C / C++ / MFC

Re: Button control for exiting a program

29-Aug-02 9:28

AfxGetMainWnd()->PostMessage(WM_CLOSE);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Brad Jennings29-Aug-02 10:04

Brad Jennings

29-Aug-02 10:04

The EndDialog thing didn't do exactly what I wanted it to do. It got rid of the dialog but it was still running in the background. This caused a nifty blue screen of death the next time I executed it. This works much better, can't believe I didn't think of it before. Thanks.

File API Question

Nick Parker29-Aug-02 8:37

Nick Parker

29-Aug-02 8:37

Is there an API that exists where I can specify a main file and then another file, where the second file just gets appended to the first file. I am looking for something like this.

CString m_MainFile = "C:\main.txt";
CString m_AnotherFile = "C:\another.txt";

AppendMyFiles(m_MainFile, m_AnotherFile);

In this case the contents of another.txt are appended to main.txt.

Thanks in advance. Smile | :)

Nick Parker

Carlos Antollini29-Aug-02 8:48

Carlos Antollini

29-Aug-02 8:48

I don't believe.
Only need to open the twice files, the first in append mode, Read the second and write the first. in only four or five lines, you can do that...

Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Joaquín M López Muñoz29-Aug-02 9:02

29-Aug-02 9:02

If you're defintely not in the mood of writing your own routine, as Carlos suggests, this might do:

CString m_MainFile = "C:\main.txt";
CString m_AnotherFile = "C:\another.txt";
CString m_command;
m_command.Format("copy %s +%s %s /Y",(LPCTSTR)m_MainFile,(LPCTSTR)m_AnotherFile,(LPCTSTR)m_MainFile);
system(m_command);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

(Use CreateProcess instead of system for best results.)

Brian Delahunty29-Aug-02 10:06

Brian Delahunty

29-Aug-02 10:06

Joaquín M López Muñoz wrote:
(Use CreateProcess instead of system for best results.)

It's like a little footnote.. I like it Smile | :)

Regards,
Brian Dela Smile | :)

Carlos Antollini29-Aug-02 11:08

Carlos Antollini

29-Aug-02 11:08

Joaquín, I thinked that, but I dont like to depend of the os, to do something like the following...

command.Format("mk %s", mydir); 
or 
command.Format("del %s", myfile);

system(command);

Sounds like. Turn off the computer when you try to close the application....

I think that this is a good point for a pool....
When you have a os function that makes the work, you prefere to write several lines of code or make a system call?

Saludos....

Carlos Antollini.
Sonork ID 100.10529 cantollini

Joaquín M López Muñoz29-Aug-02 11:16

29-Aug-02 11:16

Yes, you're right my solution is seriously weak. I hope the guy was in the mood of writing the routine instead! Smile | :)

When you have a os function that makes the work, you prefere to write several lines of code or make a system call?

Write the code, unless it's unmanageable complex.

Saludos

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Database recommendations and questions

Brian Delahunty29-Aug-02 10:07

Brian Delahunty

29-Aug-02 10:07

If you want I'll write you a quick little AppendMyFiles("first_file", "second_file") function. Just email me if you want it. Smile | :)

Regards,
Brian Dela Smile | :)

Chris Hambleton29-Aug-02 8:06

Chris Hambleton

29-Aug-02 8:06

Hi,

I'm looking for a database who's drivers come standard with Windows (Access??) (if possible) so I don't have to distribute them. I have an application that I'd like to start using with a database instead of files, but I don't want to distribute a bunch of drivers.

I've looked into MySQL and it seems that the redistrution package would be at least a couple of megs. MSDE is free, but it has the same size issues...

Do you have any recommendations? I'm familiar with using SQL, but not with redistributing databases and drivers and all that... it would be nice if I could just distribute a empty database with all the tables.

Also, I'm assuming I need to create an DSN entry in each users ODBC settings to run the new db, right? How would I go about creating these at runtime/install time?

Thanks,

Chris

Re: Database recommendations and questions

Carlos Antollini29-Aug-02 8:27

Carlos Antollini

29-Aug-02 8:27

dependes, you can use SQL Server, In that case you need to distribuit a database script, for install de server. In teh client workstation, you don't need to create a DSN entry. You can use a connection string without use a dsn. only specifying the database, servername, username, password, etc....

Regards....

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: Database recommendations and questions

Joel Lucsy29-Aug-02 13:19

Joel Lucsy

29-Aug-02 13:19

Windows XP comes with DAO 3.6 preinstalled, all others have nothing. You might try SQLite at http://www.hwaci.com/sw/sqlite/
I've used it before and it works quite well. No nice fancy wrappers tho (I have one internally,but it's certainly not ready for primetime).
Small footprint (200k roughly), most SQL syntax, single file, transactions.

Joel Lucsy (jjlucsy@ameritech.net)

Listview problems!!! AAAAAAAaaaaaaaaa

Ray Cassick29-Aug-02 7:57

Ray Cassick

29-Aug-02 7:57

Anyone ever have a problem where, for some reason, they can no longer add any subitems to a listview?

