pid_alive() now works under Windows64

src/gajim.py

@@ -250,7 +250,7 @@ def pid_alive():
     if os.name == 'nt':
         try:
             from ctypes import (windll, c_ulong, c_int, Structure, c_char)
-            from ctypes import (POINTER, pointer, )
+            from ctypes import (POINTER, pointer, sizeof)
         except Exception:
             return True
 
@@ -267,26 +267,26 @@ def pid_alive():
                     ('dwFlags', c_ulong, ),
                     ('szExeFile', c_char*512, ),
                     ]
-            def __init__(self):
-                super(PROCESSENTRY32, self).__init__(self, 512+9*4)
 
-        k = windll.kernel32
-        k.CreateToolhelp32Snapshot.argtypes = c_ulong, c_ulong,
-        k.CreateToolhelp32Snapshot.restype = c_int
-        k.Process32First.argtypes = c_int, POINTER(PROCESSENTRY32),
-        k.Process32First.restype = c_int
-        k.Process32Next.argtypes = c_int, POINTER(PROCESSENTRY32),
-        k.Process32Next.restype = c_int
+        kernel = windll.kernel32
+        kernel.CreateToolhelp32Snapshot.argtypes = c_ulong, c_ulong,
+        kernel.CreateToolhelp32Snapshot.restype = c_int
+        kernel.Process32First.argtypes = c_int, POINTER(PROCESSENTRY32),
+        kernel.Process32First.restype = c_int
+        kernel.Process32Next.argtypes = c_int, POINTER(PROCESSENTRY32),
+        kernel.Process32Next.restype = c_int
 
         def get_p(pid_):
-            h = k.CreateToolhelp32Snapshot(2, 0) # TH32CS_SNAPPROCESS
-            assert h > 0, 'CreateToolhelp32Snapshot failed'
-            b = pointer(PROCESSENTRY32())
-            f3 = k.Process32First(h, b)
+            TH32CS_SNAPPROCESS = 2
+            CreateToolhelp32Snapshot = kernel.CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0)
+            assert CreateToolhelp32Snapshot > 0, 'CreateToolhelp32Snapshot failed'
+            pe32 = PROCESSENTRY32()
+            pe32.dwSize = sizeof( PROCESSENTRY32 )
+            f3 = kernel.Process32First(CreateToolhelp32Snapshot, pointer(pe32))
             while f3:
-                if b.contents.th32ProcessID == pid_:
-                    return b.contents.szExeFile
-                f3 = k.Process32Next(h, b)
+                if pe32.th32ProcessID == pid_:
+                    return pe32.szExeFile
+                f3 = kernel.Process32Next(CreateToolhelp32Snapshot, pointer(pe32))
 
         if get_p(pid) in ('python.exe', 'gajim.exe'):
             return True