Re: System.Diagnostics.Process memory issue - C# Discussion Boards

S. Senthil Kumar9-Feb-05 9:10

9-Feb-05 9:10

If you are trying to append the string in a loop or trying to do a lot of appending, use the StringBuilder class. Otherwise just use

<br />
selectString += "Whatever text to be appended";<br />

Regards
Senthil

Re: strings

Christian Graus9-Feb-05 9:33

Christian Graus

9-Feb-05 9:33

Apart from all that - I would never, never build SQL like this. To be honest, I'd never build SQL at all in my middle tier, I'd put it all in stored procedures.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Re: strings

Jon Sagara9-Feb-05 10:41

Jon Sagara

9-Feb-05 10:41

StringBuilder[^] is what you're looking for, but as Christian said, you shouldn't be building your queries this way, especially if the text you're appending comes from user input.

Take a look at parameterized queries[^]. Also, read up on SQL injection attacks[^].

Jon Sagara
I bent my wookie.

My Articles

Re: strings

John L. DeVito9-Feb-05 10:47

John L. DeVito

9-Feb-05 10:47

I went ahead and used the += syntax for now as I'm reading up on stored procedures as I write this (pretty talented eh? :-P)

thanks for the advice all.

PS - is there an informal rule to go by as to when to use stored procedures or to use StringBuilder?

Re: strings

MoustafaS9-Feb-05 12:18

MoustafaS

9-Feb-05 12:18

why can't u try to insert
by writing:
this.yourText.insert(); // and these parameters have the starting index which will be your string's textLenght-1 and your additional string

ByMindOnlyYouCanDoIt

Re: strings

Dave Kreskowiak9-Feb-05 17:04

Dave Kreskowiak

9-Feb-05 17:04

never, Never, NEver, NEVer, NEVEr, NEVER(!!) use string concatenation to build SQL statements. All your doing is teaching someone how to get themselves fired from a developer job. Instead, teach them the best way: stored procedures and parameterized queries.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

System.Diagnostics.Process memory issue

chunyu.net9-Feb-05 7:11

chunyu.net

9-Feb-05 7:11

When I use System.Diagnostics.Process to launch a console app such as NAnt, the process hangs whenever the memory it uses exceeds some arbitrary amount.

In the NAnt example, this command line will execute to completion without errors: "NAnt.exe -buildfile:Some.Build -logfile:Some.log"

But this command line will hang and NAnt will not compile anything:
"NAnt.exe -verbose -buildfile:Some.Build -logfile:Some.log"

<br />
System.Diagnostics.ProcessStartInfo _StartInfo = new System.Diagnostics.ProcessStartInfo(command, commandParameters);<br />
System.Diagnostics.Process _Process = new System.Diagnostics.Process();<br />
_StartInfo.WorkingDirectory = workingDirectory;<br />
_StartInfo.RedirectStandardOutput = true;<br />
_StartInfo.UseShellExecute = false;<br />
_Process.StartInfo = _StartInfo;<br />
_Process.Start();<br />

TIA for any help.

Re: System.Diagnostics.Process memory issue

S. Senthil Kumar9-Feb-05 8:41

S. Senthil Kumar

9-Feb-05 8:41

I don't think it is a memory issue. I think it is happening because you have redirected standard output and have used _Process.WaitForExit() to wait till the child process completes. My guess is that the output buffer got full and because you're not reading from it, the process can't continue execution and blocks. Try moving code to read the standard output before WaitForExit(), I think that should solve your problem. For more information, read http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemDiagnosticsProcessClassTopic.asp[^]

Regards
Senthil

Re: System.Diagnostics.Process memory issue

chunyu.net9-Feb-05 9:06

chunyu.net

9-Feb-05 9:06

Yep. That's it. Thanks!

passing char[] from c++ to c# in a web method from a lecacy c++ dll

pleoncini9-Feb-05 5:49

pleoncini

9-Feb-05 5:49

try to write a webmethod written in C# which has to use a method imported from a dll written in C++.

public char[] stringa;

[DllImport(<dll_name>)]
public static extern int RPC_GetStringa( ref char[] stringatest);

[WebMethod]

public int RPC_GetStringaWs()

{
int j = -1;

stringa = new char[127];

try
{

j = RPC_GetStringa (ref stringa );

return j;
}
catch (Exception e)
{
return j;
}
}
on the other side (C++) RPC_GetStringa accepts just a array of 127 char.

It's doesn't work.. The exception is: "Can not marshal parameter #1: Ansi char arrays can not be marshaled as byref or as an unmanaged-to-managed parameter." }

Any suggestions will be very appreciated! Thanks in advance.

