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:
d4OWnPHv&}
fx&b*OC 一、实现方法
tHlKo0S$0 NV 6kj=r 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:
$2u^z=`b!% NjT#p8d X #pragma data_seg("shareddata")
IR; DdF HHOOK hHook =NULL; //钩子句柄
;Ml??B]C UINT nHookCount =0; //挂接的程序数目
^MJT lRUb static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
] .Mr&@ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
x8H%88!j* static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
,})x1y static int KeyCount =0;
.I%p0ds1r static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
$6\-8zNk #pragma data_seg()
e!cZW.B=`f VO"f=gFg 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
,0ZkE}<=w ="fq.Tt DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
|)'gQvDM JN;92|x BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Gt{'` P,&9 cKey,UCHAR cMask)
xs jJ8>G {
}2qmL$ BOOL bAdded=FALSE;
\@]/ks=K for(int index=0;index<MAX_KEY;index++){
GtZkzVqLd if(hCallWnd[index]==0){
XI6LPA0% hCallWnd[index]=hWnd;
XAN{uD^3\% HotKey[index]=cKey;
-
zaqL\ HotKeyMask[index]=cMask;
FQNw89g bAdded=TRUE;
xgl~4 KeyCount++;
Jz(!eTVs break;
['F, }
4{2)ZI# }
-!]Ie4" return bAdded;
[kc%+j<g }
lNV%R( //删除热键
~z''kH=e
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
f@roRn8p? {
![H!Y W' BOOL bRemoved=FALSE;
k:(i sKIA for(int index=0;index<MAX_KEY;index++){
z?~W]PWiZ if(hCallWnd[index]==hWnd){
oYWcX9R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
-BWkPq! hCallWnd[index]=NULL;
!*8x>,/> HotKey[index]=0;
#A|~s;s>N HotKeyMask[index]=0;
ag6hhkjA bRemoved=TRUE;
r.e,!B s KeyCount--;
?L|Jc_E break;
Q>gU( }
B7Um G)C }
A:"J&TbBx }
wE K@B&DV return bRemoved;
h3^&,U }
dvUBuY^[ yVPkJ f[)_=T+ DLL中的钩子函数如下:
g%w@v$ T W?O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@Kri)U
i {
Qi^MfHW BOOL bProcessed=FALSE;
06bl$% if(HC_ACTION==nCode)
ZIAiVq2) {
}z&P^p)R if((lParam&0xc0000000)==0xc0000000){// 有键松开
g
j`"| switch(wParam)
;K?fAspSH {
1r}fnT< case VK_MENU:
;??wLNdf- MaskBits&=~ALTBIT;
1Oo^ break;
d#T8|#O" case VK_CONTROL:
pt8X.f,iA MaskBits&=~CTRLBIT;
;%
*e}w0 break;
qR < case VK_SHIFT:
>Uvtsj# MaskBits&=~SHIFTBIT;
h
Ia{s) break;
*?oQ6g(Nz default: //judge the key and send message
-"5x? \.{m break;
xM%E; }
|0w'+HaE~N for(int index=0;index<MAX_KEY;index++){
yz-IZt( if(hCallWnd[index]==NULL)
( DwIAO/S continue;
e4NT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U-TwrX {
1G|Q~%cv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(7
Mn%Jp bProcessed=TRUE;
qce# }
!mL,Ue3/ }
#RJy }
.]Z M2 else if((lParam&0xc000ffff)==1){ //有键按下
p)tac*US switch(wParam)
k`js~/Xv {
5S7`gN. case VK_MENU:
U6X~]| o MaskBits|=ALTBIT;
%e7{ke}r break;
<E@7CG.= case VK_CONTROL:
H'I|tPs MaskBits|=CTRLBIT;
`ea$`2 break;
N(&FATZUW case VK_SHIFT:
( uOW5,e7 MaskBits|=SHIFTBIT;
8<P $E! break;
O(
he default: //judge the key and send message
/_,~dt break;
D0i84I`Z% }
Vu\|KL| for(int index=0;index<MAX_KEY;index++){
V@>?lv(\ if(hCallWnd[index]==NULL)
a\}|ikiE continue;
46_<v=YSJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%~p_bKd~ {
Z55,S=i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
eiEZtu bProcessed=TRUE;
}C*o;'o5G }
Ynz^M{9)K }
cYR6+PKua }
0*3 <} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
8.pz?{**T for(int index=0;index<MAX_KEY;index++){
$:u,6|QsS= if(hCallWnd[index]==NULL)
C2<y(GU[Bh continue;
|~\K:[T& if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
4
>&%-BhN SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
e!4akKw4wD //lParam的意义可看MSDN中WM_KEYDOWN部分
]nX.zE|F }
FG#j0#|* }
