C / C++ / MFC Discussion Boards

Jose Cezar S. Ynion6-Jul-04 22:52

6-Jul-04 22:52

Anonymous wrote:
well, can u point the main difference between MessageBox and AfxMessageBox?

AfxMessageBox - a global function.
MessageBox - a method available within a CWnd derived class

You cannot call MessageBox within a non CWnd derived class.
Ex:

class A
{
public:
void Display()
{
// error
MessageBox(...);
// should be
AfxMessageBox(...)
}
};

But in this example

class A
{
public:
void Display()
{
MessageBox(...); // OK, juts like calling this->MessageBox(..)
AfxMessageBox(...) // ok
}
};

Re: Messagebox

Jose Cezar S. Ynion6-Jul-04 22:56

Jose Cezar S. Ynion

6-Jul-04 22:56

Jose Cezar S. Ynion wrote:
But in this example

class A
{
public:
void Display()
{
MessageBox(...); // OK, juts like calling this->MessageBox(..)
AfxMessageBox(...) // ok
}

Sorry for that this should be:

class B:public CDialog
{
public:
void Display()
{
MessageBox(...); // OK, just like calling this->MessageBox(..)
AfxMessageBox(...) // ok
}

Re: Messagebox

David Crow7-Jul-04 3:02

David Crow

7-Jul-04 3:02

For starters, AfxMessageBox() is an MFC wrapper around the Win32 MessageBox() function. With MessageBox(), you supply the parent window, the caption, and the message text. With AfxMessageBox(), the parent window and the caption are handled automatically.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Messagebox

Ryan Binns6-Jul-04 23:19

Ryan Binns

6-Jul-04 23:19

Why would you want this? How would the user close the message box without buttons? If you are performing some background processing and will close the box yourself, then you don't want a message box. You want a modeless dialog box.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

SnapShot

Liger_Zero_X6-Jul-04 20:49

Liger_Zero_X

6-Jul-04 20:49

Hi,
I want to Get a SnapShot of my System, somewhat like pressing "PrtScr" Key on the Keyboard... Anyone, Sample Code please... Thanks!!! Big Grin | :-D

Re: SnapShot

Ryan Binns6-Jul-04 23:24

Ryan Binns

6-Jul-04 23:24

Look at the keybd_event() function to synthesize keystrokes, with the VK_SNAPSHOT virtual key code. Make sure you generate a key press and a key release (see the dwFlags parameter).

Hope this helps,

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Re: SnapShot

ThatsAlok6-Jul-04 23:30

ThatsAlok

6-Jul-04 23:30

::keybd_event(VK_SNAPSHOT,0x45,KEYEVENTF_EXTENDEDKEY|0,0);
use this api to get snapshot.

and getting that image into your Application you have to querry Clipboard like this
//paste
HANDLE hBitmap=NULL;
if (OpenClipboard()) hBitmap=GetClipboardData(CF_BITMAP);

CloseClipboard();
and you got the image handle in hBitmap var

I Think It will Work
-----------------------------
Alok Gupta
visit me at http://www.thisisalok.tk

Re: SnapShot

Liger_Zero_X7-Jul-04 0:42

Liger_Zero_X

7-Jul-04 0:42

what if, i don't want to press a key?! coz, i want to make it automated... thanks for the info!!!

event handling

sriraag6-Jul-04 20:49

sriraag

6-Jul-04 20:49

i have this application(exe) which is running.Now i want to develop another application in VC++ that can handle the the events that are happening inside the former.how can i do this ? can anybody help ?

thanks

sriraag

Filter's Property Pages

hpAng6-Jul-04 20:40

hpAng

6-Jul-04 20:40

Microsoft wrote:

Confused | :confused:

Although many of the filters provided with DirectShow support property pages, they are intended for debugging purposes, and are not recommended for application use. In most cases the equivalent functionality is provided through a custom interface on the filter. An application should control these filters programatically, rather than expose their property pages to users

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directX/htm/introductiontodirectshow.asp

Does anyone know how to "control these filters programatically"? Or where can I find a sample or documentation on the topic?

