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:
&jg..R
;tBc&LJ? 一、实现方法
Lrr1) h {^Y0kvnd 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:
*!~jHy8F $KmhG1*s #pragma data_seg("shareddata")
#RJFJb/ HHOOK hHook =NULL; //钩子句柄
sX8?U,u UINT nHookCount =0; //挂接的程序数目
ai3wSUYJi static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
TQor-Cymz static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
'@{'T LMCi static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^Yz.}a##w2 static int KeyCount =0;
G2 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
#QWG5 #pragma data_seg()
)L,.KO Yv!r>\#0S 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
._ 6|epJ# UBgheu DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
Vb
_W&Nwd l"C)Ia&/ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
1ymq7F(2 cKey,UCHAR cMask)
F$|Ec9 {
SR+<v=i BOOL bAdded=FALSE;
X;~3 U
9 for(int index=0;index<MAX_KEY;index++){
-0 e&>H% if(hCallWnd[index]==0){
3I" <\M4x hCallWnd[index]=hWnd;
yY3Mv/R HotKey[index]=cKey;
l2AAEB_C. HotKeyMask[index]=cMask;
@TvoCDeI bAdded=TRUE;
8[z<gxP`? KeyCount++;
_&U5 u break;
jt*VD>ji }
B%.XWW$ }
I^CKq?V?: return bAdded;
K+`$*vS~ws }
gz,x6mnQ //删除热键
1L4-hYtCj BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~O;'],#Co {
^Hdru]A$2 BOOL bRemoved=FALSE;
JdP[
cN for(int index=0;index<MAX_KEY;index++){
ZRK1UpP if(hCallWnd[index]==hWnd){
T%opkyP>= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
6v]y\+ hCallWnd[index]=NULL;
O%$XgEJ8p HotKey[index]=0;
0Rme}&$ HotKeyMask[index]=0;
n#NE.ap$&, bRemoved=TRUE;
SWrt 4G KeyCount--;
,X&(BQj h break;
T!iRg=<bz }
cNd;qO0$ }
>z,SN }
o#X=1us return bRemoved;
*Dz<Pi^ }
Nydhal00 &3o[^_Ti FtEmSKD DLL中的钩子函数如下:
7jf%-X [i
] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
3RW3<n {
HxH.=M8S_ BOOL bProcessed=FALSE;
KBb{Z;% if(HC_ACTION==nCode)
.3tyNjsn\ {
`H^?jX>7 if((lParam&0xc0000000)==0xc0000000){// 有键松开
hv6w=?7 switch(wParam)
B(omD3jzN {
uia[>&2 case VK_MENU:
3hPj;-u MaskBits&=~ALTBIT;
x'uxSeH$ break;
}gfs case VK_CONTROL:
~@v<B
I MaskBits&=~CTRLBIT;
?)60JWOJ1 break;
MgP6ki1z case VK_SHIFT:
nVK`H@5fw MaskBits&=~SHIFTBIT;
Gx$rk<;ZW break;
oD0N<Ln} default: //judge the key and send message
#U=}Pv~wM break;
'(qVA>S }
:kaHvf for(int index=0;index<MAX_KEY;index++){
#Is/j = if(hCallWnd[index]==NULL)
0VA$
Ige continue;
uPp9
UW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o|FY-+ {
IhRYV`: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
RyJN=;5p bProcessed=TRUE;
[xrM){ItW }
fV\ eksBF }
(16U]s }
qXb{A*J else if((lParam&0xc000ffff)==1){ //有键按下
ckZZ)lW`* switch(wParam)
r2Wx31j{ {
pFUW7jE case VK_MENU:
mHnHB.OL MaskBits|=ALTBIT;
)Q!3p={S* break;
*/kX|Sur case VK_CONTROL:
o
C5}[cYD` MaskBits|=CTRLBIT;
R>3a?.X break;
X`,]@c%C` case VK_SHIFT:
i;yr=S,a0/ MaskBits|=SHIFTBIT;
Gz>M`M`[4 break;
l5 FM>q default: //judge the key and send message
[T5z}!_y break;
+yh-HYo` }
z@_9.n] for(int index=0;index<MAX_KEY;index++){
9 aE.jpN if(hCallWnd[index]==NULL)
e/h2E dY continue;
?;//%c8,. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bay7%[BLB {
1e0O-aT#Q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K yqFeR bProcessed=TRUE;
+&T;jad2 }
X+:>&&9 }
X~H~k1 }
/!u#S9_B if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Q]?Lg for(int index=0;index<MAX_KEY;index++){
wl*"Vagb if(hCallWnd[index]==NULL)
$oJ)W@> continue;
x+L
G4++ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
XyS|7#o SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_QhB0/C //lParam的意义可看MSDN中WM_KEYDOWN部分
<Bmqox0 }
jMT];%$[ }
