Executing external programs

Sometimes it’s needed to add functionality not delivered by NAV. One way is to use .Net assemblies or automations. Another scenario can be to run an external program in C/AL. One way is to use the quite old SHELL Command or class WshShell of the “Windows Scripting Host” (automation). In both cases, when running an external program, a security warning is displayed … not so good for automatic execution (batch).

Class System.Diagnostics.Process from .Net assembly System.dll
To avoid that and to have also a much prettier solution, use the class System.Diagnostics.Process from the .Net Framework (search for assembly System.dll). For usage in RTC Client set the property RunOnClient to true, for usage on the server only like job queues set the value to false.

Sample: creating a file using the dir command in a dos shell

// variable process | dotnet | System.Diagnostics.Process (assembly System.dll)
process := process.Process;
process.StartInfo.UseShellExecute := FALSE;
process.StartInfo.FileName := ‘cmd.exe’;
process.StartInfo.Arguments := ‘/c dir > c:\temp\dir.txt’;
process.StartInfo.CreateNoWindow := TRUE;

sample: extract a rar file

process := process.Process;
process.StartInfo.UseShellExecute := FALSE;
process.StartInfo.FileName := ‘”C:\Program Files (x86)\WinRAR\unrar.exe”‘;
process.StartInfo.Arguments := ‘e -y -o+ c:\temp\archive.rar c:\temp’;
process.StartInfo.CreateNoWindow := TRUE;

Stop pending processes:
Use methods WaitForExit or Kill to stop pending processes.




2 thoughts on “Executing external programs

  1. Rihard says:

    Hi Jonathan,

    I wanted to recreate the code in my NAV installation but I can’t find the System.Diagnostics.Process .NET assembly. The assemblies that I see are System.Diagnostics.Contracts/Debug/Tools/Tracing. Am I missing something?


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