Linking OBJ files - C / C++ / MFC Discussion Boards

xxhimanshu13-Apr-03 20:28

13-Apr-03 20:28

hi,
check for the old CLSID i guess you have not changed it everywhere..and other things which you ahve changed..also add the forceremove thing....and check hope it works fine for you..
cheers

Himanshu

subclass a button fail :(

_skidrow_vn_13-Apr-03 9:52

_skidrow_vn_

13-Apr-03 9:52

I wrote a function to subclass a normal button (add bitmap, change backcolor...)
So when I push this button slowly >> it works okay
but when I push it quickly >> its interface is disorderly
I process wrong a message from button's window proc Confused | :confused:

help.......thanks
MyProject

Skid Row

Re: subclass a button fail :(

PJ Arends13-Apr-03 10:14

PJ Arends

13-Apr-03 10:14

You have to handle the WM_LBUTTONDBLCLK message

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Re: subclass a button fail :(

_skidrow_vn_13-Apr-03 10:38

_skidrow_vn_

13-Apr-03 10:38

Thank you for that
thank you again Rose | [Rose]

CString and std::string

tomc13-Apr-03 8:50

tomc

13-Apr-03 8:50

I have a function that takes a std::string
void SomeFunc(string str);
I want to use std::string (instead of CString) because this function is complied for both Unix and Windows

Then in a MFC dialog program, I set a edit control to a CString. What is the best way to convert CString to std::string? Can I associate std::string insteaf of CString with an edit control?

Thanks in advance.

Re: CString and std::string

C^hris L^osinger13-Apr-03 9:18

C^hris L^osinger

13-Apr-03 9:18

tomc wrote:
What is the best way to convert CString to std::string?

myStdString = myCString;

tomc wrote:
Can I associate std::string insteaf of CString with an edit control?

you can write a new DDX function to grab the text from the edit control into a std::string. look in dlgdata.cpp (part of the MFC source) and see how the standard DDX function work. it should be pretty easy to write one that takes a std::string.

-c

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Re: CString and std::string

Michael Dunn13-Apr-03 16:02

Michael Dunn

13-Apr-03 16:02

tomc wrote:
What is the best way to convert CString to std::string?

See The Complete Guide to C++ Strings, Part II - String Wrapper Classes[^]

--Mike--
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Linking OBJ files

#realJSOP13-Apr-03 7:40

#realJSOP

13-Apr-03 7:40

Using VC6:

I'm trying to link an OBJ file into my MFC C++ application. If I include the obj file in the linker input settings, I get duplicate definitions for functions in libcmtd and nafxcwd. If I set the linker input options to ignore the nafxcwd library results in all kinds of unresolved external errors.

If I do this...

#pragma comment( lib, "papytelemapp.obj")

...I get this

warning LNK4003: invalid library format; library ignored

I do NOT have the source code for the obj file and MSDN doesn't say ANYTHING about this that is more descriptive than what the compiler spits out. I am fairly certain that the obj file is compiled with VC++ 6.0, and the struct byte alignment is set to 1 in the OBJ file (my program is set to 8).

Things I've tried:

1) Changing the linker output to "both" COFF and Microsoft debug formats

2) Changing my program's struct alignment to 1 byte

Anyone got a hint for me?

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Re: Linking OBJ files

C^hris L^osinger13-Apr-03 9:20

C^hris L^osinger

13-Apr-03 9:20

John Simmons / outlaw programmer wrote:
If I include the obj file in the linker input settings, I get duplicate definitions for functions in libcmtd and nafxcwd.

my guess is that your project is using different c-runtime settings than the .obj, so the .obj is looking for things in one runtime set but your app is setup to use another.

-c

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Re: Linking OBJ files

#realJSOP14-Apr-03 5:04

#realJSOP

14-Apr-03 5:04

One of the guys here at work suggested that I add the OBJ file to the project using the Project|Add To Project|Files, and seeing if that doesn't fix it.

I'll be giving it a shot when I get home from work.

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Please review the Legal Disclaimer in my bio.

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Re: Linking OBJ files

#realJSOP14-Apr-03 11:33

#realJSOP

14-Apr-03 11:33

And that indeed solved the problem. I get a warning about libcmt, but so what...

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Get Listbox from Combobox

peterchen13-Apr-03 5:20

peterchen

13-Apr-03 5:20

Can I get a HWND to the listbox part of a combobox? 7 ComboBoxEx?

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screen saver project error

karanba13-Apr-03 4:46

karanba

13-Apr-03 4:46

Hi All
I am getting the below errors and could not found any reason. I a mtrying to do a simple screen saver with (unmanaged) c++ by using scrnsave.lib

ScreenSaver error LNK2019: unresolved external symbol _DefScreenSaverProc@16 referenced in function _ScreenSaverProc@16
ScreenSaver error LNK2019: unresolved external symbol _WinMain@16 referenced in function _WinMainCRTStartup
ScreenSaver fatal error LNK1120: 2 unresolved externals

What could be the reason

karanba

keep-alive mechanism

Dudi Avramov13-Apr-03 3:53

Dudi Avramov

13-Apr-03 3:53

I'd like to know what is the benefit that i get when i enable the socket keep-alive mechanism?
I know that it is transpanert to the application layer.
Now, suppose i use MFC socket whereupon i get OnClose event in case the client or the server is down.
Therefore, i don't undestand when shall i enable the keep-alive mechanism and what is the benefit??

Thanks,
Dudi

Re: keep-alive mechanism

Brian Shifrin13-Apr-03 17:37

Brian Shifrin

13-Apr-03 17:37

Almost never, keep alive default notify ~2 hours....

