CStdioFile::ReadString can't work - C / C++ / MFC Discussion Boards

Re: capturing window messages with Visual C++ 6.0

3-May-01 5:34

If you don't want to program, you can use the Spy++ tool with ships with VC++.
You can use it to detect all messages received by the window you can inspect.

Regards

Luis

can't get the right type of buffer to read file.

hearties3-May-01 0:04

hearties

3-May-01 0:04

can't get this code working.

DWORD fileLength = workFile.GetLength(); //line 1
char fileBuf[fileLength]; //line 2
workFile.Read(fileBuf, fileLength); //line 3

compiler says (all for line 2):
error C2057: expected constant expression
error C2466: cannot allocate an array of constant size 0
error C2133: 'fileBuf' : unknown size

Confused | :confused:

Re: can't get the right type of buffer to read file.

Igor Sukhov3-May-01 1:08

Igor Sukhov

3-May-01 1:08

Hi !

Try this:

DWORD fileLength = workFile.GetLength(); //line 1
//char fileBuf[fileLength]; //line 2
char * fileBuf = new char[fileLength];

workFile.Read(fileBuf, fileLength); //line 3
....
delete[] fileBuf;

Best regards,

-----------
Igor Soukhov (Brainbench/Tekmetrics ID:50759)
igor_soukhov@mailru.com | ICQ:57404554 | http://siv.da.ru

Re: can't get the right type of buffer to read file.

hearties3-May-01 1:17

hearties

3-May-01 1:17

thanz.. that solved part of the problem.. now the compiler says that fileBuf is undeclared (line 2)

*confused* Confused | :confused:

Re: can't get the right type of buffer to read file.

hearties3-May-01 1:22

hearties

3-May-01 1:22

correction to my previous post ... the error lies in the line:

delete[] fileBuf;

it says identifier undeclared.

Re: can't get the right type of buffer to read file.

hearties3-May-01 1:26

hearties

3-May-01 1:26

please ignore all my previous post.. the problem is fixed.. overlooked some areas..
thanz a lot for your help!

Rose | [Rose]

I am broadcasting a message on port 53 with INADDR_BROADCAST to locate a nearest NameServer. Why no response ?

2-May-01 21:59

If I make the broadcast to a real nameserver it is ok. If I give INADDR_BROADCAST , no one response. Kindly help to me.
Thankyou

Anita Eugene

CStdioFile::ReadString can't work

hearties2-May-01 21:11

hearties

2-May-01 21:11

my code is below, there is no compiler error, but when i run the exe file, it says "An unknown errro occurred while accessing C:\myfile.txt"

can anybody help me?

CStdioFile workFile;
CFileException e;
CString filepath = m_tsfFilepath;

if(!workFile.Open(filepath, CFile::modeWrite | CFile::shareDenyWrite, &e ))
{
#ifdef _DEBUG
afxDump << "File could not be opened " << e.m_cause << "\n";
#endif
}

int pos = 0;
CString workString("");
CStringArray aRegisterList;

workFile.Seek(pos, CFile::begin); //position pointer to beginning of file
workFile.ReadString(workString); //read the first line of text

thanz in advance!
Blush | :O

Re: CStdioFile::ReadString can't work

David Fleming2-May-01 22:34

David Fleming

2-May-01 22:34

The thing that jumps out at me is that you are opening the file with flags set for WRITE not READ.

I'll confess I did not thoroughly step through your code simply because I noticed that right away.
I hope that's it because that's easy.

Re: CStdioFile::ReadString can't work

hearties2-May-01 22:42

hearties

2-May-01 22:42

thanz man! how stupid of me! Dead | X|

Re: CStdioFile::ReadString can't work

David Fleming2-May-01 23:47

David Fleming

2-May-01 23:47

I find that the majority of the problems I have are for just such "simple" oversights.

I'm glad it helped.

Sending a Windows Message to signal socket activity

2-May-01 20:16

In my message map...

