這一期是為了解決（三）中關於檔案操作的歷史遺留問題。

其實這一期不出也沒什麼關係，我相信如果大家有詳細跟著我的學習筆記一步步敲下來。會看官方文件，應該問題不大。

解題思路：

嘗試：

既然是檔案操作，聯絡老外的命名規則，再怎麼著總有一個類是有帶"file"的類吧，無非是加了一個"商標" —— "wx" 而已

通過搜尋得到一個連結https://docs.wxwidgets.org/trunk/classwx_file.html

包的標頭檔案就是

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

先講一個前提

檔案的根目錄

①New——新建一個檔案

我這裡就簡單示範下，預設是新建"aaa.txt"，如果存在就不新建了。

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

②Open——開啟檔案讀取其內容

void Openfile::OnOpen(wxCommandEvent & event)
{
    //將讀取的檔案字串 顯示到檔案對話方塊內
	wxFileDialog *openFileDialog = new wxFileDialog(this);
    //如果控制元件成功顯示
	if(openFileDialog->ShowModal() == wxID_OK)
	{
		wxString fileName = openFileDialog->GetPath();
		tc->LoadFile(fileName);
	}
}
 

③Save——儲存字串至檔案中

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

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

貼出全部程式碼

#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;
}
 

歡迎大家留言，點評，謝謝。