msdn variant

Variant is one of the important parameter variables for communication between COM components. It can accommodate a variety of different types, such as short, long, and double, including various pointers and arrays. Mutual calling between components

The variant type is often used to pass parameters to com objects or receive values returned from COM objects. You can also write methods that return the variant type by yourself. The input parameters (for example, in an automated operation,

  Inline cstring vtocstr (variant * V){If (V-> VT = vt_bstr){Cstring STR (lpcwstr) V-> bstrval );Return STR;}Else{Return cstring ("");}} # Define vtolong (V). Vt = vt_i4? (Long) (v). lval: 0l)# Define vtodate (V). Vt = vt_date? (Ctime) (v). ival: 0l)

In marshalasattribute, the first parameter type is the unmanagedtype enumeration to specify the corresponding unmanaged data type. In this enumeration type, there are two very strange values: unmanaged. lpstruct and unmanagedtype. struct. The two

Wtl guide for MFC programmers: Part VI-compatible ActiveX Controls Original:Michael Dunn[Original ENGLISH]Translation: Orbit [www.winmsg.com] Download DEMO code Content of this Chapter Introduction Start with the Wizard Create a project

Proficient in combined VC and Matlab programming -- Comprehensive Example 2 Author: Deng Ke The tool used in this article: vc6.0 + php6.5 In this chapter, the MATLAB Neural Network Toolbox is called in VC. The program used in this article is part

Link: http://blog.csdn.net/gavin_sw/archive/2007/04/11/1561254.aspx For details, refer:Http://www.matrix.org.cn/thread.shtml;jsessionid=B1E4B57897D51B59802D353CB6B32ACC? Topicid = 29594 & forumid = 17 Preparations: 1. Install "Adobe Acrobat 7.0

The navigate2 method of the iwebbrowser2 interface is used to implement the Community game in the Development of http post transmission floating white clouds 2007/11/8. It is required to extend the original Mini browser to enable the webpage through

Using the Navigate2 method of IWebBrowser2 interface to implement Http POST transmission Floating clouds 2007/11/8 In the development of the community game, the original Mini browser is required to expand to be able to open the Web page via HTTP

C # Win32 API ProgrammingC # users often ask two questions: "Why should I write additional code to use features built in windows? Why can't I complete this task for me without relevant content in the framework ?" When the Framework Team built their.