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:
l :e&w(1H
_$g2;X > 一、实现方法
_"b[UT}m 2pKkg>/S 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:
/I`AwCx M0+xl+c+ #pragma data_seg("shareddata")
(n4\$LdP- HHOOK hHook =NULL; //钩子句柄
P2U^%_~ UINT nHookCount =0; //挂接的程序数目
q5@N//<DNN static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
fV b~j ; static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
{5%u G2g static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
S.u1[Yz^ static int KeyCount =0;
+v!%z( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
uq.!{3)8 #pragma data_seg()
UDBMf2F] c#-o@`Po 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。
sbeS9vE
F(!9;O5J] 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:
2=\} 0 MmI[: BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
O,a1?_m8 cKey,UCHAR cMask)
?pBQaUl& {
9oe=*#Ig1m BOOL bAdded=FALSE;
tsYBZaH for(int index=0;index<MAX_KEY;index++){
\
5&-U@ if(hCallWnd[index]==0){
VxgP^* hCallWnd[index]=hWnd;
]AB<OjF1c| HotKey[index]=cKey;
^~
95q0hq: HotKeyMask[index]=cMask;
3PLYC}Jq bAdded=TRUE;
W(gOidKKz KeyCount++;
5$58z break;
]!um}8!} }
tL>c@w#Pv }
S)?V;@p6 return bAdded;
D1ep7ykY }
rpB0?h!$ //删除热键
k_o$ Ci BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
AGWs> {
=._V$:a6o BOOL bRemoved=FALSE;
4#^E$N: for(int index=0;index<MAX_KEY;index++){
HQy:,_f@ if(hCallWnd[index]==hWnd){
h /iL/Q= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
^t2b`n60 hCallWnd[index]=NULL;
{V7W!0;! HotKey[index]=0;
&1 BACKu HotKeyMask[index]=0;
#CV;Np bRemoved=TRUE;
iaV%* KeyCount--;
K Y=$RO break;
es6]c%o:t^ }
oAxRI+&|. }
(zmLMG(R }
G`oY(2U return bRemoved;
Q?g#?z&Pu\ }
>d9b"T @'>Ul!.] 6)h~9iK DLL中的钩子函数如下:
{0o,2]o!: gb^<6BYUG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
\z8j6 h {
Gf->N
`N BOOL bProcessed=FALSE;
nK8IW3fX9) if(HC_ACTION==nCode)
2Kmnt(> {
k^{}p8;3 if((lParam&0xc0000000)==0xc0000000){// 有键松开
Nf^6t1se switch(wParam)
h`@z61UI {
U&'Xsz case VK_MENU:
8=-/0y9, MaskBits&=~ALTBIT;
W%-` break;
;uhpo case VK_CONTROL:
B;A< pNT MaskBits&=~CTRLBIT;
NtDxwzj break;
:5-t$^R case VK_SHIFT:
MFtC2* MaskBits&=~SHIFTBIT;
*v:o`{vM[ break;
:m[HUh default: //judge the key and send message
!<UdG+iV break;
*G"}m/j- }
AT- for(int index=0;index<MAX_KEY;index++){
XE`u if(hCallWnd[index]==NULL)
VD90JU]X< continue;
'h#>@v> } if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
nhLw&V3y {
\GdsQAF" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
n48%Uwa, bProcessed=TRUE;
,KaO8^PB }
U}<' [o
V }
9!,f4&G` }
iTVepYv4m else if((lParam&0xc000ffff)==1){ //有键按下
c9ea%7o{0a switch(wParam)
rebWXz7 {
q!as~{! case VK_MENU:
lbj_if; MaskBits|=ALTBIT;
hr?0RPp} break;
jyFKO[s\X case VK_CONTROL:
GDwijZw MaskBits|=CTRLBIT;
2&0#'Tb break;
_}l7f case VK_SHIFT:
Z!z#+G MaskBits|=SHIFTBIT;
D"<>!]@(a break;
v9GfudTZR default: //judge the key and send message
/&o<kY break;
T1A/>\Ns }
O6b.oS'- for(int index=0;index<MAX_KEY;index++){
uC5W1LyI if(hCallWnd[index]==NULL)
)rbcY0q continue;
jP )VTk_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
. sv
uXB {
P] Xl SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8.tp#x,A bProcessed=TRUE;
D%h_V>#z }
J8@7
5p9 }
)
B[S4K2 }
#OsUF,NU if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Ze3sc$fG2 for(int index=0;index<MAX_KEY;index++){
BUU ) Sz if(hCallWnd[index]==NULL)
Vb/XT{T;b continue;
<*+Y]= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
x-HR [{C SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
uE&2M>2 //lParam的意义可看MSDN中WM_KEYDOWN部分
?#J;[y\^ }
