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:
J'sVT{@GS
2v0lWO~c7z 一、实现方法
lCr BXiuVx 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:
JVD#wwic B-
N #pragma data_seg("shareddata")
AA:Ch? HHOOK hHook =NULL; //钩子句柄
6!
\a8q'z UINT nHookCount =0; //挂接的程序数目
_S7GkpoK static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
~Yv"= static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
t
\kI( G static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
w4<RV:Vmt static int KeyCount =0;
XsQ?&xK=u static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
l}&egq
DC #pragma data_seg()
n9B1NM5 \ jFZJ #'CNS 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。
.Vj;[p8 3+;]dqZ 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:
v<,?%(g)7 ~vy_~|6s BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
CL5u{i5 cKey,UCHAR cMask)
cfyN)#9 {
iEux`CcJ. BOOL bAdded=FALSE;
=5a~xlBjD for(int index=0;index<MAX_KEY;index++){
L&+XFntR if(hCallWnd[index]==0){
d}GO( hCallWnd[index]=hWnd;
'=EaZ>= HotKey[index]=cKey;
H1N_ HotKeyMask[index]=cMask;
Edj}\e*-J bAdded=TRUE;
s(q\!\FS KeyCount++;
V/j+Z1ZW break;
<v&>&;>3 }
R;,+0r^i }
}rz}>((ZHF return bAdded;
7Co
}4 }
{aqceg //删除热键
6 :K~w<mMJ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
I9h?Z&n5 {
3rhH0{ BOOL bRemoved=FALSE;
/[`bPKr for(int index=0;index<MAX_KEY;index++){
i|0H {q if(hCallWnd[index]==hWnd){
7_)'Re# if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
CS"2Sd 1` hCallWnd[index]=NULL;
y+\nj3v6 HotKey[index]=0;
@[D-2s HotKeyMask[index]=0;
eVL'Ao&Ho bRemoved=TRUE;
a]|P rjPI KeyCount--;
`So*\#\T break;
`{s:lf }
_V^^%$ }
3N|,c]| }
/!rH DcR return bRemoved;
x>m_ v }
#8z2>&:| yeqZPzn W6_/FkO DLL中的钩子函数如下:
(0g@Z`r YQxVeS( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
sqFMO+ {
";AM3 BOOL bProcessed=FALSE;
LRW7_XYz if(HC_ACTION==nCode)
(?Fz{ {
yxh8sAZ if((lParam&0xc0000000)==0xc0000000){// 有键松开
O+A/thI%*S switch(wParam)
TXD\i Dq {
n,SD JsS^ case VK_MENU:
JL45!+ MaskBits&=~ALTBIT;
T},Nqt< break;
"l6v[yv case VK_CONTROL:
xG@zy4 MaskBits&=~CTRLBIT;
[vV]lWOp' break;
C
vfm ,BL case VK_SHIFT:
dp\pkx7 MaskBits&=~SHIFTBIT;
WDNuR#J? break;
=t\HtAXn[ default: //judge the key and send message
$q);xs break;
w0(A7L:L }
xH#R_ for(int index=0;index<MAX_KEY;index++){
N
'2Nv if(hCallWnd[index]==NULL)
pwU
l&hwte continue;
7'\<\oT
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
g+|1khS) {
fl*]ua SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
7'uuc]\5> bProcessed=TRUE;
}a6tG }
JK34pm[s }
7KXc9:p+ }
>xb}AY; else if((lParam&0xc000ffff)==1){ //有键按下
>/k[6r5 switch(wParam)
c,-3+b {
o Mk6ZzZ,> case VK_MENU:
:t+XW`eQR: MaskBits|=ALTBIT;
MgyV{` break;
AAUFX/}8P case VK_CONTROL:
A
J<Sa= MaskBits|=CTRLBIT;
PRcW}"m]Qg break;
%H Pwu & case VK_SHIFT:
~fbFA?g3 MaskBits|=SHIFTBIT;
^u`1W^> break;
+ pTc2z default: //judge the key and send message
w}nc^6qH break;
M|nTO }
Ze_4MwCW for(int index=0;index<MAX_KEY;index++){
N#
$ob9 if(hCallWnd[index]==NULL)
:23w[vt= continue;
".Z|zt6C if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
aGY R:jR$ {
(
`T;nz SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
#m[R1G# bProcessed=TRUE;
s>hNwb/ }
PoTJ4z }
6wK>SW)#&j }
g93-2k, if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
L,6v!9@ for(int index=0;index<MAX_KEY;index++){
eK[8$1 if(hCallWnd[index]==NULL)
`5,46_ continue;
b8Gu<Q1k if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
r&6X|2@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
C.`C T7 //lParam的意义可看MSDN中WM_KEYDOWN部分
\2F{r<A\@ }
NbnahhS }
"X<vgM^: }
