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:
SGKAx<U
xOkdu k] 一、实现方法
O/eZ1YAC ?;tPqOs& 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:
z$&B7? |5flvkid #pragma data_seg("shareddata")
>33=0< HHOOK hHook =NULL; //钩子句柄
_`gF%$]b UINT nHookCount =0; //挂接的程序数目
Mmz;
uy_ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
T#*,ME7|m static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
fTEZ@#p static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Mnranhe>G static int KeyCount =0;
hp -|a static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
A^aY-V #pragma data_seg()
C).\ J ! inW7t2p<s 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。
F
w{:shC ]v<8l4p; 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:
hT%fM3|,e 8i;1JA BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
&l cfX\y cKey,UCHAR cMask)
vapC5,W"2- {
C-edQWbcP BOOL bAdded=FALSE;
.5 E)dU for(int index=0;index<MAX_KEY;index++){
ue8 @=} if(hCallWnd[index]==0){
)Q1aAS3 hCallWnd[index]=hWnd;
*o1US HotKey[index]=cKey;
>|S@twy HotKeyMask[index]=cMask;
pCkMm)2g! bAdded=TRUE;
4$^mLD$> KeyCount++;
U_VP\ 03 break;
F,vkk{Z> }
@*rMMy 4 }
?Nt( sZ- return bAdded;
pnu?=.O }
N:|``n> //删除热键
\(LD<-a BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
fDYTupKXH {
]DnAW'm BOOL bRemoved=FALSE;
O#.YTTj for(int index=0;index<MAX_KEY;index++){
=?|$}vDO[ if(hCallWnd[index]==hWnd){
pbKmFweq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(pH)QG hCallWnd[index]=NULL;
{n>.Y-= HotKey[index]=0;
8`S1E0s HotKeyMask[index]=0;
ksq4t bRemoved=TRUE;
n\;;T1rM KeyCount--;
pYcs4f!?p break;
.?:#<=1 }
Q>L(=j2t }
hV $Zr4' }
/- Gq`9Z return bRemoved;
]$#bNt/p }
,~7~ S" 0Fkr3x '-myOM7 DLL中的钩子函数如下:
6}Y==GPt [!U%'' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
H%vgPQ8 {
6,4vs+(|\ BOOL bProcessed=FALSE;
Wpf~Ji6|| if(HC_ACTION==nCode)
I3
6@x`f {
5ppr;QaB if((lParam&0xc0000000)==0xc0000000){// 有键松开
,i6U* switch(wParam)
QcWg {
@@@}FV& case VK_MENU:
!{,2uQXe MaskBits&=~ALTBIT;
>Ec;6V
e break;
?9xWTVa8 case VK_CONTROL:
0(o2<d7 MaskBits&=~CTRLBIT;
J#:`'eEG break;
V9/2y9u case VK_SHIFT:
,#N}Ni: MaskBits&=~SHIFTBIT;
~NE`Ad.G break;
6
JI8l`S default: //judge the key and send message
;a|%W4 " break;
0++RxYFCL }
`Cd! for(int index=0;index<MAX_KEY;index++){
)
YB'W_ if(hCallWnd[index]==NULL)
Q|[^dju continue;
}!xc@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
MMO/vJC {
WUauKRR. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
%>/&&(BE bProcessed=TRUE;
xjD$i'V+ }
K:e[#b8:R }
S*n5d >; }
5(2 C else if((lParam&0xc000ffff)==1){ //有键按下
Tcv/EST switch(wParam)
{li
Q&AZ {
AaU!a case VK_MENU:
|L89yjhWBs MaskBits|=ALTBIT;
pFs/ipZX^* break;
,2 xD>+= case VK_CONTROL:
t"9r`0> MaskBits|=CTRLBIT;
+9]t]Vrw break;
i{9.bpp/ case VK_SHIFT:
Mq\?J{E MaskBits|=SHIFTBIT;
\0Xq&CG=E break;
#'@@P6o5 default: //judge the key and send message
2f{p$YIt break;
]w,|WZm }
vH}VieU for(int index=0;index<MAX_KEY;index++){
5GPrZY" if(hCallWnd[index]==NULL)
S@[NKY continue;
8B+C[Q:+' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
uEhPO {
hKhad8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ajG_t bProcessed=TRUE;
!yi*Zt~ }
\PZ;y=]p} }
e34g=]" }
pub?% if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+BM[@?"hrh for(int index=0;index<MAX_KEY;index++){
b7+(g[O if(hCallWnd[index]==NULL)
N,8.W"fV continue;
+_ 8BJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{|0YcL SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9*~";{O.Oa //lParam的意义可看MSDN中WM_KEYDOWN部分
*yHz#u' }
C \5yo }
