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:
Pp1HOJYJp0
MK7S*N1 一、实现方法
>(Jy=m? QA\eXnR 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:
/u{ 9UR[g ,JyE7h2%i #pragma data_seg("shareddata")
u1O?` HHOOK hHook =NULL; //钩子句柄
Q@hx+aM UINT nHookCount =0; //挂接的程序数目
4lH$BIAW static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Wq8Uq}~_g static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
RG|]Kt8 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
#q40 >)] static int KeyCount =0;
a0OH static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
=1fO"|L #pragma data_seg()
9:CJl6~N)# A@#9X'C$^ 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。
d paZ6g K~OfC 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:
)Ac+5bs N7k<q=r- BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
%>}6>nT# cKey,UCHAR cMask)
6*Jd8Bva\o {
,T?8??bZ BOOL bAdded=FALSE;
|&WeXVH E for(int index=0;index<MAX_KEY;index++){
AxLnF(eG if(hCallWnd[index]==0){
:-7`Lfi@% hCallWnd[index]=hWnd;
'WkDpa HotKey[index]=cKey;
JzMPLmgG/ HotKeyMask[index]=cMask;
:\x53-&hO4 bAdded=TRUE;
5FcKY_ KeyCount++;
Zso&.IATng break;
qlmz@kTb }
[_Y\TdR }
gE]) z*tqX return bAdded;
x; 89lHy@e }
{; ]:}nA //删除热键
pzmm cjEC BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\^vf`-uG {
U8kH'OD BOOL bRemoved=FALSE;
O79;tA<k for(int index=0;index<MAX_KEY;index++){
'`$a l7D if(hCallWnd[index]==hWnd){
?#ue:O1 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)vO;=%GQ hCallWnd[index]=NULL;
/`#sp HotKey[index]=0;
@kC>+4s! HotKeyMask[index]=0;
Lc(D2=% bRemoved=TRUE;
[4sI<aH KeyCount--;
I^sWf3'db break;
9B")/Hz_ }
_;",7bT80 }
2
|w;4 }
_XIls*6AK return bRemoved;
6*%3O=* }
-q\5)nY FCTz>N^p :Jwc'y-] DLL中的钩子函数如下:
xnWCio>M #k5WTcE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
oB;EP {
a(&!{Y1bt BOOL bProcessed=FALSE;
|xyr6gY if(HC_ACTION==nCode)
lob{{AB,! {
&hWLG<IE if((lParam&0xc0000000)==0xc0000000){// 有键松开
w#g0nV"X6 switch(wParam)
~(kIr?^ {
/WXy!W30< case VK_MENU:
"ut:\%39. MaskBits&=~ALTBIT;
\)859x&( break;
j%Mz;m4y case VK_CONTROL:
pvM;2 MaskBits&=~CTRLBIT;
~Fv&z'R break;
vUl5%r2O4 case VK_SHIFT:
H S/1z MaskBits&=~SHIFTBIT;
g9(zJ break;
AEaT default: //judge the key and send message
[b-27\b break;
E;\XZ<E }
c(Zar&z,E for(int index=0;index<MAX_KEY;index++){
0:UK)t)3I if(hCallWnd[index]==NULL)
iaO;i1K5U continue;
,
"w`,c>! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z)"7qqA {
CZyOAoc< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^~}|X%q3 bProcessed=TRUE;
bUbM } }
z!27#gbL }
_l,?Y;OF }
:UMg5eZ else if((lParam&0xc000ffff)==1){ //有键按下
+RS>#zd/= switch(wParam)
3)v6N_ {
} Zu2GU$6 case VK_MENU:
6J0HaL MaskBits|=ALTBIT;
~8~B VwZ_ break;
+%(iGI{ case VK_CONTROL:
qp
(ng8%c MaskBits|=CTRLBIT;
(UmoG break;
eA9U|&o case VK_SHIFT:
E< nXkqD MaskBits|=SHIFTBIT;
2h0I1a,7 break;
[tDUR default: //judge the key and send message
opTDW) break;
H6?ZE }
a*JM2^,HO for(int index=0;index<MAX_KEY;index++){
Rro|P_ if(hCallWnd[index]==NULL)
3;=nQ{0b continue;
p%e!&:! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
']^e,9=Q {
cAJKFuX" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-}|GkTM bProcessed=TRUE;
1BQTvUAA }
^c{}G<U^ }
=
aSHb[hO }
Jhu<^pjs if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
,t5X'sY L for(int index=0;index<MAX_KEY;index++){
~d6_ if(hCallWnd[index]==NULL)
AH`D&V continue;
BX$t |t;!m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
P{mV SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
{V%ZOdg9 //lParam的意义可看MSDN中WM_KEYDOWN部分
@-~YQ@08` }
@
fm\
H }
VpSk.WY/ e }
