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:
c ,RY
j
)Aa
h 一、实现方法
b R;Wf5 AwO'%+Bv 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:
,Taq~ ?{*/VJl$ #pragma data_seg("shareddata")
.LHzaeJCX HHOOK hHook =NULL; //钩子句柄
(J/!9NS: UINT nHookCount =0; //挂接的程序数目
9$:+5f,%a static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
7[u$!.4{* static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Stxrgmu static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
H?<ceK'e static int KeyCount =0;
B(|dT66K static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
j*}2AI #pragma data_seg()
"jG-)k`a GjvTYg~ 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。
$>y '2.11cM3 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
dX:#KdK :*{\oqFn~$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
_Zs]za.#)| cKey,UCHAR cMask)
`SSUQ#@ {
rCdf*; BOOL bAdded=FALSE;
0vm}[a4+i; for(int index=0;index<MAX_KEY;index++){
JqYt^,,Q: if(hCallWnd[index]==0){
vAp?Zl?g hCallWnd[index]=hWnd;
uA2-&smw HotKey[index]=cKey;
^L;k HotKeyMask[index]=cMask;
Q.Ljz
Z bAdded=TRUE;
&SE+7HXw KeyCount++;
5uufpvah break;
!2Q> }
o|0QstSCl }
9F"Q2^l' return bAdded;
`OmYz{*r }
L=WB'*N //删除热键
0al8%z9e@ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GcYT<pwN6 {
``4lomz> BOOL bRemoved=FALSE;
xg2
& for(int index=0;index<MAX_KEY;index++){
Jf=$h20x if(hCallWnd[index]==hWnd){
CuD ^@ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
3?R QPP hCallWnd[index]=NULL;
:},/D*v HotKey[index]=0;
wam-=3W HotKeyMask[index]=0;
86,$ I+ bRemoved=TRUE;
uuMHD{}?} KeyCount--;
,dIo\Lm break;
"G`8>1tO_ }
.}l&lj@# }
`2Oh0{x0*O }
@UidQX"b return bRemoved;
{<3>^ o|" }
[5Dg%?x #UpxF?A( +w
pe<T DLL中的钩子函数如下:
dECH/vJ^ |6.1uRF E2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
:'LG%E:b {
%d\|a~p: BOOL bProcessed=FALSE;
H\Jpw if(HC_ACTION==nCode)
a:3f>0_t {
;c_pa0L if((lParam&0xc0000000)==0xc0000000){// 有键松开
z.7'yJIP# switch(wParam)
)bGd++2 {
h8MkfHH7{ case VK_MENU:
]XH}G9X^ MaskBits&=~ALTBIT;
[o,S.!W8 break;
X519}
l3 case VK_CONTROL:
Qb;5:U/x MaskBits&=~CTRLBIT;
SAEV " break;
32sb$|eQq case VK_SHIFT:
$q6'VLPo MaskBits&=~SHIFTBIT;
s *B-| break;
}@V,v[&e default: //judge the key and send message
dn1Tu6f;| break;
U0M>A }
HjFY>(e for(int index=0;index<MAX_KEY;index++){
.{|AHW&0< if(hCallWnd[index]==NULL)
!cWnQRIt_F continue;
wCb%{iowH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<C'S#5,2 {
-)Y?1w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
%Jpb&CEY bProcessed=TRUE;
/B?hM&@z }
6/#5TdJA }
$Di2BA4Di }
+RO=a_AS else if((lParam&0xc000ffff)==1){ //有键按下
[,|Z< switch(wParam)
XTZI! {
j8G>0f) case VK_MENU:
{:3XP<hqN MaskBits|=ALTBIT;
`f2m5qTP% break;
,j ('QvavJ case VK_CONTROL:
~"*;lT5KX MaskBits|=CTRLBIT;
-e{H 8ro break;
pw7_j;}l case VK_SHIFT:
d.7Xvx0Yww MaskBits|=SHIFTBIT;
2ju1<t,8) break;
}fo?K|Xx default: //judge the key and send message
RhJL`>W` break;
"F+Wo& }
"Jp6EL% for(int index=0;index<MAX_KEY;index++){
2Z-BZu K6p if(hCallWnd[index]==NULL)
z^f-MgWG continue;
DT=! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`f:5w^A {
a`w)awb SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
a91Q*X% bProcessed=TRUE;
mP)<;gm, }
vR?L/G^. }
Z6b3gV }
XKsG2>l-W if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Zv=p0xH for(int index=0;index<MAX_KEY;index++){
y^ C;?B< if(hCallWnd[index]==NULL)
*4zVK/FJ continue;
Hc@Z7eQ3^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Lh &L5p7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
c3lfmTT6^ //lParam的意义可看MSDN中WM_KEYDOWN部分
*ihg' }
Kg@9kJB }
