用C语言编写的Windows简易记事本源代码

          #include <windows.h>  
    #include "sample.h"  
      
    static char g_szClassName[] = "MyWindowClass";  
    static HINSTANCE g_hInst = NULL;  
    #define IDC_MAIN_TEXT   1001  
      
    BOOL LoadFile(HWND hEdit, LPSTR pszFileName)  
    {  
       HANDLE hFile;  
       BOOL bSuccess = FALSE;  
      
      
       hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL,  
          OPEN_EXISTING, 0, 0);  
       if(hFile != INVALID_HANDLE_VALUE)  
       {  
          DWORD dwFileSize;  
          dwFileSize = GetFileSize(hFile, NULL);  
          if(dwFileSize != 0xFFFFFFFF)  
          {  
             LPSTR pszFileText;  
             pszFileText = (LPSTR)GlobalAlloc(GPTR, dwFileSize + 1);  
             if(pszFileText != NULL)  
             {  
                DWORD dwRead;  
                if(ReadFile(hFile, pszFileText, dwFileSize, &dwRead, NULL))  
                {  
                   pszFileText[dwFileSize] = 0;   
                   if(SetWindowText(hEdit, pszFileText))  
                      bSuccess = TRUE;   
                }  
                GlobalFree(pszFileText);  
             }  
          }  
          CloseHandle(hFile);  
       }  
       return bSuccess;  
    }  
      
      
    BOOL SaveFile(HWND hEdit, LPSTR pszFileName)  
    {  
       HANDLE hFile;  
       BOOL bSuccess = FALSE;  
       hFile = CreateFile(pszFileName, GENERIC_WRITE, 0, 0,  
          CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);  
       if(hFile != INVALID_HANDLE_VALUE)  
       {  
          DWORD dwTextLength;  
          dwTextLength = GetWindowTextLength(hEdit);  
          if(dwTextLength > 0)  
          {  
             LPSTR pszText;  
             pszText = (LPSTR)GlobalAlloc(GPTR, dwTextLength + 1);  
             if(pszText != NULL)  
             {  
                if(GetWindowText(hEdit, pszText, dwTextLength + 1))  
                {  
                   DWORD dwWritten;  
                   if(WriteFile(hFile, pszText, dwTextLength, &dwWritten, NULL))  
                      bSuccess = TRUE;  
                }  
                GlobalFree(pszText);  
             }  
          }  
          CloseHandle(hFile);  
       }  
       return bSuccess;  
    }  
      
      
    BOOL DoFileOpenSave(HWND hwnd, BOOL bSave)  
    {  
       OPENFILENAME ofn;  
       char szFileName[MAX_PATH];  
      
      
       ZeroMemory(&ofn, sizeof(ofn));  
       szFileName[0] = 0;  
      
      
       ofn.lStructSize = sizeof(ofn);  
       ofn.hwndOwner = hwnd;  
       ofn.lpstrFilter = "文本文件 (*.txt)\0*.txt\0所有文件 (*.*)\0*.*\0\0";  
       ofn.lpstrFile = szFileName;  
       ofn.nMaxFile = MAX_PATH;  
       ofn.lpstrDefExt = "txt";  
      
      
       if(bSave)  
       {  
          ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY |  
             OFN_OVERWRITEPROMPT;  
               
          if(GetSaveFileName(&ofn))  
          {  
             if(!SaveFile(GetDlgItem(hwnd, IDC_MAIN_TEXT), szFileName))  
             {  
                MessageBox(hwnd, "保存文件失败.", "错误信息",  
                   MB_OK | MB_ICONEXCLAMATION);  
                return FALSE;  
             }  
          }  
       }  
       else  
       {  
          ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY;  
          if(GetOpenFileName(&ofn))  
          {  
             if(!LoadFile(GetDlgItem(hwnd, IDC_MAIN_TEXT), szFileName))  
             {  
                MessageBox(hwnd, "打开文件失败.", "错误信息",  
                   MB_OK | MB_ICONEXCLAMATION);  
                return FALSE;  
             }  
          }  
       }  
       return TRUE;  
    }  
      
