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:
Bj@&c>
@Cz1rKU^l 一、实现方法
n8:2Z> SCGQo.~, 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:
"hy#L
0\t tmb0zuJ&C! #pragma data_seg("shareddata")
cst=ms HHOOK hHook =NULL; //钩子句柄
~gBqkZ# y? UINT nHookCount =0; //挂接的程序数目
KJ9~"v
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
U]R7= static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
29av8eW?3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
0
?2#SM static int KeyCount =0;
^xqh! static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
NoKYHN^*w #pragma data_seg()
C{2UPG4 x 57[O)5u.+ 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。
l }:jXl!: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:
\[D"W{9l koqH~>ZtD BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
(1Kh9w:^" cKey,UCHAR cMask)
G 8NSBaZe {
.S5&MNE BOOL bAdded=FALSE;
eGguq~s` for(int index=0;index<MAX_KEY;index++){
,%,}[q?]d if(hCallWnd[index]==0){
/1OhW>W3eH hCallWnd[index]=hWnd;
~&yaIuW< HotKey[index]=cKey;
~?L. n:wu HotKeyMask[index]=cMask;
;$%+TN bAdded=TRUE;
.5I1wRN49 KeyCount++;
Q7DkhKT break;
Q0 ^?jh }
\7/xb{z| }
90ORx\Oeo return bAdded;
99ZQlX }
G7),!Qol //删除热键
M~"K@g=Wr BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
I`y}Ky<q {
/\=g;o' BOOL bRemoved=FALSE;
z!F?#L5 for(int index=0;index<MAX_KEY;index++){
FD`V39## if(hCallWnd[index]==hWnd){
;XTP^W!6f if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
J7l1- hCallWnd[index]=NULL;
ml3]CcKn HotKey[index]=0;
9^aMmN&6N2 HotKeyMask[index]=0;
n=yFw\w' bRemoved=TRUE;
c3Mql+@ KeyCount--;
"C0oFRk break;
: 0%V:B }
U|y+k` }
|~Z+Xla }
7%?A0%>6G return bRemoved;
IB?5y~+h }
4~Z\tP|Q. 4W1"=VL[g 2} T"|56 DLL中的钩子函数如下:
M<)HJ lr 2?m'Dy'JE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
4K4?Q+? {
+:^tppg BOOL bProcessed=FALSE;
^WVr@6 if(HC_ACTION==nCode)
ci*Z9&eS+ {
[1Vh3~>J6 if((lParam&0xc0000000)==0xc0000000){// 有键松开
K\;b3 switch(wParam)
0mCrA|A. {
fwOvlD&e case VK_MENU:
FfP Ce5) MaskBits&=~ALTBIT;
.ipYZg'V break;
km8[azB o case VK_CONTROL:
O@EpRg1 MaskBits&=~CTRLBIT;
g y&B"` break;
c"fnTJXr79 case VK_SHIFT:
>-]Y%O;} MaskBits&=~SHIFTBIT;
#Ok*Or break;
*%Q!22?6F default: //judge the key and send message
v+Ooihxl break;
6{1c
S }
K72U0}$B for(int index=0;index<MAX_KEY;index++){
QZzi4[-as if(hCallWnd[index]==NULL)
#,$d!l @ continue;
` NcWy if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r6j
3A {
&{"aD& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
k+%6:r,r& bProcessed=TRUE;
` 8.d }
,qt9S0QS }
VBsS1!g }
K~C*4H:9 else if((lParam&0xc000ffff)==1){ //有键按下
l*/I ;a$ switch(wParam)
rr2|xL?+u {
wD"Y1?Mr case VK_MENU:
-Vw,9VCF MaskBits|=ALTBIT;
@R>J\> break;
@e+QGd;} case VK_CONTROL:
K^w(WE;db MaskBits|=CTRLBIT;
C:z K{+ break;
lcyan case VK_SHIFT:
kcI3pmgj MaskBits|=SHIFTBIT;
2et7Vw break;
c`AtKs)u default: //judge the key and send message
h_Q9c break;
E_7N^htv }
oJ>]=^?k for(int index=0;index<MAX_KEY;index++){
quVTqhg" if(hCallWnd[index]==NULL)
A2g+m continue;
kC0F@'D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&+d>xy\^/ {
)<t5' +d% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K`768%q bProcessed=TRUE;
WOG=Uy$ }
`/8Dmg }
n<uF9N< }
9}jF]P*Q if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
PiP\T.XANa for(int index=0;index<MAX_KEY;index++){
uI!rJc>TX if(hCallWnd[index]==NULL)
vc5g4ud continue;
(%YFcE)SRS if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{-09,Q4[& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-:dUD1 //lParam的意义可看MSDN中WM_KEYDOWN部分
j0~]o})@i }
w:#yu }