n#N<zC/ }
|jV4]7Luq return CallNextHookEx( hHook, nCode, wParam, lParam );
d]e`t"Aj }
r)mm8MI!Z )N-+,Ms 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:
(D8'qx-M &-+&`h|s BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
|k'I?:' BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{kJ[) 7 XEZ6%Q_ 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:
$Mx.8FC + eT+MN` LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
>t8eVMMa {
@D"1}CW if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
S$"A[ {
UhCd, //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
E"Xi SaveBmp();
,ASY
&J5)7 return FALSE;
$^7&bQ }
cQPH le2 …… //其它处理及默认处理
]dDyz[NuvD }
N13 <!QQ $zCUQthL@ {uj9fE,) 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
q@(N 38D W,agPG\+ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
j7-#">YL }qz58]fyx 二、编程步骤
;T52aX )KRO=~Y 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
q#\eL~k n.lp
ena 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
d(a6vEL4 bM^'q 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
72-@!Z0e g6W.Gl"5\w 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
y+:< "E2
g7n& 5、 添加代码,编译运行程序。
.
~|^du<X NHc+QMbou( 三、程序代码
6-X7C9`C 1 *-58N* ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
n6o}$]H #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
>8NQ8i=]V1 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
5. l&nt' #if _MSC_VER > 1000
q>omCk%h #pragma once
FpRK^MEkG #endif // _MSC_VER > 1000
#3CA #ifndef __AFXWIN_H__
h V8A<VT #error include 'stdafx.h' before including this file for PCH
Pq4sv`q)S #endif
SyYa_=En #include "resource.h" // main symbols
jEO; class CHookApp : public CWinApp
\W@?revK {
sox90o 7 public:
F37,u| CHookApp();
9) YG)A~< // Overrides
hG;u8|uT^i // ClassWizard generated virtual function overrides
V
u!,tpa. //{{AFX_VIRTUAL(CHookApp)
n6uobo- public:
f:utw T virtual BOOL InitInstance();
E_y h9lk virtual int ExitInstance();
&FanD //}}AFX_VIRTUAL
?y04g u6p //{{AFX_MSG(CHookApp)
:!A@B.E // NOTE - the ClassWizard will add and remove member functions here.
Q'=!1^& // DO NOT EDIT what you see in these blocks of generated code !
aVtwpkgZ //}}AFX_MSG
4*dT|NU DECLARE_MESSAGE_MAP()
"1#,d#Q $ };
1%=,J'AH LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
i'EXylb BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5g&'n BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\dc`}}Lc BOOL InitHotkey();
Y|lMa?\E BOOL UnInit();
be@MQ}6> #endif
uuC/F_='B iCEX|Tj; //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
n+i}>3'A #include "stdafx.h"
H5aUZ= #include "hook.h"
_88~uYG #include <windowsx.h>
`H|g~7KD& #ifdef _DEBUG
I%s/h4x^B[ #define new DEBUG_NEW
QTyl=z7 #undef THIS_FILE
$ `ho+ static char THIS_FILE[] = __FILE__;
. }1!MK5 #endif
BW*zj=N% #define MAX_KEY 100
}gn0bCJy #define CTRLBIT 0x04
O0I/^ #define ALTBIT 0x02
,#m\W8j #define SHIFTBIT 0x01
x-W0 h #pragma data_seg("shareddata")
}z*p2)v` HHOOK hHook =NULL;
R`<E3J\* UINT nHookCount =0;
[lJ[kr*7 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
z DK+8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
TUUBC% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
3whyIXs static int KeyCount =0;
#QB`'2)vw static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Ar$LA"vu4 #pragma data_seg()
}$UFc1He\J HINSTANCE hins;
I'j?T. void VerifyWindow();
w7W-=\Hvh BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
#nd,c n //{{AFX_MSG_MAP(CHookApp)
_8`|KY // NOTE - the ClassWizard will add and remove mapping macros here.
