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:
{aGQ[MH\9
]_d(YHYf 一、实现方法
=!U{vT `U2PlCf| 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:
/nb(F h|{T 4mshB #pragma data_seg("shareddata")
+;Cq>1x, HHOOK hHook =NULL; //钩子句柄
PwF}yxkI UINT nHookCount =0; //挂接的程序数目
Ng'f u| static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
b44H2A. static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
>P\Tnb"Q\ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
FX}<F0([? static int KeyCount =0;
}xLwv=Ia static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*}ay #pragma data_seg()
SwC,=S *sAoYx 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。
xhUQ.(S`r6 jJ55Az?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:
v
bb mmv CG=#rc]vz BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
eqeVz` cKey,UCHAR cMask)
]P(Eo|)m {
4LBjqv,P BOOL bAdded=FALSE;
BqR;d for(int index=0;index<MAX_KEY;index++){
l,6="5t if(hCallWnd[index]==0){
1)u=&t,
hCallWnd[index]=hWnd;
)/
s9ty HotKey[index]=cKey;
r+m8#uR HotKeyMask[index]=cMask;
q n =6>wP bAdded=TRUE;
VrF]X#\) KeyCount++;
`Yoafa break;
He#+zE; }
_<t3~{qUT }
YLPiK return bAdded;
|8+<qgQ }
@D0Ut9) //删除热键
iY;)R|6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ucoBeNsHx {
Kwh3SU=L} BOOL bRemoved=FALSE;
(5km]`7z for(int index=0;index<MAX_KEY;index++){
'd(}bYr) if(hCallWnd[index]==hWnd){
cB -XmX/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
-.^Mt.) hCallWnd[index]=NULL;
%NeKDE HotKey[index]=0;
!Toq~,a8? HotKeyMask[index]=0;
zc/S bRemoved=TRUE;
i.F[.-. KeyCount--;
Z]9
)1& break;
Ij=hmTl{P }
Cc!n`%qc }
O "{o
( }
c%xxsq2n return bRemoved;
B Am{Gb }
&]#D`u j:<E=[Kl tQ`tHe DLL中的钩子函数如下:
[W^6=7EO -(:BkA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5fVdtJk7 {
?:U6MjlQ"{ BOOL bProcessed=FALSE;
3c9v~5og4 if(HC_ACTION==nCode)
&2QN^)q {
m{b(^K9} if((lParam&0xc0000000)==0xc0000000){// 有键松开
I9Z8]Q+2" switch(wParam)
ge[\% {
rTmcP23] case VK_MENU:
@Ki`g(],P MaskBits&=~ALTBIT;
>St break;
bzUc;&WDz case VK_CONTROL:
YJ3970c/M MaskBits&=~CTRLBIT;
T*YdGIFO break;
nH[@EL case VK_SHIFT:
r43dnwX MaskBits&=~SHIFTBIT;
S;|%'Sn|j9 break;
}O
o default: //judge the key and send message
i~K~Czmok+ break;
X_%78$N-a` }
#lJF$ for(int index=0;index<MAX_KEY;index++){
P_b00",S if(hCallWnd[index]==NULL)
|W#^L`!G continue;
{?5EOp~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,{E'k+ {
Xc
Pn SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
pdtK3Pf bProcessed=TRUE;
+d#ZSNu/ }
q=96Ci _a }
C}+(L3Z }
w7dG=a& else if((lParam&0xc000ffff)==1){ //有键按下
ia?8Z"&lK switch(wParam)
`^_.E:f {
A;2?!i#f case VK_MENU:
:=~([oSNW" MaskBits|=ALTBIT;
r-'j#|^tz break;
Cs*u{O case VK_CONTROL:
\UNw43EL MaskBits|=CTRLBIT;
n'M}6XUw break;
[=LQ,e$r7 case VK_SHIFT:
mg#+%v MaskBits|=SHIFTBIT;
JNMZn/ break;
2OK%eVba default: //judge the key and send message
@8/-^Rh* break;
b,SY(Ce~g }
C/]0jAAE7 for(int index=0;index<MAX_KEY;index++){
W}T+8+RU if(hCallWnd[index]==NULL)
lHP[WO
continue;
8.9S91]= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1h)I&T"kZ {
,Zs-<e" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4|Z3;;%+ bProcessed=TRUE;
C:P, q6 }
CZbp}:| }
:L\@+}{(c }
m _:ib} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
D $ `yxc for(int index=0;index<MAX_KEY;index++){
U)c,ZxE if(hCallWnd[index]==NULL)
ql8CgL continue;
ZEApE+m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
?[VS0IBS SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
eb:u h! //lParam的意义可看MSDN中WM_KEYDOWN部分
-y$|EOi? }
tWc!!Hf2j }
nq_sbli }
K3\U'bRO return CallNextHookEx( hHook, nCode, wParam, lParam );