Paolo Leoncini

ListBox.TopIndex...

cromag9-Feb-05 5:09

cromag

9-Feb-05 5:09

I'm using a ListBox without the scrollbar and I want to have a visual indicator to show that there is more item on the top or on the bottom of the ListBox.

For the top I use TopIndex, but for the bottom ? BottomIndex doesn't exist.

So, how to know the last visible index of a listbox ?

Thanks

Re: ListBox.TopIndex...

cromag9-Feb-05 5:17

cromag

9-Feb-05 5:17

I found a way with IndexFromPoint.

Reading Outlook Attachments using MAPI33 wrapper dll using C#

keshavcn9-Feb-05 4:08

keshavcn

9-Feb-05 4:08

I'm using MAPI33 wrapper DLL in my C# program to read mails from Outlook/Exchange. I was using

the wrapper to avoid the popup messages thrown by the Outlook message guard and it almost workd

till I started reading attachments from a message. I was able to retreive attachment

size/number/name properites but was unable to open any of them. I'm facing problems with

IAttachment interface exposed by the wrapper.

This is how I'm trying to read attachments:

IAttachment tempAttach;
hr = msg.OpenAttach(intAttachNum,Guid.Empty,

__MAPI33__INTERNALS__.Message.FLAGS.DeferredErrors,

out tempAttach);

Above code gives a pointer to the Attachment object.

MAPI33.IUnknown stmUnKNown;
hr = tempAttach.OpenProperty(Tags.PR_ATTACH_DATA_BIN,

Guid.Empty,0,

__MAPI33__INTERNALS__.MAPIProp.FLAGS.DeferredErrors,

out stmUnKNown);

Above code is giving two types of errors depending on the Flag property i.e., for some I'm

getting "Invalid Property" and for others "Errors Returned."

Pls point me to any examples or additional information.

.NET remoting error

Member 16488299-Feb-05 3:49

Member 1648829

9-Feb-05 3:49

I have a client application that successfully uses a singleton remote object hosted on a seperate server. Recently I have changed the same client application to also use a second singlecall remote object. The two objects are exposed through two seperate channels. During develpment the singlecall object was on the same machine as the client application.

I mannged to get this working but when I move the new object to another machine it no longer works. All I get is an internal error message on the client saying to turn customErrors on in the server. However doing so chnages nothing.

Any ideas where I'm going wrong?

Re: .NET remoting error

S. Senthil Kumar9-Feb-05 8:43

S. Senthil Kumar

9-Feb-05 8:43

Maybe it's got something to do with the machine's CAS policy? Did you try setting the TypeFilterLevel to full?

Regards
Senthil

Logon User

sharathgowda9-Feb-05 0:50

sharathgowda

9-Feb-05 0:50

I am Logon user to create the impresonate user. When the run the code on windows 2000 I am getting the message "A required privilege is not held by the client."

Can any one let me know what privalages has to set.

For reference I am attaching the code also.

[assembly:SecurityPermissionAttribute(SecurityAction.RequestOptional, UnmanagedCode=true)]
[assembly:PermissionSetAttribute(SecurityAction.RequestOptional, Name = "FullTrust")]

[DllImport("advapi32.dll", SetLastError=true)]
public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword,
int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

[DllImport("kernel32.dll", CharSet=System.Runtime.InteropServices.CharSet.Auto)]
private unsafe static extern int FormatMessage(int dwFlags, ref IntPtr lpSource,
int dwMessageId, int dwLanguageId, ref String lpBuffer, int nSize, IntPtr *Arguments);

[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
public extern static bool CloseHandle(IntPtr handle);

[DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)]
public extern static bool DuplicateToken(IntPtr ExistingTokenHandle,
int SECURITY_IMPERSONATION_LEVEL, ref IntPtr DuplicateTokenHandle);

public unsafe static string GetErrorMessage(int errorCode)
{
int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100;
int FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200;
int FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000;

//int errorCode = 0x5; //ERROR_ACCESS_DENIED
//throw new System.ComponentModel.Win32Exception(errorCode);

int messageSize = 255;
String lpMsgBuf = "";
int dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;

IntPtr ptrlpSource = IntPtr.Zero;
IntPtr prtArguments = IntPtr.Zero;

int retVal = FormatMessage(dwFlags, ref ptrlpSource, errorCode, 0, ref lpMsgBuf, messageSize, &prtArguments);
if (0 == retVal)
{
throw new Exception("Failed to format message for error code " + errorCode + ". ");
}

return lpMsgBuf;
}

string userName;
userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name.ToString();
MessageBox.Show(userName);

