在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
{8as _
;.wWw" ) 一、实现方法
km+}./@ Ls~F4ar$/ 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
EPMdR66 oN/T>&d #pragma data_seg("shareddata")
8E9W\@\ HHOOK hHook =NULL; //钩子句柄
2(Ez
H UINT nHookCount =0; //挂接的程序数目
_O*"_^6 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
@vcvte static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Tl ?]K static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
U3zwC5}BN static int KeyCount =0;
3cztMi static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
?]bZ6|;2 #pragma data_seg()
I%q&4L7pj d,0Yi
u.p 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
r\sQ8/ k2S6 SB DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
MX.=k> =5yI>A0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
E*_lT`Hzf cKey,UCHAR cMask)
V$7SVq {
}\oy?_8~ BOOL bAdded=FALSE;
{V)Z!D for(int index=0;index<MAX_KEY;index++){
ctg[C$<q| if(hCallWnd[index]==0){
pdQ6/vh hCallWnd[index]=hWnd;
jSyF]$" HotKey[index]=cKey;
5I(gP HotKeyMask[index]=cMask;
TXlxnB bAdded=TRUE;
u4kg#+H KeyCount++;
zFtRsa5+ break;
B[R1XpB7 }
$A/$M\: }
Wi?37EHr return bAdded;
k_c8\::p# }
2Hp#~cE+. //删除热键
c%+9uu3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'nFqq:2Xa {
ZJxUv
{J BOOL bRemoved=FALSE;
(|PxR#{l< for(int index=0;index<MAX_KEY;index++){
qq+fUfB2: if(hCallWnd[index]==hWnd){
7TC=$y , if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#sq$i hCallWnd[index]=NULL;
_=.f+1W HotKey[index]=0;
9rn[46s` HotKeyMask[index]=0;
>|[74#}7 bRemoved=TRUE;
MOIH%lpe KeyCount--;
`<C/-Au break;
Y M_\ ZK: }
i-b++R/WN }
7xOrG],E }
wER>a ( return bRemoved;
JKkR963 O }
P*#H]Pv }cL9`a9j [8VB"{{& DLL中的钩子函数如下:
TuBl9 p'6 ]tVU$9D LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<E(#;F^y {
W:7oGZ>4 BOOL bProcessed=FALSE;
Vc!;O9dP if(HC_ACTION==nCode)
/Wh}
;YTv^ {
}D7q)_g= if((lParam&0xc0000000)==0xc0000000){// 有键松开
/l,V0+p switch(wParam)
yB7=8 Pcx {
'y
[eH case VK_MENU:
;-d }\f , MaskBits&=~ALTBIT;
^+JpI*, break;
wPn#>\/L case VK_CONTROL:
-
T,;Fr' MaskBits&=~CTRLBIT;
%s;#epP$ break;
XM$HHk}L; case VK_SHIFT:
Q`qHzb~% MaskBits&=~SHIFTBIT;
@eRR#S break;
l!plw,PYC default: //judge the key and send message
D-/K'|b break;
6BihZ|H04 }
X;7gh>Q'4 for(int index=0;index<MAX_KEY;index++){
m"~^-mJ- if(hCallWnd[index]==NULL)
9ZL3p! continue;
@LS*WJ< w- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Wb] ha1$ {
lEBt< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,OX(z=i_ bProcessed=TRUE;
#cqia0.H }
gc 14 % }
Hb KJ&^ }
gL(ny/Ob9 else if((lParam&0xc000ffff)==1){ //有键按下
&i8AB{OU switch(wParam)
W27EU/+3 {
iw\RQ
0 case VK_MENU:
ec:?Q0 MaskBits|=ALTBIT;
ISI\<qx break;
8'Z#sM^E case VK_CONTROL:
;^}gC}tq MaskBits|=CTRLBIT;
FY [WdZDZ break;
0Ii*
"?s case VK_SHIFT:
dyRKmLb MaskBits|=SHIFTBIT;
9pKN^FX,76 break;
fQ5VRpWGn default: //judge the key and send message
C:/O]slH break;
l@a>"\><i* }
:=BFx"Y for(int index=0;index<MAX_KEY;index++){
Wc4F'}s if(hCallWnd[index]==NULL)
ErK5iTSD continue;
-aDGXQM{~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/vi>@a {
m]8rljo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4tR:O#($V bProcessed=TRUE;
$9DV} }
sv0)sL }
wR\Y+Z }
d0y
[: if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
CA)DQYp{ for(int index=0;index<MAX_KEY;index++){
"P<IQx if(hCallWnd[index]==NULL)
NDW6UFd>1 continue;
wfQ6J0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
D9M<>Xz) SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0Zp)
DM //lParam的意义可看MSDN中WM_KEYDOWN部分
Y]aVa2!Wb }
MzRwsf }