wyUfmk_} }
N3|aNQ=X0 }
VR vX^w0 return CallNextHookEx( hHook, nCode, wParam, lParam );
7s2e>6Q[ }
Ya
~lPc l/6(V: 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
zF_aJ+i:~ iYl{V']A BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
? W2Wy\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
E)%r}4u> QUi=ZD1 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
7=@MnF` W4rh7e4 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
cQ`+ A|q {
F1b~S;lm if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
(!dwUB {
jrm
L>0NZ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
ZN-5W|' O SaveBmp();
V1\x.0Fs return FALSE;
~w}Zv0 }
1/vcj~|)t …… //其它处理及默认处理
XFcIBWS }
Fhbp,CX4p : t6.J few=`%/ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
hxj[gE'R( N0']t Gh2 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
rR3(yy0L YLe$Vv735 二、编程步骤
a?ii)GGq ]5hGSl2 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";
2F fwct: 6j=a 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
N!#TK9 bhc
.UmH 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;
Jz'8|o;^ a>/jW-? 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;
Q.`O;D}x A]CO
Ysc 5、 添加代码,编译运行程序。
nLv"ON~ bx8|_K*^ 三、程序代码
VS_xC$X!S ziBg' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
"N4rh<< #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
z4[S02s #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
D_4UM#Tw #if _MSC_VER > 1000
Q)b*;
@ #pragma once
Xv1mjHZCC #endif // _MSC_VER > 1000
*Mr?}_,X* #ifndef __AFXWIN_H__
1%,AU #error include 'stdafx.h' before including this file for PCH
f MDM\&f #endif
=;"$t_t #include "resource.h" // main symbols
M,nLPHgK class CHookApp : public CWinApp
{=GWQn6cc {
m?=9j~F* public:
60u}iiC@ CHookApp();
D/=
AU // Overrides
`&-)(# // ClassWizard generated virtual function overrides
:~1p //{{AFX_VIRTUAL(CHookApp)
#`9D,+2iB% public:
-8r9DS-/W virtual BOOL InitInstance();
C/L+:b&x~ virtual int ExitInstance();
gAWrn^2L5 //}}AFX_VIRTUAL
y8.(filNB //{{AFX_MSG(CHookApp)
E6NrBPm // NOTE - the ClassWizard will add and remove member functions here.
NFQR // DO NOT EDIT what you see in these blocks of generated code !
q:D!@+U //}}AFX_MSG
,`lVB#| DECLARE_MESSAGE_MAP()
`*nK@: };
k TLA["<m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
8 O5@FU
3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>^Zyls BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
i+z;tF` BOOL InitHotkey();
=<M7t*! BOOL UnInit();
)FG<|G( #endif
=5-|H;da n^7$ST#'bV //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
K&WNtk3hT #include "stdafx.h"
?/,sKF74i #include "hook.h"
;|e6Qc9 #include <windowsx.h>
>
CPJp!u #ifdef _DEBUG
+'NiuN #define new DEBUG_NEW
_\P9~w
` #undef THIS_FILE
8'(|1 static char THIS_FILE[] = __FILE__;
|# zznT" #endif
ktr l | #define MAX_KEY 100
-v9V/LJ #define CTRLBIT 0x04
Kfc(GL? #define ALTBIT 0x02
dG|srgk+ #define SHIFTBIT 0x01
lqOv_q #pragma data_seg("shareddata")
q_8qowu" HHOOK hHook =NULL;
K<b -|t9f UINT nHookCount =0;
z(^p@&r)F static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
B @]( , static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
SvH=P!`+ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
EIl _QV6 static int KeyCount =0;
1$fA9u$ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
kImGSIJ #pragma data_seg()
6^zuRY; HINSTANCE hins;
Nuk\8C void VerifyWindow();
r]'AdJFt BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
uH]n/Kv1, //{{AFX_MSG_MAP(CHookApp)
@4_CR // NOTE - the ClassWizard will add and remove mapping macros here.
