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:
j2 %^qL
K9Hqq7"% 一、实现方法
L=;
-x9 ??&<k 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:
%;xOB^H^ ~@W*r5/ #pragma data_seg("shareddata")
Kg\R+i@#< HHOOK hHook =NULL; //钩子句柄
{w6/[-^ UINT nHookCount =0; //挂接的程序数目
`Ityi} static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
.ic:`1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
]/X(V|t static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
p
*w$:L static int KeyCount =0;
eD?3"!c! static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
@OpNHQat9 #pragma data_seg()
/0MDISQy9 *#
{z 3{+ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
R:aa+MX(1 V^s0fWa DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
gb|Q%LS9R =n(3o$r( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
TI|/u$SJ<Z cKey,UCHAR cMask)
PJ4(}a {
@~td`Z?1y BOOL bAdded=FALSE;
*Mc7f ?H for(int index=0;index<MAX_KEY;index++){
0MF}^"R if(hCallWnd[index]==0){
c]k*}W3T hCallWnd[index]=hWnd;
_QOZsEe HotKey[index]=cKey;
$.%rAa_H HotKeyMask[index]=cMask;
Fg]?zEa bAdded=TRUE;
sBX-X$*N KeyCount++;
^Q<mV*~ break;
W i.5Y{ }
t<iEj"5 }
X;F8_+Np return bAdded;
I^\&y(LJF }
~Ou1WnmO //删除热键
,MPB/j^o5! BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Gbpw5n;e {
rZXrT}Xh{W BOOL bRemoved=FALSE;
2S[-$9 for(int index=0;index<MAX_KEY;index++){
5Qwh(C^H if(hCallWnd[index]==hWnd){
y]
oaO+ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Io`P,l: hCallWnd[index]=NULL;
qy1F*kY HotKey[index]=0;
&<TzGB* HotKeyMask[index]=0;
OWp%v_y] bRemoved=TRUE;
B5%n(,Lx KeyCount--;
72uz<i!&$ break;
{V19Zv"j }
#SVNHpx }
[(kB
5 a }
yM.IxpT#$ return bRemoved;
ZFm`UXS }
w8Q<r. )::>q5c EI>l-N2 DLL中的钩子函数如下:
?tdd3ai> BimjQ;jtI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a3SlxsWW {
F'}'(t+oAm BOOL bProcessed=FALSE;
e!-,PU9+ if(HC_ACTION==nCode)
.R*!aK {
"^j>tii if((lParam&0xc0000000)==0xc0000000){// 有键松开
O) |P,? switch(wParam)
_9H*agRe {
BAj-akc f case VK_MENU:
#hfuH=&oh MaskBits&=~ALTBIT;
POI.]1i break;
:,12")N case VK_CONTROL:
]
Wy) MaskBits&=~CTRLBIT;
S{]7C?4` break;
0-Y:v(|. case VK_SHIFT:
+yob)% MaskBits&=~SHIFTBIT;
%sBAl.!BN break;
&.13dq default: //judge the key and send message
MB
ju![n break;
j1 q[2' }
s.Y4pWd5@ for(int index=0;index<MAX_KEY;index++){
=;a!u if(hCallWnd[index]==NULL)
Di_2Plo)4 continue;
5wao1sd# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)4U>!KrY {
w.\w1:d SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[S]S^ej*8 bProcessed=TRUE;
tY${M^^<J }
vr^~yEr }
q LL,F }
[H\:pP8t else if((lParam&0xc000ffff)==1){ //有键按下
AmPMY:1i" switch(wParam)
0kQPJWF {
V3;.{0k case VK_MENU:
=h6
sPJ MaskBits|=ALTBIT;
b !@Sn/ break;
qW:)!z3\ case VK_CONTROL:
G|w=ez MaskBits|=CTRLBIT;
,
^F)L| break;
GDhE[of case VK_SHIFT:
4D%9Rc0 G MaskBits|=SHIFTBIT;
'3]p29v{ break;
#PDf,^ default: //judge the key and send message
HjqB^|z break;
,B(7\ }
/iNa'W5\ for(int index=0;index<MAX_KEY;index++){
>SN|?|2U/ if(hCallWnd[index]==NULL)
9Etz:?)b continue;
iI@jZVk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
02`$OTKz {
.#u_#=g? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)Au6Nf
bProcessed=TRUE;
M2x[" }
#*$P'r }
(iJ1
;x }
5J)=} e if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
(BxJryXm for(int index=0;index<MAX_KEY;index++){
+MbIB&fRCB if(hCallWnd[index]==NULL)
[XRCLi} continue;
l+V,DCE if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
QVF]Ci_= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
"Td`AuP@, //lParam的意义可看MSDN中WM_KEYDOWN部分
4nH*Ui!T }
`-`qdda }
!UOCJj.cA }
