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Fixed windows events on 32-bit Windows

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When running on 32-bit Windows, DefWindowProc resolves to a function in ntdll.dll, but after the window is created the actual window proc is a function in user32.dll. We solve this by using our own custom default window proc and looking for that instead.

Fixes https://github.com/libsdl-org/SDL/issues/1442
This commit is contained in:
Sam Lantinga
2025-11-09 07:42:50 -08:00
parent 836dad75ae
commit a96664674f
3 changed files with 10 additions and 5 deletions
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7
src/video/windows/SDL_windowsevents.c
View File

@@ -2471,6 +2471,11 @@ LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
}
}
LRESULT CALLBACK WIN_DefWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
return CallWindowProc(DefWindowProc, hwnd, msg, wParam, lParam);
}
int WIN_WaitEventTimeout(SDL_VideoDevice *_this, Sint64 timeoutNS)
{
if (g_WindowsEnableMessageLoop) {
@@ -2754,7 +2759,7 @@ bool SDL_RegisterApp(const char *name, Uint32 style, void *hInst)
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.lpszClassName = SDL_Appname;
wcex.style = SDL_Appstyle;
wcex.lpfnWndProc = DefWindowProc;
wcex.lpfnWndProc = WIN_DefWindowProc;
wcex.hInstance = SDL_Instance;
#if !defined(SDL_PLATFORM_XBOXONE) && !defined(SDL_PLATFORM_XBOXSERIES)

4
src/video/windows/SDL_windowsevents.h
View File

@@ -28,8 +28,8 @@ extern Uint32 SDL_Appstyle;
extern HINSTANCE SDL_Instance;
extern LRESULT CALLBACK WIN_KeyboardHookProc(int nCode, WPARAM wParam, LPARAM lParam);
extern LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam,
LPARAM lParam);
extern LRESULT CALLBACK WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
extern LRESULT CALLBACK WIN_DefWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
extern void WIN_PollRawInput(SDL_VideoDevice *_this, Uint64 poll_start);
extern void WIN_CheckKeyboardAndMouseHotplug(SDL_VideoDevice *_this, bool initial_check);
extern void WIN_PumpEvents(SDL_VideoDevice *_this);

4
src/video/windows/SDL_windowswindow.c
View File

@@ -427,13 +427,13 @@ static bool SetupWindowData(SDL_VideoDevice *_this, SDL_Window *window, HWND hwn
// Set up the window proc function
#ifdef GWLP_WNDPROC
data->wndproc = (WNDPROC)GetWindowLongPtr(hwnd, GWLP_WNDPROC);
if (data->wndproc == DefWindowProc) {
if (data->wndproc == WIN_DefWindowProc) {
data->wndproc = NULL;
SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)WIN_WindowProc);
}
#else
data->wndproc = (WNDPROC)GetWindowLong(hwnd, GWL_WNDPROC);
if (data->wndproc == DefWindowProc) {
if (data->wndproc == WIN_DefWindowProc) {
data->wndproc = NULL;
SetWindowLong(hwnd, GWL_WNDPROC, (LONG_PTR)WIN_WindowProc);
}