C / C++ / MFC

Re: Serialization questions

3-Nov-03 4:35

I have two questions pertaining to serialization.

I have nested classes but want save each class into seperate files how do go about doing this

If want to able to open files in range of different extensions e.g *.csv, *.prn and *.txt. How is this achieved?

Steve S3-Nov-03 22:59

Steve S

3-Nov-03 22:59

1. Using MFC serialisation mechanisms, you don't. The assumption is made that a single file will contain the entire document. Indeed, use is made of a 'class dictionary' within an MFC archive file, unless you redo the serialisation from scratch.

2. There's a KB article (141921) which covers this nicely.

Steve S

Overloading the << and >> operators CArchive

Alton Williams3-Nov-03 4:27

Re: Overloading the << and >> operators CArchive

3-Nov-03 4:27

I know to code it to return an object of ostream &, istream & or the classes that derived from them.

But how do you do it to return a reference to a CArchive?
Alton

Steve S3-Nov-03 22:55

Steve S

3-Nov-03 22:55

If you're overloading the << and >> operators, chances are that you also have a CArchive& parameter. Simply return that.

Usually you'll have something like

<br />
   friend CArchive& operator<<( CArchive& ar, myObj obj);<br />
   friend CArchive& operator>>( CArchive& ar, myObj& obj);<br />

inside your class declaration for myObj.
So when you implement

<br />
CArchive& operator<<( CArchive& ar, myObj obj)<br />
{<br />
   // Output your member data here or whatever<br />
   ...<br />
   return ar;<br />
}<br />

and similarly for the operator>> function.

Steve S

Re: Overloading the << and >> operators CArchive

Alton Williams3-Nov-03 23:20

Re: Overloading the << and >> operators CArchive

3-Nov-03 23:20

Steve S wrote:
friend CArchive& operator<<( CArchive& ar, myObj obj);
friend CArchive& operator>>( CArchive& ar, myObj& obj);
return ar;

I've those that inside a generic underived class but the compiler complains i.e. what the hell am I talking about.
do I:

place the functions in the appropiate C++ and header files
subclass them from CObject (which I don't want to do)
or find the correct syntax (which is)

Alton

There's no problem, only solutions
John Lennon

Steve S4-Nov-03 0:58

Steve S

4-Nov-03 0:58

Your C++ class must be derived from CObject to be serialisable anyway (see DECLARE_SERIAL, IMPLEMENT_SERIAL).
You would put those definitions in your 'base' class's header file, with the implementation, which is normally to call obj.Serialize(CArchive&ar), which you then implement.

You can then use these objects in your document's serialize method, using the operators, or alternatively, call the object's serialize method directly.

Does that help any?

Steve S

CDataGrid

Alton Williams3-Nov-03 4:22

Opening Bookmarked HTML files

3-Nov-03 4:22

Does any one know how rows & columns can be added or remove on MSDataGrid control programatically. without using the CRecordset class. Wink | ;)

(there must be a way)

Many thanks
Alton

How to use UniCode

Member 4580153-Nov-03 3:19

Member 458015

3-Nov-03 3:19

How to use UniCode in VC++ (CEdit control) or win32.

Re: How to use UniCode

Joe Woodbury3-Nov-03 5:45

Joe Woodbury

3-Nov-03 5:45

I don't understand the question. But for a project to support Unicode without any other changes, you need to turn that feature on. You'll then need to make sure all your chars are TCHARs and your strings have the _T() macro around them. (If you are using pure Unicode, you can use wchar_t and the L prefix for strings.)

If you just want to make a single Win32 call using the Unicode function, use a Unicode string, if needed, and tack a 'W' on the end.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

John Ulvr3-Nov-03 3:11

John Ulvr

3-Nov-03 3:11

I am trying to open an htlm file to a specific bookmark without any success. I am tyring to use the ShellExecute command as follows:

ShellExecute(0, "open", "c:\test.html#Bookmark1", NULL, NULL, SW_SHOWNORMAL);

The result is that the program opens test.html in explorer, but does not got to Bookmark1. Is there any way to do this?

And while I'm on the subject, is there any way to do the same thing with PDF files (open a PDF file to a specific location?)

