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:
{Qlvj.Xw
rs 7R5 F 一、实现方法
&ATjDbW*( B>|@XfPM 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:
\u",bMQF !mq+Oz~ #pragma data_seg("shareddata")
a"#5JcR3 HHOOK hHook =NULL; //钩子句柄
DFqXZfjm UINT nHookCount =0; //挂接的程序数目
cp[4$lu static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
H[!by)H static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
m:X;dcq'3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
/38^N|/Zr static int KeyCount =0;
wArNWBM static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
M0"xDvQ #pragma data_seg()
0&c12W|B<L YadyRUE 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
{@B<$g /1o~x~g(b 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:
U,aV{qz Be0P[v BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
)[G5qTO cKey,UCHAR cMask)
Yl>@(tu)| {
f>l}y->-Ug BOOL bAdded=FALSE;
AqE . TK for(int index=0;index<MAX_KEY;index++){
:|N5fkhN if(hCallWnd[index]==0){
b.;F)( hCallWnd[index]=hWnd;
[fO \1J HotKey[index]=cKey;
n uhKM.a{ HotKeyMask[index]=cMask;
}3=]1jH6 bAdded=TRUE;
NC@OmSR\0 KeyCount++;
J?u@' "u break;
>g8Tl`P,iN }
kCLz@9>FQ }
$WrDZU 2z return bAdded;
f{k2sU*uBE }
BWfsk/lej //删除热键
?IGT !' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
yC6XO&:g {
4^ $ BOOL bRemoved=FALSE;
l;F3kA for(int index=0;index<MAX_KEY;index++){
'SvYZ0ot if(hCallWnd[index]==hWnd){
C!%BW%"R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&37QUdp+p hCallWnd[index]=NULL;
cZ%weQa#N) HotKey[index]=0;
*d?,i-Q.+ HotKeyMask[index]=0;
*siS4RX2 bRemoved=TRUE;
(lTM^3
} KeyCount--;
QJ-6aB break;
vfcj,1 }
Z&/bp 1 }
QV4{=1A }
\ C~Y return bRemoved;
kd9hz-* }
d7N}-nsB YeptYW@xfw _;L9&>!p6 DLL中的钩子函数如下:
^MKvZ DOP 9ZeTS~i LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
D CcM~ {
^e8~eL+ BOOL bProcessed=FALSE;
`SZ^~O if(HC_ACTION==nCode)
j%#n}H {
jf~/x>Q if((lParam&0xc0000000)==0xc0000000){// 有键松开
-[" .km switch(wParam)
XGbtmmQG {
yL7a*C& case VK_MENU:
CES^
c-. k MaskBits&=~ALTBIT;
jDqe)uVvtV break;
(kK6=Mrf case VK_CONTROL:
/RIvUC1 MaskBits&=~CTRLBIT;
J-au{eP^
break;
"z1\I\
^ case VK_SHIFT:
GxuFO5wz MaskBits&=~SHIFTBIT;
jyb/aov break;
Pp*|EW 1 default: //judge the key and send message
WIa4!\Ky! break;
`h+ sSIko }
&CV%+ for(int index=0;index<MAX_KEY;index++){
wm%9>mA% if(hCallWnd[index]==NULL)
nX7{09 continue;
am]$`7R5d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?;ZTJ {
g0:mm,t\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
n?