8_LDS // DO NOT EDIT what you see in these blocks of generated code!
r#j*vO ' //}}AFX_MSG_MAP
:= 8vy END_MESSAGE_MAP()
RU'J!-w{ 1hN!
2Y: CHookApp::CHookApp()
_1Eyqh`oh {
lV1|\~?4 // TODO: add construction code here,
MWuVV=rd8a // Place all significant initialization in InitInstance
"N;|~S)w! }
$pKS['J0 BZBsE
:(F CHookApp theApp;
JSL 3.J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&0"`\~lA {
(+@.L7>m+t BOOL bProcessed=FALSE;
)Qc$UI8L if(HC_ACTION==nCode)
#-`lLI:w0 {
WZr~Pb9 if((lParam&0xc0000000)==0xc0000000){// Key up
"&ks83 switch(wParam)
g=%&p?1@E {
v7R&9kU{ case VK_MENU:
Il642#Gh MaskBits&=~ALTBIT;
(1o^Dn3 break;
6 qq7: case VK_CONTROL:
Em7q@ MaskBits&=~CTRLBIT;
wVVe L$28 break;
jL8zH case VK_SHIFT:
oMVwIdf MaskBits&=~SHIFTBIT;
WAEKvM4*i0 break;
qRFN@ID$ default: //judge the key and send message
ev3x*}d0 break;
O<hHo]jLF }
3,[2-obmi for(int index=0;index<MAX_KEY;index++){
qq`RfZjL if(hCallWnd[index]==NULL)
\z{Y(dS continue;
M Q6Y^,B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,y >Na{@Y {
@K/Ia!Lw SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4|(?Wt)5 bProcessed=TRUE;
j.6kjQN }
9NT;^K^I }
i_MI!o }
0b4OJ[ else if((lParam&0xc000ffff)==1){ //Key down
t'J
fiGM switch(wParam)
}:%pOL n {
q2Kn3{ case VK_MENU:
jz)H?UuDY MaskBits|=ALTBIT;
A=$oYBB break;
W)#`4a^xj7 case VK_CONTROL:
>4\xcL MaskBits|=CTRLBIT;
qj1z>,\ break;
X=3@M_Jzo case VK_SHIFT:
#^9;<@M MaskBits|=SHIFTBIT;
cC4T3]4l' break;
)>fi={!=c default: //judge the key and send message
e-VLU; break;
!r|X6`g }
j#& for(int index=0;index<MAX_KEY;index++)
>=V+X"\Z {
ueR42J%s if(hCallWnd[index]==NULL)
.bE,Q9: continue;
,B2-'O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zgqw*)C~ {
;i9CQ0e? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
a3;.{6el)H bProcessed=TRUE;
$c}0L0 }
}$-VI\96 }
a%dx\&K }
pd#/;LT if(!bProcessed){
b5DrwX{Ff for(int index=0;index<MAX_KEY;index++){
AJT0)FCpR if(hCallWnd[index]==NULL)
v\ Ljm,+ continue;
6"7qZq if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z'lNO| nU SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Iqsk\2W]a3 }
qC )VT3 }
L?0l1P }
F(<8:`N;G return CallNextHookEx( hHook, nCode, wParam, lParam );
\ax%I)3 }
}kj6hnQ {Fi@|' BOOL InitHotkey()
:j~5(K" {
@m V C if(hHook!=NULL){
{rT`*P~ nHookCount++;
o!~bR
return TRUE;
to3J@:V8e }
>| ?T| else
[R4x[36Zp hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
;X(n3F if(hHook!=NULL)
?_aR-[XRg nHookCount++;
spJ(1F{|V return (hHook!=NULL);
I*}#nY0+ }
C t)MvZ BOOL UnInit()
D.(G 9H {
Rs`a@Fn if(nHookCount>1){
~8*oGG~s nHookCount--;
YJ$ewK4E#. return TRUE;
>A&@W p1 }
F-^HN% BOOL unhooked = UnhookWindowsHookEx(hHook);
1c#'5~nB if(unhooked==TRUE){
G+uiZ(p> nHookCount=0;
s{e(- 7' hHook=NULL;
Ug21d42Z4 }
^d80\PXz return unhooked;
:eW~nI.Vc }
P0xLx !dY:S';~ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
SbZt\a 8 {
hZ<btN.y5 BOOL bAdded=FALSE;
cA?
