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:
^DHFP-G?e
x]%e_ 一、实现方法
&0TOJ:RP / /qTMxn 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:
I/9ZUxQCyG zQxZR}' #pragma data_seg("shareddata")
iR4CY- HHOOK hHook =NULL; //钩子句柄
_,b%t1v UINT nHookCount =0; //挂接的程序数目
7dX1.}M<( static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
/s6':~4 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
mLD0Lu_Ob3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
1W-t})!a static int KeyCount =0;
cWgiFv static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
9A\J*OU #pragma data_seg()
kgK7 T WX
79V 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。
ltt%X].[ >82Q!HaH 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:
E?&dZR 'q1)W' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
?7G?uk]3,@ cKey,UCHAR cMask)
xXZ$#z\Z, {
{Cs~5jYz BOOL bAdded=FALSE;
G5zZf~r for(int index=0;index<MAX_KEY;index++){
ksY^w+>(! if(hCallWnd[index]==0){
-w 2!k hCallWnd[index]=hWnd;
!'ajpK HotKey[index]=cKey;
5@j?7%_8 HotKeyMask[index]=cMask;
@okC":Fw, bAdded=TRUE;
.eXIbd<C KeyCount++;
Q"VFcp: break;
/{7x|ay] }
? $pGG }
%xLziF return bAdded;
FHM^x2 }
*ok89ad //删除热键
({![ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ix^:qw; {
2DTH|Yv BOOL bRemoved=FALSE;
j3`:;'L for(int index=0;index<MAX_KEY;index++){
^]wm Y if(hCallWnd[index]==hWnd){
4'+/R%jk" if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_@sqCf%| hCallWnd[index]=NULL;
OjMDxG
w HotKey[index]=0;
7r"!&P*, HotKeyMask[index]=0;
9|jIrS%/~ bRemoved=TRUE;
_w+sx5
KeyCount--;
rf;R"Uc break;
VjYfnvE }
(5-"5<-@R }
zDa*n:S }
XnWr~h{b return bRemoved;
{FQ
dDIj# }
oX3Q9) xi;SKv;p z^~uq: DLL中的钩子函数如下:
S_c#{4n peGXU/5.I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
T>n,@?#K {
1$@k@*u\ BOOL bProcessed=FALSE;
GOH@|2N if(HC_ACTION==nCode)
3KB)\nF#% {
L)Un9&4L if((lParam&0xc0000000)==0xc0000000){// 有键松开
y+Q!4A switch(wParam)
p`{<q
- {
Fxv~;o# case VK_MENU:
@Z@yI2#e MaskBits&=~ALTBIT;
5[I> l break;
jSVb5P case VK_CONTROL:
.d8) * MaskBits&=~CTRLBIT;
6JRee[ break;
`ZV;Le' case VK_SHIFT:
d^]wqn pf MaskBits&=~SHIFTBIT;
Ow//#: break;
X@x:
F|/P default: //judge the key and send message
pl fz)x3 break;
X~GZI*P }
&xH>U*c for(int index=0;index<MAX_KEY;index++){
f=~@e#U if(hCallWnd[index]==NULL)
i-sE\m continue;
xZ`t~4qR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]}>GUXe)^ {
<%pi*:E| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
jE2ziK bProcessed=TRUE;
J[LGa:`` }
axU!o /m> }
aeSy,: }
J>hl&J else if((lParam&0xc000ffff)==1){ //有键按下
h]@Xucc switch(wParam)
@!%<JZEz3 {
e
yTYg case VK_MENU:
Gjy'30IF MaskBits|=ALTBIT;
Duptles break;
vU{ZB^+&6o case VK_CONTROL:
2Y 6/,W MaskBits|=CTRLBIT;
a^Zn
}R r break;
4pA<s- case VK_SHIFT:
#J2856bzS MaskBits|=SHIFTBIT;
j?w7X?1( break;
D
?,P\cp default: //judge the key and send message
|r0j>F break;
zb9d{e }
4D\_[(P for(int index=0;index<MAX_KEY;index++){
A|RAMO@le if(hCallWnd[index]==NULL)
4Iy\
continue;
J|6aa if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0pkU1t~9 {
Mv4JF(,S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Qt>yRt bProcessed=TRUE;
8VMq>- }
.V/TVz!b }
^o?.Rph|i] }
ctt5t if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
;C{2*0"H| for(int index=0;index<MAX_KEY;index++){
u=rY if(hCallWnd[index]==NULL)
kP8Ypw& continue;
/#>?wy<s~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
X/gh>MJJ< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
",Q \A I //lParam的意义可看MSDN中WM_KEYDOWN部分
!EpP-bq'* }
Grjm9tbX} }
CUxSmN2[ }
