我正在尝试使用 .Net Core 订阅窗口消息
我能够接收初始消息以创建一个窗口（通过 pinvoke）并销毁消息。但在那之后我创建的窗口被阻止并且没有收到任何其他消息。
public class CustomWindow : IDisposable
{
delegate IntPtr WndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
[StructLayout(LayoutKind.Sequential,CharSet = CharSet.Unicode)]
struct WNDCLASS
{
public uint style;
public IntPtr lpfnWndProc;
public int cbClsExtra;
public int cbWndExtra;
public IntPtr hInstance;
public IntPtr hIcon;
public IntPtr hCursor;
public IntPtr hbrBackground;
[MarshalAs(UnmanagedType.LPWStr)]
public string lpszMenuName;
[MarshalAs(UnmanagedType.LPWStr)]
public string lpszClassName;
}
[StructLayout(LayoutKind.Sequential)]
public struct MSG
{
public IntPtr hwnd;
public uint message;
public IntPtr wParam;
public IntPtr lParam;
public uint time;
}
[DllImport("user32.dll", SetLastError = true)]
static extern UInt16 RegisterClassW([In] ref WNDCLASS lpWndClass);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr CreateWindowExW(
UInt32 dwExStyle,
[MarshalAs(UnmanagedType.LPWStr)]string lpClassName,
[MarshalAs(UnmanagedType.LPWStr)]string lpWindowName,
UInt32 dwStyle,
Int32 x,
Int32 y,
Int32 nWidth,
Int32 nHeight,
IntPtr hWndParent,
IntPtr hMenu,
IntPtr hInstance,
IntPtr lpParam
);
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr DefWindowProcW(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", SetLastError = true)]
static extern bool DestroyWindow(IntPtr hWnd);
private const int ERROR_CLASS_ALREADY_EXISTS = 1410;
private bool _mDisposed;
public IntPtr Hwnd;
public List<uint> Messages { get; set; }
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
if (!_mDisposed)
{
if (disposing)
{
// Dispose managed resources
}
// Dispose unmanaged resources
if (Hwnd != IntPtr.Zero)
{
DestroyWindow(Hwnd);
Hwnd = IntPtr.Zero;
}
}
}
public CustomWindow()
{
Messages = new List<uint>();
var className = "InvisibleWindow";
_mWndProcDelegate = CustomWndProc;
// Create WNDCLASS
WNDCLASS windClass = new WNDCLASS
{
lpszClassName = className,
lpfnWndProc = Marshal.GetFunctionPointerForDelegate(_mWndProcDelegate)
};
UInt16 classAtom = RegisterClassW(ref windClass);
int lastError = Marshal.GetLastWin32Error();
if (classAtom == 0 && lastError != ERROR_CLASS_ALREADY_EXISTS)
{
throw new Exception("Could not register window class");
}
const UInt32 WS_OVERLAPPEDWINDOW = 0xcf0000;
const UInt32 WS_VISIBLE = 0x10000000;
// Create window
Hwnd = CreateWindowExW(
0,
className,
"My WIndow",
WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0, 0, 300, 400,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero,
IntPtr.Zero
);
Importer.ShowWindow(Hwnd, 1);
Importer.UpdateWindow(Hwnd);
}
private IntPtr CustomWndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
{
Messages.Add(msg);
return DefWindowProcW(hWnd, msg, wParam, lParam);
}
private WndProc _mWndProcDelegate;
}
类创建自定义窗口CustomWndProc 接收消息。我还没有在那里执行任何逻辑，只是想让事情正常进行。
我试图弄清楚如何从一个单独的线程中执行此操作，以便在不阻塞主 api/gui/console 接口的同时继续收听消息
我可以在单独的线程中创建这个类并且仍然使用依赖注入并且可以随心所欲地访问它的数据/消息/事件。我知道在 .net 中有很多方法可以做到这一点，但这是 .net Core。
否决票是怎么回事，实际上没有资源如何在 Net Core 中实现这一点，我无法访问任何简化这一点的 .Net 表单/控件，我还提供了完整的工作类，如果缺乏细节在我的帖子中，发表评论。不要在没有充分理由的情况下随机投票。如果有另一个线程解释了如何做到这一点，链接它，然后投反对票。
private void GetMessage()
{
IntPtr hwnd = _customWindow.Hwnd;
int bRet;
while ((bRet = Importer.GetMessage(out var msg, _customWindow.GetHandle, 0, 0)) !=0 )
{
if (bRet == -1)
{
Console.WriteLine("Error");
}
else
{
Importer.TranslateMessage(ref msg);
Importer.DispatchMessage(ref msg);
Console.WriteLine(_customWindow.Messages.LastOrDefault());
}
}
}
实现了 GetMessage 循环，我的窗口现在接收所有消息并且没有被阻塞，但它现在阻塞了主线程。我会看看我是否可以在单独的线程上创建窗口并在该线程上运行消息循环。