从C#调用MsiEnumRelatedProducts崩溃 [英] Calling MsiEnumRelatedProducts from C# is crashing

问题描述

我从C#调用MsiEnumRelatedProducts一直没有麻烦.我已经尝试了一些关于p/invoke定义的变体，但是没有运气(out和ref).我认为问题是最后一个参数，它是一个LPTSTR，应该指向39个字符长的字符串.

I'm having no end of trouble calling MsiEnumRelatedProducts from C#. I've tried a couple of variations on the p/invoke definition but no luck (out and ref). I think the problem is the last parameter, which is an LPTSTR that is supposed to point to a string 39 characters long.

这是拨打电话的电话:

public static string EnumRelatedProducts(string UpgradeCode, int Index)
{
    string ProductCode;
    UInt32 rc = MsiEnumRelatedProducts(UpgradeCode, 0, Index, out ProductCode);
    Console.WriteLine("Returned");
    if (rc != 0)
    {
        return string.Empty;
    }

    return ProductCode;
}

[DllImport("msi.dll", CharSet = CharSet.Auto)]
private static extern UInt32 MsiEnumRelatedProducts(string UpgradeCode, int reserved, int Index, out string ProductCode);

请注意，只有在传递的UpgradeCode至少安装了1个产品时，才会发生崩溃.

Note that the crash only occurs when the passed UpgradeCode has at least 1 installed product.

推荐答案

尝试这样声明:

[DllImport("msi.dll")]
private static extern uint MsiEnumRelatedProducts(
             string lpUpgradeCode, 
             uint dwReserved, 
             uint lProductIndex, 
             StringBuilder lpProductBuf);

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