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:
3d,:,f|h
CSz+cS 一、实现方法
:F9Oj1lM% bkz/V/ Y 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:
bcT'!: X<5&R{oZ #pragma data_seg("shareddata")
!R@jbM HHOOK hHook =NULL; //钩子句柄
,9MNB3 UINT nHookCount =0; //挂接的程序数目
m4yWhUi(o static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
wEN[o18{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
#N%j9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
G:@1.H` static int KeyCount =0;
m# -&<= static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
ddbQFAQQQ #pragma data_seg()
T%;NW|mH& QjD=JC+ 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。
1f'msy/ 6 !N2B[9 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:
A8o)^T(vJ gGN6Yqj0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
LDYa{w-t cKey,UCHAR cMask)
H/Rzs$pnv {
z: BOOL bAdded=FALSE;
dK0H.| for(int index=0;index<MAX_KEY;index++){
_'<FBlIN if(hCallWnd[index]==0){
e {3%- hCallWnd[index]=hWnd;
>&k`NXS|V HotKey[index]=cKey;
$=`d[04 HotKeyMask[index]=cMask;
m&z(2yb1 bAdded=TRUE;
]h=5d09z KeyCount++;
fJ6Q:7 break;
$*LBZcL }
URt+MTU[ }
VF b return bAdded;
)eqF21\ }
U3{4GmrT //删除热键
_/u(: BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
((<\VQ,>( {
J1Az+m BOOL bRemoved=FALSE;
\Lg4 Cx for(int index=0;index<MAX_KEY;index++){
rO YD[+ if(hCallWnd[index]==hWnd){
mIPDF1=) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$RunGaX!=N hCallWnd[index]=NULL;
KD\sU6 HotKey[index]=0;
\ H#" HotKeyMask[index]=0;
IYHNN bRemoved=TRUE;
2+b}FVOe\ KeyCount--;
wQ~]VVRN break;
ggm'9| }
lL
50PU }
8TK*VOf` }
gv D*^ return bRemoved;
kP5G}Bp }
nLC5FA7< c=QN!n:
Oi]B%Uxy= DLL中的钩子函数如下:
P,xJVo\ =BJe}AV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
bTZ.y.sI {
atmW? Z BOOL bProcessed=FALSE;
.:GOKyr(~ if(HC_ACTION==nCode)
#{^qBP[ {
!H<%X~|, if((lParam&0xc0000000)==0xc0000000){// 有键松开
q*C-DiV switch(wParam)
SLUQFoz} {
BjA$^ i|8 case VK_MENU:
SXN]${ MaskBits&=~ALTBIT;
@1<VvW= break;
0\s&;@xKk case VK_CONTROL:
^,)nuUy MaskBits&=~CTRLBIT;
bI_MF/r'' break;
@; I9e case VK_SHIFT:
9\T9pjdZE MaskBits&=~SHIFTBIT;
M4CC&?6\ break;
^dsj1#3z default: //judge the key and send message
]ms+Va_/ break;
1L!jI2~x} }
`e?~c'a@ for(int index=0;index<MAX_KEY;index++){
O:
#SjjK if(hCallWnd[index]==NULL)
r* l
c# continue;
lV$#>2Hh5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ckv8QAm {
[tElt4uG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^]~!:Ej0 bProcessed=TRUE;
B#35)QI }
$$< I}eMd> }
):}A Quy] }
!_;J@B else if((lParam&0xc000ffff)==1){ //有键按下
DL,]iJm switch(wParam)
TIR Is1 {
(<-m|H}; case VK_MENU:
ll- KK`Ka MaskBits|=ALTBIT;
0
0|!g"E>$ break;
w`3.wALb case VK_CONTROL:
.+<Ka0 MaskBits|=CTRLBIT;
eH[i<Z break;
x5Fo?E case VK_SHIFT:
zA:q/i MaskBits|=SHIFTBIT;
jUgx
;= break;
A wk1d default: //judge the key and send message
;sq xFF@ break;
zK{} }
?r5a* for(int index=0;index<MAX_KEY;index++){
r.6?| if(hCallWnd[index]==NULL)
,?Zy4- continue;
53pT{2]zAi if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
s.n:;8RibP {
qDz[=6BF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
x;-D}# bProcessed=TRUE;
}UQ,B }
@LDs$"f9= }
" vc4QH$ }
SBf=d<j 1) if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
mV)t for(int index=0;index<MAX_KEY;index++){
hY!>> if(hCallWnd[index]==NULL)
ccp9nXv continue;
$J,$_O6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
u47`&\ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,8d&uR}x //lParam的意义可看MSDN中WM_KEYDOWN部分
~l{Qz0& }
! hEZV&y }
nZc6
*jiz }
