MFC question

Jeg er ikke sikker på at jeg forstår spørgsmålet,

Vil du lave en applikation der læser en fil, viser det i en edit box og skriver det tilbage til filen? Er der nogen speciel grund til at input skal se ud på den måde?

Er der nogen grund til at blande mfc ind i det?

Hvordan åbner du en editbox? Komunikkere med brugeren så han/hun skriver sin input
på edit boxen og programmet læser inputet?  Og det skal ske i win32 omgivelser.

En text editor der er ca. så simpel som det kan blive:

#include <windows.h>
#include <commctrl.h>
#include <fstream>

char CurrentFileName[256];

enum CommandEnum
{
  FileOpenCmd = 1025,
  FileSaveCmd,
  FileCloseCmd,
  AboutCmd,
};

enum WindowCtrlId
{
  EditWindowId = 130
};

HINSTANCE InstanceHandle;
HWND  MainWindow, EditWindow;

void OnFileSave();

bool ReadFile(const char *aFileName)
{
  std::ifstream File(aFileName);
  if(!File)
      return false;
  std::string Line, Text;
  while(std::getline(File, Line))
  {
      Text += Line.c_str();
      Text += "\r\n";
  }
  SendMessage(EditWindow, WM_SETTEXT, 0, (LPARAM )Text.c_str());
  return true;
}

void OnFileOpen()
{
  if(SendMessage(EditWindow, EM_GETMODIFY, 0, 0))
  {
      if(MessageBox(MainWindow, "The current file has been modified\r\nDo you wan't to save it before closing?", "TextEd", MB_YESNO | MB_ICONQUESTION) == IDYES)
      {
        OnFileSave();
      }
  }
  static char Filter[] = "txt (*.txt)\0*.txt\0All (*.*)\0*.*\0";
  OPENFILENAME OpenFilename;
  memset(&OpenFilename, 0, sizeof(OpenFilename));
  OpenFilename.lStructSize = sizeof(OpenFilename);
  OpenFilename.hwndOwner = MainWindow;
  OpenFilename.hInstance = InstanceHandle;
  OpenFilename.lpstrFilter = Filter;
  OpenFilename.lpstrFile = CurrentFileName;
  OpenFilename.nMaxFile = sizeof(CurrentFileName);
  OpenFilename.Flags = OFN_FILEMUSTEXIST;
  OpenFilename.lpstrDefExt = "txt";

  if(GetOpenFileName(&OpenFilename))
  {
      if(!ReadFile(CurrentFileName))
      {
        CurrentFileName[0] = 0;
        std::string Msg = "Failed to open:\r\n";
        Msg += CurrentFileName;
        MessageBox(MainWindow, Msg.c_str(), "TextEditor", MB_OK | MB_ICONWARNING);
      }
  }
}

void OnFileSave()
{
  if(CurrentFileName[0] == 0)
  {  // Need to Get A filename
      static char Filter[] = "txt (*.txt)\0*.txt\0All (*.*)\0*.*\0";
      OPENFILENAME OpenFilename;
      memset(&OpenFilename, 0, sizeof(OpenFilename));
      OpenFilename.lStructSize = sizeof(OpenFilename);
      OpenFilename.hwndOwner = MainWindow;
      OpenFilename.hInstance = InstanceHandle;
      OpenFilename.lpstrFilter = Filter;
      OpenFilename.lpstrFile = CurrentFileName;
      OpenFilename.nMaxFile = sizeof(CurrentFileName);
      OpenFilename.Flags = 0;
      OpenFilename.lpstrDefExt = "txt";
      if(!GetSaveFileName(&OpenFilename))
      {
        CurrentFileName[0] = 0;
        return;
      }
  }
  std::ofstream File(CurrentFileName, std::ios::binary);
  if(!File)
  {
      std::string Msg = "Failed to open:\r\n";
      Msg += CurrentFileName;
      MessageBox(MainWindow, Msg.c_str(), "TextEditor", MB_OK | MB_ICONWARNING);
      CurrentFileName[0] = 0;
      return;
  }
  int TextLength = GetWindowTextLength(EditWindow);
  char *Temp = new char [TextLength + 1];
  GetWindowText(EditWindow, Temp, TextLength + 1);
  File << Temp;
  delete [] Temp;
}

LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
  switch (msg)
  {
  case WM_DESTROY:
      if(SendMessage(EditWindow, EM_GETMODIFY, 0, 0))
      {
        if(MessageBox(MainWindow, "The current file has been modified\r\nDo you wan't to save it before closing?", "TextEd", MB_YESNO | MB_ICONQUESTION) == IDYES)
        {
            OnFileSave();
        }
      }
      PostQuitMessage(0);
      break;
  case WM_CREATE:
      MainWindow = hwnd;
      EditWindow = CreateWindow("EDIT",
                                "",
                                WS_VISIBLE | WS_VSCROLL | WS_CHILD | ES_MULTILINE | WS_HSCROLL,
                                20, 20, 100, 100,
                                MainWindow,
                                (HMENU )EditWindowId,
                                InstanceHandle,
                                0);

