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How do you return a string from a function correctly in Dynamic C?


How do you return a string from a function correctly in Dynamic C?

By : Ira
Date : November 20 2020, 07:00 PM
wish helps you Here are the problems I can see:
Function char_to_bits returns the char array bits which is local. So its memory will be lost once the function returns. To solve this allocate memory for bits dynamically using malloc and later free it using the function free or you can make it static or declare bits globally.
code :


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Pass dynamic table name to SQL function and return comma delimited string

Pass dynamic table name to SQL function and return comma delimited string


By : user2810927
Date : March 29 2020, 07:55 AM
hope this fix your issue A workaround. UDFs won't work. Maybe CLR, but not native SQL UDF.
First create this proc, which mashes a table into a single row
code :
create proc dbo.GetDelimitedList
@tablename sysname
AS
declare @sql nvarchar(max)
set @sql = '
declare @id nvarchar(max), @item nvarchar(max)
select
    @id = isnull(@id+'','','''') + convert(varchar,id),
    @item = isnull(@item+'','','''') + item
from ' + quotename(@tablename) + '
select @id + ''~'' + @item'
exec (@sql)
GO
declare @tmp table(id int, mashed nvarchar(max))
declare @id int, @tablename sysname
-- start at first table
select top 1 @id = id, @tablename = tablename
from mytable
order by id asc
while @@ROWCOUNT > 0
begin
    -- fill our temp table
    insert @tmp (mashed) exec GetDelimitedList 'mytablelist'
    update @tmp set id = @id where id is null
    -- next table
    select top 1 @id=id, @tablename = tablename
    from mytable
    where id > @id
    order by id asc
end
SELECT * FROM @tmp;
create table mytable(id int, tablename varchar(100))
insert mytable values (1, 'mytablelist')
insert mytable values (3, 'mytablelist2')

create table mytablelist(id int, item varchar(100))
insert mytablelist values
(1, 'item1'),
(2, 'item2')
GO

create table mytablelist2(id int, item varchar(100))
insert mytablelist2 values
(11, 't2item1'),
(22, 't2item2')
GO
How to correctly return and display string value if function does not return true?

How to correctly return and display string value if function does not return true?


By : Sudhakar
Date : March 29 2020, 07:55 AM
wish helps you I am attempting to write a method that checks whether a user exists and also does some validation. , Use Exceptions. Like:
code :
public function checkUsername(){
    if((strlen($_POST['register-username']) > 2) && (strlen($_POST['register-username']) < 16)){
        $stmt = $this->dbh->prepare("SELECT username FROM adrenaline_junkies_uk_users WHERE username = ?");
        $stmt->bindParam(1, $this->post_data['register_username'], PDO::PARAM_STR);
        $stmt->execute();
        if($stmt->rowCount() != 0){
                return TRUE;
        }else{
            throw new Exception("Username already exists.");
        }
    }else{
        throw new Exception("Username must be between 3 and 15 characters.");
    }

}
if( isset($_POST['register-submit'])){

    $error = '';
    $register = new register($_POST, $dbh);
    try {
        if($register->checkUsername()){
            //continue
        }
    } catch ($e) {
        $error .= '<span style="color:red;">' . $e->getMessage() . '</span>';
    }
}
class UsernameException extends Exception {}

try {
    throw new UsernameException("Your username is too awesome");
} catch (UsernameException $e) {
    exit($e->getMessage());
} catch (SomeOtherException $e) {
    exit("500");
} catch (Exception $e) {
    exit("que?");
}
Return string read from buffer and function without dynamic allocation?

Return string read from buffer and function without dynamic allocation?


By : Cogent.co
Date : March 29 2020, 07:55 AM
Does that help There are at least three ways you could reimplement the method to avoid a direct allocation with new.
The Good:
code :
std::vector<ubyte> Readstr() 
{
    std::vector<ubyte> Result;
    for (uint16 i = 0; i < ByteSize; i++) 
    {
        Result.push_back(Buffer[ByteIndex]);
        ByteIndex++;

        if (Buffer[ByteIndex - 1] == ubyte(0)) 
        {
            ByteIndex++;
            break;
        }
    }
    return Result;
}
ubyte* Readstr(ubyte* outputBuffer, size_t maxCount) 
{
    for (uint16 i = 0; i < ByteSize; i++) 
    {
        if (i == maxCount)
            break;

        outputBuffer[i] = Buffer[ByteIndex];
        ByteIndex++;

        if (Buffer[ByteIndex - 1] == ubyte(0)) 
        {
            ByteIndex++;
            break;
        }
    }
    return outputBuffer;
}
ubyte* Readstr() 
{
    enum { MAX_SIZE = 2048 }; // Up to you to decide the max size...
    static ubyte outputBuffer[MAX_SIZE];

    for (uint16 i = 0; i < ByteSize; i++) 
    {
        if (i == MAX_SIZE)
            break;

        outputBuffer[i] = Buffer[ByteIndex];
        ByteIndex++;

        if (Buffer[ByteIndex - 1] == ubyte(0)) 
        {
            ByteIndex++;
            break;
        }
    }
    return outputBuffer;
}
Can't return dynamic string from a function

Can't return dynamic string from a function


By : Ryro Tor
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The code is obviously wrong. string *encrypted_sentence = new string[sentence.size()]; allocates an ARRAY of strings! Not a single string. Judging from that, you can see how your code is wrong.
Perl q function or single quote doesn't return the string literal of UNC path correctly

Perl q function or single quote doesn't return the string literal of UNC path correctly


By : KJK
Date : March 29 2020, 07:55 AM
This might help you From perldoc perlop:
code :
my $path = q(\\dir1\dir2\dir3);
my $path = q(\\\dir1\dir2\dir3);
my $single_quote = 'This is a single quote: \'';
my $backslash = 'This is a backslash: \'; # nope
my $backslash = 'This is a backslash: \\';
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