H~SU:B: return CallNextHookEx( hHook, nCode, wParam, lParam );
D ]
n|d+ }
5p5"3m;M7 apgKC; 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:
-1`}|t; QnS#"hc\a BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*M0O&" ~j BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`P-d. M6Oa q;IuV&B
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:
C dPQhv)m D%c^j9' 1 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
pSIXv%1J {
Wa.!eAe} if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
E|SmvIV- {
%g3QE:(2@q //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
,:MUf]Ky SaveBmp();
NYs<`6P:Y return FALSE;
o{n#f?EA }
B,%KvL&xMX …… //其它处理及默认处理
OL:hNbw'~T }
4^4T#f2=e B4+c3M\$V pv&iJ7RN 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。
es\
qnq 8 ph1xQ' 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。
pY&dw4V ?hR0
MnP 二、编程步骤
8m
`Y ,# .12Q! 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";
JP
{`^c jUR*
| 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
$ndBT+i Cw kQhj? 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
LTH,a?lD X*d!A
>s 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Aw4)=-LKO x_?K6[G&} 5、 添加代码,编译运行程序。
~i'!;'-_} WX_g 三、程序代码
HU4h.Lm _^zs( ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
\yxGE+~P #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
3webAaO #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
t}pYSSTz #if _MSC_VER > 1000
Gv
} #pragma once
nGc'xQy0 #endif // _MSC_VER > 1000
PU B0H #ifndef __AFXWIN_H__
_FS #~z'j #error include 'stdafx.h' before including this file for PCH
nU\.`.39
+ #endif
T2)CiR-b #include "resource.h" // main symbols
8oRq3 " class CHookApp : public CWinApp
Pc5C*{C {
T?=]&9Y' public:
d7zZ~n CHookApp();
uk,9N // Overrides
In!^+j // ClassWizard generated virtual function overrides
b].U/=Hs //{{AFX_VIRTUAL(CHookApp)
xXmlHo<D public:
eWD!/yr| virtual BOOL InitInstance();
/l3Oi@\
virtual int ExitInstance();
Gi$\th, //}}AFX_VIRTUAL
KZ^>_K& //{{AFX_MSG(CHookApp)
\VW":+ // NOTE - the ClassWizard will add and remove member functions here.
qf<o"B|_9 // DO NOT EDIT what you see in these blocks of generated code !
*`/4KMrq //}}AFX_MSG
\9od*y DECLARE_MESSAGE_MAP()
U7f
o4y1} };
_+7P"B|\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
mL'A$BR` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
OPqhdqo BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]iFW>N*a BOOL InitHotkey();
XbFo#Pwk BOOL UnInit();
@ptrF
pSL #endif
[O!/hppN EQZ/v gho //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
.RmoO\
,Gm #include "stdafx.h"
p<l+js(5| #include "hook.h"
3!QXzT$E #include <windowsx.h>
Xa$%`
#ifdef _DEBUG
R3)ccom #define new DEBUG_NEW
AxTFVot #undef THIS_FILE
o:
> (Tv static char THIS_FILE[] = __FILE__;
U-f8D #endif
?>vkY^/ #define MAX_KEY 100
{BaPK&x, #define CTRLBIT 0x04
=T?Xph{ #define ALTBIT 0x02
i??+5o@uTF #define SHIFTBIT 0x01
HxLuJ #pragma data_seg("shareddata")
{CVZ7tU7] HHOOK hHook =NULL;
C$LRX7Z`o UINT nHookCount =0;
X9^q-3&60 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
bmKvvq static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
k][{4~z
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
0D `9 static int KeyCount =0;
4Sdj#w static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
pjSM7PhQ #pragma data_seg()
?G]yU HINSTANCE hins;
#,})N*7 void VerifyWindow();
gQY`qz BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
_ |HA\! //{{AFX_MSG_MAP(CHookApp)
$`0,N_C<} // NOTE - the ClassWizard will add and remove mapping macros here.