eU%5CVH.v }
M8[YW|VkP return CallNextHookEx( hHook, nCode, wParam, lParam );
sx]?^KR: }
=oQzL yFpHRfF} 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:
$,aU"'D G4x.''r&Sl BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x *qef_Hu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
,j_{IL690 t*qA.xc6 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
21o_9=[^ NWAF4i&$ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
UkqLLzL {
LV]\{' if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
fwq|8^S@ {
~JZLfw //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
h[Iu_#HMa SaveBmp();
N"T8
Pt return FALSE;
?ft_ }
1)YFEU&] …… //其它处理及默认处理
)K?GAj]Pq }
3P6'*pZ i*^K)SI8 ##s!-.T 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。
D46|)- `+f\Q2]Z 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。
0l:5hD,)F J<BdIKCma 二、编程步骤
O,>&w5 @ [FFYVru 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";
u}:O[DG yBe/UFp+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
c|.:J] ]bR'J\Fwl 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;
FRg6-G/S RdDcMZ 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;
K%gFD?{^q m[bu(q z 5、 添加代码,编译运行程序。
/,>.${,;u W" !amMQ 三、程序代码
_@p|A eLTNnz ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Q:M>!| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
.Ep3~9TBW #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
FGH>;H@ #if _MSC_VER > 1000
i3"sArP"| #pragma once
*]eZ Y #endif // _MSC_VER > 1000
h|H;ZC(B #ifndef __AFXWIN_H__
oTfbx+i/G #error include 'stdafx.h' before including this file for PCH
8$vH&HdI #endif
|pgkl` #include "resource.h" // main symbols
-,;Ep' class CHookApp : public CWinApp
m#ie{u^ {
#TWc` 8 public:
h+W^k+~( CHookApp();
?c2TT
Q // Overrides
5ZcnZlOOQ // ClassWizard generated virtual function overrides
GWVdNYpmr //{{AFX_VIRTUAL(CHookApp)
UBVb#FNF public:
_UBI,Dg] virtual BOOL InitInstance();
|gVO Iq virtual int ExitInstance();
vck$@3* //}}AFX_VIRTUAL
2T5xSpC //{{AFX_MSG(CHookApp)
oW[,EW+u // NOTE - the ClassWizard will add and remove member functions here.
8Vn6* Xn // DO NOT EDIT what you see in these blocks of generated code !
U.aa iX7 //}}AFX_MSG
duS #&w DECLARE_MESSAGE_MAP()
`Ek !;u> };
^ ?=K) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
*lK4yI*%o BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
?lK!OyCkc BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/pU6trIM BOOL InitHotkey();
XNUqZ-M: BOOL UnInit();
PNKT \yd #endif
JY2
F-0t) ;}~=W!yz //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7fay:_ #include "stdafx.h"
gDub+^ye>/ #include "hook.h"
`I8^QcP #include <windowsx.h>
.A\ \v6@ #ifdef _DEBUG
Jg:-TK/ #define new DEBUG_NEW
SR&
mHI-f0 #undef THIS_FILE
yj~"C$s static char THIS_FILE[] = __FILE__;
9i}D6te #endif
$3'+V_CZ3 #define MAX_KEY 100
O ->eg #define CTRLBIT 0x04
Z0eBx #define ALTBIT 0x02
XO#)i6}G #define SHIFTBIT 0x01
-o_TC #pragma data_seg("shareddata")
^\&g^T% HHOOK hHook =NULL;
}4]<P UINT nHookCount =0;
EQ7n'Wqq static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
DME?kh>7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
yCIgxPv|7 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`4H9f&8( static int KeyCount =0;
1Wk
EPj, static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
r`&|)Hx #pragma data_seg()
[
5W#1 & HINSTANCE hins;
SECQVA_y` void VerifyWindow();
6b70w @P! BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
I#X2UQzP //{{AFX_MSG_MAP(CHookApp)
J,G9m4Z7 // NOTE - the ClassWizard will add and remove mapping macros here.
