API | MFC | C++ | C |
Programming Windows API

Combobox Control Example


//combo box demo

#include <windows.h> 

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); 

HINSTANCE g_hinst; 

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,PWSTR lpCmdLine, int nCmdShow)

{ 

HWND hwnd;

MSG msg ; 

WNDCLASS wc = {0};

wc.lpszClassName = TEXT("Application");

wc.hInstance = hInstance ;

wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);

wc.lpfnWndProc = WndProc ;

wc.hCursor = LoadCursor(0,IDC_ARROW);

g_hinst = hInstance;

RegisterClass(&wc);

hwnd = CreateWindow(wc.lpszClassName, TEXT("Combo Box"),WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 270, 170, 0, 0, hInstance, 0); 

while( GetMessage(&msg, NULL, 0, 0)) {

DispatchMessage(&msg);

} 

return (int) msg.wParam;

} 

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) 

{ 

static HWND hwndCombo, hwndStatic;

const TCHAR *items[] = { TEXT("Paris"), TEXT("London"), TEXT("Berlin"), TEXT("Rome") }; 

switch(msg) 

{

case WM_CREATE: 

//create combo box

hwndCombo = CreateWindow(TEXT("combobox"), NULL, WS_CHILD | WS_VISIBLE | CBS_DROPDOWN,10, 10, 120, 110, hwnd, NULL, g_hinst, NULL); 

//create static control

hwndStatic = CreateWindow(TEXT("static"), TEXT(""), WS_CHILD | WS_VISIBLE|WS_BORDER,150, 10, 90, 25, hwnd, NULL, g_hinst, NULL); 

int i; 

for (i = 0; i < 4; i++ ) 

{

//populate combo box

SendMessage(hwndCombo, CB_ADDSTRING, 0, (LPARAM) items[i]);

} 

break; 

case WM_COMMAND:

//respond to combo box selection

if ( HIWORD(wParam) == CBN_SELCHANGE) { 

TCHAR strText[255] = TEXT("\0");

//get position of selected item

LRESULT sel = SendMessage(hwndCombo, CB_GETCURSEL, 0, 0);

//get selected item text

 SendMessage(hwndCombo,CB_GETLBTEXT, sel,(LPARAM)strText);

//set value of static bex to value selected in combo box

SetWindowText(hwndStatic, strText);

SetFocus(hwnd);

} break;

case WM_DESTROY: 

PostQuitMessage(0);

break; 

}

return DefWindowProc(hwnd, msg, wParam, lParam);

}