CString:
當VS編碼環境爲Unicode時,CString就是CStringW。當VS編碼環境爲多字節時,CString就是CStringA。
在C/C++中同樣存在着兩種環境的字符串:char 和 wchar_t。
本文的目的是:轉換他們。
Code Start :
class UStrToAscChar //CStringW + wchar_t* -> char*
{
public:
UStrToAscChar(const CStringW cs)
{
int n = WideCharToMultiByte(CP_ACP,0,cs,-1,NULL,0,NULL,NULL);
if(n <= 0)
buff = NULL;
buff = new char[n];
memset(buff,0,n);
WideCharToMultiByte(CP_ACP,0,cs,-1,buff,n,NULL,NULL);
}
~UStrToAscChar()
{
delete buff;
}
const char* operator &() //注意這是成員函數重載了運算符,友元函數重載需要參數
{
return buff;
}
private:
char* buff;
};
class UStrToWChar //CStringW ->wchar_t*
{
public:
UStrToWChar(const CStringW cs)
{
int n = cs.GetLength();
if(n <= 0)
buff = NULL;
buff = new wchar_t[n + 1];
wmemset(buff,0,n + 1);
for(int i = 0; i < n; i++)
buff[i] = cs[i];
}
~UStrToWChar()
{
delete buff;
}
const wchar_t* operator &()
{
return buff;
}
private:
wchar_t* buff;
};
class AStrToAscChar //CStringA -> char*
{
public:
AStrToAscChar(const CStringA cs)
{
int n = cs.GetLength();
if(n <= 0)
buff = NULL;
buff = new char[n + 1];
memset(buff,0,n + 1);
for(int i = 0; i < n; i++)
buff[i] = cs[i];
}
~AStrToAscChar()
{
delete buff;
}
const char* operator &()
{
return buff;
}
private:
char* buff;
};
class AscCharToWChar //char* -> wchar_t*
{
public:
AscCharToWChar(const char* ac)
{
if(ac == NULL || strlen(ac) <= 0)
buff = NULL;
int n = MultiByteToWideChar(CP_ACP,0,ac,-1,NULL,0);
buff = new wchar_t[n];
wmemset(buff,0,n);
MultiByteToWideChar(CP_ACP,0,ac,-1,buff,n);
}
~AscCharToWChar()
{
delete buff;
}
const wchar_t* operator &()
{
return buff;
}
private:
wchar_t* buff;
};
Unicode和多字節之間的轉換是通過WIN API完成的。
Unicode和Unicode之間、以及多字節和多字節之間,是通過字符拷貝完成的。
使用方法:
CStringW cs = L"中文English";
UStrToAscChar us(cs);
printf_s("%s \n",&us); //在控制檯輸出字符串
關於如何在MFC程序中打開控制檯:
class Console
{
public:
Console()
{
AllocConsole();
freopen_s(&fp,"conout$","w",stdout); //打開控制檯
setlocale(LC_ALL,"chs");
}
private:
FILE *fp;
};
只要添加一個變量即可:Console sole;