Inno Setup-具有依赖项的外部.NET DLL

问题描述

我正在尝试在安装过程中在Inno Setup脚本中使用自定义DLL。我编写了一个非常简单的函数，该函数基本上使用MySQL .NET连接器检查MySQL数据库的连接字符串（目标服务器上没有MySQL客户端）。此导出函数的代码为：

I am trying to use a custom DLL in a Inno Setup script during installation. I wrote a very simple function that basically checks a connection string for a MySQL database using MySQL .NET connector (there is no MySQL client on the target server). The code of this exported function is:

public class DbChecker
{
    [DllExport("CheckConnexion", CallingConvention.StdCall)]
    public static int CheckConnexion([MarshalAs(UnmanagedType.LPStr)] string connexionString)
    {
        int success;
        try
        {
            MySqlConnection connection = new MySqlConnection(connexionString);
            connection.Open();
            connection.Close();
            success = 0;
        }
        catch (Exception)
        {
            success = 1;
        }
        return success;
    }
}

此函数在Inno Setup中以这种方式导入：

The function is imported this way in Inno Setup :

[Files]
Source: "..\..\MyDll\bin\x86\Release\*"; Flags: dontcopy;

和

[Code]
function CheckConnexion(connexionString: AnsiString): Integer;
external 'CheckConnexion@files:MyDll.dll,MySql.Data.dll stdcall setuponly loadwithalteredsearchpath';`

问题是安装程序在运行时引发异常：

The problem is that the setup throws an exception at runtime:

外部异常E0434352。

External exception E0434352.

我想我必须使用 files 前缀，因为在将文件复制到 {app}之前，该函数在 NextButtonClick 事件处理程序中调用目录。

I think I have to use the files prefix because the function is called in the NextButtonClick event handler, before files are copied to the {app} directory.

MyDll.dll 和 MySql都可以。在运行时将Data.dll 正确提取到 {tmp} 目录。

我尝试使用和不使用 loadwithalteredsearchpath 标志，结果相同。

I tried both with and without the loadwithalteredsearchpath flag with the same result.

我发现这是错误代码是通用的.NET运行时错误代码。

What I found is that this error code is a generic .NET runtime error code.

如果我使用 MySql.Data 删除了该部件，它就可以很好地工作（除了它什么都不做... ）

If I remove the part using MySql.Data it works perfectly fine (except that it does nothing...)

如在其他线程上所建议的那样，我一直尝试使用 EventLog 在.NET代码中记录错误和 UnhandledException ，但是即使没有MySQL部分，无论如何（也没有创建日志源），我都有相同的例外。我检查了计算机上的EventLog权限。

As advised on other threads I've been trying to log the error in my .NET code using EventLog and UnhandledException but I have the same exception no matter what (and no log source is created), even without the MySQL part. I checked EventLog permissions on my computer.

似乎当我使用任何其他基本 C＃代码时，都会引发异常（无论何时尝试加载其他C＃代码） DLL）。

It seems that the exception is thrown as soon as I use anything else that "basic" C# code (whenever I try to load another DLL).

推荐答案

也许有更好的方法，但是这样做可以。

There is probably a better way, but this will do.

实施初始化功能（此处为 Init ），该功能可设置处理程序，用于在主路径中查找程序集（正在执行）程序集：

Implement an initialization function (Init here) that sets up AppDomain.AssemblyResolve handler that looks for an assembly in the path of the main (executing) assembly:

[DllExport("Init", CallingConvention.StdCall)]
public static void Init()
{
    AppDomain currentDomain = AppDomain.CurrentDomain;
    currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
}

private static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args)
{
    string location = Assembly.GetExecutingAssembly().Location;
    AssemblyName name = new AssemblyName(args.Name);
    string path = Path.Combine(Path.GetDirectoryName(location), name.Name + ".dll");
    if (File.Exists(path))
    {
        return Assembly.LoadFrom(path);
    }
    return null;
}

将其导入Inno设置：

Import it to the Inno Setup:

procedure Init(); external 'Init@files:MyDll.dll stdcall setuponly';

然后在调用需要依赖项的函数（ CheckConnexion ）。

And call it before calling the function that needs the dependency (CheckConnexion).

另一个解决方案可能是：

Another solution might be this:
Embedding DLLs in a compiled executable

顺便说一句，不需要 loadwithalteredsearchpath 标志。它对.NET程序集imo无效。

Btw, no need for the loadwithalteredsearchpath flag. It has no effect on .NET assemblies imo.

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