C / C++ / MFC Discussion Boards

cp987628-Mar-07 18:10

28-Mar-07 18:10

Does UpdateData() return TRUE?

Have you set a breakpoint in your DoDataExchange() function to check that the string is being set from the edit control?

Have you set a breakpoint before the message box is called to see what the value of the string is?

You should try some basic debugging - it's the best teacher Smile | :)

Peter

"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

Re: About AfxMessageBox

bios808628-Mar-07 20:32

bios8086

28-Mar-07 20:32

"You should try some basic debugging - it's the best teacher"
that's right!!!!;)

Re: About AfxMessageBox

Paresh Chitte28-Mar-07 18:20

Paresh Chitte

28-Mar-07 18:20

Have you entered in the message in message map BEGIN_MESSAGE_MAP END_MESSAGE_MAP

Regards,

Paresh.

Re: About AfxMessageBox [modified]

zon_cpp28-Mar-07 19:27

zon_cpp

28-Mar-07 19:27

call UpdateData(FALSE) instead UpdateData(TRUE)

void CHelloDialogDlg::OnBnClickedOk()<br />
{<br />
UpdateData(FALSE);<br />
AfxMessageBox(m_strMessageText);<br />
}

-- modified at 1:35 Thursday 29th March, 2007

Zo.Naderi-Iran

Re: About AfxMessageBox

Parthi_Appu28-Mar-07 19:40

Parthi_Appu

28-Mar-07 19:40

zon_cpp wrote:
call UpdateData(FALSE) instead UpdateData(TRUE)

To retrieve data from the control we have to pass TRUE, so UpdateData(TRUE) is correct.

Do your Duty and Don't expect the Result
Rate this Post, if I helped You

Re: About AfxMessageBox

zon_cpp28-Mar-07 19:53

zon_cpp

28-Mar-07 19:53

Yes, i mistook. WTF | :WTF:

excuse me

Zo.Naderi-Iran

Re: About AfxMessageBox

Parthi_Appu28-Mar-07 20:35

Parthi_Appu

28-Mar-07 20:35

No prob, every body do mistake Smile | :)

Do your Duty and Don't expect the Result
Rate this Post, if I helped You

help! problem in gdi library?

ghunzel0628-Mar-07 16:33

ghunzel06

28-Mar-07 16:33

Hi! I have a button with a bitmap on it. In Win98/2000, when I try to drag the button, the icon disappears and button becomes blank. It works fine in WinXP.

Any ideas why? Thanks!

how to download fonts to laser printer

Stober28-Mar-07 11:40

Stober

28-Mar-07 11:40

I need to print barcodes using VC++ 2005 Pro on XP network laser printer. I have the barcode on the PC but need to download them to the printer. My program already calls win32 api function CreateFontIndirect(), but the barcode doesn't print, so I assume the font needs to be downloaded.

Thanks

Re: how to download fonts to laser printer

Stober28-Mar-07 23:00

Stober

28-Mar-07 23:00

you mean to tell me that nobody here knows how to do this OMG | :OMG:

I can't believe that nobody here has every had to download fonts to a printer. Unbelieveable. Confused | :confused:

Re: how to download fonts to laser printer

Mark Salsbery29-Mar-07 6:48

Mark Salsbery

29-Mar-07 6:48

nah. We've gone paperless - nobody prints anymore Poke tongue | ;-P

You've created the font object but have you selected it into the printer DC before you render
what you're going to print?

Mark

"If you can dodge a wrench, you can dodge a ball."

How to get the Error string of WSAGetLastError() Error code?

TurboNext28-Mar-07 6:43

TurboNext

28-Mar-07 6:43

Hi All,

WSAGetLastError returns a Error number, is there a way to get the actual error string instead of just the Error No. Eg 10054(Connection reset by peer).

If my program WSAGetLastError() returns 10054, I need to somehow get "Connection reset by peer" from the error code. Please let me know what function I need to use. Any help greatly appreciated.

Thanks
Turbo.

Re: How to get the Error string of WSAGetLastError() Error code?

JudyL_MD28-Mar-07 6:45

JudyL_MD

28-Mar-07 6:45

FormatMessage

Re: How to get the Error string of WSAGetLastError() Error code?

James R. Twine28-Mar-07 6:49

James R. Twine

28-Mar-07 6:49

   Note that for non-standard-Win32 error messages, you may need to tell FormatMessage(...) where to locate the message table for a particular error code.

   [I do not remember if the Winsock errors are (or were) considered non-standard...]

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Re: How to get the Error string of WSAGetLastError() Error code?

David Crow28-Mar-07 6:59

David Crow

28-Mar-07 6:59

TurboNext wrote:
...is there a way to get the actual error string instead of just the Error No. Eg 10054(Connection reset by peer).

