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[操作系统]Creating Dialogbased Windows Application / 创建基于对话框的Windows应用程序(四)Edit Control、Combo Box的应用、Unicode转ANSI、Open File Dialog、文件读取、可变参数、文本框自动滚动 / VC++, Windows


创建基于对话框的Windows应用程序(四)—— Edit Control、Combo Box的应用、Unicode转ANSI、Open File Dialog、文件读取、可变参数、自动滚动

  

  之前的介绍中,我们用到了Button、Static Text、Checkbox这三个控件。这一节中我们将学习使用Edit Control(编辑框)、Combo Box控件,其中还包括Unicode转ANSI的方法、创建Open File Dialog、 读取文件、可变参数(这里用于生成日志)、文本框自动滚动的功能等。 

24、首先切换到Reasource View(Ctrl+Shift+E),找到待修改的主窗体,并从Toolbox(Ctrl+Atl+X)中添加Edit Control、Combo Box、Button控件如下:

 

其中Edit Box的Properties设置为:

 

点击Combo Box右边三角箭头可以调整其下拉框的大小:

 

更改控件ID后记得在reasource.h文件中将多余的定义删除或注释掉:

 

注意:在以代码形式打开reasource.h或.rc文件后若要回到Reasource View中查看编辑,须先将打开的各相关文件关闭。

25、在被调用的命令消息响应函数(Dlg_OnCommand)中添加对Browse按钮的响应动作。

点击Browse按钮将创建Open File Dialog,并将选取的文件路径显示在一旁的Combo Box中:

 

其中WideCharToMultiByte函数实现了Unicode到ANSI的转换。

26、实现在Edit Control中添加文本并实现自动滚动:

 

其中当“count == 0”时,将屏蔽可变参数的使用。关于可变参数的使用可以在后面的代码中看到。

按下Open按钮,将根据Combo Box中的路径读取文件,并按ANSI文本格式显示在Edit Control中:

 

