Questions tagged [widestring]
112 questions
65
votes
3 answers
What exactly is the L prefix in C++?
I understand what it does: specifies a string literal as a const wchar_t * (wide character string) instead of const char * (plain old characters), but how is it actually defined?
Is it a macro of some sort? Is it an operator for GCC compilers? What…
user965369
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22
votes
1 answer
Why can Delphi DLLs use WideString without using ShareMem?
David's answer to another question shows a Delphi DLL function returning a WideString. I never thought that was possible without the use of ShareMem.
My test DLL:
function SomeFunction1: Widestring; stdcall;
begin
Result := 'Hello';
end;
function…
kobik
- 21,001
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21
votes
4 answers
Is it necessary to convert string to WideString in Delphi?
I found a Windows API function that performs "natural comparison" of strings. It is defined as follows:
int StrCmpLogicalW(
LPCWSTR psz1,
LPCWSTR psz2
);
To use it in Delphi, I declared it this way:
interface
function StrCmpLogicalW(psz1,…
Mariusz Schimke
- 3,185
- 8
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15
votes
5 answers
Can we use wmain() with Unix compilers or it'll work only on Windows?
Can we use the wmain() function with Unix compilers or it'll work only on/for Windows?
Rella
- 65,003
- 109
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10
votes
1 answer
Why do I need Sharemem in my Delphi dll which only exposes a function with WideString parameters?
I have a dll and a test application written in Delphi. The test application uses multiple threads to call the function exported by the dll. The exported function has a trivial thread safe implementation. When running the test application various…
RM.
- 1,984
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- 29
10
votes
6 answers
How to display L"أَبْجَدِيَّة عَرَبِيَّة中文" using wcout?
I want to display an Arabic message mixed with Chinese using wcout.
The following code is OK:
#include
using namespace std;
int main()
{
wcout.imbue(locale("chs"));
wcout << L"中文"; // OK
}
However, the following code doesn't…
xmllmx
- 39,765
- 26
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9
votes
1 answer
C++: wide characters outputting incorrectly?
My code is basically this:
wstring japan = L"日本";
wstring message = L"Welcome! Japan is ";
message += japan;
wprintf(message.c_str());
I'm wishing to use wide strings but I do not know how they're outputted, so I used wprintf. When I run…
John D.
- 265
- 4
- 10
8
votes
2 answers
Delphi 2010 Wide functions vs. String functions
We're currently converting a Delphi 2007 project to Delphi 2010. We were already using Unicode (via WideStrings and TNT Unicode Controls).
I was expecting to replace all Wide functions, e.g. WideUpperCase, with their equivalent, e.g. UpperCase, but…
Mick
- 846
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7
votes
2 answers
When should we prefer wide-character strings?
I am modernizing a large, legacy MFC codebase which contains a veritable medley of string types:
CString
std::string
std::wstring
char*
wchar_t*
_bstr_t
I'd like to standardize on a single string type internally, and convert to other types only…
BTownTKD
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7
votes
4 answers
When and why can sprintf fail?
I'm using swprintf to build a string into a buffer (using a loop among other things).
const int MaxStringLengthPerCharacter = 10 + 1;
wchar_t* pTmp = pBuffer;
for ( size_t i = 0; i < nNumPlayers ; ++i)
{
const int nPlayerId = GetPlayer(i);
…
Srekel
- 2,183
- 3
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- 26
7
votes
4 answers
Converting wide char string to lowercase in C++
How do I convert a wchar_t string from upper case to lower case in C++?
The string contains a mixture of Japanese, Chinese, German and Greek characters.
I thought about using…
Nitramk
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6
votes
2 answers
Mixing wide and narrow string literals in C
Just found out that all of the following work:
printf( "%ls\n", "123" L"456" );
printf( "%ls\n", L"123" "456" );
printf( "%ls\n", L"123" L"456" );
The output is
123456
123456
123456
Why can I freely mix and match wide and narrow string literals to…
dragonroot
- 5,653
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6
votes
4 answers
(Wide)String - storing in TFileStream, Delphi 7. What is the fastest way?
I'm using Delphi7 (non-unicode VCL), I need to store lots of WideStrings inside a TFileStream. I can't use TStringStream as the (wide)strings are mixed with binary data, the format is projected to speed up loading and writing the data ... However I…
migajek
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5
votes
2 answers
Delphi XE2 AnsiFormat() and ANSI String constants
Is there a handy Format() function that works only on Ansi strings? Because everytime I use an AnsiString with Format() I get a warning. And no, I don't want Delphi to convert my AnsiStrings back and forth between Wide and Ansi strings. That is just…
Brian Hawk
- 728
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5
votes
2 answers
How can I make fixed-length Delphi strings use wide characters?
Under Delphi 2010 (and probably under D2009 also) the default string type is UnicodeString.
However if we declare...
const
s :string = 'Test';
ss :string[4] = 'Test';
... then the first string s if declared as UnicodeString, but the second one…
GJ.
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