C / C++ / MFC Discussion Boards

Re: checking for instance validity

Rajesh R Subramanian15-Feb-08 20:06

Rajesh R Subramanian

15-Feb-08 20:06

Me doing good, Alok. Thanks. Smile | :)

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: checking for instance validity

David Crow15-Feb-08 3:42

David Crow

15-Feb-08 3:42

The whole essence of an object is that it knows about itself. Add an IsValid() method to the class. When that method is invoked, the object can check the validity of each of its members.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: checking for instance validity

rp_suman15-Feb-08 4:41

rp_suman

15-Feb-08 4:41

IsValid () is defined in which class of C++?

Thanks & Regards,
Suman

Re: checking for instance validity

David Crow15-Feb-08 4:49

David Crow

15-Feb-08 4:49

Did you miss the "Add an IsValid() method to the class" part?

Re: checking for instance validity [modified]

rp_suman15-Feb-08 5:41

rp_suman

15-Feb-08 5:41

Hi, so you mean IsValid() is the user defined method?
I have doubt, can we check the object of CStringList is valid like if(object != NULL)?

Thanks & Regards,
Suman

modified on Friday, February 15, 2008 11:51 AM

definition of ITypeInfo

George_George14-Feb-08 21:17

George_George

14-Feb-08 21:17

Hello everyone,

Could anyone post or let me know where is the definition of ITypeInfo please?

(my purpose is to find its inheritance relationship, i.e. whether inherits from IUnknown or something)

I searched all VC sub-directory and only get (in afxstat_.h),

struct ITypeInfo;
typedef ITypeInfo* LPTYPEINFO;

thanks in advance,
George

Re: definition of ITypeInfo

Rajkumar R14-Feb-08 22:00

Rajkumar R

14-Feb-08 22:00

Oaidl.h ?

George_George wrote:
where is the definition of ITypeInfo please

u mean declaration

George_George wrote:
my purpose is to find its inheritance relationship, i.e. whether inherits from IUnknown or something)

yes it inherits from IUnknown

Re: definition of ITypeInfo

George_George14-Feb-08 22:14

George_George

14-Feb-08 22:14

Thanks Rajkumar,

Cool, I have found it from Oaidl.h. I am interested that Oa is short for?

MIDL_INTERFACE("00020401-0000-0000-C000-000000000046")
ITypeInfo : public IUnknown
{
public:
    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetTypeAttr(
        /* [out] */ TYPEATTR **ppTypeAttr) = 0;

    virtual HRESULT STDMETHODCALLTYPE GetTypeComp(
        /* [out] */ ITypeComp **ppTComp) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetFuncDesc(
        /* [in] */ UINT index,
        /* [out] */ FUNCDESC **ppFuncDesc) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetVarDesc(
        /* [in] */ UINT index,
        /* [out] */ VARDESC **ppVarDesc) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetNames(
        /* [in] */ MEMBERID memid,
        /* [length_is][size_is][out] */ BSTR *rgBstrNames,
        /* [in] */ UINT cMaxNames,
        /* [out] */ UINT *pcNames) = 0;

    virtual HRESULT STDMETHODCALLTYPE GetRefTypeOfImplType(
        /* [in] */ UINT index,
        /* [out] */ HREFTYPE *pRefType) = 0;

    virtual HRESULT STDMETHODCALLTYPE GetImplTypeFlags(
        /* [in] */ UINT index,
        /* [out] */ INT *pImplTypeFlags) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetIDsOfNames(
        /* [size_is][in] */ LPOLESTR *rgszNames,
        /* [in] */ UINT cNames,
        /* [size_is][out] */ MEMBERID *pMemId) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE Invoke(
        /* [in] */ PVOID pvInstance,
        /* [in] */ MEMBERID memid,
        /* [in] */ WORD wFlags,
        /* [out][in] */ DISPPARAMS *pDispParams,
        /* [out] */ VARIANT *pVarResult,
        /* [out] */ EXCEPINFO *pExcepInfo,
        /* [out] */ UINT *puArgErr) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetDocumentation(
        /* [in] */ MEMBERID memid,
        /* [out] */ BSTR *pBstrName,
        /* [out] */ BSTR *pBstrDocString,
        /* [out] */ DWORD *pdwHelpContext,
        /* [out] */ BSTR *pBstrHelpFile) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetDllEntry(
        /* [in] */ MEMBERID memid,
        /* [in] */ INVOKEKIND invKind,
        /* [out] */ BSTR *pBstrDllName,
        /* [out] */ BSTR *pBstrName,
        /* [out] */ WORD *pwOrdinal) = 0;