#+Vvf return CallNextHookEx( hHook, nCode, wParam, lParam );
JvHJ*E }
l[\[)X3$ 0dIJgKanGP 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:
|&RdOjw$u ,3fw"P$ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
mGL%<4R, BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0JNG\ARC d6hWmZVC 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:
P\N`E?lJL g-*@I`k[ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
3QV|@5L`[ {
.' .|s?s if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
sF|<m)Kt{W {
zhN'@Wj'_ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Iupk+x> SaveBmp();
yRvq3>mU return FALSE;
OSkZW }
(#Y2H …… //其它处理及默认处理
R_@yj]%H= }
(5G^"Srw %f{kT<XHu +;cw<9%0 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。
Yj0Ss{Ep Pi+,y 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。
U4LOe}Ny aNXu"US+Sp 二、编程步骤
%X[|7D- _Dk;U*2 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";
zD) 2af b,318R8+G 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
n$b/@hp$z 6"A|)fz 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;
1YM04*H GhpH7%s 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;
/ebYk-c Xv:<sX 5、 添加代码,编译运行程序。
UTs0=:+,t Mw+]* 三、程序代码
WgxlQXi-B 39m# ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
bR;H@Fdg? #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
@@# G. #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
8Cm^#S,+ #if _MSC_VER > 1000
{W0]0_mI( #pragma once
Ko -<4wu #endif // _MSC_VER > 1000
yiI&>J)) #ifndef __AFXWIN_H__
qvYw[D#. #error include 'stdafx.h' before including this file for PCH
!T
@|9PCp #endif
:5CwRg #include "resource.h" // main symbols
M>T#MDK\( class CHookApp : public CWinApp
Gm>8=
=c {
Bxm^Arc> public:
elP`5BuN CHookApp();
40q8,M // Overrides
U 2\{(y // ClassWizard generated virtual function overrides
U<#i\4W //{{AFX_VIRTUAL(CHookApp)
DQ'+,bxk=9 public:
vx-u+/\ virtual BOOL InitInstance();
P5aHLNit virtual int ExitInstance();
gQ/zk3?k //}}AFX_VIRTUAL
k (
R //{{AFX_MSG(CHookApp)
-M[5K/[ // NOTE - the ClassWizard will add and remove member functions here.
k`TEA?RfQ // DO NOT EDIT what you see in these blocks of generated code !
yl3iU:+V //}}AFX_MSG
t0?BU~f DECLARE_MESSAGE_MAP()
-JUv'fk };
0 ]NsT0M LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
UGR5ILf BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
b/S4b BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]p#Zdm1EL BOOL InitHotkey();
KN+*_L- BOOL UnInit();
TXy*- <#vR #endif
5(DCq(\P* R8HA X //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
*(r85lEou) #include "stdafx.h"
p]pFZ";70 #include "hook.h"
m0\(a_0V #include <windowsx.h>
qe\j$Cjy #ifdef _DEBUG
Wxp^*._q3I #define new DEBUG_NEW
^. Pn)J #undef THIS_FILE
]HCt%5 static char THIS_FILE[] = __FILE__;
]A'e+RD4k #endif
nre8 F #define MAX_KEY 100
Grw_SVa^ #define CTRLBIT 0x04
;GE0iSC #define ALTBIT 0x02
&|9?B!,` #define SHIFTBIT 0x01
1` 9/[2z #pragma data_seg("shareddata")
rVf`wJ6b HHOOK hHook =NULL;
$1UN?(r UINT nHookCount =0;
w1s#8: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
?|8H$1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Z"E+ TX static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
2Jj`7VH> static int KeyCount =0;
N*o+m~:y static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&O!d!Pf #pragma data_seg()
flmcY7ZV HINSTANCE hins;
8K1+ttjm void VerifyWindow();
ZY][LU~l8 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Vxk0oIk` //{{AFX_MSG_MAP(CHookApp)
R?]>8o, // NOTE - the ClassWizard will add and remove mapping macros here.
