使用 UnmanagedExports 显示和关闭 c# 窗体 c++

Question

我需要显示带有消息的 C# 窗体 'Please wait'，然后在后台执行其他任务。当这些额外的任务完成后，我必须 hide/close 该表格。我在 C++ 控制台应用程序中这样做。我正在调用函数来显示和关闭窗体，这些窗体在 C# 中定义并使用 UnmanagedExports 公开。问题是表单没有正确显示（所有控件都没有加载），当光标放在表单上时它显示加载状态。如何正确显示表单、执行任务然后关闭表单？

C++代码：

using CSharpFormShow = void(__stdcall *)(HWND hwnd, wchar_t* message);
using CSharpFormClose = void(__stdcall *)();
int _tmain(int argc, _TCHAR* argv[])
{
    HMODULE mod = LoadLibraryA("CSharp.dll");
    CSharpFormShow formShow = reinterpret_cast<CSharpFormShow>(GetProcAddress(mod, "formshow"));
    CSharpFormClose formClose = reinterpret_cast<CSharpFormClose>(GetProcAddress(mod, "formclose"));
    formShow(hwnd,L"This is a message");
    //perform some tasks
    formClose();
    getchar();
    return 0;
}

C#代码：

[DllExport(ExportName = "formshow", CallingConvention = CallingConvention.StdCall)]
public static void showForm(IntPtr owner, [MarshalAs(UnmanagedType.LPWStr)]string message)
{
    NativeWindow nativeWindow = new NativeWindow();
    nativeWindow.AssignHandle(owner);
    Form_Wait form = new Form_Wait();
    form.label_message.Text = message;
    form.Show(nativeWindow);
}
[DllExport(ExportName = "formclose", CallingConvention = CallingConvention.StdCall)]
public static void closeForm()
{
    form.Dispose();
}

Answer 1

我通过添加 Application.DoEvents(); 设法解决了这个问题；在 form.show() 之后；现在它工作正常并且表格显示正确。现在最终的 showForm c# 代码变为：

NativeWindow nativeWindow = new NativeWindow();
nativeWindow.AssignHandle(owner);
Form_Wait form = new Form_Wait();
form.label_message.Text = message;
form.Show(nativeWindow);
Application.DoEvents();

此致

使用 UnmanagedExports 显示和关闭 c# 窗体 c++

display and close c# form c++ using UnmanagedExports

c#

c++

forms

winforms

unmanagedexports