6 z(7l return CallNextHookEx( hHook, nCode, wParam, lParam );
ObJgJr }
%<c2jvn+k mX2i^.zH 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
! f!/~M"! L[;U
Z)V@ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2loy4f BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
h$]=z\= l12Pj02 w 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:
+P YX. mcbvB5U LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
W6STjtT3P {
((OQs. if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/o@6?UH {
W.u+R?a= //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
xv|?;Zf6w SaveBmp();
x~3N})T5 return FALSE;
;\1/4;m }
aTXmF1_n …… //其它处理及默认处理
nX
4WlH }
!V/Vy/'`* ~^Ceru"< mmSC0F 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。
$=&a0O# oY)xXx 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。
$aIq>vJO9 c:? tn 二、编程步骤
02+ k,xFb [{R^!Az&b< 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
*nZe|)m b2rlj6d 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?fv5KdD Fl8*dXG& 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
I?y!d
G C1/qiSHsh 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Y
1v9sMN, bxU 2.YC 5、 添加代码,编译运行程序。
f7&53yZF 5D9n>K4| 三、程序代码
yE+Wb[H[ `4GEq2% ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
^LAP*R #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
NJ%>|`FEi7 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
o;w5;TkY #if _MSC_VER > 1000
!Q/oj
Q #pragma once
U1oZ\Mh #endif // _MSC_VER > 1000
,hO*W-a%1 #ifndef __AFXWIN_H__
^~dBO%M^ #error include 'stdafx.h' before including this file for PCH
UQ[!k 6 #endif
7dxe03h #include "resource.h" // main symbols
ohLM9mc9 class CHookApp : public CWinApp
,#/%Fn%T {
)-jA4!& public:
>oD,wSYV~ CHookApp();
10gh4,z[ // Overrides
X%>nvp // ClassWizard generated virtual function overrides
-q&K9ZCl` //{{AFX_VIRTUAL(CHookApp)
dUvgFOy|P public:
G+5_I"`W virtual BOOL InitInstance();
JCe%;U virtual int ExitInstance();
^$>Q6.x?*) //}}AFX_VIRTUAL
[:Upn)9 //{{AFX_MSG(CHookApp)
0eMO`8u[A // NOTE - the ClassWizard will add and remove member functions here.
;*J_V/&? // DO NOT EDIT what you see in these blocks of generated code !
VWLqJd>tr1 //}}AFX_MSG
Yee%
<<S DECLARE_MESSAGE_MAP()
)c6t`SBwi };
@XJzM]*w& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
p+.xye U( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
I-glf?F) BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
x^sSAI( BOOL InitHotkey();
eE=}^6)(* BOOL UnInit();
A r=P;6J #endif
ZBY*C;[)*P vz~`M9^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
]cmq #include "stdafx.h"
Y|
dw>qO #include "hook.h"
fo$s9g^< #include <windowsx.h>
D*_Z"q_B #ifdef _DEBUG
&eA!h #define new DEBUG_NEW
r*F^8_YMK #undef THIS_FILE
+sY8<y@% static char THIS_FILE[] = __FILE__;
6 d;_} #endif
4{v?<x8 #define MAX_KEY 100
6?`3zdOeO #define CTRLBIT 0x04
O-3R#sZ0 #define ALTBIT 0x02
)i^+=TZ q #define SHIFTBIT 0x01
Jc=~BT_G #pragma data_seg("shareddata")
vB?(| HHOOK hHook =NULL;
v?@=WG UINT nHookCount =0;
Zws[C static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
8MZ:= static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
S Boi| static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
0F5QAR
O static int KeyCount =0;
,5XDH6L1 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
-J&
b~t@ #pragma data_seg()
W Te1E, M HINSTANCE hins;
AqZ()p*z void VerifyWindow();
)x<oRHx] BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
hy}n&h //{{AFX_MSG_MAP(CHookApp)
n/ CP2A // NOTE - the ClassWizard will add and remove mapping macros here.
