ich bekomme immer doe fehler meldung : " invalid conversion 'void to 'car "

und der will irgentwas mit den beiden dinger haben:

buffer = malloc(iFileSize);
buffer = malloc(iLength);

wenn ich die aber weg lasse dann schreib der nicht miehr in die test.txt ...

hier der code:

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
    HWND     hWnd;
    MSG      msg;
    WNDCLASS wc;

    const char szAppName[] = "Editcontrol Tutorial";

    wc.style          = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc    = WndProc;
    wc.cbClsExtra     = 0;
    wc.cbWndExtra     = 0;
    wc.hInstance      = hInstance;
    wc.hIcon          = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground  = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
    wc.lpszMenuName   = NULL;
    wc.lpszClassName  = szAppName;

    RegisterClass(&wc);

    hWnd = CreateWindow( szAppName,
                         "Editcontrol Tutorial",
                         WS_OVERLAPPEDWINDOW,
                         CW_USEDEFAULT,
                         CW_USEDEFAULT,
                         CW_USEDEFAULT,
                         CW_USEDEFAULT,
                         NULL,
                         NULL,
                         hInstance,
                         NULL );

    ShowWindow(hWnd, iCmdShow);
    UpdateWindow(hWnd);

    while(GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

    static HWND hEdit;

    switch(message)
    {
    case WM_CREATE:
        {

            FILE *fz;
            char *buffer = NULL;
            int iFileSize;

            fz = fopen("text.txt", "rb");
            if(fz != NULL)
            {
                fseek(fz, 0, SEEK_END);
                iFileSize = ftell(fz);
                buffer = malloc(iFileSize);

                fseek(fz, 0, SEEK_SET);
                fread(buffer, 1, iFileSize, fz);
                fclose(fz);
            }

            hEdit = CreateWindowEx(WS_EX_CLIENTEDGE,
                                   "edit",
                                   buffer,    // <- das ist der Inhalt der Editfelds
                                   WS_CHILD | WS_VISIBLE | WS_VSCROLL | ES_MULTILINE |
                                              ES_AUTOVSCROLL,
                                   0, 0, 0, 0,
                                   hWnd,
                                   NULL,
                                   ((LPCREATESTRUCT) lParam) -> hInstance,
                                   NULL);

            free(buffer);

            return 0;
        }
    case WM_SIZE:
        {

            MoveWindow(hEdit, 0, 0, LOWORD(lParam), HIWORD(lParam), TRUE);
            return 0;
        }
    case WM_CLOSE:
        {

            FILE *fz;
            char *buffer = NULL;
            int iLength;

            iLength = GetWindowTextLength(hEdit);

            buffer = malloc(iLength);

            GetWindowText(hEdit, buffer, iLength+1);

            fz = fopen("text.txt", "wb");
            fwrite(buffer, 1, iLength, fz);
            fclose(fz);

            free(buffer);

            DestroyWindow(hWnd);
            return 0;
        }
    case WM_DESTROY:
        {
            PostQuitMessage(0);
            return 0;
        }
    }
    return DefWindowProc(hWnd, message, wParam, lParam);
}

buffer = (char *) malloc(iFileSize);
buffer = (char *) malloc(iLength);

Malloc liefert einen Zeiger auf void muss, da C++-Compiler das nicht akzeptieren, gecastet (explizite Typenumwandlung) werden.

Wenn du für buffer keinen Speicherplatz reservierst, kann GetWindowText dort nicht den Text reinschreiben.

GetWindowText(hEdit, buffer, iLength+1);

Folglich wird in die Datei die leere Variable buffer via

fwrite(buffer, 1, iLength, fz)

geschrieben.

