我想使用Win API将一个组合框项目嵌入到我的GUI应用程序中。我需要组合框才能有图像，所以似乎ComboBoxEx就是这么做的。
但是，在使用此组合框时，如果选择了某个项目，则仅突出显示项目文本，而不是“完整行”。我想要的是类似于列表视图LVS_EX_FULLROWSELECT。
使用此控件可以吗？如果不是哪种控制最适合做这项工作？
编辑：这是我创建组合框的代码：
HWND combobox = CreateWindow(WC_COMBOBOXEX, TEXT(""), CBS_DROPDOWNLIST | WS_CHILD, 0, 0, 100, 300, parentHwnd, (HMENU)1234, GetModuleHandle(NULL), NULL);
HICON icon = LoadIcon(0, IDI_APPLICATION);
HIMAGELIST im_list = ImageList_Create(16, 16, 0, 1, 0);
ImageList_AddIcon(im_list, icon);
COMBOBOXEXITEM it;
it.pszText = L"Test";
it.mask = CBEIF_TEXT | CBEIF_IMAGE | CBEIF_SELECTEDIMAGE;
it.iItem = 0;
it.iIndent = 0;
it.iImage = 0;
it.iSelectedImage = 0;
SendMessage(combobox, CBEM_INSERTITEM, 0, reinterpret_cast<LPARAM>(&it));
SendMessage(combobox, CB_SETCURSEL, 0, 0);
SendMessage(combobox, CBEM_SETIMAGELIST, 0, (LPARAM)im_list);
不幸的是，这并没有表现出理想的行为。
答案 0 :(得分：0)
此工作代码可以满足您的要求，VS 2017，c ++。 您必须按照以下说明创建一些位图和对话框，然后就可以开始了。
// List image Icon Test.cpp : Defines the entry point for the application.
//
// READ ME:
// Create a new c++ desktop application
// Remove all the code from the cpp section and insert all this code.
// Create a dialog in VS editor, which has a list box called IDLIST and a combobox called IDCOMBO
// it will already have ok and cancel buttons these can stay.
// Create 4 bitmaps any size, only 24x24 will be shown and put them in the source project directory,
// eg C:\Users\Pts1\source\repos\List image Icon Test\List image Icon Test
// Rename the bitmaps Black.bmp, Blue.bmp, Red.bmp, Green.bmp and make sure they are of the format bmp not just called bmp.
// or ideally create the bitmaps so that they are 24x24 and all black,blue etc
// add IDB_Bread bitmap to the editor or remove them from the code below as instructed. We can load bitmaps directly from file instead.
//
#include "stdafx.h"
#include "List image Icon Test.h"
#include "strsafe.h"
#pragma comment(linker, "\"/manifestdependency:type='Win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
#define MAX_LOADSTRING 100
#define ID_BREAD 0
#define ID_DAIRY 1
#define ID_FRUIT 2
#define ID_MEAT 3
#define CX_BITMAP 24
#define CY_BITMAP 24
HBITMAP hbmBread, hbmDairy, hbmMeat, hbmFruit, hbmMask, hbmIcon;
HINSTANCE hInst; // current instance
WCHAR szTitle[MAX_LOADSTRING]; // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
void InitGroupList(HWND hDlg);
void DeleteIconBitmaps(void);
BOOL LoadIconBitmaps(void);
void InitFoodList(HWND hDlg);
INT_PTR CALLBACK FoodDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
// Initialize global strings
LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadStringW(hInstance, IDC_LISTIMAGEICONTEST, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow)) return FALSE;
HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_LISTIMAGEICONTEST));
MSG msg;
// Main message loop:
while (GetMessage(&msg, nullptr, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEXW wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_LISTIMAGEICONTEST));
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_LISTIMAGEICONTEST);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassExW(&wcex);
}
//
// FUNCTION: InitInstance(HINSTANCE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
//
// FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG1), hWnd, FoodDlgProc);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code that uses hdc here...
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Message handler for Square Meal dialog box. Click on Help -> ABout Box to activate this dialog.
// You must set the combo box properties to these for this to work.
//
// !!!!! The combo box you create for this example uses the CBS_DROPDOWNLIST, CBS_OWNERDRAWFIXED, (optional)CBS_SORT, CBS_HASSTRINGS, WS_VSCROLL, and (optional) WS_TABSTOP styles. !!!!!!
//
INT_PTR CALLBACK FoodDlgProc(HWND hDlg, UINT message, WPARAM wParam,LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
TCHAR achTemp[256];
HWND hwnd;
switch (message)
{
case WM_INITDIALOG:
// Call an application-defined function to load bitmap resources.
if (!LoadIconBitmaps())
{
Beep(2000, 250);
EndDialog(hDlg, -1);
break;
}
// Initialize the food groups combo box and select the first item.
