VB.Net Signature:
Private Declare Function IsDebuggerPresent Lib "kernel32" () As Integer
C# Signature:
[DllImport("kernel32.dll")]
static extern bool IsDebuggerPresent();
Boo Signature:
[DllImport("kernel32.dll", SetLastError : true)]
def IsDebuggerPresent() as bool:
pass
User-Defined Types:
None.
VB Usage:
Private Declare Function IsDebuggerPresent Lib "kernel32" () As Integer
Try
If IsDebuggerPresent = 1 Then
MsgBox("Debugger is present!") 'Debugger was detected
Else
MsgBox("Debugger isn't present!") Debugger was not detected
End If
Catch ex As Exception
MsgBox(ex.Message)
End Try
Notes:
This is a quick way to help protect your applications from being reverse engineered at runtime. Call this when your application starts and exit if it returns true.
Tips & Tricks:
Call this before your application starts to protect it from runtime analysis. This is a weak form of protection, and is trivially bypassed. For a more robust mechanism, use a .NET obfuscator tool.
Sample Code:
// debug checking in debug builds would make it impossible to debug in Visual Studio
#if !DEBUG
if (IsDebuggerPresent() == true) {
Application.Exit();
}
#endif
Alternative Managed API:
Do you know one? Please contribute it!
