strtok - C / C++ / MFC Discussion Boards

Toni7816-Jul-03 16:08

16-Jul-03 16:08

pHead is NULL that's why you get that error. Is pHead initialized properly? Did you write that part of the code?

// Afterall, I realized that even my comment lines have bugs

When one cannot invent, one must at least improve (in bed).-My latest fortune cookie

Re: Crash

Anonymous16-Jul-03 16:16

Anonymous

16-Jul-03 16:16

pHead is part of the MFC heap allocation code. (dbgheap.c)

I assume Im trashing it somewhere but can't isolate the possible memory leaks in the dlls.

Re: Crash

Toni7816-Jul-03 19:17

Toni78

16-Jul-03 19:17

The error occurs in one of these two functions; _free_dbg() and _msize_dbg(). I can't tell you much, you have to debug the program and find out the places where are you deleting pointers that you are not supposed to. If you want to find out where you have memory leaks, after you run the program in debug mode, at the output screen scroll down the end. If you have any memory leaks it will tell you where they are occuring. It seems to me like the heap is getting corrupted, but I don't know why.

// Afterall, I realized that even my comment lines have bugs

When one cannot invent, one must at least improve (in bed).-My latest fortune cookie

Re: Crash

Jens Doose21-Jul-03 23:42

Jens Doose

21-Jul-03 23:42

If you get this debug assert, than usually you did something wrong with memory you allocated.
Maybe you freed a block of memory twice or similar.

Jens

main( int argc, char *argv[], char *envp[] )

dadacncn16-Jul-03 12:15

dadacncn

16-Jul-03 12:15

the main funtion includes parameters. how can i run the program in VC++?

Re: main( int argc, char *argv[], char *envp[] )

Garth J Lancaster16-Jul-03 12:49

Garth J Lancaster

16-Jul-03 12:49

if you mean you are running it in the Visual C++ IDE, eg with F5 or single stepping with F10/F11, you go 'Project' -> 'Settings', select the 'Debug' tab, and enter the arguments to the program in the 'Program arguments :' box...

HTH

Re: main( int argc, char *argv[], char *envp[] )

dadacncn16-Jul-03 22:51

dadacncn

16-Jul-03 22:51

thank you very much! Rose | [Rose]

i just need it.

strtok

butterbean73016-Jul-03 11:46

butterbean730

16-Jul-03 11:46

This may seem like a weird question but here goes. Is there a way to tokenize a tokenized string? Explanation:

I have an input buffer that I am tokenizing line by line. Once I get that line I need to tokenize it 3 times to get the info on it and then go back to the original buffer and get the next line. This is what I have so far but it only tokenizes the first line of the buffer:

//This gets the first line of the buffer
char *temp_tok = strtok(m_readBuffer, "\r\n");
m_ctrlTextInA.SetWindowText(temp_tok);
******************************************
//this tokenizes the whole line
char* tokA = strtok(NULL, ",");
m_ctrlTextInA.SetWindowText(tokA);

char* tokB = strtok(NULL, ",");
m_ctrlTextInB.SetWindowText(tokB);

char* tokC = strtok(NULL, "\r\n");
m_ctrlTextInC.SetWindowText(tokC);
*****************************************

I know I need some kind of loop around the ****, but I can not figure out the parameters of that loop. once i get those 3 tokens i want to get the next line from the readbuffer and continue doing this until the readbuffer is empty

any suggestions???

Re: strtok

Ryan Binns16-Jul-03 17:16

Ryan Binns

16-Jul-03 17:16

Before you tokenize each line, use strdup to create a copy of the line and then tokenize that. strtok() doesn't work properly when you are performing nested tokenizes. You can try passing multiple characters as separater characters to strtok(), but it might be easier to duplicate the string (and free() it when you're finished).

Hope this helps,

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Env Vars in arg list and Studio

john john mackey16-Jul-03 11:15

john john mackey

16-Jul-03 11:15

help!! I'm confused...

I want to modify my VC++ application so that I can handle environment variables as such:
1) to launch my application (e.g. %MY_VAR%\bin\myapp.exe
2) as arguments to my app (e.g. %MY_VAR%\bin\myapp.exe %MY_VAR%\config\setup.dat
3) other processes launched "as threads" recognize %MY_VAR%

I have made some coding changes in my app's InitInstance() function to immediately resolve the environment variable. I do this like:

CWinApp *app = AfxGetApp();
if ((app->m_lpCmdLine, '%') != NULL)
{
// ExpandEnvironmentStrings(...), but I wrote my own
ResolveEnvVars(app->m_lpCmdLine); // resolves string in place
}
if (strchr(__targv[1], '%') != NULL)
{
ResolveEnvVars(__targv[1]);
}

// Parse command line for standard shell commands,DDE,file open -- WIZARD
CCommandLineInfo cmdInfo;
ParseCommandLine(cmdInfo);

PROBLEM -- I am having problems getting it to work, having problems using the DEBUGGER.

