unresolved external symbol -- help please - C / C++ / MFC Discussion Boards

Weiye Chen19-Jun-06 23:37

19-Jun-06 23:37

I created a test project to try out your problem here but i dont have that issue like you described. Does your control looks like losing focus and getting it back again in a split sec?

Re: CComboBoxEx click bug

jackssf19-Jun-06 23:58

jackssf

19-Jun-06 23:58

Thank you for taking time to test this.
This happens in VC6 SP6,WinXP and Win2k

I have found the same problem in

www.codeguru.com/forum/archive/index.php/t-354179.html

but there is no answer

Thank you in advance

key press problem

aaaan19-Jun-06 21:48

aaaan

19-Jun-06 21:48

hi My application is dialog based.
at the time of running,if u press Esc key
then it is closed. how can i prevent this.
can any one help me?

thanx

rai

Re: key press problem

Laxman Auti19-Jun-06 22:00

Laxman Auti

19-Jun-06 22:00

aaaan wrote:
My application is dialog based.
at the time of running,if u press Esc key
then it is closed. how can i prevent this.
can any one help me?

See the following code

BOOL CmyApp::PreTranslateMessage(MSG* pMsg) 
{
	// TODO: Add your specialized code here and/or call the base class
	if(pMsg->message == WM_KEYDOWN && (VK_ESCAPE == pMsg->wParam || VK_RETURN == pMsg->wParam))
		//if(AfxMessageBox("Do you want to exit",MB_YESNO)==IDNO)
	pMsg->wParam=NULL;

	return CWinApp::PreTranslateMessage(pMsg);
}

Knock out 't' from can't,
You can if you think you can
Cool | :cool:

Re: key press problem

Cedric Moonen19-Jun-06 22:01

Cedric Moonen

19-Jun-06 22:01

See the FAQ[^]

Cédric Moonen
Software developer

Charting control

Re: key press problem

Hamid_RT19-Jun-06 22:05

Hamid_RT

19-Jun-06 22:05

See My dialog closes when the user hits the Enter/Return or Esc key. Why ?[^]

whitesky

Re: key press problem

Eytukan19-Jun-06 23:23

Eytukan

19-Jun-06 23:23

http://www.codeproject.com/script/comments/forums.asp?msg=1539876&forumid=1647#xx1539876xx[^]

<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[ Jig | [Dance]

]--

[My Current Status]

unresolved external symbol -- help please

hendry19719-Jun-06 21:32

hendry197

19-Jun-06 21:32

Hi...

i got problem when compiling & linking my app in visualC++. I got the error msg like this:

------------------- the error msg -------------------
Linking...
Cobalagiah.obj : error LNK2001: unresolved external symbol "public: static int __cdecl ReadBitstreamFile::create(class ReadBitstreamFile * &)" (?create@ReadBitstreamFile@@SAHAAPAV1@@Z)
Debug/Cobalagiah.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

Cobalagiah.exe - 2 error(s), 0 warning(s)

------------------- end of the error msg -------------------

the situation is as follow. there is one workspace with many projects in it. I have to make my own project in the same workspace and utilize some classes from other projects (within the same workspace).
So i set the directory paths to include the other header files (Tools - Options - Directories tab). by doing that i can put the code #include "ReadBitstreamFile.h" and compiling it was ok.
but then when I put this code in the main function (just for testing)

----------------- my testing code -----------------
int main(int argc, char* argv[])
{
ReadBitstreamFile *pcReadBitstreamFile;
ReadBitstreamFile::create( pcReadBitstreamFile );
printf("Hello World!\n");
return 0;
}
----------------- end of my testing code -----------------

that error occurs. note that the "create" function is a static function. it is defined in other class in other project.

anybody can help, please?

regards,
Hendry
email at: hendry197-at-msn-dot-com

Re: unresolved external symbol -- help please

Cedric Moonen19-Jun-06 21:40

Cedric Moonen

19-Jun-06 21:40

You have also to add the cpp file in which ReadBitstreamFile is defined to your project. Do that simply by tight-clicking on the file views on the directory with the source files of your project. Then select add file (or something similar, depends of the IDE you are using).

Cédric Moonen
Software developer

Charting control

Re: unresolved external symbol -- help please

Weiye Chen19-Jun-06 21:47

Weiye Chen

19-Jun-06 21:47

hendry197 wrote:
that error occurs. note that the "create" function is a static function. it is defined in other class in other project.

Is this other project a library? If so, you need to include the header and add that lib to your project.

