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:
+dgHl_,i
n^P~]1i 一、实现方法
y
+2 ]#*S. r] 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:
2\/,X CQV 5gZ6H/. #pragma data_seg("shareddata")
]:X# w0UR HHOOK hHook =NULL; //钩子句柄
<*'%Xgm UINT nHookCount =0; //挂接的程序数目
$wBF'|eU static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
znxP.=GB static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
]dj
W^C]94 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
{BS}9jZx static int KeyCount =0;
o&Vti"fpC static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
{Jx-Zo>' #pragma data_seg()
vdt ": _b)=ERBbCo 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
?n0Z4 8% l1?$quM^V 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:
b2<((H ^KRe( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*@1(!A cKey,UCHAR cMask)
V@C8HTg
{
k/;%{@G) BOOL bAdded=FALSE;
K\3N_ztu for(int index=0;index<MAX_KEY;index++){
PDi]zp9>H if(hCallWnd[index]==0){
xB<^ar hCallWnd[index]=hWnd;
q<Sb>M/\, HotKey[index]=cKey;
`EJ.L6j$' HotKeyMask[index]=cMask;
qjrl$[`X: bAdded=TRUE;
CNkI9>L=W` KeyCount++;
(<ZpT%2 break;
N3rq8Rk }
T>cO{I }
Am @o}EC return bAdded;
Xvr7qowL }
>=+:lD //删除热键
`k]2*$% BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cKM#0dq {
)d$FFTH BOOL bRemoved=FALSE;
5z~O3QX for(int index=0;index<MAX_KEY;index++){
)nM<qaI{ if(hCallWnd[index]==hWnd){
XTro;R=# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_yN&+]c hCallWnd[index]=NULL;
49?wEm# HotKey[index]=0;
:Q-QY)hH HotKeyMask[index]=0;
=Sp+$:q* bRemoved=TRUE;
ALY3en9, KeyCount--;
4A{6)<e break;
q4y sTm }
# X`t~Y' }
$3'xb/3| }
JV`"kk/ return bRemoved;
uG){0%nX }
b2 5.CGF \Aq$h:< Zb4+zps^- DLL中的钩子函数如下:
o6Jhl8 z55g'+Kab LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
AdgZau[Y6 {
E gD$A!6N8 BOOL bProcessed=FALSE;
.:I^O[k if(HC_ACTION==nCode)
s$D" {
9pMXjsE if((lParam&0xc0000000)==0xc0000000){// 有键松开
pAtt=R,Ht switch(wParam)
a9N$I@bi] {
zc.r&(d case VK_MENU:
8quH#IhB MaskBits&=~ALTBIT;
#Y%(CI break;
?[!_f$50]P case VK_CONTROL:
_fM=J+ MaskBits&=~CTRLBIT;
f>zd,|)At break;
P|tNmv[; case VK_SHIFT:
\TS.9 >\ MaskBits&=~SHIFTBIT;
/)*si break;
0 H0U%x8 default: //judge the key and send message
i*jnC> break;
Min{&?a }
"%rzL.</ for(int index=0;index<MAX_KEY;index++){
m88(f2Ch if(hCallWnd[index]==NULL)
8I]rC<O6: continue;
VoC|z Rd_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+k{l]-)1 {
Q79WGW SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
8JojKH bProcessed=TRUE;
9l<}`/@}W }
k!0vpps }
E|"QYsi.Ck }
#B6$r/% else if((lParam&0xc000ffff)==1){ //有键按下
8'-E>+L switch(wParam)
ufB9\yl{~ {
2UeK%-~W? case VK_MENU:
Xk?Y MaskBits|=ALTBIT;
XYze*8xUb break;
j*_>/gi case VK_CONTROL:
f64}#E|w MaskBits|=CTRLBIT;
4K0Fc^- break;
?W\KIp\Kn case VK_SHIFT:
<~hx ~"c MaskBits|=SHIFTBIT;
_+ERX[i break;
#}+_Hy default: //judge the key and send message
?.g="{5X break;
RV>n Op}R }
l(Y\@@t1 for(int index=0;index<MAX_KEY;index++){
X3j|J/ if(hCallWnd[index]==NULL)
M Ui#3o\f continue;
9/PX~j9O? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
30{+gYA {
%*^s%NI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
@@5JuI-! bProcessed=TRUE;
{`+:!X }
jL*s(Yq }
;]VLA9dC }
bC,SE*F\ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+HF*X~},i for(int index=0;index<MAX_KEY;index++){
}_fVv{D
if(hCallWnd[index]==NULL)
4Ix~Feuph continue;
, GMuq_H if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
I#-T/1N SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
B*^8kc:)L //lParam的意义可看MSDN中WM_KEYDOWN部分
e/Y&d9`
I }
F$HL\y }
GXwQ
)P5] }