nxEC6Vh' }
f fI=Bt]t return CallNextHookEx( hHook, nCode, wParam, lParam );
d%L/[.& }
2zbn8tO J!|R1 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:
InRRcn( =/xx:D/ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
mm*nXJ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`tuGy}S2
U)iBeYW: 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:
.i )n1 E:uTjXt LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
yW*,Llb5 {
vV=rBO0a? if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Piw i {
GBBp1i
//lParam表示是按下还是松开,如果有多个热键,由wParam来区分
ru/{s3 SaveBmp();
KR R)pT return FALSE;
z[vu-f9 }
*Jt+-ZM …… //其它处理及默认处理
LEN=pqGJ. }
3me&isKL 6~>h;wC 2B)1
tP 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。
.F%jbnKd_ <Mj{pN3 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。
NU'2QSU8 \R-'<kN.* 二、编程步骤
JSylQ201 {md5G$*% 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
MLiaCG; hhWy-fP#
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
\QG2V$ }G^'y8U 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;
m$hkmD| wSM(!:on5 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
?I+$KjE+ 6Hy_7\$(- 5、 添加代码,编译运行程序。
L?M
x"
e]dFNunFq0 三、程序代码
Nw"?~"bo ;;C2t&( ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
uvR l`"Y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
*c%{b3T_ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Hj `\Fm*A #if _MSC_VER > 1000
g-ZXj4Ph! #pragma once
V_e #endif // _MSC_VER > 1000
RU/SJ1wM" #ifndef __AFXWIN_H__
I#]pk! #error include 'stdafx.h' before including this file for PCH
6f
t6;*, #endif
>Y\?v-^~; #include "resource.h" // main symbols
OwNo$b]h` class CHookApp : public CWinApp
f<oU"WM {
Vo.~1^ public:
rR/{Yx4 CHookApp();
9@mvG^ // Overrides
C CLc,r>) // ClassWizard generated virtual function overrides
UUvCi+W //{{AFX_VIRTUAL(CHookApp)
bVa?yWb. public:
.kkhW8: virtual BOOL InitInstance();
/2*BdE[yG virtual int ExitInstance();
|TQ4:P1T //}}AFX_VIRTUAL
cf^ i!X0 //{{AFX_MSG(CHookApp)
U9Ea}aN // NOTE - the ClassWizard will add and remove member functions here.
M
'%zA;Wl // DO NOT EDIT what you see in these blocks of generated code !
^ rUq{ //}}AFX_MSG
J,=ZUh@M DECLARE_MESSAGE_MAP()
1U^KN~! };
0S&J=2D! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
mfffOG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
E.0J94>iM BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Jf#-OlEQ BOOL InitHotkey();
0V8 6]zSo BOOL UnInit();
paMK]- #endif
rz`"$g+# Lm<WT*@ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
VfDa>zV3 #include "stdafx.h"
zMO#CZ t #include "hook.h"
;|$o z{Ll #include <windowsx.h>
'n\P S,[1R #ifdef _DEBUG
Hr7pcz/#l #define new DEBUG_NEW
mb%U~Na #undef THIS_FILE
=}I=s@ static char THIS_FILE[] = __FILE__;
QoxQ"r9Wh #endif
MR5[|kHJT #define MAX_KEY 100
'{.8tT?tJ #define CTRLBIT 0x04
C(8!("tU #define ALTBIT 0x02
1;B&R89} #define SHIFTBIT 0x01
Bc-/s(/Eq #pragma data_seg("shareddata")
kkMChe};5 HHOOK hHook =NULL;
m6}_kzFz UINT nHookCount =0;
@[f$MRp\ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
3` D[' static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
N_Zd.VnY static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
%~>-nqS static int KeyCount =0;
4M6[5RAW{ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
w-NTw2x,& #pragma data_seg()
Tdz#,]Q HINSTANCE hins;
5DkEJk7a void VerifyWindow();
"3a}~J<g BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
?|
6sTu! //{{AFX_MSG_MAP(CHookApp)
-okq=9 // NOTE - the ClassWizard will add and remove mapping macros here.
