在使用Jni的JNIEnv->NewStringUTF的时候抛出了异常"JNI DETECTED ERROR IN APPLICATION: input is not valid Modified UTF-8: illegal start byte 0xfe "。网上搜索了一下，这个异常是由于Java虚拟机内部的dalvik/vm/CheckJni.c中的checkUtfString函数抛出的，并且JVM的这个接口明确是不支持四个字节的UTF8字符。因此需要在调用函数之前，对接口传入的字符串进行过滤，过滤函数如下：
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int checkUtfString(const char* bytes) { const char* origBytes = bytes; if (bytes == NULL) { return -1; } while (*bytes != '\0') { unsigned char utf8 = *(bytes++); // Switch on the high four bits. switch (utf8 >> 4) { case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: { // Bit pattern 0xxx. No need for any extra bytes. break; } case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0f: { /*printf("****JNI WARNING: illegal start byte 0x%x\n", utf8);*/ return -1; } case 0x0e: { // Bit pattern 1110, so there are two additional bytes. utf8 = *(bytes++); if ((utf8 & 0xc0) != 0x80) { /*printf("****JNI WARNING: illegal continuation byte 0x%x\n", utf8);*/ return -1; } // Fall through to take care of the final byte. } case 0x0c: case 0x0d: { // Bit pattern 110x, so there is one additional byte. utf8 = *(bytes++); if ((utf8 & 0xc0) != 0x80) { /*printf("****JNI WARNING: illegal continuation byte 0x%x\n", utf8);*/ return -1; } break; } } } return 0; } |