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i try to pass the following global function pointer to a c library function (cvcamSetProperty) which required the third parameter as callback function pointer.
---------------------------------------------
BOOL CXFaceRecognitionDlg::OnInitDialog()
{
//
// some code had been eliminated
//
// making call the the c library function
cvcamSetProperty(0, CVCAM_PROP_CALLBACK, callback2);
}
void callback2(IplImage* image)
{
}
---------------------------------------------
the compilation stage works fine and no problem at all.
however, when i try to pass the member function pointer, it failed 
---------------------------------------------
BOOL CXFaceRecognitionDlg::OnInitDialog()
{
//
// some code had been eliminated
//
// making call the the c library function
cvcamSetProperty(0, CVCAM_PROP_CALLBACK, &CXFaceRecognitionDlg::callback);
}
void CXFaceRecognitionDlg::callback(IplImage* image)
{
}
---------------------------------------------
here is the error message which i obtain when i try to compile the above code:
D:\Documents and Settings\Administrator\Desktop\XFaceRecognition\XFaceRecognitionDlg.cpp(144) : error C2664: 'cvcamSetProperty' : cannot convert parameter 3 from 'void (__thiscall CXFaceRecognitionDlg::*)(struct _IplImage *)' to 'void *'
There is no context in which this conversion is possible
may i now how can i solve this problem?
thank you.
regards
yccheok
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I think it should be static function, if it is a member of a class(plus check the actual signature it might need to be __cdecl)
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Declare the callback function as static function of the class
class CXFaceRecognitionDlg:: .......
{
:
static void callback(IplImage* image);
:
}
and i think you should not use the & for the call, just use the static function name :
cvcamSetProperty(0, CVCAM_PROP_CALLBACK, CXFaceRecognitionDlg::callback);
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Hi all,
I'm trying to catch WebBrowserEvents from within the toolband. This is basicaly the code im using, but it doesnt seem to work. Has anyone done this before and/or sees what im doing wrong.
class ATL_NO_VTABLE CToolbar :
public CComObjectRootEx<ccomsinglethreadmodel>,
public CComCoClass<ctoolbar, &clsid_toolbar="">,
public IDeskBand,
public IObjectWithSiteImpl<ctoolbar>,
public IInputObject,
public IDispatchImpl<itoolbar, &iid_itoolbar,="" &libid_guciolib="">,
public IDispEventImpl<0, CToolbar, &DIID_DWebBrowserEvents2, &LIBID_SHDocVw, 1, 0>
...
BEGIN_SINK_MAP(CToolbar)
SINK_ENTRY_EX(0, DIID_DWebBrowserEvents2, DISPID_ONFULLSCREEN,OnFullScreen)
SINK_ENTRY_EX(0, DIID_DWebBrowserEvents2, DISPID_BEFORENAVIGATE2, BeforeNavigate2)
END_SINK_MAP()
...
public:
STDMETHOD(OnFullScreen) (BOOL FullScreen);
STDMETHOD(BeforeNavigate2) (LPDISPATCH pDisp , VARIANT* URL,VARIANT* Flags, VARIANT* TargetFrameName,VARIANT* PostData, VARIANT* Headers, BOOL* Cancel);
...
STDMETHODIMP CToolbar::FullScreen(LPDISPATCH pDisp, VARIANT *URL, VARIANT *Flags, VARIANT *TargetFrameName, VARIANT *PostData, VARIANT *Headers, BOOL *Cancel)
{
::MessageBox(NULL,"ONFULLSCREEN event!","IE",MB_OK);
return 0;
}
STDMETHODIMP CToolbar::BeforeNavigate2(LPDISPATCH pDisp, VARIANT *URL, VARIANT *Flags, VARIANT *TargetFrameName, VARIANT *PostData, VARIANT *Headers, BOOL *Cancel)
{
::MessageBox(NULL,"ONBEFORENAVIGATE event!","IE",MB_OK);
return 0;
}
Greeting
snajper
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Hi all,
how can I customize the botton in the windows function MessageBox()?
Is there a class to do this?
Thanks
Piccinaco
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define "customize the button"
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One solution is to design your own simple message dialogbox.
Kuphryn
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No, you get the standard buttons. If you need custom ones, you'll have to make a separate dialog box.
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There is no "official" way to do so, and most people that tried found it easier to "clone" the windows message box, rather than hooking the existing one.
You find a few imlementations on CP.
Clickety[^]
"Der Geist des Kriegers ist erwacht / Ich hab die Macht" StS
sighist | Agile Programming | doxygen
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Been playing around with DnsQuery() but i can't find a way to convert from IP4_ADDRESS to a string.
