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Java example source code file (invoker.cpp)

This example Java source code file (invoker.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

corbindtoruntimehost, couninitialize, failed, format_message_allocate_buffer, formatmessage, hresult, icorruntimehost-, java_invoker_invokeclr, jnicall, lptstr, lpvoid, makelangid, null, wchar

The invoker.cpp Java example source code

/*
 * Copyright (c) 2006, 2011, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */


#define _WIN32_WINNT 0x0400
#include "windows.h"
#include "Oleauto.h"
#include "stdio.h"
#include "mscoree.h"
#include "corerror.h"
#include "jni.h"
#include "invokerExp.h"
#include "invoker.h"

#import  <mscorlib.tlb> raw_interfaces_only

using namespace mscorlib;

// The CLR assembly invocation function

int __stdcall invokeCLR( WCHAR* wszApplication){

    //Initializes the COM library

    CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

    ICorRuntimeHost* pHost           = NULL;
    IUnknown*        pAppDomainThunk = NULL;
    _AppDomain*      pAppDomain      = NULL;
    long             lReturn         = 0;

    // Load CLR into the process

    HRESULT hr = CorBindToRuntimeEx(NULL,NULL,0,CLSID_CorRuntimeHost,IID_ICorRuntimeHost,(VOID**)&pHost);

    if(!FAILED(hr)) {

        // Start the CLR

        hr = pHost->Start();
        if(!FAILED(hr)) {

            // Get the _AppDomain interface

            hr = pHost->GetDefaultDomain(&pAppDomainThunk);
            if(!FAILED(hr)) {

                hr = pAppDomainThunk->QueryInterface(__uuidof(_AppDomain), (void**)&pAppDomain);
                if(!FAILED(hr)) {

                    // Execute assembly

                    hr = pAppDomain->ExecuteAssembly_2(_bstr_t(wszApplication), &lReturn);
                    if (FAILED(hr)) {

                        printf("_AppDomain::ExecuteAssembly_2 failed with hr=0x%x.\n", hr);
                        lReturn = -1;
                    }

                }else{
                    printf("Can't get System::_AppDomain interface\n");
                    lReturn = -2;
                }

            }else{
                printf("ICorRuntimeHost->GetDefaultDomain failed with hr=0x%x.\n", hr);
                lReturn = -3;
            }
        }else{
            printf("ICorRuntimeHost->Start failed with hr=0x%x.\n", hr);
            lReturn = -4;
        }

    }else{
        printf("CorBindToRuntimeHost failed with hr=0x%x.\n", hr);
        lReturn = -5;
    }

    // print the error message description if needed

    if(FAILED(hr)){
        LPVOID lpMsgBuf = NULL;

        FormatMessage(
                FORMAT_MESSAGE_ALLOCATE_BUFFER |
                FORMAT_MESSAGE_FROM_SYSTEM |
                FORMAT_MESSAGE_IGNORE_INSERTS,
                NULL,
                hr,
                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                (LPTSTR) &lpMsgBuf,
                0,
                NULL );
        if(lpMsgBuf != NULL)
            printf("Message:%s\n",lpMsgBuf);
        else
            printf("No translation of 0x%x\n",hr);
    }

    // close COM library

    CoUninitialize();

    return lReturn;
}

// Wrapper function that allows to ASCIZ string to provide the assemble path

int __stdcall invokeCLR( const char* szApplication){

    int    nLength = strlen(szApplication)+1;

    WCHAR* wszApplication = new WCHAR[nLength];

    mbstowcs(wszApplication, szApplication, nLength);

    int nReturn = invokeCLR( wszApplication);

    delete wszApplication;

    return nReturn;
}

// native method enter-point

JNIEXPORT jint JNICALL Java_invoker_invokeCLR( JNIEnv* pEnv,
                                               jclass  pClass,
                                               jstring jsApplication) {

    const char* szApplication = pEnv->GetStringUTFChars(jsApplication, NULL);

    int nResult = invokeCLR( szApplication);

    pEnv->ReleaseStringUTFChars(jsApplication,szApplication);

    return nResult;
}

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