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:
{e|[%reSkg
+\v?d&.f0 一、实现方法
,}K<*t[I [jmd 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:
bV,}Pp+/"! V+O"j^Z_J #pragma data_seg("shareddata")
9K1oZ?)_z HHOOK hHook =NULL; //钩子句柄
%2v4<icvq UINT nHookCount =0; //挂接的程序数目
,\NFt`]j static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
y*X_T,K8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
VkZ7# static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
nqLA}u4IM static int KeyCount =0;
}iuWAFZbGS static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
j_Yp>=+[ #pragma data_seg()
I_RsYw qgfi\/$6 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
o"*AtGR+" 812$`5l 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:
t. ;LnrY ~?(N BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
rS;Dmm cKey,UCHAR cMask)
F i0GknQ+ {
EAM5{Nc BOOL bAdded=FALSE;
I'LnI* for(int index=0;index<MAX_KEY;index++){
1')%`~ if(hCallWnd[index]==0){
'3g[]M@M hCallWnd[index]=hWnd;
"s{5O> HotKey[index]=cKey;
<u2 }i<# HotKeyMask[index]=cMask;
NU0g07" bAdded=TRUE;
F]<Xv" KeyCount++;
o_~eg8 break;
?nL.w }
d@qsdYu-* }
*6VF
$/rP return bAdded;
fZoHf\B]{ }
jbAx;Xt'=M //删除热键
OynXkH]0T+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<[-nF"Q {
pS:4CNI{ BOOL bRemoved=FALSE;
o,)?!{k} for(int index=0;index<MAX_KEY;index++){
#?S^kM-0 if(hCallWnd[index]==hWnd){
}9FSO9*&} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@<elq'2 hCallWnd[index]=NULL;
`7r@a HotKey[index]=0;
yPal<c HotKeyMask[index]=0;
3eF-8Z(f bRemoved=TRUE;
sc}~8T KeyCount--;
Sn|BlXrey break;
X<I+&Zi }
/#)/; }
xsD($_ }
Ck)*& return bRemoved;
s6@DGSJ }
ATK_DEAu 6}FP Jt}Bpg!J DLL中的钩子函数如下:
32`{7a3!= z62;cv LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
j3{D^|0bP {
yjF1}SQ BOOL bProcessed=FALSE;
7Mg=b%IYs if(HC_ACTION==nCode)
ci?qT,& {
0|{u{w@!` if((lParam&0xc0000000)==0xc0000000){// 有键松开
:qd`zG3 switch(wParam)
JPoN&BTCj {
~=uWD&5B4 case VK_MENU:
,Vt/(x- MaskBits&=~ALTBIT;
1ng!G 7g break;
?j"KV_ case VK_CONTROL:
?B2] -+Y MaskBits&=~CTRLBIT;
Gz,i~XX break;
{?:X8&Sf case VK_SHIFT:
Hl{S]]z MaskBits&=~SHIFTBIT;
iT2B'QI=< break;
J4fi' default: //judge the key and send message
,[P{HrHx break;
hpO`] }
[PNT\ElT for(int index=0;index<MAX_KEY;index++){
?#}N1k\S if(hCallWnd[index]==NULL)
=A83W/4 continue;
pHLB = r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hEKf6# {
Z{]0jhUyNh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
7$CBx/X50) bProcessed=TRUE;
HTX?,C_ }
Brf5dT49 }
PoG-Rqe }
XAF+0 x! else if((lParam&0xc000ffff)==1){ //有键按下
CxwoBuG=? switch(wParam)
< t,zaIi {
leTf&W case VK_MENU:
W\d{a(* MaskBits|=ALTBIT;
=THpdtL break;
fSK]|"c case VK_CONTROL:
JB<Sl4 MaskBits|=CTRLBIT;
um!J]N^ break;
Rh_np case VK_SHIFT:
O$_)G\\\m MaskBits|=SHIFTBIT;
]>=}*= break;
/|C* default: //judge the key and send message
-zOdU}91Ao break;
bk;?9%TW }
H[,i{dD for(int index=0;index<MAX_KEY;index++){
f4 P8Oz if(hCallWnd[index]==NULL)
I|gB@|_~ continue;
&$`P,i 1) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
F \KjEl0 {
bDL,S?@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
|H;F7Y_ bProcessed=TRUE;
Qz5sxi }
ZX9T YN }
J;.wXS_U8 }
4|riKo) if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
E8$20Ue for(int index=0;index<MAX_KEY;index++){
/Z'L^L%R if(hCallWnd[index]==NULL)
K|zZS%?$ continue;
6jE| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&Sw%<N*r SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
u0|8Tgf //lParam的意义可看MSDN中WM_KEYDOWN部分
}B\a<0L/ }
X' H[7 ^W }
RJ 8+h }