I have been banging my head on this for two days now. The code is as follows:

for (int i = 1; i <= num_vbpc_channels; i++)<br />
	{<br />
	// Insert the first item<br />
	lvi.mask =  LVIF_IMAGE | LVIF_TEXT;<br />
	strItem.Format(_T("Item %i"), i);<br />
		<br />
	lvi.iItem = i;<br />
	lvi.iSubItem = 0;<br />
	lvi.pszText = (LPTSTR)(LPCTSTR)(strItem);<br />
	lvi.iImage = i%8;		// There are 8 images in the image list<br />
	m_cListCtrl.InsertItem(&lvi);<br />
<br />
	strSubItem1.Format(_T("%s"), "Past");<br />
	strSubItem2.Format(_T("%s"), "Past");<br />
<br />
	// Set subitem 1<br />
	lvi.iSubItem =1;<br />
	lvi.pszText = (LPTSTR)(LPCTSTR)(strSubItem1);<br />
	m_cListCtrl.SetItem(&lvi);<br />
<br />
	// Set subitem 2<br />
	lvi.iSubItem =2;<br />
	lvi.pszText = (LPTSTR)(LPCTSTR)(strSubItem2);<br />
	m_cListCtrl.SetItem(&lvi);<br />
<br />
        }

Most of you will probably notice this code as it is (for the most part) a copy/paste from one of the MFC examples here. It works for a few runs then simply stops adding sub items. The first column of items always gets added...

UGH!

Joaquín M López Muñoz29-Aug-02 8:29

29-Aug-02 8:29

The code seems OK. Matt Weagle, in his article Using the List Control[^] shows some code that is almost identical to yours. You might try downloading the demo project he provides to try to determine the differences that are causing the strange behavior in your app.

PS: Your loop begins at 1 instead of 0. I don't think this is where the error stems from, but definitely you should begin at zero.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Michael Dunn29-Aug-02 9:02

Michael Dunn

29-Aug-02 9:02

Items start with number 0, not 1, I'm surprised you're seeing any subitems at all actually.
Zero-fill the LVITEM struct before setting its members. Not doing so can make the code fail in release mode. (Even though the mask field is there to indicate which members to use, the control still validates some of the other fields.)
Also, your (LPTSTR)(LPCTSTR) cast of a CString is incorrect code (although it happens to work here because the string isn't modified).

--Mike--
Just released - RightClick-Encrypt v1.4 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Ray Cassick29-Aug-02 9:28

Ray Cassick

29-Aug-02 9:28

Michael Dunn wrote:
Also, your (LPTSTR)(LPCTSTR) cast of a CString is incorrect code (although it happens to work here because the string isn't modified).

This is code directly out of an article from here. The article is cited in the message above.

Why is it incorrect? Actually, why is it used in the first place. You have to forgive me, I am an emerging C++/MFC programmer....

Michael Dunn29-Aug-02 9:43

Michael Dunn

29-Aug-02 9:43

It is incorrect because CString provides a read-only array. If you want to modify the string, you have to use CString methods or overloaded operators like +=.
Casting to LPCTSTR is fine, because CString provides that conversion itself, and still results in a read-only pointer. Casting that to a LPTSTR (which is not const) gives you a read-write pointer to a read-only buffer. It compiles (because casts override type checking), and it even runs in your case, but that doesn't make the code correct.
The correct way to get a non-const pointer to the CString's buffer is GetBuffer().

--Mike--
Just released - RightClick-Encrypt v1.4 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Joaquín M López Muñoz29-Aug-02 9:33

29-Aug-02 9:33

Also, your (LPTSTR)(LPCTSTR) cast of a CString is incorrect code

It is perfect code, no cast is superfluous. pszText is a non-const LPTSTR (because some CListCtrl methods use it as an out parameter).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Tomasz Sowinski29-Aug-02 9:38

Tomasz Sowinski

29-Aug-02 9:38

Joaquín M López Muñoz wrote:
It is perfect code, no cast is superfluous.

Agreed. LVITEM::pszText is non-const, because structure is used in both LVM_SETITEM/LVM_GETITEM contexts.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Michael Dunn29-Aug-02 9:47

Michael Dunn

29-Aug-02 9:47

Joaquín M López Muñoz wrote:
It is perfect code

Hardly. See my post above.
Encouraging code like that will get people into trouble, because if they use that unsafe cast everywhere, it will eventually break, and they'll wonder "why isn't this working? I copied it from XYZ and it worked fine there".
I prefer to show people the correct code (CString::GetBuffer()) so they learn the proper way to do things, instead of unsafe hacks that just happen to work in some situations.

--Mike--
Just released - RightClick-Encrypt v1.4 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

HELP!!!

Nitron29-Aug-02 7:18

Nitron

29-Aug-02 7:18

Ok, so I'm quasi-newb, and my apps are starting to outgrow dialog-based interfaces. With multi top-level windows and window position sizing algorithms, I meagerly try to simulate a doc/view interface only because I finally know how to pass data between dialogs and have no clue how to use doc/view. Most of my stuff is graphing apps using National Instruments Active-X controls (starting to outgrow these too). I feel I end up doing things the very hard way, but I learn more each time through. Also, the data files I deal with are usually giant csv files. I have implemented a serializing vector routine and the fun zlib compression library, so my file IO is coming along... Anyway, can anyone point me to a simple doc/view sample where someone who is used to setting things up on OnInitDialog() and laying things out on a dialog (using ETSManager to resize them) can learn how the doc/view works. I guess my questions are so basic, they may seem trivial to most, but I don't even know how to get a control in a view and display it if it's not a dialog app Cry | :((

Sad, I know. But at least I keep trying...

Thanks all!

Nitron
_________________________________________--
message sent on 100% recycled electrons.

Re: HELP!!!

Joaquín M López Muñoz29-Aug-02 7:26