      if(CurrentFileName[0])
      {
        if(!ReadFile(CurrentFileName))
        {
            std::string Msg = "Failed to open:\r\n";
            Msg += CurrentFileName;
            MessageBox(hwnd, Msg.c_str(), "TextEd", MB_OK);
            CurrentFileName[0] = 0;
        }
      }
      SetFocus(EditWindow);
      break;
  case WM_COMMAND:
      switch(LOWORD(wParam))
      {
      case FileCloseCmd:
        PostQuitMessage(0);
        break;
      case FileOpenCmd:
        OnFileOpen();
        break;
      case FileSaveCmd:
        OnFileSave();
        break;
      case AboutCmd:
        MessageBox(MainWindow, "TextEditor\r\nCopyright Bertel Brander 2006", "TextEditor", MB_OK);
        break;
      }
      break;
  case WM_SIZE:
      RECT ClientRect;
      GetClientRect(hwnd, &ClientRect);
      MoveWindow(EditWindow, ClientRect.left, ClientRect.top, ClientRect.right - ClientRect.left, ClientRect.bottom - ClientRect.top, TRUE);
      break;
  default:
      return DefWindowProc(hwnd, msg, wParam, lParam);
  }
  return 0;
}

HWND CreateMainWindow()
{
  WNDCLASS wc;
  memset(&wc, 0, sizeof(WNDCLASS));
  wc.style = CS_HREDRAW | CS_VREDRAW  | CS_DBLCLKS ;
  wc.lpfnWndProc = (WNDPROC )MainWndProc;
  wc.hInstance = InstanceHandle;
  wc.hbrBackground = (HBRUSH )(COLOR_WINDOW + 1);
  wc.lpszClassName = "SimpleWinWndClass";
  wc.lpszMenuName = 0;
  wc.hCursor = LoadCursor(NULL, IDC_ARROW);
  wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
  if(!RegisterClass(&wc))
      return 0;

  HMENU FileMenu = CreateMenu();
  AppendMenu(FileMenu, MF_STRING, FileOpenCmd, "Open");
  AppendMenu(FileMenu, MF_STRING, FileSaveCmd, "Save");
  AppendMenu(FileMenu, MF_SEPARATOR, 0 , 0);
  AppendMenu(FileMenu, MF_STRING, FileCloseCmd, "Close");

  HMENU HelpMenu = CreateMenu();
  AppendMenu(HelpMenu, MF_STRING, AboutCmd, "About");

  HMENU MainMenu = CreateMenu();
  AppendMenu(MainMenu, MF_POPUP, (UINT )FileMenu, "File");
  AppendMenu(MainMenu, MF_POPUP, (UINT )HelpMenu, "Help");

  return CreateWindow("SimpleWinWndClass",
                      "Simple Text Editor",
                      WS_MINIMIZEBOX | WS_VISIBLE | WS_MAXIMIZEBOX |
                      WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_CAPTION |
                      WS_BORDER | WS_SYSMENU | WS_THICKFRAME,
                      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0,
                      0,
                      MainMenu,
                      InstanceHandle,
                      0);
}

int WINAPI WinMain(HINSTANCE Instance,
                  HINSTANCE,
                  LPSTR CmdLine,
                  INT)
{
  InstanceHandle = Instance;

  InitCommonControls();

  if(CmdLine[0])
  {
      strcpy(CurrentFileName, CmdLine);
  }
  if((MainWindow = CreateMainWindow()) == (HWND )0)
  {
      MessageBox(0, "Failed to create MainWindow!", "TextEditor", MB_OK);
      return 0;
  }
  ShowWindow(MainWindow, SW_SHOW);
  MSG Msg;
  while(GetMessage(&Msg, 0, 0, 0))
  {
      TranslateMessage(&Msg);
      DispatchMessage(&Msg);
  }
  return Msg.wParam;
}

bertelbrander
Det er bestemt ikke nemt. Det er bare dig der er ekspert. Jeg kan endue ikke kompilere men det går nok.
Tak for den tid du brugte for min opgave!

Det burde være trivielt at oversætte det, hvilke fejl får du nor du forsøger at bygge.

error C2039: 'getline' : is not a member of 'std'
error C2065: 'getline' : undeclared identifier


while(std::getline(File, Line)) // <- both errors happen in this line
{
Text += Line.c_str();
Text += "\r\n";
}

Der mangler en:

#include <string>

I toppen.

Tak,
Bertal, Jeg tro  jeg gave dig fuld point. Men jeg kan ikke se det i systemet her.
Tak for din indsats.

For at du kan give point skal den du vil give point have lagt et svar, hvis ikke denne har lavet et svar, beder man normalt ham om at gøre det.

Men jeg samler ikke på point, så lave selv et svar og accepter det, så bliver spørgsmålet markeret som lukket og du får dine point tilbage.

Fint

Så mangler du kun at acceptere dit svar, marker dit navn ude til venstre og tryk på Accepter.

Det har jeg gjort!

I så fald burde dit svar være markeret som accepteret.