爱悠闲 > WindowsAPI学习记录(键盘消息)

WindowsAPI学习记录(键盘消息)

分类: Windows学习日记  |  标签: windows,winapi  |  作者: u013517637 相关  |  发布日期 : 2015-06-02  |  热度 : 346°

下面的代码是来自于书上的,我那就按照自己的理解给下面的代码来一个自己的成果总结。

下面是一个头文件sysmets.h

/*-----------------------------------------------
   SYSMETS.H -- System metrics display structure
  -----------------------------------------------*/

#define NUMLINES ((int) (sizeof sysmetrics / sizeof sysmetrics [0]))

struct
{
     int     iIndex ;
     TCHAR * szLabel ;
     TCHAR * szDesc ;
}
sysmetrics [] =
{
     SM_CXSCREEN,             TEXT ("SM_CXSCREEN"),              
                              TEXT ("Screen width in pixels"),
     SM_CYSCREEN,             TEXT ("SM_CYSCREEN"),              
                              TEXT ("Screen height in pixels"),
     SM_CXVSCROLL,            TEXT ("SM_CXVSCROLL"),             
                              TEXT ("Vertical scroll width"),
     SM_CYHSCROLL,            TEXT ("SM_CYHSCROLL"),             
                              TEXT ("Horizontal scroll height"),
     SM_CYCAPTION,            TEXT ("SM_CYCAPTION"),             
                              TEXT ("Caption bar height"),
     SM_CXBORDER,             TEXT ("SM_CXBORDER"),              
                              TEXT ("Window border width"),
     SM_CYBORDER,             TEXT ("SM_CYBORDER"),              
                              TEXT ("Window border height"),
     SM_CXFIXEDFRAME,         TEXT ("SM_CXFIXEDFRAME"),          
                              TEXT ("Dialog window frame width"),
     SM_CYFIXEDFRAME,         TEXT ("SM_CYFIXEDFRAME"),          
                              TEXT ("Dialog window frame height"),
     SM_CYVTHUMB,             TEXT ("SM_CYVTHUMB"),              
                              TEXT ("Vertical scroll thumb height"),
     SM_CXHTHUMB,             TEXT ("SM_CXHTHUMB"),              
                              TEXT ("Horizontal scroll thumb width"),
     SM_CXICON,               TEXT ("SM_CXICON"),                
                              TEXT ("Icon width"),
     SM_CYICON,               TEXT ("SM_CYICON"),                
                              TEXT ("Icon height"),
     SM_CXCURSOR,             TEXT ("SM_CXCURSOR"),              
                              TEXT ("Cursor width"),
     SM_CYCURSOR,             TEXT ("SM_CYCURSOR"),              
                              TEXT ("Cursor height"),
     SM_CYMENU,               TEXT ("SM_CYMENU"),                
                              TEXT ("Menu bar height"),
     SM_CXFULLSCREEN,         TEXT ("SM_CXFULLSCREEN"),          
                              TEXT ("Full screen client area width"),
     SM_CYFULLSCREEN,         TEXT ("SM_CYFULLSCREEN"),          
                              TEXT ("Full screen client area height"),
     SM_CYKANJIWINDOW,        TEXT ("SM_CYKANJIWINDOW"),         
                              TEXT ("Kanji window height"),
     SM_MOUSEPRESENT,         TEXT ("SM_MOUSEPRESENT"),          
                              TEXT ("Mouse present flag"),
     SM_CYVSCROLL,            TEXT ("SM_CYVSCROLL"),             
                              TEXT ("Vertical scroll arrow height"),
     SM_CXHSCROLL,            TEXT ("SM_CXHSCROLL"),             
                              TEXT ("Horizontal scroll arrow width"),
     SM_DEBUG,                TEXT ("SM_DEBUG"),                 
                              TEXT ("Debug version flag"),
