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;
}