localreflibrary.cpp

< Professional Java,JDK 5 Edition> 经典例程源代码。

// LocalRefLibrary.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "../LocalRefExample.h"

JNIEXPORT void JNICALL Java_LocalRefExample_testLocalRefs
  (JNIEnv *env, jobject obj)
{
    jint count;

    // Let's figure out just how many local references
    // we can create...
    for(count=16; count<10000; count++) {
        if(env->EnsureLocalCapacity(count+1)) {
            break;
        }
    }

    printf("I can create up to %d local references\n", count);

    // Now let's create a few...
    jcharArray charArray;
    jintArray intArray;
    jstring str;

    str = env->NewStringUTF("This is a test");

    if(env->PushLocalFrame(10)) {
        charArray = env->NewCharArray(13);

        if(charArray == NULL) {
            printf("Failed to create character array\n");
            return;
        }

        if(env->PushLocalFrame(10)) {
            intArray = env->NewIntArray(14);

            if(intArray == NULL) {
                printf("Failed to create integer array\n");
                return;
            }

            // intArray created. Use PopLocalFrame to free all allocated
            // references in this scope level, in this case just intArray
            env->PopLocalFrame(NULL);
        }

        // charArray created. Use PopLocalFrame to free all allocated
        // references in this scope level, in this case just charArray
        env->PopLocalFrame(NULL);
    }

    // 'str' is freed after this function exits
}

BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    return TRUE;
}