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:
= V , _
gdT_kb5HL8 一、实现方法
vP2QAGk< !L_ SHlU 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:
I6fpXPP). -a[{cu{ #pragma data_seg("shareddata")
>tzXbmFp; HHOOK hHook =NULL; //钩子句柄
_7 ;^od=C UINT nHookCount =0; //挂接的程序数目
#+G2ZJxL| static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
P:TpB6.=q static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
qw/{o:ce] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
00p 7sZU^ static int KeyCount =0;
Ed-gYL^< static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
2I<T<hFW] #pragma data_seg()
mI0r,Z*+M MD)"r>k 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。
D^{:UbN Z^l!y5s/H 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:
ChGM7uu2 $Da^z[8e BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
"m3Y))a cKey,UCHAR cMask)
v\eBL&WK {
a\w|tf BOOL bAdded=FALSE;
\2,18E for(int index=0;index<MAX_KEY;index++){
(AYS>8O& if(hCallWnd[index]==0){
1sjn_fPz hCallWnd[index]=hWnd;
_ XZ=4s HotKey[index]=cKey;
h"ylpv+ HotKeyMask[index]=cMask;
OKVYpf bAdded=TRUE;
<&2,G5XA KeyCount++;
=1VH5pVr} break;
m { fQL }
ar|[D7Xrq\ }
\gkajY-? return bAdded;
q9!9OcN2 }
l/^-:RRNKi //删除热键
8957$g BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
v~Qy{dn
P {
zTB9GrU BOOL bRemoved=FALSE;
E2|iAT+=. for(int index=0;index<MAX_KEY;index++){
obq}# if(hCallWnd[index]==hWnd){
M<unQ1+wh if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+a-@
!J~: hCallWnd[index]=NULL;
xW =$j| HotKey[index]=0;
pG6-.F; HotKeyMask[index]=0;
zIFL?8!H9{ bRemoved=TRUE;
ntV>m*^ KeyCount--;
NO^t/(Z break;
J"rwWIxO* }
uN
62> }
%Z yPK,(" }
%
eRwH
> return bRemoved;
29^bMau)v }
3L?a4,Q"k} 17)M.(qmuP 5-HJ&Q DLL中的钩子函数如下:
,d>~=' 2hJ3m+N^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
, ~xU>L^ {
"}p?pF<'0 BOOL bProcessed=FALSE;
--`LP[ll if(HC_ACTION==nCode)
#\BI-zt {
o(/ia3 if((lParam&0xc0000000)==0xc0000000){// 有键松开
o$VH,2 QF switch(wParam)
>;v0zE {
zI! R-Nb case VK_MENU:
(H+[ ^(3d2 MaskBits&=~ALTBIT;
v:MS0] break;
2TEeP7 case VK_CONTROL:
K)&XQ`& MaskBits&=~CTRLBIT;
8$U ZL break;
vw]
D{OBv* case VK_SHIFT:
2bnIT>( MaskBits&=~SHIFTBIT;
X#,[2&17Fh break;
7 afA'.= default: //judge the key and send message
-Y?(Zz_w break;
KHz838C] }
dY@Tt&k8E for(int index=0;index<MAX_KEY;index++){
XhAcC if(hCallWnd[index]==NULL)
}]+}Tipd continue;
>5O y^u6Ly if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$Wzv$4; {
[KI`e SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/%9p9$kFot bProcessed=TRUE;
AdOAh y2H }
*9Js:z7I }
#4 &N0IG }
1r&
?J.z25 else if((lParam&0xc000ffff)==1){ //有键按下
C$G88hesn switch(wParam)
Q
EGanpz {
YCBML!L case VK_MENU:
rqe_zyc& MaskBits|=ALTBIT;
6XL9
qb~X break;
>ha Ixs`9 case VK_CONTROL:
zMzf=~ MaskBits|=CTRLBIT;
b%f2"e0g break;
1=5'R/k case VK_SHIFT:
zRoEx1 MaskBits|=SHIFTBIT;
x ETVtq break;
GnrW{o default: //judge the key and send message
zw0 r
i6 break;
W#7-%oT }
;:\,x for(int index=0;index<MAX_KEY;index++){
lEbR) B, if(hCallWnd[index]==NULL)
k,iV$,[TF continue;
Ox*T:5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
40d9/$uzh {
?Wz(f {Hm SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
f9XO9N,hE: bProcessed=TRUE;
:G=1$gb }
rn[}{1I33Q }
1\J1yOL }
}:l%,DBw if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
5YG@[ic for(int index=0;index<MAX_KEY;index++){
K[a< if(hCallWnd[index]==NULL)
_B7?C:8Q- continue;
YSz$` 7i if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?CW^*So SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
P}WhE //lParam的意义可看MSDN中WM_KEYDOWN部分
X`v79`g_ }
FlA\Ad;v }
