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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

The Debug Class (C++/CLI)

When using Debug in a Visual C++ application, the behavior does not change between a debug and a release build.

The behavior for Trace is identical to the behavior for the Debug class, but is dependent on the symbol TRACE being defined. This means that you must #ifdef any Trace-related code to prevent debug behavior in a release build.

Description

The following sample always executes the output statements, regardless of whether you compile with /DDEBUG or /DTRACE.

Code

// mcpp_debug_class.cpp
// compile with: /clr
#using <system.dll>
using namespace System::Diagnostics;
using namespace System;

int main() {
   Trace::Listeners->Add( gcnew TextWriterTraceListener( Console::Out ) );
   Trace::AutoFlush = true;
   Trace::Indent();
   Trace::WriteLine( "Entering Main" );
   Console::WriteLine( "Hello World." );
   Trace::WriteLine( "Exiting Main" );
   Trace::Unindent();

   Debug::WriteLine("test");
}

Output

    Entering Main
Hello World.
    Exiting Main
test

Description

To get the expected behavior (that is, no "test" output printed for a release build), you must use the #ifdef and #endif directives. The previous code sample is modified below to demonstrate this fix:

Code

// mcpp_debug_class2.cpp
// compile with: /clr
#using <system.dll>
using namespace System::Diagnostics;
using namespace System;

int main() {
   Trace::Listeners->Add( gcnew TextWriterTraceListener( Console::Out ) );
   Trace::AutoFlush = true;
   Trace::Indent();

#ifdef TRACE   // checks for a debug build
   Trace::WriteLine( "Entering Main" );
   Console::WriteLine( "Hello World." );
   Trace::WriteLine( "Exiting Main" );
#endif
   Trace::Unindent();

#ifdef DEBUG   // checks for a debug build
   Debug::WriteLine("test");
#endif   //ends the conditional block
}

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