Creating Dialogbased Windows Application (4) / 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：

 #include <Windows.h>
 #include <windowsx.h>
 #include <tchar.h>
 #include <Shobjidl.h>
 #include <mutex>
 #include <string>
 #include "Resource.h"

 // Sets the dialog box icons
 inline void chSETDLGICONS(HWND hWnd, int idi) {
     SendMessage(hWnd, WM_SETICON, ICON_BIG, (LPARAM)
         LoadIcon((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE),
             MAKEINTRESOURCE(idi)));
     SendMessage(hWnd, WM_SETICON, ICON_SMALL, (LPARAM)
         LoadIcon((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE),
             MAKEINTRESOURCE(idi)));
 }

 // The normal HANDLE_MSG macro in WindowsX.h does not work properly for dialog
 // boxes because DlgProc returns a BOOL instead of an LRESULT (like
 // WndProcs). This chHANDLE_DLGMSG macro corrects the problem:
 #define chHANDLE_DLGMSG(hWnd, message, fn)                 \
    case (message): return (SetDlgMsgResult(hWnd, uMsg,     \
       HANDLE_##message((hWnd), (wParam), (lParam), (fn))))

 // Main dialog
 HWND     g_hDlg;

 std::mutex g_add;
 // Adds a string to the "TextView" edit control
 // Disable "..." when "count == 0", otherwise
 // "count" can't be smaller than the (formatted) string size
 void AddText(DWORD count, PCTSTR pszFormat, ...) {
     std::lock_guard<std::mutex> lock(g_add);

     static std::string text;

     if (count == )
     {
         text.append(pszFormat);
     }
     else
     {
         va_list argList;
         va_start(argList, pszFormat);
         TCHAR *sz = new TCHAR[count];
         memset(sz, '\0', count);
         _vstprintf_s(sz, count, pszFormat, argList);
         va_end(argList);
         text.append(sz);
         delete[] sz;
     }

     HWND hEdit = GetDlgItem(g_hDlg, IDC_TEXTVIEW);
     ::SendMessage(hEdit,
         WM_SETREDRAW, FALSE/*关闭重绘*/, );

     //Edit_SetText(hEdit, text.c_str());
     //::SetDlgItemText(g_hDlg/*包含Edit Control主窗口的句柄*/,
     //IDC_TEXTVIEW/*Edit Control资源的编号*/, text.c_str()/*要输出的信息*/);
     ::SendMessage(hEdit, WM_SETTEXT, false, (LPARAM)text.c_str());

     int iLine = (int)::SendMessage(GetDlgItem(g_hDlg,
         IDC_TEXTVIEW)/*Edit Control的句柄*/, EM_GETLINECOUNT, /*忽略*/, /*忽略*/);
     ::SendMessage(hEdit, EM_LINESCROLL, /*水平滚动的字符个数*/,
         iLine/*垂直滚动的行数*/);
     size_t iOutputLen = _tcslen(pszFormat);
     ::SendMessage(hEdit, EM_SETSEL, iOutputLen/*要选中字符的起始位置*/,
         iOutputLen/*要选中字符的结束位置*/);

     ::SendMessage(hEdit, WM_SETREDRAW, TRUE/*打开重绘*/, );
 }

 INT_PTR WINAPI NewDlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
     switch (uMsg)
     {
     case WM_CLOSE:
         EndDialog(hWnd, );
         break;
     }

     return(FALSE);
 }

 void Dlg_OnCommand(HWND hWnd, int id, HWND hWndCtl, UINT codeNotify) {
     HRESULT hr;
     IFileDialog *pfd = NULL;
     LPWSTR filePath = L"";
     TCHAR file[MAX_PATH] = {  };
     COMDLG_FILTERSPEC rgSpec[] =
     {
         { TEXT(L"文本文档"), TEXT(L"*.txt") },
         { TEXT(L"所有文件"), TEXT(L"*.*") }
     };
     TCHAR* buffer;
     DWORD filesize;
     HWND hWndComboBox;
     static unsigned int num = ;
     switch (id) {
     case IDC_CHECKONTOP:
         SetWindowPos(hWnd, IsDlgButtonChecked(hWnd, IDC_CHECKONTOP)
             ? HWND_TOPMOST : HWND_NOTOPMOST, , , , , SWP_NOMOVE | SWP_NOSIZE);
         break;
     case IDC_BROWSE:
         hr = CoCreateInstance(CLSID_FileOpenDialog,
             NULL,
             CLSCTX_INPROC_SERVER,
             IID_PPV_ARGS(&pfd));
         FILEOPENDIALOGOPTIONS dwFlags;
         hr = pfd->GetOptions(&dwFlags);
         hr = pfd->SetOptions(dwFlags | FOS_FORCEFILESYSTEM);
         hr = pfd->SetFileTypes(, rgSpec);
         hr = pfd->SetFileTypeIndex();
         hr = pfd->Show(hWnd);
         IShellItem * pShellItem;
         hr = pfd->GetResult(&pShellItem);
         if (hr == S_OK)
         {
             hr = pShellItem->GetDisplayName(SIGDN_DESKTOPABSOLUTEPARSING, &filePath);
             WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, filePath, MAX_PATH, file,
                 sizeof(file), NULL, NULL);
             SetDlgItemText(hWnd, IDC_EDITCOMBO, file);
         }
         break;
     case IDOPEN:
         GetDlgItemText(hWnd, IDC_EDITCOMBO, file, _countof(file));
         hWndComboBox = GetDlgItem(hWnd, IDC_EDITCOMBO);
         SendMessage(hWndComboBox, CB_ADDSTRING, , (LPARAM)file);
         HANDLE hFile;
         DWORD readsize;
         hFile = CreateFile(file, GENERIC_READ, FILE_SHARE_READ, NULL,
             OPEN_EXISTING, NULL, NULL);
         if (hFile == INVALID_HANDLE_VALUE)
         {
             CloseHandle(hFile);
             break;
         }
         filesize = GetFileSize(hFile, NULL);
         buffer = new char[filesize + ];
         ReadFile(hFile, buffer, filesize, &readsize, NULL);
         buffer[filesize] = ;
         AddText(MAX_PATH + , _T("NO.%03d %s\r\n\r\n"), num, file);
         num++;
         AddText(, buffer);
         delete[] buffer;
         AddText(, "\r\n\r\n");
         CloseHandle(hFile);
         break;
     case IDCANCEL:
         SendMessage(hWnd, WM_CLOSE, , );
         break;

     }
 }

 BOOL Dlg_OnInitDialog(HWND hWnd, HWND hWndFocus, LPARAM lParam) {
     g_hDlg = hWnd;

     chSETDLGICONS(hWnd, IDI_ICON1);

     SetWindowPos(hWnd, HWND_TOPMOST, , , , , SWP_NOMOVE | SWP_NOSIZE);
     CheckDlgButton(hWnd, IDC_CHECKONTOP, BST_CHECKED);

     return(TRUE);
 }

 INT_PTR WINAPI Dlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
     switch (uMsg)
     {
         chHANDLE_DLGMSG(hWnd, WM_INITDIALOG, Dlg_OnInitDialog);
         chHANDLE_DLGMSG(hWnd, WM_COMMAND, Dlg_OnCommand);
     case WM_CLOSE:
         EndDialog(hWnd, );
         break;
     }

     return(FALSE);
 }

 int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {
     DialogBoxParam(hinstExe, MAKEINTRESOURCE(IDD_DIALOG),
         NULL, Dlg_Proc, _ttoi(pszCmdLine));

     return();
 }

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