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IDebugCustomViewer::DisplayValue

  • Artikkeli

Applies to: yesVisual Studio noVisual Studio for Mac

Note

This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here

This method is called to display the specified value.

Syntax

HRESULT DisplayValue(
   HWND             hwnd,
   DWORD            dwID,
   IUnknown *       pHostServices,
   IDebugProperty3* pDebugProperty);
);

int DisplayValue(
   IntPtr          hwnd,
   uint            dwID,
   object          pHostServices,
   IDebugProperty3 pDebugProperty
);

Parameters

hwnd
[in] Parent window

dwID
[in] ID for custom viewers that support more than one type.

pHostServices
[in] Reserved. Always set to null.

pDebugProperty
[in] Interface that can be used to retrieve the value to be displayed.

Return Value

If successful, returns S_OK; otherwise returns error code.

Remarks

The display is "modal" in that this method will create the necessary window, display the value, wait for input, and close the window, all before returning to the caller. This means the method must handle all aspects of displaying the property's value, from creating a window for output, to waiting for user input, to destroying the window.

To support changing the value on the given IDebugProperty3 object, you can use the SetValueAsStringWithError method —if the value can be expressed as a string. Otherwise, it is necessary to create a custom interface—exclusive to the expression evaluator implementing this DisplayValue method—on the same object that implements the IDebugProperty3 interface. This custom interface would supply methods for changing the data of an arbitrary size or complexity.

See also