“The C language provides no built-in facilities for performing such common operations as input/output, memory management, string manipulation, and the like. Instead, these facilities are defined in a standard library, which you compile and link with your programs. The GNU C library, described in this document, defines all of the library functions that are specified […]
Posts on Programming
Tutorials and tips on programming related to Linux systems, Web and more.
64 posts in total.
Vim + cgdb
I begin to use vim for programming. I like the tools that focus on one function. I used to use emacs. But I think I like vim more. For debugging, I use gdb. But I use the front end cgdb. I can see the codes with the cursor when debugging. I can use F8 for […]
MFC中屏蔽ESC和回车关闭对话框
解决方法是在CDialog::PreTranslateMessage() 的重载函数中将ESC和回车按键的消息处理掉. 直接上代码: BOOL CResultCollectorDlg::PreTranslateMessage(MSG* pMsg) { if(pMsg->message == WM_KEYDOWN) { switch(pMsg->wParam) { case VK_RETURN: //回车 return TRUE; case VK_ESCAPE: //ESC return TRUE; } } return CDialog::PreTranslateMessage(pMsg); }
Generating Mixed Source and Assembly List using GCC
When debugging and optimizing programs, developers sometimes need to generate and investigate into the assembly generated by the compiler. Generating a mixed source and assembly list will help a lot for debugging and optimization. gcc can achieve this by working with the assembler. Generate assembly list mixed with the source code Just add these gcc […]
Win32下COM口通信控制
这段时间做兼职帮做了一个COM口单片机监控控制程序, 学习了些Win32下COM口的控制. 下面是与COM口控制有关的部分示例代码. //打开COM1 hCOM=CreateFile( “COM1″,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL); if (hCOM==INVALID_HANDLE_VALUE) { MessageBox( GetForegroundWindow(),”无法打开串口！”,”操作失败”,MB_ICONINFORMATION); return; } //设置DCB DCB dcb; if (!GetCommState(hCOM,&dcb)) { MessageBox( GetForegroundWindow(),”无法获取串口状态！”,”操作失败”,MB_ICONINFORMATION); hCOM=INVALID_HANDLE_VALUE; return; } dcb.BaudRate=9600; dcb.ByteSize=8; dcb.Parity=NOPARITY; dcb.StopBits=ONESTOPBIT; if (!SetCommState(hCOM,&dcb)) { MessageBox( GetForegroundWindow(),”无法设置串口状态！”,”操作失败”,MB_ICONINFORMATION); hCOM=INVALID_HANDLE_VALUE; return; } //设置COMMTIMEOUTS COMMTIMEOUTS communication_timeout; communication_timeout.ReadIntervalTimeout=MAXDWORD; communication_timeout.ReadTotalTimeoutMultiplier=0; communication_timeout.ReadTotalTimeoutConstant=0; communication_timeout.WriteTotalTimeoutMultiplier=0; communication_timeout.WriteTotalTimeoutConstant=0; if (!SetCommTimeouts(hCOM,&communication_timeout)) { MessageBox( GetForegroundWindow(),”无法设置串口超时！”,”操作失败”,MB_ICONINFORMATION); hCOM=INVALID_HANDLE_VALUE; return; } //向串口写入ABC三个字符 ULONG nBytesWritten; […]
Win32 Programming: Operation on Files
Here, we show some example code on Win32. The code are operations on file on Win32 OSes. The code here uses some MFC classes. Recursively show the files from a path: void Show(const char *folderPath) { CFileFind finder; CString path(folderPath); path += “*.*”; BOOL bWorking = finder.FindFile(path); while (bWorking) { bWorking = finder.FindNextFile(); cout << […]
