WPF和非托管库加载 [英] WPF and unmanaged library loading

问题描述

最近，我遇到了一个非常奇怪的问题.
我编写了一个WPF程序，该程序与Infineon的DLL进行交互.
一切都按预期工作，但是在某个时候，我无处获得了堆栈溢出异常.

我开始确定该问题(您看到异常来自WindowsBase.dll)，并且看到该问题仅在加载特定的DLL文件(通过kernel32 LoadLibrary函数)时发生.
例如，下面的代码将导致异常发生(尽管LoadLibrary函数返回没有错误，然后我可以使用该句柄了):

Recentrly I came across a very strange problem.
I wrote a WPF program which interacts with a DLL from Infineon.
Everything worked as expected, but at some point, I got a stack overflow exception from nowhere.

I started nailing down the issue (you see the exception comes out of WindowsBase.dll), and saw the issue only happens if I load a specific DLL file (via kernel32 LoadLibrary function).

The following piece of code, for example, will cause the exception to happen (although the LoadLibrary function returns with no error, and I can then use the handle):

///
/// Interaction logic for MainWindow.xaml
///
public partial class MainWindow : Window
{
    [DllImport("kernel32.dll")]
    public static extern IntPtr LoadLibrary(string dllToLoad);

    public MainWindow()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        IntPtr handle = LoadLibrary("dwdiow.dll");
    }
}

在此示例中，退出button1_Click()并在一段时间后出现异常.

如果我对Windows窗体或控制台项目(而不是WPF)执行相同的操作，则不会显示错误.

请帮忙！

In this example, the button1_Click() is exited and after some time the excption comes.

If I do the very same thing with a windows form or console projects (instead of WPF), the error does not show up.

Please help!

推荐答案

尝试使用LoadLibraryEx代替:

Try using LoadLibraryEx instead:

[DllImport("kernel32.dll", CharSet=CharSet::Auto, EntryPoint="LoadLibraryEx")]
private static extern IntPtr LoadLibraryEx(string lpFileName, IntPtr hFile, uint dwFlags);

System.IntPtr moduleHandle = LoadLibraryEx(libPath, IntPtr.Zero, 0);

您需要向我们提供有关异常的更多信息，尤其是异常发生的对象/方法.实际上，您可能还想在MSDN WPF论坛上问这个问题.

You need to give us more info on the exception, specifically what opject/method it''s happening on. In fact, you might also want to ask this question on the MSDN WPF forum.

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