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Support case where win32socketserver's window class is not unregistered properly.

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Either from failure to shutdown or when instantiated in a dll that is loaded or
unloaded multiple times within a single process lifetime.

Change-Id: I52b05a6d84c9312fbd45aaa34ed3f49566daadfd
Bug: b/140961297
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/155987
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29574}
This commit is contained in:
Tim Haloun
2019-10-15 11:24:30 -07:00
committed by Commit Bot
parent 8c51f2e9cd
commit a043b2ba46
1 changed files with 19 additions and 23 deletions
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42
rtc_base/win32_window.cc
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@ -19,24 +19,16 @@ namespace rtc {
// Win32Window
///////////////////////////////////////////////////////////////////////////////
static const wchar_t kWindowBaseClassName[] = L"WindowBaseClass";
static const wchar_t kWindowBaseClassName[] = L"RtcWindowBaseClass";
HINSTANCE Win32Window::instance_ = nullptr;
ATOM Win32Window::window_class_ = 0;
Win32Window::Win32Window() : wnd_(nullptr) {}
Win32Window::~Win32Window() {
RTC_DCHECK(nullptr == wnd_);
}
Win32Window::~Win32Window() { RTC_DCHECK(nullptr == wnd_); }
bool Win32Window::Create(HWND parent,
const wchar_t* title,
DWORD style,
DWORD exstyle,
int x,
int y,
int cx,
int cy) {
bool Win32Window::Create(HWND parent, const wchar_t* title, DWORD style,
DWORD exstyle, int x, int y, int cx, int cy) {
if (wnd_) {
// Window already exists.
return false;
@ -51,8 +43,16 @@ bool Win32Window::Create(HWND parent,
return false;
}
// Class not registered, register it.
// Register or reregister the class as necessary. window_class_ == nullptr
// is not an infallible indicator that the class is unregistered.
WNDCLASSEXW wcex;
memset(&wcex, 0, sizeof(wcex));
wcex.cbSize = sizeof(wcex);
if (::GetClassInfoExW(instance_, kWindowBaseClassName, &wcex) &&
!::UnregisterClassW(kWindowBaseClassName, instance_)) {
RTC_LOG_GLE(LS_ERROR) << "UnregisterClass failed.";
}
memset(&wcex, 0, sizeof(wcex));
wcex.cbSize = sizeof(wcex);
wcex.hInstance = instance_;
@ -76,14 +76,14 @@ void Win32Window::Destroy() {
void Win32Window::Shutdown() {
if (window_class_) {
::UnregisterClass(MAKEINTATOM(window_class_), instance_);
if (!::UnregisterClass(MAKEINTATOM(window_class_), instance_)) {
RTC_LOG_GLE(LS_ERROR) << "UnregisterClass failed.";
}
window_class_ = 0;
}
}
bool Win32Window::OnMessage(UINT uMsg,
WPARAM wParam,
LPARAM lParam,
bool Win32Window::OnMessage(UINT uMsg, WPARAM wParam, LPARAM lParam,
LRESULT& result) {
switch (uMsg) {
case WM_CLOSE:
@ -96,17 +96,13 @@ bool Win32Window::OnMessage(UINT uMsg,
return false;
}
bool Win32Window::OnClose() {
return true;
}
bool Win32Window::OnClose() { return true; }
void Win32Window::OnNcDestroy() {
// Do nothing. }
}
LRESULT Win32Window::WndProc(HWND hwnd,
UINT uMsg,
WPARAM wParam,
LRESULT Win32Window::WndProc(HWND hwnd, UINT uMsg, WPARAM wParam,
LPARAM lParam) {
Win32Window* that =
reinterpret_cast<Win32Window*>(::GetWindowLongPtr(hwnd, GWLP_USERDATA));