extern

WindowsAPI调用和OCR图片识别

强颜欢笑 提交于 2019-12-21 04:07:18
WindowsAPI在每一台Windows系统上开放标准API供开发人员调用. 功能齐全.在这里只介绍三个部分. 1.利用API控制鼠标键盘. 2.对外部程序的读写和监听 3.对外部程序窗口的改动. 外部程序的意思就是.假设我的程序是360.辣么我能控制腾讯QQ客户端啥的. const int MOUSEEVENTF_MOVE = 0x0001; // 移动鼠标 const int MOUSEEVENTF_LEFTDOWN = 0x0002; //模仿鼠标左键按下 const int MOUSEEVENTF_LEFTUP = 0x0004; //模仿鼠标左键抬起 const int MOUSEEVENTF_RIGHTDOWN = 0x0008; //模仿鼠标右键按下 const int MOUSEEVENTF_RIGHTUP = 0x0010; //模仿鼠标右键抬起 const int MOUSEEVENTF_MIDDLEDOWN = 0x0020;// 模仿鼠标中键按下 const int MOUSEEVENTF_MIDDLEUP = 0x0040;// 模仿鼠标中键抬起 const int MOUSEEVENTF_ABSOLUTE = 0x8000; //标示是否采取绝对坐标 private const int WM_SETTEXT = 0x000C; const int BM

C#通信串口类

…衆ロ難τιáo~ 提交于 2019-12-20 00:22:50
以前做过一段时间短信研究,找到一牛人写串口类,调试链接COM接口是成功的。 代码 1 using System; 2 using System.Runtime.InteropServices; 3 4 namespace OPE 5 { 6 public class JustinIO 7 { 8 public class CommPort 9 { 10 11 public string PortNum; 12 public int BaudRate; 13 public byte ByteSize; 14 public byte Parity; // 0-4=no,odd,even,mark,space 15 public byte StopBits; // 0,1,2 = 1, 1.5, 2 16 public int ReadTimeout; 17 public string CenterNumber; 18 19 // comm port win32 file handle 20 private int hComm = - 1 ; 21 22 public bool Opened = false ; 23 24 // win32 api constants 25 private const uint GENERIC_READ = 0x80000000 ; 26 private

使用dlopen和dlsym来使用C++中的类

我的梦境 提交于 2019-12-19 23:40:30
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 使用dlopen和dlsym来使用C++中的类 2008-08-09 23:43:37 分类: 一般来说,dlopen和dlsym是来处理C库中的函数的,对于C++中存在的name mangle问题,类的问题就不易处理,看下文你会有所收获。 转载自: http://www.linuxsir.org/bbs/printthread.php?t=266890 C++ dlopen mini HOWTO 中译版 [原创] C++ dlopen mini HOWTO 作者:Aaron Isotton <aaron@isotton.com> 2006-03-16 译者:Lolita@linuxsir.org 2006-08-05 ------------------------------------------------ 摘要   如何使用dlopen API动态地加载C++函数和类 ------------------------------------------------ 目录   介绍     版权和许可证     不承诺     贡献者     反馈     术语   问题所在     Name Mangling     类   解决方案     extern "C"     加载函数     加载类  

visual c#设计的多功能关机程序

人盡茶涼 提交于 2019-12-19 18:49:58
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Visual C# 设计多功能关机程序 许多软件都有自动关机功能, 特别是在长时间 下载 的时候, 这个功能可是使你不用以守候在计算机前面, 而电脑却能按照 您事先的设定自动关闭。现在我们用 visual C# 来编写一个多功能的关机程序。该程序具有:定时关机、倒计时关机、关机 提醒、系统信息获取等四项功能 , 可设定关机时间精确到秒。并且让你很快掌握 Visual C# 中对 API 的操作程序。 一 . 设计关闭 Windows 窗体 界面的设计 新建一个标准工程,向工程中增加一个 Windows 窗体并向窗体中添加如下控件,并分别设置其属性: 控件名 类别 Text 控件名 类别 Text CheckBox1 CheckBox 自动关机 GrouPBox1 GroupBox 当前系统时间 CheckBox1 CheckBox 倒计时执行操作 GroupBox2 GroupBox 设定时间 CheckBox1 CheckBox 定时报警 TxtTime TextBox ButCancle Button 取消 SetupTime DateTimePicker ButReOpen Button 重新启动 SetupDate DateTimePicker ButClose Button 关机 Timer1

extern on function prototypes?

限于喜欢 提交于 2019-12-19 15:06:48
问题 my_math.h // case 1 unsigned int add_two_numbers(unsigned char a, unsigned char b); //case 2 extern unsigned int add_two_numbers(unsigned char a, unsigned char b); What is the difference between case 1 and case 2? I never used extern for function prototypes but looking at someone's code (who is way more experienced than I am) I see extern always used when declaring the function prototype. Can anyone point please point the difference? (or point me to a link where I can find specific

extern on function prototypes?

吃可爱长大的小学妹 提交于 2019-12-19 15:06:14
问题 my_math.h // case 1 unsigned int add_two_numbers(unsigned char a, unsigned char b); //case 2 extern unsigned int add_two_numbers(unsigned char a, unsigned char b); What is the difference between case 1 and case 2? I never used extern for function prototypes but looking at someone's code (who is way more experienced than I am) I see extern always used when declaring the function prototype. Can anyone point please point the difference? (or point me to a link where I can find specific

Linker error using extern “C” in Objective-C code

天涯浪子 提交于 2019-12-19 03:41:49
问题 I'm trying to create some utility functions that can be called from both Objective-C and C++ code in an iPhone application. I have third party C++ classes that cannot be compiled as ObjectiveC++ (.mm). I have a header file declaring my functions, then a .c file defining them. I've tripled checked for spelling errors, but for some reason my linker is NOT able to find the definition of any of the functions. Here is the header for the C helper functions: #ifndef FILE_LOADER_H #define FILE_LOADER

Linker error using extern “C” in Objective-C code

萝らか妹 提交于 2019-12-19 03:41:08
问题 I'm trying to create some utility functions that can be called from both Objective-C and C++ code in an iPhone application. I have third party C++ classes that cannot be compiled as ObjectiveC++ (.mm). I have a header file declaring my functions, then a .c file defining them. I've tripled checked for spelling errors, but for some reason my linker is NOT able to find the definition of any of the functions. Here is the header for the C helper functions: #ifndef FILE_LOADER_H #define FILE_LOADER

Extern and Static Pointers in C

一曲冷凌霜 提交于 2019-12-19 02:46:16
问题 Hi what could be the usage of static and extern pointer ?? if they exist 回答1: To answer your question about when they could be used, a couple of simple examples: A static pointer could be used to implement a function that always returns the same buffer to the program, allocating it the first time it is called: char * GetBuffer() { static char * buff = 0; if ( buff == 0 ) { buff = malloc( BUFSIZE ); } return buff; } An extern (i.e. global) pointer could be used to allow other compilation units

“extern” inside a function?

[亡魂溺海] 提交于 2019-12-18 14:24:49
问题 Well, reading "a bit old" book ("The C programming language", second edition, by Dennis Ritchie), I came a cross the following: An external variable must be defined, exactly once, outside of any function; this sets aside storage for it. The variable must also be declared in each function that wants to access it and I was like - what?! "The variable must also be declared in each function that wants to access it". Then, I was shocked one more time: int max; /* ... */ int main() { extern int max