l)PFzIz=V }
vua1iN1 return CallNextHookEx( hHook, nCode, wParam, lParam );
aco}pXz }
l^y?L4hg) <_{4-Q>S3# 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:
fRa-bqQ RQ)!KlY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
IfmIX+t? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
9Bvn>+_K ?]:EmP 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:
g yH7((#i sEJ;t0.LX LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
-anFt+f- {
dYew7 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
;0Ct\ [eh {
OG?j6qhpl //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
tqwk?[y}+l SaveBmp();
IJBJebqL return FALSE;
p<0kmA<B/ }
)>X|o$2 …… //其它处理及默认处理
. I&)MZ>n }
&~JfDe9IS g*r{!:,t VRQbf 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
B/9<b{6 IU'!?XVo 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
N"
Jtg@w MHr0CYyb. 二、编程步骤
XG\a-dq[ Vh.;p.!e 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
OxHw1k 6=g]Y!o$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
{cyo0-9nv d,J<SG&L& 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;
~SR(K{nf#. K0DXOVT\ 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;
E%2!C/+B >]XaUQ- 5、 添加代码,编译运行程序。
71<PEawL cH* /zNp 三、程序代码
N4` 9TN7 &(uF&-PwO4 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
o )nT #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
wp]7Lx?F #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
@F(3*5c_Y #if _MSC_VER > 1000
=y-!k)t #pragma once
9>[.= #endif // _MSC_VER > 1000
j#nO6\&o #ifndef __AFXWIN_H__
?4,*RCaI #error include 'stdafx.h' before including this file for PCH
Ubw!/|mi #endif
R!V5-0% #include "resource.h" // main symbols
U ygw*+ class CHookApp : public CWinApp
w(e+o.: {
2) /k`Na public:
.iP G /e CHookApp();
9*TS90>a // Overrides
ox\B3U%`p} // ClassWizard generated virtual function overrides
&W)+8N,L //{{AFX_VIRTUAL(CHookApp)
[;IDTo!<> public:
hDD~,/yVxs virtual BOOL InitInstance();
y5AXL5 virtual int ExitInstance();
+%le/Pg@ //}}AFX_VIRTUAL
X~)V )'R //{{AFX_MSG(CHookApp)
\A3>c| // NOTE - the ClassWizard will add and remove member functions here.
x(3
I?#kE // DO NOT EDIT what you see in these blocks of generated code !
x,w`OMQ}c //}}AFX_MSG
=FD`A#\C~ DECLARE_MESSAGE_MAP()
]g8i>,G };
gM;) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
$`XN BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
FG;<`4mY BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
B=Zukg1G BOOL InitHotkey();
j_6` s!Yw BOOL UnInit();
LE0J ;|1 #endif
k qY3r & XEUa //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
z"s%#/# #include "stdafx.h"
`GQ{*_- #include "hook.h"
w#G2-?aj #include <windowsx.h>
V7=SV:+1or #ifdef _DEBUG
[JTto!Ih$ #define new DEBUG_NEW
0vs0*;F; #undef THIS_FILE
,*,sw:=2 static char THIS_FILE[] = __FILE__;
fW0$s` #endif
c"gsB!xh #define MAX_KEY 100
"c`xH@D #define CTRLBIT 0x04
MWWu@SY #define ALTBIT 0x02
X=p"5hhfn #define SHIFTBIT 0x01
e`UQz$4! #pragma data_seg("shareddata")
`U`#I,Ln[ HHOOK hHook =NULL;
Mpx/S<Z UINT nHookCount =0;
|ek
ak{js static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
B0mLI%B static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Yx?aC!5M static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ya4?{2h@+ static int KeyCount =0;
mv
Ov<x;l static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
18!VO4u\I #pragma data_seg()
2wh#$zGy HINSTANCE hins;
@Jv# fr void VerifyWindow();
h_
!>yK BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}Zl"9A#K //{{AFX_MSG_MAP(CHookApp)
mIc:2.q^ // NOTE - the ClassWizard will add and remove mapping macros here.
