RichEdit读写文件
一个小demo：
HWND RichEdit;
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;
RECT rcClient;
hInst = LoadLibrary(TEXT("RICHED20.dll"));
hInst = hInstance; // 将实例句柄存储在全局变量中
hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
GetClientRect(hWnd,&rcClient);
RichEdit = CreateWindowEx(WS_EX_CLIENTEDGE,
TEXT("RichEdit20A"),NULL,
ES_MULTILINE | WS_CHILD |WS_VISIBLE |WS_VSCROLL |WS_HSCROLL | ES_WANTRETURN,
10, 10, rcClient.right-50, rcClient.bottom-50,
hWnd, 0, hInstance, NULL);
FileInitialize (hWnd) ;
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
在WndProc中需要加入以下代码：
case IDM_Open:
{
ZeroMemory(&ofn,sizeof (ofn));
ZeroMemory(szFileName,MAX_PATH);
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hWnd;
ofn.lpstrFile = szFileName;
ofn.nMaxFile = sizeof(szFileName);
ofn.lpstrFilter = TEXT("Text File(*.txt)/0*.txt/0All File(*.*)/0*.*");
ofn.nFilterIndex = 1;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;
ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
if (GetOpenFileName(&ofn) == FALSE)
break;
LoadFromFile(RichEdit,szFileName);
break;
}
break;
case IDM_Save:
{
SaveFile(szFileName,256);
SaveToFile(RichEdit,szFileName);
}
break;
由于文件处理比较繁琐，所以单提出来一个file.cpp头文件:
#include <windows.h>
#include <commdlg.h>
static OPENFILENAME ofn ;
void FileInitialize (HWND hwnd)
{
static TCHAR szFilter[] = TEXT ("Text Files (*.TXT)\0*.txt\0") \
TEXT ("ASCII Files (*.ASC)\0*.asc\0") \
TEXT ("All Files (*.*)\0*.*\0\0") ;
ofn.lStructSize = sizeof (OPENFILENAME) ;
ofn.hwndOwner = hwnd ;
ofn.hInstance = NULL ;
ofn.lpstrFilter = szFilter ;
ofn.lpstrCustomFilter = NULL ;
ofn.nMaxCustFilter = 0 ;
ofn.nFilterIndex = 0 ;
ofn.lpstrFile = NULL ;
ofn.nMaxFile = MAX_PATH ;
ofn.lpstrFileTitle = NULL ;
ofn.nMaxFileTitle = MAX_PATH ;
ofn.lpstrInitialDir = NULL ;
ofn.lpstrTitle = NULL ;
ofn.Flags = 0 ;
ofn.nFileOffset = 0 ;
ofn.nFileExtension = 0 ;
ofn.lpstrDefExt = TEXT ("txt") ;
ofn.lCustData = 0L ;
ofn.lpfnHook = NULL ;
ofn.lpTemplateName = NULL ;
}
BOOL FileOpenDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
{
ofn.hwndOwner = hwnd ;
ofn.lpstrFile = pstrFileName ;
ofn.lpstrFileTitle = pstrTitleName ;
ofn.Flags = OFN_HIDEREADONLY | OFN_CREATEPROMPT ;
return GetOpenFileName (&ofn) ;
}
BOOL FileSaveDlg (HWND hwnd, PTSTR pstrFileName, PTSTR pstrTitleName)
{
ofn.hwndOwner = hwnd ;
ofn.lpstrFile = pstrFileName ;
ofn.lpstrFileTitle = pstrTitleName ;
ofn.Flags = OFN_OVERWRITEPROMPT ;
return GetSaveFileName (&ofn) ;
}
BOOL FileRead (HWND hwndEdit, PTSTR pstrFileName)
{
BYTE bySwap ;
DWORD dwBytesRead ;
HANDLE hFile ;
int i, iFileLength, iUniTest ;
PBYTE pBuffer, pText, pConv ;
if (INVALID_HANDLE_VALUE ==
(hFile = CreateFile (pstrFileName, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, NULL)))
return FALSE ;
iFileLength = GetFileSize (hFile, NULL) ;
pBuffer = (PBYTE)malloc(iFileLength + 2) ;
ReadFile (hFile, pBuffer, iFileLength, &dwBytesRead, NULL) ;
CloseHandle (hFile) ;
pBuffer[iFileLength] = '\0' ;
pBuffer[iFileLength + 1] = '\0' ;
iUniTest = IS_TEXT_UNICODE_SIGNATURE | IS_TEXT_UNICODE_REVERSE_SIGNATURE ;
if (IsTextUnicode (pBuffer, iFileLength, &iUniTest))
{
pText = pBuffer + 2 ;
iFileLength -= 2 ;
if (iUniTest & IS_TEXT_UNICODE_REVERSE_SIGNATURE)
{
for (i = 0 ; i < iFileLength / 2 ; i++)
{
bySwap = ((BYTE *) pText) [2 * i] ;
((BYTE *) pText) [2 * i] = ((BYTE *) pText) [2 * i + 1] ;
((BYTE *) pText) [2 * i + 1] = bySwap ;
}
}
pConv = (PBYTE)malloc(iFileLength + 2) ;
#ifndef UNICODE
WideCharToMultiByte (CP_ACP, 0, (PWSTR) pText, -1, (LPSTR)pConv,
