| title |
message | Microsoft Docs |
| ms.custom |
|
| ms.date |
11/04/2016 |
| ms.technology |
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| ms.topic |
reference |
| f1_keywords |
message_CPP |
vc-pragma.message |
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| dev_langs |
|
| helpviewer_keywords |
message pragma |
pragmas, message |
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| ms.assetid |
67414f25-ed47-4079-a5dc-21d9d1a39754 |
| author |
corob-msft |
| ms.author |
corob |
| ms.workload |
|
Sends a string literal to the standard output without terminating the compilation.
#pragma message( messagestring )
Remarks
A typical use of the message pragma is to display informational messages at compile time.
The messagestring parameter can be a macro that expands to a string literal, and you can concatenate such macros with string literals in any combination.
If you use a predefined macro in the message pragma, the macro should return a string, else you will have to convert the output of the macro to a string.
The following code fragment uses the message pragma to display messages during compilation:
// pragma_directives_message1.cpp
// compile with: /LD
#if _M_IX86 >= 500
#pragma message("_M_IX86 >= 500")
#endif
#pragma message("")
#pragma message( "Compiling " __FILE__ )
#pragma message( "Last modified on " __TIMESTAMP__ )
#pragma message("")
// with line number
#define STRING2(x) #x
#define STRING(x) STRING2(x)
#pragma message (__FILE__ "[" STRING(__LINE__) "]: test")
#pragma message("") Pragma Directives and the __Pragma Keyword