COM interoperability with Matlab 7 in C#
If you try to import Matlab 7.0’s com object into C#, you get this error when you try to call it using early binding.
MLApp.MLAppClass MyMatlab = new MLApp.MLAppClass();
textBox1.Text = MyMatlab.Execute("version");
results in:
An unhandled exception of type ‘System.InvalidCastException’ occurred
in Test version7.exe
Additional information: QueryInterface for interface MLApp.DIMLApp
failed.
This is apparently due to a mix up with GUID’s for mlapp.tlb, so, instead of hacking with the registry to correct their GUID, you can alternatively use late binding on the object thus;
Type objFactoryType;
objFactoryType = Type.GetTypeFromProgID("Matlab.Application");
object objFactory;
objFactory = Activator.CreateInstance(objFactoryType);
object[] args = new object[1];
args[0]="version";
object retval;
retval = objFactoryType.InvokeMember("Execute",BindingFlags.InvokeMethod,null,
objFactory,args);
MessageBox.Show(retval.ToString());
Which works fine…
