EngDeviceIoControl function (winddi.h)
The EngDeviceIoControl function sends a control code to the specified video miniport driver, causing the device to perform the specified operation.
Syntax
ENGAPI DWORD EngDeviceIoControl(
[in] HANDLE hDevice,
[in] DWORD dwIoControlCode,
[in, optional] LPVOID lpInBuffer,
[in] DWORD nInBufferSize,
[out, optional] LPVOID lpOutBuffer,
[in] DWORD nOutBufferSize,
[out] LPDWORD lpBytesReturned
);
Parameters
[in] hDevice
Handle to the device that is to perform the operation.
[in] dwIoControlCode
Specifies the control code for the operation. The I/O controls are listed and described in full in Video Miniport Driver I/O Control Codes.
[in, optional] lpInBuffer
Pointer to a buffer containing data required to perform the operation. This parameter can be NULL if the control code specifies an operation that does not require input data.
[in] nInBufferSize
Specifies the size, in bytes, of lpInBuffer.
[out, optional] lpOutBuffer
Pointer to a buffer in which the operation's output data is returned. This parameter can be NULL if the control code specifies an operation that does not produce output data.
[in] nOutBufferSize
Specifies the size, in bytes, of lpOutBuffer.
[out] lpBytesReturned
Pointer to a DWORD that specifies the actual size, in bytes, of the data returned in lpOutBuffer.
Return value
The return value is a 32-bit Win32 API-defined error code.
Remarks
EngDeviceIoControl is used by a display driver to communicate I/O requests to its corresponding miniport driver. This function provides the only communication channel between a display and video miniport driver.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating systems. |
| Target Platform | Universal |
| Header | winddi.h (include Winddi.h) |
| Library | Win32k.lib |
| DLL | Win32k.sys |