[%50/_h return CallNextHookEx( hHook, nCode, wParam, lParam );
kg][qn|>J] }
jV#ahNq; n?\ nn3 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
`nKH"TaX )b<k#(i@# BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
=1I#f BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
50TA:7 ~U(,TjJb 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Qu=LnGo~P nVu&/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
f)c~cJz<q {
Q$obOEr2( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
)%SkJ {
W3vi@kb] //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
!3iGz_y SaveBmp();
rhpPCt return FALSE;
zWpqJK }
GU't%[ …… //其它处理及默认处理
jztq.2-c# }
9jN)I(^D6 R(P%Csbqh $Y=T&O 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
:+{ ? -U<Upn)2 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
e{;OSk`x |9"p|6G?B 二、编程步骤
7&`}~$>}>e +,:du*C 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";
qQpnLV 4 (>mI'!4d 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
t
E` cau
:Ih|en^w 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;
y@j,a ) xbO6V 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;
Tu{h<Zy )!g{Sbl 5、 添加代码,编译运行程序。
EFpIp4_Y #-3=o6DCK 三、程序代码
"'g[1Li =.y*_Ja ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
HL/bS/KX #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
uE[(cko #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Om M=o*d #if _MSC_VER > 1000
+\li*G]:J #pragma once
#`GY}-hL! #endif // _MSC_VER > 1000
!R*-R.% #ifndef __AFXWIN_H__
Q^p|Ldj #error include 'stdafx.h' before including this file for PCH
h/x0]@M& #endif
$^&ig #include "resource.h" // main symbols
[Q\GxX. class CHookApp : public CWinApp
Hk>79}; {
2=?tJ2E public:
^:9$@+a CHookApp();
0Io'bF // Overrides
$?,a[79 // ClassWizard generated virtual function overrides
Tirux ; //{{AFX_VIRTUAL(CHookApp)
Xh J,"=E+ public:
g8!wb{8?s virtual BOOL InitInstance();
}SI GPVM virtual int ExitInstance();
oG$)UTzGc //}}AFX_VIRTUAL
LlBN-9p //{{AFX_MSG(CHookApp)
0-LpqX // NOTE - the ClassWizard will add and remove member functions here.
e*+FpW@ // DO NOT EDIT what you see in these blocks of generated code !
=%zLh<3v //}}AFX_MSG
Z~A@o""F DECLARE_MESSAGE_MAP()
{bO|409>W };
`@i5i(( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Z%GTnG|rG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-XRn~=5 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
MNH1D!} BOOL InitHotkey();
Y(\T-
bI BOOL UnInit();
)BfT7{WN #endif
^ kST
Soie^$
Y //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
{0! ~C=P #include "stdafx.h"
ZVeaTK4_
t #include "hook.h"
Zo KcJA #include <windowsx.h>
~&\ f|% #ifdef _DEBUG
H+
h07\?
% #define new DEBUG_NEW
x8;`i$ #undef THIS_FILE
'0$?h9" static char THIS_FILE[] = __FILE__;
b3wM;jv #endif
{JV@"t-X3" #define MAX_KEY 100
"EU{8b #define CTRLBIT 0x04
G/%iu;7ZCb #define ALTBIT 0x02
>NB?&| #define SHIFTBIT 0x01
%4\OPw& #pragma data_seg("shareddata")
9WJz~SP+vR HHOOK hHook =NULL;
fYE(n8W3 UINT nHookCount =0;
/6O??6g static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
+GsWTEz static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
jGrN\D?h static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
RzhWD^b B static int KeyCount =0;
@"T"7c?Cv static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
i(?,6)9 #pragma data_seg()
{cpEaOyOM HINSTANCE hins;
+n}$pM|NKU void VerifyWindow();
PSawMPw BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
y*{Zbz#{ //{{AFX_MSG_MAP(CHookApp)
Rl|4S[ // NOTE - the ClassWizard will add and remove mapping macros here.
