Question

当我尝试在向量中搜索特定值时，我遇到了分段错误。该向量的类型为Person

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detect);

    detector = new FaceDetector.Builder(getApplicationContext())
            .setTrackingEnabled(false)
            .setProminentFaceOnly(true)
            .setMode(FaceDetector.FAST_MODE)
            .setMinFaceSize((float) 0.60)
            .setLandmarkType(FaceDetector.ALL_CLASSIFICATIONS)
            .setClassificationType(FaceDetector.ALL_CLASSIFICATIONS)

            .build();


    initViews();

}

private void initViews() {
    imgTakePicture = (ImageView) findViewById(R.id.imgTakePic);
    btnTakePicture = (Button) findViewById(R.id.btnTakePicture);
    txtSampleDesc = (TextView) findViewById(R.id.txtSampleDescription);
    txtTakenPicDesc = (TextView) findViewById(R.id.textView);

    btnTakePicture.setOnClickListener(this);
    imgTakePicture.setOnClickListener(this);


}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.d(TAG, "onActivityResult: this is resyult");
    if (requestCode == CAMERA_REQUEST && resultCode == RESULT_OK) {
        launchMediaScanIntent();
        try {
            processCameraPicture();
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "Failed to load Image", Toast.LENGTH_SHORT).show();
        }
    }
}

private void launchMediaScanIntent() {
    Log.d(TAG, "launchMediaScanIntent: ");
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    mediaScanIntent.setData(imageUri);
    this.sendBroadcast(mediaScanIntent);
}

private void startCamera() {
    Log.d(TAG, "startCamera: ");
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    Log.d(TAG, "startCamera: 2");
    File photo = new File(Environment.getExternalStorageDirectory(), "/videoDIARY/ReferencePic/photo.jpg");

    imageUri = Uri.fromFile(photo);

    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);

    startActivityForResult(intent, CAMERA_REQUEST);

}

这是我的搜索功能：

struct Person{
    string name;
    string address;
    string email;
    string number;
    string SocialSec;
    string other;
};

以下是==和＆lt;＆lt;的运算符重载操作符：

void searchContact(vector<Person> &people) {
    string searchTerm;
    cout << endl;
    cout << "Enter search term: ";
    getline(cin, searchTerm);
    vector<Person>::iterator it=find(people.begin(), people.end(), searchTerm);

    if (it != people.end()){
        cout << *it;
    }else{
        cout << "Element not found\n";
    }
}

这就是分段错误的样子：

ostream& operator<<(ostream &stream, const Person &it){
    stream << it;
    return stream;
}

    bool operator==(const Person &lhs, const string &rhs){
        return lhs.name == rhs;     
    }

进行回溯：

Program received signal SIGSEGV, Segmentation fault.
0x00005555555565ae in operator<< (
    stream=<error reading variable: Cannot access memory at address 0x7fffff7feff8>, 
    it=<error reading variable: Cannot access memory at address 0x7fffff7feff0>) at class.cpp:114
114 ostream& operator<<(ostream &stream, const Person &it){
(gdb)

为什么会发生这种情况，我该如何解决这个问题？是堆栈溢出吗？

编辑：添加运算符＆lt;＆lt;在原帖中过载以便澄清。

Answer 1

您的操作员应该打印Person类的基本类型。像这样：

ostream& operator<<(ostream &stream, const Person &it){
    stream << "This is the name: " << it.name;
    return stream;
}

如果你做流＆lt;＆lt;它在你的函数内部，它将继续尝试在无限递归调用中打印Person。

Answer 2

哦，对不起，复制粘贴我有点不对劲。这是我的运营商＆lt;＆lt;重载：

ostream& operator<<(ostream &stream, const Person &it){
    stream << it;
    return stream;
}

在向量中搜索时的分段错误

2 个答案: