Use a BSTR as string in C# COM method -


my project control device software working on. doing vendor provides com library. have problem calling 1 method library:

in (unfortunately shortly written) documentation of com library method have call defined this:

xclass *getdeviceinterface(bstr p_serialnumber)

but: visual studio tells me have put string method:

public virtual xclass getdeviceinterface(string p_serialnumber)

so able compile program if plug in device's serial number string , not bstr. test purposes calling method in if case (i check if returned).

intptr serialbstr = marshal.stringtobstr(serialno); if (obj1.getdeviceinterface(marshal.ptrtostringbstr(serialbstr)) != null)                     {                         messagebox.show("fine");                     }

but if invalidcastexception:

system.invalidcastexception: return argument has invalid type. @ system.runtime.remoting.proxies.realproxy.validatereturnarg(object arg, type paramtype) @ system.runtime.remoting.proxies.realproxy.propagateoutparameters(imessage msg, object[] outargs, object returnvalue) @ system.runtimetype.forwardcalltoinvokemember(string membername, bindingflags flags, object target, int32[] awrappertypes, messagedata& msgdata) @ theusedcomlib.class1.getinterface(string serialno) @ myproject.form1.initialize() in path/to/my/file.cs:line 00

i think work fine, if able compile bstr argument. can somehow trick compiling process? or ignore information (that says need string method) visual studio reads library?

thank help!


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