How to create a VC program to read text - C / C++ / MFC Discussion Boards

How to save the structure of a tree view?

Kayembi19-Sep-03 6:34

19-Sep-03 6:34

Hi,

I am nearing the completion of my app (and a big thank you to everyone here who has helped me so far - I've received a lot of help and do really appreciate it). I am currently working on saving project files, but there is one aspect of my app I have no idea how to go about saving, and would be very grateful for some advice.

Part of my app works a little like Windows Explorer. On the left there is a folder tree and on the right a file list. The user can create a file tree containing a number of files, and upon hitting a "Build" button, the folder tree he or she has defined is created on disk, and the specified files copied into these folders (you may wonder what the advantage of this method is over just letting my user do all this in Windows Explorer, but trust me that this makes sense in the context of the rest of my app - for instance, the paths of the folders are stored as command-line parameters etc).

So far, so good. However, when my user goes to save a project, the project must save the directory tree that he has created, and it is this that I do not know how to achieve. The directory tree is just a tree view - ie. a sequence of HTREEITEMs. On saving a project, the app needs to look at the tree view and save the structure, which can of course consist of an unlimited number of HTREEITEMS organised in any order with various properties. Upon loading a project, the app needs to be able to reconstruct this tree view just as it has been saved.

I thought of using a string array to hold the paths of the folders and try to reconstruct them from the paths, and using a number array to hold the properties, but this seems a very long-winded way of doing it.

Can anybody suggest a good method of dealing with this? I'm using the straight Windows API with _no_ MFC, but that shouldn't make too much difference as I'm not asking for code so much as for ideas about how one goes about storing information about something as complex and arbitrary as a customisable tree view.

Many thanks for any help,
KB

Re: How to save the structure of a tree view?

l a u r e n20-Sep-03 6:04

l a u r e n

20-Sep-03 6:04

i would think u have to save the path names of the selected files along with the hierarchy info ... the tree view is only holding refs to those things in effect anyways

u should consider saving to an xml file as it is designed to represent hierarchical data after all
Smile | :)

"there is no spoon"
biz stuff about me

Better way of changing window title and icon at run-time?

Kayembi19-Sep-03 6:21

Kayembi

19-Sep-03 6:21

Hi,

I have written an app that controls another application - it basically packs its files, allows customisation of its window title and icon, adds an alternative splash screen and various other features specific to the app. The application my app controls is third-party, so I have no access to its code.

Everything is working fine, but I was wondering if there is a better way of changing the icon and window name at run-time than the methods I am currently using.

(Incidentally, I am using the straight Windows API with _no_ MFC.)

To change the window title, I have written this loop:

<br />
//this loop finds the third party app window:<br />
while(thirdParty_hWnd == 0)	//loop until window is found<br />
{<br />
	//app was started using ShellExecuteEx - check it is still running:<br />
	if(WaitForSingleObject(thirdPartyApp.hProcess,0)==WAIT_TIMEOUT)<br />
	{		<br />
		thirdParty_hWnd = FindWindow("thirdpartyappclass_mainwin",NULL);<br />
<br />
		SetWindowText(thirdParty_hWnd, "New Win Title");	//rename window<br />
	<br />
		if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))<br />
		{<br />
			TranslateMessage(&msg);<br />
			DispatchMessage(&msg);<br />
		}<br />
	}<br />
	else<br />
	{break;}	//3rd party app has closed<br />
}<br />

The problem here is that the window title of the third party app does not appear in the window immediately, so my code sets the title before the app does. This means that the title is changed back a second or less after this code has been executed, meaning that I have to check the window title again in my next loop and change it back if necessary, like this:

<br />
char title_str[MAX_PATH];<br />
<br />
//this loop handles the main stuff now that the window has been found:<br />
while(thirdParty_hWnd!=0)<br />
{<br />
	if(WaitForSingleObject(thirdPartyApp.hProcess,0)==WAIT_TIMEOUT)<br />
	{<br />
		//set window text:<br />
		GetWindowText(thirdParty_hWnd,title_str,MAX_PATH);<br />
		if(strcmp(title_str,"New Win Title")!=0)<br />
		{<br />
			SetWindowText(thirdParty_hWnd,"New Win Title);<br />
		}<br />
<br />
		//message loop here<br />
	}<br />
}<br />

Although this works, the main problem is that this means the window title is set to what I want ("New Win Title" in the example) at first, then it reverts to the default app title briefly before getting changed back to, for instance, "New Win Title". Does anybody know of a better way of doing this, so that the original app title would never show at all? (Also, please bear in mind that I a relative novice, so feel free to tell me where my code is shoddy and suggest improvements.)

