DirectX 11 LNK错误2005、2019和1120

Question

我正在看一本关于如何使用driectx 11进行编程的书，但是即使我已经将它编程为完全相同并检查了几乎一整天的差异，我仍然遇到3个错误。 我有3个错误

error LNK1120: 1 unresolved externals   C:\Users\Me\documents\visual studio 2013\Projects\TestX engine\Debug\TestX engine.exe   1   1   TestX engine
Error   2   error LNK2019: unresolved external symbol _D3DX11CreateEffectFromMemory@20 referenced in function "private: void __thiscall BoxApp::BuildFX(void)" (?BuildFX@BoxApp@@AAEXXZ)    C:\Users\Me\documents\visual studio 2013\Projects\TestX engine\TestX engine\Box.obj TestX engine
Error   1   error LNK2005: _WinMain@16 already defined in Box.obj   C:\Users\Me\documents\visual studio 2013\Projects\TestX engine\TestX engine\InitDirect3D.obj    TestX engine

我的应用程序代码是：

class BoxApp : public Framework_App
{
public:
    BoxApp(HINSTANCE hInstance);
    ~BoxApp();

bool Init();
void OnResize();
void UpdateScene( float dt);
void DrawScene();
void OnMouseDown(WPARAM btnState, int x, int y);
void OnMouseUp(WPARAM btnState, int x, int y);
void OnMouseMove(WPARAM btnState, int x, int y);

private:
void BuildGeometryBuffers();
void BuildFX();
void BuildVertexlayout();

ID3D11Buffer* mBoxVB;
ID3D11Buffer* mBoxIB;
ID3DX11Effect* mFX;
ID3DX11EffectTechnique* mTech;
ID3DX11EffectMatrixVariable* mfxWorldViewProj;
ID3D11InputLayout* inputLayout;

XMFLOAT4X4 mWorld;
XMFLOAT4X4 mView;
XMFLOAT4X4 mProj;

float mTheta, mPhi, mRadius;
POINT mLastMousePos;
};

问题应该在这些部分附近，但是我找不到它们：

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE PrevhInstance, PSTR cmdLine, int showCmd){
BoxApp theApp(hInstance);
if (!theApp.Init())
{
    return 0;
}

return theApp.App_Run();

}

和：

void BoxApp::BuildFX()
{
DWORD shaderFlags = 0;
ID3D10Blob * compiledShader;
ID3D10Blob * compiledShaderMsgs;
HRESULT hr = D3DX11CompileFromFile((LPSTR)"mColor.fx", 0, 0, 0, "fx_5_0", shaderFlags, 0, 0, &compiledShader, &compiledShaderMsgs, 0);

if (compiledShaderMsgs != 0)
{
    MessageBoxA(0, (char*)compiledShaderMsgs->GetBufferPointer(), 0, 0);
    ReleaseCOM(compiledShaderMsgs);
}

D3DX11CreateEffectFromMemory(compiledShader->GetBufferPointer(), compiledShader->GetBufferSize(), 0, MainD3DDevice, &mFX);
ReleaseCOM(compiledShader);

mTech = mFX->GetTechniqueByName("ColorTech");
mfxWorldViewProj = mFX->GetVariableByName("gWorldViewProj")->AsMatrix();
}

特别是在第二位： D3DX11CreateEffectFromMemory(compiledShader->GetBufferPointer(), compiledShader->GetBufferSize(), 0, MainD3DDevice, &mFX);

预先谢谢你，我真的很感激。