我想将数据发送回创建此对象的类。
这与游戏有关。 敌人对象具有线程功能,并在场景中自行移动。
如果将包含创建到对象的类的头文件包含在对象本身中,则会产生大量错误...传递指针。
敌人类:
Class Enemy
{
private:
void (*iChange)(DWORD &);
}:
Enemy::Enemy(void (*iChangeHandler)(DWORD &) ) : iChange(0)
{
this->iChange = iChangeHandler;
}
void Enemy::Draw(D3DGraphics& gfx)
{
this->iChange(this->dwThreadID); // send a message back to the class that created me
gfx.PutPixel(this->my_position_x + 0,this->my_position_y,this->red,this->blue,this->green);
this->grafix->DrawCircle(this->my_position_x + 0,this->my_position_y, this->radius, this->red,this->blue,this->green);
(sprintf)( this->enemy_buffer, "X: %d, Y: %d", this->my_position_x , this->my_position_y);
this->grafix->DrawString( this->enemy_buffer, this->my_position_x , this->my_position_y, &fixedSys, D3DCOLOR_XRGB(255, 0, 0) );
}
游戏类:
struct enemies_array_ARRAY {
std::string name;
DWORD ID;
Enemy* enemy;
} enemies_array[25];
void Game::EnemyEvent(DWORD &thread_id)
{
enemies_array[0]...... // i want to acces this struct array
}
Game::Game(HWND hWnd)
{
enemies_array[0].name = "john Doe";
enemies_array[0].ID = NULL;
enemies_array[0].enemy = new Enemy(&Game::EnemyEvent);
// error: C2664:
// another attemp
enemies_array[0].name = "john Doe";
enemies_array[0].ID = NULL;
enemies_array[0].enemy = new Enemy(Game::EnemyEvent);
// error C3867:
}
答案 0 :(得分:1)
如果我理解正确,你想在Game
对象上调用一个函数。这意味着您需要将指针传递给Game
对象才能在其上正确调用non static member function pointer(iChange)。
进行如下所示的更改,您应该能够做您想做的事情
enemies_array[0].enemy = new Enemy(this,&Game::EnemyEvent);
typedef void (Game::*ChangeFunc)(DWORD &)
Class Enemy
{
private:
ChangeFunc iChange;
Game *pGame;
}:
Enemy(Game *pCreatorGame, ChangeFunc iChangeHandler )
{
iChange = iChangeHandler;
pGame = pCreatorGame;
}
void Enemy::Draw(D3DGraphics& gfx)
{
(pGame->*iChange)(this->dwThreadID);