dCi?SIN return CallNextHookEx( hHook, nCode, wParam, lParam );
$'BSH4~|. }
I*{4rDt + jc!5i . 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:
Q=;U@k@> &"f"; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
n}F&1Z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3!XjtVhK?I $q6BP'7 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
7K,-01-: _x%7@.TB LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
y{ibO}s {
^1iSn)& if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
JEXy%hl {
l=S 35og //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
e6@=wnoX u SaveBmp();
re/@D@% return FALSE;
O#:$^#j& }
\F1_lq;K …… //其它处理及默认处理
WIC/AL' }
0^I|ut4 C7lH]`W|/ '\Giv!> 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。
{> eXR?s/ mn, =i 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。
}zkHJxZgE _<k\FU
r 二、编程步骤
dgR
g>)V {MtpkUN 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";
1C}NQ!. .k,1f*% 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
`Nz/Oh7 &]" 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;
")O%86_Q: [Y|8\Ph`& 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;
~ELNyI11 2`7==? 5、 添加代码,编译运行程序。
GPkmf%FJ 2D75:@JL}| 三、程序代码
xHL( !PF d"}k!
0m ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
-G}[AkmS #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
e@Fo^#ImDx #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
lD)%s! #if _MSC_VER > 1000
#pP[xE"Y #pragma once
R)_%i<nq\ #endif // _MSC_VER > 1000
fol,xMc& #ifndef __AFXWIN_H__
tNO-e|~' #error include 'stdafx.h' before including this file for PCH
HJLu'KY} #endif
M2PAy! J #include "resource.h" // main symbols
`NCwK6/i class CHookApp : public CWinApp
od IV:( {
d/PiiiFf, public:
x'+T/zw CHookApp();
|jI#"LbF // Overrides
3LAIl913 // ClassWizard generated virtual function overrides
o<|cA5f\ //{{AFX_VIRTUAL(CHookApp)
I8wXuIN_ public:
{@eJtF+2 virtual BOOL InitInstance();
1C<uz29 virtual int ExitInstance();
rSZd!OQ //}}AFX_VIRTUAL
'FqQzx"r //{{AFX_MSG(CHookApp)
Huy5-[)15 // NOTE - the ClassWizard will add and remove member functions here.
k.5u // DO NOT EDIT what you see in these blocks of generated code !
xQ}pu2@d //}}AFX_MSG
`z{%(_+[ DECLARE_MESSAGE_MAP()
)U~=Pf" };
pf1BN@
t LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
U &C!} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
VPO
N-{=` BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
C"6?bg5N BOOL InitHotkey();
zz+$=(T:M BOOL UnInit();
-m)X]]~C #endif
{_7i8c<s= &ib5*4! //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
fKeT,U`W #include "stdafx.h"
9{RB{<Se! #include "hook.h"
;T"zV{;7BR #include <windowsx.h>
&+cEV6vb+ #ifdef _DEBUG
^Y=\#-Dd #define new DEBUG_NEW
p2ogn}` #undef THIS_FILE
GC>e26\: static char THIS_FILE[] = __FILE__;
e5* ni/P #endif
cv?06x{ #define MAX_KEY 100
*AG#316 #define CTRLBIT 0x04
D ~stM #define ALTBIT 0x02
0rOfrTNOz% #define SHIFTBIT 0x01
p~SClaR3H #pragma data_seg("shareddata")
8cU}I4| HHOOK hHook =NULL;
4A8;tU$& UINT nHookCount =0;
% 5m/ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
\SN&G`o< static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Xnz3p" static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
w\(.3W7 static int KeyCount =0;
[h^2Y&Au5 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
I/a/)No #pragma data_seg()
nH`Q#ZFz]? HINSTANCE hins;
TV<'8L void VerifyWindow();
R%{a1r>9h BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Rtb7| //{{AFX_MSG_MAP(CHookApp)
K@sV\"U(*E // NOTE - the ClassWizard will add and remove mapping macros here.
