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:
<[^nD>t_
62}bs/% 一、实现方法
E5lC'@D cz =*q:R9V 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:
BEM+FG -;z&"> #pragma data_seg("shareddata")
yKO84cSl HHOOK hHook =NULL; //钩子句柄
hnM|=[wM UINT nHookCount =0; //挂接的程序数目
y@AKb static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
N1Y*IkW" static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
PZ-|W static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
~Xnq(}?ok static int KeyCount =0;
[^W4%S static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
>ofS'mp #pragma data_seg()
M~7?m/Wj 4i[3|hv' 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。
O#7fkL SGH"m/ e 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:
b]mRn{r? doXd6q4H BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
N7Z&_$Bx cKey,UCHAR cMask)
T}2a~ {
-nO('(t BOOL bAdded=FALSE;
x}1(okc for(int index=0;index<MAX_KEY;index++){
'E0{zk if(hCallWnd[index]==0){
p&_a kQj hCallWnd[index]=hWnd;
P-No;/!B# HotKey[index]=cKey;
`S<uh9/ HotKeyMask[index]=cMask;
.F)b9d[? bAdded=TRUE;
Q=gVxS KeyCount++;
gSu+]N break;
2=!/)hw} }
|82V`CV }
b_Ba0h= return bAdded;
nAd
4g| }
r7*[k[^[^ //删除热键
guSgTUJ} BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/D 8cJgH- {
[ne4lWaE<y BOOL bRemoved=FALSE;
8.jd'yp*J for(int index=0;index<MAX_KEY;index++){
` M4;aN if(hCallWnd[index]==hWnd){
uzZ|w+3O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
BD=;4SLT hCallWnd[index]=NULL;
$F G4wA HotKey[index]=0;
,X\z#B HotKeyMask[index]=0;
5yxZ
5Ni! bRemoved=TRUE;
N~M:+\
KeyCount--;
Ko''G5+ break;
V%ykHo }
]pb;q(?^ }
kf-ZE$S4 }
h{<^?= return bRemoved;
K]kL?-A#' }
a+weBF#Z ,{8~TVO +-ieaF DLL中的钩子函数如下:
tk}qvW.Ii .# j)YG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>PySd"u {
0yAvAx BOOL bProcessed=FALSE;
-+Q,xxu if(HC_ACTION==nCode)
r*+9<8-ZX< {
R"O9~s6N if((lParam&0xc0000000)==0xc0000000){// 有键松开
&.(ZO] switch(wParam)
O%c6 vp7 {
X[Y!=e4z case VK_MENU:
sSD(mO<( MaskBits&=~ALTBIT;
hH[JY(V break;
i7fpl case VK_CONTROL:
O IewG5O MaskBits&=~CTRLBIT;
um3
M4>K break;
u%}vTCg*p case VK_SHIFT:
JxD@y}ZYE MaskBits&=~SHIFTBIT;
'a"<uk3DT break;
D;d;:WT5 default: //judge the key and send message
UdL`.D, break;
jjl4A}*0 }
f4g(hjETbu for(int index=0;index<MAX_KEY;index++){
]E=JUYf0 if(hCallWnd[index]==NULL)
})!n1kt continue;
3tLh{S?uJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Brpin {
~}ewna/2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
a~XNRAh bProcessed=TRUE;
mup3ua]! }
`b7o }
#Wc)wL-Tg }
Zs{ `Yf^Q else if((lParam&0xc000ffff)==1){ //有键按下
#4cuNX5m% switch(wParam)
v"$; aJ {
h/_z QR- case VK_MENU:
=G=.THRUk MaskBits|=ALTBIT;
K8ThZY% break;
'Ob5l: case VK_CONTROL:
BAKfs/N MaskBits|=CTRLBIT;
w[|!$J? break;
fp>o ^+VB case VK_SHIFT:
Hpsg[d)! MaskBits|=SHIFTBIT;
5 !NPqka}. break;
ZcdS?Z2k default: //judge the key and send message
+>:X4A* break;
Y":hb;& }
xMuy[)b for(int index=0;index<MAX_KEY;index++){
G&n_vwZ% if(hCallWnd[index]==NULL)
T:}Ed_m}q continue;
;hZ(20 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=8J\;h {
igo7F@_, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
sY#K=5R bProcessed=TRUE;
U9k}y }
cdGl[dQ/ }
YInW)My.h }
8?)Da&+f if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
=oHJ_ for(int index=0;index<MAX_KEY;index++){
{< wq }~ if(hCallWnd[index]==NULL)
Xg%zE continue;
GdP9Uj)n- if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
)O+9v}2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
iL\\JuY //lParam的意义可看MSDN中WM_KEYDOWN部分
,Y5+UzE@ }
Jq; }q63: }