Very appreciate for any kind of help. Thanks. Smile | :)

Re: Filter's Property Pages

hpAng6-Jul-04 21:12

hpAng

6-Jul-04 21:12

sorry the link is:
http://msdn.microsoft.com/library/en-us/directx9_c/directX/htm/displayingafilterspropertypages

Re: Filter's Property Pages

hpAng6-Jul-04 21:15

hpAng

6-Jul-04 21:15

The link is :
http://msdn.microsoft.com/library/en-us/directx9_c/directX/htm/displayingafilterspropertypages.asp

haha, very sorry you guys... Big Grin | :-D

subclassing in win32

Manu816-Jul-04 20:06

Manu81

6-Jul-04 20:06

hai,
I want to attach a bitmap to my button control.I'm using win32 vc++ and I am just the beginner to vc++. I used loadbitmap() and sendmessage() to button control.It worked.But I was requested to do with subclassing. I pretty much have no idea.I tried MSDN. It's there for MFC (subclassdlgitem())but I want to do in win32.Can anyone help me?

Re: subclassing in win32

PJ Arends6-Jul-04 20:30

PJ Arends

6-Jul-04 20:30

Subclassing in Win32 requires that you write your own window procedure (see WindowProc in MSDN) and specify it as the lpfnWndProc parameter in the WNDCLASS structure you use to register your window class. You use the class name you used in the WNDCLASS structure in your call to CreateWindow when you want to create your button.

see MSDN for: WindowProc, WNDCLASS, RegisterClass, CreateWindow.

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Re: subclassing in win32

A T I F6-Jul-04 20:56

A T I F

6-Jul-04 20:56

You can try to do something like this....

<br />
WNDPROC wpOrigButtonProc; <br />
 <br />
LRESULT APIENTRY DlgProc(<br />
    HWND hwndDlg, <br />
    UINT uMsg, <br />
    WPARAM wParam, <br />
    LPARAM lParam) <br />
{ <br />
    HWND hwndButton; <br />
 <br />
    switch(uMsg) <br />
    { <br />
        case WM_INITDIALOG: <br />
            // Retrieve the handle to the edit control. <br />
            hwndButton = GetDlgItem(hwndDlg, ID_BUTTON); <br />
 <br />
            // Subclass the edit control. <br />
            wpOrigButtonProc = (WNDPROC) SetWindowLong(hwndButton, <br />
                GWL_WNDPROC, (LONG) ButtonSubclassProc); <br />
            // <br />
            // Continue the initialization procedure. <br />
            // <br />
            return TRUE; <br />
 <br />
        case WM_DESTROY: <br />
            // Remove the subclass from the edit control. <br />
            SetWindowLong(hwndButton , GWL_WNDPROC, <br />
                (LONG) wpOrigButtonProc); <br />
            // <br />
            // Continue the cleanup procedure. <br />
            // <br />
            break; <br />
    } <br />
    return FALSE; <br />
        UNREFERENCED_PARAMETER(lParam); <br />
} <br />
 <br />
// Subclass procedure <br />
LRESULT APIENTRY ButtonSubclassProc(<br />
    HWND hwnd, <br />
    UINT uMsg, <br />
    WPARAM wParam, <br />
    LPARAM lParam) <br />
{ <br />
    switch(uMsg)<br />
    {<br />
    case ....<br />
/* Process the messages you want here */<br />
    }<br />
/* else pass it to the original handler */<br />
    return CallWindowProc(wpOrigButtonProc, hwnd, uMsg, <br />
        wParam, lParam); <br />
} <br />

I hope this helps you out.

Re: subclassing in win32

Manu817-Jul-04 5:53

Manu81

7-Jul-04 5:53

hai,
Thanks a lot.I understood your code.But inside this subclass procedure what I should do to attach my bitmap to the button?
thanks.

Re: subclassing in win32

A T I F8-Jul-04 21:21

A T I F

8-Jul-04 21:21

Well catch WM_PAINT or something and use StretchBlt or BitBlt to draw the image in the button window. You will have to check if WM_PAINT is the most appropriate message to use here...

