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:
>HkhAJhW
hhRaJ 一、实现方法
: \V,k~asl sM\&.<B 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^Qx/uTKw OKwOugi0 #pragma data_seg("shareddata")
|#5 e|z5( HHOOK hHook =NULL; //钩子句柄
QV,E#(\5 UINT nHookCount =0; //挂接的程序数目
Gm=>!.p static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
{^RG%
&S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
xNdID j@ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
!jh%}JJ static int KeyCount =0;
`"y{;PCt_ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
vrrt @y #pragma data_seg()
<Dw]yGK@ ~LE[,
I:q 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。
C*wdtEGq _dmL}t- 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:
EZ% .M*? x%XT2+ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
,8SWe cKey,UCHAR cMask)
l`rC0kJ] {
XNmQ?`.2' BOOL bAdded=FALSE;
2bA#D%PHD for(int index=0;index<MAX_KEY;index++){
g{DFS[h if(hCallWnd[index]==0){
aV|k}H{wt hCallWnd[index]=hWnd;
~ v1W HotKey[index]=cKey;
R#6H'TVE HotKeyMask[index]=cMask;
~u/@rqF bAdded=TRUE;
r>3^kL5UI KeyCount++;
k46gY7y,9 break;
QAaF@Do }
(
Yi=v'd }
2YIF=YWO}, return bAdded;
G\mKCaI8 }
jyjQzt
>\ //删除热键
0!IPcZjY7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
?Y!U*& 7 {
b{HhS6<K? BOOL bRemoved=FALSE;
V
[4n'LcE for(int index=0;index<MAX_KEY;index++){
|4xo4%BQ> if(hCallWnd[index]==hWnd){
h3t$>vs2F" if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$n*%v85 hCallWnd[index]=NULL;
t,?,F4j HotKey[index]=0;
}*-u$=2 HotKeyMask[index]=0;
:C}H y bRemoved=TRUE;
{*__B} ,N KeyCount--;
/d]~ly
@uI break;
HwW6tQ }
.P%ym~S }
#[,= 1Od(q }
q4k`)?k9 return bRemoved;
/yt7#!tm+ }
B$DZ]/< \CtQ*[FmN V@Kn24'' DLL中的钩子函数如下:
/.2u.G Dpj-{q7C LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|=,83,a {
9RB`$5F;
BOOL bProcessed=FALSE;
rV U:VL`2 if(HC_ACTION==nCode)
skK*OO2- {
DOT=U
_ if((lParam&0xc0000000)==0xc0000000){// 有键松开
qhN[Dj(d switch(wParam)
x i.IRAZX {
p~FQcW'a~ case VK_MENU:
;fkSrdj MaskBits&=~ALTBIT;
!3QRzkJX~ break;
&!OGIYC( case VK_CONTROL:
:F9q> MaskBits&=~CTRLBIT;
SLg+H break;
'Y ,1OK case VK_SHIFT:
lJlZHO MaskBits&=~SHIFTBIT;
'hy?jQ'|e break;
?'Oj=k"c7 default: //judge the key and send message
?;+ ^ break;
>6k}HrS1V }
yqYhe-" for(int index=0;index<MAX_KEY;index++){
:TlAL#
s& if(hCallWnd[index]==NULL)
7|K3WuLL continue;
sK `<kbj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\a?K?v|8 {
)7k&`?Mh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
xl3zy~;M bProcessed=TRUE;
keaj3#O }
>6IXuq }
hR!}u}ECd }
f.J9) lfb else if((lParam&0xc000ffff)==1){ //有键按下
{v,{x1 switch(wParam)
!e&rVoA {
](_{,P case VK_MENU:
J"5jy$30'$ MaskBits|=ALTBIT;
mF}c-
D break;
m$,cH>E case VK_CONTROL:
@81-kdTx MaskBits|=CTRLBIT;
%3rTQ:X break;
C1KfXC*|L case VK_SHIFT:
[gpOuTW MaskBits|=SHIFTBIT;
O@nqHZ break;
Q!YF!WoBX default: //judge the key and send message
DCt\E/ break;
I/Sv"X6E }
*}>Bkq9h for(int index=0;index<MAX_KEY;index++){
Q! Kn|mnN if(hCallWnd[index]==NULL)
F%9cS
: continue;
<b6s&"%= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P@2tR5<R {
NvUu. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
"\4]X"3<+ bProcessed=TRUE;
d [)_sa }
I$+%~4 }
+mivqR~{{ }
nDyvX1] if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
nrF%wH/5 for(int index=0;index<MAX_KEY;index++){
"|F.'qZrm if(hCallWnd[index]==NULL)
u/_Gq[Q,u continue;
RV(
w%g if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
tvTWZ` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]vRVo6@ k //lParam的意义可看MSDN中WM_KEYDOWN部分
C5>{Q:.`e' }
5woIGO3X }