Error Lookup tool.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: How to get the Error string of WSAGetLastError() Error code?

TurboNext28-Mar-07 7:04

TurboNext

28-Mar-07 7:04

Thank You Guys.

compile error: storage size of 'var' isn't known

George_George28-Mar-07 5:46

George_George

28-Mar-07 5:46

Hello everyone,

I get a strange compile error when compile such simple program. Any ideas?

foo.c: In function `main':
foo.c:5: error: storage size of 'var' isn't known

foo.c

<br />
#include "goo.h"<br />
<br />
int main (int argc, char** argv)<br />
{<br />
    t_st var;<br />
    var.member = 100;<br />
    return 0;<br />
}<br />

goo.c

<br />
struct st {<br />
<br />
int member;<br />
<br />
};<br />
<br />

goo.h

<br />
typedef struct st t_st;<br />

thanks in advance,
George

Re: compile error: storage size of 'var' isn't known

David Crow28-Mar-07 5:59

David Crow

28-Mar-07 5:59

My guess is that the compiler does not yet know what struct st is.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: compile error: storage size of 'var' isn't known

Nemanja Trifunovic28-Mar-07 6:28

Nemanja Trifunovic

28-Mar-07 6:28

Move the declaration of st from goo.c to goo.h (before the typedef)

Programming Blog
utf8-cpp

Re: compile error: storage size of 'var' isn't known

George_George2-Apr-07 20:45

George_George

2-Apr-07 20:45

Nemanja Trifunovic wrote:
Move the declaration of st from goo.c to goo.h (before the typedef)

I think if I define a struct in .c file, I can only use the struct in the same .c file, and have no walk-around to utilize the struct in other .c file.

If I want to use the struct in multiple .c files, I have to define it in .h file?

regards,
George

Re: compile error: storage size of 'var' isn't known

prasad_som28-Mar-07 6:33

prasad_som

28-Mar-07 6:33

Why not just follow standard way to declare structures ?
In goo.h declare it like,

typedef struct st {

int member;

}t_st;

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: compile error: storage size of 'var' isn't known

Mark Salsbery28-Mar-07 7:15

Mark Salsbery

28-Mar-07 7:15

What makes "typedef struct {} name" better than just "struct name"?

Last I heard (a long time ago), using typedef for a struct like this is redundant.
I can see that it's cool to use one line to define the type and a variable, but using struct
like

struct name
{
};

defines a type so typedef is redundant (unless you want to define an alias).

I would say that this is the popular way, not the standard way.

Thanks,
Mark

"If you can dodge a wrench, you can dodge a ball."

Re: compile error: storage size of 'var' isn't known

David Crow28-Mar-07 7:47

David Crow

28-Mar-07 7:47

Mark Salsbery wrote:
What makes "typedef struct {} name" better than just "struct name"?

I believe typedef is required in C, and is optional in C++.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: compile error: storage size of 'var' isn't known

Mark Salsbery28-Mar-07 8:05

Mark Salsbery

28-Mar-07 8:05

Ahh cool. Thanks!

Mark

"If you can dodge a wrench, you can dodge a ball."

Re: compile error: storage size of 'var' isn't known [modified]

toxcct28-Mar-07 8:20

toxcct

28-Mar-07 8:20

DavidCrow wrote:
I believe typedef is required in C, and is optional in C++

actually no. typedef is not required in C, but struct is.

that is, when you declare a structure and you want to declare a variable of that type, you must use the struct keyword :

<font color=blue>struct</font> TMyStruct {
    <font color=green>// Whatever...</font>
};
 
 
<font color=blue>struct</font> TMyStruct s1;    <font color=green>//OK in both C and C++</font>
TMyStruct        s2;    <font color=green>//OK in C++, but won't compile in C</font>

so, to get rid of that heavy notation, programmers used to typedef the structs/unions declarations :

<font color=blue>typedef struct</font> TMyStruct {
    <font color=green>// Whatever...</font>
} TMyStruct;
 
 
<font color=blue>struct</font> TMyStruct s1;    <font color=green>//still OK in both C and C++</font>
TMyStruct        s2;     <font color=green>//now OK in both C and C++</font>

[Edit (for Mark)]
Note that such an expression :

typedef struct Name {} name;

doesn't declare a variable of type name, but defines the synonym name for the type struct Name
to understand it, we can split it :

       type definition
               |
        /------------\
<code>typedef struct Name {} name;</code>
   \                    /
    \------------------/
             |
     typedef declaration

it's exactly like doing :

struct Name {};
typedef struct Name name;

Notice that a variable cannot be declared in a typedef instruction
[/edit]

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