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com_ft_mynative_MyNativeJava.cpp
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441 lines (391 loc) · 15 KB
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#include "com_ft_mynative_MyNativeJava.h"
#include <iostream>
#include <cstring>
using std::cout;
using std::endl;
/*
* Class: com_ft_mynative_MyNativeJava
* Method: fun
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_com_ft_mynative_MyNativeJava_fun
(JNIEnv *, jobject) {
cout << "fun()" << endl;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: fun2
* Signature: (Ljava/lang/String;)I
*/
JNIEXPORT jint JNICALL Java_com_ft_mynative_MyNativeJava_fun2
(JNIEnv *env, jobject thisObj, jstring str) {
const char *cStr = env->GetStringUTFChars(str, NULL);
if (NULL != cStr) {
cout << "fun2(" << cStr << ")" << endl;
} else {
cout << "fun2(string) fail" << endl;
}
jint len = strlen(cStr);
env->ReleaseStringUTFChars(str, cStr);
return len;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: fun3
* Signature: ([Ljava/lang/Integer;)V
*/
JNIEXPORT void JNICALL Java_com_ft_mynative_MyNativeJava_fun3
(JNIEnv *env, jobject thisObj, jobjectArray intArr) {
jclass clsInteger = env->FindClass("java/lang/Integer");
if (NULL == clsInteger) {
cout << "find class java/lang/Integer fail" << endl;
return;
}
jmethodID method = env->GetMethodID(clsInteger, "intValue", "()I");
if (NULL == method) {
cout << "find method intValue()I fail" << endl;
return;
}
jint sum = 0;
jsize len = env->GetArrayLength(intArr);
cout << "IntegerArray len is " << len << " items is ";
for (int i=0; i<len; i++) {
jobject objInteger = env->GetObjectArrayElement(intArr, i);
if (NULL != objInteger) {
jint ivalue = env->CallIntMethod(objInteger, method);
cout << ivalue << ", ";
sum += ivalue;
}
}
cout << "total is " << sum << endl;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: baseTypes
* Signature: (ICZSJFDB)Z
*/
JNIEXPORT jboolean JNICALL Java_com_ft_mynative_MyNativeJava_baseTypes
(JNIEnv *env, jobject thisObj, jint ia, jchar cb, jboolean bc, jshort sd, jlong le, jfloat ff, jdouble dj, jbyte bh) {
cout << " jint " << ia << endl;
cout << " jchar " << cb << endl;
cout << " jboolean " << (bc==JNI_TRUE) << endl;
cout << " jshort " << sd << endl;
cout << " jlong " << le << endl;
cout << " jfloat " << ff << endl;
cout << " jdouble " << dj << endl;
cout << " jbyte " << bh << endl;
cout << "jXXX 直接转换成 XXX" << endl;
int xxx_ia = ia;
char xxx_cb = cb;
bool xxx_bc = (bc==JNI_TRUE);
short xxx_sd = sd;
long xxx_le = le;
float xxx_ff = ff;
double xxx_dj = dj;
unsigned char xxx_bh = bh;
cout << " int " << xxx_ia << endl;
cout << " char " << xxx_cb << endl;
cout << " boolean " << xxx_bc << endl;
cout << " short " << xxx_sd << endl;
cout << " long " << xxx_le << endl;
cout << " float " << xxx_ff << endl;
cout << " double " << xxx_dj << endl;
cout << " byte " << xxx_bh << endl;
return true;
}
template<typename T>
void parse_wrap_base_type(JNIEnv *env, jobject thisObj, const char *className, const char *methodName, const char *rparams) {
jclass cls = NULL;
jmethodID mid = NULL;
cls = env->FindClass(className);
if (NULL == cls) {
cout << "FindClass(" << className << ") fail" << endl;
return;
}
mid = env->GetMethodID(cls, methodName, rparams);
if (NULL == mid) {