x( for(int index=0;index<MAX_KEY;index++){
|L;psK if(hCallWnd[index]==0){
d|]O<]CG_ hCallWnd[index]=hWnd;
K;[%S HotKey[index]=cKey;
AxlFU~E4 HotKeyMask[index]=cMask;
GYC&P] bAdded=TRUE;
#OWs3$9
KeyCount++;
(0W}e(D8
break;
jJZsBOW[8 }
8%<`$`FyU }
8/"|VE DOr return bAdded;
V=&,^qZ }
gvNZrp>e! -j_I_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:(>9u.>l?5 {
|xZcT4 BOOL bRemoved=FALSE;
mE`qvavP|/ for(int index=0;index<MAX_KEY;index++){
>&QH{!( if(hCallWnd[index]==hWnd){
{X<4wxeTo if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
xn@0pL3B~ hCallWnd[index]=NULL;
*ldMr{s<R HotKey[index]=0;
U5!f++ HotKeyMask[index]=0;
q9Sz7_K bRemoved=TRUE;
-Zg @D(pF KeyCount--;
1?|6odc break;
b$O_L4CP }
9K':Fn2, }
`t0f L\T }
j yRSEk$ return bRemoved;
=nx:GT3&[ }
|<-F|v9og `QdQ?9x{F void VerifyWindow()
<m,yFk {
K;p<f{PE for(int i=0;i<MAX_KEY;i++){
BD7@Mj*| if(hCallWnd
!=NULL){ pXh~#o6V
if(!IsWindow(hCallWnd)){ K\+}q{
hCallWnd=NULL; .^lbLN^2
HotKey=0; HI\f>U
HotKeyMask=0; *fi;ZUPW3
KeyCount--; P%sO(_PuT
} $[iT~B$
}
}{xN`pZ
} <;cE/W}}
} 8A^jD(|
@f{_=~+
BOOL CHookApp::InitInstance() 8ts+'65|F
{ vA"niO
AFX_MANAGE_STATE(AfxGetStaticModuleState()); c5E#QV0&v~
hins=AfxGetInstanceHandle(); [OZ=iz.
InitHotkey(); rN1U.FRe/
return CWinApp::InitInstance(); -
SS r
} HCG@#W<wc
B>Cs&}Y!
int CHookApp::ExitInstance()
xs'kO=
{ O R<"LTCL
VerifyWindow(); 4su_;+]
UnInit(); f{Fe+iPc
return CWinApp::ExitInstance(); 'B (eMnLg
} LuP?$~z
t{SMSp
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Y^6[[vaj2
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) hyb +#R
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q"|kW[Sg
#if _MSC_VER > 1000 $iqi:vY
#pragma once %gu$_S
#endif // _MSC_VER > 1000 )p<fL
AB"1(PbG
class CCaptureDlg : public CDialog 3`k[!!
{ ?,:#8.9
// Construction !ml_S)
public: ?orh JS
BOOL bTray; 5U{4TeUH
BOOL bRegistered; -/UXd4S
BOOL RegisterHotkey(); b>QM~mq3^I
UCHAR cKey; tyuk{*Me:
UCHAR cMask; 3gG+`{<
void DeleteIcon(); -
LiPHHX<
void AddIcon(); LMFK3Gd[
UINT nCount; >H}jR[H'
void SaveBmp(); Ty3CBR{6
CCaptureDlg(CWnd* pParent = NULL); // standard constructor .3a:n\tY
// Dialog Data .6#cDrK
//{{AFX_DATA(CCaptureDlg) /z1p/RiX
enum { IDD = IDD_CAPTURE_DIALOG }; `M?v!]o
CComboBox m_Key; C[xJU6z
BOOL m_bControl; 1t~FW-:
BOOL m_bAlt; Y .