BF@VgozW }
x)GoxH~# return CallNextHookEx( hHook, nCode, wParam, lParam );
|LjCtm)@+ }
HmiwpI P]x@h 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:
J$P]>By5: aY?}4Bx BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
`}=Fw0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?IWLl MR~BWH?@ 1 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Z?@07Y[|K x
Dr^&rC LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Ln:
y|t {
{C6Yr9 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
!eO?75/ {
[[|;Wr}2 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
ZcQm(my SaveBmp();
zZ wD)p?_g return FALSE;
WFdS#XfV }
kOc'@;_O …… //其它处理及默认处理
c8Opc"UE }
kjmF-\ q<UqGj7#
[v&_MQ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
jIW:O !Zwl9DX3 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
_Yhpj}KZ aL`pvsnF 二、编程步骤
{P3,jY^ ]x Kmz 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
rm
cy-}e ;L)}blN. 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
(= \P|iv |~/{lE=I 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
zz9.OnZ~ +`4|,K7' 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
'2vlfQ@8a~ E=B9FIx~< 5、 添加代码,编译运行程序。
ewLr+8 v#X? KqD 三、程序代码
H;CGLis "- Ns1A8 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
2#&K3v #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
RWoiV10 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
3HA{18{4uP #if _MSC_VER > 1000
r`krv-,O$ #pragma once
m ;KP #endif // _MSC_VER > 1000
99eS@}RC #ifndef __AFXWIN_H__
%_u3Np #error include 'stdafx.h' before including this file for PCH
a0n
F U #endif
4*54"[9Hr# #include "resource.h" // main symbols
9-@w(kMu class CHookApp : public CWinApp
?e@Ff"Y@e {
rd"]$_P8O public:
}l/md/C0 CHookApp();
J+;.t&5R // Overrides
mkWIJH // ClassWizard generated virtual function overrides
(;n|>l?* //{{AFX_VIRTUAL(CHookApp)
D"o>\Q public:
h{! @^Q virtual BOOL InitInstance();
wb{y]~&6K virtual int ExitInstance();
hsl8@=_ B //}}AFX_VIRTUAL
w7
QIKsI0 //{{AFX_MSG(CHookApp)
YgDgd\ // NOTE - the ClassWizard will add and remove member functions here.
_zOzHc? Q // DO NOT EDIT what you see in these blocks of generated code !
,4\vi| //}}AFX_MSG
'`RCNk5l DECLARE_MESSAGE_MAP()
_#L
IG2d };
dRu@5
:BP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
FCIT+8K BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
H"-p^liw BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_W!g'HP-D BOOL InitHotkey();
!Khsx BOOL UnInit();
x=H*"L= #endif
RJWlG'i ,:#prT[P" //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
!qcR5yk`2 #include "stdafx.h"
W<x2~HW( #include "hook.h"
U,]z)1#X| #include <windowsx.h>
D8h~?phK #ifdef _DEBUG
"_(o% \"7 #define new DEBUG_NEW
O,bj_CW x #undef THIS_FILE
8kqxr&,[ static char THIS_FILE[] = __FILE__;
>2wjV"W? #endif
pa+y(!G #define MAX_KEY 100
gy>2=d #define CTRLBIT 0x04
TX*P*-' #define ALTBIT 0x02
yx-{}Yj^ #define SHIFTBIT 0x01
H,uOshR #pragma data_seg("shareddata")
3wr~P HHOOK hHook =NULL;
;bZ)q UINT nHookCount =0;
J%}}(G~ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
~gV|_G static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
hwO]{)% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
`*~:nvU static int KeyCount =0;
bg$e80 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
xi.;`Q^# #pragma data_seg()
P= ]ZXj[ HINSTANCE hins;
`yVJ `}hm void VerifyWindow();
pY:xxnE BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
3rWqt //{{AFX_MSG_MAP(CHookApp)
2S/^"IM[" // NOTE - the ClassWizard will add and remove mapping macros here.