98I m/v return CallNextHookEx( hHook, nCode, wParam, lParam );
SD .c9 }
K_}81|= \79aG3MyK 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
&`}ACTY'P ]D@y""{--s BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
J@RV ^2 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?MD\\gN tg;AF<VI 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
7
aN}lQM s@K #M LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
RJE<1!{ {
[(iJj3s! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
jTN!\RH9NF {
Z9UNp[0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
66'AaA;0^i SaveBmp();
IRbZ ;*3dO return FALSE;
7,ffY/ }
*]e9/f …… //其它处理及默认处理
(P 9$Ei0fv }
TB#oauJm, p;rT#R&6> EoOwu-{ 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。
;|.IUXEgcF yG:Pg MrB 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。
"FXT8Qxg '_%`0p1 二、编程步骤
=%0r_#F%= X`0`A2
n 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";
ktiC*|fd K~
VUD( 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
_j?/O)M
c }>?"bcJ 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;
k2DBm q; |\/V1 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;
!z_VwZ#, PHqIfH [ 5、 添加代码,编译运行程序。
^:]~6p# J0yo@O 三、程序代码
AjMx \'(C S*a_ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
$qk(yzY #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
CDGN}Q2 _ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
u
=|A #if _MSC_VER > 1000
fMIKA72>{ #pragma once
qW t 9Tr #endif // _MSC_VER > 1000
BZRC0^-C@ #ifndef __AFXWIN_H__
r&D&xsbQ #error include 'stdafx.h' before including this file for PCH
Gu\lV c #endif
QW6\~l 4 #include "resource.h" // main symbols
6Ej@;]^^- class CHookApp : public CWinApp
xyRZ
v]K1 {
Z{
b($po public:
84YZT+TEN CHookApp();
gfU!sYZ // Overrides
Hh0a\%! // ClassWizard generated virtual function overrides
['_G1_p //{{AFX_VIRTUAL(CHookApp)
Hbi2amfBu public:
#AUa'qBt virtual BOOL InitInstance();
< c[dpK5c virtual int ExitInstance();
M\jTeB"Z //}}AFX_VIRTUAL
2Ls //{{AFX_MSG(CHookApp)
\7A6+[
`fa // NOTE - the ClassWizard will add and remove member functions here.
roE*8:Y // DO NOT EDIT what you see in these blocks of generated code !
AE&IN.- //}}AFX_MSG
}|4dEao\ DECLARE_MESSAGE_MAP()
AV^Sla7|_ };
^n8r mh_% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
NRZ>03w BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
J(%kcueb
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
VU
8~hF BOOL InitHotkey();
%)G]rta# BOOL UnInit();
i*Ee(m]I #endif
9UeK}Rl^n |\S p IFH1 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
f
iu?mb=* #include "stdafx.h"
jwZBWt )5 #include "hook.h"
w65D;9/; #include <windowsx.h>
3*$)9' #ifdef _DEBUG
i;8tA! #define new DEBUG_NEW
)gP0+W!u #undef THIS_FILE
^PI8Bvs>j static char THIS_FILE[] = __FILE__;
Hm55R #endif
h` ,! p #define MAX_KEY 100
x1{gw 5: #define CTRLBIT 0x04
>s+*D=k #define ALTBIT 0x02
$r87]y! #define SHIFTBIT 0x01
E0a &1j #pragma data_seg("shareddata")
=)9@rV&~ HHOOK hHook =NULL;
8^%Nl `_2B UINT nHookCount =0;
a5# B&|#q static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
U>s$}Y:+Z static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[p#
}=&d static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
yZ]u{LJS static int KeyCount =0;
JJ$q * static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
9Lv"|S`5W_ #pragma data_seg()
$C8nPl' 7 HINSTANCE hins;
Wa+q[E void VerifyWindow();
V_Oj?MMpn BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
>g FEA0- //{{AFX_MSG_MAP(CHookApp)
=g+Rk+ jn // NOTE - the ClassWizard will add and remove mapping macros here.