L*L3;y| }
uFECfh 6'*?zZrz 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:
k6*2=
xK~ Ng;E]2" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
tK]r>?Y\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
WH'[~O A\z[/3& RK 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:
%2qvK} )8LCmvQ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
8|i&Gbw+ {
&WsDYov? if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
jQ7RH/?_ {
Y{2\==~ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
NFc<%#H SaveBmp();
neOR/] return FALSE;
9Y-s],2V }
Ym!Ia&n …… //其它处理及默认处理
vw+
@'+
}
=zI
eZ7 nDaQ1 "3}Bv
X 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。
bCE[oi6hb !&19%C4 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。
`Jz"rh-M 9~>;sjJk 二、编程步骤
L! Q&?xP ZRcY; ? 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";
}vcC4 =t/ KZ<zsHX8H 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
+]*?J1Y8Z rEZa%)XJ 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;
HM--`RJ M[Ls:\1a 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;
j7O7P+DmS #msk'MVt 5、 添加代码,编译运行程序。
i}M&1E [Ma&=2h 三、程序代码
i' N z!t&zkAK ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
##yi^;3Y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
t5e% "}>7H #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
XlB`Z81j #if _MSC_VER > 1000
kGX`y.-[ #pragma once
KVqQOh'_T #endif // _MSC_VER > 1000
tS`fG; #ifndef __AFXWIN_H__
xB
4A"| #error include 'stdafx.h' before including this file for PCH
&.Yh_ #endif
U7
Z_ #include "resource.h" // main symbols
+mV4Ty class CHookApp : public CWinApp
qb
"H&)aHw {
R+, tn,<< public:
v#D9yttO{ CHookApp();
SAXjB;VH6 // Overrides
6P+8{?V& // ClassWizard generated virtual function overrides
,uuQj]Dac+ //{{AFX_VIRTUAL(CHookApp)
0UlaB
sv public:
[)9bR1wh virtual BOOL InitInstance();
Dth<hS,2J virtual int ExitInstance();
^=Up UB //}}AFX_VIRTUAL
7uxy<#Ar //{{AFX_MSG(CHookApp)
l=bB,7gL // NOTE - the ClassWizard will add and remove member functions here.
J;'?(xO3\ // DO NOT EDIT what you see in these blocks of generated code !
sx(yG9 //}}AFX_MSG
%VSST?aUvX DECLARE_MESSAGE_MAP()
G4AX8@;U };
O/l|\n LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
3P'.)=} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
jskATA
/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
cdzMao BOOL InitHotkey();
mVU(u_lh BOOL UnInit();
i>0I '~V #endif
tse(iX/D A-.jv //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
[4(TG<I #include "stdafx.h"
v@"xEf1n[ #include "hook.h"
3]<$;[Q #include <windowsx.h>
0(-'L\<>x #ifdef _DEBUG
Qh)@-r3 #define new DEBUG_NEW
Wc03Sv&FZ #undef THIS_FILE
jlzqa7 static char THIS_FILE[] = __FILE__;
Q)H Vh[4 #endif
>
NK?!!A_ #define MAX_KEY 100
g"xLS}Al #define CTRLBIT 0x04
$ShL^g@ #define ALTBIT 0x02
-\AB!#fh #define SHIFTBIT 0x01
S1 %{/w #pragma data_seg("shareddata")
(a]'}c$X9` HHOOK hHook =NULL;
[*8wv^ UINT nHookCount =0;
U}7$:hO"dX static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
ma?569Z8~0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
pk(<],0]X static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
g:e| static int KeyCount =0;
42tD$S5^ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
#.a4}ya19 #pragma data_seg()
=4+UX*&i?. HINSTANCE hins;
kw|bEL9!u void VerifyWindow();
<hQ@]2w$ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
\L6U}ZQ2V //{{AFX_MSG_MAP(CHookApp)
uZ%b6+( // NOTE - the ClassWizard will add and remove mapping macros here.
az0( 54M // DO NOT EDIT what you see in these blocks of generated code!
