问
自编浏览器进入一个网页后,点一个链接后系统自动调用用IE打开网页而不是用自身浏览器打开网页。如何让窗口用我自己的浏览器打开？
答
http://www.csdn.net/develop/read_article.asp?id=21702
控制新的窗口
默认情况下，浏览器收到创建新窗口请求时，会在IE中打开新的窗口。你可以处理NewWindow2事件来在自己指定的窗口中打开请求的页面。
问：
如何枚举系统中视频捕获设备(摄像头)的设备名称
答：
以下代码来 自DirectX9 SDK中的AMCAP示例
// put all installed video and audio devices in the menus
//
void AddDevicesToMenu()
{
……
// enumerate all video capture devices
ICreateDevEnum *pCreateDevEnum=0;
hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER,
IID_ICreateDevEnum, (void **)&pCreateDevEnum);
if (hr != NOERROR)
{
ErrMsg(TEXT("Error Creating Device Enumerator" ));
return ;
}
IEnumMoniker *pEm=0;
hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0);
if (hr != NOERROR)
{
ErrMsg(TEXT("Sorry, you have no video capture hardware./r/n/r/n" )
TEXT("Video capture will not function properly." ));
goto EnumAudio;
}
pEm->Reset();
ULONG cFetched;
IMoniker *pM;
while (hr = pEm->Next(1, &pM, &cFetched), hr==S_OK)
{
IPropertyBag *pBag=0;
hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pBag);
if (SUCCEEDED(hr))
{
VARIANT var;
var.vt = VT_BSTR;
hr = pBag->Read(L"FriendlyName" , &var, NULL);
if (hr == NOERROR)
{
AppendMenu(hMenuSub, MF_STRING, MENU_VDEVICE0 + uIndex,
W2T(var.bstrVal));
if (gcap.pmVideo != 0 && (S_OK == gcap.pmVideo->IsEqual(pM)))
bCheck = TRUE;
CheckMenuItem(hMenuSub, MENU_VDEVICE0 + uIndex,
(bCheck ? MF_CHECKED : MF_UNCHECKED));
EnableMenuItem(hMenuSub, MENU_VDEVICE0 + uIndex,
(gcap.fCapturing ? MF_DISABLED : MF_ENABLED));
bCheck = FALSE;
SysFreeString(var.bstrVal);
ASSERT(gcap.rgpmVideoMenu[uIndex] == 0);
gcap.rgpmVideoMenu[uIndex] = pM;
pM->AddRef();
}
pBag->Release();
}
pM->Release();
uIndex++;
}
pEm->Release();
问：
我目前使用 BCG 中的 CBCGPPropList 来实现某一个东西的属性，可是有一项数据特别大，大约500个字符，我希望能把这一项的高度调整可是不知道如何处理，不知道能单独调整其中一项吗
答：从CBCGPProp派生一个函数，重载OnEdit并在其中创建一个需要的大小的编辑框。最后Add自定义的prop类对象。具体实现可以参照CBCGPColorProp和CBCGPFontProp类的实现
问：我想实现一个功能，就是检测一个目录或文件，看它是否存在，如果不存在就创建这个目录或文件。
答：
可以用Win32文件查找来查找文件或者文件夹是否存在，也可以用PathFileExists来判断。GetFileAttributes和 PathIsDirectory可以用于判断文件是否是目录。创建文件可以用CreateDirectory或者 MakeSureDirectoryPathExists。
bool FileExists(CString FileName)
{
WIN32_FIND_DATA FindFileData;
HANDLE hFind;
bool FindFlag = false ;
hFind = FindFirstFile(FileName , &FindFileData);
if (hFind == INVALID_HANDLE_VALUE)
{
FindFlag = false ;
}
else
{
FindFlag = true ;
}
FindClose(hFind);
return FindFlag;
}
DWORD dwFlag = GetFileAttributes(pathname);
if ( 0xFFFFFFFF == dwFlag ) 不存在；
if ( FILE_ATTRIBUTE_DIRECTORY & dwFlag ) 是文件夹
else 是文件
问：
请教一下，html中如果已知Activex的classid，有什么办法可以直接找到它？ 通过id来查找比较慢，所以问一下可否通过这种方式？取得IOleObject之后，我需要如何做才可以调用Activex控件中的函数呢？
答：
由于控件所在容器是HTMLDocument对象，你可以用IOleContainer::EnumObjects枚举里面的OLE对象，包括控件和框架
IOleContainer* pContainer;
// Get the container
HRESULT hr = pHtmlDoc2->QueryInterface(IID_IOleContainer,
(void **)&pContainer);
lpDisp->Release();
if (FAILED(hr))
return hr;
IEnumUnknown* pEnumerator;
// Get an enumerator for the frames
hr = pContainer->EnumObjects(OLECONTF_EMBEDDINGS, &pEnumerator);
pContainer->Release();
if (FAILED(hr))
return hr;
IUnknown* pUnk;
ULONG uFetched;
// Enumerate and refresh all the frames
