RegOpenKeyEx returning strange error - C / C++ / MFC Discussion Boards

Re: GetLastError() :- 1814

CPallini22-Apr-08 23:11

CPallini

22-Apr-08 23:11

Simply make sure the resource is indeed in the image file.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

Always receiving WSAEWOULDBLOCK error

yaminisridaran22-Apr-08 21:00

yaminisridaran

22-Apr-08 21:00

I am trying to receive udp packets which contains video data. I am receiving WSAEWOULDBLOCK error always.Can any one help me

The code is

WSADATA wsaData;

int error = WSAStartup(0x202,&wsaData);

if(error)
return FALSE;

if(wsaData.wVersion != 0x202)
{
WSACleanup();
return FALSE;
}

m_UdpSock=(SOCKET)WSASocket(AF_INET,SOCK_DGRAM,0,NULL,NULL,0);
if(m_UdpSock==INVALID_SOCKET)
return FALSE;

sockaddr_in sockAddrServer;
sockAddrServer.sin_family=AF_INET;
sockAddrServer.sin_port=htons(port_data);
sockAddrServer.sin_addr.s_addr=INADDR_ANY;

// Bind socket to listener address
if(bind(m_UdpSock,(SOCKADDR*)&sockAddrServer,sizeof(sockaddr_in))==SOCKET_ERROR)
{
int y=WSAGetLastError();

printf("Unable to bind socket\n");
return FALSE;
}

// Create WinSock Event object
WSAEVENT eventWinsock=(WSAEVENT)WSACreateEvent();
if(eventWinsock==WSA_INVALID_EVENT)
{
printf("Unable to create winsock event\n");
return FALSE;
}

// Signal WinSock Event on receive packet
if(WSAEventSelect(m_UdpSock,eventWinsock,FD_READ)!=NOERROR)
{
printf("Unable to connect event to socket\n");
return FALSE;
}
while(m_abort)
{
Recvbuf=new char[BUFFER_SIZE];

if(WaitForSingleObject(eventWinsock,INFINITE)== WAIT_OBJECT_0)
{
sockaddr_in sockAddrRecv;
int nSockAddrSize=sizeof(sockaddr_in);

// Packet received
EnterCriticalSection(&m_cs);

int nErr=recvfrom(m_UdpSock,Recvbuf,BUFFER_SIZE,0,(sockaddr*)&sockAddrRecv,&nSockAddrSize);

LeaveCriticalSection(&m_cs);

if(nErr==SOCKET_ERROR)
{
nErr=WSAGetLastError();
if(nErr==WSAEWOULDBLOCK)
{
WSANETWORKEVENTS wsevents;
WSAEnumNetworkEventsm_UdpSock,eventWinsock,&wsevents);
DWORD dwEventId = WaitForSingleObject(eventWinsock,3000);
if(dwEventId == WAIT_TIMEOUT)
continue;
continue;
}

}

else
{
TRACE("Receive Data Size %d\n",nErr);

BYTE init=Recvbuf[0];

TRACE("Packet Size for Init %d =%d and index=%d \n",init, nErr,index);

}

Re: Always receiving WSAEWOULDBLOCK error [modified]

Mark Salsbery22-Apr-08 21:06

Mark Salsbery

22-Apr-08 21:06

WSACreateEvent() creates a manual reset event, but I don't see anywhere
that you reset the event after waiting on it. Without resetting it,
you end up in a busy loop in between received datagrams.

*edit* Your WSAEnumNetworkEvents() call resets the event, but only every <br />
other time through the loop.  You'll probably want to fix the logic there :)<br />
Either use an auto-rest event or always call WSAEnumNetworkEvents() after the event<br />
is signaled, not just if there's a WSAEWOULDBLOCK error.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

modified on Wednesday, April 23, 2008 3:36 AM

Re: Always receiving WSAEWOULDBLOCK error

yaminisridaran22-Apr-08 21:40

yaminisridaran

22-Apr-08 21:40

How to reset please explain

Re: Always receiving WSAEWOULDBLOCK error

Mark Salsbery22-Apr-08 21:41

Mark Salsbery

22-Apr-08 21:41

See my modified post Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

problem with gridctrl_demo225

sunny_vc22-Apr-08 20:55

sunny_vc

22-Apr-08 20:55

Hi,
I am just trying to execute the gridctrl_demo225 project.
But it is showing an error like "unsupport operation was attempted".
This error is in both unicode and normal configurations.
Please help me in knowing the problem.