icX$<lD }
6L2Si4OGjG return CallNextHookEx( hHook, nCode, wParam, lParam );
Ww
}qK|D }
e^Ds|}{V WLb*\ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
u_5O<UP5
`#m>3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
9O%4x"*PO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Ix"hl0Kh )ZU=`!4 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Tath9wlv6; 7=o2$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
m^8KHa {
wR"4slY_% if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
P p}N-me>_ {
|?t6h 5Mt" //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
\n@S.Y?P SaveBmp();
(f5v{S6b( return FALSE;
e|L$e0 }
R/yOy^< …… //其它处理及默认处理
h%hE$2 }
ATeXOe +dkbt%7M {GaQV-t 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。
$rZ:$d.C .45XS>=z# 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。
%PsDS QSn%~o05 二、编程步骤
4E Hb gAx8r-` ` 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";
) OqQz7' 8\M%\]_ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
$jd>=TU| pearf2F 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
H3#xBn>9 -V'`;zE6 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
%HRFH =,aWO7Pz 5、 添加代码,编译运行程序。
5X7kZ!r (okCZ-_Jn 三、程序代码
IZm_/ iw Hy!Vi-5 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
s$ONht #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
/12D >OK
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
^ExA #if _MSC_VER > 1000
[\h k_(} #pragma once
*>=vSRL0_ #endif // _MSC_VER > 1000
]~,V(K #ifndef __AFXWIN_H__
mErXdb|L #error include 'stdafx.h' before including this file for PCH
u5f+%!p #endif
~urV`J #include "resource.h" // main symbols
C +-< class CHookApp : public CWinApp
J,s)Fu\j@ {
$z7[RLu0! public:
9`8\<a'rU CHookApp();
+[ _)i9a // Overrides
'~-Lxvf' // ClassWizard generated virtual function overrides
!;SpQ28 //{{AFX_VIRTUAL(CHookApp)
w"CcWng1 public:
~3{C&c virtual BOOL InitInstance();
\ B~9Ue! virtual int ExitInstance();
CfMq?.4%E} //}}AFX_VIRTUAL
&FWPb# //{{AFX_MSG(CHookApp)
_v=@MOI/J // NOTE - the ClassWizard will add and remove member functions here.
qAH@)} // DO NOT EDIT what you see in these blocks of generated code !
HQ%-e5Q //}}AFX_MSG
Z\=].[,w4 DECLARE_MESSAGE_MAP()
;Yrg4/Ipa };
Mk=;UBb$X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
TQ?D*& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
H=vrF - # BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:E|HP#iwu BOOL InitHotkey();
1i}Rc: BOOL UnInit();
i<g|+}I #endif
ObC <v?9:} //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
(}Ql#q
K #include "stdafx.h"
#vy:aq<bjE #include "hook.h"
"y>\
mC #include <windowsx.h>
(/&IBd- #ifdef _DEBUG
JM{S49Lx #define new DEBUG_NEW
%h**L'~`` #undef THIS_FILE
H|='|k5Y. static char THIS_FILE[] = __FILE__;
28[dTsd% #endif
F|*{Ma #define MAX_KEY 100
d{.cIv #define CTRLBIT 0x04
a;Ic!:L #define ALTBIT 0x02
{xw*H<"f< #define SHIFTBIT 0x01
'0|AtO77 #pragma data_seg("shareddata")
9.|+KIRb HHOOK hHook =NULL;
uQN8/Gy*J UINT nHookCount =0;
}>JFO:v& static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@GGzah# static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
ZdEeY|j static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
u93=>S static int KeyCount =0;
0(s0<9s% static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
d\`A
^ #pragma data_seg()
t"`LJE._P HINSTANCE hins;
&nk6_{6
c void VerifyWindow();
6Q,-ZM=Z_p BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
#Zpp*S55 //{{AFX_MSG_MAP(CHookApp)
(Rvke!"B // NOTE - the ClassWizard will add and remove mapping macros here.