Re: unresolved external symbol -- help please

Hamid_RT19-Jun-06 22:07

Hamid_RT

19-Jun-06 22:07

maybe you need to import library(lib) in your program

whitesky

Re: unresolved external symbol -- help please

hendry19719-Jun-06 22:30

hendry197

19-Jun-06 22:30

I just tried it. I just tried to add the path to the .obj (.obj is like lib too, right?) files too. it seems work. thank you guys ^_^

regards,
Hendry

CListBox Properties

chethu66519-Jun-06 21:19

chethu665

19-Jun-06 21:19

hi all

i have a problem .
In Listbox by typing the first character of a selection the item can be selected
is it possible to restrict this property of list box

if possible how?? Smile | :)

"Men never do evil so completely and cheerfully as when they do it from religious conviction"
-Pascal

Re: CListBox Properties

voorugonda prashanth19-Jun-06 21:26

voorugonda prashanth

19-Jun-06 21:26

question is not clear.

Re: CListBox Properties

Hamid_RT19-Jun-06 21:43

Hamid_RT

19-Jun-06 21:43

Can you be more specific

whitesky

Re: CListBox Properties

voorugonda prashanth19-Jun-06 21:46

voorugonda prashanth

19-Jun-06 21:46

hiiiiiiiiiii,

this is the solution...

u have to do is:

1) u need to Dervie a class from CListBox
2) map the listbox in ur application to Derived listbox class.
3)Override the virtual function OnChar in ur Derived class.

void CMyListBox::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default

//CListBox::OnChar(nChar, nRepCnt, nFlags); important
}

comment this code
CListBox::OnChar(nChar, nRepCnt, nFlags);

Regards
Prashanth.v

Re: CListBox Properties

chethu66519-Jun-06 23:08

chethu665

19-Jun-06 23:08

thanks

"Men never do evil so completely and cheerfully as when they do it from religious conviction"
-Pascal

Re: CListBox Properties

Viorel.19-Jun-06 21:47

Viorel.

19-Jun-06 21:47

Try this way. Using Add Class command, add a new MFC class derived from CListBox. Then add to this class a handler for WM_CHAR notifications. In this handler, return without calling anything.

In the dialog box where list box is used, select the list-box and then use Add Variable in order to add a control variable. In the Variable Type field, specify the name of your list-box class.

If you already have a variable for your list, then open the header file of your dialog and replace CListBox type with the name of your list-box class.

Hope it helps.

NcAPI

Le Thanh Cong19-Jun-06 21:13

Le Thanh Cong

19-Jun-06 21:13

I use NcAPI & Netcard2280 to programm for USB device. How determine a packet is NULL packet when Netcard get packet form host PC

-----------------
conglt

Problem using virtual COM port

tctan19-Jun-06 20:56

tctan

19-Jun-06 20:56

I've written an application which will use virtual COM port (USB-to-Serial) to communicate with my device. I am using CreateFile/ReadFile/WriteFile functions. It is running fine until one issue found.

With the application open, when (somehow) the USB driver reload, my application fail to perform read/write. Even after I close the application and reopen it, it fails to get the handle.

Why is it happen? Are there anything that my application need to do when the USB driver is re-loaded?

Thanks.
TC

how can i run C++ code in BREW.

nitinjdalal19-Jun-06 20:26

nitinjdalal

19-Jun-06 20:26

hi all,
How can i run C++ code in BREW application because brew has it's own function and i want to generate my own function in BREW and pass the string.
and that string i pass another string after click in emulator.can you help me out for that.
Thanks...........
Nitin Dalal.

nitin

How can FilePath change to LPCTSTR ??

mimimimilaw19-Jun-06 20:15

mimimimilaw

19-Jun-06 20:15

:(CString FilePath;
FilePath = writeFilePath+ DMID + "." + test;
// then FilePath = c:/temp/1234.jpg
objEWFFile.Open(FilePath, CFile::modeCreate | CFile::modeWrite, NULL);

It doesn't work...
How can FilePath change to LPCTSTR ??

Re: How can FilePath change to LPCTSTR ??

kakan19-Jun-06 20:19

kakan

19-Jun-06 20:19

mimimimilaw wrote:
It doesn't work...

In what way? What errors do you get? When do you get them, compile time or runtime?
Did you debug your source code?

Re: How can FilePath change to LPCTSTR ?? [modified]

_AnsHUMAN_ 19-Jun-06 20:22

_AnsHUMAN_

19-Jun-06 20:22

You can do this as
CString str="abcd";
const char* data_char = (LPCTSTR) str;
//However you shouldn't be having any errors with opening the file using a CString type filename
Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

-- modified at 2:24 Tuesday 20th June, 2006

Re: How can FilePath change to LPCTSTR ??

Weiye Chen19-Jun-06 20:27

Weiye Chen

19-Jun-06 20:27

CString has a LPCTSTR cast operator, which means you can safely do

LPCTSTR lpStr = (LPCTSTR)oMyCStringObj;

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