G3&ES3L return CallNextHookEx( hHook, nCode, wParam, lParam );
jfF,:(P%W }
@<Au|l` vco/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:
Y'"2s~_
Z ?^P#P0 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
t$=FcKUV}f BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LB%_FT5 *)"U5A/v) 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
?cdSZ'49[ -H~g+i*J LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
0?l|A1I% {
+kTAOfM if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
>|SB]'C| {
] ,Wh]q //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
D4'"GaCv SaveBmp();
f ^mxj/%L return FALSE;
!OM9aITv[ }
p%Ae"#_X% …… //其它处理及默认处理
^T"9ZBkb }
VHVU*6_w WpC@nz? [bkMl+:/HG 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
@8C^[fDL ]3hz{zqV^ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
=N01!?{ A@*P4E`xp 二、编程步骤
8h9t8? m
s\:^a 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
XG<J'3 #{7= 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
VBR@f<2L #/sKb2eQ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
*{tn/ro6a M]!\X6<_ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
S]ZO*+ w( `X P 5、 添加代码,编译运行程序。
&5/`6-K #O]F5JB 三、程序代码
\*6%o0c ^ef:cS$; ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
,^O**k9F #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
KrVF>bq+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
R?1;'pvpa[ #if _MSC_VER > 1000
1JgnuBX" #pragma once
oTo'? E# #endif // _MSC_VER > 1000
=Y|TShKk #ifndef __AFXWIN_H__
CU6rw+Vax #error include 'stdafx.h' before including this file for PCH
hbR;zV|US #endif
Zb-TCS+3l #include "resource.h" // main symbols
8<3J!X+ class CHookApp : public CWinApp
k='sI^lF {
FB@c
+*1 public:
Svn|vH CHookApp();
iKV;>gF,)v // Overrides
#!h:w // ClassWizard generated virtual function overrides
~CldqXeI //{{AFX_VIRTUAL(CHookApp)
*j><a public:
O<S*bN>BF virtual BOOL InitInstance();
Yg/e 8Q2 virtual int ExitInstance();
h3aHCr E //}}AFX_VIRTUAL
ru3nnF_I //{{AFX_MSG(CHookApp)
&PD4+%! // NOTE - the ClassWizard will add and remove member functions here.
En+4@BC // DO NOT EDIT what you see in these blocks of generated code !
&GwBxJ
//}}AFX_MSG
X1:| DECLARE_MESSAGE_MAP()
n?&G>`u* };
QpS0iUG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=Xm
[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v[CX-CBZ? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
ujB:G0'r BOOL InitHotkey();
Um;ReJ8z BOOL UnInit();
j9%u& #endif
.qy._C2(
M]jzbJ3Q //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
$rs7D}VNc #include "stdafx.h"
Mp?Ev. #include "hook.h"
Y%p"RB[ #include <windowsx.h>
Slq=;TDp #ifdef _DEBUG
u%5B_<90V #define new DEBUG_NEW
#93;V'b] #undef THIS_FILE
,nMLua\ static char THIS_FILE[] = __FILE__;
/+2^xEIjE #endif
J[L$8y: #define MAX_KEY 100
f!P.=Qo[= #define CTRLBIT 0x04
s
ZkQJ-> #define ALTBIT 0x02
LGK0V!W #define SHIFTBIT 0x01
IyOujdKa #pragma data_seg("shareddata")
6;dB HHOOK hHook =NULL;
%,a.431gi UINT nHookCount =0;
T9{94Ra static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
VyCBJK static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
"pdG%$ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
XIJ>\ RF static int KeyCount =0;
j !&g:{ e static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
q{@>2AlK #pragma data_seg()
ub}t3# HINSTANCE hins;
Y!i4P#4+q void VerifyWindow();
KL sTgo|J BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
/,2Em> //{{AFX_MSG_MAP(CHookApp)
.pu]21m= // NOTE - the ClassWizard will add and remove mapping macros here.
yXc/Nl% // DO NOT EDIT what you see in these blocks of generated code!
