C / C++ / MFC

Re: Detecting that a network cable has been plugged in...

30-Jun-06 5:02

Can you not use the ISensNetwork interface for this?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Eric Dahlvang30-Jun-06 6:12

Eric Dahlvang

30-Jun-06 6:12

Receiving Connection Notifications[^]
Applications interested in receiving advance and after-the-fact notification of connection events must supply a DLL that exports two functions, AddConnectNotify and CancelConnectNotify.

Registering to Receive Connection Notifications [^]
After you have created a DLL to receive connection notifications, you must register it with the system. You do this by adding a REG_EXPAND_SZ value under the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Notifyees key. This value specifies the path to the DLL that implements the Connection Notification API.

--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters

Re: Detecting that a network cable has been plugged in...

David Crow30-Jun-06 6:19

Re: Detecting that a network cable has been plugged in...

30-Jun-06 6:19

Exactly how would AddConnectNotify() or CancelConnectNotify() help in detecting when a network cable has been un/plugged?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Randor 30-Jun-06 7:39

Randor

30-Jun-06 7:39

Apparently you missed the CancelConnectNotify portion of the previous post.

Re: Detecting that a network cable has been plugged in...

David Crow30-Jun-06 9:29

Re: Detecting that a network cable has been plugged in...

30-Jun-06 9:29

Nope, didn't miss it at all. Neither function seems to go with what the OP requested.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Randor 30-Jun-06 13:55

Randor

30-Jun-06 13:55

DavidCrow,

Thanks for the vote of 1, I have returned the favor.

Actually, you should not answer questions if you do not know the answer. In fact, by registering for MPR notifications you can detect connections and disconnections of network resources, including type RESOURCEDISPLAYTYPE_NETWORK which equates to a cat-5 cable being plugged and thus connecting to a network resource.

Here is some sample code:

Enjoy.

