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:
x$ ?{)EY
[#$z.BoEo 一、实现方法
v.c2(w/P }| (KI 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
KPs5? X jx+%X\zokA #pragma data_seg("shareddata")
A#f@0W: HHOOK hHook =NULL; //钩子句柄
Tr-gdX ; UINT nHookCount =0; //挂接的程序数目
)1Z*kY?f! static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
+}J2\!Jw static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
w-"o?;)a static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
%, XyhS5[o static int KeyCount =0;
[x'xbQLGd static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
vB#&XK.aW #pragma data_seg()
Cn[`] WpWnwQY`# 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
w f,7 eICk}gfun DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
m("!
M~1 Jx[IHE BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ZBB^?FF cKey,UCHAR cMask)
yo#& >W {
]b-Z;Nce BOOL bAdded=FALSE;
+79?}| for(int index=0;index<MAX_KEY;index++){
k]] (I<2 if(hCallWnd[index]==0){
F]q pDv hCallWnd[index]=hWnd;
&zynfj#o HotKey[index]=cKey;
]o6Or,ml HotKeyMask[index]=cMask;
XA-DJ bAdded=TRUE;
hmHm;l KeyCount++;
!dv break;
CY<,p$ }
% tN{ }
ez"Xb 7 return bAdded;
Z1wN+Y.CA }
;%"UZ~]f //删除热键
o=X6PoJN_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{]n5h#c 5* {
1t
WKH BOOL bRemoved=FALSE;
^EPM~cEY\ for(int index=0;index<MAX_KEY;index++){
6OkN(tL&. if(hCallWnd[index]==hWnd){
pkWzaf if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I;S[Ft8d hCallWnd[index]=NULL;
Wt"fn&R} HotKey[index]=0;
A<C`JN} HotKeyMask[index]=0;
_O
Tqm5_ bRemoved=TRUE;
&s>HiL>f KeyCount--;
1l"A7
V break;
zC\ pd# }
h1^q};3!W\ }
~ou*'
w@ }
kQxY"HD return bRemoved;
}:5AB93( }
sZ/~pk eva-?+n\q TartV3;` DLL中的钩子函数如下:
(`>RwooE "6Hka{ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
==F[5]? {
R%Gh4y\nF BOOL bProcessed=FALSE;
RX P 0
4 if(HC_ACTION==nCode)
U
N 1HBW; {
: |#Iw if((lParam&0xc0000000)==0xc0000000){// 有键松开
)@DH& switch(wParam)
p6$ QTx
{
z_~5c case VK_MENU:
N 3i,_ MaskBits&=~ALTBIT;
TL ;2,@H` break;
+/*g?Vt case VK_CONTROL:
[cv7s=U% MaskBits&=~CTRLBIT;
(%ra~s? break;
ZRf-V9 case VK_SHIFT:
:vz_f$= MaskBits&=~SHIFTBIT;
.Wv2aJq break;
T^x7w+ default: //judge the key and send message
m646|G5 break;
J*Dj`@`4`g }
-9Wx;u4]o for(int index=0;index<MAX_KEY;index++){
oj /: if(hCallWnd[index]==NULL)
S 0eD
2 continue;
6UXa
5t
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H[#s&Fk2 {
US A!N SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
X2hV)8Sk bProcessed=TRUE;
wrv-"%u) }
?vuM'UH- }
WX&Man!f }
WHk/Rg%< else if((lParam&0xc000ffff)==1){ //有键按下
9JV(}v5[ switch(wParam)
rl qn39 {
=/&ob%J)9] case VK_MENU:
4#MvOjA5[ MaskBits|=ALTBIT;
dVmI.A'nbp break;
PsU.dv[ case VK_CONTROL:
4h\MSTF* MaskBits|=CTRLBIT;
QijEb break;
$m] ~d6 case VK_SHIFT:
+ulBy MaskBits|=SHIFTBIT;
cVv+,l4V0 break;
RbKAB8 default: //judge the key and send message
Mt (wy%{zK break;
.%j(! }
?sWPx!tU for(int index=0;index<MAX_KEY;index++){
r+-KrO' if(hCallWnd[index]==NULL)
Xm`jD'G continue;
-K hXb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
h~)oiT2v {
4vq,W_n.hQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
xwhH_[ bProcessed=TRUE;
2qLRcA=R }
) E.KB6 }
t33/QW
r }
uF_gfjR[m if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
-e_IDE for(int index=0;index<MAX_KEY;index++){
t<mT=(zt* if(hCallWnd[index]==NULL)
t$^1A1Ef continue;
Z[<rz6%cB if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m:CiXM SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
i$gm/ZO //lParam的意义可看MSDN中WM_KEYDOWN部分
r\Nf309~ }
'yxRz5 }