!tHqF //}}AFX_MSG_MAP
18V*Cu END_MESSAGE_MAP()
1wqCoDgkp k/!Vv#8 CHookApp::CHookApp()
M ~.w:~Jm {
LDr!d1A // TODO: add construction code here,
D@5&xd_@4 // Place all significant initialization in InitInstance
:
bT*cgD{ }
9?bfZF4A= BalOph4M[ CHookApp theApp;
`=b*g24z[N LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
NZ9`8&93 {
J'^BxN& BOOL bProcessed=FALSE;
Wky~ hm if(HC_ACTION==nCode)
G:A~nv9 {
q.~.1
'`! if((lParam&0xc0000000)==0xc0000000){// Key up
26.iFt/: switch(wParam)
Z(*nZT, {
-:cS}I case VK_MENU:
fC]+C(*d MaskBits&=~ALTBIT;
6DR@$fpt break;
_(J- MCY\ case VK_CONTROL:
hFj.d]S MaskBits&=~CTRLBIT;
j$&k;S break;
VH+^G)^) W case VK_SHIFT:
*Rr,ii MaskBits&=~SHIFTBIT;
!0 *=z~ break;
=EsKFt" default: //judge the key and send message
^*%p]r break;
aSXoYG0\ }
VlXIM, for(int index=0;index<MAX_KEY;index++){
Z]uN9c if(hCallWnd[index]==NULL)
ldanM>5 continue;
>sPu*8D40a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tN";o\!} {
B58H7NH ;G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
hH )jX`Ta bProcessed=TRUE;
Q gDjc' }
PFUb\AY }
=@gH$Q_1 }
?VS {,"X else if((lParam&0xc000ffff)==1){ //Key down
.'5yFBS switch(wParam)
2~ Gcoda {
^X"G~#v=q case VK_MENU:
dUOjPq97 MaskBits|=ALTBIT;
;&;coH8` break;
S)@R4{=e"V case VK_CONTROL:
JS}W4 N MaskBits|=CTRLBIT;
5j{o0&=_$ break;
TBrAYEk
case VK_SHIFT:
06 K8|K MaskBits|=SHIFTBIT;
4#;rv$
{ break;
' OdZ[AN default: //judge the key and send message
mL18FR N break;
$
7O[|:Yv }
!*?&V3! for(int index=0;index<MAX_KEY;index++)
^X[Kr=:Jp {
3=T<c?[ if(hCallWnd[index]==NULL)
}_@cqx:n^ continue;
6:ZqS~- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L1P]T4a@) {
_
CXKJ]m4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S;i^ucAF bProcessed=TRUE;
A<y3Tc?Q }
nU)}!` E }
NTs< ;ED }
[)Xu60?Q if(!bProcessed){
6(DK\58 for(int index=0;index<MAX_KEY;index++){
DY~~pi~ if(hCallWnd[index]==NULL)
7{8!IcR # continue;
eem.lVVD if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
:}UWy?F SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
}@!d(U* }
mZ ONxR6q$ }
3(E"$Se,f }
;9=9D{-4+ return CallNextHookEx( hHook, nCode, wParam, lParam );
)&se/x+ }
NAx( Qi3 iWGgt]RJ BOOL InitHotkey()
cS4e}\q, {
ogip#$A}3 if(hHook!=NULL){
08yTTt76t nHookCount++;
j)'V_@ return TRUE;
.<rL2`C[c }
;# {XNq<1 else
[WY
NA-O hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
_
nS';48 if(hHook!=NULL)
Rk2ZdNc\ nHookCount++;
\EUc17 return (hHook!=NULL);
A9p$5jt7 }
c c
,] BOOL UnInit()
f.V0uBDN {
qaG%PH}a if(nHookCount>1){
jR}h3! nHookCount--;
uhQ3 return TRUE;
rS>njG;R }
84e)huAs BOOL unhooked = UnhookWindowsHookEx(hHook);
=Ky1v$< if(unhooked==TRUE){
#9#N+ nHookCount=0;
PrDvRWM hHook=NULL;
N#Qby4w > }
, $78\B^ return unhooked;
YAC=V?U-# }
xO"5bj VqVP5nT'= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h9>~?1$lz {