SHA6;y+U/~ // DO NOT EDIT what you see in these blocks of generated code!
[QZ8M@Gty# //}}AFX_MSG_MAP
p=T6Ix'_2e END_MESSAGE_MAP()
BD_"w]bqD IW>\\&pJ CHookApp::CHookApp()
8ioxb`U {
Ib}~Q@?2 // TODO: add construction code here,
IM(=j // Place all significant initialization in InitInstance
S-7ryHH*0 }
_(_U= By;{Y[@rS CHookApp theApp;
.
g8WMm LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
zI&). {
k:yrh:JhB BOOL bProcessed=FALSE;
Rq[VP# if(HC_ACTION==nCode)
B*;PF {
U|jip1\ if((lParam&0xc0000000)==0xc0000000){// Key up
H1or,>GoO switch(wParam)
+ab#2~,) {
#I-qL/Lm case VK_MENU:
E]gy5y MaskBits&=~ALTBIT;
krSOS WJ break;
dXMO{*MF{H case VK_CONTROL:
"8R\!i. MaskBits&=~CTRLBIT;
knABlU break;
5M=
S7B3= case VK_SHIFT:
s $?u'}G3 MaskBits&=~SHIFTBIT;
)J(@e4;Rv break;
=vD}O@tN default: //judge the key and send message
$.Qu55=z< break;
3;er.SFu{ }
a
IgV"3 for(int index=0;index<MAX_KEY;index++){
btDPP k' if(hCallWnd[index]==NULL)
B@K =^77 continue;
0N`'a?x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cHw-; {
nK>D& S_! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
r34 GO1d bProcessed=TRUE;
Wg[ThaZ }
w<me(!-' }
<;q)V%IUz }
gMB/ ~g5b0 else if((lParam&0xc000ffff)==1){ //Key down
PESJ7/^E switch(wParam)
Y}hz UKJ {
hB1Gtc4n case VK_MENU:
FZ@8&T
MaskBits|=ALTBIT;
G_5E#{u break;
LT:*K!>NOL case VK_CONTROL:
x67,3CLy? MaskBits|=CTRLBIT;
'qlWDt/ break;
gVpp9VB case VK_SHIFT:
8
huB<^ MaskBits|=SHIFTBIT;
v>'mW break;
gH[lpRu|7 default: //judge the key and send message
-FW'i10\2+ break;
nOdAp4{:q% }
vy{YGT for(int index=0;index<MAX_KEY;index++)
9 Xx4,#? {
S+M:{<AR if(hCallWnd[index]==NULL)
n||!/u)* continue;
QMBV"E_aY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3@^b's'S|} {
,}HnS)+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
L~} 2&w bProcessed=TRUE;
:}[[G2|9 }
TM$Ek^fQ. }
mqv!"rk'w }
I3D#wXW if(!bProcessed){
S$%Y{ for(int index=0;index<MAX_KEY;index++){
ba"a!#wA if(hCallWnd[index]==NULL)
nyr)d%I{ continue;
1`I#4f if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+Heen3 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
^
^R4%C }
n 7m! }
o](nK5? }
i \u"+:j return CallNextHookEx( hHook, nCode, wParam, lParam );
d$*SVd: }
}RY&f4&GV, J6*B=PX=( BOOL InitHotkey()
Ykt(%2L {
<B=!ZC=n if(hHook!=NULL){
jHWJpm( nHookCount++;
_<P~'IN+n return TRUE;
a FrVP }
xrky5[XoD else
^><B5A>; hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,O}2LaK.O if(hHook!=NULL)
YcJ2Arml nHookCount++;
hR3Pa'/i return (hHook!=NULL);
0CS80
pC }
^jMo?Zwy BOOL UnInit()
#$(wfb9 {
DozC> if(nHookCount>1){
M"$TXXe nHookCount--;
;r
XhK$ return TRUE;
%D:5 S?{ }
Ch9A6?=Hj8 BOOL unhooked = UnhookWindowsHookEx(hHook);
q{t"=@lX01 if(unhooked==TRUE){
hhvP*a_J nHookCount=0;
-!p-nk@9| hHook=NULL;
p; ZEz<M }
Q|W!m0XO return unhooked;
:j m|) }
JI}p{yI hT<:)MG)+K BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CJNz J( {
3tTz$$-# BOOL bAdded=FALSE;
QU{\ClW/? for(int index=0;index<MAX_KEY;index++){
