无法加载MediaInfo库

Question

我在我的C#项目中使用Mediainfo库，在开始调用这个动态链接库之前，我只是运行了VC++程序，该程序随程序包一起提供并部署到我的本地system.am中，我不知道它在部署时到底做了什么，它在系统中注册了一些东西，所以我的进程可以识别mediainfo.dll，所以它在我的本地(32位)中工作得很好。

当我开始在测试服务器中部署时，我不能运行或部署VC++(bcoz测试服务器没有visual studio来做这件事，除了调试器).so收到这个错误

 public class MediaInfo
{
    //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory)  

    [DllImport("MediaInfo.dll")]
    private static extern IntPtr MediaInfo_New();


    //MediaInfo class

    public String Inform()
    {
        if (Handle == (IntPtr)0)
            return "Unable to load MediaInfo library";
        if (MustUseAnsi)
            return Marshal.PtrToStringAnsi(MediaInfoA_Inform(Handle, (IntPtr)0));
        else
            return Marshal.PtrToStringUni(MediaInfo_Inform(Handle, (IntPtr)0));
    }
    public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch)
    {
        if (Handle == (IntPtr)0)
            return "Unable to load MediaInfo library";
        if (MustUseAnsi)
        {
            IntPtr Parameter_Ptr=Marshal.StringToHGlobalAnsi(Parameter);
            String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter_Ptr, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch));
            Marshal.FreeHGlobal(Parameter_Ptr);
            return ToReturn;
        }
        else
            return Marshal.PtrToStringUni(MediaInfo_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch));
    }
    public String Get(StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo)
    {
        if (Handle == (IntPtr)0)
            return "Unable to load MediaInfo library";
        if (MustUseAnsi)
            return Marshal.PtrToStringAnsi(MediaInfoA_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo));
        else
            return Marshal.PtrToStringUni(MediaInfo_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo));
    }
    public String Option(String Option, String Value)
    {
        if (Handle == (IntPtr)0)
            return "Unable to load MediaInfo library";
        if (MustUseAnsi)
        {
            IntPtr Option_Ptr=Marshal.StringToHGlobalAnsi(Option);
            IntPtr Value_Ptr=Marshal.StringToHGlobalAnsi(Value);
            String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Option(Handle, Option_Ptr, Value_Ptr));
            Marshal.FreeHGlobal(Option_Ptr);
            Marshal.FreeHGlobal(Value_Ptr);
            return ToReturn;
        }
        else
            return Marshal.PtrToStringUni(MediaInfo_Option(Handle, Option, Value));
    }
    public int State_Get() { if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_State_Get(Handle); }
    public int Count_Get(StreamKind StreamKind, int StreamNumber) { if (Handle == (IntPtr)0) return 0; return (int)MediaInfo_Count_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber); }
    private IntPtr Handle;
    private bool MustUseAnsi;

    //Default values, if you know how to set default values in C#, say me
    public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); }
    public String Get(StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); }
    public String Get(StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text); }
    public String Option(String Option_) { return Option(Option_, ""); }
    public int Count_Get(StreamKind StreamKind) { return Count_Get(StreamKind, -1); }
}

只是谷歌通过SourceForge.net找到了这个https://sourceforge.net/projects/mediainfo/forums/forum/297610/topic/4037237，但我仍然不知道他们在暗示什么。

看起来他们要求导入com对象，但是有人能指导我如何在C#中导入com对象吗？

为什么它不能导入dll，这是不是有其他的导入方式，或者只是给出了找到dll的路径？

喜欢

PathToMediaInfoDLL := "C:\Documents and Settings\Administrator\My Documents\autohotkey\MediaInfo.dll"

提前谢谢你。

Answer 1

要在c#中运行MediaInfo，您不需要运行任何VC++。只需下载二进制文件。但你需要记住几件事：

第一:使用正确版本的mediainfo.dll x32或x64。

第二:媒体库所在的路径需要系统可见。So或MediaInfo.dll与应用程序在同一文件夹中，或者文件夹被添加到系统路径中。

第三:使用附加到库的c#包装类来实现更简单的互操作。

下面是从源forge下载的正确的包装类：

// MediaInfoDLL - All info about media files, for DLL
// Copyright (C) 2002-2009 Jerome Martinez, Zen@MediaArea.net
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// MediaInfoDLL - All info about media files, for DLL
// Copyright (C) 2002-2009 Jerome Martinez, Zen@MediaArea.net
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Microsoft Visual C# wrapper for MediaInfo Library
// See MediaInfo.h for help
//
// To make it working, you must put MediaInfo.Dll
// in the executable folder
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

using System;
using System.Runtime.InteropServices;

namespace MediaInfoLib
{
    public enum StreamKind
    {
        General,
        Video,
        Audio,
        Text,
        Chapters,
        Image
    }

