C言語／C++/WorkArea - Sample is best!

開発環境	Microsoft Visual C++ 2010 Express (SP1)
実行環境	Microsoft Windows XP Home Edition (SP3)
プロジェクトの種類	Win32 プロジェクト
プロジェクト名	WorkArea
アプリケーションの種類	Windows アプリケーション
追加のオプション	空のプロジェクト
文字セット	Unicode

WorkArea.c

// Unicode
#include <Windows.h>
#include <stdio.h>
 
#define APP_NAME TEXT("WorkArea")
 
// 関数プロトタイプ宣言
void Trace(LPCTSTR format, ...);
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
void OnPaint(HWND hWnd);
void OnCreate(HWND hWnd);
 
//==============================================================================
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	WNDCLASSEX wcx;
	HWND hWnd;
	MSG msg;
 
	// ウィンドウクラスの登録
	ZeroMemory(&wcx, sizeof wcx);
	wcx.cbSize		= sizeof wcx;
	wcx.style		= CS_HREDRAW | CS_VREDRAW;
	wcx.lpfnWndProc		= WndProc;
	wcx.hInstance		= hInstance;
	wcx.hCursor		= LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW));
	wcx.hbrBackground	= (HBRUSH)(COLOR_WINDOW + 1);
	wcx.lpszClassName	= APP_NAME;
	if (RegisterClassEx(&wcx) == 0) {
		return 0;
	}
 
	// ウィンドウの作成
	hWnd = CreateWindow(
		APP_NAME, APP_NAME,
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, 0,
		CW_USEDEFAULT, 0,
		NULL, NULL, hInstance, NULL);
	if (hWnd == NULL) {
		return 0;
	}
	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);
 
	// メッセージループ
	while (GetMessage(&msg, NULL, 0, 0)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
 
	return msg.wParam;
}
 
//------------------------------------------------------------------------------
void Trace(LPCTSTR format, ...)
{
	va_list arg_ptr;
	TCHAR buffer[256];
	int size;
 
	va_start(arg_ptr, format);
	size = _vsnwprintf_s(buffer, _countof(buffer), _TRUNCATE, format, arg_ptr);
	va_end(arg_ptr);
	OutputDebugString(buffer);
	if (size < 0) {
		OutputDebugString(TEXT("...\n"));
	}
}
 
//------------------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch (uMsg) {
	case WM_PAINT:
		OnPaint(hWnd);
		return 0;
	case WM_CREATE:
		OnCreate(hWnd);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
 
//------------------------------------------------------------------------------
void OnPaint(HWND hWnd)
{
	TCHAR str[] = TEXT("hello, world");
	PAINTSTRUCT ps;
	HDC hdc = BeginPaint(hWnd, &ps);
	TextOut(hdc, 0, 0, str, wcslen(str));
	EndPaint(hWnd, &ps);
}
 
//------------------------------------------------------------------------------
void OnCreate(HWND hWnd)
{
	int cx, cy;
	RECT rc;
 
	cx = GetSystemMetrics(SM_CXSCREEN);
	cy = GetSystemMetrics(SM_CYSCREEN);
	Trace(L"CX:%d CY:%d\n", cx, cy);
 
	GetWindowRect(GetDesktopWindow(), &rc);
	Trace(L"Desktop L:%d T:%d R:%d B:%d\n", rc.left, rc.top, rc.right, rc.bottom);
 
	SystemParametersInfo(SPI_GETWORKAREA, 0, &rc, 0);
	Trace(L"WorkArea L:%d T:%d R:%d B:%d\n", rc.left, rc.top, rc.right, rc.bottom);
 
	SetWindowPos(hWnd, NULL, 0, 0, rc.right, rc.bottom, SWP_NOZORDER);
}
 

出力

CX:1920 CY:1200
Desktop L:0 T:0 R:1920 B:1200
WorkArea L:0 T:0 R:1920 B:1170