[i0Hm)Bd3 // DO NOT EDIT what you see in these blocks of generated code!
k%y9aO //}}AFX_MSG_MAP
?PTk1sB END_MESSAGE_MAP()
3]-_q"Co4f vzF5xp. CHookApp::CHookApp()
rbT)=-( {
p;?*}xa // TODO: add construction code here,
d--y // Place all significant initialization in InitInstance
x.1-)\ }
!ZDzEP* bqanFQj CHookApp theApp;
O4<g%.HC6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
r%DFve:% {
50dGBF BOOL bProcessed=FALSE;
P;PQeXKw if(HC_ACTION==nCode)
8G>>i)Sbg {
vpPl$ga5bY if((lParam&0xc0000000)==0xc0000000){// Key up
V|)>{Xdn switch(wParam)
VL9-NfeqR {
}HEvr)v9 case VK_MENU:
>zkRcm MaskBits&=~ALTBIT;
@pGZLq break;
"m{,~'x case VK_CONTROL:
7VK}Dy/Vvn MaskBits&=~CTRLBIT;
4'KOpl
K break;
[P|[vWO case VK_SHIFT:
jkiTj~WE- MaskBits&=~SHIFTBIT;
RFh"&0[ break;
rQTr8DYH default: //judge the key and send message
/yLZ/<WN break;
\,!QJp4 }
\.XLcz for(int index=0;index<MAX_KEY;index++){
2cu#lMq if(hCallWnd[index]==NULL)
8 i&_Jgmr continue;
Y-ux7F{=z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+.RKi! {
]4+s$rG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
9;yn}\N ` bProcessed=TRUE;
74<!&t }
PNW \*;j }
TwyM\9l7 }
'gQidf else if((lParam&0xc000ffff)==1){ //Key down
_ >`X]I; switch(wParam)
@v\*AYr'M {
K.gEj*@ case VK_MENU:
@?C#r.vgp MaskBits|=ALTBIT;
,mPnQ? break;
4E44Hzs case VK_CONTROL:
Y+/JsOD MaskBits|=CTRLBIT;
D .vw8H3 break;
E2GGEKrW case VK_SHIFT:
K!D
o8| MaskBits|=SHIFTBIT;
yV)m"j break;
{f9{8-W<u default: //judge the key and send message
0oy-os break;
jClj_E }
]0D}T'wM for(int index=0;index<MAX_KEY;index++)
[6jbgW~E {
ThW,Y"
l if(hCallWnd[index]==NULL)
@1zQce> continue;
*zO&N^X.4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cYNJhGY {
,?
E&V_5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9iN.3/T8 bProcessed=TRUE;
HG/p$L* }
=TR,~8Z| }
w",?
Bef
}
G
;?qWB, if(!bProcessed){
Lw1T 4n for(int index=0;index<MAX_KEY;index++){
l0*Gb if(hCallWnd[index]==NULL)
3CTX -#)vS continue;
4eVI}, if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
bIt=v)%$ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
OPpjuIRv }
n{*e 9Aw }
nZR!*$}A }
s!/TU{8J return CallNextHookEx( hHook, nCode, wParam, lParam );
I[o*RKT'" }
/R
X1UQ.s O!D/|.Q#% BOOL InitHotkey()
u%2<\:~j {
]L2Oz if(hHook!=NULL){
PIcrA2ll nHookCount++;
2EQ6J return TRUE;
HEK-L)S.