D}mo\ }
r4 9UJE return CallNextHookEx( hHook, nCode, wParam, lParam );
MhHr*!N"} }
Uc\|X;nkRk Q.rB\8ea 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:
=*{K@p_ BO8%:/37[4 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
`x2fp6
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
=t@:F -zPm{a 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:
v;K{|zUdB J f\Qf LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
$|>6z_3% {
_u#/u2< if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
NnJ>0|74g {
$/4Wod*l //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
)W[KD,0+j SaveBmp();
uOyLC<I/ return FALSE;
<FXQxM5" }
Bx\#`Y …… //其它处理及默认处理
b%=1"&JI: }
A28ZSL F(T=WR].o (jp1; #P! 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。
;6DR.2}?> &Tf=~6 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。
o%vIkXw /IGrp.} 二、编程步骤
Ytl:YzXCi V_NjkyI 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";
PFImqojHd ^AovkK(p 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Ln"+nKr fMWXo)rzj 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;
|usnY [{6&.v 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;
H=JP3ID>{ H j>L>6> 5、 添加代码,编译运行程序。
FiV^n6-F` R*JOiVAC 三、程序代码
h#(.(d 27h/6i3 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
sW>P- #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
1G e)p4 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
"uV0Oj9: #if _MSC_VER > 1000
}M"-5K} #pragma once
v:'P"uU;4 #endif // _MSC_VER > 1000
[15hci+- #ifndef __AFXWIN_H__
i~v@ #error include 'stdafx.h' before including this file for PCH
rwi2kk#@P #endif
{GGO')p #include "resource.h" // main symbols
$5 q{vy class CHookApp : public CWinApp
/ieu)m:2 {
~Mg8C9B?%3 public:
~2, wI<Nz CHookApp();
B}TInI%H // Overrides
L<[,7V // ClassWizard generated virtual function overrides
aT`02X //{{AFX_VIRTUAL(CHookApp)
o
m{n"cg public:
&?`d8\z virtual BOOL InitInstance();
a$+e8> virtual int ExitInstance();
,b2O^tJF# //}}AFX_VIRTUAL
I&Eg-96@ //{{AFX_MSG(CHookApp)
IdQwLt // NOTE - the ClassWizard will add and remove member functions here.
"6[Ax{cM // DO NOT EDIT what you see in these blocks of generated code !
tZJ
9}\r //}}AFX_MSG
P /f ~ DECLARE_MESSAGE_MAP()
2Wc;hJ.1 };
gZ79u LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
kBDe*K.V BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\8C*O{w BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
eBLHT BOOL InitHotkey();
f|[5&,2< BOOL UnInit();
r* #endif
%_i0go,^ HzO0K=Z=R0 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
;M(ehX
#include "stdafx.h"
ND99g #include "hook.h"
+kdU%Sm #include <windowsx.h>
TF([yZO' #ifdef _DEBUG
sN[@mAoH #define new DEBUG_NEW
|L~gNC #undef THIS_FILE
={&TeMMA static char THIS_FILE[] = __FILE__;
.Q6{$Y%l #endif
:ayO+fr# #define MAX_KEY 100
,_X,V! #define CTRLBIT 0x04
4HYH\ey #define ALTBIT 0x02
b}q(YgH< #define SHIFTBIT 0x01
iM-hWhU #pragma data_seg("shareddata")
y&O_Jyg< HHOOK hHook =NULL;
c9_4ohB UINT nHookCount =0;
A_4\$NZ^ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Pq_ApUZa static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
tIp\MXkTQ& static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
YJtOdgG|q static int KeyCount =0;
^!s}2GcS` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
y^Xxa'y #pragma data_seg()
FL_ arhrqD HINSTANCE hins;
CB7R{~
$ void VerifyWindow();
=S?-=jPtg BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
zj$Z%|@$ //{{AFX_MSG_MAP(CHookApp)
P^{`d_[K% // NOTE - the ClassWizard will add and remove mapping macros here.