,24p%KJ*X // DO NOT EDIT what you see in these blocks of generated code!
}@;ep&b* //}}AFX_MSG_MAP
q#T/
END_MESSAGE_MAP()
>64P6P;S uEktQ_u[ CHookApp::CHookApp()
+@94;me {
8"U. Hnu // TODO: add construction code here,
Fgp]l2* // Place all significant initialization in InitInstance
mp=z }
!D@ZYK; i&5XF CHookApp theApp;
H=g`hF]` LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
G+%zn| {
qT%FmX BOOL bProcessed=FALSE;
I$<<(VWH if(HC_ACTION==nCode)
CS@FYO {
T?x[C4wf+ if((lParam&0xc0000000)==0xc0000000){// Key up
8dO! switch(wParam)
=-8bsV/l {
;LG#.~f case VK_MENU:
*QwY]j%^ MaskBits&=~ALTBIT;
uW30ep' break;
.$qnZWcgG case VK_CONTROL:
<R''oEf9 MaskBits&=~CTRLBIT;
F$ #U5}Q break;
1`(tf6op case VK_SHIFT:
vd[}Gd MaskBits&=~SHIFTBIT;
jFASX2.p break;
S<VSn}vn default: //judge the key and send message
<J`0mVOX break;
g'H$R~ag }
G_0(
|% for(int index=0;index<MAX_KEY;index++){
n;@bLJ$W if(hCallWnd[index]==NULL)
fDT%! continue;
W8ouO+wK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`-(|>5wWS {
=T(6#" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
N>XS=2tzN bProcessed=TRUE;
$})g?Q }
r[BVvX/,F }
*1v[kWa? }
q=%RDG+ else if((lParam&0xc000ffff)==1){ //Key down
9;r)#3Q[^ switch(wParam)
hEBY8=gK {
]^lw*724'> case VK_MENU:
}% `.h" MaskBits|=ALTBIT;
A/u)# ^\ break;
zG ^$"f2 case VK_CONTROL:
P(H8[ , MaskBits|=CTRLBIT;
PcA2/!a break;
)TVFtI=,NN case VK_SHIFT:
mS~o?q-n MaskBits|=SHIFTBIT;
*v9 2 break;
d/BM&r default: //judge the key and send message
K
P Oa|$ break;
yf[~Yl>Ogw }
-=~| ."O for(int index=0;index<MAX_KEY;index++)
~$)2s7
O {
Pb1*\+ if(hCallWnd[index]==NULL)
VFRi1\G continue;
"JlpU-8[0@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
sE:M@`2L {
`%+Wz0(K SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
g/P+ZXJ bProcessed=TRUE;
-( }
bYEy<7)x }
iV&6nh( }
'}fzX2Q# if(!bProcessed){
)n2 re?S for(int index=0;index<MAX_KEY;index++){
%Z):>' if(hCallWnd[index]==NULL)
*=(lyx_O continue;
gDQ1?N'8{t if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9y<*8bI SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9~p[ }
c(!6^qk]!` }
]ooIrY8 }
)}"wesNo". return CallNextHookEx( hHook, nCode, wParam, lParam );
nQ5n-A&[" }
A-ZN F4 7UdM BOOL InitHotkey()
n/+.s(7c {
mj9 <%P if(hHook!=NULL){
+VO-oFE | nHookCount++;
L&u$t}~) return TRUE;
:I+Gu*0WD }
)N7Y^CN~ else
%-c*C $ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
hw=
Ft4L if(hHook!=NULL)
3HcQ(+Z nHookCount++;
nlW +.a[ return (hHook!=NULL);
7ccO93Mz }
KX'{[7}m' BOOL UnInit()
FB{KH . {
-OapVa c if(nHookCount>1){
;#vKi0V7 nHookCount--;
whi`Z:~ return TRUE;
23Nw!6S }
\$*7 >`k BOOL unhooked = UnhookWindowsHookEx(hHook);
]x(e&fyHB if(unhooked==TRUE){
|8My42yf nHookCount=0;
u~WVGjoQ hHook=NULL;
EfCx`3~EX }
Hn5|B 3vN return unhooked;
@d
mV }
Exc9`
7%. va}Pj#= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
r76J
N {
@ycDCB(D} BOOL bAdded=FALSE;
??M"6k for(int index=0;index<MAX_KEY;index++){
j4|N-: if(hCallWnd[index]==0){
Kx;eaz:gx hCallWnd[index]=hWnd;
)qo {c1X HotKey[index]=cKey;
d@XV:ae HotKeyMask[index]=cMask;
+trC,D bAdded=TRUE;
+
HK8jCa KeyCount++;
i36eBjT break;
SL#0kc0x }
hc>HQrd }
&jslyQ# return bAdded;
mID"^NOi# }