~K^Z4 // DO NOT EDIT what you see in these blocks of generated code!
G%anot //}}AFX_MSG_MAP
L[+65ce%* END_MESSAGE_MAP()
KoQvC=+WI !.iA^D//] CHookApp::CHookApp()
Y(/VW&K&: {
XH)MBr@Fz // TODO: add construction code here,
-4b9( // Place all significant initialization in InitInstance
p`{9kH1m e }
A1\;6W: &&[j/d}J CHookApp theApp;
dvsOJj/b LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
sl%B-;@I {
f&^K>Jt1@# BOOL bProcessed=FALSE;
bM8b3,}?n if(HC_ACTION==nCode)
H"I|dK : {
a&ZH if((lParam&0xc0000000)==0xc0000000){// Key up
bQ0m=BzF switch(wParam)
blaxUP: {
y{K~g<VL case VK_MENU:
rM pb MaskBits&=~ALTBIT;
vyqlP;K break;
(q*T. case VK_CONTROL:
Lc*i[J<s MaskBits&=~CTRLBIT;
Cb.~Dv
! break;
@<},- u case VK_SHIFT:
Z\i@Qa +r MaskBits&=~SHIFTBIT;
yBauK-7*c break;
jbC7U9t7 default: //judge the key and send message
62%.ddM4 break;
lpve Yz }
r6 ,5&`& for(int index=0;index<MAX_KEY;index++){
2={`g/WeE if(hCallWnd[index]==NULL)
QS_"fsyN: continue;
L4}C%c\p* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
y| @[?B {
"z< =S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
uGc}^a2 bProcessed=TRUE;
B4[onYU }
+Medu?K
` }
\|DcWH1 }
hXbb+j else if((lParam&0xc000ffff)==1){ //Key down
(Pc:A!} switch(wParam)
~+QfP:G {
'(&.[Pk:" case VK_MENU:
gHvxmIG MaskBits|=ALTBIT;
?8b?{`@V break;
}LDDm/$^} case VK_CONTROL:
gAgzM?A1( MaskBits|=CTRLBIT;
h+CTi6-p break;
W84JB3p case VK_SHIFT:
ui YZk3 MaskBits|=SHIFTBIT;
*hAq]VC}) break;
5R/k -h^` default: //judge the key and send message
~F+{P4%`< break;
f77Jn^Dt }
9'\18_w for(int index=0;index<MAX_KEY;index++)
,~JxYh {
pDCQ?VW if(hCallWnd[index]==NULL)
p_)V@7 continue;
(Pbdwzao if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6i(nyA
2! {
%W+*)u72( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
j1Q G-Rs& bProcessed=TRUE;
E
Rqr0>x }
2"c$#N }
+0;6.PK }
I|n<B"Q6^ if(!bProcessed){
\=XAl >}\ for(int index=0;index<MAX_KEY;index++){
Tc T%[h! if(hCallWnd[index]==NULL)
:hwZz2Dhi continue;
b{b2L. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Siq2Glg_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
tl
(2=\ }
@F+4
NL-'P }
QDF1$,s4i }
Og Y4J|< return CallNextHookEx( hHook, nCode, wParam, lParam );
^j0Mu.+_ }
:0Rd )*k,v 8G6PcTqv" BOOL InitHotkey()
FL,jlE_ {
"<Dn%r if(hHook!=NULL){
]Vln5U
nHookCount++;
G{pfyfF return TRUE;
N)RyRR.x1. }
{W)Kz_ else
\A6MVMF8 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
N&]v\MjI62 if(hHook!=NULL)
%FDi7Rx nHookCount++;
+\fr3@Yc return (hHook!=NULL);
^&03D5@LoY }
C\ZL*,%} BOOL UnInit()
GLp2
?fon {
rr>QG<i;G if(nHookCount>1){
jr|(K*; nHookCount--;
w4Qqo( return TRUE;
3{LXx }
'_lyoVP BOOL unhooked = UnhookWindowsHookEx(hHook);
2E33m*C2 if(unhooked==TRUE){
&=Gz[1
L nHookCount=0;
#v0"hFOH, hHook=NULL;
CC0@RU }
gPSUxE`O. return unhooked;
gbsRf&4h }
