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:
7Y
4!
);xTl6Y9 一、实现方法
DLoH.Fd A ?[Wfq| 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:
&3 x
[0DV ,UxAHCR~9 #pragma data_seg("shareddata")
> q8)~ HHOOK hHook =NULL; //钩子句柄
|cl*wFm|3 UINT nHookCount =0; //挂接的程序数目
Md*.q^: static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
50Ov>(f@7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
\[]4rXZN0 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
j
HEt
static int KeyCount =0;
*dxE
( dP static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
pE{Ecrc3| #pragma data_seg()
%vRCs] 5M#LO@U 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。
Eo0/cln| $v1_M1 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
zCmx 1Djz rb]?"lizi BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Ed1y%mR> cKey,UCHAR cMask)
UYhxgPGsj {
5jsZJpk$ BOOL bAdded=FALSE;
:c9 H2 for(int index=0;index<MAX_KEY;index++){
{vp*m:K if(hCallWnd[index]==0){
r"`7ezun: hCallWnd[index]=hWnd;
/1b7f' HotKey[index]=cKey;
uP^u:'VjbH HotKeyMask[index]=cMask;
#@P0i^pFTB bAdded=TRUE;
lLS7K8;4W KeyCount++;
M[QQi2:& break;
4-oaq'//BT }
&BN#"- J }
A}(o1wuw return bAdded;
(btmg<WT" }
'%y;{,g* //删除热键
f'TEua_` BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]#vi/6\J {
Yw_!40` BOOL bRemoved=FALSE;
E[<*Al+N for(int index=0;index<MAX_KEY;index++){
mB"1QtD if(hCallWnd[index]==hWnd){
iWIq~t*,H] if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
\J(kM,ZJ hCallWnd[index]=NULL;
`Ay:;I HotKey[index]=0;
~JO.h$1C HotKeyMask[index]=0;
-B?cF9 bRemoved=TRUE;
\J;_%-Z KeyCount--;
DKF
'* break;
6w[EJ;=p_ }
W:K '2j }
oXUb_/ }
13+.> return bRemoved;
&0xM 2J }
dg_w$# W||&Xb iUk#hLLC DLL中的钩子函数如下:
o=Y'ns^a( W2'!Pc,W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Sb(OG 6 {
,e$6%R BOOL bProcessed=FALSE;
lc3Gu78 A/ if(HC_ACTION==nCode)
wxYGr`f {
ck\W'Y*Q7 if((lParam&0xc0000000)==0xc0000000){// 有键松开
f+8 QAvh switch(wParam)
\`E^>6!]q {
jcb&h@T8kv case VK_MENU:
5{bc&?" MaskBits&=~ALTBIT;
y
G3aF( break;
X-#&]^d case VK_CONTROL:
m xqY MaskBits&=~CTRLBIT;
eTuKu(0
E break;
jFUpf.v2 case VK_SHIFT:
A\#z<h[> MaskBits&=~SHIFTBIT;
YV!hlYOBi break;
~clX2U8u` default: //judge the key and send message
D
<R_eK break;
_^NyLI% }
FSn3p}FVa for(int index=0;index<MAX_KEY;index++){
gn&Zt}@[ if(hCallWnd[index]==NULL)
Hf\sF(, ( continue;
]!&$&t8. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*} ? {
_TGs .t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
kwL|gO1L bProcessed=TRUE;
~UZ3 lN\E }
^
nI2<P }
S_/S2(V" }
se`Eez} else if((lParam&0xc000ffff)==1){ //有键按下
rQyjNh switch(wParam)
&lLfVa-l {
YWvD+ case VK_MENU:
!ltq@8#_| MaskBits|=ALTBIT;
zX4RqI break;
1l"2 ~k case VK_CONTROL:
HE%/+mZN MaskBits|=CTRLBIT;
7HBf^N. break;
KE@+I.x case VK_SHIFT:
Uq$/Q7 MaskBits|=SHIFTBIT;
Dzf\m>H[ break;
)38%E;T{X default: //judge the key and send message
fg3Jv* break;
oV0T
}
Z)M
"`2Ur for(int index=0;index<MAX_KEY;index++){
,1#? 0q if(hCallWnd[index]==NULL)
&h5Y_no GX continue;
w9G|)UDib if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&hI!mo {
~x\uZ^: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Q(nTL WW bProcessed=TRUE;
zMFTkDY }
n@RmH>" }
suwR`2 }
5@m
,*n&[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
SL- 2 ^\R for(int index=0;index<MAX_KEY;index++){
)>:~XA|? if(hCallWnd[index]==NULL)
A-T-4I continue;
= IRot if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
*VsVCUCz5* SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4d5c]% //lParam的意义可看MSDN中WM_KEYDOWN部分
;v@ G }
tr[}F7n9 }
