python - How to use struct information from mouse/keyboard hook in ctypes -

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so i've got c code looks this:

#pragma comment(linker, "/section:.shared,rws") #pragma data_seg(".shared") hmodule hinstance = 0; hhook hkeyboardhook = 0; int lastkey = 0; int keyflags = 0;  hhook hmousehook = 0; int mousemsgid = 0; mousehookstruct *mhookpt; mousehookstruct mhookstruct;  #pragma data_seg()  bool winapi dllmain(handle hmodule, dword dwfunction, lpvoid lpnot) {     hinstance = hmodule;     return true; }  lresult callback keyboardproc(int hookcode, wparam vkeycode, lparam flags) {     if(hookcode < 0)     {         return callnexthookex(hkeyboardhook, hookcode, vkeycode, flags);     }      if(!hookcode)     {         lastkey = (int)vkeycode;         keyflags = (int)flags;     }      return callnexthookex(hkeyboardhook, hookcode, vkeycode, flags); }  lresult callback mouseproc(int hookcode, wparam msgid, lparam pmousehookstruct) {     if(hookcode < 0)     {         return callnexthookex(hmousehook, hookcode, msgid, pmousehookstruct);     }      if(!hookcode)     {         mousemsgid = (int)msgid;         mhookpt = (mousehookstruct *)pmousehookstruct;         mhookstruct = *mhookpt;     }     return callnexthookex(hmousehook, hookcode, msgid, pmousehookstruct); }  __declspec(dllexport) int getlastkey(void) {     if(!lastkey)         return 0;     return lastkey; }  __declspec(dllexport) int getlastflags(void) {     if(!keyflags)         return 0;     return keyflags; }  __declspec(dllexport) int getmsgid(void) {     if(!mousemsgid)         return 0;     return mousemsgid; }  __declspec(dllexport) mousehookstruct getmousestruct(void) {     return mhookstruct; }  __declspec(dllexport) void installhooks(void) {     hkeyboardhook = setwindowshookex(wh_keyboard, keyboardproc, hinstance, 0);     hmousehook = setwindowshookex(wh_mouse, mouseproc, hinstance, 0); }  __declspec(dllexport) void uninstallhooks(void) {     unhookwindowshookex(hkeyboardhook);     hkeyboardhook = 0;     lastkey = 0;     keyflags = 0;      unhookwindowshookex(hmousehook);     mousemsgid = 0;     mhookpt = null;  }

it's compiled dll, loaded python using ctypes.cdll('blah.dll'):

class mousehookstruct(ctypes.wintypes.structure):      _fields_ = [("pt", ctypes.wintypes.point),              ("hwnd", ctypes.wintypes.hwnd),              ("dwextrainfo", ctypes.wintypes.pointer(ctypes.wintypes.c_ulong))]  dll = ctypes.cdll('blah.dll') dll.getmousestruct.restype = mousehookstruct try:     dll.installhooks()     mstruct = mousehookstruct()     while true:         mstruct = dll.getmousestruct()         print mstruct.pt.x, mstruct.pt.y except keyboardinterrupt:     pass finally:     dll.uninstallhooks()

all print out 0 0 regardless of mouse is. keyboard hook fine because callback proc not make use of struct. however, if try wh_keyboard_ll have same issue (all values of struct 0). missing passing structs between os, c , pythons ctypes?


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