}\*dD2qNL} BOOL bAdded=FALSE;
czdNqk.kh for(int index=0;index<MAX_KEY;index++){
(ai E!c if(hCallWnd[index]==0){
42U3> hCallWnd[index]=hWnd;
W%Br%VQJ HotKey[index]=cKey;
VskyRxfdW3 HotKeyMask[index]=cMask;
xg. d)n bAdded=TRUE;
1a/@eqF'' KeyCount++;
,yAvLY5P break;
Ga N4In[d }
rQj.W6w= }
lv&<kYWY return bAdded;
m#grtmyMrI }
bveNd0hN i\}, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\hv*`ukF {
#u|;YC BOOL bRemoved=FALSE;
+ 5sTGNG for(int index=0;index<MAX_KEY;index++){
8l+\Qyj if(hCallWnd[index]==hWnd){
XZZ Ml if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)I.[@#- hCallWnd[index]=NULL;
'n)M0e HotKey[index]=0;
<3Co/ .VQd HotKeyMask[index]=0;
Uu
}ai."iB bRemoved=TRUE;
~WR6rc KeyCount--;
} Yjic4? break;
xJ^Gtq Um }
So bK<6 }
Fg5>CppH }
Kdik7jL/J return bRemoved;
kpxd+w }
)h2wwq0] DE."XSni void VerifyWindow()
M!!W>A@T[g {
eu^z&R!um for(int i=0;i<MAX_KEY;i++){
l'B`f) if(hCallWnd
!=NULL){ WvUe44&^$
if(!IsWindow(hCallWnd)){ NrNbNFfo
hCallWnd=NULL; %$!}MxUM
HotKey=0; ?G0=\U<
o,
HotKeyMask=0; 1UyI.U]
KeyCount--; A;Xn#t ,(K
} p&:RSO
} `Qaw]&O
} $N+a4
} Le|Ho^h,Y
.QRQvtd.
BOOL CHookApp::InitInstance() ran
Q_\
{ l)a]V]oQ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6yv*AmFh
hins=AfxGetInstanceHandle(); ,%v
InitHotkey(); ?J%$;"q
return CWinApp::InitInstance(); i/-Xpj]Zf
} *D*K`dk
PZeVjL?E
int CHookApp::ExitInstance() }`h)+Im=
{ ^3*/x%A,g
VerifyWindow(); #f\U3p
UnInit(); vZhN%
DfY
return CWinApp::ExitInstance(); nFX8:fZ$>
} \iSaxwU_
]\sBl
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h&NcN-["
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wrac\.
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ UT==x<
#if _MSC_VER > 1000 I/pavh
#pragma once 9~
K1+%!
#endif // _MSC_VER > 1000 -P(q<T2MV'
eaYQyMv@
class CCaptureDlg : public CDialog M-T&K%/lW
{ ,DXNq`24
// Construction &>*fJ
public: wu/]M~XwI
BOOL bTray; |9~{&<^X
BOOL bRegistered; F1w~f
<
BOOL RegisterHotkey();
jiC;*]n
UCHAR cKey; daGGgSbh
UCHAR cMask; `GqS.O}C
void DeleteIcon(); Do=*bZ;A
void AddIcon(); #- f7hg*
UINT nCount; TPvS+_<oL{
void SaveBmp(); =HQH;c"
CCaptureDlg(CWnd* pParent = NULL); // standard constructor aq oT
// Dialog Data `5=0f}E
//{{AFX_DATA(CCaptureDlg) e~i
?E
enum { IDD = IDD_CAPTURE_DIALOG }; g5;
W6QX
CComboBox m_Key; Ex&f}/F
BOOL m_bControl; f,)[f M4
BOOL m_bAlt; l{\~I
BOOL m_bShift; w2@ `0
CString m_Path; ~{=+dQ
CString m_Number; FxTOc@<
//}}AFX_DATA 0 #VH=p ga
// ClassWizard generated virtual function overrides YB*ZYpRVl
//{{AFX_VIRTUAL(CCaptureDlg) 9bNjC&:4/]
public: ~+q$TV
virtual BOOL PreTranslateMessage(MSG* pMsg); (C!u3ke2D
protected: uG${`4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hGcOk[m 4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); r*p<7
//}}AFX_VIRTUAL &t+03c8g!