D.zEE-cGyb }
Vv4w?K return CallNextHookEx( hHook, nCode, wParam, lParam );
~ztsR;iL }
=B g a9C8Q
l 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
bT<if@h- n}MW# :eJe BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Yy6Mkw7X BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)-q#hY 9kmkF, 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
>M{=qs luYkC@I@a LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
kw&,<V77 ~ {
=X[]0.I% if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
`0Y`]kSY+ {
-xS{{"- //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
<H{%` SaveBmp();
=&RpW7] return FALSE;
;*^2,_ }
+G';no\h …… //其它处理及默认处理
.}n%gc~A }
0b%"=J2/p. {.=089`{ #~l(t_m{ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
fvn`$ DD`Bl1) 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
T
22tZp 8yEN)RqI 二、编程步骤
64Gd^.Z 4RCD<7 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
SJb+:L> (- `h8M 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
jC3ta EkotVzR5 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
!sWKi)1 m2 0:{fld 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
hK F*{,' .?T,>#R 5、 添加代码,编译运行程序。
6)i4& #9-qF9M 三、程序代码
u~WBu| npC:SrI% ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
"mlVs/nsyG #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
E9e|+$ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
'4-J0S<<_ #if _MSC_VER > 1000
`|maf=SnY5 #pragma once
{;uOc{~+ #endif // _MSC_VER > 1000
5}S~8 #ifndef __AFXWIN_H__
XpWcf ([ #error include 'stdafx.h' before including this file for PCH
>yk@t&j, #endif
w<=?%+n #include "resource.h" // main symbols
-]$q8Q(hM class CHookApp : public CWinApp
G?`{OW3:_ {
-D*,*L public:
8S*3W3HY CHookApp();
4&b*|"Iw // Overrides
kr ,&aP<, // ClassWizard generated virtual function overrides
=-wF Brw //{{AFX_VIRTUAL(CHookApp)
qWz%sT?C3L public:
3@#WY vD virtual BOOL InitInstance();
Er /:iO)_ virtual int ExitInstance();
/-%0y2"7 //}}AFX_VIRTUAL
D d['e //{{AFX_MSG(CHookApp)
$gZC"~BR // NOTE - the ClassWizard will add and remove member functions here.
qiEw[3Za]' // DO NOT EDIT what you see in these blocks of generated code !
I'6wh+ //}}AFX_MSG
Z:>)5Z{' DECLARE_MESSAGE_MAP()
t}FwS6u };
=PU!hZj"L LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
`sW+R= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
zt&"K0X| BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/e|vz^#+1, BOOL InitHotkey();
X5[.X()M4 BOOL UnInit();
v\&C]W] #endif
"[A]tklP ^j~CYzmt //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=CBY_ #include "stdafx.h"
MZJ@qIg[Y #include "hook.h"
v_U+wga #include <windowsx.h>
i2bkgyzB. #ifdef _DEBUG
Xy(8} #define new DEBUG_NEW
`Hlv*" w$ #undef THIS_FILE
ZC7ZlL_ static char THIS_FILE[] = __FILE__;
$2!|e,x #endif
;t6)(d4z? #define MAX_KEY 100
}EJAC*W, #define CTRLBIT 0x04
s=KK)6T #define ALTBIT 0x02
O4`am:@ #define SHIFTBIT 0x01
3m;*gOLk6 #pragma data_seg("shareddata")
?7;_3+T# HHOOK hHook =NULL;
.VD:FFkW UINT nHookCount =0;
9):h
%o static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
oU|yBs1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
:8(
"n1^ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`^d [$IbDW static int KeyCount =0;
hCpX#rg? static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
nDG41)| #pragma data_seg()
{$
a
$m HINSTANCE hins;
-_`dA^ void VerifyWindow();
X(r$OZ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
`1xJ1z# //{{AFX_MSG_MAP(CHookApp)
vZ6_/ew8 // NOTE - the ClassWizard will add and remove mapping macros here.
