启用代码优化选项时应用程序崩溃

发布于 2024-09-09 17:10:56 字数 977 浏览 2 评论 0原文

我遇到以下问题：

我正在开发一个 C# 应用程序，它需要不安全的代码来调用非托管 C++ 函数。结构是：

[StructLayout(LayoutKind.Sequential)]
unsafe struct DataStruct
{
    public UInt16 index;
    public UInt16 response;
    public byte* addr; //this is a pointer to a byte array which stores some some data.
}

这就是我导入函数的方式：

[DllImport("imagedrv.dll", EntryPoint = "SendCommand", ExactSpelling = false, CallingConvention = CallingConvention.Cdecl)]
private static extern int SendCommand([MarshalAs(UnmanagedType.Struct, SizeConst = 8)]ref DataStruct s);

从线程成功调用该函数，我得到了预期的结果，但问题是每当我与 Windows.Form 表单交互时，整个应用程序就会崩溃。如果我将鼠标移到它上面或与我的 contextmenustrip 控件交互并不重要。如果我不与表单交互，程序就可以正常运行。

调用示例：

DataStruct s;
byte[] buffer = new byte[512];

s.index = 0x03;
s.response = 0;
fixed (byte* pBuffer = buffer) s.addr = pBuffer;
System.Console.WriteLine(SendCommand(ref s));

奇怪的是，如果我在项目属性中禁用代码优化选项，程序运行正常！

可能会发生什么？

原文

I'm having the following problem:

I'm developing a C# application which requires unsafe code to call an unmanaged c++ function. The structure is:

[StructLayout(LayoutKind.Sequential)]
unsafe struct DataStruct
{
    public UInt16 index;
    public UInt16 response;
    public byte* addr; //this is a pointer to a byte array which stores some some data.
}

And this is how I import the function:

[DllImport("imagedrv.dll", EntryPoint = "SendCommand", ExactSpelling = false, CallingConvention = CallingConvention.Cdecl)]
private static extern int SendCommand([MarshalAs(UnmanagedType.Struct, SizeConst = 8)]ref DataStruct s);

The function is being called from a thread sucessfully and I get the expected results but the problem is whenever I interact with my Windows.Form form, the whole application crashes. It doesn't matter if I move the mouse over it or I interact with my contextmenustrip control. If I don't interact with the form, the program runs fine.

Example of call:

DataStruct s;
byte[] buffer = new byte[512];

s.index = 0x03;
s.response = 0;
fixed (byte* pBuffer = buffer) s.addr = pBuffer;
System.Console.WriteLine(SendCommand(ref s));

The weird thing is if I disable the code optimization option in my project properties, the program runs fine!

What could be happenning?

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蘸点软妹酱 2024-09-16 17:10:56

尝试将 SendCommand 调用移动到固定块内：

DataStruct s;
byte[] buffer = new byte[512];

s.index = 0x03;
s.response = 0;
fixed (byte* pBuffer = buffer) {
    s.addr = pBuffer;
    System.Console.WriteLine(SendCommand(ref s));
}

否则，事情可能会在您意想不到的情况下移动。

Try moving the SendCommand call inside the fixed block:

DataStruct s;
byte[] buffer = new byte[512];

s.index = 0x03;
s.response = 0;
fixed (byte* pBuffer = buffer) {
    s.addr = pBuffer;
    System.Console.WriteLine(SendCommand(ref s));
}

Otherwise, things could move around without you expecting it.

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