*W i(% // DO NOT EDIT what you see in these blocks of generated code!
eL-92]]e //}}AFX_MSG_MAP
W 6jB!W END_MESSAGE_MAP()
!0zM@p @zPWu}&m CHookApp::CHookApp()
n287@Y4Ru {
&f!!UZMt) // TODO: add construction code here,
~[,E
i k // Place all significant initialization in InitInstance
Ie+z"&0 }
OGae]O< ^(6.P)$ CHookApp theApp;
4I2ppz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
zM)o^Fn2 {
vguqk!eo4 BOOL bProcessed=FALSE;
|r3eq4$Am if(HC_ACTION==nCode)
,@>B#%Nz {
r5F#q if((lParam&0xc0000000)==0xc0000000){// Key up
y6G[-?"/Q switch(wParam)
R4qS,2E {
*9*I:Uh57 case VK_MENU:
V:IoeQ]- MaskBits&=~ALTBIT;
E7j]"\~ i break;
|pJ.73 case VK_CONTROL:
[.6uw=;o MaskBits&=~CTRLBIT;
jPbL3"0A& break;
U8.DPRa case VK_SHIFT:
5@Rf]'1B0 MaskBits&=~SHIFTBIT;
0ED(e1K#B break;
f#5mX&j default: //judge the key and send message
sg9ZYWcL break;
s[Njk@y, }
J)o~FC]b* for(int index=0;index<MAX_KEY;index++){
uRUysLIw if(hCallWnd[index]==NULL)
6i&WF<%D continue;
w+ _'BU1# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
rKR<R(=!= {
2M|jWy _ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
r)*KgGsk bProcessed=TRUE;
9fe~Q%x=u }
2"%d!" }
N!btj,vx }
&;C|=8eB else if((lParam&0xc000ffff)==1){ //Key down
WRD^S:`BH switch(wParam)
;1F3.ibE {
Ba@UX(t case VK_MENU:
}.e*=/"MB MaskBits|=ALTBIT;
?2.<y_1 break;
3pl.<;9r case VK_CONTROL:
^8We}bs-c MaskBits|=CTRLBIT;
Z;Tjjws break;
4J_18.JHP case VK_SHIFT:
h`jtmhoz MaskBits|=SHIFTBIT;
,wnF]K2D0 break;
i\,#Z! default: //judge the key and send message
<;_X=s`f, break;
9/Q5(P }
`bivAL for(int index=0;index<MAX_KEY;index++)
v`nodI {
iiO4.@nT if(hCallWnd[index]==NULL)
;l~gA |A continue;
w'cZ\<N[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|%TH|?kB {
-KOE2f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
VIynlvy bProcessed=TRUE;
!_zmm$bR
}
g3"`b)M }
|-Y,:sY: }
9g "?`_ if(!bProcessed){
9n44 *sZ for(int index=0;index<MAX_KEY;index++){
`_z8DA}E if(hCallWnd[index]==NULL)
Riu0;U( \ continue;
GndF!#?N( if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
o3%Gc/6% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
^bS&[+9E }
My=p>{s }
_%"/I96' }
-CxaOZG return CallNextHookEx( hHook, nCode, wParam, lParam );
)<jj O }
Ue~M.LZb |?{Zx&yUw BOOL InitHotkey()
?2DYz"/') {
}0qgvw if(hHook!=NULL){
N{oD1% nHookCount++;
$FCLo8/= return TRUE;
Jf4D">h }
`"/@LUso else
>'E'Mp. hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Fe`$mtPu . if(hHook!=NULL)
Ns&SZO nHookCount++;
"4i(5|whp? return (hHook!=NULL);
S,qsCnz }
_[IN9ZC 2G BOOL UnInit()
6?(*:}Q {
}&EPH}V2n if(nHookCount>1){
MJDFm, nHookCount--;
}6ec2I%`o return TRUE;
keCM}V`?" }
J`V7FlM BOOL unhooked = UnhookWindowsHookEx(hHook);
\$GlB+ iCx if(unhooked==TRUE){
vvdC.4O nHookCount=0;
W
aks*^| hHook=NULL;
:'a |cjq }
>L5[dkg% return unhooked;
z l@
<X0q }
/ey}#SHm, 8 w^i BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;/
WtO2 {
@k ~Xem%< BOOL bAdded=FALSE;
:\gdQG for(int index=0;index<MAX_KEY;index++){
;h3c+7u1 if(hCallWnd[index]==0){
&P,8)YA hCallWnd[index]=hWnd;