* }
l? #xAZx&_ else
}aB#z<B6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
#s5 pz8v if(hHook!=NULL)
Ju@Q6J5 nHookCount++;
F=G{)*Ih return (hHook!=NULL);
*X%m@KLIKv }
P+e KZo BOOL UnInit()
m}VM+= {
{5c]Mn"r if(nHookCount>1){
N#N0Q0W= nHookCount--;
HOt>}x return TRUE;
'#\D]5 }
^=cXo<6D
BOOL unhooked = UnhookWindowsHookEx(hHook);
mN0=i(H< if(unhooked==TRUE){
bM;`s5d nHookCount=0;
%;`>`j5 hHook=NULL;
7J >Gd }
(7lBID4 return unhooked;
~E4"}n[3A# }
oN[Th b
hjZ7= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"$p#&W69"J {
\d.F82 BOOL bAdded=FALSE;
Al)$An- for(int index=0;index<MAX_KEY;index++){
D)='8jV7 if(hCallWnd[index]==0){
0Flu\w/+P hCallWnd[index]=hWnd;
x)5V.q HotKey[index]=cKey;
kL@Wb/K JP HotKeyMask[index]=cMask;
dOa!htx] bAdded=TRUE;
S_J :&9L KeyCount++;
"YFls#4H- break;
#*q2d }
Iyk6=&?j }
LR)&
[{Kk return bAdded;
']51jabm }
#;9H@:N |oKu=/[K BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!7lj>B A> {
.I?@o8'x BOOL bRemoved=FALSE;
c $;\i for(int index=0;index<MAX_KEY;index++){
TmEYW< if(hCallWnd[index]==hWnd){
5#:pT if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
"#^MUQ!a hCallWnd[index]=NULL;
Dxx;v .$ HotKey[index]=0;
5?u[XAE HotKeyMask[index]=0;
p(3sgY1 bRemoved=TRUE;
_[Gb)/@mM KeyCount--;
:,]S}R break;
>POO-8Q }
f~& a- }
u'9gVU B }
dK?);*w] return bRemoved;
D\L!F6taS }
Yt1mB[&f^ N}/>r D void VerifyWindow()
8q_0,>w% {
1/j$I~B for(int i=0;i<MAX_KEY;i++){
euRss#; if(hCallWnd
!=NULL){ /MMtTB
H
if(!IsWindow(hCallWnd)){ DMgBcP
hCallWnd=NULL; o 5Zyh26
HotKey=0; [$:,-Q @
HotKeyMask=0; "h$R ]~eG
KeyCount--; :=g.o;(/N
} ?#[)C=p]z
} c;!g
} Vb6K:ZnF
} #;j9}N
T`L}[?w
BOOL CHookApp::InitInstance() vb =CFV#
{ VZxTx0: ,
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4KIWb~0Y
hins=AfxGetInstanceHandle(); Cyk s
InitHotkey(); 'Tf9z+0;
return CWinApp::InitInstance(); _'iDF
} HFh /$VM
f'/ KMe%<
int CHookApp::ExitInstance() 2ChWe}f
{ /5a;_
VerifyWindow(); tjzA)/T,4
UnInit(); }OKL
z.5
return CWinApp::ExitInstance(); XCPb9<L
} '"O&J}s;
T&}Ye\%
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V:^H4WvL\W
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9`X&,S~e
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ N=fz/CD)I
#if _MSC_VER > 1000 -q2MrJ*
#pragma once $adq7
#endif // _MSC_VER > 1000 mZoD033H
h)B!LAr
class CCaptureDlg : public CDialog 9]~PCZ2j
{ gA
+:CgQ
// Construction OD4W}Y.
public: jb@\i@-
BOOL bTray; {g=b]yg\o
BOOL bRegistered; ,?=KgG1i
BOOL RegisterHotkey(); E`E'<"{Yd
UCHAR cKey; H1UL.g%d=
UCHAR cMask; Z`xyb>$
void DeleteIcon(); gduxA/aT
void AddIcon(); |HgfV@Han
UINT nCount; oS!/|#mn
void SaveBmp(); ]Y5dl;xrM)
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;/A}}B]y
// Dialog Data 1M+Zkak7p
//{{AFX_DATA(CCaptureDlg) NhlJ3/J j
enum { IDD = IDD_CAPTURE_DIALOG }; @
R'E?|
CComboBox m_Key; pI^=B-7
BOOL m_bControl; nZW4} ~0j
BOOL m_bAlt; wiV&xl
BOOL m_bShift; 5Fe-=BX(
CString m_Path; Qx.jCy@
CString m_Number; 4!'1/3cY
//}}AFX_DATA m^0A?jBrR
// ClassWizard generated virtual function overrides Qv !rUiXq
//{{AFX_VIRTUAL(CCaptureDlg) pGk"3.ce
public: 'wE\{1~_[+
virtual BOOL PreTranslateMessage(MSG* pMsg); ]L]T>~X`
protected: |>JmS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 24|<<Xn
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {d}26 $<$]
//}}AFX_VIRTUAL {{zua-F
// Implementation r`>~Lp`
protected: nOuN|q=C
HICON m_hIcon; 2mOfsn d@
// Generated message map functions AO8:|?3S
//{{AFX_MSG(CCaptureDlg) Tg\hx>
virtual BOOL OnInitDialog(); @ V5S4E
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =#'+"+lQ }
afx_msg void OnPaint(); GU#Q}L2
afx_msg HCURSOR OnQueryDragIcon(); !h/dZ`#
virtual void OnCancel(); pP
oxVvG{
afx_msg void OnAbout(); e5qvyUJM
afx_msg void OnBrowse(); {jUvKB_x
afx_msg void OnChange(); Ps |QW
//}}AFX_MSG Ei~]iZ}
DECLARE_MESSAGE_MAP() yUj;4vd
}; o3= .T+B
#endif '}fel5YV
5Q;dnC
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file hgif]?:C<
#include "stdafx.h" 1l~.R#W G&
#include "Capture.h" PIpWa$b
#include "CaptureDlg.h" rJp?d9B
#include <windowsx.h> ZU^Q1}</5
#pragma comment(lib,"hook.lib") A ')(SGSc
#ifdef _DEBUG 5
2fO)!
