将 C# 托管结构/类与 Windows API 结合使用

发布于 2024-09-26 05:54:29 字数 372 浏览 6 评论 0原文

我厌倦了使用 Marshal.Copy、Marshal.Read* 和 Marshal.Write* 所以我想知道是否有办法强制非托管内存指针（IntPtr 类型）的转换。

像这样的事情：

IntPtr pointer = Marshal.AllocateHGlobal(sizeof(Foo));
Foo bar = (Foo)pointer;
bar.fooBar = someValue;
// call some API
Marshal.FreeHGlobal(pointer);
bar = null; // would be necessary?

原文

I'm sick of using Marshal.Copy, Marshal.Read* and Marshal.Write* so I was wondering if there's a way to force casting of an unmanaged memory pointer (of type IntPtr).

Something like this:

IntPtr pointer = Marshal.AllocateHGlobal(sizeof(Foo));
Foo bar = (Foo)pointer;
bar.fooBar = someValue;
// call some API
Marshal.FreeHGlobal(pointer);
bar = null; // would be necessary?

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缱绻入梦 2024-10-03 05:54:29

我相信您正在寻找 Marshal.PtrToStructure 和 Marshal.StructureToPtr。那里的示例代码演示了用法：

Point p;
p.x = 1;
p.y = 1;

Console.WriteLine("The value of first point is " + p.x +
                  " and " + p.y + ".");

// Initialize unmanged memory to hold the struct.
IntPtr pnt = Marshal.AllocHGlobal(Marshal.SizeOf(p));

try
{

    // Copy the struct to unmanaged memory.
    Marshal.StructureToPtr(p, pnt, false);

    // Create another point.
    Point anotherP;

    // Set this Point to the value of the 
    // Point in unmanaged memory. 
    anotherP = (Point)Marshal.PtrToStructure(pnt, typeof(Point));

    Console.WriteLine("The value of new point is " + anotherP.x +
                      " and " + anotherP.y + ".");

}
finally
{
    // Free the unmanaged memory.
    Marshal.FreeHGlobal(pnt);
}

I believe you're after Marshal.PtrToStructure and Marshal.StructureToPtr. The sample code there demonstrates the use:

Point p;
p.x = 1;
p.y = 1;

Console.WriteLine("The value of first point is " + p.x +
                  " and " + p.y + ".");

// Initialize unmanged memory to hold the struct.
IntPtr pnt = Marshal.AllocHGlobal(Marshal.SizeOf(p));

try
{

    // Copy the struct to unmanaged memory.
    Marshal.StructureToPtr(p, pnt, false);

    // Create another point.
    Point anotherP;

    // Set this Point to the value of the 
    // Point in unmanaged memory. 
    anotherP = (Point)Marshal.PtrToStructure(pnt, typeof(Point));

    Console.WriteLine("The value of new point is " + anotherP.x +
                      " and " + anotherP.y + ".");

}
finally
{
    // Free the unmanaged memory.
    Marshal.FreeHGlobal(pnt);
}

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