M;KeY[u // DO NOT EDIT what you see in these blocks of generated code!
u3UN //}}AFX_MSG_MAP
=_Z.x&fi END_MESSAGE_MAP()
j"zW0g!S ;>X;cZMd CHookApp::CHookApp()
_)3C_G1! {
fJ\u8 // TODO: add construction code here,
q%/.+g2-\ // Place all significant initialization in InitInstance
('d,Sh }
JlEfUg#* Cgf4E{\U! CHookApp theApp;
R /_vJHI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$!z .[GL {
P(C5@x(Z BOOL bProcessed=FALSE;
Tpkt'|8 if(HC_ACTION==nCode)
G#uB%:)&0u {
jC?l :m? if((lParam&0xc0000000)==0xc0000000){// Key up
EF=5[$
u switch(wParam)
07ppq?,y {
puEu)m^ case VK_MENU:
n}4q2x" MaskBits&=~ALTBIT;
9~K+h/ break;
6 vJS"+ < case VK_CONTROL:
[+}0K{(O= MaskBits&=~CTRLBIT;
XJq]l6a: break;
jgkY^l case VK_SHIFT:
k<N5*k8M MaskBits&=~SHIFTBIT;
k@[[vj|W break;
X2Q35.AB default: //judge the key and send message
%Z*)<[cIE0 break;
KXWz(L!1 }
v`6vc)>8 for(int index=0;index<MAX_KEY;index++){
!l6ht{ if(hCallWnd[index]==NULL)
Un5 AStG continue;
AkO-PL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a,fcR< {
V%zo[A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0B~x8f bProcessed=TRUE;
C}9|e?R[Rz }
{q;_Dd }
.I^Y[_.G }
-Wre4^,v else if((lParam&0xc000ffff)==1){ //Key down
7.kH="@ switch(wParam)
$8[JL\ {
"`a,/h' case VK_MENU:
)$*B MaskBits|=ALTBIT;
vP%:\u:{ break;
#9qX:*>h case VK_CONTROL:
YnCuF0> MaskBits|=CTRLBIT;
+p]@ b break;
fM*aZc*Y case VK_SHIFT:
eqWs(` MaskBits|=SHIFTBIT;
TA#pA(k break;
h 3 J& default: //judge the key and send message
Q,ZV C break;
KT*"Sbh }
^
$N3.O. for(int index=0;index<MAX_KEY;index++)
lhBAT%U\ {
$lUz!mjG if(hCallWnd[index]==NULL)
@?0))@kPc3 continue;
RE]*fRe7# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
sc rss {
)}i2x:\|_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
rD c$# bProcessed=TRUE;
Q7mikg=1- }
,}Im^~5 }
|n(b>.X }
#!r>3W& if(!bProcessed){
FIQHs"#T for(int index=0;index<MAX_KEY;index++){
CXi:?6OG if(hCallWnd[index]==NULL)
f\Q_]%^W continue;
v\}{eP' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
d%p{l)Hd SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Y"m}=\4{ }
$:vS_# }
R+Ug;r-[ }
T~?&hZ> return CallNextHookEx( hHook, nCode, wParam, lParam );
m*KI'~#$% }
G12o?N0p %F:; A BOOL InitHotkey()
g12.4+ {
T[J8zLO if(hHook!=NULL){
"VMb1Zhf nHookCount++;
b.)jJLWv@ return TRUE;
:n?rk/ F }
b~TTz`HZ else
A[:(#iR5-E hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
fvA167\ if(hHook!=NULL)
pE.TG4 nHookCount++;
r8o^8 . return (hHook!=NULL);
<anU#bEuQ }
^r{N^ BOOL UnInit()
X%`:waR {
h+9~^<oFl if(nHookCount>1){
vJb/.)gh] nHookCount--;
j`MK\*qmz return TRUE;
[Z!oVSCZD% }