` "9Y.KU // DO NOT EDIT what you see in these blocks of generated code!
zZDr=6|r_ //}}AFX_MSG_MAP
0.Iw/e END_MESSAGE_MAP()
*D\nsJ*g 2x`#
f0[ CHookApp::CHookApp()
|g7E*1Ie {
b|xz`wUH0$ // TODO: add construction code here,
&QE* V // Place all significant initialization in InitInstance
?49wq4L;a }
Y@pa+~[{h3 TM"i9a? ; CHookApp theApp;
^beW*O! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
myXp]=Sb? {
R Jg# A` BOOL bProcessed=FALSE;
$y`|zK|G- if(HC_ACTION==nCode)
aoCyYnZD {
,@2O_O`: if((lParam&0xc0000000)==0xc0000000){// Key up
inhb> zB switch(wParam)
yCQpqh {
'QkL%z0 case VK_MENU:
"3!4 hiU9 MaskBits&=~ALTBIT;
[OMKk#vW break;
HM<V$
R case VK_CONTROL:
|"ck;.) MaskBits&=~CTRLBIT;
W<58TCd break;
mDo]5 i< case VK_SHIFT:
jIEK[vJ` MaskBits&=~SHIFTBIT;
2Ejs{KUj break;
MEo+S default: //judge the key and send message
6 C break;
xo?f90+( }
)+ S" ` for(int index=0;index<MAX_KEY;index++){
";xG[ne$Be if(hCallWnd[index]==NULL)
J4x1qY)Y&v continue;
!iZ*Z Pu if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
AR)&W/S)7, {
bluC P| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IU3OI:uq bProcessed=TRUE;
dp+wwNe }
f9#B(4Tgi }
Amz7j8zJ }
rs!J<CRq else if((lParam&0xc000ffff)==1){ //Key down
D?9=q switch(wParam)
c?[A {
R{4O*i8# case VK_MENU:
_a c_8m MaskBits|=ALTBIT;
\alRBH qE break;
b$VdTpz case VK_CONTROL:
DGp'Xx_8 MaskBits|=CTRLBIT;
sHAzg^n}r break;
eZf-i1lJ case VK_SHIFT:
"j~=YW+l MaskBits|=SHIFTBIT;
BEu9gu break;
LkJ3 :3O default: //judge the key and send message
KJSN)yn\ break;
W"z!sf5U }
#XNe4# for(int index=0;index<MAX_KEY;index++)
:#b[gWl0Ru {
+dR$;!WB3 if(hCallWnd[index]==NULL)
011 _(v continue;
6nxf<1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a*=\-;HaZ {
u},<On SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
u9'4q<>& bProcessed=TRUE;
Jw9|I)H }
DUY#RJf }
< R0c=BZ> }
<L:v2 8c if(!bProcessed){
QNn$`Qz. for(int index=0;index<MAX_KEY;index++){
XKMJsEPsW if(hCallWnd[index]==NULL)
.rax`@\8 continue;
%z1WdiC if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+5 @8't SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
5jkW@ }
zn@tLLX }
H@'Y>^z? }
O!uX:TE|Q return CallNextHookEx( hHook, nCode, wParam, lParam );
BQt!L1)) }
8h-6;x^^ #^#N%_8 BOOL InitHotkey()
g9p#v$V {
5ahAp]; if(hHook!=NULL){
PK!=3fK4\F nHookCount++;
/ ijj;9EB return TRUE;
x@ (91f }
=<R77rnY& else
efRa|7!HK hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
F5{~2~Cw( if(hHook!=NULL)
8[
:FU nHookCount++;
aFd
, return (hHook!=NULL);
0;r+E*`DA }
^vJ08gu_W BOOL UnInit()
}Geip@Ot {
|L<oKMZY if(nHookCount>1){
pOGVD nHookCount--;
{.;MsE return TRUE;
&2#<6=} }
z`m-Ca>6 BOOL unhooked = UnhookWindowsHookEx(hHook);
cM.q^{d` if(unhooked==TRUE){
X -6Se nHookCount=0;
2}'&38wMT hHook=NULL;
LKftNSkg" }
rJKX4,M return unhooked;
Fl^.J<Dz }
%\Ig{Rj; bG;vl;C BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pA"pt~6 {
auaFP-$`f BOOL bAdded=FALSE;
A&)P_B1| for(int index=0;index<MAX_KEY;index++){
U/wY;7{)# if(hCallWnd[index]==0){