Pf]O'G&F if(hCallWnd[index]==0){
4MOA}FZ~ hCallWnd[index]=hWnd;
,.+"10=N. HotKey[index]=cKey;
TAu*lL(F HotKeyMask[index]=cMask;
Ev\kq>2O bAdded=TRUE;
K-}'Fiq KeyCount++;
tFd^5A* break;
6}6ky9 }
]m(5>h# }
T\h_8 return bAdded;
v1j]&3O }
>MIp r 'D4KaM.d BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
SEXLi8;/ {
i#~1|2 BOOL bRemoved=FALSE;
~Zd n#z\ for(int index=0;index<MAX_KEY;index++){
r,4V SyZF\ if(hCallWnd[index]==hWnd){
x6x6N&f? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
^Y:Q%?uB/ hCallWnd[index]=NULL;
sE8.,\ HotKey[index]=0;
Pk; 9\0k7 HotKeyMask[index]=0;
K,IPVjS bRemoved=TRUE;
p3eJFg$ KeyCount--;
ZN ?P4#ZS break;
uGQCW\!"4 }
:6z0Ep" }
BVC{Zq6hi }
Fq5);sX= return bRemoved;
0OMyE9jJJ }
[]Z| *+=Q qt}[M|Q^r void VerifyWindow()
yf=ek== {
9e Dji, for(int i=0;i<MAX_KEY;i++){
>P=xzg79 if(hCallWnd
!=NULL){ TJB0O]@3
if(!IsWindow(hCallWnd)){ 'Sc3~lm(dH
hCallWnd=NULL; GfQP@R"
HotKey=0; /j'We-C
HotKeyMask=0; ZtEHP`Iin
KeyCount--; HC8{);
} ZX.VzZS
} !+M H?A
} 6iFd[<.*j
} b['TRYc=:
,9#G/nF
BOOL CHookApp::InitInstance() k-
sbZL
{ " I@Z:[=2
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^U_B>0`ch
hins=AfxGetInstanceHandle(); $XI5fa4Tt
InitHotkey(); pKMf#)qm
return CWinApp::InitInstance(); 7@vcQv
kC
} *k'9 %'<
@ec QVk
int CHookApp::ExitInstance() r\[HR ^`
{ )M]4p6Y
VerifyWindow(); BsB}noN}
UnInit(); U&Ay3/
return CWinApp::ExitInstance(); \+MR`\|3
} y Ht63z8'
0{PK]qp7
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file d<6L&8)<
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _uHyE }d
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kQIWDN
#if _MSC_VER > 1000 fINM$ 6
#pragma once cx2s|@u0
#endif // _MSC_VER > 1000 ~9oS~fP?I
$vy.BYFm
class CCaptureDlg : public CDialog #OWwg`AWv
{ ~ilbW|s?=k
// Construction (p14{
public: `s:| 4;.
BOOL bTray; .(S,dG0P
BOOL bRegistered; /p>"|z
BOOL RegisterHotkey(); ~N'KIP[W
UCHAR cKey; XE$eHx3;
UCHAR cMask; e`$v\7K
void DeleteIcon(); 3<+l.Wly
void AddIcon(); :M3l#`4Q
UINT nCount; r 'jVF'w
void SaveBmp(); _n}!1(xYa`
CCaptureDlg(CWnd* pParent = NULL); // standard constructor b9y
E
// Dialog Data K?T)9
//{{AFX_DATA(CCaptureDlg) '*3+'>
enum { IDD = IDD_CAPTURE_DIALOG }; iMp)g%Ng
CComboBox m_Key; 2
yP#:T/z
BOOL m_bControl; Y\p
yl
BOOL m_bAlt; Lp
]d4"L;3
BOOL m_bShift; ~82jL%-u
CString m_Path; (rwbF
CString m_Number; +Kq>r|;
//}}AFX_DATA h'-TZXs0e1
// ClassWizard generated virtual function overrides 2|%30i,vV
//{{AFX_VIRTUAL(CCaptureDlg) ;*Z
w}51
public: Y5MHd>m
virtual BOOL PreTranslateMessage(MSG* pMsg); m'qMcCE
protected: ^m1Rw|
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .X2mEnh
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !)9zH
//}}AFX_VIRTUAL L8j,?u#
// Implementation C}1(@$
protected: iD(K*[;lc
HICON m_hIcon; #Y18z5vo
// Generated message map functions z|b4w7I
//{{AFX_MSG(CCaptureDlg) 6PMu;#
virtual BOOL OnInitDialog(); y
ph
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ldX]A#d.