     SM_SWAPBUTTON,           TEXT ("SM_SWAPBUTTON"),            
                              TEXT ("Mouse buttons swapped flag"),
     SM_CXMIN,                TEXT ("SM_CXMIN"),                 
                              TEXT ("Minimum window width"),
     SM_CYMIN,                TEXT ("SM_CYMIN"),                 
                              TEXT ("Minimum window height"),
     SM_CXSIZE,               TEXT ("SM_CXSIZE"),                
                              TEXT ("Min/Max/Close button width"),
     SM_CYSIZE,               TEXT ("SM_CYSIZE"),                
                              TEXT ("Min/Max/Close button height"),
     SM_CXSIZEFRAME,          TEXT ("SM_CXSIZEFRAME"),           
                              TEXT ("Window sizing frame width"),
     SM_CYSIZEFRAME,          TEXT ("SM_CYSIZEFRAME"),           
                              TEXT ("Window sizing frame height"),
     SM_CXMINTRACK,           TEXT ("SM_CXMINTRACK"),            
                              TEXT ("Minimum window tracking width"),
     SM_CYMINTRACK,           TEXT ("SM_CYMINTRACK"),            
                              TEXT ("Minimum window tracking height"),
     SM_CXDOUBLECLK,          TEXT ("SM_CXDOUBLECLK"),           
                              TEXT ("Double click x tolerance"),
     SM_CYDOUBLECLK,          TEXT ("SM_CYDOUBLECLK"),           
                              TEXT ("Double click y tolerance"),
     SM_CXICONSPACING,        TEXT ("SM_CXICONSPACING"),         
                              TEXT ("Horizontal icon spacing"),
     SM_CYICONSPACING,        TEXT ("SM_CYICONSPACING"),         
                              TEXT ("Vertical icon spacing"),
     SM_MENUDROPALIGNMENT,    TEXT ("SM_MENUDROPALIGNMENT"),     
                              TEXT ("Left or right menu drop"),
     SM_PENWINDOWS,           TEXT ("SM_PENWINDOWS"),            
                              TEXT ("Pen extensions installed"),
     SM_DBCSENABLED,          TEXT ("SM_DBCSENABLED"),           
                              TEXT ("Double-Byte Char Set enabled"),
     SM_CMOUSEBUTTONS,        TEXT ("SM_CMOUSEBUTTONS"),         
                              TEXT ("Number of mouse buttons"),
     SM_SECURE,               TEXT ("SM_SECURE"),                
                              TEXT ("Security present flag"),
     SM_CXEDGE,               TEXT ("SM_CXEDGE"),                
                              TEXT ("3-D border width"),
     SM_CYEDGE,               TEXT ("SM_CYEDGE"),                
                              TEXT ("3-D border height"),
     SM_CXMINSPACING,         TEXT ("SM_CXMINSPACING"),          
                              TEXT ("Minimized window spacing width"),
     SM_CYMINSPACING,         TEXT ("SM_CYMINSPACING"),          
                              TEXT ("Minimized window spacing height"),
     SM_CXSMICON,             TEXT ("SM_CXSMICON"),              
                              TEXT ("Small icon width"),
     SM_CYSMICON,             TEXT ("SM_CYSMICON"),              
                              TEXT ("Small icon height"),
     SM_CYSMCAPTION,          TEXT ("SM_CYSMCAPTION"),           
                              TEXT ("Small caption height"),
     SM_CXSMSIZE,             TEXT ("SM_CXSMSIZE"),              
                              TEXT ("Small caption button width"),
     SM_CYSMSIZE,             TEXT ("SM_CYSMSIZE"),              
                              TEXT ("Small caption button height"),
