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DrvQueryDriverInfo function (winddi.h)

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The DrvQueryDriverInfo function returns requested driver-specific information.

Syntax

BOOL DrvQueryDriverInfo(
        DWORD  dwMode,
  [out] PVOID  pBuffer,
        DWORD  cbBuf,
  [out] PDWORD pcbNeeded
);

Parameters

dwMode

Caller-supplied constant value, as indicated in the following table.

Value Definition
DRVQUERY_USERMODE The caller is querying whether the driver executes in user mode or in kernel mode.

[out] pBuffer

Caller-supplied pointer to a buffer to receive requested information. The function must supply the following information:

dwMode Value pBuffer Size Value supplied by DrvQueryDriverInfo
DRVQUERY_USERMODE One DWORD TRUE if driver executes in user mode; FALSE otherwise.

cbBuf

Caller-supplied value representing the size, in bytes, of the buffer pointed to by pBuffer.

[out] pcbNeeded

Caller-supplied pointer to a location to receive the minimum buffer size, in bytes, required to contain the requested information.

Return value

If the operation succeeds, the function should return TRUE; otherwise it should return FALSE.

Remarks

Printer graphics DLLs that execute in user mode must export a DrvQueryDriverInfo function. If the function is not exported, the local print provider assumes the graphics DLL executes in kernel mode.

Requirements

Requirement Value
Target Platform Desktop
Header winddi.h (include Winddi.h)