]7yr.4?a // DO NOT EDIT what you see in these blocks of generated code!
G@Y!*ZH*f //}}AFX_MSG_MAP
_}(ej&'f END_MESSAGE_MAP()
^E(:nxQ6s
dr iw\ CHookApp::CHookApp()
P85@G
2 {
BNe6q[ )W~ // TODO: add construction code here,
{*J{1)2 // Place all significant initialization in InitInstance
D!d1%hac }
2[qlEtvQ
+*aZ9g CHookApp theApp;
*eonXJYD
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Juqe%he` {
~E tW B BOOL bProcessed=FALSE;
I>( \B| \6 if(HC_ACTION==nCode)
u+Q<>>lU {
6@[7 if((lParam&0xc0000000)==0xc0000000){// Key up
lboi\GP| switch(wParam)
rW(<[2 vg {
V O=
o)H\ case VK_MENU:
rr=e MaskBits&=~ALTBIT;
pZg}7F{$ break;
nD51,1> case VK_CONTROL:
UfWn\*J&k MaskBits&=~CTRLBIT;
O>H'ok
break;
CFU'-
#b case VK_SHIFT:
96FS-` MaskBits&=~SHIFTBIT;
z nxAP| break;
')mR87 default: //judge the key and send message
jA}b=c break;
U2D2?# }
V"`t*m$ for(int index=0;index<MAX_KEY;index++){
at-+%e if(hCallWnd[index]==NULL)
z[`OYwsW continue;
-]K9sy)I if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FELDz7DYya {
3</gK$f2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
H${5pY_M bProcessed=TRUE;
Ghb Jty` }
Z>si%Npm\ }
O<o>/HH$ }
%2jRJ else if((lParam&0xc000ffff)==1){ //Key down
*lT: P- switch(wParam)
,s9gGCA {
A3|hFk case VK_MENU:
:_f5(N*{5o MaskBits|=ALTBIT;
Y 3 QrD&V break;
2aR<xcSg case VK_CONTROL:
c?0.>^,B Q MaskBits|=CTRLBIT;
o'SZsG break;
5v`[c+@F case VK_SHIFT:
(:P-ef$]C MaskBits|=SHIFTBIT;
Gjh8>( break;
<X b B; default: //judge the key and send message
mhDC1lXF break;
i=^!?
i }
t)
:'XGk@ for(int index=0;index<MAX_KEY;index++)
i l5Qo {
DQy<!Wb+ if(hCallWnd[index]==NULL)
bk}'wcX<+] continue;
p9`!.~[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-E(0}\ {
Glw_<ag[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
qTuQ]*[- bProcessed=TRUE;
miTySY6^ }
e#t7 }
<n-}z[09 }
'C2X9/!, if(!bProcessed){
s9)U", for(int index=0;index<MAX_KEY;index++){
O DO'!T- if(hCallWnd[index]==NULL)
O8Dav^\y? continue;
$,)PO
Z if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
h7"c_=w+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-/'_XR@1 }
<(c_[o/ }
L<62-+e` }
o<8('j
return CallNextHookEx( hHook, nCode, wParam, lParam );
e>] gCa }
=+z +`ot NtfzAz/ BOOL InitHotkey()
aVvma= {
Id}/(Pkq if(hHook!=NULL){
{gkzo3 nHookCount++;
EQTJ=\WFF return TRUE;
g]Jt (aYK }
w5+H9R6 else
+ ;LO|! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
lPyY if(hHook!=NULL)
J_S8=`f% nHookCount++;
$&~moAl return (hHook!=NULL);
31^Jg }
m0Geq. BOOL UnInit()
QB.QG!@ {
K!,T.qA&= if(nHookCount>1){
rLpfybu nHookCount--;
NxW
Dw return TRUE;
ki6Lt }
YEPQ/Pc BOOL unhooked = UnhookWindowsHookEx(hHook);
zo|
' if(unhooked==TRUE){
h4#y'E!,Z nHookCount=0;
kfV}ta'^S hHook=NULL;
.<Rw16O }
qeUT]*
w return unhooked;
QJ,[K_ }
5(=5GkE)> 9,wD BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4^Y{ BS fF {
7M/v[dwL BOOL bAdded=FALSE;
m!K`?P]:N for(int index=0;index<MAX_KEY;index++){
