Re: CSocket and threads - C / C++ / MFC Discussion Boards

Re: DrawText - BUG? - When using Italic font, returns incorrect width using DT_CALCRECT

noirs23-Apr-03 8:35

3-Apr-03 8:35

Thanks for the response Davide.. so I take it you've had the same problem? I came up with a similar solution:

GetTextMetrics i_lHDC, metrics
If metrics.tmItalic <> 0 Then
lActualWidth = lActualWidth + metrics.tmAveCharWidth
End If

Basically I increase the width of the rect by the average character width if it is italic.

declaring 2D arrays

Anonymous3-Apr-03 7:13

Anonymous

3-Apr-03 7:13

Hi,

I want to be able to do something like this ...

<br />
MyView::MyView( int w, int h) <br />
{<br />
...<br />
    pDoc->m_buffer = malloc ( w * h );<br />
    for ( int i=0; i<w; i++ ) {<br />
            for ( int j=0; j<h; j++ ) {<br />
                 p_Doc->m_buffer[i][j] = PI * some_random();<br />
            }<br />
    }<br />
...<br />
}<br />

... my question is how should I declare m_buffer in my MyDoc class?
I thought I would do this ...

<br />
class MyDoc : public CDocument<br />
{<br />
...<br />
public:<br />
    double m_buffer[][];<br />
...<br />
}<br />

but that don't compile. Please help!

Re: declaring 2D arrays

Maximilien3-Apr-03 7:16

Maximilien

3-Apr-03 7:16

Anonymous wrote:
double m_buffer[][];

replace by double** m_buffer ?

Maximilien Lincourt
For success one must aquire one's self

Comand line error D2016

ElizabethC3-Apr-03 7:13

ElizabethC

3-Apr-03 7:13

After I have converted a project from VC++ 6 to VC++7 (Visual Studio .NET). I tried to rebuild the project. I received this error message:

Command line error D2016 : '/O2' and '/RTC1' command-line
options are incompatible

Is this common? I looked up D2016 from Help menu and found this:

Visual C++ Concepts: Building a C/C++ Program

Command-Line Error D2016
'option1' and 'option2' Command-line options are incompatible

The command-line options cannot be specified together.

Example

cl /Gw /NDxx program.c
In this example, the /Gw and /NDxx options are incompatible
because each has a different special-entry sequence.

Check the CL or FL environment variable for option
specifications

I don't have command line with syntax cl /.... in my source code. Please help.

-Elizabeth

Eilzabeth

Re: Comand line error D2016

AlexO3-Apr-03 8:03

AlexO

3-Apr-03 8:03

menu Project->Properties
Configuration Properties->C/C++->Command Line

remove /RTC1

CSocket and threads

Beer3-Apr-03 6:56

Beer

3-Apr-03 6:56

hey all,

say you have CSocket, or a plain WSA socket as a pointer member of a class, and you block the socket on a read method, and while it's blocked, you pass a reference to the class containing the socket to another thread through a casted pointer through the LPVOID pParam of a thread message,

THEN, you start doing other operations on the CSocket from thread 2 through the pointer, while thread 1 has the thread on the blocked receive method.

Like say thread 1 has the socket blocked receiving and thread 2 does a send on the same instance of the class with the m_pcsocket???

Does the world suddenly blow up if that happens?

I used to do this all the time with java, but I'd like to know if it will properly work before I try it with CSocket.

hey

Re: CSocket and threads

valikac3-Apr-03 8:16

valikac

3-Apr-03 8:16

No. I think given that a socket is blocked, you have to wait for the thread to free the socket. One solution is WSA non-blocking model. WSA modes will return immediately and allows any other threads to process the socket.

Kuphryn

Re: CSocket and threads

Beer3-Apr-03 9:15

Beer

3-Apr-03 9:15

"void CancelBlockingCall( );
Remarks
Call this member function to cancel a blocking call currently in progress."

This is nuts, how are you going to cancel a blocking call if the call is blocked?

They HAVE to mean from another thread right?