IntPtr tokenHandle = new IntPtr(0);
IntPtr dupeTokenHandle = new IntPtr(0);

tokenHandle = IntPtr.Zero;
dupeTokenHandle = IntPtr.Zero;

const int LOGON32_PROVIDER_DEFAULT = 0;
const int LOGON32_LOGON_INTERACTIVE = 2;

bool returnValue = LogonUser(textBox1.Text, textBox2.Text, textBox3.Text,
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
ref tokenHandle);

somebody please help me

Re: Logon User

Mike Dimmick9-Feb-05 2:30

Mike Dimmick

9-Feb-05 2:30

From the documentation[^]:

Windows 2000: The process calling LogonUser requires the SE_TCB_NAME privilege. If the calling process does not have this privilege, LogonUser fails and GetLastError returns ERROR_PRIVILEGE_NOT_HELD. In some cases, the process that calls LogonUser must also have the SE_CHANGE_NOTIFY_NAME privilege enabled; otherwise, LogonUser fails and GetLastError returns ERROR_ACCESS_DENIED. This privilege is not required for the local system account or accounts that are members of the administrators group. By default, SE_CHANGE_NOTIFY_NAME is enabled for all users, but some administrators may disable it for everyone.

SE_TCB_NAME is known as "Act as part of the operating system" in the privilege-setting user interface. It's only given to the SYSTEM/LocalSystem account by default.

Since you don't say what you're trying to do, it's difficult to help further. If you want to create a process running under a different user account, try CreateProcessWithLogonW[^].

Stability. What an interesting concept. -- Chris Maunder

Re: Logon User

sharathgowda9-Feb-05 18:46

sharathgowda

9-Feb-05 18:46

Thanks Mike,

This is the first time I am working on the windows security can you please let me where to set the SE_TCB_NAME and SE_CHANGE_NOTIFY_NAME privalage.

I need the User name, Password and the Domian name to provide it for a windows services developed by me. I am using "this accont" option in the properties dialog of the service manager as I have to access few protected resource on the system.

While installing the service in the for the first time I need to give these deatils. So I have UI which will query for the User name and the password then I would want to validate the user name and password before mounting and starting the service.

My initial idea was to use logon user function, if it succeeds then the credential entered are correct and I can continue to start the service.

Is there any other alternate method of doing this. Please help me

thanks and regards
Sharath

Re: Logon User

Heath Stewart11-Feb-05 7:05

Heath Stewart

11-Feb-05 7:05

sharathgowda wrote:
This is the first time I am working on the windows security can you please let me where to set the SE_TCB_NAME and SE_CHANGE_NOTIFY_NAME privalage.

That's why you need to read the documentation he linked. Those privileges are granted to users through the security configuration of the machine or domain (which applies to the machine). It's all covered in linked documentation from the documentation you were given.

You do not need to use LogonUser to prompt for the username and password, however. You only need the credentials. If you want to authenticate that the credentials are correct than calling LogonUser is by far the easiest way to authenticate them.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles] [My Blog]

Tabcontrol - transparent

Member 13542768-Feb-05 23:49

Member 1354276

8-Feb-05 23:49

Hello...

I have some problems with my tabcontrol. I would like to make it transparent, but I cant....is there any way to make the tabpages AND the tabs transparent? If there is a way to do this, please help me..

//Carnilmo

UI control components for .Net

ppp0018-Feb-05 23:16

ppp001

8-Feb-05 23:16

Hi all,

Are there any good third-parties UI control components for .NET ?
I want to use them to re-decorate the view design of my project.

Thanks

Re: UI control components for .Net

Colin Angus Mackay8-Feb-05 23:58

Colin Angus Mackay

8-Feb-05 23:58

Yes, there are lots - Some of them even advertise on CP. But, to get a better response you should be more specific about the types of controls that you want.

Do you want to know more?
WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and Forums

mapi components for .net

ppp0018-Feb-05 23:13

ppp001

8-Feb-05 23:13

Hi all,

My project need a MAPI component for those mapi and smtp encode
and decode. Do anyone know any good third-parties components on it which I
can called the component by C# ?

Thanks

How to add Check Boxes for Extra Column in a DataGrid?

pubududilena8-Feb-05 20:32

pubududilena

8-Feb-05 20:32

hi all,
I am doing a C# Application.

I want to add check Boxes to Extra Column in a DataGrid..Other thing is when check Box Click I need to do some oprations..
("suppose that when I click check box in a DataGrid Column, I need to popup Message")

How do I do this?
please any one know this please help me.
Thanks in advance

Re: How to add Check Boxes for Extra Column in a DataGrid?

Christian Graus9-Feb-05 9:37

Christian Graus

9-Feb-05 9:37

I reckon the reason no-one is answering is that this question is well answered in CP articles, and elsewhere on the web.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

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