JNI WARNING: NewStringUTF input is not valid Modified UTF-8: illegal start byte 0xf5
2017-06-01 09:06
786 查看
原因是没有指定string的结束符’\0’,也就是代码中注释的那句话，加上就好了
extern "C"
JNIEXPORT jstring JNICALL
Java_com_komlin_gpio_gpiotest_Gpio_powerState(JNIEnv *env, jclass type) {
FILE *pFile;
char value[4];
pFile = fopen("/sys/class/gpio/gpio233/direction", "w+");
fwrite("in", sizeof(char), sizeof("in"), pFile);
fclose(pFile);
pFile = fopen("/sys/class/gpio/gpio233/value", "r+");
fread(value, sizeof(char), 1, pFile);
fclose(pFile);
//value[1] = '\0';
std::string returnValue = value;
return env->NewStringUTF(returnValue.c_str());
}
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