+q)
^pCC //}}AFX_MSG_MAP
`"I^nD^t>Y END_MESSAGE_MAP()
NJs )2 ;.!AX|v CHookApp::CHookApp()
jFw?Ky2 {
$>OWGueq64 // TODO: add construction code here,
b,D+1' // Place all significant initialization in InitInstance
Wh(V?!^@5 }
Sq-mH=rs] LEc%BQx CHookApp theApp;
$oq&uL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8NPt[* {
vhTte
|( BOOL bProcessed=FALSE;
m$*dPje if(HC_ACTION==nCode)
u_e}m>[S {
Th`IpxV if((lParam&0xc0000000)==0xc0000000){// Key up
TTmNPp4q switch(wParam)
fseHuL=~ {
<2diO= case VK_MENU:
"%<Oadz ap MaskBits&=~ALTBIT;
[#)-F_S break;
@4T+0&OI10 case VK_CONTROL:
pUYa1 = MaskBits&=~CTRLBIT;
m-5Dbx!j break;
6Ei>VcN4a case VK_SHIFT:
^&h|HO-5 MaskBits&=~SHIFTBIT;
f`RcfYt break;
bf'@sh%W default: //judge the key and send message
N02N
w(pi break;
u <%,Ql }
Goz9"yazg for(int index=0;index<MAX_KEY;index++){
!R[o6V5T if(hCallWnd[index]==NULL)
My:wA;# continue;
]5YG*sD4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
M!,$i {
F,P,dc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#8%Lc3n bProcessed=TRUE;
. AWRe1? }
1;4TA}'H }
Q^DKKp }
IpB0~`7YI else if((lParam&0xc000ffff)==1){ //Key down
?X]7jH<iw; switch(wParam)
d;
oaG (e {
hoO8s#0ED case VK_MENU:
Tr(w~et MaskBits|=ALTBIT;
9%$4Ux*q break;
31
QT case VK_CONTROL:
A>xFNem MaskBits|=CTRLBIT;
G3OqRH break;
06]J] case VK_SHIFT:
S)n~^q MaskBits|=SHIFTBIT;
O6YYOmt3 break;
(Y)$+9 default: //judge the key and send message
RnIL>Akp break;
Xi6XV3G }
{&4+W=0
n for(int index=0;index<MAX_KEY;index++)
ZxwI< T:& {
IyL2{5 if(hCallWnd[index]==NULL)
=sG C continue;
@2L+"=u# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
mG1=8{o^ {
](aXZ<, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Ih{(d O; bProcessed=TRUE;
\6T&gX }
WDP$w(M }
mKvk6OC }
#:v|/2 if(!bProcessed){
(m|p|rL for(int index=0;index<MAX_KEY;index++){
2Rc#{A if(hCallWnd[index]==NULL)
*FQrmdwb]L continue;
f]qPxRw if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
2p Q
zT SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
f-k%P$"X& }
dArg'Dc4 }
Cz+`C9# }
2LiJ IO8N return CallNextHookEx( hHook, nCode, wParam, lParam );
MIsjTKE }
{uM*.]