e&I>1W bProcessed=TRUE;
qfd/t<?|D }
)}0(7z
Yu }
4. 7m* }
_{_ybXG| else if((lParam&0xc000ffff)==1){ //有键按下
1(CpTaa switch(wParam)
Jlj=FA` {
/U4F\pZl case VK_MENU:
CE=&ZHt9 MaskBits|=ALTBIT;
K@)Hm\* break;
/59jkcA+ case VK_CONTROL:
Gg]>S#^3 MaskBits|=CTRLBIT;
n{s
`XyH break;
[y7BHikX) case VK_SHIFT:
!_3Rd S MaskBits|=SHIFTBIT;
a^hDxeG break;
l{[{pAm default: //judge the key and send message
-NHA{?6r break;
Mj&q"G }
T>7$<ulm for(int index=0;index<MAX_KEY;index++){
Q=}p
P* if(hCallWnd[index]==NULL)
5
?~
?8Hi continue;
d9^ uEz( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-aK_ {
5(W`{{AW SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
$p#)xx7 bProcessed=TRUE;
yr9%,wwN }
W3Oj6R }
u,mC`gz }
4D=p#KZ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
gXBC=
?jl for(int index=0;index<MAX_KEY;index++){
;7Cb!v1 if(hCallWnd[index]==NULL)
`md)|PSU continue;
+Wrj%}+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.Zv@iL5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Z7a~M3VnZ //lParam的意义可看MSDN中WM_KEYDOWN部分
"#anL8 }
UIPi<_Xa }
*8{PoD }
O~sv^ return CallNextHookEx( hHook, nCode, wParam, lParam );
G;#-CT }
BQmHYar CV&+^_j'k 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
s
~c_9,JK |3j'HN5S BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
\0?^%CD+@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
|)`<D MHar9)$} 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:
cBs:7Pnp% X%w` :c& LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1W*%}!&Gm {
VSns_>o if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Y%eFXYk. {
53=5xE= `D //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
QT)D|]bH SaveBmp();
~IrrX,mp: return FALSE;
H <7r }
<\40?*2 …… //其它处理及默认处理
pD;'uEFBQ }
CEbZj
z| mNhVLB )%H@.;cD_r 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。
c%,@O&o R{={7.As+ 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。
<=D!/7$O K`}8fU 二、编程步骤
www#.D%'U ffDh0mDN 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
nM]Sb|1: +$_.${uwV 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
}e[;~g\& W\f u0^ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
zb<YYJ] OAx5 LTd 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
`?@7T-v E&js`24 & 5、 添加代码,编译运行程序。
@q8h'@sX 4R<bfZ43 三、程序代码
y8~/EyY|^ dZ]['y% ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
e0rh~@E #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
abAX)R' #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
KYe@2 6
#if _MSC_VER > 1000
p@`]9tLP(K #pragma once
FZdZGK #endif // _MSC_VER > 1000
D=ZH? d #ifndef __AFXWIN_H__
m[l[yUw# #error include 'stdafx.h' before including this file for PCH
mQ~0cwo) #endif
YC,s]~[[ #include "resource.h" // main symbols
Q:rQ;/b0/ class CHookApp : public CWinApp
_d<xxF^q {
60R Yw9d%0 public:
T-.Q CHookApp();
O:G5n 5J // Overrides
AW[_k% // ClassWizard generated virtual function overrides
Ih RWa|{I //{{AFX_VIRTUAL(CHookApp)
<d`ksZ+ public:
qhE1
7Hf virtual BOOL InitInstance();
o'#ow(X virtual int ExitInstance();
<4{Jm8zJ //}}AFX_VIRTUAL
c}$C=s5 h} //{{AFX_MSG(CHookApp)
coG_bX?e // NOTE - the ClassWizard will add and remove member functions here.
a%FM)/oI|T // DO NOT EDIT what you see in these blocks of generated code !
0-VC$)S //}}AFX_MSG
Y:;]qoF DECLARE_MESSAGE_MAP()
|:[
[w&R };
IXA3G7$) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
B:?MMXB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
; fOkR+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
NA`qC.K BOOL InitHotkey();
3$TU2-x;g BOOL UnInit();
0UbY0sYo #endif
#.KVT#%~{ ;kE|Vx //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
B)!ty" #include "stdafx.h"
3 *g>kRMJ #include "hook.h"
f[wA]& #include <windowsx.h>
Q)lN7oD #ifdef _DEBUG
mBtXa|PJ #define new DEBUG_NEW
.5s#JL #undef THIS_FILE
q$ZmR]p static char THIS_FILE[] = __FILE__;
x@aWvrL #endif
Zb? u'Vm=u #define MAX_KEY 100
tjId?}\ #define CTRLBIT 0x04
QGq8r> #define ALTBIT 0x02
a7~%( L@r #define SHIFTBIT 0x01
s+fjQo4 #pragma data_seg("shareddata")
dm(Xy'*iQ HHOOK hHook =NULL;
K6BP~@H_D UINT nHookCount =0;
g##yR/L static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
o1k
X` Eu static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
:4\=xGiY static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
y'
r I1eF static int KeyCount =0;
4S7#B static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
S
A\_U::T #pragma data_seg()
qRbU@o.3 HINSTANCE hins;
4DTT/ER'qA void VerifyWindow();
WBd$#V3 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
uH.1'bR?a //{{AFX_MSG_MAP(CHookApp)
?LAiSg=eq // NOTE - the ClassWizard will add and remove mapping macros here.
