jbytearray转c++byte数组
- jbyte * arrayBody = env->GetByteArrayElements(data,0);
- jsize theArrayLengthJ = env->GetArrayLength(data);
- BYTE * starter = (BYTE *)arrayBody;
jbyteArray 转 c++中的BYTE[]
- //jbytearray strIn
- jbyte * olddata = (jbyte*)env->GetByteArrayElements(strIn, 0);
- jsize oldsize = env->GetArrayLength(strIn);
- BYTE* bytearr = (BYTE*)olddata;
- int len = (int)oldsize;
C++中的BYTE[]转jbyteArray
- //nOutSize是BYTE数组的长度 BYTE pData[]
- jbyte *by = (jbyte*)pData;
- jbyteArray jarray = env->NewByteArray(nOutSize);
- env->SetByteArrayRegin(jarray, 0, nOutSize, by);
jbyteArray 转 char *
- char* data = (char*)env->GetByteArrayElements(strIn, 0);
char* 转jstring
- jstring WindowsTojstring(JNIEnv* env, char* str_tmp)
- {
- jstring rtn=0;
- int slen = (int)strlen(str_tmp);
- unsigned short* buffer=0;
- if(slen == 0)
- {
- rtn = env->NewStringUTF(str_tmp);
- }
- else
- {
- int length = MultiByteToWideChar(CP_ACP, 0, (LPCSTR)str_tmp, slen, NULL, 0);
- buffer = (unsigned short*)malloc(length*2+1);
- if(MultiByteToWideChar(CP_ACP, 0, (LPCSTR)str_tmp, slen, (LPWSTR)buffer, length) > 0)
- {
- rtn = env->NewString((jchar*)buffer, length);
- }
- }
- if(buffer)
- {
- free(buffer);
- }
- return rtn;
- }
下面这个没有用过,刚看到,也写进来,以后如果遇到可以验证下看。
jstring 转 char* 或者 const char*
- // jstring str
- const char *key = env->GetStringUTFChars(str, 0);
- //jboolean isOffer
- jsClient->modify(key, isOffer);
- env->ReleaseStringUTFChars(str, key);
JNI 返回 jbyteArray
- JNIEXPORT jbyteArray JNICALL Java_Test_getByteArray(JNIEnv *env, jobject obj)
- {
- jbyteArray firstMacArray = env->NewByteArray( 6 );
- ......
- jbyte *bytes = env->GetByteArrayElements( firstMacArray, 0);
- for ( int i = 0; i < sizeof( pAdapterInfo->Address ); i++ )
- {
- bytes[ i ] = pAdapterInfo->Address[ i ];
- }
- env->SetByteArrayRegion(firstMacArray, 0, 6, bytes );
- return firstMacArray;
- }
//jstring to char*
- char* jstringTostring(JNIEnv* env, jstring jstr)
- {
- char* rtn = NULL;
- jclass clsstring = env->FindClass("java/lang/String");
- jstring strencode = env->NewStringUTF("utf-8");
- jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");
- jbyteArray barr= (jbyteArray)env->CallObjectMethod(jstr, mid, strencode);
- jsize alen = env->GetArrayLength(barr);
- jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE);
- if (alen > 0)
- {
- rtn = (char*)malloc(alen + 1);
- memcpy(rtn, ba, alen);
- rtn[alen] = 0;
- }
- env->ReleaseByteArrayElements(barr, ba, 0);
- return rtn;
- }
//char* to jstring
- jstring stoJstring(JNIEnv* env, const char* pat)
- {
- jclass strClass = env->FindClass("Ljava/lang/String;");
- jmethodID ctorID = env->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V");
- jbyteArray bytes = env->NewByteArray(strlen(pat));
- env->SetByteArrayRegion(bytes, 0, strlen(pat), (jbyte*)pat);
- jstring encoding = env->NewStringUTF("utf-8");
- return (jstring)env->NewObject(strClass, ctorID, bytes, encoding);
- }
//将jstring类型转换成windows类型
- char* jstringToWindows( JNIEnv *env, jstring jstr )
- {
- int length = (env)->GetStringLength(jstr );
- const jchar* jcstr = (env)->GetStringChars(jstr, 0 );
- char* rtn = (char*)malloc( length*2+1 );
- int size = 0;
- size = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL, NULL );
- if( size <= 0 )
- return NULL;
- (env)->ReleaseStringChars(jstr, jcstr );
- rtn[size] = 0;
- return rtn;
- }
//将windows类型转换成jstring类型
- jstring WindowsTojstring( JNIEnv* env, char* str )
- {
- jstring rtn = 0;
- int slen = strlen(str);
- unsigned short * buffer = 0;
- if( slen == 0 )