标头正确，但找不到标识符

Question

我有两个项目(x64)。

A.用C (wxWidgets)写的--编辑:用C++写的！

B。用C++写的

A编译得很好，但是B (它使用A的函数)在我试图编译时会出现几个错误。

我认为错误的原因对所有人都是一样的，所以我只提到第一个。上面写着：

strlen: identifier not found

在提供错误消息的文件( wxcrtbase.h )中，包含以下标题：

#include <stdio.h>
#include <string.h>`

来自B的文件包括来自A的下列标头

#include "wx/wx.h"
#include "wx/dcbuffer.h" 
#include "wx/spinctrl.h"

所以，目前，我不知道从哪里开始寻找错误的原因。可能是我有C和C++文件吗？也许是我为x64编写的？

谢谢你帮忙！

编辑:更多信息

在wxcrtbase.h中，生成第一个错误消息的行是：

#ifdef __cplusplus  
inline size_t wxStrlen(const char *s) { return s ? wxCRT_StrlenA(s) : 0; }  
inline size_t wxStrlen(const wchar_t *s) { return s ? wcslen(s) : 0; }  

包含wxcrtbase.h的顺序是

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <wctype.h>
#include <time.h>
#include <io.h>

/showIncludes列出了以下内容(我在前两条错误消息之后停止使用该列表)：

1>Compiling...
1>widget.cpp
1>Note: including file: m:\visual studio 2008\projects\general\rama\src\widget.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include \string
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\istream
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\ostream
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\ios
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\xlocnum
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\climits
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\yvals.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\sal.h
1>Note: including file: c:\program files (x86)\microsoft visual studio 9.0\vc\include\codeanalysis\sourceannotations.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtassem.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\vadefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\use_ansi.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\limits.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\cstdio
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\stdio.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\swprintf.inl
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\cstdlib
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\stdlib.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\streambuf
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\xiosbase
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\xlocale
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\cstring
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx\string.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/defs.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/platform.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\setupp.h
1>Note: including file: m:\visual studio 2008\projects\general\wxwidgets-2.9.0\include\wx/version.h
1>Note: including file: m:\visual studio 2008\projects\general\wxwidgets-2.9.0\include\wx/cpp.h
1>Note: including file: m:\visual studio 2008\projects\general\wxwidgets-2.9.0\include\wx/cpp.h
1>Note: including file: M:/Visual Studio 2008/Projects/general/wxWidgets-2.9.0/lib/vc_lib/mswud/wx/setup.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/msw/libraries.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/chkconf.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/msw/chkconf.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/version.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/dlimpexp.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\stddef.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/debug.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\assert.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file:  M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/chartype.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/platform.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\tchar.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\wchar.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\wtime.inl
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/cpp.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/windowid.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/msw/winundef.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/features.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx\string.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\stdarg.h
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/wxcrtbase.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\io.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file:  C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\cctype
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\ctype.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\cwctype
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\wctype.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\ctime
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\time.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\crtdefs.h
1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\time.inl
1>Note: including file:  M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/chartype.h
1>M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/wxcrtbase.h(705) : error C3861: 'strlen': identifier not found
1>M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx/wxcrtbase.h(718) : error C3861: '_strdup': identifier not found

Answer 1

有几件事需要尝试和/或回答：

• 您能发布至少几行代码，包括编译器生成的“标识符未找到”错误的行吗?当您说您有一个#include <string.h>行时，具体是哪个文件，以及它是否在各种wx包含之前？
• ，当您使用/showIncludes选项构建时，能发布包含的标题的输出(它位于VS 2008 IDE的C++项目属性页面中的“C/C++/高级/显示包含”下)？

F 210

编辑，并提供新信息：

基于您所做的编辑，其中包含了来自/showIncludes的更完整的列表，您可能不正确地设置了包含路径集。下面是日志中的几行代码：

1>Note: including file: C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\cstring
1>Note: including file: M:\Visual Studio 2008\Projects\general\wxWidgets-2.9.0\include\wx\string.h

当MSVC的cstring报头试图包含string.h时，它从wx库中获取一个string.h头，而不是编译器发行版(将在C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\string.h中)的一部分。

我不知道为什么wx库会命名它们自己的标题string.h (而不是wxString.h)，但我假设它是由使用以下内容的人获取的：

#include "wx/string.h"

无论如何，我认为您将通过确保MSVC包含目录位于任何其他目录之前的包含搜索路径中来解决您的问题。

Answer 2

如果wxWidgets是C++，并且它包含和编译器阻止包含以及何时包含cstring/cstdio，那么strlen将位于std名称空间中而不是全局的。试试std::strlen，看看它是否修复了错误。

Answer 3

尝试#include<cstdio>和#include<cstring>，它们是C++的头