如何知道某个电脑是否装了MPEG4解码器？

Question

   如何用程序判断某个客户机是否装了MPEG4解码器？
   如果没有装就自动安装，如果装了就不要再安装了。
   
   另外divx在安装时究竟释放了那些文件到windows\system下？我能不能
   将这些文件提取出来自己做安装文件，而不要用divx自带的安装程序？

Answer 1

给你抓了inf文件,你看看吧,它写了注册表,复制文件的自己看看就知道了
; DivX 5.0 Pro Video & Audio Decodec Play Version
; 9x & ME & NT & 2k & XP
; by Seatroll for NASA
; AC3 (dolby 5.1) codec updateded by Seatroll[Version]
Signature = "$CHICAGO$"
Class = MEDIA[SourceDisksNames]
1="Video & Audio pack",, 0001[Installable.Drivers]
divx = 1:divx.dll, "vidc.divx", "%DivX5%" , , ,
l3radus = 1:l3codecp.acm, "msacm.l3radius", "%layer3p%" , , ,[UpdateIni]
system.ini, drivers32,,"vidc.divx=divx.dll"system.ini, drivers32,,"msacm.l3radius=l3codecp.acm"[UpdateIni.un]
system.ini, drivers32,"vidc.divx=*",
system.ini, drivers32,"msacm.l3radius=*",
[SourceDisksFiles]
divx.ico=1
divx.dll=1
divx50.inf=1
divxdec.ax=1
mp4fil32.dll=1
iviaudio.ax=1
mpgaudio.ax=1
l3codecp.acm=1[DefaultInstall]
CopyFiles=DIVX.Copy,DIVX.Copy.Inf
Addreg = DIVX.AddReg, DIVX.AddReg95, DIVX.DoReg
Updateinis = Updateini[DefaultInstall.ntx86]
CopyFiles=DIVX.Copy,DIVX.Copy.Inf
Addreg = DIVX.AddReg, DIVX.AddRegNT, DIVX.DoReg, AddDescriptions.NT
Updateinis = Updateini[Remove_Mpeg]
AddReg = DIVX.Unregister
DelReg = DIVX.DelReg
Updateinis = Updateini.un
DelFiles =DIVX.Copy, DIVX.Copy.Inf[Remove_Mpeg_NT]
AddReg = DIVX.Unregister
DelReg = DIVX.DelReg, DelDescriptions.NT
Updateinis = Updateini.un
DelFiles =DIVX.Copy, DIVX.Copy.Inf[DIVX.Copy]
divx.ico
divx.dll
divxdec.ax
mp4fil32.dll
iviaudio.ax
mpgaudio.ax
l3codecp.acm[DIVX.Copy.Inf]
divx50.inf[DIVX.AddReg95]
; UnInstall
HKLM,"%UnInstallPath%","DisplayName",0,"%UninstallDispName%"
HKLM,"%UnInstallPath%","DisplayICon",0,"%11%\divx.ico"
HKLM,"%UnInstallPath%","UninstallString",0,"%10%\rundll.exe setupx.dll,InstallHinfSection Remove_Mpeg 132 %17%\%InfFile%"[DIVX.AddRegNT]
; UnInstall
HKLM,"%UnInstallPath%","DisplayName",0,"%UninstallDispName%"
HKLM,"%UnInstallPath%","DisplayICon",0,"%11%\divx.ico"
HKLM,"%UnInstallPath%","UninstallString",0,"%11%\rundll32.exe setupapi.dll,InstallHinfSection Remove_Mpeg_NT 132 %17%\%InfFile%"[DIVX.AddReg]
HKLM,"%MediaRes%\icm\vidc.divx","Description",0,"%DivX5%"
HKLM,"%MediaRes%\icm\vidc.divx","Driver",0,"divx.dll"
HKLM,"%MediaRes%\icm\vidc.divx","FriendlyName",0,"%DivX5%"; Layer3
HKLM,"%MediaRes%\acm\msacm.l3radius","Description",0,"%Layer3p%"
HKLM,"%MediaRes%\acm\msacm.l3radius","Driver",0,"L3codecp.acm"
HKLM,"%MediaRes%\acm\msacm.l3radius","FriendlyName",0,"%Layer3p%"
[DivX.DelReg]
HKLM,"%MediaRes%\icm\vidc.divx"HKLM,"%MediaRes%\acm\msacm.l3radius"HKLM,"%UnInstallPath%"[DIVX.DoReg]
HKLM,"%RunOnce%","%Reg_% DivX 5.0 Filter ...",,"%11%\regsvr32.exe /s %11%\divxdec.ax"
HKLM,"%RunOnce%","%Reg_% AC3 codec (intervideo)",,"%11%\regsvr32.exe /s %11%\iviaudio.ax"
HKLM,"%RunOnce%","%Reg_% AC3 codec (mpegvideo)",,"%11%\regsvr32.exe /s %11%\mpgaudio.ax"[DIVX.Unregister]
HKLM,"%RunOnce%","%UnReg_% DivX 5.0 Filter...",,"%11%\regsvr32.exe /s /u %11%\divxdec.ax"
HKLM,"%RunOnce%","%UnReg_% AC3 codec (intervideo)",,"%11%\regsvr32.exe /s /u %11%\iviaudio.ax"
HKLM,"%RunOnce%","%UnReg_% AC3 codec (mpegvideo)",,"%11%\regsvr32.exe /s /u %11%\mpgaudio.ax"[AddDescriptions.NT]
HKLM,"%DrvDescNT%","divx.dll",0,"%DivX5%"
HKLM,"%DrvDescNT%","l3codecp.acm",0,"%Layer3p%"[DelDescriptions.NT]
HKLM,"%DrvDescNT%","divx.dll"
HKLM,"%DrvDescNT%","l3codecp.acm"[DestinationDirs]
DefaultDestDir = 11 ; LoadDir_SYS
DIVX.Copy = 11
DIVX.Copy.Inf = 17[Strings]
Reg_="Registering"
UnReg_="Unregistering"
MediaRes="SYSTEM\CurrentControlSet\Control\MediaResources"
RunOnce="Software\Microsoft\Windows\CurrentVersion\RunOnce\Setup"
DrvDescNT="SOFTWARE\Microsoft\Windows NT\CurrentVersion\drivers.desc"Layer3p="Fraunhofer IIS MPEG Layer-3 Codec (Pro Radius)"
DivX5="DivX 5.0.2 Pro Corporate Edition"
InfFile="divx50.inf"
UninstallDispName="__ DivX 5.0.2 Pro Video Codec __"
UnInstallPath="Software\Microsoft\Windows\CurrentVersion\Uninstall\DivX5PRO"
MediaClassName="Media Devices"
mfgname="Project DivX 5.0 Pro"