Ky9W/dCR // DO NOT EDIT what you see in these blocks of generated code!
4~u9B/v //}}AFX_MSG_MAP
+g\;bLT END_MESSAGE_MAP()
.)PqN s: T)\NkM& CHookApp::CHookApp()
Lar r}o= {
12gw#J/)9h // TODO: add construction code here,
e@
oWwhpE // Place all significant initialization in InitInstance
QUP|FIpZ }
3VP $x@AV ?JqjYI{$ CHookApp theApp;
9m!7|(QV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
nxRwWj57 {
xXOw:A' BOOL bProcessed=FALSE;
7*'@qjTos if(HC_ACTION==nCode)
rWr/ p^~ {
yh!B!v' if((lParam&0xc0000000)==0xc0000000){// Key up
ks:{TA27 switch(wParam)
p {C9`wi) {
_t.FL@3e case VK_MENU:
>h7$v~nra MaskBits&=~ALTBIT;
1ih* gJPpj break;
0zV 4`y case VK_CONTROL:
"?H+
u/8$ MaskBits&=~CTRLBIT;
Ar`\ N1a break;
Ruj.J, case VK_SHIFT:
uC[d% v` MaskBits&=~SHIFTBIT;
WZ"W]Jyy{ break;
on50+)uN default: //judge the key and send message
J#@lV break;
zPBfiK_hV }
Xiju"Cup" for(int index=0;index<MAX_KEY;index++){
gb_X?j%p7 if(hCallWnd[index]==NULL)
ADBpX> continue;
41'EA\V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,9vJtP+T+! {
)*HjRTF6G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3ZN>9` bProcessed=TRUE;
hho%~^bn( }
jZ#UUnR% }
(6-y+LG }
Lh!z>IWjOG else if((lParam&0xc000ffff)==1){ //Key down
,aO@.<" switch(wParam)
y< ud('D {
msG3~@q case VK_MENU:
j0?>w{e MaskBits|=ALTBIT;
?Ccw4]YO,= break;
bX&e_Pd case VK_CONTROL:
T/Q==Q{W: MaskBits|=CTRLBIT;
"G kI5! break;
NDW8~lkL case VK_SHIFT:
Lupy:4AD MaskBits|=SHIFTBIT;
:B^mV{~
break;
`vX4!@Tw default: //judge the key and send message
z"qv break;
w`-$-4i }
6`W|V+6|7 for(int index=0;index<MAX_KEY;index++)
TU-c9"7M~ {
MA"#rOcP if(hCallWnd[index]==NULL)
eaxfn]gV continue;
fp-m.d:| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/=ACdJ {
Wx k;g SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
*#GDi'0 bProcessed=TRUE;
?&\h;11T }
U%,;N\:_ }
G{O\)gf }
MC6)=0:KX if(!bProcessed){
DUo0w f#D^ for(int index=0;index<MAX_KEY;index++){
N*':U^/t4J if(hCallWnd[index]==NULL)
wO!%
q[ continue;
>F|qb*Tm7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/pU|ZA.z'2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
jQs*(=ls }
1W0.Ufl) }
w Oj88J) }
uZ<%kV1B return CallNextHookEx( hHook, nCode, wParam, lParam );
,| <jjq) }
-[<vYxX:h: QSv^l-< BOOL InitHotkey()
lT3|D?sF {
pd7O`.3 if(hHook!=NULL){
k!9= nHookCount++;
"Ac~2<V return TRUE;
;9vIa7L& }
qkiJH T else
k_BSY=$e*D hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3Mxz_~ if(hHook!=NULL)
q>P[n z% nHookCount++;
S_j1=6#^ return (hHook!=NULL);
IY03" }
9D%qXU BOOL UnInit()
q$|0)} {
L1rAT if(nHookCount>1){
Pwg/Vhfh nHookCount--;
:+<t2^)rD return TRUE;
EZ*t$3.T }
Dl&PL BOOL unhooked = UnhookWindowsHookEx(hHook);
xg{VP7 if(unhooked==TRUE){