Al93x // DO NOT EDIT what you see in these blocks of generated code!
e-&0f);i //}}AFX_MSG_MAP
|.]g&m)y^h END_MESSAGE_MAP()
&];:uYmMU T)CEcz CHookApp::CHookApp()
5~ip N/)E {
}Bk>' // TODO: add construction code here,
@#u'z~a) // Place all significant initialization in InitInstance
:`Sd5b> }
+HAd=DU []L
yu CHookApp theApp;
QmiS/`AAv LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
XEX-NE"] {
r
&.gOC BOOL bProcessed=FALSE;
]K<mkUpY if(HC_ACTION==nCode)
V;N'?Gu {
PR+L6DT_ if((lParam&0xc0000000)==0xc0000000){// Key up
7my7|s[ switch(wParam)
Ung K9uB~ {
~;AJB case VK_MENU:
.\rJ|HpZ1J MaskBits&=~ALTBIT;
1yK=Yf%B break;
!C6[m1F case VK_CONTROL:
|g`:K0BI MaskBits&=~CTRLBIT;
AQ<2 "s break;
'uBagd>* case VK_SHIFT:
W{!Slf MaskBits&=~SHIFTBIT;
5Sh.4A\ break;
%^qf0d* default: //judge the key and send message
|V
dr/' break;
k $d+w][ }
(@(rz/H for(int index=0;index<MAX_KEY;index++){
7eU|iDYo if(hCallWnd[index]==NULL)
^630%YO continue;
(?ofL|Cg( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
CqAv^n7 } {
O!3`^_. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
>|W\8dTQ bProcessed=TRUE;
dN)@/R^E; }
:c/](M }
o0B3G }
u27*-X
5 else if((lParam&0xc000ffff)==1){ //Key down
BpR#3CfW switch(wParam)
)4O* D92 {
}"\jB case VK_MENU:
&Jf67\N MaskBits|=ALTBIT;
a?
<Ar#)j break;
eb*w$|y6" case VK_CONTROL:
n38l!m(. MaskBits|=CTRLBIT;
6Gj69Lr break;
|+h8g@;Z case VK_SHIFT:
_ry7[/) MaskBits|=SHIFTBIT;
&60#y4 break;
q% pjY default: //judge the key and send message
/4{.J=R} break;
-;s-*$I }
n[c/L8j for(int index=0;index<MAX_KEY;index++)
&{=`g+4n {
V|T3blG?D if(hCallWnd[index]==NULL)
~=Q|EhF5 continue;
p}K\rpvJpu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$ 0Up. {
*nYb9.T]i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
O8<@+xlX bProcessed=TRUE;
2E/yZ ~2s }
P$hmDTn72 }
*{%d{x}l }
$g @-WNe if(!bProcessed){
A1kqWhg\ for(int index=0;index<MAX_KEY;index++){
l
]CnLqf& if(hCallWnd[index]==NULL)
2nv-/%] continue;
y^tp^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
\?K>~{) SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
5Vu@gRk_ }
A6AIkKjzq }
ffibS0aM }
`7o(CcF6H return CallNextHookEx( hHook, nCode, wParam, lParam );
yq,%ey8 }
)u}My Fl. !vwx0 BOOL InitHotkey()
>G<.^~o {
,].S~6IM if(hHook!=NULL){
1v"r8=Wt nHookCount++;
\*x=q20 return TRUE;
=2tl149m/z }
&-B&s.,kj else
Q!(qL[o hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
.=% ,DT" if(hHook!=NULL)
m=e#1Hs nHookCount++;
z<Y
>phc return (hHook!=NULL);
>^V3Z{; }
*=~X1s BOOL UnInit()
lBcRt)_O7 {
H>Ws)aCq if(nHookCount>1){
lk. ; nHookCount--;
}rbsarG@ return TRUE;
