我试图使用指向托管对象的指针从非托管函数触发事件。我收到以下错误:
错误C3767:
'ShashiTest::test::OnShowResult::raise'
:候选函数无法访问
我怎么能没有任何问题地调用常规函数ShowMessage?
#pragma once
#using<mscorlib.dll>
#using<System.Windows.Forms.dll>
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Diagnostics;
using namespace System::Windows::Forms;
namespace ShashiTest {
public delegate void ShowResult(System::String^);
public ref class test
{
public:
event ShowResult^ OnShowResult;
test(void)
{
};
void ShowMessage()
{
MessageBox::Show("Hello World");
}
};
class ManagedInterface
{
public:
gcroot<test^> m_test;
ManagedInterface(){};
~ManagedInterface(){};
void ResultWindowUpdate(std::string ResultString);
};
}
void ShashiTest::ManagedInterface::ResultWindowUpdate(std::string ResultString)
{
if(m_test)
{
System::String ^result = gcnew system::String(ResultString.c_str());
m_test->OnShowResult(result);
}
}
答案 0 :(得分:1)
您可以通过手动定义事件并将raise()
部分的访问级别更改为internal
或public
来执行此操作。 (默认值为protected
或private
- 有关详细信息,请参阅http://social.msdn.microsoft.com/forums/en-US/vclanguage/thread/ff743ebd-dba9-48bc-a62a-1e65aab6f2f9处的ildjarn帖子。)
以下为我编译:
public ref class test
{
public:
event ShowResult^ OnShowResult {
void add(ShowResult^ d) {
_showResult += d;
}
void remove(ShowResult^ d) {
_showResult -= d;
}
internal:
void raise(System::String^ str) {
if (_showResult) {
_showResult->Invoke(str);
}
}
};
test(void)
{
};
void ShowMessage()
{
MessageBox::Show("Hello World");
}
private:
ShowResult^ _showResult;
};
另一种方法是定义一个可以触发事件的辅助函数。