%0fF_OU 6}='/d-[ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Nwr.mtvh {
5+vCuVZ BOOL bAdded=FALSE;
}fpK{db for(int index=0;index<MAX_KEY;index++){
an_qE}P if(hCallWnd[index]==0){
*Z>Yv37P hCallWnd[index]=hWnd;
Q&]
}`Rp= HotKey[index]=cKey;
r(y1^S9!8 HotKeyMask[index]=cMask;
,d(F|5M: bAdded=TRUE;
D9zw' RY KeyCount++;
C)~YWx@v break;
9uV/G7Geq }
F1JSf&8 }
a*REx_gLG return bAdded;
QWH1xId }
o,[~7N 8Y *SZTzV BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
S(9Xbw)T {
Rp
`JF}~o BOOL bRemoved=FALSE;
fu?5gzT+b for(int index=0;index<MAX_KEY;index++){
i>HipD,TD if(hCallWnd[index]==hWnd){
)X@Obg if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
7Fw`s@/% hCallWnd[index]=NULL;
_P
0,UgZz HotKey[index]=0;
<h^'x7PkW5 HotKeyMask[index]=0;
CP_ ?DyWU bRemoved=TRUE;
^"7tfo8 KeyCount--;
%lNv?sWb break;
gYVk5d|8@4 }
T=35? }
0L"CM?C }
e:hkWcV return bRemoved;
4 d4le }
A`Q'I$fj mA}-hR% void VerifyWindow()
#u~s,F$De {
-FytkM^]6 for(int i=0;i<MAX_KEY;i++){
MzT#1~ if(hCallWnd
!=NULL){ >8Wvz.Nq/
if(!IsWindow(hCallWnd)){ *(YtO
hCallWnd=NULL; pW7vY)hj
HotKey=0; C`+g:qT
HotKeyMask=0; IG0$OtG
KeyCount--; 5%"${ywI
} +]uW|owxo
} c|3%0=,`
} _/ bF t6
} ]vJZ v"ACn
0Ge*\Q
BOOL CHookApp::InitInstance() $T{,3;kt
{ .w/#S-at
AFX_MANAGE_STATE(AfxGetStaticModuleState()); QW#]i
hins=AfxGetInstanceHandle(); 9;2PoW8
InitHotkey(); Ou</{l/
return CWinApp::InitInstance(); y
,isK
} h=SQ]nV{
J~KWn.
int CHookApp::ExitInstance() I"Y d6M%
;
{ ;8/w'oe*j
VerifyWindow(); GHj1G,L@\
UnInit(); o6sL~*hQ
return CWinApp::ExitInstance(); ?g%5 d
} n={}='
jcHs!
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H`q" _p:
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }qmBn`3R
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ W)JUMW2|
#if _MSC_VER > 1000 rB;`&)-
#pragma once B 3|zR
#endif // _MSC_VER > 1000 'EU{%\qM
kv&%$cA
class CCaptureDlg : public CDialog JPfNf3<@My
{ Ze~$by|9f
// Construction D}'g4Ag
public: ! utgo/n
BOOL bTray; <_@ K4zV
BOOL bRegistered; zy`4]w$Lj+
BOOL RegisterHotkey(); { 6Lkh
UCHAR cKey; bcL>S$B
UCHAR cMask; / U1VE|T
void DeleteIcon(); ~K% ]9
void AddIcon(); 9UTWq7KJ
UINT nCount; iz]Vb{5n%
void SaveBmp(); {`QF(WL
CCaptureDlg(CWnd* pParent = NULL); // standard constructor *bRer[7y
// Dialog Data vR`-iRQ?_
//{{AFX_DATA(CCaptureDlg) W!q'wrIx(
enum { IDD = IDD_CAPTURE_DIALOG }; h h}%Z=
CComboBox m_Key; QT{$2 7;
BOOL m_bControl; ya5a7
BOOL m_bAlt; $_ub.g|
BOOL m_bShift; HVz-i{M
CString m_Path; EquNg@25W
CString m_Number; 4 q}1
//}}AFX_DATA ^(m`5]qr7J
// ClassWizard generated virtual function overrides f/Km$#xOr
//{{AFX_VIRTUAL(CCaptureDlg) @z"Zj 3ti
public: wpu]{~Y
virtual BOOL PreTranslateMessage(MSG* pMsg); 9(lIz{
protected: Gp9>R~$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pC(AM=RY!
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }`6-^lj
//}}AFX_VIRTUAL *E0+!