*DZ7,$LQ~D // DO NOT EDIT what you see in these blocks of generated code!
\}Iq-Je //}}AFX_MSG_MAP
D,lY_6= END_MESSAGE_MAP()
5Fj9.K~k Dbq/t^ CHookApp::CHookApp()
Zw'050~- {
8$Zwk7 w8A // TODO: add construction code here,
=w"Kkj>%oh // Place all significant initialization in InitInstance
/;[x3}[ }
Q7d@+C <%rm?;PBl CHookApp theApp;
G$QN_h,} LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
BgDWl{pm {
x%[NK[^& BOOL bProcessed=FALSE;
hsYE&Np_Q if(HC_ACTION==nCode)
FgrVXb_q {
Je2&7uR0 if((lParam&0xc0000000)==0xc0000000){// Key up
XJy.xI>; switch(wParam)
0_Elxc {
ukc
7Z
OQ case VK_MENU:
Tow! 5VAM MaskBits&=~ALTBIT;
~_F;>N~ break;
T(]*jaB case VK_CONTROL:
xdz 6[8d8 MaskBits&=~CTRLBIT;
l%?4L/J)# break;
R?2HnJh case VK_SHIFT:
4PkKL/E MaskBits&=~SHIFTBIT;
BSJS4+,E break;
^SsnCn-e default: //judge the key and send message
x
ju*zmu break;
G K3T w }
kg7bZ for(int index=0;index<MAX_KEY;index++){
KK6z3"tk5 if(hCallWnd[index]==NULL)
>msQ@Ch continue;
)54a' Hp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C~"UOFX {
2i
!\H$u` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~F-lO1 bProcessed=TRUE;
SXO.|"M }
I3'UrKKO }
ZitmvcMk }
~ISY( & else if((lParam&0xc000ffff)==1){ //Key down
:xbj&
l switch(wParam)
=YfzB!ld {
j(K)CHH case VK_MENU:
FUJ<gqL MaskBits|=ALTBIT;
rwio>4= break;
$/@
L case VK_CONTROL:
!y>up+cRjl MaskBits|=CTRLBIT;
4i}nk
T break;
q4G$I?4 case VK_SHIFT:
vW!O("\7K< MaskBits|=SHIFTBIT;
W,H=K##6< break;
'Nuy/\[{\ default: //judge the key and send message
P{:Z xli0 break;
w:iMrQeJg }
r ?<kWR?w for(int index=0;index<MAX_KEY;index++)
Gr)G-zE {
\&ZEIAe if(hCallWnd[index]==NULL)
ka ;=%*7T continue;
JRZp'Ln if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
D]rYg' {
q8;MPXSG3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4`fV_H.8 bProcessed=TRUE;
k'PvQl"I }
a^E>LJL }
Sl'$w4s
}
~-uf%= if(!bProcessed){
^6F, lS _t for(int index=0;index<MAX_KEY;index++){
.XRe:\8mc if(hCallWnd[index]==NULL)
i_l{#*t continue;
Gm9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9ZatlI, SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
v6[VdWOx5 }
fo`R=|L[ }
, /jHhKW }
5JK'2J& return CallNextHookEx( hHook, nCode, wParam, lParam );
|cp_V }
a#[gNT~[ LpSF*xm BOOL InitHotkey()
}|N88PN {
"!7Hu7 if(hHook!=NULL){
L+T7Ge
q nHookCount++;
"L1LL
iS return TRUE;
?TIi0;h }
55UPd#E' else
K :+q9;g hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Bt5 P][< if(hHook!=NULL)