y @h^ hCallWnd[index]=hWnd;
,|?B5n& HotKey[index]=cKey;
X
NnsMl HotKeyMask[index]=cMask;
Y-7x**I bAdded=TRUE;
}0}J KeyCount++;
y/4 4((O break;
Uw<Lt"ls. }
OCY7Bls4 }
cD-\fRBGK return bAdded;
N
y7VIh| }
1h"0B !A&Vg # BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
wF$8#= {
HOtays,#<} BOOL bRemoved=FALSE;
f.Q?-M for(int index=0;index<MAX_KEY;index++){
t.485L% if(hCallWnd[index]==hWnd){
<),FI <~ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]e7D"" hCallWnd[index]=NULL;
FzFY2h;n]B HotKey[index]=0;
3,S5>~R= HotKeyMask[index]=0;
(:vY:-\ bO bRemoved=TRUE;
akrEZ7A KeyCount--;
2pxl! break;
eWW\m[k]} }
=y[eQS$ }
ATPc~f }
G{YJ(6etZ return bRemoved;
SI8mr`gJ }
b?h"a<7 X];a(7+2 void VerifyWindow()
~?+Jt3?, {
cQS}pQyYN for(int i=0;i<MAX_KEY;i++){
:
R.,<DQM if(hCallWnd
!=NULL){ b"/P
if(!IsWindow(hCallWnd)){ wNcf7/ky
hCallWnd=NULL; 6 @'v6 1'
HotKey=0; 'FO^VJ;ha
HotKeyMask=0; fL'
42
KeyCount--; \62|w HX
} H [R|U
} lHT?
} &NB[:S=
} coyy T
f.,S-1D]h
BOOL CHookApp::InitInstance() !xA;(<K[^
{ {CYFM[V
AFX_MANAGE_STATE(AfxGetStaticModuleState()); f* p=]]y
hins=AfxGetInstanceHandle(); 7K%Ac
InitHotkey(); svHs&v
return CWinApp::InitInstance(); $:{uF#
} gdNEMT
[;83
IoU}
int CHookApp::ExitInstance() M,3sK!`>
{ 'HH[[9Q
VerifyWindow(); 9p9:nx\
UnInit(); b:+.Y$%F-
return CWinApp::ExitInstance(); yI)~- E.
} mj{TqF
,4)zn6tC
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file qI5_@[S*
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) TO-[6Pq#
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ E}b"
qOV
#if _MSC_VER > 1000 :-69,e
#pragma once /MosE,7l
#endif // _MSC_VER > 1000 ?qO_t;:0>
q~T*R<S
class CCaptureDlg : public CDialog */u_RJ
{ oDrfzm|[Y
// Construction zw_Xh~4"b
public: 6H53FMqr
BOOL bTray; l*e*jA_>:7
BOOL bRegistered; <V5(5gx
BOOL RegisterHotkey(); OT+=H)/
UCHAR cKey;
+ZQf$@+
UCHAR cMask; C-V,3}=*2
void DeleteIcon(); AD_")_B|i
void AddIcon(); (1^AzE%U+Z
UINT nCount; F;kY5+a7~e
void SaveBmp(); 1~zzQ:jAZ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor f(6`5/C
// Dialog Data ; $i{>mDT
//{{AFX_DATA(CCaptureDlg) )+OI}
enum { IDD = IDD_CAPTURE_DIALOG }; |A0BYzlVc
CComboBox m_Key; Hbn%CdDk1
BOOL m_bControl; M ~zA
BOOL m_bAlt; "v@Y[QI
BOOL m_bShift; z"Miy
CString m_Path; /Nt#|C>
CString m_Number; MHeUh[%(
//}}AFX_DATA WYSqnmi
// ClassWizard generated virtual function overrides @.0>gmY;:
//{{AFX_VIRTUAL(CCaptureDlg) q^; SZ^yW5
public: r'/&{?Je/
virtual BOOL PreTranslateMessage(MSG* pMsg); &kUEnwQ-
protected: $P&{DOiKS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `u$
Rd
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); X'Q?Mh
//}}AFX_VIRTUAL U6cpj
// Implementation }Z#KPI8\Q
protected: Ne#FBRu5
HICON m_hIcon; BbsgZ4
// Generated message map functions 6B`XHdCq
//{{AFX_MSG(CCaptureDlg) <+Eu.K&
virtual BOOL OnInitDialog(); !xk`oW
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i^T@jg+K
afx_msg void OnPaint(); u_H=Xm)9
afx_msg HCURSOR OnQueryDragIcon(); K</EVt,U~