f~U#z7 nHookCount=0;
G~`'E&/ hHook=NULL;
U-1VnX9m }
%kJh6J return unhooked;
l$=Gvb }
prqT (1 u*U_7Uw$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
A%P 8c {
\4/:^T}* BOOL bAdded=FALSE;
"2%y~jrDN for(int index=0;index<MAX_KEY;index++){
T^d#hl.U if(hCallWnd[index]==0){
2'|XtSj hCallWnd[index]=hWnd;
|1lf(\T_ HotKey[index]=cKey;
87+.pM|t% HotKeyMask[index]=cMask;
F:M/z#:~ bAdded=TRUE;
n$IWoIdbGN KeyCount++;
tI"wVr break;
h)7v1,;w' }
$1b]xQ }
7KeXWW/ d return bAdded;
!,Qm }
^4RO ~d&'Lp[3 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
u"*J[M~ {
^M[#^wv, BOOL bRemoved=FALSE;
g%+ql[(4 for(int index=0;index<MAX_KEY;index++){
,eyp$^ 2 if(hCallWnd[index]==hWnd){
V/@[%w= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fYb KmB hCallWnd[index]=NULL;
<=$rU232} HotKey[index]=0;
sE^ns\&QP= HotKeyMask[index]=0;
=.VepX|?D bRemoved=TRUE;
7Y%!,ff KeyCount--;
3L?WTS6(u break;
H U:1f)aa }
'_k >*trV }
ful]OLV+ }
4u@yJ?U return bRemoved;
(6e!09P& }
9qnuR'BDu Tavtr9L0XY void VerifyWindow()
+GRxHuW, {
K3a>^g for(int i=0;i<MAX_KEY;i++){
L-`(!j if(hCallWnd
!=NULL){ Q-M
rH
if(!IsWindow(hCallWnd)){ ^xzE^"G6
hCallWnd=NULL; an-\k*w
HotKey=0; [t {vYo
HotKeyMask=0; _e;N'DZ
KeyCount--; O\LjtMF
} YN_X0+b3C
} x&QNP
} /;zZnF\e
} 37%`P\O;s
>|v=Ba6R0
BOOL CHookApp::InitInstance() (r.$%[,.<
{ V#p G; ,
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9"m,p
hins=AfxGetInstanceHandle(); ;%v%K+}r
InitHotkey(); 9vB9k@9
return CWinApp::InitInstance(); sx<}
tbG
} c ,Qw;
tVC@6Z$
int CHookApp::ExitInstance() ^nG1/}
{ J&
1X
VerifyWindow(); \/?
!
6~
UnInit(); sZ0g99eX
return CWinApp::ExitInstance(); L+v8E/W
} xmCm3ekmpC
$ iX^p4v
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file oc!biE`u
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) R
tXF
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .q
AQPL
#if _MSC_VER > 1000 .t"n]X i
#pragma once >l7eoj
#endif // _MSC_VER > 1000 P&qy.0
I@8+k&nXS
class CCaptureDlg : public CDialog v]LFZI5
{ fs]#/* RR
// Construction {Bav$kw;?e
public: m~Lf^gbG?
BOOL bTray; VZUZngw
BOOL bRegistered; ,\.YJD>z
BOOL RegisterHotkey(); QT7w::ht
UCHAR cKey; sV9{4T~#|
UCHAR cMask; uYG #c(lc
void DeleteIcon(); )_Z]=5Ds
void AddIcon(); BsoFQw4$9
UINT nCount; Y2RxD\!Z
void SaveBmp(); 'DaNR`9
CCaptureDlg(CWnd* pParent = NULL); // standard constructor WyKUvVi
// Dialog Data H}u)%qY+~
//{{AFX_DATA(CCaptureDlg) F?yh23&_4
enum { IDD = IDD_CAPTURE_DIALOG }; e["Z!D_H
CComboBox m_Key; GE/IaLo
BOOL m_bControl; KUl
Zk^a
BOOL m_bAlt; , V0iMq
BOOL m_bShift; C=xo&I7
CString m_Path; 8eg2o$k_,#
CString m_Number; 7)ES!C
//}}AFX_DATA O3slabE#
// ClassWizard generated virtual function overrides <8F->k1"3