SrtVoe[ // DO NOT EDIT what you see in these blocks of generated code!
J7ekIQgR //}}AFX_MSG_MAP
YC&jKx .> END_MESSAGE_MAP()
RLz`aBT _S2^;n? CHookApp::CHookApp()
Tn0l|GRuZA {
Z'NbHwW} // TODO: add construction code here,
As~p1%nok // Place all significant initialization in InitInstance
tOg
8L2 }
-;)SER3Wq4 A>t!/_" CHookApp theApp;
~}IvY?!; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L-C/Luws {
|SP.S 0.y BOOL bProcessed=FALSE;
bp>ps@zFq if(HC_ACTION==nCode)
3y=<w|4F {
Sq|1f?_gU if((lParam&0xc0000000)==0xc0000000){// Key up
)fMX!#KP switch(wParam)
te*Y]-&I|/ {
e#6&uFce case VK_MENU:
PyT}}UKj: MaskBits&=~ALTBIT;
Ac!&j=ZE break;
i9\\evJs case VK_CONTROL:
8<-oJs_o+ MaskBits&=~CTRLBIT;
j t`p<gI break;
}1]!#yMfq case VK_SHIFT:
]EM)_ :tRf MaskBits&=~SHIFTBIT;
@b!R2Yq break;
c,+(FQ9 default: //judge the key and send message
Jh&~/ntmm_ break;
'!fFI 1s }
e.}3OK for(int index=0;index<MAX_KEY;index++){
f_4S>C$ if(hCallWnd[index]==NULL)
f1Yv hvWL continue;
B)DC,+@$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lNaez3 {
^EUOmVN SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
8XYD
L]I' bProcessed=TRUE;
/G)KkBC }
c#n4zdQd]5 }
b>bgUDq }
I[g?Ju > else if((lParam&0xc000ffff)==1){ //Key down
5xMA~I 0c switch(wParam)
z^P* : {
w%8ooQ|C case VK_MENU:
qP;{3FSkAF MaskBits|=ALTBIT;
Ho )t=qn break;
!Bk[p/\ case VK_CONTROL:
IYfV~+P MaskBits|=CTRLBIT;
)e|$K=
D break;
NoJnchiU case VK_SHIFT:
"$~}'`(] MaskBits|=SHIFTBIT;
iJ`%yg, break;
|t&G&)~: default: //judge the key and send message
:$M9XZ~\ break;
$ ]W[y= }
U^[cYTG for(int index=0;index<MAX_KEY;index++)
<OR.q {
M.xhVgFf) if(hCallWnd[index]==NULL)
[!J
@a continue;
N+\oFbE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%w'/n>]j {
io9y;S"+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.N5hV3 bProcessed=TRUE;
%uGleY]~ }
Q^a&qYK }
Mvy6"Q: }
6CcB-@n4 if(!bProcessed){
935-{h@k for(int index=0;index<MAX_KEY;index++){
OwG6i|q if(hCallWnd[index]==NULL)
G0I~&?nDa continue;
vF9*tK' if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
b4Ricm SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
o,?!"*EP }
94~"U5oQ: }
/^++As0pY }
h]kn%?fpmB return CallNextHookEx( hHook, nCode, wParam, lParam );
Y3vX)D} }
RDUT3H6~ 6uu^A9x BOOL InitHotkey()
WW//heJe- {
p&i.)/ if(hHook!=NULL){
'8s>rH5[V nHookCount++;
G;2R]H#p return TRUE;
If~95fy~c }
;M}itM else
M:R8<.{ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
S:/{ if(hHook!=NULL)
/3J z3 nHookCount++;
%9t{Z1$ return (hHook!=NULL);
A5sf }
4cott^K. BOOL UnInit()