1Yb9ILX[J }
BdYl
sYp BOOL unhooked = UnhookWindowsHookEx(hHook);
$" `9QD~ if(unhooked==TRUE){
h6Q-+_5 nHookCount=0;
eK_Yt~dj hHook=NULL;
}RPeAcbU_ }
NX5NE2@^qH return unhooked;
g$eZT{{W }
Z+J;nl $KGpcl BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
mzoNXf:x {
}N}\<RG BOOL bAdded=FALSE;
8QaF(? for(int index=0;index<MAX_KEY;index++){
J"W+9sI0 if(hCallWnd[index]==0){
J`@#yHL hCallWnd[index]=hWnd;
q oJ4w7 HotKey[index]=cKey;
Ze>Pg.k+ HotKeyMask[index]=cMask;
k w]m7T bAdded=TRUE;
eHy.<VX KeyCount++;
i<]Y0_?s break;
#&jr9RB }
9'S~zG%{ }
Uk0]A return bAdded;
dtT2h>h9 }
kn 1+lF@ A_\ZY0Xt BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sJ(q.FRM' {
A[.5Bi BOOL bRemoved=FALSE;
A1u|L^ for(int index=0;index<MAX_KEY;index++){
<1EmQ)B if(hCallWnd[index]==hWnd){
~RS^Opoa if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{Q@pF hCallWnd[index]=NULL;
|}y6U< I HotKey[index]=0;
B%e#u.'6 HotKeyMask[index]=0;
<0hJo=6a8 bRemoved=TRUE;
uY5Gn.Y KeyCount--;
S.kFs{;1x break;
dPfDPb }
1>1ii }
*;I F^u1 }
>RMp`HxDf return bRemoved;
r31H Zx1^ }
/ Dn \jcEEIEi void VerifyWindow()
b2vc {
>X(,(mKi for(int i=0;i<MAX_KEY;i++){
RZ:i60 if(hCallWnd
!=NULL){ A t#'q>Dn
if(!IsWindow(hCallWnd)){ V^^nJs
tV
hCallWnd=NULL; `Wf)qMb
HotKey=0; Nu%JI6&R
HotKeyMask=0; |UO&18Y7-
KeyCount--; h c9?z}
} V,@Y,
} T'TxC)
} s`$px2Gw
} vs)1Rm
@Fl&@ $
BOOL CHookApp::InitInstance() cKj6tT"=O
{ [Bz'c1
AFX_MANAGE_STATE(AfxGetStaticModuleState()); uPtHCP6
hins=AfxGetInstanceHandle(); sa71Vh{
InitHotkey(); &2!F:L
return CWinApp::InitInstance(); ZoiCdXvTN
} 9g*MBe:
R{"7q:-
int CHookApp::ExitInstance() |F'k5Lh
{ 1wqsGad+;
VerifyWindow(); ^5l4D3@E
UnInit(); CbA2?( 1o1
return CWinApp::ExitInstance(); $ZPiM
} 5 ^\f[}
QzQTE-SQ
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NNQro)Lpe
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3t4_{']:/
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "16-K%}
#if _MSC_VER > 1000 Czs4jHTa`
#pragma once 62Ab4!
#endif // _MSC_VER > 1000 gr/o!NC
srN>pO8u~
class CCaptureDlg : public CDialog #6tb{ws3
{ ly d[GfJ
// Construction ;5P>R[p
public: fQ&:1ec
BOOL bTray; 3}H"(5dL}z
BOOL bRegistered; ve#cz2Z
BOOL RegisterHotkey(); oJk$ +v6
UCHAR cKey; QrP$5H{[E
UCHAR cMask; 042sjt
void DeleteIcon(); <9S?wju4W'
void AddIcon(); KJwkkCE/=
UINT nCount; I]`>m3SJ
void SaveBmp(); ~[i,f0O,
CCaptureDlg(CWnd* pParent = NULL); // standard constructor CMIjc(m
// Dialog Data PUUBn"U-
//{{AFX_DATA(CCaptureDlg) ,T{(t@
enum { IDD = IDD_CAPTURE_DIALOG }; pPm9v_G
CComboBox m_Key; |f^/((:D
BOOL m_bControl; ua['rOnU
BOOL m_bAlt; dQ8}mH!
