Re: Thread question - C / C++ / MFC Discussion Boards

Neville Franks14-Oct-02 20:31

14-Oct-02 20:31

Last time I looked only a very small part of Loki had been implemented for VC6 and I was told that their wasn't much more they could do because of the VC6 compiler limitations we all know about.

I bought "Modern C++ Design" a few months back and got quite excited reading it, only to be let down by the inability to actually use it.

It sure would be great if someone would write a nice big reference + examples book for Boost. Cool | :cool:

I'll follow your suggestion and focus on Boost, and I guess STLPort.

Neville Franks, Author of ED for Windows. www.getsoft.com

Thread question

Anonymous14-Oct-02 7:22

Anonymous

14-Oct-02 7:22

Forgive me if this is a dumb question I am very new to thread programming.. I have read a bunch of the articles here on code project about threads.. I want to do the following in a thread but the problem is that I need to pass the thread or start the thread with 3 vars "CString strPath, CString strDns, int nPort"... heres the snip of code that I am using to send a file.

I have tried to create a thread to do the following but it crashes every time..

Anyone have any ideas how I can do the following inside a thread??

CFile myFile(strPath, CFile::modeRead | CFile::typeBinary);
					
	CSocket sSocket;
	sSocket.Create();
	int iConnect = sSocket.Connect(strDns,nPort);
	if(iConnect == SOCKET_ERROR)
	{
		AfxMessageBox("Communication Error!");
	}
	else
	{
		CSocketFile sf(&sSocket);
		CArchive ar(&sf, CArchive::store);
							
		//get file info 
		DWORD length = myFile.GetLength();
		char *data = new char[length];
		myFile.Read(data, length);

		//send it across
		ar << myFile.GetFileName();
		ar << length;
		ar.Write(data,length);
							
		myFile.Close();
							
		delete[] data;
	}

Thanks!

Re: Thread question

valikac14-Oct-02 7:44

valikac

14-Oct-02 7:44

I do not see where you create a worker thread. Where does the thread begin?

Use a worker thread.

Kuphryn

Re: Thread question

Anonymous14-Oct-02 7:59

Anonymous

14-Oct-02 7:59

I have tried a few different ways to create the thread but all result in the same type of errors.. here is one example that i used, but i cant pass the thread any variables.. I can just start it and stop it..

Header..

static UINT run(LPVOID p);
void run();
volatile BOOL running;

void CMyView::TransferFile()
    {
     running = TRUE;
     AfxBeginThread(run, this);
    }
 
UINT CMyView::run(LPVOID p)
    {
     CMyView * me = (CMyView *)p;
     me->run();
     return 0;
    }
 
void CMyView::run()
   {
     // do the transfer
    running = FALSE;
   }

Re: Thread question

valikac14-Oct-02 8:16

valikac

14-Oct-02 8:16

Consider a global thread function. Otherwise, make run() a static function.

Kuphryn

Re: Thread question

Anonymous14-Oct-02 8:54

Anonymous

14-Oct-02 8:54

If I make run() static.. how can I access member functions from CMainFrame? Or is that a "no-no"?

Re: Thread question

valikac14-Oct-02 11:59

valikac

14-Oct-02 11:59

You may access the static member function via :: operator.

Kuphryn

Re: Thread question

Neville Franks14-Oct-02 12:23

Neville Franks

14-Oct-02 12:23

This looks ok to me and is the sort of thing I do in ED. I wouldn't have called both functions run though, but that is besides the point. Also don't use the old C style casts in C++. I assume the view exists for the duration of the thread function. Where precisely does it crash?

Neville Franks, Author of ED for Windows. www.getsoft.com

Re: Thread question

RobJones14-Oct-02 18:26

RobJones

14-Oct-02 18:26

it crashes on the Create() of the CSocket object.. I just implemented a CWinThread class and I am trying to do the same thing with in that class because someone stated that I need a UI thread instead of a worker thread.. I guess CSocket needs a Message Pump.. but now I am still having the same problems it still crashes on the Create function.. I posted another question in the forum because I changed the code so much.. I have a feeling that the CSocket needs to be attached to the thread but I am having no luck.. Any ideas?

Re: Thread question

Neville Franks14-Oct-02 19:08

Neville Franks

14-Oct-02 19:08

I'm afraid I can't help much with CSocket as I've never used it. That said if you look in the debugger at the error it should give you a very good idea of what the problem is. Looking at the MFC code my guess is something in CAsyncSocket::AttachHandle() is ASSERTing.

I'd be surprised if there wasn't code which used CSocket in a thread here on CP. Maybe spend some time looking at the articles in the relevant section.

Neville Franks, Author of ED for Windows. www.getsoft.com

Re: Thread question

RobJones15-Oct-02 3:34

RobJones

15-Oct-02 3:34

Thanks for all the suggestions.. I am going to trace the error codes for CSOcket and see what type of error i am getting from the create function.. I tried to create the socket in my main thread and pass the handle to the thread but the socket in the thread gives me a invalid socket.. anyway, I'll do some more testing, its probably just something dumb on my part..

Thanks!
Rob

Why?? This code block return the "ERROR_INVALID_OWNER"?? Please Help me~~

Qiang.Fu14-Oct-02 6:47

Qiang.Fu

14-Oct-02 6:47

// setowner.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream.h>
#include <windows.h>
#include <tchar.h>

#define ErrorHandler(s) _ErrorHandler(s, __FILE__, __LINE__)

void _ErrorHandler(LPCSTR lpszLocation, LPCTSTR lpszSrcFile, UINT nSrcLine)
{
LPVOID lpMsgBuf;
DWORD dwError = GetLastError();

FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwError,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
(LPSTR) &lpMsgBuf,
0,
NULL );

// Process any inserts in lpMsgBuf.
cout<<"ERROR @ "<

How to create .exe from my .exe

Johnny_Papa14-Oct-02 6:40

Johnny_Papa

14-Oct-02 6:40

ive seen a lot of application create .exe from the main application, and not just one, i mean after a serie of choices u can do that.