    public enum InfoKind
    {
        Name,
        Text,
        Measure,
        Options,
        NameText,
        MeasureText,
        Info,
        HowTo
    }

    public enum InfoOptions
    {
        ShowInInform,
        Support,
        ShowInSupported,
        TypeOfValue
    }

    public enum InfoFileOptions
    {
        FileOption_Nothing      = 0x00,
        FileOption_NoRecursive  = 0x01,
        FileOption_CloseAll     = 0x02,
        FileOption_Max          = 0x04
    };


    public class MediaInfo
    {
        //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory)  
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_New();
        [DllImport("MediaInfo.dll")]
        private static extern void   MediaInfo_Delete(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string FileName);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open(IntPtr Handle, IntPtr FileName);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open_Buffer_Init(IntPtr Handle, Int64 File_Size, Int64 File_Offset);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open(IntPtr Handle, Int64 File_Size, Int64 File_Offset);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open_Buffer_Continue(IntPtr Handle, IntPtr Buffer, IntPtr Buffer_Size);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open_Buffer_Continue(IntPtr Handle, Int64 File_Size, byte[] Buffer, IntPtr Buffer_Size);
        [DllImport("MediaInfo.dll")]
        private static extern Int64  MediaInfo_Open_Buffer_Continue_GoTo_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern Int64  MediaInfoA_Open_Buffer_Continue_GoTo_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Open_Buffer_Finalize(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Open_Buffer_Finalize(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern void   MediaInfo_Close(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Inform(IntPtr Handle, IntPtr Reserved);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Inform(IntPtr Handle, IntPtr Reserved);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_GetI(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_GetI(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, [MarshalAs(UnmanagedType.LPWStr)] string Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Option(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string Option, [MarshalAs(UnmanagedType.LPWStr)] string Value);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoA_Option(IntPtr Handle, IntPtr Option,  IntPtr Value);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_State_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfo_Count_Get(IntPtr Handle, IntPtr StreamKind, IntPtr StreamNumber);

        //MediaInfo class
        public MediaInfo()
        {
            Handle = MediaInfo_New();
            if (Environment.OSVersion.ToString().IndexOf("Windows")==-1)
                MustUseAnsi=true;
            else
                MustUseAnsi=false;
        }
        ~MediaInfo() { MediaInfo_Delete(Handle); }
        public int Open(String FileName)
        {
            if (MustUseAnsi)
            {
                IntPtr FileName_Ptr = Marshal.StringToHGlobalAnsi(FileName);
                int ToReturn = (int)MediaInfoA_Open(Handle, FileName_Ptr);
                Marshal.FreeHGlobal(FileName_Ptr);
                return ToReturn;
            }
            else
                return (int)MediaInfo_Open(Handle, FileName);
        }
        public int Open_Buffer_Init(Int64 File_Size, Int64 File_Offset)
        {
            return (int)MediaInfo_Open_Buffer_Init(Handle, File_Size, File_Offset);
        }
        public int Open_Buffer_Continue(IntPtr Buffer, IntPtr Buffer_Size)
        {
            return (int)MediaInfo_Open_Buffer_Continue(Handle, Buffer, Buffer_Size);
        }
        public Int64 Open_Buffer_Continue_GoTo_Get()
        {
            return (int)MediaInfo_Open_Buffer_Continue_GoTo_Get(Handle);
        }
        public int Open_Buffer_Finalize()
        {
            return (int)MediaInfo_Open_Buffer_Finalize(Handle);
        }
        public void Close() { MediaInfo_Close(Handle); }
        public String Inform()
        {
            if (MustUseAnsi)
                return Marshal.PtrToStringAnsi(MediaInfoA_Inform(Handle, (IntPtr)0));
            else
                return Marshal.PtrToStringUni(MediaInfo_Inform(Handle, (IntPtr)0));
        }
        public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch)
        {
            if (MustUseAnsi)
            {
                IntPtr Parameter_Ptr=Marshal.StringToHGlobalAnsi(Parameter);
                String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter_Ptr, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch));
                Marshal.FreeHGlobal(Parameter_Ptr);
                return ToReturn;
            }
            else
                return Marshal.PtrToStringUni(MediaInfo_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch));
        }
        public String Get(StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo)
        {
            if (MustUseAnsi)
                return Marshal.PtrToStringAnsi(MediaInfoA_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo));
            else
                return Marshal.PtrToStringUni(MediaInfo_GetI(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo));
        }
        public String Option(String Option, String Value)
        {
            if (MustUseAnsi)
            {
                IntPtr Option_Ptr=Marshal.StringToHGlobalAnsi(Option);
                IntPtr Value_Ptr=Marshal.StringToHGlobalAnsi(Value);
                String ToReturn=Marshal.PtrToStringAnsi(MediaInfoA_Option(Handle, Option_Ptr, Value_Ptr));
                Marshal.FreeHGlobal(Option_Ptr);
                Marshal.FreeHGlobal(Value_Ptr);
                return ToReturn;
            }
            else
                return Marshal.PtrToStringUni(MediaInfo_Option(Handle, Option, Value));
        }
        public int State_Get() { return (int)MediaInfo_State_Get(Handle); }
        public int Count_Get(StreamKind StreamKind, int StreamNumber) { return (int)MediaInfo_Count_Get(Handle, (IntPtr)StreamKind, (IntPtr)StreamNumber); }
        private IntPtr Handle;
        private bool MustUseAnsi;