Thanks in advance.
Sunil.

Re: problem with gridctrl_demo225

Rajesh R Subramanian22-Apr-08 23:57

Rajesh R Subramanian

22-Apr-08 23:57

Probably some DDX/DDV issue?

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

RegOpenKeyEx returning strange error

vipin_nvk22-Apr-08 20:43

vipin_nvk

22-Apr-08 20:43

I have been trying to open particular registry key to know the version of Outlook currently installed on the PC. Here is the piece of code

HKEY hKey;
CString strKey = _T("Outlook.Application\\CurVer");

if (::RegOpenKeyEx(HKEY_CLASSES_ROOT, strKey, 0, KEY_READ, &hKey) == ERROR_SUCCESS)
{
// do something
}
else
{
DWORD dwError = GetLastError();
}

The above piece of code fails to open the registry key and the GetLastError() returns error no. 122 which says "The data area passed to the system call is too small"

I have administrative privilege on the PC, but this piece of code fails to open the key, what could be the reason, and how do I interpret the error returned?

Thanx.

Re: RegOpenKeyEx returning strange error

Jhony george22-Apr-08 20:51

Jhony george

22-Apr-08 20:51

vipin_nvk wrote:
if (::RegOpenKeyEx(HKEY_CLASSES_ROOT, strKey, 0, KEY_READ, &hKey) == ERROR_SUCCESS)

Change the parameter value instead of "KEY_READ" give "KEY_ALL_ACCESS"...

I'm not sure,whther this will work ..but try...

Born to win...!

Re: RegOpenKeyEx returning strange error

vipin_nvk22-Apr-08 21:15

vipin_nvk

22-Apr-08 21:15

This piece of code works fine at my place but fails with the above mentioned error at the client's place, so I wanted to know as to what could lead to the ERROR_INSUFFICIENT_BUFFER error so that it can be fixed and then sent across to the client. Do you think changing access to KEY_ALL_ACCESS will really work?

Re: RegOpenKeyEx returning strange error

Jhony george22-Apr-08 21:22

Jhony george

22-Apr-08 21:22

vipin_nvk wrote:
Do you think changing access to KEY_ALL_ACCESS will really work?

No, the changing key access ...it wont solve ur problem..
It's something related to other problem... Frown | :(

Born to win...!

Re: RegOpenKeyEx returning strange error

Rajesh R Subramanian23-Apr-08 0:00

Rajesh R Subramanian

23-Apr-08 0:00

Manivannan@congruent wrote:
Change the parameter value instead of "KEY_READ" give "KEY_ALL_ACCESS"...

As a matter of fact, that is a very bad suggestion. You should open a registry key only with the privileges that you may actually need.

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

Re: RegOpenKeyEx returning strange error

David Crow23-Apr-08 3:42

David Crow

23-Apr-08 3:42

Have you tried:

HKEY hKey;
 
LONG lResult = ::RegOpenKeyEx(HKEY_CLASSES_ROOT, _T("Outlook.Application\\CurVer"), 0, KEY_READ, &hKey);
if (lResult == ERROR_SUCCESS)
{
    // do something
}
else
{
    LPVOID lpMsgBuf;
 
    FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                  NULL,
                  lResult,
                  MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                  (LPTSTR) &lpMsgBuf,
                  0,
                  NULL);
    ...
    LocalFree(lpMsgBuf);
}

"Love people and use things, not love things and use people." - Unknown

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

dll problem

prithaa22-Apr-08 20:25

prithaa

22-Apr-08 20:25

Hello,

If my classes work fine and now I make dll's of the same then the classes give me Unhandled Exception.Is there anything that doesn't work if dll's are made?