6o
cTQ}= // DO NOT EDIT what you see in these blocks of generated code!
.Xm?tC< //}}AFX_MSG_MAP
K'@lXA: END_MESSAGE_MAP()
~c\iBk 3!*qB-d CHookApp::CHookApp()
J=`2{
'l {
FPC^-mD // TODO: add construction code here,
Hgk@I; // Place all significant initialization in InitInstance
;i>(r;ZM }
tso\bxiU ]fdxpqz CHookApp theApp;
;JHR~ TV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
zu!# {
K @h94Ni6 BOOL bProcessed=FALSE;
.`TDpi9OB if(HC_ACTION==nCode)
mr[+\
5 {
}Nc Ed; if((lParam&0xc0000000)==0xc0000000){// Key up
? `+G0VT switch(wParam)
9cJ1J7y {
S0]JeP+3! case VK_MENU:
|e+r|i] MaskBits&=~ALTBIT;
JE=3V^k break;
d&owS+B{48 case VK_CONTROL:
/V"6Q'D MaskBits&=~CTRLBIT;
$a.,;: break;
<KEVA?0> case VK_SHIFT:
1Pp2wpD4iC MaskBits&=~SHIFTBIT;
?#obNQ"u] break;
fpA%:V default: //judge the key and send message
o
@(.4+2m break;
m.b}A'GT }
\<kQ::o1y for(int index=0;index<MAX_KEY;index++){
ph~d%/^jI if(hCallWnd[index]==NULL)
3DX@ggE2 continue;
4SNDKFw if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#DkdFy
%` {
s*9lYk0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
mrGfu:r bProcessed=TRUE;
>MLPmER }
h{/lW#[ }
ur|
vh5 }
R\Of , else if((lParam&0xc000ffff)==1){ //Key down
r-'CB switch(wParam)
Y$<p_X, {
QnH;+k
ln case VK_MENU:
0wpGIT!2 MaskBits|=ALTBIT;
o56UlN break;
iu.$P-s case VK_CONTROL:
Zk<Y+! MaskBits|=CTRLBIT;
8k9q@FSln break;
k*e$_ case VK_SHIFT:
]uZaj?%J< MaskBits|=SHIFTBIT;
M}\p/r= break;
K]H [A, default: //judge the key and send message
m;oCi}fL break;
=DsFR9IB }
ohlCuH3 for(int index=0;index<MAX_KEY;index++)
QqCwyK0 {
Z1N=tL if(hCallWnd[index]==NULL)
<o"2z~gv continue;
2=`}:&0l if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
t+IrQf,P[ {
E!
mxa SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%j.
*YvveW bProcessed=TRUE;
#QM9!k@9k }
=j^wa') }
#``Alh8 }
g=Bge) if(!bProcessed){
y*vg9`$k for(int index=0;index<MAX_KEY;index++){
Y5R|)x if(hCallWnd[index]==NULL)
]\6*2E{1m continue;
/:+MUw7~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z"$huE>P6 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
[ n2)6B\/ }
4Pkl()\c }
WJBwo%J }
dCO7"/IHW return CallNextHookEx( hHook, nCode, wParam, lParam );
,#8H9<O9t }
.-?Txkwb x#jJ
0T BOOL InitHotkey()
`^'0__<M {
3!Ca b/T if(hHook!=NULL){
ot;
]?M nHookCount++;
SS7C|*-Zd return TRUE;
$m[*)0/ }
aSH =|Jnc else
K'zBDrkW-x hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
ZeE(gtM if(hHook!=NULL)
M2piJ'T4u nHookCount++;
W&p f%? return (hHook!=NULL);
!+Zso& }
sUN9E4 BOOL UnInit()
XEb+Z7L 1 {
T&u25"QOf if(nHookCount>1){
6r }w nHookCount--;
?V$@2vBVX4 return TRUE;
:r+F95e }
J 7]LMw7 BOOL unhooked = UnhookWindowsHookEx(hHook);
K?gO]T{6 if(unhooked==TRUE){
Z/+H nHookCount=0;
22gh,e2o hHook=NULL;
{PS|q? }
\$Aw[
5&t return unhooked;
f@H>by
N }
M6:$ 0(r @i=_y+|d_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
uE^5o\To {
Ie'iAY BOOL bAdded=FALSE;
