我尝试再次创建新项目。
所以这里是JNISample2.java文件,该文件由JAVAH -classpath产生
public class JNISample2
{
static
{
System.loadLibrary("JNISample2Dll");
}
public native void displayHelloWorld();
public static void main(String[] args)
{
System.out.println("from java Hello");
JNISample2 JNIsample2;
JNIsample2 = new JNISample2();
JNIsample2.displayHelloWorld();
}
}
这里.h文件中。 JNISample2
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class JNISample2 */
#ifndef _Included_JNISample2
#define _Included_JNISample2
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: JNISample2
* Method: displayHelloWorld
* Signature:()V
*/
JNIEXPORT void JNICALL Java_JNISample2_displayHelloWorld
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif
这是我的.h文件的dll,我创建VS2005与MFC应用程序。
// JNISample2Dll.h : main header file for the JNISample2Dll DLL
//
#pragma once
#ifndef __AFXWIN_H__
#error "include 'stdafx.h' before including this file for PCH"
#endif
#include "resource.h" // main symbols
#include "JNISample2.h"
// CJNISample2DllApp
// See JNISample2Dll.cpp for the implementation of this class
//
class CJNISample2DllApp : public CWinApp
{
public:
CJNISample2DllApp();
// Overrides
public:
virtual BOOL InitInstance();
DECLARE_MESSAGE_MAP()
};
JNIEXPORT void JNICALL Java_JNISample2_displayHelloWorld(JNIEnv *, jobject);
这里是我的.cpp文件
// JNISample2Dll.cpp : Defines the initialization routines for the DLL.
//
#include "stdafx.h"
#include "JNISample2Dll.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
//
//TODO: If this DLL is dynamically linked against the MFC DLLs,
// any functions exported from this DLL which call into
// MFC must have the AFX_MANAGE_STATE macro added at the
// very beginning of the function.
//
// For example:
//
// extern "C" BOOL PASCAL EXPORT ExportedFunction()
// {
// AFX_MANAGE_STATE(AfxGetStaticModuleState());
// // normal function body here
// }
//
// It is very important that this macro appear in each
// function, prior to any calls into MFC. This means that
// it must appear as the first statement within the
// function, even before any object variable declarations
// as their constructors may generate calls into the MFC
// DLL.
//
// Please see MFC Technical Notes 33 and 58 for additional
// details.
//
// CJNISample2DllApp
BEGIN_MESSAGE_MAP(CJNISample2DllApp, CWinApp)
END_MESSAGE_MAP()
// CJNISample2DllApp construction
CJNISample2DllApp::CJNISample2DllApp()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}
// The one and only CJNISample2DllApp object
CJNISample2DllApp theApp;
// CJNISample2DllApp initialization
BOOL CJNISample2DllApp::InitInstance()
{
CWinApp::InitInstance();
return TRUE;
}
JNIEXPORT void JNICALL Java_JNISample2_displayHelloWorld(JNIEnv *, jobject)
{
MessageBox(NULL, TEXT("In JNISample2Dll"), TEXT("DLL"), 1);
}
我使用命令提示符下运行后:JAVA JNISample2,它显示“从Java你好”的字符串,但怎么就不会显示消息框我把它放在.cpp DLL文件中?
感谢您的回复。我终于得到它的链接,但我的C DLL中的功能不显示。也许我弄错了函数签名。 – phillip 2010-01-28 18:31:58
如果你的函数签名是错误的,那么从Java调用该函数应该会引发异常。如果没有异常被抛出,但是你的输出仍然没有出现,那么其他的东西是错误的。 – JesperE 2010-01-29 08:53:17