BOOL m_bShift; {. N" 6P
CString m_Path; #lax0IYY=
CString m_Number; {Y9m;b,X
//}}AFX_DATA #=f ]"uM<
// ClassWizard generated virtual function overrides X,/@#pSOz
//{{AFX_VIRTUAL(CCaptureDlg) xw5E!]~D
public: F6T@YSP
virtual BOOL PreTranslateMessage(MSG* pMsg); bp6 La`+
protected: $a6&OH/
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C61KY7iyR
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '"5"$)7
//}}AFX_VIRTUAL [FKmZzEy
// Implementation tIb?23K0
protected: T[=XGAJ
HICON m_hIcon; _9Kdcoh
// Generated message map functions hnM|=[wM
//{{AFX_MSG(CCaptureDlg) O\L(I079
virtual BOOL OnInitDialog(); <ZJ>jZV0*
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N1Y*IkW"
afx_msg void OnPaint(); VwoCRq*
afx_msg HCURSOR OnQueryDragIcon(); (~TP
virtual void OnCancel(); `5`Pv'`
afx_msg void OnAbout(); [&rW+/
afx_msg void OnBrowse(); 0>-l {4srs
afx_msg void OnChange(); n>\BPiz
//}}AFX_MSG YtNoYOB
DECLARE_MESSAGE_MAP() AQ-P3`bCb
}; d8g3hyI5\
#endif Q=yQEh|Y
Dd*T5A?
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HPAg1bV:-
#include "stdafx.h" Z{/C4" F
#include "Capture.h" `^s(r>2
#include "CaptureDlg.h" sp[nKo^
#include <windowsx.h> {"e/3
#pragma comment(lib,"hook.lib") 0x0.[1mB
#ifdef _DEBUG ..7"&-?g{4
#define new DEBUG_NEW 1+o >#8D
#undef THIS_FILE "t8mQ;n
static char THIS_FILE[] = __FILE__; {!B0&x
#endif C%v@u$N
#define IDM_SHELL WM_USER+1 -,96Qg4vI
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0At??Zpy
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b]mRn{r?
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; DB_
x
class CAboutDlg : public CDialog 71Ssk|L
{ u *z $ I
public: [*?P2.b f
CAboutDlg(); #l-,2C~
// Dialog Data ']f]:X;6w
//{{AFX_DATA(CAboutDlg) x}1(okc
enum { IDD = IDD_ABOUTBOX }; ~SJOynSz,
//}}AFX_DATA ls,gQ]B:P
// ClassWizard generated virtual function overrides ")HTUlcAe}
//{{AFX_VIRTUAL(CAboutDlg) sEdWBT 8
protected: Z8kO*LYv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QA.B.U7!
//}}AFX_VIRTUAL <V"'j
// Implementation .F)b9d[?
protected: '[5tc fG#z
//{{AFX_MSG(CAboutDlg) V:!fe+Er
//}}AFX_MSG Px=/fO G
DECLARE_MESSAGE_MAP() itD1r?O{pV
}; 2=!/)hw}
n=t%,[Op
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) HqOSQ<-Fo
{ *ARro
Ndr
//{{AFX_DATA_INIT(CAboutDlg) U*k$pp6\b~
//}}AFX_DATA_INIT nAd
4g|
} 7G%`ziZ
xzMa[D4(
void CAboutDlg::DoDataExchange(CDataExchange* pDX) RGLwtN
{ KE YM@,'
CDialog::DoDataExchange(pDX); jzEimKDE's
//{{AFX_DATA_MAP(CAboutDlg) GG;M/}E9
//}}AFX_DATA_MAP .6$ST Ksr
} u|8`=
pa+^5N
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) h+.^8fPR
//{{AFX_MSG_MAP(CAboutDlg) V85a{OBm,8
// No message handlers C(iA G
//}}AFX_MSG_MAP 7"*-
>mg
END_MESSAGE_MAP() &.<{c
`-
yQ+#Tlji
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m98k/w_
: CDialog(CCaptureDlg::IDD, pParent) EE&~D~yHUL
{ yYdXAenQ
//{{AFX_DATA_INIT(CCaptureDlg) fgl"ox
m_bControl = FALSE; YQ37P?u@
m_bAlt = FALSE; Rl3KE)<
m_bShift = FALSE; .1|'9@]lj4
m_Path = _T("c:\\"); ?e]4HHgU]
m_Number = _T("0 picture captured."); orzdq
nCount=0; p//">l=Ps
bRegistered=FALSE; Os@ofnC
bTray=FALSE; F6Q #{Ufq
//}}AFX_DATA_INIT giaO7Qh~
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HE+VanY![