for (UINT i = 0; S_OK == pEnumerator->Next(1, &pUnk, &uFetched); i++)
{
// QI for IOleObject here to see if we have an embedded browser
IOleObject* pOleObject;
hr = pUnk->QueryInterface(IID_IOleObject, (void **)&pOleObject);
pUnk->Release();
if (SUCCEEDED(hr))
{
CLSID clsID;
pOleObject->GetUserClassID(&clsID);
}
}
pEnumerator->Release();
控件的IOleObject接口是用来查询控件的CLSID的。你应该查询控件的IDispatch接口，然后按照http://www.csdn.net/develop/read_article.asp?id=14752 里面的方法调用其属性和方法。
问：
已知PIDL怎么得到他对应的IShellFolder指针呢
答：用SHBindtoParent就可以了
IShellFolder *psfParent; //A pointer to the parent folder object's IShellFolder interface
LPITEMIDLIST pidlItem = NULL; //the item's PIDL
LPITEMIDLIST pidlRelative = NULL; //the item's PIDL relative to the parent folder
STRRET str; //the display name's STRRET structure
TCHAR szDisplayName[MAX_PATH]; //the display name's string
HRESULT hres = SHBindToParent(pidlItem, IID_IShellFolder, &psfParent, &pidlRelative);
if (SUCCEEDED(hres))
{
psfParent->GetDisplayNameOf(pidlRelative, SHGDN_NORMAL, &str);
psfParent->Release();
StrRetToBuf(&str, pidlItem, szDisplayName, ARRAYSIZE(szDisplayName));
}
问：如何handle IE的textsize changed event? 我想在用户改变text size 时做些处理，请问该如何handle，在哪个事件中做？谢谢指教。
答：sink HtmlDocument对象的IOleCommandTaget接口。
问： IStream *pStream; CString mString; 怎么样才能把pStream的内容赋给mString呢？
答：下面的代码把一个内存流读到字节数组。你可以根据字符串的类型把字节数组转化成字符串。
COleStreamFile osfRead;
osfRead.Attach(pStream);
long lLength=osfRead.GetLength();
CByteArray baBuf;
baBuf.SetSize(lLength);
osfRead.Read(baBuf.GetData(),lLength);
问：我Create了一个ListControl用来显示文件列表？怎么实现有图标的文件显示阿？
答：SHGetFileInfo可以返回系统图像列表，里面包含每一种文件类型的图标。参见http://www.csdn.net/develop/read_article.asp?id=22243
问题：如何编写无界面的HTML解析器？
答：walkall示例就是一个无界面的HTML解析器。
问：用AfxBeginThread创建的线程除了调用AfxEndThread还可以用什么函数关闭？
答：
可以从外部用事件通知来优雅地结束线程
启动线程m_pThreadWrite=AfxBeginThread(ThreadProc,(LPVOID)this);
线程体。为了避免在静态函数中引用对象指针的麻烦，调用对象参数的线程体成员函数。
UINT CMyClass::ThreadProc(LPVOID lp)
{
CMicrophoneInput* pInput = (CMicrophoneInput*)lp;
return pInput->Run();
}
简单的循环检测退出标志
UINT CMyClass::Run()
{
HRESULT hr;
if (!InitInstance())
{
TRACE("InitInstance failed/r/n" ;
return ExitInstance();
}
while (!IsKilling())
{
//do something
}
return ExitInstance();
}
重设退出标志
BOOL CMyClass::InitInstance()
{
m_eventKill.ResetEvent();
m_eventDead.ResetEvent();
//do something
return TRUE
}
设已退出标志
UINT CMyClass::ExitInstance()
{
//do something
m_eventDead.SetEvent();
return 0;
}
检查退出标志
BOOL CMyClass::IsDead()
{
return WaitForSingleObject(m_eventDead, 0) == WAIT_OBJECT_0;
}
BOOL CMyClass::IsKilling()
{
return WaitForSingleObject(m_eventKill, 0) == WAIT_OBJECT_0;
}
在外部可以这样终止线程
//check if dead
if (!IsDead()&&m_pThreadWrite!=NULL){
m_eventKill.SetEvent();
WaitForSingleObject(m_eventDead,INFINITE);
m_pThreadWrite=NULL;
}
问：怎么实现IEnumString接口？
答：http://www.codeproject.com/wtl/customautocomplete_wtl.asp
IAutoComplete and custom IEnumString implementation for WTL dialogs
下面是我的基于数据库的IEnumString实现
if !defined(AFX_ENUMSTRING_H__4D5D61AD_CD0D_477C_880F_8E5EEB5B1E8F__INCLUDED_)
#define AFX_ENUMSTRING_H__4D5D61AD_CD0D_477C_880F_8E5EEB5B1E8F__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// EnumString.h : header file