wVV'9pw} HotKey[index]=cKey;
M0 =K#/ HotKeyMask[index]=cMask;
O z]iHe bAdded=TRUE;
k q_B5L ? KeyCount++;
,Cde5A{K break;
[7Q |vu }
~B|K]&/] }
-hyY5!rD return bAdded;
M~p=OM< }
7n}J}8Y*U2 2NqlE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
kf.w:X"i {
-=QA{n BOOL bRemoved=FALSE;
oB#KR1
>%7 for(int index=0;index<MAX_KEY;index++){
^Jsx^? if(hCallWnd[index]==hWnd){
jt=mK,% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r1JKTuuo hCallWnd[index]=NULL;
?neXs-'-p HotKey[index]=0;
*)H?d HotKeyMask[index]=0;
mGwBbY+5n bRemoved=TRUE;
7WKb|
/#; KeyCount--;
_}{C?611c break;
.$L'Jt2X }
p.gi8%f` }
i|y8n7c }
\:%e 6M return bRemoved;
" :@5|4qK }
$yLsuqB} cZPv6c_w void VerifyWindow()
DXsp 2 {
349W0>eOT for(int i=0;i<MAX_KEY;i++){
k7'B5zVd if(hCallWnd
!=NULL){ ;| )&aTdH
if(!IsWindow(hCallWnd)){ nsuK{8}@
hCallWnd=NULL; t1wNOoRa
HotKey=0; %N=-i]+Id
HotKeyMask=0; oj;Rh!O
KeyCount--; josc
} $0+AR)
} {D 9m//x
} G;>b}\Ng
} 9jCn|+
d [6[3B
BOOL CHookApp::InitInstance() w0q.cj@nd
{ xOt%H\*k"
AFX_MANAGE_STATE(AfxGetStaticModuleState()); AKzhal!
hins=AfxGetInstanceHandle(); :Fm;0R@/k
InitHotkey(); N/4`afiV.
return CWinApp::InitInstance();
'n6D3Vse
} sy0|=E*;8"
Fr`"XH
int CHookApp::ExitInstance() PsjSL8]
{ ,W'`rCxJ
VerifyWindow(); !c4pFQ B
UnInit(); "6[fqW65
return CWinApp::ExitInstance(); 5k)/SAU0
} a;r,*zZ="
jhr:QS/9
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file x9hkE!{8
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)
ocotO
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5RrzRAxq
#if _MSC_VER > 1000 {r yv7G
#pragma once &"p7X>bd
#endif // _MSC_VER > 1000 >ZTRwy`_(
XJ^dX]4
class CCaptureDlg : public CDialog D
C{l.a.
{ b MZ-{<+i
// Construction ]4^9Tw6
_b
public: ds}: t.3}6
BOOL bTray; ]+u`E
BOOL bRegistered; lZCTthr\
BOOL RegisterHotkey(); w@ALl#z;}
UCHAR cKey; IlJ!jq
UCHAR cMask; nYhI0q
void DeleteIcon(); lyc
]E
9
void AddIcon(); 1MkQ$v7m
UINT nCount; wJ,l"bnq
void SaveBmp(); dfAnO F"-
CCaptureDlg(CWnd* pParent = NULL); // standard constructor P-[6'mw`
// Dialog Data Ha>Hb`
//{{AFX_DATA(CCaptureDlg) Ka%u#};
enum { IDD = IDD_CAPTURE_DIALOG }; KzZ|{!C
CComboBox m_Key; X0wvOs:
BOOL m_bControl; <$7HX/P
BOOL m_bAlt; ;~CAHn|Fe
BOOL m_bShift; ve|ig]$5g<
CString m_Path; `!V=~"ve
CString m_Number; J$Uj@M
//}}AFX_DATA mwU|Hh)N]
// ClassWizard generated virtual function overrides !6{; z/Hy
//{{AFX_VIRTUAL(CCaptureDlg) Gi]R8?M
public: wK>a&`<
virtual BOOL PreTranslateMessage(MSG* pMsg); us%dw&
protected: 2l^hnog|
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VJviX[V?4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); F6^Xi"R[
//}}AFX_VIRTUAL _=!Rl#
// Implementation lKKg n{R
protected: "jS@ug
HICON m_hIcon; %xv }
// Generated message map functions j
N":9+F
//{{AFX_MSG(CCaptureDlg) &m<:&h& b
virtual BOOL OnInitDialog(); di$\\ Ah
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); HG
kL6o=
afx_msg void OnPaint(); S<fSoU+RJ
afx_msg HCURSOR OnQueryDragIcon(); *L7&P46
virtual void OnCancel(); onqfmQ,3E
afx_msg void OnAbout(); as%@dUK?
