呼叫系統的檔案開啟、儲存對話方塊

SaveOrOpen.h

#define _CRT_SECURE_NO_WARNINGS
#pragma once

#include"stdafx.h"
#include<afx.h>
#include<afxdlgs.h>

#define POSTFIX _T("文字(*.txt)|*.txt|所有檔案(*.*)|*.*||")   //開啟、儲存檔案時的預設型別
#define _DEFAULT_ _T(".txt")                     //預設型別

//nType
#define ANSI      0x01
#define _UNICODE  0x02
#define UTF8      0x03
#define UTF16     0x04

class SaveOrOpen
{
private:
	CFile m_file;
	CString m_Path;
	CString OpenANSI(CFile & file);
	void SaveANSI(CFile &file, CString szStr);
public:
	SaveOrOpen();
	~SaveOrOpen();
public:
	CString Open(LPCTSTR szPath);
	void Save(LPCTSTR szPath, CString szStr, int nType = ANSI);
public:
	//呼叫系統的對話方塊
	//檔案開啟對話方塊，獲取對應的路徑
	UINT OpenFileDialog(TCHAR *Default = _DEFAULT_, TCHAR *Postfix = POSTFIX);
	//檔案儲存對話方塊，獲取儲存檔案的路徑
	UINT SaveFileDialog(TCHAR *Default = _DEFAULT_, TCHAR *Postfix = POSTFIX);
	CString GetPath()const;
	CString GetFileName();
private:
	//Unicode轉成CHAR* 型別的字串
	void WideToStr(LPCOLESTR wcstr, char *chResult);
};
 

SaveOrOpen.cpp

#include "stdafx.h"
#include "SaveOrOpen.h"

#define w CFile::modeCreate|CFile::modeReadWrite
#define r CFile::modeRead
#define h CFile::begin

SaveOrOpen::SaveOrOpen()
{
}


SaveOrOpen::~SaveOrOpen()
{
}

UINT SaveOrOpen::OpenFileDialog(TCHAR *Default, TCHAR *Postfix)
{
	//TRUE是開啟檔案   Default是預設   Postfix可選的字尾名
	CFileDialog dlg(TRUE, Default, NULL, 0, Postfix);
	INT_PTR n = dlg.DoModal();
	if (n == IDCANCEL)
		return IDCANCEL;
	m_Path = dlg.GetPathName();
	return IDOK;
}

UINT SaveOrOpen::SaveFileDialog(TCHAR * Default, TCHAR * Postfix)
{
	//FALSE是檔案儲存  Default是預設的字尾名  Postfix是可選的字尾名
	CFileDialog dlg(FALSE, Default, NULL, 0, Postfix);
	INT_PTR n = dlg.DoModal();
	if (n == IDCANCEL)
		return IDCANCEL;
	m_Path = dlg.GetPathName();
	return IDOK;
}

CString SaveOrOpen::GetPath() const
{
	return m_Path;
}

CString SaveOrOpen::GetFileName()
{
	return m_file.GetFileName();
}

CString SaveOrOpen::Open(LPCTSTR szPath)
{
	m_file.Open(szPath, r);
	TCHAR s;
	m_file.Read(&s, sizeof(s));
	switch (s)
	{
	case 0xFEFF:
		break;
	default:
		return OpenANSI(m_file);
		break;
	}
}

CString SaveOrOpen::OpenANSI(CFile & file)
{
	ULONGLONG fileSize = file.GetLength();
	CHAR *szStr = new CHAR[fileSize + 1];
	CString Str;

	m_file.Seek(0, h);

	int n = file.Read(szStr, fileSize);
	szStr[n] = 0;

	Str = szStr;
	return Str;
}

//儲存
void SaveOrOpen::Save(LPCTSTR szPath, CString szStr, int nType)
{
	m_file.Open(szPath, w);
	switch (nType)
	{
	case ANSI:
		SaveANSI(m_file, szStr);
		break;
	case _UNICODE:
		break;
	case UTF8:
		break;
	case UTF16:
		break;
	default:
		break;
	}
}

void SaveOrOpen::SaveANSI(CFile & file, CString szStr)
{
	int nLen = szStr.GetLength();
	int n = (nLen * 2) + 1;
	char *Buff = new char[n];
	WideToStr(szStr, Buff);
	file.Write(Buff, n);
	delete []Buff;
}

void SaveOrOpen::WideToStr(LPCOLESTR wcstr,char *chResult)
{
	size_t wLen = wcslen(wcstr) + 1;  // 寬字元字元長度，+1表示包含字串結束符
	int aLen = WideCharToMultiByte(CP_ACP, 0, wcstr, wLen, NULL, 0, NULL, NULL); //第六個引數為0，返回轉換所需的char型字元數

	LPSTR lpa = new char[aLen];	//申請緩衝區
	int n = WideCharToMultiByte(CP_ACP, 0, wcstr, wLen, lpa, aLen, NULL, NULL);	//將UNICODE字符集轉換到char型緩衝區
	strcpy(chResult, lpa);//記憶體拷貝
	delete[] lpa;		//釋放緩衝區記憶體
	lpa = NULL;		//緩衝區記憶體指標設定為null
}