Re: prevent desktop screen capture - C / C++ / MFC Discussion Boards

shibby25-Oct-04 1:49

25-Oct-04 1:49

Hi!

I'm going to code an application which uses the IrDA-devive of my PDA. Until now everything is going ok, but now i stuck at the question how to create specific frequencies and single pulses of a specific length. I've read in the source of win-lirc that pulses can be created by setting SETDTR & SETRTS, but it never worked at my application.

Hope that someone can help me with that

Thx a lot for all replies
shi`BBy

Changing Menu font size

Member 144737325-Oct-04 1:41

Member 1447373

25-Oct-04 1:41

i would like to know how to change the font size using MFC. don't reply that there is an existing article with source code, that one i tried and it has some restrictions as it is not derived from CMenu.

on com in .NET

ppp00125-Oct-04 1:20

ppp001

25-Oct-04 1:20

Hi all,

how can I create a COM in VC++.NET, which project template should I choose ?

Thanks
Patrick

Re: on com in .NET

Kevin McFarlane25-Oct-04 1:32

Kevin McFarlane

25-Oct-04 1:32

There should be a template for MFC app. or ATL app. Choose one of those and you will be presented with further options.

Kevin

UpdateWindow() vs InvalidateRect()

J.B.25-Oct-04 0:33

J.B.

25-Oct-04 0:33

Hi guys,

Can anyone explain the differences between the following two calls:

UpdateWindow(hWnd);

and

InvalidateRect(hWnd, NULL, FALSE);

If I replace one with another, the app would be drawn differently. But I couldn't tell why by reading the MSDN docs Frown | :(

Thanks alot

Re: UpdateWindow() vs InvalidateRect()

J.B.25-Oct-04 5:00

J.B.

25-Oct-04 5:00

I think I sort of know now -

UpdateWindow(hWnd) only places a WM_PAINT message in the message queue, which leads to an execution of the WM_PAINT's message handler finally. If at that time the client area is all validated already, the window will not be re-painted.

On the other hand, InvalidateRect(hWnd, NULL, FALSE) explicitly invalidates the client area and then sends a WM_PAINT message. This makes sure the window will always be re-painted when the WM_PAINT message handler reaches its time. It does two things instead of just one.

Please correct me if I am wrong here.

Thanks

prevent desktop screen capture

A_Yakout25-Oct-04 0:23

A_Yakout

25-Oct-04 0:23

i made picture viewer album program how i can stop or disable or prevent any other program from make image capture to my program

Re: prevent desktop screen capture

A_Yakout25-Oct-04 20:31

A_Yakout

25-Oct-04 20:31

i made picture viewer album program how i can stop or disable or prevent any other program from make image capture to my program

Someone help me with 'OnDraw' 'Invalidate' synchronization with other method in my subclass of CView?

Velja Radenkovic25-Oct-04 0:14

Velja Radenkovic

25-Oct-04 0:14

I'll try to be as simple as possible.

in CMyView i have:

void CMyView::onSample(UCHAR* in_buffer)
{
valueArray = (USHORT*)in_buffer;
valuesInited = true;
this->InvalidateRect(okvirAP);
valuesInited = false;
}

I do not want 'valuesInited = false;' to happen until the end of OnDraw function execution (fired by InvalidateRect).

I was trying with CCriticalSection but obviously i don't know to use it.

Re: Someone help me with 'OnDraw' 'Invalidate' synchronization with other method in my subclass of CView?

dharani26-Oct-04 21:55

dharani

26-Oct-04 21:55

come on ... You need to have a global variable acting as a flag . Declare
bool valuesInited in view.h ( in the class) and have a flag variable ( say int flag) to note that OnDraw is called due to OnSample() . So In OnDraw() do as below

OnDraw()
{
if ( flag==1)//means OmDraw() is called due to onSample()
{
valuesInited=false;
}
}

Dharani Babu S

Frame Windows -- best strategy

0v3rloader24-Oct-04 22:28

0v3rloader

24-Oct-04 22:28

Hello,

I am doing a project at the moment which basically should allow creation of frame windows - and their associated views with specific purposes - automatically.

My problem is I don't really know what the best strategy to employ is. I mean, I can't use an MDI architecture as the frame windows have to be created independently - separately from each other - and if I use the SDInterface I am limited to one frame window only.

How do I do about this with MFC?

Thank you very much,

David

Re: Frame Windows -- best strategy

Chris Richardson25-Oct-04 11:43

Chris Richardson

25-Oct-04 11:43

Here's a couple links. The first one has a message that says VC7 can create this "multiple top level frame" type app using the app wizard. I haven't tried it so I don't know how good it is. Anyways, best of luck!

http://www.codeproject.com/docview/multitop.asp[^]

http://www.codeproject.com/docview/singviewmuldocs.asp[^]

Chris Richardson

SDI Application - Multiple Tables

Member 141987724-Oct-04 21:41

Member 1419877

24-Oct-04 21:41

Hi friends....

