将HWND转换为IntPtr(CLI)

Question

我的C++ MFC代码中有一个HWND,我想将这个HWND传递给C#控件并将其作为IntPtr.

我的代码有什么问题,我该怎么做才能正确？(我认为这是使用CLI指针的错误,因为我得到一个错误,它无法从System :: IntPtr ^转换为System :: IntPtr.但我不知道如何让它完全正常工作. ..)

我的C++ MFC代码:

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

我的C#代码:

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);
    }

当前发生错误(无法从IntPtr ^转换为IntPtr) m_pManagedData->CSharpControl->UpdateHandle(managedhWnd);

如果我将CLI代码更改为:

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);
    }

所以在这种情况下,C#中获得的值为0.

我怎样才能让它正常工作？

Answer 1

要从HWND(只是一个指针)转换为IntPtr,你只需要调用它的构造函数,你就不需要gcnew,因为它是一个值类型.所以这应该可以将HWND从native传递给managed:

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

这是一个可以从托管代码调用并从本机代码中获取本机HWND的函数:

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