Re: GetDisplayNameOf problems with Folder settings - C / C++ / MFC Discussion Boards

Blake Miller3-Dec-04 4:11

3-Dec-04 4:11

Here's an idea...

Look at the beginning of the class definition for CFileDialog...

class CFileDialog : public CCommonDialog
{
DECLARE_DYNAMIC(CFileDialog)

public:
// Attributes
OPENFILENAME m_ofn; // open file parameter block

Whoa! There's an OPENFILENAME m_ofn member variable, and YOU DO NOT CONTROL IT'S SIZE!
You would have to rebuild your MFC DLL or rebuild the static MFC library to which you are linking, using the NEW size. Anyway, that is why you get the crash - you write to data that overwrites something else!

If you really need these new fields, you are going to have to 'swipe' the CFileDialog source code and make your own using the new data structure. Otherwise, just use OpenFileName as David Crow suggests.

Re: CFileDialog crashes in Platform SDK

Marius Bancila3-Dec-04 4:29

Marius Bancila

3-Dec-04 4:29

First, my project is too large and I don't want to go and replace everything with OpenFileName().

Second, when I have to define _WIN32_WINNT to 0x0501 because I need it to use other functions that are define like

<br />
#if (_WIN32_WINNT >= 0x0500)<br />
//here is the function<br />
#endif<br />

so OPENFILENAME will have the extra three data members. If Platform SDK provides me this (actually) new structure doesn't it also provide the necessary lib? Because of my settings it should try to link first to SDK libs and only after (if not found) to VS6.0 old libs.

help.....

namaskaaram3-Dec-04 1:35

namaskaaram

3-Dec-04 1:35

does anyone know how to communicate with the Windows MIDI driver thru USB.???

dll export problem

Orkun GEDiK3-Dec-04 0:55

Orkun GEDiK

3-Dec-04 0:55

Hello,

I am developing a DLL on eVC++ 4.0 in order to call some complex API functions through VS.NET 2003. But, VS.NET 2003 is generating an error at below;

An unhandled exception of type 'System.MissingMethodException' occurred in tester.exe

It is an WCE MFC AppWizard (dll) project. I cannot call even simple function. Sample code at below;

EXTERN_C
__declspec(dllexport)
int Tester(int a, int b)
{
return(a+b);
}

VS.NET code is a "Smart Device Application";

Imports System.Runtime.InteropServices

Public Class Form1
Inherits System.Windows.Forms.Form
Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu

Declare Function Tester Lib "wtest.dll" (ByVal a As Integer, ByVal b As Integer) As Integer

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim c As Integer
c = tester(1, 1)
End Sub
End Class

I can see the "Tester" function at dumpbin output. Also, I declared "Tester" in .def file at below;

; wtest.def : Declares the module parameters for the DLL.

LIBRARY "WTEST"
;DESCRIPTION 'WTEST Windows CE Dynamic Link Library'

EXPORTS
Tester
; Explicit exports can go here

What do you suggest about this problem?

Regards,

Orkun GEDiK
SAP R/3 Software & System Support Specialist
ASTRON

vtable layout in vc++ for derived classes

Member 13822803-Dec-04 0:43

Member 1382280

3-Dec-04 0:43

I was reading through an article by Jan

Visual C and C++ (General) Technical Articles

C++: Under the Hood
Jan Gray

March 1994

struct P {
int p1;
void pf(); // new
virtual void pvf(); // new

};

struct Q : P {
int q1;
void pf(); // overrides P::pf
void qf(); // new
void pvf(); // overrides P::pvf
virtual void qvf(); // new

};

Most C++ implementations will share or reuse an inherited base’s vfptr. Here Q did not receive an additional vfptr to address a table for its new virtual function qvf(). Instead, a qvf entry is appended to the end of P’s vftable layout. In this way, single inheritance remains inexpensive. Once an instance has a vfptr it doesn’t need another one. New derived classes can introduce yet more virtual functions, and their vftable entries are simply appended to the end of their one per-class vftable.

Does that mean Q will use P's vftable? If both P and Q share the same vftable?
I could not get exactly if some one can help me understand that properly?