vzd1:'^t }
:q<8:,rP return CallNextHookEx( hHook, nCode, wParam, lParam );
>PGW>W$ }
db'Jl^ tQ&.;{5[f 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:
:na9PW`TC nGZZCsf < BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
yL7D;<!S& BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4U*J{''L Np$pz 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
O=?WI
`<cB 6 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
(i^{\zv {
4RGEg;]S if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
rzsb( {
tXV9+AJ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1>r7s* SaveBmp();
g[!t@K return FALSE;
N0,wT6. }
R'`q0MoN1 …… //其它处理及默认处理
0GK<l }
0&mOu #l 7Ps I'1v y-w=4_W 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
8*-8"It<" 1JMEniB+9 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
*7u~` L0H;y6& 二、编程步骤
w7@fiH{ ;}"_hLX 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
B"rnSui 8QDs4Bv| 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
xb1 i{d tpOMKh.` 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
rJ|Q%utYz u.ubw(vv 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
qpjtF' A[`c2v-hF 5、 添加代码,编译运行程序。
2oyTS*2u_& #9M6 q 三、程序代码
4wk-f7I( |WqEJ*$, ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
1BO$xq #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
+[Cdd{2 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
rH
Et]Xa #if _MSC_VER > 1000
Dvbrpn!sk #pragma once
m7}PJ^*b #endif // _MSC_VER > 1000
(N{Rda*8 #ifndef __AFXWIN_H__
e=ZwhRP #error include 'stdafx.h' before including this file for PCH
G-
wQ
weJ9 #endif
o=@0Bd8 #include "resource.h" // main symbols
3C'`K, class CHookApp : public CWinApp
&D0suK# {
exT
O#*o public:
K=T]@ix$ CHookApp();
Whp;wAz // Overrides
.@KpN*`KH // ClassWizard generated virtual function overrides
0goKiPx //{{AFX_VIRTUAL(CHookApp)
+EK(r@eV public:
IA_>x9 (~ virtual BOOL InitInstance();
erTb9`N4 virtual int ExitInstance();
acr@erk //}}AFX_VIRTUAL
y"q7Gx*^j //{{AFX_MSG(CHookApp)
/)fx(u# // NOTE - the ClassWizard will add and remove member functions here.
x dDR/KS // DO NOT EDIT what you see in these blocks of generated code !
9DcUx- //}}AFX_MSG
f0H
5 )DJf DECLARE_MESSAGE_MAP()
k.=67L };
=+;1^sZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
-wv5c BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\)Jv4U\; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%{qJkjG BOOL InitHotkey();
uis;S)+ BOOL UnInit();
:a$ZYyD #endif
$Gt1T[:QUX f[v~U<\R //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
(}E-+:vFU #include "stdafx.h"
HgL*/d #include "hook.h"
v\7k #include <windowsx.h>
zWvG];fsN #ifdef _DEBUG
]yu,YZ@7 #define new DEBUG_NEW
BkfWZ O{7 #undef THIS_FILE
]=ar&1}J static char THIS_FILE[] = __FILE__;
0_b7*\x c #endif
c*MSd #define MAX_KEY 100
^ei[#I #define CTRLBIT 0x04
eveGCV;@ #define ALTBIT 0x02
nsR^TD;
#define SHIFTBIT 0x01
h
$)thW #pragma data_seg("shareddata")
lsmzy_gV7 HHOOK hHook =NULL;
fq-$u;~h UINT nHookCount =0;
7+]T}4; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
tMGkm8y-A static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
<jdS0YT static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
aIaydu+ \ static int KeyCount =0;
KI (9TI* static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
SPKen}g #pragma data_seg()
AU1P?lk HINSTANCE hins;
B@!a@0,,_ void VerifyWindow();
_i [.5 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
R<W#.mpo6 //{{AFX_MSG_MAP(CHookApp)
INwc@XB // NOTE - the ClassWizard will add and remove mapping macros here.