使用选择文件夹对话框
这是如何在VC下使用选择文件夹对话框,返回文件夹的地址的代码: CString BrowseDirectory( LPCTSTR title ) { char dir[MAX_PATH]; dir[0]=’0′; BROWSEINFO bi; bi.hwndOwner=NULL; bi.pidlRoot=NULL; bi.pszDisplayName=dir; bi.lpszTitle=title; bi.ulFlags=0; bi.lpfn=NULL; bi.lParam=NULL; bi.iImage=NULL; SHGetPathFromIDList(SHBrowseForFolder(&bi),dir); return dir; }
禁止对话框关闭按钮和Alt+F4
在某些情况下我们需要防止用户单击窗口的标题栏中的关闭按钮关闭 MFC 应用程序。可以删除窗口的WS_SYSMENU 样式， 但是，这样最大化最小化和还原按钮也被删除，并且无法添加。 这是Windows的设计依据。 可以通过禁用关闭按钮来模拟没有关闭按钮的窗口。 在 WM_CREATE 消息处理程序中禁用关闭按钮。使用下面的代码： CMenu *pSysMenu = GetSystemMenu(FALSE); ASSERT(pSysMenu != NULL); VERIFY(pSysMenu->RemoveMenu(SC_CLOSE, MF_BYCOMMAND)); 这样删除之后关闭按钮变为灰色，用户无法点击。但是使用Alt+F4仍然可以关闭程序。要将此功能也禁用需要重载CDialog的OnSysCommand方法。代码如下： void MyDlg::OnSysCommand( UINT nID, LPARAM lParam ) { if ( ( nID & 0xFFF0 ) == IDM_ABOUTBOX ) { CAboutDlg dlgAbout; //if you have an about dialog dlgAbout.DoModal(); } //add the following code else if […]
使用MFC在一对话框中嵌入另一对话框
全文介绍如何使用MFC在一对话框中嵌入另一对话框. 代码如下： static MyInDlg inDlg; // 需嵌入的对话框 inDlg.Create( IDD_DIALOG, AfxGetApp()->m_pMainWnd); CRect rc; // 嵌入对话框在原对话框中的位置 //GetClientRect(&rc); rc.left = 150; rc.top = 0; rc.bottom = 200; rc.right = 350; inDlg.MoveWindow( rc ); // 设置位置 inDlg.ShowWindow( SW_SHOW ); // 将对话框显示出来 对嵌入对话框设置如下： Style: Child Border: none
OCaml Learning Materials
OCaml is an interesting functional language. There are lots learning materials on the Internet. I compile a list of resources for OCaml learning and reference. Recommended OCaml learning and reference material Online book of Real World OCaml by Yaron Minsky, Anil Madhavapeddy, Jason Hickey. A very good tutorial by Jason Hickey: http://www.cs.caltech.edu/courses/cs134/cs134b/book.pdf. The OCaml system […]
一个非常优秀的MFC Grid控件
使用MFC进行开发, 界面编程占用了很大部分的时间. 像Grid这样的控件, MFC并没有提供支持. 发现了这样一个GridCtrl控件, 非常好用: http://www.codeproject.com/KB/miscctrl/gridctrl.aspx 要开发类似的程序时可以采用.
How to Use MFC SetTimer
这是一个在MFC中使用Timer的示例: 1) 设定Timer In OnInitDialog(): UINT time_result = SetTimer(1, 50, 0); Timer的ID是1. 间隔是50ms. 2) 处理Timer事件 在OnTimer(UINT nIDEvent)函数中处理事件. 3) 程序退出时销毁设定的Timer. In OnDestroy(): KillTimer(1);
Send Messages to Other Windows Using Win32 API
It is simple for basic use. Just the example code. It is clear enough. int SendMsgToOtherWindow( ) { // find window by name HWND wnd = FindWindow( 0, “计算器” ); if ( wnd == 0 ) return 0; // print the child window text HWND cwd = GetWindow( wnd, GW_CHILD ); while ( cwd ) […]
Micosoft招聘部分算法题
Micosoft招聘部分算法题 1.链表和数组的区别在哪里？ 2.编写实现链表排序的一种算法。说明为什么你会选择用这样的方法？ 3.编写实现数组排序的一种算法。说明为什么你会选择用这样的方法？ 4.请编写能直接实现strstr()函数功能的代码。 5.编写反转字符串的程序，要求优化速度、优化空间。 6.在链表里如何发现循环链接？ 7.给出洗牌的一个算法，并将洗好的牌存储在一个整形数组里。 8.写一个函数，检查字符是否是整数，如果是，返回其整数值。（或者：怎样只用4行代码编写出一个从字符串到长整形的函数？） 9.给出一个函数来输出一个字符串的所有排列。 10.请编写实现malloc()内存分配函数功能一样的代码。 11.给出一个函数来复制两个字符串A和B。字符串A的后几个字节和字符串B的前几个字节重叠。 12.怎样编写一个程序，把一个有序整数数组放到二叉树中？ 13.怎样从顶部开始逐层打印二叉树结点数据？请编程。 14.怎样把一个链表掉个顺序（也就是反序，注意链表的边界条件并考虑空链表）？ 来源:·日月光华 bbs.fudan.edu.cn