Wh%qvV6] // DO NOT EDIT what you see in these blocks of generated code!
W[o~AbU //}}AFX_MSG_MAP
pmyHto" END_MESSAGE_MAP()
J/j1Yf'9 I)ub='+&; CHookApp::CHookApp()
v]g/
5qI& {
e-4XNL[F // TODO: add construction code here,
sk~rjH]-g$ // Place all significant initialization in InitInstance
g$~3 @zD }
WYTeu " {
p {a0*$5 CHookApp theApp;
rE"`q1b# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ZVpMR0! {
YzU(U_g$ BOOL bProcessed=FALSE;
L0SeG: if(HC_ACTION==nCode)
E|D~:M%~ {
*=L3bBu? if((lParam&0xc0000000)==0xc0000000){// Key up
h0NM5 switch(wParam)
o#{D;' {
;$@7iL case VK_MENU:
XM3N>OR. MaskBits&=~ALTBIT;
4NL TtK break;
59";{"sw case VK_CONTROL:
lIO.LF3 MaskBits&=~CTRLBIT;
R2Fh
WiL break;
CzxU
@ case VK_SHIFT:
1TfK"\ MaskBits&=~SHIFTBIT;
]]$s"F< break;
*L8Pj`zR default: //judge the key and send message
Q44Pg$jp break;
9|dgmEd }
PYqx&om for(int index=0;index<MAX_KEY;index++){
4VPL
-":6 if(hCallWnd[index]==NULL)
< vU<:S continue;
~#iRh6^98 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
KzZ!
CB\ {
KotJ,s]B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
o)'T#uK bProcessed=TRUE;
EA%(+tJ^0 }
s
bd;Kn }
(,PO( }
JxI}#iA else if((lParam&0xc000ffff)==1){ //Key down
vpx8GiV switch(wParam)
`h12 {
{zBf *x case VK_MENU:
aksyr$d0V< MaskBits|=ALTBIT;
bL
(g$Yi break;
sT dD=> case VK_CONTROL:
Z{`;Ys:zk MaskBits|=CTRLBIT;
bp2l%A; break;
0F sz case VK_SHIFT:
pt;E~_ MaskBits|=SHIFTBIT;
bC?uyo" break;
F ^Rt
6Io default: //judge the key and send message
>/1N#S#9 break;
~%_$e/T }
9 )u*IGj for(int index=0;index<MAX_KEY;index++)
6
k+FTDL {
J&S$F:HM if(hCallWnd[index]==NULL)
q2 D2:0^ 2 continue;
@HJ&"72$< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jdQ`Y+BC {
Ol:&cX3G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
LF
<fp&C)h bProcessed=TRUE;
F{ J>=TC }
Wm4@+} }
-Ep cX!i }
aM?Xi6
U5 if(!bProcessed){
< i*v for(int index=0;index<MAX_KEY;index++){
O5{!CT$ if(hCallWnd[index]==NULL)
4x.'H18 continue;
*PE1)bF if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
X>EwJ"q# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
j]}A"8=1 }
d/Xbk%`p }
cu(2BDfiL }
2V_C_5)1 return CallNextHookEx( hHook, nCode, wParam, lParam );
),0_ C\ }
8I04Nx
eIK8J,- BOOL InitHotkey()
:L&Bbw( {
xn1 if(hHook!=NULL){
uQWJ7Xm nHookCount++;
Lv+lLK return TRUE;
*W,"UL6U8y }
E~ _2Jf\U else
|E0>-\6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
gxpR#/(E~ if(hHook!=NULL)
jZS6f*$ nHookCount++;
CL|t!+wU/ return (hHook!=NULL);
:}TT1@ }
_Xd,aLoo BOOL UnInit()
AU} e^1h {
z:bxnM2\ if(nHookCount>1){
<",4O nHookCount--;
4m$n Vv return TRUE;
[ jve
|-v= }
"DM$FRI0 BOOL unhooked = UnhookWindowsHookEx(hHook);
{MU>5\ if(unhooked==TRUE){
.2/(G{}U nHookCount=0;
9r@r\- hHook=NULL;
FOgF'!K }
@26H; return unhooked;
AZt~ \qf }
G+
PBV%gE[ n|IdEgD$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|_8::kir: {
1.!rq,+>1 BOOL bAdded=FALSE;
RK#e7 for(int index=0;index<MAX_KEY;index++){