BEGIN_MESSAGE_MAP()
...
ON_WM_????
END_MESSAGE_MAP

what is the message used to tell a window to assert the OnRecieve method of a CAsyncSocket object. Confused | :confused:

Check boxes in CTreeCtrl

Steve Driessens2-May-01 20:02

Steve Driessens

2-May-01 20:02

G'day,

I'm using a CTreeCtrl with check boxes on each item in a dialog. During to call to the dialog's OnInitDialog() I set up the initial checked/unchecked status for each tree item, but these checks seem to disapear when the dialog is actually displayed.

I've poked around in my code and it seems that the checked status is actually lost for each tree item some time after OnInitDialog() returns.

I can check/uncheck tree items with the mouse after the dialog is displayed, but it just seems to lose the checks when initializing.

Can anybody point me in the right direction, please?

I'm sure this has been discussed here at CP before, but I can't find any references.

TIA,
Steve

Re: Check boxes in CTreeCtrl

Tomasz Sowinski2-May-01 23:15

Tomasz Sowinski

2-May-01 23:15

Some code please - OnInitDialog handler would be best.

Smile | :)

Tomasz Sowinski
http://www.shooltz.com.pl

Re: Check boxes in CTreeCtrl

Steve Driessens3-May-01 14:36

Steve Driessens

3-May-01 14:36

G'day Tomasz,

I won't post my actual code here (it's way too long), but the following snippet has the same effect. Note, I've set up the tree control in the dialog as having check boxes enabled.

////////////////////////////////////////////////////////////////
// OnInitDialog

BOOL CReportSettingsDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();

	CString strItemName;

        // Insert some dummy items into the tree...
	for(int i = 0; i < 20; i++){

		strItemName.Format(_T("Item%d"), i);
		HTREEITEM hItem = m_Tree.InsertItem(strItemName);
		ASSERT(NULL != hItem);

                // Set the check for the new item.
		m_Tree.SetCheck(hItem, TRUE);
	}

	return TRUE;
}

When the dialog above gets drawn, the tree displays the inserted items, but none of their check boxes are checked.

TIA,
Steve

Re: Check boxes in CTreeCtrl

Tomasz Sowinski3-May-01 23:42

Tomasz Sowinski

3-May-01 23:42

The solution is quite funny. Here's what I found in the "Tree View Control Window Styles" at MSDN:

"TVS_CHECKBOXES:
...
If you want to use this style, you must set the TVS_CHECKBOXES style with SetWindowLong after you create the treeview control, and before you populate the tree. Otherwise, the checkboxes might appear unchecked, depending on timing issues."

To solve the problem, you have to:
(1) clear the 'check boxes' option in the tree control properties in dialog editor
(2) programatically set the style after the window is created and before items are inserted:

m_Tree.ModifyStyle(0, TVS_CHECKBOXES);
for (...)
{
m_Tree.InsertItem(...);
m_Tree.SetCheck(...);
}

(2) is not enough (at least on my W2K box) - you can't have your tree control created with TVS_CHECKBOXES style.

Cheers,

Tomasz Sowinski
http://www.shooltz.com.pl

Re: Check boxes in CTreeCtrl

Steve Driessens4-May-01 0:21

Steve Driessens

4-May-01 0:21

G'day Tomasz,

Thanks for that. It worked a treat!

Steve

Do I HAVE to install MDAC for Office 2000?

Matt Philmon2-May-01 12:02

Matt Philmon

2-May-01 12:02

I have to continue to support an old MFC-based application that still uses ODBC to connect to an Access 97 database. (We're rewriting the whole thing as a web application but until it's done we have to continue to add features and support...) Anyway, the database is updated each time we release a new patch to the system (upgrade). The upgrades come down from the web, so we TRY to be kind on the size of the patch. Continuing to update an Access 97 is a major pain since pretty much everyone has moved on to 2000. However, if I convert the database to Office 2000, the database won't load through ODBC calls without installing at least MDAC 2.5. The patch is a single patch that supports Windows 95/98/ME/NT/2000 so (using InstallShield) the MDAC 2.5 object bloats the 4.5 MB patch to 13.5 MB (I suppose because of the cross-platform support).