+9#qNkP BOOL unhooked = UnhookWindowsHookEx(hHook);
"`*
>co6r if(unhooked==TRUE){
%e+*&Z', nHookCount=0;
58o&Dv6? hHook=NULL;
&NI\<C7_Gw }
}CrWmJu0 return unhooked;
-L
wz
T }
w@a|_? ')(U<5y) BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
acj-*I {
3u,B< BOOL bAdded=FALSE;
M{YN^
Kk for(int index=0;index<MAX_KEY;index++){
(/!zHq if(hCallWnd[index]==0){
!d95gq<=> hCallWnd[index]=hWnd;
\|Y_,fi HotKey[index]=cKey;
5wv7]F< HotKeyMask[index]=cMask;
|jcIn[)= bAdded=TRUE;
V&lx0Dy KeyCount++;
6Z@T
/"mU( break;
\[wbJ }
Ghar
hJ>v }
d8p5a
C+E return bAdded;
qGP} }
I(Vg ?&VKZSo
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Qzv& {
zbvV:9N BOOL bRemoved=FALSE;
In;+wFu;M for(int index=0;index<MAX_KEY;index++){
ZCNO_g if(hCallWnd[index]==hWnd){
*\`<=,H6< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
[|(=15; hCallWnd[index]=NULL;
C)%qs] HotKey[index]=0;
s&\krW& HotKeyMask[index]=0;
Qm*X Wo bRemoved=TRUE;
\\`(x:\ KeyCount--;
akWOE}5# break;
Xv 7noq| }
BUyKiMW 49 }
hOuHTo^ }
gE8>o:6)6: return bRemoved;
Qr?1\H:Lq }
8cuI-Swz bP4}a!t+n void VerifyWindow()
4"\%/kG {
WzBr1
ea{I for(int i=0;i<MAX_KEY;i++){
D4~]:@v~n if(hCallWnd
!=NULL){ WDt 6{5T
if(!IsWindow(hCallWnd)){ *0<)PJ T
hCallWnd=NULL; F]s:`4
HotKey=0; &+yoPF
HotKeyMask=0; ;ssI8\LG
KeyCount--; y8}
/e@&
} =RQI5nHdw
} `X<a(5[vV3
} MXDUKh7v3
} \=o0MR
{*K$gH$
BOOL CHookApp::InitInstance() T*'WS!z
{ wGxH
AFX_MANAGE_STATE(AfxGetStaticModuleState()); sFsf~|
hins=AfxGetInstanceHandle(); 4`")aM
InitHotkey(); S,vdd7Y
return CWinApp::InitInstance(); rCb#E}
} (D{J|
z:u)@>6D1
int CHookApp::ExitInstance() K@a#^lmd
{ R 'fEw3^
VerifyWindow(); Ns5P,[pBOZ
UnInit(); j}6h}E&dEr
return CWinApp::ExitInstance(); V~do6[(
} tjx|;m7
ZEvK
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L<6nM
;d
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F&
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ aP
B4!3W
#if _MSC_VER > 1000 {xh5s<uOj
#pragma once Ei=rBi
#endif // _MSC_VER > 1000 =J'Q%qN<Zd
Hlpt zez
class CCaptureDlg : public CDialog {.J<^V
{ j-ob7(v)*]
// Construction Qraa0]56
public: ,T;D33XV
BOOL bTray; zMd><UQP{
BOOL bRegistered; %Hhk
6tR,
BOOL RegisterHotkey(); Ty7)j]b"zl
UCHAR cKey; ,qNbo
11
UCHAR cMask; </aQ
void DeleteIcon(); 6{yn;D4
void AddIcon(); _'*(-K5&
UINT nCount; r`<x@,
void SaveBmp(); 8q;
aCtei
CCaptureDlg(CWnd* pParent = NULL); // standard constructor %P:|B:\<
// Dialog Data 5hTScnL%
//{{AFX_DATA(CCaptureDlg) `7[!bCl
enum { IDD = IDD_CAPTURE_DIALOG }; $9:
@M.
CComboBox m_Key; O2"V'(
BOOL m_bControl; z#GSt
ZT
BOOL m_bAlt; ;<"V},
C
BOOL m_bShift; 0Gu?;]GSv
CString m_Path; k"%sdYkb!
