Visual C++ :: Whether 0xFFFF Is A Valid Unicode Character
Dec 22, 2013
I just wonder whether 0xFFFF is a valid Unicode character.
When I using the following code:
CStringW strTempW;
CString strTemp1;
INT_PTR nLen;
strTempW.Format(L"%c", 0xFFFF);
nLen = strTempW.GetLength();
strTemp1 += strTempW;
nLen = strTemp1.GetLength();
After executing the first codeline strTempW.Format(L"%c", 0xFFFF), I will get strTempW of length 1, but cannot see it first character in Visual Studio watch window.
After executing the codelilne strTemp1 += strTempW, I will get strTemp1 of length 0.
Whether 0xFFFF is taken as a valid Unicode or not?
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Aug 29, 2013
I have some code that was compiled without Unicode turned on in the Preprocessor Definitions. I need to access an API that had Unicode turned on in the Preprocessor Definitions (I believe that it is on by default for DLL's) .
I need to call a function in the DLL that requires a structure like:
struct READERINFO {
TCHAR serial[32];
TCHAR altSerial[32];
TCHAR name[32];
TCHAR fccId[48];
TCHAR hwVersion[16];
int swVerMajor;
int swVerMinor;
char devBuild;
};
It returns some information in the structure some of it is Unicode based however the program that is calling it is not Unicode. The preprocessors are not turned on because if they were there would be a lot of things to change in this code. The code is old code that I inherited and now I must interface to some new devices.
I declare my structure as :
READERINFO info; Then I call the function in the DLL which looks like: ApiGetReaderInfo(hAPI, &info, sizeof(into));
Which is defined as:
ApiGetReaderInfo(HANDLE hApi,
Struct READERINFO * ri,
DWORD riSize);
Parameters:
hApiHandle to valid Api object instance
riPointer to the READERINFO structure.
riSizeSize of ri structure in bytes. Usually: sizeof(struct READERINFO).
When I call it from my program that does not have UNICODE defined in the Pre-Processors I get :
Characters like : ÌÌÌÌÌ in the TCHAR fields and invalid numbers in the integer fields.
int ModuleVersion(HANDLE hApi) {
struct READERINFO info;
ApiGetReaderInfo(hApi, &info, sizeof(info));
[Code] ....
When I call it from my program that has some sample code just for this and has the UNICODE defined in the Preprocessors it works just fine. how I can call this from my old code and get the correct information. I have already tried to do the follow without success:
int ModuleVersion(HANDLE hApi) {
#define UNICODE
struct READERINFO info;
#undef UNICODE
ApiGetReaderInfo(hApi, &info, sizeof(info));
[Code] .....
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Feb 18, 2014
I am using VC++ 2005, Multibyte char set. I am getting hex values from stream and i have to show it in respective language.
in below example
char mt[] = { 0x0C, 0x85, 0x0C, 0x86, 0x0C, 0x87,0x0C, 0x88,0x0C, 0x89, 0x0C, 0x8A,0x0C, 0x8B,
0x0c, 0x85 , 0x0c , 0x86 , 0x0c , 0x87 , 0x0c , 0x88 , 0x0c , 0x89 , 0x0c , 0x8a , 0x0c , 0x8b , 0x00 , 0x20,
0x0c, 0x8e , 0x0c , 0x8f , 0x0c , 0x90 , 0x0c , 0x92 , 0x0c , 0x93 , 0x0c , 0x94 , 0x00 , 0x20 , 0x0c , 0x95,
0x0c, 0x96 , 0x0c , 0x97 , 0x0c , 0x98 , 0x0c , 0x99 , 0x00 , 0x20 , 0x0c , 0x9a , 0x0c , 0x9b , 0x0c , 0x9c,
0x0c, 0x9d , 0x0c , 0x9e , 0x00 , 0x20 , 0x0c , 0x9f , 0x0c , 0xa0 , 0x0c , 0xa1 , 0x0c , 0xa2 , 0x0c , 0xa3,
0x00, 0x20 , 0x0c , 0xa4 , 0x0c , 0xa5 , 0x0c , 0xa6 , 0x0c , 0xa7 , 0x0c , 0xa8 , 0x00 , 0x20 , 0x0c , 0xaa,
0x0c, 0xab , 0x0c , 0xac , 0x0c , 0xad , 0x0c , 0xae , 0x00 , 0x20 , 0x0c , 0xaf , 0x0c , 0xb0 , 0x0c , 0xb2,
0x0c, 0xb5 , 0x0c , 0xb6};
How can i convert the mt string to below string?