virtual void OnCancel(); mh#NmW>n
afx_msg void OnAbout(); ,Ei!\U^)
afx_msg void OnBrowse(); ,2oF t\`.r
afx_msg void OnChange(); xB-\yWDZe
//}}AFX_MSG >x?x3 #SX
DECLARE_MESSAGE_MAP() ?#s9@R1
}; S:B$c>
#endif @=_4i&]$
Ig&H0S
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file zVt1Ta:j
#include "stdafx.h" d~#B,+
#include "Capture.h" ]31>0yj[Q
#include "CaptureDlg.h" {E=BFs
#include <windowsx.h> f/xQy}4+~E
#pragma comment(lib,"hook.lib") n( RQre
#ifdef _DEBUG yz}ik^T
#define new DEBUG_NEW B(|*u
#undef THIS_FILE H(?)v.%
static char THIS_FILE[] = __FILE__; R7\T.;8+
#endif ,3XlX(P
#define IDM_SHELL WM_USER+1 M$u.lI
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H 48YX(HI
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l XpbAW
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0<i8
;2KD
class CAboutDlg : public CDialog @7HHi~1JK
{ N\l|3~
public: rEHlo[7^
CAboutDlg(); NF "|*S
// Dialog Data []lMv
ZW
//{{AFX_DATA(CAboutDlg) 2dsXG$-W2
enum { IDD = IDD_ABOUTBOX }; s(Y2]X4
(
//}}AFX_DATA *82+GY]
// ClassWizard generated virtual function overrides Nl]_Ie6
//{{AFX_VIRTUAL(CAboutDlg) vh"wXu
protected: E"%dO
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t|urvoz
//}}AFX_VIRTUAL lvAKL>qX
// Implementation mzf~qV^T
protected: mzRH:HgN?
//{{AFX_MSG(CAboutDlg) >P+oNY
//}}AFX_MSG s"UUo|hM
DECLARE_MESSAGE_MAP() E-jJ!>&K
}; IM$ d~C
|.KB
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E4$y|Ni"
{ ~9y/MR
//{{AFX_DATA_INIT(CAboutDlg) hG~HV{6
//}}AFX_DATA_INIT D&o~4Qvc]
} B/*\Ih9y
*(s0X[-
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6&+}Hhe
{ p;qFMzyS9
CDialog::DoDataExchange(pDX); DH7]TRCMZ)
//{{AFX_DATA_MAP(CAboutDlg) Nwj M=GG
//}}AFX_DATA_MAP llN/
} I5*<J n
99\lZ{f(
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) n8E3w:A-
//{{AFX_MSG_MAP(CAboutDlg) shD4";8*@
// No message handlers xS4?M<|L63
//}}AFX_MSG_MAP 4T6: C?V
END_MESSAGE_MAP() Mp QsM-iW
AJ>$`=
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #<y/m*Ota
: CDialog(CCaptureDlg::IDD, pParent) l)e6*sDZ,
{ ev#/v:$?
//{{AFX_DATA_INIT(CCaptureDlg) |!81M|H
m_bControl = FALSE; l_s#7 .9$
m_bAlt = FALSE; 4k9$'
k
m_bShift = FALSE; ^6gEL~m|]
m_Path = _T("c:\\"); d}aMdIF!e
m_Number = _T("0 picture captured."); LSR0yCU
nCount=0; `,O"^zR)z
bRegistered=FALSE; 'C=(?H)M
bTray=FALSE; qpQiMiB#g'
//}}AFX_DATA_INIT Rh!m1Q(-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 TS`m&N{i")
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !3<b#QAXRG
} .+mP#<mAg
p' 6h9/
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1Vkb}A,'
{ ^ ;K"Y'f$
CDialog::DoDataExchange(pDX); aeVd.`lxM
//{{AFX_DATA_MAP(CCaptureDlg) M+M ;@3
DDX_Control(pDX, IDC_KEY, m_Key); 1h|qxYO
DDX_Check(pDX, IDC_CONTROL, m_bControl); #]QS
DDX_Check(pDX, IDC_ALT, m_bAlt); gil:SUW1r
DDX_Check(pDX, IDC_SHIFT, m_bShift); sOVpDtZ]LR
DDX_Text(pDX, IDC_PATH, m_Path); S'`G7ht
DDX_Text(pDX, IDC_NUMBER, m_Number); :fDzMD
//}}AFX_DATA_MAP W0;QufV
} AHMvh 7O?
