Checking the return code from an application executed

Question

I want to be able to check the return code from an application that is executed.

I tried implement it by the PowerBuilder function Run, but its not return the code of application which executed.

Thanks.

Answer 1

In fact, Run() launches the target synchronously, so by the time the next line of PowerScript runs, your Run() app may not be finished, let alone have a return code available. You need to make the Windows API calls with appropriate parameters yourself to achieve this, instead of relying on the PowerScript wrapper, which only gives you the synchronous option.

The following is what I have to launch a DOS command and get the return value. You may or may not need to tweak the parameters to the API calls as appropriate. The API calls are assuming a Unicode version of PowerBuilder, i.e. 10.0 or later.

External Function Prototypes

FUNCTION boolean CreateProcess(string AppName, string CommLine, long l1, long l2, boolean binh, long creationflags, long l3, string dir, str_startupinfo startupinfo, ref str_processinformation pi ) library 'kernel32.dll' alias for "CreateProcessW"
FUNCTION long WaitForSingleObject ( ulong ul_Notification, long lmillisecs ) library "kernel32.dll"
FUNCTION long GetExitCodeProcess(ulong hProcess,ref ulong lpExitCode) LIBRARY "kernel32.dll"
FUNCTION boolean CloseHandle(ulong h) library 'kernel32.dll'


ObjectStructure str_startupinfo

    ulong       cb
    string      lpreserved
    string      lpdesktop
    string      lptitle
    ulong       dwx
    ulong       dwy
    ulong       dwxsize
    ulong       dwysize
    ulong       dwxcountchars
    ulong       dwycountchars
    ulong       dwfillattribute
    ulong       dwflags
    uint        wshowwindow
    uint        cbreserved2
    string      lpreserved2
    uint        hstdinput
    uint        hstdoutput
    uint        hstderror

ObjectStructure str_processinformation

    unsignedlong        hprocess
    unsignedlong        hthread
    long        dwprocessid
    long        dwthreadid

function of_runandwait (string as_command, boolean ab_Visible) returns ulong

constant long STARTF_USESHOWWINDOW = 1
constant long CREATE_NEW_CONSOLE = 16
constant long NORMAL_PRIORITY_CLASS = 32
constant long INFINITE = -1
boolean lb_Return
long ll_Null, ll_CreationFlags, ll_Return
ulong lul_ProcessReturn
string ls_CurDir, ls_Null
str_StartupInfo lstr_Start
str_Processinformation lstr_PI

SetNull(ll_Null)
SetNull(ls_Null)
SetNull(ls_CurDir)

lstr_Start.cb                = 72
lstr_Start.dwFlags       = STARTF_USESHOWWINDOW
IF ab_Visible THEN
    lstr_Start.wShowWindow   = 1
ELSE
    lstr_Start.wShowWindow   = 0
END IF

ll_CreationFlags = CREATE_NEW_CONSOLE + NORMAL_PRIORITY_CLASS

lb_Return = CreateProcess (ls_Null, as_Command, ll_Null, ll_Null, FALSE, ll_CreationFlags, ll_Null, ls_CurDir, lstr_Start, lstr_PI)
ll_Return = WaitForSingleObject (lstr_PI.hProcess, INFINITE)
ll_Return = GetExitCodeProcess (lstr_PI.hProcess, lul_ProcessReturn)
CloseHandle(lstr_PI.hProcess)
CloseHandle(lstr_PI.hThread)

RETURN lul_ProcessReturn

Good luck,

Terry.