How to get or wait for the result code of an AT Command?

[jhayahywhy]

How can I get or wait for the result code of an AT Command without using the `Sleep()` function in PowerBuilder? I am using the MSComm OLE Control for PowerBuilder. Could I do a While Loop unti the `MSCOmm.Input` property returns the proper buffer?(e.g, `OK`) However, I tried this but the `Input` returns an empty string.

Here is my PB Code:

String numbers[]

    numbers[1] = "+639394854493"
    numbers[2] = "+639394854491"
    numbers[3] = "+639394854492"
    numbers[4] = "+639394854493"
    numbers[5] = "+639394854494"

    int cnt = 1 
    for cnt = 1 to 5
	    Sleep(0.5)
	    ole_1.object.Output = "AT" + Char(13) + Char(10)
	    Sleep(0.5)
	    ole_1.object.Output = "AT+CMGF=1" + Char(13) + Char(10)
	    Sleep(0.5)
	    ole_1.object.Output = "AT+CMGS=" + Char(34) + numbers[cnt] + Char(34) + Char(13) + Char(10)
	    Sleep(0.5)
	    ole_1.object.Output = sle_2.text + " - " + string(cnt) + Char(26)
    next

And here is the port settings:

ole_1.object.CommPort = 7
	ole_1.object.Settings = "115200,n,8,1"
	ole_1.object.RThreshold = 1
	ole_1.object.InputLen = 0
	ole_1.object.InputMode = 0
	ole_1.object.PortOpen = True

Any suggestions? Or am I doing something wrong?