 1 #include <Windows.h> 2 #include <windowsx.h> 3 #include <tchar.h> 4 #include <Shobjidl.h> 5 #include <mutex> 6 #include <string> 7 #include "Resource.h" 8  9 // Sets the dialog box icons 10 inline void chSETDLGICONS(HWND hWnd, int idi) { 11   SendMessage(hWnd, WM_SETICON, ICON_BIG, (LPARAM) 12     LoadIcon((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE), 13       MAKEINTRESOURCE(idi))); 14   SendMessage(hWnd, WM_SETICON, ICON_SMALL, (LPARAM) 15     LoadIcon((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE), 16       MAKEINTRESOURCE(idi))); 17 } 18  19 // The normal HANDLE_MSG macro in WindowsX.h does not work properly for dialog 20 // boxes because DlgProc returns a BOOL instead of an LRESULT (like 21 // WndProcs). This chHANDLE_DLGMSG macro corrects the problem: 22 #define chHANDLE_DLGMSG(hWnd, message, fn)         \ 23  case (message): return (SetDlgMsgResult(hWnd, uMsg,   \ 24    HANDLE_##message((hWnd), (wParam), (lParam), (fn)))) 25  26 // Main dialog 27 HWND   g_hDlg; 28  29 std::mutex g_add; 30 // Adds a string to the "TextView" edit control 31 // Disable "..." when "count == 0", otherwise 32 // "count" can't be smaller than the (formatted) string size 33 void AddText(DWORD count, PCTSTR pszFormat, ...) { 34   std::lock_guard<std::mutex> lock(g_add); 35  36   static std::string text; 37  38   if (count == 0) 39   { 40     text.append(pszFormat); 41   } 42   else 43   { 44     va_list argList; 45     va_start(argList, pszFormat); 46     TCHAR *sz = new TCHAR[count]; 47     memset(sz, '\0', count); 48     _vstprintf_s(sz, count, pszFormat, argList); 49     va_end(argList); 50     text.append(sz); 51     delete[] sz; 52   } 53  54   HWND hEdit = GetDlgItem(g_hDlg, IDC_TEXTVIEW); 55   ::SendMessage(hEdit, 56     WM_SETREDRAW, FALSE/*关闭重绘*/, 0); 57  58   //Edit_SetText(hEdit, text.c_str()); 59   //::SetDlgItemText(g_hDlg/*包含Edit Control主窗口的句柄*/,  60   //IDC_TEXTVIEW/*Edit Control资源的编号*/, text.c_str()/*要输出的信息*/); 61   ::SendMessage(hEdit, WM_SETTEXT, false, (LPARAM)text.c_str()); 62  63   int iLine = (int)::SendMessage(GetDlgItem(g_hDlg,  64     IDC_TEXTVIEW)/*Edit Control的句柄*/, EM_GETLINECOUNT, 0/*忽略*/, 0/*忽略*/); 65   ::SendMessage(hEdit, EM_LINESCROLL, 0/*水平滚动的字符个数*/,  66     iLine/*垂直滚动的行数*/); 67   size_t iOutputLen = _tcslen(pszFormat); 68   ::SendMessage(hEdit, EM_SETSEL, iOutputLen/*要选中字符的起始位置*/,  69     iOutputLen/*要选中字符的结束位置*/); 70  71   ::SendMessage(hEdit, WM_SETREDRAW, TRUE/*打开重绘*/, 0); 72 } 73  74 INT_PTR WINAPI NewDlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { 75   switch (uMsg) 76   { 77   case WM_CLOSE: 78     EndDialog(hWnd, 0); 79     break; 80   } 81  82   return(FALSE); 83 } 84  85 void Dlg_OnCommand(HWND hWnd, int id, HWND hWndCtl, UINT codeNotify) { 86   HRESULT hr; 87   IFileDialog *pfd = NULL; 88   LPWSTR filePath = L""; 89   TCHAR file[MAX_PATH] = { 0 }; 90   COMDLG_FILTERSPEC rgSpec[] = 91   { 92     { TEXT(L"文本文档"), TEXT(L"*.txt") }, 93     { TEXT(L"所有文件"), TEXT(L"*.*") } 94   }; 95   TCHAR* buffer; 96   DWORD filesize; 97   HWND hWndComboBox; 98   static unsigned int num = 1; 99   switch (id) {100   case IDC_CHECKONTOP:101     SetWindowPos(hWnd, IsDlgButtonChecked(hWnd, IDC_CHECKONTOP)102       ? HWND_TOPMOST : HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);103     break;104   case IDC_BROWSE:105     hr = CoCreateInstance(CLSID_FileOpenDialog,106       NULL,107       CLSCTX_INPROC_SERVER,108       IID_PPV_ARGS(&pfd));109     FILEOPENDIALOGOPTIONS dwFlags;110     hr = pfd->GetOptions(&dwFlags);111     hr = pfd->SetOptions(dwFlags | FOS_FORCEFILESYSTEM);112     hr = pfd->SetFileTypes(2, rgSpec);113     hr = pfd->SetFileTypeIndex(1);114     hr = pfd->Show(hWnd);115     IShellItem * pShellItem;116     hr = pfd->GetResult(&pShellItem);117     if (hr == S_OK)118     {119       hr = pShellItem->GetDisplayName(SIGDN_DESKTOPABSOLUTEPARSING, &filePath);120       WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, filePath, MAX_PATH, file, 121         sizeof(file), NULL, NULL);122       SetDlgItemText(hWnd, IDC_EDITCOMBO, file);123     }124     break;125   case IDOPEN:126     GetDlgItemText(hWnd, IDC_EDITCOMBO, file, _countof(file));127     hWndComboBox = GetDlgItem(hWnd, IDC_EDITCOMBO);128     SendMessage(hWndComboBox, CB_ADDSTRING, 0, (LPARAM)file);129     HANDLE hFile;130     DWORD readsize;131     hFile = CreateFile(file, GENERIC_READ, FILE_SHARE_READ, NULL, 132       OPEN_EXISTING, NULL, NULL);133     if (hFile == INVALID_HANDLE_VALUE)134     {135       CloseHandle(hFile);136       break;137     }138     filesize = GetFileSize(hFile, NULL);139     buffer = new char[filesize + 1];140     ReadFile(hFile, buffer, filesize, &readsize, NULL);141     buffer[filesize] = 0;142     AddText(MAX_PATH + 32, _T("NO.%03d %s\r\n\r\n"), num, file);143     num++;144     AddText(0, buffer);145     delete[] buffer;146     AddText(0, "\r\n\r\n");147     CloseHandle(hFile);148     break;149   case IDCANCEL:150     SendMessage(hWnd, WM_CLOSE, 0, 0);151     break;152 153   }154 }155 156 BOOL Dlg_OnInitDialog(HWND hWnd, HWND hWndFocus, LPARAM lParam) {157   g_hDlg = hWnd;158   159   chSETDLGICONS(hWnd, IDI_ICON1);160 161   SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);162   CheckDlgButton(hWnd, IDC_CHECKONTOP, BST_CHECKED);163 164   return(TRUE);165 }166 167 INT_PTR WINAPI Dlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {168   switch (uMsg)169   {170     chHANDLE_DLGMSG(hWnd, WM_INITDIALOG, Dlg_OnInitDialog);171     chHANDLE_DLGMSG(hWnd, WM_COMMAND, Dlg_OnCommand);172   case WM_CLOSE:173     EndDialog(hWnd, 0);174     break;175   }176 177   return(FALSE);178 }179 180 int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {181   DialogBoxParam(hinstExe, MAKEINTRESOURCE(IDD_DIALOG),182     NULL, Dlg_Proc, _ttoi(pszCmdLine));183 184   return(0);185 }

Win32WindowsApplication.cpp

26、此时按下F5 Start Debugging,可以检验所需功能皆已完成。

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http://www.cnblogs.com/lantingji/p/5886181.html