C++/CLI 在运行时显式加载托管 DLL(相当于非托管的 LoadLibrary)
问题 1:
有没有办法在 C++/CLI 中在运行时而不是在编译时显式加载库。目前我在编译时使用.NET“添加引用”。 我想显式加载托管 dll。 .NET 中是否有 LoadLibrary 的等效项?
更新: 感谢
MSDN 中的 Randolpho Assembly::LoadFrom 示例
Assembly^ SampleAssembly;
SampleAssembly = Assembly::LoadFrom( "c:\\Sample.Assembly.dll" );
// Obtain a reference to a method known to exist in assembly.
MethodInfo^ Method = SampleAssembly->GetTypes()[ 0 ]->GetMethod( "Method1" );
// Obtain a reference to the parameters collection of the MethodInfo instance.
array<ParameterInfo^>^ Params = Method->GetParameters();
// Display information about method parameters.
// Param = sParam1
// Type = System::String
// Position = 0
// Optional=False
for each ( ParameterInfo^ Param in Params )
{
Console::WriteLine( "Param= {0}", Param->Name );
Console::WriteLine( " Type= {0}", Param->ParameterType );
Console::WriteLine( " Position= {0}", Param->Position );
Console::WriteLine( " Optional= {0}", Param->IsOptional );
}
问题 2:
如果 Assembly::LoadFrom 是 LoadLibrary 的 .NET 等效项。 GetProcAddress 的等价物是什么?如何创建指向方法的函数指针?
更新: 来自 MSDN 的 MethodBase.Invoke
using namespace System;
using namespace System::Reflection;
public ref class MagicClass
{
private:
int magicBaseValue;
public:
MagicClass()
{
magicBaseValue = 9;
}
int ItsMagic(int preMagic)
{
return preMagic * magicBaseValue;
}
};
public ref class TestMethodInfo
{
public:
static void Main()
{
// Get the constructor and create an instance of MagicClass
Type^ magicType = Type::GetType("MagicClass");
ConstructorInfo^ magicConstructor = magicType->GetConstructor(Type::EmptyTypes);
Object^ magicClassObject = magicConstructor->Invoke(gcnew array<Object^>(0));
// Get the ItsMagic method and invoke with a parameter value of 100
MethodInfo^ magicMethod = magicType->GetMethod("ItsMagic");
Object^ magicValue = magicMethod->Invoke(magicClassObject, gcnew array<Object^>(1){100});
Console::WriteLine("MethodInfo.Invoke() Example\n");
Console::WriteLine("MagicClass.ItsMagic() returned: {0}", magicValue);
}
};
int main()
{
TestMethodInfo::Main();
}
Problem 1:
Is there a way to explicitly load a library at runtime instead of at compile time in C++/CLI. Currently I am using the .NET "Add Reference" at compile time.
I would like to explicitly load a managed dll. Is there the .NET equivalent of LoadLibrary?
Update: Thanks to Randolpho
Assembly::LoadFrom example from MSDN
Assembly^ SampleAssembly;
SampleAssembly = Assembly::LoadFrom( "c:\\Sample.Assembly.dll" );
// Obtain a reference to a method known to exist in assembly.
MethodInfo^ Method = SampleAssembly->GetTypes()[ 0 ]->GetMethod( "Method1" );
// Obtain a reference to the parameters collection of the MethodInfo instance.
array<ParameterInfo^>^ Params = Method->GetParameters();
// Display information about method parameters.
// Param = sParam1
// Type = System::String
// Position = 0
// Optional=False
for each ( ParameterInfo^ Param in Params )
{
Console::WriteLine( "Param= {0}", Param->Name );
Console::WriteLine( " Type= {0}", Param->ParameterType );
Console::WriteLine( " Position= {0}", Param->Position );
Console::WriteLine( " Optional= {0}", Param->IsOptional );
}
Problem 2:
If Assembly::LoadFrom is the .NET equivalent of LoadLibrary. What is the equivalent of GetProcAddress? How do I create FunctionPointers to the methods?
Update: MethodBase.Invoke from MSDN
using namespace System;
using namespace System::Reflection;
public ref class MagicClass
{
private:
int magicBaseValue;
public:
MagicClass()
{
magicBaseValue = 9;
}
int ItsMagic(int preMagic)
{
return preMagic * magicBaseValue;
}
};
public ref class TestMethodInfo
{
public:
static void Main()
{
// Get the constructor and create an instance of MagicClass
Type^ magicType = Type::GetType("MagicClass");
ConstructorInfo^ magicConstructor = magicType->GetConstructor(Type::EmptyTypes);
Object^ magicClassObject = magicConstructor->Invoke(gcnew array<Object^>(0));
// Get the ItsMagic method and invoke with a parameter value of 100
MethodInfo^ magicMethod = magicType->GetMethod("ItsMagic");
Object^ magicValue = magicMethod->Invoke(magicClassObject, gcnew array<Object^>(1){100});
Console::WriteLine("MethodInfo.Invoke() Example\n");
Console::WriteLine("MagicClass.ItsMagic() returned: {0}", magicValue);
}
};
int main()
{
TestMethodInfo::Main();
}
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查看 http://www.informit.com/articles/article.aspx? p=25948 有关反射的信息。可能是您正在寻找的票(在不了解更多问题的情况下,很难说)
它有一整节关于动态加载程序集并探测它们以找出方法和属性之类的内容。
Check out http://www.informit.com/articles/article.aspx?p=25948 for information about Reflection. Might be the ticket you're looking for (without knowing more of the issue, it's hard to say)
It has a whole section about dynamically loading assemblies and probing them to find out methods and properties and whatnot.
你说的是托管 DLL吗?然后你需要
Assembly::Load
Did you say managed DLL? Then you want
Assembly::Load