// Implementation :Q2\3
protected: }Bw=2 ~
HICON m_hIcon; d=WC1"
// Generated message map functions 6CO>Tg:%
//{{AFX_MSG(CCaptureDlg) 6yk
virtual BOOL OnInitDialog(); q_>DX,A
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &<@{ d
afx_msg void OnPaint(); toPA@V
afx_msg HCURSOR OnQueryDragIcon(); ?"+'OOqik
virtual void OnCancel(); B)
&BqZ&
afx_msg void OnAbout(); @dX0gHU[c
afx_msg void OnBrowse(); F`8A!|cIy
afx_msg void OnChange(); *7oPM5J|v
//}}AFX_MSG 0K>rc1dy
DECLARE_MESSAGE_MAP() RL~|Kr<7J
}; LW_Y
#endif ~]Mq'
~cSC-|$^&
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file COv#dOw
#include "stdafx.h" 1w+OnJI?
#include "Capture.h" :d/Z&LXD
#include "CaptureDlg.h" ']$ttfJB
#include <windowsx.h>
&k\7fvF
#pragma comment(lib,"hook.lib") m#,
F%s
#ifdef _DEBUG \ ^EjE
#define new DEBUG_NEW y[qW>
#undef THIS_FILE gv `jeN
static char THIS_FILE[] = __FILE__; X X{:$f+
#endif yHQ.EZ~%
#define IDM_SHELL WM_USER+1 )ty
*_@N0
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E1 *\)q
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gtJ^8khME
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @l"GfDfL9
class CAboutDlg : public CDialog *bn9j>|iv
{ y>2v 9;Qp
public: w|Zq5|[
CAboutDlg(); QC4_\V>[
// Dialog Data #Vul#JHW
//{{AFX_DATA(CAboutDlg) ""Drf=]
enum { IDD = IDD_ABOUTBOX }; j /-p3#c
//}}AFX_DATA /qI80KVnN
// ClassWizard generated virtual function overrides (4ow0}1
//{{AFX_VIRTUAL(CAboutDlg) QI=SR
protected: 1{o
CMq/v
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XIBw&mWf
//}}AFX_VIRTUAL P_-zkw
// Implementation g?j"d{.9t
protected: ct~lt'L\
//{{AFX_MSG(CAboutDlg) 5`x9+XvoN
//}}AFX_MSG DLS-WL
DECLARE_MESSAGE_MAP() b4%IyJr
}; D:n0dfPU
42z9N\ f
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
C&e
{ MM'<uy
//{{AFX_DATA_INIT(CAboutDlg) /f%u_ 8pV%
//}}AFX_DATA_INIT CdZ;ZR
} y9s5{\H
/cI]Z^&
void CAboutDlg::DoDataExchange(CDataExchange* pDX) B|, 6m 3.
{ YRYrR|I
CDialog::DoDataExchange(pDX); DJn>. Gd
//{{AFX_DATA_MAP(CAboutDlg) e#zGLxa
//}}AFX_DATA_MAP (|6qN
} P@5^`b|
W_DO8nX
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) fi?[ e?|c@
//{{AFX_MSG_MAP(CAboutDlg) \C<rg|
// No message handlers TTOd0a
//}}AFX_MSG_MAP T.1z<l""
END_MESSAGE_MAP() 4h~Oj
y16&
iww h,(
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) oOUVU}H
: CDialog(CCaptureDlg::IDD, pParent) "M:arP5f
{ Gf%o|kX]
//{{AFX_DATA_INIT(CCaptureDlg) S3J6P2P
m_bControl = FALSE; Vy/g;ZPU1
m_bAlt = FALSE; NA3yd^sr
m_bShift = FALSE; \JyWKET::_
m_Path = _T("c:\\"); $PTedJ}*Y
m_Number = _T("0 picture captured."); F)%; gzs
nCount=0; =Q|}7g8o
bRegistered=FALSE; Maxnk3n
bTray=FALSE; !^LvNW\|
//}}AFX_DATA_INIT Y3Qq'FN!I
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Tbwq_3fK
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4p-$5Fk8}
} 8n73MF
pGcc6q1
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Zq`bd55~
{ \hq8/6=4s
CDialog::DoDataExchange(pDX); +(/Z=4;,[
//{{AFX_DATA_MAP(CCaptureDlg) Y7jD:P
DDX_Control(pDX, IDC_KEY, m_Key); 21WqLgT3 4
DDX_Check(pDX, IDC_CONTROL, m_bControl); qB=pp!zQ