#define new DEBUG_NEW Nq
U9/
#undef THIS_FILE 6BHPzv+Y
static char THIS_FILE[] = __FILE__; .Wh6(LDY(
#endif Q%$i@JH`m
#define IDM_SHELL WM_USER+1 M3PVixli3
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LNbx3W
oC
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R>` ih&,)
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8|Q4-VK<!
class CAboutDlg : public CDialog IwnYJp:9v
{ Ta,u-!/I
public: y!BB7cK6
CAboutDlg(); n<+~ zQ
// Dialog Data iF+S%aPd#
//{{AFX_DATA(CAboutDlg) 'bG1U`v=3
enum { IDD = IDD_ABOUTBOX }; (T4k~T`3
//}}AFX_DATA UT% #K %
// ClassWizard generated virtual function overrides I}1fEw>8
//{{AFX_VIRTUAL(CAboutDlg) ?Ip$;s
protected: i"KL;t[1
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AwA1&mh
//}}AFX_VIRTUAL vB]3Xb3a
// Implementation vr<)Ay
protected: W3aXW,P. V
//{{AFX_MSG(CAboutDlg) 7kOE/>P?
//}}AFX_MSG Kl!DKeF
DECLARE_MESSAGE_MAP() w# xncH:1
}; &~42T}GTWG
=CGD
~p`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (PyTq
5:F
{ !;ZBL;qY9
//{{AFX_DATA_INIT(CAboutDlg) r$Yh)rpt:
//}}AFX_DATA_INIT NH<Y1t
} ?@yank|
<)=3XEcb
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |:\$n}K
{ tc!!W9{69
CDialog::DoDataExchange(pDX); 77 *v-8c
//{{AFX_DATA_MAP(CAboutDlg) '"'D.,[W2
//}}AFX_DATA_MAP (xjqB{U
} 6MrZ6dz^
#R5we3&p
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Qs~d_;
//{{AFX_MSG_MAP(CAboutDlg) |qQ{ 8T%)
// No message handlers ;,()wH
//}}AFX_MSG_MAP 5XhK#X%:A
END_MESSAGE_MAP() i#Ne'q;T
ll 6]W~[ZC
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EaJDz`T}
: CDialog(CCaptureDlg::IDD, pParent) ~r{\WZ.
