About string ,and help me to solution one problom about zhe value and reference type! Thank you！ [modified] - C# Discussion Boards

Open link in new Tab when Mouse Middle Click...

Baeltazor19-Jun-09 18:36

Baeltazor

19-Jun-09 18:36

Hi All

I'm working on a little web browser that supports tabs and all is good but everytime I click a link that is supposed to open in a new tab or window, instead of opening a new window/tab in my own web browser that i am making, it chooses to open a new instance of the system's default web browser (Internet Explorer) and I have tried to find some articles/samples on the web but have been unsuccessful.

Does anybody know how I would go about allowing links to be opened in a new tab in the browser i am making?

Any suggestions would be greatly appreciated

thanks
jason

Re: Open link in new Tab when Mouse Middle Click...

Christian Graus19-Jun-09 19:44

Christian Graus

19-Jun-09 19:44

Well, unless I misse the memo ( possible ), the web browser control doesn't support tabs. So, you'd have to catch the event of a page opening, swallow it, and create your own tab, and open the URL there.

Christian Graus

Driven to the arms of OSX by Vista.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp

Re: Open link in new Tab when Mouse Middle Click...

Baeltazor19-Jun-09 21:25

Baeltazor

19-Jun-09 21:25

thanks christian, that's exactly what i'm trying to figure out, i obviously didn't explain my situation properly in my first message, sorry. I'll keep looking Smile | :)

Re: Open link in new Tab when Mouse Middle Click...

Christian Graus19-Jun-09 21:56

Christian Graus

19-Jun-09 21:56

http://msdn.microsoft.com/en-us/library/system.windows.forms.webbrowser_members.aspx[^]

Reading the MSDN, it looks like the NewWindow[^] event is what you want.

Re: Open link in new Tab when Mouse Middle Click...

Baeltazor19-Jun-09 22:33

Baeltazor

19-Jun-09 22:33

Thank you Christian for yout time and help, that link was very useful. I'm actually wondering how I could've overlooked that page in the first place.

Well, I am now browsing the web with full tab support yay! Thanks again christian. Maybe I could turn this into an article??

Re: Open link in new Tab when Mouse Middle Click...

Christian Graus19-Jun-09 22:46

Christian Graus

19-Jun-09 22:46

Well, if you finish the project, then I'd imagine you could write an article which covers this and other things you learned along the way. People are always writing their own browsers, so I'm sure it would be well recieved.

Re: Open link in new Tab when Mouse Middle Click...

Baeltazor19-Jun-09 22:52

Baeltazor

19-Jun-09 22:52

I'm planning on adding a new type of favorites system, but also supporting existing favorites that have been created by other browsers, once that's finished I'll start writing the article. I'd love to see what others have to say about it.

About string ,and help me to solution one problom about zhe value and reference type! Thank you！ [modified]

gjllyl19-Jun-09 14:40

gjllyl

19-Jun-09 14:40

hi,
zhe subject is that
class Class1 {
private string str = "class1.str";
private int i = 0;
static void StringConvert(string str) {
str = "string being converted.";
}
static void StringConvert(Class1 c) {
c.str = "string being converted.";
}
static void Add(int i) {
i++;
}
static void AddWithRef(ref int i) {
i++;
}
static void Main() {
int i1 = 10;
int i2 = 20;
string str = "str";
Class1 c = new Class1();
Add(i1);
AddWithRef(ref i2);
Add(c.i);
StringConvert(str);
StringConvert(c);
Console.WriteLine(i1);
Console.WriteLine(i2);
Console.WriteLine(c.i);
Console.WriteLine(str);
Console.WriteLine(c.str);
Console.Read();
}
tell me why "Console.WriteLine(str);" and "Console.WriteLine(c.str);"
zhe two sentence have two different results!
I know that zhe "string" is reference type!
but here i am puzzled!

modified on Saturday, June 20, 2009 8:09 AM

Re: About string ,and help me to solution one problom about zhe value and reference type! Thank you！

Gideon Engelberth19-Jun-09 17:31

Gideon Engelberth

19-Jun-09 17:31

While you are correct that string is a reference type, you cannot change which string the local variable str in Main is referencing from the StringConvert function since you pass it by value. All you can do is make the parameter to StringConvert refer to another string, which will have no effect outside the function.