DDX_Check(pDX, IDC_ALT, m_bAlt); [n}c}%
DDX_Check(pDX, IDC_SHIFT, m_bShift); cPN7^*
DDX_Text(pDX, IDC_PATH, m_Path); D!<$uAT
DDX_Text(pDX, IDC_NUMBER, m_Number); Pw7'6W1
//}}AFX_DATA_MAP ~::R+Lh(
} HaC3y[ LJ0
\LYQZ*F
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) cp2fDn
//{{AFX_MSG_MAP(CCaptureDlg) ~d%Q1F*,=
ON_WM_SYSCOMMAND() *.+>ur?t
ON_WM_PAINT() p/5!a~1'xN
ON_WM_QUERYDRAGICON() HcVPJuD
ON_BN_CLICKED(ID_ABOUT, OnAbout) yd%\3}-
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^GAdl}
ON_BN_CLICKED(ID_CHANGE, OnChange) !'gz&3B~h
//}}AFX_MSG_MAP Q* 4q3B&
END_MESSAGE_MAP() lcP@5ZW
."^dJ |fN
BOOL CCaptureDlg::OnInitDialog() YH[_0!JY^
{ !Q3Snu=
CDialog::OnInitDialog(); 7E5Dz7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xWwPrd
ASSERT(IDM_ABOUTBOX < 0xF000); p%ZiTrA1&D
CMenu* pSysMenu = GetSystemMenu(FALSE); nSow$6T_
if (pSysMenu != NULL) iR_Syk`G*A
{ O1ha'@qID
CString strAboutMenu; pkU e|V
strAboutMenu.LoadString(IDS_ABOUTBOX); 1;xw)65
if (!strAboutMenu.IsEmpty()) 'f}S,i +q
{ .apX72's,
pSysMenu->AppendMenu(MF_SEPARATOR); oe*&w9Y}&
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0oJ^a^|
} Gh|!FRK[$
} 9HE(*S
SetIcon(m_hIcon, TRUE); // Set big icon 4@V]zfu^Q
SetIcon(m_hIcon, FALSE); // Set small icon )ra66E
m_Key.SetCurSel(0); '*XNgvX
RegisterHotkey();
b:QFD|
CMenu* pMenu=GetSystemMenu(FALSE); LJ/qF0L!H
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,?`1ve_K<
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); N
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pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); UvZ@"El
return TRUE; // return TRUE unless you set the focus to a control DqMK[N,0
} XeSbA
@Y<tH,*
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z^/ GTY
{ n2{{S(N
if ((nID & 0xFFF0) == IDM_ABOUTBOX) jDX<iX%e
{ 6}T%m?/ }
CAboutDlg dlgAbout; {g- DM}q
dlgAbout.DoModal(); bVeTseAG
} '^l^gW/|\
else = b!J)]
{
`,Nn4
CDialog::OnSysCommand(nID, lParam); i+[3o@
} -p.*<y
} K~8tN,~&
-t6R!ZI
void CCaptureDlg::OnPaint() q83~j`ZJ$
{ 0BCGJFZ{
if (IsIconic()) E^ok`wfO
{ I26gGp
CPaintDC dc(this); // device context for painting [-t> G!)
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `MsYgd
// Center icon in client rectangle 9J7J/]7f
int cxIcon = GetSystemMetrics(SM_CXICON); WjrMd#^
int cyIcon = GetSystemMetrics(SM_CYICON); 0R}Sw[M.
CRect rect; l-S'ATZ0p
GetClientRect(&rect); akhL\-d)al
int x = (rect.Width() - cxIcon + 1) / 2; e:J'&r& 1
int y = (rect.Height() - cyIcon + 1) / 2; w2d]96*kQe
// Draw the icon AM[jL'r|
dc.DrawIcon(x, y, m_hIcon); PDt<lJU+X
} FGwnESCC
else XalJo@%-
{ =~hsKBt*
CDialog::OnPaint(); AzW7tp;t=
} Q+d.%qhc
} lU$4NUwM
3kiE3*H
HCURSOR CCaptureDlg::OnQueryDragIcon() Q)Iv_N/
{ hDljY!P>p
return (HCURSOR) m_hIcon; b6nZ55 h
} *`ZB+ \*
b0YiQjS6>
void CCaptureDlg::OnCancel() ?+n&hHRg
{ +_X,uvR
if(bTray) ypD<2z^
DeleteIcon(); ,\lYPx\P[
CDialog::OnCancel(); (!*Xhz,(-
} #0bO)m+NZ
d&|z=%9xl
void CCaptureDlg::OnAbout() >gk z4.*
{ I vTzPPP
CAboutDlg dlg; [eNkU">}
dlg.DoModal(); U{uPt*GUd/
} NoCDY2 $
.tRr?*V|l
void CCaptureDlg::OnBrowse() ietRr!$.