cout << "get method " << methodName << "(" << rparams << ") fail" << endl;
return;
}
T t = (T)env->CallIntMethod(thisObj, mid);
cout << "parse_wrap_base_type<T>(" << className << ", " << methodName << ", " << rparams << ") = " << t << endl;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: wrapBaseTypes
* Signature: (Ljava/lang/Integer;Ljava/lang/Character;Ljava/lang/Boolean;Ljava/lang/Short;Ljava/lang/Long;Ljava/lang/Float;Ljava/lang/Double;Ljava/lang/Byte;)Ljava/lang/Boolean;
*/
JNIEXPORT jobject JNICALL Java_com_ft_mynative_MyNativeJava_wrapBaseTypes
(JNIEnv *env, jobject thisObj, jobject ia, jobject cb, jobject bc, jobject sd, jobject le, jobject ff, jobject dh, jobject bi) {
// new Integer(5).intValue();
// new Boolean(false).booleanValue();
// new Short((short)4).shortValue();
// new Long((long)6).longValue();
// new Character('a').charValue();
// new Float(5.0f).floatValue();
// new Double(5.9).doubleValue();
// new Byte((byte)5).byteValue();
// Boolean.valueOf(false);
parse_wrap_base_type<int>(env, ia, "Ljava/lang/Integer;", "intValue", "()I");
parse_wrap_base_type<bool>(env, bc, "Ljava/lang/Boolean;", "booleanValue", "()Z");
parse_wrap_base_type<char>(env, cb, "Ljava/lang/Character;", "charValue", "()C");
parse_wrap_base_type<short>(env, sd, "Ljava/lang/Short;", "shortValue", "()S");
parse_wrap_base_type<long>(env, le, "Ljava/lang/Long;", "longValue", "()J");
parse_wrap_base_type<float>(env, ff, "Ljava/lang/Float;", "floatValue", "()F");
parse_wrap_base_type<double>(env, dh, "Ljava/lang/Double;", "doubleValue", "()D");
parse_wrap_base_type<unsigned char>(env, bi, "Ljava/lang/Byte;", "byteValue", "()B");
jobject obj = NULL;
jmethodID mid = NULL;
jclass cls = env->FindClass("Ljava/lang/Boolean;");
if (NULL != cls) {
mid = env->GetMethodID(cls, "<init>", "(Z)V");
if (NULL != mid) {
obj = env->NewObject(cls, mid, true);
cout << "use constructor method conv is ok" << endl;
}
mid = env->GetStaticMethodID(cls, "valueOf", "(Z)Ljava/lang/Boolean;");
if (NULL != mid) {
env->CallStaticBooleanMethod(cls, mid, false);
cout << "use static method conv is ok" << endl;
}
}
return obj;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: intArray
* Signature: ([I)[Z
*/
JNIEXPORT jbooleanArray JNICALL Java_com_ft_mynative_MyNativeJava_intArray
(JNIEnv *env, jobject thisObj, jintArray intA) {
jsize len = env->GetArrayLength(intA);
jint ji = 0;
jint sum = 0;
cout << "conv jintArray to c int[], len is " << len << ", items is " << endl;
jclass cls = env->FindClass("Ljava/lang/Boolean;");
jbooleanArray boolArr = env->NewBooleanArray(len);
jboolean *bools = new jboolean[len];
jboolean jb = false;
jint *jia = env->GetIntArrayElements(intA, &jb);
if (NULL != jia) {
for (int i=0; i<len; i++) {
ji = jia[i];
sum += ji;
cout << ji << ", ";
// num 偶数 则为 true，否则为false
bools[i] = (ji&1) == 1 ? true : false;
}
env->SetBooleanArrayRegion(boolArr, 0, len, bools);
env->ReleaseIntArrayElements(intA, jia, 0);
}
cout << " total is " << sum << endl;
return boolArr;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: wrapIntArray
* Signature: ([Ljava/lang/Integer;)[Ljava/lang/Boolean;
*/
JNIEXPORT jobjectArray JNICALL Java_com_ft_mynative_MyNativeJava_wrapIntArray
(JNIEnv *env, jobject thisObj, jobjectArray integerA) {
jsize len = env->GetArrayLength(integerA);
