midiplay.cpp

C++ Builder 6 编程实例教程-北京希望电子出版社出版

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "MidiPlay.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TMidiForm *MidiForm;
//---------------------------------------------------------------------------
__fastcall TMidiForm::TMidiForm(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TMidiForm::Timer1Timer(TObject *Sender)
{
    ScrollBar1->Min=0;
   ScrollBar1->Max= MediaPlayer1->Length;
  ScrollBar1->Position=MediaPlayer1->Position;
    //显示播放进度
        
}
//---------------------------------------------------------------------------
void __fastcall TMidiForm::FormCreate(TObject *Sender)
{
    BitBtn1->Enabled=true;
    BitBtn2->Enabled=false;
    Timer1->Enabled=false;    
}
//---------------------------------------------------------------------------
void __fastcall TMidiForm::BitBtn1Click(TObject *Sender)
{
    OpenDialog1->Title="请选择一个音乐文件：";
    //设置对话框标题
    OpenDialog1->Filter="音乐文件(*.mid)|*.mid";
    //设置文件过滤器
    OpenDialog1->Execute();
    //显示对话框
    if (OpenDialog1->FileName!="")
    {
//        MediaPlayer1->DeviceType=dtSequencer;
        //设置多媒体设备类型
        MediaPlayer1->FileName=OpenDialog1->FileName;
        //设置文件的路径和文件名
        MediaPlayer1->Open();
        //打开多媒体设备
        Timer1->Enabled=true;
        ScrollBar1->Min=0;
        ScrollBar1->Max=MediaPlayer1->Length;
        //设置滚动条参数
        BitBtn2->Enabled=true;
        //设置按钮有效状态
    }
        
}
//---------------------------------------------------------------------------
void __fastcall TMidiForm::BitBtn2Click(TObject *Sender)
{
    MediaPlayer1->Stop();
    //停止播放声音
Close();
}
//---------------------------------------------------------------------------
void __fastcall TMidiForm::ScrollBar1Scroll(TObject *Sender,
      TScrollCode ScrollCode, int &ScrollPos)
{
    MediaPlayer1->Position=ScrollBar1->Position;
    //改变播放进度
    MediaPlayer1->Play();

}
//---------------------------------------------------------------------------