GrjL9+|x if(hCallWnd[index]==0){
^RrufwUA hCallWnd[index]=hWnd;
OaRtGJnR HotKey[index]=cKey;
9d^o2Yo HotKeyMask[index]=cMask;
#>GUfhou) bAdded=TRUE;
Bu">)AnN KeyCount++;
T!eeMsI break;
D`0II= }
PmyS6a@ }
]h~=lItTRZ return bAdded;
:q S=_!1 }
bVSa}&*kM .cN\x@3-j BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(p26TN;*$5 {
%h 6?/ BOOL bRemoved=FALSE;
)Xg,;^ for(int index=0;index<MAX_KEY;index++){
zI8Q "b if(hCallWnd[index]==hWnd){
A>(m}P if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
*,{. oO9# hCallWnd[index]=NULL;
&N GYV HotKey[index]=0;
RN238]K HotKeyMask[index]=0;
&^FCp'J- bRemoved=TRUE;
iq-n(Rfw~ KeyCount--;
2-j+-B|i break;
, fFB.q"
}
hc2[,Hju{O }
T5.1qr L }
GJai!$v return bRemoved;
PF*<_p" j }
Q]Q i >|WNsjkU% void VerifyWindow()
Brr{iBz*" {
&F9BaJ for(int i=0;i<MAX_KEY;i++){
u*Z>&]W_ if(hCallWnd
!=NULL){ zM"OateA
if(!IsWindow(hCallWnd)){ VI0^Zq!6R
hCallWnd=NULL; I0P)DR
HotKey=0; bPEf2Z
G4
HotKeyMask=0; ~Tq
`c
KeyCount--; 87c7p=/0`
} 6|wiZw
} /1ooOq]
} z8{ kwz
} trnjOm
&Z/aM?
BOOL CHookApp::InitInstance() !}|n3wQ
{ a_4Ny
AFX_MANAGE_STATE(AfxGetStaticModuleState()); <KqZ.7XfB
hins=AfxGetInstanceHandle(); 4\4onCzuT
InitHotkey(); =:n>yZ3T
return CWinApp::InitInstance(); 4YM!S E-I
} W_9-JM(r
~Wjm"|c
int CHookApp::ExitInstance() 7tMV*{+Z
{ I]bqle0M
VerifyWindow(); evNo(U\C
UnInit(); 1%Xwk2l,8b
return CWinApp::ExitInstance(); uFOxb}a9v
} fs+l
(xpj?zlmM
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;E>5<[aa
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wx nD3
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Wk"4mq
#if _MSC_VER > 1000 /"+YE&>\
#pragma once e p~3e5
#endif // _MSC_VER > 1000 ne] |\]
}GJIM|7^
class CCaptureDlg : public CDialog v]\io#
{ eyf\j,xP&
// Construction 0ohpJh61Q
public: )$Xd#bzD|
BOOL bTray; A9\m.3jo
BOOL bRegistered; Y,?s-AB
BOOL RegisterHotkey(); Ks.m5R
UCHAR cKey; u"XqWLTV
UCHAR cMask; "- S2${
void DeleteIcon(); |F[E h
~
void AddIcon(); Vd~{SS2>
UINT nCount; Hq[d!qc
void SaveBmp(); )kR~|Yn<-
CCaptureDlg(CWnd* pParent = NULL); // standard constructor /KjRB_5~q}
// Dialog Data #-dfG.*
//{{AFX_DATA(CCaptureDlg) JUXIE y^
enum { IDD = IDD_CAPTURE_DIALOG }; pXf@Y}mH
CComboBox m_Key; uN20sD}
BOOL m_bControl; W#87T_7T[
BOOL m_bAlt; U.is:&]E
BOOL m_bShift; y}*rRm.:
CString m_Path; 2.CjjI
CString m_Number; ?9xaBWf
//}}AFX_DATA ?F]Yebp^
// ClassWizard generated virtual function overrides Xd/gvg{??0
//{{AFX_VIRTUAL(CCaptureDlg) \GS]jhEtn
public: 8Kt_irD
virtual BOOL PreTranslateMessage(MSG* pMsg); ^IGutZov
protected: {E1g+><
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support opxVxjTT#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WV}<6r$e
//}}AFX_VIRTUAL RpPbjz~
// Implementation .|
CcUmx
protected: BTjfzfO"
HICON m_hIcon; 8"/5Lh(
// Generated message map functions }ozlED`E
//{{AFX_MSG(CCaptureDlg) ;> **+ezF
virtual BOOL OnInitDialog();
/B)ZB})z
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H6(kxpOI\
