3,978 questions
If you want to use LPCTSTR, then:
LPCTSTR t = _T( "Error.wav");
If you want to use L, then:
LPCWSTR t = L"Error.wav";
PlaySoundW(t, . . .);
A problem about char and wchar_t
HeW
1
Reputation point
I wanna add some sounds in my programme,so I used the "PlaySound".
But the problem is this.
(I include the"windows.h".
I use MinGW64)
And then it says "cannot convert 'const wchar_t*' to 'LPCTSTR {aka const char*}' in initialization".
I used many ways to try working out the problem,but they didn't work at all!
I just wanna hear the Error sound.
(Hope you can understand my words,thank you!!!)
ADD:
OK.
I have tried all way.
And if there's no any Error,it won't a EXE FILE there(???
So I use cmd to compile the CPP FILE,it says"undefined reference to `PlaySoundA@12"'.
WHAT IS THIS????I HAVEN'T SEEN!!!
Supplement:
I use vscode and I don't know how to check my Character Set.
I use the GNU gdb (GDB) 7.6.1 from MinGW64 to run.
When I install MinGW,I just click this button:
and I do nothing to it.
Developer technologies | C++
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(201.6, 57.00000000000001%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMY%3C/text%3E%3C/svg%3E)
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HeW 1 Reputation point
2021-12-18T07:46:25.91+00:00 OK.
I have tried all way.
And if there's no any Error,it won't a EXE FILE there(???
So I use cmd to compile the CPP FILE,it says"undefined reference to `PlaySoundA@12"'.
WHAT IS THIS????I HAVEN'T SEEN!!!Supplement:
I use vscode and I don't know how to check my Character Set.
I use the GNU gdb (GDB) 7.6.1 from MinGW64 to run.
When I install MinGW,I just click this button:
]1and I do nothing to it.
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7 answers
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Viorel 122.8K Reputation points2021-12-10T18:33:17.56+00:00 -
HeW 1 Reputation point
2021-12-11T06:54:12.627+00:00 I include the "tchar.h" ans then use the first way.There's NO ANY WRONG BUT NO EXE FILE.WHY????
If I use the second way,it says"cannot convert 'LPCWSTR {aka const wchar_t*}' to 'LPCSTR {aka const char*}' for argument '1' to 'BOOL PlaySoundA(LPCSTR, HMODULE, DWORD)'"
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WayneAKing 4,931 Reputation points2021-12-11T07:52:26.7+00:00 If I use the second way,it says
"cannot convert 'LPCWSTR {aka const wchar_t*}'
to 'LPCSTR {aka const char*}' for argument
'1' to 'BOOL PlaySoundA(LPCSTR, HMODULE, DWORD)'"Read Viorel's example again and pay close
attention to all of the lines of code. In
the 2nd suggestion PlaySoundW is used, not
PlaySound.PlaySound is a macro or typedef which maps to
PlaySoundA if UNICODE is not defined or to
PlaySoundW if it is defined.- Wayne
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Castorix31 90,686 Reputation points2021-12-11T07:04:51.173+00:00 You should use Unicode in your project :
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HeW 1 Reputation point
2021-12-18T07:50:35.69+00:00 I use vscode.
WHAT IS THIS???
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WayneAKing 4,931 Reputation points
2021-12-10T17:48:56.217+00:00 Did you try it without the "L" prefix?
If so, what happened?
- Wayne
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HeW 1 Reputation point
2021-12-11T06:49:08.653+00:00 It says"A value of type "const char *" cannot be used to initialize an entity of type "LPCTSTR""
(I think this is much more outrageous and impossible!!)
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WayneAKing 4,931 Reputation points
2021-12-11T07:26:11.393+00:00 In VS (2017) the following compiles and links
just fine when UNICODE is not defined.#include <windows.h> int main() { LPCTSTR t = "error.wav"; PlaySound(t, NULL, SND_FILENAME | SND_ASYNC); }With Winmm.lib added to the linker Input as an
Additional Dependency in the project properties.If UNICODE is defined, this compiles and links
just fine.#include <windows.h> int main() { LPCTSTR t = L"error.wav"; PlaySound(t, NULL, SND_FILENAME | SND_ASYNC); }- Wayne
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HeW 1 Reputation point
2021-12-18T07:53:50.897+00:00 My UNICODE is defined,and I use your way.
"message": "cannot convert 'const wchar_t*' to 'LPCTSTR {aka const char*}' in initialization",
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(240, 91%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPK%3C/text%3E%3C/svg%3E)
Petrus 【KIM】 546 Reputation points2021-12-13T06:37:30.663+00:00 I think your project's Character Set is "Use Multi-Byte Character Set" or "Not Set".
Just use Preprocessor directives#ifdef UNICODE LPCTSTR sz = L"AAA"; #else LPCTSTR sz = "AAA"; #endif PlaySound(sz, NULL, SND_FILENAME);
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HeW 1 Reputation point
2021-12-18T07:51:34.993+00:00 NO ERROR BUT NO EXE FILE
undefined reference to `PlaySoundA@12'
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WayneAKing 4,931 Reputation points
2021-12-18T09:54:51.16+00:00 undefined reference to `PlaySoundA@12'
You have to tell the linker which lib file to use
for PlaySound which is Winmm.lib- Wayne
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Petrus 【KIM】 546 Reputation points
2021-12-20T00:29:19.66+00:00 Your C++ code is fine. So it compiles fine.
However, the linker does not find the library ("WINMM.LIB") for "PlaySound".
Just add one line like this: #pragma comment(lib, "Winmm.lib")
#include <Windows.h> #pragma comment(lib, "Winmm.lib")
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