<br />
#define UNICODE<br />
#define _UNICODE<br />
<br />
#include <windows.h><br />
#include "npapi.h"<br />
<br />
BOOL FormatAddFlags(DWORD, LPTSTR);<br />
BOOL FormatNetResource(LPNETRESOURCE, LPTSTR);<br />
<br />
DWORD dwCounter = 0;<br />
<br />
BOOL APIENTRY DllMain(HANDLE hModule, DWORD reason, LPVOID lpResv)<br />
{<br />
    return TRUE;<br />
<br />
}<br />
<br />
DWORD APIENTRY AddConnectNotify(LPNOTIFYINFO lpNotifyInfo,<br />
                                LPNOTIFYADD lpAddInfo)<br />
{<br />
<br />
    TCHAR sz[1024], sz1[1024];<br />
<br />
<br />
    if (lpNotifyInfo->dwNotifyStatus == NOTIFY_PRE) {<br />
        lstrcpy(sz, TEXT("Pre-Add:"));<br />
        dwCounter++;<br />
        lpNotifyInfo->lpContext = (VOID *)dwCounter;<br />
    } else if (lpNotifyInfo->dwNotifyStatus == NOTIFY_POST) {<br />
        wsprintf(sz, TEXT("Post-Add (%x):"), <br />
                 lpNotifyInfo->dwOperationStatus);<br />
    } else {<br />
        lstrcpy(sz, TEXT("Other-Add:"));<br />
    }<br />
<br />
    wsprintf(sz1, TEXT("Context=%x"), <br />
             (DWORD)lpNotifyInfo->lpContext);<br />
    lstrcat(sz, sz1);<br />
<br />
    if (FormatAddFlags(lpAddInfo->dwAddFlags, sz1)) {<br />
        lstrcat(sz, sz1);<br />
    }<br />
<br />
<br />
    if (FormatNetResource(&(lpAddInfo->NetResource), sz1)) {<br />
        lstrcat(sz, sz1);<br />
    }<br />
<br />
    MessageBox(lpAddInfo->hwndOwner, sz, TEXT("Connect"), MB_OK);<br />
<br />
    return WN_SUCCESS;<br />
<br />
}<br />
<br />
DWORD APIENTRY CancelConnectNotify(LPNOTIFYINFO lpNotifyInfo,<br />
                                   LPNOTIFYCANCEL lpCancelInfo)<br />
{<br />
<br />
    TCHAR sz[1024], sz1[1024];<br />
<br />
<br />
    if (lpNotifyInfo->dwNotifyStatus == NOTIFY_PRE) {<br />
        lstrcpy(sz, TEXT("Pre-Cancel:"));<br />
        dwCounter++;<br />
        lpNotifyInfo->lpContext = (VOID *)dwCounter;<br />
    } else if (lpNotifyInfo->dwNotifyStatus == NOTIFY_POST) {<br />
         wsprintf(sz, TEXT("Post-Cancel (%x):"), <br />
                 lpNotifyInfo->dwOperationStatus);<br />
    } else {<br />
        lstrcpy(sz, TEXT("Other-Cancel:"));<br />
    }<br />
<br />
    wsprintf(sz1, TEXT("Context=%x"), <br />
             (DWORD)lpNotifyInfo->lpContext);<br />
    lstrcat(sz, sz1);<br />
<br />
    if (lpCancelInfo->lpName != NULL) {<br />
        lstrcat(sz, TEXT(", Name="));<br />
        lstrcat(sz, lpCancelInfo->lpName);<br />
    }<br />
<br />
    if (lpCancelInfo->lpProvider != NULL) {<br />
        lstrcat(sz, TEXT(", Provider="));<br />
        lstrcat(sz, lpCancelInfo->lpProvider);<br />
    }<br />
<br />
    if (lpCancelInfo->dwFlags & CONNECT_UPDATE_PROFILE) {<br />
        lstrcat(sz, TEXT(", Flags=PersistentCancel"));<br />
    } else {<br />
        wsprintf(sz1, TEXT(", Flags=(%x)"), lpCancelInfo->dwFlags);<br />
        lstrcat(sz, sz1);<br />
    }<br />
<br />
    if (lpCancelInfo->fForce) {<br />
        lstrcat(sz, TEXT(", Force=TRUE"));<br />
    } else {<br />
        lstrcat(sz, TEXT(", Force=FALSE"));<br />
    }<br />
<br />
    MessageBox(NULL, sz, TEXT("Connect"), MB_OK);<br />
<br />
    return WN_SUCCESS;<br />
<br />
}<br />
<br />
<br />
BOOL FormatAddFlags(DWORD dwAddFlags, LPTSTR psz)<br />
{<br />
    TCHAR szTemp[MAX_PATH];<br />
<br />
    lstrcpy(psz, TEXT(", AddFlags="));<br />
<br />
    if (dwAddFlags & CONNECT_TEMPORARY) {<br />
        lstrcat(psz, TEXT("Temporary "));<br />
    }<br />
    if (dwAddFlags & CONNECT_INTERACTIVE) {<br />
        lstrcat(psz, TEXT("Interactive "));<br />
    }<br />
    if (dwAddFlags & CONNECT_PROMPT) {<br />
        lstrcat(psz, TEXT("Prompt "));<br />
    }<br />
    if (dwAddFlags & CONNECT_UPDATE_PROFILE) {<br />
        lstrcat(psz, TEXT("UpdateProfile "));<br />
    }        <br />
    if (dwAddFlags & CONNECT_UPDATE_RECENT) {<br />
        lstrcat(psz, TEXT("UpdateRecent "));<br />
    }<br />
<br />
    wsprintf(szTemp, TEXT("(%x)"), dwAddFlags);<br />