0aq-drl5\ // DO NOT EDIT what you see in these blocks of generated code!
g5TLX&Bd //}}AFX_MSG_MAP
E(K$|k_> END_MESSAGE_MAP()
{10+(Vl -B++V CHookApp::CHookApp()
F@*r%[S/ {
u/{_0-+P // TODO: add construction code here,
*~aI>7H // Place all significant initialization in InitInstance
$EHn;~w T }
qcoZ2VJ hh ',-X#u
CHookApp theApp;
W SeRV?+T LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
fJ+E46|4 {
nd9-3W BOOL bProcessed=FALSE;
X]qp~:4G if(HC_ACTION==nCode)
t"@|;uPAu {
%L,, if((lParam&0xc0000000)==0xc0000000){// Key up
9~ .BH;ku switch(wParam)
6b5{ {
U";Rp&\3; case VK_MENU:
hFF&(t2{^ MaskBits&=~ALTBIT;
dodz|5o% break;
!7Q.w/|= case VK_CONTROL:
G}OrpPP MaskBits&=~CTRLBIT;
O9 r44ww break;
P_}_D{G case VK_SHIFT:
kys-~&@+ MaskBits&=~SHIFTBIT;
+GEKg~/4e break;
rEyMSLN default: //judge the key and send message
YH6K-} break;
y"n~ET}e7 }
=$`")3y3 for(int index=0;index<MAX_KEY;index++){
.6]cu{K( if(hCallWnd[index]==NULL)
bJu,R-f continue;
[+2^n7R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_!T$|,a {
]?5@ObG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&]A1 _dy bProcessed=TRUE;
nFOG=>c} }
Lgw@y!Llij }
wH5O>4LO }
e5y`CXX else if((lParam&0xc000ffff)==1){ //Key down
NQ{Z switch(wParam)
6#-; ,2i {
o?x|y case VK_MENU:
l`G:@}P>G MaskBits|=ALTBIT;
r/w@Dh]{_ break;
YXOD
fd%L case VK_CONTROL:
D%}o26K.C MaskBits|=CTRLBIT;
Fgq*3t break;
Kct +QO( case VK_SHIFT:
sm <kb@g MaskBits|=SHIFTBIT;
o=5uM break;
Z%d4V<fn default: //judge the key and send message
)x $Vy= break;
{?_)m/\ }
xL#oP0d<e for(int index=0;index<MAX_KEY;index++)
u+I3VK_) {
nmAXU!t' if(hCallWnd[index]==NULL)
6:X\vw continue;
BuO J0$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
S;kc{? {
%zVv3p: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
DEuW' .o> bProcessed=TRUE;
PhdL@Mr }
UeTp, }
^W*)3;5 }
%Q01EjRes if(!bProcessed){
p#NZ\qJ for(int index=0;index<MAX_KEY;index++){
oMf h|B if(hCallWnd[index]==NULL)
;\0RXirk continue;
uU"s50m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
(S{c*"}2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
8zv6Mx }
AE~}^(G` }
?Cl"jcQ* }
7]53GGNO return CallNextHookEx( hHook, nCode, wParam, lParam );
b8Sl3F?-~ }
RGOwm~a <\NXCUqDpo BOOL InitHotkey()
|]^! 4[!U {
:RG6gvz if(hHook!=NULL){
eu/Sp3@v nHookCount++;
[X\2U4 return TRUE;
6d6SP)|j }
cE?J]5#^ else
I<f M8t.Y> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
`_kRvpi if(hHook!=NULL)
ax }Xsk_ nHookCount++;
53xq% return (hHook!=NULL);
Nzt1JHRS }
J>&GP#7} BOOL UnInit()
xEqrs6sR {
".=EAXVU if(nHookCount>1){
j'cS_R nHookCount--;
g Q^]/X return TRUE;
Er`PYE
J }
C\K-- BOOL unhooked = UnhookWindowsHookEx(hHook);
s6IuM )x if(unhooked==TRUE){
P@ u%{ nHookCount=0;
r6<}S( hHook=NULL;
cgAcAcmY }
'-qc\6UY return unhooked;
%kT:"j(xW }
2sH5<5G' nz+KA\iW BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
stScz#! {
4B
6Aw? BOOL bAdded=FALSE;
$fO*229As for(int index=0;index<MAX_KEY;index++){
FB`HwE< if(hCallWnd[index]==0){
A>k;o0r hCallWnd[index]=hWnd;
N:.bnF( HotKey[index]=cKey;
s.R(3}/ HotKeyMask[index]=cMask;
kzT' bAdded=TRUE;
gsAO<Fy KeyCount++;
WfVie6 break;
.[!