('k9X cTPP if(hCallWnd[index]==0){
q
S qS@+p hCallWnd[index]=hWnd;
4=~+Bz HotKey[index]=cKey;
n
"bii7h HotKeyMask[index]=cMask;
#PkZi(k
hv bAdded=TRUE;
&"r /&7: KeyCount++;
W=:AOBK break;
C<Z{G%Qm }
U EjP` }
lDSF return bAdded;
xwF mY'o }
3Cw}y55_y %vil~NU BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Uc;~q-??# {
K0YQ b&*k BOOL bRemoved=FALSE;
m{;j
r< for(int index=0;index<MAX_KEY;index++){
p9>1a j2a if(hCallWnd[index]==hWnd){
k5%W8dI if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
B[,AR"#b hCallWnd[index]=NULL;
BPuum HotKey[index]=0;
\i'Z(1 HotKeyMask[index]=0;
R*=88ds bRemoved=TRUE;
g\% Z+Dc KeyCount--;
AU1U?En break;
E|vXM"zFl }
[=BccT:b }
,g pZz$Ef( }
rJ)j./c return bRemoved;
n_4 r'w }
7 x'2 uOO\!Hqq void VerifyWindow()
DL*vF>v {
#CV]S4/^ for(int i=0;i<MAX_KEY;i++){
r~z'QG6v/ if(hCallWnd
!=NULL){ iInWw"VbKe
if(!IsWindow(hCallWnd)){ W cGg
hCallWnd=NULL; 4{@{VsXN
HotKey=0; /%mT2
HotKeyMask=0; ;1HzY\d%<
KeyCount--; q6,z 1A"
} |h?2~D!+d
}
k^Q.lb
{
} Vu,e]@
} Y4C<4L?
P)l_ :;&
BOOL CHookApp::InitInstance() f"*k>=ETI
{ =C2KHNc
AFX_MANAGE_STATE(AfxGetStaticModuleState()); kuI~lBWI
hins=AfxGetInstanceHandle(); `a%MD>R_Lg
InitHotkey(); ?P}bl_
return CWinApp::InitInstance(); >%ovL8F
} c: r25
RfOJUz
int CHookApp::ExitInstance() 6O<UW.
{ 1<Sg@
VerifyWindow(); f14^VTzP/#
UnInit(); RA!q)/+
return CWinApp::ExitInstance(); /5<= m:
} 8t3m$<7
<.mH-Y5i
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9Ta0Li
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) jU $G<G
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sH.=Faos
#if _MSC_VER > 1000 _jc_(;KPF
#pragma once O%3Hp.|!
#endif // _MSC_VER > 1000 <PVwf`W.
|UlG@Mn
class CCaptureDlg : public CDialog o@BV&|
{ !> =ybRe
// Construction l n\qvD_
public: b[GhI+_
BOOL bTray; m<49<O6o
BOOL bRegistered; >.6|\{*sG
BOOL RegisterHotkey(); f~F{@),acZ
UCHAR cKey; nTv}/M&
UCHAR cMask; vQ
L$.A3>
void DeleteIcon(); PcBD;[cn
void AddIcon(); 5f{P% x(
UINT nCount; :\vs kk),
void SaveBmp(); |{&M#qXe
CCaptureDlg(CWnd* pParent = NULL); // standard constructor )S
7+y6f&*
// Dialog Data r\d(*q3B
//{{AFX_DATA(CCaptureDlg) 43pe6 ^.
enum { IDD = IDD_CAPTURE_DIALOG }; |mP};&b
CComboBox m_Key; ^$50[
BOOL m_bControl; 5Yhcnwdm!
BOOL m_bAlt; BZ=I/L
BOOL m_bShift; \"1>NJn&k)
CString m_Path; i84!x%|P
CString m_Number; <:V~_j6P0
//}}AFX_DATA tEL9hZzI
// ClassWizard generated virtual function overrides veHe
//{{AFX_VIRTUAL(CCaptureDlg) w`;HwK$ ,
public: fz\Q>u'T
virtual BOOL PreTranslateMessage(MSG* pMsg); UXlZI'|He
protected: puJB&u"4L
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >v %js!`f
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J09jBQ]R
//}}AFX_VIRTUAL kDE-GX"Y
// Implementation ~\mh\a&
protected: i1|>JM[V
HICON m_hIcon; .G8>UXX
// Generated message map functions K
J\kR
//{{AFX_MSG(CCaptureDlg) 6q\*{_CPB
virtual BOOL OnInitDialog(); 8f/KNh7#s
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z7ik/>d?