O3WhO@`6) }
9kss)xy return CallNextHookEx( hHook, nCode, wParam, lParam );
:SUPGaUJ" }
0Po",\^ /(
%Q 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
_\waA^ F -Zc
6_]F| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
R L7OFfMe BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
p!BZTwP cf)2GoV>e 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
0(\ybppx NPc]/n?vDj LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
L)H'g {
-L>xVF-|:1 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
"W$,dWF {
fx(^}e //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
L"6qS3 [= SaveBmp();
NPy{ =#k4 return FALSE;
y33+^ }
E:/G!1 …… //其它处理及默认处理
:bFCnV`Q }
3qU#Rg
;7 roT$dL
P)w u~FXO[b 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
jH#Tt; ykcW>h 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
6!7LgM%4 Sd/?xyF1( 二、编程步骤
d~@&*1} HEH Tj,T 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
yo]!Zn EEFM1asJf 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qXPjxTg{[ o5?f]Uq5 , 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Z ?` Mqc" 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
AB<|iJC ?Iy$'am]L 5、 添加代码,编译运行程序。
_ #]uk&5a ^*(*tS|M 三、程序代码
A.tONPi j]th6 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
|6/k2d{,( #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\ cmt'b #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
!wy
Qk #if _MSC_VER > 1000
Y^DS~CrM #pragma once
d#E]>:w9 #endif // _MSC_VER > 1000
5VIc #ifndef __AFXWIN_H__
{`5Sh1b #error include 'stdafx.h' before including this file for PCH
h.CbOI%Q #endif
Wm>[5h%> #include "resource.h" // main symbols
@b[{.mU class CHookApp : public CWinApp
x~p8Mcv {
Im7<\ b@ public:
'F>eieO CHookApp();
"]h4L // Overrides
` b a}6D // ClassWizard generated virtual function overrides
|@#37 //{{AFX_VIRTUAL(CHookApp)
_)s<E9t2N public:
MTJ ."e<B virtual BOOL InitInstance();
'L|& qy@ virtual int ExitInstance();
MzZYzz //}}AFX_VIRTUAL
'q%56WAJ //{{AFX_MSG(CHookApp)
pleLdGq // NOTE - the ClassWizard will add and remove member functions here.
xL8r'gV@ // DO NOT EDIT what you see in these blocks of generated code !
6UK{0\0 //}}AFX_MSG
mYLqT$t.+ DECLARE_MESSAGE_MAP()
`B6~KZ };
l_tr,3_w LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
\HX'^t` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
W"
>[sn| BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
^Xv_y+ BOOL InitHotkey();
?blF6Kl$ BOOL UnInit();
F:nhSd #endif
Ibt~e4f &KinCh7l L //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
PI_MSiYQ #include "stdafx.h"
k L\;90 #include "hook.h"
u!I Es #include <windowsx.h>
sXHrCU #ifdef _DEBUG
T"7Ue #define new DEBUG_NEW
Hl`S\ #undef THIS_FILE
tPu0r],`o static char THIS_FILE[] = __FILE__;
&:1PF.)N #endif
'<!
b}1w0 #define MAX_KEY 100
IvuKpX>* #define CTRLBIT 0x04
ny# ?^.1 #define ALTBIT 0x02
y+b4sFf #define SHIFTBIT 0x01
9gNQ,c
\gT #pragma data_seg("shareddata")
<vxj*M; HHOOK hHook =NULL;
`x=W)o
} UINT nHookCount =0;
zbQ-l1E static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
$="t7C9S static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
~2
L{m[s| static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`4^-@} static int KeyCount =0;
J2A+x\{< static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
k#mQLv #pragma data_seg()
1>hY!nG h HINSTANCE hins;
y/U(v"'4U void VerifyWindow();
g '2'K BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
%04N"^mT'~ //{{AFX_MSG_MAP(CHookApp)
:`('lrq // NOTE - the ClassWizard will add and remove mapping macros here.