To change the icon, I use the following code:

<br />
SendMessage(thirdParty_hWnd, WM_SETICON,(WPARAM)ICON_BIG, (LPARAM)(HICON)NewIconBig);<br />
SendMessage(thirdParty_hWnd, WM_SETICON,(WPARAM)ICON_SMALL, (LPARAM)(HICON)NewIconSmall);<br />

(where NewIconBig and NewIconSmall are HICONs that point to an .ico file.

The only problem is that for this to work, the above code has to be contained in a while() loop (otherwise the icon is lost when you alt-tab etc). Although this works fine, looks good, and I have not noticed any slowdown, I am aware that this is probably not good practice to have a message sent to another window constantly. Is there anyway I can change the icon without having to continually tell the other window? (Note that in this case I cannot use an icon changer as the third party app has a built in checker that will cause the program to crash if any of its resources are changed.)

Any suggestions for improvements to my current methods would be much appreciated.
Many thanks,
KB

Tool Tip Appearance Time

Marty1020304019-Sep-03 6:11

Marty10203040

19-Sep-03 6:11

Hi,

I have been successful in getting tool tips to work with modeless dialogs.
I have a dialog with one button on it. I have attached tool tips to both the dialog and the button. When I put the mouse over the dialog, the tool tip comes and stays for a while as in standard windows.
However, when I put the mouse over the button, the tool tip comes up and quickly disappears. How can I make the tool tip for the button behave the same way as the dialog?

Thanks.

Martin

mail verifier

Max Santos19-Sep-03 5:53

Max Santos

19-Sep-03 5:53

I guys

i have a question

can anyone point me to a piece of code that verifys if a mail is valid??

i have a mail list and i have to verify if the emails still exist.

I know that i have to connect to the mx server and ask to login, is the mail exist the server asks the password, if the mail dont exist the server fires a error

but i fellbehind on schedule and it wound be great if someone poit me to a working piece of code Big Grin | :-D

thanks

MSN:maxsnts@hotmail.com

Installshield DLL Problem

Anonymous19-Sep-03 5:42

Anonymous

19-Sep-03 5:42

Hi!

I have InstallShield for Visual C++ 6.0 and today is the first time I have tried to use it.

Quickly I had my executable in an installable format but it also needs some DLLs I have written. I create a file group called "Libraries" and put my DLLs in it and then mark the file type as containing all self-registering files.

So I have now two file groups:

1. Program Executables
2. Libraries

I build my project and install it. Everything in "Program Executables" is copied to my directory but "Libraries" are ignored. How do I get InstallShield to install my DLLs and register them?

Also can anyone tell me how to tell InstallShield to create some registry entries.

Last, does anyone know a quick tutorial?

Thanks to all!

Installshield

Anonymous19-Sep-03 5:36

Anonymous

19-Sep-03 5:36

Hi!

I have Installshield for VC++ 6.0.

How to create a VC program to read text

harshsingh19-Sep-03 5:13

harshsingh

19-Sep-03 5:13

I am new to the field of VC++....can anyone please tell me as how to create a program that reads a text file, line by line....and if possible how to read each line starting from a particular character to a specified number(of characters)

Re: How to create a VC program to read text

keegan19-Sep-03 5:41

keegan

19-Sep-03 5:41

one place to start would be to look at msdn.microsoft.com for iostream and fstream.

*.*
cin >> knowledge;

Re: How to create a VC program to read text

harshsingh21-Sep-03 18:24

harshsingh

21-Sep-03 18:24

Hi! Keegan
I realy don't understand what you wanted to say...was just going through what you told me , but to no avail.....

Re: How to create a VC program to read text

keegan21-Sep-03 20:58

keegan

21-Sep-03 20:58

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang98/html/_iostream_fstream.3a3a.fstream.asp

thats an insane description of fstream. I'll show you an example of one way to write to files here:

string filename = "data.txt";      //the name of the file we want to input from / output to
	ifstream inFile(filename.c_str());    //'sets up' input from a file
	ofstream Out;                        //sets up output to a file

        //input a word from a file:
        string word;
        inFIle >> word;

        //output that word to a file:
        Out << word;

ifstream and ofstream are more or less identical in terms of use to cin and cout. Once you define the input and output streams, they work the exact same way (more or less). If you have any more questions, feel free to email me.

*.*
cin >> knowledge;

Re: How to create a VC program to read text

PremL19-Sep-03 5:48

PremL

19-Sep-03 5:48

Consider using a CStdioFile for reading your file. Construct an instance of the class for the file you want to read from. You can call the ReadString method on it to get a line of text from your file into a CString. Then you can make use of all the methods of CString to get to only the part of the line in the string you are interested in. Technically you are reading the whole line. You then parse the string for what you need.

