ATL入门

服务端代码------------------------------------------------------------------------------------------------------------------------------------------------------------

altstopwatch.idl [接口定义文件]

// altstopwatch.idl : IDL source for altstopwatch
//

// This file will be processed by the MIDL tool to
// produce the type library (altstopwatch.tlb) and marshalling code.

import "oaidl.idl";
import "ocidl.idl";

[
	object,
	uuid(FD2BE6F3-9074-47F3-9884-FDD3DE13D158),
	pointer_default(unique)
]

//在这里定义接口
interface Istopwatch : IUnknown{

<span style="white-space:pre">	</span>    //相同的属性(都指向同一个成员变量)，ID值相同
<strong><span style="font-size:18px;color:#ff0000;">	[propget, id(1), helpstring("取值")]  HRESULT name ([out ,retval] BSTR *val);
	[propput, id(1), helpstring("设值")]  HRESULT name([in] BSTR val);</span></strong>
};

[
	uuid(A4E51DE3-D343-4CB2-A901-5CE1D2067309),
	version(1.0),
]
library altstopwatchLib
{
	importlib("stdole2.tlb");
	[
		uuid(FD3216FD-B513-40F1-BE2C-72B2954D1368),
		helpstring("help string stopwatch class")
	]
	coclass stopwatch
	{
		[default] interface Istopwatch;
	};
};

stopwatch.h [接口定义头文件]

// stopwatch.h : Declaration of the Cstopwatch

#pragma once
#include "resource.h"       // main symbols

#include "altstopwatch_i.h"

#if defined(_WIN32_WCE) && !defined(_CE_DCOM) && !defined(_CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA)
#error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM object's and allow use of it's single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
#endif

using namespace ATL;

// Cstopwatch

class ATL_NO_VTABLE Cstopwatch :
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<Cstopwatch, &CLSID_stopwatch>,
	public Istopwatch
{
public:
	Cstopwatch()
	{
	}

DECLARE_REGISTRY_RESOURCEID(IDR_STOPWATCH)

BEGIN_COM_MAP(Cstopwatch)
	COM_INTERFACE_ENTRY(Istopwatch)
END_COM_MAP()

	DECLARE_PROTECT_FINAL_CONSTRUCT()

	HRESULT FinalConstruct()
	{
		return S_OK;
	}

	void FinalRelease()
	{
	}

public:

//将接口进行实现
<strong><span style="font-size:18px;color:#ff6600;">public:
	virtual /* [helpstring][id][propget] */ HRESULT STDMETHODCALLTYPE get_name(
		/* [retval][out] */ BSTR *val)
	{
		m_name.CopyTo(val);
		return S_OK;
	}

	virtual /* [helpstring][id][propput] */ HRESULT STDMETHODCALLTYPE put_name(
		/* [in] */ BSTR val)
	{
		m_name.AssignBSTR(val);
		return S_OK;
	}</span></strong>

private:
	CComBSTR m_name;

};

OBJECT_ENTRY_AUTO(__uuidof(stopwatch), Cstopwatch)

###############################################################################################################################

客户端代码

#include <Windows.h>
#include <atlbase.h>
#include <atlcom.h>
#include <stdio.h>

#import "../Debug/altstopwatch.dll" named_guids no_namespace 

void test()
{
	CoInitialize(NULL);

	{
		CComPtr<Istopwatch> ptr ;
		HRESULT hr = ptr.CoCreateInstance(CLSID_stopwatch, NULL, CLSCTX_ALL);
		assert((SUCCEEDED(hr)));

		//由于我之前写成了
		//BSTR s = L"test"
		//所以::SysAllocStringByteLen算出来一直是0 汗啊!!!!!!!!!!!!!!
		BSTR s = ::SysAllocString(L"test");

		//对这个进行求值的字符串，必须由::SysAllocByte分配
		int len = ::SysStringByteLen(s);
		int len2 = ::SysStringByteLen(L"ffffff");
		assert(len==8);
		assert(len2 == 0);

		BSTR m_str = ::SysAllocStringByteLen((char*)s, len);
		ptr->put_name(s);
		BSTR sr = NULL;
		ptr->get_name(&sr);

		int r = wcscmp(s, sr);
		assert(r == 0);

		::SysFreeString(s);
		printf("access resource success!");
	}

	CoUninitialize();
}

int main(int argc, char *argv[])
{
	test();
	getchar();
	return 0;
}