Creating Dialogbased Win32 Application (4) / 創建基於對話框的Win32應用程式（四）Edit Control的應用、Unicode轉ANSI、自動滾動 / Win32, VC++, Windows

創建基於對話框的Win32應用程式（四）——Edit Control的應用、Unicode轉ANSI、自動滾動

　　之前的介紹中，我們用到了Button、Static Text、Checkbox這三個控制項。這一節中我們將學習使用Edit Control（編輯框）控制項，其中還包括Unicode轉ANSI的方法、文本框自動滾動的功能等。

24、首先切換到Reasource View（Ctrl+Shift+E），找到待修改的主窗體，並從Toolbox（Ctrl+Atl+X）中添加Edit Control控制項以及Button控制項如下：

其中較大的Edit Box的Properties設置為：

較小的Edit Box的Properties可以保持預設設置。

更改控制項ID後記得在reasource.h文件中將多餘的定義刪除或註釋掉：

註意：在以代碼形式打開reasource.h或.rc文件後若要回到Reasource View中查看編輯，須先將打開的各相關文件關閉。

25、在被調用的命令消息響應函數（Dlg_OnCommand）中添加對新增控制項的響應操作。

點擊Browse按鈕創建Open File Dialog，並將選取的文件路徑顯示在一旁的編輯框中：

其中WideCharToMultiByte函數實現了Unicode到ANSI的轉換。

在Edit Control中添加文本並實現自動滾動：

按下Open按鈕，根據較小編輯框中的路徑讀取文件，並按ANSI文本格式顯示在較大編輯框中：

  1 #include <Windows.h>
  2 #include <windowsx.h>
  3 #include <tchar.h>
  4 #include <Shobjidl.h>
  5 #include <mutex>
  6 #include "Resource.h"
  7 
  8 // Sets the dialog box icons
  9 inline void chSETDLGICONS(HWND hWnd, int idi) {
 10     SendMessage(hWnd, WM_SETICON, ICON_BIG, (LPARAM)
 11         LoadIcon((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE),
 12             MAKEINTRESOURCE(idi)));
 13     SendMessage(hWnd, WM_SETICON, ICON_SMALL, (LPARAM)
 14         LoadIcon((HINSTANCE)GetWindowLongPtr(hWnd, GWLP_HINSTANCE),
 15             MAKEINTRESOURCE(idi)));
 16 }
 17 
 18 // The normal HANDLE_MSG macro in WindowsX.h does not work properly for dialog
 19 // boxes because DlgProc returns a BOOL instead of an LRESULT (like
 20 // WndProcs). This chHANDLE_DLGMSG macro corrects the problem:
 21 #define chHANDLE_DLGMSG(hWnd, message, fn)                 \
 22    case (message): return (SetDlgMsgResult(hWnd, uMsg,     \
 23       HANDLE_##message((hWnd), (wParam), (lParam), (fn))))
 24 
 25 
 26 // Main dialog
 27 HWND     g_hDlg;
 28 
 29 std::mutex g_add;
 30 // Adds a string to the "TextView" edit control
 31 void AddText(PCTSTR pszFormat, ...) {
 32     std::lock_guard<std::mutex> lock(g_add);
 33 
 34     va_list argList;
 35     va_start(argList, pszFormat);
 36 
 37     static TCHAR sz[10 * 1024];
 38 
 39     Edit_GetText(GetDlgItem(g_hDlg, IDC_TEXTVIEW), sz, _countof(sz));
 40     _vstprintf_s(
 41         _tcschr(sz, TEXT('\0')), _countof(sz) - _tcslen(sz),
 42         pszFormat, argList);
 43     Edit_SetText(GetDlgItem(g_hDlg, IDC_TEXTVIEW), sz);
 44     va_end(argList);
 45 
 46     ::SendMessage(GetDlgItem(g_hDlg, IDC_TEXTVIEW), 
 47         WM_SETREDRAW, FALSE/*關閉重繪*/, 0);
 48 
 49     //::SetDlgItemText(g_hDlg/*包含Edit Control主視窗的句柄*/, 
 50     //IDC_TEXTVIEW/*Edit Control資源的編號*/, pszFormat/*要輸出的信息*/);
 51 
 52     int iLine = (int)::SendMessage(GetDlgItem(g_hDlg, 
 53         IDC_TEXTVIEW)/*Edit Control的句柄*/, EM_GETLINECOUNT, 0/*忽略*/, 0/*忽略*/);
 54     ::SendMessage(GetDlgItem(g_hDlg, IDC_TEXTVIEW), 
 55         EM_LINESCROLL, 0/*水平滾動的字元個數*/, iLine/*垂直滾動的行數*/);
 56 
 57     size_t iOutputLen = _tcslen(pszFormat);
 58     ::SendMessage(GetDlgItem(g_hDlg, IDC_TEXTVIEW), EM_SETSEL, 
 59         iOutputLen/*要選中字元的起始位置*/, iOutputLen/*要選中字元的結束位置*/);
 60 
 61     ::SendMessage(GetDlgItem(g_hDlg, IDC_TEXTVIEW), 
 62         WM_SETREDRAW, TRUE/*打開重繪*/, 0);
 63 }
 64 
 65 INT_PTR WINAPI NewDlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
 66     switch (uMsg)
