[英]c++ / c confusion
我正在嘗試用c ++制作一個小型應用程序,以使用該庫節省內存。 http://musicnote.sourceforge.net/docs/html/index.html
主頁上提供的示例代碼如下所示。
#include "MusicNoteLib.h"
void main()
{
MusicNoteLib::Player player; // Create the Player Object
player.Play("C D E F G A B"); // Play the Music Notes on the default MIDI output port
}
這段代碼無法在Visual Studio 2008中編譯,我遇到很多錯誤,例如
MusicNoteLib.h(22):錯誤C4430:缺少類型說明符-假定為int。 注意:C ++不支持default-int
我不明白該錯誤或從哪里開始尋找...還有一些dll文件可以代替該h文件使用。
#ifndef __MUSICNOTE_LIB_H__EBEE094C_FF6E_43a1_A6CE_D619564F9C6A__
#define __MUSICNOTE_LIB_H__EBEE094C_FF6E_43a1_A6CE_D619564F9C6A__
/** @file MusicNoteLib.h
* \brief Main header file for accessing the MusicNote Library
*/
/// <Summary>
/// This header file can be included directly in your project or through
/// MusicNoteLib.h of the MusicNoteDll project. If included directly, this
/// will be built directly as a satic library. If included through MusicNoteDll
/// this will use dllImports through MUSICNOTELIB_API
/// </Summary>
#ifndef MUSICNOTELIB_API
#define MUSICNOTELIB_API
#endif // MUSICNOTELIB_API
//#include "Player.h"
namespace MusicNoteLib /// Music Programming Library
{
typedef void (__stdcall *LPFNTRACEPROC)(void* pUserData, const TCHAR* szTraceMsg);
typedef void (__stdcall *LPFNERRORPROC)(void* pUserData, long lErrCode, const TCHAR* szErrorMsg, const TCHAR* szToken);
extern "C"
{
MUSICNOTELIB_API typedef void MStringPlayer;
MUSICNOTELIB_API void* GetCarnaticMusicNoteReader();
/// <Summary>
/// Creates a MusicString Player object.
/// </Summary>
MUSICNOTELIB_API MStringPlayer* CreateMusicStringPlayer();
/// <Summary>
/// Plays Music string notes on the default MIDI Output device with the default Timer Resolution.
/// Use PlayMusicStringWithOpts() to use custom values.
/// @param szMusicNotes the Music string to be played on the MIDI output device
/// @return True if the notes were played successfully, False otherwise
/// </Summary>
MUSICNOTELIB_API bool PlayMusicString(const TCHAR* szMusicNotes);
/// <Summary>
/// Same as PlayMusicString() except that this method accepts Callbacks.
/// The Trace and Error callbacks will be used during the Parse of the Music Notes.
/// @param szMusicNotes the Music string to be played on the MIDI output device
/// @param traceCallbackProc the Callback to used to report Trace messages
/// @param errorCallbackProc the Callback to used to report Error messages
/// @param pUserData any user supplied data that should be sent to the Callback
/// @return True if the notes were played successfully, False otherwise
/// </Summary>
MUSICNOTELIB_API bool PlayMusicStringCB(const TCHAR* szMusicNotes,
LPFNTRACEPROC traceCallbackProc,
LPFNERRORPROC errorCallbackProc,
void* pUserData);
/// <Summary>
/// Plays Music string notes on the given MIDI Output device using the given Timer Resolution.
/// Use PlayMusicString() to use default values.
/// @param szMusicNotes the Music notes to be played
/// @param nMidiOutPortID the device ID of the MIDI output port to be used for the play
/// @param nTimerResMS preferred MIDI timer resolution, in MilliSeconds
/// @return True if Play was successful, False otherwise
/// </Summary>
MUSICNOTELIB_API bool PlayMusicStringWithOpts(const TCHAR* szMusicNotes, int nMidiOutPortID, unsigned int nTimerResMS);
/// <Summary>
/// Same as PlayMusicStringWithOpts() except that this method accepts Callbacks.
/// The Trace and Error callbacks will be used during the Parse of the Music Notes.
/// @param szMusicNotes the Music notes to be played
/// @param nMidiOutPortID the device ID of the MIDI output port to be used for the play
/// @param nTimerResMS preferred MIDI timer resolution, in MilliSeconds
/// @param traceCallbackProc the Callback to used to report Trace messages
/// @param errorCallbackProc the Callback to used to report Error messages
/// @param pUserData any user supplied data that should be sent to the Callback
/// @return True if Play was successful, False otherwise
/// </Summary>
MUSICNOTELIB_API bool PlayMusicStringWithOptsCB(const TCHAR* szMusicNotes,
int nMidiOutPortID,
unsigned int nTimerResMS,
LPFNTRACEPROC traceCallbackProc,
LPFNERRORPROC errorCallbackProc,
void* pUserData);
/// <Summary>
/// Save the given MusicString content into a MIDI output file
/// @param szMusicNotes Music Notes to be converted to MIDI output
/// @param szOutputFilePath path of the MIDI output file
/// @return True if the the content was saved successfully, False otherwise
/// </Summary>
MUSICNOTELIB_API bool SaveAsMidiFile(const TCHAR* szMusicNotes, const char* szOutputFilePath);
//MUSICNOTELIB_API typedef void (*ParseErrorProc)(const MusicNoteLib::CParser*, MusicNoteLib::CParser::ErrorEventHandlerArgs* pEvArgs);
//MUSICNOTELIB_API typedef void (*ParseTraceProc)(const MusicNoteLib::CParser*, MusicNoteLib::CParser::TraceEventHandlerArgs* pEvArgs);
MUSICNOTELIB_API void Parse(const TCHAR* szNotes, LPFNTRACEPROC traceCallbackProc, void* pUserData);
} // extern "C"
} // namespace MusicNoteLib
#endif // __MUSICNOTE_LIB_H__EBEE094C_FF6E_43a1_A6CE_D619564F9C6A__
錯誤在此行上:
typedef void (__stdcall *LPFNTRACEPROC)(void* pUserData, const TCHAR* szTraceMsg);
自從我“憤怒”地執行C / C ++以來已經有一段時間了,所以我在這里有些生疏。 在某處存在類型不匹配-實際上是通過將字符串包裝在_T
宏中發現的。
在CPP文件中包含MusicNoteLib.h之前,需要包括聲明LPFNTRACEPROC和TCHAR的標頭。 可能是Player.h,也許不應該像ChrisF建議的那樣被注釋掉,也可能是Windows標頭。
基本思想是,您需要查看編譯器抱怨的行,弄清楚這些行中的符號在哪里聲明,並包括具有這些聲明的適當的頭文件。
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