couninitialize函数

CoUninitialize函数是Windows提供的API函数，用于关闭当前线程的COM Library。在应用程序关闭时调用，因为应用程序隐藏其main窗口并通过其main消息循环之后对COM库进行的最后一次调用。

什么是coinitialize函数

coinitialize函数是COM(Component Object Model,组件对象模型)中的一个函数，用于初始化一个COM对象，在多线程环境下，每个线程都需要使用自己的COM对象，而coinitialize函数可以确保每个线程都有一个独立的COM对象实例，这样可以避免线程间的数据共享和同步问题，提高程序的稳定性和性能。

如何使用coinitialize函数

1、包含头文件

要使用coinitialize函数，首先需要包含相应的头文件：

include <objbase.h>

2、调用coinitialize函数

在使用coinitialize函数之前，需要先调用CoInitialize函数进行初始化，CoInitialize函数的原型如下：

HRESULT CoInitialize(LPVOID *ppv);

ppv是一个指向指针的指针，用于接收初始化的COM库的接口句柄，如果初始化成功，返回S_OK;否则，返回错误代码。

示例代码：

include <iostream>include <objbase.h>include <comdef.h>int main() {    HRESULT hr = CoInitialize(NULL);    if (SUCCEEDED(hr)) {        std::cout << "初始化成功" << std::endl;    } else {        std::cout << "初始化失败，错误代码：" << hr << std::endl;    }    return 0;}

3、使用COM对象

在完成初始化后，就可以使用COM对象了，创建一个CView对象并显示在一个窗口中：

include <windows.h>include <commctrl.h>include <atlbase.h>include <atlcomcli.h>include <atlstr.h>include <atlwin.h>include <atlview.h>include <atlframe.h>include <atldlgs.h>include <atlapp.h>include <tchar.h>include <objbase.h>include <comdef.h>include <string>include <vector>include <iostream>include <objbase.h> // Needed for CComObjectRootEx<>::FindClass() and CComPtr<>. Also needed for CComQIPtr<> and CComBSTR(). See the remarks section of this header file for more information on why these headers are necessary. The import directive is not needed because all of the types used in this header file are defined in WinNT.h as well as ATL/WTypes.h or ATL/AtlBase.h. If you do not have these headers included before including this header file, it will cause a compile time error. To fix this problem, include WinNT.h first, then include ATL/WTypes.h or ATL/AtlBase.h last. This header file also requires Windows SDK version >= v6.0A to work properly. If you do not have Windows SDK version >= v6.0A installed on your machine, you will need to install it before you can use this header file. You can download the latest version of Windows SDK from Microsoft's website at http://www.microsoft.com/downloads/en/details.aspx?FamilyID=e5b478d9-f7a5-4c9e-8c3e-a2b3e5b8c3e5&displaylang=en. For more information about how to install the Windows SDK, see http://msdn.microsoft.com/en-us/library/ms235627%28VS.85%29.aspx. If you encounter any problems when using this header file, please refer to the following articles for help: http://msdn.microsoft.com/en-us/library/ms235619%28VS.85%29.aspx http://msdn.microsoft.com/en-us/library/ms678541%28VS.85%29.aspx http://msdn.microsoft.com/en-us/library/ms686761%28VS.85%29.aspx http://msdn.microsoft.com/en-us/library/ms686761%28VS.85%29.aspx http://msdn.microsoft.com/en-us/library/ms686761%28VS.85%29.aspx http://msdn.microsoft.com/en-us/library/ms686761%28VS.85%29.aspx http://msdn.microsoft.com/en-us/library/ms686761%28VS.85%29.aspx http://msdn