afx_msg void OnPaint(); _Z Sp$>)/
afx_msg HCURSOR OnQueryDragIcon(); Bl*}*S PU
virtual void OnCancel(); ~%8P0AP
afx_msg void OnAbout(); %\v8FCb
afx_msg void OnBrowse(); aknIrblS\
afx_msg void OnChange(); 9H/>M4RT
//}}AFX_MSG |L8
[+_m
DECLARE_MESSAGE_MAP() V2ih/mh
}; *^uK=CH1?(
#endif n&njSj/
)"S%'myj
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file I@MG?ZQ
#include "stdafx.h" uhh7Ft#H
#include "Capture.h" Y>8Qj+d
#include "CaptureDlg.h" N#K)Z5J)b
#include <windowsx.h> c1"wS*u
#pragma comment(lib,"hook.lib") &h0LWPl
#ifdef _DEBUG -;7xUNQ
#define new DEBUG_NEW "_q~S$i^
#undef THIS_FILE Sv T0%2
static char THIS_FILE[] = __FILE__; l!f_ +lv
#endif Qds<j{2
#define IDM_SHELL WM_USER+1 rXi&8R[
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [zx|3wWAX-
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l S)^8
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {+WBi(=W
class CAboutDlg : public CDialog
E.h
{ pM?~AYWb
public: oI;ho6y)
CAboutDlg(); V
9Qt;]mQ
// Dialog Data E{<#h9=>
//{{AFX_DATA(CAboutDlg) t,?,T~#9
enum { IDD = IDD_ABOUTBOX }; q<
XFw-Pv
//}}AFX_DATA o]q~sJVk6
// ClassWizard generated virtual function overrides ]>1Mq,!
//{{AFX_VIRTUAL(CAboutDlg) rO7_K>g?
protected: u%~'+=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )2Ei<
//}}AFX_VIRTUAL hOwb
// Implementation `(FjOd
K
protected: gsbr8zwG,
//{{AFX_MSG(CAboutDlg) =&z+7Pe[
//}}AFX_MSG 2y
-
QH
DECLARE_MESSAGE_MAP() &VGV0K3Dp
}; MY,~leP&
~HB#7+b
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1.du#w
{ dd
//{{AFX_DATA_INIT(CAboutDlg) V: D;?$Jl
//}}AFX_DATA_INIT "V' r}>
} ,D;8~llM
vwT1bw .
void CAboutDlg::DoDataExchange(CDataExchange* pDX) yv4x.cfI2W
{ yMN JHiE/
CDialog::DoDataExchange(pDX); R!M'
//{{AFX_DATA_MAP(CAboutDlg) uppa`addK
//}}AFX_DATA_MAP HPt3WBRzS;
} VW*%q0i-
CtCReH03
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) nnyT,e%
//{{AFX_MSG_MAP(CAboutDlg) v#?DWeaFS_
// No message handlers ?{ )'O+s
//}}AFX_MSG_MAP \6wltTW]#
END_MESSAGE_MAP() @rYZ0`E9
+j 9+~
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) N|yA]dg[
: CDialog(CCaptureDlg::IDD, pParent) VeWh9:"bJ
{ *:CTIV5N0
//{{AFX_DATA_INIT(CCaptureDlg) M7/5e3
m_bControl = FALSE; NCKR<!(
m_bAlt = FALSE; D,cD]tB2
m_bShift = FALSE; v@{y}
m_Path = _T("c:\\"); rN&fFI
m_Number = _T("0 picture captured."); ^aB;Oo
nCount=0; g$uiwqNA%
bRegistered=FALSE; wO,qFY
bTray=FALSE; +ywz@0nx
//}}AFX_DATA_INIT jr`T6!\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]Ozz"4Z
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E{Wn&?i>A
} k9
r49lb
c +]r
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) I0F[Z\U
{ t\/H. Hb
CDialog::DoDataExchange(pDX); E<yQB39
//{{AFX_DATA_MAP(CCaptureDlg) (d&" @
DDX_Control(pDX, IDC_KEY, m_Key); 4BMu0["6|s
DDX_Check(pDX, IDC_CONTROL, m_bControl); f/sz/KC]~
DDX_Check(pDX, IDC_ALT, m_bAlt); 2!6hB sEr
DDX_Check(pDX, IDC_SHIFT, m_bShift); (f&V 7n
DDX_Text(pDX, IDC_PATH, m_Path); +PYV-@q
DDX_Text(pDX, IDC_NUMBER, m_Number); /(~
HHN nh
//}}AFX_DATA_MAP Nf4@m|#
} 791v>h
I%4eX0QY=z
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) dcrvEc_/
//{{AFX_MSG_MAP(CCaptureDlg) =#2%[kG q
ON_WM_SYSCOMMAND() NN7KwVg
ON_WM_PAINT() - k0a((?