    lstrcat(psz, szTemp);<br />
<br />
    <br />
    return TRUE;<br />
<br />
}<br />
<br />
BOOL FormatNetResource(LPNETRESOURCE lpNetResource, LPTSTR psz)<br />
{<br />
<br />
    TCHAR szTemp[MAX_PATH];<br />
<br />
    *psz = 0;<br />
<br />
    // dwScope Field<br />
<br />
    switch(lpNetResource->dwScope) {<br />
    case RESOURCE_CONNECTED:<br />
        lstrcpy(psz, TEXT(", Scope=Connected"));<br />
        break;<br />
<br />
    case RESOURCE_GLOBALNET:<br />
        lstrcpy(psz, TEXT(", Scope=GlobalNet"));<br />
        break;<br />
<br />
    case RESOURCE_CONTEXT:<br />
        lstrcpy(psz, TEXT(", Scope=Context"));<br />
        break;<br />
<br />
    default:<br />
        wsprintf(szTemp, TEXT(", Scope=%x"), lpNetResource->dwScope);<br />
        lstrcpy(psz, szTemp);<br />
        break;<br />
    }<br />
<br />
<br />
    switch(lpNetResource->dwType) {<br />
    case RESOURCETYPE_DISK:<br />
        lstrcat(psz, TEXT(", Type=Disk"));<br />
        break;<br />
<br />
    case RESOURCETYPE_PRINT:<br />
        lstrcat(psz, TEXT(", Type=Printer"));<br />
        break;<br />
<br />
    case RESOURCETYPE_ANY:<br />
        lstrcat(psz, TEXT(", Type=Any"));<br />
        break;<br />
<br />
    default:<br />
        wsprintf(szTemp, TEXT(", Type=%x"), lpNetResource->dwType);<br />
        lstrcat(psz, szTemp);<br />
        break;<br />
    }<br />
<br />
<br />
    switch(lpNetResource->dwDisplayType) {<br />
    case RESOURCEDISPLAYTYPE_NETWORK:<br />
        lstrcat(psz, TEXT(", DisplayType=Network"));<br />
        break;<br />
<br />
    case RESOURCEDISPLAYTYPE_DOMAIN:<br />
        lstrcat(psz, TEXT(", DisplayType=Domain"));<br />
        break;<br />
<br />
    case RESOURCEDISPLAYTYPE_SERVER:<br />
        lstrcat(psz, TEXT(", DisplayType=Server"));<br />
        break;<br />
<br />
    case RESOURCEDISPLAYTYPE_SHARE:<br />
        lstrcat(psz, TEXT(", DisplayType=Share"));<br />
        break;<br />
<br />
    case RESOURCEDISPLAYTYPE_DIRECTORY:<br />
        lstrcat(psz, TEXT(", DisplayType=Directory"));<br />
        break;<br />
<br />
    case RESOURCEDISPLAYTYPE_GENERIC:<br />
        lstrcat(psz, TEXT(", DisplayType=Generic"));<br />
        break;<br />
<br />
    default:<br />
        wsprintf(szTemp, TEXT(", DisplayType=%x"), <br />
                 lpNetResource->dwDisplayType);<br />
        lstrcat(psz, szTemp);<br />
        break;<br />
    }<br />
<br />
<br />
    lstrcat(psz, TEXT(", Usage="));<br />
<br />
    if (lpNetResource->dwUsage & RESOURCEUSAGE_CONNECTABLE) {<br />
        lstrcat(psz, TEXT("Connectable "));<br />
    }<br />
    if (lpNetResource->dwUsage & RESOURCEUSAGE_CONTAINER) {<br />
        lstrcat(psz, TEXT("Container "));<br />
    }<br />
    if (lpNetResource->dwUsage & RESOURCEUSAGE_NOLOCALDEVICE) {<br />
        lstrcat(psz, TEXT("NoLocalDevice "));<br />
    }<br />
    if (lpNetResource->dwUsage & RESOURCEUSAGE_SIBLING) {<br />
        lstrcat(psz, TEXT("Sibling "));<br />
    }<br />
    if (lpNetResource->dwUsage & RESOURCEUSAGE_ATTACHED) {<br />
        lstrcat(psz, TEXT("Attached "));<br />
    }<br />
<br />
    wsprintf(szTemp, TEXT("(%x)"), lpNetResource->dwUsage);<br />
    lstrcat(psz, szTemp);<br />
<br />
<br />
    if (lpNetResource->lpLocalName != NULL) {<br />
        lstrcat(psz, TEXT(", LocalName="));<br />
        lstrcat(psz, lpNetResource->lpLocalName);<br />
    }<br />
<br />
    if (lpNetResource->lpRemoteName != NULL) {<br />
        lstrcat(psz, TEXT(", RemoteName="));<br />
        lstrcat(psz, lpNetResource->lpRemoteName);<br />
    }<br />
<br />
    if (lpNetResource->lpComment != NULL) {<br />
        lstrcat(psz, TEXT(", Comment="));<br />
        lstrcat(psz, lpNetResource->lpComment);<br />
    }<br />
<br />
    if (lpNetResource->lpProvider != NULL) {<br />
        lstrcat(psz, TEXT(", Provider="));<br />
        lstrcat(psz, lpNetResource->lpProvider);<br />
    }<br />
<br />
    return TRUE;<br />
}<br />
<br />

