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wxString与各种数据类型之间的转换(摘自:wiki.wxwidgets.org)

2011-12-18 16:46 435 查看

char* to wxString

const char* chars = "Hello world";
// assuming your string is encoded as UTF-8, change the wxConv* parameter as needed
wxString mystring(chars, wxConvUTF8);


wxString to char*

void my_function(const char* foo)
{
}
...
wxString mystring(wxT("HelloWorld"));
// you could give the encoding you want as a parameter to mb_str(), e.g. mb_str(wxConvUTF8)
my_function( mystring.mb_str() );


mb_str() returns a temporary pointer; if you need the output for more than one function call (as is the case above), you can store the char buffer for a little while :

wxString s( wxT("some string") );
wxCharBuffer buffer=s.ToUTF8();
foo( buffer.data() );  // data() returns const char *
bar( buffer.data(), strlen(buffer.data()) );  // in case you need the length of the data


And if you really need to copy it in to char* (but why would you? ;) :

wxString mystring(wxT("HelloWorld"));
char cstring[1024];
// assuming you want UTF-8, change the wxConv* parameter as needed
strncpy(cstring, (const char*)mystring.mb_str(wxConvUTF8), 1023);


You can also use ToUTF8(), since which encoding you get is clearer than with mb_str()

From const char* to char*:

wxString mystring(wxT("HelloWorld"));
(const_cast<char*>((const char*)mystring.mb_str()))


Variadic functions (like printf) won't work with mb_str(), but this will work:

wxString mystring(wxT("HelloWorld"));
printf("%s",mystring.mb_str().data());


Alternatively, use the method recommended in
Potential Unicode Pitfalls:

printf("%s", (const char*)mystring.mb_str())


wchar_t* to wxString

const wchar_t* chars = L"Hello world";
wxString mystring(chars);


wxString to wchar_t*

See the following methods in the docs :

wxString::wc_str()
wxString::wchar_str()


wxString to TCHAR

TCHAR tCharString[255];
wxString myString(_T("Hello World"));
const wxChar* myStringChars = myString.c_str();
for (int i = 0; i < myString.Len(); i++) {
tCharString[i] = myStringChars [i];
}
tCharString[myString.Len()] = _T('\0');


int to wxString

wxString mystring = wxString::Format(wxT("%i"),myint);


or

wxString mystring;
mystring << myint;


float to wxString

wxString mystring = wxString::Format(wxT("%f"), myfloat);


or

wxString mystring;
mystring << myfloat;


wxString to integer number

wxString number(wxT("145"));
long value;
if(!number.ToLong(&value)) { /* error! */ }


or

wxString str = _T("123");
int num;

num = wxAtoi(str);


wxString to floating-point number

wxString number(wxT("3.14159"));
double value;
if(!number.ToDouble(&value)){ /* error! */ }


std::string to wxString

std::string stlstring = "Hello world";
// assuming your string is encoded as UTF-8, change the wxConv* parameter as needed
wxString mystring(stlstring.c_str(), wxConvUTF8);


Starting from wxWidgets 2.9, you may also use the appropriate constructor

std::string stlstring = "Hello world";
// assuming your string is encoded as the current locale encoding (wxConvLibc)
wxString mystring(stlstring);


wxString to std::string

wxWidgets 2.8 :

wxString mystring(wxT("HelloWorld"));
std::string stlstring = std::string(mystring.mb_str());


Under wxWidgets 2.9, you may use

wxString::ToStdString()


std::wstring to wxString

Starting from wxWidgets 2.9, you may use the appropriate constructor

std::sstring stlstring = L"Hello world";
// assuming your string is encoded as the current locale encoding (wxConvLibc)
wxString mystring(stlstring);


wxString to std::wstring

Under wxWidgets 2.9, you may use

wxString::ToStdWstring()
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