api programming for beginners

Microsoft has made a lot of interfaces for programming with DirectX brothers. We can see below ildasm that there is only one class named filgraphmanagerclass. In fact, I have read it carefully, there are not many large functions. DirectX is divided into four layers in abstraction, Hardware/network layer: multimedia devices, including Graphics accelerators, sound cards, input devices, and network communication devices; DirectX base layer: provides basi

SendBuf; while (Getline (CIN,SENDBUF)) { if (!clientsocket.send (clientsocket,sendbuf)) { Err_exit (" Send Error "); } Sendbuf.clear (); if (!clientsocket.receive (clientsocket,sendbuf)) { err_exit ("Receive error"); } cout Attached -commen.h#ifndef comment_h_included#define comment_h_included#include "Socket.h" #include Attached -makefileCC = g++ Cppflags =-wall-g-pthreadbin = Server Clientsources = $ (bin.=.cp

I. What is SVG? SVG is a 2D graphic description language released by W3C in 1999. It is a markup language based solely on XML format.The full name is extensible vector graphics, which is very different from traditional Raster graphics (JPG, PNG, GIF, etc.).No. SVG is a 2D graphics development platform. It consists of two parts: XML-based data description andThe other part is a programmable API. Its key features support graphics, text, gradient fill, p

Linux inter-process communication (IPC) programming practices (8) use of shared memory-POSIX shared memory (API) 1. Posix provides two methods to share memory areas between unrelated processes: (1) memory ing file: open the function first, and then call the mmap function to map the obtained descriptor to a file in the current process address space (this is used in the previous blog ). (2) shared memory area

, otherwise it is possible to write other characters other than the content that lpdata points to the registry.4. Code20180218_ Registry Programming Basics. CPP: The entry point that defines the console application. #include "stdafx.h" #include 5. Effect6. Reference:How do I use RegCreateKeyEx?Https://stackoverflow.com/questions/29115493/how-to-use-regcreatekeyex32-bit and 64-bit application Data in the Registryhttps://msdn.microsoft.com/en-us/library

members use the most FD, which specifies the target file descriptor that the event is subordinate to, and the PTR member can use to specify FD-related user data, but since opoll_data_t is a consortium, we cannot work with both FD and PTR. If you want to associate the file descriptor Hum User data for fast data access, you can use only other means, such as discarding the FD member, and the user data pointed to by the PTR pointer contains the FD#include The timeout parameter has the same meaning

The user uses the function CreateFile () to create a connection to the specified serial port.File, you can then use the file handle returned by the function to stringPort parameter settings.01 HANDLE Hmodem; Defining a serial port handleHmodem=createfile ("COM1", generic_read| generic_write,0,0,03 open_existing,file_flag_overlapped,0); Associative stringsPort and returns its handleThen use Getcommstate () to get the current COM1 DCBAppropriate modification of DCD, the function can be calledSetCo

toPostQuitMessage ()the value, here you can ignore it, fromWinMain ()The return value will be used in the exit code for the end of the process. Focus : Getmessgae () will return 1 If there is an error, be sure to remember this, or at some point you will have a sore egg ... Even if GetMessage () is defined to return a Boolean value, it can also return a value other than TRUE or FALSE , because BOOL is defined using a UINT(unsigned int). The following code example may work, but the condition wil

file pointer of the specified file.DWORD WINAPI SetFilePointer( _In_ HANDLE hFile, _In_ LONG lDistanceToMove, _Inout_opt_ PLONG lpDistanceToMoveHigh, _In_ DWORD dwMoveMethod);Field Description: inch HANDLE hfile, file handle inch A LONG ldistancetomove that specifies the number of bytes to move the file pointer. inout_opt Plong lpDistanceToMoveHigh, Pointer to a high 32-bit position that points to the 64-bit moving distance of the symbol. If the hig

server-side technology,allows developers to concentrate on the game logic development, quickly create a VA Riety of games.(Frequently asked Load-limit, Kbengine is designed to being multi-process distributed dynamic load Balancing scheme, in Theor Y need to expand hardware can increase load-limit, the single machine load-limit depends on complexity of logic of th e game itself.)What is Kbengine?An open-source game server engine that uses a simple convention protocol to enable clients to interac

Some time ago spent 38 yuan from the Internet to buy a pair of North pass USB game handle, so the weekend and evening leisure time can play when the boy's SFC and arcade simulation game. One day on a website to play a flash game, suddenly thought, if you can also use the handle to play flash games, it should be more fun. But unfortunately, the current flash is not supported on the game to program the handle, which is unavoidable in flash a regret. Although the flash does not support the game h

