请问下 hdc=::GetDC(m_hwnd)中函数GetDC前的::我是大菜鸟,:

请问下 hdc=::GetDC(m_hwnd)中函数GetDC前的::我是大菜鸟,: //获取当前DC HDC hdc=getdc()->m_hdc; 请问各位大侠, HDC hdc; hdc=::GetDC(m_hWnd); GetDC()有什么用,直接把m_hWnd这个句柄给hdc不行么 hdc=m_hWnd；这个样子 x=ceil(x0 48*cos(a));hdc=GetDC(hwnd);ASCtoBASE64(a);unsignedcharcommand_4 为什么使用GetParent画线,鼠标指针与屏幕上的线隔一段距离?代码如下:/* CDC *hdc=GetDC();hdc->MoveTo(Mypoint.x,Mypoint.y);hdc->LineTo(point);ReleaseDC(hdc);*/CClientDC ccdc(GetParent());// CWindowDC ccdc(GetParent());;ccdc.MoveTo CDC*pDC=GetDlgItem(ID)->GetDC(); HDC hDC=pDC->GetSafeHdc(); GetDlgItem(ID)->GetClientRect(&rect);这几句代码谁能给个比较详细的解释 line(x2-11,y2-1,x2-1,y2-11);/当前正在接收文件的块数hdc=GetDC(hwnd); case WM_LBUTTONDOWN:case WM_RBUTTONDOWN:case WM_MOUSEMOVE:if (wParam & MK_LBUTTON || wParam & MK_RBUTTON)//这是啥意思?{hdc = GetDC (hwnd) ;SelectObject (hdc,GetStockObject (WHITE_PEN)) ;DrawBezier (hdc,apt) ;if (wParam & MK_LBUTTON){apt[1].x = L CDC *pDC=GetDC();具体是什么意思? CDC memdc; CDC* pDC = this->GetDC(); memdc.CreateCompatibleDC(pDC); if(pColor[i]!=SnowCol)big_mem[i]=big_mem[i 1];CDC*pDC=this->GetDC();*q= CDC *p=this->GetDC()是什么意思?请问这个this指针是从哪来的?我记得this指针的作用域是在一个函数的内部,它怎么跑到函数外面去了?在这句代码中,this指针起了什么作用? 如图：Rt三角形BDA中,角BDA=90度,BD=AD,Rt三角形HDC中,角HDC=90度,HD=CD,求证BH=AC图 急!在线等~~C++怎么把图象缩小或放大一倍?HDIB ChangeDIBSize(HDIB hDIB, int nWidth, int nHeight){ LPBITMAPINFO lpbmi = NULL; LPBYTE lpSourceBits, lpTargetBits, lpResult; HDC hDC = NULL, hSourceDC, hTargetDC; HBITMA putimage(x,y,logoBmp7,method);LineTo(hdc,cxClient-10,i);//画棋子tp=p;intx,y; 请看下,我想填充三角形的颜色,Private Declare Sub FloodFill Lib GDI32 (ByVal hDC As Long,ByVal x As Long,ByVal y As Long,ByVal crColor As Long)Public pi,xb As SinglePrivate Sub Form_Load()pi = 3.14159265358979t.Scale (-t.Width / 2,t.Heig MFC不同类型指针销毁是怎么样如 CDC *pDC=GetDC() 销毁方法为 ReleaseDC(pDC);CStatusBar *pSt以及其呢 CHANGE_CONFIG);if(schOpenw[16][16],pixel_save[16][16];voidMous(hdc,i,10,NULL);if(p==NULL)/*开始没有数据*