Guys with VsFlexGrid Experience

Pazzuzu6-Jul-04 19:45

Pazzuzu

6-Jul-04 19:45

Hi Guys,

Iam working on an Mfc Project & have to use the VsflexGrid Control(Videosoft FlexGrid -version 8,lightunicode).Have some questions regarding that & would be nice if someone could clarify it stating the exact member function to use.

[1] Have 1 Fixed Column & 1 Fixed Row,in Which I intend to enter some user Labels.
How can I enter text("Userlabeltext") in a particular cell in a fixed column or row.
Can I use the same function for entering "text" in other cells also(In non Fixed Rows & Columns).

[2]Have a row in which I have 3 cells.
In the 1st cell,I want to have a Editable ComboBox.(ie: user should see the populated combobox as well as he can type something,which would be saved & populated later in the combo).
[a] How Can I put a combobox in a particular cell inside a VsFlexGrid control.
[b]How can I populate the combobox.

[2A]In the 2nd cell,I want to have a Non-Editable ComboBox,where only populated things in the combox box should be displayed.The user is not allowed to type anything in the combobox.(Is it possible to insert a ListBox here instead of a combo).
How can I do this(either list or combo)

[2B] In the 3rd cell,want to have a checkbox.How Can I put a checkbox in this cell.

[2C] In the 4th cell,I want to have a editable textbox.
[a] How can I populate the textbox with the defaultvalue.

[3] How can I change the Font of a Text,in the fixed row & column

So Thanks..........

Doubt in Filter Driver!

Ilamparithi6-Jul-04 19:41

Ilamparithi

6-Jul-04 19:41

Hi All,

I need to develope a filter driver in 2000.

At the driver level, i need to know which files are opened, read, written and closed.

While i try to do this, Iam not able to get the full file name.

I mean, iam getting the file name without the Drive Name.

Eg.

If the file opened is C:\New\xx.txt, Iam getting the file name as \New\xx.txt.

Iam getting this info from File_Object's filename.

Also, for a mapped drive iam getting the drive name properly!

How to get the drive name correctly for other drives?

With Regards,
A.Ilamparithi.

MS-ACCESS SECURITY

vyjesh6-Jul-04 19:36

vyjesh

6-Jul-04 19:36

Hi,

How do I secure access database file. I have an application written in vc++. When the database is opened, I want to prevent the file being viewed by MS-access or make a copy of the file. Is it possible??

VYJU

Re: MS-ACCESS SECURITY

David Crow7-Jul-04 3:26

David Crow

7-Jul-04 3:26

Open the database using Access. On the Tools menu, select Security, and then Set Database Password. Now no matter how it is opened, a password must be supplied. The .MDB file can be copied from outside of Access, however. To prevent this, an OS-level security setting would be required.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

wt message is generated on window Maximize

Zeeshan Bilal6-Jul-04 19:26

Zeeshan Bilal

6-Jul-04 19:26

HI,
Wt meassge is generated on window maximmize.

and how it can be handled ....n where ...

any idea .. assume that i want to show a MessageBox
when window is Maximize after minnimizing.

any code or help;
thanx

Re: wt message is generated on window Maximize

A T I F6-Jul-04 21:05

A T I F

6-Jul-04 21:05

catch WM_SIZE in simple SDK or OnSize in MFC and they receive

SIZE_MAXIMIZED
The window has been maximized.

SIZE_MINIMIZED
The window has been minimized.

and other messages....

check MSDN....

Re: wt message is generated on window Maximize

Zeeshan Bilal6-Jul-04 21:34

Zeeshan Bilal

6-Jul-04 21:34

thanx it worksss

Can u answer mine question below here in fourm abut Slider Control

thanx

how to use CSlider Control

Zeeshan Bilal6-Jul-04 18:12

Zeeshan Bilal

6-Jul-04 18:12

HI,

I build my own Video file player.
Now wanaa use CSliderCtrl that will move onwards as the file runs ,,, same as in Windows media player
i looked in code project but this kind of sample not
there.

any sample .. or help code

thanx

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