WHp97S'd {
Xl#Dw bx if(nHookCount>1){
tS?a){^:c nHookCount--;
bRWIDPh return TRUE;
_~tm7o+js }
<v]z6B@9! BOOL unhooked = UnhookWindowsHookEx(hHook);
Z+NF(d if(unhooked==TRUE){
`-4'/~G nHookCount=0;
24//21m hHook=NULL;
d'ZS;l }
F;#zN return unhooked;
92ZWU2" }
vwVVBG;t %Nj #0YF] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
gdl| ^*tc {
#;`Oj BOOL bAdded=FALSE;
a>U6Ag< for(int index=0;index<MAX_KEY;index++){
I6+2>CUGo if(hCallWnd[index]==0){
Nu@5 kwH hCallWnd[index]=hWnd;
y`4{!CEyLW HotKey[index]=cKey;
J7:9_/e0T HotKeyMask[index]=cMask;
(qUK7$ bAdded=TRUE;
j?xk& KeyCount++;
W@^J6sH break;
>:2}V]/; }
Dzr e' }
8"x9#kyU<3 return bAdded;
)Ob]T{GY }
gY!N3 *: L?8^aG BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
oCVku:. {
ZZ("-#? BOOL bRemoved=FALSE;
><=rIhG%H@ for(int index=0;index<MAX_KEY;index++){
Yrxk Kw# if(hCallWnd[index]==hWnd){
it)ZP H if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
?eV_ACpZ8 hCallWnd[index]=NULL;
Wwhgo.Wx HotKey[index]=0;
:m Kxa HotKeyMask[index]=0;
0Gsu bRemoved=TRUE;
mw4JQ\ KeyCount--;
0/Z
!5-. break;
=WK04\H }
:3^dF}> }
2bLI%gg3 }
RBE7485 return bRemoved;
t`YWwI. }
E]1##6Ae d)tiO2W void VerifyWindow()
_R^y\1Qu {
<7'&1=%r for(int i=0;i<MAX_KEY;i++){
`\N]wlB2/b if(hCallWnd
!=NULL){ uw33:G
if(!IsWindow(hCallWnd)){ mb1Vu
hCallWnd=NULL; <6jFKA<
HotKey=0; w2OsLi Sv
HotKeyMask=0; G;s"h%Xw98
KeyCount--; BvK QlT
} ,h&a9:+i
} xS8,W
} 3v1 7"
} ){P^P!s$
BpH%STEN
BOOL CHookApp::InitInstance() 9I.^LZ"
{ ag8`O&+
AFX_MANAGE_STATE(AfxGetStaticModuleState()); g^l RG3a
hins=AfxGetInstanceHandle(); S^N{wZo
InitHotkey(); bL`eiol6
return CWinApp::InitInstance(); &= eYr{
} #jA) >z\Q^
~3CVxbB^<
int CHookApp::ExitInstance() opp!0:jS*
{ %tm p
VerifyWindow(); @i LIU}+
UnInit(); ?S tsH
return CWinApp::ExitInstance(); D4Etl5k
} ->gZ)?Fqy
VkZ.6kV
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %8r/oS
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _<*Hv*Zm
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !{Z~<Ky
#if _MSC_VER > 1000 `A)"%~
#pragma once Vn|1v4U!
#endif // _MSC_VER > 1000 QlEd6^&
PsnGXcj
class CCaptureDlg : public CDialog 7L3ik;>
{ Riry_
// Construction 314=1JbL
public: wtH~-xSB|
BOOL bTray; z|N3G E(.@
BOOL bRegistered; WZn.;
BOOL RegisterHotkey(); 9P WY52!
UCHAR cKey; *%gF2@=r8F
UCHAR cMask; 1^G{tlA-
void DeleteIcon(); c#cx>wq9
void AddIcon(); s'\$t
UINT nCount; /+|#^:@
void SaveBmp(); dl~|Izm
CCaptureDlg(CWnd* pParent = NULL); // standard constructor OW@\./nM
// Dialog Data ,d_Gn!