I am working on a SDI application with database support. I require two tables for my application. While configuring the application wizard i specified both the tables in the Data Source when asked. Everything went fine. The application is running well. But if i want to add a new record in a table then it does not allow and states that "Database is Read Only".

I went again making the same appliaction with a single table, and when i tried to add a new record it did successfully.

Why is it happening that when using two tables the database is openeing as Read Only. I am not using Open function at all, since the application wizard itself opens it up. It happens fine when i use one table. It should do with two tables too.

Please solve this problem of mine.

Thanks.

Pankaj

Re: SDI Application - Multiple Tables

David Crow25-Oct-04 5:08

David Crow

25-Oct-04 5:08

Pankaj_Agarwal wrote:
Why is it happening that when using two tables the database is openeing as Read Only.

The query that was created no doubt has a JOIN in it. A JOINed query cannot be updated. You'll need to update each table separately.

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

Re: SDI Application - Multiple Tables

Member 141987725-Oct-04 17:55

Member 1419877

25-Oct-04 17:55

Hi,

Can you please let me know how to perform this task. Or please let me know that how to use two or more tables in a SDI application so that at any place or time any table can be updated.

Please do help meout !!!!

Pankaj

Re: SDI Application - Multiple Tables

David Crow26-Oct-04 2:47

David Crow

26-Oct-04 2:47

Like I said, you'll need to update each table separately. For example, if table A had customer information in it and table B had order information in it, you would first add a new row to table A, then you would add a new row to table B. They would be "tied" together via the primary/foreign key.

---------------      ---------------
| Table A     |      | Table B     |
---------------      ---------------
| Primary Key |------| Foreign Key |
| Name        |      | Part #      |
| Address     |      | Quantity    |
| Phone       |      |             |
---------------      ---------------

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

Re: SDI Application - Multiple Tables

Member 141987726-Oct-04 21:23

Member 1419877

26-Oct-04 21:23

Hi,

Dear, this is the problem...my two tables are not related to each other. Actually one table has the header of the company which i am displaying on the top and the other table has all the details which has to be displayed, edited and add on the window.

Both the tables have no relation at all with one another. In such a case what to do.

And also if the tables have realtion as Primary Key- forign Key then as you said to update each table separately, in that case alsoboth the table firlds are being displayed on the window, and after a execute the AddNew (), it shows the error that the "Database is read only"...

Please look into it.

Thanks,

Pankaj

Re: SDI Application - Multiple Tables

David Crow27-Oct-04 2:37

David Crow

27-Oct-04 2:37

Pankaj_Agarwal wrote:
Both the tables have no relation at all with one another. In such a case what to do.

Start over. When AppWizard asks you for the table, only specify one of them, then create the other using ClassWizard. Or, create the application with no database support, then use ClassWizard to create two classes derived from CRecordset.

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

VoIP implementation

alihammad24-Oct-04 21:25

alihammad

24-Oct-04 21:25

hi
i have a task to implement VoIP but i dont have any idea about it ... i have read some tutorials about VoIP and got some basic idea... but i dont have any clue how to implement it in vc++.... is there anybody who can help me in this problem ...
ill be gratreful

regards
ali hammad

VoIP implementation in vc++

alihammad24-Oct-04 21:24

alihammad

24-Oct-04 21:24

Re: VoIP implementation in vc++

dharani26-Oct-04 21:59

dharani

26-Oct-04 21:59

What exactly is your requirement ..?

Dharani Babu S

flash control

vc-programmer-24-Oct-04 21:20

vc-programmer-

24-Oct-04 21:20

how to use flash in vc++.

WHy compile error?

ting66824-Oct-04 21:18

ting668

24-Oct-04 21:18

const UINT msgID = RegisterWindowMessage("SomeString");

.
.
.

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case msgID:
// do something
}
}

after compile, the error is :
error C2051: case expression not constant

why?

thanks

Re: WHy compile error?

Lim Bio Liong24-Oct-04 22:12

Lim Bio Liong

24-Oct-04 22:12

Hello ting668,

C/C++ compilers require the switch/case statements to use constant literals or macros (that work out to actual literal values).

A statement like the following :

case msgID:

is no good to the compiler because the compiler does not know what "msgID" is during compilation.

Regards,
Bio.

Re: WHy compile error?

PJ Arends24-Oct-04 22:17

PJ Arends

24-Oct-04 22:17

Because the value of msgID is not known at compile time, it is generated at run time, and the compiler must know the value of any constant used in case statements. You have to use an if else construct for registered messages.

"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!

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.