"ಅಆಇಈಉಊಋ ಎಏಐಒಓಔ ಕಖಗಘಙ ಚಛಜಝಞ ಟಠಡಢಣ ತಥದಧನ ಪಫಬಭಮ ಯರಲವಶ"
To cross check the mt array, If you place the above string to the below link you get mt array [URL] ....
Cant i do it in "Multibyte char set" settings? or should i use Unicode settings.
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Nov 20, 2012
Working in Win32 console app (VS 2010) I have been trying to convert several Unicode (UTF-16) C++ functions to Ansi C (UTF-8). The test app includes two tokenizer classes, each of which work perfectly well in their respective environments, CTokA and CTokW (UTF-8 and UTF-16).
A problem arises when I attempt to run the UTF-8 functions when the Character Set properties is set to 'Use Unicode Character Set' in that std::string manipulations do not perform as expected, e.g.,
printf("start
");
gets reproduced as
printf("start
");══════════ ²²²²
Attempting to null terminate the string where it is supposed to end simply results in a space in that position and the garbage end persists, e.g.,
printf("sta t
");══════════ ²²²²
Code:
sline[11] = 0x0000;
If I attempt to change the Character Set property to 'Use Multibyte Character Set' or 'Not Set', the app will not compile and hundreds of errors occur. Of course, I can eliminate all of the UTF-16 code, but it strikes me that it should not be necessary. Perhaps if M$ made everything UTF-16 without all of the necessary decorations like 'L' and '_T(', life would be much simpler. Unfortunately, I have a very extensive UTF-8 app under 10 years of development that works quite well, but my UTF-16 (Unicode) conversion doesnt work as well because of the mixing of pointers (I think), so I have had to revert much of the code back to UTF-8. (All of which has nothing to do with my question but is simply psychotheraputic for me to ventilate on.)
My question is this: Can UTF-8 and UTF-16 code coexist in a single Win32 console app?
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Mar 20, 2015
I'm transferring a unicode string from one program to another with UTF-8 encoding.
Program that is sending:
Code:
// Convert path
std::wstring_convert<std::codecvt_utf8<wchar_t>> utf8_converter;
CString arg = L" /PATH="" + CString(utf8_converter.to_bytes(path).c_str()) + L""";
Program that is retrieving:
Code:
// Restore original path
std::wstring_convert<std::codecvt_utf8<wchar_t>> utf8_converter;
std::wstring path = utf8_converter.from_bytes( argument );
Everything has worked fine, until running on a Japanese edition of Windows.
The "byte path" then looks something like "C:¥Users¥d✝?✝a ,?¥AppData¥Local¥Temp¥file.txt".
"from_bytes()" will throw an std::range_error exception "bad conversion".
The program works fine when working with Japenese writing inside paths in the English edition.
What could be causing the "bad conversion"?
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Sep 25, 2012
I am working to make a translating software from an Urdu sentence into Hindi and vice versa, i am using visual c++ 2010 software with c++ language. i have written an Urdu sentence in a text file. now i want to get a single character one by one from that file so that i can work on it to convert it into its equivalent Hindi character. when i use get() function to get a single character from input file and write this single character on output file, i get some unknown ugly looking character placed in output file. My code is as follows
Code:
#include<iostream>
#include<fstream>
#include<cwchar>
#include<cstdlib>
using namespace std;
void main() {
wchar_t arry[50];
[Code] .....
