通过下面的例子，可以到到 VC 可以在运行过程中输出当前运行的文件和所处的行数以及所在函数名称。如果需要追踪你程序的流程，并且能够获得运行期的Log文件，这将是一个很好的追踪方法
#include "stdafx.h"
void foo()
{
printf("Run in file %s, line %d Function %s\n", __FILE__, __LINE__, __FUNCDNAME__);
return;
}
int _tmain(int argc, _TCHAR* argv[])
{
printf("This is a simple demo to show how to show Filename Line Number and Function Name \n");
printf(" Powered by www.lab-z.com Z.t \n");
printf("Run in file %s, line %d Function %s\n", __FILE__, __LINE__, __FUNCDNAME__);
foo();
getchar();
return 0;
}
运行结果：
注意到其中的文件名给出的是相对路径，可以通过下面的位置设置为完整路径
之后的运行结果
其中使用的 __FILE__ 和 __LINE__ 是c语言标准中定义的
下面文字来源于 http://topic.okbase.net/200510/2005102110/2170344.html
看ISO14882
6.10.8 Predefined macro names
1 The following macro names148) shall be defined by the implementation:
_ _DATE_ _ The date of translation of the preprocessing translation unit: a character
string literal of the form "Mmm dd yyyy", where the names of the
months are the same as those generated by the asctime function, and the
first character of dd is a space character if the value is less than 10. If the
date of translation is not available, an implementation-defined valid date
shall be supplied.
_ _FILE_ _ The presumed name of the current source file (a character string literal).149)
_ _LINE_ _ The presumed line number (within the current source file) of the current
source line (an integer constant).149)
_ _STDC_ _ The integer constant 1, intended to indicate a conforming implementation.
_ _STDC_HOSTED_ _ The integer constant 1 if the implementation is a hosted
implementation or the integer constant 0 if it is not.
_ _STDC_VERSION_ _ The integer constant 199901L.150)
_ _TIME_ _ The time of translation of the preprocessing translation unit: a character
string literal of the form "hh:mm:ss" as in the time generated by the
asctime function. If the time of translation is not available, an
implementation-defined valid time shall be supplied.
2 The following macro names are conditionally defined by the implementation:
_ _STDC_IEC_559_ _ The integer constant 1, intended to indicate conformance to the
specifications in annex F (IEC 60559 floating-point arithmetic).
148) See ‘‘future language directions’’ (6.11.9).
149) The presumed source file name and line number can be changed by the #line directive.
150) This macro was not specified in ISO/IEC 9899:1990 and was specified as 199409L in
ISO/IEC 9899/AMD1:1995. The intention is that this will remain an integer constant of type long
int that is increased with each revision of this International Standard.
160 Language §6.10.8
©ISO/IEC ISO/IEC 9899:1999 (E)
_ _STDC_IEC_559_COMPLEX_ _ The integer constant 1, intended to indicate
adherence to the specifications in informative annex G (IEC 60559
compatible complex arithmetic).
_ _STDC_ISO_10646_ _ An integer constant of the form yyyymmL (for example,
199712L), intended to indicate that values of type wchar_t are the
coded representations of the characters defined by ISO/IEC 10646, along
with all amendments and technical corrigenda as of the specified year and
month.
3 The values of the predefined macros (except for _ _FILE_ _ and _ _LINE_ _) remain
constant throughout the translation unit.
4 None of these macro names, nor the identifier defined, shall be the subject of a
#define or a #undef preprocessing directive. Any other predefined macro names
shall begin with a leading underscore followed by an uppercase letter or a second
underscore.
5 The implementation shall not predefine the macro _ _cplusplus, nor shall it define it
in any standard header.
Forward references: the asctime function (7.23.3.1), standard headers (7.1.2).
__FUNCDNAME__ 是 VC 自定义的
介绍在 http://msdn.microsoft.com/en-us/library/b0084kay(VS.71).aspx
__FUNCDNAME__ Valid only within a function and returns the decorated name of the enclosing
function (as a string). __FUNCDNAME__ is not expanded if you use the /EP or /P compiler option.