Question

正如标题所述，我在定义所有内容时收到链接器错误2019。关于这个最奇怪的部分是我不知道什么时候能得到它。有时候它会正常编译，有时它会给出这个 - 即使不改变代码。问题在于我的Sprite类，我收到了这些错误：

Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: __thiscall Sprite::Sprite(double,double)" (??0Sprite@@QAE@NN@Z) referenced in function "public: virtual void __thiscall FirstRoom::create(class GameEngine *)" (?create@FirstRoom@@UAEXPAVGameEngine@@@Z)   ChoicesEngine   C:\Users\paolo\documents\visual studio 2015\Projects\ChoicesEngine\ChoicesEngine\FirstRoom.obj  1   
Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: void __thiscall Sprite::setImage(long)" (?setImage@Sprite@@QAEXJ@Z) referenced in function "public: virtual void __thiscall FirstRoom::create(class GameEngine *)" (?create@FirstRoom@@UAEXPAVGameEngine@@@Z)   ChoicesEngine   C:\Users\paolo\documents\visual studio 2015\Projects\ChoicesEngine\ChoicesEngine\FirstRoom.obj  1   
Severity    Code    Description Project File    Line    Suppression State
Error   LNK2019 unresolved external symbol "public: void __thiscall Sprite::drawSelf(class SDL2RenderLibrary)" (?drawSelf@Sprite@@QAEXVSDL2RenderLibrary@@@Z) referenced in function "public: void __thiscall GameRoom::displayUpdate(void)" (?displayUpdate@GameRoom@@QAEXXZ)  ChoicesEngine   C:\Users\paolo\documents\visual studio 2015\Projects\ChoicesEngine\ChoicesEngine\GameEngine.obj 1

我多次用Google搜索这个问题，没有解决问题。这是VS 2015中的项目结构，因此您知道我的.cpp文件包含在构建中。 VS Project structure

有相当多的代码，所以我为此道歉。

以下是Sprite.h

#pragma once

#include "SDL2RenderLibrary.h"
#include "Constants.h"

class Sprite
{
public:

    // General positioning variables
    Real x;
    Real y;

    // For collision checking the object
    Real hitBoxLeftTop;
    Real hitBoxLeftBottom;
    Real hitBoxRightTop;
    Real hitBoxRightBottom;

    // The index of the image this is using
    Int imageIndex;

    // The standard contructer, nothing fancy
    Sprite(Real newX, Real newY);

    // Load a graphics for this sprite
    void setImage(Int newIndex);

    // Draw the sprite to the screen
    void drawSelf(SDL2RenderLibrary graphicsHandle);
};

我不确定显示SDL2渲染库的内容是100％的必要条件，因此这里有一个粘贴bin链接：Pastebin

以下是Sprite.cpp

#include "Sprite.h"

Sprite::Sprite(Real newX, Real newY)
{
    x = newX;
    y = newY;

    hitBoxLeftTop = 0;
    hitBoxLeftBottom = 0;
    hitBoxRightTop = 0;
    hitBoxRightBottom = 0;

    imageIndex = -1;
}

void Sprite::setImage(Int newIndex)
{
    imageIndex = newIndex;
}

void Sprite::drawSelf(SDL2RenderLibrary graphicsHandle)
{
    // Only render if the sprite's image isn't -1
    if (imageIndex != -1)
    {
        graphicsHandle.CEF_RenderImage(x, y, imageIndex);
    }
}

现在为FirstRoom.h

#pragma once

#include "GameEngine.h"

class FirstRoom : public GameRoom
{
public:

    // Everything relating to the player
    Sprite* sPlayer;
    float baseSpeed;
    float currentSpeed;

    void create(GameEngine* newRoot);
    void update();
};

最后FirstRoom.cpp

#include "FirstRoom.h"

void FirstRoom::create(GameEngine* newRoot)
{
    GameRoom::create(newRoot);

    // Player related things
    baseSpeed = 5;
    sPlayer = new Sprite(50, 50);
    sPlayer->setImage(root->loadImage("player.bmp"));
    addChild(sPlayer);
}

void FirstRoom::update()
{
    // This frame's speed is determined by delta
    currentSpeed = baseSpeed * root->display->CEV_DeltaMultiplier;

    // Check movement
    if (checkKey("W"))
    {
        sPlayer->y -= currentSpeed;
    }
    if (checkKey("S"))
    {
        sPlayer->y += currentSpeed;
    }
    if (checkKey("A"))
    {
        sPlayer->x -= currentSpeed;
    }
    if (checkKey("D"))
    {
        sPlayer->x += currentSpeed;
    }

    root->display->CEF_RenderText(0, 0, std::to_string(root->display->CEV_CurrentFPS), 255, 255, 255);

    displayUpdate();
}

我不知道是否应粘贴GameEngine件事，因此如果需要，请说明。这之前有用，所以我确定GameEngine / GameRoom课程中的所有内容都做得很好。我再次为过多的代码道歉，我只是不知道我的问题在哪里。

提前致谢

Answer 1

你的构造函数是：

Sprite(Real newX, Real newY);

我的第一个猜测是，可能有50个被认为是双倍而不是真正的＆＃39;。

也许有点像：

Real x(50), y(50)
sPlayer = new Sprite(x, y);

in void FirstRoom :: create（GameEngine * newRoot）

同样适用于其他错误。即。 setImage有一个Int参数，但它接收和int / long。

链接器错误2019定义所有内容时

1 个答案: