http://www.cnblogs.com/lichien/archive/2011/10/11/2206828.html
jstring与c++字符串类型转换函数
jstring str2jstring(JNIEnv* env, const char * pat) { //定义java String类 strClass jclass strClass = (env)->FindClass( "Ljava/lang/String;" ); //获取String(byte[],String)的构造器,用于将本地byte[]数组转换为一个新String jmethodID ctorID = (env)->GetMethodID(strClass, "<init>" , "([BLjava/lang/String;)V" ); //建立byte数组 jbyteArray bytes = (env)->NewByteArray(strlen(pat)); //将char* 转换为byte数组 (env)->SetByteArrayRegion(bytes, 0 , strlen(pat), (jbyte*)pat); // 设置String, 保存语言类型,用于byte数组转换至String时的参数 jstring encoding = (env)->NewStringUTF( "GB2312" ); //将byte数组转换为java String,并输出 return (jstring)(env)->NewObject(strClass, ctorID, bytes, encoding); } std::string jstring2str(JNIEnv* env, jstring jstr) { char * rtn = NULL; jclass clsstring = env->FindClass( "java/lang/String" ); jstring strencode = env->NewStringUTF( "GB2312" ); 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 ); std::string stemp(rtn); free(rtn); return stemp; } |