In the case where you passed a Class1, you are modifying the reference contained in the object referred to by the parameter, which is the same object referred to in Main. If you had put the line c = new Class1(); as the first line in StringConvert, it would no longer change the value in Main because the parameter in StringConvert would now be referring to a different object.

send mail using c#

sahandshokri19-Jun-09 11:42

sahandshokri

19-Jun-09 11:42

i want to send mail to yahoo mail automatically using c# code.

Re: send mail using c#

blackhattrick19-Jun-09 11:46

blackhattrick

19-Jun-09 11:46

Here is your answer... Smile | :)

[^]

Re: send mail using c#

Christian Graus19-Jun-09 12:42

Christian Graus

19-Jun-09 12:42

I want a Porche.....

Seriously, what have you tried ? Why do you have a specific issue with yahoo mail ? A quick google leads me to believe that a lot of people are asking this, so perhaps the issue is that yahoo does not support sending mail through a third party, or through the protocols that .NET supports.

Re: send mail using c#

rishavraj19-Jun-09 23:55

rishavraj

19-Jun-09 23:55

Yahoo doesnt provide free smtp/pop3 service so you cannot use your Yahoo id to send mails from any other email client.
To use Yahoo mail you wil have to buy the Pop3 Service from yahoo.

Rishav Raj
http://hashtech.erishav.com

System.Security.SecurityException

lump1067019-Jun-09 11:25

lump10670

19-Jun-09 11:25

I have an application I made that simply gets the current directory using System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location goes up a directory level and then runs a file in that directory using System.Diagnostics.ProcessStartInfo and System.Diagnostics.Process.Start. The file works fine if I run it on my computer but if I put the file on a Shared Network Path I get the below error:

Unhandled Exception: System.Security.SecurityException: Request failed.

at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Assembly a

sm, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle rmh, Secur

ityAction action, Object demand, IPermission permThatFailed)

at System.Security.CodeAccessSecurityEngine.ThrowSecurityException(Object ass

emblyOrString, PermissionSet granted, PermissionSet refused, RuntimeMethodHandle

rmh, SecurityAction action, Object demand, IPermission permThatFailed)

at System.Security.CodeAccessSecurityEngine.CheckSetHelper(PermissionSet gran

ts, PermissionSet refused, PermissionSet demands, RuntimeMethodHandle rmh, Objec

t assemblyOrString, SecurityAction action, Boolean throwException)

at System.Security.CodeAccessSecurityEngine.CheckSetHelper(CompressedStack cs

, PermissionSet grants, PermissionSet refused, PermissionSet demands, RuntimeMet

hodHandle rmh, Assembly asm, SecurityAction action)

at Setup.Program.Main(String[] args)

The action that failed was:

LinkDemand

The type of the first permission that failed was:

System.Security.PermissionSet

The demand was for:

<PermissionSet class="System.Security.PermissionSet"

version="1"

Unrestricted="true"/>

The granted set of the failing assembly was:

<PermissionSet class="System.Security.PermissionSet"

version="1">

<IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib,

Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Read="USERNAME"/>

<IPermission class="System.Security.Permissions.FileDialogPermission, mscorlib,

Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Unrestricted="true"/>

<IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Vers

ion=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Read="T:\ClientUpdate\"

PathDiscovery="T:\ClientUpdate\"/>

<IPermission class="System.Security.Permissions.IsolatedStorageFilePermission, m

scorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Allowed="AssemblyIsolationByUser"

UserQuota="9223372036854775807"

Expiry="9223372036854775807"

Permanent="True"/>

<IPermission class="System.Security.Permissions.ReflectionPermission, mscorlib,

Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Flags="ReflectionEmit"/>

<IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Ve

rsion=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Flags="Assertion, Execution, BindingRedirects"/>

<IPermission class="System.Security.Permissions.UIPermission, mscorlib, Version=

2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Unrestricted="true"/>

<IPermission class="System.Security.Permissions.UrlIdentityPermission, mscorlib,

Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Url="file:///T:/ClientUpdate/Setup.exe"/>

<IPermission class="System.Security.Permissions.ZoneIdentityPermission, mscorlib

, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

version="1"

Zone="Intranet"/>

<IPermission class="System.Net.DnsPermission, System, Version=2.0.0.0, Culture=n

eutral, PublicKeyToken=b77a5c561934e089"

version="1"

Unrestricted="true"/>

<IPermission class="System.Drawing.Printing.PrintingPermission, System.Drawing,

Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

version="1"

Level="DefaultPrinting"/>

</PermissionSet>

The assembly or AppDomain that failed was:

Setup, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null

The Zone of the assembly that failed was:

Intranet

The Url of the assembly that failed was:

file:///T:/ClientUpdate/Setup.exe

Any ideas on how to fix this?