EGUlLqP6e }
<v|"eq} return CallNextHookEx( hHook, nCode, wParam, lParam );
@)6b }
]O"f % E(4c& 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
6+IhI?lI= P);s0Y|@H BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
[g/D<g5O BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
YQG<Q >0{}tRm-P& 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
U.Mfu9}#: PlzM`g$A LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
d^aVP {
+M0pmK! if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Snf_{A< {
e.n(NW //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
z!"vez SaveBmp();
?IVJ#6[ return FALSE;
(4+P7Z,Nc }
wsWFD xR …… //其它处理及默认处理
SV>tw`2 }
P }sr v745FIy< ZZT #V%Q=u 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。
^HC6v;K JI5o~;}m 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。
rL{R=0 c
C3>Ff' 二、编程步骤
@L3XBV2 q Q\j 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";
p'K`K\X WA`A/`taT 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
xqG<R5k>> j]BRf A 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;
Jl/w P KxkBP/`3Q 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;
Za:j;u
Y oACAC+CP 5、 添加代码,编译运行程序。
%!<Y }UhYwJf89 三、程序代码
[8iY0m_Qe 6zi>Q?] 1 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
\vA*dQ- #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
= s&Rk~2b/ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
X94a #if _MSC_VER > 1000
N''QQBUD #pragma once
ax&?Z5%a #endif // _MSC_VER > 1000
}Pcm'o_wT #ifndef __AFXWIN_H__
uZ+bo& #error include 'stdafx.h' before including this file for PCH
^D+J
k8 #endif
WMB%?30 #include "resource.h" // main symbols
jf9+H!?^N class CHookApp : public CWinApp
){;XI2 {
_ \D% public:
0fsVbC CHookApp();
\Vyys[MMY8 // Overrides
~t6q-P // ClassWizard generated virtual function overrides
A8)4nOXM //{{AFX_VIRTUAL(CHookApp)
.GrOdDK$ns public:
Un6R)MVT virtual BOOL InitInstance();
MEDh virtual int ExitInstance();
PYkhY;* //}}AFX_VIRTUAL
UL+Txc //{{AFX_MSG(CHookApp)
-%asHDQ{ // NOTE - the ClassWizard will add and remove member functions here.
QaWS%0go // DO NOT EDIT what you see in these blocks of generated code !
gmGK3am //}}AFX_MSG
:{7+[LcH7 DECLARE_MESSAGE_MAP()
fkV@3sj };
\@<7Vo, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
qN!oN* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Q0U~s\< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
c!6D{(sfh BOOL InitHotkey();
n]4E>/\ BOOL UnInit();
(@?mm #endif
fQ<sq0'e\ v3-/ [-XB: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
pj>R9zpn_ #include "stdafx.h"
.t8)`MU6. #include "hook.h"
+-izC%G #include <windowsx.h>
"5hk%T' #ifdef _DEBUG
hkMeUxS #define new DEBUG_NEW
R/hf"E1 #undef THIS_FILE
E]V,
@ static char THIS_FILE[] = __FILE__;
H/,KY/>i #endif
g3^s_*A #define MAX_KEY 100
"Y&I#&$b\ #define CTRLBIT 0x04
p Cz6[*kC #define ALTBIT 0x02
A
6(` #define SHIFTBIT 0x01
~A0]vcP #pragma data_seg("shareddata")
$WA wMS, HHOOK hHook =NULL;
X~{6$J|]#i UINT nHookCount =0;
bvox7V> static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
i<QDV
W9 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
]!hjKu" static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
)%(ZFn} static int KeyCount =0;
(.J/Ql0Y static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
^C>kmo3J #pragma data_seg()
`PWKA;W$0 HINSTANCE hins;
u0C:q`;z void VerifyWindow();
#xIg(nG BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
QkrQM&Im //{{AFX_MSG_MAP(CHookApp)
V?mP7 // NOTE - the ClassWizard will add and remove mapping macros here.
