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:
kgr:85
)6bxP&k 一、实现方法
4 3]6J]!) &U4]hawbOU 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:
]DmqhK` xBgf)'W_Z #pragma data_seg("shareddata")
y^;qT_)# HHOOK hHook =NULL; //钩子句柄
A'[A!NL% UINT nHookCount =0; //挂接的程序数目
:vurU$\ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
^3=8*Xr static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
;2L=WR% static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
ngeX+@ static int KeyCount =0;
EF"ar static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
T?AGQcG #pragma data_seg()
.8b4 P2`ks[u+i 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。
;lYO)Z`3\ Mh~T.;f.qq 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:
V9Au\ MYN1zYT6j BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
8^dGI9N
cKey,UCHAR cMask)
L'aMXNO {
$ZcmE<7k BOOL bAdded=FALSE;
aj(M{gFq~ for(int index=0;index<MAX_KEY;index++){
)&_{m
K if(hCallWnd[index]==0){
zE<vFP-1v hCallWnd[index]=hWnd;
CvbY2_>Nh HotKey[index]=cKey;
ec=4L@V* HotKeyMask[index]=cMask;
{E 6W]Mno bAdded=TRUE;
?ZDx9*f KeyCount++;
Qbv)(&i#~ break;
Z
NCq/ }
zN2sipJS8 }
)B}]0`z:P return bAdded;
1+y&n? }
\F1nEj //删除热键
,ypxy/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ulj`+D?H {
rBr28_i BOOL bRemoved=FALSE;
Y Nq<%i!> for(int index=0;index<MAX_KEY;index++){
&v 5yo}s if(hCallWnd[index]==hWnd){
y:2o-SJn if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q8kt_&Ij hCallWnd[index]=NULL;
"hy#L
0\t HotKey[index]=0;
"H G:by HotKeyMask[index]=0;
e}K;5o=I bRemoved=TRUE;
P]6pPS KeyCount--;
c$e~O-OVD? break;
=WO{h48] }
xHD!8B) }
.zegG=q }
\2NiI]t] return bRemoved;
E"L'm0i[[ }
:-6_X< D(h|r^5 2B!nLLCp+ DLL中的钩子函数如下:
>`oO(d}n[0 w~Y#[GW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^'[ | {
Q7}wY BOOL bProcessed=FALSE;
VJ=!0v if(HC_ACTION==nCode)
I gFz[)
{
9R ugkGy if((lParam&0xc0000000)==0xc0000000){// 有键松开
Z>M*!mQi switch(wParam)
q5HHMHB {
OmoY] 8N} case VK_MENU:
Q'A->I<;_s MaskBits&=~ALTBIT;
(1Kh9w:^" break;
M2oKLRt)L case VK_CONTROL:
c!841~p(Q MaskBits&=~CTRLBIT;
/,:32H break;
{?m',sG;& case VK_SHIFT:
wkIH<w|jb MaskBits&=~SHIFTBIT;
hOwVm;: break;
el[6E0!@ default: //judge the key and send message
f3596a break;
a\%g_Q){ }
0e}LZ,9e for(int index=0;index<MAX_KEY;index++){
kXOlZC if(hCallWnd[index]==NULL)
SQz>e continue;
]I}'
[D if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L3kms6ch {
[e*8hbS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
5,mb]v0k bProcessed=TRUE;
(TY^
ky Sr }
W0nRUAo[ }
BRW
}
QTLOP~^ else if((lParam&0xc000ffff)==1){ //有键按下
= j}00,WH switch(wParam)
Ur@'X- {
FD`V39## case VK_MENU:
IzL
yn MaskBits|=ALTBIT;
TnKe"TA|9 break;
Zd5frc$ case VK_CONTROL:
|H
|ewVUY MaskBits|=CTRLBIT;
Zd~Z`B} & break;
k*n5+[U^tP case VK_SHIFT:
=XWi+') MaskBits|=SHIFTBIT;
=nY*,Xu< break;
@0)bY*njj default: //judge the key and send message
2smLv1w@ break;
: 0%V:B }
( E0be. for(int index=0;index<MAX_KEY;index++){
k@wxN!w; if(hCallWnd[index]==NULL)
zb9$ continue;
7%?A0%>6G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yt<K!=7& {
^ 5UIbA( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Qb SX'mx< bProcessed=TRUE;
c5t?S@b }
"0]i4d1l }
V=
.'Db2D }
W{0<ro` if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
D vK}UAj= for(int index=0;index<MAX_KEY;index++){
nNL9B~d if(hCallWnd[index]==NULL)
WJg?R^ continue;
QU\|RX if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
,Z52dggD SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
py,z7_Nuh //lParam的意义可看MSDN中WM_KEYDOWN部分
evn ]n }
5X[=Q> }
WO
'33Q( }
~s88JLw%&u return CallNextHookEx( hHook, nCode, wParam, lParam );