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )CdglPK
} O:lD>A4{
f
21w`Uk48
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1 ,D2][
{ "!Mu5Ga
CDialog::DoDataExchange(pDX); uaJ5'*
//{{AFX_DATA_MAP(CCaptureDlg) A7|"0*62
DDX_Control(pDX, IDC_KEY, m_Key);
pb E`Eq
DDX_Check(pDX, IDC_CONTROL, m_bControl); S*#y7YKI
DDX_Check(pDX, IDC_ALT, m_bAlt); 30<dEoF
DDX_Check(pDX, IDC_SHIFT, m_bShift); 92
Pp.Rh
DDX_Text(pDX, IDC_PATH, m_Path); "5dh]-m n
DDX_Text(pDX, IDC_NUMBER, m_Number); %iD>^ Dp
//}}AFX_DATA_MAP *A,=Y/
} [(btpWxb^
kmov(V
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G0]q(.sOy
//{{AFX_MSG_MAP(CCaptureDlg) 8%
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ON_WM_SYSCOMMAND() ~01rc
ON_WM_PAINT() ~ xf9
ml
ON_WM_QUERYDRAGICON() u0XGtu$4
ON_BN_CLICKED(ID_ABOUT, OnAbout) <,rjU*"
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {b/AOR
o
ON_BN_CLICKED(ID_CHANGE, OnChange) Z"!C
//}}AFX_MSG_MAP @4$F%[g
h
END_MESSAGE_MAP() G =< KAJ
SC|cCK hqi
BOOL CCaptureDlg::OnInitDialog() M9f*7{c
{ u%}vTCg*p
CDialog::OnInitDialog(); )[nzmL*w
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); t'9E~_!C
ASSERT(IDM_ABOUTBOX < 0xF000); IyP\7WZ
CMenu* pSysMenu = GetSystemMenu(FALSE); Ujj2A^
if (pSysMenu != NULL) tanuP@O
{ )2^OBfl7
CString strAboutMenu; 31b-r[B{%
strAboutMenu.LoadString(IDS_ABOUTBOX); z9dVT'
if (!strAboutMenu.IsEmpty()) E>'pMw
{ NoYu"57\
pSysMenu->AppendMenu(MF_SEPARATOR); zo\XuoZ
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?LNwr[C0
} oY.JK
} N(1jm F
SetIcon(m_hIcon, TRUE); // Set big icon a-QHm;_S
SetIcon(m_hIcon, FALSE); // Set small icon o@pM??&x
m_Key.SetCurSel(0); Rut6m5>
RegisterHotkey(); /
m?Z!
CMenu* pMenu=GetSystemMenu(FALSE); 0|GxOzNd
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uN`ACc)ESi
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *VRFs=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); X^xu$d6
return TRUE; // return TRUE unless you set the focus to a control 4El{2cfA
} Q?1 KxD!
O]2h=M@q.
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;[9cj&7C<
{ Y$Uvt_
if ((nID & 0xFFF0) == IDM_ABOUTBOX) },f7I^s|
{ >T!n* -Zn
CAboutDlg dlgAbout; -OkKLub
dlgAbout.DoModal(); s}?98?tYB
} 7Q[P
else WMUw5h
{ Ak}l6{ ..
CDialog::OnSysCommand(nID, lParam); `L;I/Hp
} 9L&AbmIr
} s{iYf :
K@>v|JD
void CCaptureDlg::OnPaint() <#R7sco'
{ +[F9Q,bH@b
if (IsIconic()) Hpsg[d)!
{ ;TW@{re
CPaintDC dc(this); // device context for painting ,2kWj7H%7
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); c"QH-sE
// Center icon in client rectangle *i$+i
int cxIcon = GetSystemMetrics(SM_CXICON); Gu_s:cgB9F
int cyIcon = GetSystemMetrics(SM_CYICON); Y":hb;&
CRect rect; :nXBw%0x
GetClientRect(&rect); `b% /.%]$
int x = (rect.Width() - cxIcon + 1) / 2; G&n_vwZ%
int y = (rect.Height() - cyIcon + 1) / 2; 2qn~A0r
// Draw the icon _`D_0v(X
dc.DrawIcon(x, y, m_hIcon); KM\`,1?x92
} F%Mlid;1
else GuS3O)6Sg
{ .OWIlT4K
CDialog::OnPaint(); Jp,ohVRNq
} Nm^q.)dO
} {_
1q`5o
W&p-Z"=)
HCURSOR CCaptureDlg::OnQueryDragIcon() j?8E >tM
{ _@RW7iP>
return (HCURSOR) m_hIcon; cdGl[dQ/
} 0 /H1INve
1zp,Suv
void CCaptureDlg::OnCancel() }h]:I'R!