3?V_BUoON c'%-jG)\ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
SYCEQ5
- {
_B/dWA,P BOOL bRemoved=FALSE;
>z%&xgOa for(int index=0;index<MAX_KEY;index++){
f!I[>&n if(hCallWnd[index]==hWnd){
psg)*'r if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>8WP0Qx/ hCallWnd[index]=NULL;
]:4*L HotKey[index]=0;
g#Sl %Y HotKeyMask[index]=0;
8FKXSqhVM bRemoved=TRUE;
zgNc4B KeyCount--;
zNxW'?0Z? break;
c:<005\Bg }
;<Ar=? }
9x>d[-#y:J }
-likj#Z return bRemoved;
y\Ic@-aWI }
m[~V/N3 Xejo_SV&? void VerifyWindow()
>qS9PX {
5-aj2>=7 for(int i=0;i<MAX_KEY;i++){
x[h^[oF0 if(hCallWnd
!=NULL){ ts\5uiB<%
if(!IsWindow(hCallWnd)){ MZSy6v
hCallWnd=NULL; \;qW 3~
HotKey=0; i;/5Y'KZ
HotKeyMask=0; 3RYpJAH
KeyCount--; u%}nw :>
} e1%/26\
} 5*l T.
} [N7{WSZ&
} )Im#dVQs=
bM {s
T"
BOOL CHookApp::InitInstance() 6-z%633DL
{ xTj|dza
AFX_MANAGE_STATE(AfxGetStaticModuleState()); =e9>FWf>
hins=AfxGetInstanceHandle(); v!<gY
m&
InitHotkey(); ]s'Q_wh_-v
return CWinApp::InitInstance(); yeXx',]a
} A
mNW0.}
#gRM i)(F
int CHookApp::ExitInstance() l_o@miG/
{ *5%d XixN
VerifyWindow(); =Je[c,&j$?
UnInit(); tnH2sHby
return CWinApp::ExitInstance(); $*e2YQdLo
} B*
?]H*K
fI&t]
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file U>]$a71
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _I@9HC 4
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9^oKtkoDZ
#if _MSC_VER > 1000 yXSFjcoB
#pragma once =/s>Q l
#endif // _MSC_VER > 1000 s/$?^qtyC
qh9Z50E9
class CCaptureDlg : public CDialog WI-&x
'
{ % tS,}ze
// Construction j[`j9mM8
public: w>pq+og&
BOOL bTray; \-h%O
jf4
BOOL bRegistered; `uOT+B%R
BOOL RegisterHotkey(); F*IzQ(#HW
UCHAR cKey; >AVVEv18
UCHAR cMask; t;W0"ci9
void DeleteIcon(); \.MR""@y`{
void AddIcon(); yv t.
UINT nCount; ]A~WIF
void SaveBmp(); [<n2Uz7MP
CCaptureDlg(CWnd* pParent = NULL); // standard constructor (}Z@R#njH
// Dialog Data /rWd=~[MO
//{{AFX_DATA(CCaptureDlg) 3{'Ne}5%I
enum { IDD = IDD_CAPTURE_DIALOG }; 5rw 7;'
CComboBox m_Key; A)bWcB}U
BOOL m_bControl; Y<N5#
);f
BOOL m_bAlt; 01wX `"I
BOOL m_bShift; mk.9OhYY
CString m_Path; uatm/o^~,
CString m_Number; l4F%VR4KT
//}}AFX_DATA 2BQ
j
// ClassWizard generated virtual function overrides !%CWZZ 6u
//{{AFX_VIRTUAL(CCaptureDlg) e7^mmm
public: ~xkeuU
virtual BOOL PreTranslateMessage(MSG* pMsg); )eUh=eW
protected: &XIt5<$~R
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E{XH?_xo
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); kZR8a(4D
//}}AFX_VIRTUAL HVi'eNgo
// Implementation pmuvg6@h
protected:
~ksi</s
HICON m_hIcon; KaPAa:Q
// Generated message map functions :flx6,7D
//{{AFX_MSG(CCaptureDlg) @i2E\}
virtual BOOL OnInitDialog(); CDsSrKhx
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )(bW#-
afx_msg void OnPaint(); <c2E'U)X
afx_msg HCURSOR OnQueryDragIcon(); j'Gt&\4
virtual void OnCancel(); PQy4{0 _
afx_msg void OnAbout(); -.1y(k^4E
afx_msg void OnBrowse(); '*K :
lx
afx_msg void OnChange(); 3eb%OEMYk
//}}AFX_MSG Si_ _8D
DECLARE_MESSAGE_MAP() Z"/p,A9W9|
}; uZNTHD
#endif `g(Y*uCp
U;YC}r
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file
[$mHv,~
#include "stdafx.h" /KFfU1
#include "Capture.h" <CS(c|7
#include "CaptureDlg.h" l{5IUuUi
#include <windowsx.h> "sS}N%!