{ {f+N]Oo*
CString str; VG_uxKY
BROWSEINFO bi; 0R HS]cN
char name[MAX_PATH]; `^7:7Wr]=
ZeroMemory(&bi,sizeof(BROWSEINFO)); YV/>8*i
bi.hwndOwner=GetSafeHwnd(); iHAU|`'N)
bi.pszDisplayName=name; gjj 93
bi.lpszTitle="Select folder"; *jk3 \KaoV
bi.ulFlags=BIF_RETURNONLYFSDIRS; _wf5%(~b
LPITEMIDLIST idl=SHBrowseForFolder(&bi); (O\U /daB
if(idl==NULL) fdlvn*H
return; $hkq>i \
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); GE1i+.+-.
str.ReleaseBuffer(); Q
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m_Path=str; n*4lz^LR
if(str.GetAt(str.GetLength()-1)!='\\') ;LCTCt`
m_Path+="\\"; S4cpQq.
UpdateData(FALSE); o:2Q2+d
} =p<?Hu
!FTNmyM~F
void CCaptureDlg::SaveBmp() fUC9-?(K
{ !^m%O0DT
CDC dc; 'E4AV58.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); pO%{'%RA
CBitmap bm; qgoJ4Z*
int Width=GetSystemMetrics(SM_CXSCREEN); %2f//SZ:
int Height=GetSystemMetrics(SM_CYSCREEN); %$@1FlqX;
bm.CreateCompatibleBitmap(&dc,Width,Height); _7U]&Nh99
CDC tdc; N]NF\7(
tdc.CreateCompatibleDC(&dc); {esJ=FV\
CBitmap*pOld=tdc.SelectObject(&bm); bS.s?a
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]r4bRK[1
tdc.SelectObject(pOld); ~9GOk;{~&
BITMAP btm; vT|`%~Be
bm.GetBitmap(&btm); zuSq+pxL@
DWORD size=btm.bmWidthBytes*btm.bmHeight; j 5Qo*p
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,P{m k%=9
BITMAPINFOHEADER bih; kb71q:[
bih.biBitCount=btm.bmBitsPixel; 7 8Vcu'j&_
bih.biClrImportant=0; ui:=
bih.biClrUsed=0; iPq &Y*
bih.biCompression=0; : [q0S@
bih.biHeight=btm.bmHeight; ^$v3eKA
bih.biPlanes=1; A /(lK q
bih.biSize=sizeof(BITMAPINFOHEADER); aSC9&Nf;
bih.biSizeImage=size; G8nrdN-9
bih.biWidth=btm.bmWidth; >nzu],U
bih.biXPelsPerMeter=0; 3iRA$C-p
bih.biYPelsPerMeter=0; >I}9LyZt
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #2RiLht
static int filecount=0; &?0:v`4Y
CString name; :_ROJ
name.Format("pict%04d.bmp",filecount++); u: &o}[
name=m_Path+name; j%L&jH6@
BITMAPFILEHEADER bfh; .Obn&S
bfh.bfReserved1=bfh.bfReserved2=0; M*sR3SZ
bfh.bfType=((WORD)('M'<< 8)|'B'); .Da'pOe
bfh.bfSize=54+size; S4N(cn&
bfh.bfOffBits=54; .~>?*}
CFile bf; ).5RPAP
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "T2"]u<52
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); eSEq{?>
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); a2w T6jY
bf.WriteHuge(lpData,size); (@r
`$5D.b
bf.Close(); X
T[zj<&_
nCount++; a,|?5j9,P
} IvHh4DU3Z
GlobalFreePtr(lpData); POAw M
if(nCount==1) Os&n
m_Number.Format("%d picture captured.",nCount); )w h%|
else !345 %,
m_Number.Format("%d pictures captured.",nCount); 0nJE/JZ
UpdateData(FALSE); ^03j8Pc-c
} K4Sk+
v
T!RT<&
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) izgp*M,
{ 'sh~,+g
if(pMsg -> message == WM_KEYDOWN) Pq9|WV#F5/
{ @I`C#~
if(pMsg -> wParam == VK_ESCAPE) bWWXc[O2&(
return TRUE; B9R(&<4
if(pMsg -> wParam == VK_RETURN) WWKvh
return TRUE; 5U`ZbG
} TlZT1H
return CDialog::PreTranslateMessage(pMsg); \1"'E@+
} g.py+
ZFJ
N_eX/ux
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /ID3s`D)
{ ` x8J
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7hP<f}xL
SaveBmp(); : _e#
return FALSE; M`YWn ;
}
hc#!Lv
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ XfPFo6
CMenu pop; E>b2+;Jv
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ncu`vYI.
