C / C++ / MFC

Igor Sukhov3-May-01 2:46

3-May-01 2:46

Hi !

Take a look at hooks.

Best regards,

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

3-May-01 4:30

Could you have more details in relation to your answer or sample code, please??

Thanks in advance,

LuisFer.

Igor Sukhov3-May-01 4:40

3-May-01 4:40

Using SetWindowsHookEx you should set global hook. Hook procedure should be placed in DLL.

Best regards,

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

Igor Sukhov3-May-01 4:40

3-May-01 4:40

Using SetWindowsHookEx you should set global hook. Hook procedure should be placed in DLL.
Use WH_CALLWNDPROC hook type to intercept messages.

Best regards,

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

3-May-01 5:36

Thank you for your previous answer, but I need more information or sample code about "Hooks" taking into account my knowledge of Visual C++. I've seen the SetWindowsHookEx function but I don't understand how to use it.

Thanks in advance and best wishes,

LuisFer.

Christian Graus3-May-01 13:28

Christian Graus

3-May-01 13:28

I took a look, I saw a nook, and on his head he had a hook. On his hook, he had a book, and on his book said how to cook. But a nook, can't read, so a nook can't cook, so what use to a nook is a hook cook book ?

Sorry, it's early Friday....

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

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

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

hearties3-May-01 0:04

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

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:

Igor Sukhov3-May-01 1:08

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

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

hearties3-May-01 1:17

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

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:

hearties3-May-01 1:22

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

3-May-01 1:22

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

delete[] fileBuf;

it says identifier undeclared.

hearties3-May-01 1:26

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

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]

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

Re: CStdioFile::ReadString can't work

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

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

Re: CStdioFile::ReadString can't work

2-May-01 22:42

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

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

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

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

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