Re: global variables - C / C++ / MFC Discussion Boards

Re: how can i repair and compact the access2000 database using ado in vc?

Alexinuk25-Nov-02 3:12

Alexinuk

25-Nov-02 3:12

You can use CDaoDatabase from MFC to do it easily enough. Not sure about ADO though Frown | :(

-Alex

the CDaodatabase dont support access2000

whelk25-Nov-02 14:52

whelk

25-Nov-02 14:52

we want to use ado to realize the popose

-----------------------------
Mr.Whelk
-----------------------------
Zhuhai City ,Guangdong ,China

Toolbar dependent bitmaps in my Popup menus

Mr Bose Dayala24-Nov-02 17:31

Mr Bose Dayala

24-Nov-02 17:31

Hi
can anybody guide me to load Toolbar dependent bitmaps in my popup menu which will appear on RButtonclick on a DialogBox(or Bitmap) in a Formview.will be so thankful if you give me
the code.

thanks and regards

ThomasKennedyBose

Creating Line Count for CRich Edit Control

E324-Nov-02 16:34

24-Nov-02 16:34

Can any body help me i'm try to create in CDocument view an Rich edit control that will that will allow me have a line count on the side when the user type any thing into the edit. Also beside the CRichEdit I want the color to be gray and white for CRichedit. SO i kind of looks like Visual Studio Editor or any coding editor.

Can anybody help me to get this going.

Thanks alot.
Smile | :)

Custom compiler steps...

Matt Gullett24-Nov-02 16:03

Matt Gullett

24-Nov-02 16:03

This is probably a stupid question (I haven't had much sleep in the past 3 days).

How can I tell Visual C++ to perform an extra step when compiling each .cpp file. What I want to do is basically what BoundsChecker does when you perform a compile. You see "compiling something.cpp" followed by a line reading "instrumenting something.cpp".

I know about custom build steps but I can't seem to get this to do what I want???

Re: Custom compiler steps...

C^hris L^osinger24-Nov-02 16:33

C^hris L^osinger

24-Nov-02 16:33

see this: http://www.codeproject.com/string/CXR.asp[^] . step "6" describes how to set up a custom build step.

-c

There's one easy way to prove the effectiveness of 'letting the market decide' when it comes to environmental protection. It's spelt 'S-U-V'.
--Holgate, from Plastic

Smaller Animals Software

global variables

pnpfriend24-Nov-02 15:42

pnpfriend

24-Nov-02 15:42

Hi All.. I have a global variable CArray < struct, struct&> a; declared in the same place as theApp global variable get declared.

I know if I want to use the global variable include in the other .cpp files, I have to call that global in such way
extern CArray<struct,struct&> a;

Then I Rebuild the project, Iand got linking error...
[code]
error LNK2001: unresolved external symbol "class CArray<struct dishinfo,struct="" dishinfo="" &=""> theMenu" (?theMenu@@3V?$CArray@UDishInfo@@AAU1@@@A)
Debug/ResturantSystem.exe : fatal error LNK1120: 1 unresolved externals
[/code]

why do i get error??

Re: global variables

Christian Graus24-Nov-02 16:01

Christian Graus

24-Nov-02 16:01

First of all, to fix this problem, declare the variable extern in your stdafx.h, and declare it in stdafx.cpp. Voila, visible everywhere.

Secondly, DON'T do this. Global variables are a terrible idea. If you must, then at least put them in a namespace. It's far better to make them members of your main window and access them that way.

Finally, you should investigate std::vector, check out the STL articles here on CP. CArray is really a terrible product, and is generally used by people who either don't know about the STL, or are put off by the awful docs in the MSDN. I've solved problem a, and the articles on this site will fix problem b. I think you'll be surprised how much nicer/powerful it is than the stuff that MFC ships.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

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

Re: global variables

pnpfriend24-Nov-02 16:29

pnpfriend

24-Nov-02 16:29

Thank you very much for your explaining and suggestion.. I'll learn about STL..
Thank you Chris...

Re: global variables

Christian Graus24-Nov-02 17:23

Christian Graus

24-Nov-02 17:23

Glad to help.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

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

database

Shotgun24-Nov-02 15:12

Shotgun

24-Nov-02 15:12

whats wrong with my string?
I am trying to find a record in a database where one parameter is partially given ( LIKE 'm_val'). I don't get any database errors, but no info either.

CString m_cat, m_val;

// Build the SQL statement
SqlString = "SELECT * "
"FROM new WHERE cat='";

SqlString += m_cat;
SqlString += "' AND filename LIKE '";
SqlString += m_val;
SqlString += "*'";

Any helps really appreciated

shotgun

Re: database

Christian Graus24-Nov-02 15:17

Christian Graus

24-Nov-02 15:17

I believe the wildcard character is %, that is, I know % works, but I've never tried *. Do your values start with m_val, the ones you expect to find ? Are they in the table called 'new', and in the 'filename' column ?

I find the best way to isolate this sort of problem is to build the query. Do a select *, a select cat, a select * where cat equals a known to be present value, etc.

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

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

Re: database

Alexinuk25-Nov-02 3:15

Alexinuk

25-Nov-02 3:15

Christian is right - '*' won't work as a wildcard but '%' will.