 67     {
 68     case WM_CLOSE:
 69         EndDialog(hWnd, 0);
 70         break;
 71     }
 72 
 73     return(FALSE);
 74 }
 75 
 76 void Dlg_OnCommand(HWND hWnd, int id, HWND hWndCtl, UINT codeNotify) {
 77     HRESULT hr;
 78     IFileDialog *pfd = NULL;
 79     LPWSTR filePath = L"";
 80     TCHAR file[MAX_PATH] = { 0 };
 81     COMDLG_FILTERSPEC rgSpec[] =
 82     {
 83         { TEXT(L"文本文檔"), TEXT(L"*.txt") },
 84         { TEXT(L"所有文件"), TEXT(L"*.*") }
 85     };
 86 
 87     TCHAR buffer[10240] = { 0 };
 88     switch (id) {
 89     case IDC_CHECKONTOP:
 90         SetWindowPos(hWnd, IsDlgButtonChecked(hWnd, IDC_CHECKONTOP)
 91             ? HWND_TOPMOST : HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
 92         break;
 93     case IDC_BROWSE:
 94         hr = CoCreateInstance(CLSID_FileOpenDialog,
 95             NULL,
 96             CLSCTX_INPROC_SERVER,
 97             IID_PPV_ARGS(&pfd));
 98         FILEOPENDIALOGOPTIONS dwFlags;
 99         hr = pfd->GetOptions(&dwFlags);
100         hr = pfd->SetOptions(dwFlags | FOS_FORCEFILESYSTEM);
101         typedef struct _COMDLG_FILTERSPEC {
102             LPCWSTR pszName;
103             LPCWSTR pszSpec;
104         } COMDLG_FILTERSPEC;
105         hr = pfd->SetFileTypes(2, rgSpec);
106         hr = pfd->SetFileTypeIndex(1);
107         hr = pfd->Show(hWnd);
108         IShellItem * pShellItem;
109         hr = pfd->GetResult(&pShellItem);
110         if (hr == S_OK)
111         {
112             hr = pShellItem->GetDisplayName(SIGDN_DESKTOPABSOLUTEPARSING, &filePath);
113             WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, filePath, MAX_PATH, file, 
114                 sizeof(file), NULL, NULL);
115             SetDlgItemText(hWnd, IDC_OPENEDIT, file);
116         }
117         break;
118     case IDOPEN:
119         GetDlgItemText(hWnd, IDC_OPENEDIT, file, _countof(file));
120         HANDLE hFile;
121         DWORD readsize;
122         hFile = CreateFile(file, GENERIC_READ, FILE_SHARE_READ, NULL, 
123             OPEN_EXISTING, NULL, NULL);
124         ReadFile(hFile, buffer, sizeof(buffer), &readsize, NULL);
125         AddText(buffer);
126         CloseHandle(hFile);
127         break;
128     case IDCANCEL:
129         SendMessage(hWnd, WM_CLOSE, 0, 0);
130         break;
131 
132     }
133 }
134 
135 BOOL Dlg_OnInitDialog(HWND hWnd, HWND hWndFocus, LPARAM lParam) {
136     g_hDlg = hWnd;
137 
138     chSETDLGICONS(hWnd, IDI_ICON1);
139 
140     SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
141     CheckDlgButton(hWnd, IDC_CHECKONTOP, BST_CHECKED);
142 
143     return(TRUE);
144 }
145 
146 INT_PTR WINAPI Dlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
147     switch (uMsg)
148     {
149         chHANDLE_DLGMSG(hWnd, WM_INITDIALOG, Dlg_OnInitDialog);
150         chHANDLE_DLGMSG(hWnd, WM_COMMAND, Dlg_OnCommand);
151     case WM_CLOSE:
152         EndDialog(hWnd, 0);
153         break;
154     }
155 
156     return(FALSE);
157 }
158 
159 int WINAPI WinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {
160     DialogBoxParam(hinstExe, MAKEINTRESOURCE(IDD_DIALOG),
161         NULL, Dlg_Proc, _ttoi(pszCmdLine));
162 
163     return(0);
164 }

26、此時按下F5 Start Debugging，可以檢驗所需功能皆已完成。

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本文為本人原創，轉載請註明出處。