MmUtBT // DO NOT EDIT what you see in these blocks of generated code!
vv='.R, D //}}AFX_MSG_MAP
=!}n . END_MESSAGE_MAP()
Uedzt QTZfe<m0 CHookApp::CHookApp()
pxm{?eBz {
%`*`HU#X // TODO: add construction code here,
5G5P#<Vv // Place all significant initialization in InitInstance
zTA+s 2 }
&'%b1CbE ]2O52r CHookApp theApp;
dkTewT6' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
M"cB6{st[ {
JjBG9Rp{ BOOL bProcessed=FALSE;
tA#7Xr+ if(HC_ACTION==nCode)
/S4$qr cM {
^{z@=o<o if((lParam&0xc0000000)==0xc0000000){// Key up
FR%9Qb7 switch(wParam)
9A|deETa- {
b|
e7mis@ case VK_MENU:
-+1_ 1! MaskBits&=~ALTBIT;
{+D
6o break;
\#1*r'V8 case VK_CONTROL:
TL^af- MaskBits&=~CTRLBIT;
ahezDDR-.i break;
zj~(CNE case VK_SHIFT:
&8kc0Z@y MaskBits&=~SHIFTBIT;
y"N7r1Pf break;
q. zBm@: default: //judge the key and send message
.KzGb4U break;
oW0A8_|9 }
|%wgux`z for(int index=0;index<MAX_KEY;index++){
w5j6RQml if(hCallWnd[index]==NULL)
m}t.E continue;
syuW>Z8s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
SZ/}2_; {
$bf&ct*$h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
=+I~K'2 bProcessed=TRUE;
K})=&<M0 }
c!,&]*h"k }
+w'"N }
T{9pNf- else if((lParam&0xc000ffff)==1){ //Key down
j$2rU' switch(wParam)
z ^e99dz {
`2}Frw+? case VK_MENU:
fW/G_ MaskBits|=ALTBIT;
ixK&E#
break;
XUI9)Ne case VK_CONTROL:
$-HP5Kj(k- MaskBits|=CTRLBIT;
F0yvV6; break;
g43j-[j) case VK_SHIFT:
,tt
.oF|
MaskBits|=SHIFTBIT;
5m.{ayE break;
N^G
$:GC default: //judge the key and send message
_(#HQd,i break;
<K^{36h }
HC%tJ:G for(int index=0;index<MAX_KEY;index++)
$0uh8RB {
RK7vR~kf< if(hCallWnd[index]==NULL)
wjJM\BKr` continue;
wR7Ja
cKv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C*+gQeK {
L5+X& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
R`IFKmA EJ bProcessed=TRUE;
nFRU-D$7 }
x,CTB }
79DzrLu }
S5Hb9m&& if(!bProcessed){
}rWEa^ for(int index=0;index<MAX_KEY;index++){
=H<I` J' if(hCallWnd[index]==NULL)
*=sMJY9#jE continue;
x,U'!F if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
0_!')+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Ry$zF~[ }
\a_75^2 }
e(e_p# }
x.5!F2$ return CallNextHookEx( hHook, nCode, wParam, lParam );
LB(I^ }
\&{a/e2:S M2pe*z BOOL InitHotkey()
>9WJa 5{ {
UN
FQ`L if(hHook!=NULL){
Q9i&]V[` nHookCount++;
qocN:Of1 return TRUE;
E{Kc$,y }
$nkvp`A else
_H,xnh#nZ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
>MTrq%. if(hHook!=NULL)
Ofx] nHookCount++;
kp6{QKDj& return (hHook!=NULL);
3/aK#TjK }
1*x;jO>Hk BOOL UnInit()
I]4L0r- {
PRdyc+bf if(nHookCount>1){
65% WjO nHookCount--;
lx'^vK% F return TRUE;
} @)r\t4m }
Li'>pQ+ BOOL unhooked = UnhookWindowsHookEx(hHook);
Z<yLu'48)A if(unhooked==TRUE){
vz$_Fgsc. nHookCount=0;
{^5LolCCH hHook=NULL;
Wz8MV -D }
|)Q#U$ m return unhooked;
6#J>b[Q }
yt5Sy N$!aP/b BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*?JNh; {
1Fg*--8[r BOOL bAdded=FALSE;
f:\)oIW9Kk for(int index=0;index<MAX_KEY;index++){