+=tdgw/ // DO NOT EDIT what you see in these blocks of generated code!
)GB#"2 //}}AFX_MSG_MAP
oo'9ZE/% END_MESSAGE_MAP()
85<k'>~L YvY|\2^K CHookApp::CHookApp()
QV|6"4\ {
G]lGoa}]`u // TODO: add construction code here,
C5 ~#lNC // Place all significant initialization in InitInstance
yF)o_OA[uR }
FXCBX:LnvU N/a4Gl( CHookApp theApp;
DB}Uzw| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!BQt+4G7 {
2?,Jn&i5 BOOL bProcessed=FALSE;
(UkP AE if(HC_ACTION==nCode)
hh;kBv07o {
/|EdpHx0 if((lParam&0xc0000000)==0xc0000000){// Key up
`YOYC switch(wParam)
O8;/oL4 U {
i?T-6{3I case VK_MENU:
t{})6 MaskBits&=~ALTBIT;
HUKrp*Hv break;
{;$oC4 case VK_CONTROL:
GQ(Y#HSq MaskBits&=~CTRLBIT;
BMp'.9Qgm break;
v
:pT(0N case VK_SHIFT:
\8CCa(H MaskBits&=~SHIFTBIT;
g->*@%?<w> break;
f_k'@e { default: //judge the key and send message
!)a_@d.;i break;
Du_5iuMh }
1/$PxQ for(int index=0;index<MAX_KEY;index++){
* +
T(i if(hCallWnd[index]==NULL)
BJ
UG<k continue;
<) * U/r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_S9)<RVI+ {
')xOL=w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
CCTU-Xz/ bProcessed=TRUE;
'|H+5# }
:1 +Aj
( }
.`D'eS6b }
x%dny]O1; else if((lParam&0xc000ffff)==1){ //Key down
oU=vl!\J switch(wParam)
0U=wGIO {
B.N#9u-vW case VK_MENU:
hQ#e;1uD MaskBits|=ALTBIT;
$>)0t@[f break;
9=j9vBV case VK_CONTROL:
xvl$,\iqE MaskBits|=CTRLBIT;
~b_DFj break;
7(@xk_Pl case VK_SHIFT:
D!`;v Z\> MaskBits|=SHIFTBIT;
'i+L break;
sVyV|!K default: //judge the key and send message
KZKE&bTx break;
(?e%w} }
Odwe1q& for(int index=0;index<MAX_KEY;index++)
U F"%FF {
Pb&tWv\ql if(hCallWnd[index]==NULL)
9c^ ,v_W@ continue;
R"W}\0k if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r!R-3LO0s {
}`qAb/Ov SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
&ijz'Sg3 bProcessed=TRUE;
H )ej]DXy }
8'PZA,CW }
P j }
R U)(|; if(!bProcessed){
J?O0ixU for(int index=0;index<MAX_KEY;index++){
f~VlCdf+ if(hCallWnd[index]==NULL)
Qx)b4~F? continue;
W,4!"*+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
HLWffO/ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;1(^H:7T }
C hF~ }
5%jhVys23 }
zsp%Cz7T return CallNextHookEx( hHook, nCode, wParam, lParam );
G80N8Lm }
x7S\-<8 ?tLApy^`? BOOL InitHotkey()
!1l~UB_ {
v]k-xn|$j if(hHook!=NULL){
-Q20af- nHookCount++;
Y5aG^wE[: return TRUE;
9,?~dx }
g<Z :`00| else
5m1J&TZ0 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
s!IIvF if(hHook!=NULL)
R,3cJ
Y_% nHookCount++;
_/1/{ return (hHook!=NULL);
Fx^wV^q3 }
9L>?N:%5 BOOL UnInit()
NzT
&K7v {
|0[Buh[_:c if(nHookCount>1){
<D a-rv8 nHookCount--;
8 W return TRUE;
@}
Ig*@ }
Qj^Uz+b BOOL unhooked = UnhookWindowsHookEx(hHook);
QXb2jWz if(unhooked==TRUE){
C~2!@<y nHookCount=0;
TsFhrtnx&X hHook=NULL;
S70#_{ }
KZ 5%q. return unhooked;
iM!2m$'s }
:SaZhY GxhE5f; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$M}"u[Qq {
=F@
+~)_ BOOL bAdded=FALSE;
s&$?m[w for(int index=0;index<MAX_KEY;index++){
T
6D+@i if(hCallWnd[index]==0){
3H,x4L5j hCallWnd[index]=hWnd;
5M>h[Q"R HotKey[index]=cKey;
cM%?Ot,mK" HotKeyMask[index]=cMask;
#aX#gh}1
bAdded=TRUE;
nL?P/ \ KeyCount++;
"lt <$. break;
}R;}d(C` }
AGFA;X }
