Pre-compiled commands and related macro Summary

// ================================================ ========================================

// Title:

// Pre-compiled commands and related macro Summary

// Author:

// Norains

// Date:

// Saturday 10-December-2007

// Environment:

// Evc4.0 + Windows CE 5.0 standard SDK

// ================================================ ========================================

1. Pre-compiled commands

01 )#

Empty command, no effect

02) # include

ContainsSource codeFile

03) # define

Definition macro

04) # UNDEF

Cancel a defined macro

05) # If

If the given condition is true, compile the followingCode

06) # else

Compile as remaining options for other preprocessing

07) # ifdef

If the macro has been defined, compile the following code:

08) # ifndef

If the macro is not defined, compile the following code:

09) # Elif

If the previous # If condition is not true and the current condition is true, compile the following code:

10) # endif

End one # If ...... # Else Conditional compilation Block

11) # Line

Change the number of current lines and file name

12) # pragma

For CompilationProgramProvides unconventional control flow information

13) # error

Stop compilation and Display error messages

2. compiler-related macros

Only some related macros are listed in this article. To view the complete macro list, refer to the "predefined macros" section of msdn.

01) _ msc_ver

Microsoft compiler version macro.

The following table lists the values of compilers of each version:

Compiler _ msc_ver Value

-------------------------------------------

C compiler version 6.0 600

C/C ++ compiler version 7.0 700

Visual c ++, windows, version 1.0 800

Visual c ++, 32-bit, version 1.0 800

Visual c ++, windows, version 2.0 900

Visual c ++, 32-bit, version 2.x 900

Visual c ++, 32-bit, version 4.0 1000

Visual c ++, 32-bit, version 5.0 1100

Visual c ++, 32-bit, version 6.0 1200

Visual c ++, 32-bit, version 2002 1300

Visual c ++, 32-bit, Version 2003 1310

Visual c ++, 32-bit, Version 2005 1400

Embedded Visual C ++, 32-bit, version 4.0 cross 1200-1202

02) _ mfc_ver

MFC version macro.

Version _ mfc_ver Value

-------------------------------

4.21 0x0421

6.0 0x0600

7.0 0x0700

03) _ time __

The time when the current source file is compiled, in the format of "HH: mm: SS.

04) _ date __

Compile the date of the current source file, in the format of "Mmm dd YYYY.

05) _ file __

The name of the current source file to be compiled.

3. instance description

01) determine the current compiling environment based on the value of _ mfc_ver.

# If _ msc_ver> = 1400

// This is Visual C ++ 2005

# Elif _ msc_ver> = 1310

// This is Visual C ++. NET 2003

# Elif _ msc_ver> 1300

// This is Visual C ++. NET 2002

# Endif

02) # nuances between else if and # Elif

# If _ msc_ver <1202

// EVC 4.0 complier is cross 1200-1202

# Else if _ msc_ver> = 1400

// Visual c ++ 2005 complier is 1400

# Else

// Visual c ++ 2005 complier is 1400

# Endif

This pre-compiled code will cause an error in evc4.0 and Visual Studio 2005 compilation, and the error message is "unexpected # else". In this case, you only need to replace "# else if" with "# Elif:

# If _ msc_ver <1202

// EVC 4.0 complier is cross 1200-1202

# Elif _ msc_ver> = 1400

// Visual c ++ 2005 complier is 1400

# Else

// Visual c ++ 2005 complier is 1400

# Endif

The above code can be compiled successfully.

03) a header file containing the parent directory

If the current file needs to contain a header file in the upper-level directory, you can use the ".. \" format, for example:

# Include ".. \ Configure. H"

It can even be located in the upper-level directory through recurrence:

# Include ".. \ Configure. H"

04) include the header file under a folder in the current directory

If the current file needs to contain a header file in a folder in the current directory, it can be in the form of ". \", for example:

# Include ". \ include \ Configure. H"

05) determine the current CPU type

# Ifdef _ x86 _

// X86

# Endif

# Ifdef _ MIPS _

// MIPS

# Endif

# Ifdef _ arm _

// Arm

# Endif

06) manually add the Lib Library to the code

# Pragma comment (Lib, ".. \ engine. lib ")