Cr7T=&L if(hCallWnd[index]==0){
8[k:FGp> hCallWnd[index]=hWnd;
OV"uIY[%8V HotKey[index]=cKey;
$fzO:br5WJ HotKeyMask[index]=cMask;
'%H\k5^ bAdded=TRUE;
zu,F 0;De KeyCount++;
<M
y+!3\A break;
iBM;$0Y }
wHT]&fZ }
{4y#+[ return bAdded;
?W3l }
mTj?W$+r D<QE?:# BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<dD)>Y. {
r6b;v2!8 BOOL bRemoved=FALSE;
cXd?48O for(int index=0;index<MAX_KEY;index++){
t'e\Z2 if(hCallWnd[index]==hWnd){
[ ,&O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Irc(5rD7 hCallWnd[index]=NULL;
~pC\"LU` HotKey[index]=0;
JK/gq}c HotKeyMask[index]=0;
9n#lDL O bRemoved=TRUE;
ppP0W`p KeyCount--;
R<L<kChg break;
x 8/I"!gI }
LmZ"_ }
0|}]=XN^ }
"c5bz return bRemoved;
61 @;3yV }
pBxyq"z W5^<4Ya! void VerifyWindow()
${F4x "x {
fvi8+3A& for(int i=0;i<MAX_KEY;i++){
4lF(..Ix if(hCallWnd
!=NULL){ rqi/nW
if(!IsWindow(hCallWnd)){ FK+`K<
hCallWnd=NULL; s=H|^v
HotKey=0; ubQbEv{(,
HotKeyMask=0; WAUgbImc{
KeyCount--; Xl %ax!/
} ?'IY0^
}
Tb[1\
} z[sP/{~z
} k9_c<TSzu
Ncr*F^J4
BOOL CHookApp::InitInstance() YAsE,M+
{ =j~vL`d2]
AFX_MANAGE_STATE(AfxGetStaticModuleState()); a/{M2
hins=AfxGetInstanceHandle(); VR XK/dZ
InitHotkey(); P?o|N<46
return CWinApp::InitInstance(); T!%J x.^
} :pCv!g2
nJhaI
int CHookApp::ExitInstance() c9:8KMF)
{ ~QngCg-5q
VerifyWindow(); Fl}{"eCF8
UnInit(); Fz {T;
return CWinApp::ExitInstance(); i}gsxq%
} KK';ho,W
#8/pYQ;
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V^%P}RFMc
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }pJLK\
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ asZ(Hz%
#if _MSC_VER > 1000 EXEB A&*
#pragma once \(&UDG$
#endif // _MSC_VER > 1000 GWa:C\YK
?0x=ascP
class CCaptureDlg : public CDialog -d4|EtN
{ H7{I[>:
// Construction 928uGo5
public: ]99@Lf[^f
BOOL bTray; EdTR]}8
BOOL bRegistered;
B2^*Sr[
BOOL RegisterHotkey(); ^oMdx2Ow#
UCHAR cKey; T9\G,;VQ7/
UCHAR cMask; DS|q(O=7~t
void DeleteIcon(); OsV'&@+G>
void AddIcon(); Y[rRz6.*(
UINT nCount; FaLc*CU
void SaveBmp(); s4[PwD
CCaptureDlg(CWnd* pParent = NULL); // standard constructor A&S n^mw
// Dialog Data yi;pn Z
//{{AFX_DATA(CCaptureDlg) *6aIDFNl
enum { IDD = IDD_CAPTURE_DIALOG }; (b8ZADI*
CComboBox m_Key; 'Bwv-J
BOOL m_bControl; [.'9Sw
BOOL m_bAlt; P$zhMnAAN
BOOL m_bShift; hf\/2Vl
CString m_Path; LDY3Ya`6m
CString m_Number; hjq@.5
//}}AFX_DATA *t300`x
// ClassWizard generated virtual function overrides 0=k
//{{AFX_VIRTUAL(CCaptureDlg) 1\Z/}FT
public: E1D0un
virtual BOOL PreTranslateMessage(MSG* pMsg); /8wfI_P>M"
protected: ?k^~qlye
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b8LA|#]i
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4x-K0
//}}AFX_VIRTUAL yVe<+Z\7
// Implementation dK41NLGQ
protected: /RI"a^&9A
HICON m_hIcon; k`BS{,=
// Generated message map functions _t>[gB,
//{{AFX_MSG(CCaptureDlg) l\WN
virtual BOOL OnInitDialog(); 3}lIY7O
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V-9\@'gc
