Visual Basic

econy wrote:

But I found it seems the threading.timer() produces many threads,like each cycle
it use a new thread to read.

MSDN wrote[^]:

System.Threading.Timer is a simple, lightweight timer that uses callback methods and is served by thread pool threads. It is not recommended for use with Windows Forms, because its callbacks do not occur on the user interface thread.

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]

The following properties have been set:
Property: [AdminUser] = true {boolean}
Property: [InstallMode] = HomeSite {string}
Property: [ProcessorArchitecture] = AMD64 {string}
Property: [VersionNT] = 6.1.1 {version}
Running checks for package 'Windows Installer 3.1', phase BuildList
The following properties have been set for package 'Windows Installer 3.1':
Running checks for command 'WindowsInstaller3_1\WindowsInstaller-KB893803-v2-x86.exe'
Result of running operator 'VersionGreaterThanOrEqualTo' on property 'VersionMsi' and value '3.1': true
Result of checks for command 'WindowsInstaller3_1\WindowsInstaller-KB893803-v2-x86.exe' is 'Bypass'
'Windows Installer 3.1' RunCheck result: No Install Needed
Running checks for package '.NET Framework 3.5 SP1', phase BuildList
Reading value 'SP' of registry key 'HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.5'
Read integer value 1
Setting value '1 {int}' for property 'DotNet35SP'
The following properties have been set for package '.NET Framework 3.5 SP1':
Property: [DotNet35SP] = 1 {int}
Running checks for command 'DotNetFX35SP1\dotNetFx35setup.exe'
Result of running operator 'ValueGreaterThanEqualTo' on property 'DotNet35SP' and value '1': true
Result of checks for command 'DotNetFX35SP1\dotNetFx35setup.exe' is 'Bypass'
'.NET Framework 3.5 SP1' RunCheck result: No Install Needed
Launching Application.
Application appears to be an application manifest
Launching application manifest via dfshim

econy wrote:

Is the VB.NET winform application multithread or single thread?

econy wrote:

if I want to use threading.timer in a VB.NET application, do I need pay
attention to the MTA, or STA?

Using stream As Stream = File.OpenWrite("path\to\your\file.txt")
   Using sw As New StreamWriter(stream)
      ...
      ' NB: No need to call Flush or Close here.
   End Using
End Using