如何转换/(投射)我的“字符串"；下面的C ++示例中将值转换为字符? [英] How can I convert/(cast) my "string" values to characters in the following C++ example?

问题描述

#using <System.dll>
using namespace System;

int main()
{
	//Two arrays: __wchar_t and String
	array<__wchar_t^>^ chararray3 = gcnew array<__wchar_t^>(5);
	array<String^>^ strarray = gcnew array<String^>(5);
	//values into arrays
	chararray3[0] = L'\u2550';
	chararray3[1] = L'\u2551';
	chararray3[2] = L'\u2552';
	chararray3[3] = L'\u2553';
	chararray3[4] = L'\u2554';
	// note: that compiler generates warning C4566 when generating next array "cannot be represented in current code page (1252)"
	strarray[0] = "\u2550";
	strarray[1] = "\u2551";
	strarray[2] = "\u2552";
	strarray[3] = "\u2553";
	strarray[4] = "\u2554";
	int cp;
	// __wchar_t array contents to console ...
	for(cp=0;cp<5;cp++)
	{
		Console::WriteLine(chararray3[cp]);
	}
	Console::WriteLine(" ");					// space
	// String array contents to console ... expected result with subbstitution character "?" due to code-page-error/other
	for(cp=0;cp<5;cp++)
	{
		Console::WriteLine(strarray[cp]);
	}
	// Question is: why isn't THIS gonna happen ...  ????
	for(cp=0;cp<5;cp++)
	{
		Console::WriteLine((__wchar_t) strarray[cp]); // error C2440 'type cast' : cannot connvert from 'System::String^' to 'wchar_t' !!!
	}
	/* wth ... converting on the fly! 
	
		Why not! It's a string but it's also a literal unicode value identical to the ones 
		contained in the array of __wchar_t that expands to console value without complaint in the above!?
	*/
	return 0;
}

推荐答案

首先，应将c ++更改为cp ++

To begin with you should change c++ into cp++

for(cp=0;cp<5;cp++)

至于演员，怎么样:

As for the casting, how about:

for(cp=0;cp<5;cp++)
{
    Console::WriteLine((System::String ^)strarray[cp]); // error C2440 'type cast' : cannot connvert from 'System::String^' to 'wchar_t' !!!
}

您不能将string强制转换为char.仅仅因为您的字符串中只有一个字符并不能使它成为字符常量，所以它仍然是一个字符串，但其中只有一个字符.

You cannot cast a string to a char. Just because you have a single character in your string does not make it into a character constant, it remains a string but with only one character in it.

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