Only multi-threaded DLL libraries can be used with Ice!

[chenhong_sz]

when i complie a project ,a error message shown:
"Only multi-threaded DLL libraries can be used with Ice!'
i found it defined as follow:
# if !defined(_DLL) || !defined(_MT)
# error "Only multi-threaded DLL libraries can be used with Ice!"
# endif
so i add _DLL,_MT in project->setting->c/c++->preprocessor definitions
and rebuild, it look ok,but i don't know what its meaning. if when the program use multi-thread, and user must set the _DLL and _MT?

[bernard]

This just means the Ice libraries are built with /MD (release) or /MDd (debug) and you should do the same (using the appropriate drop-down list or checkbox, not by adding definitions).

I also recommend you have a look at the Microsoft documentation, such as http://msdn.microsoft.com/library/de..._libraries.asp.

Cheers,
Bernard

[chenhong_sz]

thank you your recommend.
but now has a new question:
http://www.zeroc.com/vbulletin/showt...=&threadid=816
can you give me some advice?

[yrh79]

i encounter the same problem, that it said "Only multi-threaded DLL libraries can be used with Ice!"
so... does it mean that i have to setup my project as a DLL?
i want to test the program given in the manual, here is my source:

//===========================================
// Server.cpp : Definition of a console program's entry point
//
#include "stdafx.h"

#include <Ice/Ice.h>
#include <Printer.h>
using namespace std;
using namespace PrintSys;
class PrinterI : public Printer {
public:
	virtual void printString(const string & s,
		const Ice::Current &);
};

void
PrinterI::
printString(const string & s, const Ice::Current &)
{
	cout << s << endl;
}

int
main(int argc, char* argv[])
{
	int status = 0;
	Ice::CommunicatorPtr ic;
	try {
		ic = Ice::initialize(argc, argv);
		Ice::ObjectAdapterPtr adapter
			= ic->createObjectAdapterWithEndpoints(
			"SimplePrinterAdapter", "default -p 10000");
		Ice::ObjectPtr object = new PrinterI;
		adapter->add(object,
			Ice::stringToIdentity("SimplePrinter"));
		adapter->activate();
		ic->waitForShutdown();
	} catch (const Ice::Exception & e) {
		cerr << e << endl;
		status = 1;
	} catch (const char * msg) {
		cerr << msg << endl;
		status = 1;
	}
	if (ic) {
		try {
			ic->destroy();
		} catch (const Ice::Exception & e)
		{
			cerr << e << endl;
		}
		status = 1;
	}
	return status;
}

//============================================

// Client.cpp : Definition of a console program's entry point
//

#include "stdafx.h"

#include <Ice/Ice.h>
#include <Printer.h>
using namespace std;
using namespace PrintSys;

int
main(int argc, char * argv[])
{
	int status = 0;
	Ice::CommunicatorPtr ic;
	try {
		ic = Ice::initialize(argc, argv);
		Ice::ObjectPrx base = ic->stringToProxy(
			"SimplePrinter:default -p 10000");
		PrinterPrx printer = PrinterPrx::checkedCast(base);
		if (!printer)
			throw "Invalid proxy";
		printer->printString("Hello World!");
	} catch (const Ice::Exception & ex) {
		cerr << ex << endl;
		status = 1;
	} catch (const char * msg) {
		cerr << msg << endl;
		status = 1;
	}
	if (ic)
		ic->destroy();
	return status;
}
//======================

i set the project as "/MD"(multi-thread DLL), though my project was initaially a console program. despite of a few warnings, i get through the compile process, and then it wouldn't link.
the messages was:

Linking ...
Server.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl IceUtil::operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,class IceUtil::Exception const &)" (__imp_??6IceUtil@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV12@ABVException@0@@Z) ，it was referenced by function: __catch$_main$0

... many similar lines...

[benoit]

No this doesn't mean that you need to build your project as a multi-threaded DLL. You just need to ensure that you're compiling your console application with the right runtime library: either the debug (build with /MDd) or release (build with /MD) multi-threaded C runtime library. And you also need to link with the correct Ice library: ice.lib (for release) and iced.lib (for debug). It looks like from the error message that you're not linking you application with the Ice library.

Please take a look at the Visual C++ Ice demo projects for examples on how to setup a project.

Benoit.