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45 lines
1.9 KiB
Markdown
45 lines
1.9 KiB
Markdown
---
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title: "GetCustomUI"
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ms.date: "03/30/2017"
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helpviewer_keywords:
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- "custom error messages [WPF]"
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ms.assetid: e55180fc-35bb-4f80-a136-772b5eb3e4e5
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---
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# GetCustomUI
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Called by PresentationHost.exe to get custom progress and error messages from the host, if implemented.
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## Syntax
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```cpp
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HRESULT GetCustomUI( [out] BSTR* pwzProgressAssemblyName, [out] BSTR* pwzProgressClassName, [out] BSTR* pwzErrorAssemblyName, [out] BSTR* pwzErrorClassName );
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```
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## Parameters
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`pwzProgressAssemblyName`
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[out] A pointer to the assembly that contains the host-supplied progress user interface.
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`pwzProgressClassName`
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[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`.
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`pwzErrorAssemblyName`
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[out] A pointer to the assembly that contains the host-supplied error user interface.
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`pwzErrorClassName`
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[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`.
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## Property Value/Return Value
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HRESULT: Ignored.
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## Remarks
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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.
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This function is called once during PresentationHost’s initialization.
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## See also
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- [IWpfHostSupport](iwpfhostsupport.md)
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