//{{AFX_VIRTUAL(CCaptureDlg) 2dp*>F0L
public:
jgZX~D
virtual BOOL PreTranslateMessage(MSG* pMsg); I1eb31<
protected: hr/xpQW
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mI_ 6f~
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;ph+ZV
//}}AFX_VIRTUAL s+OvS9et_
// Implementation NKIk d
protected: 'ugR!o1
HICON m_hIcon; BP7<^`i&
// Generated message map functions yKX:Z4I/
//{{AFX_MSG(CCaptureDlg) T1g:gfw@
virtual BOOL OnInitDialog(); q\{;_?a
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !VJT"Ds_
afx_msg void OnPaint(); g/n"N>L
afx_msg HCURSOR OnQueryDragIcon(); )[^:]}%r
virtual void OnCancel(); ThT.iD[
afx_msg void OnAbout(); m%BMd
afx_msg void OnBrowse(); jS5t?0
afx_msg void OnChange(); f"}0j|Gg
//}}AFX_MSG ;I0yQlx|U
DECLARE_MESSAGE_MAP() a8lo!e9q
}; 'xu7AKpU)
#endif ul5::
A_X^k|)T
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file IArpCF/"8
#include "stdafx.h" O(c4iWm
#include "Capture.h" 6 ^6uK
#include "CaptureDlg.h" cSH tl<UY
#include <windowsx.h> B<|q{D$N/
#pragma comment(lib,"hook.lib") l1`c?Y
#ifdef _DEBUG JY;#]'T\;
#define new DEBUG_NEW ^YB\\a9
#undef THIS_FILE T^f&58{ 7
static char THIS_FILE[] = __FILE__; ] BP^.N=
#endif 2yVGEp^
#define IDM_SHELL WM_USER+1 | eVTxeq
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lN]X2 4t
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +wPvQKVfI
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *I;Mp
class CAboutDlg : public CDialog s>"WQ|;6
{ <)0LwkFtB
public: 4^jZv$l5
CAboutDlg(); plz=G}Y
// Dialog Data Z)Xq!]~/g
//{{AFX_DATA(CAboutDlg) <T=o]M$
enum { IDD = IDD_ABOUTBOX }; sVZ}nq{
//}}AFX_DATA
# 8-P
// ClassWizard generated virtual function overrides \C'I l
w
//{{AFX_VIRTUAL(CAboutDlg) 16d{IGMz
protected: JqH.QnKcv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u0$5Fd&X
//}}AFX_VIRTUAL 7u&H*e7
// Implementation a7 '\*
protected: =fu_ Jau}
//{{AFX_MSG(CAboutDlg) 0 ^-b}
//}}AFX_MSG iaq:5||,
DECLARE_MESSAGE_MAP() Ug[F3J|Mu
}; p_kTLNZd9
9BgQoK@
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rqG6Ll`=+
{ r0XGGLFuZl
//{{AFX_DATA_INIT(CAboutDlg) ROI$;B(
//}}AFX_DATA_INIT Snvj9Nr
} `:^)"#z)
X#\P.$
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 0^tJX1L
{ I?xhak1)lu
CDialog::DoDataExchange(pDX); ^LAS9K1.
//{{AFX_DATA_MAP(CAboutDlg) &opH\wa
//}}AFX_DATA_MAP Yh!\:9@(
} ;-P:$zw9c
&b#NF1Q.
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i~M.F=I5
//{{AFX_MSG_MAP(CAboutDlg) {UjIxV(J
// No message handlers N'1 [t
//}}AFX_MSG_MAP ,'@ISCK^
END_MESSAGE_MAP() ZBh@%A
'XjHB!!hU
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %>QSeX
: CDialog(CCaptureDlg::IDD, pParent) ]`+"o[
{ A UO0
//{{AFX_DATA_INIT(CCaptureDlg) Xwn|.