Regards
Pritha

Re: dll problem

Cedric Moonen22-Apr-08 20:43

Cedric Moonen

22-Apr-08 20:43

Did you try debugging to see what the exact problem is ?

Cédric Moonen
Software developer

Charting control [v1.4 - Updated]

Re: dll problem

prithaa22-Apr-08 21:11

prithaa

22-Apr-08 21:11

Hello,

Yes I have made my menu without using resourses which works fine with my classes without dlls but with dlls the application cannot find the parent Mneu so it cannot replace the new menu

Pritha

EM_CHARFROMPOS for CRichEditCtrl

prithaa22-Apr-08 20:23

prithaa

22-Apr-08 20:23

Hello,

I have a class derived from CRichEditCtrl.
class CRICH : public CRichEditCtrl
{
}
In The above class I have a function
CRICH::GetCharPos()
{
SendMessage(EM_CHARFROMPOS,WPARAM ,LPARAM (5));
}

The above gives me Unhandled Exception but if I derive from CEdit I get the answer

What should I do to get the character position index from CPoint in CRichEditCtrl

Thanks

Pritha

Re: EM_CHARFROMPOS for CRichEditCtrlp[modified]

Naveen22-Apr-08 20:51

Naveen

22-Apr-08 20:51

prithaa wrote:
SendMessage(EM_CHARFROMPOS,WPARAM ,LPARAM (5));

As per MSDN, the LPARAM is a pointer to POINTL structure. so you should modify the code as..

POINTL pt;
pt.x = 5;
pt.y= 5;
SendMessage(EM_CHARFROMPOS,0,LPARAM(&pt));

nave

[OpenedFileFinder]

modified on Wednesday, April 23, 2008 2:57 AM

Re: EM_CHARFROMPOS for CRichEditCtrl

prithaa22-Apr-08 21:09

prithaa

22-Apr-08 21:09

Hello,

WIll this work for CRichEditCtrl

Pritha

Re: EM_CHARFROMPOS for CRichEditCtrl

Naveen22-Apr-08 21:15

Naveen

22-Apr-08 21:15

prithaa wrote:
WIll this work for CRichEditCtrl

Is it very hard to try in your application???

MSDN:

Parameters

wParam
    This parameter is not used. 
lParam
     The coordinates of a point in the control's client area. 
     The coordinates are in screen units and are relative to the upper-left 
     corner of the control's client area. 

Rich edit controls: A pointer to a POINTL structure that contains the 
                       horizontal and vertical coordinates. 

Edit controls: The low-order word contains the horizontal coordinate.
               The high-order word contains the vertical coordinate.

nave

[OpenedFileFinder]

Re: EM_CHARFROMPOS for CRichEditCtrl

David Crow23-Apr-08 3:46

David Crow

23-Apr-08 3:46

prithaa wrote:
SendMessage(EM_CHARFROMPOS,WPARAM ,LPARAM (5));

Why are you not calling the base class implementation instead?

"Love people and use things, not love things and use people." - Unknown

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

Re: EM_CHARFROMPOS for CRichEditCtrl

prithaa24-Apr-08 6:50

prithaa

24-Apr-08 6:50

Thanks Naveen
It worked.
Thanks for everybody's help

Basic concept of making a extractor

neha.agarwal2722-Apr-08 19:46

neha.agarwal27

22-Apr-08 19:46

Hi all,

i want to make a extractor, but actually not getting the concept how to make it......

i have seen various codes on codeproject and code guru, but i don't want code i want concept of extractor.....

can anybody help me in this....

Thanks in advance...

Re: Basic concept of making a extractor

Cedric Moonen22-Apr-08 20:06

Cedric Moonen

22-Apr-08 20:06

An extractor ? What do you mean with that ? Care to explain a bit the context ? Confused | :confused:

Cédric Moonen
Software developer

Charting control [v1.4 - Updated]

Re: Basic concept of making a extractor

neha.agarwal2722-Apr-08 20:12

neha.agarwal27

22-Apr-08 20:12

Actually i want to make a single .exe of various file (like .exe,.txt,.dll)it can be using any extension, and when i click on that exe it should extract all the files back to a location....

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