IDCompositionDevice::CheckDeviceState method (dcomp.h)
Determines whether the DirectComposition device object is still valid.
Syntax
HRESULT CheckDeviceState(
[out] BOOL *pfValid
);
Parameters
[out] pfValid
TRUE if the DirectComposition device object is still valid; otherwise FALSE.
Return value
If the function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code. See DirectComposition Error Codes for a list of error codes.
Remarks
If the Microsoft DirectX Graphics Infrastructure (DXGI) device is lost, the DirectComposition device associated with the DXGI device is also lost. When it detects a lost device, DirectComposition sends the WM_PAINT message to all windows that are composing DirectComposition content using the lost device. An application should call CheckDeviceState in response to each WM_PAINT message to ensure that the DirectComposition device object is still valid. The application must take steps to recover content if the device object becomes invalid. Steps include creating new DXGI and DirectComposition devices, and recreating all content. (It’s not possible to create just a new DXGI device and associate it with the existing DirectComposition device.) The system ensures that the device object remains valid between WM_PAINT messages.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8 [desktop apps only] |
| Minimum supported server | Windows Server 2012 [desktop apps only] |
| Target Platform | Windows |
| Header | dcomp.h |
| Library | Dcomp.lib |
| DLL | Dcomp.dll |