If I try to use the debugger while in STUDIO, it doesn't like me to supply %MY_VAR% in the arguments list. Is there a way to use %MY_VAR% format in the edit fields of the DEBUG Settings page???

Please help (aleviate my confusion).

Thanks.
Johnny

Hiding controls in the CFileDialog

GloriousBlues16-Jul-03 10:45

GloriousBlues

16-Jul-03 10:45

I can't find a way to hide the list view inside of the file open dialog. I can hide all of the controls except for that one. Does anybody know how to do it?

I've derived a class from CFileDialog, and in OnInitDialog I try to hide controls:

GetParent()->GetDlgItem(edt1)->ShowWindow(SW_HIDE); // This works.<br />
GetParent()->GetDlgItem(lst1)->ShowWindow(SW_HIDE); // This doesn't.

What's funny is that I can resize the list box using GetParent()->GetDlgItem(lst1).

What's even funnier is if I try to show the list control, it disappears:

GetParent()->GetDlgItem(lst1)->ShowWindow(SW_SHOW);

Thanks for helping.

Dave

How to make an automated phone call?

Alvaro Mendez16-Jul-03 9:52

Alvaro Mendez

16-Jul-03 9:52

My wife has asked me to write an app that will call her cell phone and when she picks up, "speak" a prerecorded message into it. It would be nice to detect if I get her voice mail, so I can press # and then leave the same message there.

I'm not sure how to do this. I've already prepared the message into several MP3 files on my computer. I can use C++ or C# (preferrably), but I don't know what libraries to use for making the phone conversation happen. It would also be nice if I could somehow make the call through an Internet connection, but if that's too complex, I'll settle for dialing out through my modem.

I appreciate any guidance.

Regards,
Alvaro

If you want to get to the top, prepare to kiss a lot of bottom. -- despair.com

Re: How to make an automated phone call?

Ranjan Banerji16-Jul-03 10:51

Ranjan Banerji

16-Jul-03 10:51

This may help. Sorry always forget how to do the clickety. Smile | :)

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tapi/tapi3/telephony_application_programming_interfaces.asp

Re: How to make an automated phone call?

Ranjan Banerji16-Jul-03 10:58

Ranjan Banerji

16-Jul-03 10:58

This is better. Now you have me interested in doing this. Smile | :)

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnppc2k2/html/simpletapi.asp

or

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dntapi/html/msdn_ctapic.asp

To MFC or NOT to MFC that is the question.

John R. Shaw16-Jul-03 9:48

John R. Shaw

16-Jul-03 9:48

I wrote my own programable syntax coloring text editor a while back and wish to make the editor (and document) portion into a comercial product (a.k.a. DLL, ActiveX).

The question are:
1) Should I convert it to non-MFC dependent code. (not MFCxx.dll dependency)
2) If converted should I make it use UNICODE internaly, regardless of OS, or continue the need to create UNICODE and non-UINCODE version.

Any ideas would be appriciated.

Why did I write it?
1) I needed a programable text editor for future projects that provided functionality not available any where else.
2) I wrote it because I could! It is the best way I know how to learn.

INTP

Re: To MFC or NOT to MFC that is the question.

Code4Food16-Jul-03 9:56

Code4Food

16-Jul-03 9:56

It depends what you are looking for. If you want a quick time to market, but high overhead cost (computer usage) then go with MFC. However, you can also choose ATL which is much leaner and write your control in that, since it is a templated library it will only compile and link the necessary code, unlike MFC which give you everything. Also if you want a smaller files size ATL would be nice, and when I say ATL you can program it in straight "C" for all that matters I just find ATL faster to write components (none of my components are commercial, all of them are for in house use only, you may wish to wait for the opinion of someone who has written a commercial project)

Also grats on writing it. To tell you honestly one of the contractors I work with just bought a text tool like this himself, I think there is a viable market for it.

Code4Food
----
"There is no try; only do or do not"
-Yoda

Re: To MFC or NOT to MFC that is the question.

Ryan Binns16-Jul-03 17:24

Ryan Binns

16-Jul-03 17:24

John R. Shaw wrote:
2) If converted should I make it use UNICODE internaly, regardless of OS, or continue the need to create UNICODE and non-UINCODE version.

If you use Unicode internally, you'll get heaps of problems trying to run in on Win9x. You could attempt it, but I'd probably run with two different builds. if you use TCHAR and the preprocessor, you should be able to use (almost) the same code for both builds.

John R. Shaw wrote:
1) Should I convert it to non-MFC dependent code. (not MFCxx.dll dependency)

Thats up to you, really. If it's non-MFC dependent, then both MFC and non-MFC programmers can use it. But, MFC programmers may not like it because it doesn't fit in with the Doc-View model without extra work by them - it's not a drop-in solution.