{ 6 8_UQ.
if(bTray) )0'O!O
DeleteIcon(); {9=U6m^R2
CDialog::OnCancel(); Tw`l4S&
} Hv
IN'
p,1RRbyc
void CCaptureDlg::OnAbout() GdP9Uj)n-
{ tr'95'5W.
CAboutDlg dlg; mC93
&0
dlg.DoModal(); $L`7 J$'^
} ,~kMkBkl~
43VuH
void CCaptureDlg::OnBrowse() +V7p?iEY
{ BF@VgozW
CString str; B}!n6j`
BROWSEINFO bi; 97&6i TYA
char name[MAX_PATH]; |LjCtm)@+
ZeroMemory(&bi,sizeof(BROWSEINFO)); ca`=dwe>
bi.hwndOwner=GetSafeHwnd(); --/ .
bi.pszDisplayName=name; P]x@h
bi.lpszTitle="Select folder"; O;zW'*c+
bi.ulFlags=BIF_RETURNONLYFSDIRS; T-x`ut7c
LPITEMIDLIST idl=SHBrowseForFolder(&bi); qxrOfsh
if(idl==NULL) P$oa6`%l
return; ]O \6.>H
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); L_A|
str.ReleaseBuffer(); TfxKvol'
m_Path=str; 3)eeUO+
if(str.GetAt(str.GetLength()-1)!='\\') 6Q>w\@lF
m_Path+="\\"; oJR!0nQ
UpdateData(FALSE); ?O3G
} ~/Ry=8
+tA rH
C]
void CCaptureDlg::SaveBmp() 9wwvh'T&NK
{ ,onv
`
CDC dc; ~KNxAxyVi
dc.CreateDC("DISPLAY",NULL,NULL,NULL); E7D^6G&i
CBitmap bm; R.fRQ>rI
int Width=GetSystemMetrics(SM_CXSCREEN); . =+7H`A
int Height=GetSystemMetrics(SM_CYSCREEN); %8-S>'g'
bm.CreateCompatibleBitmap(&dc,Width,Height); C[s*Na-
CDC tdc; m7@`POI
tdc.CreateCompatibleDC(&dc); kOc'@;_O
CBitmap*pOld=tdc.SelectObject(&bm); A} "*`y
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <37vWK1+
tdc.SelectObject(pOld); SVpe^iQ]1\
BITMAP btm; q'@UZ$2
bm.GetBitmap(&btm); 9o18VJR
DWORD size=btm.bmWidthBytes*btm.bmHeight; lg=[cC2
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vSyN_ AB?$
BITMAPINFOHEADER bih; $C>EnNx
bih.biBitCount=btm.bmBitsPixel; 9Z* vp^3
bih.biClrImportant=0; !XicX9n
bih.biClrUsed=0; !hc7i=V?
bih.biCompression=0; - Z|1@s&
bih.biHeight=btm.bmHeight; f Xq e7[
bih.biPlanes=1; 61KJ(
rSX3
bih.biSize=sizeof(BITMAPINFOHEADER); }1>a 71
bih.biSizeImage=size; WU\):n
bih.biWidth=btm.bmWidth; \\T
I4A^#
bih.biXPelsPerMeter=0; p
2i5/Ly
bih.biYPelsPerMeter=0; OGVhb>LO1
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); T]myhNk
static int filecount=0; o4J K$%
CString name; %DN&K
name.Format("pict%04d.bmp",filecount++); zz9.OnZ~
name=m_Path+name; Vy?w,E0^:
BITMAPFILEHEADER bfh; 1ERz:\
bfh.bfReserved1=bfh.bfReserved2=0; WGO=@jkf
bfh.bfType=((WORD)('M'<< 8)|'B'); 6SmSu\lgV
bfh.bfSize=54+size; :[rx|9M6
bfh.bfOffBits=54; 'X?`+2wK
CFile bf; o+vf
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #A/jGv^
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~<eiWDf
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AD5t uY
bf.WriteHuge(lpData,size); \}2Wd`kD
bf.Close(); e (f)?H
nCount++; 6xOR,p>E
} z~W@`'f
GlobalFreePtr(lpData); -R8RAwsLG
if(nCount==1) Md~mI8
m_Number.Format("%d picture captured.",nCount); UxW>hbzr&V
else
78Gvc~j
m_Number.Format("%d pictures captured.",nCount); %iGME%oXr
UpdateData(FALSE); eMF%!qUr
} `b2I)xC#
j4l7Tx