^L }
<Lt$qV-# }
;K!Or return bAdded;
D.~t#a A }
195(Kr<5$ `y(3:##p BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[0Sd +{Q {
g`1i[Iu2 BOOL bRemoved=FALSE;
uQlV zN.? for(int index=0;index<MAX_KEY;index++){
SF7Kb `>Y if(hCallWnd[index]==hWnd){
'1+ Bgf if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
SzDi=lY hCallWnd[index]=NULL;
Fei$94a HotKey[index]=0;
w~`P\i@ HotKeyMask[index]=0;
%9K@`v- bRemoved=TRUE;
D{mu2'q KeyCount--;
(~#9KA1A} break;
_cB~?c }
,3K?=e2 }
AMr 9rB d }
Z,z^[Jz return bRemoved;
U"Y$7~ }
PSE![whK l6~eb=u;9g void VerifyWindow()
k`d {
b#F3,T__`Y for(int i=0;i<MAX_KEY;i++){
[":x if(hCallWnd
!=NULL){ anbr3L[!
if(!IsWindow(hCallWnd)){ j'W)Nyw$[
hCallWnd=NULL; +hfl.OBy
HotKey=0; JGtdbD?Fw
HotKeyMask=0; cG<?AR?wDT
KeyCount--; `c icjA@~
} |G1U$p
} TM+7>a$
} xn-n{U"
} {MHr]A}X\
p(v.sP4w
BOOL CHookApp::InitInstance() qnOAIP:0
{ uW]n3)7<I
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?h{ &
hins=AfxGetInstanceHandle(); N;htKcZ
InitHotkey(); k,?k37%T]
return CWinApp::InitInstance(); d-Sm<XHu.
} TPrwC~\B/
8?PNyO-Wt5
int CHookApp::ExitInstance() az w8BK
{ xd*kNY
VerifyWindow(); 5yry$w$G)
UnInit(); $I_aHhKt
return CWinApp::ExitInstance(); D~-Ri`k.
} 6s6[sUf=l&
|')Z;
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4u<oe_n
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) hgm`6TQ
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q@2Smtu~c
#if _MSC_VER > 1000 NJ|8##Z>
#pragma once /V,:gLpQ
#endif // _MSC_VER > 1000 V< J~:b1V
hp)3@&T
class CCaptureDlg : public CDialog lOVsp#
{ "]sr4Jg=
// Construction . uhP(
public: >]Y`-*vw&
BOOL bTray; _KKG^
u<
BOOL bRegistered; |W?x6]~.R
BOOL RegisterHotkey(); -\>Xtix^-c
UCHAR cKey; "BK&C6]
UCHAR cMask; L='GsjF0}
void DeleteIcon(); Oq[tgmf
void AddIcon(); =E{1QA0
UINT nCount; PQ1\b-I
void SaveBmp(); [&e}@!8O`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor lrK5q
// Dialog Data m,'u_yK
//{{AFX_DATA(CCaptureDlg) uA,K}sNRZ
enum { IDD = IDD_CAPTURE_DIALOG }; 8USF;k
CComboBox m_Key; r6"t`M
BOOL m_bControl; -V(5U!^B
BOOL m_bAlt; i: 1V\q%
BOOL m_bShift; 7,Nd[
oL*7
CString m_Path; ;|66AIwDe
CString m_Number; w_6h
$"^x
//}}AFX_DATA |NL$? %I
// ClassWizard generated virtual function overrides =xg pr*
//{{AFX_VIRTUAL(CCaptureDlg) iGM-#{5
public: \=1k29O
virtual BOOL PreTranslateMessage(MSG* pMsg); {~ VgXkjsC
protected: ?NJ\l5'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F?3a22Zg#
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 'xhX\?mD
//}}AFX_VIRTUAL gFJd8#6t
// Implementation UfXqcyY(
protected: YaDr6)
HICON m_hIcon; [26"?};"%
// Generated message map functions Gw$U0 HA[,
//{{AFX_MSG(CCaptureDlg) cW%F%:b
