Initial WPF content migrated (#17)

* Reset branch for WPF changes * Convert BMP to PNG; fix link-out-of-scope err * Add snippets for WPF... 6794 files!!!! * Add missing snippets * update file updated between migration * Fix paths to include * update breadcrumb and toc * fix index links * fix index links * fix index links * fix markdown
2026-09-05 23:42:58 +02:00 · 2020-09-04 09:46:28 -07:00
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+---
+title: "GetCustomUI"
+ms.date: "03/30/2017"
+helpviewer_keywords: 
+  - "custom error messages [WPF]"
+ms.assetid: e55180fc-35bb-4f80-a136-772b5eb3e4e5
+---
+# GetCustomUI
+Called by PresentationHost.exe to get custom progress and error messages from the host, if implemented.  
+  
+## Syntax  
+  
+```cpp  
+HRESULT GetCustomUI( [out] BSTR* pwzProgressAssemblyName, [out] BSTR* pwzProgressClassName, [out] BSTR* pwzErrorAssemblyName, [out] BSTR* pwzErrorClassName );  
+```  
+  
+## Parameters  
+ `pwzProgressAssemblyName`  
+  
+ [out] A pointer to the assembly that contains the host-supplied progress user interface.  
+  
+ `pwzProgressClassName`  
+  
+ [out] The name of the class that is the host-supplied progress user interface, preferably a XAML file with <xref:System.Windows.Controls.Page> is its top-level element. This class resides in the assembly that is specified by `pwzProgressAssemblyName`.  
+  
+ `pwzErrorAssemblyName`  
+  
+ [out] A pointer to the assembly that contains the host-supplied error user interface.  
+  
+ `pwzErrorClassName`  
+  
+ [out] The name of the class that is the host-supplied error user interface, preferably a XAML file with <xref:System.Windows.Controls.Page> is its top-level element. This class resides in the assembly that is specified by `pwzErrorAssemblyName`.  
+  
+## Property Value/Return Value  
+ HRESULT: Ignored.  
+  
+## Remarks  
+ A host application may have a specific theme that PresentationHost.exe’s default user interfaces may not conform to. If this is the case, the host application can implement [GetCustomUI](getcustomui.md) to return progress and error user interfaces to PresentationHost.exe. PresentationHost.exe will always call [GetCustomUI](getcustomui.md) before using its default user interfaces.  
+  
+ This function is called once during PresentationHost’s initialization.  
+  
+## See also
+
+- [IWpfHostSupport](iwpfhostsupport.md)