是否想用VC ++ dll集成JAVA，有没有快速简便的方法? [英] Want to integarte JAVA with VC++ dlls is there any fast and easy way?

问题描述

我在JAVA中有一个应用程序，在VC ++中有一个具有很多DLL的应用程序.

我想要它们之间的进程间通信.

我想用VC ++ dll将JAVA集成在一起，有没有快速简便的方法.

在此先感谢
Nilesh

I have an application in JAVA and another in VC++ with lot of DLLs.

I want interprocess communication between them.

I Want to integarte JAVA with VC++ dlls is there any fast and easy way.

Thanks in advance
Nilesh

推荐答案

如果您有dll的代码，那么这里是一个解决方案...

1)在要使用的ur dll项目中创建头文件"abc.h".

2)在此头文件中，粘贴以下代码.

#include"jni.h"
/* abc类的标题*/

#ifndef _Included_abc
#define _Included_abc
#ifdef __cplusplus
extern"C" {
#endif
/*
*类别:abc
*方法:ConvertFile
*签名:(Ljava/lang/String; Ljava/lang/String; Ljava/lang/String; J)Z
*/
JNIEXPORT jboolean JNICALL Java_ttslmcci_ConvertXML_ConvertFile
(JNIEnv *，jobject，jstring，jstring，jstring，jlong​​)；

#ifdef __cplusplus
}
#endif
#endif

3)现在在dll项目cpp文件中#include"abc.h"

4)将以下代码粘贴到c#文件中，其中u #included abc.h文件

JNIEXPORT jboolean JNICALL Java_abc_ConvertFile
(JNIEnv * env，jobject，jstring jstrInputFile，jstring jstrOutputFile，jstring，jlong​​)
{
jboolean bRet = true; //检查


//将Java字符串转换为MFC字符串..
BSTR bstrInputFile;
BSTR bstrOutputFile;

//将jstring转换为C ++常量字符串
const unsigned short * strA =(env)-> GetStringChars(jstrInputFile，&bRet);
const unsigned short * strB =(env)-> GetStringChars(jstrOutputFile，&bRet);

//将C ++字符串转换为BSTR
bstrInputFile =(BSTR)strA;
bstrOutputFile =(BSTR)strB;


CXMLSL objXMLSL; //这是包含开始使用dll功能的方法的类
objXMLSL.ConvertFile(bstrInputFile，bstrOutputFile);
//ConvertFile是dll中的启动方法，需要调用


(env)-> ReleaseStringChars(jstrInputFile，strA); //释放jstring
(env)-> ReleaseStringChars(jstrOutputFile，strB); //释放jstring


return bRet;
}

If u have the code for the dlls then here is a solution......

1) Create a header file "abc.h" in the project of ur dll which u want to use.

2) In this header file, paste the following code.

#include "jni.h"
/* Header for class abc */

#ifndef _Included_abc
#define _Included_abc
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: abc
* Method: ConvertFile
* Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;J)Z
*/
JNIEXPORT jboolean JNICALL Java_ttslmcci_ConvertXML_ConvertFile
(JNIEnv *, jobject, jstring, jstring, jstring, jlong);

#ifdef __cplusplus
}
#endif
#endif

3) Now #include "abc.h" in the dll project cpp file

4) Paste the following code in the cpp file where u #included abc.h file

JNIEXPORT jboolean JNICALL Java_abc_ConvertFile
(JNIEnv *env, jobject, jstring jstrInputFile, jstring jstrOutputFile, jstring, jlong)
{
jboolean bRet = true; //check


// Convert Java string into MFC string ..
BSTR bstrInputFile;
BSTR bstrOutputFile;

// convert jstring to a C++ constant string
const unsigned short* strA = (env)->GetStringChars(jstrInputFile, &bRet);
const unsigned short* strB = (env)->GetStringChars(jstrOutputFile, &bRet);

// convert the C++ string to BSTR
bstrInputFile = (BSTR) strA;
bstrOutputFile = (BSTR) strB;


CXMLSL objXMLSL; // This is the class that contains the method to start using the functionality of the dll
objXMLSL.ConvertFile( bstrInputFile, bstrOutputFile);
// ConvertFile is the starting method that is in the dll, that needs to be called


(env)->ReleaseStringChars(jstrInputFile, strA); // release jstring
(env)->ReleaseStringChars(jstrOutputFile, strB); // release jstring


return bRet;
}

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