Re: System.Security.SecurityException

Christian Graus19-Jun-09 11:34

Christian Graus

19-Jun-09 11:34

Obviously, if it can be fixed at all, then it requires you to set the right permissions on your intranet.

Re: System.Security.SecurityException

lump1067022-Jun-09 2:24

lump10670

22-Jun-09 2:24

We were actually looking for a way to fix this through code. We don't want to tell everyone that uses our software that they have to change there intranet settings just to run one file.

two way serial communication

Arpita Patel19-Jun-09 11:05

Arpita Patel

19-Jun-09 11:05

i need to make communication between computer to another machine. and this communication like two communication. first i need data from another machine(make sure it is not computer. i have to connect it with usb com port) and then also send acknowledge from computer to another machine.

i did with it serial communciation.but it was text. i need to receive float data and also sending same data. also i need to identyfying where the next string started and when it will finished.

help reply for this as early as

Arpita Patel

Re: two way serial communication

Luc Pattyn19-Jun-09 11:45

Luc Pattyn

19-Jun-09 11:45

Hi,

The problem of mixing floats and text needs some kind of protocol. One can come up with several schemes, it depends on the kind of [ero[heral device (speed, memory, language), and the relative amount of floats versus text.

For your float data there basically are two ways to approach this:

1. use binary data, i.e. send bytes, not characters.

2. use strings to represent your float data; either apply ToString() when sending, and float.TryParse() when receiving (=more bytes, and some loss of precision); or get the bytes of a float, and turn them into a readable string, e.g. using base64 conversion (=4 ASCII char for 3 bytes of data) or hex (=2 ASCII char for 1 byte of data).

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

Re: two way serial communication

PIEBALDconsult19-Jun-09 12:53

PIEBALDconsult

19-Jun-09 12:53

Perhaps XML serialization?

Re: two way serial communication

Luc Pattyn19-Jun-09 12:58

Luc Pattyn

19-Jun-09 12:58

as the other device is "not a computer" I doubt XML is the way to go. Chances are the device has limited capabilities (limited CoreMark, few KBs of RAM, hardly an OS, C only, ...) and will dictate the way to go. we'll have to wait and see.

FWIW: Most of the time I avoided exchanging float data with small embedded systems; choosing an appropriate scale maps most physical stuff easily onto 16-bit integers.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.

trying to communication between two form in different project under one solution

Arpita Patel19-Jun-09 10:25

Arpita Patel

19-Jun-09 10:25

hey, i tried to share data between two form in different project under same solution. i have two project(project A,project B) in one solution and i want to send data from project A to Project B. and also at that time i want to activate form from project B and same time wants to close previous form. please help me in this case. i really stuck with it. i am using windows application in C# and doing serial communication.

please reply as soon as

Re: trying to communication between two form in different project under one solution

Christian Graus19-Jun-09 11:20

Christian Graus

19-Jun-09 11:20

arpi8319 wrote:
please reply as soon as

?????

If they are in the same solution, means NOTHING. You need to use something like WM_COPYDATA, or if you want to be all modern, use WCF.

Re: trying to communication between two form in different project under one solution

Shukla Rahul20-Jun-09 10:24

Shukla Rahul

20-Jun-09 10:24

Hi,

Use WCF if these 2 projects are running in different app domains. Ensure to,
-Use Named Pipe binding (I assume that both are winform applications and running on same machine)
-Implement duplex contract for notifications.

Let me know if you need help for implementing this.

C# command to turn off pc

Samb198519-Jun-09 9:31

Samb1985

19-Jun-09 9:31

What is the command in c# .net to turn off a pc with windows xp ?

Re: C# command to turn off pc

MumbleB19-Jun-09 9:51

MumbleB

19-Jun-09 9:51

Have you tried to Google[^] for this? There are many articles out there on the topic. On my search the first hit is what you are looking for. Maybe this will help.

In C#, you could use System.Management classes and the WMI class Win32_OperatingSystem.<br />
<br />
The possible flags for controlling the system<br />
<br />
0 = Log off the network.<br />
1 = Shut down the system.<br />
2 = Perform a full reboot of the system.<br />
4 = Force any applications to quit instead of prompting the user to close them.<br />
8 = Shut down the system and, if possible, turn the computer off.

Next time google first and if all else fails post here.

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