//{{AFX_DATA(CCaptureDlg) 9`B$V##-L
enum { IDD = IDD_CAPTURE_DIALOG }; <AoXEuD
CComboBox m_Key; I)SG wt-
BOOL m_bControl; ~nY]o"8D
BOOL m_bAlt; #&
?g %'
BOOL m_bShift; +-$Ko fnM
CString m_Path; L{fFC%|l2L
CString m_Number; c&nh>oN
//}}AFX_DATA W!L+(!&H
// ClassWizard generated virtual function overrides Zjh2{ :
//{{AFX_VIRTUAL(CCaptureDlg) ^Q}eatEn
public: PBjmGwg7
virtual BOOL PreTranslateMessage(MSG* pMsg); {*m ?Kc7k
protected: Dt|)=a
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K9Hqq7"%
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); EcL-V>U#M
//}}AFX_VIRTUAL %;xOB^H^
// Implementation #]Y>KX2HG
protected: 7:E!b=o#
HICON m_hIcon; .ic:`1
// Generated message map functions u9qMqeF
//{{AFX_MSG(CCaptureDlg) LW)H"6v
virtual BOOL OnInitDialog(); uBrMk
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Cfu=u *u
afx_msg void OnPaint(); J @IS\9O
afx_msg HCURSOR OnQueryDragIcon(); =n(3o$r(
virtual void OnCancel(); KvFMs\o6p
afx_msg void OnAbout(); xg@NQI@7
afx_msg void OnBrowse(); 0MF}^"R
afx_msg void OnChange(); -V.d?A4"
//}}AFX_MSG r=.A'"Kf
DECLARE_MESSAGE_MAP() sBX-X$*N
}; Z~
#endif +kK
q!~ -(&S
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file bpAv1udX-W
#include "stdafx.h" Gbpw5n;e
#include "Capture.h" \c,pEXG
#include "CaptureDlg.h" lCd@jB{
#include <windowsx.h> OHrY(I6
#pragma comment(lib,"hook.lib") 68fiG
#ifdef _DEBUG &
WOiik
#define new DEBUG_NEW `mfq
2bVc
#undef THIS_FILE q/9H..6
static char THIS_FILE[] = __FILE__; n{0Ld -zH
#endif B;6]NCxD
#define IDM_SHELL WM_USER+1 EI>l-N2
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pO Iq%0]
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8LkP)]4^sO
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; EI~"L$?
class CAboutDlg : public CDialog .0 )Y
{ ~5
N)f
UI\
public: k,F"-K+M
CAboutDlg(); /'2O.d0}.
// Dialog Data ]
Wy)
//{{AFX_DATA(CAboutDlg) R:-JkV>e:
enum { IDD = IDD_ABOUTBOX }; +yob)%
//}}AFX_DATA f"u*D,/sS
// ClassWizard generated virtual function overrides >I
//{{AFX_VIRTUAL(CAboutDlg) @oF$LMD
protected: #o/H~Iv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >Iewx
Gb>
//}}AFX_VIRTUAL |s#'dS;
// Implementation `(+o=HsD
protected: SKuIF*"!S
//{{AFX_MSG(CAboutDlg) aJL^AG
//}}AFX_MSG ev0oO+u
DECLARE_MESSAGE_MAP() ne61}F"E
}; .#u_#=g?
)3YtIH_
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,mS/h~-5n
{ U t-B^x)gl
//{{AFX_DATA_INIT(CAboutDlg) o@]So(9f
//}}AFX_DATA_INIT \l"&A
} E5el?=,i
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) tt?58dm|
{ .@-9'<K?~
CDialog::DoDataExchange(pDX); TSAU?r\P
//{{AFX_DATA_MAP(CAboutDlg) &R|/t:DN
//}}AFX_DATA_MAP f\+fo
} -LDCBc"
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cYx4~ V^
//{{AFX_MSG_MAP(CAboutDlg) W3vi@kb]
// No message handlers #po5_dE\*
//}}AFX_MSG_MAP ~^u16z,
END_MESSAGE_MAP() Ftw;Yz
R(P%Csbqh
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2 oa#0`{
: CDialog(CCaptureDlg::IDD, pParent)
{7!UQrm<
{ =NbI%
//{{AFX_DATA_INIT(CCaptureDlg) tt%MoQ)
m_bControl = FALSE; 6.5T/D*TT
m_bAlt = FALSE; GV)<Q^9
m_bShift = FALSE; ) xbO6V
m_Path = _T("c:\\"); %}86D[PF
m_Number = _T("0 picture captured."); nf1#tlIJd
nCount=0; d!KsNkk
bRegistered=FALSE; pA{ 5V9
bTray=FALSE; 2,lqsd:xM
//}}AFX_DATA_INIT ]M)O YY
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !R*-R.%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V`adWXu
} $Vc~/>
o7B[R) 4
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &t5{J53
{ U yw-2]!n
CDialog::DoDataExchange(pDX); Xh J,"=E+
//{{AFX_DATA_MAP(CCaptureDlg) Rwr 2gMt7
DDX_Control(pDX, IDC_KEY, m_Key); ^xf<nNF:p
DDX_Check(pDX, IDC_CONTROL, m_bControl); *. 3N=EO
DDX_Check(pDX, IDC_ALT, m_bAlt); t_ksvWUo
DDX_Check(pDX, IDC_SHIFT, m_bShift); ,!V]jP)
DDX_Text(pDX, IDC_PATH, m_Path); K1V#cB
WO
DDX_Text(pDX, IDC_NUMBER, m_Number); e]=!"nJ+
//}}AFX_DATA_MAP MNH1D!}
} F}"] 92
y9#$O(G
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {lth+{&L#
//{{AFX_MSG_MAP(CCaptureDlg) Zo KcJA
ON_WM_SYSCOMMAND() d:G]1k;z
ON_WM_PAINT() OD Ur
ON_WM_QUERYDRAGICON() D>Gt]s
ON_BN_CLICKED(ID_ABOUT, OnAbout) o]IjK
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) IVlf=k
ON_BN_CLICKED(ID_CHANGE, OnChange) DmXcPJ[9
//}}AFX_MSG_MAP @aQ1khEd
END_MESSAGE_MAP() c!8=lrT.