{ J~M H_N
//{{AFX_DATA_INIT(CCaptureDlg) |;X?">7NW
m_bControl = FALSE; .ou!g&xu
m_bAlt = FALSE; 8 /5sv
m_bShift = FALSE; qr7 X-[&
m_Path = _T("c:\\"); L?AM&w-cg9
m_Number = _T("0 picture captured."); -ryDsq
nCount=0; Tyg$`\#
bRegistered=FALSE; /h1dm,
bTray=FALSE;
yBJ/>SAcG
//}}AFX_DATA_INIT +e&m#d
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~W]#9&yQ
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~R"]LbeY
} :|*Gnu
/8 e2dw:
\
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s
ZlJ/_g
{ OHx,*}N
CDialog::DoDataExchange(pDX); /&S~+~]n
//{{AFX_DATA_MAP(CCaptureDlg) *#ob5TBq[
DDX_Control(pDX, IDC_KEY, m_Key); n1fEdaa7g
DDX_Check(pDX, IDC_CONTROL, m_bControl); {QIS411
DDX_Check(pDX, IDC_ALT, m_bAlt); !N@S^JD6
DDX_Check(pDX, IDC_SHIFT, m_bShift); z }FiU[Hs
DDX_Text(pDX, IDC_PATH, m_Path); UrD=|-r`
DDX_Text(pDX, IDC_NUMBER, m_Number); yEMX `
//}}AFX_DATA_MAP !D.= 'V
} i}v}K'`
$.suu^>^w
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )nf=eU4|
//{{AFX_MSG_MAP(CCaptureDlg) [
t>}SE
ON_WM_SYSCOMMAND() aYv'H
ON_WM_PAINT() UE}8Rkt
ON_WM_QUERYDRAGICON() L:|X/c9r[
ON_BN_CLICKED(ID_ABOUT, OnAbout) EqNz L*E
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]Ct`4pA
ON_BN_CLICKED(ID_CHANGE, OnChange) =
]dz1~/
//}}AFX_MSG_MAP c,3'wnui
END_MESSAGE_MAP() 0})7of
xI.Orpw
BOOL CCaptureDlg::OnInitDialog() 4?P%M"\Iv
{ Fi?U)T+%+
CDialog::OnInitDialog(); sw 3:HNG=
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j]@x Q,y
ASSERT(IDM_ABOUTBOX < 0xF000); INN/VDsJ
CMenu* pSysMenu = GetSystemMenu(FALSE); >o0&:h|>$'
if (pSysMenu != NULL) !0>!tW
{
L@g Q L
CString strAboutMenu; 35]j;8N:
strAboutMenu.LoadString(IDS_ABOUTBOX); 2XETQ; 9
if (!strAboutMenu.IsEmpty()) =hZ&66
{ ft~|
pSysMenu->AppendMenu(MF_SEPARATOR); CP F>^Mp#
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); xdFP$Y~ogy
} UY }9
} X\c1q4oB[
SetIcon(m_hIcon, TRUE); // Set big icon PsF- 9&_
SetIcon(m_hIcon, FALSE); // Set small icon @1J51< x
m_Key.SetCurSel(0); $ g1wK}B3
RegisterHotkey(); s/W!6JX4
CMenu* pMenu=GetSystemMenu(FALSE); YYZs#_
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); EyKkjEXx_
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *<|~=*Ddf
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); l1+w2rd1
return TRUE; // return TRUE unless you set the focus to a control Q%X:5G?
} kb>Vw<NtE
$ly#zQR
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <ZHY3
{ lzr>WbM{{p
if ((nID & 0xFFF0) == IDM_ABOUTBOX) :$GL.n-?
{ mCC:}n"#
CAboutDlg dlgAbout; "2vNkO##
dlgAbout.DoModal(); =hOj8;2
} A/Fs?m{7U
else yPzULO4
{ I9Edw]
CDialog::OnSysCommand(nID, lParam); ~q'w),bE"Q
} t9$AvE#a!=
} ]sm0E@ 1
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void CCaptureDlg::OnPaint() ;S{Ld1;
{ 0%qctZy
if (IsIconic()) k
Nf!j
{ ^t^<KL;
CPaintDC dc(this); // device context for painting QvK]<HEr
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Y|x6g(b
// Center icon in client rectangle Us@ {w`T
int cxIcon = GetSystemMetrics(SM_CXICON); [X$|dOm'N
int cyIcon = GetSystemMetrics(SM_CYICON); 0?&aV_:;X
CRect rect; a\[fC=]r:
GetClientRect(&rect); mNBpb}
int x = (rect.Width() - cxIcon + 1) / 2; x jP" 'yU
int y = (rect.Height() - cyIcon + 1) / 2; @LkW_
// Draw the icon ![X.%
dc.DrawIcon(x, y, m_hIcon); ]Nd'%M
} tx|"v|&e2
else 2'O!~8U
{ yaYIgG
CDialog::OnPaint();
J7
*G/F
} UtGd/\:
} n/-p;#R
2Xj-A\Oh~
HCURSOR CCaptureDlg::OnQueryDragIcon() v @I^:I
{ (
F"& A?
return (HCURSOR) m_hIcon; ^RFmRn
} KoQ_:`
*`pec3"
void CCaptureDlg::OnCancel() 3MBz
{ P7BJ?x
if(bTray) ru6H nLhL
DeleteIcon(); t+4%,n f_1
CDialog::OnCancel(); gS(: c.
