CODEWITHSUNDEEP
c++variablesplaysound
HelpPlease
HelpPlease

Reputation: 1

Using String Variables for the function PlaySound

I'm trying to create a program that plays different sounds when you press different keys. I was planning to take the char key , add the string ".wav" and input that new string called "sound" into the line:

PlaySound(TEXT(sound), NULL, SND_FILENAME | SND_ASYNC);

The code does not compile and gives the error "identifier 'Lsound' is undefined" I've tried replacing "TEXT" with "string" but it gives the error message "no suitable conversion function from 'std::string' to 'LPCWSRT' exists".

Any help with a solution would be greatly appreciated.

#include <iostream>
#include <Windows.h>

using namespace std;

int main() {

    char i;

    while (true) {
        for (i = 8; i <= 255; i++) {
            if (GetAsyncKeyState(i) == -32767) {
                string sound = i + ".wav";
                PlaySound(TEXT(sound), NULL, SND_FILENAME | SND_ASYNC);
            }   
        }
    }
    return 0;
}

Upvotes: 0

Views: 745

Answers (3)

Doeus
Doeus

Reputation: 420

The solution depends on what your "Character Set" property (Project Properties / Advanced / Character Set) is set to.

In case of "Use Multi-Byte Character Set":

string sound = to_string(i) + ".wav";
PlaySound(sound.c_str(), NULL, SND_FILENAME | SND_ASYNC);

In case of "Use Unicode Character Set":

wstring sound = to_wstring(i) + L".wav";
PlaySound(sound.c_str(), NULL, SND_FILENAME | SND_ASYNC);

Also, don't forget to include the string header file with #include <string>.

Upvotes: 0

Michael Chourdakis
Michael Chourdakis

Reputation: 11158

Just pass a wide string from the start.

std::wstring sound = i + L".wav";
PlaySound(sound.c_str(), NULL, ...

In Windows, native strings are UTF-16 and are represented by wchar_t and variants of w in STL (wstring etc).

Upvotes: 0

JonathanK
JonathanK

Reputation: 197

You must convert the string to LPCTSTR

Using How to convert std::string to LPCWSTR in C++ (Unicode)

#include <iostream>
#include <Windows.h>

using namespace std;

std::wstring s2ws(const std::string& s)
{
    int len;
    int slength = (int)s.length() + 1;
    len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0);
    wchar_t* buf = new wchar_t[len];
    MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);
    std::wstring r(buf);
    delete[] buf;
    return r;
}


int main() {
    while (true) {
        for (int i = 8; i <= 255; i++) {
            if (GetAsyncKeyState(i) == -32767) {
                string sound = i + ".wav";
                PlaySound(s2ws(sound).c_str(), NULL, SND_FILENAME | SND_ASYNC);
            }
        }
    }
    return 0;
}

Upvotes: 0

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