C++ 将 CString 转换为 const char*
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Convert CString to const char*
提问by Attilah
How do I convert from CStringto const char*in my Unicode MFC application?
如何在我的 Unicode MFC 应用程序中转换CString为const char*？
回答by Rob
To convert a TCHARCString to ASCII, use the CT2Amacro - this will also allow you to convert the string to UTF8 (or any other Windows code page):
要将TCHARCString转换为 ASCII，请使用CT2A宏 - 这也将允许您将字符串转换为 UTF8（或任何其他 Windows 代码页）：
// Convert using the local code page
CString str(_T("Hello, world!"));
CT2A ascii(str);
TRACE(_T("ASCII: %S\n"), ascii.m_psz);
// Convert to UTF8
CString str(_T("Some Unicode goodness"));
CT2A ascii(str, CP_UTF8);
TRACE(_T("UTF8: %S\n"), ascii.m_psz);
// Convert to Thai code page
CString str(_T("Some Thai text"));
CT2A ascii(str, 874);
TRACE(_T("Thai: %S\n"), ascii.m_psz);
There is also a macro to convert from ASCII -> Unicode (CA2T) and you can use these in ATL/WTL apps as long as you have VS2003 or greater.
还有一个宏可以从 ASCII -> Unicode ( CA2T)转换，只要你有 VS2003 或更高版本，你就可以在 ATL/WTL 应用程序中使用这些。
See the MSDNfor more info.
有关更多信息，请参阅MSDN。
回答by Mark Ransom
If your CString is Unicode, you'll need to do a conversion to multi-byte characters. Fortunately there is a version of CString which will do this automatically.
如果您的 CString 是 Unicode，您将需要转换为多字节字符。幸运的是，有一个 CString 版本可以自动执行此操作。
CString unicodestr = _T("Testing");
CStringA charstr(unicodestr);
DoMyStuff((const char *) charstr);
回答by RichieHindle
Note: This answer predates the Unicode requirement; see the comments.
注意：此答案早于 Unicode 要求；见评论。
Just cast it:
只需投射它：
CString s;
const TCHAR* x = (LPCTSTR) s;
It works because CString has a cast operator to do exactly this.
它之所以有效，是因为 CString 有一个强制转换运算符可以做到这一点。
Using TCHAR makes your code Unicode-independent; if you're not concerned about Unicode you can simply use charinstead of TCHAR.
使用 TCHAR 使您的代码独立于 Unicode；如果你不关心Unicode的你可以简单地使用char代替TCHAR。
回答by Reed Copsey
There is an explicit cast on CString to LPCTSTR, so you can do (provided unicode is not specified):
有一个 CString 到 LPCTSTR 的显式转换，所以你可以这样做（如果未指定 unicode）：
CString str;
// ....
const char* cstr = (LPCTSTR)str;
回答by Mr.What
I had a similar problem. I had a char*buffer with the .so name in it.
I could not convert the char*variable to LPCTSTR. Here's how I got around it...
我有一个类似的问题。我有一个char*带有 .so 名称的缓冲区。
我无法将char*变量转换为LPCTSTR. 这就是我解决它的方法...
char *fNam;
...
LPCSTR nam = fNam;
dll = LoadLibraryA(nam);
回答by felixjimcal
I recommendo to you use TtoC from ConvUnicode.h
我建议你使用 ConvUnicode.h 中的 TtoC
const CString word= "hello";
const char* myFile = TtoC(path.GetString());
It is a macro to do conversions per Unicode
这是一个按 Unicode 进行转换的宏
回答by Amit G.
Generic Conversion Macros (TN059 Other Considerations section is important):
通用转换宏（TN059 其他注意事项部分很重要）：
A2CW (LPCSTR) -> (LPCWSTR)
A2W (LPCSTR) -> (LPWSTR)
W2CA (LPCWSTR) -> (LPCSTR)
W2A (LPCWSTR) -> (LPSTR)
