[SDK programming] similar to Microsoft notepad V2.0

Update:
ICO replaced .....
Added the font and color selection function;
Fixed:
The resource files have been packaged into the project directory, and the paths have been changed to relative paths;
It solves the problem that data will be lost when files larger than Kb are saved.

 

Core code:
#include "resource.h"
#include <windows.h>
#include <stdio.h>
#include <Richedit.h>
#include <shlwapi.h>
#pragma comment (lib, "shlwapi.lib")
#define WM_FILENAME WM_USER + 1 // Custom message, this message is used to send the full path of the file selected by the user
#define OPEN WM_USER + 2 // A Flag to indicate whether this file is selected in the open dialog or save dialog
#define SAVE WM_USER + 3

INT_PTR ExitCode1; // Used to save the exit code of the main dialog
INT_PTR ExitCode2; // Exit code of About dialog
HINSTANCE hMain; // Used to save the instance handle
// The main dialog procedure function declaration
INT_PTR CALLBACK DialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);
// About dialog procedure function declaration
INT_PTR CALLBACK AboutProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam);

BOOL OnInitDialog (HWND hwndDlg); // The function called when the corresponding WM_ONINITDIALOG message
BOOL OnOpen (HWND hwndDlg, DWORD Flag); // Called when the user clicks the Open menu item
// void GetTitle (char * pSourceBuf, char * pDestBuf);
void ChooseFont (HWND hwndDlg, CHOOSEFONT & font, LOGFONT & log);

int WINAPI WinMain (HINSTANCE hIns, HINSTANCE hPrev, LPSTR lpCmd, int nShowCmd) // Entry function
{
    LoadLibrary ("Riched20.dll"); // To use the Rich Edit control, you must first load this library, otherwise the program cannot run
    hMain = hIns;
    ExitCode1 = DialogBox (hIns, MAKEINTRESOURCE (IDD_DIALOG1), NULL, DialogProc); // Create the main dialog
    return 0;
}

// The main dialog procedure function
INT_PTR CALLBACK DialogProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_INITDIALOG: // initialization
        OnInitDialog (hwndDlg);
        break;
    // When the user changes the size of the main dialog, the size of the Edit control should also change.
    case WM_SIZE:
        {
            RECT rect;
            ZeroMemory (& rect, sizeof (RECT));
            GetWindowRect (hwndDlg, & rect); // Get the size of the main dialog window, see MSDN for details
            HWND hEdit = GetDlgItem (hwndDlg, IDC_TEXT);
            // Change the size of the Edit control
            SetWindowPos (hEdit, HWND_TOP, 0,0, rect.right-rect.left-5, rect.bottom-rect.top-50, SWP_SHOWWINDOW);
            CloseHandle (hEdit);

        }
        break;
    case WM_COMMAND:
        if (IDM_OPEN == wParam) // Open is clicked by the user
            OnOpen (hwndDlg, OPEN);
        if (IDM_EXIT == wParam) // Exit is clicked by the user
            SendMessage (hwndDlg, WM_CLOSE, NULL, NULL); // Send WM_CLOSE message
        if (IDM_ABOUT == wParam) // About is clicked to create an ABOUT dialog
            ExitCode2 = DialogBox (hMain, MAKEINTRESOURCE (IDD_ABOUT), hwndDlg, AboutProc);
        if (IDM_SAVE == wParam) // The user clicks Save
        {
          
            OnOpen (hwndDlg, SAVE);
        }
        if (IDM_CLOSEFILE == wParam)
        {
            SetDlgItemText (hwndDlg, IDC_TEXT, "");
            SetWindowText (hwndDlg, "NotePadV2.0 By 小 司");
        }
        if (IDM_FORMAT == LOWORD (wParam))
        {
            LOGFONT log;
            CHOOSEFONT font;
            CHARFORMAT2 cm;
            ZeroMemory (& cm, sizeof (cm));

            ChooseFont (hwndDlg, font, log);
            if (ChooseFont (& font))
            {

                strcpy (cm.szFaceName, log.lfFaceName);
                cm.cbSize = sizeof (cm);
                cm.dwMask = CFM_FACE | CFM_SIZE | CFM_WEIGHT | CFM_COLOR;
                cm.yHeight = log.lfHeight * log.lfHeight;
                cm.wWeight = log.lfWeight;
                cm.bPitchAndFamily = log.lfPitchAndFamily;
                cm.crTextColor = font.rgbColors;

                HWND hText = GetDlgItem (hwndDlg, IDC_TEXT);
                SendMessage (hText, EM_SETCHARFORMAT, SCF_ALL, (LPARAM) & cm);
            }
           