} %;B(_ht<-w
vCU&yXGl
void CCaptureDlg::OnAbout() i>kNz(*
{ :;hBq4h
CAboutDlg dlg; 8HH.P`Vk#
dlg.DoModal(); 9 (FcA5Y
} BB73'W8y
te)g',#lT
void CCaptureDlg::OnBrowse() $nD k
mKl
{ s$nfY.C
CString str; pg}DC0a
BROWSEINFO bi; MS*Mem,
char name[MAX_PATH]; Q&U= jX
ZeroMemory(&bi,sizeof(BROWSEINFO)); as!|8JE`
bi.hwndOwner=GetSafeHwnd(); I`n1M+=%
bi.pszDisplayName=name; +IOKE\,Y
bi.lpszTitle="Select folder"; ]zM90$6
bi.ulFlags=BIF_RETURNONLYFSDIRS; 4S{l>/I
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ['N#aDh.?
if(idl==NULL) UXdC<(vK
return; *!7SM7
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {*=5qV}
str.ReleaseBuffer(); FUTyx"
m_Path=str; hwol7B>
if(str.GetAt(str.GetLength()-1)!='\\') C6T 9
m_Path+="\\"; Om?:X!l"
UpdateData(FALSE); 0,D9\ Ebd
} @}rfY9o'
dU04/]modD
void CCaptureDlg::SaveBmp() [ Xo
J7
{ GL0' :LsZ
CDC dc; { G>+.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); },QFyT
CBitmap bm; iNrmhiql
int Width=GetSystemMetrics(SM_CXSCREEN); }-]s#^'w
int Height=GetSystemMetrics(SM_CYSCREEN); Rx"VscB6z
bm.CreateCompatibleBitmap(&dc,Width,Height); fS$Yl~-m?
CDC tdc; V{aIhH>P
tdc.CreateCompatibleDC(&dc); }y=n#%|i.
CBitmap*pOld=tdc.SelectObject(&bm); k3|9U'r!c
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); b!tZ bX#
tdc.SelectObject(pOld); E6&uZr
BITMAP btm; r Xk
bm.GetBitmap(&btm); s].Cx4VQ
DWORD size=btm.bmWidthBytes*btm.bmHeight; 0#[Nfe*
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [.#$hOsNR
BITMAPINFOHEADER bih; 'w$we6f
bih.biBitCount=btm.bmBitsPixel; apWrcaj
bih.biClrImportant=0; @Oc}\Rg
bih.biClrUsed=0; 6I.+c
bih.biCompression=0; '~6CGqU*
bih.biHeight=btm.bmHeight; 0PX@E-n
bih.biPlanes=1; 1ZH8/1gWI
bih.biSize=sizeof(BITMAPINFOHEADER); 58gt*yVu
bih.biSizeImage=size; vH\nL>r
bih.biWidth=btm.bmWidth; O7_NXfh|
bih.biXPelsPerMeter=0; K]azUK7
bih.biYPelsPerMeter=0; }j<_JI
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9mtC"M<
static int filecount=0; o>k-~v7
CString name; u^eC
name.Format("pict%04d.bmp",filecount++); _"e(
^yiK
name=m_Path+name; vH:+
BITMAPFILEHEADER bfh; KB-#):'
bfh.bfReserved1=bfh.bfReserved2=0; HQ#L
|LN
bfh.bfType=((WORD)('M'<< 8)|'B'); VQJ5$4a&
bfh.bfSize=54+size; 3G0\i!*t
bfh.bfOffBits=54; [8g\pPQ
CFile bf; sy#j+gZ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;."{0gq
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); w5G34[v
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2F)OyE
bf.WriteHuge(lpData,size); .\\#~r`t 3
bf.Close(); /]58:euR
nCount++; G!lykk]
} /u1zRw
GlobalFreePtr(lpData); WQ`P^5e
if(nCount==1) Z"&ODVP
m_Number.Format("%d picture captured.",nCount); wx7>0[ zE
else KD<`-b)7<
m_Number.Format("%d pictures captured.",nCount); JZ0+VB-3U
UpdateData(FALSE); !Dn1pjxc
} |&*rSp2iH
IZ ha* 7
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T{2//$T?
