wxWidgets helper classes
- wxWidgets库可以创建控制台（ console ）和界面（ gui ）程序，下面将在控制台模式下介绍一些helper class。
Console
这是一个简单得控制台程序，在控制台窗口里输出一些信息。
#include <wx/string.h>
int main(int argc, char **argv)
{
wxPuts(wxT("A wxWidgets console application"));
}
Output：Linux Operating System
2. Printf() 方法用来格式化字符串
#include <wx/string.h>
int main(int argc, char **argv)
{
int flowers = 21;
wxString str;
str.Printf(wxT("There are %d red roses."), flowers);
wxPuts(str);
}
Output：There are 21 red roses.
3. 下面这个例子用来检查一个字符串是否包含另外一个字符串。这次我们使用Contains()方法
#include <wx/string.h>
int main(int argc, char **argv)
{
wxString str = wxT("The history of my life");
if (str.Contains(wxT("history"))) {
wxPuts(wxT("Contains!"));
}
if (!str.Contains(wxT("plain"))) {
wxPuts(wxT("Does not contain!"));
}
}
Output：
Contains!
Does not contain!
4. Len()用来返回一个字符串的长度
#include <wx/string.h>
int main(int argc, char **argv)
{
wxString str = wxT("The history of my life");
wxPrintf(wxT("The string has %d characters\n"), str.Len());
}
Output：The string has 22 characters.
5. MakeLower()和MakeUpper()用来进行大小写转换
#include <wx/string.h>
int main(int argc, char **argv)
{
wxString str = wxT("The history of my life");
wxPuts(str.MakeLower());
wxPuts(str.MakeUpper());
}
Output：
the history of my life
THE HISTORY OF MY LIFE
Time & date
1. 下面的例子用不用的格式显示当前的时间
#include <wx/datetime.h>
int main(int argc, char **argv)
{
wxDateTime now = wxDateTime::Now();
wxString date1 = now.Format();
wxString date2 = now.Format(wxT("%X"));
wxString date3 = now.Format(wxT("%x"));
wxPuts(date1);
wxPuts(date2);
wxPuts(date3);
}
Output
Fri Sep 7 21:28:38 2007
21:28:38
09/07/07
2. 下面显示不同国家（时区）的当前时间
#include <wx/datetime.h>
int main(int argc, char **argv)
{
wxDateTime now = wxDateTime::Now();
wxPrintf(wxT(" Tokyo: %s\n"), now.Format(wxT("%a %T"),
wxDateTime::GMT9).c_str());
wxPrintf(wxT(" Moscow: %s\n"), now.Format(wxT("%a %T"),
wxDateTime::MSD).c_str());
wxPrintf(wxT("Budapest: %s\n"), now.Format(wxT("%a %T"),
wxDateTime::CEST).c_str());
wxPrintf(wxT(" London: %s\n"), now.Format(wxT("%a %T"),
wxDateTime::WEST).c_str());
wxPrintf(wxT("New York: %s\n"), now.Format(wxT("%a %T"),
wxDateTime::EDT).c_str());
}
Output
Tokyo: Sat 05:42:24
Moscow: Sat 00:42:24
Budapest: Fri 22:42:24
London: Fri 22:42:24
New York: Fri 16:42:24
Files
1. 下面的例子里，用wxFile创建一个文件并向其写入数据。另外测试此文件是否被打开。
int main(int argc, char **argv)
{
wxString str = wxT("You make me want to be a better man.\n");
wxFile file;
file.Create(wxT("test"), true);
if (file.IsOpened())
wxPuts(wxT("the file is opened"));
file.Write(str);
file.Close();
if (!file.IsOpened())
wxPuts(wxT("the file is not opened"));
}
OutPut：
the file is opened
the file is not opened
test文件内：You make me want to be a better man.
2. 下面的例子将用wxTextFile输出文件的行数，第一行与最后一行的内容。最后，将显示文件的内容。
#include <wx/textfile.h>
int main(int argc, char **argv)
{
wxTextFile file(wxT("test.c"));
file.Open();
wxPrintf(wxT("Number of lines: %d\n"), file.GetLineCount());
wxPrintf(wxT("First line: %s\n"), file.GetFirstLine().c_str());
wxPrintf(wxT("Last line: %s\n"), file.GetLastLine().c_str());
wxPuts(wxT("-------------------------------------"));
wxString s;
for ( s = file.GetFirstLine(); !file.Eof();
s = file.GetNextLine() )
{
wxPuts(s);
}
file.Close();
}
Output
Number of lines: 8
First line: #include
Last line: }
-------------------------------------
#include <glib.h>
#include <glib/gstdio.h>
int main() {
g_mkdir("/home/vronskij/test", S_IRWXU);
}