小编fiv*_*nlm的帖子

我正在创建一个C++共享库,当我编译一个使用该库的主exe时,编译器给了我:

main.cpp:(.text+0x21): undefined reference to `FooClass::SayHello()'
collect2: ld returned 1 exit status

图书馆代码:

fooclass.h

#ifndef __FOOCLASS_H__
#define __FOOCLASS_H__

class FooClass 
{
    public:
        char* SayHello();
};

#endif //__FOOCLASS_H__

fooclass.cpp

#include "fooclass.h"

char* FooClass::SayHello() 
{
    return "Hello Im a Linux Shared Library";
}

编译:

g++ -shared -fPIC fooclass.cpp -o libfoo.so

主要:main.cpp

#include "fooclass.h"
#include <iostream>

using namespace std;

int main(int argc, char const *argv[])
{
    FooClass * fooClass = new FooClass();

    cout<< fooClass->SayHello() << endl;

    return 0;
}

编译:

g++ -I. -L. …

我正在尝试将矢量资产设置到晶圆厂中。但结果是这样的： 正如您所看到的，矢量在那里，但在下方和左侧。这是布局

    <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorBg"
    tools:context=".ui.main.fragments.HomeFragment">


    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab_new_sale"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        app:backgroundTint="@color/colorAccent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:srcCompat="@drawable/ic_cart_plus"
        android:scaleType="center"/>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_home_cards"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:foregroundGravity="center_vertical|center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

这是向量：

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="200dp"
    android:height="200dp"
    android:viewportWidth="200"
    android:viewportHeight="200">
    <path
        android:fillColor="#FF000000"
        android:pathData="M165.1,119.28L75,119.28l2,9.84h82.48a7.37,7.37 0,0 1,7.19 9l-1.7,7.46a17.2,17.2 0,1 1,-19.54 3.19L81,148.77a17.21,17.21 0,1 1,-20.6 -2.63L38.85,40.62L17.38,40.62A7.38,7.38 0,0 1,10 33.24L10,28.33A7.37,7.37 0,0 1,17.38 21h31.5a7.38,7.38 0,0 1,7.23 5.9l2.81,13.77h120.7a7.37,7.37 0,0 1,7.19 9l-14.52,63.91A7.38,7.38 0,0 1,165.1 119.28ZM135.38,72.58L120.63,72.58L120.63,60.28a4.92,4.92 0,0 0,-4.92 -4.91h-4.92a4.91,4.91 0,0 0,-4.91 4.91v12.3L91.13,72.58a4.91,4.91 0,0 0,-4.92 4.91v4.92a4.92,4.92 0,0 …