My suggestion would be to drop the MFC dependency, but create a simple MFC wrapper that makes it look like a CView - allowing everyone to use it without problems.

Ummm, just in case you're wondering, yes, I am feeling very backwards and upside-down today - shouldna drank so much last night... Unsure | :~

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

How to detect an USB Mass Storage or Digital Camera connection

Member 30919816-Jul-03 9:28

Member 309198

16-Jul-03 9:28

Hi all,

I am writing a small utitlity to run as a system tray application. I would like to be notified when a USB device of the type USB Mass Storage or Digital Camera is connected to the computer. Once my application receives this event, it will prompt the user if they want to copy the files from the device to the hard drive. Is there any sample code on how I can achieve this with my application? Many thanks in advance.

Tuan

registry api

YaronNir16-Jul-03 9:09

YaronNir

16-Jul-03 9:09

Hi all, does the registry api functions refer to window messages behind the scences????

i.e - combo box function : AddString, eventually calls to CB_ADDSTRING message....

i am looking for the same for all the registry api functions such as:
RegOpenKeyEx,
WritePrivateProfileString
etc....

thanks

Yaron

Re: registry api

David Crow16-Jul-03 9:35

David Crow

16-Jul-03 9:35

I do not understand your question? "Do the registry APIs refer to Windows messages" makes no sense. Please explain in more detail.

Re: registry api

YaronNir17-Jul-03 4:20

YaronNir

17-Jul-03 4:20

i was just wondering how does the application regmon works (it monitors all the registery read/writes.....

can u help in explaination?

thanks
Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: registry api

David Crow17-Jul-03 5:23

David Crow

17-Jul-03 5:23

YaronNir wrote:
can u help in explaination?

Not as good as the authors themselves.

http://www.sysinternals.com/ntw2k/source/regmon.shtml

Re: registry api

Iain Clarke, Warrior Programmer16-Jul-03 10:27

Iain Clarke, Warrior Programmer

16-Jul-03 10:27

Your question is trying to compare apples and screwdrivers...

There is no Win32 SDK (*) function AddString. You are right in that you need
to use SendMessage (hWndCombo, CB_ADDSTRING, ...);. The AddString you are
thinking of is a member function of the CComboBox class in MFC which wraps the
underlying SDK for you.

RegOpenKeyEx etc are actual SDK functions in their own right.

Clear?

Iain.

(*) Which I assume you mean by API...

Re: registry api

YaronNir17-Jul-03 4:20

YaronNir

17-Jul-03 4:20

I agree with what you are saying.

i was just wondering how does the application regmon works (it monitors all the registery read/writes.....

can u help in explaination?

thanks
Yaron

Ask not what your application can do for you,
Ask what you can do for your application

Re: registry api

Iain Clarke, Warrior Programmer17-Jul-03 4:38

Iain Clarke, Warrior Programmer

17-Jul-03 4:38

A few seconds reading of the sysinternals[^] website gives the following explanation of how regmon works:

How Regmon Works  
The heart of Regmon on Windows 9x is in the virtual device driver, Regvxd.vxd. It is dynamically loaded,
and in its initialization it uses VxD service hooking (see our May 1996 Dr. Dobb's Journal article on VxD
= service hooking for more information) to insert itself onto the call chain of 16 registry access functions
in the Windows 95 kernel (Virtual Machine Manager). All registry activity, be it from 16-bit programs, Win32
applications, or device drivers, are directed at these routines, so Regmon catches all registry activity
taking place on a machine. 

On Windows NT, 2000 and XP the Regmon loads a device driver that uses a technique we pioneered for NT called
system-call hooking. When a user-mode component makes a privileged system call, control is transfered to a
software interrupt handler in NTOSKRNL.EXE (the core of the Windows NT operating system). This handler takes
a system call number, which is passed in a machine register, and indexes into a system service table to find
the address of the NT function that will handle the request. By replacing entries in this table with pointers
to hooking functions, it is possible to intercept and replace, augment, or monitor NT system services.

Regmon, which obviously hooks just the Registry-related services, is merely one example of this capability in
action.

On Windows .NET Server Regmon takes advantage of a new operating system Registry callback mechanism to
register for and receive information about Registry accesses as they occur. When you run Regmon on .NET
Server it loads a version of the Regmon driver utlizing the callbacks.

When Regmon sees an open, create or close call, it updates an internal hash table that serves as the mapping
between key handles and registry path names. Whenever it sees calls that are handle based, it looks up the
handle in the hash table to obtain the full name for display. If a handle-based access references a key
opened before Regmon started, Regmon will fail to find the mapping in it hash table and will simply present
the key's value instead.

Information on accesses is dumped into an ASCII buffer that is periodically copied up to the GUI for it to
print in its listbox.

In short, it cheats, and grabs the information at a very low level. Not for the faint hearted...

Iain.

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