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Debugging Tools for Inspecting Your Program

The primary purpose of any debugger is to display information about the state of the program being debugged and, in some cases, to modify that state. The Visual Studio debugger provides a variety of tools for inspecting and modifying the state of your program. Most of these tools function only in break mode.

DataTips

One of the least obtrusive tools is the DataTips pop-up information box. When the debugger is in break mode, you can view the value of a variable within the current scope by placing the mouse pointer over the variable in a source window. A DataTips pop-up box appears. To view the value of an expression, select the expression. DataTips pop-up information is not available for expressions outside the current scope, invalid expressions (such as division by zero), or expressions that involve function evaluation. For more information, see Expressions in the Debugger.

Debugger Windows and Dialog Boxes

For more detailed inspection of your program, the Visual Studio debugger provides a variety of windows and dialog boxes.

You can set the numeric format used in the debugger windows to decimal or hexadecimal. For more information, see Changing the Numeric Format of Source Windows.

Try To view
Using the Autos Window
  • Variables in the current statement and previous statement
Using the Locals Window
  • Local variables
Using the This (Me) Window
  • Object associated with the current method (called this in C++ and C# or Me in Visual Basic)
Using the QuickWatch Dialog Box
  • Variables
  • Register contents
  • Any valid expression recognized by the debugger
Using the Watch Window
  • Variables
  • Register contents
  • Any valid expression recognized by the debugger
Using the Registers Window Register contents
Using the Memory Window Memory contents
Using the Call Stack Window
  • Names of functions on the call stack
  • Parameter types
  • Parameter values
Using the Disassembly Window Assembly code generated by the compiler for your program
Using the Threads Window Information on threads (sequential streams of execution) created by your program
Using the Modules Window Modules (DLLs and EXEs) used by your program
Running Documents Window A list of documents, script code, that are loaded into the current process.
Note   Your ability to inspect the program may be limited by whether the program was built with debug information, whether you have access to the program's source code, and whether the common language runtime JIT compiler is tracking debug information. If the Visual Studio debugger does not find debug information for your program, it reports "no matching symbolic information found". Debug information is generated by default when you build the debug configuration of your program. To aid in debugging system calls, you can install system debug symbols. For more information, see Installing System Debug Symbols.

See Also

Command Window | Using the Debugger | Command Window | Visual Studio Debugger Model

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