    virtual HRESULT STDMETHODCALLTYPE GetRefTypeInfo(
        /* [in] */ HREFTYPE hRefType,
        /* [out] */ ITypeInfo **ppTInfo) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE AddressOfMember(
        /* [in] */ MEMBERID memid,
        /* [in] */ INVOKEKIND invKind,
        /* [out] */ PVOID *ppv) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE CreateInstance(
        /* [in] */ IUnknown *pUnkOuter,
        /* [in] */ REFIID riid,
        /* [iid_is][out] */ PVOID *ppvObj) = 0;

    virtual HRESULT STDMETHODCALLTYPE GetMops(
        /* [in] */ MEMBERID memid,
        /* [out] */ BSTR *pBstrMops) = 0;

    virtual /* [local] */ HRESULT STDMETHODCALLTYPE GetContainingTypeLib(
        /* [out] */ ITypeLib **ppTLib,
        /* [out] */ UINT *pIndex) = 0;

    virtual /* [local] */ void STDMETHODCALLTYPE ReleaseTypeAttr(
        /* [in] */ TYPEATTR *pTypeAttr) = 0;

    virtual /* [local] */ void STDMETHODCALLTYPE ReleaseFuncDesc(
        /* [in] */ FUNCDESC *pFuncDesc) = 0;

    virtual /* [local] */ void STDMETHODCALLTYPE ReleaseVarDesc(
        /* [in] */ VARDESC *pVarDesc) = 0;

};

regards,
George

Re: definition of ITypeInfo

Rajkumar R14-Feb-08 22:22

Rajkumar R

14-Feb-08 22:22

OA - OLE Automation, not sure Smile | :)

BTW, use bandwidth wisely. I don't think in this context posting code is necessary.

Re: definition of ITypeInfo

George_George14-Feb-08 22:42

George_George

14-Feb-08 22:42

Thanks for your advice, Rajkumar!

Seems you have a lot of experience of COM, how about my another question about IDispatch? Smile | :)

http://www.codeproject.com/script/Forums/View.aspx?fid=1647&msg=2428711[^]

regards,
George

How to Display HTML strings in MFC ?

Sharath Jagannath14-Feb-08 20:37

Sharath Jagannath

14-Feb-08 20:37

How to Display HTML strings in MFC ? Tried it with DHtmlEdit but is it possible to make it read only Smile | :)

. My requirement is display a HTML string but they are not to be edited and i don't want to create a HTML file to use navigate () function of CWebBrowser. Did bit of R&D Smile | :)

but with no result though.

Re: How to Display HTML strings in MFC ?

Rajesh R Subramanian14-Feb-08 20:41

Rajesh R Subramanian

14-Feb-08 20:41

So, what is HTML strings? Do you mean you'd like to display some HTML content?

Re: How to Display HTML strings in MFC ?

Sharath Jagannath14-Feb-08 20:47

Sharath Jagannath

14-Feb-08 20:47

HTML Strings mean, I create HTML Tags in the memory and doesn't want to create an HTML file to display them, I need to display them directly onto a browser and i failed to find out a way. Tried doing the same using WebBrowser2 ActiveX control but it required only Html File path as it's input in Navigate and also tried DHtmlEdit but i was able to edit the contents using it, which is not required

Re: How to Display HTML strings in MFC ?

Sharath Jagannath14-Feb-08 20:48

Sharath Jagannath

14-Feb-08 20:48

and thx for the help Wink | ;)

in advance

Re: How to Display HTML strings in MFC ?

Rajesh R Subramanian14-Feb-08 21:02

Rajesh R Subramanian

14-Feb-08 21:02

See if these articles help you:

XHTMLStatic[^]

XHtmlDraw[^]

Re: How to Display HTML strings in MFC ?

Sharath Jagannath14-Feb-08 21:41

Sharath Jagannath

14-Feb-08 21:41

Thx... that might be useful...

Re: How to Display HTML strings in MFC ?

jjoshua16-Feb-08 17:31

jjoshua

16-Feb-08 17:31

If you can instantiate a web browser control, you can load your content via an IPersistStream interface.

http://msdn2.microsoft.com/en-us/library/aa752047(VS.85).aspx[^]

OnKeyUp() not get invoked

Anu_Bala14-Feb-08 19:07

Anu_Bala

14-Feb-08 19:07

Hi,

In My application,in view window i have made like this..

1.Index Page
2.Introduction
3.Summary..
Like this. And also i have shortcut keys for each page as shift-1,shift-2...