jFGY`9Zw0 for(int index=0;index<MAX_KEY;index++){
Z1sRLkR^ if(hCallWnd[index]==0){
l^;=0UR_ hCallWnd[index]=hWnd;
A}MF>.!}C HotKey[index]=cKey;
8
_|"+Ze HotKeyMask[index]=cMask;
A"Sp7M[J bAdded=TRUE;
R~N'5#.*M KeyCount++;
4$Ud4< break;
2,e>gP\] }
z2god 1" }
91:TE8?Z return bAdded;
Pw/$
}Q9X }
yPT\9"/ mJa8;X!r6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*ez7Q {
Mq4>Mu BOOL bRemoved=FALSE;
YnW,6U['{g for(int index=0;index<MAX_KEY;index++){
eDL0Vw if(hCallWnd[index]==hWnd){
g#r,u5<*? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~vstuRRST hCallWnd[index]=NULL;
41^
$ HotKey[index]=0;
Ep8 y HotKeyMask[index]=0;
MURHv3 bRemoved=TRUE;
Z.3*sp0
yv KeyCount--;
$##LSTA break;
X,ok 3c4X }
"xp>Vj }
P;[>TCs ]8 }
AN4(]_] return bRemoved;
LT6VZ,S }
K?H(jP2mpM 1SY3 void VerifyWindow()
DPylc9[- {
-14~f)%NQ* for(int i=0;i<MAX_KEY;i++){
m}GEx)Y D if(hCallWnd
!=NULL){ +YnQOh%v0s
if(!IsWindow(hCallWnd)){ BTa#}LBZ+
hCallWnd=NULL; &d&nsQ
HotKey=0; N7}yU~j^
HotKeyMask=0; 'jjJ[16"d
KeyCount--; ?v$1Fc55
} [A46WF>L
} [K#pU:lTH
} @2R+?2 j
} 4KZ)`KPE
&8@
a"
BOOL CHookApp::InitInstance() ErY-`8U"
{ f$]ttU U
AFX_MANAGE_STATE(AfxGetStaticModuleState()); </33>Fu)
hins=AfxGetInstanceHandle(); ( Y)a`[B
InitHotkey(); n_1,-(t
return CWinApp::InitInstance(); :my@Oxx4@
} cDqj&:$e
66MWOrr
int CHookApp::ExitInstance() .tt= \R
{ Su/}OS\R
VerifyWindow(); THHA~;00YN
UnInit(); w$FN(BfA
return CWinApp::ExitInstance(); >&l{_b\k
}
UVaz,bXla
0uO<7IW9
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ky0,#ZOF
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *D;VZs0O
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \aB"D=P\ok
#if _MSC_VER > 1000 <n)R?P(or
#pragma once H <ugc
#endif // _MSC_VER > 1000 e3x;(@j
73tWeZ8rvx
class CCaptureDlg : public CDialog NK|m7(
{ *tL1t\jY
// Construction o!}/&
'(
public: q.69<Rs
BOOL bTray; V SUz+W
BOOL bRegistered; 2~q(?wY
BOOL RegisterHotkey(); R4Si{J*O
UCHAR cKey; i*ji
UCHAR cMask; ?Qdp#K]WX
void DeleteIcon(); ]WZi +
void AddIcon(); .}DL%E`n
UINT nCount; ~.f[K{h8
void SaveBmp(); Q2K)Nl >_
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 31n|ScXv
// Dialog Data eKek~U&
//{{AFX_DATA(CCaptureDlg) "i/3m'<2
enum { IDD = IDD_CAPTURE_DIALOG }; s&~.";b
CComboBox m_Key; d&5GkD.P
BOOL m_bControl; B)L;ja
BOOL m_bAlt; Dd$CN&Ca
BOOL m_bShift; Oky9GC.a
CString m_Path; 0fU^
CString m_Number; X]AbBzy
//}}AFX_DATA } P/
x@N
// ClassWizard generated virtual function overrides R22P
ol
//{{AFX_VIRTUAL(CCaptureDlg) U&<w{cuA
public: }doJ=lc
virtual BOOL PreTranslateMessage(MSG* pMsg); =OU]<%
protected: XqK\'8]\Mw
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /e4#DH
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &4-rDR,
//}}AFX_VIRTUAL 7z4u?>pne*
// Implementation 6N]V.;0_5
protected: rCFTch"
HICON m_hIcon; x:WxEw>R
// Generated message map functions ?L~Z]+-
//{{AFX_MSG(CCaptureDlg) 1q(o3%
virtual BOOL OnInitDialog(); y6!Zt}m
