Visual C++奇怪的编译器错误

Question

我想使用XOR方法制作加密器/解密器。我已经在Console C++中完成了这个工作，并且我是VC++的新手，所以我希望你能帮助我。 加密的工作原理是这样的：

key = 3 
x = 5 // The item being encrypted 

encryptedx = x^key // the "^" is XOR 

所以，现在，我希望把它在VC++，使这更好​​看的控制台窗口。 在VC++的设计视图中，我有两个富文本框，编辑框和一些按钮来启动过程。 这听起来很容易，但是我得到这些错误：

------ Build started: Project: Encryptor, Configuration: Debug Win32 ------ 
1> Encryptor.cpp 
1>c:\users\**********c*********ncryptor\encryptor\Form1.h(264): error C2679: binary '=' : no operator found which takes a right-hand operand of type 'System::String ^' (or there is no acceptable conversion) 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(707): could be 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(std::basic_string<_Elem,_Traits,_Ax> &&)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(762): or  'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(const std::basic_string<_Elem,_Traits,_Ax> &)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(767): or  'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(const _Elem *)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(772): or  'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(_Elem)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   while trying to match the argument list '(std::string, System::String ^)' 
1>c:\*******gl\*****cryptor\encryptor\Form1.h(281): error C2679: binary '=' : no operator found which takes a right-hand operand of type 'System::String ^' (or there is no acceptable conversion) 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(707): could be 'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(std::basic_string<_Elem,_Traits,_Ax> &&)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(762): or  'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(const std::basic_string<_Elem,_Traits,_Ax> &)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(767): or  'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(const _Elem *)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\include\xstring(772): or  'std::basic_string<_Elem,_Traits,_Ax> &std::basic_string<_Elem,_Traits,_Ax>::operator =(_Elem)' 
1>   with 
1>   [ 
1>    _Elem=char, 
1>    _Traits=std::char_traits<char>, 
1>    _Ax=std::allocator<char> 
1>   ] 
1>   while trying to match the argument list '(std::string, System::String ^)' 
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== 

这里是代码：

#include <string> 
#include "crypFunc.cpp" 

int key = 0; 
char tempChar; 
int stringLenght = 0; 
string strBuffer = ""; 
using namespace std; 

// 
// 
// 
// 
// 



    private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) 
      { 
       if(KeyBox->Text) 
       { 
       key =Convert::ToInt32(KeyBox->Text); 
       numericUpDown1->Value = key; 
       } 


      } 
// 
// 
// 
// 




private: System::Void EncryptButton_Click(System::Object^ sender, System::EventArgs^ e) 
     { 

      EncryptedBox->Text = ""; 

      strBuffer = DecryptedBox->Text; 
      stringLenght = strBuffer.size(); 
      if(strBuffer.size() && key) 
      { 
      for(int i = 0; i < stringLenght; i++) 
      { 
       tempChar = encrypt(strBuffer[i], key); 
       EncryptedBox->Text = EncryptedBox->Text + tempChar; 
      } 
      } 

     } 


private: System::Void DecryptButton_Click(System::Object^ sender, System::EventArgs^ e) 
     { 
      DecryptedBox->Text = ""; 
      strBuffer = Convert::ToString(EncryptedBox->Text); 
      stringLenght = strBuffer.size(); 
      if(strBuffer.size() && key) 
      { 
       for(int i = 0; i < stringLenght; i++) 
       { 
        tempChar = decrypt(strBuffer[i], key); 
        DecryptedBox->Text = DecryptedBox->Text + tempChar; 
       } 
      } 
     } 
}; 
} 

我真的希望你们中的一些可以和想帮助我。

Answer 1

它看起来像你试图分配一个托管System :: String ^对象到一个std :: string。您将需要系统::字符串先转换：

http://msdn.microsoft.com/en-us/library/1b4az623(v=vs.80).aspx

而且，只是要注意，这不仅仅是标准的“VC++”。你的代码是C++/CLI（如果这就是你正在做的事情，这可能没问题）。

希望这会有所帮助。

Answer 2

好吧，我已经回家了，并尝试了一些东西给你。

我有这个代码在我的机器上工作没有问题。汇总一个关于如何将std :: string转换为system :: String ^，以及从system :: string ^转换为std :: string的小演示。

阅读时，它似乎并不是从std :: string到system :: string ^的最佳主意。如果你喜欢，你可以阅读它。

您还需要将通用语言运行时支持设置为/ clr。祝你好运，希望这能帮到你！

#include <string> 
#include <iostream> 
#include <msclr\marshal.h> 
#include <msclr\marshal_cppstd.h> // you will only need one of these 

using namespace std; 
using namespace System; 
using namespace msclr::interop; 

int main() { 
    //define our std::string 
    string standardString = "Test String to Marshal"; 
    cout << "String before conversions: " << standardString<<endl; 

    // convert std::string to system::string^ using marshalling 
    String^ sysStringFromStandardString; 
    sysStringFromStandardString = marshal_as<String^>(standardString); 

    // convert system::string^ to std::string 
    string backToStdString; 
    backToStdString = marshal_as<string>(sysStringFromStandardString); 

    cout<< "String after converstion: "<<backToStdString<<endl; 

    return 0; 
} 

Answer 3

对于VS2008及更新版本，您可以使用marshal_as。否则，请参阅@ Scott的答案。

#include <msclr/marshal_cppstd.h> 

String^ foo = ""; 
std::string bar = marshal_as<std::string>(foo);