Thanks,

John

Running CScript.exe via CreateProcess

Gary Wheeler3-Nov-03 2:16

3-Nov-03 2:16

I'm automating our product build process. I have a native Win32 application that does some UI setup and updates version resources, and then it runs the build script. The build script is a .wsf (Windows Script File) that I want to run using CScript, the console script host.

My problem is this: If I call CreateProcess with CScript.Exe as the file to execute, the process starts, creates a console window, and exits immediately:

STARTUPINFO startup_info = { 0 };
char        startup_title[128];
	
strcpy(startup_title,"Distribution build");
	
startup_info.cb      = sizeof(startup_info);
startup_info.lpTitle = startup_title;

PROCESS_INFORMATION process_info = { 0 };

CreateProcess("CSCRIPT.EXE",
              "//nologo DistributionBuild.wsf",
              NULL,NULL,FALSE,
              "C:\SC400.Build",
              &startup_info,
              &process_info);

However, if I start CScript.Exe via the command interpreter, it runs correctly:

CreateProcess("CMD.EXE",
              "CScript //nologo DistributionBuild.wsf",
              NULL,NULL,FALSE,
              "C:\SC400.Build",
              &startup_info,
              &process_info);

Anyone have any ideas why this might be the case?

Software Zen: delete this;

David Crow3-Nov-03 4:32

David Crow

3-Nov-03 4:32

You seem to be missing two parameters to CreateProcess(). I'm guessing that DWORD dwCreationFlags and LPVOID lpEnvironment are the ones.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Gary Wheeler3-Nov-03 5:08

3-Nov-03 5:08

Thanks for your help, and sorry for the missing stuff. I'm using dwCreationFlags = 0 and lpEnvironment = NULL. I just reread the help for CreateProcess and realized I probably should use dwCreationFlags = CREATE_NEW_CONSOLE. Leaving the environment set to NULL should cause the new process to receive a copy of the existing one.

Software Zen: delete this;

David Crow3-Nov-03 5:20

David Crow

3-Nov-03 5:20

What about the double backslash in the lpCurrentDirectory parameter? Does GetLastError() return a non-zero value in your first example of CreateProcess()?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Gary Wheeler3-Nov-03 7:10

3-Nov-03 7:10

The current directory included the proper backslashes (the code I posted originally is paraphrased). The process does start (CreateProcess doesn't return an error), but it doesn't run the script.

Mike Dunn gave me the key (see the posts below). Thanks for your help Rose | [Rose]

Software Zen: delete this;

Michael Dunn3-Nov-03 5:39

Michael Dunn

3-Nov-03 5:39

The first param to CreateProcess() should be NULL, and the second the complete command line.

--Mike--
Ericahist [updated Oct 26] | CP SearchBar v2.0.2 | Homepage | RightClick-Encrypt | 1ClickPicGrabber
If my rhyme was a drug, I'd sell it by the gram.

Gary Wheeler3-Nov-03 7:07

Winsock : Ip of broadcaster

3-Nov-03 7:07

That makes it work Rose | [Rose]

.

Hmmm. Looking at my original code, when I was specifying "C:\Windows\System32\CScript.Exe" as the application parameter, and "//nologo DistributionBuild.wsf" as the command line, I realize I wasn't repeating the program name in the command line, e.g. "C:\Windows\System32\CScript.Exe //nologo DistributionBuild.wsf". Perhaps that was what was causing the problem. Thanks for your help.

Software Zen: delete this;

Ortie3-Nov-03 1:25

Ortie

3-Nov-03 1:25

Hi, I need help.

I have enabled asynchronous listening on tcp and udp port.

When I receive TCP request, averything is ok, i read source IP adress
(FD_ACCEPT) and data (FD_READ).

But when UDP broadcast message comes, i cannot read IP adress, because
there is no FD_ACCEPT event. I can only read udp data.
How can i get source ip of UDP datagram?

Thanx for help.

Re: Winsock : Ip of broadcaster

Ortie3-Nov-03 1:37

Ortie

3-Nov-03 1:37

I've already made it,
simply call recvfrom() instead of recv().

Thanks anyway.