CMenu*pMenu=pop.GetSubMenu(0); Jn:ZYqc
pMenu->SetDefaultItem(ID_EXITICON); &QRE"_g
CPoint pt; C+[%7vF1
GetCursorPos(&pt); C%d_@*82
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KmG
if(id==ID_EXITICON) hu_ ^OlF
DeleteIcon(); ,.iRnR
else if(id==ID_EXIT) PyVC}dUAX
OnCancel(); 6E(Qx~iL
return FALSE; j/=iMq
} De7Ts
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Zl 9aDg
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :B3[:MpL}
AddIcon(); f-DL:@crU
return res; Z;9>S=w!
} ]Chj T}
vEf4HZ&w
void CCaptureDlg::AddIcon() ojYbR<jn9
{ Z^ }mp@j>
NOTIFYICONDATA data; %CWPbk^
data.cbSize=sizeof(NOTIFYICONDATA); b0iSn#$
CString tip; #/PA A
tip.LoadString(IDS_ICONTIP); _zlqtO
data.hIcon=GetIcon(0); ]7-&V-Ct*
data.hWnd=GetSafeHwnd(); HhO".GA
strcpy(data.szTip,tip); B8E'ddUw
data.uCallbackMessage=IDM_SHELL; g^*<f8 ~d
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z/i+EE
data.uID=98; f{SB1M
Shell_NotifyIcon(NIM_ADD,&data); d%l{V6
ShowWindow(SW_HIDE); t78k4?
bTray=TRUE; s4&^D<
} &-(463
Gt9&)/#
void CCaptureDlg::DeleteIcon() \fr-<5w7 9
{ ss;R8:5
NOTIFYICONDATA data; GfM;saTz{
data.cbSize=sizeof(NOTIFYICONDATA); A?Bif;
data.hWnd=GetSafeHwnd(); SG6sw]x
data.uID=98; !i=nSqW
Shell_NotifyIcon(NIM_DELETE,&data); >0Q|nCx
ShowWindow(SW_SHOW); AwQ?l(iZ"p
SetForegroundWindow(); v[Kxja;
ShowWindow(SW_SHOWNORMAL); qI^
/"k*5
bTray=FALSE;
4CGPOc
} `/Y{ l
9"g6C<
void CCaptureDlg::OnChange() &89oO@5
{ /x3/Ubmz~x
RegisterHotkey(); q^6 +!&"
} +F
dB '
ZvcJK4hi
BOOL CCaptureDlg::RegisterHotkey() @)SL_9
{ 7FRmx4(!
UpdateData(); Bn>8&w/P
UCHAR mask=0; ,t1abp{A
UCHAR key=0; ayAo^q
if(m_bControl) {3&|tk!*
mask|=4; pmX#E
if(m_bAlt) EI\9_}@,
mask|=2; %#$EP7"J
if(m_bShift) `"%T=w
mask|=1; PfkrOsV/m
key=Key_Table[m_Key.GetCurSel()]; $+7`Dy!
if(bRegistered){ ([xo9FP ;
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,m,)I
bRegistered=FALSE; L \;6y*K
} S4=R^];l
cMask=mask; fryJW=
cKey=key; g[w,!F
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %Q!`NCe+[
return bRegistered; }x&N^Ky3c
} r7Ya\0gU
t!IaUW
四、小结 ><=gV~7lx
`%j~|i)4
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。