InitGroupList(hDlg);
SendDlgItemMessage(hDlg, IDCOMBO, CB_SETCURSEL, 0, 0);
// Initialize the food list box and select the first item.
InitFoodList(hDlg);
SendDlgItemMessage(hDlg, IDLIST, LB_SETCURSEL, 0, 0);
return (INT_PTR)TRUE;
case WM_MEASUREITEM:
{
// Set the height of the items in the food groups combo box.
LPMEASUREITEMSTRUCT lpmis = (LPMEASUREITEMSTRUCT)lParam;
if (lpmis->itemHeight < CY_BITMAP + 2) lpmis->itemHeight = CY_BITMAP + 2;
}
break;
case WM_DRAWITEM:
{
COLORREF clrBackground;
COLORREF clrForeground;
TEXTMETRIC tm;
int x;
int y;
HRESULT hr;
size_t cch;
LPDRAWITEMSTRUCT lpdis = (LPDRAWITEMSTRUCT)lParam;
if (lpdis->itemID == -1) // Empty item)
break;
// Get the food icon from the item data.
hbmIcon = (HBITMAP)lpdis->itemData;
// The colors depend on whether the item is selected.
clrForeground = SetTextColor(lpdis->hDC,
GetSysColor(lpdis->itemState & ODS_SELECTED ?
COLOR_HIGHLIGHTTEXT : COLOR_WINDOWTEXT));
clrBackground = SetBkColor(lpdis->hDC,
GetSysColor(lpdis->itemState & ODS_SELECTED ?
COLOR_HIGHLIGHT : COLOR_WINDOW));
// Calculate the vertical and horizontal position.
GetTextMetrics(lpdis->hDC, &tm);
y = (lpdis->rcItem.bottom + lpdis->rcItem.top - tm.tmHeight) / 2;
x = LOWORD(GetDialogBaseUnits()) / 4;
// Get and display the text for the list item.
SendMessage(lpdis->hwndItem, CB_GETLBTEXT,
lpdis->itemID, (LPARAM)achTemp);
hr = StringCchLength(achTemp, 256, &cch);
if (FAILED(hr))
{
// TODO: Write error handler.
}
ExtTextOut(lpdis->hDC, CX_BITMAP + 2 * x, y,
ETO_CLIPPED | ETO_OPAQUE, &lpdis->rcItem,
achTemp, (UINT)cch, NULL);
// Restore the previous colors.
SetTextColor(lpdis->hDC, clrForeground);
SetBkColor(lpdis->hDC, clrBackground);
// Draw the food icon for the item.
HDC hdc = CreateCompatibleDC(lpdis->hDC);
if (hdc == NULL)
break;
SelectObject(hdc, hbmMask);
BitBlt(lpdis->hDC, x, lpdis->rcItem.top + 1,
CX_BITMAP, CY_BITMAP, hdc, 0, 0, SRCAND);
SelectObject(hdc, hbmIcon);
BitBlt(lpdis->hDC, x, lpdis->rcItem.top + 1,
CX_BITMAP, CY_BITMAP, hdc, 0, 0, SRCPAINT);
DeleteDC(hdc);
// If the item has the focus, draw the focus rectangle.
if (lpdis->itemState & ODS_FOCUS) DrawFocusRect(lpdis->hDC, &lpdis->rcItem);
}
break;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDCOMBO:
if (HIWORD(wParam) == CBN_SELENDOK)
{
InitFoodList(hDlg);
SendDlgItemMessage(hDlg, IDLIST,
LB_SETCURSEL, 0, 0);
}
break;
case IDLIST:
if (HIWORD(wParam) != LBN_DBLCLK)
break;
// For a double-click, process the OK case.
case IDOK:
// Get the text for the selected list item.
hwnd = GetDlgItem(hDlg, IDLIST);
// Here it is assumed the text can fit into achTemp.
// If there is doubt, call LB_GETTEXTLENGTH first.
SendMessage(hwnd, LB_GETTEXT,
SendMessage(hwnd, LB_GETCURSEL, 0, 0),
(LPARAM)achTemp);
// TODO: Do something with the selected text.
EndDialog(hDlg, 0);
break;
case IDCANCEL:
hwnd = GetDlgItem(hDlg, IDCOMBO);
if (SendMessage(hwnd, CB_GETDROPPEDSTATE, 0, 0))
SendMessage(hwnd, CB_SHOWDROPDOWN, FALSE, 0);
else EndDialog(hDlg, 0);
}
break;
case WM_DESTROY:
// Call the application-defined function to free the bitmap resources.