f7*Qa!!2p] return bAdded;
<{W{
Y\_A> }
7L
#)yY jj`#;Y BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
li[[AAWVm {
Jh.~]\u BOOL bRemoved=FALSE;
J'2 Yrn for(int index=0;index<MAX_KEY;index++){
&MH8~LSb if(hCallWnd[index]==hWnd){
byI"
? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
L!:NL#M hCallWnd[index]=NULL;
qIJc\,' HotKey[index]=0;
suQTi'K1 HotKeyMask[index]=0;
ku,{NY
f^Y bRemoved=TRUE;
N5K(yY_T KeyCount--;
5ih>x3S1/ break;
6c!F%xU} }
mP*$wE9b,: }
eZ:iW#YF }
n1;a~0P return bRemoved;
J299mgB }
4
Y=0>FlY0 J%"5?)[z void VerifyWindow()
Osz=OO{ {
F9LKO3Rh#u for(int i=0;i<MAX_KEY;i++){
4AL,=C3 if(hCallWnd
!=NULL){ {-I+
if(!IsWindow(hCallWnd)){ Ar\fA)UQ`
hCallWnd=NULL; c(1tOQk.
HotKey=0; N/F_,>E
HotKeyMask=0; 29grb P
KeyCount--; oQ,n?on
} r??_2>Q
} >h8m8J
} AO`@&e]o
} HIw)HYF2
:JSxsA6k
BOOL CHookApp::InitInstance() SOG(&)b
{ Zsapu1HoL\
AFX_MANAGE_STATE(AfxGetStaticModuleState()); k% \;$u=%
hins=AfxGetInstanceHandle(); :g$"Xc8Zn
InitHotkey(); A'CD,R+gR
return CWinApp::InitInstance(); o.r D
} Otu?J_ d3
9Pg6,[*u
int CHookApp::ExitInstance() N^B7<~ bD
{ $G <r2lPy
VerifyWindow(); Q^<amM!
UnInit(); ps:"0^7
return CWinApp::ExitInstance(); >]_6|Wfl
} 78]*Jx>L
7}qxWz
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file O:I]v@
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n]vCvmt
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #:=c)[G8
#if _MSC_VER > 1000 ;fV"5H)U\
#pragma once vy2<'V*y}
#endif // _MSC_VER > 1000 ]UIN4E
v2rzHzFU
class CCaptureDlg : public CDialog c^"4l
9w
{ OE[7fDe'
// Construction 7]So=%q
public: tMdSdJ8
BOOL bTray; |63uoRr
BOOL bRegistered; %gn@B2z
BOOL RegisterHotkey(); Y\<w|LkD8
UCHAR cKey; "<Di
UCHAR cMask; z( ^?xv
void DeleteIcon(); M'|[:I.V
void AddIcon(); 5o{U$
UINT nCount; Jo qhmn$j
void SaveBmp(); @fA|y
CCaptureDlg(CWnd* pParent = NULL); // standard constructor XRM/d5
// Dialog Data x| D|d}
//{{AFX_DATA(CCaptureDlg) [<
9%IGH
enum { IDD = IDD_CAPTURE_DIALOG }; %qJgtu"8
CComboBox m_Key; r9-ayp#pC
BOOL m_bControl; 5mVO9Qj
BOOL m_bAlt; &B:L9^
BOOL m_bShift; 2T%sHp~qt
CString m_Path; 3bd`q
$
CString m_Number; b&,ZmDJh
//}}AFX_DATA 5m@'( ]j
// ClassWizard generated virtual function overrides hX,RuI
//{{AFX_VIRTUAL(CCaptureDlg) m0W3pf
public: MowAM+?^}
virtual BOOL PreTranslateMessage(MSG* pMsg); ,6^Xn=o #
protected: GXLh(d!C
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~tL:r=
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); s 7%iuP
//}}AFX_VIRTUAL D@5h$m5
// Implementation ~T9QpL1OJ
protected: K)1Lg?j
HICON m_hIcon; zSMM?g^T
// Generated message map functions 39[ylR|\
//{{AFX_MSG(CCaptureDlg) 37IHn6r\
virtual BOOL OnInitDialog(); K}n.k[Do
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U7fNA7#x"
afx_msg void OnPaint(); 1f"}]MbLR
afx_msg HCURSOR OnQueryDragIcon(); XdzC/{G
virtual void OnCancel(); G.N`
afx_msg void OnAbout(); RV]QVA*i
afx_msg void OnBrowse(); oFt_ yU-
afx_msg void OnChange(); 8Bc2?NI=
//}}AFX_MSG %y_pF?2@q
DECLARE_MESSAGE_MAP() l ~xXy<
}; Mj2Dat`p9
#endif '%+LQ"Bp
zLxuxf~4@
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7bGOE_r
#include "stdafx.h" Mx# P
>.
