Fix DispatchWithEvents and WithEvents throw on 2nd call (#2491)

Author: Avasam

CHANGES.txt

@@ -13,8 +13,9 @@ https://mhammond.github.io/pywin32_installers.html .
 
 Coming in build 310, as yet unreleased
 --------------------------------------
-* Drop support for Vista, set Windows 7 as the minimal Windows version. (#, @Avasam)
-  * Restores many IIDs in `win32com(ext).shell.shell`. See #2486 for details.
+* Fixed a regression where `win32com.client.DispatchWithEvents` and win32com.client.WithEvents` would throw a `TypeError` on the second call (#2491, @Avasam)
+* Dropped support for Vista, set Windows 7 as the minimal Windows version. (#2487, @Avasam)
+* Restored many IIDs in `win32com(ext).shell.shell`. See #2486 for details. (#2487, @Avasam)
 
 Build 309, released 2025/03/09
 ------------------------------

com/win32com/client/__init__.py

@@ -269,23 +269,24 @@ def __get_disp_and_event_classes(dispatch):
     disp = Dispatch(dispatch)
 
     if disp.__class__.__dict__.get("CLSID"):
-        return disp.__class__
+        disp_class = disp.__class__
+    else:
+        # Eeek - no makepy support - try and build it.
+        error_msg = "This COM object can not automate the makepy process - please run makepy manually for this object"
+        try:
+            ti = disp._oleobj_.GetTypeInfo()
+            disp_clsid = ti.GetTypeAttr()[0]
+            tlb, index = ti.GetContainingTypeLib()
+            tla = tlb.GetLibAttr()
+            gencache.EnsureModule(tla[0], tla[1], tla[3], tla[4], bValidateFile=0)
+            # Get the class from the module.
+            disp_class = gencache.GetClassForProgID(str(disp_clsid))
+        except pythoncom.com_error as error:
+            raise TypeError(error_msg) from error
+
+        if disp_class is None:
+            raise TypeError(error_msg)
 
-    # Eeek - no makepy support - try and build it.
-    error_msg = "This COM object can not automate the makepy process - please run makepy manually for this object"
-    try:
-        ti = disp._oleobj_.GetTypeInfo()
-        disp_clsid = ti.GetTypeAttr()[0]
-        tlb, index = ti.GetContainingTypeLib()
-        tla = tlb.GetLibAttr()
-        gencache.EnsureModule(tla[0], tla[1], tla[3], tla[4], bValidateFile=0)
-        # Get the class from the module.
-        disp_class = gencache.GetClassForProgID(str(disp_clsid))
-    except pythoncom.com_error as error:
-        raise TypeError(error_msg) from error
-
-    if disp_class is None:
-        raise TypeError(error_msg)
     # Get the clsid
     clsid = disp_class.CLSID
     # Create a new class that derives from 2 classes:
@@ -333,7 +334,6 @@ class object that derives from three classes:
     >>> ie = DispatchWithEvents("InternetExplorer.Application", IEEvents)
     >>> ie.Visible = 1
     Visible changed: 1
-    >>>
     """
     disp, disp_class, events_class = __get_disp_and_event_classes(clsid)
     result_class = type(