BOOL m_bShift; dXiE.Si
CString m_Path; hG3m7ht
CString m_Number; A{z>D`d
//}}AFX_DATA 3+(yI 4
// ClassWizard generated virtual function overrides ]eYd8s+
//{{AFX_VIRTUAL(CCaptureDlg) xN`r4
public: aGB0-;.t7
virtual BOOL PreTranslateMessage(MSG* pMsg); JFRpsv
protected: m']9Q3-
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?aFr8i:)M
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); BFMS*t`
//}}AFX_VIRTUAL 5[,+\
// Implementation 0{?:FQ#
protected: (@)2PO/
HICON m_hIcon; q]"2hLq
// Generated message map functions F1gt3 ae
//{{AFX_MSG(CCaptureDlg) ZT) !8
virtual BOOL OnInitDialog(); Cf0|Z
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *$i; o3
afx_msg void OnPaint(); HKTeqH_:
afx_msg HCURSOR OnQueryDragIcon(); 7q%|4Z-~
virtual void OnCancel(); ^^7L"je]g
afx_msg void OnAbout(); euV $2Fg
afx_msg void OnBrowse(); @s%X
afx_msg void OnChange(); <.,RBo
//}}AFX_MSG L#`2.nU
DECLARE_MESSAGE_MAP() EI1W
.V>@
}; [)#u<lZ<~
#endif /Jxq
3D)v
{ExII<=6
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9ZDVy7m\i-
#include "stdafx.h" FZe:co8Mu
#include "Capture.h" *.,"N}
#include "CaptureDlg.h" ePp[m
zg6
#include <windowsx.h> SU%mmwES3
#pragma comment(lib,"hook.lib") >u=%Lz"J
#ifdef _DEBUG +I|Rk&
#define new DEBUG_NEW U^%9
)4bj
#undef THIS_FILE rO/a,vV
static char THIS_FILE[] = __FILE__; "^;#f+0
#endif HLjvKE=W
#define IDM_SHELL WM_USER+1 $!!R:Wn/R
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iv:,fkwG
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {(rf/:X!p
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; X*pZNz&E
class CAboutDlg : public CDialog T/[f5?p
{ lij B#1<8*
public: j~Q}F |i8
CAboutDlg(); A LXUaE.
// Dialog Data Q |
//{{AFX_DATA(CAboutDlg) ,{k<JA{
enum { IDD = IDD_ABOUTBOX }; ~?#~ Ar
//}}AFX_DATA m</]D WJ
// ClassWizard generated virtual function overrides }>2t&+v+
//{{AFX_VIRTUAL(CAboutDlg) gaQ[3g
protected: w{PUj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N0+hejz
//}}AFX_VIRTUAL b-PSm=`
// Implementation j!YNg*H
protected: hZcmP"wgC1
//{{AFX_MSG(CAboutDlg) \B_i$<Sz
//}}AFX_MSG zhNQuK,L
DECLARE_MESSAGE_MAP() ?-e7e%
}; SOVjEo4'3
>Q;
g0\I_
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wHx}U M"
{ :^n*V6.4
//{{AFX_DATA_INIT(CAboutDlg) YWEYHr;%^?
//}}AFX_DATA_INIT lM>.@:
}
:-z&Y492
K[kds`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) H4t)+(:D'
{ Zr=ib
CDialog::DoDataExchange(pDX); 7 0_}S*T
//{{AFX_DATA_MAP(CAboutDlg) ^f9>l;Lb
//}}AFX_DATA_MAP p"2m90IO
} Cl,9yU)1n
elu=9d];@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *-0>3
//{{AFX_MSG_MAP(CAboutDlg) jh[
#p?:
// No message handlers H"eS<eT
//}}AFX_MSG_MAP 13H;p[$
END_MESSAGE_MAP() ;AKwx|I$g
Hb+X}7c$
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) E Zi &]
: CDialog(CCaptureDlg::IDD, pParent) z)
:ka"e
{ j1/+\8Y
//{{AFX_DATA_INIT(CCaptureDlg) Oukd_Ryf
m_bControl = FALSE; :$NsR*Cq*9
m_bAlt = FALSE; 1Pm4.C)
m_bShift = FALSE; V\0E=M*P
m_Path = _T("c:\\"); I!P4(3skAB
m_Number = _T("0 picture captured."); 8) HBh7/
nCount=0; c&E]E(
bRegistered=FALSE; 2`EVdl7B]
bTray=FALSE; 1B 5:s,Oyj
//}}AFX_DATA_INIT A_Rrcsl4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 tAERbiH