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Mar 11, 2013
I was asked by a friend about validity of following function prototypes,
void func1(int = 0, int*);
void func2(int = 1, int& = 2);
void func3(int*, int& = 3);
void func4(int& = 4, int* = 0);
void func5(int& = 0, int = 1);
void func6(int = 5, int& = 6, int* = 0);
I think the only prototype that is invalid is func1 because it does not have default parameter on the far right.
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Jan 27, 2013
The following code writes to a file on either local disk to a remote disk (commented out code) on Windows 7 platform.
Code:
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream outfile;
[Code].....
The documentation does not specify what is a valid filename (path and filename). For example, will the "\server emp" path work on all operating systems to access a samba share? Does the constructor accept forward and backward slashes as folder separator on all operating systems?
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Mar 19, 2013
How can I write my simple program so if the user enters an invalid number, The program won’t exit? I know I am supposed to use a if (cin) or if (!cin),
But I don’t know where in the program or how I should use it. Right now my Program looks kind of like this:
If (number > 1 && number < 1001)
Go through some function loops
Else
Cout << “invalid number”;
I need to write it so when the user enters an invalid number, the program would Keep asking for the right number until it's given.
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Jul 13, 2013
Now I have to write a code which would determine whether an Email address is valid or not.
In my exercise a valid address should look like this : ___@___.___.il (___ for any letters)
E.g. Valid address:
something @ something . something . il Invalid: tami @ jce . ac . uk
(without spaces of course)
Code:
#include <iostream>
#include <string.h>
using namespace std;
int isValid (char s[]) {
int length=strlen(s), ind1=0, ind2=0;
[Code] ....
It doesn't work well. It says both addresses are wrong when the 1st one isn't.
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Sep 30, 2013
So my program is to check if a certain 9x9 sudoku grid is valid. i have to get the input through command argument. so for example.
./a.out sudoku.txt
So we have make my c program to use FILE I/O open and what not
program behavior must be as follow File does not exist.File contains something other than a sequence of 81 integers (too many, too few, non-int).
One or more of the values is not in the range 1..9 Violation of Sudoku rules (this is the big one!) In case 4, you should report the violation (or any one of the violations if there are multiple -- you do not need to exhaustively enumerate all violations).
For example: Row Violation: entries (2,2) and (2,6) are both equal to 7. (Similarly for column and box violations). All i know is that i need to make a 2d 9 by 9 array
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Jul 21, 2013
Is this a good way of writing this program?I wanted to start fresh with my new code though and a better title.Basically, I took what I learned from my questions in that thread and managed to build a list of musical notes( octaves, frequencies, sharp symbols, basically everything ).
Code:
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#define MAX_NOTES 88 /* 88 keys on a standard piano */
[code]...
I already know the frequencies are correct( they are rounded, but they should be close enough to the value ), but I wasn't so sure about the note labels. Obviously though, I'm not done with this program and I will be adding most of the functions Anduril suggested to take a text file and convert it into music. I just wanted to make sure I had everything correct before moving on. I probably didn't do the GetNextOctave() and GetNextNote() functions very efficiently so need suggestions on those functions also.
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Oct 6, 2014
I have this piece of code in parts of my path finding algorithm
for( int head; head < q.size(); ++ head ){
walk& w = q[head];
// do manything with w
if( some_condition ) q.push_back( walk( w.x + 1, w.y, head ) );
}
However I notice that sometimes w is cannot be dereferenced. It can but it throws junk number at me. Perhaps the vector is changing it size and move the whole array to a different location. Is there anyway to make sure that w is always valid ?
I just want to use w because of shorter typing and cleaner look not because of performance. I also refrain from using macro.
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Mar 20, 2013
Entering valid user input?
How can I write my simple program so if the user enters an invalid number, The program won’t exit? I know I am supposed to use a if (cin) or if (!cin), But I don’t know where in the program or how I should use it. Right now my Program looks kind of like this:
If (number > 1 && number < 1001)
Go through some function loops
Else
Cout << “invalid number”;
I need to write it so when the user enters an invalid number, the program Would Keep asking for the right number until it's given.
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