afx_msg void OnBrowse(); 1fajTT?
afx_msg void OnChange(); %{"v^4
//}}AFX_MSG E "9`
DECLARE_MESSAGE_MAP() t*J*?Ma
}; XLQt>y)
#endif ul@G{N{L
2aj9:S
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file p8gm=
#include "stdafx.h" g}\G@7Q
#include "Capture.h" xb8S)zO]Q
#include "CaptureDlg.h" ]c/k%]o~
#include <windowsx.h> A><w1-X&=o
#pragma comment(lib,"hook.lib") "L ,)4v/J
#ifdef _DEBUG % \N52
#define new DEBUG_NEW [9N>*dKB
#undef THIS_FILE !C]2:+z-MF
static char THIS_FILE[] = __FILE__; lJlyfN
#endif <yt|!p-tS
#define IDM_SHELL WM_USER+1 #7(?B{i
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "wqN,}bj\
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^/c v8M=
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aUZh_<@
class CAboutDlg : public CDialog Sr Vo0$5)
{ =*2_B~`
public: *z852@
CAboutDlg(); Vd%%lv{v
// Dialog Data ~F; ~
//{{AFX_DATA(CAboutDlg) dbVMG-z8
enum { IDD = IDD_ABOUTBOX }; ou V%*<Ki
//}}AFX_DATA B=!&rKF
// ClassWizard generated virtual function overrides <?8aM7W7
//{{AFX_VIRTUAL(CAboutDlg) z.d1>w
protected: `_;sT8
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WZh%iuI{C
//}}AFX_VIRTUAL D_s0)|j$cy
// Implementation L[s7q0 F`l
protected: z:gp\
//{{AFX_MSG(CAboutDlg) "2m (*+
//}}AFX_MSG OS-
Xh-:z
DECLARE_MESSAGE_MAP() zv.R~lMtY
}; $tm%=g^
@}{lp'8FYi
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .R";2f3
{ ~9ZW~z'
//{{AFX_DATA_INIT(CAboutDlg) "/ 9EUbca
//}}AFX_DATA_INIT &d,!^9
} ue8"_N
h&|PHI
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Mn>/\e
{ a%g |E'\Jw
CDialog::DoDataExchange(pDX); O-uno{Fd*
//{{AFX_DATA_MAP(CAboutDlg) (g HCu
//}}AFX_DATA_MAP ^osXM`
} $:l>g)c
A.YXK%A%
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E&z`BPd
//{{AFX_MSG_MAP(CAboutDlg) Vf*Z }'
// No message handlers or<n[<D-C
//}}AFX_MSG_MAP iY[+BI:
END_MESSAGE_MAP() 3bU(ea^e$
Bz+zEXBC
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) MJ?fMR@
: CDialog(CCaptureDlg::IDD, pParent) BG&XCn5g|
{ VY1&YR}Y
//{{AFX_DATA_INIT(CCaptureDlg) ,h<xL-
m_bControl = FALSE; kN~:Bh$
m_bAlt = FALSE; d}:eLC
m_bShift = FALSE; <6rc8jYz
m_Path = _T("c:\\"); [aS<u`/g|
m_Number = _T("0 picture captured."); OL%KAEnD
nCount=0; ,%=SO 82W
bRegistered=FALSE; rGDx9KR4K!
bTray=FALSE; T%Nm
//}}AFX_DATA_INIT '-KYeT\;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 14DHU
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7ciSIJ
} ;}>g/lw
wJAJ /
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *DUP$@}k
{ =:"wU
CDialog::DoDataExchange(pDX); gVscdg5
//{{AFX_DATA_MAP(CCaptureDlg) je#OV,uHM
DDX_Control(pDX, IDC_KEY, m_Key); !E@4^A80\W
DDX_Check(pDX, IDC_CONTROL, m_bControl); UURYK~$K:
DDX_Check(pDX, IDC_ALT, m_bAlt); `qs[a}%'>"
DDX_Check(pDX, IDC_SHIFT, m_bShift); oE.59dx
DDX_Text(pDX, IDC_PATH, m_Path); G^%FP!'D?