#include "Capture.h" V'za,.d-
#include "CaptureDlg.h" Hit)mwfYE
#include <windowsx.h> -J'ked
#pragma comment(lib,"hook.lib") 8t7r^[T
#ifdef _DEBUG ,DCUBD u&
#define new DEBUG_NEW {~#01p5
#undef THIS_FILE _ Fk^lDI-
static char THIS_FILE[] = __FILE__; 6/'X$}X
#endif 2>J;P C[;
#define IDM_SHELL WM_USER+1 )\W}&9 >
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?}uvpB1}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OB+ cE4$
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
>h9~
/
class CAboutDlg : public CDialog d;3f80Kd*
{ ,WoB)V.{(
public: }`2+`w%uZ
CAboutDlg(); R(}!gv}s
// Dialog Data %X\Rfn0J"
//{{AFX_DATA(CAboutDlg) QY\'Uu{
enum { IDD = IDD_ABOUTBOX }; D-m%eP.
//}}AFX_DATA |\ C.il7
// ClassWizard generated virtual function overrides FELW?Q?k
//{{AFX_VIRTUAL(CAboutDlg) h,/3}
protected: ep
l1xfr
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S4E@wLi
//}}AFX_VIRTUAL Vrp]YRL`
// Implementation J|z ' <W
protected: %yR80mn8
//{{AFX_MSG(CAboutDlg) -H5-6w$
//}}AFX_MSG 5["n] i
DECLARE_MESSAGE_MAP() 0h('@Hb.K#
}; ,M\/[_:
%7Gq#rq
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) v=IcVHuf
{ zHW&i~
//{{AFX_DATA_INIT(CAboutDlg) 'E\qqE[;
//}}AFX_DATA_INIT (+TL
]9P
} E_xk8X~
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2T"[$iH!7
{ `KP}pi\
CDialog::DoDataExchange(pDX); n8&x=Z}Xs
//{{AFX_DATA_MAP(CAboutDlg) s6oIj$
//}}AFX_DATA_MAP
Bf,}mCq
} ^$8WV&5q>
EOGz;:b&
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) iz`ys.Fu
//{{AFX_MSG_MAP(CAboutDlg) :O*62olC5
// No message handlers hnv0Loe.IW
//}}AFX_MSG_MAP 1a#R7chl
END_MESSAGE_MAP() (`f)Tt=`
\=@4F^U7`
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D._7)$d
: CDialog(CCaptureDlg::IDD, pParent) k%LsjN.S
{ N)YoWA>#bF
//{{AFX_DATA_INIT(CCaptureDlg) ^coj ETOv
m_bControl = FALSE; S`[r]msw
m_bAlt = FALSE; x=44ITe1n[
m_bShift = FALSE; U9//m=_
m_Path = _T("c:\\"); l{3ZN"`I
m_Number = _T("0 picture captured."); \Xg`@JrTM
nCount=0; N*Xl0m(Q
bRegistered=FALSE; 9/5EyV
bTray=FALSE; EJTa~
//}}AFX_DATA_INIT h56s ~(?O
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^}hSsE
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Dzw>[
} elb}]
+
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) A:,V)
{ j!?bE3r~
CDialog::DoDataExchange(pDX); El3Ayd3
//{{AFX_DATA_MAP(CCaptureDlg) !9=Y(rb
DDX_Control(pDX, IDC_KEY, m_Key); f.U.(
DDX_Check(pDX, IDC_CONTROL, m_bControl); %A;s3]V
DDX_Check(pDX, IDC_ALT, m_bAlt); 7Y*Q)DDy
DDX_Check(pDX, IDC_SHIFT, m_bShift); ]+AgXUrbOD
DDX_Text(pDX, IDC_PATH, m_Path); @S Quc
DDX_Text(pDX, IDC_NUMBER, m_Number); \'Ca%j
//}}AFX_DATA_MAP U{-[lpd
}
8B7,qxZ
*|/kKvN
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) uGS^*W$
//{{AFX_MSG_MAP(CCaptureDlg) %967#XI[y
ON_WM_SYSCOMMAND() aW$))J)0
ON_WM_PAINT() Bd*\|M
ON_WM_QUERYDRAGICON() L"V~MF
ON_BN_CLICKED(ID_ABOUT, OnAbout) Gjf1Ba
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Y t0s
ON_BN_CLICKED(ID_CHANGE, OnChange) ~1.~4~um
//}}AFX_MSG_MAP fn\&%`U
END_MESSAGE_MAP() !EO
2
T
^z Mm
BOOL CCaptureDlg::OnInitDialog() k.w}}78N2N
{ ]7_O#MY1
CDialog::OnInitDialog(); tsqWnz=)
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); dZjh@yGP.
