C / C++ / MFC Discussion Boards

Blake Miller13-Jan-06 7:03

13-Jan-06 7:03

MySample.H
extern CString strGlobal;

MySample.Cpp
#include "MySample.H"
// declare variable in ONLY one source file
CString strGlobal = "Initialization Value";

MyOtherSample.Cpp
#include "MySample.H"

Thanks: Unexpected end of file while looking for precompiled header directive

Sarvan AL12-Jan-06 0:36

Sarvan AL

12-Jan-06 0:36

Yes, I got it. As ....PJ Arends... said, I put #pragma once in all the .h files and #include "stdafx.h" as the first statement of all the .cpp files. Also I removed #include "PersonDlg.h" statement from the Person.h file. Now it works fine. But I have not changed the compiler option to "Not using percompiled header files..". Just I left it, as it is.

Thanks once again

Sarvan AL

Communication Between EXEs

rider cool11-Jan-06 21:48

rider cool

11-Jan-06 21:48

In the project that i am developing i need to communicate between two and more exe. how can i carry this out?

Re: Communication Between EXEs

PJ Arends11-Jan-06 21:58

PJ Arends

11-Jan-06 21:58

There are many ways, it really depends on what your needs are. You can used the clipboard, memory mapped files, pipes, mailslots, DDE, WM_COPYDATA, or windows sockets, etc.

See the articles listed at http://www.codeproject.com/threads/#Inter%2DProcess+Communication[^]

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Create Font to match Dialogue Box

LittleYellowBird11-Jan-06 21:17

LittleYellowBird

11-Jan-06 21:17

If I create butons and statics in my normal window they do not match those in my dialogue boxes (the font is different).

I can change the font in main window but I don't know what settings to use. Arial doesn't seem right, anyone know what they should be?

Thanks,

Ali

Re: Create Font to match Dialogue Box

Owner drawn11-Jan-06 21:51

Owner drawn

11-Jan-06 21:51

HFONT hFont = (HFONT)::GetStockObject(DEFAULT_GUI_FONT);

Despite the name, DEFAULT_GUI_FONT is not the default HWND and HDC font, but is TrueType, so consider using it.

Jesus Loves Rose | [Rose]

<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" style="background:#ffaaaa">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

Re: Create Font to match Dialogue Box

LittleYellowBird12-Jan-06 4:32

LittleYellowBird

12-Jan-06 4:32

Thanks for the advice, I will try it out. Smile | :)

Ali

Function as argument

kk.tvm11-Jan-06 20:35

kk.tvm

11-Jan-06 20:35

Hi All

How to pass a function name as argument of another function

eg

void Test()
{

}

main()
{
Do(Test)
}

by

KK

Re: Function as argument

Owner drawn11-Jan-06 20:44

Owner drawn

11-Jan-06 20:44

The signature of Do should be like this...

void Do(void (*)())
{
}

The return type can vary.

Jesus Loves Rose | [Rose]

<marquee direction="up" height="50" scrolldelay="1" step="1" scrollamount="1" style="background:#ffaaaa">
--Owner Drawn Rose | [Rose]

--Nothing special
--Defeat is temporary but surrender is permanent
--Never say quits
--Jesus is Lord Rose | [Rose]

Re: Function as argument

Zdeslav Vojkovic11-Jan-06 20:47

Zdeslav Vojkovic

11-Jan-06 20:47

void Test() { printf("test\n"); }<br />
<br />
void Do(void fn()){ fn(); }<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
	Do(Test);<br />
	return 0;<br />
}

Re: Function as argument

Cedric Moonen11-Jan-06 20:48

Cedric Moonen

11-Jan-06 20:48

You don't pass a function name as argument as another function but rather a pointer to a function:

First, you have to describe what is the 'type' of the function, for example:
typedef void (MyFunc*) (int,int);

This is a typedef that says that MyFunc is a type definition of a function returning nothing (the first void before (MyFunc*) ) and that takes two integer arguments (the argument list is specified after (MyFunc*) ).

Then, you can use MyFunc as a standard argument to a function:

void Do(MyFunc MyFuncThatWillBePassed)<br />
{<br />
}

This explain that the Do function will receive a pointer to a function of the type MyFunc as argument.

Inside your Do function, when you want to call your function, simply do that:

void Do(MyFunc MyFuncThatWillBePassed)<br />
{<br />
    int a=0,b=0;<br />
    MyFuncThatWillBePassed(a,b);<br />
}

Warning: you have to respect of course the type of the function and so you NEED to pass two integers (in our case) to your function otherwise you will have compile errors.

