Dont want to hard code the -Djava.class.path...notation question

Question

Hello everyone,
I have a c++ program that is compiled into a DLL file. It calls the JNI_CreateJavaVM. I have the whole thing working but now I need to port it and the jar file to another machine.
right now i am setting the options this way:
#define USER_CLASSPATH "c:\\javaClasses\\intec.jar.zip" /* where PRLocalBridge.class is */
#define PRCLASS "com/intec/intecapi/PRLocalBridge"
bool PRLocalBridgeMain(){
     JavaVMOption options[1];
     options[0].optionString = "-Djava.class.path=" USER_CLASSPATH;
     vm_args.version = JNI_VERSION_1_4;//0x00010002;
     vm_args.options = options;
     vm_args.nOptions = 0;
     vm_args.ignoreUnrecognized = JNI_TRUE;
    /* Create the Java VM */
    res = JNI_CreateJavaVM(&jvm, (void**)&env,&vm_args);
    if (res < 0) {
     return (bool*)errorHandler('b', CANT_INVOKE_JVM);
    cls = env->FindClass(PRCLASS);
}where USER_CLASSPATH is hardcoded directly to where the jar
file is located. in other machines, it may not be loaded
in that file structure. how do i softcode the path?
ive put the jar in my classpath but that doesnt seem to work
(unless i didnt have USER_CLASSPATH set properly). Thanks
in advance :)
txjump

Answer 1

hi bschauwe,
thanks for the suggestions! i was hoping you would reply. You have helped some others with classpath questions. :)
since its a dll, can you pass it values?
we do have an ini file that is already created but the file parser is in java so i would have to write another one in c. id like to stay away from that though. cause if it gets messed up or goes missing, clients wont be able to reach the java program, and in turn the database.
the classpath environment variable sounds like a good idea...will check into that. eventually we plan to wrap our software up in installshield so that would really be nice. clients could be ignorant of environment variables and still be able to run everything.
my solution for now has been to find my jar file by recursively searching the c drive. and use GetFilePath() to get the full path and pass that to JNI_CreateJavaVM. i did get it to work...just wondering if this is a good idea.
i was thinking that if the dll is in the same folder as the jar file i could just use dot notation but that just doesnt seem like a good idea to make that assumption. but i think java does something similar 'cause Sun says not to move the java.dll file.
thanks for your input,
txjump