wxWidget入门（六）

这一期是为了解决（三）中关于文件操作的历史遗留问题。

其实这一期不出也没什么关系，我相信如果大家有详细跟着我的学习笔记一步步敲下来。会看官方文档，应该问题不大。

解题思路：

尝试：

既然是文件操作，联系老外的命名规则，再怎么着总有一个类是有带"file"的类吧，无非是加了一个"商标" —— "wx" 而已

通过搜索得到一个链接https://docs.wxwidgets.org/trunk/classwx_file.html

包的头文件就是

#include <wx/wx.h>
#include <wx/file.h>

先讲一个前提

①New——新建一个文件

我这里就简单示范下，默认是新建"aaa.txt"，如果存在就不新建了。

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void Openfile::OnNew(wxCommandEvent & event)
{
	wxFile *file = new wxFile(wxT("aaa.txt"));
    //exists函数是静态函数 
	if(wxFile::Exists(wxT("aaa.txt")) == false)
	{
		file->Create(wxT("aaa.txt"));
	}
}

②Open——打开文件读取其内容

void Openfile::OnOpen(wxCommandEvent & event)
{
    //将读取的文件字符串 显示到文件对话框内
	wxFileDialog *openFileDialog = new wxFileDialog(this);
    //如果控件成功显示
	if(openFileDialog->ShowModal() == wxID_OK)
	{
		wxString fileName = openFileDialog->GetPath();
		tc->LoadFile(fileName);
	}
}

③Save——保存字符串至文件中

void Openfile::OnSave(wxCommandEvent & event)
{
	wxFileDialog *openFileDialog = new wxFileDialog(this);

	if(openFileDialog->ShowModal() == wxID_OK)
	{
		wxString fileName = openFileDialog->GetPath();
		tc->SaveFile(fileName);	
	}	
}

贴出全部代码

#include <wx/wx.h>
#include <wx/file.h>

class Openfile : public wxFrame
{
public:
	Openfile(const wxString & title);

	void OnOpen(wxCommandEvent & event);
	void OnSave(wxCommandEvent & event);
	void OnNew(wxCommandEvent & event);
	wxTextCtrl * tc;
};

Openfile::Openfile(const wxString & title)
	:wxFrame(NULL, -1 , title, wxPoint(-1, -1), wxSize(300, 240))
{
	wxMenuBar *menubar = new wxMenuBar;
	wxMenu * file = new wxMenu;
	wxBoxSizer *vbox = new wxBoxSizer(wxVERTICAL);
	wxBoxSizer *hbox1 = new wxBoxSizer(wxHORIZONTAL);
	wxBoxSizer *hbox2 = new wxBoxSizer(wxHORIZONTAL);

	
	file->Append(wxID_OPEN, wxT("&Open"));
	file->Append(wxID_NEW, wxT("&New"));
	menubar->Append(file, wxT("&File"));
	SetMenuBar(menubar);

	Connect(wxID_OPEN, wxEVT_COMMAND_MENU_SELECTED,
		wxCommandEventHandler(Openfile::OnOpen));
	Connect(wxID_NEW, wxEVT_COMMAND_MENU_SELECTED,
		wxCommandEventHandler(Openfile::OnNew));
	
	tc = new wxTextCtrl(this, -1, wxT(""), wxPoint(-1, -1),
		wxSize(-1,-1), wxTE_MULTILINE);

	hbox1->Add(tc);
	wxButton *save = new wxButton(this, wxID_SAVE, wxT("&Save"));
	wxButton *ok = new wxButton(this, -1, wxT("&Ok"));
	Connect(wxID_SAVE, wxEVT_COMMAND_BUTTON_CLICKED,
		wxCommandEventHandler(Openfile::OnSave));
	hbox2->Add(save);
	hbox2->Add(ok);
	vbox->Add(hbox1, 1, wxEXPAND);
	vbox->Add(hbox2, 0, wxALIGN_RIGHT | wxRIGHT | wxBOTTOM, 10);
	SetSizer(vbox);

	Center();
}

void Openfile::OnNew(wxCommandEvent & event)
{
	wxFile *file = new wxFile(wxT("aaa.txt"));
	if(wxFile::Exists(wxT("aaa.txt")) == false)
	{
		file->Create(wxT("aaa.txt"));
	}
}

void Openfile::OnSave(wxCommandEvent & event)
{
	wxFileDialog *openFileDialog = new wxFileDialog(this);

	if(openFileDialog->ShowModal() == wxID_OK)
	{
		wxString fileName = openFileDialog->GetPath();
		tc->SaveFile(fileName);	
	}	
}

void Openfile::OnOpen(wxCommandEvent & event)
{
	wxFileDialog *openFileDialog = new wxFileDialog(this);

	if(openFileDialog->ShowModal() == wxID_OK)
	{
		wxString fileName = openFileDialog->GetPath();
		tc->LoadFile(fileName);
	}
}

class MyApp : public wxApp
{
public:
	virtual bool OnInit();
};

IMPLEMENT_APP(MyApp)

bool MyApp::OnInit()
{
	Openfile *open = new Openfile(wxT("Openfile"));
	open->Show(true);
	return true;
}

欢迎大家留言，点评，谢谢。

wxWidget入门（六）

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