#pragma comment(lib,"hook.lib") 1Ir21un
#ifdef _DEBUG k
Z?=AXu
#define new DEBUG_NEW F^WP <0C
#undef THIS_FILE abuh`H#
static char THIS_FILE[] = __FILE__; fY{1F
#endif
9Vg?{v!yn
#define IDM_SHELL WM_USER+1 ;y,5k?
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K*%9)hq
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PY{
G [
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WA5 kg\
class CAboutDlg : public CDialog /NLui@|R
{ h{CL{>d
public: +[M6X}
TQ
CAboutDlg(); 52%2R]G!
// Dialog Data vmU@^2JSJ
//{{AFX_DATA(CAboutDlg) Z?6%;n^ 54
enum { IDD = IDD_ABOUTBOX }; @3) (BpFe
//}}AFX_DATA qyZ"
%Kz
// ClassWizard generated virtual function overrides |t^E~HLm,
//{{AFX_VIRTUAL(CAboutDlg) .k#U]M
protected: >=qf/K+#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @Pm>sY}d<I
//}}AFX_VIRTUAL xe]y]
// Implementation ap.K=-H
protected: b LB:MW\%
//{{AFX_MSG(CAboutDlg) vUN22;Z\
//}}AFX_MSG bfFeBBi
DECLARE_MESSAGE_MAP() zZ7;jyD
}; b+%f+zz*h
3_ r*y9l
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) J*r*X.
{ -f3p U:G8
//{{AFX_DATA_INIT(CAboutDlg) w{Ivmdto
//}}AFX_DATA_INIT *T-<|zQ
} VQ(j pns5
C;;Sih5
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c?tBi9'Y]
{ VyXKZ%\dQ/
CDialog::DoDataExchange(pDX); _G[g;$<
//{{AFX_DATA_MAP(CAboutDlg) /sUYU(3
//}}AFX_DATA_MAP AS!?q
} >W%EmnLK
{ME2ImD
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rxe>}ZO
//{{AFX_MSG_MAP(CAboutDlg)
zkt+7,vI
// No message handlers zvvhFN2s
//}}AFX_MSG_MAP $ZUdT
END_MESSAGE_MAP() 18|m)(W
'<jyw
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) u#Pa7_zBj]
: CDialog(CCaptureDlg::IDD, pParent) srr
:!5
{ |v`AA?@{8
//{{AFX_DATA_INIT(CCaptureDlg) \MsTB|Z
m_bControl = FALSE; Umz KY
m_bAlt = FALSE; <5-[{Q/2z
m_bShift = FALSE; %<)2/|lCd
m_Path = _T("c:\\"); -Y1e8H ='
m_Number = _T("0 picture captured."); Z)e/!~""]
nCount=0; i/65v
bRegistered=FALSE; A^nvp!_
bTray=FALSE; t=(!\:[D
//}}AFX_DATA_INIT c-x,fS"&W
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 61,;Uc\T
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?274uAO'
} ]jtK I4
J}*,HT *
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) qaqBOHI6G
{ &x=.$76
CDialog::DoDataExchange(pDX); F<ZYh
//{{AFX_DATA_MAP(CCaptureDlg) =qoWCmg"&
DDX_Control(pDX, IDC_KEY, m_Key); ls?~+\Jb
DDX_Check(pDX, IDC_CONTROL, m_bControl); 3oBtP<yG.