MfG WilMen :xmas1:

ich hab alles genau so gemacht wie du wolltes

#include <windows.h>
#include <stdio.h>
#include <stdlib.h> 

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hI, HINSTANCE hPrI, PSTR szCmdLine, int iCmdShow)
{
 char szName[] = "Fensterklasse";
 HBRUSH MyBrush = CreateSolidBrush( RGB( 212, 208, 200 ) );
 WNDCLASS wc;

 wc.style         = CS_HREDRAW | CS_VREDRAW;
 wc.lpfnWndProc   = WndProc;
 wc.cbClsExtra    = 0;
 wc.cbWndExtra    = 0;
 wc.hInstance     = hI;
 wc.hIcon         = LoadIcon (NULL, IDI_WINLOGO);
 wc.hCursor       = 0;
 wc.hbrBackground = MyBrush;
 wc.lpszMenuName  = NULL;
 wc.lpszClassName = szName;

 RegisterClass (&wc);

 HWND hwnd = CreateWindow (szName, "PPH", WS_OVERLAPPEDWINDOW,
                            0, 0, 400, 100, NULL, NULL, hI, NULL);
 ShowWindow   (hwnd, iCmdShow);
 UpdateWindow (hwnd);

//-----------------------------------------------------------------------------------

  MSG msg;

  while (GetMessage (&msg, NULL, 0, 0))
  {
    TranslateMessage (&msg);
    DispatchMessage  (&msg);
  }
  return msg.wParam;
} 
LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 HDC hdc;
 PAINTSTRUCT ps;
 static HWND hwndEdit1, hwndEdit2 ,hwndEdit3;

 switch (message)
 {
  case WM_PAINT:
      hdc = BeginPaint (hwnd, &ps);
      SetTextColor(hdc, RGB(0,0,0) );
      SetBkColor(hdc, RGB(212,208,200) );
      TextOut (hdc, 20, 10, "Name:", 5);
      TextOut (hdc, 20, 30, "Icq Adresse:", 12);
      TextOut (hdc, 20, 50, "Icq Passwort:", 13);
      EndPaint (hwnd, &ps);
  return 0;

  case WM_CREATE :
  {

   FILE *fz;
            char *buffer = NULL;
            int iFileSize;

            fz = fopen("text.txt", "rb");
            if(fz != NULL)
            {
                fseek(fz, 0, SEEK_END);
                iFileSize = ftell(fz);
                buffer = (char *) malloc(iFileSize); 
                fseek(fz, 0, SEEK_SET);
                fread(buffer, 1, iFileSize, fz);
                fclose(fz);
            }

  hwndEdit1   = CreateWindow ( "edit", "",
                                   WS_CHILD | WS_VISIBLE ,
                                   150, 10, 100, 16, hwnd, (HMENU)2,
                                   (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE), NULL); 

  hwndEdit2  = CreateWindow ( "edit", "",
                                   WS_CHILD | WS_VISIBLE ,
                                   150, 30, 100, 16, hwnd, (HMENU)2,
                                   (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE), NULL); 

  hwndEdit3  = CreateWindow ( "edit", "",
                                   WS_CHILD | WS_VISIBLE| ES_PASSWORD,
                                   150, 50, 100, 16, hwnd, (HMENU)2,
                                   (HINSTANCE) GetWindowLong (hwnd, GWL_HINSTANCE), NULL); 
  free(buffer); 
  return 0;
}
  case WM_COMMAND:
      switch(LOWORD(wParam))
      {

      case 1:
           SetWindowText(hwndEdit2,"");
           SendMessage(hwndEdit2, EM_SETREADONLY, TRUE, 0);
      break;
      case 2:
           SendMessage(hwndEdit2, EM_SETREADONLY, FALSE, 0);
      break;
      }
  return 0;

 case WM_CLOSE:
 {
  FILE *fz;
  char* buffer = NULL;
  int  iLength;
  iLength = GetWindowText(hwndEdit1, buffer, iLength+1);
  iLength = GetWindowText(hwndEdit2, buffer, iLength+2);
  iLength = GetWindowText(hwndEdit3, buffer, iLength+3);
  buffer = (char *) malloc(iLength);
  GetWindowText(hwndEdit1, buffer, iLength+1);
  fz = fopen("text.txt", "wb");
  fwrite(buffer, 1, iLength, fz);
  fwrite(buffer, 2, iLength, fz);
  fwrite(buffer, 3, iLength, fz);
  fclose(fz);
  free(buffer);
  DestroyWindow(hwnd);
  return 0;
  } 

  case WM_DESTROY:
      PostQuitMessage (0);
  return 0;
 }

 return DefWindowProc (hwnd, message, wParam, lParam);
}