Then you can cancel the receive before you send text then restart it right after your data is sent right?

am i wrong or am i right?

hey

Re: CSocket and threads

markkuk3-Apr-03 9:49

markkuk

3-Apr-03 9:49

MFC CSockets can't be passed between threads. It should be possible with a plain WinSock socket.

Re: CSocket and threads

Beer3-Apr-03 13:05

Beer

3-Apr-03 13:05

It turned out I was actually looking for CSocket's OnReceive function, overriding that gave the class i was writing the desired effect.

hey

How to scroll down a CEdit control?

IGx893-Apr-03 6:54

IGx89

3-Apr-03 6:54

I have a CEdit control defined like so:

EDITTEXT        IDC_LOG,7,177,437,86,ES_MULTILINE | ES_AUTOVSCROLL | <br />
                ES_READONLY | WS_VSCROLL<br />

I add text to it like this:

bool CFLModManagerDlg::Log(CString text, bool NewLine)<br />
{<br />
	LogString += text;<br />
	if(NewLine)<br />
		LogString += "\r\n";<br />
	UpdateData(FALSE);<br />
	LogCtrl.SetSel(0,-1,FALSE);<br />
	//CEdit *Edit = (CEdit*)GetDlgItem(IDC_LOG);//->SendMessage(WM_COMMAND,EN_VSCROLL,((LPARAM)GetDlgItem(IDC_LOG)->m_hWnd));<br />
	//Edit->LineScroll(1);//Edit->GetLineCount());<br />
	//LogCtrl.LineScroll(-1);<br />
	//UpdateData(FALSE);<br />
	return false;<br />
}<br />

Now, no matter what I do to try to make it scroll to the bottom, it won't! What am I doing wrong?

Get Click from subcontroller

Mathias S.3-Apr-03 6:49

Mathias S.

3-Apr-03 6:49

I Got an own custom controller.

Lets call it.

class CMyCtrl , public CWnd
{
public:
// ...
//
private:
CButton m_Btn;
};

and this controller creates the CButton ( m_Btn ) inside CMyCtrl dynamically.

How can CMyCtrl know if m_Btn is clicked ??

I Can subclass CButton and overload OnLButtonUp() and to
GetParent()->SendMessage(…) but I don’t want to. There must be a way to get CMyCtrl to get the information that a child window has been click or ??

ActiveX on Dialog breaks DialogBoxParam on Callback?

Dan Thurman3-Apr-03 6:46

Dan Thurman

3-Apr-03 6:46

Does anyone know if it is a fact that ActiveX components such as a DataGrid on a Dialog breaks DialogBoxParam such that WM_INITDIALOG never gets called but instead immediately shuts-down (WM_DESTROY) the Dialog?

I am using code that does not use MFC. A friend says that COM (ActiveX) does NOT work in a non-MFC environment. Is there a workaround???

Thanks --

Networking woes...

Navin3-Apr-03 6:23

Navin

3-Apr-03 6:23

I am trying to do something simple. A user types in a share name of a resource (e.g., \\Mycomputer\MyShare), and I want to validate it to make sure the resource actually exists before going any further.

Apparently, nobody else does this, becuase the documentation for all the Microsoft networking APIs sucks, and there are very few examples on the Net (I couldn't find anything relevant). Here are some of the things I've tried to do so far:

resource.dwType = RESOURCETYPE_PRINT;
resource.lpRemoteName = uncShareName.GetBuffer(0);

size = 0;
error = ::WNetGetResourceInformation(&resource, NULL, &size, NULL);

I always get error code 487 - Invalid address. (Of course, MSDN does not list this as an error that WNetGetResourceInformation should return.)

So then, I tried seeing if I could set the NETRESOURCE's lpProvider and perhaps that would make things go smoother. But this simple code:

DWORD size = 1000;
char provider[1000];
DWORD error;

error = ::WNetGetProviderName(WNNC_NET_MSNET, provider, &size);

always returns an error 1222, network cannot be found (network not present or cannot be found). Apparently my network type is wrong, but there are no others that look anywhere near correct.