RzhWD^b B
BOOL CCaptureDlg::OnInitDialog() $+}+zZX5
{ 8 6f2'o+
CDialog::OnInitDialog(); 65ly2gl
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OT^%3:zg
ASSERT(IDM_ABOUTBOX < 0xF000); 6Es?
MW=
CMenu* pSysMenu = GetSystemMenu(FALSE); qyHZ M}/
if (pSysMenu != NULL) EQqx+J&!
{ iCP/P%
CString strAboutMenu; !ZDzEP*
strAboutMenu.LoadString(IDS_ABOUTBOX); 7?OH,^
if (!strAboutMenu.IsEmpty()) m8623DB"
{ CukC6ub
pSysMenu->AppendMenu(MF_SEPARATOR); 1>Q{Gs^
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'gQidf
} (h']a!
} OdMO=Hy6d
SetIcon(m_hIcon, TRUE); // Set big icon s08u @
SetIcon(m_hIcon, FALSE); // Set small icon R~bC,`Bh
m_Key.SetCurSel(0); avmcw~
TF
RegisterHotkey(); !h&g7do]Z
CMenu* pMenu=GetSystemMenu(FALSE); [nxE)D
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \yrisp#`
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <lr*ZSNY
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]0D}T'wM
return TRUE; // return TRUE unless you set the focus to a control ThW,Y"
l
} $o@R^sJ
Gf8s?l
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ou'?]{
{ DN4#H`
if ((nID & 0xFFF0) == IDM_ABOUTBOX) NGYyn`Lx
{ OPpjuIRv
CAboutDlg dlgAbout; 66snC{gU
dlgAbout.DoModal(); 5)1+~ B
} y(
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else P`U<7xF~
{ }~Q"s2
CDialog::OnSysCommand(nID, lParam); 6]Q3Yz^h
} Ct$82J
} a:SQ16_?
F=G{)*Ih
void CCaptureDlg::OnPaint() 'NZGQebK
{ [%HIbw J
if (IsIconic()) 4^c-D
{ EjEFg#q
CPaintDC dc(this); // device context for painting $#o1MX
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); OLq
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// Center icon in client rectangle :ZdUx
int cxIcon = GetSystemMetrics(SM_CXICON); oN[Th
int cyIcon = GetSystemMetrics(SM_CYICON); "$p#&W69"J
CRect rect; t$^l<ppQ
GetClientRect(&rect); ]kktoP|D
int x = (rect.Width() - cxIcon + 1) / 2; jm>3bd
int y = (rect.Height() - cyIcon + 1) / 2; @-.? B
// Draw the icon z?8~[h{i%
dc.DrawIcon(x, y, m_hIcon); gLj?Ys
} <*'cf2Q$Av
else [nN7qG
{ L^9HH)Jc
CDialog::OnPaint(); ~M?|Vn
} !7lj>B A>
} $]d*0^J 6
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HCURSOR CCaptureDlg::OnQueryDragIcon() cErI%v}v0
{ XOrfs sj
return (HCURSOR) m_hIcon; 6=|&tE
} '|K.k6
&R$Q\,
void CCaptureDlg::OnCancel() >POO-8Q
{ $&-5;4R'0
if(bTray) A-E+s~U8
DeleteIcon(); tR`S#rk
CDialog::OnCancel(); 8q_0,>w%
} H;vZm[\0N-
H~+xB1
void CCaptureDlg::OnAbout() 6o}V@UzqV
{ MB$a82bY
CAboutDlg dlg; ?#[)C=p]z
dlg.DoModal(); w-FnE}"l
} to3?$-L
N_' +B+U?