H(""So7L }
.=K@M"5& G8<,\mg+ 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:
Z$+0gm\Cnw Bh@j6fv BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N]5-# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
!rwv~9I //AS44^IS 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:
#5'9T:8 sYp@.?Tz LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
ya|7hz { {
e&wWlB![ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
v_oNM5w {
#Ok*Or //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*xt3mv/<z SaveBmp();
OHH wcJ 7N return FALSE;
-,p(PK }
\]o#tYN\a0 …… //其它处理及默认处理
\f%jN1z }
~I!7]i]"*? nKV1F0- N|8TE7- F| 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*,5t81 $%sOL(
r 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。
4GaF:/ p+A#t~K 二、编程步骤
$7lI Dt Nno*X9>~ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
)Ibp%'H EAx@a% 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
rbs:qLa% ,qt9S0QS 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Cg-khRgLS friNo^v& 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
>Ei_## `2UzJ~ 5、 添加代码,编译运行程序。
@R>J\> a B%DIH, 三、程序代码
Ean@GDLz8 :X/j%m* ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
1_*o(HR #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
IU/dY`J1 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
;aWH`^{i #if _MSC_VER > 1000
Xb3z<r
#pragma once
Wu9@Ecb #endif // _MSC_VER > 1000
XkOsnI8n #ifndef __AFXWIN_H__
k)dLJ<EM #error include 'stdafx.h' before including this file for PCH
8
<EE4y #endif
~[ isR|> #include "resource.h" // main symbols
kC0F@'D class CHookApp : public CWinApp
)"wWV{k {
-+ -@Yq$ public:
^6oz3+ CHookApp();
"{j4?3f) // Overrides
$#8dtF // ClassWizard generated virtual function overrides
.[NB"\<q //{{AFX_VIRTUAL(CHookApp)
&8z`]mB{t public:
6Jrh'6o@ virtual BOOL InitInstance();
!z$.Jcr1 virtual int ExitInstance();
5fA<I _ D //}}AFX_VIRTUAL
h /@G[5E //{{AFX_MSG(CHookApp)
zT*EpIa+LS // NOTE - the ClassWizard will add and remove member functions here.
vc5g4ud // DO NOT EDIT what you see in these blocks of generated code !
:WJ[a# //}}AFX_MSG
VW$ Hzx_z DECLARE_MESSAGE_MAP()
+r"{$'{^ };
6/Q'o5>NL: LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
6ix8P;;}# BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
^ ,d!K2` BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
w:#yu BOOL InitHotkey();
5_x8!v BOOL UnInit();
6`+dP"@ #endif
a4Fe MCvV9 S{7A3
x'B //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
k$j>_U? P #include "stdafx.h"
6DD"Asi+ #include "hook.h"
tQ&.;{5[f #include <windowsx.h>
LaG./+IP #ifdef _DEBUG
pMe'fC~* #define new DEBUG_NEW
JJPU! #undef THIS_FILE
~q5" ' static char THIS_FILE[] = __FILE__;
#ih(I7prH #endif
T'"aStt6 #define MAX_KEY 100
Np$pz #define CTRLBIT 0x04
d@<(Z7| #define ALTBIT 0x02
3Gubq4r #define SHIFTBIT 0x01
T;IaVMFG|d #pragma data_seg("shareddata")
q~48lxDU HHOOK hHook =NULL;
q]ER_]%Gna UINT nHookCount =0;
2Xys;Dwx static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
D .oX>L#: static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
^y]CHr static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
o['HiX static int KeyCount =0;
aqSHo2]DX9 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
^OnU;8IC #pragma data_seg()
3&^4%S{/ HINSTANCE hins;
0,1:l3iu1M void VerifyWindow();
N.vt5WP BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
M,7A|?O //{{AFX_MSG_MAP(CHookApp)
0&mOu #l // NOTE - the ClassWizard will add and remove mapping macros here.
E LZCrh6* // DO NOT EDIT what you see in these blocks of generated code!
