'用mci命令来实现多媒体的播放功能
'下面的内容几乎有播放器软件的各种功能，你只是引用这些函数就能做出一个播放器来
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public declare function mcisendstring lib "winmm.dll" alias "mcisendstringa" (byval lpstrcommand as string, byval lpstrreturnstring as string, byval ureturnlength as long, byval hwndcallback as long) as long
public declare function mcigetdeviceid lib "winmm.dll" alias "mcigetdeviceida" (byval lpstrname as string) as long
public declare function waveoutgetvolume lib "winmm.dll" (byval udeviceid as long, lpdwvolume as long) as long
public declare function getwindowlong lib "user32" alias "getwindowlonga" (byval hwnd as long, byval nindex as long) as long
public declare function callwindowproc lib "user32" alias "callwindowproca" (byval lpprevwndfunc as long, byval hwnd as long, byval msg as long, byval wparam as long, byval lparam as long) as long
public declare function setwindowlong lib "user32" alias "setwindowlonga" (byval hwnd as long, byval nindex as long, byval dwnewlong as long) as long
public declare function getshortpathname lib "kernel32" alias "getshortpathnamea" (byval lpszlongpath as string, byval lpszshortpath as string, byval cchbuffer as long) as long
enum playtypename
file = 1
cdaudio = 2
vcd = 3
realplay = 4
end enum
dim playtype as playtypename
enum audiosource
audiostereo = 0 ' "stereo"
audioleft = 1 '"left"
audioright = 2 '"right"
end enum
dim hwndmusic as long
dim prevwndproc as long
'=======================================================
'打开mci设备，urlstr为网址,传值代表成功与否
'=======================================================
public function openurl(urlstr as string, optional hwnd as long) as boolean
openmusic = false
dim mcicommand as string
dim driverid as string
closemusic
'mci命令
driverid = getdriverid(urlstr)
if driverid = "realplayer" then
playtype = realplay
exit function
end if
mcicommand = "open " & urlstr & " type " & driverid & " alias nowmusic"
if driverid = "avivideo" or driverid = "mpegvideo" or driverid = "mpegvideo2" then
if hwnd <> 0 then
mcicommand = mcicommand + " parent " & hwnd & " style child"
hwndmusic = getwindowhandle
prevwndproc = getwindowlong(hwndmusic, -4)
setwindowlong hwndmusic, -4, addressof wndproc
else
mcicommand = mcicommand + " style overlapped "
end if
end if
refint = mcisendstring(mcicommand, vbnull, 0, 0)
mcisendstring "set nowmusic time format milliseconds", vbnullstring, 0, 0
if refint = 0 then openmusic = true
end function
'=======================================================
'打开mci设备，filename为文件名,传值代表成功与否
'=======================================================
public function openmusic(filename as string, optional hwnd as long) as boolean
openmusic = false
dim shortpathname as string * 255
dim refshortname as string
dim refint as long
dim mcicommand as string
dim driverid as string
closemusic
'获取短文件名
getshortpathname filename, shortpathname, 255
refshortname = left(shortpathname, instr(1, shortpathname, chr(0)) - 1)
'mci命令
driverid = getdriverid(refshortname)
if driverid = "realplayer" then
playtype = realplay
exit function
end if
mcicommand = "open " & refshortname & " type " & driverid & " alias nowmusic"