WPlf8* -fQ nHookCount++;
7ncR2-{g return (hHook!=NULL);
pR=R{=}wV }
&)JoB BOOL UnInit()
\*qradgx$ {
NjA[(8\: if(nHookCount>1){
0R`>F"> nHookCount--;
MU2kA&LH return TRUE;
I>vU;xV\m }
0dS (g&ZR BOOL unhooked = UnhookWindowsHookEx(hHook);
?m7i7Dz
if(unhooked==TRUE){
2G!z/OAj nHookCount=0;
H"k\(SPVS hHook=NULL;
4g}r+!T }
92.Rjz;=9? return unhooked;
eT5IL(mH }
8g-Z~~0W1 v<)&JlR BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C.LAr~P {
M5d EZ BOOL bAdded=FALSE;
{D(l#;,iX2 for(int index=0;index<MAX_KEY;index++){
Qt_KUtD if(hCallWnd[index]==0){
ad47 42 hCallWnd[index]=hWnd;
lcy+2)+ HotKey[index]=cKey;
*P]]7DR HotKeyMask[index]=cMask;
.d$Q5Qae bAdded=TRUE;
D+! S\~u KeyCount++;
|8[!`T*s break;
2J$vX( }
BhbfPQ }
tlg}"lY return bAdded;
Z)=S>06X Q }
ePI N<F;I $UK m[:7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?$tD {
L]"$dF BOOL bRemoved=FALSE;
b\o>4T for(int index=0;index<MAX_KEY;index++){
3XQe? 2:< if(hCallWnd[index]==hWnd){
5 $$Cav if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
X%JyC_~< hCallWnd[index]=NULL;
].aFdy HotKey[index]=0;
0kls/^ 0, HotKeyMask[index]=0;
$)PS#ND& bRemoved=TRUE;
|r?0!;bN0 KeyCount--;
PO0Od z break;
.m>Qlh
}
6GVAR }
@2d9
7.X }
M.Tp)ig\# return bRemoved;
DTo"{! }
-'d`(G" +%KkzdS' void VerifyWindow()
#Z
`Tk)u/ {
omy3<6 for(int i=0;i<MAX_KEY;i++){
iyr8*L\ if(hCallWnd
!=NULL){ 99By.+~pX
if(!IsWindow(hCallWnd)){ O0`ofFN
hCallWnd=NULL; AFvv+
ss
HotKey=0; 5rCJIl.
HotKeyMask=0; f?GoBh<
KeyCount--; $v e$Sq
} 3B,dL|q(@J
} ~]?EV?T
} KydAFxUb
} \T<F#a
i;]# @n|
BOOL CHookApp::InitInstance() 5`Uzx u
{ DKem;_6OQ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); p}/D{|xO
hins=AfxGetInstanceHandle(); aUc#,t;Qd
InitHotkey(); *3@8,~_tp
return CWinApp::InitInstance(); O\Z!7UQ$
} L>E{~yh
eLXL5&}`fh
int CHookApp::ExitInstance() oTXIs4+G
{ kjdIk9 Y
VerifyWindow(); (f_J @n
UnInit(); q *Hg-J}
return CWinApp::ExitInstance(); ^4Xsd h5
} 45<gO1
/0|1xHs
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \ISg6v{/
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Le bc@,
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ r)Zk- !1
#if _MSC_VER > 1000 ./0wt+
#pragma once AS~!YR
#endif // _MSC_VER > 1000 .H qJ)OH
<ME>#,
class CCaptureDlg : public CDialog &sBD0R(a
{ opN4@a7l
// Construction QLHEzEvf{/
public: <n~.X<6V'
BOOL bTray; 7,Z<PE
BOOL bRegistered; ;/?w-)n?