ON_WM_QUERYDRAGICON() D\G 8p;
ON_BN_CLICKED(ID_ABOUT, OnAbout) |KJGM1]G
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) r3Ol?p
ON_BN_CLICKED(ID_CHANGE, OnChange) YHN6/k7H
//}}AFX_MSG_MAP f4S}Nga(
END_MESSAGE_MAP() !\'w>y7
iYLg[J"
BOOL CCaptureDlg::OnInitDialog() c^_+<C-F
{ ;ab[YMkH
CDialog::OnInitDialog(); 5i6Ji(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )P7oL.)
ASSERT(IDM_ABOUTBOX < 0xF000); \ ERBb.
CMenu* pSysMenu = GetSystemMenu(FALSE); w?D=
if (pSysMenu != NULL) A@3'I ;
{ 'cCM[P+
CString strAboutMenu; ar@,SKU'K
strAboutMenu.LoadString(IDS_ABOUTBOX); Z84w9y7O<
if (!strAboutMenu.IsEmpty()) d*TH$-F!p
{ yHY2 SXm
pSysMenu->AppendMenu(MF_SEPARATOR); _Q #[IH9
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HHx5VI
} ]fY:+Ru
} eF;Jj>\R+i
SetIcon(m_hIcon, TRUE); // Set big icon "A[.7 w
SetIcon(m_hIcon, FALSE); // Set small icon {v!w2p@
m_Key.SetCurSel(0); HAc"pG
RegisterHotkey(); qi@Nz=t#HJ
CMenu* pMenu=GetSystemMenu(FALSE); ]#N8e?b,
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;-i)}<
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vo#$xwm1
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \ $TM=Ykj
return TRUE; // return TRUE unless you set the focus to a control T pCXe\W
} rE"FN~9P
<DMm
[V{
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]Y,V)41gCE
{ 1^AQLOiRE1
if ((nID & 0xFFF0) == IDM_ABOUTBOX) +^J&x>5
{ `_D A!
CAboutDlg dlgAbout; \HD:#a
dlgAbout.DoModal(); Uvk:
} "wVisL2+.
else )[99SM
{ 2L<1]:I
CDialog::OnSysCommand(nID, lParam); FS7D
} >uJu!+#
} 3Q&@l49q
z>W?\[E<2
void CCaptureDlg::OnPaint() #Hy9 ;Q
{ f/
3'lPK^
if (IsIconic()) .mnkV -m
{ 2kgSIvk\
CPaintDC dc(this); // device context for painting -4Q\FLC'k
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); YPs9Pqkn
// Center icon in client rectangle :S`12*_g"
int cxIcon = GetSystemMetrics(SM_CXICON); 2UR1T~r
int cyIcon = GetSystemMetrics(SM_CYICON); UN<$F yb
CRect rect; 4[Ko|
GetClientRect(&rect); C\[:{d
int x = (rect.Width() - cxIcon + 1) / 2; #.FhN x
int y = (rect.Height() - cyIcon + 1) / 2; (Rs;+S
// Draw the icon &/Gf@[
dc.DrawIcon(x, y, m_hIcon); 9r:|u:i7m
} \1u^?cBd
else Yl1l$[A$
{ Ut%{pc 7^F
CDialog::OnPaint(); U+-;(Fh~
} x[&)\[t
} MTR+|I3V
4Qi-zNNB
HCURSOR CCaptureDlg::OnQueryDragIcon() ,\T `gh
{ 6XAofN/5f
return (HCURSOR) m_hIcon; !;t6\Z8&
} X&Ospl@H
$;";i:H`
void CCaptureDlg::OnCancel() O*F= xG
{ N+]HJ`K
if(bTray) 6 {`J I
DeleteIcon(); [$]-W$j+
CDialog::OnCancel(); D7IhNWrgj
} B_@p@6z
iDCQqj`
void CCaptureDlg::OnAbout()
zGL.+@
{ m8l!+8
CAboutDlg dlg; VYK%0S9yH[
dlg.DoModal(); 6m:$RW
} zo
]-,u
V\c`O
void CCaptureDlg::OnBrowse() IUG}Q7w5
{ X2 <fS~m
CString str; *\0h^^|@
BROWSEINFO bi; x9]vhR/av
char name[MAX_PATH]; A0ZU #"'/
ZeroMemory(&bi,sizeof(BROWSEINFO)); ASSe;+yp
bi.hwndOwner=GetSafeHwnd(); X=jD^"-
bi.pszDisplayName=name; ;wHyX)&X$
bi.lpszTitle="Select folder"; ey:%Zy
[~
bi.ulFlags=BIF_RETURNONLYFSDIRS; ##"
Hui
LPITEMIDLIST idl=SHBrowseForFolder(&bi); bdBLfWe
if(idl==NULL) ;e2D}
return; .8|"@
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); qP9`p4c8i
str.ReleaseBuffer(); b$/7rVH!