^I5k+cL BOOL InitHotkey()
AcwLs%'sx {
dli?/U@hO if(hHook!=NULL){
_Q t nHookCount++;
lSPQXu*[ return TRUE;
D2# 3fM6 }
yS0!#AG else
]t=m hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
A%-*M 'J if(hHook!=NULL)
k^w!|%a[ nHookCount++;
9G[!"eZ} return (hHook!=NULL);
`%ZM(9T }
Ovxs+mQ BOOL UnInit()
7.,C'^ci {
[o<Rgq4 if(nHookCount>1){
C?fd.2#U nHookCount--;
FMc$?mm return TRUE;
@!=q.4b }
o+*YX!]#L BOOL unhooked = UnhookWindowsHookEx(hHook);
az*c0Z<pl if(unhooked==TRUE){
Sp]"Xr) nHookCount=0;
w<!F& kQB hHook=NULL;
C*a>B,H }
}xk85*V return unhooked;
-,)&?S }
fa//~$#"{L :XC~G&HuF6 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
--6C>iY[&u {
-y|>#`T/ BOOL bAdded=FALSE;
[_Fj2nb* for(int index=0;index<MAX_KEY;index++){
r5M {* if(hCallWnd[index]==0){
QbjO*:c4 hCallWnd[index]=hWnd;
(u-K^xC HotKey[index]=cKey;
sG7G$G*ta! HotKeyMask[index]=cMask;
1xP* bAdded=TRUE;
~2PD%+e7] KeyCount++;
pX8TzmIB0 break;
2w_[c. }
O`j1~o<{ }
wW
EnAW~ return bAdded;
% CV@FdB }
-N
$4\yp OyH>N/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
$REz{xgA= {
X
[IVK~D}z BOOL bRemoved=FALSE;
NX%"_W/W for(int index=0;index<MAX_KEY;index++){
o-a\T if(hCallWnd[index]==hWnd){
He vZ}. if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
td JA? hCallWnd[index]=NULL;
JN)@bP HotKey[index]=0;
U2<8U HotKeyMask[index]=0;
2n+tc bRemoved=TRUE;
$ha,DlN KeyCount--;
x7J8z\b"O break;
l7 Pn5c }
o5LyBUJ }
G%ytp=N }
/|Z_Dy return bRemoved;
GB,f'Afl }
znnnqR0us 'tvX.aX2 void VerifyWindow()
V1di#i: {
f$1&)1W[ for(int i=0;i<MAX_KEY;i++){
q> |&u
if(hCallWnd
!=NULL){ NH9"89]E
if(!IsWindow(hCallWnd)){ mO<1&{qMZ
hCallWnd=NULL; g?B4b7II
HotKey=0; 0RFBun{
HotKeyMask=0; =Ot|d #_
KeyCount--; RGEgYOO
} 3D 4-Wo4
} j/ [V<
} C- 5QhD
} rf?%- X(V
pLj[b4p9
BOOL CHookApp::InitInstance() M/?eDW/
{ fVf
@Ngvu
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5tx!LGOK
hins=AfxGetInstanceHandle(); sbv2*fno5
InitHotkey(); w3Lr~_j
return CWinApp::InitInstance(); IVSOSl|
} HOt,G
_{
&?g!)O
int CHookApp::ExitInstance() y'L7o
V?L9
{ (yrN-M4~t
VerifyWindow(); 1A%0y)]
UnInit(); ;n,xu0/
return CWinApp::ExitInstance(); /U26IbJ
} qXqGhHoe;
#ZkT![`
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |P0!dt7sQ
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A(eB\qG
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sGFvSW
#if _MSC_VER > 1000 (^pIB~.z
#pragma once \uPyvA=
#endif // _MSC_VER > 1000 7f] qCZ<0V
&cGa~#-u
class CCaptureDlg : public CDialog {ty)2
{ qP{Fwn
// Construction 3 C{A
public: CS'LW;#[
BOOL bTray; rMWJ
BOOL bRegistered; f+!k:}K
BOOL RegisterHotkey(); Ie4\d2tQ;
UCHAR cKey; @yM$Et5
UCHAR cMask; mF:Pplf<
void DeleteIcon(); 5o6X.sC8e
void AddIcon(); 60TM!\
UINT nCount; GJ5R <f9I
void SaveBmp(); ui
RO,B}z
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \&_pI2X
// Dialog Data sZx`u+
//{{AFX_DATA(CCaptureDlg) 12VIP-ABK
enum { IDD = IDD_CAPTURE_DIALOG }; %rlMjF'tG
CComboBox m_Key; )x+P9|
BOOL m_bControl; j*\oK@
BOOL m_bAlt; {oSdVRI
BOOL m_bShift; p$=Z0p4%LL
CString m_Path; dd=ca0c7e
CString m_Number; ''dS{nQs
//}}AFX_DATA Al1_\vx7
// ClassWizard generated virtual function overrides `>0%Ha
//{{AFX_VIRTUAL(CCaptureDlg) Vy=P*
public: .Hnhd/ c
virtual BOOL PreTranslateMessage(MSG* pMsg); d.|*sZ&3p