BOOL RegisterHotkey(); #<sK3 PT
UCHAR cKey; !T
,=kh
UCHAR cMask; @.}Y'`9L
void DeleteIcon(); /%p
~
void AddIcon(); QOrMz`OA
UINT nCount; $""kZ
void SaveBmp(); #=ij</
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8No'8(dPX
// Dialog Data `Eu,SvkF w
//{{AFX_DATA(CCaptureDlg) h>cjRH?e
enum { IDD = IDD_CAPTURE_DIALOG }; cT/mi":8{
CComboBox m_Key; %0}}Qt
BOOL m_bControl; 2DJg__("
BOOL m_bAlt; L;{{P7
BOOL m_bShift; c VO-iPK
CString m_Path; [cznhIvyO
CString m_Number; K{@xZ)
//}}AFX_DATA 0_+
& [g}
// ClassWizard generated virtual function overrides }-XZ1qr
//{{AFX_VIRTUAL(CCaptureDlg) {+d)M
public: ~[og\QZX
virtual BOOL PreTranslateMessage(MSG* pMsg); Vmh$c*TE
protected: vRf$#fBEQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7w8UnPuM
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); RF'nwzM3
//}}AFX_VIRTUAL s] ;P<
// Implementation D2gyn-]\
protected: um_J%v6ER
HICON m_hIcon; " Qyi/r41
// Generated message map functions *f>\X[wN
//{{AFX_MSG(CCaptureDlg) Jq? zr]"A
virtual BOOL OnInitDialog(); a'Zw^g
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,2 W=/,5A
afx_msg void OnPaint(); <]|HGc
afx_msg HCURSOR OnQueryDragIcon(); .q4$)8[Pg
virtual void OnCancel(); 9Hb|$/FD
afx_msg void OnAbout(); {.KD#W
$5
afx_msg void OnBrowse(); p>3QW3<
afx_msg void OnChange(); a;-%C{S9r
//}}AFX_MSG I\c7V~^hnG
DECLARE_MESSAGE_MAP() ONy\/lu|
}; %N(>B_t\
#endif #9.%>1{6Y
t?Qbi)T=z
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file uW FyI"
#include "stdafx.h" Hy,""Py
#include "Capture.h" h7TkMt[l
#include "CaptureDlg.h" +Ig%h[1a
#include <windowsx.h> ZUS5z+o
#pragma comment(lib,"hook.lib") xaoR\H
#ifdef _DEBUG ,RY;dX-#
#define new DEBUG_NEW c|aX4 =Z
#undef THIS_FILE W(4$.uZ)
static char THIS_FILE[] = __FILE__; Zby3.=.e
#endif CQa8I2VF
(
#define IDM_SHELL WM_USER+1 cjO%X
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .sM,U
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oqhJ2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; xJU]py~o
class CAboutDlg : public CDialog *_#2|96)
{ S&XlMu
public: 6\I1J=
C
CAboutDlg(); 6J}Yr5oD
// Dialog Data 6vps`k$,~
//{{AFX_DATA(CAboutDlg) nHq4f&(H
enum { IDD = IDD_ABOUTBOX }; mXS]SE
//}}AFX_DATA XK@&$~iA3
// ClassWizard generated virtual function overrides YX)Rs
Vf
//{{AFX_VIRTUAL(CAboutDlg) WvfM.D!
protected: Kn= EDtg
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .j^BWr
//}}AFX_VIRTUAL T{m) = (q
// Implementation $0un`&W
protected: S
~fz
//{{AFX_MSG(CAboutDlg) =2=rPZw9
//}}AFX_MSG yZgWFf.X
DECLARE_MESSAGE_MAP()
EStui>ho
}; xDH#K0-#L
j3N d4#
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P6La)U`VA
{ xfI0P0+
//{{AFX_DATA_INIT(CAboutDlg) i4h`jFS
//}}AFX_DATA_INIT 9%NobT
} IvY3iRq6
AJ&j|/
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *V\.6,^v
{ EU|IzUjFj|
CDialog::DoDataExchange(pDX); (S+/e5c)
//{{AFX_DATA_MAP(CAboutDlg) 2fu<s^9dh
//}}AFX_DATA_MAP 1ywdcg
} 19y,O0# _
3#dz6+
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) C#yRop_d]o
//{{AFX_MSG_MAP(CAboutDlg) FBB<1( {A
// No message handlers G}+@C]
//}}AFX_MSG_MAP E"S#d&9
END_MESSAGE_MAP() |o9`h 9i
u7RlxA:
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w%iwxo
: CDialog(CCaptureDlg::IDD, pParent) `sso Wn4
{ W}3%BWn
//{{AFX_DATA_INIT(CCaptureDlg) } eHxw+.