// Implementation M})2y+
protected: <&t^&6k
HICON m_hIcon; O<)"kj 7
// Generated message map functions Z>wg
o@z%
//{{AFX_MSG(CCaptureDlg) <6Y o%xt
virtual BOOL OnInitDialog(); ppM d
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); fY}e.lD
afx_msg void OnPaint(); PHyS^J`
afx_msg HCURSOR OnQueryDragIcon(); !D7/Ja
virtual void OnCancel(); *h-_
afx_msg void OnAbout(); L/"u,~[
afx_msg void OnBrowse(); zq8z#FN
afx_msg void OnChange(); Q*^zphT
//}}AFX_MSG A@?2qX^4
DECLARE_MESSAGE_MAP() 0>)('Kv
}; ;B:'8$j$
#endif kC!7<%(
B+`m
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file KNic$:i
#include "stdafx.h" ]$EKowi
#include "Capture.h" 15)=>=1mR.
#include "CaptureDlg.h" c_yf=
#include <windowsx.h> :05>~bn>pC
#pragma comment(lib,"hook.lib") k10dkBoEX
#ifdef _DEBUG pV=X
#define new DEBUG_NEW lw\OsB$
#undef THIS_FILE Om\?<aul
static char THIS_FILE[] = __FILE__; H/|Mq#K
#endif ${8 1~
#define IDM_SHELL WM_USER+1 QDzFl1\P
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $f7#p4;}(
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w5bD
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; TlYeYN5V
class CAboutDlg : public CDialog Y@c!\0e$
{ DQ?'f@I&*
public: %+:%%r=Q
CAboutDlg(); |0vY'A)]
// Dialog Data 2w $o;zz1
//{{AFX_DATA(CAboutDlg) ^}ngbDn
enum { IDD = IDD_ABOUTBOX }; b*n o.eB
//}}AFX_DATA gLaFIeF<+
// ClassWizard generated virtual function overrides }mxy6m ,
//{{AFX_VIRTUAL(CAboutDlg) 17a'C
protected: KA0Ui,q3
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w[^s)1
//}}AFX_VIRTUAL 1,p7Sl^h
// Implementation |>gya&
protected: ^+Ie
//{{AFX_MSG(CAboutDlg) #VgPg5k.<
//}}AFX_MSG Dr^#e
DECLARE_MESSAGE_MAP() +#"CgZ]
}; ZL:nohB
_bHmcK
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) JpvE c!cli
{ %4Y/-xF}9,
//{{AFX_DATA_INIT(CAboutDlg) SaH0YxnY+
//}}AFX_DATA_INIT x\]%TTps
} w`bojM@e1
nAZuA]p}S]
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 21O!CvX
{ ? DWF7{1
CDialog::DoDataExchange(pDX); ;[R{oW
Nw
//{{AFX_DATA_MAP(CAboutDlg) k#_B^J&d
//}}AFX_DATA_MAP f\nF2rlu
} |bk.gh
8`EzvEm
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) uLD%M av
//{{AFX_MSG_MAP(CAboutDlg) U]riBlg>
// No message handlers 5}x^0
LY
//}}AFX_MSG_MAP w^s|YF=c
END_MESSAGE_MAP() _ n,Ye&m
gI~Ru8
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B<SuNbR
: CDialog(CCaptureDlg::IDD, pParent) ^G.PdX$M
{ 2j9Mr
//{{AFX_DATA_INIT(CCaptureDlg) '2vZ%C$
m_bControl = FALSE; ypM0}pdvTp
m_bAlt = FALSE; x6d+`4
m_bShift = FALSE; {9q~bt
m_Path = _T("c:\\"); ykrb/j|rK
m_Number = _T("0 picture captured."); %>_ZUu3M
nCount=0; ]x8^s
bRegistered=FALSE; c|
bTray=FALSE; .E-)R
//}}AFX_DATA_INIT R*lJe6
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '#mv- /<t*
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~5<-&Dyp7
} I,OEor6%R(
h[b;_>7
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O~N0JK_>
{ LE%3..
!
