRUCT lpMouseStruct = (LPMOUSEHOOKSTRUCT)lParam;
  32
  33             printf("clicked(right) x %d y %d\n", lpMouseStruct->pt.x, lpMouseStruct->pt.y);
  34             return CallNextHookEx(hMyHook, nCode, wParam, lParam);
  35         }
  36         else if(wParam == WM_MOUSEMOVE) {
  37             LPMOUSEHOOKSTRUCT lpMouseStruct = (LPMOUSEHOOKSTRUCT)lParam;
  38
  39             printf("moving x %d y %d\n", lpMouseStruct->pt.x, lpMouseStruct->pt.y);
  40             return CallNextHookEx(hMyHook, nCode, wParam, lParam);
  41         }
  42         else {
  43             return CallNextHookEx(hMyHook, nCode, wParam, lParam);
  44         }
  45     }
  46     else {
  47         return CallNextHookEx(hMyHook, nCode, wParam, lParam);
  48     }
  49 }
  50
  51 __declspec(dllexport) __stdcall void SetHook(HINSTANCE hModule)
  52 {
  53     hMyHook = SetWindowsHookEx(WH_MOUSE_LL
  54         , MouseProc
  55         , hModule
  56         , 0);
  57
  58     if(hMyHook == NULL)
  59     {
  60         LPVOID lpMsgBuf;
  61         FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&lpMsgBuf, 0, NULL);
  62         printf("%s", lpMsgBuf);
  63         LocalFree(lpMsgBuf);
  64         exit(0);
  65     }
  66 }
  67
  68 __declspec(dllexport) __stdcall void RemoveHook()
  69 {
  70     if(hMyHook) {
  71         (void)UnhookWindowsHookEx(hMyHook);
  72         hMyHook = NULL;
  73     }
  74 }
  75