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0&|,HK
afx_msg void OnPaint(); "J (.dg]"
afx_msg HCURSOR OnQueryDragIcon(); *) ?Fo
virtual void OnCancel(); ?5#=Mh#
afx_msg void OnAbout(); 7+^4v(s
afx_msg void OnBrowse(); b1`(f"&l
afx_msg void OnChange(); 4<QSot
//}}AFX_MSG lg!{?xM
DECLARE_MESSAGE_MAP() l#G }j^Q
}; #3o]Qo[Sc
#endif 13:0%IO
kVu-,OU
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B)`^/^7
#include "stdafx.h" &.t|&8-
#include "Capture.h" ;Z(~;D
#include "CaptureDlg.h" KV$J*B Y
#include <windowsx.h> ViG4tb
#pragma comment(lib,"hook.lib") M`kR2NCi
#ifdef _DEBUG 'L0{Ed+9
#define new DEBUG_NEW *|DIG{
#undef THIS_FILE `nDgwp:b"
static char THIS_FILE[] = __FILE__; 1*Ui=M4
#endif >{]mN5
#define IDM_SHELL WM_USER+1 qg;fh]j%
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %<Q?|}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Bz#K_S
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 63?fn~0\
class CAboutDlg : public CDialog MJ:>ZRXCE
{ :,^pL At
public: 2o5v{W
CAboutDlg(); uKZe"wN;
// Dialog Data #Ua+P(1q
//{{AFX_DATA(CAboutDlg) ,lly=OhKb
enum { IDD = IDD_ABOUTBOX }; e!(0y)*
//}}AFX_DATA fC4D#
// ClassWizard generated virtual function overrides @|^2 +K/
//{{AFX_VIRTUAL(CAboutDlg) \Ow-o0
protected: :
*Nvy={c
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hA81(JWG
//}}AFX_VIRTUAL r&|-6OQZZ
// Implementation VIxt;yE
protected: kGZ_/"iuO
//{{AFX_MSG(CAboutDlg) (]mh}=:KDg
//}}AFX_MSG *0,?QS-a
DECLARE_MESSAGE_MAP() B R-(@
}; )2P4EEs[
6QOdd6_d
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )A4WK+yD$z
{ zaVDe9B,7
//{{AFX_DATA_INIT(CAboutDlg) |ei?s1)
//}}AFX_DATA_INIT `[;b#.
} 6_wf $(im
$MmCh&V
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .qioEqK8!y
{ ReCmv/AE
CDialog::DoDataExchange(pDX); d&p]O
//{{AFX_DATA_MAP(CAboutDlg) !m#cneV
//}}AFX_DATA_MAP 'sL>U$(
} a9q68
wO y1i/oj
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $3!j1
//{{AFX_MSG_MAP(CAboutDlg) Aghcjy|j
// No message handlers ul e]eRAG
//}}AFX_MSG_MAP q(Y<cJ?X
END_MESSAGE_MAP() ~{[~ =~\u
ogX'3L
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 4><b3r;T'
: CDialog(CCaptureDlg::IDD, pParent) )CzWq}:
{ PomX@N}1
//{{AFX_DATA_INIT(CCaptureDlg) 6?0^U 9
m_bControl = FALSE; K'%,dn
m_bAlt = FALSE; rSD!u0c[
m_bShift = FALSE; %3i/PIN
m_Path = _T("c:\\"); .6[xX?i^T
m_Number = _T("0 picture captured."); =>hq0F4[;
nCount=0; WG;1[o&
bRegistered=FALSE; ?'K}bmdt}.
bTray=FALSE; ^ZFbp@#U
//}}AFX_DATA_INIT ~4wbIE_rN
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;C%D+"l1g
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ZbYwuyHk(3
} @\_tS H
}`$:3mb&f
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) aho;HM$hjP
{ C9/?B:
CDialog::DoDataExchange(pDX); 8kih81tx"U
//{{AFX_DATA_MAP(CCaptureDlg) qphN
DDX_Control(pDX, IDC_KEY, m_Key); DsqsMlB{
DDX_Check(pDX, IDC_CONTROL, m_bControl); `
BH8v
DDX_Check(pDX, IDC_ALT, m_bAlt); -uiZp !