K@xp! // DO NOT EDIT what you see in these blocks of generated code!
EN@LB2 //}}AFX_MSG_MAP
N{n}]Js1D- END_MESSAGE_MAP()
Yh/-6wg -x
)(2| CHookApp::CHookApp()
G3QB Rh{ {
qmUq9bV // TODO: add construction code here,
js
)G // Place all significant initialization in InitInstance
}%k,PYe/ }
1xK'T_[ wqo2iRql CHookApp theApp;
2=tPxO')B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
rN?
L8 {
=!NYvwg6;o BOOL bProcessed=FALSE;
=DTn9}u if(HC_ACTION==nCode)
GEP YSp {
X70 vDoW if((lParam&0xc0000000)==0xc0000000){// Key up
z79L2lJn switch(wParam)
p}uTqI {
u&l2s&i case VK_MENU:
+T[3wL~ MaskBits&=~ALTBIT;
,u QLXF2 break;
X?$Eb case VK_CONTROL:
Lc^nNUzPo MaskBits&=~CTRLBIT;
QQ@, v@j5 break;
R7T"fN case VK_SHIFT:
}4xxge?r MaskBits&=~SHIFTBIT;
L]0+u\( break;
RLY Ae default: //judge the key and send message
`9Ngax=_ break;
(omdmT%D }
9\TvX!)h for(int index=0;index<MAX_KEY;index++){
><OdHRh@# if(hCallWnd[index]==NULL)
aq"E@fb continue;
)<4o"R:* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GSV, {
T,(IdVlJ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
bf3LNV| bProcessed=TRUE;
'.~vN L+
O }
[$3Zid }
O89<IXk }
f4s[R0l else if((lParam&0xc000ffff)==1){ //Key down
H_;Dq* switch(wParam)
WlP@Tm5g/ {
`6j?2plZ case VK_MENU:
4M(w<f\5F MaskBits|=ALTBIT;
P,h@F+OZN break;
&.kg8|s{ case VK_CONTROL:
F-k1yZ?^ MaskBits|=CTRLBIT;
#Vn=(U4}!_ break;
?-<t-3%hyV case VK_SHIFT:
@babgP, MaskBits|=SHIFTBIT;
$qQ6u! break;
V2w[0^L default: //judge the key and send message
{z@vSQ=)=P break;
H#U{i }
i40r}?- for(int index=0;index<MAX_KEY;index++)
&:]_a?|*S {
o)}b Fw if(hCallWnd[index]==NULL)
4)2*|w continue;
Ms1\J2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
* VW\ {
ygpC1nN SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
d;lp^K
M bProcessed=TRUE;
MBcOIy[&A }
XP2=x_"y }
2!68W
X }
+6<MK; if(!bProcessed){
LDV{#5J for(int index=0;index<MAX_KEY;index++){
\07Vh6cj if(hCallWnd[index]==NULL)
}J`{g/ continue;
2l5@gDk5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[%l+
C~m SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
58e{WC }
Zy*}C,Z }
3{M IBMA }
w#PaN83+ return CallNextHookEx( hHook, nCode, wParam, lParam );
WS(@KN }
m OmT]X N0
?O*a BOOL InitHotkey()
Rz=]KeZu {
|w~zh6~ if(hHook!=NULL){
rLL;NTN+/ nHookCount++;
]v_xEH}T return TRUE;
MW*}+ PCY }
iXl1S[.l else
DA@
{ d-A hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
[&3"kb if(hHook!=NULL)
NlcWnSv nHookCount++;
,7%(Jj$
^ return (hHook!=NULL);
;o^m"I\y }
G#@<bg3 BOOL UnInit()
;k/0N~ {
P\zi:]h[Gh if(nHookCount>1){
n+uq|sYVa nHookCount--;
)1x333.[c return TRUE;
(OG@]|- }
/-|xxy BOOL unhooked = UnhookWindowsHookEx(hHook);
$ @1&G~x if(unhooked==TRUE){
`SW`d<+L nHookCount=0;
eHnC^W}|s hHook=NULL;
MeplM$9 }
{{EQM
+ return unhooked;
q6_1`Ew }
gu:..'V ;'o>6I7Ph BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?N|PgNu X {
@XIwp2A{+ BOOL bAdded=FALSE;
'.kbXw0} for(int index=0;index<MAX_KEY;index++){
*;gi52tM if(hCallWnd[index]==0){
?,%N? hCallWnd[index]=hWnd;
