DD_MAPMEMORYDATA structure (ddrawint.h)

The DD_MAPMEMORYDATA structure contains the information necessary to map or unmap a frame buffer into user-mode memory.

Syntax

typedef struct _DD_MAPMEMORYDATA {
  PDD_DIRECTDRAW_GLOBAL lpDD;
  BOOL                  bMap;
  HANDLE                hProcess;
  FLATPTR               fpProcess;
  HRESULT               ddRVal;
} *PDD_MAPMEMORYDATA, DD_MAPMEMORYDATA;

Members

lpDD

Points to a DD_DIRECTDRAW_GLOBAL structure that describes the driver's device.

bMap

Specifies the memory operation that the driver should perform. A value of TRUE indicates that the driver should map memory; FALSE means that the driver should unmap memory.

hProcess

Handle to the process whose address space is affected.

fpProcess

Specifies the ___location in which the driver should return the base address of the process's memory-mapped space when bMap is TRUE. When bMap is FALSE, fpProcess contains the base address of the memory to be unmapped by the driver.

ddRVal

Specifies the ___location in which the driver writes the return value of the DdMapMemory callback. A return code of DD_OK indicates success. For more information, see Return Values for DirectDraw.

Requirements

See also

DdMapMemory