David, Quick reply :) That pointed me in the right direction. The documentation I was reading indicated the use of GetWindowLongPtr, but at compile time (if one were writing C/C++ code) which particular version (Long/64, or 32 bit) is chosen. That's where I was getting mixed up - thanks!
Henry On Jan 11, 2008 9:33 PM, David Wahler <[EMAIL PROTECTED]> wrote: > On Jan 11, 2008 9:14 PM, Henry Baxter <[EMAIL PROTECTED]> wrote: > > Hello, > > > > I have been happily using ctypes for a while to do win32 programming. I > use the Microsoft documentation to understand the function, then call it > with the help of ctypes. > > > > The problem is that the docs says user32.dll has GetWindowLongPtr, but > ctypes can't find it using windll.user32.GetWindowLongPtrA or > windll.user32.GetWindowLongPtrW or windll.user32.GetWindowLongPtr. Errors > look like this: > > > > Traceback (most recent call last): > > File "Z:\experiments\windowsapp3.py", line 106, in <module> > > GetWindowLongPtr = windll.user32.GetWindowLongPtrA > > File "C:\Python25\lib\ctypes\__init__.py", line 353, in __getattr__ > > func = self.__getitem__(name) > > File "C:\Python25\lib\ctypes\__init__.py", line 358, in __getitem__ > > func = self._FuncPtr((name_or_ordinal, self)) > > AttributeError: function 'GetWindowLongPtrA' not found > > > > I have the same problem with the SetWindowLongPtr function. > > > > I can use plenty of other functions (GetParent, CreateWindowExA, > DefWindowProcA, and etc) but not these ones. > > > > > > I don't understand what goes on with ctypes under the hood really, so my > troubleshooting abilities at this point are quite lacking! I would > appreciate any help you could offer. > > > > > > Thanks! > > I don't have a copy of the official Win32 headers handy, but the MinGW > version of winuser.h contains this section of code: > > WINUSERAPI LONG WINAPI GetWindowLongA(HWND,int); > WINUSERAPI LONG WINAPI GetWindowLongW(HWND,int); > #ifdef _WIN64 > WINUSERAPI LONG_PTR WINAPI GetWindowLongPtrA(HWND,int); > WINUSERAPI LONG_PTR WINAPI GetWindowLongPtrW(HWND,int); > #else > #define GetWindowLongPtrA GetWindowLongA > #define GetWindowLongPtrW GetWindowLongW > #endif > > which I would take to mean you need to use GetWindowLong on 32-bit > windows, and GetWindowLongPtr on 64-bit windows. > > -- David >
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