Hope this helps

Re: Function as argument

Zdeslav Vojkovic11-Jan-06 21:06

Zdeslav Vojkovic

11-Jan-06 21:06

it should be
typedef void (*MyFunc) (int,int);

Re: Function as argument

Cedric Moonen11-Jan-06 21:13

Cedric Moonen

11-Jan-06 21:13

Ooops... Sorry typo mistake

Re: Function as argument

kk.tvm11-Jan-06 20:56

kk.tvm

11-Jan-06 20:56

Hi
Thanx for all answers

by

KK

Sticky Windows?

S Douglas11-Jan-06 20:25

S Douglas

11-Jan-06 20:25

My Google skills are failing me this evening; does anyone have any examples or pointers for creating Sticky windows? Basically what I want is to create dialogs that stick to each other like Win Amp’s play list editor and its main dialog.

Any help is appreciated.

ZeePain! wrote:
This seems like one of those programs that started small, grew incrementally, building internal pressure, and finally barfed all over its source code sneakers. Or something.

thedailywtf.com[^]

Re: Sticky Windows?

Rage11-Jan-06 22:34

Rage

11-Jan-06 22:34

Tried a search on CP with "docking windows" ?

~RaGE();

Re: Sticky Windows?

S Douglas11-Jan-06 22:43

S Douglas

11-Jan-06 22:43

Rage wrote:
"docking windows"

Funny about a minute ago it dawned on me to change my search params. Low and behold there is all kinds of info. Gee Blush | :O

Thank you for the reply.

ZeePain! wrote:
This seems like one of those programs that started small, grew incrementally, building internal pressure, and finally barfed all over its source code sneakers. Or something.

thedailywtf.com[^]

DBF file usage

<color>Aljechin 11-Jan-06 19:55

<color>Aljechin

11-Jan-06 19:55

I have a .DBF file. Is it possible to do some database operation on this file using ODBC on some machine where SQL Server is not installed? If so can you show me a small code sample? (The application that i use is written in Visual C++ 6.0)

Thanks
Aljechin Alexander

Rose | [Rose]

__yb13-Jan-06 12:15

__yb

13-Jan-06 12:15

ODBC is just an interface - it has no engine for SQL Server.

Can a BHO do this?

Chintoo72311-Jan-06 19:18

Chintoo723

11-Jan-06 19:18

Google Web accelerator highlights prefetched links with a double-underline, but I dont see the web page being modified. I know this application is a BHO, so can someone tell me how can a BHO modify the look and feel of the web page?

PS: What is the difference between BHO and a add-on?

thanks!

Re: Can a BHO do this?

__yb13-Jan-06 12:18

__yb

13-Jan-06 12:18

A BHO can basically do whatever it wants :p
A BHO sits in the browser app, thats outside the page, and add-ons are embedded in the page. For that reason BHOs has a wider view of things.

try/catch - getting line number

Chintoo72311-Jan-06 19:09

Chintoo723

11-Jan-06 19:09

I have a try/catch block that is throwing an exception. What are the different things I can find out about the exception? line number, exception type, etc?

thanks!

Re: try/catch - getting line number

__yb13-Jan-06 12:22

__yb

13-Jan-06 12:22

simply put - what u throw is what u get.
try/catch are not defined to give info like line numbers, only what was thrown.
to get more info u'll have to use SEH, but then u lose unwind semantics...

Re: try/catch - getting line number

Shraddhan25-Jan-06 13:09

Shraddhan

25-Jan-06 13:09

What I do is to buld a string containing the value of __LINE__ and pass this to a global ThrowError function which packages this into an object which throw can throw.

For example:

class CMyError : public CException {
public:
const char * Message;
};

and somewhere in the code:

static CString s;
s.Format("File %s, line %d\nOverflow in addition", THIS_FILE, __LINE__);
ThrowError(s);

where ThrowError puts its argument into Message in an instance of CMyError and throws the CMyError. So basically I can send any information I want to via a throw.

Shraddhan

Re: try/catch - getting line number

Chintoo72325-Jan-06 15:18

Chintoo723

25-Jan-06 15:18

1. Thanks for the suggestion, but I think that is not really what I want. If I know where to throw the error I know where the error is really happening. What I was looking for is line number for unexpected errors.

2. To __yb: I learnt that you can do all with C++ try/catch that you do with SEH through _set_se_translator. So if you can use SEH to get the instruction pointer that caused the error, you can obtain the same using C++ try/catch too.

3. For a suggestion to my own query, I can think of a _dirty_ way to obtain the line number in a try/catch or even with SEH. Before compiling the code write a script that will insert this statement after every line of code:
g_lineno = __LINE__;
and then in your exception filter, you can print this global variable g_lineno.

Now what I want to know from you guys is, whether this is going to be a performance hit if I implement it in production. I think _no_big_deal_ but what is your opinion?

thanks!

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