Lorenz Prem
Microsoft Corporation

Modal dialog does not come to the foreground

Salvador Dali19-Sep-03 5:07

Salvador Dali

19-Sep-03 5:07

Hello again,

I have a document-view app that uses a standard windows timer to display some animation on the view. The problem is, when I set the timer period to less than 200 msec (say 100 msec) some (or
all, I'm not sure) modal dialogs do not come to the foreground
and I have to press the "Alt" key to make them visible.
They all have the "Foreground" attribute set in the resource editor.
I read an article somewhere else in codeproject about attaching the main window thread to the dialog, but I don't get it.
When should I do this? Before I call DoModal() in my view, in the dialog's OnInitDialog() or what? Confused | :confused:

Thanks in advance.

Re: Modal dialog does not come to the foreground

JWood19-Sep-03 5:17

JWood

19-Sep-03 5:17

You could try creating the dialog with WS_TOPMOST in the style parameter

add code to standard Save

doctorpi19-Sep-03 4:51

doctorpi

19-Sep-03 4:51

Hi guys
How can I add code to the Standard Save on a menu of a SDI app?
Best Regards
Dr.Pi

Re: add code to standard Save

JWood19-Sep-03 5:24

JWood

19-Sep-03 5:24

Override OnSaveDocument

Re: add code to standard Save

Dangleberry19-Sep-03 5:25

Dangleberry

19-Sep-03 5:25

If your using MFC override the Serialize() function in your derived class, call the base class function first and then add your code. I'm assuming you've set up the message map stuff for the standard save menu button correctly. If your using win32, then it depends...we need more info Smile | :)

Re: add code to standard Save

Dangleberry19-Sep-03 5:29

Dangleberry

19-Sep-03 5:29

Just noted JWood's response, if you want to do something extra before or after a save (pop a dialog box etc. then override OnSaveDocument(), but if you want to save extra stuff or mess with the io methods you'll need to override Serialize(). Hope this helps you. Check either of these methods out in MSDN for a deeper explanation. Poke tongue | ;-P

Re: add code to standard Save

doctorpi19-Sep-03 5:32

doctorpi

19-Sep-03 5:32

Thanks to everybody, I'll take a look on Serialize.
I had to save thinks like bool,float,arrays etc.. is then Serialize the place to do it? And then, later when I wanted to read it, is in Serialize too?
Best Regards
Dr. Pi

Re: add code to standard Save

doctorpi19-Sep-03 5:42

doctorpi

19-Sep-03 5:42

Replying to myself and waiting your answer.
I had to override serialize in each class where I have data to save, and then automatically when I call Save, all this data will be saved, and when I call Open, all this data will be retrieved (obviously if I implement correctly the serialize).

Is something like this?
if (ar.IsStoring())
{ // storing code
ar<<m_ncode
="" }
="" else
="" {="" loading="" code
="" ar="">>m_nCode
}

It doesnt' matter what m_nCode is?
Bast Regards
Dr.Pi

Disabling/Enabling a serial port

neffc19-Sep-03 3:41

neffc

19-Sep-03 3:41

I know how to do this through explorer and how to 'open' and 'close' IO to the serial ports but I actually want to disable them.

How would I do this progmatically??

Re: Disabling/Enabling a serial port

valikac19-Sep-03 4:50

valikac

19-Sep-03 4:50

One solution is to disable the COM port. Check out this reference at MSDN.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/device_management_functions.asp

I am not familiar with serial ports, but try openning a connection and keep it alive at all time. That may block any I/O.

Kuphryn

CompareNoCase fails

r i s h a b h s19-Sep-03 3:36

r i s h a b h s

19-Sep-03 3:36

dear all,

the following lines of code gives wrong value on windows 2000, but on every other operating systems it works fine

<br />
if (sDir.CompareNoCase("M") != 0)<br />
{<br />
   .....<br />
}<br />

but if i use a variable with value "M"...it works fine.......

any guesses why

Regards

rIsHaBh

Re: CompareNoCase fails

RobJones19-Sep-03 3:40

RobJones

19-Sep-03 3:40

rishabhs wrote:
if (sDir.CompareNoCase("M") != 0)

use this instead..

if(!sDir.CompareNoCase("M"))
{
      // They match
}

Rob

Whoever said nothing's impossible never tried slamming a revolving door!

Re: CompareNoCase fails

David Crow19-Sep-03 4:04

David Crow

19-Sep-03 4:04

rishabhs wrote:
...the following lines of code gives wrong value...

Which means what? What does CompareNoCase() return in this case? What are you expecting it to return?

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