[gadamopoulos] 73898: [UXTHEME] - When we set the desired app name and class name in SetWindowTheme we need to support empty strings meaning no themes for this window. Sort of support empty strings...

Author: gadamopoulos
Date: Sat Feb 25 09:23:37 2017
New Revision: 73898
URL: http://svn.reactos.org/svn/reactos?rev=73898&view=rev
Log:
[UXTHEME] - When we set the desired app name and class name in SetWindowTheme we need to
support empty strings meaning no themes for this window. Sort of support empty strings by
replacing them with a string containing a single "0". This works since there is
no app name or class name with this name. Also add some error messages.
Modified:
    trunk/reactos/dll/win32/uxtheme/system.c
Modified: trunk/reactos/dll/win32/uxtheme/system.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/win32/uxtheme/system.c…
==============================================================================
--- trunk/reactos/dll/win32/uxtheme/system.c    [iso-8859-1] (original)
+++ trunk/reactos/dll/win32/uxtheme/system.c    [iso-8859-1] Sat Feb 25 09:23:37 2017
@@ -667,14 +667,31 @@
 {
     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;