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:
I5x/N.
5j]}/Aq 一、实现方法
8:s3Q`O uN$X3Ls_ 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
m7M*)N8 kJDMIh|g #pragma data_seg("shareddata")
WO)K*c1F HHOOK hHook =NULL; //钩子句柄
a'T|p)N.;T UINT nHookCount =0; //挂接的程序数目
kdmVHiGF static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
xY!]eLZ)& static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+,|-4U@dl static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
i6X/`XW' static int KeyCount =0;
kN}.[enI~ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
E0)v;yRcw #pragma data_seg()
:=i0$k<E/ r`S]`&#}( 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
#e9B|Y?b QT|m N 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:
-Q$$2QW! |_w*:NCV5 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
KO5Q;H cKey,UCHAR cMask)
"V9!srIC {
sL\|y38' BOOL bAdded=FALSE;
?L'k2J for(int index=0;index<MAX_KEY;index++){
5mFi)0={y if(hCallWnd[index]==0){
e,4!/|H: hCallWnd[index]=hWnd;
DG:=E/ @ HotKey[index]=cKey;
N`zHe*=[~ HotKeyMask[index]=cMask;
8L|C&Ymj bAdded=TRUE;
B'
:ZX-Q) KeyCount++;
Ab(bvS8r$ break;
Y/$SriC_+' }
F8=6!Qj }
%
tJ?dlD' return bAdded;
<=7p~
i5 }
aoJ&< vl3 //删除热键
|2oB3 \)/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|RjjP 7 {
S((8DSt* BOOL bRemoved=FALSE;
{K|{a for(int index=0;index<MAX_KEY;index++){
}F3Z~ if(hCallWnd[index]==hWnd){
SjJUhTb if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Iy,)>V%iZV hCallWnd[index]=NULL;
de`6%%| HotKey[index]=0;
RV($G8U HotKeyMask[index]=0;
5o72X k bRemoved=TRUE;
zh4o<f:- KeyCount--;
}BfwMq4E)n break;
~]yqJYiid^ }
9<YB&:< }
S3=J1R, }
K3Xy%pqR# return bRemoved;
S\X_!| }
_ Po9pZ Bo0y"W[+ jG^~{7# DLL中的钩子函数如下:
?Z!KV= u(o @_6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
DBv5Og {
!*cf}<Kmw BOOL bProcessed=FALSE;
S_QDYnF)` if(HC_ACTION==nCode)
$_ NaxV {
~kHir]jc if((lParam&0xc0000000)==0xc0000000){// 有键松开
*PI3L/* switch(wParam)
Hv=coS>g: {
@V-ZV case VK_MENU:
6%'{Cq1DE MaskBits&=~ALTBIT;
P*LcWrK break;
Ltj}>.+ case VK_CONTROL:
Mfz5:' MaskBits&=~CTRLBIT;
dn5v|[ dJ break;
3LTO+>, |" case VK_SHIFT:
UkYQ<MNO MaskBits&=~SHIFTBIT;
4R0_%x6vG break;
-@73" w/ default: //judge the key and send message
v_ J.M ] break;
}E=kfMu }
q+DH2&E' for(int index=0;index<MAX_KEY;index++){
G]S E
A if(hCallWnd[index]==NULL)
vIRE vj#U continue;
-Rvxjy)[N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@Yg7F>s {
d}G?iX;c} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
\uYUX~}i" bProcessed=TRUE;
]@f6O*&= }
kal8k-$# }
[0}471 }
yO6i "3 else if((lParam&0xc000ffff)==1){ //有键按下
wiVQMgi` switch(wParam)
}/LYI {
vW_A.iI"e case VK_MENU:
)FP|}DCxQ MaskBits|=ALTBIT;
]`NbNr]K break;
X1-s,[j' case VK_CONTROL:
70NHU;&N MaskBits|=CTRLBIT;
Z 0:2x(x9 break;
r:q#l~;^ case VK_SHIFT:
1t0FJ@)* MaskBits|=SHIFTBIT;
7HJv4\K break;
5bw]cv$i default: //judge the key and send message
QA3l:D}u break;
zm:=d>D.. }
y(R*Z^c}d, for(int index=0;index<MAX_KEY;index++){
y"hM6JI if(hCallWnd[index]==NULL)
J'EK5=H continue;
EH3G|3^xz if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W>~%6K>p {
W
wE)XE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
P=@lkF!\# bProcessed=TRUE;
mx[^LaR>v }
LJ)) }
2%8Y-o? }
Dmi;# WY if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
9e&#;6l for(int index=0;index<MAX_KEY;index++){
JXAyF6
$ if(hCallWnd[index]==NULL)
NQJqS?^W&M continue;
OT[m
g4& if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
P~<93 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
c 2@@Rd~M //lParam的意义可看MSDN中WM_KEYDOWN部分
`|w#K28t" }
