Why is the linker displaying such an error? (LNK2019)
Sprite.obj : error LNK2019: unresolved external symbol "public: void __thiscall Sprite::SetPosition(struct tagPOINT)" (?SetPosition@Sprite@@QAEXUtagPOINT@@@Z) referenced in function "public: virtual void __thiscall Sprite::Update(void)" (?Update@Sprite@@UAEXXZ)
Sprite.obj : error LNK2019: unresolved external symbol "public: void __thiscall Sprite::SetVelocity(int,int)" (?SetVelocity@Sprite@@QAEXHH@Z) referenced in function "public: virtual void __thiscall Sprite::Update(void)" (?Update@Sprite@@UAEXXZ)
Sprite.obj : error LNK2019: unresolved external symbol "public: void __thiscall Sprite::SetVelocity(struct tagPOINT)" (?SetVelocity@Sprite@@QAEXUtagPOINT@@@Z) referenced in function "public: virtual void __thiscall Sprite::Update(void)" (?Update@Sprite@@UAEXXZ)
And I have these functions declaration inside the Sprite class:
/*****code omitted******/
virtualvoid Update();
/*****more code omitted*****/
void
SetPosition(int x,int y);void SetPosition(POINT ptPosition);void SetPosition(RECT& rcPosition){ CopyRect(&m_rcPosition, &rcPosition);}
void OffsetPosition(int x,int y);POINT GetVelocity() {
return m_ptVelocity;}void SetVelocity(int x,int y);void SetVelocity(POINT ptVelocity);/******This is the Update function implementation, in the cpp file*****/
void
Sprite::Update(){
// Update the positionPOINT ptNewPosition, ptSpriteSize, ptBoundsSize;
ptNewPosition.x = m_rcPosition.left + m_ptVelocity.x;
ptNewPosition.y = m_rcPosition.top + m_ptVelocity.y;
ptSpriteSize.x = m_rcPosition.right - m_rcPosition.left;
ptSpriteSize.y = m_rcPosition.bottom - m_rcPosition.top;
ptBoundsSize.x = m_rcBounds.right - m_rcBounds.left;
ptBoundsSize.y = m_rcBounds.bottom - m_rcBounds.top;
// Check the bounds// Wrap?if (m_baBoundsAction == BA_WRAP){
if ((ptNewPosition.x + ptSpriteSize.x) < m_rcBounds.left)ptNewPosition.x = m_rcBounds.right;
elseif (ptNewPosition.x > m_rcBounds.right)ptNewPosition.x = m_rcBounds.left - ptSpriteSize.x;
if ((ptNewPosition.y + ptSpriteSize.y) < m_rcBounds.top)ptNewPosition.y = m_rcBounds.bottom;
elseif (ptNewPosition.y > m_rcBounds.bottom)ptNewPosition.y = m_rcBounds.top - ptSpriteSize.y;
}
// Bounce?elseif (m_baBoundsAction == BA_BOUNCE){
BOOL bBounce = FALSE;
POINT ptNewVelocity = m_ptVelocity;
if (ptNewPosition.x < m_rcBounds.left){
bBounce = TRUE;
ptNewPosition.x = m_rcBounds.left;
ptNewVelocity.x = -ptNewVelocity.x;
}
elseif ((ptNewPosition.x + ptSpriteSize.x) > m_rcBounds.right){
bBounce = TRUE;
ptNewPosition.x = m_rcBounds.right - ptSpriteSize.x;
ptNewVelocity.x = -ptNewVelocity.x;
}
if (ptNewPosition.y < m_rcBounds.top){
bBounce = TRUE;
ptNewPosition.y = m_rcBounds.top;
ptNewVelocity.y = -ptNewVelocity.y;
}
elseif ((ptNewPosition.y + ptSpriteSize.y) > m_rcBounds.bottom){
bBounce = TRUE;
ptNewPosition.y = m_rcBounds.bottom - ptSpriteSize.y;
ptNewVelocity.y = -ptNewVelocity.y;
}
if (bBounce)SetVelocity(ptNewVelocity);
}
// Stop (default)else{
if (ptNewPosition.x < m_rcBounds.left ||ptNewPosition.x > (m_rcBounds.right - ptSpriteSize.x))
{
ptNewPosition.x = max(m_rcBounds.left, min(ptNewPosition.x,
m_rcBounds.right - ptSpriteSize.x));
SetVelocity(0, 0);
}
if (ptNewPosition.y < m_rcBounds.top ||ptNewPosition.y > (m_rcBounds.bottom - ptSpriteSize.y))
{
ptNewPosition.y = max(m_rcBounds.top, min(ptNewPosition.y,
m_rcBounds.bottom - ptSpriteSize.y));
SetVelocity(0, 0);
}
}
SetPosition(ptNewPosition);
}
/*****End Update function implementation********************/
What could be wrong?
