Difference between revisions of "DosSelectSession"

Revision as of 14:24, 25 May 2018

DosSelectSession

Syntax

DosSelectSession ( ulIDSession )

Parameters

ulIDSession (ULONG) - input

The ID of the session to be switched to the foreground.

Returns

rc (APIRET) - return

0 NO_ERROR

224 ERROR_SMG_NO_TARGET_WINDOW

369 ERROR_SMG_INVALID_SESSION_ID

418 ERROR_SMG_INVALID_CALL

459 ERROR_SMG_BAD_RESERVE

460 ERROR_SMG_PROCESS_NOT_PARENT

463 ERROR_SMG_RETRY_SUB_ALLOC

Usage Explanation

DosSelectSession lets a parent session switch one of its child sessions or itself to the foreground, no grandchild session or any other descendant beyond a child session can be selected. The child process will not be brought to the foreground unless the parent session or one of its descendant sessions is currently executing in the foreground. For windowed applications is the application that owns the window focus the foreground session. It is only possible to issue DosSelectSession on sessions started by the current session with DosStartSession, with Related set to SSF_RELATED_CHILD (=1).

Sample Code

#define INCL_DOSSESMGR
#include <os2.h>

ULONG ulIDSession; 

/* Start a child session with DosStartSession */
/* psd->Related=SSF_RELATED_CHILD; */
/* DosStartSession(psd,&ulIDSession,..); */ 

if(DosSelectSession(ulIDSession)) /* Switch child session to foreground */
{
    /* Problems */
}
else
{
    /* The child session is now in the foreground */
}

See Also

• DosStartSession
• DosStopSession
• DosSetSession