Problem with FindClass(...)!Thanks in advance!

Question

hi,everyone,I encounted problem in JNI program.
I programed a application program with Jbuilder.Now I want to do its interface.So I decide to use JNI.
The following is my C++ programming:
#include "memory.h"
#include "stdio.h"
#include "afxwin.h"
#ifdef _WIN32
#define PATH_SEPARATOR ';'
#else
#define PATH_SEPARATOR ':'
#endif
typedef jint (JNICALL CreateJavaVM_t)(JavaVM **pvm, void **env, void *args);
int main()
     JavaVMOption options[1];
     JNIEnv *env;
     JavaVM *jvm;
     JavaVMInitArgs vm_args;
     long status;
     jclass cls;
     jmethodID mid;
     jboolean not;
     HINSTANCE jvmDll=(HINSTANCE)NULL;
     CreateJavaVM_t *CreateJavaVM;
     /* Load the Java VM DLL */
if ((jvmDll = LoadLibrary("d:\\j2sdk1.4.0\\jre\\bin\\client\\jvm.dll")) == NULL)
printf("Error:cannot loading JVM");
return NULL;
/* Now get the function addresses */
CreateJavaVM = (CreateJavaVM_t *)GetProcAddress(jvmDll, "JNI_CreateJavaVM");
if (CreateJavaVM == NULL)
printf("Error: can't find JNI interfaces\n");
return NULL;
     options[0].optionString = "-Djava.class.path=.";
     memset(&vm_args, 0, sizeof(vm_args));
     vm_args.version =JNI_VERSION_1_2;
     vm_args.nOptions = 1;
     vm_args.options = options;
     vm_args.ignoreUnrecognized = JNI_FALSE;
     status =CreateJavaVM((JavaVM**)&jvm, (void**)&env, &vm_args);
     if (status != JNI_ERR)
          if(env == NULL)
          printf("Error:cannot create env");
          return NULL;
          cls = env->FindClass("Login");//Login is my java class
          if(cls == NULL)
          printf("Error: cannot find class\n ");
     if(cls !=0)
{ /*  mid = env->GetStaticMethodID(cls, "loginMethod", "(I)I");
     if(mid !=0)
     {  square = env->CallStaticloginMethod(cls, mid, 5);
          printf("Result of intMethod: %d\n", square);
     mid = env->GetStaticMethodID(cls, "booleanMethod", "(Z)Z");
     if(mid !=0)
     {  not = env->CallStaticBooleanMethod(cls, mid, 1);
          printf("Result of booleanMethod: %d\n", not);
     jvm->DestroyJavaVM();
return 0;
     else
     return -1;
But when cls = env->FindClass("Login");cls =null,so printf:"Error: cannot find class".Under windows 2000 and Visual C++6.0
I couldn't solve this problem.Please help me!Urgent!
Thanks!

Answer 1

Maybe I didn't explained explicitly to make you understand my problem.Now I speak out in more detail.
I have a project named depc,its package name is depc.Login is one of classes in package depc.Now I want to call the java class "login" in C++ with JNI.But cls = env->FindClass("Depc/Login") always returns null.I am really at the end of my wits.So please help me if you can.