3Un
q
9 //}}AFX_MSG_MAP
n,q+EZd END_MESSAGE_MAP()
}1VxMx@ ]d=SkOq CHookApp::CHookApp()
L<'3O),} {
dbQUW#<Q // TODO: add construction code here,
BT.;l I // Place all significant initialization in InitInstance
\09eH[ }
_~ZNX+4 /7/d
u[P6 CHookApp theApp;
OXd617
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
B2w\ {
-!f)P=S BOOL bProcessed=FALSE;
"l &=a1l if(HC_ACTION==nCode)
D~E1hr&Vd> {
`z=U-v'H)D if((lParam&0xc0000000)==0xc0000000){// Key up
h,o/(GNnW switch(wParam)
$O9Nprf {
EnnT)qos case VK_MENU:
YBqu7& MaskBits&=~ALTBIT;
uLX5khQ break;
T[]2]K[&B case VK_CONTROL:
e33 j&:O MaskBits&=~CTRLBIT;
>qk[/\^O break;
#Mkwd5S|L case VK_SHIFT:
,:Qy%k}f MaskBits&=~SHIFTBIT;
h
U\)CM break;
{>PN}fk2QP default: //judge the key and send message
ofH=h break;
^m8T$^z> }
Dvbrpn!sk for(int index=0;index<MAX_KEY;index++){
&7"a.&*9xX if(hCallWnd[index]==NULL)
/T1zz2l~ continue;
yV[9 ( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
AV{3f` {
7N9~nEU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#-*7<wN bProcessed=TRUE;
[!H2i
p- }
o!!";q%DX }
*5?a%p }
t\Pn67t else if((lParam&0xc000ffff)==1){ //Key down
nm5zX, switch(wParam)
VO r*YB& {
|U)m'W-(q case VK_MENU:
G347&F) MaskBits|=ALTBIT;
=
}0M^F break;
{5w'.Z]0v case VK_CONTROL:
(WZKqt)S"o MaskBits|=CTRLBIT;
G8b/eWtP break;
A[)od case VK_SHIFT:
/J!C2 MaskBits|=SHIFTBIT;
IA_>x9 (~ break;
6$c,#%Jt* default: //judge the key and send message
7ADh break;
aV"K%#N }
^PA[fL" for(int index=0;index<MAX_KEY;index++)
o>*vG {
Elth xj if(hCallWnd[index]==NULL)
9 f$S4O5 continue;
8fA9yQ8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oE@{h$= {
DY1?37h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
v0hr ~1 bProcessed=TRUE;
/^ *GoB }
^T*^L=L_( }
#vh1QV!Ho }
Dlz||== if(!bProcessed){
dayp1%d for(int index=0;index<MAX_KEY;index++){
6QS[mWU if(hCallWnd[index]==NULL)
!9|)v7} continue;
$Gt1T[:QUX if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
D>"U0*h SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
*I,3,zO }
`~|8eKFq! }
pgT XyAP{ }
U7O]g'BP return CallNextHookEx( hHook, nCode, wParam, lParam );
GtI]6t }
j$r .&,m B198_T! BOOL InitHotkey()
ER,,K._?B {
+W|MAJtg if(hHook!=NULL){
KY'"Mg^! nHookCount++;
/LMb~Hy, return TRUE;
k<W n }
0=Jf93D5 else
2_Me
4 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
^ei[#I if(hHook!=NULL)
$__e7 nHookCount++;
qZRx,^gd return (hHook!=NULL);
04-phEA2Q }
uV1H iv- BOOL UnInit()
bDd$79@m {
[P#^nyOh( if(nHookCount>1){
Q)N$h07R nHookCount--;
QYDTb=h~ return TRUE;
:()(P9? }
pcw!e_"+ BOOL unhooked = UnhookWindowsHookEx(hHook);
86d* if(unhooked==TRUE){
JHpoW}7QB nHookCount=0;
pL` snVz hHook=NULL;
48,Aq*JFw }
~:7AHK2 return unhooked;
PRmZ3 }
=uKGh`^[ _i [.5 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pAg;Rib
{
