CODEWITHSUNDEEP
javac++java-native-interface
edelibas
edelibas

Reputation: 31

Calling unmanaged C++ via Java

I needed a Java application to call unmanaged C++. I copied MSVCR90.dll manually from Visual Studio 2008 redist path to the vmware's Windows Server Datacenter.

This is the error I get:

A fatal error has been detected by the Java Runtime Environment:

  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x73b4ae7a, pid=1108, tid=2272

 JRE version: 6.0_38-b05
 Java VM: Java HotSpot(TM) Client VM (20.13-b02 mixed mode, sharing windows-x86 )
 Problematic frame:
 C  [MSVCR90.dll+0x3ae7a]

 An error report file with more information is saved as:
 ...\hs_err_pid1108.log

 If you would like to submit a bug report, please visit:
 http://java.sun.com/webapps/bugreport/crash.jsp
 The crash happened outside the Java Virtual Machine in native code.
 See problematic frame for where to report the bug.

This is the C++ code:

 #include "stdafx.h"

 #include <stdio.h>

 #include "CCCheckString.h"

 #include <vector>

 #include <String>

 using namespace std;
 #include "jobHandler.h"

JNIEXPORT jbolean JNICALL Java_CCCheckString_Login
  (JNIEnv *env, jobject object, jstring host, jstring UserName, jstring Domain, jstring Password)
{
    bool result;

    jobHandler *handler = new jobHandler(); 

     const char *hostStr = (env)->GetStringUTFChars(host, NULL);
     string hostS(hostStr);
     const char *UserNameStr = (env)->GetStringUTFChars(UserName, NULL);
     string UserNameS(UserNameStr);
     const char *DomainStr = (env)->GetStringUTFChars(Domain, NULL);
     string DomainS(DomainStr);
     const char *PasswordStr = (env)->GetStringUTFChars(Password, NULL);
     string PasswordS(PasswordStr); 

         //if comment this line everthing is okey 
     **result = handler->Login(hostS,UserNameS,DomainS,PasswordS);**

    (env)->ReleaseStringUTFChars(host, NULL);
    (env)->ReleaseStringUTFChars(UserName, NULL);
    (env)->ReleaseStringUTFChars(Domain, NULL);
    (env)->ReleaseStringUTFChars(Password, NULL);


    delete handler;

    return result;

}

Below is the processing code in Java: 

CCCheckString ccCheckString = new CCCheckString();

 result=ccCheckString.Login("xxx", "xxx", "xx", "xxx");

How can i fix the error?

Upvotes: 2

Views: 519

Answers (1)

edelibas
edelibas

Reputation: 31

I solved.

Problem is that Login() accepts std::string but we cannot send it

We reorganize our Login() and it must take const char []

Ex: 

bool ClassName::Login(std::string host,std::string userName,std::string userDomain,std::string userPassword)
{ //Orginal Code Here ....}

bool ClassName::Login(const char host[],const char userName[],const char userDomain[],const char userPassword[])
{
std::string strHost(host);
std::string strUserName(userName);
std::string strUserDomain(userDomain);
std::string strUserPassword(userPassword);
return Login(strHost,strUserName,strUserDomain,strUserPassword);

}

Everything is fine.

Upvotes: 1

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