protected: nW)?cQ
I
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _h+7KK
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nll=Vd[
//}}AFX_VIRTUAL !RP0W
// Implementation r]@T9\9
protected: IClw3^\l
HICON m_hIcon;
STl8h}C
// Generated message map functions IaZmN.k*
//{{AFX_MSG(CCaptureDlg) C7O8B;
virtual BOOL OnInitDialog(); Y'{}L@"t
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C$p012D1
afx_msg void OnPaint(); m%0_fNSJ
afx_msg HCURSOR OnQueryDragIcon(); X J`*dgJ
virtual void OnCancel(); 5vFM0
afx_msg void OnAbout(); +BeA4d8b
afx_msg void OnBrowse(); #{*5rKiL
afx_msg void OnChange(); _@i-?Q
//}}AFX_MSG %~I&T".iC
DECLARE_MESSAGE_MAP() up{0ehr
}; "cyRzQ6EH
#endif o}DRp4;Ka
_Pno9|
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Zs(BViTb|
#include "stdafx.h" c2t`i
#include "Capture.h" [>N#61CV5
#include "CaptureDlg.h" 7]} I
#include <windowsx.h> kebk f,`p
#pragma comment(lib,"hook.lib") ,hH c
-%-
#ifdef _DEBUG #|K{txC
#define new DEBUG_NEW 2Z(t/Zp>
#undef THIS_FILE 8 :WN@
static char THIS_FILE[] = __FILE__; Siq]Ii0F;>
#endif j,Mbl"P
#define IDM_SHELL WM_USER+1 vh.-9eD
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [;yKbw!C
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); EnGh&]
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O1UArD
class CAboutDlg : public CDialog ber&!9
{ )!kt9lK
public: L pq)TE#
CAboutDlg(); @ R[K8
// Dialog Data ~n8UN<
//{{AFX_DATA(CAboutDlg) ;O1jf4y
enum { IDD = IDD_ABOUTBOX }; wK0x\V6dJ
//}}AFX_DATA ^ ^&H:q
// ClassWizard generated virtual function overrides J6[}o4Z
//{{AFX_VIRTUAL(CAboutDlg) e]nP7TIU
protected: /Yb8= eM
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?%`Ph ?BZl
//}}AFX_VIRTUAL -.r"|\1X
// Implementation )u+O~Y95&i
protected: 9i U/[d
//{{AFX_MSG(CAboutDlg) hP8w3gl_
//}}AFX_MSG cHt4L]n8n
DECLARE_MESSAGE_MAP() (u^8=#
}; g4=C]\1
Q>\Ho'
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pj<aMh
{ 6/#+#T
//{{AFX_DATA_INIT(CAboutDlg) c0Bqm
//}}AFX_DATA_INIT VH4wsEH]
} VXiU5n^
SHs [te[
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %19~9Tw
{ %f'=9pit
CDialog::DoDataExchange(pDX); Xq
)7Im}?
//{{AFX_DATA_MAP(CAboutDlg) unc6 V%
//}}AFX_DATA_MAP q6N{N>-D
} ?FNgJx*\S
Vpp$yM&?
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) X $V_
//{{AFX_MSG_MAP(CAboutDlg) S !#5
// No message handlers rHjDf[5+
//}}AFX_MSG_MAP .?rs5[th*
END_MESSAGE_MAP() fPHV]8Ft|
\9@}0}%`
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w>\oz
: CDialog(CCaptureDlg::IDD, pParent) 2+I5VPf
{ k~so+k&=b
//{{AFX_DATA_INIT(CCaptureDlg) jJw
m_bControl = FALSE; 34X]b[^
m_bAlt = FALSE; ;zze.kb&F
m_bShift = FALSE; 2q]ZI
m_Path = _T("c:\\"); 50dN~(;p
m_Number = _T("0 picture captured."); )b (+=
nCount=0; 4W|cIcU
W
bRegistered=FALSE; PYC
bTray=FALSE; A4|7^Ay
//}}AFX_DATA_INIT "!(@MfjT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 lAA-#YG
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); q+4dHS)x
} \a7m!v
IJKdVb~
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n:B){'S
{ A W6B[
CDialog::DoDataExchange(pDX); "=K3sk
//{{AFX_DATA_MAP(CCaptureDlg) 3 ^x&G?)
DDX_Control(pDX, IDC_KEY, m_Key); U+#^>}wc
DDX_Check(pDX, IDC_CONTROL, m_bControl); f+ZOE?"
