第五章 WHATSIZE

#include<windows.h>
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR szCmdLine,int nShowCmd)
{
	static TCHAR szAppName[]=TEXT("WHATSIZE");
	WNDCLASS wndclass;

	wndclass.cbClsExtra=0;
	wndclass.cbWndExtra=0;
	wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
	wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
	wndclass.hInstance=hInstance;
	wndclass.lpfnWndProc=WndProc;
	wndclass.lpszClassName=szAppName;
	wndclass.lpszMenuName=NULL;
	wndclass.style=CS_HREDRAW|CS_VREDRAW;

	if(!RegisterClass(&wndclass))
	{
		MessageBox(NULL,TEXT("Registe Class Failure!!"),szAppName,MB_ICONERROR);
		return 0;
	}

	HWND hWnd;
	hWnd=CreateWindow(szAppName,TEXT("TEST"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,
		CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
	ShowWindow(hWnd,nShowCmd);
	UpdateWindow(hWnd);

	tagMSG msg;
	while(GetMessage(&msg,hWnd,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}

void show(HWND hWnd,HDC hdc,int xText,int yText,int iMapMode,TCHAR *szMapMode)
{
	TCHAR szBuffer[60];
	RECT rect;

	SaveDC(hdc);
	SetMapMode(hdc,iMapMode);
	GetClientRect(hWnd,&rect);
	DPtoLP(hdc,(PPOINT)&rect,2);

	RestoreDC(hdc,-1);
	TextOut(hdc,xText,yText,szBuffer,wsprintf(szBuffer,TEXT("%-20s %7d %7d %7d %7d"),szMapMode,rect.left,rect.right,rect.top
		,rect.bottom));  //%-20表示左对齐
}

LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
	static TCHAR szHeading[]=TEXT("Mapping Mode Left Right Top Bottom");
	static TCHAR szUnderLine[]=TEXT("--------------------------------");
	static int cxChar,cyChar;
	HDC hdc;
	PAINTSTRUCT ps;
	TEXTMETRIC tm;

	switch(message)
	{
	case WM_CREATE:
		hdc=GetDC(hWnd);
		SelectObject(hdc,GetStockObject(SYSTEM_FIXED_FONT));

		GetTextMetrics(hdc,&tm);
		cxChar=tm.tmAveCharWidth;
		cyChar=tm.tmHeight+tm.tmExternalLeading;
		return 0;
	case WM_PAINT:
		hdc=BeginPaint(hWnd,&ps);
		SelectObject(hdc,GetStockObject(SYSTEM_FIXED_FONT));
		SetMapMode(hdc,MM_ANISOTROPIC);
		SetWindowExtEx(hdc,1,1,NULL);
		SetViewportExtEx(hdc,cxChar,cyChar,NULL);                        //设置视窗坐标系统单位制为cxChar,cyChar

		TextOut(hdc,1,1,szHeading,lstrlen(szHeading));
		TextOut(hdc,1,2,szUnderLine,lstrlen(szUnderLine));

		show(hWnd,hdc,1,3,MM_TEXT,TEXT("TEXT(pixels)"));
		show(hWnd,hdc,1,4,MM_LOMETRIC,TEXT("LOMETRIC(.1 mm)"));
		show(hWnd,hdc,1,5,MM_HIMETRIC,TEXT("HIMETRIC(.01 mm)"));
		show(hWnd,hdc,1,6,MM_LOENGLISH,TEXT("LOENGLISH(.01 in)"));
		show(hWnd,hdc,1,7,MM_HIENGLISH,TEXT("HIENGLISH(.001 in)"));
		show(hWnd,hdc,1,8,MM_TWIPS,TEXT("TWIPS(1/1440 in)"));

		EndPaint(hWnd,&ps);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hWnd,message,wParam,lParam);
}