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How to Call an AS400 .dtf script from visual basic

Posted on 2001-06-12
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Last Modified: 2013-11-25
I need to call a .dtf script, generated by the AS400 Client Express tool, from Visual basic.  I realize I can shell it, but I want to handle any error codes returned from this call.

I looked at the Client Express toolkit, but I could not find anything about how to do this...
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Question by:ScottTiger
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Expert Comment

by:uschmitz
ID: 6184189
I am not familiar with ".dtf script" but I do use IBM Client Access Express (V4R5M0) every day to access an AS/400 from Visual Basic. I can offer advice regarding how to use ADO via Client Access Express.
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Author Comment

by:ScottTiger
ID: 6185933
Can you give me some examples, how I can pull a file as400 and store it as a comma delimited file on the nt file system?  

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Accepted Solution

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uschmitz earned 200 total points
ID: 6188981
Set up a system DSN (Data Source Name). Use Start | Settings | Control Panel ODBC Data Sources. In the ODBC Data Source Administrator select the System DSN tab. Click the Add button and select the Client Access Express Driver. Once created, you can use the DSN to access the AS/400 from Visual Basic.

Work with your AS/400 support to ensure that on the AS/400 the QSERVER subsystem and, specifically the QZDASOINIT job, are running and properly configured. QSERVER and QZDASOINIT must be running to support ODBC calls over TCP/IP to the AS/400. (I believe they are initialized during the IPL--initial program load--by default.)

In Visual Basic set a reference to the Microsoft ActiveX Data Objects Library. Use the following code snippet as a sample (substitute the System DSN name you created for "dsnname"):

Dim conAS400 As ADODB.Connection
Dim cmdGetData As ADODB.Command
Dim rstData As ADODB.Recordset

Set conAS400=New ADODB.Connection
With conAS400
    .Provider="MSDASQL"
    .ConnectionString="DSN=dsnname;"
End With

Set cmdGetData=New ADODB.Command
With cmdGetData
    Set .ActiveConnection=conAS400
    .CommandText="SELECT field, field FROM table"
    .CommandType=adCmdText
    Set rstData=.Execute
End With

(The .Provider MSDASQL specifies a DSN-based connection.)

Since setting up stored procedures on the AS/400 is quite involved, .CommandText must always be a valid SQL command for DB2/400.

Once you have an ADO Recordset, you can use the Recordset .GetString method to write the data to a file. .GetString is used as follows to generate a comma-delimited string with each record on one line an Null fields represented as "(Null)":

rstData.GetString(adClipString, , ",", vbNewLine, "(Null)")
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ID: 6911667
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