m_bControl = FALSE; S$$SLy:P
m_bAlt = FALSE; #Ktk[ "6
m_bShift = FALSE; L97 ~ma
m_Path = _T("c:\\"); T`Up%5Dk
m_Number = _T("0 picture captured."); 2PRiiL@
nCount=0; >JsVIfAF
bRegistered=FALSE; Z}\,rex
bTray=FALSE; 6S_mfWsi
//}}AFX_DATA_INIT Y*\h?p[,
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rTVv6:L
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ZN;ondp4
} E0fMFG^P
~|O; Sdo=
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Eri007? D
{ $%"hhju
CDialog::DoDataExchange(pDX); N"G\H<n
//{{AFX_DATA_MAP(CCaptureDlg) r63l(
DDX_Control(pDX, IDC_KEY, m_Key); fpC":EX@r
DDX_Check(pDX, IDC_CONTROL, m_bControl); z[<Na3]
DDX_Check(pDX, IDC_ALT, m_bAlt); Bt,'g*Cs
DDX_Check(pDX, IDC_SHIFT, m_bShift); s5mJ
-
DDX_Text(pDX, IDC_PATH, m_Path);
3F!)7
DDX_Text(pDX, IDC_NUMBER, m_Number); *c/V('D/
//}}AFX_DATA_MAP m;{HlDez
} $MwBt
fmQif]J;;
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) FGyrDRDwC
//{{AFX_MSG_MAP(CCaptureDlg) p_&B+
<z
ON_WM_SYSCOMMAND() x7<l*WQ
ON_WM_PAINT() fKr_u<|
ON_WM_QUERYDRAGICON() }[UH1+`L
ON_BN_CLICKED(ID_ABOUT, OnAbout) pL;e(lM
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) V59!}kel1%
ON_BN_CLICKED(ID_CHANGE, OnChange) Db*b"/]
//}}AFX_MSG_MAP -.MJ3
END_MESSAGE_MAP() 4[]*=
% 33O)<?
BOOL CCaptureDlg::OnInitDialog() pt3)yj&XE
{ DeNWh2
CDialog::OnInitDialog(); [f lK
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $/g`{OI]K
ASSERT(IDM_ABOUTBOX < 0xF000); a.gMH
uL
CMenu* pSysMenu = GetSystemMenu(FALSE); U>.5vK.+
if (pSysMenu != NULL) >]gB@tn[
{ LiQH!yHW
CString strAboutMenu; ;}U]^LT=
strAboutMenu.LoadString(IDS_ABOUTBOX);
8J$1N*J|
if (!strAboutMenu.IsEmpty()) *aWh]x9TlU
{
%r.C9
pSysMenu->AppendMenu(MF_SEPARATOR); !> +Lre@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %5KK#w "
} v@yqTZ
} $V?sD{=W
SetIcon(m_hIcon, TRUE); // Set big icon
=A'JIssk
SetIcon(m_hIcon, FALSE); // Set small icon ^%Cd@!dk
m_Key.SetCurSel(0); P, l
(4
RegisterHotkey(); Vh?vD:|
CMenu* pMenu=GetSystemMenu(FALSE); |zP~/
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \#w8~+`Gq
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); c7@/<*E+
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Cu24xP`
return TRUE; // return TRUE unless you set the focus to a control : fYfXm
} }wvR s5;o
Gsy>"T{CY
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |IzL4>m:;
{ L/WRVc6
if ((nID & 0xFFF0) == IDM_ABOUTBOX) iM:-750n/
{ G:lhrT{
CAboutDlg dlgAbout; ps,Kj3^T<
dlgAbout.DoModal(); zZRLFfz<9
} StTxga|
else nFG X2|d
{ W|rAn2H
CDialog::OnSysCommand(nID, lParam); 7]5~ml3:
} w%)RX<h dI
} PyHL`PZZ
V/"RCqY4
void CCaptureDlg::OnPaint() v*JKLA
{ +,ar`:x&a
if (IsIconic()) H\<0{#F
{ C\BKdx5;
CPaintDC dc(this); // device context for painting A=|a!N/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h@ ZC{B
// Center icon in client rectangle O_th/hl
int cxIcon = GetSystemMetrics(SM_CXICON); [qkW/qS
int cyIcon = GetSystemMetrics(SM_CYICON); 5MCgmF*Y2
CRect rect; <_eEpG}9
GetClientRect(&rect); 0k?]~f
int x = (rect.Width() - cxIcon + 1) / 2; S\t!7Xs%*U
int y = (rect.Height() - cyIcon + 1) / 2; ebCS4&c
// Draw the icon #EE<MKka
dc.DrawIcon(x, y, m_hIcon); PlA#xnq#
} 8L/XZ)
else =B;qy7?