virtual BOOL OnInitDialog(); qa2QS._m
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +!CG'qyN>
afx_msg void OnPaint(); uee2WGD
afx_msg HCURSOR OnQueryDragIcon(); XzkC ]e'
virtual void OnCancel(); _=}Efy7
afx_msg void OnAbout(); =T!iM2
afx_msg void OnBrowse(); 5'Y @c
afx_msg void OnChange(); >^{}Hjt
//}}AFX_MSG vA*!82
DECLARE_MESSAGE_MAP() {O[a+r.n
}; gM '_1zs
U
#endif KYZ/b8C
0PjWfM8%
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file P_
U[OM\
#include "stdafx.h" I5
"Z
#include "Capture.h" vm_+U*%c
#include "CaptureDlg.h" W^Wr
#include <windowsx.h> De6WC*trq
#pragma comment(lib,"hook.lib") cR*D)'/tl
#ifdef _DEBUG W c{<DE?J
#define new DEBUG_NEW 1.6yi];6
#undef THIS_FILE |L11?{ K
static char THIS_FILE[] = __FILE__; 7o-umZ}8
#endif F2saGpGH
#define IDM_SHELL WM_USER+1 gG!L#J?
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZBUEg7c
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |7LhE+E
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ZEYT17g]
class CAboutDlg : public CDialog pWa'Fd
{ <%Zg;]2H`
public: 9w9[0BX#
CAboutDlg(); MqDz cB]
// Dialog Data i7_Nv
//{{AFX_DATA(CAboutDlg) jdqVS @SD
enum { IDD = IDD_ABOUTBOX }; 7o_1PwKS6
//}}AFX_DATA '[Ap/:/UY
// ClassWizard generated virtual function overrides ;x^WPYEj
//{{AFX_VIRTUAL(CAboutDlg) % put=I
protected: ^cs:S-s
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S:aAR*<6
//}}AFX_VIRTUAL SaceIV%(
// Implementation @-qS[bV
protected: ZfsM($|a
//{{AFX_MSG(CAboutDlg) @TBcVHy
//}}AFX_MSG 33IJbg
DECLARE_MESSAGE_MAP() /
VypN,
}; ,j E'd'$
-5B>2K F
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) BPs|qb-
{ gT8Q:8f:
//{{AFX_DATA_INIT(CAboutDlg) V{4=,Ax
//}}AFX_DATA_INIT {| ~
} p)2
!_0
goBl~fqy0
void CAboutDlg::DoDataExchange(CDataExchange* pDX) qw?#~"Ca.
{ Ya~*e;CW2
CDialog::DoDataExchange(pDX); t~_vzG
//{{AFX_DATA_MAP(CAboutDlg) {;mT.[
//}}AFX_DATA_MAP 9bu}@#4*
} 0>{&8:
Xf
0)i
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jR1t&UD3Y
//{{AFX_MSG_MAP(CAboutDlg) VgGMlDl
// No message handlers ufl[sj%^|
//}}AFX_MSG_MAP ["O/%6b9+
END_MESSAGE_MAP() {o>51fXc)
/Q]6"nY
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @G'&7-(h*
: CDialog(CCaptureDlg::IDD, pParent) 6="Qwrk
{ [Ey[A|g
//{{AFX_DATA_INIT(CCaptureDlg) P'}WmE'B}F
m_bControl = FALSE; _EHz>DJ9
m_bAlt = FALSE; [7Fx#o=da
m_bShift = FALSE; B8Vhl:p
m_Path = _T("c:\\"); 96ydcJY0'
m_Number = _T("0 picture captured."); +>b m~6
nCount=0; '0b!lVe
bRegistered=FALSE; =:fN
bTray=FALSE; vC#_PI
//}}AFX_DATA_INIT 5z/*/F=X
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &JUHm_wd&S
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r ,cz
yE/