afx_msg void OnPaint(); E?XA/z !
afx_msg HCURSOR OnQueryDragIcon(); v}_$9&|S
virtual void OnCancel(); E>g'!
afx_msg void OnAbout(); zWY6D4
afx_msg void OnBrowse(); D!mhR?t
afx_msg void OnChange(); 4_"ZSVq]#
//}}AFX_MSG B)-S@.u
DECLARE_MESSAGE_MAP() T]vD ,I+
}; '[-/Xa['
#endif _>`0!mG
yQx>h6
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;:!LAe
#include "stdafx.h" 2hpx%H
#include "Capture.h" 9xKFX|*$
#include "CaptureDlg.h" f(_qcgXp
#include <windowsx.h> 1Xs!ew)>
#pragma comment(lib,"hook.lib") U50X`J
#ifdef _DEBUG .Nf*Yqs0
#define new DEBUG_NEW +'Ge?(E4_
#undef THIS_FILE <K0lS;@K
static char THIS_FILE[] = __FILE__; wM&G-~9ujk
#endif fzKKK+
#define IDM_SHELL WM_USER+1 YT:1=Nf}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c"z%AzUV'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9/%|#b-z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rb_G0/R
class CAboutDlg : public CDialog ZE\t{s0
{ _N]yI0k(
public: ,H%\+yn{
CAboutDlg(); eQLa .0
// Dialog Data =_1" d$S&
//{{AFX_DATA(CAboutDlg) ld?M,Qd
enum { IDD = IDD_ABOUTBOX }; JIQzP?+?
//}}AFX_DATA O:x=yj%^
// ClassWizard generated virtual function overrides 4Ek<
5s[
//{{AFX_VIRTUAL(CAboutDlg) YW}/C wB
protected: 95<:-?4C;W
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RTU:J67E
//}}AFX_VIRTUAL S;c=6@"
// Implementation M)xK+f2_[
protected: )b7mzDp(
//{{AFX_MSG(CAboutDlg) dG rA18
//}}AFX_MSG ='JX_U`A^F
DECLARE_MESSAGE_MAP() *=
71/&B
}; z]WT>4
+ mcN6/
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2
g8PU$T
{ oD 8-I^
//{{AFX_DATA_INIT(CAboutDlg) 5cADC`q
//}}AFX_DATA_INIT %x *f{(8h
}
@3@%9E
;F+%{LgKl
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .Sn1YAhE
{ f65Sr"qB3
CDialog::DoDataExchange(pDX); D[r
//{{AFX_DATA_MAP(CAboutDlg) J91`wA&r
//}}AFX_DATA_MAP :d#NnR0^L
} Kaa*;T![
=,'Z6?%p
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gMvvDP!Wp
//{{AFX_MSG_MAP(CAboutDlg) lrE0)B5F
// No message handlers M,@SUu v"
//}}AFX_MSG_MAP O92Y d$S
END_MESSAGE_MAP() !+6l.`2WI
0%t|?@HoN
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xH0/R LK3J
: CDialog(CCaptureDlg::IDD, pParent) 3q>"#+R.t
{ ,*4"d._Y
//{{AFX_DATA_INIT(CCaptureDlg) NLpD,q{
m_bControl = FALSE; c5;ROnTm
m_bAlt = FALSE; $>UzXhf}\
m_bShift = FALSE; Jc)1}
m_Path = _T("c:\\"); XJ\q!{;h
m_Number = _T("0 picture captured."); 5Z[D(z
nCount=0; r &[~/m8zl
bRegistered=FALSE; EyeLC6u
bTray=FALSE; T82_`u
//}}AFX_DATA_INIT YZ>cE#
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W% [5~N
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O, {
(
} #J!?
:(m:
O>GP>U?]
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Rv-o__C!
{ 39j d}]e
CDialog::DoDataExchange(pDX); q{hq. KZ
//{{AFX_DATA_MAP(CCaptureDlg) $T4PC5.