9vTQ^*bm }
$.1'Ym }
kn"x[{d return CallNextHookEx( hHook, nCode, wParam, lParam );
O}-7 V5 }
=Q}mJs w'0M>2 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:
0q>lW &J EAB+kY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
[J`G`s! BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
QL2y,?Mz7 `Cf
en8 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:
f5% & g)A0PvEu LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
:\JbWj_j {
I
6YT|R if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
"V0:Lq {
9u @h` //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
-C}59G8 SaveBmp();
_0["J:s9 return FALSE;
b6Hk20+B; }
.K1E1Z_ …… //其它处理及默认处理
$jm<'
4 }
p.] .M"A %QgAilj, 5{0>7c|. 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
YiuOu(X '?gIcWM 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
FTnQqDuT ,M&0<k\ 二、编程步骤
Gy6qLM w00\1'-Kz 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
5b`xN!c Z_ gVYa 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
R(83E
B~_ ]MLLr'6? 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
ynbpew aa ~!-8l&C 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
j~S!!Z] %)Uvf`Xhh4 5、 添加代码,编译运行程序。
H\+c'$ B=bI'S8\ 三、程序代码
%Fg8l{H3 e_k
_ty` ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
XH:gQ 9FD #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
)g:,_ 1s)| #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
EY&C[= #if _MSC_VER > 1000
n~ >h4=h #pragma once
VUC <0WV #endif // _MSC_VER > 1000
sp
Q4m #ifndef __AFXWIN_H__
J+@MzkpK #error include 'stdafx.h' before including this file for PCH
f3zfRhkIk #endif
5BU%%fBJ. #include "resource.h" // main symbols
hC|5e|S class CHookApp : public CWinApp
[ZKtbPHb {
jSie&V@ px public:
']ITuP8 CHookApp();
(:?5 i` // Overrides
*K+jsVDY // ClassWizard generated virtual function overrides
s%N` //{{AFX_VIRTUAL(CHookApp)
\!UF|mD^tG public:
<78$]Z2we virtual BOOL InitInstance();
]27>a"p59Y virtual int ExitInstance();
s;B
j7] //}}AFX_VIRTUAL
R3B5-^s //{{AFX_MSG(CHookApp)
! fi &@k // NOTE - the ClassWizard will add and remove member functions here.
S2rEy2\}: // DO NOT EDIT what you see in these blocks of generated code !
ka5#<J7<p //}}AFX_MSG
?kL|>1TY DECLARE_MESSAGE_MAP()
4_Qa=T8 };
r,2Xu LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
%[]"QbF? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
gp~yt0AU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
SON^CvMs{ BOOL InitHotkey();
T-a&e9B BOOL UnInit();
7tpAZ<{ #endif
'}jf#C1$c xm<v">< //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
FOOQ'o[} #include "stdafx.h"
,f8}q]FTA #include "hook.h"
5^/,aI #include <windowsx.h>
k{gl^ #ifdef _DEBUG
VHXI@UT* #define new DEBUG_NEW
+1otn~(E #undef THIS_FILE
|d,F-9iw static char THIS_FILE[] = __FILE__;
oLgg #endif
J[e} #define MAX_KEY 100
2y3?!^$ #define CTRLBIT 0x04
]3n , AHA #define ALTBIT 0x02
B#FHf
Z #define SHIFTBIT 0x01
)R jb/3*! #pragma data_seg("shareddata")
h&)fu{ HHOOK hHook =NULL;
kCj`V2go UINT nHookCount =0;
H@K#|A=a static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
R[x7QlA; static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Yo >`h2C4 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
B4`2.yRis static int KeyCount =0;
J'oDOn.M static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
FoE|Js #pragma data_seg()
!Tv?%? 2l HINSTANCE hins;
nN>J*02( void VerifyWindow();
r
eGm> BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
b6 $,Xh //{{AFX_MSG_MAP(CHookApp)
8]S,u:E:N // NOTE - the ClassWizard will add and remove mapping macros here.