} yj$a0Rgkv
;r8<
Ed
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s8:-*VR9
{ #!.26RM:P
CDialog::DoDataExchange(pDX); Xmb001
//{{AFX_DATA_MAP(CCaptureDlg) vQH6CB"
DDX_Control(pDX, IDC_KEY, m_Key); LC>bZ!(i#
DDX_Check(pDX, IDC_CONTROL, m_bControl); simD<&p
DDX_Check(pDX, IDC_ALT, m_bAlt); Nh^
lC
DDX_Check(pDX, IDC_SHIFT, m_bShift); rd_!'pG
DDX_Text(pDX, IDC_PATH, m_Path); Sgp1p}
DDX_Text(pDX, IDC_NUMBER, m_Number); 3*(w=;y
//}}AFX_DATA_MAP n=F|bW
} @LyCP4
b}APD))*H!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) V|\dnVQ'-%
//{{AFX_MSG_MAP(CCaptureDlg) HuI?kLfj\
ON_WM_SYSCOMMAND() ?+P D?c7
ON_WM_PAINT() 'g5 Gdn
ON_WM_QUERYDRAGICON() c3__=$)'kP
ON_BN_CLICKED(ID_ABOUT, OnAbout) 0FAe5
BE7
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vk><S|[n
ON_BN_CLICKED(ID_CHANGE, OnChange) alp}p
//}}AFX_MSG_MAP L,\wB7t
END_MESSAGE_MAP() ,&F4|{
eAl;:0=%L
BOOL CCaptureDlg::OnInitDialog() <rn26Gfr
{ EEJ OJ<
CDialog::OnInitDialog(); WU+OS(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bXNM.K
ASSERT(IDM_ABOUTBOX < 0xF000); dCn'IM1
CMenu* pSysMenu = GetSystemMenu(FALSE); qdNt2SO
if (pSysMenu != NULL) UFl+|wf
{ 5H^"
CString strAboutMenu; \- f^C}m
strAboutMenu.LoadString(IDS_ABOUTBOX); Hx?OCGj=S*
if (!strAboutMenu.IsEmpty()) "i^<
H
{
Q!ReA{
pSysMenu->AppendMenu(MF_SEPARATOR); dWi:V7t+
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); MhL>6rn
} i_{b*o_an
} kSUpEV+/
SetIcon(m_hIcon, TRUE); // Set big icon igO,Ge8}
SetIcon(m_hIcon, FALSE); // Set small icon i"RBk%
m_Key.SetCurSel(0); D!WyT`T
RegisterHotkey(); e.'6q
($3
CMenu* pMenu=GetSystemMenu(FALSE); %1Nank!Zj
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [))TL
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Oe)B.{;Ph
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZcE:r+
return TRUE; // return TRUE unless you set the focus to a control _Squ%z:D
} ZW@%>_JR]
y!u=]BE
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) yKB&][)&
{ ~cH3RFV
if ((nID & 0xFFF0) == IDM_ABOUTBOX) `|`Qrv4}
{ $d\>^Q
CAboutDlg dlgAbout; E(-@F%Q
dlgAbout.DoModal(); UAEu.AT
} Hw1:zro
else ]9PQKC2&
{ |w+N(wcJ
CDialog::OnSysCommand(nID, lParam); ',bSJ4)Y
} tl"?AQcBR
} SUN!8
qFA
LK:J kjp^
void CCaptureDlg::OnPaint() %U?1Gf e
{ <5E: ,<
if (IsIconic()) JU3to_Io
{ =;(y5c
CPaintDC dc(this); // device context for painting $_f"NE}
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); B1i&HoGbz
// Center icon in client rectangle O6"S=o&
int cxIcon = GetSystemMetrics(SM_CXICON); /C
int cyIcon = GetSystemMetrics(SM_CYICON); *?3c2Jg=E
CRect rect; ?rxq//S2
GetClientRect(&rect); ZG$PW<73~
int x = (rect.Width() - cxIcon + 1) / 2; 1LVO0lT