HYg_{ HotKey[index]=cKey;
xD1wHp!+ HotKeyMask[index]=cMask;
Y(A?ib~K bAdded=TRUE;
|g;XC^!%=o KeyCount++;
sJM}p5V break;
,RT\&Ze5 }
5<a<!]|C }
IB;y8e, return bAdded;
hcf>J6ZLT }
*n[Fl
@~N#)L^ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"t\9@nzdX {
IS=)J( 0 BOOL bRemoved=FALSE;
QM _~w\ for(int index=0;index<MAX_KEY;index++){
H+ M~|Ju7 if(hCallWnd[index]==hWnd){
Ppp&3h[dW) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&Y#9~$V= hCallWnd[index]=NULL;
HE,wEKp HotKey[index]=0;
}Ql;% 7 HotKeyMask[index]=0;
Ahwu'mgnC bRemoved=TRUE;
Tf[]vqa`G KeyCount--;
A6U6SvM; break;
bg=`
}
?b7vc^E& }
gTQ6B,`/8 }
QB@*/Le return bRemoved;
UNAuF8>K }
jyT(LDsS 1bDc ct void VerifyWindow()
]D]K_`!K {
eb8_guZ for(int i=0;i<MAX_KEY;i++){
Q@j:b]Y9 if(hCallWnd
!=NULL){ q{5Vq_s\
if(!IsWindow(hCallWnd)){ oDP|>yXC)
hCallWnd=NULL; }`g*pp*
HotKey=0; Anm5Cvt;i
HotKeyMask=0; Ux<h`
s
KeyCount--; Fwqv1+
} T(}da**X
} kN) pi "
} *lTu-
} JC+VG;kcs
w'eenIX^^
BOOL CHookApp::InitInstance() QMsnfG
{ (J;?eeP
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 50Jr(OeU<
hins=AfxGetInstanceHandle(); ujSzm=_P
InitHotkey(); _HL3XT
return CWinApp::InitInstance(); [&4y@
} tw(2V$J
%B?5l^W@
int CHookApp::ExitInstance() FG(`&S+,
{ V , "'k<y
VerifyWindow(); GkO6r'MVE
UnInit(); L7b{H2 2
return CWinApp::ExitInstance(); @Uu\x~3y
} x~z 2l#ow
-|T^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Af%?WZlOq
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FPMk&
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;K_B,@:'
#if _MSC_VER > 1000 3HiW1*5W
#pragma once lt]U?VZ
#endif // _MSC_VER > 1000 QRjt.Ry|
t2gjhn^p
class CCaptureDlg : public CDialog e8# 3Y+Tc
{ \r2qH0B
// Construction 2u:j6ic
public: Ue7W&N^E
BOOL bTray; g\Zk*5(
BOOL bRegistered; aD^MoB3
BOOL RegisterHotkey(); @88 efF
UCHAR cKey; SM<kE<q#
UCHAR cMask; CG7LF
void DeleteIcon(); ",+uvJT1O
void AddIcon(); utE:HD.PN
UINT nCount; 5 6R,+sN
void SaveBmp(); EpfmH `
CCaptureDlg(CWnd* pParent = NULL); // standard constructor S ] &->5"
// Dialog Data K|/a]I":
//{{AFX_DATA(CCaptureDlg) SrtmpQ
enum { IDD = IDD_CAPTURE_DIALOG }; vOS0E^
CComboBox m_Key; 5zGj,y>u
BOOL m_bControl; aVb]H0
BOOL m_bAlt; *l^'v9
BOOL m_bShift; d7P @_jO6
CString m_Path; ba ?k:b
CString m_Number; vB{b/xmah
//}}AFX_DATA ?uN(" I
// ClassWizard generated virtual function overrides )-{~7@yqZ
//{{AFX_VIRTUAL(CCaptureDlg) a8 1%M
public: .R'i=D`Pz
virtual BOOL PreTranslateMessage(MSG* pMsg);
i=D,T[|>a
protected: ^&.?kJM
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l_%~X9"
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $^!w`>0C
//}}AFX_VIRTUAL cn0Fz"d
// Implementation "m3Y))a
protected: r;C\eN
HICON m_hIcon; x(`$D
// Generated message map functions rZv+K/6*M
//{{AFX_MSG(CCaptureDlg) E0Djo'64
virtual BOOL OnInitDialog(); $yAfs3/%)s
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QFPx4F7(e
afx_msg void OnPaint(); 8hfh,v5(
afx_msg HCURSOR OnQueryDragIcon(); !;gke,fB
virtual void OnCancel(); |DD?3#G01
afx_msg void OnAbout(); >C[1@-]G%7