Is there any minimal things I can do make this work without having to install the entire MDAC update?

Problem With Auto Complet.

Ghasrfakhri2-May-01 9:32

Ghasrfakhri

2-May-01 9:32

My VC environment donnot show STRUCTs & Ojects member.
what can I do to Fix it.

Iman Ghasr-e-fakhri
Rose | [Rose]

Re: Problem With Auto Complet.

Michael Dunn2-May-01 9:53

Michael Dunn

2-May-01 9:53

Most IntelliSense problems can be fixed by closing the workspace and deleting the .NCB file. The NCB will be recreated when you open the workspace again.

--Mike--
http://home.inreach.com/mdunn/
The Signature, back by popular demand: Buffy. Pajamas.

Getting hwnd of a child window

Rukhsar2-May-01 8:03

Rukhsar

2-May-01 8:03

Does anyone know how to get a handle to a mdi child window WITHOUT MAKING IT ACTIVE?
Take a look at this code:

CMDIFrameWnd *pFrame = (CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;
CMDIChildWnd *pChild;
CMyView *pView;
CMyDoc *doc;
CString findWindow = "My1";// this is the title of the window i want to find
while(TRUE){
pChild = (CMDIChildWnd *)pFrame->GetActiveFrame();
pView = CMyView *) pChild->GetActiveView();
doc = (CMyDoc *) pView->GetDocument();

CString str;
str = doc->GetTitle();

//if screen title is the same as node text, return.
if(findWindow.Compare(str) == 0)
return TRUE;

pFrame->MDINext();
}

This code works great, it will find the child window that has the same title as the one i pass to it.
however, it will make all the open windows active when, method MDINext() will go to next child
and will activate that child, i don't want that, i want it to search through all window without
activating them.
I used LockWindowUpdate on pFrame after calling MDINext() but it did not work,
any idea?
Thanks,

****Rukhsar

Re: Getting hwnd of a child window

Stephen Caldwell2-May-01 14:36

Stephen Caldwell

2-May-01 14:36

You try using the win32 API function EnumChildWindows().

Stephen Caldwell
Desick Information Technologies

Keeping process out of task manager

Daníel B. Sigurgeirsson2-May-01 6:45

Daníel B. Sigurgeirsson

2-May-01 6:45

What's up! I am trying to make a program that I am developing bullet

proof. What I need to do is prevent a user to use the "control-alt-delete" button

to kill a program. He needs to gracely terminate the program by using the programs

own termination buttons. Does anybody know how to accomplish this? The program

shows up in the taskmanager window. If this is not possible is there a hack to keep

a program out of the taskmanager and at the same time keep it running? This program

runs under win9x,ME and 2000. Is there also a possibility if they do get to the

program that is running and when they kill it ungracefully that I can make their

machine hang?
Thanks in advance,
Raymond

Raymond Bentoera
Cybergate Interactive

Re: Keeping process out of task manager

Tomasz Sowinski2-May-01 23:19

Tomasz Sowinski

2-May-01 23:19

Well, as a user, I definitely don't like programs that can't be killed. And making somebody's machine hang after killing the process seems to be the activity of worm/virus.

Tomasz Sowinski
http://www.shooltz.com.pl

Re: Keeping process out of task manager

yamini3-May-01 0:30

yamini

3-May-01 0:30

Hi,
My problem is similar to the one replied .It is related to process hiding in the TaskManager .I have a parent process running .The child process of this parent should not be able to see it's parent process in the TaskManager !But the aprent process will be runing . I want to show the parent when the child process is killed .How can I do it ?

Thanx in advance for the help !

Y.Yamini Devi

Last Visit: 31-Dec-99 18:00 Last Update: 8-Jun-24 19:31

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