int y = (rect.Height() - cyIcon + 1) / 2; uD4j.%
// Draw the icon s"JD,gm$
dc.DrawIcon(x, y, m_hIcon); brEA-xNWQ
} 1n!xsesSc
else 9A,ok[J
{ e#odr{2#4u
CDialog::OnPaint(); YhQ%S}
} v2jpao<K
} y$y!{R@
gP.PyYUV
HCURSOR CCaptureDlg::OnQueryDragIcon() ({0:1*lF@
{ B'&QLO|
return (HCURSOR) m_hIcon; @p<t JR"M
} 4o|<zn
3|(<]@
$
void CCaptureDlg::OnCancel() @!Rklhb
{ -dS@l'$
if(bTray) T#GTNk!v
DeleteIcon(); i:60|ngK
CDialog::OnCancel(); \b*z<Odv
} u{Gci
x|$|~6f=n
void CCaptureDlg::OnAbout() {s>V'+H(F
{ k}]M`ad
CAboutDlg dlg; =Q*x=}NH
dlg.DoModal(); tU0jFBB
} SQDfDrYP
IU;a$
void CCaptureDlg::OnBrowse() ..7"<"uH
{ Z&of-[)
CString str; I-^C6~
BROWSEINFO bi; C6'K)P[p
char name[MAX_PATH]; a}Z+"D
ZeroMemory(&bi,sizeof(BROWSEINFO)); h [@}}6
bi.hwndOwner=GetSafeHwnd(); Bo$dIn2_
bi.pszDisplayName=name; sa TS8p z
bi.lpszTitle="Select folder"; ERy=lP~gV
bi.ulFlags=BIF_RETURNONLYFSDIRS; HR;I}J 9
LPITEMIDLIST idl=SHBrowseForFolder(&bi); =~>g--^U
if(idl==NULL) _#qfe
return; /gn!="J
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); x\oSD1t,
str.ReleaseBuffer(); Zs4NN2~
m_Path=str; wjfq"7Q
if(str.GetAt(str.GetLength()-1)!='\\') Iz[ohn!f
m_Path+="\\"; 1obajN
UpdateData(FALSE); U C_$5~8p
} A*g-pJh
adPd}rt;
void CCaptureDlg::SaveBmp() R.cR:fA
{ aS``fE;O
CDC dc; =*R6O,
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 3l"8_zLP
CBitmap bm; THARr#1b};
int Width=GetSystemMetrics(SM_CXSCREEN); n(`|:h"
int Height=GetSystemMetrics(SM_CYSCREEN); d<6m_!L
bm.CreateCompatibleBitmap(&dc,Width,Height); %>$Puy\U
CDC tdc; A $i^/hJs
tdc.CreateCompatibleDC(&dc); 9F[_xe@
CBitmap*pOld=tdc.SelectObject(&bm); T.jCF~%7F
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [r!f&R
tdc.SelectObject(pOld);
kD0bdE|
BITMAP btm; #; f50j!r
bm.GetBitmap(&btm); H~^)^6)^T
DWORD size=btm.bmWidthBytes*btm.bmHeight; 9VanR
::XX
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \VA*3U^@
BITMAPINFOHEADER bih; QIg'js$W
bih.biBitCount=btm.bmBitsPixel; \Hdsy="Dnh
bih.biClrImportant=0; 91]sO%3
bih.biClrUsed=0; X`1R&K;z^
bih.biCompression=0; Y2;2Exp^
bih.biHeight=btm.bmHeight; I]DD5l}\
bih.biPlanes=1; s_a jA
bih.biSize=sizeof(BITMAPINFOHEADER); C}(@cn `L
bih.biSizeImage=size; UOk\fyD2[
bih.biWidth=btm.bmWidth; ~d].<Be
bih.biXPelsPerMeter=0; ,ryL("G
bih.biYPelsPerMeter=0; uovv">Uw
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #y[U2s Se
static int filecount=0; /M+Du,
CString name; !?v_.
name.Format("pict%04d.bmp",filecount++); zgH(/@P
name=m_Path+name; o+B)
BITMAPFILEHEADER bfh; ~USt&?
bfh.bfReserved1=bfh.bfReserved2=0; L7d1)mV
bfh.bfType=((WORD)('M'<< 8)|'B'); 9Msy=qvYG
bfh.bfSize=54+size; 1`YU9?
bfh.bfOffBits=54; *ziR &Fr!