-Alex;)

WINVER puzzle

Antosha24-Nov-02 12:00

Antosha

24-Nov-02 12:00

On MSDN, in documenation for API structures, the following examples are common:

typedef struct _RASDIALPARAMS {
DWORD dwSize;
TCHAR szEntryName[RAS_MaxEntryName + 1];
TCHAR szPhoneNumber[RAS_MaxPhoneNumber + 1];
TCHAR szCallbackNumber[RAS_MaxCallbackNumber + 1];
TCHAR szUserName[UNLEN + 1];
TCHAR szPassword[PWLEN + 1];
TCHAR szDomain[DNLEN + 1] ;

#if (WINVER >= 0x401)
DWORD dwSubEntry;
DWORD dwCallbackId;
#endif
} RASDIALPARAMS;

Apparently (WINVER >= 0x401) refers to Windows NT 4.0 with enhancements and on this platform, the last 2 entries are required. However, Windows 98, whose version is 4.10 doesn't require them ...

Isn't 4.10 > 4.01? Or am I not understanding something?

Thanks

A reasonable man adapts himself to the world. An unreasonable one persists, trying to adapt the world to himself. That is why all the progress in the world depends on the unreasonable men.

help!! how to pause a simulation?

Anonymous24-Nov-02 9:45

Anonymous

24-Nov-02 9:45

The project is to simulate a Finited State Machine running with a specific input sequencr. Just highlight the path it goes through.

The problem is to set a Pause button to stop and restart it. How??? Do I has to use thread?? If yes how to
( My view class is base on CScrollView )

Thanks!!
Confused | :confused:

Drive Properties

georgiek5024-Nov-02 8:33

georgiek50

24-Nov-02 8:33

Does anyone know of a function/routine to tell me how many files are on a disk drive? Can't find anything in MSDN.

Re: Drive Properties

Dominik Reichl24-Nov-02 8:43

Dominik Reichl

24-Nov-02 8:43

I would use the FindFirstFile and FindNextFile.
You specify "*" as filter and then count the files. This way you also can count only specific files with specific extensions, or only count directories.

I don't know of any function which directly returns the number of files on a drive.

-Dominik

Re: Drive Properties

georgiek5024-Nov-02 19:40

georgiek50

24-Nov-02 19:40

Thanks for the help. I thought of also doing that but it would be pointless since I need this number to be set for a progress bar which is active during searching of the hard drive for files so it kind of defeats the purpose of doing that twice...any other ideas?

Re: Drive Properties

Dominik Reichl25-Nov-02 1:15

Dominik Reichl

25-Nov-02 1:15

Another idea:

First step: Get the used size on the disk (capacity minus free space). Use this function:

BOOL GetDiskFreeSpaceEx(<br />
  LPCTSTR lpDirectoryName,                 // pointer to the directory name<br />
  PULARGE_INTEGER lpFreeBytesAvailableToCaller, // receives the number of bytes on<br />
                                                // disk available to the caller<br />
  PULARGE_INTEGER lpTotalNumberOfBytes,    // receives the number of bytes on disk<br />
  PULARGE_INTEGER lpTotalNumberOfFreeBytes // receives the free bytes on disk<br />
);

Second step: Every time you process a file, subtract its size from the space.

Now you can compute the remaining bytes to process. Set this into relation and make a nice status bar.

Big Grin | :-D

-Dominik

Re: Drive Properties

georgiek5025-Nov-02 3:08

georgiek50

25-Nov-02 3:08

Thanks, that should do it...why didn't I think of that?!

Re: Drive Properties

georgiek5025-Nov-02 8:28

georgiek50

25-Nov-02 8:28

Sorry to bother again but I seem to be running into a problem with the GetDiskFreeSpaceEx function:

This is what i used:

GetDiskFreeSpaceEx("c:\\", &iFreeBytes, &iTotalBytes, &iTotalFreeBytes);

and these were my results:

iFreeBytes = 1711489024
iTotalBytes = 0
iTotalFreeBytes = 1697718272

Can't really figure out the problem...right clicking on drive c in explorer gives me freebytes as above (the first arguement) and for the drive capacity i have 5,992,685,568 bytes. Is there anything that I'm overlooking?

Re: Drive Properties

Mike Nordell25-Nov-02 12:08

Mike Nordell

25-Nov-02 12:08

When you print the results you can't just use %d specification since you're dealing with 64-bit values. Try a format string of "%I64d" and I'm sure you'll see quite a change. Smile | :)

[OpenGL] Problems with glGetString

Dominik Reichl24-Nov-02 8:23

Dominik Reichl

24-Nov-02 8:23

Hello,

I have a problem. I want use the glGetString function to get the vendor, version and extension strings. But this doesn't work.

My project does not need an OpenGL window. I don't need to draw anything. I just want the information by glGetString. You can think of a system information tool.

I LoadLibrary("OpenGL") the OpenGL library and then get the function using GetProcAddress(g_hOpenGL, "glGetString").

But glGetString always returns zero.

If I replace "OpenGL" with "GLU32", and replace "glGetString" with "gluGetString", so not using the main OpenGL library, but instead the utilities library, the functions work fine.

But the utilities library supports fewer information (just version and extensions).

How can I get the glGetString function work?
Do I have to initialize a window to make the glGetString function work? Or did I miss something?
Any idea?

Thank you!
-Dominik

Re: [OpenGL] Problems with glGetString

Mike Nordell25-Nov-02 12:11

Mike Nordell

25-Nov-02 12:11

Was "OpenGL" just a typo?
You should LoadLibrary("OpenGL32.dll") and nothing else.

Also, if you always need to do this you could equally well statically link with the opengl32.lib import library and get rid of the LoadLibrary and GetProcAddress calls.

Drive Properties

georgiek5024-Nov-02 5:44

georgiek50

24-Nov-02 5:44

Can anyone tell me a function/routine to find out the number of files on my hard drive...I didn't find anything in MSDN...Thanks is advance.

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