iFileLength + 2, NULL, NULL) ;
#else
lstrcpy ((PTSTR) pConv, (PTSTR) pText) ;
#endif
}
else
{
pText = pBuffer ;
pConv = (PBYTE)malloc (2 * iFileLength + 2) ;
#ifdef UNICODE
// MultiByteToWideChar (CP_ACP, 0, pText, -1, (PTSTR) pConv,
// iFileLength + 1) ;
;
#else
lstrcpy ((PTSTR) pConv, (PTSTR) pText) ;
#endif
}
SetWindowText (hwndEdit, (PTSTR) pConv) ;
free (pBuffer) ;
free (pConv) ;
return TRUE ;
}
BOOL FileWrite (HWND hwndEdit, PTSTR pstrFileName)
{
DWORD dwBytesWritten ;
HANDLE hFile ;
int iLength ;
PTSTR pstrBuffer ;
WORD wByteOrderMark = 0xFEFF ;
if (INVALID_HANDLE_VALUE ==
(hFile = CreateFile (pstrFileName, GENERIC_WRITE, 0,
NULL, CREATE_ALWAYS, 0, NULL)))
return FALSE ;
iLength = GetWindowTextLength (hwndEdit) ;
pstrBuffer = (PTSTR) malloc ((iLength + 1) * sizeof (TCHAR)) ;
if (!pstrBuffer)
{
CloseHandle (hFile) ;
return FALSE ;
}
#ifdef UNICODE
WriteFile (hFile, &wByteOrderMark, 2, &dwBytesWritten, NULL) ;
#endif
GetWindowText (hwndEdit, pstrBuffer, iLength + 1) ;
WriteFile (hFile, pstrBuffer, iLength * sizeof (TCHAR),
&dwBytesWritten, NULL) ;
if ((iLength * sizeof (TCHAR)) != (int) dwBytesWritten)
{
CloseHandle (hFile) ;
free (pstrBuffer) ;
return FALSE ;
}
CloseHandle (hFile) ;
free (pstrBuffer) ;
return TRUE ;
}
void OkMessage (HWND hwnd, TCHAR * szMessage, TCHAR * szTitleName)
{
TCHAR szBuffer[64 + MAX_PATH] ;
wsprintf (szBuffer, szMessage, szTitleName[0] ? szTitleName : _T("UNTITLED")) ;
MessageBox (hwnd, szBuffer, NULL, MB_OK | MB_ICONEXCLAMATION) ;
}
BOOL LoadFromFile(HWND hEdit,LPCTSTR lpFileName)
{
HANDLE hFile = NULL;
HANDLE hFileMapping = NULL;
LPCTSTR lpData = NULL;
hFile = CreateFile(lpFileName,GENERIC_READ,FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
if (INVALID_HANDLE_VALUE == hFile)
{
return FALSE;
}
hFileMapping = CreateFileMapping(hFile,NULL,PAGE_READONLY | SEC_COMMIT,0,0,NULL);
if (NULL == hFileMapping)
{
CloseHandle(hFile);
return FALSE;
}
lpData = (LPCTSTR)MapViewOfFile(hFileMapping,FILE_MAP_READ,0,0,0);
if (lpData == NULL)
{
CloseHandle(hFileMapping);
CloseHandle(hFile);
}
SetWindowText(hEdit,lpData);
UnmapViewOfFile(lpData);
CloseHandle(hFileMapping);
CloseHandle(hFile);
return TRUE;
}
BOOL SaveToFile(HWND hEdit,LPCTSTR lpFileName)
{
HANDLE hFile = NULL;
HANDLE hFileMapping = NULL;
LPTSTR lpData = NULL;
int nTextLength = 0;
hFile = CreateFile(lpFileName,GENERIC_READ | GENERIC_WRITE,FILE_SHARE_READ | FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
if (INVALID_HANDLE_VALUE == hFile)
{
return FALSE;
}
nTextLength = GetWindowTextLength(hEdit) + 1;
hFileMapping = CreateFileMapping(hFile,NULL,PAGE_READWRITE,0,nTextLength,NULL);
if (NULL == hFileMapping)
{
CloseHandle(hFile);
return FALSE;
}
lpData = (LPTSTR)MapViewOfFile(hFileMapping,FILE_MAP_WRITE,0,0,0);
if (lpData == NULL)
{
CloseHandle(hFileMapping);
CloseHandle(hFile);
}
GetWindowText(hEdit,lpData,nTextLength);
FlushViewOfFile(lpData,nTextLength);
UnmapViewOfFile(lpData);
CloseHandle(hFileMapping);
CloseHandle(hFile);
return TRUE;
}
bool SaveFile(LPTSTR lpFileName,int nLength)
{
OPENFILENAME ofn;
ZeroMemory(&ofn,sizeof (ofn));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = NULL;
ofn.lpstrFile = lpFileName;
ofn.nMaxFile = nLength;
ofn.lpstrFilter = TEXT("Text File(*.txt)/0*.txt/0All File(*.*)/0*.*");
ofn.nFilterIndex = 1;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;
ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
if (GetSaveFileName(&ofn) == FALSE)
return false;
lstrcat(lpFileName,TEXT(".txt"));
return true;
}