ASSERT(IDM_ABOUTBOX < 0xF000); d0@czNWIC
CMenu* pSysMenu = GetSystemMenu(FALSE); bR?
$a+a)
if (pSysMenu != NULL) uB uwE6
{ qy~@cPT
CString strAboutMenu; W/I D8+:i
strAboutMenu.LoadString(IDS_ABOUTBOX); 'O]Ja-
if (!strAboutMenu.IsEmpty()) h2Jdcr#@FF
{ pNR69/wGi
pSysMenu->AppendMenu(MF_SEPARATOR); <\S
j5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $ *^E
} {V9}W<
} _7 9 ?,U]
SetIcon(m_hIcon, TRUE); // Set big icon #o-CG PE
SetIcon(m_hIcon, FALSE); // Set small icon jF%[.n[BU
m_Key.SetCurSel(0); Zr@G
RegisterHotkey(); 66~]7w
CMenu* pMenu=GetSystemMenu(FALSE); Lg4I6 G
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Z
]WA-Q6n
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); p~THliwd
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &OSyU4r
return TRUE; // return TRUE unless you set the focus to a control j;b<oQH
} ePJtdKN:
R]{AJ"p
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \V,;F!*#G
{ 5U/1Z{
if ((nID & 0xFFF0) == IDM_ABOUTBOX) NTtRz(
{ Z"fnjH
CAboutDlg dlgAbout; 2<@27C5
dlgAbout.DoModal();
b(~
gQM
} ;Q =EI%_tv
else jHx<}<
{ -cHX3UAEI
CDialog::OnSysCommand(nID, lParam); ,\K1cW~U5
} 8\^[@9g3\3
} x@]pUA1
"HQH]?!k
void CCaptureDlg::OnPaint() E*Q><UU
{ L.xzI-I@D
if (IsIconic()) ^vJ PeoW
{ $v6dB {%Qu
CPaintDC dc(this); // device context for painting 7^~pOFdH
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4JHFn [%
// Center icon in client rectangle ya'@AJS
int cxIcon = GetSystemMetrics(SM_CXICON); ?eb2T`\0Q
int cyIcon = GetSystemMetrics(SM_CYICON); [N/[7Q/y
CRect rect; gi7As$+E
GetClientRect(&rect);
F%6`D
int x = (rect.Width() - cxIcon + 1) / 2; ?~aM<rcZ
int y = (rect.Height() - cyIcon + 1) / 2; N3nk\)V\E
// Draw the icon WQ]~TGW
dc.DrawIcon(x, y, m_hIcon); e6f!6a+%
} LTY@}o]\U
else 0=8.8LnN(
{ yV xR||e
CDialog::OnPaint(); NdQXQa?,
} $2^V#GWo
} (0qdU;
O4&/g-
HCURSOR CCaptureDlg::OnQueryDragIcon() '7W?VipU
{ xnu|?;.}!
return (HCURSOR) m_hIcon; cmu5KeH
} XQk9 U
sf?D4UdIH
void CCaptureDlg::OnCancel() h"YIAQ',
{ ZBJYpeGe
if(bTray) KTk%Np
DeleteIcon(); B{|P}fN5}
CDialog::OnCancel(); >;QkV6i7
} 5-w6(uu
a'Qy]P}'Ug
void CCaptureDlg::OnAbout() /PIU@$DV
{ JPiC/
CAboutDlg dlg; \nx^=4*yk
dlg.DoModal(); g=[ F W@z
} (^9q7)n
}x-~>$:"
void CCaptureDlg::OnBrowse() cCU'~
{ "^<:7 _Y
CString str; (XRj##G{
BROWSEINFO bi; mw`%xID*
char name[MAX_PATH]; ?i(Tc!