afx_msg void OnBrowse(); gT
OMD
afx_msg void OnChange(); lo: ~~l
//}}AFX_MSG c5R{Sl
DECLARE_MESSAGE_MAP() yh:,[<q
}; cZ >W8{G
#endif x,dv~QU
q@9i3*q;
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Oy&'zigJ
#include "stdafx.h" q1Sm#_7
#include "Capture.h" F21[r!3
#include "CaptureDlg.h" Ol[gck|~
#include <windowsx.h> Ji[g@#
#pragma comment(lib,"hook.lib") njMy&$6a##
#ifdef _DEBUG PuaosMn(9
#define new DEBUG_NEW J"rwWIxO*
#undef THIS_FILE oNZW#<K
static char THIS_FILE[] = __FILE__; hH}/v0_ jb
#endif 3L?a4,Q"k}
#define IDM_SHELL WM_USER+1 Ba0D"2CgY
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )uvFta<(
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =7fh1XnW
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }!V<"d,!
class CAboutDlg : public CDialog o(/ia3
{ G3+a+=e
public: 3 ?F@jEQk
CAboutDlg(); Vor9
?F&w
// Dialog Data K)&XQ`&
//{{AFX_DATA(CAboutDlg) {K4t8T]
enum { IDD = IDD_ABOUTBOX }; FM"BTA:C
//}}AFX_DATA hX%v`8
// ClassWizard generated virtual function overrides YO$b#
//{{AFX_VIRTUAL(CAboutDlg) 3b@1Zahz
protected: +A ?+G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $Wzv$4;
//}}AFX_VIRTUAL j :Jdwf
// Implementation 0Y*gJ!a
protected: MZW
Y
//{{AFX_MSG(CAboutDlg) !9 LAXM
//}}AFX_MSG F>kn:I"X)
DECLARE_MESSAGE_MAP() u6I0<i_KZ
}; jQeE07g
e=;@L3f
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rbun5&RCyW
{ PB<Sc>{U
//{{AFX_DATA_INIT(CAboutDlg)
e=)*O
//}}AFX_DATA_INIT 'Oy5G7^R
} 9Q7cUoxY
1qKxg
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #u5;utY:F
{ >\x_"oR
CDialog::DoDataExchange(pDX); h9w^7MbO
//{{AFX_DATA_MAP(CAboutDlg) VE"0VB.
//}}AFX_DATA_MAP $_7d! S"
} VueQP|
YSz$` 7i
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +fCyR
//{{AFX_MSG_MAP(CAboutDlg) t2%@py*bU
// No message handlers zV(tvt
//}}AFX_MSG_MAP i2}=/
END_MESSAGE_MAP() K6yFpVl
HD8"=7zJk
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) '"fU2M<.
: CDialog(CCaptureDlg::IDD, pParent) M=
q~EMH
{ sEJ;t0.LX
//{{AFX_DATA_INIT(CCaptureDlg) qTa]th;
m_bControl = FALSE; I1 R\Ts@
m_bAlt = FALSE; yZ~eLWz
m_bShift = FALSE; O$umu_
m_Path = _T("c:\\"); i_'R"ob{S
m_Number = _T("0 picture captured."); g9weJ6@}M
nCount=0; VRQbf
bRegistered=FALSE; >7(~'#x8A"
bTray=FALSE; 5)n:<U*
//}}AFX_DATA_INIT
k E#_Pc
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Wh'_slDH+
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !%RJC,X
} $L&9x3+?Kg
<&Y}j&(
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hzuMTKH9
{ <j1d~XU}
CDialog::DoDataExchange(pDX); ~ut& U
//{{AFX_DATA_MAP(CCaptureDlg) B-ri}PA
DDX_Control(pDX, IDC_KEY, m_Key); @F(3*5c_Y
DDX_Check(pDX, IDC_CONTROL, m_bControl); Z/6'kE{l
DDX_Check(pDX, IDC_ALT, m_bAlt); qvfAG 0p
DDX_Check(pDX, IDC_SHIFT, m_bShift); sRe#{EuJ
DDX_Text(pDX, IDC_PATH, m_Path); &DbGyV8d"|
DDX_Text(pDX, IDC_NUMBER, m_Number); [>M*_1F
//}}AFX_DATA_MAP @(,{_c]
} d0}%%T
bUAR<R'E
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X@h^T>["
//{{AFX_MSG_MAP(CCaptureDlg) =4M.QA@lI!
