将lptstr转换为char*

Question

有人知道如何在C++中将类型LPTSTR转换为char *吗？

Answer 1

取决于它是否显示为Unicode。如果不是Unicode，则LPTSTR为char*；如果是，则为w_char*。

Discussed better here (值得阅读的接受答案)

Answer 2

这里有很多方法可以做到这一点。MFC或ATL的CString、ATL宏或Win32 API。

LPTSTR szString = _T("Testing");
char* pBuffer;

可以使用ATL宏来转换：

USES_CONVERSION;
pBuffer = T2A(szString);

CString：

CStringA cstrText(szString);

或Win32接口WideCharToMultiByte (如果定义了UNICODE )。

Answer 3

如果您的编译器字符设置设置为Unicode字符集，则LPTSTR将被解释为wchar_t*。在这种情况下，需要将Unicode字符转换为多字节字符。

(在Visual Studio中，设置位于项目属性\配置属性\常规\字符集)

下面的示例代码应该给出一个概念：

#include <windows.h>

/* string consisting of several Asian characters */
LPTSTR wcsString = L"\u9580\u961c\u9640\u963f\u963b\u9644";
//LPTSTR wcsString = L"OnlyAsciiCharacters";

char* encode(const wchar_t* wstr, unsigned int codePage)
{
    int sizeNeeded = WideCharToMultiByte(codePage, 0, wstr, -1, NULL, 0, NULL, NULL);
    char* encodedStr = new char[sizeNeeded];
    WideCharToMultiByte(codePage, 0, wstr, -1, encodedStr, sizeNeeded, NULL, NULL);
    return encodedStr;
}

wchar_t* decode(const char* encodedStr, unsigned int codePage)
{
   int sizeNeeded = MultiByteToWideChar(codePage, 0, encodedStr, -1, NULL, 0);
   wchar_t* decodedStr = new wchar_t[sizeNeeded ];
   MultiByteToWideChar(codePage, 0, encodedStr, -1, decodedStr, sizeNeeded );
   return decodedStr;
}

int main(int argc, char* argv[])
{
   char* str = encode(wcsString, CP_UTF8); //UTF-8 encoding
   wchar_t* wstr = decode(str, CP_UTF8);
   //If the wcsString is UTF-8 encodable, then this comparison will result to true.
   //(As i remember some of the Chinese dialects cannot be UTF-8 encoded 
   bool ok = memcmp(wstr, wcsString, sizeof(wchar_t) * wcslen(wcsString)) == 0; 
   delete str;
   delete wstr;

   str = encode(wcsString, 20127); //US-ASCII (7-bit) encoding
   wstr = decode(str, 20127);
   //If there were non-ascii characters existing on wcsString, 
   //we cannot return back, since some of the data is lost
   ok = memcmp(wstr, wcsString, sizeof(wchar_t) * wcslen(wcsString)) == 0; 
   delete str;
   delete wstr;
}

另一方面，如果您的编译器字符设置设置为多字节，那么LPTSTR将被解释为char*。

在这种情况下：

LPTSTR x = "test";
char* y;
y = x;

另请参阅：

关于wchar_t转换的另一个讨论：How do you properly use WideCharToMultiByte

MSDN文章：http://msdn.microsoft.com/en-us/library/dd374130(v=vs.85).aspx

有效代码页标识符：http://msdn.microsoft.com/en-us/library/dd317756(v=vs.85).aspx