對於create的dc應該予以deletedc，而對於getdc的應予以releasedc

一、CDC *pDC = GetDC();

CPen pen(PS_SOLID, 2, RGB(0,0,255));

pDC->SelectObject(&pen);

pDC->MoveTo(10, 10);

pDC->LineTo(500, 450);

ReleaseDC(pDC);

二、

CClientDC dc(this);

CDC dcCompatible;

dcCompatible.CreateCompatibleDC(&dc);

dcCompatible.SelectObject(&m_bitmap);

pMemDC->BitBlt(m_rcWindowRect.left, m_rcWindowRect.top, m_rcWindowRect.Width(), m_rcWindowRect.Heigh(), &dcCompatible, 0, 0, SRCCOPY);

pMemDC->StretchBlt(m_rcWindowRect.left, m_rcWindowRect.top, m_rcWindowRect.Width(), m_rcWindowRect.Height(), &dcCompatible, 0, 0, bmp.bmWidth, bmp.bmHeight, SRCCOPY);

DeleteDC(dcCompatible);

三、

CPaintDC dc(this);

//CPaintDC只在OnPaint函式裡有效。

HDC hDC;

CDC *pDC = m_pParentDlg->GetDC();

hDC = CreateCompatibleDC(pDC->GetSafeHdc());

HGDIOBJ  hOldBmp = SelectObject(hDC, m_hbitmap);

StretchBlt(pDC->m_hDC, 535, 70, 200, 150, hDC, 0, 0, m_tuwidth, m_tuheight, SRCCOPY);

SelectObject(hDC, hOldBmp);

DeleteDC(hDC);

m_pParentDlg->ReleaseDC(pDC);

wince從檔案裡面載入bmp格式圖片：（要包含標頭檔案ShellAPI.h）

#include <ShellAPI.h>HBITMAP hmap;

hmap = SHLoadDIBitmap(_T("\\SDMMC\\Test\\kenan.bmp"));

CDC dcCompatible;dcCompatible.CreateCompatibleDC(pMemDC);

SelectObject(dcCompatible, hmap);

BitBlt(pMemDC->m_hDC, m_rcWindowRect.left, m_rcWindowRect.top, m_rcWindowRect.Width(), m_rcWindowRect.Height(), dcCompatible, 0, 0, SRCCOPY);

DeleteDC(dcCompatible)