ON_WM_SYSCOMMAND() i^s`6:rNu
ON_WM_PAINT() (9YYv+GGd*
ON_WM_QUERYDRAGICON() #EQx
ON_BN_CLICKED(ID_ABOUT, OnAbout) Q&.IlVB[
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [nN\{"~O
ON_BN_CLICKED(ID_CHANGE, OnChange) e0|_Z])D
//}}AFX_MSG_MAP we H@S
END_MESSAGE_MAP() yjOu]K:X
J^g,jBk
BOOL CCaptureDlg::OnInitDialog() &8X
.!r`f
{ Oj4u!SY\j
CDialog::OnInitDialog();
,3J`ftCV
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); LpiHoavv
ASSERT(IDM_ABOUTBOX < 0xF000); S`W'G&bCj
CMenu* pSysMenu = GetSystemMenu(FALSE); 94p:| 5@
if (pSysMenu != NULL) L)R[)$2(g
{ dxkRk#mf:
CString strAboutMenu; 4(Cd
strAboutMenu.LoadString(IDS_ABOUTBOX); 6HEqm>Yau
if (!strAboutMenu.IsEmpty()) d Y:|Ef|v(
{ %EJ\|@N:
pSysMenu->AppendMenu(MF_SEPARATOR); ElEv(>G*
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k"q!|+&Fs
} HvqF@/xh
} jIx8k8
SetIcon(m_hIcon, TRUE); // Set big icon \ifK~?
SetIcon(m_hIcon, FALSE); // Set small icon LL= Z$U
$
m_Key.SetCurSel(0); xb+RRTgj
RegisterHotkey(); J0ZxhxX35
CMenu* pMenu=GetSystemMenu(FALSE); {uaZ<4N.
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [5?4c'Ev
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S'
(cqO}=F
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ci7P%]9
return TRUE; // return TRUE unless you set the focus to a control M#\ <
}
#gW /qJ
:jt;EzCLg%
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) GSMk\9SI
{ W_[|X}lWP
if ((nID & 0xFFF0) == IDM_ABOUTBOX) AW,v
{ ,:#,}w_HyO
CAboutDlg dlgAbout; H&w:`JYDL3
dlgAbout.DoModal(); DS#cm3
} Q^z=w![z
else fm(mO%
{ @4IW=V
CDialog::OnSysCommand(nID, lParam); @~m=5C
} <Rcu%&;i
} [[R7~.;
!dU9sB2
void CCaptureDlg::OnPaint() {]wIM^$6+
{ ~7dM!g{W
if (IsIconic()) G'ij?^?
{ R)0N0gH
CPaintDC dc(this); // device context for painting \~JNQ&_o
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =N YgGEFq.