//
//////////////////////////////////////////////////////////
// CEnumString command target
#include
#include "esuihelper.h"
class _ES_UI_EXPORT CEnumString : public IEnumString
{
public :
CEnumString(); // protected constructor used by dynamic creation
// Attributes
public :
ULONG m_nRefCount;
// Operations
public :
STDMETHODIMP_(ULONG ) AddRef();
STDMETHODIMP_(ULONG ) Release();
STDMETHODIMP QueryInterface(REFIID riid, void ** ppvObject);
STDMETHODIMP Next(ULONG celt, LPOLESTR* rgelt, ULONG * pceltFetched);
STDMETHODIMP Skip(ULONG celt);
STDMETHODIMP Reset(void );
STDMETHODIMP Clone(IEnumString** ppenum);
BOOL Bind(HWND p_hWndEdit, DWORD p_dwOptions = 0, LPCTSTR p_lpszFormatString = NULL);
VOID Unbind();
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CEnumString)
//}}AFX_VIRTUAL
// Implementation
protected :
virtual ~CEnumString();
CComPtr m_pac;
BOOL m_fBound;
// Generated message map functions
//{{AFX_MSG(CEnumString)
// NOTE - the ClassWizard will add and remove member functions here.
//}}AFX_MSG
};
/////////////////////////////////////////////////////////////
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_ENUMSTRING_H__4D5D61AD_CD0D_477C_880F_8E5EEB5B1E8F__INCLUDED_)
// EnumString.cpp : implementation file
//
#include "stdafx.h"
#include "EnumString.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////
// CEnumString
CEnumString::CEnumString()
{
m_fBound = FALSE;
m_nRefCount = 0;
}
CEnumString::~CEnumString()
{
}
/////////////////////////////////////////////////////////////
// CEnumString message handlers
ULONG FAR EXPORT CEnumString::AddRef()
{
TRACE_LINE("CEnumString::AddRef/n" );
return ::InterlockedIncrement(reinterpret_cast <LONG *>(&m_nRefCount));
}
ULONG FAR EXPORT CEnumString::Release()
{
TRACE_LINE("CEnumString::Release/n" );
ULONG nCount = 0;
nCount = (ULONG ) ::InterlockedDecrement(reinterpret_cast <LONG *>(&m_nRefCount));
if (nCount == 0)
delete this ;
return nCount;
}
HRESULT FAR EXPORT CEnumString::QueryInterface(
REFIID riid, void FAR* FAR* ppvObject )
{
HRESULT hr = E_NOINTERFACE;
if (ppvObject != NULL)
{
*ppvObject = NULL;
if (IID_IUnknown == riid)
*ppvObject = static_cast (this );
if (IID_IEnumString == riid)
*ppvObject = static_cast (this );
if (*ppvObject != NULL)
{
hr = S_OK;
((LPUNKNOWN)*ppvObject)->AddRef();
}
}
else
{
hr = E_POINTER;
}
return hr;
}
STDMETHODIMP CEnumString::Next(ULONG celt, LPOLESTR* rgelt, ULONG * pceltFetched)
{
return E_NOTIMPL;
}
STDMETHODIMP CEnumString::Skip(ULONG celt)
{
return E_NOTIMPL;
}
STDMETHODIMP CEnumString::Reset(void )
{
return E_NOTIMPL;
}
STDMETHODIMP CEnumString::Clone(IEnumString** ppenum)
{
if (!ppenum)
return E_POINTER;
CEnumString* pnew = new CEnumString;
pnew->AddRef();
*ppenum = pnew;
return S_OK;
}
BOOL CEnumString::Bind(HWND p_hWndEdit, DWORD p_dwOptions /*= 0-*/ , LPCTSTR p_lpszFormatString /*= NULL*/ )
{
if ((m_fBound) || (m_pac))
return FALSE;
HRESULT hr = S_OK;
hr = m_pac.CoCreateInstance(CLSID_AutoComplete);
if (SUCCEEDED(hr))
{
if (p_dwOptions)
{
CComQIPtr pAC2(m_pac);
ATLASSERT(pAC2);
hr = pAC2->SetOptions(p_dwOptions); // This never fails?