DDX_Check(pDX, IDC_ALT, m_bAlt); }5 n\us
DDX_Check(pDX, IDC_SHIFT, m_bShift); 'hPW#*#W<
DDX_Text(pDX, IDC_PATH, m_Path); Dq%}({+
DDX_Text(pDX, IDC_NUMBER, m_Number); @`+\vmfD
//}}AFX_DATA_MAP Tc!n@!RA|
} 4YI6&
M:(.aEe
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @YRy)+
//{{AFX_MSG_MAP(CCaptureDlg) KPDJ$,:
ON_WM_SYSCOMMAND() {`k&Q +gY
ON_WM_PAINT() F'>yBDm*OM
ON_WM_QUERYDRAGICON() Nt]nwae>A
ON_BN_CLICKED(ID_ABOUT, OnAbout) hrD2-S
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;nL7Hizo,
ON_BN_CLICKED(ID_CHANGE, OnChange) $<XQv $YS
//}}AFX_MSG_MAP nu:l;+,VY
END_MESSAGE_MAP() _-H,S)kI`
\!jz1`]&{
BOOL CCaptureDlg::OnInitDialog() -hfkF+=U'
{ R\X;`ptT
CDialog::OnInitDialog(); >);M\,1\I
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1c@S[y
ASSERT(IDM_ABOUTBOX < 0xF000); `Ix`/k}
CMenu* pSysMenu = GetSystemMenu(FALSE); (e~9T MY
if (pSysMenu != NULL) +~YoP>
{ ^b~ZOg[p
CString strAboutMenu; k<j]b^jbz
strAboutMenu.LoadString(IDS_ABOUTBOX); :-U&_%#w
if (!strAboutMenu.IsEmpty()) #@w/S:KbJt
{ A' uaR?
pSysMenu->AppendMenu(MF_SEPARATOR); ReD]M@;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "[k>pzl6
} vol (%wB
} -DJ,<f*$
SetIcon(m_hIcon, TRUE); // Set big icon nj00g>:>
SetIcon(m_hIcon, FALSE); // Set small icon tUZfQ
m_Key.SetCurSel(0); kI04<!
RegisterHotkey(); Het>G{
CMenu* pMenu=GetSystemMenu(FALSE); 6Y6t.j0vN.
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y1>OhHuN
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =Ez@kTvOs
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >ySO.S
return TRUE; // return TRUE unless you set the focus to a control ^V9|uHOJoq
} GutiqVP:B
[-"ZuUG
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |;(P+Q4lB
{ *kZH~]
if ((nID & 0xFFF0) == IDM_ABOUTBOX) B 5qy4MFWs
{ uit.r^8l
CAboutDlg dlgAbout; ;XyryCo
dlgAbout.DoModal(); :/6aBM?
} 8 l= EL7
else hyJ&~i0P{J
{ =
=Q*|L-g
CDialog::OnSysCommand(nID, lParam); o(> #}[N}
} 5]CaWFSmT
} ki2`gLK
MQcIH2
void CCaptureDlg::OnPaint() Khv}q.)F
{ )h>dD
if (IsIconic()) FYu30
{ @].!}tz
CPaintDC dc(this); // device context for painting @p/"]zf
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b{ A/M#=
// Center icon in client rectangle "X!1^)W-8
int cxIcon = GetSystemMetrics(SM_CXICON); Sfc,F8$&N
int cyIcon = GetSystemMetrics(SM_CYICON); _I3"35a
CRect rect; y=+OC1k\8
GetClientRect(&rect); nQ|($V1?W
int x = (rect.Width() - cxIcon + 1) / 2; m~W[,7NE0&
int y = (rect.Height() - cyIcon + 1) / 2; #u+qV!4
// Draw the icon }M"])B I
dc.DrawIcon(x, y, m_hIcon); t5i58@{~
} tQxxm=>
else @}waZ?'
{ VK,{Mu=.9
CDialog::OnPaint(); ez%:>r4
} n"}*C|(k
} c68y\
|/ 8!PKm
HCURSOR CCaptureDlg::OnQueryDragIcon() 8yDsl
{ lfd-!(tXD
return (HCURSOR) m_hIcon; _akjgwu
} u0)9IZxc
YwZx{%f
void CCaptureDlg::OnCancel() Tj!\SbnA[
{ {(asy}a9K
if(bTray) eTw9c }[
DeleteIcon(); 3QVUWhJ
CDialog::OnCancel(); V!yBH<X
} lt]&o0>
CK|AXz+EN
void CCaptureDlg::OnAbout() m J$[X
{ kz("LI]
CAboutDlg dlg; 9AQ,@xP|
dlg.DoModal(); +R;LHRS%
} x;} 25A|
o
/1+
}f
void CCaptureDlg::OnBrowse() =b1
y*?