// Center icon in client rectangle /y}"M
int cxIcon = GetSystemMetrics(SM_CXICON); Y3#Nux%
int cyIcon = GetSystemMetrics(SM_CYICON); 6g5PM4\
CRect rect; QWrIa1.JC
GetClientRect(&rect); j$3rJA%rN
int x = (rect.Width() - cxIcon + 1) / 2; %KGq*|GUu
int y = (rect.Height() - cyIcon + 1) / 2; @Ii-NmOr
// Draw the icon BjJ,"sT
dc.DrawIcon(x, y, m_hIcon); e]lJqC
} )PR3s1S^
else *IC^IC:
{ ldA!ou7
CDialog::OnPaint(); QX[Djz0H8
} n[!;yO
} ;Vg^!]LL#
1EVfowIl
HCURSOR CCaptureDlg::OnQueryDragIcon() n;wwMMBM
{ yL0f1nS
return (HCURSOR) m_hIcon; f|OI`
} Vclr)}5
KQ&Y2l1*>>
void CCaptureDlg::OnCancel() \ht ?Gn
{ g>so
R&*
if(bTray) 9YB2e84j
DeleteIcon(); (+*
][|T
CDialog::OnCancel(); et=7}K]l
} ,V,f2W 4
$@_{p*q
void CCaptureDlg::OnAbout() nqT> qS[Z
{ a 6%@d_A
CAboutDlg dlg; bW53" `X
dlg.DoModal(); >R!"P[*
} (8.{+8o
j~bAbOX12
void CCaptureDlg::OnBrowse() iOX Z]Xj5
{ i[\w%(83Fi
CString str; r'/\HWNP
BROWSEINFO bi; Hkdf $$\
char name[MAX_PATH]; zDD4m`2
ZeroMemory(&bi,sizeof(BROWSEINFO)); aX;A==>
bi.hwndOwner=GetSafeHwnd(); hk%k(^ekU]
bi.pszDisplayName=name; Hou*lCA
bi.lpszTitle="Select folder"; 2-~|Z=eGW
bi.ulFlags=BIF_RETURNONLYFSDIRS; F/>*Ifs
LPITEMIDLIST idl=SHBrowseForFolder(&bi); nZfs=@w:y
if(idl==NULL) U@'F%nHw
return; .20V
3
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &)n_]R#)
str.ReleaseBuffer(); \R(R9cry
m_Path=str; w/W7N
if(str.GetAt(str.GetLength()-1)!='\\') \<~}o I
m_Path+="\\"; OsQkA2=
UpdateData(FALSE); #uSK#>H_!
} .wmnnvtl,
l4rMk^>>
void CCaptureDlg::SaveBmp() ldGojnS
{ W^es;5
CDC dc; VPt9QL(
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4:7m K/Z
CBitmap bm; UUeB;'E+
int Width=GetSystemMetrics(SM_CXSCREEN); /@hJpz|+
int Height=GetSystemMetrics(SM_CYSCREEN); )tS-.P rA-
bm.CreateCompatibleBitmap(&dc,Width,Height); .h4\{|
CDC tdc; 4*TmlY
tdc.CreateCompatibleDC(&dc); qTT,U9]:
CBitmap*pOld=tdc.SelectObject(&bm); Tk*w3c"$
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z<U>A
tdc.SelectObject(pOld); F30
]
BITMAP btm;
W^Y#pn
bm.GetBitmap(&btm); mk!Dozb/
DWORD size=btm.bmWidthBytes*btm.bmHeight; lT'9u,6
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }u%"$[I}
BITMAPINFOHEADER bih; |S&5es-yW
bih.biBitCount=btm.bmBitsPixel; K B!5u 9
bih.biClrImportant=0; [ %}u=}@
bih.biClrUsed=0; \ECu5L4
bih.biCompression=0; {hQ6K)s
bih.biHeight=btm.bmHeight; I9Eu',
bih.biPlanes=1; & ze>X
bih.biSize=sizeof(BITMAPINFOHEADER); (CJ.BHu]
bih.biSizeImage=size; 9@K.cdRjQ
bih.biWidth=btm.bmWidth; .$&Q[r3Lu
bih.biXPelsPerMeter=0; e4`uVq5
bih.biYPelsPerMeter=0; PE"v*9k
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ya#h'+}
static int filecount=0; paW@\1Q
CString name; :=Kx/E:1
name.Format("pict%04d.bmp",filecount++); eS'yGY0b
name=m_Path+name; fKHE;A*>%
BITMAPFILEHEADER bfh; GaekFbW)
bfh.bfReserved1=bfh.bfReserved2=0; y<- _(^
bfh.bfType=((WORD)('M'<< 8)|'B'); JBC$Ku
bfh.bfSize=54+size; =WG=C1Z
bfh.bfOffBits=54; EH n"n"Y
CFile bf; I7n3xN&4"
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !2tW$BP^
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #Yuvbb[
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); geM6G$V&
bf.WriteHuge(lpData,size); RO&H5m r%@
bf.Close(); ^B/9{0n'
nCount++; 3QXjD/h
} [q*%U4qGO
GlobalFreePtr(lpData); JWv{=_2w
if(nCount==1) At6qtoPRA
m_Number.Format("%d picture captured.",nCount); 1[;;sSp
else usFfMF X
m_Number.Format("%d pictures captured.",nCount); F%d\~Vj
UpdateData(FALSE); VsK>6S\T
} 80pid[F
!ABiy6d
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rJJ[X4$
{ vUA0FoOp
if(pMsg -> message == WM_KEYDOWN) Sv'y e
{ \.uc06
if(pMsg -> wParam == VK_ESCAPE) w Q+8\ s=
return TRUE; LD>\#q8a*
if(pMsg -> wParam == VK_RETURN) e:w&(is
return TRUE; |Ic`,>XM
} | ?yo 3
return CDialog::PreTranslateMessage(pMsg); &a,OfSz
} 52_#
a4MZ;5
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p(F " /
{ /9pM>Cd*Z
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $ ((6=39s
SaveBmp(); (ljF{)Ml+=
return FALSE; ])DX%$f
} CO:u1?
