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Hi..
many API functions that take char* as an argument takes the lenghth of the buffer as well..
you can do the same, pass the pointer and the length to the function...
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Example is kind of C, in C++ you should probably use string class of some kind (_bstr_t, std::(w)string). NOTE The function does not check for 0 length.
bool member_function(LPCTSTR szSource, LPTSTR* szDestination)
{
if(!szSource)
return false;
size_t nSize = _tcslen(szSource);
*szDestination = new TCHAR[nSize+1];//NOTE: if passed string is not NULL, we just lost memory
_tcscpy(*szDestination, szSource);
return true;
}
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but but but ....
won't I need to call delete on the new so that there is no memory leak? If so, it would seem foolish to delegate this to the caller of the function.
Paul
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Hey, You did not ask if it was foolish, you ask how to do it
Actually, it is a design decision you have to make.
Deleting inside the function might present additional problems
1. What if the user of the function passes uninitialized pointer?
2. What if the user of the function passes the pointer which initialized to something that can not be deleted (_T("static string"))?
Windows APIs usually leave memory deallocation to the client of the function. But again - it is your decision.
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thanks for your time !!!
Paul
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Hi guys,
when I use out assembly like this
//MSDN Sample
__asm
{
mov al, 2
mov dx, 0xD007
out dx, al
}
in a function, every thing is ok and run under 98
but when I run this in Windows2000 I get error like:
Unhangled exeption in Test.exe : 0xc0000096: Privilaged Instruction.
please tell me , what I must do?
My program must work under win2000
Thanx before.
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this is a very wild guess, but I think that the out instruction is privileged under NT systems (NT4, W2K as well as XP).
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geo_m's wild guess is right: under NT-based OS'es (NT3.5-4, W2K, XP) you have no direct access to the hardware.
Generic devices (Serial port, LPT, etc.) can be accessed like files by using special names (See CreateFile documentation).
For custom devices, you'd need a device driver that runs in kernel mode and talks to the device, and you user mode program just talks to the driver. But writing a driver is a separate business alltogether...
Those who not hear the music think the dancers are mad. [sighist] [Agile Programming]
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Congratulations, you just happened to be awarded th "I post a dumb thread and answer it" prize 
~RaGE();
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It's depressing to me that people this stupid can still work out how to use a computer. Bring back 1985, that's what I say.
Christian
No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002
C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002
Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not
as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002
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In a VC6 macro file (*.dsm), can I automatically assign a shortcut to a certain macro?
(e.g. in an "OnLoad" even or something...)
Those who not hear the music think the dancers are mad. [sighist] [Agile Programming]
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Hi,
I added two CDialogBars to a CBRS_RIGHT vertical rebar, but neither they stretch to fit the frame height, nor the remaining space is erased. Everything is however fine when I lay this rebar onto the CBRS_BOTTOM 
Are there any CCS, CBRS, RBS or RBBS flags I should additionally set? 
Regards,
BB
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1.How to find wheather the system is locked
2.how to find internet connectivity is there
Pl reply
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hi,
1: check in network places if you can see other computers in the network the computer is not locked, if thats what u r looking for.
2: for internet connectivity go
start-> run-> ping www.codeproject.com -t will show you the real excahne of bytes and time taken. if request times out then there is no internet connectivity.
cheers,
Himanshu
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I have a TreeView like "Favorites" in ie.
I want show the name of the web site like "CodeProject" and associate an URL "http://www.codeproject.com" who is hiding.
i think i can do this with setitemdata but the value associated is a DWORD i can't associate a CString .
if someone know how i can do ....
PS excuse my english 
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Put your CString in a table, list, vector, etc ... and save the index of the entry in the DWORD.
~RaGE();
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thx
How can i convert a POSITION to DWORD ?
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Maybe like this :
POSITION pos;
DWORD d=(DWORD)pos;
I'm not sure because i do not know how Windows handles POSITION, so it may be more complicated.
Why would you like to do such a thing ?
Pls note that a DWORD is a 32 bit value, so you can cast any kind of data into it and get them back after. You also can store pointers on structs into it. I consider the Data provided with CTreeCtrl to be used with indexes or pointers pointing on Data, not the Data itself.
~RaGE();
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thx
i already try this solution but don't work 
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allocate a new CString dynamically, and store a pointer to it in the tree item
disadvantage: You are responsible for deleting the CString * when the treeitem is deleted!
CString * pURL = new CString(/*the URL string*/);
Set: SetItemData(treeItem, (DWORD) pURL);
Get: CString * pURL = (CString *)GetItemData(treeItem)
Add Notification handler OnDeleteItem, and there
CString * pURL = (CString *)GetItemData(treeItem);
delete pURL;
------------------------------------
Another version, which is nicer if you build the tree incrementally (i.e. items are never renamed / deleted):
use a std::map<htreeitem, cstring="">
Those who not hear the music think the dancers are mad. [sighist] [Agile Programming]
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thx
I try your solution...
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Thank you very much !
it is the good solution it's work fine !;)
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I am having a virtual list control which can load a large number of file items.
I have noticed that main speed issue here is file icon calculation, so I created the separate thread to calculate icon index in background.
But, my problem is following:
- how to communicate changes between the threads
(I used to PostMessage for each calculated icon, but this was slowing down my icon thread enormously)
- how to add icon calculations priority (if the user scrolls to the bottom of the list, those icons must be calculated first)
I welcome any good idea or code pointer.
Thanks in advance.
Miroslav Rajcic
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