C++ 类型转换
1、std::string 转 int
string valStr = "IconVisible";
int valInt = atoi(valStr.c_str());
2、std::string 转 char*
string valStr = "IconVisible";
const char* valStr_c = valStr.c_str();
3、int 转 string
int StartFilterTimes = 0;
string str = to_string(StartFilterTimes);
4、char* 转 string
const char * c = "test";
string str = (string)c;
5、char* 转 wchar*
wchar_t* Common::charToWChar(const char* c) {
const size_t cSize = strlen(c) + 1;
wchar_t* wc = new wchar_t[cSize];
mbstowcs(wc, c, cSize);
return wc;
}
6、wstring 转 string
std::string Common::WString2String(const std::wstring& ws)
{
std::string strLocale = setlocale(LC_ALL, "");
const wchar_t* wchSrc = ws.c_str();
size_t nDestSize = wcstombs(NULL, wchSrc, 0) + 1;
char* chDest = new char[nDestSize];
memset(chDest, 0, nDestSize);
wcstombs(chDest, wchSrc, nDestSize);
std::string strResult = chDest;
delete[]chDest;
setlocale(LC_ALL, strLocale.c_str());
return strResult;
}
7、string 转 LPCWSTR
LPCWSTR stringToLPCWSTR(std::string orig)
{
size_t origsize = orig.length() + 1;
const size_t newsize = 100;
size_t convertedChars = 0;
wchar_t* wcstring = (wchar_t*)malloc(sizeof(wchar_t) * (orig.length() - 1));
mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);
return wcstring;
}
8、CString == wchar_t*
9、wchar_t* 转string
void Wchar_tToString(std::string& szDst, wchar_t* wchar)
{
wchar_t* wText = wchar;
DWORD dwNum = WideCharToMultiByte(CP_OEMCP, NULL, wText, -1, NULL, 0, NULL, FALSE);// WideCharToMultiByte的运用
char* psText; // psText为char*的临时数组,作为赋值给std::string的中间变量
psText = new char[dwNum];
WideCharToMultiByte(CP_OEMCP, NULL, wText, -1, psText, dwNum, NULL, FALSE);// WideCharToMultiByte的再次运用
szDst = psText;// std::string赋值
delete[]psText;// psText的清除
}
10、LPCWSTR 转string
string WCharToMByte(LPCWSTR lpcwszStr)
{
string str;
DWORD dwMinSize = 0;
LPSTR lpszStr = NULL;
dwMinSize = WideCharToMultiByte(CP_OEMCP, NULL, lpcwszStr, -1, NULL, 0, NULL, FALSE);
if (0 == dwMinSize)
{
return FALSE;
}
lpszStr = new char[dwMinSize];
WideCharToMultiByte(CP_OEMCP, NULL, lpcwszStr, -1, lpszStr, dwMinSize, NULL, FALSE);
str = lpszStr;
delete[] lpszStr;
return str;
}
11、TCHAR 转 string
std::string TCHAR2STRING(TCHAR* STR)
{
int iLen = WideCharToMultiByte(CP_ACP, 0, STR, -1, NULL, 0, NULL, NULL); //首先计算TCHAR 长度。
char* chRtn = new char[iLen * sizeof(char)]; //定义一个 TCHAR 长度大小的 CHAR 类型。
WideCharToMultiByte(CP_ACP, 0, STR, -1, chRtn, iLen, NULL, NULL); //将TCHAR 类型的数据转换为 CHAR 类型。
std::string str(chRtn); //最后将CHAR 类型数据 转换为 STRING 类型数据。
return str;
}