m_bControl = FALSE; ^SES')x
m_bAlt = FALSE; vN[m5)aT
m_bShift = FALSE; @x\gk5
m_Path = _T("c:\\"); #
v/aI*Rl
m_Number = _T("0 picture captured."); b9!J}hto,
nCount=0; #p^pvdvh3
bRegistered=FALSE; U*#E aL
bTray=FALSE; A 5\"e^>
//}}AFX_DATA_INIT L?pvz}
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gcY~_'&u
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <GU(/S!}
} i2 Iu2
sZ(Q4)r
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?_`P;}4#
{ n ;fTx
CDialog::DoDataExchange(pDX); .M#>@~XR
//{{AFX_DATA_MAP(CCaptureDlg) Ymh2qGcj]8
DDX_Control(pDX, IDC_KEY, m_Key); UHm+5%ZC
DDX_Check(pDX, IDC_CONTROL, m_bControl); LB 5EGw
DDX_Check(pDX, IDC_ALT, m_bAlt); CpJXLc3_d5
DDX_Check(pDX, IDC_SHIFT, m_bShift); ny;)+v?mN\
DDX_Text(pDX, IDC_PATH, m_Path); ;jfXU_K
DDX_Text(pDX, IDC_NUMBER, m_Number); oI"Fpo
//}}AFX_DATA_MAP SX<>6vH&
} 0DjBqh$
*xX0]{49q
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X([n>w
//{{AFX_MSG_MAP(CCaptureDlg) a}8>(jtSt
ON_WM_SYSCOMMAND() n@8{FoF
ON_WM_PAINT() qv >(
ON_WM_QUERYDRAGICON() !!Gi.VL
ON_BN_CLICKED(ID_ABOUT, OnAbout) {d5ur@G1
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) AHg4kG
ON_BN_CLICKED(ID_CHANGE, OnChange) ?@7|Q/
//}}AFX_MSG_MAP ErUk>V
END_MESSAGE_MAP() .*..pf|/
?J1&,'&
BOOL CCaptureDlg::OnInitDialog() RAJ|#I1
{ [aVJYr2
CDialog::OnInitDialog(); 8YkH
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T%xL=STJNy
ASSERT(IDM_ABOUTBOX < 0xF000); #SOj4W
CMenu* pSysMenu = GetSystemMenu(FALSE); bSKV|z/x
if (pSysMenu != NULL) M;@03 x W
{ <.]& FPJ
CString strAboutMenu; GoGgw]h>x
strAboutMenu.LoadString(IDS_ABOUTBOX); N1zrfn-VU
if (!strAboutMenu.IsEmpty()) LWR&(p.%
{ [IX!3I[J]
pSysMenu->AppendMenu(MF_SEPARATOR); {ca^yHgGy
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o".O#^3H%
} Q#AHEm{9;s
} M(gWd8?#
SetIcon(m_hIcon, TRUE); // Set big icon )Syf5I
SetIcon(m_hIcon, FALSE); // Set small icon G\+MT(&5
m_Key.SetCurSel(0); [1X5r<(W5
RegisterHotkey(); Cl){sP=8W
CMenu* pMenu=GetSystemMenu(FALSE); U0=zuRr n
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 246!\zf
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Hm[!R:HW,S
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3^Q U4
return TRUE; // return TRUE unless you set the focus to a control 1T^L) %&p_
} " ~hj B
H s 3*OhK\
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ed2&9E>9b
{ n ]g,)m
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^qy-el
{ _A~gqOe
CAboutDlg dlgAbout; E^ti!4{<
dlgAbout.DoModal(); SQ.Wj?W)
} Dy'l]vN$
else qt;Tfuo
{ >
,L'A;c}
CDialog::OnSysCommand(nID, lParam); ^*7~ Wxk5
} 32_{nLV$[
} .xtjB8gc
stnyJ9
void CCaptureDlg::OnPaint() O*3x'I*a
{ LEM{$Fxo&
if (IsIconic()) Mis t,H7
{ )oO cV%
CPaintDC dc(this); // device context for painting 8ALvP}H
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 0B(<I?a/
// Center icon in client rectangle myT z
int cxIcon = GetSystemMetrics(SM_CXICON); 0dKI+zgr
int cyIcon = GetSystemMetrics(SM_CYICON); kl.)A-6V
CRect rect; _=c>>X
GetClientRect(&rect); $9znRTFEj
int x = (rect.Width() - cxIcon + 1) / 2; @l9qH1
int y = (rect.Height() - cyIcon + 1) / 2; t#+X*'/
// Draw the icon cH>rS\|Y
dc.DrawIcon(x, y, m_hIcon); ; 6Wlu3I
} W11Wv&
else 9I>+Q&
{ QMI&?Q:=
CDialog::OnPaint(); Lm<"W_
} T`g.K6$b
} 7<Fp3N 3
_A*5BAB:h(
HCURSOR CCaptureDlg::OnQueryDragIcon() _S:6;_bz
{ `BKo`@
return (HCURSOR) m_hIcon; W G2 E3y
} xq:.|{HUk
Hz$l)g}U
void CCaptureDlg::OnCancel() \14"B gj1
{ \F%5TRoC
if(bTray) iw<#V&([J
DeleteIcon(); Wvl>i HB
CDialog::OnCancel(); OYGh!sW
} (yFR;5Fo
#n^P[Zw
void CCaptureDlg::OnAbout() :.!]+#Me
{ qr%9Sdvx
CAboutDlg dlg; C Ih@H6|
dlg.DoModal();
~YHy'.
