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 == 0)
    {
        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*/, 0);

    //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, 0/*忽略*/, 0/*忽略*/);
    ::SendMessage(hEdit, EM_LINESCROLL, 0/*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*/, 0);
}

INT_PTR WINAPI NewDlg_Proc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
    switch (uMsg)
    {
    case WM_CLOSE:
        EndDialog(hWnd, 0);
        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] = { 0 };
    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 = 1;
    switch (id) {
    case IDC_CHECKONTOP:
        SetWindowPos(hWnd, IsDlgButtonChecked(hWnd, IDC_CHECKONTOP)
            ? HWND_TOPMOST : HWND_NOTOPMOST, 0, 0, 0, 0, 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(2, rgSpec);
        hr = pfd->SetFileTypeIndex(1);
        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, 0, (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 + 1];
        ReadFile(hFile, buffer, filesize, &readsize, NULL);
        buffer[filesize] = 0;
        AddText(MAX_PATH + 32, _T("NO.%03d %s\r\n\r\n"), num, file);
        num++;
        AddText(0, buffer);
        delete[] buffer;
        AddText(0, "\r\n\r\n");
        CloseHandle(hFile);
        break;
    case IDCANCEL:
        SendMessage(hWnd, WM_CLOSE, 0, 0);
        break;

    }
}

BOOL Dlg_OnInitDialog(HWND hWnd, HWND hWndFocus, LPARAM lParam) {
    g_hDlg = hWnd;
    
    chSETDLGICONS(hWnd, IDI_ICON1);

    SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, 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, 0);
        break;
    }

    return(FALSE);
}

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

    return(0);
}

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