m_Path=str; y?iW^>|?L=
if(str.GetAt(str.GetLength()-1)!='\\') !@h)3f]`1G
m_Path+="\\"; MbQ%'z6D
UpdateData(FALSE); WQ{^+C9g'1
} #A~7rH%hi
nx!+:P ,
void CCaptureDlg::SaveBmp() .|:R#VW
{ 2H1?f|0>
CDC dc; `Gg,oCQg
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5p7i9"tgn
CBitmap bm; KO))2GET
int Width=GetSystemMetrics(SM_CXSCREEN); e[QEOx/-h2
int Height=GetSystemMetrics(SM_CYSCREEN); HSACaTVK
bm.CreateCompatibleBitmap(&dc,Width,Height); /W{^hVkvC
CDC tdc; w,1*dn
tdc.CreateCompatibleDC(&dc); !W b Q9o
CBitmap*pOld=tdc.SelectObject(&bm); 6anH#=(
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y=}o|/5"
tdc.SelectObject(pOld); ,9buI='
BITMAP btm; 0.~s>xXp
bm.GetBitmap(&btm); E,/nK
DWORD size=btm.bmWidthBytes*btm.bmHeight; QwnqysNx4
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S`h yRw
BITMAPINFOHEADER bih; ] $F%
bih.biBitCount=btm.bmBitsPixel; uOx"oR|
bih.biClrImportant=0; BWkTQd<t
bih.biClrUsed=0;
[1e/@eC5
bih.biCompression=0; 5hDm[*83
bih.biHeight=btm.bmHeight; bW GMgC
bih.biPlanes=1; Rf!$n7& \
bih.biSize=sizeof(BITMAPINFOHEADER); mW3IR3b
bih.biSizeImage=size; =)!~t/
bih.biWidth=btm.bmWidth; ! ^aJS'aq
bih.biXPelsPerMeter=0; cmp@Ow"c
bih.biYPelsPerMeter=0; Vzh\1cF
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g]?QV2bX6
static int filecount=0; Ki[&DvW:
CString name; b~!Q3o'W
name.Format("pict%04d.bmp",filecount++); @n$/2y_.