CFile bf; /isalOT
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 'E+"N'M|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TN1pg
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
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bf.WriteHuge(lpData,size); R(`:~@3\6
bf.Close(); wapSpSt
nCount++; OQ7 `n<I<)
} |K"Q>V2y
GlobalFreePtr(lpData); :nQlS
if(nCount==1) ==& y9e
m_Number.Format("%d picture captured.",nCount); IHYLM;@L
else ATl?./T u
m_Number.Format("%d pictures captured.",nCount); xC,x_:R`
UpdateData(FALSE); ~Ix2O
} KWZhCS?[(
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) aPVzOBp
{ sVK?sBs]
if(pMsg -> message == WM_KEYDOWN) b7Jxv7$e
{ 8 {V9)U
if(pMsg -> wParam == VK_ESCAPE) z@i4
return TRUE; -}9^$}PR
if(pMsg -> wParam == VK_RETURN) ,VHqZ'6
return TRUE; )63
$,y-;$
} O=A2QykV(
return CDialog::PreTranslateMessage(pMsg); {d'-1z"q
} "FWx;65CR
\&5V';
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) I I+y
{ D &"D[|@
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ yGdX>h
SaveBmp(); +cfEyiub
return FALSE; A~2)ZdAN
} d_,5;M^k
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |QDoi[
*
CMenu pop; (Jk&U8y
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1)56ec<c
CMenu*pMenu=pop.GetSubMenu(0); YV<y-,Io
pMenu->SetDefaultItem(ID_EXITICON); kh5a >OX
CPoint pt; d+
jX49Vt
GetCursorPos(&pt); Uj):}xgi'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +?$J8Paf
if(id==ID_EXITICON) %.Ma_4o
Z
DeleteIcon(); #i[:oC6m:
else if(id==ID_EXIT) @-'a{hBR
OnCancel(); L"qJZU
return FALSE; tWIs
|n
} m2c'r3 UEu
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C#kE{Qw10r
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) d:@+dS
AddIcon(); !6KX^j-
return res; X
zJ#)}f
} ~U0%}Bbh
566!T_
void CCaptureDlg::AddIcon() K(EJ`2]:r
{ >}+{;d
NOTIFYICONDATA data; C/e.BXA
data.cbSize=sizeof(NOTIFYICONDATA); BNfj0e 5b
CString tip; 2n:<F9^"
tip.LoadString(IDS_ICONTIP); um.ZAS_kmc
data.hIcon=GetIcon(0); rwRZGd *p
data.hWnd=GetSafeHwnd(); ye^x>a['
strcpy(data.szTip,tip); !l (Vk
data.uCallbackMessage=IDM_SHELL; sbW+vc
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9>)b6)J D
data.uID=98; qGk.7wf%
Shell_NotifyIcon(NIM_ADD,&data); >)kKP8l7
ShowWindow(SW_HIDE); * Gg7(cnpw
bTray=TRUE; x?Abk
} AY AU
Kh]es,$D
void CCaptureDlg::DeleteIcon() (a[BvJf
{ WqeWjI.2
NOTIFYICONDATA data; p<mL%3s0
data.cbSize=sizeof(NOTIFYICONDATA); Jt_=aMY:7
data.hWnd=GetSafeHwnd(); $*C
}iJsF
data.uID=98; C4mkt2Eb0a
Shell_NotifyIcon(NIM_DELETE,&data); aTvyzr1
ShowWindow(SW_SHOW); !> sA.L&=
SetForegroundWindow(); U,WOP7z
ShowWindow(SW_SHOWNORMAL); 9xQ|Uad+%
bTray=FALSE; b~gq8,Fatb
} y\FQt];z)
Wg|6{'a
void CCaptureDlg::OnChange() J67
thTGFq
{ Et 0gPX-
RegisterHotkey(); 'V&g"Pb
} $H<_P'h-B
)G2Bx+Z;L
BOOL CCaptureDlg::RegisterHotkey() 6tH}K
{ dn h qg3Y
UpdateData(); b `P6Ox3
UCHAR mask=0; VzT*^PFBg
UCHAR key=0; OLG)D#m(4/
if(m_bControl) awzlLI<2p
mask|=4; C6e5*S
if(m_bAlt) MV5$e
mask|=2; W? G4>zA
if(m_bShift) +Z"Wa0wA
mask|=1; %w&+o.k/
key=Key_Table[m_Key.GetCurSel()]; Y1Ql_
if(bRegistered){ (#dR\Di
DeleteHotkey(GetSafeHwnd(),cKey,cMask); [r2V+b.C
bRegistered=FALSE; c44s@E
} {L$$"r,
cMask=mask; (cVIjo+::
cKey=key; nk!uO^
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ub?dfS9$_
return bRegistered; 5YrzOqg=
} :a8Sy("
61_PSScSY
四、小结 s(X\7Hz_nC
H ezbCwsx&
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。