Converting VARIANT data type

Sahir Shah2-Dec-04 23:39

Sahir Shah

2-Dec-04 23:39

I have a wrapper function generated by the ClassWizard from a type library which goes like this.

<br />
VARIANT ClassA::GetSession(const VARIANT& varItem)<br />
{<br />
  VARIANT result;<br />
  static BYTE parms[] =   VTS_VARIANT;<br />
  InvokeHelper(0x7dd, DISPATCH_METHOD, VT_VARIANT, (void*)&result, parms,<br />
    &varItem);<br />
  return result;<br />
}<br />

I result is an object of ClassB. How do I convert the VARIANT to an object of ClassB and call it's methods ?

GetDisplayNameOf problems with Folder settings

Digvijay Chauhan2-Dec-04 23:34

Digvijay Chauhan

2-Dec-04 23:34

Hi,

I'm trying to use the IShellFolder::GetDisplayNameOf method to get the filename in a drag drop application. But the function behaviour is dependent on the display settings of folders. When i choose to hide file extensions for known filetypes it creates problems and returns only the filename(no extension) and if i choose to display extensions for all files i get the filename with extension.

Can someone please tell me how to get rid of this behaviour i.e. get the filename with extension no matter what the folder displayt settings are.

Thanks in advance,

DS

Re: GetDisplayNameOf problems with Folder settings

David Crow3-Dec-04 6:20

David Crow

3-Dec-04 6:20

Digvijay Singh Chauhan wrote:
I'm trying to use the IShellFolder::GetDisplayNameOf method to get the filename in a drag drop application. But the function behaviour is dependent on the display settings of folders. When i choose to hide file extensions for known filetypes it creates problems and returns only the filename(no extension) and if i choose to display extensions for all files i get the filename with extension.

I would think this to be intended behavior as that is what "display name" implies. If the shell has been configured to hide the file extension, shouldn't the interface respect the setting?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Make each cell in a CListCtrl a little bigger

anderslundsgard2-Dec-04 23:32

anderslundsgard

2-Dec-04 23:32

How do I do to make CListCtrl cells bigger in height? I want them for e.g. to be 20 pixels.

_____________________________

...and justice for all

APe

Re: Make each cell in a CListCtrl a little bigger

Antony M Kancidrowski3-Dec-04 5:30

Antony M Kancidrowski

3-Dec-04 5:30

You will need to make the control owner-draw and then you can use WM_MEASUREITEM to return the size with the appropriate height set.

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Re: Make each cell in a CListCtrl a little bigger

anderslundsgard5-Dec-04 5:50

anderslundsgard

5-Dec-04 5:50

You mean I should overload the:

CWnd::OnMeasureItem(int nIDCtl, LPMEASUREITEMSTRUCT lpMeasureItemStruct);

function?

I've tried it but the function never seams to be called...

_____________________________

...and justice for all

APe

Re: Make each cell in a CListCtrl a little bigger

Antony M Kancidrowski5-Dec-04 11:34

Antony M Kancidrowski

5-Dec-04 11:34

Have you changed the control to owner-draw?

Do you also realise that you will have to draw the items in the list control yourself too!?

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Re: Make each cell in a CListCtrl a little bigger

anderslundsgard5-Dec-04 22:21

anderslundsgard

5-Dec-04 22:21

Do I select the CListCtrl to be "an owner-draw control" by selecting that in the Properties window in the recource view? Is that "the thing to do" if I want to overrride functions like CListCtrl::DrawItem()?

_____________________________

...and justice for all

APe

Re: Make each cell in a CListCtrl a little bigger

Antony M Kancidrowski5-Dec-04 22:32

Antony M Kancidrowski

5-Dec-04 22:32

Yes. If you look here at cp you will find quite a few owner-draw controls based on CListCtrl. They may be of some help if this is the first one that you are doing.

Good luck!

Ant.

I'm hard, yet soft.
I'm coloured, yet clear.
I'm fruity and sweet.
I'm jelly, what am I? Muse on it further, I shall return! - David Walliams (Little Britain)

Re: Make each cell in a CListCtrl a little bigger

anderslundsgard5-Dec-04 23:41

anderslundsgard

5-Dec-04 23:41

Tnx for help. I'll try to find some artickles about custom draw.

_____________________________

...and justice for all

APe

How I can stop an USB-drive from my application?