afx_msg void OnPaint(); oVutHt
afx_msg HCURSOR OnQueryDragIcon(); gXN#<g,:^
virtual void OnCancel(); ]Aap4+s
afx_msg void OnAbout(); E;$)Oz
afx_msg void OnBrowse(); >y)(M(o
afx_msg void OnChange(); 7_C;-
//}}AFX_MSG qYv/"
1
DECLARE_MESSAGE_MAP() *5Upb,**
}; x'kwk
#endif ',j'Hf
wr{03mQHxp
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f>\OT
#include "stdafx.h" w='1uV<6
#include "Capture.h" ;ZZ%(P=-
#include "CaptureDlg.h" \~!9T5/*
#include <windowsx.h> Z*S
9pkWcF
#pragma comment(lib,"hook.lib") e@' rY#:u
#ifdef _DEBUG }YJ(|z""
#define new DEBUG_NEW ?Q1(L$-=
#undef THIS_FILE g.OBh_j-v
static char THIS_FILE[] = __FILE__; &EKP93
#endif WF\
hXO
#define IDM_SHELL WM_USER+1 +shT}$cb1
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;@p2s'(
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `3+yu'
Q'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G0Zq:kJ
class CAboutDlg : public CDialog #k2&2W=x
{ a$ a+3}\
public: )R$+dPu>
CAboutDlg(); 7uG@hL36
// Dialog Data _"n1"%Ns
//{{AFX_DATA(CAboutDlg) $O" S*)9
enum { IDD = IDD_ABOUTBOX }; $G/h-6+8
//}}AFX_DATA "+3p??h%Rq
// ClassWizard generated virtual function overrides z3+y|nx!
//{{AFX_VIRTUAL(CAboutDlg) AY4ZU CqI
protected: Q!K@
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pFi.?|6"
//}}AFX_VIRTUAL & V:q}Q
// Implementation 1~:7W
protected: (\m4o
//{{AFX_MSG(CAboutDlg) xc dy/J&
//}}AFX_MSG {[WEA^C~Q
DECLARE_MESSAGE_MAP() hZ|*=/3k
}; eq.K77El{J
d%_v
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ].53t"*
{ (pM5B8U
//{{AFX_DATA_INIT(CAboutDlg) S|!)_RL
//}}AFX_DATA_INIT a@ `1 5O:
} |_L\^T|6
!xmvCH=2
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +7n;Bsk
_
{ `<&RZB2
CDialog::DoDataExchange(pDX); cPA-EH
//{{AFX_DATA_MAP(CAboutDlg) Pk/{~!+
$
//}}AFX_DATA_MAP NIufL
}6\
} cF!ygz//
kbzzage6L
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IJHNb_Cku
//{{AFX_MSG_MAP(CAboutDlg) @
hH;d\W#
// No message handlers 2[f8"'lUQ
//}}AFX_MSG_MAP ?dMyhU}
END_MESSAGE_MAP() z{:T~s
*0zdI<Oe
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *y[i~{7:
: CDialog(CCaptureDlg::IDD, pParent) Jydz2
zt!
{ )6U&^9=
//{{AFX_DATA_INIT(CCaptureDlg) H.|v^e
m_bControl = FALSE; ({ 'I;]AQ
m_bAlt = FALSE; {3=M-U~r
m_bShift = FALSE; am.}2QZU
m_Path = _T("c:\\"); #4S">u
m_Number = _T("0 picture captured."); HqNM3 1)
nCount=0; N,U<.{T=A
bRegistered=FALSE; bM7y}P5`1
bTray=FALSE; oC0K!{R*
//}}AFX_DATA_INIT [=*c8
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 's]I:06A
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P0O5CaR
} WE\@ArY>
?U'c;*O-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pN# \
{ 2)}ic2]pn
CDialog::DoDataExchange(pDX); iu!j#VO
//{{AFX_DATA_MAP(CCaptureDlg) x+Vp&
DDX_Control(pDX, IDC_KEY, m_Key); 1SIhW:C
DDX_Check(pDX, IDC_CONTROL, m_bControl); w$I<WS{J:Z
DDX_Check(pDX, IDC_ALT, m_bAlt); l`c&nf6
DDX_Check(pDX, IDC_SHIFT, m_bShift); ,b;eU[!]