{ P~:^bU^F7
CDialog::OnPaint(); T8&sPt,f
} u R5h0Fi
} `}sFT:1&
rZ-< Ryg
HCURSOR CCaptureDlg::OnQueryDragIcon() 1)ij*L8k
{ X_D-K F
return (HCURSOR) m_hIcon; f]?&R c2C
} 06.8m;{N
w^nA/=;r
void CCaptureDlg::OnCancel() `VGw5o
{ Th\T$T`X$
if(bTray) '4u/ g
DeleteIcon(); &X`
lh P
CDialog::OnCancel(); tK *y/S
} lcReRcjm
]=xX_
void CCaptureDlg::OnAbout() &vN!>bR
{ y,`0f|
CAboutDlg dlg; ..'"kX:5
dlg.DoModal(); $;=?[Cn
} \j wxW6>
p*YV*Arv
void CCaptureDlg::OnBrowse() DyZ6&*s$
{ 0
.T5%
_/
CString str; 9X33{
BROWSEINFO bi; Tl-%;X<X
char name[MAX_PATH]; ?g@X+!RB
ZeroMemory(&bi,sizeof(BROWSEINFO)); x00'wY|
bi.hwndOwner=GetSafeHwnd(); wnXU=
bi.pszDisplayName=name; !m'Rp~t
bi.lpszTitle="Select folder"; ,g"JgX
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2dJE`XL
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Rx&.,gzj[
if(idl==NULL) LXrk5>9
return; a;~< iB;3"
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); /#eS3`48
str.ReleaseBuffer(); "66#F
m_Path=str; J[S!<\_!
if(str.GetAt(str.GetLength()-1)!='\\') r#w 7qEtD
m_Path+="\\"; Z]k@pR !
UpdateData(FALSE); 4JO16
} KE5>O1
xc`O\z_)
void CCaptureDlg::SaveBmp() +s`cXTlFrk
{ T4ugG?B*
CDC dc; c3PA<q[
dc.CreateDC("DISPLAY",NULL,NULL,NULL); <)sL8G9Y
CBitmap bm; *(]ZdB_2
int Width=GetSystemMetrics(SM_CXSCREEN); `}$bJCSF.n
int Height=GetSystemMetrics(SM_CYSCREEN); Jx`7W1%T
bm.CreateCompatibleBitmap(&dc,Width,Height); ]EDCs?,
CDC tdc; L
9cXgd
tdc.CreateCompatibleDC(&dc); mC0Dj O
CBitmap*pOld=tdc.SelectObject(&bm); i=P}i8,^=
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); THK^u+~LM
tdc.SelectObject(pOld); w&VDe(:~
BITMAP btm; TPKD'@:x
bm.GetBitmap(&btm); f;,*P,K
DWORD size=btm.bmWidthBytes*btm.bmHeight; 0blbf@XA
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [fvjvN`
BITMAPINFOHEADER bih; [4dX[
bih.biBitCount=btm.bmBitsPixel; 1Id"|/b%$
bih.biClrImportant=0; {KEmGHC4R
bih.biClrUsed=0; H%Lln#
bih.biCompression=0; m,]9\0GUd
bih.biHeight=btm.bmHeight; l4iklg3
bih.biPlanes=1; ]8Xip/uE
bih.biSize=sizeof(BITMAPINFOHEADER); Clap3E|a
bih.biSizeImage=size; Ja/
bih.biWidth=btm.bmWidth; `@:TS)6X0
bih.biXPelsPerMeter=0; aZtM
_
bih.biYPelsPerMeter=0; V
joVC$ZX
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); oY; C[X
static int filecount=0; eC6wrpZO
CString name; pY\=f0]
name.Format("pict%04d.bmp",filecount++); *1_Ef).
name=m_Path+name; ,zK E$
BITMAPFILEHEADER bfh; #@1(
bfh.bfReserved1=bfh.bfReserved2=0; 4HGS
bfh.bfType=((WORD)('M'<< 8)|'B'); STg}
Z
bfh.bfSize=54+size; "i*gJFW|
bfh.bfOffBits=54; V(io!8,
CFile bf; Rs"G8Q9Q
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n)35-?R/M
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'W("s
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vu E$-)&)
bf.WriteHuge(lpData,size); ]P>XXE;[
bf.Close(); Y)(yw \&v
nCount++; `}bvbvmA
} <nN# K{AH
GlobalFreePtr(lpData); "o_'q@.}
if(nCount==1) 6'<[QoW];
m_Number.Format("%d picture captured.",nCount); G!%8DX5
else J^<uo(
m_Number.Format("%d pictures captured.",nCount); 88?O4)c
UpdateData(FALSE); )24M?R@r
} tL<.B
3Z#WAhfS:
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?*7Mn`
{ \.Op6ECV9
if(pMsg -> message == WM_KEYDOWN) "{t]~urLd
{ 0O*kC43E_
if(pMsg -> wParam == VK_ESCAPE) ~ ^
return TRUE; [/n@BK
if(pMsg -> wParam == VK_RETURN) $P%cdJ T0
return TRUE; ~$"2,&
} P4/~_$e
return CDialog::PreTranslateMessage(pMsg); b&LAk-}[
} O(D2F$VlL
BIe:7cR%
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 39F
e#u
{ =1,1}OucP
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]bpgsW:Xu
SaveBmp(); yq^Ma
return FALSE; _z 5W*..