DDX_Text(pDX, IDC_NUMBER, m_Number); 0d|DIT#>?
//}}AFX_DATA_MAP =F<bAZ
} 7TU(~]Z
S*3*Q l*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &l8eljg
//{{AFX_MSG_MAP(CCaptureDlg) }nx5
ON_WM_SYSCOMMAND() 1Qk]?R/DN
ON_WM_PAINT() 7cQFH@SC
ON_WM_QUERYDRAGICON() ?se\?q
ON_BN_CLICKED(ID_ABOUT, OnAbout)
zB68%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Da3Z>/S
ON_BN_CLICKED(ID_CHANGE, OnChange) tv 7"4$T
//}}AFX_MSG_MAP 4`[2Te>
END_MESSAGE_MAP() 2{}8_G
5._1G| 3
BOOL CCaptureDlg::OnInitDialog() $a#-d;
{ Fm#`}K_
CDialog::OnInitDialog(); T0e- X
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); , G2(l
ASSERT(IDM_ABOUTBOX < 0xF000); dTrz7ayH
CMenu* pSysMenu = GetSystemMenu(FALSE); [,0[\NC
if (pSysMenu != NULL) Kl/n>qEt
{ UbDpSfub
CString strAboutMenu; -]. a0
strAboutMenu.LoadString(IDS_ABOUTBOX); Dbg,|UH
if (!strAboutMenu.IsEmpty()) v$)ZoM6E
{ :B7dxE9[r
pSysMenu->AppendMenu(MF_SEPARATOR); L/c`t7
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /6{P
?)]pE
} aN?^vW<
} ?RPVd8PUhN
SetIcon(m_hIcon, TRUE); // Set big icon =1r!'<"h
SetIcon(m_hIcon, FALSE); // Set small icon +4g H=6
m_Key.SetCurSel(0);
NIh?2w"\
RegisterHotkey(); S
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CMenu* pMenu=GetSystemMenu(FALSE); ,^1B"#0{C<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6>NK2} `
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ){I!orQ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "$#<+H>O
return TRUE; // return TRUE unless you set the focus to a control A4{p(MS5
} 91\Sb:>
oJ.5! Kg
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Whl^~$+f
{ q}|_]R_y
if ((nID & 0xFFF0) == IDM_ABOUTBOX) O|AY2QH\
{ =&t]R?
F
CAboutDlg dlgAbout; kyH0J[/n
dlgAbout.DoModal();
9)*218.
} Am@:<J
else d+WNg2#v
{ [x{Ai(
/T^
CDialog::OnSysCommand(nID, lParam); g#%Egb1
} -!QVM\t
} ;DgQ8"f
=Cc]ugl7-
void CCaptureDlg::OnPaint() EC/=JlL`5
{ gvFs$X*^:
if (IsIconic()) hw({>cH\
{ uk9!rE"
CPaintDC dc(this); // device context for painting 7 -S?U~s
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ><xJQeW
// Center icon in client rectangle eb>jT:
int cxIcon = GetSystemMetrics(SM_CXICON); lOy1vw'
int cyIcon = GetSystemMetrics(SM_CYICON); <nU8.?\?~
CRect rect; {,B.OM)J
GetClientRect(&rect); Wud-(19
int x = (rect.Width() - cxIcon + 1) / 2; q8!X^1F7
int y = (rect.Height() - cyIcon + 1) / 2; F4]=(T
// Draw the icon `-w, 6
dc.DrawIcon(x, y, m_hIcon); WX*
uhR
} 8o i{%C&-
else VDFs.;:s
{ 1*f*}M
CDialog::OnPaint(); 8?hZ5QvA(j
} _0|@B8!J?