        }
        break;
    case WM_FILENAME: // custom message, used to receive file path
        if (OPEN == lParam)
        {
            // The purpose of opening the file is to get the file size using the GetFileSize function
            HANDLE hFile = CreateFile ((LPCSTR) wParam, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
                                FILE_ATTRIBUTE_NORMAL, NULL);
            if (INVALID_HANDLE_VALUE == hFile)
            {
                MessageBox (hwndDlg, "Open File Failed!", "Error", 0);
                CloseHandle (hFile);
                break;
            }
            DWORD dwFileSize = GetFileSize (hFile, NULL); // Get file size
            CloseHandle (hFile);

            TCHAR * pszData = new TCHAR [dwFileSize];
            memset (pszData, 0, dwFileSize);
           
            FILE * fp = fopen ((char *) wParam, "r"); // The path of the file saved in wParam
            fread (pszData, dwFileSize, 1, fp);
            fclose (fp);
            SetDlgItemText (hwndDlg, IDC_TEXT, pszData); // Display data
        }

        if (SAVE == lParam)
        {
            HWND hText = GetDlgItem (hwndDlg, IDC_TEXT);
            int len = GetWindowTextLength (hText);

            TCHAR * pBuf = new TCHAR [len];
            memset (pBuf, 0, len);
            GetDlgItemText (hwndDlg, IDC_TEXT, pBuf, len);

            char szFilePath [MAX_PATH + 10];
            sprintf_s (szFilePath, "% s.txt", (char *) wParam); // To make up.txt

            FILE * fp = fopen (szFilePath, "w");
            fwrite (pBuf, 1, len, fp);
            fclose (fp);
        }
        break;
        // This message is useless, for debugging ..
    case WM_LBUTTONDOWN:

        break;
    case WM_CLOSE:
        if (IDYES == MessageBox (hwndDlg, "Are you sure to exit?", "Warming", MB_YESNO | MB_ICONWARNING)))
        {
            EndDialog (hwndDlg, ExitCode1);
            break;
        }
        break;
    default:
        break;
    }
    return FALSE;
}

// about window procedure function
INT_PTR CALLBACK AboutProc (HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_CLOSE:
        EndDialog (hwndDlg, ExitCode2);
        break;
    case WM_COMMAND:
        if (IDOK == wParam)
        {
            SendMessage (hwndDlg, WM_CLOSE, NULL, NULL);
        }
        break;
    default:
        break;
    }
    return FALSE;
}
BOOL OnInitDialog (HWND hwndDlg)
{
    HICON hIcon = LoadIcon (hMain, MAKEINTRESOURCE (IDI_ICON1)); // Load icon
    SendMessage (hwndDlg, WM_SETICON, ICON_SMALL, (LPARAM) hIcon); // Set icon
    return TRUE;
}
BOOL OnOpen (HWND hwndDlg, DWORD Flag)
{
    // See the description of GetOpenFileName in MSDN
    TCHAR szFile [MAX_PATH];
    TCHAR szFileTitle [MAX_PATH];
    OPENFILENAME op;
    memset (szFile, 0, MAX_PATH);
    memset (szFileTitle, 0, MAX_PATH);

    ZeroMemory (& op, sizeof (op));
    op.lStructSize = sizeof (op);
    op.hwndOwner = hwndDlg;
    op.lpstrFile = szFile;
    op.nMaxFile = MAX_PATH;
    op.lpstrFilter = "All \ 0 *. * \ 0 text file (* .txt) \ 0 * .txt \ 0";
    op.nFilterIndex = 2;
    op.lpstrFileTitle = NULL;
    op.nMaxFileTitle = 0;
    op.lpstrInitialDir = NULL;
    op.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST | OFN_OVERWRITEPROMPT;

    if (OPEN == Flag)
    {
        if (GetOpenFileName (& op))
        {// Send the file path to the main dialog
            StrCpy (szFileTitle, szFile);
            PathStripPath (szFileTitle);
            SetWindowText (hwndDlg, szFileTitle);
            SendMessage (hwndDlg, WM_FILENAME, (WPARAM) szFile, (LPARAM) Flag);
        }
    }
    if (SAVE == Flag)
    {
        if (GetSaveFileName (& op))
        {
            SendMessage (hwndDlg, WM_FILENAME, (WPARAM) szFile, (LPARAM) Flag);
        }
    }
    return TRUE;
}

void ChooseFont (HWND hwndDlg, CHOOSEFONT & font, LOGFONT & log)
{
    TCHAR szStyle [256];
    HDC dc = GetDC (NULL);
    memset (szStyle, 0,256);
    WORD wFontType = 0;
    COLORREF color = RGB (0,0,0);
    ZeroMemory (& log, sizeof (log));

    ZeroMemory (& font, sizeof (font));
    font.lStructSize = sizeof (font);
    font.hwndOwner = hwndDlg;
    font.lpLogFont = & log;
    font.Flags = CF_EFFECTS | CF_FORCEFONTEXIST | CF_BOTH;
    font.rgbColors = color;
    font.lpszStyle = szStyle;
    font.hDC = dc;
    font.nFontType = wFontType;

}