char 与 wchar_t 之间的转换
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| #include <iostream>
#include <iomanip>
int main(void)
{
char c = 'a';
std::cout << c << std::endl;
//char -> wchar_t
wchar_t wc = (wchar_t)c;
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << wc << std::endl;
//wchar_t -> char
char c_ = (char)wc;
std::cout << c_ << std::endl;
system("pause");
return 0;
}
|
输出：
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| a
U+0061
a
请按任意键继续. . .
|
Unicode编码表：A-Z,a-z,0-9的unicode编码表
string 与 wstring 之间的转换
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| #include <iostream>
#include <string>
#include <iomanip>
int main(void)
{
std::string str = "HelloWorld";
std::cout << str << std::endl;
//string -> wstring
std::wstring wstr;
wstr.assign(str.begin(), str.end());
// std::cout << wstr.c_str() << std::endl; //error 这样是打印不出来的
//std::cout << wstr.c_str() << std::endl; //error 编译不报错，但是它打印的是wstr第一个字符的地址
//打印 success
std::cout << "Unicode is ";
for(int i=0; i<wstr.length(); i++){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << wstr[i] << " ";
}
std::cout << std::endl;
//打印 end
//wstring -> string
std::string str_;
str_.assign(wstr.begin(), wstr.end());
std::cout << str_ << std::endl;
system("pause");
return 0;
}
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输出：
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| HelloWorld
Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
HelloWorld
请按任意键继续. . .
|
char * 与 string 之间的转换
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| #include <iostream>
#include <string>
int main(void)
{
std::string str = "HelloWorld";
//string -> char *
char * cstr = (char *)str.c_str();
std::cout << cstr << std::endl;
//char * -> string
std::string str_ = cstr;
std::cout << str_ << std::endl;
system("pause");
return 0;
}
|
输出：
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| HelloWorld
HelloWorld
请按任意键继续. . .
|
char * 与 wchar_t * 之间的转换
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| #include <iostream>
#include <iomanip>
int main(void)
{
char * cstr = "HelloWorld";
std::cout << cstr << std::endl;
// char * -> wchar_t *
//wchar_t * wcstr = (wchar_t *)cstr; //error
//success
size_t len = strlen(cstr) + 1;
size_t converted = 0;
wchar_t *wcstr;
wcstr=(wchar_t*)malloc(len*sizeof(wchar_t));
mbstowcs_s(&converted, wcstr, len, cstr, _TRUNCATE);
//打印
wchar_t * temp = wcstr;
int i = 0;
std::cout << "Unicode is ";
while(temp[i]!='\0'){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << temp[i] << " ";
i++;
}
std::cout << std::endl;
//打印 end
std::cout << "------------------" << std::endl;
//-------------------------------------------------
wchar_t * wcstr_ = L"HelloWorld";
//打印
wchar_t * temp_ = wcstr_;
int i_ = 0;
std::cout << "Unicode is ";
while(temp_[i_]!='\0'){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << temp_[i_] << " ";
i_++;
}
std::cout << std::endl;
//打印 end
//wchar_t * -> char *
size_t len_ = wcslen(wcstr_) + 1;
size_t converted_ = 0;
char * cstr_;
cstr_ = (char*)malloc(len*sizeof(char));
wcstombs_s(&converted_, cstr_, len_, wcstr_, _TRUNCATE);
std::cout << cstr_ << std::endl;
system("pause");
return 0;
}
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输出：
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| HelloWorld
Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
------------------
Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
HelloWorld
请按任意键继续. . .
|
注意：
cstr、wcstr、cstr_ 是地址变量，使用 std::cout << cstr_ << std::endl;代码打印的值是地址，并不是字符串的值。wchar_t * 与 char * 之间的转换，使用wchar_t * wcstr = (wchar_t *)cstr;是错误的。（异想天开）
wchar_t * 与 wstring 之间的转换
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| #include <iostream>
#include <string>
#include <iomanip>
int main(void)
{
std::wstring wstr = L"HelloWorld";
//打印
std::cout << "Unicode is ";
for(int i=0; i<wstr.length(); i++){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << wstr[i] << " ";
}
std::cout << std::endl;
//打印 end
//wstring -> wchar_t *
wchar_t * wcstr = (wchar_t *)wstr.c_str();
//打印
wchar_t * temp = wcstr;
int i = 0;
std::cout << "Unicode is ";
while(temp[i]!='\0'){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << temp[i] << " ";
i++;
}
std::cout << std::endl;
//打印 end
//wchar_t * -> wstring
std::wstring wstr_ = wcstr;
//打印
std::cout << "Unicode is ";
for(int i=0; i<wstr_.length(); i++){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << wstr_[i] << " ";
}
std::cout << std::endl;
//打印 end
system("pause");
return 0;
}
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输出：
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| Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
请按任意键继续. . .
|
wchar_t * 与 string 之间的转换
知道了上面的几种转换，我们就可以通过组合它们，来实现，比如：wchar_t * 与 string 之间的转换。
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| #include <iostream>
#include <string>
#include <iomanip>
int main(void)
{
std::wstring wstr = L"HelloWorld";
wchar_t * wcstr = (wchar_t *)wstr.c_str();
//打印
wchar_t * temp = wcstr;
int i = 0;
std::cout << "Unicode is ";
while(temp[i]!='\0'){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << temp[i] << " ";
i++;
}
std::cout << std::endl;
//打印 end
//wchar_t * -> string (wchar_t * -> wstring -> string)
std::wstring wstr_ = wcstr;
std::string str;
str.assign(wstr_.begin(), wstr_.end());
std::cout << str << std::endl;
//string -> wchar_t * (string -> wstring -> wchar_t *)
wstr_.assign(str.begin(), str.end());
wchar_t * wcstr_ = (wchar_t *)wstr_.c_str();
//打印
wchar_t * temp_ = wcstr;
int i_ = 0;
std::cout << "Unicode is ";
while(temp_[i_]!='\0'){
std::cout << "U+" << std::setw(4) << std::setfill('0') << std::hex << temp_[i_] << " ";
i_++;
}
std::cout << std::endl;
//打印 end
system("pause");
return 0;
}
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输出：
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| Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
HelloWorld
Unicode is U+0048 U+0065 U+006c U+006c U+006f U+0057 U+006f U+0072 U+006c U+0064
请按任意键继续. . .
|