DDX_Control(pDX, IDC_KEY, m_Key); .+|DN"PgJ
DDX_Check(pDX, IDC_CONTROL, m_bControl); O2G+
'
DDX_Check(pDX, IDC_ALT, m_bAlt); K9 q~Vf
DDX_Check(pDX, IDC_SHIFT, m_bShift); ^sKXn:)
DDX_Text(pDX, IDC_PATH, m_Path); MUrY >FYgx
DDX_Text(pDX, IDC_NUMBER, m_Number); Lk9>7xY
//}}AFX_DATA_MAP 'dzp@-\
} L@Z
&v'A
B<LavX>F
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %&XX*&
q
//{{AFX_MSG_MAP(CCaptureDlg) kTz
ON_WM_SYSCOMMAND() oc(bcU
ON_WM_PAINT() rd))H
ON_WM_QUERYDRAGICON() WGmCQE[/c
ON_BN_CLICKED(ID_ABOUT, OnAbout) o zYI/b^
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Pb,^UFa=
ON_BN_CLICKED(ID_CHANGE, OnChange) o,yvi
//}}AFX_MSG_MAP yLx.*I^6
END_MESSAGE_MAP() [q&J"dt
c)8wO=!
BOOL CCaptureDlg::OnInitDialog() Ic
K=E]p
{ LXLDu2/@
CDialog::OnInitDialog(); 2YKM9Ks
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7gwZ9Fob
ASSERT(IDM_ABOUTBOX < 0xF000); 1l_}O1
CMenu* pSysMenu = GetSystemMenu(FALSE); -G;1U
if (pSysMenu != NULL) ,#T3OA!c**
{ F4x7;?W{*
CString strAboutMenu; ]3xa{h~4
strAboutMenu.LoadString(IDS_ABOUTBOX); =]a@)6y
if (!strAboutMenu.IsEmpty()) %7#Zb '
{ d_uy;-3
pSysMenu->AppendMenu(MF_SEPARATOR); *u/|NU&X
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); wIF
":'
} !5j3gr~
} #P#R~b]
SetIcon(m_hIcon, TRUE); // Set big icon [bG>qe1}&
SetIcon(m_hIcon, FALSE); // Set small icon $O'2oeM
m_Key.SetCurSel(0); *fSM' q;
RegisterHotkey(); SN(=e#ljE
CMenu* pMenu=GetSystemMenu(FALSE); noA\5&hqW
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )6&\WNL-x
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); pT@!O}'$
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \&5@ yh
return TRUE; // return TRUE unless you set the focus to a control LG#w/).^
} P|4E1O
]$*{<
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1H=wl=K
{ e@=[+iJc
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 7omGg~!k(
{ i4n
b#
CAboutDlg dlgAbout; Oq,.Kz
dlgAbout.DoModal(); s jI[Vq
} /K) b0QX
else yZp:hs#
{ nnL$m_K~
CDialog::OnSysCommand(nID, lParam); oks=|'&
} Qz+d[%Q}x
} jF{gDK
;j U-<
void CCaptureDlg::OnPaint() -]\E}Ti
{ df6Ν4L
if (IsIconic()) xzl4v=7
{ Czr4
-#2
CPaintDC dc(this); // device context for painting MLBg_<
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); kA%OF*%|6
// Center icon in client rectangle .k`*$1?73x
int cxIcon = GetSystemMetrics(SM_CXICON); s2?,' es
int cyIcon = GetSystemMetrics(SM_CYICON); }c4E 2c
CRect rect; : .o=F`W
GetClientRect(&rect); =jIT"rk
int x = (rect.Width() - cxIcon + 1) / 2; V`,[=u?c
int y = (rect.Height() - cyIcon + 1) / 2; n>:c}QAJH
// Draw the icon 8EG8!,\I
dc.DrawIcon(x, y, m_hIcon); Cw[Od"B\?U
} 9/daRq$
else hcd>A vC8
{ (1SO;8k\
CDialog::OnPaint(); _8li4;F
} 5**5b9bj-9
} d]ZC8<`w
*{dD'9Bg
HCURSOR CCaptureDlg::OnQueryDragIcon() d50IAa^p6J
{ M.:@<S
return (HCURSOR) m_hIcon; `s83rhs`!