jint ji = 0;
jint sum = 0;
cout << "conv jintArray to c int[], len is " << len << ", items is " << endl;
jclass cls = env->FindClass("Ljava/lang/Boolean;");
jobjectArray boolArr = env->NewObjectArray(len, cls, NULL);
jboolean jb = false;
jobject jobj = NULL;
for (int i=0; i<len; i++) {
jobj = env->GetObjectArrayElement(integerA, i);
if (NULL != jobj) {
jmethodID mid = env->GetMethodID(env->FindClass("Ljava/lang/Integer;"), "intValue", "()I");
if (NULL != mid) {
ji = (jint)env->CallIntMethod(jobj, mid);
sum += ji;
cout << ji << ", ";
// num 偶数 则为 true，否则为false
jobject obj = NULL;
if (NULL != cls) {
jmethodID mid = env->GetStaticMethodID(cls, "valueOf", "(Z)Ljava/lang/Boolean;");
jboolean isok = (ji&1)==1 ? true : false;
if (NULL != mid) {
obj = env->CallStaticObjectMethod(cls, mid, isok);
env->SetObjectArrayElement(boolArr, i, obj);
}
}
}
}
}
cout << " total is " << sum << endl;
return boolArr;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: stringTest
* Signature: (Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_com_ft_mynative_MyNativeJava_stringTest
(JNIEnv *env, jobject thisObj, jstring jstr) {
jboolean isok = false;
const char *cstr = env->GetStringUTFChars(jstr, NULL);
cout << "input str is \"" << cstr <<"\"" << endl;
env->ReleaseStringUTFChars(jstr, cstr);
char buf[256];
sprintf(buf, "\"%s\" is modifyed", cstr);
jstring jsret = env->NewStringUTF(buf);
return jsret;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: strArrTest
* Signature: ([Ljava/lang/String;)[Ljava/lang/String;
*/
JNIEXPORT jobjectArray JNICALL Java_com_ft_mynative_MyNativeJava_strArrTest
(JNIEnv *env, jobject thisObj, jobjectArray jobjA) {
int len = env->GetArrayLength(jobjA);
cout << "String[] len is " << len << ", items is " << endl;
if (len < 1) {
return NULL;
}
jobjectArray jobjs = env->NewObjectArray(len, env->FindClass("Ljava/lang/String;"), NULL);
for (int i=0; i<len; i++) {
jstring jstr1 = (jstring)env->GetObjectArrayElement(jobjA, i);
const char *js = env->GetStringUTFChars(jstr1, NULL);
cout << js << ", " << endl;
char buf[256];
sprintf(buf, "%s after modify", js);
env->ReleaseStringUTFChars(jstr1, js);
jstring jstr = env->NewStringUTF(buf);
env->SetObjectArrayElement(jobjs, i, jstr);
}
return jobjs;
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: modifyFields
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_com_ft_mynative_MyNativeJava_modifyFields
(JNIEnv *env, jobject thisObj) {
// private int num = 5;
// private char[] ca = {'a', 'b'};
// private String str = "tom";
// private String[] strA = {"one", "two"};
//
// private static int snum = 5;
// private static char[] sca = {'a', 'b'};
// private static String sstr = "bruce";
// private static String[] sstrA = {"Monday", "Tuesty"};
jclass cls = env->GetObjectClass(thisObj);
if (NULL == cls) {
cout << "getObjectClass is NULL" << endl;
return;
}
jfieldID fid = NULL;
// private int num = 5; + 2
fid = env->GetFieldID(cls, "num", "I");
if (NULL != fid) {
jint it = env->GetIntField(thisObj, fid);
env->SetIntField(thisObj, fid, it+2);
cout << "modify filed num from " << it << " to " << it+2 << endl;
}
// modify private char[] ca = {'a', 'b'}; + 2
fid = env->GetFieldID(cls, "ca", "[C");
if (NULL != fid) {
jcharArray carr = (jcharArray)env->GetObjectField(thisObj, fid);
