C / C++ / MFC

31-Jan-02 3:59

Hello..
I want to know something! In Visual C++ also can use C code, but can or not C code in same project call C++ function??
like this, my C code is in what.c and I want to call function in loginDlg.C++, the function name is CLoginDLg...
i try do this in file what.c
CLoginDlg dlg;
dlg.DoModal();

but this error appear when i compile it
error C2065: 'CLoginDlg' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'dlg'
error C2065: 'dlg' : undeclared identifier
error C2224: left of '.DoModal' must have struct/union type
anybody can help me.. or i do wrong!!??

Simon Walton31-Jan-02 4:43

Simon Walton

31-Jan-02 4:43

If you post some code perhaps we can help you. Smile | :)

Simon
C++: Only friends can see your private parts.
Sonork ID 100.10024

aleyah31-Jan-02 4:59

31-Jan-02 4:59

where to i post my code in this forum??

Alvaro Mendez31-Jan-02 5:05

Alvaro Mendez

31-Jan-02 5:05

You can't call C++ code from C the way you're trying it. CLoginDlg is a class which C does not recognize.

What you can do is wrap that code inside a global "C"-style function inside your C++ file:

extern "C" void OpenLoginDlg()
{
   CLoginDlg dlg;
   dlg.DoModal();
}

Then you can call OpenLoginDlg in your C code.

Regards,
Alvaro

aleyah31-Jan-02 5:20

31-Jan-02 5:20

never mind for login dialog...
but i want you to solve this problem... because this i my main problem........

this is my C code
case IDC_OK:
database db; //this i call function from c++ file
db.Open(CRecordset::dynaset,"password);
while(!db.IsEOF())
{
if(db.m_userID == IDC_USER_NAME)
{
if(db.m_password == IDC_PASSWORD)
{
ShellExecute (NULL, "open", "d:\\games\\Same.exe",NULL,NULL,SW_SHOWNA);
exit(0);
}
else
{
AfxMessageBox("Incorrect password!");
m_word="";
UpdateData(false);
return;
}
}
loginConn.MoveNext();
}

but this error appear
error C2065: 'database' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'db'
error C2065: 'db' : undeclared identifier
error C2224: left of '.Open' must have struct/union typeerror C2065: 'CRecordset' : undeclared identifier
error C2143: syntax error : missing ')' before ':'

aleyah31-Jan-02 5:38

31-Jan-02 5:38

anyone can help me!!!!

Joaquín M López Muñoz31-Jan-02 6:03

31-Jan-02 6:03

Do not panic Smile | :)

Try this:

close all open files in your Visual Studio, delete your .c files from the project, go to the Windows Explorer, locate those files, change the extension to .cpp and add them back to the project. Now, hopefully, your formerly C modules are C++.
whenever you get some "undeclared identifier" compiler error, try to locate the .h header file for the class you're trying to use and insert the corresponding #include.

With a little luck, this will help you advance a little further.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Not Active31-Jan-02 10:56

Not Active

31-Jan-02 10:56

Sounds like the best help for you would be to go back to school or re-read the books.

aleyah31-Jan-02 6:02

31-Jan-02 6:02

i do as you write...
but when i compile... it have this warning
want.c(1957) : warning C4013: 'OpenLoginDlg' undefined; assuming extern returning int

and i try to build exe... it appear Microsoft Visual C++ Debug Library... so what must i do now??

menu bar

aleyah31-Jan-02 3:46

31-Jan-02 3:46

hi all;

I am writting an MFC app using the Doc/View and MDI. My problem is my additional menu bar was grayed and can not click but i dont set it as grayed. And the original menu bar was appear and can click on it. So how to solve this problem.

567890123431-Jan-02 4:03

5678901234

31-Jan-02 4:03

When you add new menu item to SDI/MDI MFC application it is disabled in run-time untill you write message handler for this item.

Joaquín M López Muñoz31-Jan-02 4:01

31-Jan-02 4:01

Maybe it has to do with command update handlers. Have you ON_COMMAND_UPDATE_UI handlers for the new commands in the additional menu bar? (I'm asuming you already have ON_COMMAND handlers for them)

Also you might find interesting to have a look at the flag

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcmfc98/html/_mfc_cframewnd.3a3a.m_bautomenuenable.asp">CFrameWnd::m_bAutoMenuEnable</a>

, which gives you control over this kind of things.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

aleyah31-Jan-02 4:56

31-Jan-02 4:56

thanks...
it's work, but can you tell me how to appear the dialog box after we click the menu bar?????

Joaquín M López Muñoz31-Jan-02 5:03

31-Jan-02 5:03

If I'm understanding your question, you should write something like this on your command handler:

CYourDialog dlg;
dlg.DoModal();

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

aleyah31-Jan-02 5:09

31-Jan-02 5:09

i do this

void CMainFrame::OnLogin()
{
login dlg;
dlg.DoModal();
}

but this error appear!!
error C2065: 'login' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'dlg'
error C2065: 'dlg' : undeclared identifier
error C2228: left of '.DoModal' must have class/struct/union type

Joaquín M López Muñoz31-Jan-02 5:19

31-Jan-02 5:19

mmmh... What is that login? It is a CDialog class, right? Then in your project you'll see a .cpp and a .h (possibly login.h) files associated with the class. Include this line at the beggining of the file where the error is:

#include "login.h" // or whatever the header file for the class is named

You know, this is pretty basic C/C++ stuff. Maybe you should spend some time reading some C/C++ primer to get the fundamentals learnt. Do a search on Internet, there must be plenty of tutorials.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

aleyah31-Jan-02 5:23

Joaquín M López Muñoz LOOK HERE! (or anyone)

31-Jan-02 5:23

thanks...
can you help me to solve my above problem... (c and visual c++)

Rickard Andersson²⁰31-Jan-02 1:17

Rickard Andersson²⁰

31-Jan-02 1:17

I wrote:
I have download the remote control code here from CP and can't get it to work (any more)!!

The problem is that it can't connect to the server over the LAN!!
Another Winsock app works just fine and it uses CAsyncSocket class...

I know this should be impossible for you to say whats wrong without code example. But you perhaps know something that I don't know...

Joaquín M López Muñoz wrote:
The error is descriptive enough... seems like the server is not running properly. Try issuing a telnet your_server_ip port where port is the port number used by the app to determine whether the server is running or not.

Yes, I've done that and the Telnet client came up and was connected to the server... so... is my LAN not working properly?

Do you remember this message ?

------------------------------
©0d3 ©®4©k3® - That's me! Smile | :)

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Re: Joaquín M López Muñoz LOOK HERE! (or anyone)

Joaquín M López Muñoz31-Jan-02 2:41

Re: Joaquín M López Muñoz LOOK HERE! (or anyone)

31-Jan-02 2:41

You did a telnet aaa.bbb.ccc.ddd 5150? Please note the 5150, which is the TCP port used by the app (I peeked inside the code). A normal telnet is no useful test.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Rickard Andersson²⁰31-Jan-02 3:18

Rickard Andersson²⁰

31-Jan-02 3:18

Wll, I've used 5729 instead of 5150 because I've read in the Winsock FAQ that 5150 was a reserved port number so I change but now when I changed back it works... weird...

Well well...

------------------------------
©0d3 ©®4©k3® - That's me! Smile | :)

------------------------------

Re: Joaquín M López Muñoz LOOK HERE! (or anyone)

Joaquín M López Muñoz31-Jan-02 3:22