afx_msg void OnPaint(); ?|Ey WAL
afx_msg HCURSOR OnQueryDragIcon(); UaB2vuL*=
virtual void OnCancel(); j@R"AP}
afx_msg void OnAbout(); * .g[vCy
afx_msg void OnBrowse(); oFKTBH:I
afx_msg void OnChange(); xEg@Y"NQ
//}}AFX_MSG NwN3T]W
DECLARE_MESSAGE_MAP() PsM8J
}; 3qkPe_<I
#endif Z~]G+(
'fYF1gR4
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #$;}-*
#include "stdafx.h" ^/I.? :+
#include "Capture.h" ~3)d?{5
#include "CaptureDlg.h" ~;}uYJ
#include <windowsx.h> 8?1MnjhX10
#pragma comment(lib,"hook.lib") 6^)eW+
#ifdef _DEBUG {_4`0J`3
#define new DEBUG_NEW >en\:pJn)'
#undef THIS_FILE On0,#i=
static char THIS_FILE[] = __FILE__; av bup
#endif j&[u$P*K
#define IDM_SHELL WM_USER+1 ~KczP1p
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3e9UD N2
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m=25HH7enb
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^% L;FGaA
class CAboutDlg : public CDialog hi/Z>1ZOX
{
(aLjW=
public: mD%IHzbn
H
CAboutDlg(); [Z^26/5a
// Dialog Data 7Vuf4Z5
//{{AFX_DATA(CAboutDlg) Fj46~#ZZ
enum { IDD = IDD_ABOUTBOX }; LqLhZBU9
//}}AFX_DATA 29zMs9oKPP
// ClassWizard generated virtual function overrides \U<d)j/
//{{AFX_VIRTUAL(CAboutDlg) 5w%[|%KG:L
protected: VRTJKi
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z23T2
//}}AFX_VIRTUAL [6Q1yNE
// Implementation $Gcjm~
protected: Dutc#?bT
//{{AFX_MSG(CAboutDlg) PZVH=dagq
//}}AFX_MSG p6&<eMwFA
DECLARE_MESSAGE_MAP() yxi&80$
}; %, S{9q
o]WcODJdl
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y>cLG5v
{
#jsN
//{{AFX_DATA_INIT(CAboutDlg) Bus]OF>hu
//}}AFX_DATA_INIT 4dy!2KZN
} P`avn
-f*5lkO
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5"ooam3
{ ..5.":
CDialog::DoDataExchange(pDX); RXw1HRR$V
//{{AFX_DATA_MAP(CAboutDlg) 1bjz :^
//}}AFX_DATA_MAP CF:L#r
} S f6%A
z<%dWz
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E;,__
//{{AFX_MSG_MAP(CAboutDlg) -d-xsP}
s
// No message handlers Q.fUpa v
//}}AFX_MSG_MAP Q5A,9ovNZ
END_MESSAGE_MAP() G'`^U}9V\
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) uAs!5h
: CDialog(CCaptureDlg::IDD, pParent) (b.4&P"0
{ UCj:]!P
//{{AFX_DATA_INIT(CCaptureDlg) _GM?`
m_bControl = FALSE; >
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m_bAlt = FALSE; P 5.@LN
m_bShift = FALSE; OO</d:
m_Path = _T("c:\\"); xUNq!({T
m_Number = _T("0 picture captured."); 5gkQ6&m
nCount=0; d|8-#.gV
bRegistered=FALSE; -q8l"i>h=
bTray=FALSE; ^j2ve's:
//}}AFX_DATA_INIT L c
)i
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >cpv4Pgm
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); j3H_g^
} z]KJ4
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) eSHsE3}h
{ {|<yZ,,p
CDialog::DoDataExchange(pDX); 7rYBFSp
//{{AFX_DATA_MAP(CCaptureDlg) 5V~vND*
s
DDX_Control(pDX, IDC_KEY, m_Key); 'h^Ya?g
DDX_Check(pDX, IDC_CONTROL, m_bControl); L)4~:f)B
DDX_Check(pDX, IDC_ALT, m_bAlt); @t0T+T3
DDX_Check(pDX, IDC_SHIFT, m_bShift); |Qcj+HH.