     SM_CXMENUSIZE,           TEXT ("SM_CXMENUSIZE"),            
                              TEXT ("Menu bar button width"),
     SM_CYMENUSIZE,           TEXT ("SM_CYMENUSIZE"),            
                              TEXT ("Menu bar button height"),
     SM_ARRANGE,              TEXT ("SM_ARRANGE"),               
                              TEXT ("How minimized windows arranged"),
     SM_CXMINIMIZED,          TEXT ("SM_CXMINIMIZED"),           
                              TEXT ("Minimized window width"),
     SM_CYMINIMIZED,          TEXT ("SM_CYMINIMIZED"),           
                              TEXT ("Minimized window height"),
     SM_CXMAXTRACK,           TEXT ("SM_CXMAXTRACK"),            
                              TEXT ("Maximum dragable width"),
     SM_CYMAXTRACK,           TEXT ("SM_CYMAXTRACK"),            
                              TEXT ("Maximum dragable height"),
     SM_CXMAXIMIZED,          TEXT ("SM_CXMAXIMIZED"),           
                              TEXT ("Width of maximized window"),
     SM_CYMAXIMIZED,          TEXT ("SM_CYMAXIMIZED"),           
                              TEXT ("Height of maximized window"),
     SM_NETWORK,              TEXT ("SM_NETWORK"),               
                              TEXT ("Network present flag"),
     SM_CLEANBOOT,            TEXT ("SM_CLEANBOOT"),             
                              TEXT ("How system was booted"),
     SM_CXDRAG,               TEXT ("SM_CXDRAG"),                
                              TEXT ("Avoid drag x tolerance"),
     SM_CYDRAG,               TEXT ("SM_CYDRAG"),                
                              TEXT ("Avoid drag y tolerance"),
     SM_SHOWSOUNDS,           TEXT ("SM_SHOWSOUNDS"),            
                              TEXT ("Present sounds visually"),
     SM_CXMENUCHECK,          TEXT ("SM_CXMENUCHECK"),           
                              TEXT ("Menu check-mark width"),
     SM_CYMENUCHECK,          TEXT ("SM_CYMENUCHECK"),           
                              TEXT ("Menu check-mark height"),
     SM_SLOWMACHINE,          TEXT ("SM_SLOWMACHINE"),           
                              TEXT ("Slow processor flag"),
     SM_MIDEASTENABLED,       TEXT ("SM_MIDEASTENABLED"),        
                              TEXT ("Hebrew and Arabic enabled flag"),
     SM_MOUSEWHEELPRESENT,    TEXT ("SM_MOUSEWHEELPRESENT"),     
                              TEXT ("Mouse wheel present flag"),
     SM_XVIRTUALSCREEN,       TEXT ("SM_XVIRTUALSCREEN"),        
                              TEXT ("Virtual screen x origin"),
     SM_YVIRTUALSCREEN,       TEXT ("SM_YVIRTUALSCREEN"),        
                              TEXT ("Virtual screen y origin"),
     SM_CXVIRTUALSCREEN,      TEXT ("SM_CXVIRTUALSCREEN"),       
                              TEXT ("Virtual screen width"),
     SM_CYVIRTUALSCREEN,      TEXT ("SM_CYVIRTUALSCREEN"),       
                              TEXT ("Virtual screen height"),
     SM_CMONITORS,            TEXT ("SM_CMONITORS"),             
                              TEXT ("Number of monitors"),
     SM_SAMEDISPLAYFORMAT,    TEXT ("SM_SAMEDISPLAYFORMAT"),     
                              TEXT ("Same color format flag")
} ;
下面是源码
/*----------------------------------------------------
   SYSMETS4.C -- System Metrics Display Program No. 4
                 (c) Charles Petzold, 1998
  ----------------------------------------------------*/