3\;v5D: // DO NOT EDIT what you see in these blocks of generated code!
>BBl7 //}}AFX_MSG_MAP
eymi2-a< END_MESSAGE_MAP()
\ jECSV| 7; p4Wg7k} CHookApp::CHookApp()
,Kuk_@(}5~ {
N? M // TODO: add construction code here,
m;dm|4L^ // Place all significant initialization in InitInstance
.:rmA8U[ }
Rv98\VD" }i(qt&U; CHookApp theApp;
t{!/#eQC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
'iJDWxCD {
=4eUAeH {w BOOL bProcessed=FALSE;
:4|M
jn if(HC_ACTION==nCode)
u^Vh.g] {
g6WPPpqus if((lParam&0xc0000000)==0xc0000000){// Key up
[!EXMpq' switch(wParam)
~8TF*3[}[ {
98GlhogWt case VK_MENU:
N#4N?BBP" MaskBits&=~ALTBIT;
K}x_nW break;
_g[-=y{Bb case VK_CONTROL:
/#f^n]v MaskBits&=~CTRLBIT;
>-M ]:=L break;
Y(_KizBY case VK_SHIFT:
JBz}|MD MaskBits&=~SHIFTBIT;
6JhMkB^h break;
uVGa(4u} default: //judge the key and send message
+Gow5-( break;
Oa!
m
}
@D~B{Hg for(int index=0;index<MAX_KEY;index++){
`z9J`r=I if(hCallWnd[index]==NULL)
UP2}q?4 continue;
>)NQH9'1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ry?4h\UX5 {
?Nf
5w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
>.e+S?o bProcessed=TRUE;
}x:0os }
A?8\Y{FQ }
?DPHo)w }
?sXG17~Bm else if((lParam&0xc000ffff)==1){ //Key down
9C/MRmv` switch(wParam)
)1lu=gc {
$e
}n case VK_MENU:
}^Gd4[(,g MaskBits|=ALTBIT;
8O7Yv< break;
{:bN/zV# case VK_CONTROL:
'N\&<dT> MaskBits|=CTRLBIT;
&J$##B break;
e\F}q)_ case VK_SHIFT:
?,)"~c$hZ MaskBits|=SHIFTBIT;
l+[czb~ break;
~}'F887 f default: //judge the key and send message
e)@3m. break;
&w85[zs }
iidT~l for(int index=0;index<MAX_KEY;index++)
bMm3F%FFq& {
\S4SI if(hCallWnd[index]==NULL)
Xgat-cy'DA continue;
<{Q'&T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Xj@+{uvQB {
=lp1Z> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
N|K4{Frm bProcessed=TRUE;
Elb aFbr }
^zr^ N?a }
t
Rm+? }
hH>``gK if(!bProcessed){
(=u'sn:s for(int index=0;index<MAX_KEY;index++){
TQ]dW if(hCallWnd[index]==NULL)
.c+9P<VmC} continue;
Q.Aa{d9e if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!wE}(0BTx SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
h4)Bs\==mT }
w0lT%CPx }
wTc)S6%7 }
w7TJv4_ return CallNextHookEx( hHook, nCode, wParam, lParam );
=(o']ZaaA }
=&nW~<- v ZZxk]D< BOOL InitHotkey()
,$lemH1d {
WsGths+[ if(hHook!=NULL){
iE].&>w nHookCount++;
!t#F/C return TRUE;
(?0`d }
pG3k else
/F)H\* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3Q^fVn$tk if(hHook!=NULL)
P-`(0M7^ nHookCount++;
9=`W p6Gmn return (hHook!=NULL);
M@et6aud;K }
fyknP)21I BOOL UnInit()
5GzFoy)j> {
I\O\,yPhhP if(nHookCount>1){
^teq[l$; nHookCount--;
Smw QET<H return TRUE;
Of,2Q#oji }
OHv! BOOL unhooked = UnhookWindowsHookEx(hHook);
@(g_<@Jz if(unhooked==TRUE){
