How to print file names, line numbers, and function names

Transferred from: http://blog.csdn.net/cabinriver/article/details/8960119

When tracking a piece of open source code today, because you are not familiar with the code, you need to print some key information. I just sort this out. A macro that can print the file name, line number, and function name.

1, print the file name, line number, function of two ways

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2. /**************************************************************************
4. * @Copyright (c), CHENMH, All rights reserved.
8. * @file: Main.cpp
10. * @version: Ver 1.0
14. * @author: CHENMH
16. * @date: 2013/05/22 14:07
18. * @brief: The method of printing the file name, line number, function name.
20. **************************************************************************/
22. #include <cstdio>
26. Define the print macro and include the file name, line number, and function name before printing the information
30. This macro expands, similar to printf ("123"), printf ("456");
32. #define TRACE_CMH_1 (printf ("%s (%d)-<%s>:", __file__, __line__, __function__), printf)
36. This macro expands, similar to printf ("%d" "%d", 1, 2);
38. #define TRACE_CMH_2 (FMT,...) \
40. printf ("%s (%d)-<%s>:" # #fmt, __file__, __line__, __function__, # #__VA_ARGS__)
44. Note: Because the first macro trace_cmh_1 called printf two times, efficiency does not have a second macro high.
46. If the compiler supports the C99 standard, you can use a second macro.
50. int count = 1;
54. Class CBase
56. {
58. Public
60. CBase ()
62. {
64. //Print the file, line number, function, and other information of the current line.
66. Trace_cmh_2 ("BASE: [%d]\n", count++);
68. }
70. };
74. Class Csub: Public CBase
76. {
78. Public
80. Csub ()
82. {
84. //Print the file, line number, function, and other information of the current line.
86. Trace_cmh_1 ("SUB: [%d]\n", count++);
88. }
90. };
94. int main (int argc, char **argv)
96. {
98. Csub Sub;
102. return 0;
104. }

2. Use in the project

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2. /********************************************************
4. * @author: CHENMH
6. * @date: 2013/05/24 10:11
8. * @brief: Define DEBUG Print Macros
10. ********************************************************/
12. #define _DEBUG_TRACE_CMH_ 2
14. #if 0! = _debug_trace_cmh_
16. #include <cstdio>
18. #endif
22. #if 1==_debug_trace_cmh_//Normal printing
24. #define TRACE_CMH printf
26. #elif 2==_debug_trace_cmh_//print file name, line number
28. #define TRACE_CMH (FMT,...) \
30. printf ("%s (%d):" # #fmt, __file__, __line__, # #__VA_ARGS__)
32. #elif 3==_debug_trace_cmh_//print file name, line number, function name
34. #define TRACE_CMH (FMT,...) \
36. printf ("%s (%d)-<%s>:" # #fmt, __file__, __line__, __function__, # #__VA_ARGS__)
38. #else
40. #define TRACE_CMH
42. #endif//_trace_cmh_debug_
44. /*******************************************************/

These are some of the macros used in this code:
1) __va_args__ is a variable parameter macro, this macro is new in the C99 specification, and now seems to support both GCC and VC6.0 (VC6.0 compiler does not support). The macro front Plus # #的作用在于, when the number of variable parameters is 0 o'clock, here the # #起到把前面多余的 "," remove the role.
2) __file__ macro will be replaced with the current source file name at precompilation
3) __LINE__ macro will be replaced with the current line number at precompilation
4) __FUNCTION__ macro will be replaced with the current function name at precompilation

Go from: http://blog.csdn.net/ly61baby/article/details/6777772 Print the name and number of lines of the current source file __file__, __line__2009-12-03 22:35

printf ("%s\nline%d:\n", __file__, __line__);

Prints the line number and source filename of the current statement in the source file.

#define DEBUG_MSG (printf ("%s[%d]:", __file__, __line__), printf)

Outputs debugging information at a line in the program.

__func__ get the current function name

How to print file names, line numbers, and function names