#define WINVER 0x0500
#include <windows.h>
#include "sysmets.h"

LRESULT CALLBACK WndProc (HWND,UINT,WPARAM,LPARAM);//回调函数的声明

int WINAPI WinMain(HINSTANCE hInstance,//当前实例句柄
		HINSTANCE hPrevInstance,//先前实例句柄
		LPSTR szCmdLine,//命令行
		int iCmdShow)//显示状态
{
	static TCHAR szAppName[]=TEXT("Sysmets4");
	HWND hwnd;//当前实例的句炳
	MSG msg;//消息
	WNDCLASS wndclass;//窗口类名

	wndclass.style=CS_HREDRAW | CS_VREDRAW;//窗口风格,分别为水平重画和竖直重画

 
 
wndclass.cbClsExtra=0;//窗口扩展,一般为0 wndclass.cbWndExtra=0;//窗口实例扩展,一般为0 wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);//窗口背景颜色,此处为白色 wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);//窗口图标 wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);//窗口鼠标光标 wndclass.hInstance=hInstance;//实例句柄 wndclass.lpfnWndProc=WndProc;//回调函数 wndclass.lpszClassName=szAppName;//窗口类的名字 wndclass.lpszMenuName=NULL;//菜单名,此处没有 if(!RegisterClass(&wndclass))//注册窗口 { MessageBox(NULL,TEXT("Program requires Windows NT!"), szAppName,MB_ICONERROR); return 0; } hwnd=CreateWindow(szAppName,TEXT("Get System Metrics No.4"),//创建窗口 WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL, CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, NULL,NULL,hInstance,NULL); ShowWindow(hwnd,iCmdShow);//显示窗口 UpdateWindow(hwnd);//更新窗口 while(GetMessage(&msg,NULL,0,0))//消息循环 { TranslateMessage(&msg); DispatchMessage(&msg); } return msg.wParam; } LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam) { static int cxChar,cyChar,cxCaps,cxClient,cyClient,iMaxWidth; HDC hdc; int i,x,y,iVertPos,iHorzPos,iPaintBeg,iPaintEnd; PAINTSTRUCT ps;//绘图结构 SCROLLINFO si;//滚动条结构 TCHAR szBuffer[10];//字符串 TEXTMETRIC tm;//字体信息结构 switch(message) { case WM_CREATE: hdc=GetDC(hwnd); GetTextMetrics(hdc,&tm);//获取系统字体信息,用tm来保存 cxChar=tm.tmAveCharWidth;//平均字符的宽度 cyChar=tm.tmHeight+tm.tmExternalLeading;//字符总高度=字符平均高度+字符间距
		cxCaps=(tm.tmPitchAndFamily&1?3:2)*cxChar/2;//大写字符的平均宽度

		ReleaseDC(hwnd,hdc);//获取环境信息之后,释放句柄

		iMaxWidth=40*cxChar+22*cxCaps;//窗口总宽度
		return 0;
	case WM_SIZE:
		cxClient=LOWORD(lParam);//窗口宽度
		cyClient=HIWORD(lParam);//窗口高度

		si.cbSize=sizeof(si);
		si.fMask=SIF_RANGE | SIF_PAGE;
		si.nMax=NUMLINES-1;
		si.nMin=0;
		si.nPage=cyClient/cyChar;
		SetScrollInfo(hwnd,SB_VERT,&si,TRUE);//修改竖直滚动条的信息

		si.cbSize=sizeof(si);
		si.fMask=SIF_RANGE | SIF_PAGE;
		si.nMin=0;
		si.nMax=2+iMaxWidth / cxChar;
		si.nPage=cxClient/cxChar;
		SetScrollInfo(hwnd,SB_HORZ,&si,TRUE);//修改水平滚动条的信息
		return 0;
	case WM_VSCROLL:
		si.cbSize=sizeof(si);
		si.fMask=SIF_ALL;
		GetScrollInfo(hwnd,SB_VERT,&si);//获取竖直滚动条的消息
		iVertPos=si.nPos;
		switch(LOWORD(wParam))
		{
		case SB_TOP:
			si.nPos=si.nMin;
			break;
		case SB_BOTTOM:
			si.nPos=si.nMax;
			break;
		case SB_LINEUP:
			si.nPos-=1;
			break;
		case SB_LINEDOWN:
			si.nPos+=1;
			break;
		case SB_PAGEUP:
			si.nPos-=si.nPage;
			break;
		case SB_PAGEDOWN:
			si.nPos+=si.nPage;
		case SB_THUMBTRACK:
			si.nPos=si.nTrackPos;
			break;
		default:
			break;
		}

		si.fMask=SIF_POS;
		SetScrollInfo(hwnd,SB_VERT,&si,TRUE);//重新修改操作之后的竖直滚动条的信息
		GetScrollInfo(hwnd,SB_VERT,&si);//获取改动后的信息

		if(si.nPos!=iVertPos)
		{
			ScrollWindow(hwnd,0,cyChar*(iVertPos-si.nPos),NULL,NULL);
			UpdateWindow(hwnd);
		}
		return 0;
		
		case WM_HSCROLL:
			si.cbSize=sizeof(si);
			si.fMask=SIF_ALL;