CString m_Number; p"j&s
//}}AFX_DATA (!YJ:,!so
// ClassWizard generated virtual function overrides $aN%[
//{{AFX_VIRTUAL(CCaptureDlg) aIh} j,
public: L!,@_
virtual BOOL PreTranslateMessage(MSG* pMsg); =d]}7PO~
protected: ( GoPXh
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }}k*i0
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); XL'\$f
//}}AFX_VIRTUAL yB 'C9wEH
// Implementation +wQ}ZP&
protected: .tQ(q=#
HICON m_hIcon; COmu.'%*
// Generated message map functions ^YB2E*
//{{AFX_MSG(CCaptureDlg) W=OryEV?
virtual BOOL OnInitDialog(); +;M 5Sp
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0)ZLdF_6
afx_msg void OnPaint(); Qqk(,1u
afx_msg HCURSOR OnQueryDragIcon(); q03+FLEfC
virtual void OnCancel(); # s7e/GdKb
afx_msg void OnAbout(); xvomn`X1
afx_msg void OnBrowse(); 7>0u
N|
afx_msg void OnChange(); )d2:r 07a
//}}AFX_MSG 8=zREt<Se
DECLARE_MESSAGE_MAP() uh \Tf5
}; u|6-[I
#endif oK$Krrs0&
XODp[+xEEt
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C
,|9VH
#include "stdafx.h" ?<Lm58p8
#include "Capture.h" ]E'?#z.t
#include "CaptureDlg.h" !nlr!+(fV
#include <windowsx.h> xEeHQ7J
#pragma comment(lib,"hook.lib") Rw FA
#ifdef _DEBUG VJ_fA}U
#define new DEBUG_NEW ,KU%"{6
#undef THIS_FILE pS}IU{#;
static char THIS_FILE[] = __FILE__; ~tZB1+%)
#endif dnQ6Ras
#define IDM_SHELL WM_USER+1 6NHP/bj<1V
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {<-wm-]mo
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E'5KJn;_7
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3d4A~!Iz
class CAboutDlg : public CDialog O'{kNr{u
{ lnLy"f"zV
public: ^ meU&
CAboutDlg(); 96J]g*o(uU
// Dialog Data B692Mn
//{{AFX_DATA(CAboutDlg) y`
'#gH
enum { IDD = IDD_ABOUTBOX }; rK`^A
//}}AFX_DATA *<6dB#'
J
// ClassWizard generated virtual function overrides 0CK
//{{AFX_VIRTUAL(CAboutDlg) [Q J
protected: zufsmY4P
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _VTpfeL@n
//}}AFX_VIRTUAL MI(;0
// Implementation 3la `S$c
protected: B([-GpZt[
//{{AFX_MSG(CAboutDlg) c_?^:xs:d
//}}AFX_MSG wu`+KUx
DECLARE_MESSAGE_MAP() kM&-t&7
}; noEl+5uY
AE~@F4MK
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dqo-.,=
{ 1~3dX[&
//{{AFX_DATA_INIT(CAboutDlg) :]CL}n$*
//}}AFX_DATA_INIT Oh>hyY)}
} q-uzu !
PAtv#)h
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9F?-zn;2s
{ CQ^(/B^c
CDialog::DoDataExchange(pDX); <t*<SdAq>`
//{{AFX_DATA_MAP(CAboutDlg) Vsw:&$
//}}AFX_DATA_MAP 8oXp8CC
} qswC>Gi
z@pa;_
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ZkQ6~cM
//{{AFX_MSG_MAP(CAboutDlg) VmN 7a6a
// No message handlers P8|ANe1
v
//}}AFX_MSG_MAP o0S8ki
END_MESSAGE_MAP() %*wEzvt*
HW,v"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) x?0K'
: CDialog(CCaptureDlg::IDD, pParent) l^B4.1rT
{ IYXN}M.=
//{{AFX_DATA_INIT(CCaptureDlg) yjH'<
m_bControl = FALSE; 0Q?%B6g$m[
m_bAlt = FALSE; *" C9F/R
m_bShift = FALSE; +`>E_+Mp
m_Path = _T("c:\\"); (C"q-0?n
m_Number = _T("0 picture captured."); Xw<;)m
nCount=0; &=$f\O1Ty
bRegistered=FALSE; Dj'?12Onu=
bTray=FALSE; A9u>bWIE7
//}}AFX_DATA_INIT V45adDiZ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /x$JY\cq`
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6w{_+=T
} fjl9*
rqdN%=C
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vNuws_
{ ITTEUw~+o
CDialog::DoDataExchange(pDX); EG$-D@o\I
//{{AFX_DATA_MAP(CCaptureDlg) /j4G}
DDX_Control(pDX, IDC_KEY, m_Key); Mx`';z8~
DDX_Check(pDX, IDC_CONTROL, m_bControl); aX6}:"R2C
DDX_Check(pDX, IDC_ALT, m_bAlt); ; '
vkF
DDX_Check(pDX, IDC_SHIFT, m_bShift); 2nCc(F&+?