} +PKsiUJ|
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x)eoz2E1
CMenu pop; MPw?HpM
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S3E5^n\\
CMenu*pMenu=pop.GetSubMenu(0); GCfVH?Vx
pMenu->SetDefaultItem(ID_EXITICON); R-1MD
CPoint pt; mF jM6pmo
GetCursorPos(&pt); AS;qJ)JfzQ
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |')PQ
if(id==ID_EXITICON) Aq3\Q>klH)
DeleteIcon(); &Vgpv#&Cfx
else if(id==ID_EXIT) g0B%3v
OnCancel(); G|8>Q3D
return FALSE; QgQ$>
} YgS,5::SU
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <c!gg7@pm
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v7`{6Pf_$
AddIcon(); 4i+%~X@p
return res; J1~E*t^
} f:J-X~T_f
#Q*V9kvU/H
void CCaptureDlg::AddIcon() qc\D=3#Yp
{ O7uCTB+
NOTIFYICONDATA data; uI%7jA~@
data.cbSize=sizeof(NOTIFYICONDATA); BHZhdm@),
CString tip; t*)mX2R,
tip.LoadString(IDS_ICONTIP); 257$ !
data.hIcon=GetIcon(0); 7\R"RH-
data.hWnd=GetSafeHwnd(); =oI6yf&8 Z
strcpy(data.szTip,tip); n+YUG
data.uCallbackMessage=IDM_SHELL; ecQ,DOX|b
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |d*a~T0
data.uID=98; pIYXYQ=Z
Shell_NotifyIcon(NIM_ADD,&data); -V[x
q
ShowWindow(SW_HIDE); 1<_/Qu>V
bTray=TRUE; 0(:SEiz6s
} FOMJRq
vZ.<OD4
void CCaptureDlg::DeleteIcon() < *;GJ{
{ %b4tyX:N0
NOTIFYICONDATA data; `ZI -1&Y3
data.cbSize=sizeof(NOTIFYICONDATA); (K84J*;
data.hWnd=GetSafeHwnd(); R*6B@<p,i
data.uID=98; /wt7KL-I
Shell_NotifyIcon(NIM_DELETE,&data); \x]\W#C
ShowWindow(SW_SHOW); PJe_qP
SetForegroundWindow(); L
G5_\sY!
ShowWindow(SW_SHOWNORMAL); 8UqH"^9.Q7
bTray=FALSE; xSSEDfq
} tpO'<b
,-8-Y>[
void CCaptureDlg::OnChange() Q9xb7)G
{ HTGLFY(&
RegisterHotkey(); !U1
vW}H
} 5r~jo7
N~l*//Ep
BOOL CCaptureDlg::RegisterHotkey() P*~
vWYH9
{ AovBKB
$
UpdateData(); zp<B,Ls
UCHAR mask=0; vlE]RB
UCHAR key=0; 7}6CUo
if(m_bControl) ms&1P
mask|=4; 0H_uxkB~
if(m_bAlt) A1,q3<<D%
mask|=2; 0BhcXHt
if(m_bShift) ]W`?0VwF
mask|=1; |('o g *$
key=Key_Table[m_Key.GetCurSel()]; X:;x5'|
if(bRegistered){ '@Rk#=85Z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); &r4|WM/ec
bRegistered=FALSE; s*<T'0&w0S
} )`R}@(r.
cMask=mask; %!(C?k!\
cKey=key; PM#3N2?|E
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /WE\0bf
return bRegistered; *vuI'EbM
} 5rdB>8W
,p#B5Dif/
四、小结 ,I x>.^|
2Ki_d
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。