*ISZlR\# nHookCount=0;
Lh.b5Q| hHook=NULL;
^x>Qf(b }
n2B){~vE return unhooked;
NoE*/!Sr }
]:M0Kj&h (V`Md\NL` BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
hj%ye~|~ {
Q4*?1`IsR BOOL bAdded=FALSE;
l7H
qo) for(int index=0;index<MAX_KEY;index++){
"hxN !,DEZ if(hCallWnd[index]==0){
Fb`a~c~s hCallWnd[index]=hWnd;
GzXUU@p HotKey[index]=cKey;
#G" xNl HotKeyMask[index]=cMask;
f5AjJYq1 bAdded=TRUE;
E>'a,!QPv KeyCount++;
P262Q&.}d break;
tG vG }
_|[UI.a }
]V l]XT$Um return bAdded;
[qUN 4x5b }
nRL. ppUI !U9|x\BqJ2 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
I-y#Ks1p+ {
7w,FX.=;cv BOOL bRemoved=FALSE;
c0B|F for(int index=0;index<MAX_KEY;index++){
c\B|KhDk if(hCallWnd[index]==hWnd){
|F,R&<2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
C2LL|jp* hCallWnd[index]=NULL;
eAv4FA4g HotKey[index]=0;
;<yd^Xs HotKeyMask[index]=0;
*n"/a{6> bRemoved=TRUE;
dm0QcW4 KeyCount--;
S5~VD?O, break;
Ya>oCr}K }
(" LQll9 }
qmO6,T-| }
&j(+ /;A return bRemoved;
G9g1hie@% }
yjfat&$
.ObZ\.I void VerifyWindow()
;};wq&b# {
hxCvk/7sT for(int i=0;i<MAX_KEY;i++){
"Rn3lj0 if(hCallWnd
!=NULL){ ?A(QyaKz
if(!IsWindow(hCallWnd)){ @u==x*{|
hCallWnd=NULL; fRg`UI4w}
HotKey=0; ^Ge+~o?x
HotKeyMask=0; _g1b{$
KeyCount--; 2M#r]
} ylt`*|$
} 0a-:<zm
} 626Z5Afg
} ^i:`ZfA#
Cvn#=6V3
BOOL CHookApp::InitInstance() 8\{^|y9-
{ w@N
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Q}-~O1
hins=AfxGetInstanceHandle(); )M)7"PC
InitHotkey(); V<Z[ nq
return CWinApp::InitInstance(); aN"DkUYZM
} r*Yi1j/
76u&EG%
int CHookApp::ExitInstance() 5nsq[Q`
{ eImn+_ N3
VerifyWindow(); e^.Fa59
UnInit(); 4~B>
9<$e>
return CWinApp::ExitInstance(); G "73=8d
} aH^RoG}
N^3N[lD{
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file cReB~wk
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {mAU3x
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lbpq_=
#if _MSC_VER > 1000 -wjN"g<
#pragma once ]CoeSA`j
#endif // _MSC_VER > 1000 uDEvzk42
OoWyPdC+P
class CCaptureDlg : public CDialog ;<leKcvhQ&
{ Yb E-6|cz
// Construction /iX+ R@
public: U\Z?taXB
BOOL bTray; V,$0p1?J
BOOL bRegistered; u,&^&0K,
BOOL RegisterHotkey(); WL'P)lI5
UCHAR cKey; ?mwD*LN3o
UCHAR cMask; M@5?ZZ4L
void DeleteIcon(); '#k0a,<N
void AddIcon(); p\<u6v ~J
UINT nCount; dH-s2r%s
void SaveBmp(); ['T:ea6B
CCaptureDlg(CWnd* pParent = NULL); // standard constructor lBaR
// Dialog Data wu)w
//{{AFX_DATA(CCaptureDlg) E@ESl0a;
enum { IDD = IDD_CAPTURE_DIALOG }; ho$+L
CComboBox m_Key; YGrg
BOOL m_bControl; ({q?d[q[
BOOL m_bAlt;
YxP&7oq
BOOL m_bShift; :53)Nv
CString m_Path; Ry'= ke
CString m_Number; )BwjZMJ.N
//}}AFX_DATA ;1a~pF S
// ClassWizard generated virtual function overrides RRI"d~~F6