Rolf Faßler2-Dec-04 23:20

Rolf Faßler

2-Dec-04 23:20

Hi, i have the following problem:
In my application (.NET) the user can plug in an USB-drive and the software starts with a download from this drive automatically. After downloading I will stop this USB-drive, so that the user can pull out the USB-drive immediately.

Please help me!
Thanks!
Rolf

How to put tables into RichEdit

Lee Seung Ic2-Dec-04 21:43

Lee Seung Ic

2-Dec-04 21:43

Hi~~~~ guys

I really want to know how to make a table editor
I am tring to use RichEditCtrl in order to insert tables in editor program, but I really don't know about that. I have no idea about that!
I am goint to die!!!!!!!
please tell me your advise

have a nice day
cheers~~~~~~
^____________^

how to change

vc-programmer-2-Dec-04 20:51

vc-programmer-

2-Dec-04 20:51

now,i'm writing mdi application.
my demo application using tab control.(not mdi tab)
tab control create with static control for display image.

When i start run demo,images is load.
next, i want to change another image while demo is running.

following code i using ....it is not ok..
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
void CMyView::OnApply()
{
CMy_TabDlg *dlg = new CMy_TabDlg;
if (!dlg->Create(IDD_My_DLG, this))
return;
else
dlg->Load_samplephoto("image/none.bmp");
}

Problem linkage

JensB2-Dec-04 20:25

JensB

2-Dec-04 20:25

Hi,

I seem to have a problem with linking an MFC application.
I get the following errors:
error LNK2001: unresolved external symbol __imp__floor
error LNK2001: unresolved external symbol __imp__atof
error LNK2001: unresolved external symbol __imp__atof

Am i forgetting a library to link with or what could cause this problem?

Best regards,
Jens

Re: Problem linkage

Nish Nishant2-Dec-04 20:50

Nish Nishant

2-Dec-04 20:50

Make sure that both your main project and the library you are using are compiled with the same CRT linkage options (multithreaded, singlethreaded, static, dll etc)

My blog on C++/CLI, MFC/Win32, .NET - void Nish(char* szBlog);
My MVP tips, tricks and essays web site - www.voidnish.com

Only Numeric value in Edit Box

zahid_ash2-Dec-04 19:42

zahid_ash

2-Dec-04 19:42

HI
How can I enter only numeric value in Edit Box
I checked its Property Numeric , but i cannot allow
value with decimal like 34.45

i not want to enter alphabets characters in it , how can i handle or do it

thanx

Regards.

Re: Only Numeric value in Edit Box

Vikram Kashyap2-Dec-04 19:51

Vikram Kashyap

2-Dec-04 19:51

Hi,

You run a loop and check the ASCII value of the charter entered into that edit box. If the value is falling between 97 - 122 (means user is trying to enter some alphabets using lower case), if the value is falling between 65 - 90 (means user is trying to enter some alphabets using upper case). Here you can give the appropriate message.

Bye....

Roll eyes | :rolleyes:

Re: Only Numeric value in Edit Box ( Where i catch the key press event )

zahid_ash2-Dec-04 20:43

zahid_ash

2-Dec-04 20:43

I got the idea from your reply thanx

I want to check the ASCII value as i press key from key board that is it
a vlid key pressed .

Where can i catch / check that key pressed event fired on Edit Box .

thanx

Regards.

Re: Only Numeric value in Edit Box

Nish Nishant2-Dec-04 20:45

Nish Nishant

2-Dec-04 20:45

First set the ES_NUMBER style so that only numbers and . can be entered. Then handle EN_UPDATE, use GetWindowText to get the edit box text, search for a . and if a . is found, remove the . and call SetWindowText.

Nish

My blog on C++/CLI, MFC/Win32, .NET - void Nish(char* szBlog);
My MVP tips, tricks and essays web site - www.voidnish.com

Re: Only Numeric value in Edit Box

zahid_ash2-Dec-04 21:01

zahid_ash

2-Dec-04 21:01

Hi,

I tried this but it not taking (.) Decimal ( point)

I want Decimal (point) there (.)

as 344.455 ;

but ES_NUMBER is entering it 344455;

waintg for reply
thanx

Regards.

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