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (I+-wki"e
{ IFE C_F>
if(pMsg -> message == WM_KEYDOWN) x;SrJVDN
{ s810714
if(pMsg -> wParam == VK_ESCAPE) *=
D$
return TRUE; E8nqExQ
if(pMsg -> wParam == VK_RETURN) kz&)a>aA
return TRUE; mI.*b(Irp
} @-m&X2J+c
return CDialog::PreTranslateMessage(pMsg); I?PKc'b
} GM%|mFqeu
z#\Z|OKU
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S38D
cWIw
{ G ;z2}Ei
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %mq]M
SaveBmp(); vSX
6~m
return FALSE; D"o>\Q
} 6>"0H/y,
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ n% *u;iG
CMenu pop; gC3{:MC-G
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ve.4""\a
CMenu*pMenu=pop.GetSubMenu(0); +F/ '+
pMenu->SetDefaultItem(ID_EXITICON); l5R H~F
CPoint pt; %'>. R
GetCursorPos(&pt); Wb|IWnH$
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); YgDgd\
if(id==ID_EXITICON) 1"'//0
7
DeleteIcon(); $v^F>*I1
else if(id==ID_EXIT) )O}x&@Q
OnCancel(); Gzs x0%`)
return FALSE; Rub"" Ga
} v-l):TL+=
LRESULT res= CDialog::WindowProc(message, wParam, lParam); a"v D+r7Ol
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dFUsQ_]<
AddIcon(); IOJ fv8
return res; FCIT+8K
} n8iN/Y<%U
mg;qG@?
void CCaptureDlg::AddIcon() 7Ua
Ll
{ & .#0jb1r
NOTIFYICONDATA data; a@ lK+t
data.cbSize=sizeof(NOTIFYICONDATA); 2`lit@u&u
CString tip; hA"N&v~
tip.LoadString(IDS_ICONTIP); ]y(#]Tw\
data.hIcon=GetIcon(0); "16==tLFE
data.hWnd=GetSafeHwnd(); "NJ!A
strcpy(data.szTip,tip); 8@r+)2
data.uCallbackMessage=IDM_SHELL; Og,,s{\
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; U,]z)1#X|
data.uID=98; 9 ROKueP
Shell_NotifyIcon(NIM_ADD,&data); ~MXPiZG?
ShowWindow(SW_HIDE); ,mRN;|N
bTray=TRUE; qH-dT,`"{
} ;hg]5r_
bT>^%
H3
void CCaptureDlg::DeleteIcon() CSD8?k]2
{ K=~h1qV:
NOTIFYICONDATA data; w,l1&=d
data.cbSize=sizeof(NOTIFYICONDATA); /fD)/x
data.hWnd=GetSafeHwnd(); r)b`3=
data.uID=98; 4];NX
Shell_NotifyIcon(NIM_DELETE,&data); h)YqC$A-s
ShowWindow(SW_SHOW); q<7Nz]Td
SetForegroundWindow(); wRuJein#
ShowWindow(SW_SHOWNORMAL); vI+PL(T@
bTray=FALSE; zX5p'8-
} d8x$NW-s
sQ`8L+oY
void CCaptureDlg::OnChange() VRxBi!d
{ Z|~<B4#c
RegisterHotkey(); p%G\5.GcJL
} Xu'u"amt
u?aq'
"t
BOOL CCaptureDlg::RegisterHotkey() B0YY7od
{ OixQlAb{
UpdateData(); Ck[Z(=b$$:
UCHAR mask=0; 9@S
icqx
UCHAR key=0; `j<'*v
zo
if(m_bControl) E-Mp|y /V
mask|=4; )ei+ewVZ
if(m_bAlt) *|4~
0w
mask|=2; K_My4>~Il
if(m_bShift) 7tyn?t0n
mask|=1; nVYh1@yLy
key=Key_Table[m_Key.GetCurSel()]; G q:7d]c~T
if(bRegistered){ )`U T#5
DeleteHotkey(GetSafeHwnd(),cKey,cMask); pZWp2hj{X
bRegistered=FALSE; .AV--oA~
} Tn-H8;Hg
cMask=mask; }we"IqLb
cKey=key; !867DX3*
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @@I2bHyvb
return bRegistered; jm*v0kNy
} a
@TAUJ,
a1GyI
四、小结 G&;W
+}:c+Z<
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。