CONST_DDLOCKFLAGS

The CONST_DDLOCKFLAGS enumeration is used by the flags parameter of the DirectDrawSurface7.Lock and Direct3DVertexBuffer7.Lock methods to indicate how the lock is to be performed.

Enum CONST_DDLOCKFLAGS
    DDLOCK_DONOTWAIT    = 16384
    DDLOCK_EVENT         =    2
    DDLOCK_NOSYSLOCK     = 2048
    DDLOCK_READONLY      =   16
    DDLOCK_SURFACEMEMORYPTR = 0
    DDLOCK_WAIT          =    1
    DDLOCK_WRITEONLY     =   32
End Enum

DDLOCK_DONOTWAIT

The default is DDLOCK_WAIT. If you wish to override the default and use time when the accelerator is busy (as denoted by the DDERR_WASSTILLDRAWING error value). use DDLOCK_DONOTWAIT.

DDLOCK_EVENT

Not currently implemented.

DDLOCK_NOSYSLOCK

If possible, do not take the Win16Mutex (also known as Win16Lock). This flag is ignored when locking the primary surface.

DDLOCK_READONLY

The surface being locked is read-only.

DDLOCK_SURFACEMEMORYPTR

A valid memory pointer to the top of the specified rectangle should be returned. If no rectangle is specified, a pointer to the top of the surface is returned. This is the default.

DDLOCK_WAIT

If a lock cannot be obtained because a blit operation is in progress, the method retries until a lock is obtained or another error occurs, such as DDERR_SURFACEBUSY.

DDLOCK_WRITEONLY

The surface being locked is write-enabled.