Add RealGetWindowClass (#2299)

Author: CristiFati

CHANGES.txt

@@ -15,6 +15,7 @@ Coming in build 307, as yet unreleased
 --------------------------------------
 
 ### pywin32
+* Add RealGetWindowClass (#2299, @CristiFati)
 * Make it compile on Python 3.13 (#2260, @clin1234)
 * Fixed accidentally trying to raise a `str` instead of an `Exception` in (#2270, @Avasam)
   * `Pythonwin/pywin/debugger/debugger.py`

win32/src/win32gui.i

@@ -5998,26 +5998,49 @@ PyGetScrollInfo (PyObject *self, PyObject *args)
 %native (GetScrollInfo) PyGetScrollInfo;
 
 %{
+#define MAX_CHARS 0x100
+
 // @pyswig string|GetClassName|Retrieves the name of the class to which the specified window belongs.
 static PyObject *
 PyGetClassName(PyObject *self, PyObject *args)
 {
-	HWND hwnd;
-	PyObject *obhwnd;
-	TCHAR buf[256];
-	// @pyparm <o PyHANDLE>|hwnd||The handle to the window
-	if (!PyArg_ParseTuple(args, "O:GetClassName", &obhwnd))
-		return NULL;
-	if (!PyWinObject_AsHANDLE(obhwnd, (HANDLE *)&hwnd))
-		return NULL;
-	// don't bother with lock - no callback possible.
-	int nchars = GetClassName(hwnd, buf, sizeof buf/sizeof buf[0]);
-	if (nchars==0)
-		return PyWin_SetAPIError("GetClassName");
-	return PyWinObject_FromTCHAR(buf, nchars);
+    HWND hwnd;
+    PyObject *obhwnd;
+    TCHAR buf[MAX_CHARS];
+    // @pyparm <o PyHANDLE>|hwnd||The handle to the window
+    if (!PyArg_ParseTuple(args, "O:GetClassName", &obhwnd))
+        return NULL;
+    if (!PyWinObject_AsHANDLE(obhwnd, (HANDLE*)&hwnd))
+        return NULL;
+    // don't bother with lock - no callback possible.
+    int nchars = GetClassName(hwnd, buf, MAX_CHARS);
+    if (nchars == 0)
+        return PyWin_SetAPIErrorOrReturnNone("GetClassName");
+    return PyWinObject_FromTCHAR(buf, nchars);
 }
+
+// @pyswig string|RealGetWindowClass|Retrieves the name of the class to which the specified window belongs.
+static PyObject *
+PyRealGetWindowClass(PyObject *self, PyObject *args)
+{
+    HWND hwnd;
+    PyObject *obhwnd;
+    TCHAR buf[MAX_CHARS];
+    // @pyparm <o PyHANDLE>|hwnd||The handle to the window
+    if (!PyArg_ParseTuple(args, "O:RealGetWindowClass", &obhwnd))
+        return NULL;
+    if (!PyWinObject_AsHANDLE(obhwnd, (HANDLE*)&hwnd))
+        return NULL;
+    // don't bother with lock - no callback possible.
+    UINT nchars = RealGetWindowClass(hwnd, buf, MAX_CHARS);
+    if (nchars == 0)
+        return PyWin_SetAPIErrorOrReturnNone("RealGetWindowClass");
+    return PyWinObject_FromTCHAR(buf, nchars);
+}
+
 %}
 %native (GetClassName) PyGetClassName;
+%native (RealGetWindowClass) PyRealGetWindowClass;
 
 // @pyswig int|WindowFromPoint|Retrieves a handle to the window that contains the specified point.
 // @pyparm (int, int)|point||The point.

win32/test/test_win32gui.py

@@ -209,5 +209,20 @@ def test_enumdesktopwindows(self):
                     )
 
 
+class TestWindowProperties(unittest.TestCase):
+    def setUp(self):
+        self.class_functions = (
+            win32gui.GetClassName,
+            win32gui.RealGetWindowClass,
+        )
+
+    def test_classname(self):
+        for func in self.class_functions:
+            self.assertRaises(pywintypes.error, func, 0)
+        wnd = win32gui.GetDesktopWindow()
+        for func in self.class_functions:
+            self.assertTrue(func(wnd))
+
+
 if __name__ == "__main__":
     unittest.main()