New and improved banner:

- No more crashes
- Responds to messages (and thus redraws itself)
- Doesn't put the main window on the background
- Some new /set tricks by brainsucker


git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@2909 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/Banner/Banner.c

@@ -14,28 +14,75 @@
 
 HINSTANCE hInstance;
 HWND hwBanner;
+HANDLE hThread;
 
 char buf[1024];
 
 unsigned int myatoi(char *s);
 
-BOOL CALLBACK bannerProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
+BOOL CALLBACK BannerProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {
   if (uMsg == WM_INITDIALOG)
   {
+    int iMainStringSet = 0;
+
     popstring(buf);
-    while (*(int*)buf == CHAR4_TO_DWORD('/','s','e','t')) {
+    while (*(int*)buf == CHAR4_TO_DWORD('/','s','e','t') && !buf[4])
+    {
       unsigned int id;
       popstring(buf);
       id = myatoi(buf);
       popstring(buf);
-      SetDlgItemText(hwndDlg,id,buf);
+      SetDlgItemText(hwndDlg, id, buf);
       popstring(buf);
+
+      if (id == IDC_STR)
+        iMainStringSet++;
     }
-    SetWindowText(hwndDlg,buf);
-    SetDlgItemText(hwndDlg,IDC_STR,buf);
-    ShowWindow(hwndDlg,SW_SHOW);
+
+    SetWindowText(hwndDlg, buf);
+    if (!iMainStringSet)
+      SetDlgItemText(hwndDlg, IDC_STR, buf);
+
+    if (!*buf)
+      SetWindowLong(hwndDlg, GWL_EXSTYLE, GetWindowLong(hwndDlg, GWL_EXSTYLE) | WS_EX_TOOLWINDOW);
   }
+  if (uMsg == WM_CLOSE)
+  {
+    DestroyWindow(hwndDlg);
+  }
+  return 0;
+}
+
+DWORD WINAPI BannerThread(LPVOID lpParameter)
+{
+  HWND hwndParent = (HWND) lpParameter;
+  HWND lhwBanner;
+  MSG msg;
+  //BOOL bRet;
+
+  lhwBanner = CreateDialog(
+    GetModuleHandle(0),
+    MAKEINTRESOURCE(IDD_VERIFY),
+    hwndParent,
+    BannerProc
+  );
+
+  while (IsWindow(lhwBanner))
+  {
+    if (PeekMessage(&msg, lhwBanner, 0, 0, PM_REMOVE))
+    {
+      DispatchMessage(&msg);
+    }
+    else
+    {
+      hwBanner = lhwBanner;
+      WaitMessage();
+    }
+  }
+
+  hwBanner = NULL;
+
   return 0;
 }
 
@@ -43,21 +90,72 @@ void __declspec(dllexport) show(HWND hwndParent, int string_size, char *variable
 {
   EXDLL_INIT();
 
-  hwBanner = CreateDialog(
-    GetModuleHandle(0),
-    MAKEINTRESOURCE(IDD_VERIFY),
-    hwndParent,
-    bannerProc
-  );
+  {
+    DWORD dwThreadId;
+
+    hwBanner = NULL;
+
+    hThread = CreateThread(0, 0, BannerThread, (LPVOID) hwndParent, 0, &dwThreadId);
+
+    // wait for the window to initalize and for the stack operations to finish
+    while (hThread && !hwBanner)
+    {
+      Sleep(10);
+    }
+
+    CloseHandle(hThread);
+
+    ShowWindow(hwBanner, SW_SHOW);
+  }
 }
 
 void __declspec(dllexport) destroy(HWND hwndParent, int string_size, char *variables, stack_t **stacktop)
 {
-  DestroyWindow(hwBanner);
+  if (!hwBanner)
+    return;
+
+  PostMessage(hwBanner, WM_CLOSE, 0, 0);
+
+  if (!hwndParent)
+  {
+    // create a dummy window on the thread the NSIS window will be created on and set it
+    // as the foreground window so this thread will return to be the foreground window
+    HWND hwTemp;
+
+    AttachThreadInput(GetWindowThreadProcessId(hwndParent, 0), GetCurrentThreadId(), TRUE);
+
+    hwTemp = CreateWindowEx(
+      WS_EX_TOOLWINDOW,
+      "STATIC",
+      "",
+      WS_VISIBLE | WS_POPUP,
+      -1,
+      -1,
+      1,
+      1,
+      0,
+      0,
+      hInstance,
+      0
+    );
+    SetForegroundWindow(hwTemp);
+    DestroyWindow(hwTemp);
+
+    AttachThreadInput(GetWindowThreadProcessId(hwndParent, 0), GetCurrentThreadId(), FALSE);
+  }
+
+  // Wait for the thread to finish
+  while (hwBanner)
+    Sleep(25);
 }
 
 BOOL WINAPI _DllMainCRTStartup(HANDLE hInst, ULONG ul_reason_for_call, LPVOID lpReserved)
 {
+  hInstance = hInst;
+  if (hwBanner && ul_reason_for_call == DLL_PROCESS_DETACH)
+  {
+    destroy(0, 0, 0, 0);
+  }
 	return TRUE;
 }