🚀 go-pugleaf

Subject: JNI and Windows 2000

I�m developing a program in which the C++ code must INVOKE a java method, with the following specifications:

Platform: Windows 2000
Application for C++: MS VC++ 6.0
Application for Java: Borland Jbuilder 4.0.

The description of problem and what I made:
-	I have set the CLASSPATH properly to the folder in which my classes exist.
-	I have written the java and C++ code in the end of this mail.
-	First, The Creation of JavaVM did NOT succeeded in the way that SUN is providing in the javasoft site. I have took the method for this from a guy that submitted the solution (this includes loading of jvm.dll first, and this is NOT mentioned in ALL SUN documents)
-	Second, after the Creation of JVM succeeded, the program can NOT find MY class file (Prog.class) although I copied the file in the same folder in which the C++ application is running, and I updated THE CLASSPATH VARABLE, WHICH IT SEEMS TO NOT WORKING WELL ON WINDOWS 2000 , and again NO DOCUMENTS is written about the variable CLASSPATH and Windows 2000.
-	PLEASE HELP ME IT IS URGENT.. THANK YOU VERY MUCH.
-	Here is the Java code:
//===============================================
public class Prog {
 public static void main(String[] args) {
  System.out.println("Hello World" + args[0]);
 }
}
//===============================================

-	Here is the C++ code with must call the main method in the java code above:
//===============================================
#include "jni.h"
#include <afxwin.h>

#ifdef _WIN32
#define PATH_SEPARATOR ';'
#else /* UNIX */
#define PATH_SEPARATOR ':'
#endif

#define USER_CLASSPATH "." /* where Prog.class is */

main() {
    JNIEnv *env;
    JavaVM *jvm;
    JDK1_1InitArgs vm_args;
    jint res;
    jclass cls;
    jmethodID mid;
    jstring jstr;
    jobjectArray args;
    char classpath[1024];


	jint ( JNICALL *JNI_CreateJavaVM)(JavaVM **pvm, void **penv, void *args); 
	jint (JNICALL *AttachCurrentThread)(JavaVM *vm, void **penv, void *args);
	jclass (JNICALL *FindClass)(JNIEnv *env, const char *name);

    /* IMPORTANT: specify vm_args version # if you use JDK1.1.2 and beyond */
    vm_args.version = JNI_VERSION_1_2;//0x00010001;

    //JNI_GetDefaultJavaVMInitArgs(&vm_args);


	HINSTANCE jvmDll= (HINSTANCE)NULL; 
	jvmDll = LoadLibrary("C:\\jdk1.3.0_02\\jre\\bin\\classic\\jvm.dll"); 

	if( jvmDll == NULL ) 
	{ 
	printf( "Problem loading VM library"); 
	} 

	// Get the .DLL function address of JNI_CreateJavaVM
	 JNI_CreateJavaVM = (jint (JNICALL *)(JavaVM **, void **, void* ) ) GetProcAddress( jvmDll, "JNI_CreateJavaVM" ); 

	if( !JNI_CreateJavaVM ) 
	{ 
	printf( "Could not find the JNI_CreateJavaVM function in the specified .DLL") ;
	} 




	vm_args.classpath = ".;D:\\JNIPrograms\\prog";
    /* Append USER_CLASSPATH to the end of default system class path */
    //sprintf(classpath, "%s;.",
    //        vm_args.classpath);
    //vm_args.classpath = classpath;

    /* Create the Java VM */
    res = JNI_CreateJavaVM(&jvm,(void**)&env,&vm_args);
    if (res < 0) {
        fprintf(stderr, "Can't create Java VM\n");
        exit(1);
    }

    cls = env->FindClass("Prog");
    if (cls == 0) {
        fprintf(stderr, "Can't find Prog class\n");
        exit(1);
    }
 
    mid = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");
    if (mid == 0) {
        fprintf(stderr, "Can't find Prog.MAIN\n");
        exit(1);
    }

    jstr = env->NewStringUTF(" from C!");
    if (jstr == 0) {
        fprintf(stderr, "Out of memory\n");
        exit(1);
    }
    args = env->NewObjectArray(1, 
                        env->FindClass("java/lang/String"), jstr);
    if (args == 0) {
        fprintf(stderr, "Out of memory\n");
        exit(1);
    }
    env->CallStaticVoidMethod(cls, mid, args);

    jvm->DestroyJavaVM();
}
//===============================================