{ jtC ob'n8
if(pMsg -> message == WM_KEYDOWN) yq^$H^_O
p
{ ^*>no=A
if(pMsg -> wParam == VK_ESCAPE) =7Gi4X%
return TRUE; fH{$LjH(
if(pMsg -> wParam == VK_RETURN) xo3)dsX
return TRUE; X7!A(q+h
} *VAi!3Rx;
return CDialog::PreTranslateMessage(pMsg); i;
uM!d}
} ;Awzm )Q
;{u#~d}
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (
I~XwP&
{ )u:8Pv
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6q7Y`%j
SaveBmp(); l@9:VhU(
return FALSE; _E-GHj>k
z
} SQCuY<mD
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E0'6 !9y
CMenu pop; ::t!W7W
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bJ[1'Es`
CMenu*pMenu=pop.GetSubMenu(0); \3UdC{~
pMenu->SetDefaultItem(ID_EXITICON); 5WX2rJ8z
CPoint pt; nsn,8a38
GetCursorPos(&pt); gU$3Y#R
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +PD5pr
if(id==ID_EXITICON) SaScP
DeleteIcon(); rV{e[fGd
else if(id==ID_EXIT) N1+]3kt ~
OnCancel(); N1t:i? q&
return FALSE; je0 ?iovY
} Tdp$laPO'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q 7?4GxMj
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0;`PHNBq
AddIcon(); UzRF'<TWf
return res; S!c@6&XJm?
} @uWD>(D
<0MUn#7'
void CCaptureDlg::AddIcon() Kn]WXc|("
{ hj[g2S%X
NOTIFYICONDATA data; }e6:&`a xD
data.cbSize=sizeof(NOTIFYICONDATA); 3@A k6Uh
CString tip; s;)tLJ!
tip.LoadString(IDS_ICONTIP); <i?-x&Q?=
data.hIcon=GetIcon(0); Z ISd0hV
data.hWnd=GetSafeHwnd(); 'S
;vv]}Gs
strcpy(data.szTip,tip); {uG_)G Fr0
data.uCallbackMessage=IDM_SHELL; g9Ll>d)tE3
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L 32ki}2
data.uID=98; 79fg%cSb
Shell_NotifyIcon(NIM_ADD,&data); +{*&I DW
ShowWindow(SW_HIDE); u-<s@^YG
bTray=TRUE; L~zet-3UNf
} 6ns_4,
e
a&PZ7!PZv
void CCaptureDlg::DeleteIcon() :H7 "W<
{ "d\8OOU
NOTIFYICONDATA data; (/BkwbJyE
data.cbSize=sizeof(NOTIFYICONDATA); Ke!O^zP92
data.hWnd=GetSafeHwnd(); D~,R@7
data.uID=98; T9.gs}B0
Shell_NotifyIcon(NIM_DELETE,&data); x F#)T*
ShowWindow(SW_SHOW); w, wt<@}
SetForegroundWindow(); C<)&qx3
ShowWindow(SW_SHOWNORMAL); vUNE!j
bTray=FALSE; pu#<qD*w
} |0
VP^md
{,X(fJ
void CCaptureDlg::OnChange() sa?;D
{ %stktVDAP
RegisterHotkey(); b
/ySt<
} 4j{ }{
Hs` '](
BOOL CCaptureDlg::RegisterHotkey() )}8%Gs4C
{ r~t7Z+PXF
UpdateData(); W_EN4p~J
UCHAR mask=0; >?V->7QLP
UCHAR key=0; _!D$Aj
if(m_bControl) Ky|0IKE8Z
mask|=4; |szfup~5es
if(m_bAlt) VN;M;fMs
mask|=2; u,q#-d0g;
if(m_bShift) )c/BDC7g
mask|=1; tIw4V^'|
key=Key_Table[m_Key.GetCurSel()]; H9?~#GPb
if(bRegistered){ cR} =3|t
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~+hG}7(:
bRegistered=FALSE; k[m-"I%ZFX
} #Ba'k6b
cMask=mask; 3@JwL{C
cKey=key; 3WHH3co[
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); w4mL/j
return bRegistered; |d8o<Q
} vC1 `m
(@9-"W
四、小结 `x3c},'@k
&~EOM
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。