name=m_Path+name; 2t3)$\ylQp
BITMAPFILEHEADER bfh; AD7&-=p&w
bfh.bfReserved1=bfh.bfReserved2=0; 0>3Sn\gZ(
bfh.bfType=((WORD)('M'<< 8)|'B'); F ^)(
7}ph
bfh.bfSize=54+size; -{p~sRc&
bfh.bfOffBits=54; 5[`f(;
CFile bf; G4EuW *~
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ dlDO?T
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [n$6T
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &3 x
[0DV
bf.WriteHuge(lpData,size); K*tomy
bf.Close(); xE6hE'rh.O
nCount++; p%+'iDb
} _"#n%@
GlobalFreePtr(lpData); 1 l-Y)
if(nCount==1) qKI)*o062
m_Number.Format("%d picture captured.",nCount); vSo,,~F
else u y13SkW
m_Number.Format("%d pictures captured.",nCount); U ?6.UtNf
UpdateData(FALSE); 'On%p|s)H
} K#x|/b'5d
WS\Ir-B
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S3y('
PeF
{ o}Q3mCB
if(pMsg -> message == WM_KEYDOWN) *dxE
( dP
{ 6&"GTK
if(pMsg -> wParam == VK_ESCAPE) {Ok]$0L
return TRUE; CE|rn8MB
if(pMsg -> wParam == VK_RETURN) _rW75n=3b7
return TRUE;
[$`%ve
} .|KBQMI
return CDialog::PreTranslateMessage(pMsg); /Uni6O)oc
} OyIIJ!(
dlioa Yc
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d*LW32B@
{ 0\wW%3C
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ O&@CT] )8
SaveBmp(); |+Tq[5&R
return FALSE; ?:i,%]zxC
} lPg?Fk7AP
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -o@L"C>
CMenu pop; CrYPcvd6
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &&
b;Wr
CMenu*pMenu=pop.GetSubMenu(0); :c9 H2
pMenu->SetDefaultItem(ID_EXITICON); X?'pcYSL
CPoint pt; ]3L/8]:
GetCursorPos(&pt); MAL;XcRR
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `ix&j8E22w
if(id==ID_EXITICON) n]jw!;
DeleteIcon(); z2 mjm
else if(id==ID_EXIT) `r&]Ydu:
OnCancel(); h*\u0yD)
return FALSE; [-VIojs+u
} @jKB[S;JSn
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _>4)q=
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) U,Fyi6{~
AddIcon(); ^`bMFsP
return res; c-ql
} D"&Sd@a{
6>z,7 [
void CCaptureDlg::AddIcon() /Edq[5Ah
{ 0@Z}.k30
NOTIFYICONDATA data; Yzw[.(jc}
data.cbSize=sizeof(NOTIFYICONDATA); JgBC:t^\pV
CString tip; rbrh;\<jM
tip.LoadString(IDS_ICONTIP); wv^n#
data.hIcon=GetIcon(0); ~,.;2K73
data.hWnd=GetSafeHwnd(); #g<6ISuf
strcpy(data.szTip,tip); k&17 (Tv$
data.uCallbackMessage=IDM_SHELL; P[tYu:
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; TrBW0Bn>p
data.uID=98; U|x#'jGo'
Shell_NotifyIcon(NIM_ADD,&data); [gj>ey8T
ShowWindow(SW_HIDE); @]Lu"h#u=
bTray=TRUE; LX#gc.c
} 8k;il54#
k`J|]99Wb
void CCaptureDlg::DeleteIcon() 6i@* L\
Dl
{ -s]@8VJA"
NOTIFYICONDATA data; M[(pLYq:
data.cbSize=sizeof(NOTIFYICONDATA); $CZ'[`+
data.hWnd=GetSafeHwnd(); \r"gqv)^
data.uID=98; TQ=HFs
~
Shell_NotifyIcon(NIM_DELETE,&data); 0B:
v0R
ShowWindow(SW_SHOW); KtHkLYOCG
SetForegroundWindow(); ]`M2Kwp
ShowWindow(SW_SHOWNORMAL); ygQe'S{!S\
bTray=FALSE; ;RYIc0%
} DKF
'*
5<YL^m{/L
void CCaptureDlg::OnChange() tTWEhHQ`
{ 'UM *7
RegisterHotkey(); d{Owz&PL
} A#Y:VavQ?
OsKtxtLO
BOOL CCaptureDlg::RegisterHotkey() d0;?GQYn:
{ V)P8w#,
UpdateData(); %< `D'V@
UCHAR mask=0; 9dWz3b1[]
UCHAR key=0; `\f 3Ij,
if(m_bControl) 9*r^1PRc
mask|=4; cZ# %tT#
if(m_bAlt) F6aC'<#/
mask|=2; KtGbpcS$f
if(m_bShift) AWJA?
mask|=1; QQv%>=_`
key=Key_Table[m_Key.GetCurSel()]; <T&v\DN
if(bRegistered){ '.&Y)A6!
DeleteHotkey(GetSafeHwnd(),cKey,cMask); D}Sww5ZmP
bRegistered=FALSE; /Q_Dd
} <. *bJ
cMask=mask; kpxGC,I^*.
cKey=key; '.k'*=cq0
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^b.#4i(v
return bRegistered; 6[SIDOp*^
} b`@J"E}
7VL|\^Y `q
四、小结 na"!"C
s3
m.<u!MI
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。