{ nUX3a'R
CString str; ci:|x =
BROWSEINFO bi; L\bcR
char name[MAX_PATH]; m]Qs
BK
ZeroMemory(&bi,sizeof(BROWSEINFO)); T$<'ZC
bi.hwndOwner=GetSafeHwnd(); ]BRwJ2< x
bi.pszDisplayName=name; QuI!`/N)z
bi.lpszTitle="Select folder"; |f1^&97=+
bi.ulFlags=BIF_RETURNONLYFSDIRS; c(b`eUOO
LPITEMIDLIST idl=SHBrowseForFolder(&bi); >o&%via}
if(idl==NULL) M$>Nd6,@N
return; q|s:&&Wf
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '"LaaTTs
str.ReleaseBuffer(); O7.eq524
m_Path=str; {x..>
4
if(str.GetAt(str.GetLength()-1)!='\\') hBaG*J{
m_Path+="\\"; E[zq<&P@
UpdateData(FALSE); w~pe?j_F$
} <HS{A$]
JX&%5sn(
void CCaptureDlg::SaveBmp() ePaC8sd0
{ eOXu^M>:F
CDC dc; ZJhI|wRwD
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 'gD./|Z0
CBitmap bm; H.]<fvP
int Width=GetSystemMetrics(SM_CXSCREEN); ux6)K= ]
int Height=GetSystemMetrics(SM_CYSCREEN); YD9vWk\/
bm.CreateCompatibleBitmap(&dc,Width,Height); "A~D(1K
CDC tdc; QG
L~??
tdc.CreateCompatibleDC(&dc); 5
I#-h<SG
CBitmap*pOld=tdc.SelectObject(&bm); 'Ce?!UO
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k$#1T +(G
tdc.SelectObject(pOld); ~d,$nZ"z
BITMAP btm; >Lo'H}[pF
bm.GetBitmap(&btm); "fSaM&@[B
DWORD size=btm.bmWidthBytes*btm.bmHeight; IkA~+6UY
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); d>#X+;-k
BITMAPINFOHEADER bih; s,/C^E
bih.biBitCount=btm.bmBitsPixel; Yb[)ETf^
bih.biClrImportant=0; a~JZc<ze
bih.biClrUsed=0; 83# <Yxk~
bih.biCompression=0; s9+lC!!
bih.biHeight=btm.bmHeight; 9o P
bih.biPlanes=1; };Df ><
bih.biSize=sizeof(BITMAPINFOHEADER); n<b}6L}
bih.biSizeImage=size; /S^>06{-+
bih.biWidth=btm.bmWidth; OH]45bd
&7
bih.biXPelsPerMeter=0; ~-%z:Re'_
bih.biYPelsPerMeter=0; zJUT<%[U
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BV/ ^S.~
static int filecount=0; }&s |~
CString name; @ IDY7x27
name.Format("pict%04d.bmp",filecount++); gF293Ez
name=m_Path+name; b{x/V 9&|
BITMAPFILEHEADER bfh; "Z&_*F.[O
bfh.bfReserved1=bfh.bfReserved2=0; B !rb*"[
bfh.bfType=((WORD)('M'<< 8)|'B'); Wap\J7NY
bfh.bfSize=54+size; k{|>!(Ax
bfh.bfOffBits=54; M9~'dS'XI
CFile bf; 3Y +;8ld
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ JL u$UR4
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); n3eWqwQ$5
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5*90t{#
bf.WriteHuge(lpData,size); LRS,bl3}/
bf.Close();
y0) mBCX
nCount++; .]<gm9l
} XC}2GHO<
GlobalFreePtr(lpData); !kh: zTP
if(nCount==1) WigTNg4
m_Number.Format("%d picture captured.",nCount); ]S@DVXH
else !g|[A7<|
m_Number.Format("%d pictures captured.",nCount); ku>Bxau4>
UpdateData(FALSE); ExL7 ]3r
} ).Iifu|ks
am| 81)|a
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) KxFA@3
{ W%9~'pXgB
if(pMsg -> message == WM_KEYDOWN) LCH w.