DDX_Text(pDX, IDC_PATH, m_Path); XM*5I4V
DDX_Text(pDX, IDC_NUMBER, m_Number); vM5/KrW
//}}AFX_DATA_MAP e@TwZ6l
} "J2q|@.
5B2p_$W#
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) jgG9?w)|u
//{{AFX_MSG_MAP(CCaptureDlg) x9a\~XL>a
ON_WM_SYSCOMMAND() i20y\V
os?
ON_WM_PAINT() knph549
ON_WM_QUERYDRAGICON() N[Ei%I
ON_BN_CLICKED(ID_ABOUT, OnAbout) US"g>WLwJ
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) OY:rcGc`t
ON_BN_CLICKED(ID_CHANGE, OnChange) BG?>)]6
//}}AFX_MSG_MAP W|2| v?v
END_MESSAGE_MAP() 7Re\*[)T
CMOyK^(e
BOOL CCaptureDlg::OnInitDialog() CM++:Y vJ
{ ~D4l64
CDialog::OnInitDialog(); ryh"/lu[B
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oVn&L*H
ASSERT(IDM_ABOUTBOX < 0xF000); X#JUorGp
CMenu* pSysMenu = GetSystemMenu(FALSE); C~@m6K
if (pSysMenu != NULL) |Rkw/5
{ K/f-9hE F
CString strAboutMenu; 5|K[WvG@Co
strAboutMenu.LoadString(IDS_ABOUTBOX); "G.X=,
V
if (!strAboutMenu.IsEmpty()) 3Wv^{|^
{ n5.sx|bI?
pSysMenu->AppendMenu(MF_SEPARATOR); xsJXf @
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6vE#$(n#a&
} UdM2!f
} ./Ek+p*96H
SetIcon(m_hIcon, TRUE); // Set big icon 6o3#<ap<
SetIcon(m_hIcon, FALSE); // Set small icon y2s(]#8
m_Key.SetCurSel(0); B>!mD{N
RegisterHotkey(); JW^ ${4
CMenu* pMenu=GetSystemMenu(FALSE); ?2Z`xL9QT
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6Q]c}
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); DgW@v[#BK=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); T@IzfX7
return TRUE; // return TRUE unless you set the focus to a control F!)[H["_
} _0'X!1"
Y)pop:y t
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]j6pd*H
{ )lS04|s
if ((nID & 0xFFF0) == IDM_ABOUTBOX) `NgQ>KV!
{ _LC*_LT_
CAboutDlg dlgAbout; v G\J8s
dlgAbout.DoModal(); 37a1O>A
} z+6PVQ
else A-=hvJ5T
{ Xnjl {`
CDialog::OnSysCommand(nID, lParam); [w@S/K[_|
} GU2TQx{V
} C12V_)~2
|/n7(!7$[v
void CCaptureDlg::OnPaint() ^tG,H@95
{ ly[dV.<P
if (IsIconic()) GuU-<*u(d
{ ^GY^g-R
CPaintDC dc(this); // device context for painting O)VcW/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *Ic^9njt
// Center icon in client rectangle UhS:tT]7
int cxIcon = GetSystemMetrics(SM_CXICON); $o5i15Oy.
int cyIcon = GetSystemMetrics(SM_CYICON);
l:UKU !
CRect rect; 0{bl^#$f
GetClientRect(&rect); 63Gq5dF
int x = (rect.Width() - cxIcon + 1) / 2; +ynhN\S$/
int y = (rect.Height() - cyIcon + 1) / 2; wyB]!4yy,
// Draw the icon C{uT1`
dc.DrawIcon(x, y, m_hIcon); >L4F'#I
} 8&"Jlz
|
else l$9k:#\FD
{ !0Nf`iCQ(
CDialog::OnPaint(); i)X~L4gn
} +<F3}]]
} PLs`Ci|`
tR'RB@kJ
HCURSOR CCaptureDlg::OnQueryDragIcon() M`'DD-Q
{ a<r,LE
return (HCURSOR) m_hIcon; 'ZMh<M[
} f7Nmvla[q
Ul]7IUzsu
void CCaptureDlg::OnCancel() `j)56bR
{ W5`p Qdk
if(bTray) CQ/+- -o
DeleteIcon(); l_:P|
CDialog::OnCancel(); Nr>UZlU8
} L{F]uz_[x
jwE=
void CCaptureDlg::OnAbout() <Y}m/-sD5
{ zE$HHY2ovi
CAboutDlg dlg; ;#v3C;
dlg.DoModal(); >\?