DDX_Text(pDX, IDC_PATH, m_Path); ERcj$ [:T(
DDX_Text(pDX, IDC_NUMBER, m_Number); O=E"n*U
//}}AFX_DATA_MAP 9sYN7x
} `s
HrC
ZuZe8&
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) yZ?|u57
//{{AFX_MSG_MAP(CCaptureDlg) I4'mU$)U
ON_WM_SYSCOMMAND() N8a+X|3]0
ON_WM_PAINT() p6~\U5rXm
ON_WM_QUERYDRAGICON() Yw7+wc8R
ON_BN_CLICKED(ID_ABOUT, OnAbout) ^Wb|Pl
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L=Cm0q 3v
ON_BN_CLICKED(ID_CHANGE, OnChange) R'RLF
=
//}}AFX_MSG_MAP Hq9yu*!u
END_MESSAGE_MAP() sOzmw^7
*m2{6N_
BOOL CCaptureDlg::OnInitDialog() 9pAklD 4
{ r #H(kJu,
CDialog::OnInitDialog(); V,t&jgG*
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j8/rd
ASSERT(IDM_ABOUTBOX < 0xF000); I*cB
Ha
CMenu* pSysMenu = GetSystemMenu(FALSE); W rvSYqN
if (pSysMenu != NULL) 2<&lrsh
{ c%p7?3Ry
CString strAboutMenu; S[p.`<{J
strAboutMenu.LoadString(IDS_ABOUTBOX); 7_t\wmvYp
if (!strAboutMenu.IsEmpty()) +$Q.N{LV
{ ,<iJ#$:
Sx
pSysMenu->AppendMenu(MF_SEPARATOR); !YD~o/t@|
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Hkq""'Mx+w
} ap|7./yg
} Qw>ftle
SetIcon(m_hIcon, TRUE); // Set big icon x3ds{Z$,>(
SetIcon(m_hIcon, FALSE); // Set small icon GFM$1}
m_Key.SetCurSel(0); >q+o
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RegisterHotkey(); J9s4lsea
CMenu* pMenu=GetSystemMenu(FALSE); vY|{CBGbd
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wX(h]X"q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); paFiuQ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d+FS
return TRUE; // return TRUE unless you set the focus to a control 6zuWG0t
} E/x2LYH
(`S32,=TS
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V%k #M
{ Z"spua5
if ((nID & 0xFFF0) == IDM_ABOUTBOX) tbz?th\#
{ OsS5WY0H
CAboutDlg dlgAbout; JP$@*F@t
dlgAbout.DoModal(); J:6wFmU
} bb<qnB
else _86pbr9
{ ,S"a ,}8
CDialog::OnSysCommand(nID, lParam); PF$K> d
} a<AT;Tc
} o$dnp`E
K/oC+Z;K
void CCaptureDlg::OnPaint() |#<PI9)`
{ Y=RdxCCx4
if (IsIconic()) ]ZJu
{ E]zTd$v6
CPaintDC dc(this); // device context for painting >uMj}<g#Z?