Re: Detecting that a network cable has been plugged in...

David Crow5-Jul-06 2:48

Re: Detecting that a network cable has been plugged in...

5-Jul-06 2:48

Randor wrote:

Thanks for the vote of 1, I have returned the favor.

You have made an erroneous assumption. I do not vote on posts, nor do I care how posts are voted upon. So your vote of 1 has "fallen on deaf ears."

In any case, the documentation indicates that AddConnectNotify() is only called when one of WNetAddConnection(), WNetAddConnection2(), and WNetAddConnection3() is used to add a connection. How would un/connecting a cable simulate the calling of one of those functions?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Eric Dahlvang30-Jun-06 10:47

Eric Dahlvang

30-Jun-06 10:47

DavidCrow wrote:
Exactly how would AddConnectNotify() or CancelConnectNotify() help in detecting when a network cable has been un/plugged?

I've never actually used this stuff...so I'm sure you know much more about it than I do. But, the documentation says:

CancelConnectNotify
The CancelConnectNotify function is implemented by applications that need to receive notification from the MPR when a network resource is connected or disconnected.

Also, I believe that ISensNetwork::ConnectionMade and ISensNetwork::ConnectionLost are only for TCP/IP connections.

--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters

Re: Detecting that a network cable has been plugged in...

David Crow5-Jul-06 2:51

Re: Detecting that a network cable has been plugged in...

5-Jul-06 2:51

EricDV wrote:
But, the documentation says:

CancelConnectNotify
The CancelConnectNotify function is implemented by applications that need to receive notification from the MPR when a network resource is connected or disconnected.

That same documentation states that it is called before and after each cancel connection operation (WNetCancelConnection() or WNetCancelConnection2()). I just don't see how the un/plugging of a cable is going to mimic that.

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Eric Dahlvang5-Jul-06 6:19

Eric Dahlvang

5-Jul-06 6:19

David,

It appears that you are correct. AddConnectNotify and CancelConnectNotify are not called when a network cable is plugged in or unplugged. I tried them out, and notification is only received when an application creates a network connection or disconnects an existing network connection - which has nothing to do with the network cable.

My misunderstanding...I'm stupid.

--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters

Re: Detecting that a network cable has been plugged in...

Justin Tay30-Jun-06 12:06

Justin Tay

30-Jun-06 12:06

You can use WMI for this. Win32_NetworkAdapter's NetConnectionStatus.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win32_networkadapter.asp[^]

Example: Receiving Event Notifications Through WMI
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/example__getting_wmi_data_from_the_local_computer.asp[^]

Getting pointer to ActiveX control object

wrjksdf30-Jun-06 4:19

wrjksdf

30-Jun-06 4:19

Hi,

I am creating a program in Visual Studio 6.0. I am using MFC and Document/View architecture. I add the "Microsoft Web Browser" ActiveX control to the document window. Then I open an HTML document in this window. This HTML document has an embedded ActiveX control object e.g. CExampleActiveXCtl in it. I want to send and receive data to this embedded object from my program. How do I get the pointer to the embedded ActiveX control object?