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2@=IT0[E\
CMenu pop; o|BP$P8V
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); MJ`3ta
CMenu*pMenu=pop.GetSubMenu(0); kc `V4b%
pMenu->SetDefaultItem(ID_EXITICON); )B#
,
CPoint pt; +rXF{@
l
GetCursorPos(&pt); Ih}1%Jq
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a:,y
Z
if(id==ID_EXITICON) A3N]8?D
DeleteIcon(); e({9]
else if(id==ID_EXIT) ^Xb7[+I6
OnCancel(); wC_l@7t
return FALSE; Ny- [9S-<
} #]?bLm<!
LRESULT res= CDialog::WindowProc(message, wParam, lParam); '*^yAlgtt
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A-
YBQPE
AddIcon(); (>4aibA'P
return res; :~Q!SL N
} }R[#?ty;]
Kv'n:z7Md
void CCaptureDlg::AddIcon() WtulTAfN
{ [#Lc]$
NOTIFYICONDATA data; #1 1NPo9
data.cbSize=sizeof(NOTIFYICONDATA); Uxfl_@lJ
CString tip; 57a2^
tip.LoadString(IDS_ICONTIP); 'ly?P8h
data.hIcon=GetIcon(0); "gtHTqheH
data.hWnd=GetSafeHwnd(); 9>zcBG8f
strcpy(data.szTip,tip); j$UV/tp5T
data.uCallbackMessage=IDM_SHELL; 2aw&YZ&Xo
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #`TgZKDg2
data.uID=98; TGXa,A{
Shell_NotifyIcon(NIM_ADD,&data); B
vo5-P6XY
ShowWindow(SW_HIDE); >(w2GD?
bTray=TRUE; \0l>q ,
} PNF?;*`-{7
SzwQOs*
void CCaptureDlg::DeleteIcon() W7"{r)7
{ Zv11uH-C
NOTIFYICONDATA data; Ji1Pz)fq
data.cbSize=sizeof(NOTIFYICONDATA); Ho DVn/lr
data.hWnd=GetSafeHwnd(); u]
:m"LM
data.uID=98; }8|[;Qa`y
Shell_NotifyIcon(NIM_DELETE,&data); XqRJr%JH
ShowWindow(SW_SHOW); G+xt5n.%
SetForegroundWindow(); D4eTTfQ
ShowWindow(SW_SHOWNORMAL); tWTKgbj(
bTray=FALSE; 'i;|c
} /-bF$)vN
^D^4
YJz
void CCaptureDlg::OnChange() -K,-h[o
{ ]<(]u#g_d
RegisterHotkey(); Y2B&go
} 2sNK
bNFLO
Q
BOOL CCaptureDlg::RegisterHotkey() taGU
{ G22NQ~w8
UpdateData(); Pq*s{
UCHAR mask=0; V.ht,
~l
UCHAR key=0; @`tXKP$so
if(m_bControl) ES~^M840f
mask|=4; iwz
if(m_bAlt) HEL!GC>#
mask|=2; c_aZ{S
if(m_bShift) 5D M"0
mask|=1; -9RDr\&`(
key=Key_Table[m_Key.GetCurSel()]; MMB@.W
if(bRegistered){ mk7&<M
DeleteHotkey(GetSafeHwnd(),cKey,cMask); %ms'n
bRegistered=FALSE; 6sIL.S~c)
} Wg{k$T_>
cMask=mask; Go,N>HN
cKey=key; WN(ymcdYB
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); PJxH7|GSi
return bRegistered; f\'{3I29
} }:0uo5B7
(feTk72XX
四、小结 '$4O!YI9@
e%8|<g+n6
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。