int arrLen = env->GetArrayLength(carr);
jchar *cs = (jchar*)env->GetCharArrayElements(carr, NULL);
cout << "modify field ca['a', 'b'] len is " << arrLen << endl;
carr = env->NewCharArray(arrLen);
jchar *pca = new jchar[arrLen];
for (int i=0; i<arrLen; i++) {
pca[i] = cs[i] + 2;
cout << "from " << (char)cs[i] << " to " << (char)((char)(cs[i])+2) << endl;
}
env->SetCharArrayRegion(carr, 0, arrLen, pca);
env->SetObjectField(thisObj, fid, carr);
env->ReleaseCharArrayElements(carr, (jchar*)cs, 0);
}
// modify private String str = "tom"; + 2
// modify private String[] strA = {"one", "two"}; + 2
// modify private static int snum = 5; + 2
fid = env->GetStaticFieldID(cls, "snum", "I");
if (NULL != fid) {
jint jit = env->GetStaticIntField(cls, fid);
env->SetStaticIntField(cls, fid, jit+2);
cout << "modify static snum from " << jit << " to " << jit+2 << endl;
}
// modify private static char[] sca = {'a', 'b'}; + 2
// modify private static String sstr = "bruce"; + 2
// modify private static String[] sstrA = {"Monday", "Tuesty"}; + 2
fid = env->GetStaticFieldID(cls, "sstrA", "[Ljava/lang/String;");
if (NULL != fid) {
jobjectArray strArr = (jobjectArray)env->GetStaticObjectField(cls, fid);
int len = env->GetArrayLength(strArr);
if (len > 0) {
cout << "modify static String[] sstrA, len is " << len << endl;
cout << "before modify items is " << endl;
for (int i=0; i<len; i++) {
jstring str = (jstring)env->GetObjectArrayElement(strArr, i);
const char *cstr = env->GetStringUTFChars(str, NULL);
cout << cstr << ", " << endl;
char buf[128];
sprintf(buf, "%s after modify", cstr);
jstring jstr2 = env->NewStringUTF(buf);
env->SetObjectArrayElement(strArr, i, jstr2);
env->ReleaseStringUTFChars(str, cstr);
}
cout << "after modify items is " << endl;
for (int i=0; i<len; i++) {
jstring str = (jstring)env->GetObjectArrayElement(strArr, i);
const char *cstr = env->GetStringUTFChars(str, NULL);
cout << cstr << ", " << endl;
env->ReleaseStringUTFChars(str, cstr);
}
env->SetStaticObjectField(cls, fid, strArr);
}
}
}
/*
* Class: com_ft_mynative_MyNativeJava
* Method: testMethod
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_com_ft_mynative_MyNativeJava_testMethod
(JNIEnv *env, jobject thisObj) {
jclass cls = env->GetObjectClass(thisObj);
if (NULL == cls) {
cout << "getobjectclass is null" << endl;
return;
}
jmethodID mid = NULL;
// private void testInt(int a);
mid = env->GetMethodID(cls, "testInt", "(I)V");
if (NULL != mid) {
env->CallVoidMethod(thisObj, mid, 5);
}
// private void testString(String s);
mid = env->GetMethodID(cls, "testString", "(Ljava/lang/String;)V");
if (NULL != mid) {
char *cstr = new char[32];
strcpy(cstr, "this is c string");
jstring jstr = env->NewStringUTF(cstr);
env->CallVoidMethod(thisObj, mid, jstr);
// 不能释放，会出错，让java自己释放
//env->ReleaseStringUTFChars(jstr, cstr);
}
// private static void stestInt(int a);
mid = env->GetStaticMethodID(cls, "stestInt", "(I)V");
if (NULL != mid) {
env->CallStaticVoidMethod(cls, mid, 5);
}
// private static void stestString(String s);
mid = env->GetStaticMethodID(cls, "stestString", "(Ljava/lang/String;)V");
if (NULL != mid) {
const char *cstr = "this is c string";
jstring jstr = env->NewStringUTF(cstr);
env->CallStaticVoidMethod(cls, mid, jstr);
//env->ReleaseStringUTFChars(jstr, cstr);
}
}