CDialog::DoDataExchange(pDX); 4:GVZR|-
//{{AFX_DATA_MAP(CCaptureDlg)
M<hX!B
DDX_Control(pDX, IDC_KEY, m_Key); qn}4PVn4
DDX_Check(pDX, IDC_CONTROL, m_bControl); g]PmmK_L
DDX_Check(pDX, IDC_ALT, m_bAlt); `bw>.Ay
DDX_Check(pDX, IDC_SHIFT, m_bShift); ln-+=jk
DDX_Text(pDX, IDC_PATH, m_Path); {x{e?c!
DDX_Text(pDX, IDC_NUMBER, m_Number); )EZ#BF<0|
//}}AFX_DATA_MAP KP`{ UD)
} AC;ja$A#
JE9SPFQx9M
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {hr>m,O%
//{{AFX_MSG_MAP(CCaptureDlg) Hy`Ee7>
ON_WM_SYSCOMMAND() u;R<
ON_WM_PAINT() RoCX*3 d
ON_WM_QUERYDRAGICON() p0U4#dD6
ON_BN_CLICKED(ID_ABOUT, OnAbout) ^vPM\qP#g
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) tu8n1W
ON_BN_CLICKED(ID_CHANGE, OnChange) &i179Qg!
//}}AFX_MSG_MAP xs y5"
END_MESSAGE_MAP() FvQ>Y')R7Z
#!(OTe L
BOOL CCaptureDlg::OnInitDialog() 6}zargu(;
{ c193Or'6Y
CDialog::OnInitDialog(); MO|aN,
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); BO)K=gl;8
ASSERT(IDM_ABOUTBOX < 0xF000); :Lu=t3#
CMenu* pSysMenu = GetSystemMenu(FALSE); W9nmTz\8
if (pSysMenu != NULL) 2x%Xx3!
{ qOAK`{b
CString strAboutMenu; Qxr&zT7f
strAboutMenu.LoadString(IDS_ABOUTBOX); #\U;,r
if (!strAboutMenu.IsEmpty()) wN'Q\l+
{ <2@V$$Qg.~
pSysMenu->AppendMenu(MF_SEPARATOR); <3i2(k
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;/T=ctIs
} k`ulDQu
} n\Y{?x
SetIcon(m_hIcon, TRUE); // Set big icon r!A1Sfo4P
SetIcon(m_hIcon, FALSE); // Set small icon ^GMM%
m_Key.SetCurSel(0); `IL''eJug_
RegisterHotkey(); \@8j&],dl
CMenu* pMenu=GetSystemMenu(FALSE); 8D7=]
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); WfYu-TK*
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *F7ksLH|q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AG/?LPJ
return TRUE; // return TRUE unless you set the focus to a control OE_;i}58
} F*Lm=^:
RS'!>9I
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }j9V0`Q
{ d/oxRzk'L
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,ND}T#yTR
{ +72[*_ <
CAboutDlg dlgAbout; xaiA2
dlgAbout.DoModal(); gbF^m`A>%+
} }@JPvIE
else e
lj] e
{ ^PHWUb+``
CDialog::OnSysCommand(nID, lParam); DMO8~5
} NbG`v@yH
} \0.
c_
F#d`nZ=M
void CCaptureDlg::OnPaint() !U,W; R
{ :rr;9nMR[
if (IsIconic()) )"SP >2}
{ _4H
9rPhf
CPaintDC dc(this); // device context for painting Reci:T(_
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a?&{eMEe}
// Center icon in client rectangle rq=D[vX\N(
int cxIcon = GetSystemMetrics(SM_CXICON); ?U3X,uv5J
int cyIcon = GetSystemMetrics(SM_CYICON); ["]r=l