void CCaptureDlg::OnBrowse() @6.]!U4w
{ R8sck)k'}
CString str; ,7/
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BROWSEINFO bi; VyZV(k
char name[MAX_PATH]; F?*k}]Gi
ZeroMemory(&bi,sizeof(BROWSEINFO)); 0<P(M: a
bi.hwndOwner=GetSafeHwnd(); -q2MrJ*
bi.pszDisplayName=name; Y}1P~
bi.lpszTitle="Select folder"; c>MY$-PD
bi.ulFlags=BIF_RETURNONLYFSDIRS; b~wKF0vq
LPITEMIDLIST idl=SHBrowseForFolder(&bi); jb@\i@-
if(idl==NULL) Qilj/x68
return; /Dd\PjIH{
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); sco
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str.ReleaseBuffer(); gduxA/aT
m_Path=str; A~y VYC6l
if(str.GetAt(str.GetLength()-1)!='\\') 6o
lV+
m_Path+="\\"; u8uW9 <
UpdateData(FALSE); y9
uVCR
} D0M!"c>\
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void CCaptureDlg::SaveBmp() yV_
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{ g\J)= ,ju,
CDC dc; z\$;'
dc.CreateDC("DISPLAY",NULL,NULL,NULL); eiB(VOJ
CBitmap bm; @^HwrwRA
int Width=GetSystemMetrics(SM_CXSCREEN); [f(uqLdeM
int Height=GetSystemMetrics(SM_CYSCREEN); jEE_D +K
bm.CreateCompatibleBitmap(&dc,Width,Height); lm &^tjx
CDC tdc; *^6k[3VY
tdc.CreateCompatibleDC(&dc); 0~i q G
CBitmap*pOld=tdc.SelectObject(&bm); g^n;IE$B
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VD4S_qx
tdc.SelectObject(pOld); GU#Q}L2
BITMAP btm; y[p6y[r*
bm.GetBitmap(&btm); qa;EI ;8
DWORD size=btm.bmWidthBytes*btm.bmHeight; wLSjXpP8
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]TfeBX6ST
BITMAPINFOHEADER bih; 6m\*]nOy4
bih.biBitCount=btm.bmBitsPixel; (WkTQRcN,
bih.biClrImportant=0; AG=9b
bih.biClrUsed=0; 7(5]Ry:
bih.biCompression=0; QS%,7'EG
bih.biHeight=btm.bmHeight; =%)})
bih.biPlanes=1; o]
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bih.biSize=sizeof(BITMAPINFOHEADER); |WUA1g
bih.biSizeImage=size; &BTfDsxAK
bih.biWidth=btm.bmWidth; KwQXA'
bih.biXPelsPerMeter=0; O{*GW0}55
bih.biYPelsPerMeter=0; d)9PEtI
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ew/KZE
static int filecount=0; iF+S%aPd#
CString name; LP8o7%sv!
name.Format("pict%04d.bmp",filecount++); T+3k$G[e/
name=m_Path+name; {MA@A5
BITMAPFILEHEADER bfh; ,&4zKm
bfh.bfReserved1=bfh.bfReserved2=0;
]&/0
bfh.bfType=((WORD)('M'<< 8)|'B'); @ >
cdHv
bfh.bfSize=54+size; #<D@3ScC
bfh.bfOffBits=54; y K=S!7p\
CFile bf; e|35|I '
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HI7]%<L
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :R{x]sv
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "@aq@mY@
bf.WriteHuge(lpData,size); $)4GCP
bf.Close(); aKaR
nCount++; [`cdlx?Eh
} #IbS
GlobalFreePtr(lpData); J,.j_ii`!