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n_G< /8
// Center icon in client rectangle FPM@%U
int cxIcon = GetSystemMetrics(SM_CXICON); 6Y!hz7D
int cyIcon = GetSystemMetrics(SM_CYICON); S3cjw9V
CRect rect; *}BaO*A
GetClientRect(&rect); MUo}Qi0K
int x = (rect.Width() - cxIcon + 1) / 2; Z";~]]$!Y
int y = (rect.Height() - cyIcon + 1) / 2; K9JW&5Q
// Draw the icon x!6&)T?!n
dc.DrawIcon(x, y, m_hIcon); K$>C*?R
} H.\gLIr
else C>%2'S^.b
{ Rw4"co6
CDialog::OnPaint(); (r8Rb*OP
} HJFt{tq2
} 8Ar5^.k
6{2LV&T=u
HCURSOR CCaptureDlg::OnQueryDragIcon() dz^l6<a"n
{ 1pe eecE
return (HCURSOR) m_hIcon; DP E NYr
} IyTL|W6
t__UqCq~h
void CCaptureDlg::OnCancel() nC Mv&{~
{ #BA=?7
if(bTray) -{z.8p}IW
DeleteIcon(); (1.E9+MquU
CDialog::OnCancel(); 2&*r1NXBE
} |\g =ua+h
4]c.mDo[T
void CCaptureDlg::OnAbout() =-#>NlB$w
{
D{hsa
CAboutDlg dlg; weMC9T)B
dlg.DoModal(); WfbG }%&J
} :W'Yt9v)
J23Tst#s
void CCaptureDlg::OnBrowse() >;@ _TAF
{ .~#<>
CString str; rLMjN#`^
BROWSEINFO bi; <DG=qP6O
char name[MAX_PATH];
VgfA&?4[
ZeroMemory(&bi,sizeof(BROWSEINFO)); YGp8./ma<I
bi.hwndOwner=GetSafeHwnd(); {J`Zl1_q
bi.pszDisplayName=name; 0fgt2gA33
bi.lpszTitle="Select folder"; [%U(l<
bi.ulFlags=BIF_RETURNONLYFSDIRS; 21Z}Zj
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Lf+M
+^l
if(idl==NULL) md`PRZzj@
return; 0(A(Vb5J.T
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); an+`>}]F
str.ReleaseBuffer(); lq2P10j@
m_Path=str; b!W!Vvf^x
if(str.GetAt(str.GetLength()-1)!='\\') ICSi<V[y1
m_Path+="\\"; $$E!u}
UpdateData(FALSE); 2{!o"6t
} [t^Z2a{
7CfHL;+m<4
void CCaptureDlg::SaveBmp() Fb#_(I[aj
{ wLeP;u1
CDC dc; 8l(_{Y5(-
dc.CreateDC("DISPLAY",NULL,NULL,NULL); fVCpG~&t
CBitmap bm; .ztO._J7f
int Width=GetSystemMetrics(SM_CXSCREEN); y8T%g(
int Height=GetSystemMetrics(SM_CYSCREEN); m`(5B
bm.CreateCompatibleBitmap(&dc,Width,Height); fp^!?u
CDC tdc; ve|:z
tdc.CreateCompatibleDC(&dc); ${"+bWG2G!
CBitmap*pOld=tdc.SelectObject(&bm); ?m3,e&pB5
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xA|72!zk0P
tdc.SelectObject(pOld); Fl,(KSTz
BITMAP btm; c}9.Or`?
bm.GetBitmap(&btm); YGVj$\
DWORD size=btm.bmWidthBytes*btm.bmHeight; UEeD Nl$^u
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3nVdws
BITMAPINFOHEADER bih; 96fzSZS,
bih.biBitCount=btm.bmBitsPixel; YEGRM$'`
bih.biClrImportant=0; C[h"w'A2
bih.biClrUsed=0; T;(k
bih.biCompression=0; h+o-h4X
bih.biHeight=btm.bmHeight; |KR;$e&
bih.biPlanes=1; `usX(snY
bih.biSize=sizeof(BITMAPINFOHEADER); I_"1.
bih.biSizeImage=size;
hS)X`M
bih.biWidth=btm.bmWidth; vu^ '+ky
bih.biXPelsPerMeter=0; hr9[$4'H
bih.biYPelsPerMeter=0; @y,pfWh`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BM+v,hGY
static int filecount=0; N%Gb
CString name; 5[Sa7Mk
name.Format("pict%04d.bmp",filecount++); -nP
y?>p"|
name=m_Path+name; rt+%&%wt
BITMAPFILEHEADER bfh; gkDyWZG B
bfh.bfReserved1=bfh.bfReserved2=0; 3ifQKKcR{
bfh.bfType=((WORD)('M'<< 8)|'B'); _U%a`%tU.