Hoping you can help me.
ScorpioMidget
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Microsoft provides functions to retrieve the four bytes of the IP adress. So call them one after another, and use a CString or strcat to concatenate the result.
~RaGE();
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Many thanks, i've got it working now.
ScorpioMidget
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Does gethostbyaddr() or inet_ntoa() work for you?
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Not tried them yet, will have a go in a few minutes.
ScorpioMidget
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I have a question regarding a MSComm Control on a simple dialog form with a thread that exits with an error code 0x1.
A new project created with VC++ 6.0 App Wiz, simple dialog, with a MSComm control and a variable mapped to m_Commm and one command button, OpenClose.
In 'OnOpenClose' place:
m_Comm.SetCommPort(1);
m_Comm.SetPortOpen(true);
// Doesn't seem to matter whether I
// put additional code in here or not.
m_Comm.SetPortOpen(false);
While using an external analyzer, I can see that the port in question is opening and closing, in fact with additional code I can send and receive data through this port, but always when I close the port the debug window shows a message that the thread has closed with error code 0x1. As near as I can tell this corresponds to ERROR_INVALID_FUNCTION.
So my question is; Do I actually have an invalid function, or am I misreading the thread error message?
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I have been using MSComm for a while now, and I don't use the .SetPortOpen(FALSE), just let the destructor close it when the application exits. This works fine when I exit the app then sue Hyperterminal etc..
Elaine ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
The tigress is here 
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i recomment not to use mscomm32.ocx,it sometimes does not work well in windows 2k and windows xp,you can use class CSerialPort that can be download from internet
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Hi all,
Is there any way to enum all DCs in a domain, using ADSI or DS API on a win2000 box ???I have already done this sometime ago using NetServerEnum (NETAPI).
- I´ve found DsGetDcOpen/DsGetDcNext but they require Windows XP or later...
- I´ve tried the "Role Property" for IADSComputer Class, but the WinNT and LDAP providers doesn´t suport it...
Thanks in advance
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Question:
Is it possible to hide and to inactivate a button on a dialogbox if a certain condition has occured?
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ShowWindow(SW_HIDE)
EnableWindow(FALSE)
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get access to the button (or other control) inside the dialog (this is the this in the code !)
if its allready exists as a member var, everythings fine ...
myBnt.EnableWindow( FALSE );
myBnt.ShowWindow( SW_HIDE );
if not get its CWnd-Pointer via the controls resource id :
CWnd* pBnt = this->GetDlgItem( IDC_BUTTON1 );
if(pBnt != NULL) pBnt->EnableWindow( FALSE );
if(pBnt != NULL) pBnt->ShowWindow( SW_HIDE );
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Thanks a lot!
Meanwhile I found that it also seems to work with:
myB.ShowWindow(SW_HIDE); and
myB.ShowWindow(SW_SHOWNORMAL);
Is there a difference between myB.ShowWindow(SW_SHOWNORMAL); and
myB.EnableWindow( FALSE );
Another question:
In my application I do not have any 'OK' or 'Cancel' buttons. But if I press the enter button on my keybord the application terminates... and I don't know why.
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Vassili wrote:
Is there a difference between myB.ShowWindow(SW_SHOWNORMAL); and
myB.EnableWindow( FALSE );
Yes.
Vassili wrote:
In my application I do not have any 'OK' or 'Cancel' buttons. But if I press the enter button on my keybord the application terminates... and I don't know why.
Even though you don't have an OnOK() or OnCancel() handler, the defaults are still being called. They, in turn, call EndDialog().
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Vassili wrote:
Is there a difference between myB.ShowWindow(SW_SHOWNORMAL); and
myB.EnableWindow( FALSE );
Yes. ShowWindow will only hide the button, but it will still be there and active, the only thing is you can'T see it. If for some reason, it gets displayed again (Some lost message ..) the user can use it.
EnableWindow really disables the button functionnality.
If you use these functions on a "usual" button (CButton), ShowWindow(SW_HIDE) will make it disappear whereas EnableWindow(False) will make it unclickable and will grey its caption. I think this make clearer the difference between hiding a control and disabling it.
Vassili wrote:
n my application I do not have any 'OK' or 'Cancel' buttons. But if I press the enter button on my keybord the application terminates... and I don't know why.
From Mike Dunn's FAQ : http://www.codeproject.com/cpp/cppforumfaq.asp#mfc_dlgclosekeys[^]
~RaGE();
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