//{{AFX_VIRTUAL(CCaptureDlg) v#!%GEg1r
public: :3I@(k\PY
virtual BOOL PreTranslateMessage(MSG* pMsg); |>#{[wko
protected: ^_f+15]D
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "T|PS6R~
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]bK=FIK2
//}}AFX_VIRTUAL #*KNPh
// Implementation f`;j:O
protected: 8@tPm$
HICON m_hIcon; s#WAR]x0x
// Generated message map functions L>3x9
//{{AFX_MSG(CCaptureDlg) i{`;R
virtual BOOL OnInitDialog(); `tn{ei
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); m8o(J\]
afx_msg void OnPaint(); K|Di1)7=/
afx_msg HCURSOR OnQueryDragIcon(); F 9@h|#an
virtual void OnCancel(); WUh$^5W
afx_msg void OnAbout(); aL&n[
afx_msg void OnBrowse(); wf:OK[r9
afx_msg void OnChange(); eb =D/
//}}AFX_MSG BDjn
!3
DECLARE_MESSAGE_MAP() c5u@pvSP
}; }3OKC2K~
#endif Ym =FgM\
#N`~xZ|$
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file RE/~#k@a
#include "stdafx.h" ;<(W% _
#include "Capture.h" 6BCf:mqP
#include "CaptureDlg.h" RH&~+5
#include <windowsx.h> '7iSp=
#pragma comment(lib,"hook.lib") p{j.KI s7
#ifdef _DEBUG [x,>?~6ek
#define new DEBUG_NEW H{=21\a\
#undef THIS_FILE Yo|,]X>/
static char THIS_FILE[] = __FILE__; %@6}GmK^
#endif #6CC3TJ'k
#define IDM_SHELL WM_USER+1 (aH'h1,G
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .%L?J E
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {o.FlX
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;,?KI$K
class CAboutDlg : public CDialog 'LO^<
{ y9>ZwYN
public: 0sfr d
CAboutDlg(); z}*9uZ
// Dialog Data &3n~%$#N
//{{AFX_DATA(CAboutDlg) }<9cL'
enum { IDD = IDD_ABOUTBOX }; Pc
NkAo
//}}AFX_DATA f)^_|8
// ClassWizard generated virtual function overrides Ht&:-F+dm
//{{AFX_VIRTUAL(CAboutDlg) C<m{*C-`a
protected: e,Uo#T6J
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xUa{1!Y8
//}}AFX_VIRTUAL cT!\{~
// Implementation `Ch9~*p
protected:
?B}{GL2)
//{{AFX_MSG(CAboutDlg) +PcmJ
//}}AFX_MSG VB,?Mo}R
DECLARE_MESSAGE_MAP() E: $P=%b
}; d\jPdA.a=
^$'z!+QRM
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0a-0Y&lQm
{ Vv.|br`;}
//{{AFX_DATA_INIT(CAboutDlg) x6e}( &p*
//}}AFX_DATA_INIT v33dxZ'
} xT+zU} z
[Z}9>~m
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !U'QqnT
{ 3<
2}V
CDialog::DoDataExchange(pDX); iC98_o_9
//{{AFX_DATA_MAP(CAboutDlg) DUC#NZgw
//}}AFX_DATA_MAP '<ZlGFt'n
} (4dhuT
:n.f_v}6
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _YLfL
//{{AFX_MSG_MAP(CAboutDlg) @jsDq
Ln
// No message handlers Q=/</|
//}}AFX_MSG_MAP
ng_^
END_MESSAGE_MAP() LYaZ1*
b;cdIl!3
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) bdF.qO9
: CDialog(CCaptureDlg::IDD, pParent) RWgNo#<
{ 'F$l{iR
//{{AFX_DATA_INIT(CCaptureDlg) b/{t|io{
m_bControl = FALSE; NR5oIKP?