      
    LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)  
    {  
       switch(Message)  
       {  
          case WM_CREATE:  
             CreateWindow("EDIT", "",  
                WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL | ES_MULTILINE |  
                   ES_WANTRETURN,  
                CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,  
                hwnd, (HMENU)IDC_MAIN_TEXT, g_hInst, NULL);  
      
      
             SendDlgItemMessage(hwnd, IDC_MAIN_TEXT, WM_SETFONT,  
                (WPARAM)GetStockObject(DEFAULT_GUI_FONT), MAKELPARAM(TRUE, 0));  
          break;  
          case WM_SIZE:  
             if(wParam != SIZE_MINIMIZED)  
                MoveWindow(GetDlgItem(hwnd, IDC_MAIN_TEXT), 0, 0, LOWORD(lParam),  
                   HIWORD(lParam), TRUE);  
          break;  
          case WM_SETFOCUS:  
             SetFocus(GetDlgItem(hwnd, IDC_MAIN_TEXT));  
          break;  
          case WM_COMMAND:  
             switch(LOWORD(wParam))  
             {  
                case CM_FILE_OPEN:  
                   DoFileOpenSave(hwnd, FALSE);  
                break;  
                case CM_FILE_SAVEAS:  
                   DoFileOpenSave(hwnd, TRUE);  
                break;  
                case CM_FILE_EXIT:  
                   PostMessage(hwnd, WM_CLOSE, 0, 0);  
                break;  
                case CM_ABOUT:  
                   MessageBox (NULL, "一个Windows C 记事本程序" , "关于...", 0);  
             }  
          break;  
          case WM_CLOSE:  
             DestroyWindow(hwnd);  
          break;  
          case WM_DESTROY:  
             PostQuitMessage(0);  
          break;  
          default:  
             return DefWindowProc(hwnd, Message, wParam, lParam);  
       }  
       return 0;  
    }  
      
      
    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,  
       LPSTR lpCmdLine, int nCmdShow)  
    {  
       WNDCLASSEX WndClass;  
       HWND hwnd;  
       MSG Msg;  
      
       g_hInst = hInstance;  
      
       WndClass.cbSize        = sizeof(WNDCLASSEX);  
       WndClass.style         = 0;  
       WndClass.lpfnWndProc   = WndProc;  
       WndClass.cbClsExtra    = 0;  
       WndClass.cbWndExtra    = 0;  
       WndClass.hInstance     = g_hInst;  
       WndClass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);  
       WndClass.hCursor       = LoadCursor(NULL, IDC_ARROW);  
       WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);  
       WndClass.lpszMenuName  = "MAINMENU";  
       WndClass.lpszClassName = g_szClassName;  
       WndClass.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);  
      
      
       if(!RegisterClassEx(&WndClass))  
       {  
          MessageBox(0, "注册窗口失败", "错误信息",  
             MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);  
          return 0;  
       }  
      
       hwnd = CreateWindowEx(  
          WS_EX_CLIENTEDGE,  
          g_szClassName,  
          "一个记事本程序",  
          WS_OVERLAPPEDWINDOW,  
          CW_USEDEFAULT, CW_USEDEFAULT, 800, 600,  
          NULL, NULL, g_hInst, NULL);  
      
      
       if(hwnd == NULL)  
       {  
          MessageBox(0, "创建窗口失败", "错误信息",  
             MB_ICONEXCLAMATION | MB_OK | MB_SYSTEMMODAL);  
          return 0;  
       }  
      
      
       ShowWindow(hwnd, nCmdShow);  
       UpdateWindow(hwnd);  
      
      
       while(GetMessage(&Msg, NULL, 0, 0))  
       {  
          TranslateMessage(&Msg);  
          DispatchMessage(&Msg);  
       }  
       return Msg.wParam;  
    }