} d =(Yl r
$^=jPk]+
void CCaptureDlg::OnCancel() RA/ =w&
{ 8U<.16+5Q
if(bTray) mXU?+G0
DeleteIcon(); aI{@]hCo
CDialog::OnCancel(); KPjqw{gR_R
} xUo)_P\_
3TiXYH
void CCaptureDlg::OnAbout() 7
Mki?EG
{ b6!Q!:GO&
CAboutDlg dlg; J4Z<Yt/
dlg.DoModal(); j+13H+dN
} Fm$n@RbX
L2>?m`wp
void CCaptureDlg::OnBrowse() VIz{}_~'s
{ y>7VxX0xi
CString str; <Xs@ \
BROWSEINFO bi; bOxjm`B<
char name[MAX_PATH]; W_BAb+$aF
ZeroMemory(&bi,sizeof(BROWSEINFO)); (#-=y~%
bi.hwndOwner=GetSafeHwnd(); /[|}rqX(
bi.pszDisplayName=name; GATP
bi.lpszTitle="Select folder"; )|Vg/S
bi.ulFlags=BIF_RETURNONLYFSDIRS; ;%rs{XO9
LPITEMIDLIST idl=SHBrowseForFolder(&bi); oX2DFgz
if(idl==NULL) XuFm4DEJ
return; +<!)k?
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "`jZ(+
str.ReleaseBuffer();
krr-ZiK
m_Path=str; @8M'<tr<z
if(str.GetAt(str.GetLength()-1)!='\\') |P. =
m_Path+="\\"; F@_Egi
UpdateData(FALSE); ;H
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} E%k ]cZ
`FYtiv?G
void CCaptureDlg::SaveBmp() Ng."+&
{ o^_W $4Fc
CDC dc; L^5&GcHP0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); @}&,W
N%
CBitmap bm; 3d#9Wyxs
int Width=GetSystemMetrics(SM_CXSCREEN); U=c5zrs
int Height=GetSystemMetrics(SM_CYSCREEN); ^b"x|8
bm.CreateCompatibleBitmap(&dc,Width,Height); OP|.I._I
CDC tdc; xyS2_Q
tdc.CreateCompatibleDC(&dc); 8V=HyF#
CBitmap*pOld=tdc.SelectObject(&bm); v E3{H
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !X\sQNp
tdc.SelectObject(pOld); KMpDlit
BITMAP btm; np`gcj#
bm.GetBitmap(&btm); k5fH;
DWORD size=btm.bmWidthBytes*btm.bmHeight; f0cYvL]
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }P&1s,S8J#
BITMAPINFOHEADER bih; *C3uMiz
bih.biBitCount=btm.bmBitsPixel; oz\{9Lwc
bih.biClrImportant=0; 1F3QI|
bih.biClrUsed=0; A{i][1N
bih.biCompression=0; U9@t?j_#X{
bih.biHeight=btm.bmHeight; Lem\UD$D`
bih.biPlanes=1; (:&&;]sI
bih.biSize=sizeof(BITMAPINFOHEADER); (b`4&sQ<
bih.biSizeImage=size; |i}+t
bih.biWidth=btm.bmWidth; \]f5
bih.biXPelsPerMeter=0; mJGO)u&
bih.biYPelsPerMeter=0; >%n8W>^^4
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -~(0O
static int filecount=0; gfdPx:7^
CString name; t3
uB
name.Format("pict%04d.bmp",filecount++); [Q7->Wo|S:
name=m_Path+name; k lP{yxU'n
BITMAPFILEHEADER bfh; xI`Uk8- 8
bfh.bfReserved1=bfh.bfReserved2=0; rnMG0
bfh.bfType=((WORD)('M'<< 8)|'B'); %S
>xSqX
bfh.bfSize=54+size; _ bXVg3oDt
bfh.bfOffBits=54; k\mXo-:V6
CFile bf; xP{HjONu
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ u
n?j
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1kvPiV=X>
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 3ZW/$KP/
bf.WriteHuge(lpData,size); nJldz;
bf.Close(); z^ aCQ3E
nCount++; hkmTpH1<M
} r+[#%%}ea
GlobalFreePtr(lpData); Pg*?[^*
if(nCount==1) abTDa6 /`v
m_Number.Format("%d picture captured.",nCount); |aI|yq)
else IL+#ynC
m_Number.Format("%d pictures captured.",nCount); XI%RneuDr:
UpdateData(FALSE); +X* F<6mZ
} ' D)1ka.