m_bAlt = FALSE; lMg+R<$~I
m_bShift = FALSE; I/L_@X<*r
m_Path = _T("c:\\"); E~gyy]8&
m_Number = _T("0 picture captured."); obNqsyc77R
nCount=0; '{V0M<O
bRegistered=FALSE; i-6F:\;
bTray=FALSE; DIzH`|Y
//}}AFX_DATA_INIT Y<Fz)dQo
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %Cv D-![0
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); aM:nOt" S1
} }#Qc \eud
.[JYj(p
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ZfgJ.<<
{ viMzR(JU
CDialog::DoDataExchange(pDX); p~,]*y:XT
//{{AFX_DATA_MAP(CCaptureDlg) oze&
DDX_Control(pDX, IDC_KEY, m_Key); vDxe/x%
DDX_Check(pDX, IDC_CONTROL, m_bControl); %]8qAtV^3j
DDX_Check(pDX, IDC_ALT, m_bAlt); jhg;%+KB
DDX_Check(pDX, IDC_SHIFT, m_bShift); U2wbv Xr5-
DDX_Text(pDX, IDC_PATH, m_Path); XAe%m^
DDX_Text(pDX, IDC_NUMBER, m_Number); "G@g" gP
//}}AFX_DATA_MAP IuRmEL_Q_
} M #=]
k
NF0%}II&xK
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Wv/%^3
//{{AFX_MSG_MAP(CCaptureDlg) ~(IB0=A{v
ON_WM_SYSCOMMAND() 2h=!k|6
ON_WM_PAINT() CS=qj-(
ON_WM_QUERYDRAGICON() naw0$kXTA
ON_BN_CLICKED(ID_ABOUT, OnAbout) [.S#rGYk
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4W)B'+ZK8
ON_BN_CLICKED(ID_CHANGE, OnChange) 2m35R&
//}}AFX_MSG_MAP yz LpK;
END_MESSAGE_MAP() j"|=C$Kn/
m$W <
BOOL CCaptureDlg::OnInitDialog() %d(^d
{ B&.FOO
CDialog::OnInitDialog(); v(-{=*':
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); q"<ac qK
ASSERT(IDM_ABOUTBOX < 0xF000); z3K6%rb-
CMenu* pSysMenu = GetSystemMenu(FALSE); <B6&I$Wc+
if (pSysMenu != NULL) Z]j*9#G1s
{ $d)ca9
CString strAboutMenu; q&/Yg,p\
strAboutMenu.LoadString(IDS_ABOUTBOX); Qkd<sxL
if (!strAboutMenu.IsEmpty()) K_El&
{ !>e5z|1
pSysMenu->AppendMenu(MF_SEPARATOR); G1"zElug
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y))u&*RuT0
} <Gt2(;
} !2'jrJGc
SetIcon(m_hIcon, TRUE); // Set big icon |&[L?
SetIcon(m_hIcon, FALSE); // Set small icon l-s!A(l
m_Key.SetCurSel(0); n ;$5Cq!v=
RegisterHotkey(); IuOgxm~Y
CMenu* pMenu=GetSystemMenu(FALSE); k?z98 >4
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2cq I[t@0
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w -
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pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AQ+]|XYo_
return TRUE; // return TRUE unless you set the focus to a control O km{Xx
} ,>:;#2+og
]"1`+q6i
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .Y3pS/VI
{ D!.+Y-+Xzu
if ((nID & 0xFFF0) == IDM_ABOUTBOX) \yd
s5g!:
{ ld^=#]g
CAboutDlg dlgAbout; @W^| ?
dlgAbout.DoModal(); DVK)2La
} hlJq-*6'
else NDs!a
{ Bnb#{tL
CDialog::OnSysCommand(nID, lParam); OnF3l Cmu
} '{J&M|<A
} ;B?DfWX
+[R/=$
void CCaptureDlg::OnPaint() YQpSlCCo
3
{ <%Ostqj
if (IsIconic()) mdq;R*`
{ ;Ww7"-=sw
CPaintDC dc(this); // device context for painting Q"t<3-"
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j~+>o[c
// Center icon in client rectangle EC\yzH*X
int cxIcon = GetSystemMetrics(SM_CXICON); 59!Fkd3
int cyIcon = GetSystemMetrics(SM_CYICON); Pp|*J^U 4
CRect rect; rDQ!zlg>l
GetClientRect(&rect); AN24Sf'`