DDX_Text(pDX, IDC_PATH, m_Path); UFLx'VXd
DDX_Text(pDX, IDC_NUMBER, m_Number); `PUxR8y
//}}AFX_DATA_MAP s}-j.jzB{
} $j8CF3d.6
6=Wevb5YJ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (P=WKZMPN
//{{AFX_MSG_MAP(CCaptureDlg) zg'.f UZ
ON_WM_SYSCOMMAND() [#YzU^^Ib
ON_WM_PAINT() e"*1l>g
ON_WM_QUERYDRAGICON() $:# :"
ON_BN_CLICKED(ID_ABOUT, OnAbout) w~:F?
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6(x53y__
ON_BN_CLICKED(ID_CHANGE, OnChange) aXzb]">
//}}AFX_MSG_MAP vxug>2
END_MESSAGE_MAP() =qbN?a/?2
VFMn"bYOB
BOOL CCaptureDlg::OnInitDialog() 1GIBqs~-
{ X&h?1lMJ /
CDialog::OnInitDialog(); PVIZ
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ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); q[+h ~)
ASSERT(IDM_ABOUTBOX < 0xF000); G
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CMenu* pSysMenu = GetSystemMenu(FALSE); NEPK
if (pSysMenu != NULL) D>;_R
HK
{ "shX~zd5
CString strAboutMenu; H:OpS-b
strAboutMenu.LoadString(IDS_ABOUTBOX); s5 {B1e
if (!strAboutMenu.IsEmpty()) m9\"B3sr
{ X
@pm !c#
pSysMenu->AppendMenu(MF_SEPARATOR); :R3iLy
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *B\ @L
} 6 !?]
(
} Ekik_!aB
SetIcon(m_hIcon, TRUE); // Set big icon Zy.A9Bh~
SetIcon(m_hIcon, FALSE); // Set small icon 8aC=k@YE
m_Key.SetCurSel(0); _n!>*A!
RegisterHotkey(); mIp> ~
CMenu* pMenu=GetSystemMenu(FALSE); ~:PM_o*6
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oO`a {n-
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4)>UTMF
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %Ofw"W
return TRUE; // return TRUE unless you set the focus to a control .t8hTlV?<B
} w<zzS:PF*
,qo^G0XO
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mXS"nd30bD
{ R'6(eA[K
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ihr[44#
{ +> d;%K
CAboutDlg dlgAbout; >8x)\'w
dlgAbout.DoModal(); /d">}%Jn
} m @lUJY
else %#PWD7a\
{ ^TjC
CDialog::OnSysCommand(nID, lParam); r> Xk1~<!
} 9W+DW_M
} _cC1u7U9
mdQe)>
void CCaptureDlg::OnPaint() .C5<uW5-R
{ n~BQq-1
if (IsIconic()) SIKaDIZ
{ Hz[1c4)'F
CPaintDC dc(this); // device context for painting Yk)fBPHr
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8DMqjt3B
// Center icon in client rectangle $G 6kS@A
int cxIcon = GetSystemMetrics(SM_CXICON); D!#B*[|
int cyIcon = GetSystemMetrics(SM_CYICON); UjLq[,_!
CRect rect; BOR$R}q
GetClientRect(&rect); g kV`ZT9
int x = (rect.Width() - cxIcon + 1) / 2; [s\8@5?E
int y = (rect.Height() - cyIcon + 1) / 2; c0HPS9N\
// Draw the icon tC oE4Ed
dc.DrawIcon(x, y, m_hIcon); p&u\gSo
} =cb!2%?}
else 5O]ZX3z>
{ WNb2"W
CDialog::OnPaint(); \x:U`T
} e=p_qhBt
} Vgkj4EE
N6p0`
HCURSOR CCaptureDlg::OnQueryDragIcon() )V+/@ 4
{ xLLTp7b(
return (HCURSOR) m_hIcon; 'p\&Mc_Gu
} Cg%Owe/E?0
ki }Li*)7
void CCaptureDlg::OnCancel() Y~Vc|zM^(
{ |pbetA4&
if(bTray) _(~LXk^C
DeleteIcon(); Y2tBFeWY
CDialog::OnCancel(); !4gHv4v;
} n[r1h=?j3
*JZ9'|v_H
void CCaptureDlg::OnAbout() v _:KqdmO]
{ ?b'(39fj
CAboutDlg dlg; `8#xO{B1
dlg.DoModal(); xdDe@G;"
} ]dl.~;3~~
"PWGtM:L8Y
void CCaptureDlg::OnBrowse() -P-8D6
{ 0u&x%c
CString str; RRYcg{g
BROWSEINFO bi; w-$iKtb.