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); '3^Q14`R
} k@yh+ v5
,]ga[
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =NadAyv
{ D93gH1z
CDialog::DoDataExchange(pDX); =J](.78
//{{AFX_DATA_MAP(CCaptureDlg) *r;xw
DDX_Control(pDX, IDC_KEY, m_Key); Vz{>cSz#
DDX_Check(pDX, IDC_CONTROL, m_bControl); GF*>~_Yr
DDX_Check(pDX, IDC_ALT, m_bAlt); @o6R[5(
DDX_Check(pDX, IDC_SHIFT, m_bShift); {?Od{d9
DDX_Text(pDX, IDC_PATH, m_Path); pr_>b`p6
DDX_Text(pDX, IDC_NUMBER, m_Number); 9YD\~v;x
//}}AFX_DATA_MAP eeM?]J-
} #AShbl jm+
\Wr,<Y
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }9^@5!qX
//{{AFX_MSG_MAP(CCaptureDlg) {{\ce;hN
ON_WM_SYSCOMMAND() M%I@<~wl
ON_WM_PAINT() Xwt`(h[u
ON_WM_QUERYDRAGICON() M*w' 1fT
ON_BN_CLICKED(ID_ABOUT, OnAbout) >{wuEPA
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U6<M/>RG$
ON_BN_CLICKED(ID_CHANGE, OnChange) Huc|6~X
//}}AFX_MSG_MAP )hBE11,PB
END_MESSAGE_MAP() A
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c+g@Z"es
BOOL CCaptureDlg::OnInitDialog() `PgdJrE
{ ZIDbqQu
CDialog::OnInitDialog(); _|A+) K
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {]^O:i"
ASSERT(IDM_ABOUTBOX < 0xF000); /,2rjJ#b
CMenu* pSysMenu = GetSystemMenu(FALSE); ;'0=T0\
if (pSysMenu != NULL) s9 @Sd
{ .fp&MgiQ
CString strAboutMenu; 5pfYEofK[
strAboutMenu.LoadString(IDS_ABOUTBOX); D<>@
%"%
if (!strAboutMenu.IsEmpty()) XRxj W
{ `:p1&OS
pSysMenu->AppendMenu(MF_SEPARATOR); KnGTcoXg_
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tlQC6Fb#
} >&Y-u%}U
} U<^F4*G
SetIcon(m_hIcon, TRUE); // Set big icon U\zD,<I9
SetIcon(m_hIcon, FALSE); // Set small icon o:~LF6A-
m_Key.SetCurSel(0); bWmw3w
RegisterHotkey(); eM2|c3/
CMenu* pMenu=GetSystemMenu(FALSE); 'RbQj}@x
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); * ?]~
#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =^tA_AxVw
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); iX "C/L|JN
return TRUE; // return TRUE unless you set the focus to a control
s2REt$.q
} 6KRO{QK
Yf}xwpuLk
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *z8|P#@
{ 0^3+P%(o@
if ((nID & 0xFFF0) == IDM_ABOUTBOX) D=+NxR[
{ ,eRQu.
CAboutDlg dlgAbout; nL-K)G,
dlgAbout.DoModal(); T^:fn-S}=
} 4CrLkr
else p*20-!{A
{ sOpep
CDialog::OnSysCommand(nID, lParam); <%P2qgz5
} D+RiM~LH8
} xr%#dVk
h&;t.Gdf
void CCaptureDlg::OnPaint() nB5zNyY4
{ S6g<M5^R
if (IsIconic()) }ptq
)p
{ a`!@+6yC
CPaintDC dc(this); // device context for painting ^5; `-Ky
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Y`BRh9Sa
// Center icon in client rectangle }t%W1UJ
int cxIcon = GetSystemMetrics(SM_CXICON); lz<]5T|
int cyIcon = GetSystemMetrics(SM_CYICON); oM1Qh?
CRect rect; m@Rtlb
GetClientRect(&rect); y7)(LQRE
{
int x = (rect.Width() - cxIcon + 1) / 2; ]uQqn]+I!
int y = (rect.Height() - cyIcon + 1) / 2; T.mmmT
// Draw the icon k[kju%i4
dc.DrawIcon(x, y, m_hIcon); ._PzYE|m2
} u0Nm.--;_3
else Wl-<HR!n
{ !EIjN
CDialog::OnPaint(); eOI (6U!
} CAD@XZSh
} SF[FmN!^^
t#i,1aHA
HCURSOR CCaptureDlg::OnQueryDragIcon() OI}cs2m
{ &(N+.T5cp
return (HCURSOR) m_hIcon; .@ F]Pht
} =
ieag7!