G#V5E)Dx BOOL bAdded=FALSE;
w`XwW#!}@$ for(int index=0;index<MAX_KEY;index++){
Yo0%5 noz if(hCallWnd[index]==0){
7Cf%v`B4D hCallWnd[index]=hWnd;
FI@2KM HotKey[index]=cKey;
^9T6Ix{= HotKeyMask[index]=cMask;
EFeG[bxM bAdded=TRUE;
n=v4m_e KeyCount++;
-x
)(2| break;
pGw|T~e% }
{#M=gDhbX }
u:H@]z(x return bAdded;
]RHR> =; }
PHRc*G{ X'N4a BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<LM<, {
iqf+rBL BOOL bRemoved=FALSE;
N>i1TM2 for(int index=0;index<MAX_KEY;index++){
Y{y #us1 if(hCallWnd[index]==hWnd){
^EU&6M2 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
'R6D+Vk/ hCallWnd[index]=NULL;
Bv"Fx*{W HotKey[index]=0;
WH :+HNl1d HotKeyMask[index]=0;
L;.6j*E* bRemoved=TRUE;
X70 vDoW KeyCount--;
~h -G break;
=0xuH>WY}w }
b!hxx Z }
Y1AbG1n| }
EK.L>3 return bRemoved;
}]sI?&xB }
><iE VrpN UNocm0!N' void VerifyWindow()
@%J?[PG {
G\h8j*o
for(int i=0;i<MAX_KEY;i++){
QQ@, v@j5 if(hCallWnd
!=NULL){ G}i\UXFE
if(!IsWindow(hCallWnd)){ ,
6\i
hCallWnd=NULL; >VP\@xt(R[
HotKey=0; 1DcYc-k#
HotKeyMask=0; Y>!9P\Xe
KeyCount--; #m
3WZ3t$
} "d'xT/l
"
} yZI4%fen
} sBp|Lo
} FsZM_0>/s
4s*P5w_'/
BOOL CHookApp::InitInstance() Mr:*l`b_
{ lj%8(X u
AFX_MANAGE_STATE(AfxGetStaticModuleState()); `(aU_r=
hins=AfxGetInstanceHandle(); 4,f[D9|:
InitHotkey(); E=gD{1,?
return CWinApp::InitInstance(); [$?S9)Xd
} Kbx (^f12
Q3%a=ba)h
int CHookApp::ExitInstance() G/(oQA
{ fT._Os?i
VerifyWindow(); ,IuO;UV#)
UnInit(); YkPz ~;
return CWinApp::ExitInstance(); Y'/` ?CK
} .^#{rk
'N=' B<^;%
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hX)r%v:
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =pWpHbB.
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FVG|5'V^
#if _MSC_VER > 1000 3leg,qd
#pragma once O|,+@qtH
#endif // _MSC_VER > 1000 Fhn883
?>q=Nf^ Q.
class CCaptureDlg : public CDialog =Cs$0aA
{ pvy;L[c
// Construction [gzU/:
public: UE7P =B
BOOL bTray; D]y6*Ha
BOOL bRegistered; }3:TPW5S
BOOL RegisterHotkey(); @babgP,
UCHAR cKey; 9 )B >|#\
UCHAR cMask; V2w[0^L
void DeleteIcon(); {z@vSQ=)=P
void AddIcon(); G+[>or}
UINT nCount; aC3\Hs
void SaveBmp(); avO+1<`4B
CCaptureDlg(CWnd* pParent = NULL); // standard constructor voQ, K9
// Dialog Data oBqP^uT>a|
//{{AFX_DATA(CCaptureDlg) Fh v)
enum { IDD = IDD_CAPTURE_DIALOG }; :;0?;dpO
CComboBox m_Key; d;lp^K
M
BOOL m_bControl; MBcOIy[&A
BOOL m_bAlt; XP2=x_"y
BOOL m_bShift; 2!68W
X
CString m_Path; +6<MK;
CString m_Number; LDV{#5J
//}}AFX_DATA Zpb3>0<R
// ClassWizard generated virtual function overrides m)_1->K
//{{AFX_VIRTUAL(CCaptureDlg) /UyW&]nK
public: w0/W=!_
virtual BOOL PreTranslateMessage(MSG* pMsg); "G6d'xkP
protected: idO3/>R
[
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G&C)`};
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?2EzNN cS
//}}AFX_VIRTUAL vW$]:).