Re: keep-alive mechanism

Dudi Avramov13-Apr-03 19:47

Dudi Avramov

13-Apr-03 19:47

Yes i know that. However, what is the benefit when keep-alive is enabled?

OnQueryEndSession - how to delay its imlementation with some seconds?

julych13-Apr-03 3:50

julych

13-Apr-03 3:50

What shall I do in order to slow down the implementation of OnEndSession() (or OnQueryEndSession) - I mean when the program or the system sends WM_QUERYENDSESSION (or WM_ENDSESSION) a dialog appears - I need 10-15 seconds for the user to read the message on this dialog and then continue with the implementation of OnQueryEndSession() and OnEndSession() functions.
I tried with a timer but something went wrong. Is there another way?

Question about friend function.

George213-Apr-03 3:49

George2

13-Apr-03 3:49

Hi, everyone!

I have often noticed that someone declares a friend
fucntion inside a class (in the .h file of the class)
and give the definition of the function in the .cpp file
of the same class. I want to know whether this
method is correct? Does it have some weak points? Where should
correct place which we give the definition (Note: not the declaration)
of the function?

Another question is, if I define the function like below, what is the
scope of the function? (i.e. where can compiler find the function?)

Here is the sample codes I noticed:

in A.h
--------

class A {

friend int functionA();
void memberfunction();
}
--------

A.cpp
--------
A::memberfunction()
{
//implemention
}

int functionA()
{
//implemention
}

--------

Thanks in advance,
George

MessageBox variation

J.B.12-Apr-03 22:23

J.B.

12-Apr-03 22:23

Hello guys,
I am looking for a function that is similiar to MessageBox function, however, would have ability to include formatted variable in the pop-up windows box.

Best way to illustrate, is something in combination of printf and MessageBox

int number = 3;
printf("Number is : %d", number);

so, might mean doing that in forms of MessageBox
MessageBox("Number is : %d", number);

Is there funtion MFC that could server that purpose?

Thanks in advance for any help.

Re: MessageBox variation

Brian Shifrin13-Apr-03 0:29

Brian Shifrin

13-Apr-03 0:29

CString myMessage;
myMessage.Format("Number is : %d", number);
MessageBox(myMessage, ..., MB_OK);

Brian

Re: MessageBox variation

Neville Franks13-Apr-03 0:46

Neville Franks

13-Apr-03 0:46

There isn't an MFC function for this. I use code like the following in ED (see sig) for it's "Do not ask again" message boxs.

MsgBox( TCHAR* pStr, ... )
{
    va_list marker;
    va_start( marker, pStr );
    const int nMaxMsgSize = 10 * 1024;   // we don't know how to calc required size, so pick something large enough.
    TCHAR substmsg[ nMaxMsgSize+1 ] = {0};
    _vsnprintf( substmsg, nMaxMsgSize, pStr, marker );

    MessageBox( hWnd, substmsg, Caption, uType );

    va_end( marker );
}

You need to fill in the missing bits like hWnd etc,

Hope that helps.

Neville Franks, Author of ED for Windows. www.getsoft.com
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Re: MessageBox variation

Jean-Marc Molina13-Apr-03 1:49

Jean-Marc Molina

13-Apr-03 1:49

Hello,

The solution is to first format your string, then display the message box. The best way is probably to use a varlist and to implement your own function. Here is my own:

int AfxMessageBoxFormat (LPCTSTR lpszFormat, ...)<br />
{<br />
	// Build message from parameters<br />
<br />
CString s;<br />
<br />
va_list args;<br />
va_start (args, lpszFormat);<br />
<br />
	s.FormatV (lpszFormat, args);<br />
<br />
	va_end (args);<br />
<br />
	// Message box<br />
<br />
	return AfxMessageBox (s);<br />
}

Hope that helps,
JM

Web: http://goa.ifrance.com

Re: MessageBox variation

J. Dunlap13-Apr-03 7:36

J. Dunlap

13-Apr-03 7:36

I don't think there is, but I'm working on just such a thing in C#.

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Question about overloading operator time_t.

George212-Apr-03 20:34

George2

12-Apr-03 20:34

Hi, everyone!

Suppose I have a customer class defines a customer
time presentation structure. It has three int member
variables: year, month and day.

I have noticed someone who overloading time_t operator.
But I do not know how to do it, one of which can be reached
at,

--------
http://www.p2ptoolkit.com/classl2t_1_1base_1_1Date.html#a7
--------

Can anyone tell me how to overload time_t operator? Another
question is I do not know how to use a overloaded time_t
operator. Smile | :)

Here is the code I write myself. I do not know whether it is
correct. I still do not know how to use a overloaded time_t
operator of my class. I just write the operator overload function
from my thought that maybe it should be like this. Smile | :)

Can anyone help?

--------
Class MyTime {

int year;
int month;
int day;

MyTime::operator time_t() const
{
struct tm wn = {0};
wn.tm_mday = day;
wn.tm_mon = month;
wn.tm_year = year;
time_t output = mktime(&wn);
return output;
}
}
--------

Thanks in advance,

Re: Question about overloading operator time_t.

markkuk13-Apr-03 0:15

markkuk

13-Apr-03 0:15

time_t isn't an operator, so you can't overload it. It's a standard C typedef for representing time. I guess what you really want is a type conversion operator between MyTime and time_t? That overloads the operator (). Your code is correct for overloading the () operator, but don't use MyTime:: prefix when the function definition is inside the class, and the variable output is redundant.

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