DDX_Check(pDX, IDC_ALT, m_bAlt); 0QBiC]9
DDX_Check(pDX, IDC_SHIFT, m_bShift); 6|K5!2
DDX_Text(pDX, IDC_PATH, m_Path);
d:_t-ZZo
DDX_Text(pDX, IDC_NUMBER, m_Number); 3YeG$^y"
//}}AFX_DATA_MAP P!$Zx)T
}
H_B4
qPWP&k
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P#E &|n7DT
//{{AFX_MSG_MAP(CCaptureDlg) Yab%/z2:
ON_WM_SYSCOMMAND() _A M*@|p,
ON_WM_PAINT() l3KVW5-!gS
ON_WM_QUERYDRAGICON() xVf|G_5$
ON_BN_CLICKED(ID_ABOUT, OnAbout) 6 +Sxr
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) z
F_M*8=
ON_BN_CLICKED(ID_CHANGE, OnChange) Kc!}`Pm
//}}AFX_MSG_MAP }wWKFX
END_MESSAGE_MAP() QgrpBG
\n" {qfn`r
BOOL CCaptureDlg::OnInitDialog() j>*S5y.{
{ b}OY4~ Y4
CDialog::OnInitDialog(); ~9?cn
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Av @b!iw+
ASSERT(IDM_ABOUTBOX < 0xF000); Y_Eb'*PY
CMenu* pSysMenu = GetSystemMenu(FALSE); d4m=0G`
if (pSysMenu != NULL) .0p0_f=
{ ZWii)0'PV
CString strAboutMenu; *w$W2I>b7
strAboutMenu.LoadString(IDS_ABOUTBOX); w:??h4lt
if (!strAboutMenu.IsEmpty()) IW)()*8;/
{ ~{?_p@&n
pSysMenu->AppendMenu(MF_SEPARATOR); /Y*WBTV'
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7@#>bE6
} S_iMVHe
} )r';lGh2#
SetIcon(m_hIcon, TRUE); // Set big icon "C?#SO
B
SetIcon(m_hIcon, FALSE); // Set small icon A]y`7jJ
m_Key.SetCurSel(0); T\:4qETQF]
RegisterHotkey(); 7@C<oy_bb
CMenu* pMenu=GetSystemMenu(FALSE); x9NEFtqjm
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ".f ;+wH
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xpNH?#&
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G=)i{oC
return TRUE; // return TRUE unless you set the focus to a control +QB"8-
} IWBX'|}K
> pgX^
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9 ^o-EC!_
{ ;1#H62Z*
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6~OoFm5
{ bf0+DvIB
CAboutDlg dlgAbout; )Z[ft
dlgAbout.DoModal(); ~Xr=4V:a+
} W"724fwu&
else 5&xB6|k
{ =6xrfDbN8
CDialog::OnSysCommand(nID, lParam); &vHoRY
} w|3z;-#Q;
} L%">iQOG#
Ytgcs(
/$
void CCaptureDlg::OnPaint() $r@
=*(
{ R[Ll59-
if (IsIconic()) :#2Bw]z&z
{ eeIhed9
CPaintDC dc(this); // device context for painting [vge56h
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); U
-Y03
// Center icon in client rectangle AUeu1(
int cxIcon = GetSystemMetrics(SM_CXICON); ;V@WtZv
int cyIcon = GetSystemMetrics(SM_CYICON); %lL.[8r|
CRect rect; ]d55m /(
GetClientRect(&rect); !P ~_Dl2d
int x = (rect.Width() - cxIcon + 1) / 2; EQ2#/>
int y = (rect.Height() - cyIcon + 1) / 2; PiY Y6i0
// Draw the icon 6\L0mcXR!
dc.DrawIcon(x, y, m_hIcon); z25lZI" X`
} %?LOs
H
else aGK?x1_
{ @*>@AFnf\Z
CDialog::OnPaint(); #btLa\HJ
} 0fc/wfv<
} 0?sRDYaX;c
aHlcfh9|
HCURSOR CCaptureDlg::OnQueryDragIcon()
rL/H2[d
{ |]QqXE-7
return (HCURSOR) m_hIcon; Mc#*wEo)8
} _,q) hOI
)iq-yjO6
void CCaptureDlg::OnCancel() j0Bu-sO$w
{ W8Q|$ZJ88F
if(bTray) iM2W]
DeleteIcon(); wNq;;AJ$
CDialog::OnCancel(); &lR 6sb\
} L}GC<D:
XXbqQhf
void CCaptureDlg::OnAbout() ag$Vgl
{ .b\$MZ"(
CAboutDlg dlg; 8iW;y2qF
dlg.DoModal(); nYWvTvZ
} Z -,J)gW
0 - ><q
void CCaptureDlg::OnBrowse() pkP?i5,
{ e'~Zo9`r6
CString str; 5'0xz.)!
