C / C++ / MFC

Re: Pointer to multi-dimensional array?

9-Jan-03 3:56

depends:

1. //unsigned char array[100][100];
unsigned char** array = new char [100][100];
...
delete []array; array = NULL;

2. //unsigned char array[100][100];
unsigned char** array = new char* [100];
for(int i = 0; i < 100;++i)
array[i] = new char[100];

...
for(int i = 0; i < 100;++i)
delete[] array[i];
delete []array; array = NULL;

Dominik Reichl9-Jan-03 4:21

Dominik Reichl

9-Jan-03 4:21

Works

Thank you very much!!!
-Dominik

amutithreads server

smallcoder9-Jan-03 2:27

smallcoder

9-Jan-03 2:27

imagine you are coding amutithreads server so all client you create a socket and a new threads to handle the connexion
so imagine that your program is a chat program.
my problem is that i would like to know how can you do for the public message.Indeed one of your threads migth receive a message and how can you talk to other threads containig the connexion , to send the message to ii socket.
So that all other client will receive the message reacieved by this thread's connexion.

if you think that you can't , that means that you can : if you understand this there youn can

PostThreadMessage?

AlexO9-Jan-03 4:30

9-Jan-03 4:30

::PostThreadMessage

smallcoder9-Jan-03 4:59

smallcoder

9-Jan-03 4:59

please can you be more relevant please i'm so confious may be a piece of code

if you think that you can't , that means that you can : if you understand this there youn can

AlexO9-Jan-03 5:35

9-Jan-03 5:35

MSDN : MultiSoc : Illustrates Using Sockets in Multiple Threads

MSDN(SDK) : Power Outlets in Action: Windows Sockets

AlexO9-Jan-03 5:38

9-Jan-03 5:38

MSDN: CHATSRVR Sample: Demonstrates a Windows Sockets Server

smallcoder9-Jan-03 6:41

smallcoder

9-Jan-03 6:41

i did not find the mutliSoc article can you give me the link please

if you think that you can't , that means that you can : if you understand this there youn can

AlexO9-Jan-03 7:12

Problem with the registry

9-Jan-03 7:12

http://download.microsoft.com/download/vc60pro/Sample4/1/WIN98/EN-US/MultiSoc.exe

Jochem9-Jan-03 1:31

Jochem

9-Jan-03 1:31

The problem is that all data that i save in the registry is gone after windows (2000) is restarted. All data appears to be ok after the application closes. But after the restart the key is completely gone.

The code used in the app:

Opening the key:
HKEY hKeyRoot = HKEY_CURRENT_USER;
LPCTSTR pszPath = "Software\\Companyname\\My App Name\\Settings"
HKEY hKey;
DWORD dw;

RegCreateKeyEx(hKeyRoot, pszPath, 0L, NULL, REG_OPTION_VOLATILE, KEY_ALL_ACCESS, NULL, &hKey, &dw);

Writing:

int iValue = 8;
LPCTSTR pszKey = "MyInteger";
hKey as returned by RegCreateKeyEx

RegSetValueEx(hKey, pszKey, 0L, REG_DWORD, (CONST BYTE*)&iValue, sizeof(int));

Does anyone know how to prevent this and why it happens?

Thanks

I'm smart enough to know that i'm stupid and i'm stupid enough to think that i'm smart

Joan M9-Jan-03 1:39

Joan M

9-Jan-03 1:39

you must change the REG_OPTION_VOLATILE to KEY_ALL_ACCESS.

Hope this helps...

Jochem9-Jan-03 2:37

Jochem

9-Jan-03 2:37

The KEY_ALL_ACCESS is the next argument

Anonymous9-Jan-03 3:23

Anonymous

9-Jan-03 3:23

I must sleep more! sorry...

Ramu Pulipati9-Jan-03 1:40

Ramu Pulipati

9-Jan-03 1:40

You have to create RegKey using options 'REG_OPTION_NON_VOLATILE' instead of 'REG_OPTION_VOLATILE'.

For more details, Check RegCreateKeyEx API in MSDN.

If you are developing MFC/ATL based app...you can use CRegKey for easy registry access.

Hope this helps.
Ramu

Jochem9-Jan-03 2:39

Jochem

9-Jan-03 2:39

This solves the problem

thanks

Joan M9-Jan-03 1:42

Joan M

9-Jan-03 1:42

this way is how I do it:

HKEY hKey;
int iLength = 0;
CString csPathSubClau = "";

iLength = csNouValor.GetLength();

// Obrir la clau requerida.
csPathSubClau.Format("%s\\%s",m_csPathBase,csSubClau);

RegOpenKeyEx(HKEY_LOCAL_MACHINE,csPathSubClau,0,KEY_ALL_ACCESS,&hKey);
RegSetValueEx(hKey,csValor,0,REG_SZ,(BYTE *)csNouValor.GetBuffer(iLength),iLength);

RegFlushKey(hKey);
RegCloseKey(hKey);