K)Df}fVOc
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) KA|&Q<<{@
{ 27Kc-rcB
if(pMsg -> message == WM_KEYDOWN) zK'
_e&*
{ 3i]"#wK
if(pMsg -> wParam == VK_ESCAPE) ~h>rskJ_
return TRUE; m6bWmGnGC
if(pMsg -> wParam == VK_RETURN) .KT 7le<Zm
return TRUE; hV3,^#9o
} 'WKu0Yi^'
return CDialog::PreTranslateMessage(pMsg); "B|nh d
} dxzvPgi?
26\HV
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /gqqKUx
{ ]Wy^VcqX
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ql{^"8x
SaveBmp(); =R8f)UQYx
return FALSE; (ZE%tbm2
} CbTf"pl
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Qag|nLoT
CMenu pop; ,GdxUld
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); E<D+)A
CMenu*pMenu=pop.GetSubMenu(0); u4Y6B
]Q
pMenu->SetDefaultItem(ID_EXITICON); )^jQkfL
CPoint pt; ~=`f]IL
GetCursorPos(&pt); [ E$$nNs
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zVp[YOS&c
if(id==ID_EXITICON) jGk7=}nw
DeleteIcon(); ^#a#<8Jz
else if(id==ID_EXIT) VRtbHam
OnCancel(); &%|xc{i
return FALSE; i;[h
9=\/
} x\Nhix}1D
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D 7Gd%
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) f0-RhR
AddIcon(); &q," !:L]
return res; +L`V[;
} B8bvp:Ho|
iyA*JCD
void CCaptureDlg::AddIcon() 4/*]`
{ Ep^B,;~
NOTIFYICONDATA data; Kwy1SyU
data.cbSize=sizeof(NOTIFYICONDATA); 3q'K5}
_
CString tip; +O|_P`HBoI
tip.LoadString(IDS_ICONTIP); ]}nu9z<
data.hIcon=GetIcon(0); v
t^r1j
data.hWnd=GetSafeHwnd(); EHH|4;P6
strcpy(data.szTip,tip); IT8B~I\OY
data.uCallbackMessage=IDM_SHELL; QT`fix{
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pu\b`3C(
data.uID=98; 68vxI|EZ
Shell_NotifyIcon(NIM_ADD,&data); ?~F]@2)5w
ShowWindow(SW_HIDE); 2"T8^r|U
bTray=TRUE; 98D{{j92
} X?KGb{
k)$iK2I
void CCaptureDlg::DeleteIcon() IL!BPFG w
{ `y1BTe&
NOTIFYICONDATA data; aj&\CJ
data.cbSize=sizeof(NOTIFYICONDATA); CMC?R,d
data.hWnd=GetSafeHwnd(); h=X7,2/<
data.uID=98; @Djs[Cs<*
Shell_NotifyIcon(NIM_DELETE,&data); 1t0bUf;(M
ShowWindow(SW_SHOW); }R`8h&J
SetForegroundWindow(); ! a86iHU
ShowWindow(SW_SHOWNORMAL); =L:[cIRrT;
bTray=FALSE; <2n'}&F
} Wl,%&H2S<
I'x$,s
void CCaptureDlg::OnChange() Q<z)q<e
{ *
zd.
RegisterHotkey(); ,)Yao;Cvd
} 5?^]1P_
0w^jls
BOOL CCaptureDlg::RegisterHotkey() I|$'Q$m~
{ WEno+Z~=1'
UpdateData(); %0NL Rfp
UCHAR mask=0; B#J{ F
UCHAR key=0; $`E4m8fX
if(m_bControl) V78Mq:7d
mask|=4; x*:n4FZ7b
if(m_bAlt) P1dN32H
o
mask|=2; !?yxh/>lM
if(m_bShift) gs$3)t
mask|=1; _Mlhumt
key=Key_Table[m_Key.GetCurSel()]; x2Ha&
if(bRegistered){ aZ8h[#]7
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?(]a*~rx
bRegistered=FALSE; l#b:^3
} Vz%"9`r
cMask=mask; )8:n}w
cKey=key; #]"/{Z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 55LgBD
return bRegistered; N0]z/}hd@
} B<A:_'g
O ,l\e3;
四、小结 &u&2D$K,tp
}K?F7cD
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。