        //Default values, if you know how to set default values in C#, say me
        public String Get(StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); }
        public String Get(StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); }
        public String Get(StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(StreamKind, StreamNumber, Parameter, InfoKind.Text); }
        public String Option(String Option_) { return Option(Option_, ""); }
        public int Count_Get(StreamKind StreamKind) { return Count_Get(StreamKind, -1); }
    }

















    public class MediaInfoList
    {
        //Import of DLL functions. DO NOT USE until you know what you do (MediaInfo DLL do NOT use CoTaskMemAlloc to allocate memory)  
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_New();
        [DllImport("MediaInfo.dll")]
        private static extern void MediaInfoList_Delete(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Open(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string FileName, IntPtr Options);
        [DllImport("MediaInfo.dll")]
        private static extern void MediaInfoList_Close(IntPtr Handle, IntPtr FilePos);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Inform(IntPtr Handle, IntPtr FilePos, IntPtr Reserved);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_GetI(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber, IntPtr Parameter, IntPtr KindOfInfo);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Get(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber, [MarshalAs(UnmanagedType.LPWStr)] string Parameter, IntPtr KindOfInfo, IntPtr KindOfSearch);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Option(IntPtr Handle, [MarshalAs(UnmanagedType.LPWStr)] string Option, [MarshalAs(UnmanagedType.LPWStr)] string Value);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_State_Get(IntPtr Handle);
        [DllImport("MediaInfo.dll")]
        private static extern IntPtr MediaInfoList_Count_Get(IntPtr Handle, IntPtr FilePos, IntPtr StreamKind, IntPtr StreamNumber);

        //MediaInfo class
        public MediaInfoList() { Handle = MediaInfoList_New(); }
        ~MediaInfoList() { MediaInfoList_Delete(Handle); }
        public int Open(String FileName, InfoFileOptions Options) { return (int)MediaInfoList_Open(Handle, FileName, (IntPtr)Options); }
        public void Close(int FilePos) { MediaInfoList_Close(Handle, (IntPtr)FilePos); }
        public String Inform(int FilePos) { return Marshal.PtrToStringUni(MediaInfoList_Inform(Handle, (IntPtr)FilePos, (IntPtr)0)); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo, InfoKind KindOfSearch) { return Marshal.PtrToStringUni(MediaInfoList_Get(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber, Parameter, (IntPtr)KindOfInfo, (IntPtr)KindOfSearch)); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, int Parameter, InfoKind KindOfInfo) { return Marshal.PtrToStringUni(MediaInfoList_GetI(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber, (IntPtr)Parameter, (IntPtr)KindOfInfo)); }
        public String Option(String Option, String Value) { return Marshal.PtrToStringUni(MediaInfoList_Option(Handle, Option, Value)); }
        public int State_Get() { return (int)MediaInfoList_State_Get(Handle); }
        public int Count_Get(int FilePos, StreamKind StreamKind, int StreamNumber) { return (int)MediaInfoList_Count_Get(Handle, (IntPtr)FilePos, (IntPtr)StreamKind, (IntPtr)StreamNumber); }
        private IntPtr Handle;

        //Default values, if you know how to set default values in C#, say me
        public void Open(String FileName) { Open(FileName, 0); }
        public void Close() { Close(-1); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter, InfoKind KindOfInfo) { return Get(FilePos, StreamKind, StreamNumber, Parameter, KindOfInfo, InfoKind.Name); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, String Parameter) { return Get(FilePos, StreamKind, StreamNumber, Parameter, InfoKind.Text, InfoKind.Name); }
        public String Get(int FilePos, StreamKind StreamKind, int StreamNumber, int Parameter) { return Get(FilePos, StreamKind, StreamNumber, Parameter, InfoKind.Text); }
        public String Option(String Option_) { return Option(Option_, ""); }
        public int Count_Get(int FilePos, StreamKind StreamKind) { return Count_Get(FilePos, StreamKind, -1); }
    }

} //NameSpace

Answer 2

只需将"MediaInfo.dll“添加到文件夹"YourVisualStudioProjectPath\bin\Debug\”(来自调试创建的VisualStudio；编译后的"*.exe“文件在那里...)