O.

debug error

ranjjj3-Nov-03 0:25

ranjjj

3-Nov-03 0:25

ERROR IN THIS PART OF A MFC APPLICATION!
IT SAYS..
DAMAGE:AFTER NORMAL BLOCK #90 AT 0*30101110

This prog is basically to get a particular record from a databaseprinted in the edit box.
void CProd_listDlg::OnOK()
{ UpdateData(TRUE);
// TODO: Add extra validation here
ADODB::_ConnectionPtr m_pConnection = NULL;
ADODB::_RecordsetPtr pRecordset = NULL;
VARIANT *vRecordsAffected = NULL;
char ConStr[500];
char ConStr1[100];
_bstr_t prodname;
_bstr_t id;
BOOL m_bIsConnectionOpen;
char strSelect[500];

// Create an instance of _Connection

HRESULT hr ;
hr = m_pConnection.CreateInstance(__uuidof(ADODB::Connection));

if (SUCCEEDED(hr))
{
//Open a connection where database is access database : "c:\\emailparsing\\prod_list.mdb"

ConStr[0] = '\0';
strcat(ConStr, "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=");
strcat(ConStr, "c:\\Aegis_proj\\prod_list.mdb" );
m_pConnection->Open(ConStr, "", "", 0);

//If database opened successfully then set IsConnectionOpen to TRUE

if (SUCCEEDED(hr))
{
m_bIsConnectionOpen = TRUE;
}

}

try
{
::MessageBox(NULL, m_edit1, "", MB_OK);
_bstr_t ConStr(m_edit1);
::MessageBox(NULL,ConStr,"",MB_OK);
// strProductName = m_edit1;
sprintf(strSelect,"SELECT * FROM prodlist WHERE product_name = '%s' ", (char *)ConStr);
::MessageBox(NULL,strSelect,"",MB_OK);
_bstr_t ConStr1(strSelect);
::MessageBox(NULL,ConStr1,"",MB_OK);
pRecordset = m_pConnection->Execute(ConStr1, vRecordsAffected, 1);
::MessageBox(NULL, "returning", "", MB_OK);

if (!pRecordset->GetEOFile())
{
int i = 0;

id = ((_bstr_t) pRecordset->GetFields()->GetItem("id")->GetValue());
prodname = ((_bstr_t) pRecordset->GetFields()->GetItem("product_name")->GetValue());
strcat(id,prodname);
::MessageBox(NULL, id, "", MB_OK);
m_edit2 = LPCTSTR(id);
::MessageBox(NULL, m_edit2, "", MB_OK);

UpdateData(FALSE);

i++;

}

pRecordset->Close();
}
catch (_com_error &e)
{
::MessageBox(NULL, (LPCTSTR)e.Description(), "Error!", MB_OK);
//printf("Description = '%s'\n", (char*) e.Description());
}

CDialog::OnOK();
return ;
}

void CProd_listDlg::OnCancel()
{
// TODO: Add extra cleanup here

CDialog::OnCancel();
}

void CProd_listDlg::OnChangeEdit1()
{
// TODO: If this is a RICHEDIT control, the control will not
// send this notification unless you override the CDialog::OnInitDialog()
// function and call CRichEditCtrl().SetEventMask()
// with the ENM_CHANGE flag ORed into the mask.

// TODO: Add your control notification handler code here

ranjani

Michael P Butler3-Nov-03 0:56

Michael P Butler

3-Nov-03 0:56

Just a couple of things at first glance,

char ConStr[500];
_bstr_t ConStr(m_edit1);

Using the same name for two different variables is confusing.

Also, shouldn't you have a MoveFirst() before you attempt to get values from your recordset.

I'm not sure but shouldn't

VARIANT *vRecordsAffected = NULL;

be

VARIANT vRecordsAffected;

Michael

'Logic, my dear Zoe, merely enables one to be wrong with authority.' - The Doctor: The Wheel in Space

ranjjj3-Nov-03 4:02

ranjjj

3-Nov-03 4:02

it didn't workk
i get debug error!
on debugging
i noticed that
the program control doesn't go after the return statement int the end!

ranjani

David Crow3-Nov-03 4:36

David Crow

3-Nov-03 4:36

To get any useful replies, you might consider narrowing it down quite a bit (i.e., looking at a whole wad of irrelevant code will scare off even the most seasoned troubleshooter). What sort of error is it? Is an assertion firing? Have you single-stepped through the code with the debugger? Provide some hints as to what is happening versus what is supposed to happen.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?