[UXTHEME] - When we set the desired app name and class name in SetWindowTheme we...

svn path=/trunk/; revision=73898

diff --git a/reactos/dll/win32/uxtheme/system.c b/reactos/dll/win32/uxtheme/system.c
index 9624b33..86fbc98 100644 (file)
--- a/reactos/dll/win32/uxtheme/system.c
+++ b/reactos/dll/win32/uxtheme/system.c
@@ -667,14 +667,31 @@ static HRESULT UXTHEME_SetWindowProperty(HWND hwnd, ATOM aProp, LPCWSTR pszValue
 {
     ATOM oldValue = (ATOM)(size_t)RemovePropW(hwnd, (LPCWSTR)MAKEINTATOM(aProp));
     if(oldValue)
+    {
         DeleteAtom(oldValue);
-    if(pszValue) {
-        ATOM atValue = AddAtomW(pszValue);
-        if(!atValue
-           || !SetPropW(hwnd, (LPCWSTR)MAKEINTATOM(aProp), (LPWSTR)MAKEINTATOM(atValue))) {
-            HRESULT hr = HRESULT_FROM_WIN32(GetLastError());
+    }
+
+    if(pszValue) 
+    {
+        ATOM atValue;
+
+        /* A string with zero lenght is not acceptatble in AddAtomW but we want to support
+           users passing an empty string meaning they want no theme for the specified window */
+        if(!pszValue[0])
+            pszValue = L"0";
+
+        atValue = AddAtomW(pszValue);
+        if (!atValue)
+        {
+            ERR("AddAtomW for %S failed with last error %d!\n", pszValue, GetLastError());
+            return HRESULT_FROM_WIN32(GetLastError());
+        }
+
+        if (!SetPropW(hwnd, (LPCWSTR)MAKEINTATOM(aProp), (LPWSTR)MAKEINTATOM(atValue)))
+        {
+            ERR("SetPropW for atom %d failed with last error %d\n", aProp, GetLastError());
             if(atValue) DeleteAtom(atValue);
-            return hr;
+            return HRESULT_FROM_WIN32(GetLastError());
         }
     }
     return S_OK;