~j9O$s~)
void CCaptureDlg::OnCancel() =]C]=
{ &--ej|n
if(bTray) )#iq4@)|g
DeleteIcon(); bm% $86
CDialog::OnCancel(); }"^'%C8EX
} 9DQa
PA6
[7FItlF%I
void CCaptureDlg::OnAbout() %w7pkh,
{ |r%D\EB
CAboutDlg dlg; YXo|~p;=Y
dlg.DoModal(); Z\}K{#
} T~_/Vi
uxaYCa?
void CCaptureDlg::OnBrowse() ({WyDu&=
{ Q'O[R+YT ,
CString str; y|wlq3o
BROWSEINFO bi; ^BQrbY
char name[MAX_PATH]; Q[F}r`
ZeroMemory(&bi,sizeof(BROWSEINFO)); ^vilgg~
bi.hwndOwner=GetSafeHwnd(); rl2&^N
bi.pszDisplayName=name; :GpDg
bi.lpszTitle="Select folder"; UMl#D>:C<
bi.ulFlags=BIF_RETURNONLYFSDIRS; ={>Lrig:l
LPITEMIDLIST idl=SHBrowseForFolder(&bi); $37
g]ZD
if(idl==NULL) 6GPp>X
return; G uQ=gN
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); GVHV =E
str.ReleaseBuffer(); *jIqAhs0{
m_Path=str; mE%$HZ}
if(str.GetAt(str.GetLength()-1)!='\\') _j?e~w&0b
m_Path+="\\"; 29CINC
UpdateData(FALSE); a]
=
} jO*l3:!~ \
%wcSM~w
void CCaptureDlg::SaveBmp() :+Om]#`Vls
{ } :=Tm]S
CDC dc; `K~AhlJUQ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2_vbT!_
CBitmap bm; r%:+$aIt
int Width=GetSystemMetrics(SM_CXSCREEN); h\v'9
int Height=GetSystemMetrics(SM_CYSCREEN); ,to+oSZE
bm.CreateCompatibleBitmap(&dc,Width,Height); ,1OyN]f3
CDC tdc; c:Wze*vI;
tdc.CreateCompatibleDC(&dc); om?-WJI
CBitmap*pOld=tdc.SelectObject(&bm); g<{xC_J
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )q7UxzE+
tdc.SelectObject(pOld); m<FOu<y
BITMAP btm; 8#!i[UFdj
bm.GetBitmap(&btm); 5%sE]Y#
DWORD size=btm.bmWidthBytes*btm.bmHeight; xk&Jl#v
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {:@tQdM:i8
BITMAPINFOHEADER bih; w2_bd7Wp<
bih.biBitCount=btm.bmBitsPixel; b)(?qfXWP
bih.biClrImportant=0; >h0-;
bih.biClrUsed=0; M9zfT!-
bih.biCompression=0; {pM?5"MMJ
bih.biHeight=btm.bmHeight; hW!)w
bih.biPlanes=1; q[`j`8YY!R
bih.biSize=sizeof(BITMAPINFOHEADER); b&1`NO
bih.biSizeImage=size; y6]vl=^L
bih.biWidth=btm.bmWidth; z~`b\A,$
bih.biXPelsPerMeter=0; zg-2C>(6a
bih.biYPelsPerMeter=0; jck}" N
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ys 5&PZg*
static int filecount=0; !uQPc
CString name; a5a($D
name.Format("pict%04d.bmp",filecount++); pPd#N'\*
name=m_Path+name; 9]q:[zm^
BITMAPFILEHEADER bfh; &gzCteS
bfh.bfReserved1=bfh.bfReserved2=0; T)r9-wOq
bfh.bfType=((WORD)('M'<< 8)|'B'); Yn8=
bfh.bfSize=54+size; C z\Pp q
bfh.bfOffBits=54; ~ vqa7~}m
CFile bf; R<OI1,..r
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sc,Xw:YO
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); o=0]el^A
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W`c'=c
bf.WriteHuge(lpData,size); M Y|w
bf.Close(); yX~v-N!X
nCount++; y+7w,m2
} ~NW32
O)/
GlobalFreePtr(lpData); \7CGUB>L
if(nCount==1) ai0XL}!+
m_Number.Format("%d picture captured.",nCount); h@a+NE8
else c y8;@[#9
m_Number.Format("%d pictures captured.",nCount); lRXK\xIP ,
UpdateData(FALSE); 8By|@LO
} eq UME
Ol!ntNhXm