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MskOPg
//{{AFX_MSG_MAP(CCaptureDlg) *%\Xw*\0
ON_WM_SYSCOMMAND() 0$NzRPbH
ON_WM_PAINT() ul
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ON_WM_QUERYDRAGICON() qJJ
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ON_BN_CLICKED(ID_ABOUT, OnAbout) )y6
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I %sw(uoE
ON_BN_CLICKED(ID_CHANGE, OnChange) 4`'Rm/)
//}}AFX_MSG_MAP 6kMEm)YjT
END_MESSAGE_MAP() {t4':{Y+
$m-C6xC/
BOOL CCaptureDlg::OnInitDialog() {MN6JGb|'
{ R6`mmJ+'
CDialog::OnInitDialog(); ?)[=>Kp
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3''Uxlo\
ASSERT(IDM_ABOUTBOX < 0xF000); @+_pj.D
CMenu* pSysMenu = GetSystemMenu(FALSE); +3M1^:
if (pSysMenu != NULL) M04u>|
,
{ 5!wjYQt3
CString strAboutMenu; 7*%}=.
strAboutMenu.LoadString(IDS_ABOUTBOX); xIV#}z0
if (!strAboutMenu.IsEmpty()) *=]UWM~]
{ e|>@ >F]K
pSysMenu->AppendMenu(MF_SEPARATOR); +6~zMKp
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,,1y0s0`
} &|h9L' mr
} C!nbl+75
SetIcon(m_hIcon, TRUE); // Set big icon +;*4.}
SetIcon(m_hIcon, FALSE); // Set small icon kpy)kS
m_Key.SetCurSel(0); aI|X~b
RegisterHotkey(); :T>OJ"p
CMenu* pMenu=GetSystemMenu(FALSE); 5Q:49S47
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);
f+.sm
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Su[(IMw
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); * *oDQwW]*
return TRUE; // return TRUE unless you set the focus to a control b7">IzAe
} '*Tt$0#o
fN21[Jv3
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +bR|;b(v
{ ^rO!-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Zlt,Us`
{ T-iQ!D~
CAboutDlg dlgAbout; _ /Eg_dQ~@
dlgAbout.DoModal(); -s7!:MB%g
} *.VNyay
else -G'3&L4
D
{ *y` (^kyS
CDialog::OnSysCommand(nID, lParam); )c 79&S
} 2z AxGX
} FF7?|V!Q
s;[=B
void CCaptureDlg::OnPaint() :QHh;TIG=<
{ 'F:Tv[qx
if (IsIconic()) L$"pk{'
{ 5d# 73)x$
CPaintDC dc(this); // device context for painting Gv[(0
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !9.\A:G
// Center icon in client rectangle F}@]Lq+
int cxIcon = GetSystemMetrics(SM_CXICON); J$T(p%
int cyIcon = GetSystemMetrics(SM_CYICON); _Kh8
<$h
CRect rect; I*g[Y=
GetClientRect(&rect); O*n@!ye
int x = (rect.Width() - cxIcon + 1) / 2; 2E!Q5 l!j
int y = (rect.Height() - cyIcon + 1) / 2; V^><
=DNE
// Draw the icon xJFcW+
dc.DrawIcon(x, y, m_hIcon); {h.j6
} 64<*\z_
else N-Bw&hEZ
{ #/_ VY.