Any help will be greatly appreciated.

Thank you in advance,

Regards,

RS

Re: Getting pointer to ActiveX control object

Viorel.30-Jun-06 5:25

Viorel.

30-Jun-06 5:25

The only I know is that you can first locate your ActiveX control, which is defined with <OBJECT> element in HTML. You can try such functions like getElementById, getElementsByName or getElementsByTagName, member of IHTMLDocument3. (You can obtain IHTMLDocument3 interface by querying the IDispatch object returned by get_Document function of the WebBrowser control).

After you locate the element, query for IHTMLObjectElement interface. Next you can use get_object member and obtain an IDispatch interface of embedded ActiveX. Then you can query this object for interfaces implemented by the control and manipulate it.

Unfortunately I do not know how you can attach the IDispatch object to an MFC ActiveX control and then work easier with class.

Re: Getting pointer to ActiveX control object

wrjksdf1-Jul-06 19:43

wrjksdf

1-Jul-06 19:43

Thank you very much. That worked!

Regards,

RS

ctime() printing

kitty530-Jun-06 3:58

30-Jun-06 3:58

I'm trying to printout the time and date and i'm doing this:

	<br />
#include <ctime><br />
<br />
char *tm = ctime(NULL);<br />
char *fileName = "";<br />
<br />
fileName = "C:\\output";<br />
strcat(fileName, tm);<br />
strcat(fileName,".txt");<br />
AfxMessageBox(fileName);<br />

but when I run it i get the following error:
Debug Assertion Failed!
ProgramL...
File: ctime64.c
Line: 90

Expression: (timp != NULL)

What am I doing wrong?

Kitty5

Re: ctime() printing [modified]

Cedric Moonen30-Jun-06 4:02

Cedric Moonen

30-Jun-06 4:02

You are messing a little bit how strings works. I suggest you use the strings from the STL (std::string), they will manage all these problems for you.

Cédric Moonen
Software developer

Charting control

Viorel.30-Jun-06 4:08

Viorel.

30-Jun-06 4:08

You did not allocate space for fileName. You can first try this:

char *tm = ctime(NULL);
char fileName[1000];
strcpy(fileName, "C:\\output");
strcat(fileName, tm);
strcat(fileName,".txt");
AfxMessageBox(fileName);

Then you can switch to CString:

CString s;
s.Format("C:\\output%s.txt", ctime(NULL));
AfxMessageBox(s);

And next you can make it work in both Ansi and Unicode versions:

CString s;
s.Format(_T("C:\\output%s.txt"), _tctime(NULL));
AfxMessageBox(s);

I hope it works.

-- modified at 10:10 Friday 30th June, 2006

kitty530-Jun-06 4:29

Re: ctime() printing [modified]

30-Jun-06 4:29

Viorel. wrote:
CString s;
s.Format("C:\\output%s.txt", ctime(NULL));
AfxMessageBox(s);

ok so I tried this but I still have that original error with the ctime() function of:
Debug Assertion Failed!
ProgramL...
File: ctime64.c
Line: 90

Expression: (timp != NULL)

Kitty5

Viorel.30-Jun-06 4:36

Viorel.

30-Jun-06 4:36

This means that ctime does not accept NULL parameter. Try this:

time_t t = time(NULL);

and then path &t to ctime: ctime(&t).

Hope it helps.

-- modified at 10:37 Friday 30th June, 2006

kitty530-Jun-06 5:34

30-Jun-06 5:34

Thanks Viorel!

Kitty5

Jun Du30-Jun-06 4:12

Jun Du

30-Jun-06 4:12

Pass NULL, get NULL. You should code this way:

#include <time.h>
time_t ltime;
time( &ltime );
char *tm = ctime(&ltime);

Best,
Jun

kitty530-Jun-06 4:26

30-Jun-06 4:26

Jun Du wrote:
time_t ltime;
time( <ime );
char="" *tm="ctime(<ime);" <="" blockquote="">

what is