[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
> Actualy (maybe I wrong) but it leads to the same result in that case > that using `reinterpret_cast` > > my problem about doing that is I don't know if it's safe... > I mean, should I not get some mess with some char code > (UTF8)? > You could create a new unsigned string type typedef std::basic_string ustring; ustring s = sqlite3_column_text(..); Maybe that would do what you want and preserve any odd UTF8 characters. Regards Andy Ling --- This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com ---
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
thx Andy, I'll keep that one close. When my program will be ready to perform some tests with UTF8 encoding, I'll try your solution. regards, Nicolas Le Wed, 12 Aug 2015 16:02:54 +, Andy Ling a ?crit : > > Actualy (maybe I wrong) but it leads to the same result in that case > > that using `reinterpret_cast` > > > > my problem about doing that is I don't know if it's safe... > > I mean, should I not get some mess with some char code > > (UTF8)? > > > > You could create a new unsigned string type > > typedef std::basic_string ustring; > > ustring s = sqlite3_column_text(..); > > Maybe that would do what you want and preserve any > odd UTF8 characters. > > Regards > > Andy Ling > --- > This email has been scanned for email related threats and delivered > safely by Mimecast. For more information please visit > http://www.mimecast.com > --- > > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
Hi, Actualy (maybe I wrong) but it leads to the same result in that case that using `reinterpret_cast` my problem about doing that is I don't know if it's safe... I mean, should I not get some mess with some char code (UTF8)? I was expecting some people already did a such cast in the past and just tell me quickly what strategy I should use. Anyway, don't waste your time on that, I stay with my solution and I'll see in the future if I get some issue. thank you John. regards, Nicolas Le Wed, 12 Aug 2015 08:50:26 -0500, John McKown a ?crit : > On Tue, Aug 11, 2015 at 9:06 PM, Nicolas J?ger > wrote: > > > Hi, > > I have some basic problem, but I didn't found the solution so far... > > maybe some people are using C++ and already deal with that problem : > > > > conversion from ?const unsigned char*? to non-scalar type > > ?std::string > > > > I got the `const unsigned char*` from `sqlite3_column_text()` and I > > want to pass the result as a `std::string` parameter to a C++ > > function > > > > regards, > > Nicolas J. > > > > ?Hi! Idiot me again after a bit of sleep. Have you considered casting > away the "unsigned"-ness? > > const char *someVar = (const char *) sqlite3_column_text(...)? > > ?; > std::string some?String(someVar); >
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
On Tue, Aug 11, 2015 at 9:06 PM, Nicolas J?ger wrote: > Hi, > I have some basic problem, but I didn't found the solution so far... > maybe some people are using C++ and already deal with that problem : > > conversion from ?const unsigned char*? to non-scalar type ?std::string > > I got the `const unsigned char*` from `sqlite3_column_text()` and I > want to pass the result as a `std::string` parameter to a C++ function > > regards, > Nicolas J. > ?Hi! Idiot me again after a bit of sleep. Have you considered casting away the "unsigned"-ness? const char *someVar = (const char *) sqlite3_column_text(...)? ?; std::string some?String(someVar); -- Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! <>< John McKown
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
I may found a solution by using 'reinterpret_cast'. Not sure that is a good solution... nicolas
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
hi John, actualy what you suggest it's the common solution. You missed the fact that here, there is an unsigned... in > http://stackoverflow.com/questions/1195675/convert-a-char-to-stdstring you can read : "It has taken me so long to realize that this constructor absolute refuses to match with (unsigned char*) as an argument !" anyway, thx for the try. nicolas.
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
Hi, I have some basic problem, but I didn't found the solution so far... maybe some people are using C++ and already deal with that problem : conversion from ?const unsigned char*? to non-scalar type ?std::string I got the `const unsigned char*` from `sqlite3_column_text()` and I want to pass the result as a `std::string` parameter to a C++ function regards, Nicolas J.
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
Hi, I have some basic problem, but I didn't found the solution so far... maybe some people are using C++ and already deal with that problem : conversion from ?const unsigned char*? to non-scalar type ?std::string I got the `const unsigned char*` from `sqlite3_column_text()` and I want to pass the result as a `std::string` parameter to a C++ function regards, Nicolas J.
[sqlite] I don't know how to cast ‘const unsigned char*’ to a 'const std::string'
Perhaps this will help: http://stackoverflow.com/questions/1195675/convert-a-char-to-stdstring IIRC, something ike std::string return_string(pointer_to_const_unsigned_char_var); return_string is an std::string initialized to the value pointed to my the variable in the initializer. If you want the return_string to have more space, say to append to it, then you can do: std::string return_string(pointer_to_const_unsigned_char_var,) // replace with the size of the area to be allocated. ref: http://en.cppreference.com/w/cpp/string/basic_string/basic_string for the above, in the examples section. FWIW, I am not a C++ programmer. I have read up a bit on it, but found the above with a simple Google search. https://www.google.com/webhp?ie=UTF-8#q=C%2B%2B+std%3A%3Astring+cast On Tue, Aug 11, 2015 at 9:07 PM, Nicolas J?ger wrote: > Hi, > I have some basic problem, but I didn't found the solution so far... > maybe some people are using C++ and already deal with that problem : > > conversion from ?const unsigned char*? to non-scalar type ?std::string > > I got the `const unsigned char*` from `sqlite3_column_text()` and I > want to pass the result as a `std::string` parameter to a C++ function > > regards, > Nicolas J. > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > -- Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! <>< John McKown
