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Call viFindRsrc(defrm, "USB?*", list, nmatches, matches)

' Turn on the instrument

Call viOpen(defrm, matches, 0, 0, vi)

' Send a command to query the status of CH1

Call viVPrintf(vi, ":CHAN1:DISP?" + Chr$(10), 0)

' Obtain the status of CH1

Call viVScanf(vi, "%t", strRes)

s32Disp = CInt(strRes)

If (s32Disp = 1) Then

' Send the setting command

Call viVPrintf(vi, ":CHAN1:DISP 0" + Chr$(10), 0)

Label1(0).ForeColor = &H808080 ''Gray

Else

Call viVPrintf(vi, ":CHAN1:DISP 1" + Chr$(10), 0)

Label1(0).ForeColor = &HFFFF& 'Yellow

End If

' Close the resource

Call viClose(vi)

Call viClose(defrm)

6. Results

a. Click CH1 to turn on CH1 and the label above CH1 turns yellow;

b. Click CH2 to turn on CH2 and the label above CH2 turns blue;

c. Click CH3 to turn on CH3 and the label above CH3 turns rosy.

The results are as shown in the figure below.

5.4 VisualC++ Programming Example

Program used in this example:Visual C++6.0

Function realized in this example:search for the instrument address, connect to the

instrument, send commands, and read return values.

Enter the Visual C++6.0 programming environment, and perform the following

procedures.

1. Create a MFC project based on a dialog box.

2. Click Project > Settings to open the Project Setting dialog box. In the dialog box,

click the C/C++ tab, select Code Generation from the drop-down list under

Programming Examples

132

Rigol DP2000 Series Programming Guide

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