// Implementation jn}6yXB
protected: }r^MXv ~(
HICON m_hIcon; I]SR.Yp%
// Generated message map functions ,eUMSg~P.7
//{{AFX_MSG(CCaptureDlg) vo71T<K
virtual BOOL OnInitDialog(); fil6w</L
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 73}k[e7e
afx_msg void OnPaint(); /Z2*>7HM8[
afx_msg HCURSOR OnQueryDragIcon(); )STt3.
virtual void OnCancel(); _%zU^aE
afx_msg void OnAbout(); W]Ph:O^5c
afx_msg void OnBrowse(); PYz| d
afx_msg void OnChange(); 't)j
//}}AFX_MSG fE7WLV2I>
DECLARE_MESSAGE_MAP() 8-?n<h%8E
}; dJ24J+9}]j
#endif ixKQh};5/
kIWQ`)'
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gP1$#KgU
#include "stdafx.h" svo^#V~h'
#include "Capture.h" ;prp6(c
#include "CaptureDlg.h" `}Q;2 F
#include <windowsx.h> 5,Q('t#J
#pragma comment(lib,"hook.lib") 8#Z$}?W
#ifdef _DEBUG RuRJ jcnY
#define new DEBUG_NEW gu:..'V
#undef THIS_FILE ;'o>6I7Ph
static char THIS_FILE[] = __FILE__; 3"L$*toRA
#endif Be]o2N;J
#define IDM_SHELL WM_USER+1 GtGToI
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :cC`wX$
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {Z?!*Ow
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; z0Zl'
class CAboutDlg : public CDialog ^Ws~h\{%
{ um8ZhXq
public: J7cqn j
CAboutDlg(); D3^v[>E2
// Dialog Data T >-F~?7Sv
//{{AFX_DATA(CAboutDlg) ` j Un
enum { IDD = IDD_ABOUTBOX }; >LLz G
//}}AFX_DATA \pPq]k
// ClassWizard generated virtual function overrides T2(+HI2
//{{AFX_VIRTUAL(CAboutDlg) ]iNSa{G
protected: v#/,,)m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R,^FJ
//}}AFX_VIRTUAL ,*lK4?v
// Implementation %xk]y&jv
protected: M]_vb,=1
//{{AFX_MSG(CAboutDlg) \Fj4Gy?MW
//}}AFX_MSG [FCNW0NV
DECLARE_MESSAGE_MAP() =G72`]#-
}; cxv)LOl-
Hd2_Cg FB
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) s~63JDy"E
{ 9a4RW}S<
//{{AFX_DATA_INIT(CAboutDlg) ;zJ_apZ:{
//}}AFX_DATA_INIT %vThbP#mR|
} <'vM+Lk
\Fe5<G'v
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zO\"$8q*
{ X0P$r6 ;
CDialog::DoDataExchange(pDX); 0y ;gi3W
//{{AFX_DATA_MAP(CAboutDlg) c`jTdVD
//}}AFX_DATA_MAP :8QG$Ua1
} H{ $ yy)@F
"1nd~
BBOw
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j68Gz5;j
//{{AFX_MSG_MAP(CAboutDlg) hs*:!&E
// No message handlers {Y/
//}}AFX_MSG_MAP D@ lJ^+
END_MESSAGE_MAP() ){(cRB $
Ud9\;Qse
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]E3g8?L
: CDialog(CCaptureDlg::IDD, pParent) W ][IHy<
{ p,0 \NUC
//{{AFX_DATA_INIT(CCaptureDlg) 7yj2we
m_bControl = FALSE; @6tx5D?
m_bAlt = FALSE; JH5])i0
m_bShift = FALSE; 6x7=0}'
m_Path = _T("c:\\"); u}h'v&"e,
m_Number = _T("0 picture captured."); x-QP+M`Pu
nCount=0; W>Kwl*Cis"
bRegistered=FALSE;
*>#cs#)
bTray=FALSE; tsa6: D
//}}AFX_DATA_INIT |% kK?!e+-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @kK=|(OB'
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); s1FBz)yCY=
} D|BN_ai9
/>oU}m"k
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) axl?t|~I
{ +Q9HsfX/
CDialog::DoDataExchange(pDX);
2U+&F'&Q
//{{AFX_DATA_MAP(CCaptureDlg) 0jS/U|0
DDX_Control(pDX, IDC_KEY, m_Key); JU6np 4
DDX_Check(pDX, IDC_CONTROL, m_bControl); oe<Y,%u"6
DDX_Check(pDX, IDC_ALT, m_bAlt); hh{liS% 10
DDX_Check(pDX, IDC_SHIFT, m_bShift); d"cfSH;h
DDX_Text(pDX, IDC_PATH, m_Path); (M=Br
DDX_Text(pDX, IDC_NUMBER, m_Number); 4CCux4)N
//}}AFX_DATA_MAP 0k>&MkM\^
} 6]3ZUH;
-,tYfQ;:
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]aR4U`
//{{AFX_MSG_MAP(CCaptureDlg) +Oscy-;
ON_WM_SYSCOMMAND()
1W8W/Y=hT
ON_WM_PAINT() O^:h _L
ON_WM_QUERYDRAGICON() 2=|IOkY
ON_BN_CLICKED(ID_ABOUT, OnAbout) GwV FD%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !<)_ F
ON_BN_CLICKED(ID_CHANGE, OnChange) GwycSb1
//}}AFX_MSG_MAP M}<=~/k`j
END_MESSAGE_MAP() +u2Co_FJ&
izw}25SW
BOOL CCaptureDlg::OnInitDialog() g=(+oK?