char name[MAX_PATH]; (x@J@ GP*
ZeroMemory(&bi,sizeof(BROWSEINFO)); TuPD5-wB&
bi.hwndOwner=GetSafeHwnd(); F|/6;&*?M
bi.pszDisplayName=name; ;@Z1y
bi.lpszTitle="Select folder"; lj8ficANo
bi.ulFlags=BIF_RETURNONLYFSDIRS; S!x;w7j
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?azLaAG
if(idl==NULL) RJd*(!y
return; 5-k gGOt
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); _
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str.ReleaseBuffer(); #`=>Mza
m_Path=str; AS:k&t
if(str.GetAt(str.GetLength()-1)!='\\') :?= 1aiS
m_Path+="\\"; JY"J}
UpdateData(FALSE); /.rj\,
} 92R,o'#
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void CCaptureDlg::SaveBmp() 6(t'B!x
{ CS*lk!C
CDC dc; [`E_/95
dc.CreateDC("DISPLAY",NULL,NULL,NULL); [McH l1a
CBitmap bm; H^`J(J+
int Width=GetSystemMetrics(SM_CXSCREEN); ])bgUH
int Height=GetSystemMetrics(SM_CYSCREEN); #Tag"b`
bm.CreateCompatibleBitmap(&dc,Width,Height); Wd(|w8J{a
CDC tdc; \fSruhD
tdc.CreateCompatibleDC(&dc); vN@04a\h
CBitmap*pOld=tdc.SelectObject(&bm); N+5f.c+S-
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {R[ V
tdc.SelectObject(pOld); RhT:]
BITMAP btm; =h=-&DSA
bm.GetBitmap(&btm); `1Md1e:J
DWORD size=btm.bmWidthBytes*btm.bmHeight; sh0x<_
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Q%!xw(
BITMAPINFOHEADER bih; 7<(U`9W/q
bih.biBitCount=btm.bmBitsPixel; hH-!3S2'
bih.biClrImportant=0; 59:kL<;S-
bih.biClrUsed=0; Q>;Aq!mr=
bih.biCompression=0; W> Pcj EI
bih.biHeight=btm.bmHeight; 4T"L#o1
bih.biPlanes=1; r8N)]HsZH
bih.biSize=sizeof(BITMAPINFOHEADER); )ezkp%I5D
bih.biSizeImage=size; r3OtQ
bih.biWidth=btm.bmWidth; `*yOc6i]
bih.biXPelsPerMeter=0; _Gb7n5p
bih.biYPelsPerMeter=0; ,1!Y!,xy
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Wnp[8IEU
static int filecount=0; X|g5tnsj`
CString name; qC& xuu|
name.Format("pict%04d.bmp",filecount++);
.#a7?LUH
name=m_Path+name; |a /cw"
BITMAPFILEHEADER bfh; %iYro8g!,
bfh.bfReserved1=bfh.bfReserved2=0; +!`$(
bfh.bfType=((WORD)('M'<< 8)|'B'); Ln+ k_
bfh.bfSize=54+size; *!Gb_!98
bfh.bfOffBits=54; ;[g~h |{6
CFile bf; A,4}
$-7
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =z<sx2#*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `'mRGz7t
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v$q\3#5|'
bf.WriteHuge(lpData,size); DIvxut
bf.Close(); ?vF8 y;Jh
nCount++; (r'NB
} )PkGT~3I
GlobalFreePtr(lpData); )[&j&AI
if(nCount==1) Dk")/ ib
m_Number.Format("%d picture captured.",nCount); -sle7 k
else zH~g5xgh
m_Number.Format("%d pictures captured.",nCount); Kuk@x.~0m
UpdateData(FALSE); }095U(@
} ov\%*z2=
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :'fK`G
6
{ {+kWK;1
if(pMsg -> message == WM_KEYDOWN) L+lye Ir'
{ AGVipI #
if(pMsg -> wParam == VK_ESCAPE) aK,\e/Oo