BROWSEINFO bi; X_qf"|i
char name[MAX_PATH]; g wz7krUTe
ZeroMemory(&bi,sizeof(BROWSEINFO)); [qdRUV'
bi.hwndOwner=GetSafeHwnd(); ~jK{ ,$:=
bi.pszDisplayName=name; t(GR)&>.2
bi.lpszTitle="Select folder"; pp.6Ex
(R
bi.ulFlags=BIF_RETURNONLYFSDIRS; 6)z?f4,
LPITEMIDLIST idl=SHBrowseForFolder(&bi); GGe,fb<k
if(idl==NULL) ;?W|#*=R
return; H1I{/g
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (&&4J{`W9
str.ReleaseBuffer(); J%V-Q>L
m_Path=str; XEC(P
if(str.GetAt(str.GetLength()-1)!='\\') Av?2<
m_Path+="\\"; yvgrIdEP
UpdateData(FALSE); )Y]{HQd
} !(qsD+
t^`O{m<
void CCaptureDlg::SaveBmp() 6``'%S'#
{ z?>D_NLX6
CDC dc; :1 (p.q=
dc.CreateDC("DISPLAY",NULL,NULL,NULL); $|]" W=h
CBitmap bm; e`d%-9
int Width=GetSystemMetrics(SM_CXSCREEN); D6CS8
~"
int Height=GetSystemMetrics(SM_CYSCREEN); cHcmgW\4
bm.CreateCompatibleBitmap(&dc,Width,Height); T_X6Ulp
CDC tdc; mK[)mC
_8
tdc.CreateCompatibleDC(&dc); Qhs/E`k4
CBitmap*pOld=tdc.SelectObject(&bm); I6j$X 6u
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,QC{3i~
tdc.SelectObject(pOld); XGJj3-eW{
BITMAP btm; 76wc ,+
bm.GetBitmap(&btm); Vm5c+;
DWORD size=btm.bmWidthBytes*btm.bmHeight; m~@;~7I x
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (
xXGSx
BITMAPINFOHEADER bih; [~kdPk
bih.biBitCount=btm.bmBitsPixel; ZeUvyIG
bih.biClrImportant=0; Au{<hQ =
bih.biClrUsed=0; 3 N7[.I>A
bih.biCompression=0; I/M _p^
bih.biHeight=btm.bmHeight; 9Q(+ZG=JkV
bih.biPlanes=1; WX}xmtLs
bih.biSize=sizeof(BITMAPINFOHEADER); 90|7ArM_[
bih.biSizeImage=size; g8Q5m=O*
bih.biWidth=btm.bmWidth; 5nTY ?<x`k
bih.biXPelsPerMeter=0;
?6L&WB
bih.biYPelsPerMeter=0; ^zE wA
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0VckocF
static int filecount=0; *.~6S3}
CString name; W?0 lV5/
name.Format("pict%04d.bmp",filecount++); "Vw m
name=m_Path+name; +E1I");
BITMAPFILEHEADER bfh; 4J;-Dq
bfh.bfReserved1=bfh.bfReserved2=0; "jTKSgv+q5
bfh.bfType=((WORD)('M'<< 8)|'B'); N2oRJ,:B
bfh.bfSize=54+size; u5 {JQO
bfh.bfOffBits=54; $U$V?xuE
CFile bf; Q:|l`*.R
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %FS$zOsgGK
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Eo\UAc
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !(n4|Wd
bf.WriteHuge(lpData,size); Mva3+T
bf.Close(); #6AFdNy
nCount++; txZ?=8j_Y
} hq:&wN7Q
GlobalFreePtr(lpData); )I^2k4Cg"
if(nCount==1) t~E<j+<2B
m_Number.Format("%d picture captured.",nCount); s[K^9wz
else 4Ue_Y'LmM
m_Number.Format("%d pictures captured.",nCount); q}/WQ]p} <
UpdateData(FALSE); j4>a(
} s:2|c]wQ#R
#'-Sh7ycW
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !@x+q)2
{ yfjK2
if(pMsg -> message == WM_KEYDOWN) kloR#?8A
{ :Gu+m
if(pMsg -> wParam == VK_ESCAPE) QV h4
return TRUE; KjFK/Og.
