C++ 如何在非 MFC 项目中使用 TRACE 宏？
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How can I use the TRACE macro in non-MFC projects?
提问by jagttt
I want to use the TRACE() macro to get output in the debug window in Visual Studio 2005in a non-MFCC++ project, but which additional header or library is needed?
我想在非MFCC++ 项目中使用 TRACE() 宏在Visual Studio 2005的调试窗口中获取输出，但是需要哪些额外的头文件或库？
Is there a way of putting messages in the debug output window and how can I do that?
有没有办法在调试输出窗口中放置消息，我该怎么做？
回答by Ferruccio
Build your own.
建立你自己的。
trace.cpp:
跟踪.cpp：
#ifdef _DEBUG
bool _trace(TCHAR *format, ...)
{
TCHAR buffer[1000];
va_list argptr;
va_start(argptr, format);
wvsprintf(buffer, format, argptr);
va_end(argptr);
OutputDebugString(buffer);
return true;
}
#endif
trace.h:
跟踪.h：
#include <windows.h>
#ifdef _DEBUG
bool _trace(TCHAR *format, ...);
#define TRACE _trace
#else
#define TRACE false && _trace
#endif
then just #include "trace.h" and you're all set.
然后只需 #include "trace.h" 就可以了。
Disclaimer: I just copy/pasted this code from a personal project and took out some project specific stuff, but there's no reason it shouldn't work. ;-)
免责声明：我只是从个人项目中复制/粘贴了此代码并取出了一些特定于项目的内容，但没有理由它不起作用。;-)
回答by Ulf Lindback
If you use ATL you can try ATLTRACE.
如果您使用 ATL，您可以尝试 ATLTRACE。
TRACE is defined in afx.h as (at least in vs 2008):
TRACE 在 afx.h 中定义为（至少在 vs 2008 中）：
// extern ATL::CTrace TRACE;
#define TRACE ATLTRACE
And ATLTRACE can be found in atltrace.h
并且 ATLTRACE 可以在 atltrace.h 中找到
回答by Fredrik Jansson
You can try the DebugOutputString function. TRACE is only enabled in debug builds.
您可以尝试 DebugOutputString 函数。TRACE 仅在调试版本中启用。
回答by sarat
In my understanding wvsprintf has problem with formatting. Use _vsnprintf (or thcar version _vsntprintf ) instead
在我的理解 wvsprintf 有格式问题。使用 _vsnprintf （或 thcar 版本 _vsntprintf ）代替
回答by olibre
Thanks to these answers I have fixed my bug :-)
由于这些答案，我已经修复了我的错误 :-)
Here I share my TRACE macro in C++ based on ideas from Ferruccio and enthusiasticgeek.
在这里，我根据 Ferruccio 和热情极客的想法分享我在 C++ 中使用的 TRACE 宏。
#ifdef ENABLE_TRACE
# ifdef _MSC_VER
# include <windows.h>
# include <sstream>
# define TRACE(x) \
do { std::stringstream s; s << (x); \
OutputDebugString(s.str().c_str()); \
} while(0)
# else
# include <iostream>
# define TRACE(x) std::clog << (x)
# endif // or std::cerr << (x) << std::flush
#else
# define TRACE(x)
#endif
example:
例子：
#define ENABLE_TRACE //can depend on _DEBUG or NDEBUG macros
#include "my_above_trace_header.h"
int main (void)
{
int v1 = 123;
double v2 = 456.789;
TRACE ("main() v1="<< v1 <<" v2="<< v2 <<'\n');
}
Any improvements/suggestions/contributions are welcome ;-)
欢迎任何改进/建议/贡献;-)
