Re: graphics in c - C# Discussion Boards

22-Apr-04 2:55

Without physical access or security rights on the remote machine, you're pretty much sunk. You may need to bring IT in on this one, if you can pull them away from all their important work...you know, solitaire, civ, playing XBox in the back room, that sort of stuff.

Once you get install the remote debugging tools, you're pretty much set and you obviously know what you're doing from there.

Microsoft MVP, Visual C#
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Re: Remote Debugging

Tom Larsen22-Apr-04 4:41

Tom Larsen

22-Apr-04 4:41

If you can't install the debugger tools how do you debug it? Remote Debugger is not a way to work around the lack of debugging tools but a tool to use in special cases and this doesn't sound like its applicable.

You are pretty much stuck without a little help from IT. Remote Deubgging is very iffy when crossing sub-net boundries in the first place let alone a machine sitting in a DMZ (connections between the DMZ and trusted nets should be limited by any sane IT admin). Then there is the question of how domains are configured going between the trusted net and the DMZ. They very well maybe completely seperate domains which adds a wrinkle. Besides, installing the Remote Debugger on a production machine might be a security hazard that maintainers don't want to deal with.

The best thing I can recommend is setting up another machine that closely approximates the machine/system in question. Simply put it might be impossible to get the Remote Debugger to work out of a machine in the DMZ because of security policies in place. Without further input from your IT staff who knows what is going wrong. Hopefully you aren't tinkering with live machines in the first place!

Event in visual C#

Hemant Mane22-Apr-04 0:57

Hemant Mane

22-Apr-04 0:57

Hi,
I want to use Keypress event in my windows form. When user press enter that time i want to catch that event. and how to use the keypress event because in visual c# i never seen ASCII keys. Tell me how to catch keypress event and use ASCII values for trap the key which is press by the user.

Thank You for Help,

(Hemant Uttam Mane)

Re: Event in visual C#

A.Wegierski22-Apr-04 1:22

22-Apr-04 1:22

Web or Win Form?

There are some events and properties in WinForm to see keyboard: KeyPreview, KeyPress, KeyDown etc. See EventArgs and KeyData, KeyChar, KeyCode properties.

Hi,
AW

Re: Event in visual C#

Heath Stewart22-Apr-04 2:59

How to use variable in property (attribute)

22-Apr-04 2:59

There's many ways of doing this. If you want to catch these in your derivative class, override OnKeyDown. External to your class, handle the KeyDown event. This is to catch and potentially "handle" the key without it being passed to the target window. If you don't care about stopping it from being dispatched, you can handle either KeyPress or KeyUp.

In there, you actually use the KeyEventArgs - not the EventArgs like the other response mentioned - to get the Keys enumeration member for pressed keys, or just the ASCII character value itself. See the documentation for the KeyEventArgs members for more details.

If you want to catch keys throughout your application (say, for configurable hot keys), implement the IMessageFilter class and add your implementing using Application.AddMessageFilter. You get a Message structure that contains the message (such as WM_KEYDOWN) and you can get the data from the WParam and LParam properties. You can also return true to signal that you've handled it and the message should not be dispatched.

Microsoft MVP, Visual C#
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graphics in c

kcal22-Apr-04 0:09

kcal

22-Apr-04 0:09

i am using visual studio to make some histogram graphs and pie graphs of standered divation but the programme does not recognize the graphics.h header file. how should i make the graphs and please tell what should i do to this heard file (graphics)

help me in graphics

Re: graphics in c

Mazdak22-Apr-04 0:42

Mazdak

22-Apr-04 0:42

This is C# forum not C forum. Post this in VC++ forum.

Mazy

"One who dives deep gets the pearls,the burning desire for realization brings the goal nearer." - Babuji

Re: graphics in c

Dave Kreskowiak22-Apr-04 0:41

Dave Kreskowiak

22-Apr-04 0:41

C# doesn't use header files. You'll have to rewrite the C++ constants, structures, function headers, whatever your trying to use in the header file, into C# code.

RageInTheMachine9532

A.Wegierski22-Apr-04 0:05

Re: How to use variable in property (attribute)

22-Apr-04 0:05

I want to use a variable (or constant) in following class property:

[EventTrackingEnabled(true),ObjectPooling(true,1,50)]
public class Aktualizacje : ServicedComponent
{...

instead of number 50 in many classes in many projects of one solution. Is it possible? Thx in adv

Hi,
AW

Heath Stewart22-Apr-04 3:00

Re: How to use variable in property (attribute)

22-Apr-04 3:00

You can declare constants and use those in your attributes, but not variables. Since attributes are metadata, the values must be defined at compile-time, not at runtime.

Microsoft MVP, Visual C#
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leppie22-Apr-04 7:12

leppie

22-Apr-04 7:12

Just overload the constructor, very handy with attributes. Remember attributes are readonly because they are stored in metadata, and hence, can be changed at runtime.