if(nCount==1) )Fw
@afE~
m_Number.Format("%d picture captured.",nCount); {_?T:`
else 0@JilGk1u
m_Number.Format("%d pictures captured.",nCount); qZ `n Zi
UpdateData(FALSE); 6yy|V~5
} j\%?<2dj=
#_?426Wfs
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) qr7 X-[&
{ .G7]&5s
if(pMsg -> message == WM_KEYDOWN) UZ[/aq
{ Fc34Y0_A
if(pMsg -> wParam == VK_ESCAPE) `%KpTh
return TRUE; \ 9[NH/.Z{
if(pMsg -> wParam == VK_RETURN) ^aGZJiyJ
return TRUE; 6~:W(E}
} }wa}hIqx
return CDialog::PreTranslateMessage(pMsg); r\4*\
} H5 p}Le
!N@S^JD6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) UrD=|-r`
{ 8@9hU`H8l
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ JL}hOBqfI
SaveBmp(); lBizC5t!o
return FALSE; HPu/. oE
} $gj+v+%N
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +0oyt?
CMenu pop; RT8_@8
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); XhHel|!g:
CMenu*pMenu=pop.GetSubMenu(0); {<''OwQF~+
pMenu->SetDefaultItem(ID_EXITICON); 9 AQ96
CPoint pt; N'lGA;}i
GetCursorPos(&pt); doxdRYKL
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1B9Fb.i
if(id==ID_EXITICON) 9^#zxmH)
DeleteIcon(); =hZ&66
else if(id==ID_EXIT) 60U{ e}Mkb
OnCancel(); -Fp!w "=T
return FALSE; l`~a}y "n
} []6ShcqJ[v
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZTgAZ5_cz
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Zh@4_Z9n!
AddIcon(); !_^{udB}
return res; h=iA;B^>
} zezofW]a
\
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void CCaptureDlg::AddIcon() z1{E:~f
{ u@:=qd=\
NOTIFYICONDATA data; s&_IWala
data.cbSize=sizeof(NOTIFYICONDATA); pR@GvweA
CString tip; 9 :K
tip.LoadString(IDS_ICONTIP); v
,G-k2$Qe
data.hIcon=GetIcon(0); ?C#F?N0
data.hWnd=GetSafeHwnd(); u$Pf.#
strcpy(data.szTip,tip); Y_Z
&p#Q!
data.uCallbackMessage=IDM_SHELL; t`Y1.]@U
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )LMBxyS
data.uID=98; b Q9"GO<X
Shell_NotifyIcon(NIM_ADD,&data); Chb4VoE
ShowWindow(SW_HIDE); Fb\2df{@
bTray=TRUE; mNBpb}
} pT_e;,KW
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void CCaptureDlg::DeleteIcon() tx|"v|&e2
{ =?I1V#.
NOTIFYICONDATA data; WW8L~4Zy
data.cbSize=sizeof(NOTIFYICONDATA); dZ]\1""#H
data.hWnd=GetSafeHwnd(); !w;A=
data.uID=98; (
F"& A?
Shell_NotifyIcon(NIM_DELETE,&data); $U"P+
ShowWindow(SW_SHOW); tUAY]BJ*s
SetForegroundWindow(); }HA2ce\
ShowWindow(SW_SHOWNORMAL); 0t:|l@zB
bTray=FALSE; ''\cBM!
} WKYA9BaR
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void CCaptureDlg::OnChange() YRM6\S)py
{ ^&G O4u
RegisterHotkey(); qdkTg: QJ,
} -~Z@,
onJ[&f
BOOL CCaptureDlg::RegisterHotkey() 8L9S^ '
{ EK- bvZ
UpdateData(); K~hlwjrt
UCHAR mask=0; H@&"M%
UCHAR key=0; I`n1M+=%
if(m_bControl) gQ+_&'C
mask|=4; "6Hjji@A
if(m_bAlt) ?;.+A4
mask|=2; 3z/O`z
if(m_bShift) FUTyx"
mask|=1; /*R' xBr
key=Key_Table[m_Key.GetCurSel()]; Nm:|C 3_I
if(bRegistered){ )dN,b(w9
DeleteHotkey(GetSafeHwnd(),cKey,cMask); dU04/]modD
bRegistered=FALSE; aid)q&AcQ
} { G>+.
cMask=mask; A`8}J4
cKey=key; 4#Nd;gM2
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $}h_EI6hS
return bRegistered; WZO
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} #(Yb
lY
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四、小结 ?Kz`
O>"6
RkXLE"G'
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。