Newbie: can't manage some types...
Hello all, I'm trying to do two tasks which involves some type
conversion, and I'm having dificulties, probably because I haven't yet
understood well how such types works.
First, I wanted to convert UTF-8 strings to ansi, so it displays
correctly at the Windows command prompt. One function to do that is
"toMBSz" from std.windows.charset, which is declared as follows:
const(char)* toMBSz(in char[] s, uint codePage = 0);
So, after some struggling, I managed to write the following code:
import std.stdio;
import std.windows.charset;
void main() {
string s = "Testando acentuação";
auto r = toMBSz (s, 1);
writeln (r[0..19]);
}
Although the above code works, I have an impression that it could be
more elegant and concise, but don't know how to improve it...
I'd also like to play a sound file, so tried to use the function
"PlaySound" from core.sys.windows.mmsystem, declared as follows:
BOOL PlaySoundW(LPCWSTR, HMODULE, DWORD);
According to some error messages I receive, the first parameter is of
type const(char)*, which corresponds to the sound file name, but I
just can't figure out how to convert the string (or a char array) to
that type... Could you please give some snippet example? The closest I
have come, which doesn't compile at all, is as follows:
import core.sys.windows.mmsystem;
void main() {
char[] f = "C:/base/portavox/som/_fon102.wav".dup;
const(wchar)* arq = cast(const(wchar)*)&f;
void* nulo;
uint SND_FILENAME;
PlaySound (arq, nulo, SND_FILENAME);
}
Thank you,
Cleverson
Re: Newbie: can't manage some types...
On Monday, 31 October 2016 at 11:44:25 UTC, Cleverson Casarin
Uliana wrote:
Although the above code works, I have an impression that it
could be more elegant and concise, but don't know how to
improve it...
That's OK except for the last line... the length isn't
necessarily correct so your slice can be wrong.
I'd just use printf or some other function that handles the
zero-terminated char* instead of slicing it.
char[] f = "C:/base/portavox/som/_fon102.wav".dup;
const(wchar)* arq = cast(const(wchar)*)&f;
void* nulo;
uint SND_FILENAME;
PlaySound (arq, nulo, SND_FILENAME);
Oh, that can be much, much, much simpler. Try
PlaySoundW("c:/file.wav"w.ptr, null, SND_FILENAME);
So a few notes:
* SND_FILENAME is a constant defined in the header. You shouldn't
define it yourself, it isn't meant to be a variable.
* The PlaySoundW function takes a wstring, which you can get in D
by sticking the `w` at the end of the literal. So `"foo"` is a
normal string, but `"foo"w` is a wstring. (The difference is
normal is utf-8, wstring is utf-16, which Windows uses
internally.)
* It furthermore takes a pointer, but you want a pointer to data.
A D string or array has a pointer internally you can fetch via
the `.ptr` property. Windows expects this string to be
zero-terminated... which D string literals are, but other D
strings may not be. There's a function in `std.utf` that
guarantees it:
http://dpldocs.info/experimental-docs/std.utf.toUTF16z.html
const(wchar)* safe_to_pass_to_windows = toUTF16z("your string");
Re: Newbie: can't manage some types...
Thank you very much, Adam, now I'm receiving another strange error. My
code is this:
import core.sys.windows.mmsystem;
void main() {
PlaySoundW("C:/base/portavox/som/_fon102.wav"w.ptr, null, SND_FILENAME);
}
When trying to compile, it returns:
OPTLINK (R) for Win32 Release 8.00.17
Copyright (C) Digital Mars 1989-2013 All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
tocaSom.obj(tocaSom)
Error 42: Symbol Undefined _PlaySoundW@12
--- errorlevel 1
I made some quick searches, but not sure whether there is some error
messages' index ?
Thanks for helping,
Cleverson
Re: Newbie: can't manage some types...
On Monday, 31 October 2016 at 11:44:25 UTC, Cleverson Casarin
Uliana wrote:
Hello all, I'm trying to do two tasks which involves some type
conversion, and I'm having dificulties, probably because I
haven't yet understood well how such types works.
First, I wanted to convert UTF-8 strings to ansi, so it displays
correctly at the Windows command prompt. One function to do
that is
"toMBSz" from std.windows.charset, which is declared as follows:
const(char)* toMBSz(in char[] s, uint codePage = 0);
So, after some struggling, I managed to write the following
code:
import std.stdio;
import std.windows.charset;
void main() {
string s = "Testando acentuação";
auto r = toMBSz (s, 1);
writeln (r[0..19]);
}
Although the above code works, I have an impression that it
could be more elegant and concise, but don't know how to
improve it...
I'd also like to play a sound file, so tried to use the
function "PlaySound" from core.sys.windows.mmsystem, declared
as follows: BOOL PlaySoundW(LPCWSTR, HMODULE, DWORD);
According to some error messages I receive, the first parameter
is of
type const(char)*, which corresponds to the sound file name,
but I
just can't figure out how to convert the string (or a char
array) to
that type... Could you please give some snippet example? The
closest I
have come, which doesn't compile at all, is as follows:
import core.sys.windows.mmsystem;
void main() {
char[] f = "C:/base/portavox/som/_fon102.wav".dup;
const(wchar)* arq = cast(const(wchar)*)&f;
void* nulo;
uint SND_FILENAME;
PlaySound (arq, nulo, SND_FILENAME);
}
Thank you,
Cleverson
Cleverson,
About your question related to "Testando acentuação", and
assuming you're using Windows, you can also do the following:
import std.stdio, std.string;
//A Windows function to set the code page of the console output
extern (Windows): private int SetConsoleOutputCP(uint codepage);
void main()
{
SetConsoleOutputCP(65001);
string s = "Testando acentuação";
writeln("Output: ", s.toUpper());
}
Cheers
Re: Newbie: can't manage some types...
On Monday, 31 October 2016 at 14:02:01 UTC, Cleverson Casarin Uliana wrote: Error 42: Symbol Undefined _PlaySoundW@12 This is the most common linker error, it means you used a function without including the library. PlaySound's docs https://msdn.microsoft.com/en-us/library/windows/desktop/dd743680%28v=vs.85%29.aspx at the bottom list some facts about it. One is "Library - winmm.lib" When you use that function, gotta include the library file somehow. Easiest is to just list it on your compile command: dmd yourfile.d winmm.lib since winmm.lib is provided with the operating system, that should just work.
Re: Newbie: can't manage some types...
Thanks Adam for your kindness, it Works now. Thanks Alfred for the hint on setting the console output to 65001, will be useful as well. Greetings Cleverson
Re: Newbie: can't manage some types...
On Monday, 31 October 2016 at 16:06:48 UTC, Adam D. Ruppe wrote: dmd yourfile.d winmm.lib i personally like https://dlang.org/spec/pragma.html#lib pragma(lib, "winmm.lib");
