win32-combobox

doc

// WinComboBox.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "stdio.h"
#include "resource.h"

HINSTANCE g_hInst = NULL;

void OnCreate( HWND hWnd, UINT nMsg,
              WPARAM wParam, LPARAM lParam )
{    //简单组合框的创建
    CreateWindow( "COMBOBOX", "SIMPLE",
        WS_CHILD|WS_VISIBLE|CBS_SIMPLE,
        50, 50, 120, 300, hWnd, 
        (HMENU)1001, g_hInst, NULL );
    //下拉式组合框的创建
    CreateWindow( "COMBOBOX", "DROPDOWN",
        WS_CHILD|WS_VISIBLE|WS_VSCROLL|CBS_DROPDOWN,
        200, 50, 120, 300, hWnd,
        (HMENU)1002, g_hInst, NULL );
    //下拉列表式组合框的创建
    CreateWindow( "COMBOBOX", "DROPDOWNLIST",
        WS_CHILD|WS_VISIBLE|WS_VSCROLL|CBS_DROPDOWNLIST,
        350, 50, 120, 100, hWnd,
        (HMENU)1003, g_hInst, NULL );
}

void OnAdd( HWND hWnd )
{    //获取COMBOBOX窗口句柄
    HWND hSimple   = GetDlgItem( hWnd, 1001 );
    HWND hDropDown = GetDlgItem( hWnd, 1002 );
    HWND hDropList = GetDlgItem( hWnd, 1003 );
    //添加多个选项
    CHAR szText[] = "ComboBox 0";
    for( int nIndex=0; nIndex<10; nIndex++ )
    {    //添加选项
        LRESULT nItem = SendMessage( hSimple, 
            CB_ADDSTRING, 0, (LPARAM)szText );
        //设置项的数据
        SendMessage( hSimple, CB_SETITEMDATA,
            nItem, 100+nIndex );

        SendMessage( hDropDown, CB_ADDSTRING, 
            0, (LPARAM)szText );
        SendMessage( hDropList, CB_ADDSTRING, 
            0, (LPARAM)szText );
        //改变选项内容
        szText[9]++;
    }
}

void OnDel( HWND hWnd )
{    //获取COMBOBOX窗口句柄
    HWND hSimple   = GetDlgItem( hWnd, 1001 );
    HWND hDropDown = GetDlgItem( hWnd, 1002 );
    HWND hDropList = GetDlgItem( hWnd, 1003 );
    //删除指定项
    SendMessage( hSimple, 
        CB_DELETESTRING, 5, 0 );
    SendMessage( hDropDown, 
        CB_DELETESTRING, 5, 0 );
    SendMessage( hDropList, 
        CB_DELETESTRING, 5, 0 );
}

void OnReset( HWND hWnd )
{    //获取COMBOBOX窗口句柄
    HWND hSimple   = GetDlgItem( hWnd, 1001 );
    HWND hDropDown = GetDlgItem( hWnd, 1002 );
    HWND hDropList = GetDlgItem( hWnd, 1003 );
    //清空所有项
    SendMessage( hSimple,   CB_RESETCONTENT, 0, 0 );
    SendMessage( hDropDown, CB_RESETCONTENT, 0, 0 );
    SendMessage( hDropList, CB_RESETCONTENT, 0, 0 );
}

void OnSelect( HWND hWnd )
{    //获取COMBOBOX窗口句柄
    HWND hSimple   = GetDlgItem( hWnd, 1001 );
    HWND hDropDown = GetDlgItem( hWnd, 1002 );
    HWND hDropList = GetDlgItem( hWnd, 1003 );
    //获取和设置选择项
    LRESULT nSel = 
        SendMessage( hSimple, CB_GETCURSEL, 0, 0 );
    //获取数据
    LRESULT nValue = SendMessage( hSimple, 
        CB_GETITEMDATA, nSel, 0 );
    CHAR szInfo[260] = { 0 };
    sprintf( szInfo, "%d", nValue );
    MessageBox( NULL, szInfo, "WinCombo", MB_OK );
    
    //设置选择项
    SendMessage( hDropDown, CB_SETCURSEL, nSel, 0 );
    CHAR szText[] = "ComboBox 5";
    SendMessage( hDropList, CB_SELECTSTRING, 
        -1, (LPARAM)szText );
}

void OnFind( HWND hWnd )
{    //获取COMBOBOX窗口句柄
    HWND hSimple   = GetDlgItem( hWnd, 1001 );
    HWND hDropDown = GetDlgItem( hWnd, 1002 );
    HWND hDropList = GetDlgItem( hWnd, 1003 );
    //查找字符串
    CHAR szText[] = "ComboBox 5";
    LRESULT nFind1 = SendMessage( hSimple, 
        CB_FINDSTRING, -1, (LPARAM)szText );
    SendMessage( hDropDown, CB_SETCURSEL,
       nFind1, 0 );
    SendMessage( hDropList, CB_SETCURSEL,
       nFind1, 0 );
}

