如何将CString传递到格式字符串％s？

本文介绍了如何将CString传递到格式字符串％s？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 class MyString{public: MyString(const std::wstring& s2) { s = s2; } operator LPCWSTR() const { return s.c_str(); }private: std::wstring s;};int _tmain(int argc, _TCHAR* argv[]){ MyString s = L"MyString"; CStringW cstring = L"CString"; wprintf(L"%s\n", (LPCWSTR)cstring); // Okay. Becase it has an operator LPCWSTR() wprintf(L"%s\n", cstring); // Okay, fine. But how? wprintf(L"%s\n", (LPCWSTR)s); // Okay. fine. wprintf(L"%s\n", s); // Doesn't work. Why? It prints gabage string like "?." return 0;} CString如何传递到格式字符串％s？How can CString be passed to format string %s?顺便说一句， MSDN说（很奇怪）By the way, MSDN says(it's weird) 在变量参数函数中使用CString对象 将CString显式转换为一个LPCTSTR字符串，如下所示： To use a CString object in a variable argument function Explicitly cast the CString to an LPCTSTR string, as shown here: CString kindOfFruit = "bananas";int howmany = 25;printf( "You have %d %s\n", howmany, (LPCTSTR)kindOfFruit ); 推荐答案 CString是专门设计的，指向缓冲区类中的字符串数据。它通过值传递给printf，然后在格式字符串中看到％s时将其视为一个指针。CString is specifically designed such that it only contains a pointer that points to the string data in a buffer class. It is passed by value to printf which then treats it as a pointer when seeing the "%s" in the format string.它最初只是使用printf机会，但这后来一直保持作为类接口的一部分。It originally just happened to work with printf by chance, but this has later been kept as part of the class interface. 这篇关于如何将CString传递到格式字符串％s？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！