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} ZJ)Z
zqNzWX
void CCaptureDlg::OnBrowse() rY^uOrR>j*
{ w$f_z*/
CString str; HSG Ln906
BROWSEINFO bi; H6 x
char name[MAX_PATH]; T&pCLvkz
ZeroMemory(&bi,sizeof(BROWSEINFO)); W)Y`8&,
bi.hwndOwner=GetSafeHwnd(); aXVldt'
bi.pszDisplayName=name; WcKDerc
bi.lpszTitle="Select folder"; qX-5/;n
bi.ulFlags=BIF_RETURNONLYFSDIRS; ~//9Nz~;3
LPITEMIDLIST idl=SHBrowseForFolder(&bi); {u1|`=;
if(idl==NULL) 2ak]&ll+h
return; k
$^/$N
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TU~y;:OJ
str.ReleaseBuffer(); mp$IhJ6#
m_Path=str; `Pj7:[."[
if(str.GetAt(str.GetLength()-1)!='\\') er3~gm
m_Path+="\\"; ^lV}![do!
UpdateData(FALSE); V>)/z|[
} MSM8wYcD
B;=Z^$%T
void CCaptureDlg::SaveBmp() }a5TY("d9H
{ y<- ]'Yts
CDC dc; g tMR/P:S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Fik;hB
CBitmap bm; "0;WYw?
int Width=GetSystemMetrics(SM_CXSCREEN); LZ_VLW9wE
int Height=GetSystemMetrics(SM_CYSCREEN); ,S`n?.&& 7
bm.CreateCompatibleBitmap(&dc,Width,Height); 5O]tkHYR
CDC tdc; U~ a\v8l~
tdc.CreateCompatibleDC(&dc); @Drl5C}+
CBitmap*pOld=tdc.SelectObject(&bm); SQK82/
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Jaw1bUP!oK
tdc.SelectObject(pOld); !|4]V}JQ
BITMAP btm; _dk[k@5W{'
bm.GetBitmap(&btm); Pa d)|
DWORD size=btm.bmWidthBytes*btm.bmHeight; vf.MSk?~ar
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ij4q &i"
BITMAPINFOHEADER bih; Posz|u<x
bih.biBitCount=btm.bmBitsPixel; J Y8Rk=
bih.biClrImportant=0; -d4v:Jab
bih.biClrUsed=0; `H:`JBe=+[
bih.biCompression=0; u,8)M'UU
bih.biHeight=btm.bmHeight; klQmo30i
bih.biPlanes=1; nn:'<6"oV
bih.biSize=sizeof(BITMAPINFOHEADER); dX1jn;7
bih.biSizeImage=size; >fP;H}S6
bih.biWidth=btm.bmWidth; +?"F=.SZ
bih.biXPelsPerMeter=0; KQ]sUNH
bih.biYPelsPerMeter=0; Ir>4- @
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); s;oe Qa}TB
static int filecount=0; bv]SR_Tiq
CString name; nrev!h
name.Format("pict%04d.bmp",filecount++); aB;f*x
name=m_Path+name; s1cu5eCt
BITMAPFILEHEADER bfh; LhAW|];
bfh.bfReserved1=bfh.bfReserved2=0; 3h.,7,T
bfh.bfType=((WORD)('M'<< 8)|'B'); eJ45:]_%I@
bfh.bfSize=54+size; y'^U4# (
bfh.bfOffBits=54; DQW)^j
h
CFile bf; l([aKm#
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D
)`(b
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); W3UxFs]$
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T:{&eWH
bf.WriteHuge(lpData,size); =ZURh_{xV
bf.Close(); T_Tu>wQX
nCount++; !~?/D
} MCibYvc[
GlobalFreePtr(lpData); P2jh[a%
if(nCount==1) Rjq\$aY}%
m_Number.Format("%d picture captured.",nCount); Wu{_QuAB
else 7$%G3Q|)L
m_Number.Format("%d pictures captured.",nCount); ZPE-
UpdateData(FALSE); em,1Yn?
