wstring

How can I get a substring of a std::wstring which includes some non-ASCII characters? The following code does not output anything: (The text is an Arabic word contains 4 characters where each character has two bytes, plus the word "Hello") #include <iostream> #include <string> using namespace std; int main() { wstring s = L"سلام hello"; wcout << s.substr(0,3) << endl; wcout << s.substr(4,5) << endl; return 0; } This should work: live on Coliru #include <iostream> #include <string> #include <boost/regex/pending/unicode_iterator.hpp> using namespace std; template <typename C> std::string to_utf8

I have a std::wstring whose size is 139,580,199 characters. For debugging I printed it into file with this code: std::wofstream f(L"C:\\some file.txt"); f << buffer; f.close(); After that noticed that the end of string is missing. The created file size is 109,592,584 bytes (and the "size on disk" is 109,596,672 bytes). Also checked if buffer contains null chars, did this: size_t pos = buffer.find(L'\0'); Expecting result to be std::wstring::npos but it is 18446744073709551615 , but my string doesn't have null char at the end so probably it's ok. Can somebody explain, why I have not all string

I would like to convert a string variable to wstring due to some german characters that cause problem when doing a substr over the variable. The start position is falsified when any these special characters is present before it. (For instance: for "ä" size() returns 2 instead of 1) I know that the following conversion works: wstring ws = L"ä"; Since, I am trying to convert a variable, I would like to know if there is an alternative way for it such as wstring wstr = L"%s"+str //this is syntaxically wrong, but wanted sth alike Beside that, I have already tried the following example to convert

I'm new to C++ and I have this issue. I have a string called DATA_DIR that I need for format into a wstring. string str = DATA_DIR; std::wstring temp(L"%s",str); Visual Studio tells me that there is no instance of constructor that matches with the argument list. Clearly, I'm doing something wrong. I found this example online std::wstring someText( L"hello world!" ); which apparently works (no compile errors). My question is, how do I get the string value stored in DATA_DIR into the wstring constructor as opposed to something arbitrary like "hello world"? Here is an implementation using

I am writing a program that needs to be able to work with text in all languages. My understanding is that UTF-8 will do the job, but I am experiencing a few problems with it. Am I right to say that UTF-8 can be stored in a simple char in C++? If so, why do I get the following warning when I use a program with char , string and stringstream : warning C4566: character represented by universal-character-name '\uFFFD' cannot be represented in the current code page (1252) . (I do not get that error when I use wchar_t , wstring and wstringstream .) Additionally, I know that UTF is variable length.

I want to convert wstring to u16string in C++. I can convert wstring to string, or reverse. But I don't know how convert to u16string . u16string CTextConverter::convertWstring2U16(wstring str) { int iSize; u16string szDest[256] = {}; memset(szDest, 0, 256); iSize = WideCharToMultiByte(CP_UTF8, NULL, str.c_str(), -1, NULL, 0,0,0); WideCharToMultiByte(CP_UTF8, NULL, str.c_str(), -1, szDest, iSize,0,0); u16string s16 = szDest; return s16; } Error in WideCharToMultiByte(CP_UTF8, NULL, str.c_str(), -1, szDest, iSize,0,0);'s szDest . Cause of u16string can't use with LPSTR . How can I fix this code