通常情況下，内制的圖檔屬性頁 CLSID_CPicturePropPage能夠滿足需要，但有時候，也許你想有你自己的屬性頁來設定你的圖檔(IPictureDisp)類型的屬性，本文将講述如何做一個圖檔屬性頁
以上文中的例子為例（和上面的例子基本獨立，可以用新的例子來做，隻是懶得弄了）
1.添加Picture屬性（get/set methods，LPPICTUREDISP類型），添加成員變量CPictureHolder m_pic;
LPPICTUREDISP CToppCtrl::GetPicture()
{
// TODO: Add your property handler here
return m_pic.GetPictureDispatch();
return NULL;
}
void CToppCtrl::SetPicture(LPPICTUREDISP newValue)
{
// TODO: Add your property handler here
m_pic.SetPictureDispatch(newValue);
InvalidateControl();
SetModifiedFlag();
}
2.修改OnDraw
void CToppCtrl::OnDraw(
CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid)
{
// TODO: Replace the following code with your own drawing code.
pdc->FillRect(&rcBounds, &CBrush(TranslateColor(m_color)));
m_pic.Render(pdc, rcBounds, rcBounds);
int nhei = 18;
int y = 2;
for(int i=0; i<m_saItems.GetSize(); i++, y+=nhei){
CRect rect(rcBounds.left + 4, y+2, rcBounds.right - 4, y + nhei);
pdc->FillRect(&rect, &CBrush(RGB(255, 255, 255)));
pdc->TextOut(rcBounds.left + 4, y + 2, m_saItems[i]);
}
}
3.修改DoPropExchange，添加"Picture"屬性的持久化
void CToppCtrl::DoPropExchange(CPropExchange* pPX)
{
ExchangeVersion(pPX, MAKELONG(_wVerMinor, _wVerMajor));
COleControl::DoPropExchange(pPX);
// TODO: Call PX_ functions for each persistent custom property.
PX_Color(pPX, "Color", m_color, TranslateColor(RGB(0, 0, 0)));
PX_Picture(pPX, _T("Picture"), m_pic);
PX_Items(pPX);
}
4.建立一對話框資源（OlePropertyPage類型，IDD_PROPPAGE_MYPIC），在上面添加兩按鈕("浏覽"，"清除")，用 ClassWizard建立CMyPicPropPage（派生自COlePropertyPage)，以後就開始編輯CMyPicPropPage這個 屬性頁類了。
5.建立字元串資源IDS_MYPIC_PPG_CAPTION（"圖檔"），将之填入以下兩處，作為屬性頁打進标題（更改屬性頁的标題，就是簡單的更改相應字元串資源的文字就可以了）
CMyPicPropPage::CMyPicPropPage() :
COlePropertyPage(IDD, IDS_MYPIC_PPG_CAPTION)
{
//{{AFX_DATA_INIT(CMyPicPropPage)
// NOTE: ClassWizard will add member initialization here
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_DATA_INIT
}
BOOL CMyPicPropPage::CMyPicPropPageFactory::UpdateRegistry(BOOL bRegister)
{
// TODO: Define string resource for page type; replace '0' below with ID.