} /YZMP'v
;[
Dxk$"
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %eofG]VM<
{ /Lr`Aka5
if(pMsg -> message == WM_KEYDOWN) *)w+xWmM3w
{ #3_g8ni5X
if(pMsg -> wParam == VK_ESCAPE) 9VTAs:0D=
return TRUE; EQ^]W-gN
if(pMsg -> wParam == VK_RETURN) R$l-
7YSt
return TRUE; bFN/{^SB
} !YGHJwW:
return CDialog::PreTranslateMessage(pMsg); N5zWeFq@6
} )N- '~<N
64U|]gd$
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vv(buG
{ FD E?O]^
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .+XK>jl+
SaveBmp(); G.L}VpopM
return FALSE; ^(+q1O'
} cOdRb=?9
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ b1#C,UWK
CMenu pop; :t`W&z41
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); oZ/"^5
CMenu*pMenu=pop.GetSubMenu(0); zOSUYn
pMenu->SetDefaultItem(ID_EXITICON); cA4?[F
CPoint pt; bl>W i@GL
GetCursorPos(&pt); E-Xz
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9[VYd '
if(id==ID_EXITICON) ;0m J4G
DeleteIcon(); NX%1L!
#
else if(id==ID_EXIT) 6|q"lS*$S
OnCancel(); q
j21#q
.
return FALSE; Peph..8 Z
} y>t:flD*
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &uE )Vr4 R
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N`IXSE
AddIcon(); ~),%w*L
return res; ws`r\k]3J
} x7E] }h
AKjobA#
void CCaptureDlg::AddIcon() /f?;,CyI
{ #FAW@6QG
NOTIFYICONDATA data; /2T
W?a
data.cbSize=sizeof(NOTIFYICONDATA); \; '#8
CString tip; d!T,fz/-.
tip.LoadString(IDS_ICONTIP); %K3U`6kHcd
data.hIcon=GetIcon(0); v7@"9Uw}
data.hWnd=GetSafeHwnd(); 5|eX@?QF58
strcpy(data.szTip,tip); J&'*N:d
data.uCallbackMessage=IDM_SHELL; d_$0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -:d{x#
data.uID=98; dL4VcUS.
Shell_NotifyIcon(NIM_ADD,&data); |=:@<0.'
ShowWindow(SW_HIDE); -a_qZ7
bTray=TRUE; bQI :N
} ]7k:3"wH
8wd["hga<%
void CCaptureDlg::DeleteIcon() 9+m>|"F0
{ <Tgubv+J
NOTIFYICONDATA data; 1&e8vVN
data.cbSize=sizeof(NOTIFYICONDATA); [-l>fP0
data.hWnd=GetSafeHwnd(); 8g{Mv#b%
data.uID=98; x1wD`r
Shell_NotifyIcon(NIM_DELETE,&data); H(n
fHp.3
ShowWindow(SW_SHOW); WLU_t65
SetForegroundWindow(); *^]
ShowWindow(SW_SHOWNORMAL); 3)>re&
bTray=FALSE; X$ul=iBs
} @ ^F{
"'``O~08/
void CCaptureDlg::OnChange() 1r.2bL*~jw
{ lrHN6:x(Y4
RegisterHotkey(); GNmP_N
} UK^w;w2F
1S(oi
BOOL CCaptureDlg::RegisterHotkey() T;Kv<G;
{ J_&cI%.
UpdateData();
vxPr)"Vvz
UCHAR mask=0; tq}sedYhee
UCHAR key=0; 6v:L8t$"
if(m_bControl) /o$6"~t
mask|=4; "dndhoMq
if(m_bAlt) !X"nN9k
mask|=2; '.pGkXyQ
if(m_bShift) ]5*H/8Ke7
mask|=1; n3V$Xtxw
key=Key_Table[m_Key.GetCurSel()]; M-Vz$D/aed
if(bRegistered){ R$}Hv
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3_;=y\F
bRegistered=FALSE; `xv Uq\
} ^=-25%&^
cMask=mask; lws.;abm%n
cKey=key; h){ #dU+&
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @/As|)
return bRegistered; 4?(=?0/[
} (K6vXq.;\\
*j,noHUT~>
四、小结 N!?~Dgw
&~.|9P/45
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。