TrackBar

Visual C++ 2005 Express Edition
Windows Server 2003 SP1 Platform SDK
Windowsアプリケーション / 空のプロジェクト

// マルチバイト文字セット

#include <stdio.h>
#include <windows.h>
#include <commctrl.h>

#define APPNAME	"TrackBar"

// グローバル変数
static HINSTANCE	g_hInstance;
static HWND			g_hTrack;
static HWND			g_hLabel;

// プロトタイプ宣言
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
void OnHScroll();
void OnCreate(HWND hWnd);
void Trace(const char *pcFormat, ...);

int WINAPI WinMain(
	HINSTANCE	hInstance,
	HINSTANCE	hPrevInstance,
	LPSTR		lpCmdLine,
	int			nCmdShow)
{
	char acAppName[] = APPNAME;
	WNDCLASSEX	wcex;
	HWND		hWnd;
	MSG			msg;

g_hInstance = hInstance;

wcex.cbSize			= sizeof(WNDCLASSEX);
	wcex.style			= 0;
	wcex.lpfnWndProc	= WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= g_hInstance;
	wcex.hIcon			= LoadIcon(NULL, IDI_APPLICATION);
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_BTNFACE + 1);
	wcex.lpszMenuName	= NULL;
	wcex.lpszClassName	= acAppName;
	wcex.hIconSm		= LoadIcon(NULL, IDI_APPLICATION);
	RegisterClassEx(&wcex);

hWnd = CreateWindow(
		acAppName,			// ClassName
		acAppName,			// WindowName
		WS_POPUPWINDOW | WS_CAPTION | WS_MINIMIZEBOX,
		100,		// x
		100,		// y
		320,		// Width
		120,		// Height
		NULL,				// WndParent
		NULL,				// Menu
		g_hInstance,
		NULL);				// Param
	if (hWnd == NULL) {
		return 0;
	}

ShowWindow(hWnd, nCmdShow);

while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch (uMsg) {
	case WM_HSCROLL:
		OnHScroll();
		break;
	case WM_CREATE:
		OnCreate(hWnd);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hWnd, uMsg, wParam, lParam);
	}
	return 0;
}

void OnHScroll()
{
	int		iPos;
	char	acBuf[16];

iPos = (int)SendMessage(g_hTrack, TBM_GETPOS, 0, 0);
	Trace("OnHScroll(%d)\n", iPos);

sprintf_s(acBuf, sizeof(acBuf), "%d", iPos);
	SetWindowText(g_hLabel, acBuf);
}

void OnCreate(HWND hWnd)
{
	g_hTrack = CreateWindow(TRACKBAR_CLASS, NULL, WS_CHILD | WS_VISIBLE | TBS_AUTOTICKS,
		32, 16, 256, 32, hWnd, (HMENU)0, g_hInstance, NULL);
	SendMessage(g_hTrack, TBM_SETRANGE, (WPARAM)FALSE, MAKELPARAM(0, 127));
	SendMessage(g_hTrack, TBM_SETTICFREQ, (WPARAM)8, 0);

g_hLabel = CreateWindow("STATIC", "0", WS_CHILD | WS_VISIBLE,
		144, 64, 32, 16, hWnd, (HMENU)1, g_hInstance, NULL);
}

void Trace(const char *pcFormat, ...)
{
	va_list	args;
	char	acBuf[512];
	int		iRet;

va_start(args, pcFormat);
	iRet = vsprintf_s(acBuf, sizeof(acBuf), pcFormat, args);
	if (0 < iRet) {
		OutputDebugString(acBuf);
	}
	va_end(args);
}