ZeroMemory(&bi,sizeof(BROWSEINFO)); GwwxSB&y
bi.hwndOwner=GetSafeHwnd(); _e8@y{/~Fd
bi.pszDisplayName=name; ^$_ifkkLz
bi.lpszTitle="Select folder"; IVkKmO(qO
bi.ulFlags=BIF_RETURNONLYFSDIRS; $z{HNY*2
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ssi{(}H/Jv
if(idl==NULL) BaiC;&(
return; `U!eh1*b
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y#{KGVT<
str.ReleaseBuffer(); < W/-[ M
m_Path=str; o|l)oc6{
if(str.GetAt(str.GetLength()-1)!='\\') ?$;_a%v6
m_Path+="\\";
O\]CfzR
UpdateData(FALSE); tmK@Veb*a'
} \#2,1W@
D}cq_|mmn[
void CCaptureDlg::SaveBmp() 1(hgSf1WH
{ ^67P(h
CDC dc; V)Z*X88:Tv
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Qh/yPOSm:
CBitmap bm; AUS?Pt[w
int Width=GetSystemMetrics(SM_CXSCREEN); :XBeGNI*#
int Height=GetSystemMetrics(SM_CYSCREEN); 8,dCx}X
bm.CreateCompatibleBitmap(&dc,Width,Height); 1.yw\ZC\
CDC tdc;
!&SUoa
tdc.CreateCompatibleDC(&dc); 2d<ma*2n(
CBitmap*pOld=tdc.SelectObject(&bm); N;-+)=M,rf
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); # dW$"u
tdc.SelectObject(pOld); #hR}7K+@
BITMAP btm; O%(:8nIgZ
bm.GetBitmap(&btm); &}:Hp9n
DWORD size=btm.bmWidthBytes*btm.bmHeight; #1u4Hi(x5
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4(u+YW GX
BITMAPINFOHEADER bih; kfm8F8sxl
bih.biBitCount=btm.bmBitsPixel; pl
q$t/.U;
bih.biClrImportant=0; OYG8%L
bih.biClrUsed=0; W1r- uR
bih.biCompression=0; _jU6[y|XLh
bih.biHeight=btm.bmHeight; H0tjN&O_
bih.biPlanes=1; <&l3bL
bih.biSize=sizeof(BITMAPINFOHEADER); ,D
;`t
bih.biSizeImage=size; GE~mu76%
bih.biWidth=btm.bmWidth; A3'i
-
bih.biXPelsPerMeter=0; Om>6<3n
bih.biYPelsPerMeter=0; g"#R>&P
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x3wyIio*
static int filecount=0; Cd|V<BB9
CString name; QnaMjDh$6
name.Format("pict%04d.bmp",filecount++); w`>xK
sKW>
name=m_Path+name; )_xM)mH
BITMAPFILEHEADER bfh; [u)^QgP
bfh.bfReserved1=bfh.bfReserved2=0; 1__p1
bfh.bfType=((WORD)('M'<< 8)|'B'); 68 - I2@&
bfh.bfSize=54+size; <0R?#^XBZB
bfh.bfOffBits=54; .%WbXs
CFile bf; 0qJ(3N
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L8 R|\Bx
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); X5>p~;[9
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &~$^a1D6
bf.WriteHuge(lpData,size); f*oL8"?u&
bf.Close(); v,+2CVdW
nCount++; >K50 h
} tV#x{DN
GlobalFreePtr(lpData); <]CO}r
if(nCount==1) H1hj` '\"<
m_Number.Format("%d picture captured.",nCount); o5Pq>Y2T
else wk8XD(&
m_Number.Format("%d pictures captured.",nCount); Bsz kQ>#6
UpdateData(FALSE); H~||]_q|
} Ae`K9
x]y~KbdeB
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i/)Uj-*G)
{ lXv{+ic
if(pMsg -> message == WM_KEYDOWN) oWx!