void OnPath( HWND hWnd )
{    //获取COMBOBOX窗口句柄
    HWND hSimple   = GetDlgItem( hWnd, 1001 );
    HWND hDropDown = GetDlgItem( hWnd, 1002 );
    HWND hDropList = GetDlgItem( hWnd, 1003 );
    //显示目录
    CHAR szPath[MAX_PATH] = "C:\\*.*";
    SendMessage( hSimple, CB_DIR,
        DDL_DIRECTORY|DDL_ARCHIVE,
        (LPARAM)szPath );
    SendMessage( hDropDown, CB_DIR,
        DDL_DIRECTORY|DDL_ARCHIVE,
        (LPARAM)szPath );
    SendMessage( hDropList, CB_DIR,
        DDL_DIRECTORY|DDL_ARCHIVE,
        (LPARAM)szPath );
}

void OnCommand( HWND hWnd, UINT nMsg,
        WPARAM wParam, LPARAM lParam )
{
    int nNotifyCode = HIWORD( wParam );
    int nEventID = LOWORD( wParam );
    switch( nEventID )
    {
    case ID_ADD:
        OnAdd( hWnd );
        break;
    case ID_DEL:
        OnDel( hWnd );
        break;
    case ID_RESET:
        OnReset( hWnd );
        break;
    case ID_SEL:
        OnSelect( hWnd );
        break;
    case ID_FIND:
        OnFind( hWnd );
        break;
    case ID_PATH:
        OnPath( hWnd );
        break;
    case 1001:
        {
            HWND hSimple   = GetDlgItem( hWnd, 1001 );
            HWND hDropDown = GetDlgItem( hWnd, 1002 );
            HWND hDropList = GetDlgItem( hWnd, 1003 );
            LRESULT nSel   = 0;
            switch( nNotifyCode )
            {
            case CBN_SELCHANGE:
                nSel = SendMessage( hSimple, 
                    CB_GETCURSEL, 0, 0 );
                SendMessage( hDropDown, 
                    CB_SETCURSEL, nSel, 0 );
                SendMessage( hDropList, 
                    CB_SETCURSEL, nSel, 0 );

                //MessageBox( NULL, "CBN_SELCHANGE",
                //    "WinCombo", MB_OK );

                break;
            }
        }
        break;
    }
}

LRESULT CALLBACK WndProc( HWND   hWnd, 
                          UINT   nMsg,
                          WPARAM wParam,
                          LPARAM lParam )
{
    switch( nMsg )
    {
    case WM_CREATE:
        OnCreate( hWnd, nMsg, wParam, lParam );
        break;
    case WM_COMMAND:
        OnCommand( hWnd, nMsg, wParam, lParam );
        break;
    case WM_DESTROY:
        PostQuitMessage( 0 );
        return 0;
    }
    return DefWindowProc( hWnd, nMsg,
        wParam, lParam );
}

BOOL RegisterWnd( LPSTR pszClassName )
{
    WNDCLASSEX wce = { 0 };
    wce.cbSize        = sizeof( wce );
    wce.cbClsExtra    = 0;
    wce.cbWndExtra    = 0;
    wce.hbrBackground = HBRUSH(COLOR_BTNFACE+1);
    wce.hCursor       = NULL;
    wce.hIcon         = NULL;
    wce.hIconSm       = NULL;
    wce.hInstance     = g_hInst;
    wce.lpfnWndProc   = WndProc;
    wce.lpszClassName = pszClassName;
    wce.lpszMenuName  = NULL;
    wce.style         = CS_HREDRAW|CS_VREDRAW;

    ATOM nAtom = RegisterClassEx( &wce );
    if( 0 ==  nAtom )
    {
        return FALSE;
    }

    return TRUE;
}

HWND CreateWnd( LPSTR pszClassName )
{
    HMENU hMenu = LoadMenu( g_hInst,
        MAKEINTRESOURCE(IDR_MAIN) );
    HWND hWnd = CreateWindowEx( 0,
        pszClassName, "MyWnd", 
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT,
        CW_USEDEFAULT, CW_USEDEFAULT,
        CW_USEDEFAULT, NULL, hMenu, g_hInst,
        NULL );
    return hWnd;
}

void DisplayWnd( HWND hWnd )
{
    ShowWindow( hWnd, SW_SHOW );
    UpdateWindow( hWnd );
}

void Message( )
{
    MSG msg = { 0 };
    while( GetMessage( &msg, NULL, 0, 0 ) )
    {
        TranslateMessage( &msg );
        DispatchMessage( &msg );
    }
}

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    g_hInst = hInstance;
    RegisterWnd( "MYWND" );
    HWND hWnd = CreateWnd( "MYWND" );
    DisplayWnd( hWnd );
    Message( );
    return 0;
}