} Ghgx8 ]e
!3>(fj+QS
void CCaptureDlg::OnBrowse() !oeu
{ 4 vwa/?
CString str; >{i/LC^S
BROWSEINFO bi; xwa5dtcng
char name[MAX_PATH]; )/H=m7}1h
ZeroMemory(&bi,sizeof(BROWSEINFO)); mLU4R Q}5
bi.hwndOwner=GetSafeHwnd(); <va3L y)c&
bi.pszDisplayName=name; I0 a,mO;m
bi.lpszTitle="Select folder"; >N>WOLbb7(
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9l2,:EQ*
LPITEMIDLIST idl=SHBrowseForFolder(&bi); &^e%gU8!\
if(idl==NULL) #%k!`?^fbK
return; _aVrQ@9
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I|lz;i}$
str.ReleaseBuffer(); Uw^`_\si
m_Path=str; Zrp`91&I
if(str.GetAt(str.GetLength()-1)!='\\') Z]l<,m
m_Path+="\\"; Tl=cniy]
UpdateData(FALSE); &~U!X~PpB
} T^u ][I3*
W R@=[G#TJ
void CCaptureDlg::SaveBmp() h5WS<P
{ *@fR36
CDC dc; FX7=81**4
dc.CreateDC("DISPLAY",NULL,NULL,NULL); z]ZhvH7-
CBitmap bm; vlth\[
int Width=GetSystemMetrics(SM_CXSCREEN); x\r7q
int Height=GetSystemMetrics(SM_CYSCREEN); XnrOC|P$
bm.CreateCompatibleBitmap(&dc,Width,Height); D/jB.
CDC tdc; G?!b00H
tdc.CreateCompatibleDC(&dc); `HvU_ja;
CBitmap*pOld=tdc.SelectObject(&bm); c%v[p8
%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %pgie"k
tdc.SelectObject(pOld); tLe!_p)
BITMAP btm; jM5w<T-2/
bm.GetBitmap(&btm); 4m"6$
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3`+Bq+
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);
<_>xkQbn2
BITMAPINFOHEADER bih; <_ruVy0]
bih.biBitCount=btm.bmBitsPixel; {^*K@c
bih.biClrImportant=0; 6+LBs.vl}
bih.biClrUsed=0; E'iN==p_:
bih.biCompression=0; m/bP`-/,
bih.biHeight=btm.bmHeight; I(Gl8F\c~
bih.biPlanes=1; Y2d(HD@
bih.biSize=sizeof(BITMAPINFOHEADER); m4_ZGjmJM
bih.biSizeImage=size; sg9
bih.biWidth=btm.bmWidth; z~($
"
bih.biXPelsPerMeter=0; IY40d^x
bih.biYPelsPerMeter=0; ~m6b6Aj@6
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ttd
^jT
static int filecount=0; aESlbH
CString name; 1a]QNl_x
name.Format("pict%04d.bmp",filecount++); UNF@%O4_T
name=m_Path+name; DcRvZH
BITMAPFILEHEADER bfh; E5QQI9ea
bfh.bfReserved1=bfh.bfReserved2=0; ZGsI\3S
bfh.bfType=((WORD)('M'<< 8)|'B'); zXZXp~7)
bfh.bfSize=54+size; ~kp,;!^vr
bfh.bfOffBits=54;
i38`2
CFile bf; +[B@83
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ :x[SV^fw[
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ep)O|_=
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `_+%
bf.WriteHuge(lpData,size); pQCocy
bf.Close(); PR3&LI;B*
nCount++; OVUJiBp
} nw,XA0M3
GlobalFreePtr(lpData); k{C03=xk
if(nCount==1) zFm:=,9
m_Number.Format("%d picture captured.",nCount); " 7g\X$
else Csf!I@}Z
m_Number.Format("%d pictures captured.",nCount); _~.S~;o!b
UpdateData(FALSE); ]Ei*I}
} K:q|M?_
Y|nC_7&Bv
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) r?2J
{ `
#; "
if(pMsg -> message == WM_KEYDOWN) &j?+%Y1n@
{ S~hoAl"xb/
if(pMsg -> wParam == VK_ESCAPE) i5#4@ 4aC
return TRUE; MG:eI?G/'
if(pMsg -> wParam == VK_RETURN) sH51 .JG
return TRUE; jT*?Z:U
} 7-VP)|L#G
return CDialog::PreTranslateMessage(pMsg); *X\J[$!