return TRUE; m{lS-DlRg
if(pMsg -> wParam == VK_RETURN) 6 {3q l:
return TRUE; 9NU-1vd~
} TC:t!:
return CDialog::PreTranslateMessage(pMsg); 4zBcq<R7
} ;t@^Z_z,CR
d)$seZB
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K
#JO#
{ {cw+kY]m4-
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eR3MU]zF
SaveBmp(); ,d=Dicaz
return FALSE; b+CvA(*
} gKPqU @$*
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z yz)`>cB
CMenu pop; iq8Hq)I]
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *s2 C+@ef
CMenu*pMenu=pop.GetSubMenu(0); 1'k,P;s
pMenu->SetDefaultItem(ID_EXITICON); =)Goip
CPoint pt; ::/vDUDc
GetCursorPos(&pt); y>g`R^^
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); x^pHP|<3`
if(id==ID_EXITICON) g$#JdN
DeleteIcon(); (Fk&~/SP
else if(id==ID_EXIT) Ye>+
OnCancel();
)$2h:dw_
return FALSE;
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} 4%TmW/yd
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2qKAO/_O
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) G#'G9/Tm
AddIcon(); *vzj(HGO
return res; '}P$hP_d
} R_:-Z.
h#|A c>fz
void CCaptureDlg::AddIcon() sNC~S%[
{ VOp+6ho<
NOTIFYICONDATA data; ve(@=MJ
data.cbSize=sizeof(NOTIFYICONDATA); e#tWQM3
CString tip; y#lg)nB
tip.LoadString(IDS_ICONTIP); w/CD-
data.hIcon=GetIcon(0); jSvo-
data.hWnd=GetSafeHwnd(); "fd'~e$S#
strcpy(data.szTip,tip); <bBgevL+_K
data.uCallbackMessage=IDM_SHELL; !t&C,@Ox
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <L3ig%#B
data.uID=98; KVpQ,x&q~
Shell_NotifyIcon(NIM_ADD,&data); 8RVeKnpXTV
ShowWindow(SW_HIDE);
t;[?Q\
bTray=TRUE; 0LUw
} -kzg(+sm
3HX-lg`0
void CCaptureDlg::DeleteIcon() v%Su#xq/
{ NbhQ-
NOTIFYICONDATA data; 6uWPIM;
data.cbSize=sizeof(NOTIFYICONDATA); #j"N5e}U
data.hWnd=GetSafeHwnd(); ^c>ROpic
data.uID=98; AiV1
vD`
Shell_NotifyIcon(NIM_DELETE,&data); X,+N/nku
ShowWindow(SW_SHOW); Otm7j>w
SetForegroundWindow(); "I[uD)$
ShowWindow(SW_SHOWNORMAL); {_J1m&/
bTray=FALSE; NUX2{8gs
} [\ppK C
H^w Inkf>
void CCaptureDlg::OnChange() l`AA<Rj*O-
{ Be0v&Q_NK
RegisterHotkey(); |DoD.?v
} ,#80`&\%
_,|N`BBqd
BOOL CCaptureDlg::RegisterHotkey() a[V4EX1E
{ YR68'Sft[
UpdateData(); GG`;c?d@
UCHAR mask=0; =xHzhh
UCHAR key=0; 7C^W <SUo
if(m_bControl) '\B!1B>T
mask|=4; +}!FP3KgT
if(m_bAlt) AaJnRtBS~
mask|=2; xy<)zKp
if(m_bShift) ^g N?Io
mask|=1; s!K9-qZl<
key=Key_Table[m_Key.GetCurSel()]; K9euNa
if(bRegistered){ zzyD'n7D
DeleteHotkey(GetSafeHwnd(),cKey,cMask); !X/O1PM|
bRegistered=FALSE; [S T7CrwC
} VaylbYUCT/
cMask=mask; }kb6;4>c
cKey=key; A ]~%<=b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >]l7AZ:,
return bRegistered; Gv}~
} e{IwFX
IgtTYxI
四、小结 J
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U^xtS g
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。