For printers, I can use EnumPrinters and get it to work - but only if the remote server is Windows NT, 2000, or XP. It gives me an error, RPC Server unavailable, if I try to look for shares on a 9X machine.

One final piece of the puzzle - I know it is not a networking issue, becuase I can see any object I want using Windows Explorer or "Run" from the Start menu.

Any help would be appreciated.

"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity." - Albert Einstein

Re: Networking woes...

Navin3-Apr-03 10:44

Navin

3-Apr-03 10:44

Ah, nevermind, I figured it out. The key is to use WNetEnumResources.

"When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity." - Albert Einstein

Displaying Forms From A Visual Studio Macro

nde_plume3-Apr-03 5:19

nde_plume

3-Apr-03 5:19

I am trying to find a way to display a form from a
Visual studio macro. I have opened the Macro IDE,
but cannot find a way to insert a form. Can anyone
tell me how to do this, or do I need to build an
add in for such a thing? (Coding the macro in VB)

Thanks,

NDP.

Re: Displaying Forms From A Visual Studio Macro

Alvaro Mendez3-Apr-03 6:11

Alvaro Mendez

3-Apr-03 6:11

As far as I know, it's not possible in VC6. An add-in is your only option.

Regards,
Alvaro

When birds fly in the right formation, they need only exert half the effort. Even in nature, teamwork results in collective laziness. -- despair.com

Re: Displaying Forms From A Visual Studio Macro

nde_plume3-Apr-03 6:29

nde_plume

3-Apr-03 6:29

I'm sorry, I should have been more specific. I am using
Visual Studio .Net

Print previewing Word document in Active Document Container

Martyn Pearson3-Apr-03 4:30

Martyn Pearson

3-Apr-03 4:30

The story so far...

Using MSVC 6.0, I've created an MDI MFC application, and selected "Container" compound document support. I also ticked the Active Document container checkbox.

I run the application, and insert an object from a file - an existing Word document - into my document. As expected, it shows the whole Word document in the application.

I then select Print Preview from the menu. The print preview window comes up, showing an empty document. The document content is now spewing out of my printer Roll eyes | :rolleyes:

So, does anyone know how to fix this so the content goes to the print preview DC, not the printer DC?

Thanks in advance

.NET FlatStyle equivilent in MFC

Ceri3-Apr-03 4:23

Ceri

3-Apr-03 4:23

Hi,

I am trying to get XP alpha icons working in a ListView. I have created a manifest file which link to comctrl 6 but the XP style icons come out crappy. I have noticed in .NET there is a FlatStyle property that you need to set to FlatStyle.System to get it to work correctly.

How can I make XP Icons show correctly in MFC?

Thanks
Ceri

DestroyWindow() and delete

ns3-Apr-03 4:11

3-Apr-03 4:11

I have a bunch of local MyCDlg windows that I made using: MyCDlg* pDlg = new MyCDlg that have their pointers in a stored in a vector. At some point I want to kill all these windows so I cycle through the vector and do

pVec[i]->DestroyWindow()

Right after the destroy is it okay to do "delete pVec[i];" ? Is that the way to do it?

Appreciate your help,
ns

Re: DestroyWindow() and delete

Ravi Bhavnani3-Apr-03 4:18

Ravi Bhavnani

3-Apr-03 4:18

Yes. I assume they're modeless dialogs.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: DestroyWindow() and delete

ns3-Apr-03 4:21

3-Apr-03 4:21

yes. Whats wrong with killing modals this way?

Appreciate your help,
ns

Re: DestroyWindow() and delete

Ravi Bhavnani3-Apr-03 4:27

Ravi Bhavnani

3-Apr-03 4:27

You wrote:
Whats wrong with killing modals this way?
That's like stopping a car by removing its key while driving. Smile | :)

The proper way to force a modal dialog to end itself is to post an IDOK (or IDCANCEL) WM_COMMAND to it. That will cause the proper cleanup actions to occur. You can then delete the saved pointer to your dialog class.

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: DestroyWindow() and delete

ns3-Apr-03 4:30

3-Apr-03 4:30

thanks.....

Appreciate your help,
ns

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