int x = (rect.Width() - cxIcon + 1) / 2; (vB<%l.&
int y = (rect.Height() - cyIcon + 1) / 2; KGWyJ
// Draw the icon V0%V5>
dc.DrawIcon(x, y, m_hIcon); g =2Rqi5
} .>mr%#p
else >TP7 }u|
{ ]Lm9^q14m
CDialog::OnPaint(); Vg>( Y,
} '/$d0`3B>
} ]_8qn'7
N @#c,,
HCURSOR CCaptureDlg::OnQueryDragIcon() 9!Ar`Io2@
{ g"L|n7_b
return (HCURSOR) m_hIcon; *0}3t<5
} -CR?<A4mud
XO9M_*Va
void CCaptureDlg::OnCancel() 0q*r
{ 4<?8M vF
if(bTray) s-RQMK}H
DeleteIcon(); *$"gaXI
CDialog::OnCancel(); m1IKVa7-\}
} ? B E6
!j\" w p
void CCaptureDlg::OnAbout() js8{]04y
{ dTL5-@
CAboutDlg dlg; eh ,~F
dlg.DoModal(); x+h~gckLb
} Mze;k3
`zR+ tbm
void CCaptureDlg::OnBrowse() 8UMFq
{ |hO~X~P
CString str; 8srBHslI
BROWSEINFO bi; g
>'p>}t
char name[MAX_PATH]; Bcjx>#3?L
ZeroMemory(&bi,sizeof(BROWSEINFO)); DEw8*MN
bi.hwndOwner=GetSafeHwnd(); /\w)>0
bi.pszDisplayName=name; )OLq_':^@
bi.lpszTitle="Select folder"; qA:#iJ8w
bi.ulFlags=BIF_RETURNONLYFSDIRS; $%%os6y2v
LPITEMIDLIST idl=SHBrowseForFolder(&bi); p)=~% 7DV
if(idl==NULL) 1N\D5g3
return;
c\q
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %"X-&1vV
str.ReleaseBuffer(); t'~/$=9}
m_Path=str; 6MG9a>=
if(str.GetAt(str.GetLength()-1)!='\\') >F@qpjoQE
m_Path+="\\"; =rd|0K"(r
UpdateData(FALSE); ?|1Mv1C?
} ]u-02g
7P B)'Wl"6
void CCaptureDlg::SaveBmp() $x#FgD(iI
{ Ox#Q2W@Uy
CDC dc; }%-t+Tf,
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,=~z6[
CBitmap bm; d$Y7u
int Width=GetSystemMetrics(SM_CXSCREEN); !~ZP{IXyo
int Height=GetSystemMetrics(SM_CYSCREEN); jDRe)bo4
bm.CreateCompatibleBitmap(&dc,Width,Height); m))<!3
CDC tdc; '>k{tPi.
tdc.CreateCompatibleDC(&dc); \#rO!z
d
CBitmap*pOld=tdc.SelectObject(&bm); kL90&nP
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QJW`}`R
tdc.SelectObject(pOld); >m'x8xB=
BITMAP btm; 8CC/ BOe
bm.GetBitmap(&btm);
Q2p)7G
DWORD size=btm.bmWidthBytes*btm.bmHeight; O%f8I'u$
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9]>iSG^H
BITMAPINFOHEADER bih; rxO2js
bih.biBitCount=btm.bmBitsPixel; m9md|yS
bih.biClrImportant=0; _0pO8o-x
bih.biClrUsed=0; %vO<9fE|1
bih.biCompression=0; ;50_0Mv;(:
bih.biHeight=btm.bmHeight; +jqj6O@Tjr
bih.biPlanes=1; S :8OQI
bih.biSize=sizeof(BITMAPINFOHEADER); l+y}4k=/
bih.biSizeImage=size; [WB{T3j
bih.biWidth=btm.bmWidth; ?`zgq>R}w[
bih.biXPelsPerMeter=0; #)`A7 $/,
bih.biYPelsPerMeter=0; (shK
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -@IL"U6
static int filecount=0; pl V7+?G
CString name; [rreFSy#@
name.Format("pict%04d.bmp",filecount++); :&J8.G^
name=m_Path+name; ]]cYLaq(
BITMAPFILEHEADER bfh; g6sjc,`
bfh.bfReserved1=bfh.bfReserved2=0; -qe bQv
bfh.bfType=((WORD)('M'<< 8)|'B'); i_F$&?)
bfh.bfSize=54+size; cX
A t:m
bfh.bfOffBits=54; b>~RSO*
CFile bf; (tl}q3U
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t]^_l$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ., :uZyG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hN(L@0)
bf.WriteHuge(lpData,size); 3AlqBXE"Z<
bf.Close(); "]t>ZT:OJ
nCount++; }.:d#]g8
} sIm#_+Y
GlobalFreePtr(lpData); djT.
