Use multi-media library bass. DLL to play MP3 [3]-Open, play, pause, and stop

// Before playing the video, use the bass_init function to initialize the playing device. Function bass_init (device: integer; {specify the output device. The first is 1 and the second is 2; -1 indicates that the current device is used} freq: DWORD; {sampling rate, generally 44100} flags: DWORD; {it is the combination value of constants such as bass_device_mono and is the effect parameter; 0 is the default value} Win: hwnd; {specify the window handle; 0 indicates the current window} CLSID: pguid {specify a guid to initialize directsound; nil indicates using the default value}): bool; stdcall; External bassdll; // Of course, You need to load the file stream from the file or memory before playing function bass_streamcreatefile (MEM: bool; {loading from the file here is false; loading from memory here is true} f: pointer; {pointer to the file name or memory stream} offset: qword; {start point of playing, unit: 1/10 milliseconds; only in parameter 1: mem = false; default value: 0} length: qword; {Playback End Point, in 1/10 milliseconds; valid only when parameter 1: Mem = false; the default value is 0} flags: A combination of DWORD {bass_sample_3d and other parameters; controls playback effect, repetition, decoding, etc.}): hstream; stdcall; External bassdll; {In addition: when calling the memory stream, the parameter length must be specified as the stream size}

  
 

Form Design Drawing:

CodeFile:

Unit unit1; interfaceuses windows, messages, sysutils, variants, classes, graphics, controls, forms, dialogs, stdctrls; Type tform1 = Class (tform) opendialog1: topendialog; button1: tbutton; button2: tbutton; button3: tbutton; button4: tbutton; Procedure upload (Sender: tobject); Procedure button1click (Sender: tobject); Procedure button2click (Sender: tobject ); procedure button3click (Sender: tobjec T); Procedure button4click (Sender: tobject); Procedure formdestroy (Sender: tobject); end; var form1: tform1; implementation {$ R *. DFM} uses bass; var HS: hstream; {stream handle} procedure tform1.formcreate (Sender: tobject); begin if hiword (bass_getversion) bassversion then MessageBox (0, '"Bass. the DLL file version is not suitable! ', Nil, mb_iconerror); if not bass_init (-1, 44100, 0, 0, nil) Then showmessage ('initialization error'); end; {open the MP3 file, and establish the playing stream} procedure tform1.button1click (Sender: tobject); var mp3path: ansistring; begin {open file} opendialog1.filter: = 'mp3 file (*. MP3) | *. MP3 | WAV file (*. wav) | * WAV '; If opendialog1.execute then mp3path: = ansistring (opendialog1.filename); {if an existing file is opened, release it first} bass_streamfree (HS); {create a stream} HS: = bass_streamcreatefile (false, pansichar (mp3path), 0, 0, 0); {whether enabled successfully, show it} if hs

Form file:

Object form1: tform1 left = 0 Top = 0 caption = 'form1' clientheight = 117 clientwidth = 202 color = clbtnface font. charset = default_charset font. color = clwindowtext font. height =-11 font. name = 'tahoma 'font. style = [] oldcreateorder = false oncreate = formcreate ondestroy = formdestroy pixelsperinch = 96 textheight = 13 object button1: tbutton left = 16 Top = 17 width = 75 Height = 25 caption = #25171 #24320 taborder = 0 onclick = button1click end object button2: tbutton left = 112 Top = 17 width = 75 Height = 25 caption = #25773 #25918 taborder = 1 onclick = button2click end object button3: tbutton left = 112 Top = 48 width = 75 Height = 25 caption = #26242 #20572 taborder = 2 onclick = button3click end object button4: tbutton left = 112 Top = 79 width = 75 Height = 25 caption = #20572 #27490 taborder = 3 onclick = button4click end object opendialog1: topendialog left = 40 top = 56 endend