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _%QhOY5tv"
{ 6F e34n]m
if(pMsg -> message == WM_KEYDOWN) }iuWAFZbGS
{ j_Yp>=+[
if(pMsg -> wParam == VK_ESCAPE) BCA&mi3q
return TRUE; fkac_X$7
if(pMsg -> wParam == VK_RETURN) o}ZdTf=
return TRUE; `]%|f
} i>(e}<i
return CDialog::PreTranslateMessage(pMsg); kh`"WN Nt
} eH{[C*
8YbE`32
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yj\Nkh
{ c"[cNZo
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :Y [LN
SaveBmp(); z*-2.}&U<
return FALSE; A{A\RSZ0
} ?!+MM&c-n
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [UH||qW
CMenu pop; 0\e IQp
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); wp&=$Aa)'
CMenu*pMenu=pop.GetSubMenu(0); I1X-s
pMenu->SetDefaultItem(ID_EXITICON); EKO[ !,
CPoint pt; 13>0OKg`#
GetCursorPos(&pt); UeRj< \"Q
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D|{jR~J)xK
if(id==ID_EXITICON) HPZ}*m'
DeleteIcon(); J@u;H$@/y
else if(id==ID_EXIT) 62zYRs\Y)X
OnCancel(); [EKQR>s)
return FALSE; "yS _s
} K57&yVX
LRESULT res= CDialog::WindowProc(message, wParam, lParam); qw^uPs7Uw
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) adR)Uq9
AddIcon(); 3xaR@xjS
return res; cH&J{WeZa
} ,LnII
w9bbMx
void CCaptureDlg::AddIcon() ;<ZLcTL
{ S Em Q@1
NOTIFYICONDATA data; Y/*mUS[oa
data.cbSize=sizeof(NOTIFYICONDATA); h%uZYsK
CString tip; 2%_vXo=I
tip.LoadString(IDS_ICONTIP); WHj'dodS
data.hIcon=GetIcon(0); 2I,^YWR
data.hWnd=GetSafeHwnd(); 9J2NH|]c
strcpy(data.szTip,tip); W>j !Q^?
data.uCallbackMessage=IDM_SHELL; M
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data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; c_4[e5z
data.uID=98; 0E3[N:s
Shell_NotifyIcon(NIM_ADD,&data); 0"pAN[=K@
ShowWindow(SW_HIDE); !]=d-RGNe
bTray=TRUE; sG92XJ
} md"!33 @
c"B{/;A
void CCaptureDlg::DeleteIcon() G6$kv2(k`@
{ UdpF@Q
NOTIFYICONDATA data; <4HDZ{"M
data.cbSize=sizeof(NOTIFYICONDATA); gMzcTmbc8
data.hWnd=GetSafeHwnd(); zdYy^8V|z
data.uID=98; 3`t%g[D1
Shell_NotifyIcon(NIM_DELETE,&data); PoxK{Y
ShowWindow(SW_SHOW); ^rifRY-,yO
SetForegroundWindow(); Hl{S]]z
ShowWindow(SW_SHOWNORMAL); `)T13Xv
bTray=FALSE; KbA?7^zo`
} n$$SNWgM
tp6 3@L|Q
void CCaptureDlg::OnChange() d?A
0MKnl
{ YoBDvV":@
RegisterHotkey(); \1^^\G>H5
} K<>oa[B9
XovRg,
BOOL CCaptureDlg::RegisterHotkey() P\1L7%*lU
{ nU7>uU
UpdateData(); v>Q#B
UCHAR mask=0; i3@)W4{
UCHAR key=0; ~a ]+#D
if(m_bControl) x|pg"v&[
mask|=4; _( {hc+9p
if(m_bAlt) {xXsBh
Y
mask|=2; >n'o*gZM
if(m_bShift) 1H6<[iHW
mask|=1; "@iK'
c^
key=Key_Table[m_Key.GetCurSel()]; l`#4KCL(
if(bRegistered){ pKpUXfQu
DeleteHotkey(GetSafeHwnd(),cKey,cMask); X-K=!pET
bRegistered=FALSE; {zQ8)$CQ
} ChGYTn`X
cMask=mask; au:
fw
cKey=key; _Xk.p_uh
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -?V-*jI
return bRegistered; 5Co
} H[,i{dD
f4 P8Oz
四、小结 I|gB@|_~
'
aq!^!z
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。