1(
if(nCount==1) zH'2s-.bi
m_Number.Format("%d picture captured.",nCount); %^9:%ytt
else b4 hIeBI\
m_Number.Format("%d pictures captured.",nCount); c6b0*!D"}
UpdateData(FALSE); l_v*7d
} M^H90GN)X
74zSP/G'
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >;i\v7
{ 4YJ=q% G
if(pMsg -> message == WM_KEYDOWN) *`KrVu 6s
{ 2q%K)h
if(pMsg -> wParam == VK_ESCAPE) , deUsc
return TRUE; y3yvZD
if(pMsg -> wParam == VK_RETURN) %yaG,;>U
return TRUE; KtMbze
} /84bv=
return CDialog::PreTranslateMessage(pMsg); 7C5pAb:
} j??tmo
KzkgWMM
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w4{y"A
{ Lh 9S8EU
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nC~fvyd<P
SaveBmp(); +5*vABvCu
return FALSE; p^8JLC
} G&o64W;-s
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T_~KxQ
CMenu pop; RqGVp?
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); BPWnck=%
CMenu*pMenu=pop.GetSubMenu(0); ~Oh=
pMenu->SetDefaultItem(ID_EXITICON); d~<QAh#rG
CPoint pt; pb$fb
GetCursorPos(&pt); zKJ.Tj W
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G{A)H_o*
if(id==ID_EXITICON) L*O>IQh2
DeleteIcon(); MW]8;`|jC
else if(id==ID_EXIT) p!GZCf,
OnCancel(); M]B3vPA/v
return FALSE; DVzssPg
} p1
4d,}4W
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vpa fru4
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) RH=$h! 5
AddIcon(); 9>{t}Id
return res; `r]TA]DR
} HZuiVW8
}3sN+4
void CCaptureDlg::AddIcon() (+x]##Q
{ 6oA~J]<
NOTIFYICONDATA data; /u?9S/
data.cbSize=sizeof(NOTIFYICONDATA); {,F/KL^u
CString tip; aG
Ef#A
tip.LoadString(IDS_ICONTIP); RnSm]}?
data.hIcon=GetIcon(0); QmHwn)Ly
data.hWnd=GetSafeHwnd(); }\4p3RQrz
strcpy(data.szTip,tip); I<xy?{s
data.uCallbackMessage=IDM_SHELL; v D&Kae<
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @9<S*
data.uID=98; a6qwL4
Shell_NotifyIcon(NIM_ADD,&data); =
uk`pj[l
ShowWindow(SW_HIDE); yP%o0n/"x
bTray=TRUE; ;'hi9L
} +]_nbWL(%
s~)L_ p
void CCaptureDlg::DeleteIcon() e^Aa!
{ +h|K[=l\
NOTIFYICONDATA data; a(5y>HF
data.cbSize=sizeof(NOTIFYICONDATA); 8Y xhd
.
data.hWnd=GetSafeHwnd(); %awVVt{aG
data.uID=98; <g*.p@o
Shell_NotifyIcon(NIM_DELETE,&data); bz$Qk;m=H
ShowWindow(SW_SHOW); 0w'|d@*wV
SetForegroundWindow(); L!&$c&=xf
ShowWindow(SW_SHOWNORMAL); ^aT;aP^l
bTray=FALSE; >"O1`xdG
} :;q>31:h
fMyE}z
void CCaptureDlg::OnChange() [h^f%
{ Ogd8!'\
RegisterHotkey(); ^W5>i[
} _ r~+p
rv`2*B
BOOL CCaptureDlg::RegisterHotkey() )F
+nSV;
{ 2|$lk8 /,
UpdateData(); kAY@^vi
UCHAR mask=0; xkF$D:sP
UCHAR key=0; aN:HG)$@
if(m_bControl) I'xC+nL@
mask|=4; .|U4N/XN%q
if(m_bAlt) >kt~vJI
mask|=2; }Z"28?
if(m_bShift) I Jqv w
mask|=1; y-%nJD$
key=Key_Table[m_Key.GetCurSel()]; @l)\?IEF@f
if(bRegistered){ [k!-;mi
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7Nd*,DV_
bRegistered=FALSE; 1 pa*T!
} tF<^9stM
cMask=mask; 4=~ 9v
cKey=key; Ft )t`E'%j
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {ms,q_Zr
return bRegistered; nt drXg
} p(~Y"
H
t'dHCp}
四、小结 ?]s%(R,B5
G(:s-x ig6
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。