DDX_Check(pDX, IDC_SHIFT, m_bShift); Ou;
]>FJ
DDX_Text(pDX, IDC_PATH, m_Path); XQ<2(}]4
DDX_Text(pDX, IDC_NUMBER, m_Number); `OnN12`
//}}AFX_DATA_MAP xyx.1o
e!
} | zj$p~
YizJT0$
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9o P8| <+
//{{AFX_MSG_MAP(CCaptureDlg) J?-"]s`J
ON_WM_SYSCOMMAND() F]W'spF,
ON_WM_PAINT() sb_>D`>
ON_WM_QUERYDRAGICON() `-4c}T
ON_BN_CLICKED(ID_ABOUT, OnAbout) HB\y [:E
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WZRrqrjq
ON_BN_CLICKED(ID_CHANGE, OnChange) pN&Dpz^
//}}AFX_MSG_MAP g!7/iKj:
END_MESSAGE_MAP() KMznl=LF
(@O F
Wc"p
BOOL CCaptureDlg::OnInitDialog() Y.@
vdW
{ !a3cEzs3
CDialog::OnInitDialog(); ]}F_nc2L
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Tn/
3`j
{
ASSERT(IDM_ABOUTBOX < 0xF000); K3?7Hndf2
CMenu* pSysMenu = GetSystemMenu(FALSE); QQ97BP7W
if (pSysMenu != NULL) > K,Q`sS
{ K(Otgp+zb
CString strAboutMenu; C$)#s{*
strAboutMenu.LoadString(IDS_ABOUTBOX); pq>"GEN
if (!strAboutMenu.IsEmpty()) anA>' 63
{ -zHJ#
pSysMenu->AppendMenu(MF_SEPARATOR); PF@<>NO+W
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lcvWx%/o@
} l{aXX[E&1
} ;,Sl+)@h
SetIcon(m_hIcon, TRUE); // Set big icon ?D\6CsNp(2
SetIcon(m_hIcon, FALSE); // Set small icon VbK| VON[
m_Key.SetCurSel(0); }MrRsvN
RegisterHotkey(); S'V0c%'QQV
CMenu* pMenu=GetSystemMenu(FALSE); DI**fywu[3
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9wC q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @y9_\mX!s
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %|o4 U0c
return TRUE; // return TRUE unless you set the focus to a control *gu~7&yoP
} L]kSj$A
`#2}[D
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2#ha Icm"
{ rayC1#f
if ((nID & 0xFFF0) == IDM_ABOUTBOX) }9>W41
{ 9pStArF?F0
CAboutDlg dlgAbout; =4/lJm``
dlgAbout.DoModal(); I9ubV cV8
} >! wX%QHH
else &K)c*'l
{ {Rjj
CDialog::OnSysCommand(nID, lParam); [1dlV/
} RMmDcvM"k
} #
o)a`,f
N4}/n
void CCaptureDlg::OnPaint() Z|uUE
{ >I8R[@
if (IsIconic()) ?^2(|t9KU
{ n'1pNL:
CPaintDC dc(this); // device context for painting xgL*O>l)
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); @1gX>!