pAC2.Release();
}
hr = m_pac->Init(p_hWndEdit, this , NULL, (LPOLESTR)p_lpszFormatString);
if (SUCCEEDED(hr))
{
m_fBound = TRUE;
return TRUE;
}
}
return FALSE;
}
VOID CEnumString::Unbind()
{
if (!m_fBound)
return ;
ATLASSERT(m_pac);
if (m_pac)
{
m_pac.Release();
m_fBound = FALSE;
}
}
#include "../esuihelper/EnumString.h"
#include "DataType.h"
class CDataType;
class _ES_DATATYPE_EXPORT CEnumDataType : public CEnumString
{
public :
CEnumDataType(LPCTSTR lpszDataType);
virtual ~CEnumDataType();
CDataType* m_pDataType;
protected :
CString m_strDataType;
STDMETHODIMP Next(ULONG celt, LPOLESTR* rgelt, ULONG * pceltFetched);
STDMETHODIMP Skip(ULONG celt);
STDMETHODIMP Reset(void );
STDMETHODIMP Clone(IEnumString** ppenum);
ado20::_RecordsetPtr m_pRecordset;
};
CEnumDataType::CEnumDataType(LPCTSTR lpszDataType)
: m_strDataType(lpszDataType)
{
m_pDataType = g_pDataTypeManager->GetDataType(m_strDataType);
ASSERT(m_pDataType);
m_pRecordset.CreateInstance("ADODB.Recordset" );
try
{
if (m_pRecordset != NULL)
{
if ( m_pRecordset->State&adStateOpen)
{
return ;
}
}
ESRecordsetOpen((LPCTSTR )m_pDataType->m_strSQLAutoComplete, _variant_t((IDispatch *)g_connection, true ),
m_pRecordset, adOpenDynamic, adLockOptimistic, adCmdUnspecified);
m_pRecordset->Requery(adCmdUnknown);
if (m_pRecordset->BOF == VARIANT_FALSE)
m_pRecordset->MoveFirst();
}
catch (_com_error &e)
{
ESErrPrintProviderError(g_connection);
ESErrPrintComError(e);
}
}
CEnumDataType::~CEnumDataType()
{
try
{
if (m_pRecordset != NULL)
{
if ( m_pRecordset->State&adStateOpen)
{
m_pRecordset->Close();
}
}
}
catch (_com_error &e)
{
ESErrPrintProviderError(g_connection);
ESErrPrintComError(e);
}
}
STDMETHODIMP CEnumDataType::Next(ULONG celt, LPOLESTR* rgelt, ULONG * pceltFetched)
{
if (m_pRecordset == NULL) return OLE_E_BLANK;
HRESULT hr = S_FALSE;
ZeroMemory(rgelt, sizeof (OLECHAR*) * celt);
try
{
if (!celt) celt = 1;
for (ULONG i = 0; i < celt; i++)
{
if (m_pRecordset->EndOfFile == VARIANT_TRUE)
break ;
_bstr_t bstrText =
(LPCTSTR )g_GetValueString(
m_pRecordset->Fields->Item[(LPCTSTR )m_pDataType->m_strAutoCompleteField]->Value);
if (bstrText.length() > 0)
{
rgelt[i] = OLESTRDUP(bstrText);
if (pceltFetched)
*pceltFetched++;
}
m_pRecordset->MoveNext();
}
if (i == celt)
hr = S_OK;
}
catch (_com_error &e)
{
ESErrPrintProviderError(g_connection);
ESErrPrintComError(e);
return e.Error();
}
return hr;
}
STDMETHODIMP CEnumDataType::Skip(ULONG celt)
{
if (m_pRecordset == NULL) return OLE_E_BLANK;
try
{
m_pRecordset->Move(celt, (long )adBookmarkCurrent);
}
catch (_com_error &e)
{
ESErrPrintProviderError(g_connection);
ESErrPrintComError(e);
return e.Error();
}
return S_OK;
}
STDMETHODIMP CEnumDataType::Reset(void )
{
if (m_pRecordset == NULL) return OLE_E_BLANK;
try
{
m_pRecordset->Requery(adCmdUnknown);
if (m_pRecordset->BOF == VARIANT_FALSE)
m_pRecordset->MoveFirst();
}
catch (_com_error &e)
{
ESErrPrintProviderError(g_connection);
ESErrPrintComError(e);
return e.Error();
}
return S_OK;
}
STDMETHODIMP CEnumDataType::Clone(IEnumString** ppenum)
{
if (!ppenum)
return E_POINTER;
CEnumDataType* pnew = new CEnumDataType(m_strDataType);
pnew->AddRef();
*ppenum = pnew;
return S_OK;
}
