转换为HWND的IntPtr（CLI） [英] Convert HWND to IntPtr (CLI)

问题描述

我有一个HWND在我的C ++ MFC代码，我想这HWND传递给一个C＃的控制，并把它作为IntPtr的。

I have a HWND in my C++ MFC code, and I want to pass this HWND to a C# control and get it as IntPtr.

什么是错误的，我代码，我怎么能正确地做到这一点？
（我认为这是一些与错误使用CLI指针，因为我得到一个错误，它不能从系统转换:: IntPtr的^到System :: IntPtr的，但我不知道究竟如何使这一切正常工作......）

What Is wrong in my code, and how can I do it correctly? (I think it's something with wrong using of the CLI pointers, because I get an error that it cannot convert from System::IntPtr^ to System::IntPtr. But I don't know how exactly to make it all to work properly...)

我的C ++ MFC代码：

My C++ MFC code:

HWND myHandle= this->GetSafeHwnd();
m_CLIDialog->UpdateHandle(myHandle);

我的C＃代码：

My C# code:

public void UpdateHandle(IntPtr mHandle)
{
   ......
}

我的CLI代码：

void CLIDialog::UpdateHandle(HWND hWnd)
{
   System::IntPtr^ managedhWnd = gcnew System::IntPtr();
   HWND phWnd; // object on the native heap

   try
   {

       phWnd = (HWND)managedhWnd->ToPointer();
        *phWnd = *hWnd; //Deep-Copy the Native input object to Managed wrapper.

       m_pManagedData->CSharpControl->UpdateHandle(managedhWnd);
    }

错误（不能从IntPtr的^到IntPtr的转换）目前发生在 m_pManagedData-> CSharpControl-> UpdateHandle（managedhWnd）;

如果我更改了CLI代码：

if I change the CLI code to:

void CLIDialog::UpdateHandle(HWND hWnd)
{
   System::IntPtr managedhWnd;
   HWND phWnd; // object on the native heap

   try
   {

       phWnd = (HWND)managedhWnd.ToPointer();
        *phWnd = *hWnd; //Deep-Copy the Native input object to Managed wrapper.

       m_pManagedData->CSharpControl->UpdateHandle(managedhWnd);
    }

因此​​，在这种情况下，在C＃中得到的值是0。

So in this case the value gotten in C# is 0.

我怎样才能使其正常工作？

How can I make it work properly?

推荐答案

要从HWND转换（其中只是一个指针）IntPtr的，你只需要调用它的构造函数，你不需要gcnew，因为它是值类型。
所以这应该努力从本地一个HWND传递给管理：

To convert from HWND (which is just a pointer) to IntPtr you just have to invoke it's constructor, and you do not need gcnew as it's a value type. So this should work to pass a HWND from native to managed:

void CLIDialog::UpdateHandle( HWND hWnd )
{
  IntPtr managedHWND( hwnd );
  m_pManagedData->CSharpControl->UpdateHandle( managedHWND );
}

这是你可以从托管代码调用并获得本地HWND的函数从本机代码：

And this is a function you can invoke from managed code and get a native HWND from in native code:

void SomeManagedFunction( IntPtr hWnd )
{
  HWND nativeHWND = (HWND) hWnd.ToPointer();
  //...
}

这篇关于转换为HWND的IntPtr（CLI）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！