			GetScrollInfo(hwnd,SB_HORZ,&si);//获取水平滚动条的信息
			iHorzPos=si.nPos;

			switch(LOWORD(wParam))
			{
			case SB_LINELEFT:
				si.nPos-=1;
				break;
			case SB_LINERIGHT:
				si.nPos+=1;
				break;
			case SB_PAGELEFT:
				si.nPos-=si.nPage;
				break;
			case SB_PAGERIGHT:
				si.nPos+=si.nPage;
				break;
			case SB_THUMBPOSITION:
				si.nPos=si.nTrackPos;
				break;
			default:
				break;
			}
			
			si.fMask=SIF_POS;
			SetScrollInfo(hwnd,SB_HORZ,&si,TRUE);//修改操作后的水平滚动条的信息
			GetScrollInfo(hwnd,SB_HORZ,&si);//获取改动后的消息

			if(si.nPos!=iHorzPos)
			{
				ScrollWindow(hwnd,cxChar*(iHorzPos-si.nPos),0,NULL,NULL);
			}
			return 0;
			

		case WM_KEYDOWN://按键操作,把按键的信息通过SendMessage函数传递给滚动条,进而操纵滚动条
			switch(wParam)
			{
			case VK_HOME:
				SendMessage(hwnd,WM_VSCROLL,SB_TOP,0);
				break;
			case VK_END:
				SendMessage(hwnd,WM_VSCROLL,SB_BOTTOM,0);
				break;
			case VK_PRIOR:
				SendMessage(hwnd,WM_VSCROLL,SB_PAGEUP,0);
				break;
			case VK_NEXT:
				SendMessage(hwnd,WM_VSCROLL,SB_PAGEDOWN,0);
				break;
			case VK_UP:
				SendMessage(hwnd,WM_VSCROLL,SB_LINEUP,0);
				break;
			case VK_DOWN:
				SendMessage(hwnd,WM_VSCROLL,SB_LINEDOWN,0);
				break;
			case VK_LEFT:
				SendMessage(hwnd,WM_HSCROLL,SB_PAGEUP,0);
				break;
			case VK_RIGHT:
				SendMessage(hwnd,WM_HSCROLL,SB_PAGERIGHT,0);
				break;
			}
			return 0;
		case WM_PAINT://绘制窗口
			hdc=BeginPaint(hwnd,&ps);
			si.cbSize=sizeof(si);
			si.fMask=SIF_POS;
			GetScrollInfo(hwnd,SB_VERT,&si);
			iVertPos=si.nPos;

			GetScrollInfo(hwnd,SB_HORZ,&si);
			iHorzPos=si.nPos;

			iPaintBeg = max (0, iVertPos + ps.rcPaint.top / cyChar) ;//max(0,当前位置+需要绘图的矩形区的最高点/字符的高度)  
			iPaintEnd = min (NUMLINES - 1,
                           iVertPos + ps.rcPaint.bottom / cyChar) ;//绘图结束的地方 = 当前位置+绘制去取的高度
          
			for (i = iPaintBeg ; i <= iPaintEnd ; i++)
			{
               x = cxChar * (1 - iHorzPos) ;
               y = cyChar * (i - iVertPos) ;
               
               TextOut (hdc, x, y,
                        sysmetrics[i].szLabel,
                        lstrlen (sysmetrics[i].szLabel)) ;
               
               TextOut (hdc, x + 22 * cxCaps, y,
                        sysmetrics[i].szDesc,
                        lstrlen (sysmetrics[i].szDesc)) ;
               
               SetTextAlign (hdc, TA_RIGHT | TA_TOP) ;
               
               TextOut (hdc, x + 22 * cxCaps + 40 * cxChar, y, szBuffer,
                        wsprintf (szBuffer, TEXT ("%5d"),
                             GetSystemMetrics (sysmetrics[i].iIndex))) ;
               
               SetTextAlign (hdc, TA_LEFT | TA_TOP) ;
			}

			EndPaint(hwnd,&ps);
			return 0;
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;

	}		
	return DefWindowProc(hwnd,message,wParam,lParam);
}