Document directory Use setTimeout to delay function execution Use clearTimeout to cancel an execution plan Develop and cancel repeated execution plans for Functions Use process. nextTick to delay function execution to the next round of the event Loop Congestion event Loop Exit event Loop Use setTimeout instead of setInterval to ensure the serialization of function execution For the list of articles in this series and the translation progress, see Node. js advanced

extension."C:\\xyz\\bak\\x.ini" composite standard"Ccc\\ttt\\kk\\ini" is not/* Inference infers whether a full pathname is in the C drive and is an. ini extension."C:\\xyz\\bak\\x.ini" composite Standard "Ccc\\ttt\\kk\\ini" is not */package stringapi; public class Judgepath {public static void Main (string[] args) { //String s = "Ccc\\ttt\\kk\\ini"; String s = "C:\\xyz\\bak\\x.ini"; Boolean judge = false; if (S.startswith ("c:\\") s.endswith (". ini")) {//start wit

Msg_more Msg_more Msg_waitforone = 0x10000,/* Wait for at least one packet to return.*/#define MSG_WAITF Orone Msg_waitforone msg_cmsg_cloexec = 0x40000000/* Set close_on_exit for file Descripto R received through Scm_rights. */#define MSG_CMSG_CLOEXEC msg_cmsg_cloexec};8). Close/shutdown ()Two ways to close the socketI. Close () Completely close the socket channel, including read and write #include II. Shutdown () Enhanced flexibility to selectively turn off read or wri

#include "windows.h" #include "tchar.h" int apientry _twinmain (hinstance hinstance,hinstance hprevinstance,lptstr Lpcmdline,int ncmdshow) {MessageBox (NULL, Text ("hello,world!"), text ("haha"), MB_OK); return 0;}When using _tWinMain as the entry function, the third parameter type should be defined as LPTSTR, which represents the WCHAR * type#include "windows.h" #include "tchar.h" int apientry WinMain (hinstance hinstance,hinstance hprevinstance,lpstr Lpcmdline,int ncmdshow) {MessageBox (NULL,

(SOCKFD, (const struct sockaddr *) serveraddr, sizeof (serveraddr)) = =-1) err_exit ("Connect error"); Char buf[512]; while (Fgets (buf, sizeof (BUF), stdin)! = NULL) {if (write (SOCKFD, buf, strlen (buf)) = = =-1) err_exit ( "Write socket error"); memset (buf, 0, sizeof (BUF)); int readbytes = Read (SOCKFD, buf, sizeof (BUF)); if (readbytes = = 0) {cerr Attached-makefile. Phony:clean all CC = g++ Cppflags =-wall-g-pthread-std=c++11bin = Server Clientsources =

Library specifies the library file to be linked when the program is linked. You can set the project or use # pragma comment (Lib, "XXX. lib ") pre-compiled commands to implement links to the library files. Microsoft has also improved GDI and provided a class-based Application Programming Interface (GDI. This interface is intended for C/C ++ users. 1. Precautions for calling windowsapi As mentioned above, windowsapi is implemented through the dynamic

API programming: Controls in dialogbox message processing, such as editbox wm_char message, wm_paste message, ComboBox cbn_selchange message, and editbox en_change message. The sample code is as follows: // 1. Create a dialogShort showactivationdlg (hwnd hparent){Lresult LRET = 0;LRET = dialogbox (g_hinstthisdll, makeintresource (idd_dialog_activate), hparent, (dlgproc) dlgactivationproc ); Return (short) L

Controls created with the CreateWindow function, if you want to switch with the TAP key, the simplest way is: the main window has ws_ex_controlparent extension properties, the control has ws_tapstop properties.Then the most important thing is to make a judgment when dealing with the message loop : 1 while(GetMessage (msg, NULL,0,0))2 {3 if(! IsDialogMessage (hwnd, AMP;MSG))//Not the HWND, not the message.4 {5TranslateMessage (msg);6DispatchMessage (msg);7 }8 9}WI

(LISTENFD, (const struct sockaddr *) addr, sizeof (addr)) = =-1) err_exit ("Bind error"); if (Listen (LISTENFD, somaxconn) = =-1) err_exit ("Listen error"); Char buf[512]; int readbytes; struct sockaddr_in clientaddr; Remember: Be sure to initialize socklen_t Addrlen = sizeof (CLIENTADDR) here; while (true) {int clientfd = accept (LISTENFD, (struct sockaddr *) clientaddr, addrlen); if (clientfd = =-1) err_exit ("Accept error"); Print client IP address and port numb