^{top secret AdvancedTextBox}

Re: How to use variable in property (attribute)

A.Wegierski22-Apr-04 19:42

Exit statment in visual C#

22-Apr-04 19:42

Thx for all

Hi,
AW

Hemant Mane21-Apr-04 23:54

Hemant Mane

21-Apr-04 23:54

Hi friends
I have a problem. I have a login form in visual C# in which user must enter username amd password and then click login. If username or password is blank then one messegebox display that "Please enter username and password". After that i want to exit that sub. In Visual besic .Net there is command "EXIT SUB". In visual C# there is a static method call Application.exit but it is for close the whole application but i want only to exit the event and application should not be close.

Please reply me as early as possible
Thank you.

(Hemant Uttam Mane) Smile | :)

A.Wegierski22-Apr-04 0:19

22-Apr-04 0:19

Application.Exit() static method. See help

Hi,
AW

Heath Stewart22-Apr-04 3:01

22-Apr-04 3:01

He said he didn't want to call that and exit the whole application.

Microsoft MVP, Visual C#
My Articles

A.Wegierski22-Apr-04 19:59

22-Apr-04 19:59

Sorry

Hi,
AW

C++ Bit Fields implementation in C#

SJ_Phoenix22-Apr-04 0:42

SJ_Phoenix

22-Apr-04 0:42

normally you can exit a sub (in C# it's called method) with return....like this:

public void Login()
{
    //do some stuff here.....
    return;
}

Vini Deep21-Apr-04 23:33

Vini Deep

21-Apr-04 23:33

Hi,

I have a structure declared with bit fields in one of the C++ dll I am calling in my c# application. How can I change it to C# type struct?

typedef unsigned int UINT32;
 

typedef struct DEV_TYPE 
{
  UINT32 ReadCdR        :1;
  UINT32 ReadCdRw       :1;
  UINT32 ReadDvdRom     :1;
  UINT32 ReadDvdRam     :1;
  UINT32 ReadDvdMinusR  :1;
  UINT32 ReadDvdMinusRw :1;
  UINT32 ReadDvdPlusR   :1;
  UINT32 ReadDvdPlusRw  :1;
  UINT32 WriteCdR       :1;
  UINT32 WriteCdRw      :1;
  UINT32 Reserved0      :1;
  UINT32 WriteDvdRam    :1;
  UINT32 WriteDvdMinusR :1;
  UINT32 WriteDvdMinusRw:1;
  UINT32 WriteDvdPlusR  :1;
  UINT32 WriteDvdPlusRw :1;
  UINT32 TapeDrive      :1;
  UINT32 Reserved       :15;
} DEV_TYPE;

I have read in MSDN that C# does not support bit fields. Is there any method to implement this structure in C#? Pls help..

Thanks

Vini

A.Wegierski22-Apr-04 1:10

22-Apr-04 1:10

Use BitArray(sealed) or BitVector32 or try to create new class using uint and next define set/get properties:

private uint a=0;
public uint A
{
set { A=value; }
get { return a; }
}
public uint A0
{
set { a &= 0xFEU; if(value>0) a+=0x1U; }
get { return a & 0x01U; }
}
...

Hi,
AW

Vini Deep22-Apr-04 1:31

Vini Deep

22-Apr-04 1:31

I got it with BitVector32 BitVector32.CreateSection Method and get/set methods.

Thanks Rose | [Rose]

Vini

Member 363026618-Dec-08 19:53

Member 3630266

18-Dec-08 19:53

Hi Vini,
I am also having the same problem using bit fields in C#. Is it possible for you to post ur sample code?

Thanks,
- Prerna

Tim Kohler22-Apr-04 1:22

Tim Kohler

22-Apr-04 1:22

Your C# code could just pass/receive a uint from the .dll. Just use the bitwise operators in C# to set up or read the various bits.

You'd have to define your bits differently and wouldn't really use a 'bit field' but you'd get the same effect of storing several bools in a single 32 bit variable.

i.e.

C++:

const UINT32 ReadCdR = 0x00000001;
const UINT32 ReadCdRw = 0x00000002;
const UINT32 ReadDvdRom = 0x00000004;
...
const UINT32 TapeDrive = 0x0000FFFF;

bool DoSomething(UINT32 devType)
{
if (devType & ReadCdR)
...
}

C#:

private static uint ReadCdR = 0x00000001;
private static uint ReadCdRw = 0x00000002;
private static uint ReadDvdRom = 0x00000004;
...
private static uint TapeDrive = 0x0000FFFF;

public static CallSomethingInDll()
{
uint val = ReadCdR | ReadCdRw | TapeDrive;
bool ret = CPPWrapperOrManagedClass.DoSomething(val);
}

A.Wegierski22-Apr-04 19:57

22-Apr-04 19:57

C# has constants too

Hi,
AW