To make myself clear, im not talking about adding a single exe to the ressource and reading it than writing it in a .exe file.
I meant after a series of tests or choices i want to be able to generate a custom .exe

Hope this is clear enough, and thanks in advance for any tip or help!

Johnny

Re: How to create .exe from my .exe

Pavel Klocek14-Oct-02 7:41

Pavel Klocek

14-Oct-02 7:41

See this[^] for informations about PE file format (Win32 exe).

Pavel
Sonork 100.15206

Re: How to create .exe from my .exe

jmkhael14-Oct-02 7:59

jmkhael

14-Oct-02 7:59

Thanks a lot, ill read through it!

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Getting Drive info. from OS path

Xeena14-Oct-02 6:38

Xeena

14-Oct-02 6:38

Hello,

I am using a function called IDiscMaster::GetPath(). This function is returning the OS path like for CDRom its \Device\CDRom0. How can I find out that this path is mapping to which drive. Like I want to findout whether this \Device\CdRom0, is mapping to drive A:\,B Hmmm | :|

... so on.
Please, help if someone has any idea.

Thanks,

Re: Getting Drive info. from OS path

Mike Nordell14-Oct-02 8:08

Mike Nordell

14-Oct-02 8:08

QueryDosDevice. Though, I think you can only use a drive letter to get an NT object name, meaning you'll have to loop all drive-letters until you find a match. Frown | :-(

Image

Anonymous14-Oct-02 6:32

Anonymous

14-Oct-02 6:32

I want to receive some bitmap from client with socket. How i can start?

Re: Image

jmkhael14-Oct-02 6:42

jmkhael

14-Oct-02 6:42

Start developping the Client server first, then u can just read the bitmpap file and send it to the server and its the job of the server to rewrite the bitmap file !

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Image

Rickard Andersson²⁰14-Oct-02 6:43

Rickard Andersson²⁰

14-Oct-02 6:43

This is answered in this forum before, you can try search the forum!
But, to send a bitmap you just read the bitmap file in binary mode and then simply send(bitmap_data,...)! Smile | :)

or something! Smile | :)

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Updating Resource in Windows NT

Atlence14-Oct-02 6:19

Atlence

14-Oct-02 6:19

Hi!

I'm using the Win NT UpdateResource API to change the main icon of a program. My code works well if I extract an icon from a module (EXE/DLL) and I replace the destination icon by this one.

Here my code:

<br />
HANDLE	hUpdate;<br />
char*	lpResLock;<br />
HINSTANCE hExe;<br />
HRSRC hRess;<br />
<br />
hExe=LoadLibrary ("c:\\winnt\\explorer.exe");<br />
hRess=FindResource (hExe, MAKEINTRESOURCE (10), RT_ICON);<br />
lpResLock=(char*) LockResource (LoadResource (hExe, hRess));<br />
<br />
hUpdate=BeginUpdateResource ("c:\\winnt\\calc.exe", FALSE);<br />
UpdateResource (hUpdate, RT_ICON, MAKEINTRESOURCE (1), 1036, lpResLock,SizeofResource(hExe, hRess));<br />
EndUpdateResource (hUpdate, FALSE);<br />
FreeLibrary (hExe);<br />

I would now like to do the same thing but instead of extracting an icon from an module, I would like to get the icon from an ICO file.

How can I use UpdateResource API with an ICO file? Confused | :confused:

Thks in advance!
Appstmd
http://www.appstmd.com

Re: Updating Resource in Windows NT

Pavel Klocek14-Oct-02 7:48

Pavel Klocek

14-Oct-02 7:48

LoadImage[^] API function should help.

Pavel
Sonork 100.15206

Re: Updating Resource in Windows NT

Daniel Turini14-Oct-02 7:57

Daniel Turini

14-Oct-02 7:57

Something like this:

hIcon = LoadImage(NULL, "file.ico", IMAGE_ICON, 0, 0, LR_LOADFROMFILE);

My latest articles:
Desktop Bob - Instant CP notifications
XOR tricks for RAID data protection

Tempfile access from other process

Stephan Pilz14-Oct-02 4:34

Stephan Pilz

14-Oct-02 4:34

Hi,

If I create a tempfile with _open (_sopen) and _O_TEMPORARY-flag I can write to this file but I hav'nt access from an other application. Here the complete Code:

int fh = _sopen ("tempfile.ext", _O_BINARY | _O_RDWR | _O_CREAT | _O_TEMPORARY, _SH_DENYNO, _S_IREAD | _S_IWRITE);
int written = _write (fh, (void *) buffer, sizeof (buffer));
StartApplication ("tempfile.exe");
_close (fh);

Is anybody out there with an solution? I hoped, if I close my 2nd Application (he should open the tempfile for read), the system delete my tempfile automaticly.

Stephan

find of STL

IMiracle14-Oct-02 4:13

IMiracle

14-Oct-02 4:13

I have a code statements:

vect<cstring> strs("ddd");

find(strs.begin(), strs.end(), strs);

Building message:
error C2440: '=' : cannot convert from 'const class CString *' to 'class CString *'

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.