bfh.bfSize=54+size; 29R_?HBH
bfh.bfOffBits=54; HyKvDJ
3_
CFile bf; ay}}v7)GM
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0fhz7\a^_<
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E<u6 js,
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fi*@m,-
bf.WriteHuge(lpData,size); nCF1i2*6|"
bf.Close(); LadE4:oy
nCount++; df}DJB
} nH*JR
GlobalFreePtr(lpData); R"NR-iU
if(nCount==1) J[6`$$l0
m_Number.Format("%d picture captured.",nCount); y7ng/vqM7
else ZzZy2.7
m_Number.Format("%d pictures captured.",nCount); yu ~Rk
UpdateData(FALSE); dtHB@\1
} 4[=vt
e nsou!l
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,,_$r7H`
{ r+6=b"
if(pMsg -> message == WM_KEYDOWN) B%Pg:|
{ I<p- o/TP
if(pMsg -> wParam == VK_ESCAPE) Z(F`M;1>xI
return TRUE; JHN{vB
if(pMsg -> wParam == VK_RETURN) XcfvmlBoD-
return TRUE; 8G&'ED_&
} 7[=MgnmuC
return CDialog::PreTranslateMessage(pMsg);
jQDXl
} .xnJT2uu'
}=.:bwX5
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Bp
#:sAG
{ M^f+R'Q3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0s>ozAJ
SaveBmp(); l]
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return FALSE; l423+vo
} 5Oh>r K(
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Uy$1X
CMenu pop; <Lz/J-w
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); fO6i
CMenu*pMenu=pop.GetSubMenu(0); Pc"g
pMenu->SetDefaultItem(ID_EXITICON); 8UY[$lc
CPoint pt; |Nx7jGd:i
GetCursorPos(&pt); /_yJ;l/K
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;[pY>VJ(
if(id==ID_EXITICON) oHo@rGU
DeleteIcon(); ces|HPBa&6
else if(id==ID_EXIT) 3zdm-5R.b
OnCancel(); v/NkG;NWM
return FALSE; 6|h~pH
} eiTG
LRESULT res= CDialog::WindowProc(message, wParam, lParam); g9N_s,3jC
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) i@Vi.oc4[
AddIcon(); ?]1_ 2\M
return res; Q]n a_'_
} Pra,r9h,
bq+Q$#F2X
void CCaptureDlg::AddIcon() o*\Fj}l-
{ >M `ryM2=D
NOTIFYICONDATA data; G)|s(C!
data.cbSize=sizeof(NOTIFYICONDATA); E@uxEF
CString tip; nIWZo ~
tip.LoadString(IDS_ICONTIP); uH"W07
data.hIcon=GetIcon(0); Ze?(N~
data.hWnd=GetSafeHwnd(); j,:vK
strcpy(data.szTip,tip); Ml bQLtw
data.uCallbackMessage=IDM_SHELL; ;:)1:Dy5
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1/hk3m(C
data.uID=98; 86_`Z$ s
Shell_NotifyIcon(NIM_ADD,&data); Qv v~nGq$
ShowWindow(SW_HIDE); Ms
*
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bTray=TRUE; `Z)]mH\X
} }VetaO2*
wO>P<KBU
void CCaptureDlg::DeleteIcon() &_1Ivaen6
{ cV|u]ce%1
NOTIFYICONDATA data; klUW_d-
data.cbSize=sizeof(NOTIFYICONDATA); ZSs)AB_Pe/
data.hWnd=GetSafeHwnd(); =zetZJg
data.uID=98; ke~S[bL%-
Shell_NotifyIcon(NIM_DELETE,&data); # Vq"Cf
ShowWindow(SW_SHOW); D(z}c,
SetForegroundWindow(); 7ThGF
ShowWindow(SW_SHOWNORMAL); L5wrc4
bTray=FALSE; szZ8-Y
} PF6w'T 5
7BNu.5*y
void CCaptureDlg::OnChange() MPS{MGVjbJ
{ 3$~6+i
RegisterHotkey(); n"Gow/-;
} q8Z,XfF^S
..Dr?#Cr
BOOL CCaptureDlg::RegisterHotkey() 3M@!?=|U
{ AbXaxt/[g?
UpdateData(); 1G6 %?Iph
UCHAR mask=0; Ok/U"N-
UCHAR key=0; CcDi65s
if(m_bControl) et-<ib<lY
mask|=4; mW+QJ` 3
if(m_bAlt) _--kK+rU
mask|=2; Gdi8Al]\Nl
if(m_bShift) koTb{U L
mask|=1; ~[wh
key=Key_Table[m_Key.GetCurSel()]; q.GA\o
if(bRegistered){ #0F6{&;
M
DeleteHotkey(GetSafeHwnd(),cKey,cMask); o(q][:,h
bRegistered=FALSE; li`4&<WGC
} L2NO_N
cMask=mask; C{5^UCJkg
cKey=key; cD!yd^QE
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K]bw1KK
return bRegistered; S2!$
} 0r |mg::'
Da@H^
四、小结 "&Y5Nh
:t'*fHi~
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。