CDialog::OnPaint(); u_8Z^T
} T&:~=
} v_pFI8Cz)
-3m!970
HCURSOR CCaptureDlg::OnQueryDragIcon() ~~m(CJ4S
{ 5aXE^.`
return (HCURSOR) m_hIcon; qd~9uo&[Ig
} YOA)paq+
m6A\R KJ'
void CCaptureDlg::OnCancel() k 6i&NG6
{ 1F+JyZK}w
if(bTray) Ht]O:io`
DeleteIcon(); R:f ,g2
CDialog::OnCancel(); ,s:viXk
} g'2;///
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void CCaptureDlg::OnAbout() ,e
GF~
{ O.8k [Ht
CAboutDlg dlg; lvLz){
dlg.DoModal(); PY&mLux%
} eax"AmO
:-(qqC:
void CCaptureDlg::OnBrowse() \Xr*1DI<
{ ["<'fq;PJ
CString str; QiJ
BROWSEINFO bi; Dz8aJ6g
char name[MAX_PATH]; (Ap?ixrR_
ZeroMemory(&bi,sizeof(BROWSEINFO)); >Pvz5Hf/wW
bi.hwndOwner=GetSafeHwnd(); b"B:DDw00
bi.pszDisplayName=name; iqN?'8
bi.lpszTitle="Select folder"; *9EW&Ek
bi.ulFlags=BIF_RETURNONLYFSDIRS; 3UUN@Tx
LPITEMIDLIST idl=SHBrowseForFolder(&bi); EG3u)}vI
if(idl==NULL) kdhwnO
return; o%0To{MAF-
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y!
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str.ReleaseBuffer(); GR_caP
m_Path=str; %joU}G;"
if(str.GetAt(str.GetLength()-1)!='\\') jvo^I$|2h
m_Path+="\\"; Zq5~M bldh
UpdateData(FALSE); H5o=nWQ6e
} fVdu9 l
v2="j
void CCaptureDlg::SaveBmp() 'rA(+-.M;
{ MIh\z7gW
CDC dc; w6pXF5ur>
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ntW1 )H'o
CBitmap bm; aK
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int Width=GetSystemMetrics(SM_CXSCREEN); $+$l?2
int Height=GetSystemMetrics(SM_CYSCREEN); *dPbV.HCl
bm.CreateCompatibleBitmap(&dc,Width,Height); }]JHY P\
CDC tdc; ~@#a*="
tdc.CreateCompatibleDC(&dc); z%\&n0
CBitmap*pOld=tdc.SelectObject(&bm); \1QY=}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9Hd_sNUu\
tdc.SelectObject(pOld); 2waPNb|
BITMAP btm; %.onO0})
bm.GetBitmap(&btm); 'g3T'2"`5
DWORD size=btm.bmWidthBytes*btm.bmHeight; g!9|1z
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fPPmUM^C9
BITMAPINFOHEADER bih; gYe6(l7m
bih.biBitCount=btm.bmBitsPixel; 3xiDt?&H
bih.biClrImportant=0; .8T0OQ4
bih.biClrUsed=0; G\B+bBz
bih.biCompression=0; S5d
bih.biHeight=btm.bmHeight; nd7g8P9p
bih.biPlanes=1;
Lw%_xRn)
bih.biSize=sizeof(BITMAPINFOHEADER); 3rjKwh7
bih.biSizeImage=size;
qI${7
bih.biWidth=btm.bmWidth; mrr~ #Bb>
bih.biXPelsPerMeter=0; 4u"Bll
bih.biYPelsPerMeter=0; DuIXv7"[
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); GR4DxlX
static int filecount=0; z,4 D'F&
CString name; G=SMz+z
name.Format("pict%04d.bmp",filecount++); `uH7~ r^
name=m_Path+name; [m%]C
BITMAPFILEHEADER bfh; DUh\x>^
bfh.bfReserved1=bfh.bfReserved2=0; d325Cw?
bfh.bfType=((WORD)('M'<< 8)|'B'); ivyaGAF}+o
bfh.bfSize=54+size; Aa4Tq2G
bfh.bfOffBits=54; -4zV
yW
S<
CFile bf; K[LuvS
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1j:aGj>{
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;{q*
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); D9?.Ru0.
bf.WriteHuge(lpData,size); i];P!Gm
bf.Close(); aT(_c/t.