} 4^Og9}bm
Z+Cjg#+
HCURSOR CCaptureDlg::OnQueryDragIcon() _BoYyJQH
{ _<%YLv
return (HCURSOR) m_hIcon; wvmcD%
} $It3}?>C'
BA8g[TA7K
void CCaptureDlg::OnCancel() 3b?8<*
{ ye-[l7
if(bTray) `ES+$ O>
DeleteIcon(); M#k$[w}=
CDialog::OnCancel(); xW|8-q
} 4\E1M[ 6
u'T?e+=
void CCaptureDlg::OnAbout() 1i&|}"
{ to;^'#B
CAboutDlg dlg; }wZsM[NDB
dlg.DoModal(); >8|V[-H
} /r8sL)D+
i&q_h>ZTg
void CCaptureDlg::OnBrowse() }.1}yz^y
{ D?FmlDTr[
CString str; @KRia{
BROWSEINFO bi; '~VF*i^4
char name[MAX_PATH]; i|rC Ga0}
ZeroMemory(&bi,sizeof(BROWSEINFO)); [P|kY
bi.hwndOwner=GetSafeHwnd(); y eam-8
bi.pszDisplayName=name; >abpse
bi.lpszTitle="Select folder"; 'Ck:=V%}g
bi.ulFlags=BIF_RETURNONLYFSDIRS; 55ft,a
LPITEMIDLIST idl=SHBrowseForFolder(&bi); L|nFN}da
if(idl==NULL) biZ=TI2P,L
return; _>bk'V7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X]D:vuB
str.ReleaseBuffer(); .Fx3WryF
m_Path=str; caxOxRo\
if(str.GetAt(str.GetLength()-1)!='\\') 6n|][! f
m_Path+="\\"; G#~U\QlG-
UpdateData(FALSE); ?zf3AZ9
} Jl1\*1"
6E2#VT>@/
void CCaptureDlg::SaveBmp() [{>3"XJ'
{ wD/jN:
CDC dc; s@E)=;!
dc.CreateDC("DISPLAY",NULL,NULL,NULL); lavy?tFer
CBitmap bm; IgRi(q^b-
int Width=GetSystemMetrics(SM_CXSCREEN); BY9Z}/{j
int Height=GetSystemMetrics(SM_CYSCREEN); >*uj
)u%
bm.CreateCompatibleBitmap(&dc,Width,Height); #xfav19{.
CDC tdc; l;$FR4}d
tdc.CreateCompatibleDC(&dc); ?mF:L"i
CBitmap*pOld=tdc.SelectObject(&bm); JmeE}:5lpj
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FAdTp.
tdc.SelectObject(pOld); Xpv<v[a
BITMAP btm; 49HP2E
bm.GetBitmap(&btm); J*_^~t
DWORD size=btm.bmWidthBytes*btm.bmHeight; 7VskZbj\
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %&0/Ypp=
BITMAPINFOHEADER bih; B%`|W@v
bih.biBitCount=btm.bmBitsPixel; [e_<UF@A*
bih.biClrImportant=0; `[e0_g\
bih.biClrUsed=0; *>HS>#S
bih.biCompression=0; $Ld-lQsL
bih.biHeight=btm.bmHeight; 9g#
62oIg
bih.biPlanes=1; S(^YTb7
bih.biSize=sizeof(BITMAPINFOHEADER); ae2I,Qt%
bih.biSizeImage=size; Jvj* z6/a
bih.biWidth=btm.bmWidth; t-iQaobF
bih.biXPelsPerMeter=0; .)1u0 (?
bih.biYPelsPerMeter=0; &$#NV@
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R!\._m?\h
static int filecount=0; Z^J)]UL/
CString name; _g D9oK
name.Format("pict%04d.bmp",filecount++); lQt,(@7]
name=m_Path+name; V1,~GpNx
BITMAPFILEHEADER bfh; B4c;/W-
bfh.bfReserved1=bfh.bfReserved2=0; P8w56
bfh.bfType=((WORD)('M'<< 8)|'B'); 8{7'w|/;.{
bfh.bfSize=54+size; V=PK)FJ
bfh.bfOffBits=54; p^p1{%=
CFile bf; D$D;'Kij
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @00&J~D
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 41rS0QAM
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7E?60^Tve
bf.WriteHuge(lpData,size); <K/iX%b?
