C / C++ / MFC Discussion Boards

François Gasnier12-Nov-03 1:19

12-Nov-03 1:19

I know how to use the mschart ActiveX control under VC++6 but I can't figure how to use it once it is put in a dialog box. The file MsChart.h created by Visual Studio .NET appear very different that the one that was generated when using VC++6.
I have searched this site and been googling for a while, but I could not find any code sample showing how to set the data, modify the axes ...

Did anybody manage to do it?
Could someone point me to a VC++.NET sample showing how to use the MsChart?
Thank you in advance.

MFC

cberam12-Nov-03 1:15

cberam

12-Nov-03 1:15

HI,

I have a MFC DLL project.This created DLL sits in the third party exe.
One of the statement in the DLL code:
************************************************************************************
STRING str = STRING(GetModuleHandle("X.dll"), 0x409, STR_PROGRAMD);

where

// MessageId: STR_PROGRAMD
// MessageText:
// UMDC_PROGRAMD%0
#define STR_PROGRAMD ((DWORD)0x00001006L) in msgtable.h file
************************************************************************************

but the the variable str is returning "FormatMessage() failed for 100001006"

Pls help what could be the problem??

Thnks in advance

Need Handle of Scrollbar in list control

super12-Nov-03 0:40

super

12-Nov-03 0:40

Hi guys,
I have a List control in which i have to do some manipulation based on the horzontal movement of Scroll bar..The issue is for that i need the handle of the ScrollBar.But when i use GetScrollBarCtrl() I always always get NULL.So any idea.
Note:Base on the horizontal movemeent of Scrollbar i have to hide/show some columns in Listctrl

cheers,
Super
------------------------------------------
Too much of good is bad,mix some evil in it

Re: Need Handle of Scrollbar in list control

Roger Allen12-Nov-03 2:00

Roger Allen

12-Nov-03 2:00

GetScrollBarCtrl() is a CWnd overridable which allows replacement scrollbars to be used instead of the WS_HSCROLL and the WS_VSCROLL window styles which will be in use for the list control. If you need to read the values you should be able to use the scrollbar access function directly using the SB_HORZ and SB_VERT parameters depending on whether you need the horizontal or vertical scroll bar data.

e.g.

int hPos = m_ListCtrl.GetScrollPos(SB_HORZ);

Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!

pointer declaration

Rage11-Nov-03 23:59

Rage

11-Nov-03 23:59

Hi CPians!

What is the right way for declaring a constant pointer on a constant unsigned char ?

const unsigned char table[]= ... ;
const unsigned char *ptable = table;

This is what I thought, but when I try to do something like :

typedef const struct  
{
   unsigned int ID;
   unsigned char *IDAdr;
} IDstruct;

IDstruct table[] = { 21, table };

It brings me the error "line ## : not an adress constant" -> I understand that as my pointer not being declared as "constant", but only as a pointer on a constant... How should I do to get a constant pointer ?

Thanks a lot.

~RaGE();

Re: pointer declaration

markkuk12-Nov-03 0:36

markkuk

12-Nov-03 0:36

You don't have the cdecl program on your system?

$ cdecl
Type `help' or `?' for help
cdecl> declare ptable as constant pointer to constant unsigned char
const unsigned char * const ptable

Re: pointer declaration

Abhishek Srivastava12-Nov-03 0:59

Abhishek Srivastava

12-Nov-03 0:59

try this , this will make pointer of ur struct constant

typedef struct { unsigned int ID; unsigned char *IDAdr;} IDstruct,const LPIDstruct;

Abhishek Srivastava
Software Engg (VC++)
India ,Noida
Mobile no 9891492921 Smile | :)

Re: pointer declaration

Rage12-Nov-03 3:00

Rage

12-Nov-03 3:00

Thanks for your answer, unfortunately I am not allowed to modify this declaration (extern code).

~RaGE();

Re: pointer declaration

Antti Keskinen12-Nov-03 4:08

Antti Keskinen

12-Nov-03 4:08

To declare a constant (unchanging) pointer to a constant (unchanging) unsigned char, you would use a call like:

const unsigned char* const ptrChar = &someCharVariable;

Remember that constants must always be defined upon declaration. This means that you can do

const int iNumber = 10;

but trying a

const int iNumber;
iNumber = 10;

will fail.

In a nutshell, placing a const after the pointer type (char* const... )means that the pointer is constant, so you cannot change the address it points to after declaration. Placing a const after the pointer name (const char* ...) means that you cannot modify the memory at the address where the pointer currently points. Placing both means that you can't modify either the address pointed to, or the contents of that address.

Hope this helps.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

How to draw Bezier curve using GDI ?

P. Gnana Prakash11-Nov-03 22:59

P. Gnana Prakash

11-Nov-03 22:59

Hi all,

I want to implement the bezier curve in my program. Can any one say about whether any direct functions available for drawing the bezier curve using GDI. I

Prakash

Re: How to draw Bezier curve using GDI ?

Abhishek Srivastava12-Nov-03 1:35

Abhishek Srivastava

12-Nov-03 1:35

There are Api's, using which one can draw bezier curves like
PolyBezier and PolyBezierTo
try these APIs available in MFC as well as SDK both.

Abhishek Srivastava
Software Engg (VC++)
India ,Noida
Mobile no 9891492921 Smile | :)

Doubt in Line style

P. Gnana Prakash11-Nov-03 22:55

P. Gnana Prakash

11-Nov-03 22:55

Hi all,

I implemented different line styles (dash, dot, dash dot, dash dot dot) in my program. But all these styles are works fine, if the pen width is 1. If i select the pen width is more than 1, i couldn't get the line style. Is there any other option in GDI for selecting line style in different penwidth. Please give me some suggestions.

