dynamic vbscript execution

Anandhan Sathyanarayanan 141

Hi,

My requirement is to execute the vbscript from C# (not from file). Followed the below article and tried to execute a simple statement WScript.Echo "Missing parameters but it's always giving syntax error as mentioned in the below article.

https://stackoverflow.com/questions/42632185/how-to-format-vbscript-string-executed-dynamically-through-c-sharp

Please guide to execute vbscript from C#

Timon Yang-MSFT 9,591 Reputation points

2021-01-21T06:50:45.663+00:00

@Anandhan Sathyanarayanan
Are you writing like this?
string sScript = "WScript.Echo \"Missing parameters\"";
Modify it to string sScript = "WScript.Echo'Missing parameters'"; then this error will disappear, but a new error will appear at the same time:
System.Runtime.InteropServices.COMException: 'Object required: 'WScript''
It seems that writing vbscript directly in c# has many limitations.
Why can't you write it to the file and then use the file?
Anandhan Sathyanarayanan 141 Reputation points

2021-01-21T16:51:48.177+00:00

@Timon Yang-MSFT

I'm able to execute the vbscript file without any error, but the requirement is to embed the vbscript in the executable file and execute.

Since the vbscript file is embedded i'm not able to execute it directly (Error: path not found)

Instead i'm reading the content of the file and executing it as dynamic script.

Accepted answer

Castorix31 85,881 Reputation points

2021-01-20T20:02:55.477+00:00
This test works fine for me =>

var scriptType = Type.GetTypeFromCLSID(Guid.Parse("0E59F1D5-1FBE-11D0-8FF2-00A0D10038BC")); dynamic objScriptControl = Activator.CreateInstance(scriptType); objScriptControl.Language = "vbscript"; string sScript = "function Myfunction()" + Environment.NewLine + "Dim Text, Button, Title, Result" + Environment.NewLine + "Text = \"Are you OK ?\"" + Environment.NewLine + "Button = vbYesNoCancel+ vbQuestion" + Environment.NewLine + "Title = \"Question\"" + Environment.NewLine + "Result = MsgBox(Text, Button, Title) " + Environment.NewLine + "end function" + Environment.NewLine; objScriptControl.AddCode(sScript); objScriptControl.Eval("Myfunction()");
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Anandhan Sathyanarayanan 141 Reputation points

2021-01-21T06:05:33.453+00:00

Thanks for the solution..

Is it possible to get the vb script execution output in C#? (like Process.StandardOutput & Process.StandardError)

This would be helpful to know the script execution status

Castorix31 85,881 Reputation points

2021-01-21T11:13:14.387+00:00

From this old MSDN article, event handlers can be added, but I never tested...

Anandhan Sathyanarayanan 141 Reputation points

2021-01-21T13:51:44.827+00:00

@Castorix31

Thanks for the update..

One more last question I'm getting the below error when i tried to execute WScript.S leep(5000)

System.Runtime.InteropServices.COMException HResult=0x800A01A8 Message=Object required: 'WScript' Source=System.Dynamic

I have also tried the below script, but it's also throwing the same Object Required error

set objShell = createObject("wscript.shell") objShell.S leep(5000)

Castorix31 85,881 Reputation points

2021-01-21T19:48:31.627+00:00

You can add objects as explained in this old VB KB : Q185697

A test => WScript Object
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