{ (58r9WhS
if(pMsg -> wParam == VK_ESCAPE) {D,-
Whi
return TRUE; q"f7$
if(pMsg -> wParam == VK_RETURN) #0^a-47PA<
return TRUE; ox";%|PP1
} W55kR.X6M
return CDialog::PreTranslateMessage(pMsg); N>sHT
=_
} w-@6qMJ
91fZr
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4Y
G\<Zf
{ N];K
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `Uvc^
SaveBmp(); 2J3y
1
return FALSE; =4!m]*y
} b`;&o^7gMO
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `bLJwJ7
CMenu pop; <<@F{B7h
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2q9$5
CMenu*pMenu=pop.GetSubMenu(0); y^
st
T^
pMenu->SetDefaultItem(ID_EXITICON); X@A8~kj1
CPoint pt; oXVx9dZ
GetCursorPos(&pt); |a'$v4dCF
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); R"z}q(O:
if(id==ID_EXITICON) ]&='E.f
DeleteIcon(); 7o7FW=^
else if(id==ID_EXIT) E 429<LQI/
OnCancel(); Q5 o0!w
return FALSE; H5jk#^FD
} Tg=P*HY6
LRESULT res= CDialog::WindowProc(message, wParam, lParam); yio8BcXH54
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .^ba*qb`{
AddIcon(); N6*FlG-
return res; 7$R^u7DZ
} _ vAc/_N
(H]NL
void CCaptureDlg::AddIcon() `C^0YGO%
{ UzV78^:,iD
NOTIFYICONDATA data; Jr(Z Ym'
data.cbSize=sizeof(NOTIFYICONDATA); rfh`;G5s
CString tip; j5~~%
tip.LoadString(IDS_ICONTIP); n6c+Okj
data.hIcon=GetIcon(0); \34:]NM
data.hWnd=GetSafeHwnd(); g/w<T+v
strcpy(data.szTip,tip); 8>I4e5Ym
data.uCallbackMessage=IDM_SHELL; gmiLjI
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eK\i={va
data.uID=98; N{a=CaYi+
Shell_NotifyIcon(NIM_ADD,&data); oC3W_vH.%
ShowWindow(SW_HIDE); 'PTQ
S,E
bTray=TRUE; |2jA4C2L}
} !_iv~Q zv
Q>G% *?
void CCaptureDlg::DeleteIcon() 1T4#+kW&
{ ))7CqN
NOTIFYICONDATA data; S++jwP
data.cbSize=sizeof(NOTIFYICONDATA); ' XOWSx;Y
data.hWnd=GetSafeHwnd(); Y44[2 :m
data.uID=98; 'W&ewZH_h
Shell_NotifyIcon(NIM_DELETE,&data); J7kqyo"
ShowWindow(SW_SHOW); pMf
?'l
SetForegroundWindow(); 7oCY@>(f
ShowWindow(SW_SHOWNORMAL); p y%:,hi
bTray=FALSE; Y7')~C`up^
} Fgi;%
~L_1&q^4!i
void CCaptureDlg::OnChange() Vf$$e)
{ "=2'O qp1
RegisterHotkey(); /.t1Ow
} UhU"[^YO
wxF\enDY
BOOL CCaptureDlg::RegisterHotkey() jK{qw
{ ]na$n[T/I
UpdateData(); K d{o/R
UCHAR mask=0; gz Dfx&.0
UCHAR key=0; zS`KJVm
if(m_bControl) L=I;0Ip9y
mask|=4; g$JlpD&
if(m_bAlt) DjvPeX
mask|=2; qsYg%Z
if(m_bShift) \
# la8,+9
mask|=1; ZsP>CELm@
key=Key_Table[m_Key.GetCurSel()]; G4\|bwh
if(bRegistered){ 8\+DSA
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Z4sS;k]}
bRegistered=FALSE; ~,x4cOdR#
} l.BiE<&
cMask=mask; 2g5jGe*0
cKey=key; $gCN[%+j
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qCF&o7*oN
return bRegistered; ^W~8)Rbf
} mp*?GeV?M
s#Xfu\CP
四、小结 D&OskM60
Zlrbd
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。