asp.net调用vc dll_asp net core 调用c dll-优快云博客

本文链接：https://blog.youkuaiyun.com/codetian/article/details/2971689

本文展示了如何在ASP.NET中通过DllImport调用来加载和使用两个DLL（Decrypt.dll和DES3.DLL）。代码创建了一个DllInvoke类，用于加载DLL并执行指定函数，然后在DecryptCommon类中定义委托并调用解密函数。提供了两种解密方法：一种返回解密后的字符串，另一种返回解密结果的布尔值。

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public class DllInvoke
{
[DllImport("kernel32.dll")]
private extern static IntPtr LoadLibrary(String path);

[DllImport("kernel32.dll")]
private extern static IntPtr GetProcAddress(IntPtr lib,String funcName);

[DllImport("kernel32.dll")]
private extern static bool FreeLibrary(IntPtr lib);

private IntPtr hLib;

    public DllInvoke(String DLLPath1,String DLLPath2)
    {
        LoadLibrary(DLLPath2);
        hLib = LoadLibrary(DLLPath1);
    }

    ~DllInvoke()
    {
        FreeLibrary(hLib);
    }

    //将要执行的函数转换为委托
    public Delegate Invoke(String APIName,Type t)
    {
        IntPtr api = GetProcAddress(hLib,APIName);
        return (Delegate)Marshal.GetDelegateForFunctionPointer(api,t);
    }
}

//使用

public class DecryptCommon
{
public delegate bool Decrypt(StringBuilder encryptKey, StringBuilder outKey);

    public DecryptCommon()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public static bool getDecrypt(StringBuilder encryptKey, out StringBuilder outKey)
    {
        DllInvoke dll = new DllInvoke(System.Web.HttpContext.Current.Server.MapPath(@"~/Bin/Decrypt.dll"), System.Web.HttpContext.Current.Server.MapPath(@"~/Bin/DES3.DLL"));
        Decrypt decrypt = (Decrypt)dll.Invoke("Decrypt", typeof(Decrypt));
        outKey =new StringBuilder(20);
        return decrypt(encryptKey, outKey);
    }

    //解密
    public static string getMiMa(string encryptKey)
    {
        StringBuilder sbEncryptKey = new StringBuilder();
        sbEncryptKey.Append(encryptKey);

StringBuilder value = null;

        getDecrypt(sbEncryptKey, out value);
        return value.ToString();
    }

    //解密
    public static bool getMiMaBool(string encryptKey)
    {
        StringBuilder sbEncryptKey = new StringBuilder();
        sbEncryptKey.Append(encryptKey);

StringBuilder value = null;

return getDecrypt(sbEncryptKey, out value);
}
}

从网上找到了上面的代码，要是一个dll调用另外一个dll 怎么办呢，注意红色部分