And also i can move to next page by using PageDown. And also i can press the second option(2.Introduction) by mouse and i directly move to the second page.
My actual problem...
If i use pagedown and move to next page (for eg:Introduction page)...Now if i press shift-1,it directly go to Index page.
If i use mouse and move to another page,and then if i press shift-1 it does not go to index page.I mean it does not go to OnKeyUp() function. Why this problem..

Actually i use Glg.dll for this view.
I didnot use on LButtonClick() for mouse action. glg.dll has function for this.
if( gpGView->glg_animation[SCHEPAGENO].m_hWnd )
{
gpGView->glg_animation[SCHEPAGENO].ShowWindow(SW_HIDE);
SCHEPAGENO = iPanNo - 1;
if(SCHEPAGENO -> giGraphicCnt)
SCHEPAGENO = giGraphicCnt;
}
gpVIew is my view class object.
SCHEPAGENO is page number.
Graphiccnt is total no of pages.

Anu

Re: OnKeyUp() not get invoked

Prasanth M V14-Feb-08 23:23

Prasanth M V

14-Feb-08 23:23

Are u using MFC SDI architecture?

U have a view class and u are creating three pages in that view. The View is the parent for the three pages. Am i right?

Plz give some more deatils regarding the application,

Prasanth M V

Abt changing the settings of default keys In Win CE 6.0

Pankaj Kothawade14-Feb-08 18:52

Pankaj Kothawade

14-Feb-08 18:52

Hi to all,
i m working for Win ce 6.0 platform having VS 2005 as a platform builder and SDK as a language...

i m facing the problem regarding the settings of default keys
ie...
when i m creating any menu,then we are using the up down keys to check the pop up items and we are using the Enter key to select any item,
I want to use char keys instead of this keys like 'P','R'....

I hope i'll get the answer...

thnx in advance

Pankaj

encryption in windows mobile [modified]

guru moorthy.k14-Feb-08 18:51

guru moorthy.k

14-Feb-08 18:51

hi
i have a application to encrypt and decrypt data .
it is perfectly working in system .

but when i connect the windows mobile with the system it is not working . any reason????????

i used Cryto Api algorithm

k.guru moorthy

modified on Friday, February 15, 2008 1:31 AM

Re: encryption in windows mobile

Rajesh R Subramanian14-Feb-08 20:27

Rajesh R Subramanian

14-Feb-08 20:27

guru moorthy.k wrote:
not working

What does "not working" mean Confused | :confused:

Threads not working in network

Wamuti14-Feb-08 18:22

Wamuti

14-Feb-08 18:22

Hi guys. I am trying to implement multithreading in a network oriented program. I had a problem when the server would crash when more than one client application connected to it. Thats why i decided to multithread. Now with the threads the client application keeps on saying that the server is not started when i try to connect after catching "WSAECONNREFUSED".

Before i put the threads the program was working just fine only the server crashing problem so i belive it is the server app that has a problem. Below is the code for the worker thread:

//My listening connection
void CServerSocketDlg::OnListen()
{

THREADVALS * pTv = new THREADVALS;// this structure is declared in my .h
AfxBeginThread(AcceptConnection,pTv);

}

UINT AcceptConnection(LPVOID pParam)
{
THREADVALS * pTv = new THREADVALS;
pTv->m_sServerSocket.Listen();
pTv->m_sServerSocket.Accept(pTv->m_sClientSocket);

return 0;
}

//The structure in my .h

typedef struct ACCEPT
{
CMySocket m_sServerSocket,m_sClientSocket;

}THREADVALS;
//Other necessary code in my .h
UINT AcceptConnection(LPVOID pParam);

void Listen();

I have no syntax error it is just refusing to work i dont know why. Please help.

Wamuti: Any man can be an island, but islands to need water around them!
Edmund Burke: No one could make a greater mistake than he who did nothing because he could do only a little.

Re: Threads not working in network

Rajkumar R14-Feb-08 19:08

Rajkumar R

14-Feb-08 19:08

Wamuti wrote:
THREADVALS * pTv = new THREADVALS;//

in this thread arg, CMySocket m_sServerSocket,m_sClientSocket; are new variable, are they intialised correctly, ie; are they set with the connection parameters.

Re: Threads not working in network

Wamuti14-Feb-08 19:52

Wamuti

14-Feb-08 19:52

I am checking them right now but let me ask, the way i have done the threads, is it okay?

Wamuti: Any man can be an island, but islands to need water around them!
Edmund Burke: No one could make a greater mistake than he who did nothing because he could do only a little.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.