// Center icon in client rectangle U9IN# ;W
int cxIcon = GetSystemMetrics(SM_CXICON); Cz
Jze
int cyIcon = GetSystemMetrics(SM_CYICON); me$7\B;wy
CRect rect; :^1 Xfc"
GetClientRect(&rect); jUZ84Gm{
int x = (rect.Width() - cxIcon + 1) / 2; P$N\o @
int y = (rect.Height() - cyIcon + 1) / 2; RXb+"/
// Draw the icon %IW=[D6Tg
dc.DrawIcon(x, y, m_hIcon); &voyEvX/S
} {*`qL0u]^
else 3uz@JY"mK
{ 3rTYe6q$U
CDialog::OnPaint(); eL#pS=
} 'F?T4
}
5pI2G
HzF
HCURSOR CCaptureDlg::OnQueryDragIcon() X&TTw/J!^
{ w=s:eM@
return (HCURSOR) m_hIcon; ?^Q!=W<7
} |jk"; h
bf-.SX~
void CCaptureDlg::OnCancel() &o=
#P2Qd
{ 5<GC
if(bTray) - ~T LI&[
DeleteIcon(); 7d]}BLpjWz
CDialog::OnCancel(); :xm,Ok
} ga?.7F
>jME
== U0
void CCaptureDlg::OnAbout() ux& WN ,
{ vp1IYW
CAboutDlg dlg; s6lo11
dlg.DoModal(); xD,BlDV
} "b8<C>wY
vtK Qv Q
void CCaptureDlg::OnBrowse() `-"2(Gp
{ "Up3W%]SB
CString str; T+9#P4
BROWSEINFO bi; 0g,;Yzm
char name[MAX_PATH]; cclx$)X1X
ZeroMemory(&bi,sizeof(BROWSEINFO)); d0"Hu^]
bi.hwndOwner=GetSafeHwnd(); %]h5\%@w
bi.pszDisplayName=name; !<Ma9%uC{
bi.lpszTitle="Select folder"; 2)Grl;T]s
bi.ulFlags=BIF_RETURNONLYFSDIRS; uwXquOw
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q35$GFj"jD
if(idl==NULL) Waj6.PCFm
return; X&8&NkH
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); oa? bOm
str.ReleaseBuffer(); <xKer<D
%
m_Path=str; 3~;LNi
if(str.GetAt(str.GetLength()-1)!='\\') -uIu-a]
m_Path+="\\"; 3'}(:X(
UpdateData(FALSE); "9jt2@<
} aJ}y|+Cj
k(pI5N}pJZ
void CCaptureDlg::SaveBmp() X+z!?W*a
{ g'ha7~w(p
CDC dc; s3>,%8O6
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]+<[D2f
CBitmap bm; R?b3G4~
int Width=GetSystemMetrics(SM_CXSCREEN); 1N{}G$'Go
int Height=GetSystemMetrics(SM_CYSCREEN); 5 >S#ew
bm.CreateCompatibleBitmap(&dc,Width,Height); =&;orP
CDC tdc; ]B/Gz
tdc.CreateCompatibleDC(&dc);
s!X@ l
CBitmap*pOld=tdc.SelectObject(&bm); 0?8O9i
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <^c?M[j
tdc.SelectObject(pOld); y[:\kI
BITMAP btm; 9=O`?$y
bm.GetBitmap(&btm); l=ehoyER
DWORD size=btm.bmWidthBytes*btm.bmHeight; ~[l6;bn
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fb3(9
BITMAPINFOHEADER bih; cVYDO*N2T
bih.biBitCount=btm.bmBitsPixel; >?aPXC
bih.biClrImportant=0; {AUhF}O
bih.biClrUsed=0; mSF>~D1_
bih.biCompression=0; VW: WB.K$
bih.biHeight=btm.bmHeight; Q>Voa&tYn
bih.biPlanes=1; .<%2ON_
bih.biSize=sizeof(BITMAPINFOHEADER); ^aYlu0Wm
bih.biSizeImage=size; ?~X*\
bih.biWidth=btm.bmWidth; vik A
bih.biXPelsPerMeter=0; ;rXkU9
bih.biYPelsPerMeter=0; R?MRRq
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); E
w#UlA:"v
static int filecount=0; 44C"Pl
E
u
CString name; }N[|2nR'
name.Format("pict%04d.bmp",filecount++); r@b M3V_o
name=m_Path+name;
mo+zq~,M
BITMAPFILEHEADER bfh; v|fA)Ww
bfh.bfReserved1=bfh.bfReserved2=0; `G7LM55
bfh.bfType=((WORD)('M'<< 8)|'B'); ]^j:}#R
bfh.bfSize=54+size; wX5Yo{
bfh.bfOffBits=54; 2[!#Xf
CFile bf; Bn:"qN~
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ J<hqF4z
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ZeM~13[
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [d
30mVM
bf.WriteHuge(lpData,size); Sggha~E2s
bf.Close(); KZrg4TEVi
nCount++; a,mG5bQ!
}
r&
GlobalFreePtr(lpData); 5:y\ejU
if(nCount==1) S:2M9nC
m_Number.Format("%d picture captured.",nCount); _=0%3Sh
else )45~YDS;t
m_Number.Format("%d pictures captured.",nCount); }
DQ<YF+
UpdateData(FALSE); ?+Gc.lU
} 1<|\df.