Prakash

Re: Doubt in Line style

Roger Allen12-Nov-03 2:05

Roger Allen

12-Nov-03 2:05

For all line styles other than PS_SOLID, they only work correctly for lines of thickness 1. If you need line styles with a larger thickness, then you will have to do the line drawing part yourself. I am sure I saw an article on this somewhere but have been unable to find a reference.

Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!

Re: Doubt in Line style

Roger Allen12-Nov-03 2:09

Roger Allen

12-Nov-03 2:09

After a further search I found what may be of help

http://www.codeguru.com/gdi/dashline.shtml[^]

Roger Allen - Sonork 100.10016
If your dead and reading this, then you have no life!

CDAORecordset::Find() trouble

AntonGogolev11-Nov-03 22:45

AntonGogolev

11-Nov-03 22:45

Check this out:

...
str.Format("[ProductID] = '%s' AND [Date] = #%s#", m_pSet->m_strProductID, COleDateTime::GetCurrentTime().Format(_T("%#m/%#d/%Y")));

lI = pShop->GetRecordCount();
if(pShop->FindLast(str) == 0)
{
pShop->AddNew();
pShop->m_lEntryID = lI;
pShop->m_dtDate = COleDateTime::GetCurrentTime();
pShop->m_strProductID = m_pSet->m_strProductID;
pShop->m_lQuantity = lQ;

pShop->Update();
}
else
{
pShop->Edit();

pShop->m_lQuantity += lQ;

pShop->Update();
}
...

Here's the problem. I try to find a record which has a given ProductID and which was created today. Although THERE ARE such records, nothing is ever found. MSDN says one has to use US date format (month-day-year) even if using non-engish version of MS Jet (I'm from Russia Smile | :)

), bun nothing is said about how the actual format string should look like. The database was created in MS Access 2K and uses short date format (something like 19.06.1994 - that's the sample in Access).

Error 207: Error 208

Re: CDAORecordset::Find() trouble

Pir8ofTampa12-Nov-03 4:14

Pir8ofTampa

12-Nov-03 4:14

I myself have had difficulty with short date fields in MS Access.

Possible Solutions:

Verify (without reformatting) the COleDateTime value that is actually returned from your table. Mine have sometimes included time even though I have set it to be exclusively a date. Also becuase you are using a short date, you must use two digits to express the year so:

str.Format("[ProductID] = '%s' AND [Date] = #%s#", m_pSet->m_strProductID, COleDateTime::GetCurrentTime().Format(_T("%#m/%#d/%y")));

Good luck.

Disabled a MFC control

jerome_data11-Nov-03 22:33

jerome_data

11-Nov-03 22:33

how to disabled (character in grey) a control in MFC? I use a modifystyle and modifystyleEX but it not works when i repaint the control. I search a example.

Thanks
Jérôme

Re: Disabled a MFC control

Elias Bachaalany11-Nov-03 22:43

Elias Bachaalany

11-Nov-03 22:43

Check CWnd::EnableWindow()

Regards,
Elias

Re: Disabled a MFC control

Juan Antonio Bermejo11-Nov-03 22:45

Juan Antonio Bermejo

11-Nov-03 22:45

Have you try 'EnableWindow'? Every CWnd object has this method, so if you have a button in a dialog attached to a CButton variable...

....................
CButton m_btMyButton;
....................

in the cpp

...

m_btMyButton.EnableWindow(FALSE);

...

Error in COmpilation of VC++ Code

RaajaOfSelf11-Nov-03 22:32

RaajaOfSelf

11-Nov-03 22:32

Hello
Ima developing a VC++ applictaion .When i try to build a applicatin that is statically linked to MFC ,it throws me this error

error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in libcmt.lib(typinfo.obj)

Can somebody help me how to fix this error ? Smile | :)

Cause is my effort;
Effect is God's effort

Re: Error in COmpilation of VC++ Code

François Gasnier12-Nov-03 1:26

François Gasnier

12-Nov-03 1:26

You will probably have to change your link options in the project settings.
I can remember there is a /NODEFAULTLIB keyword that you can set in order to avoid linking with duplicate implementation.
Also, you might search for your error code in the help index which will tell you a lot...

Re: Error in COmpilation of VC++ Code

Rajesh match12-Nov-03 2:13

Rajesh match

12-Nov-03 2:13

i think u r using single thread run time library in project settings

Harddisk Number

BoudewijnEctor11-Nov-03 22:32

BoudewijnEctor

11-Nov-03 22:32

Hi,

Do you know how to obtain a harddisks number; this is a serial (unique for each disk) number, wich I'll use for security etc.

I've have another question about this one; if I've build an app to determine the number, and it's put on a RAID system: which disk number will be returned?

Thanks

Re: Harddisk Number

Elias Bachaalany11-Nov-03 22:41

Elias Bachaalany

11-Nov-03 22:41

Hello

Check this: http://www.winsim.com/diskid32/diskid32.html

Or GetVolumeInformation() in SDK

Adjusting setup projects

BoudewijnEctor11-Nov-03 22:16

BoudewijnEctor

11-Nov-03 22:16

Hi there,

If I build a setup project for an application, I can decide wether I want to place a shortcut to my .exe on the user's desktop. This has to be done before building the installer.

But I want the user to be able to choose wether he wants that, or not! So, I need to have some kind of interaction in my setup projects, for doing this I should inlcude some checkboxes in the dialog: How can I add those, and how can I use them to deternine wether to place those shortcuts?

Thanks

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