bf.Close(); oJ0ZZu?{D
nCount++; aByd,uSe)_
} 2P?|'U
GlobalFreePtr(lpData); " VSma
if(nCount==1) jd}-&DN
m_Number.Format("%d picture captured.",nCount); SbD B[O%
else +^|=MK%
m_Number.Format("%d pictures captured.",nCount); b3+F~G-I"
UpdateData(FALSE); W JG8E7
} HP[M"u
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2su/I
{ 4)NbQ[
if(pMsg -> message == WM_KEYDOWN) JNxrs~}
{ *`~]XM@H
if(pMsg -> wParam == VK_ESCAPE) EdC/]
return TRUE; o&:'MwU
if(pMsg -> wParam == VK_RETURN) U~q2j#pJ
return TRUE; 87yZd8+)
} VhLS*YiSY
return CDialog::PreTranslateMessage(pMsg); W*^_Ul|
} f yhBfA:u
L^xh5{
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1}ws@hU
{ K7=>o*p
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ lAJP X
SaveBmp(); LW!>_~g-
return FALSE; h8hyQd$!
} L-[A1#n
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rBZ0Fx$/[
CMenu pop;
AS/z1M_U
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O 4'/C]B2
CMenu*pMenu=pop.GetSubMenu(0); $nr=4'yZ
pMenu->SetDefaultItem(ID_EXITICON); tX~*.W:
CPoint pt; a7n`(}?Y
GetCursorPos(&pt); vq:?a
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =buarxk
if(id==ID_EXITICON) !24PJ\~I
DeleteIcon(); r -$VPW
else if(id==ID_EXIT) ;*njS1@
OnCancel(); 3@wio[
return FALSE; -S7i':
} c'SjH".[
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {JQCfs
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )>,ndKT~
AddIcon(); y
'Ah*h
return res;
z-_$P)[c
} HsKq/Oyk
.S*VYt%K7
void CCaptureDlg::AddIcon() L [&|<<c
{ Egmp8:nZl@
NOTIFYICONDATA data; _o? I=UN2:
data.cbSize=sizeof(NOTIFYICONDATA); DO6
p v
CString tip; lP*p7Y '
tip.LoadString(IDS_ICONTIP); +<bvh<]Od
data.hIcon=GetIcon(0); S4VM(~,o
data.hWnd=GetSafeHwnd(); lofP$
strcpy(data.szTip,tip); p %hvDC
data.uCallbackMessage=IDM_SHELL; ai"N;1/1O|
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 31cZ6[
data.uID=98; T_[
Shell_NotifyIcon(NIM_ADD,&data); |_ OoD9,M
ShowWindow(SW_HIDE); }kSP p
bTray=TRUE; + cZC$lo
} pgPm0+N
o)+C4f[G4
void CCaptureDlg::DeleteIcon() AjJ/t4<
{ Vg}+w Nt5
NOTIFYICONDATA data; a fLE9
data.cbSize=sizeof(NOTIFYICONDATA); /9o6R:B
data.hWnd=GetSafeHwnd(); V/tl-;W
data.uID=98; iUq_vQ@}}
Shell_NotifyIcon(NIM_DELETE,&data); q);oO\<
ShowWindow(SW_SHOW); \+"Jg/)ij
SetForegroundWindow(); +mN8uU~(kx
ShowWindow(SW_SHOWNORMAL); 5w5"rcV
bTray=FALSE; 2M)E1q|a
} 4kR;K!@k
<?%49
void CCaptureDlg::OnChange() z{/#/,V5D4
{ 5%+epzy
RegisterHotkey(); *;T'=u_lR
} W9]0X
3;88a!AA!
BOOL CCaptureDlg::RegisterHotkey() zXk^ugFy
{ ,{_56j^d,
UpdateData(); %Vfr#j$=
UCHAR mask=0; :;\xyy}A
UCHAR key=0; :lu "14
if(m_bControl) (yoF
mask|=4; lT~WP)
if(m_bAlt) OS1f}<
mask|=2; pcQgWjfS
if(m_bShift) 5Rp mR
mask|=1; k>~D
key=Key_Table[m_Key.GetCurSel()]; >
w SI0N
if(bRegistered){
IFW7MF9V
DeleteHotkey(GetSafeHwnd(),cKey,cMask); PKd'lo
bRegistered=FALSE; R
G~GVf
} ~du U& \
cMask=mask; Pa"Kk9!o36
cKey=key; +pQ3bX
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `aA)n;{/2u
return bRegistered; ]YOWCFAQot
} 4UND;I&
+G+1B6S
四、小结 2*]
[M,L0c
m -0EcA/
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。