if (bRegister)
return AfxOleRegisterPropertyPageClass(AfxGetInstanceHandle(),
m_clsid, IDS_MYPIC_PPG_CAPTION);
else
return AfxOleUnregisterClass(m_clsid, NULL);
}
6.為CMyPicPropPage添加成員CPictureHolder m_pic，用來儲存屬性頁中的圖檔(IPictureDisp)對象
7.添加兩個按鈕的響應函數，在OnButtonBrowser建立圖檔對象(IPictureDisp)，并儲存在m_pic中，在OnButtonClear中則删除圖檔對象。
void CMyPicPropPage::OnButtonBrowser()
{
// TODO: Add your control notification handler code here
CFileDialog dlg(TRUE, "所有檔案|*.*||");
if(dlg.DoModal() == IDOK){
CFile file;
if(file.Open(dlg.GetPathName(), CFile::typeBinary | CFile::modeRead)){
DWORD dwlen = file.GetLength();
HGLOBAL hMem = GlobalAlloc(GMEM_FIXED, dwlen);
file.Read((void*)hMem, dwlen);
file.Close();
LPSTREAM pstream;
CreateStreamOnHGlobal(hMem, TRUE, &pstream);
LPPICTUREDISP ppic = NULL;
OleLoadPicture(pstream, dwlen, TRUE, IID_IPictureDisp, (LPVOID*)&ppic);
if(ppic){
m_pic.SetPictureDispatch(ppic);
}
GlobalFree(hMem);
}
}
}
void CMyPicPropPage::OnButtonClear()
{
// TODO: Add your control notification handler code here
m_pic.CreateEmpty();
}
8.添加WM_PAINT消息響應函數，以在屬性頁上顯示所選的圖檔
void CMyPicPropPage::OnPaint()
{
CPaintDC dc(this); // device context for painting
// TODO: Add your message handler code here
CRect rect;
GetClientRect(&rect);
rect.DeflateRect(10, 10, 200, 10);
m_pic.Render(&dc, rect, rect);
// Do not call COlePropertyPage::OnPaint() for painting messages
}
9.和控件産生關聯，在适當的時候載入控件的Picture屬性到m_pic在和儲存m_pic中的圖檔到控件的Picture屬性：
void CMyPicPropPage::DoDataExchange(CDataExchange* pDX)
{
// NOTE: ClassWizard will add DDP, DDX, and DDV calls here
// DO NOT EDIT what you see in these blocks of generated code !
//{{AFX_DATA_MAP(CMyPicPropPage)
//}}AFX_DATA_MAP
if(pDX->m_bSaveAndValidate){
SetPic();
}
else{
GetPic();
}
DDP_PostProcessing(pDX);
}
void CMyPicPropPage::SetPic()
{
USES_CONVERSION;
COleDispatchDriver PropDispDriver;
ULONG nObjects = 0;
LPDISPATCH* ppDisp = GetObjectArray(&nObjects);
DISPID dwDispID;
LPCOLESTR lpOleStr = T2COLE("Picture");
ppDisp[0]->GetIDsOfNames(IID_NULL, (LPOLESTR*)&lpOleStr, 1, 0, &dwDispID);
PropDispDriver.AttachDispatch(ppDisp[0]);
PropDispDriver.SetProperty(dwDispID, VT_DISPATCH, m_pic.GetPictureDispatch());
PropDispDriver.DetachDispatch();
}
void CMyPicPropPage::GetPic()
{
USES_CONVERSION;
COleDispatchDriver PropDispDriver;
ULONG nObjects = 0;
LPDISPATCH* ppDisp = GetObjectArray(&nObjects);
DISPID dwDispID;
LPCOLESTR lpOleStr = T2COLE("Picture");
ppDisp[0]->GetIDsOfNames(IID_NULL, (LPOLESTR*)&lpOleStr, 1, 0, &dwDispID);
LPPICTUREDISP ppic = NULL;
PropDispDriver.AttachDispatch(ppDisp[0]);
PropDispDriver.GetProperty(dwDispID, VT_DISPATCH, (void*)&ppic);
PropDispDriver.DetachDispatch();
m_pic.SetPictureDispatch(ppic);
}
10.差點忘了一步了，因為是建立了一個屬性頁，不是用預設的屬性頁，是以得告訴控件，你有了哪兩個屬性頁了。
// TODO: Add more property pages as needed. Remember to increase the count!
BEGIN_PROPPAGEIDS(CToppCtrl, 2)
PROPPAGEID(CToppPropPage::guid)
PROPPAGEID(CMyPicPropPage::guid)
END_PROPPAGEIDS(CToppCtrl)
11.可以編譯運作進行測試了
剛知道可以插入圖檔，試試
![處理PCX檔案[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)