Trace in VC

Trace macro is very useful for program debugging in VC and has functions similar to printf. This macro only appears in the debug version of the program, when release is enabled, the macro disappears completely, helping you reduce the amount of code during debugging.

The format is as follows:

Trace ("ddddddddddd ");

Trace ("Wewe % d", 333 );

There are also trace0, trace1, trace2... Corresponding to 0, 1, 2, respectively .. Parameters

Trace information is output to the output window of the vc ide environment (this window is the one that prompts an error in your compilation project), but it is limited to running your debug version program in VC.

Trace information can also be captured using debugview. In this case, you cannot run your program in the vc ide environment, but run the build debug version program separately, in this case, you can see the output in debugvie format in the debugview window.

There are four trace usage methods in VC:

1:

Trace, that is, the output string without dynamic parameters, similar to C's printf ("output string ");

2:

The string in the trace can contain a parameter output, similar to C's printf ("... % d", variable );

3:

Trace can contain two parameter outputs, similar to C's printf ("... % d... % F", variable 1, variable 2 );

4:

Trace can contain three parameter outputs, similar to C's printf ("... % d, % d, % d", variable 1, variable 2, variable 3 );

The trace macro is like the printf function we used in the C language before, so that the program outputs some debugging information during the running process, so that we can understand some of the program status. But the difference is:

The trace macro outputs only in the debugging status, and the printf function used previously has outputs in all circumstances. Like the printf function, the trace function can accept multiple parameters, for example:

Int x = 1;
Int y = 16;
Float z = 32.0;
Trace ("this is a trace statement/N ");
Trace ("the value of X is % d/N", X );
Trace ("x = % d and Y = % d/N", x, y );
Trace ("x = % d and Y = % X and Z = % F/N", x, y, z );

Note that the trace macro only works for the debug project. In the release project, the trace macro is ignored.