DeleteIconBitmaps();
break;
}
return (INT_PTR)FALSE;
}
// Loads string resources and adds them as items to the drop-down list of
// the food groups combo box. The bitmap handle of each item's icon is
// stored as item data for easy access when the item needs to be drawn.
//
void InitGroupList(HWND hDlg)
{
TCHAR achTemp[256];
DWORD dwIndex;
// Get the handle of the food groups combo box.
HWND hwndGroupsBox = GetDlgItem(hDlg, IDCOMBO);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
dwIndex = SendMessage(hwndGroupsBox, CB_ADDSTRING, 0, (LPARAM)achTemp);
SendMessage(hwndGroupsBox, CB_SETITEMDATA, dwIndex, (LPARAM)hbmBread);
LoadString(hInst, IDS_DAIRY, achTemp, sizeof(achTemp) / sizeof(TCHAR));
dwIndex = SendMessage(hwndGroupsBox, CB_ADDSTRING, 0, (LPARAM)achTemp);
SendMessage(hwndGroupsBox, CB_SETITEMDATA, dwIndex, (LPARAM)hbmDairy);
LoadString(hInst, IDS_FRUIT, achTemp, sizeof(achTemp) / sizeof(TCHAR));
dwIndex = SendMessage(hwndGroupsBox, CB_ADDSTRING, 0, (LPARAM)achTemp);
SendMessage(hwndGroupsBox, CB_SETITEMDATA, dwIndex, (LPARAM)hbmFruit);
LoadString(hInst, IDS_MEAT, achTemp, sizeof(achTemp) / sizeof(TCHAR));
dwIndex = SendMessage(hwndGroupsBox, CB_ADDSTRING, 0, (LPARAM)achTemp);
SendMessage(hwndGroupsBox, CB_SETITEMDATA, dwIndex, (LPARAM)hbmMeat);
return;
}
// Fills the food list based on the selected item in the food groups combo box.
void InitFoodList(HWND hDlg)
{
TCHAR achTemp[256];
HWND hwndGroupsBox = GetDlgItem(hDlg, IDCOMBO);
HWND hwndFoodList = GetDlgItem(hDlg, IDLIST);
// Clear the list contents.
SendMessage(hwndFoodList, LB_RESETCONTENT, 0, 0);
// Find out which food group is selected.
int idFoodGroup = SendMessage(hwndGroupsBox, CB_GETCURSEL, 0, 0);
switch (idFoodGroup)
{
case ID_BREAD:
LoadString(hInst, IDS_OATS, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_WHEAT, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_RYE, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
break;
case ID_DAIRY:
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
break;
case ID_FRUIT:
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
break;
case ID_MEAT:
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
LoadString(hInst, IDS_BREAD, achTemp, sizeof(achTemp) / sizeof(TCHAR));
SendMessage(hwndFoodList, LB_ADDSTRING, 0, (LPARAM)achTemp);
break;
default:
break;
}
return;
}
// Loads the food icon bitmaps from the application resources.
//
BOOL LoadIconBitmaps(void)
{
hbmBread = (HBITMAP)LoadImageW(hInst, (wchar_t*) L"Blue.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); //File has to be of format .bmp
if (hbmBread != NULL) hbmDairy = (HBITMAP)LoadImageW(hInst, (wchar_t*) L"Green.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); //File has to be of format .bmp
if (hbmDairy != NULL) hbmMeat = (HBITMAP)LoadImageW(hInst, (wchar_t*)L"Red.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); //File has to be of format .bmp
/*
// original code which still works, you need to put in bitmaps into the editor itself. eg IDB_Bread, IDB_DAIRY, are 48x48 bitmaps in my editor by default.
hbmBread = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BREAD));
if (hbmBread != NULL) hbmDairy = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_DAIRY));
if (hbmDairy != NULL) hbmMeat = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_Green));
*/
if (hbmMeat != NULL) hbmFruit = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BREAD)); //Bitmap defined in the editor(resource.h) which calls a Black.bmp file. See VS Bitmap editor.
if (hbmFruit != NULL) hbmMask = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BREAD));
if (hbmMask != NULL)
return TRUE;
return FALSE;
}
// Frees the icon bitmps.
//
void DeleteIconBitmaps(void)
{
FreeResource(reinterpret_cast<HGLOBAL>(hbmBread));
FreeResource(reinterpret_cast<HGLOBAL>(hbmDairy));
FreeResource(reinterpret_cast<HGLOBAL>(hbmMeat));
FreeResource(reinterpret_cast<HGLOBAL>(hbmFruit));
FreeResource(reinterpret_cast<HGLOBAL>(hbmMask));
}