CRect rect; rm}OVL
GetClientRect(&rect); Wc]L43u
int x = (rect.Width() - cxIcon + 1) / 2; lxsBXX Zg
int y = (rect.Height() - cyIcon + 1) / 2; P,1[NW
// Draw the icon `x%(
n@ g
dc.DrawIcon(x, y, m_hIcon); N0`v;4gF$]
} Z1u:OI@(
else h,QC#Ak o
{ Y [8~M8QX
CDialog::OnPaint(); .C$4jR.KC
} J~dk4D\
} lI#Ap2@
7ip$#pzo
HCURSOR CCaptureDlg::OnQueryDragIcon() Qy!*U%tG'
{ yc ize2>q
return (HCURSOR) m_hIcon; ^B)iBfZ
} .8[Uk^q
/q.iUwSK>
void CCaptureDlg::OnCancel() E=PmOw7b
{ -1^dOG6*
if(bTray) !=sM `(=~
DeleteIcon(); YXeL7W
CDialog::OnCancel(); EtVRnI@
} M3>c?,O)J
]r6S|;:
void CCaptureDlg::OnAbout() R`%C]uG
{ )L^GGy8w
CAboutDlg dlg; osB8
'\GR
dlg.DoModal(); ++b1VBP
} f]N.$,:$
T_T@0`7
void CCaptureDlg::OnBrowse() !{hC99q6
{ |/Q7 o1i
CString str; ~CTe5PX c
BROWSEINFO bi; zB,Vi-)vH
char name[MAX_PATH];
v E4ce
ZeroMemory(&bi,sizeof(BROWSEINFO)); 8 cN[t.S
bi.hwndOwner=GetSafeHwnd(); 4rpx
bi.pszDisplayName=name; mBb;:-5
bi.lpszTitle="Select folder"; Yfro^}f
bi.ulFlags=BIF_RETURNONLYFSDIRS; Q:U^):~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^P)W/2
if(idl==NULL) j^ y9+W_b
return; a g=,oYn
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G.ag$KF
str.ReleaseBuffer(); 0[ (Z48
m_Path=str; 1^F
!X=
if(str.GetAt(str.GetLength()-1)!='\\') LI`L!6^l
m_Path+="\\"; G:u-C<^'
UpdateData(FALSE); k(<:
}
S xn#
d46PAA{'
void CCaptureDlg::SaveBmp() ,\t:R1.
{ 0Fd<@wQ0
CDC dc; *RPdU.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); -)='htiU
CBitmap bm; Io8h 8N-
int Width=GetSystemMetrics(SM_CXSCREEN); d#Hl3]wT
int Height=GetSystemMetrics(SM_CYSCREEN); kX0hRX
bm.CreateCompatibleBitmap(&dc,Width,Height); p_ H;|m9
CDC tdc; 6.uyY@Yx
tdc.CreateCompatibleDC(&dc); ?zFeP6C
CBitmap*pOld=tdc.SelectObject(&bm); "t[9EbFL
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @jXdQY%{
tdc.SelectObject(pOld); jY: )W*TXt
BITMAP btm; uL.)+E
bm.GetBitmap(&btm); dCbRlW
DWORD size=btm.bmWidthBytes*btm.bmHeight; |Z), OW
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $ NNd4d*
BITMAPINFOHEADER bih; -> $]`h"
bih.biBitCount=btm.bmBitsPixel; O7]p `Xi8
bih.biClrImportant=0; A"yiXc-N~\
bih.biClrUsed=0; 0Yh Mwg?
bih.biCompression=0; 0[\^Y<ec
bih.biHeight=btm.bmHeight; H]^hEQ3DT
bih.biPlanes=1; k/U1
: 9
bih.biSize=sizeof(BITMAPINFOHEADER); WAd5,RZ?
bih.biSizeImage=size; Ib8*rL0p<L
bih.biWidth=btm.bmWidth; {=Z xF
bih.biXPelsPerMeter=0; C2l=7+X#W
bih.biYPelsPerMeter=0; 2N)siH
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); yJyovfJz.