Inputing and Outputing Hexdecimal Integers with iostream
It is straightforward. I just put the example code: #include <fstream> #include <iomanip> using std::cout; using std::ifstream; using std::ios; using std::hex; int main(){ ifstream is(“e:testtest.txt”); int i = 0; is >> hex >> i; cout << hex << i << endl; is.close(); return 0; }
How to convert string to int and int to string in C and C++
It is common to convert string to int and int to string in C and C++ programs. This post introduces how to convert a valid string to int and int to string in C and C++. If your string is not a valid integer string, you should check it first or use other methods. Convert […]
MFC程序使用系统风格界面
VC6默认编译出来的程序在XP下Luma风格下运行也是Windows的经典界面, 有损界面的美观与统一. VC2008默认设置下如果不是使用的unicode也是如此. 本文给出使VC6和VC2008可以编译出使用系统界面风格的解决方案. 1. 使VC6编译出使用系统风格的程序 步骤如下: 1) 创建一个.manifest文件的资源. 在res/文件夹下创建一个跟以程序名加.manifest的文件, 如果程序为test.exe, 则创建test.exe.manifest 文件可由此下载: https://www.systutorials.com/t/g/programming/resultcollector.manifest/ 注意要使用utf-8编码保存。 2) 将新定义的资源加入到.rc2文件中, 类型设为24. 打开res/文件夹下的.rc2文件, 在其中加入如下定义: 1 24 MOVEABLE PURE “res/test.exe.manifest” 其中的文件地址按1)步中修改的设置即可. 之后编译即可, 为了使程序界面可能充分利用系统的界面特性, 可以将界面字体设置为TrueType类型的, 利用Windows XP等系统的屏幕字体平滑特性. 2. 使VC2008编译出使用系统风格的程序 在VC2008下就比较简单了, 如果程序字符集使用unicode则默认就是使用系统界面风格的, 如果选择其它的类型, 则编辑下stdafx.h即可. 最后面部分找到这么一段: #ifdef _UNICODE #if defined _M_IX86 #pragma comment(linker,”/manifestdependency:”type=’win32′ name=’Microsoft.Windows.Common-Controls’ version=’6.0.0.0′ processorArchitecture=’x86′ publicKeyToken=’6595b64144ccf1df’ language=’*'””) #elif defined _M_IA64 #pragma comment(linker,”/manifestdependency:”type=’win32′ […]
Java Calling Native Functions in .DLL on Windows
How to call a function in .dll from Java on Windows is introduced in this post with an example. Platforms used: OS: Microsoft Windows XP [5.1.2600] C to .dll compiler: MS Visual Studio 2008 JDK: java -version java version “1.6.0_05” Java(TM) SE Runtime Environment (build 1.6.0_05-b13) Java HotSpot(TM) Client VM (build 10.0-b19, mixed mode, sharing) […]
JSP Connecting to MySQL
We use tomcat as the container used for instructions in the post. 1) Download the driver mysql-connector-java-*.*.*-bin.jar and put it into WEB-INF/lib/, and remember to restart tomcat. 2) The example code as follows. String driverName="com.mysql.jdbc.Driver"; String userName="username"; String userPasswd="password"; String dbName="dbname"; String tableName="tablename"; String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd; Class.forName("com.mysql.jdbc.Driver").newInstance(); Connection conn=DriverManager.getConnection(url); Statement statement = conn.createStatement(); String sql="SELECT * […]
An Online JPG to EPS Converter
Converting the JPG images to EPS is frequently need especially when write documents in LaTeX. I introduced how to Convert JPG Images to EPS on Linux. However, not everyone have a Linux box available at any time. We set up an Online JPG to EPS Converter to help people convert JPG to EPS. Convert JPG […]