if(pMsg -> wParam == VK_RETURN) bn(`O1r[(
return TRUE; DNR~_3Aq
} ZT[3aXS
return CDialog::PreTranslateMessage(pMsg); 3#vinz
} >6~k9>nDb<
?9HhG?_x
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J0
k
{ zVi15P$
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KJ?y@Q
SaveBmp(); Fhv2V,nZ<
return FALSE; 7_wJpTz
} u>Rb
?`
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v}sY|p"
CMenu pop; iJv48#'ii
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); '`|AI:L
CMenu*pMenu=pop.GetSubMenu(0); F,GN[f-
pMenu->SetDefaultItem(ID_EXITICON); =(EI~N
CPoint pt; X53mzs
GetCursorPos(&pt); x$wd
O
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); b$Hz3TJ(
if(id==ID_EXITICON) ?sBh=Ds
DeleteIcon(); .}k(L4T|=
else if(id==ID_EXIT) Um)>2|rp}
OnCancel(); 6 CC &Z>
return FALSE; X 6lH|R
} T*I?9d{k
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1`LXz3uBe
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "o&HE@t
AddIcon(); ?\/qeGW6G
return res; b?Pj< tA
} kvGCbRC
h{}mBQl
void CCaptureDlg::AddIcon() 1/ZR*fa
{ Sd))vS^g
NOTIFYICONDATA data; T#!lPH :&h
data.cbSize=sizeof(NOTIFYICONDATA); (X +s-4%
CString tip; V8-h%|$p3W
tip.LoadString(IDS_ICONTIP); >p])it[q&$
data.hIcon=GetIcon(0); mxFn7.|r~
data.hWnd=GetSafeHwnd(); w%c
strcpy(data.szTip,tip); -6=<#9R
data.uCallbackMessage=IDM_SHELL; 8BXqZVm.
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; I,ci >/+b
data.uID=98; ~%#mK:+
Shell_NotifyIcon(NIM_ADD,&data); wU`!B<,j
ShowWindow(SW_HIDE); 7S$&S;
bTray=TRUE; *zVvQ=
} 8[bkHfI
*Q}[ ]g
void CCaptureDlg::DeleteIcon() K(T\9J.
{ E1Q0k5@
NOTIFYICONDATA data; ~2uh'e3
data.cbSize=sizeof(NOTIFYICONDATA); gJ3c;
data.hWnd=GetSafeHwnd(); Di Or{)a
data.uID=98; XTqm]
Shell_NotifyIcon(NIM_DELETE,&data); F6S~$<
ShowWindow(SW_SHOW); !:fv>FEI9
SetForegroundWindow(); $v}<'
ShowWindow(SW_SHOWNORMAL); ?M6ag_h3
bTray=FALSE; _qWC4NMF(
} {<w
+3Va
q]<xMg#nu
void CCaptureDlg::OnChange() ,
fb(
WY
{ N
dR ]
RegisterHotkey(); r$nkU4N'
} dEp/dd~(&
TYjA:d9YH
BOOL CCaptureDlg::RegisterHotkey() kJ=L2g>W<.
{ 3gfimD$ _E
UpdateData(); X)uDSI~
UCHAR mask=0; q42FPq
UCHAR key=0; ua
8m;>R
if(m_bControl) FUeq
\Wuo
mask|=4; *+lsZ8'^C
if(m_bAlt) gs`^~iD]m
mask|=2; ~%y\@x7I
if(m_bShift) Pg^h,2h
mask|=1; }X$l\pm
key=Key_Table[m_Key.GetCurSel()]; fk5XvL
if(bRegistered){ A%ywj'|z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); *,#q'!Hq
bRegistered=FALSE; I ftxSaP
} +T_ p8W+j
cMask=mask; o;J;*~g
cKey=key; [{F%LRCo-
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (;6s)z
return bRegistered; :%_q[}e
} HdQj?f3
Li`hdrO'ii
四、小结 ]TK=>;&
3n(*E_n
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。