-KV)1kET
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) sNB*S{
{ vd<r}3i*
if(pMsg -> message == WM_KEYDOWN) X!H[/b:1O
{ @jh\yj rW
if(pMsg -> wParam == VK_ESCAPE) ]JDKoA{S0
return TRUE; K^32nQX
if(pMsg -> wParam == VK_RETURN) 5i71@?q;
return TRUE; PL"u^G`
} TwPpZ@
return CDialog::PreTranslateMessage(pMsg); D)shWJRlvW
} wavyREK
03N|@Tu
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C_>
WU
{ mq#8[D
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *<r\:g
SaveBmp(); P+ejyl,
return FALSE; #h=pU/R
} a|}v?z\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N"/J1
CMenu pop; Pgug!![
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `U4e]Qh/+
CMenu*pMenu=pop.GetSubMenu(0); {7d(B1[1
pMenu->SetDefaultItem(ID_EXITICON); <S[]VXy
CPoint pt; BjX*Gm6l
GetCursorPos(&pt); ,4W~CkLD
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %u=b_4K"j
if(id==ID_EXITICON) kPRG^Ox8e
DeleteIcon(); 6&oaxAp<s
else if(id==ID_EXIT) <Wrn/%tL
OnCancel(); I{nrOb1G(
return FALSE; q,;8Ka )
} S?Y%}
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Gx)U~L$B
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =;L44.,g
AddIcon(); ,I|3.4z
return res; bi{G
:xt
} o|7ztpr
~K$dQb])
void CCaptureDlg::AddIcon() 3M^s
EaUI
{ >DM^/EAG{
NOTIFYICONDATA data; a~*wZJ
data.cbSize=sizeof(NOTIFYICONDATA); .@KI,_X6,
CString tip; oaac.7.fV
tip.LoadString(IDS_ICONTIP); .n\j<Kq
data.hIcon=GetIcon(0); 6uS;H]nd<
data.hWnd=GetSafeHwnd(); ,vDSY N6
strcpy(data.szTip,tip); /Fj*sS8
data.uCallbackMessage=IDM_SHELL; 8*x/NaH
/\
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; '_q&~M{
data.uID=98; t~v_k\`{
Shell_NotifyIcon(NIM_ADD,&data); E$"`|Df
ShowWindow(SW_HIDE); Sdzl[K/}
bTray=TRUE; 0{^ 0>H0
} qtR/K=^i
)U|0vr8:
void CCaptureDlg::DeleteIcon() ~o8
{ `g}po%k
NOTIFYICONDATA data; @|2sF
data.cbSize=sizeof(NOTIFYICONDATA); '"m-kor
data.hWnd=GetSafeHwnd(); f]4j7K!e]
data.uID=98; r }S>t~p:
Shell_NotifyIcon(NIM_DELETE,&data); j^5VmG
ShowWindow(SW_SHOW); byJR6f
SetForegroundWindow(); mYx6JU*`
ShowWindow(SW_SHOWNORMAL); b[U;P=;=
bTray=FALSE; B;64(Vsa8
} 2}uSrA7n]
2rGg
void CCaptureDlg::OnChange() 4k_y;$4WN
{ % <1&\5f<5
RegisterHotkey(); cj;k{Moc
} a7U`/*
Oh=E!
BOOL CCaptureDlg::RegisterHotkey() *<ILSZ
{ d-{1>\-_
UpdateData(); s&d!+-\6_
UCHAR mask=0; wbQs>pc
UCHAR key=0; _aP2gH
if(m_bControl) ~ugyUpY"
mask|=4; aY8QYK ;?^
if(m_bAlt) 0'Uo3jAB
mask|=2; [;Y*f,UG_-
if(m_bShift) ruU &.mZ
mask|=1; $tqr+1P
key=Key_Table[m_Key.GetCurSel()]; _T.T[%-&=
if(bRegistered){ ;9;jUQ]MyG
DeleteHotkey(GetSafeHwnd(),cKey,cMask); bLsN?_jy
bRegistered=FALSE; 7pO/!Lm
} 6f*QUw~
cMask=mask; nV/;yl4e{
cKey=key; m;cgX#k5
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +JejnG0
return bRegistered; Ake$M^Bz
} Yln[ZmK9g
!NO)|N>
四、小结 @bIZ0tr4
bLSUF`-z
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。