'K6]V
{ ?LvZEiJ
if(pMsg -> wParam == VK_ESCAPE) 8#7z5:_
return TRUE; v9M;W+J
if(pMsg -> wParam == VK_RETURN) 2,NQ(c_c$
return TRUE; c(YNv4*X
} @Cw<wrem
return CDialog::PreTranslateMessage(pMsg); 6\b B#a
} l4r09"S|V
.D)'ZY
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Qy@chN{eP
{ wCn W]<+
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +XFF@h&=t
SaveBmp(); :[\}Hn=
return FALSE; \7gLk:
} ;t"#7\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Jqjb@'i
CMenu pop; Wl::tgU
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \t^q@}~0Wz
CMenu*pMenu=pop.GetSubMenu(0); gZ/M0px
pMenu->SetDefaultItem(ID_EXITICON); #/5jWH7U
CPoint pt; ^aXyho
GetCursorPos(&pt); Ay2Vz>{
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <P}{0Y~@*W
if(id==ID_EXITICON) b/5;377_
DeleteIcon(); GaM#a[p
else if(id==ID_EXIT) V:My1R0
OnCancel(); A[=)Zw
"
return FALSE; 5XA6IL|/l
} -4;{QB?
LRESULT res= CDialog::WindowProc(message, wParam, lParam); K^s!0[6
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) i<)c4
AddIcon(); ^Zydy
return res; IqcPml{\
} :m^eNS6:
A&F@+X6@
void CCaptureDlg::AddIcon() I)Lg=n$
{ i&{8a3B
NOTIFYICONDATA data; j4+hWalm
data.cbSize=sizeof(NOTIFYICONDATA); 8$xg\l0?KK
CString tip; ]}~*uT}>
tip.LoadString(IDS_ICONTIP); O' A''}M
data.hIcon=GetIcon(0); 3DMfR
ofg
data.hWnd=GetSafeHwnd(); |giK]Z
strcpy(data.szTip,tip); IWuR=I$t
data.uCallbackMessage=IDM_SHELL; Y
-o*d@
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6_`x^[r
data.uID=98; !)_80O1
Shell_NotifyIcon(NIM_ADD,&data); Lt|k}p@]
ShowWindow(SW_HIDE); mY#[D;mUe
bTray=TRUE; L?4c8!Q
} !T6oD]x3
u <D&RT
void CCaptureDlg::DeleteIcon() E3_EXz9h
{ tiI>iP`!
NOTIFYICONDATA data; t 0nGZ%`
data.cbSize=sizeof(NOTIFYICONDATA); 9I+;waLlB
data.hWnd=GetSafeHwnd(); r >u0Y
data.uID=98; ATk>:^n
Shell_NotifyIcon(NIM_DELETE,&data); Euk#C;uBg
ShowWindow(SW_SHOW); fPZBm&`C
SetForegroundWindow(); zp,f}
ShowWindow(SW_SHOWNORMAL); Uk6Y6mU V
bTray=FALSE; Xe:B*
} 4US8B=jk
573wK~9oMh
void CCaptureDlg::OnChange() )}]<o
|'
{ ,#`gwtFG
RegisterHotkey(); %4imlP
} ZgZ}^x
+2|X 7wA
BOOL CCaptureDlg::RegisterHotkey() NnGQ=$e
{ {ZY^tTsY
UpdateData(); s7D_fv4e
UCHAR mask=0; -Z4J?b
UCHAR key=0; k2j:s}RHY
if(m_bControl) t \Fc <
mask|=4; vXq=f:y4
if(m_bAlt) i ao/l
mask|=2; G5kM0vs6L
if(m_bShift) 9'Pyo`hJ#U
mask|=1; J=Ak+J
key=Key_Table[m_Key.GetCurSel()]; p%]*I?
if(bRegistered){ /-8v]nRB
DeleteHotkey(GetSafeHwnd(),cKey,cMask); A\i/@x5#
bRegistered=FALSE; &!N5}N&
} U@ALo
cMask=mask; }rn}r4_a
cKey=key; aVz<RS
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 67<zBw2
return bRegistered; 8rGW G
} #fk)Y1
0{BPT>'
四、小结 <{[AG3/Zj4
qaA\.h7
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。