static int filecount=0; .mr&zq
CString name; J(0E'o{ug
name.Format("pict%04d.bmp",filecount++); D9hV`fA
name=m_Path+name; U,;a+z4\
BITMAPFILEHEADER bfh; wW.V>$q
bfh.bfReserved1=bfh.bfReserved2=0; 1=*QMEv1G
bfh.bfType=((WORD)('M'<< 8)|'B'); ] 2Vu+AP
bfh.bfSize=54+size; Z$a5vu*pg
bfh.bfOffBits=54; Z%rMX}
CFile bf; bSG}I|
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %3Ba9Nmid
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [9hslk
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); g?TPRr~$9
bf.WriteHuge(lpData,size); MXVQ90
bf.Close(); t> ~a/K"
nCount++; 6\9
Zc-%
} v--Qbu
GlobalFreePtr(lpData); <./r%3$;7
if(nCount==1) 2rzOh},RS
m_Number.Format("%d picture captured.",nCount); vS@;D7ep
else PG51+#
m_Number.Format("%d pictures captured.",nCount); *h <_gn
UpdateData(FALSE); -VC
kk
} -l:4I6-hi
_S$SL%;\
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rAv)k&l
{ PUU
"k:{
if(pMsg -> message == WM_KEYDOWN) QsO%m
{ 9 a$\l2
if(pMsg -> wParam == VK_ESCAPE) C>}@"eK
return TRUE; Q+i
if(pMsg -> wParam == VK_RETURN) CXAW>VdK_
return TRUE; uPbGQ :%}
} t9QnEP'
return CDialog::PreTranslateMessage(pMsg); 5]c\{G
} 80'!XKSP
y Tb OBl
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KxA^?,t[
{ 5 R*
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >'/KOK"
SaveBmp(); o(gEyK
return FALSE; \#yKCA';
} s%6{X48vY^
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L
`\>_
CMenu pop; (=jztIZC
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9"g!J|+
CMenu*pMenu=pop.GetSubMenu(0); (yr<B_Y'MY
pMenu->SetDefaultItem(ID_EXITICON); O
,9,=2j
CPoint pt; y
E;n.L
GetCursorPos(&pt); f4mQDRlD
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aSGZF w
if(id==ID_EXITICON) N I*x):bx
DeleteIcon(); ],W/IDv
else if(id==ID_EXIT) 6T`F'Fk[
OnCancel(); 6r]l8*34;
return FALSE; o/J2BZ<_<
} K6z)&<
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h1_9Xp~N
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8kRqF?rbj
AddIcon(); {:%A
return res; "p"M9P'
} !gyEw1Re7
?=},%^
void CCaptureDlg::AddIcon() ii)DOq#2
{ ?=FRnpU?
NOTIFYICONDATA data; r@30y/C
data.cbSize=sizeof(NOTIFYICONDATA); a,/wqX
CString tip;
'gaa@ !bg
tip.LoadString(IDS_ICONTIP); M^6!{c=MIi
data.hIcon=GetIcon(0); C/JFb zVx
data.hWnd=GetSafeHwnd(); ^e~m`R2fHh
strcpy(data.szTip,tip); F7"v}K]X
data.uCallbackMessage=IDM_SHELL; 9kO}054
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; vl"{ovoC
data.uID=98; 9w:F_gr
Shell_NotifyIcon(NIM_ADD,&data); ]lgI Q;r
ShowWindow(SW_HIDE); W3gBLotdg
bTray=TRUE; Vlf =gP
} s?9$o
Qq1
\*
/R6svz
void CCaptureDlg::DeleteIcon() E*W|>2nx]
{ S 9;:)
NOTIFYICONDATA data; 9 aacW
data.cbSize=sizeof(NOTIFYICONDATA); aCZ7G
%Y
data.hWnd=GetSafeHwnd(); ( +x!wX( x
data.uID=98; (p1}i::Y8
Shell_NotifyIcon(NIM_DELETE,&data); b\.l!v n0
ShowWindow(SW_SHOW); Vz\?a8qQ<
SetForegroundWindow(); .Bs~FIe^
ShowWindow(SW_SHOWNORMAL); vNn$dc
bTray=FALSE; dBeZx1Dy
} aGx[?}=
I;5:jT `
void CCaptureDlg::OnChange() C]f`
{ |'SgGg=E
RegisterHotkey(); -]-?>gkN5
} `at>X&Ce,
AnW72|=A(
BOOL CCaptureDlg::RegisterHotkey() u 6"v}gN
{ nuucYm%IF-
UpdateData(); !]l!I9
UCHAR mask=0; )zMsKfQ
UCHAR key=0; |9;MP&68
if(m_bControl) qN@-H6D1=
mask|=4; _yu_Ev}R
if(m_bAlt) }~bx==SF6!
mask|=2; 1=^edQ+
if(m_bShift) %gbvX^E?
mask|=1; wc~k4B9"
key=Key_Table[m_Key.GetCurSel()]; ][[\!og
if(bRegistered){ 9bb5?b/
DeleteHotkey(GetSafeHwnd(),cKey,cMask); :&-j{8p-
bRegistered=FALSE; p( 6!7t:
} ln&9WF\I
cMask=mask; 3x6@::s~
cKey=key; AfaoFn+
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z{p62|+Ck@
return bRegistered; ;#+Se,)
} {[tx^b
iqAME%m
四、小结 >=VtL4K^
VYAz0H1-_
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。