} :6jh*,OHZl
1!W'0LPM
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nduUuCIY.
{ ZtGtJV"H
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Vb,'VN%
SaveBmp(); x(7Q5Uk\
return FALSE; td 5!
S]
} !,9;AMO
-
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ")Qhg-l
CMenu pop; ;5tQV%V^Q
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (>C$8)v
CMenu*pMenu=pop.GetSubMenu(0); N
oRPvFv
pMenu->SetDefaultItem(ID_EXITICON); {F ',e~}s
CPoint pt; #CRd@k?
GetCursorPos(&pt); s<{) X$
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); V/]o':
if(id==ID_EXITICON) &3f^]n!@
DeleteIcon(); .&2~gA
else if(id==ID_EXIT) M
\UB
r4
OnCancel(); o&MOcy D
return FALSE; opgNt o6$
} @tlWyUju
LRESULT res= CDialog::WindowProc(message, wParam, lParam); B^@X1EE
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 3c+ps;nh
AddIcon(); Ya;y@44
return res; IG90mpLX
} 9`td_qh
-"6Z@8=
void CCaptureDlg::AddIcon() ^@f.~4P*I
{ heScIe
N^`
NOTIFYICONDATA data; s)G?5Gz
data.cbSize=sizeof(NOTIFYICONDATA); 1#KBf[0
CString tip; nL+y"O
tip.LoadString(IDS_ICONTIP); 6z2%/P-'
data.hIcon=GetIcon(0); g\1|<jb3
data.hWnd=GetSafeHwnd(); .u:aX$t+
strcpy(data.szTip,tip); :6J&%n
data.uCallbackMessage=IDM_SHELL; R(f6uO!m
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @?*;
-]#)
data.uID=98; ^$s&bH'8
Shell_NotifyIcon(NIM_ADD,&data); O>d
[;Q
ShowWindow(SW_HIDE); sAS[wcOQ
bTray=TRUE; o>HU4O}
} \V
T.bUs
hA1p#
void CCaptureDlg::DeleteIcon() L&0aS:
{ Z8`Y}#Za [
NOTIFYICONDATA data; v8K`cijSS
data.cbSize=sizeof(NOTIFYICONDATA); .Bojb~zt
data.hWnd=GetSafeHwnd(); 1 %8JMq\
data.uID=98; QzxEkTc;
Shell_NotifyIcon(NIM_DELETE,&data); ?2,{+d |
ShowWindow(SW_SHOW); &qP0-x)
SetForegroundWindow(); bnZ H
ShowWindow(SW_SHOWNORMAL); nP_)PDTFp
bTray=FALSE; ART0o7B
} A<+1:@0
!oYNJE Y7
void CCaptureDlg::OnChange() 9XhcA
{ 3)y=}jw
RegisterHotkey(); 06z+xxCo
} aSMoee@!
LfN,aW
BOOL CCaptureDlg::RegisterHotkey() VniU:A
{ kK:U+`+
UpdateData(); e~geBlLar
UCHAR mask=0; j/;wxKW
UCHAR key=0; ]f>0P3O5&
if(m_bControl) pKU(4&BxX
mask|=4; fr`Q
5!0
if(m_bAlt) gv){&=9/
mask|=2; _'l"Dk
if(m_bShift) Ol;DJV
mask|=1; (4|R}jv
key=Key_Table[m_Key.GetCurSel()]; n`V? n
if(bRegistered){ 3vdFO: j
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4v`G/w
bRegistered=FALSE; _*Ej3=u
} e*Y<m\*
cMask=mask; ^!z(IE'
cKey=key; MT6"b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -Jt36|O
return bRegistered; >[;L.
} 8erG](
+J#8wh
四、小结 5fRr d;
B$qTH5)W
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。