nCount++; qmt9J?$k
} )*S:C
GlobalFreePtr(lpData); %OHZOs
if(nCount==1) XM,slQ
m_Number.Format("%d picture captured.",nCount); OZnKJ<
else w,$qsmR
m_Number.Format("%d pictures captured.",nCount); @un+y9m[C
UpdateData(FALSE); 5j6`W?|q
} 75lh07
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -]H~D4ng
{ ?Ve IlD
if(pMsg -> message == WM_KEYDOWN) -Ou.C7ol
{ ?Rx(@
if(pMsg -> wParam == VK_ESCAPE) *8/Xh)B;
return TRUE; H(r D*R[
if(pMsg -> wParam == VK_RETURN) j7k}!j_O{
return TRUE; y& 1@d+Lf
} ne/JC(
return CDialog::PreTranslateMessage(pMsg); AyOibnoZ2E
} 9|#cjHf
Z>Mv$F"p:
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5UO+c(T
{ Mjy:k|aY"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ S!.sc
SaveBmp(); p2{7+m
return FALSE; Jt@lH
} @XV&^l-
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h%Nd89//
CMenu pop; ]b!n ;{5
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .t5.(0Xk[A
CMenu*pMenu=pop.GetSubMenu(0); dQ.#8o=
pMenu->SetDefaultItem(ID_EXITICON); &|~7`
CPoint pt; IrqM_OjC
GetCursorPos(&pt); L2ydyXIsd
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); !}#> ky!t
if(id==ID_EXITICON) dD=$$(
je
DeleteIcon(); 7RL J
else if(id==ID_EXIT) -HG.GA
OnCancel(); :aej.>I0
return FALSE; <f>w"r
} %+N]$Q
LRESULT res= CDialog::WindowProc(message, wParam, lParam); pOc2V
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) L(VFzPkY%
AddIcon(); f
+{=##'0
return res; O -1O@:}c
} K)7T]z`
fRQ,Z
void CCaptureDlg::AddIcon() iZ-R%- }B
{ L7-BuW}&
NOTIFYICONDATA data; nn_O"fZi
data.cbSize=sizeof(NOTIFYICONDATA); P1Hab2%+
CString tip; J rx^
tip.LoadString(IDS_ICONTIP); ?,>3uD#
data.hIcon=GetIcon(0); u
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data.hWnd=GetSafeHwnd(); 4,I,f>V
strcpy(data.szTip,tip); XB7Aa)
data.uCallbackMessage=IDM_SHELL; -G~]e6:zD
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; wUv?;Y$C
data.uID=98; QxYm3x5
Shell_NotifyIcon(NIM_ADD,&data); 'f\9'v
ShowWindow(SW_HIDE); pAE
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bTray=TRUE; '[
t.
} s6,~JF^
w}xA@JgQ%
void CCaptureDlg::DeleteIcon() R| ?Q&F_$
{
'"B
NOTIFYICONDATA data; i%K6<1R;y{
data.cbSize=sizeof(NOTIFYICONDATA); u}@N
Qeg
data.hWnd=GetSafeHwnd(); &Hb%Q! ^Kb
data.uID=98; ]<;7ZNG"Y5
Shell_NotifyIcon(NIM_DELETE,&data); 4X+xh|R:U
ShowWindow(SW_SHOW); {N4 'g_
SetForegroundWindow(); W"c\/]aD
ShowWindow(SW_SHOWNORMAL); E>bkEm
bTray=FALSE; IVNH.g'
} ,*|Q=
GW,EyOE+~
void CCaptureDlg::OnChange() Q,3kaR@O
{ )p\`H;7*V4
RegisterHotkey(); ywwA,9~
} d&+]@ Ii
#
e?B
BOOL CCaptureDlg::RegisterHotkey() 9\Jc7[b
{ 4z<c8
E8
UpdateData(); m!FuC=e
UCHAR mask=0; n
_K1%
UCHAR key=0; /~NX<Ye&
if(m_bControl) ZNBowZI
mask|=4; JwSF}kNs}
if(m_bAlt) 2;v:Z^&
mask|=2; R-Edht|{
if(m_bShift) t2dsYU/
mask|=1; fd'kv
key=Key_Table[m_Key.GetCurSel()]; X:i?gRy"
if(bRegistered){ \?n6l7*t>
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Kv@P Uzu
bRegistered=FALSE; <XLae'R
} 0AO^d[v
cMask=mask; ~+\=X`y
cKey=key; dmF=8nff
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M/o?D <'
return bRegistered; eK7A8\;e
} >=N-P<%
:!aLa}`@
四、小结 fpf]qQ
W~7
|m's)
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。