{ `iI"rlc
CDialog::OnInitDialog(); nXS%>1o,
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 525 >=h
ASSERT(IDM_ABOUTBOX < 0xF000); ba ?k:b
CMenu* pSysMenu = GetSystemMenu(FALSE); vB{b/xmah
if (pSysMenu != NULL) ?uN(" I
{ )-{~7@yqZ
CString strAboutMenu; a8 1%M
strAboutMenu.LoadString(IDS_ABOUTBOX); .R'i=D`Pz
if (!strAboutMenu.IsEmpty()) #jJcgR<
{ YMd&+J`
pSysMenu->AppendMenu(MF_SEPARATOR); ?Sqm`)\>4
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ["M>
} F~AS(sk
} 7y\g~?5N
SetIcon(m_hIcon, TRUE); // Set big icon a*hThr+$M
SetIcon(m_hIcon, FALSE); // Set small icon X
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m_Key.SetCurSel(0); "=(;l3-o
RegisterHotkey(); {Jc!T:vJ
CMenu* pMenu=GetSystemMenu(FALSE); h~@+M5r,
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (n/1:'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -Tx tX8v
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pYG,5+g
return TRUE; // return TRUE unless you set the focus to a control lo: ~~l
} qrc/Q;$
>B
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3Y-v1.^j
{ E'8Bw7Tz
if ((nID & 0xFFF0) == IDM_ABOUTBOX) m #QI*R
XP
{ F21[r!3
CAboutDlg dlgAbout; Ol[gck|~
dlgAbout.DoModal(); W<VHv"?V
} zIFL?8!H9{
else cloI 6%5r
{ u2]g1XjeG
CDialog::OnSysCommand(nID, lParam); [{F7Pc
} m!60.
} ]gksyxn3
@3 c#\jx
void CCaptureDlg::OnPaint() )uvFta<(
{ 7V
(7JV<>
if (IsIconic()) ZPao*2xz
{ !d.>r
7w
CPaintDC dc(this); // device context for painting 9`xFZMd31A
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r5!M;hU1j
// Center icon in client rectangle `YNC_r#tG
int cxIcon = GetSystemMetrics(SM_CXICON); p0y?GNQ
int cyIcon = GetSystemMetrics(SM_CYICON); :QV6z*#zD
CRect rect; R"gm]SQ/
GetClientRect(&rect); tq[",&K
int x = (rect.Width() - cxIcon + 1) / 2; Ko)T>8:
int y = (rect.Height() - cyIcon + 1) / 2; 5,BkwAr+6[
// Draw the icon -_DiD^UcXn
dc.DrawIcon(x, y, m_hIcon); cGta4;
} So%1RY{)
else *.%)rm
{ j :Jdwf
CDialog::OnPaint(); ptyDv
} ;n{j,HB
} */dh_P<Yj
HcVs(]tIW
HCURSOR CCaptureDlg::OnQueryDragIcon() 9c}]:3#XO
{ RK:sQWG
return (HCURSOR) m_hIcon; _8pkejg
} n3g
WMC
'3UIriY6
void CCaptureDlg::OnCancel() Z?v6pjZ?
{ soQzIx
if(bTray) =tRe3o0(
DeleteIcon(); Y_3YO2K]
CDialog::OnCancel(); 1qKxg
} Qn)[1v
'a/6]%QFd!
void CCaptureDlg::OnAbout() 9hLmrYNM1
{ 5`'au61/2
CAboutDlg dlg; &R FM
d=
dlg.DoModal(); 9
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} \3(|c#c
xiOrk
void CCaptureDlg::OnBrowse() .'{6u;8
{ u:H 3.5)%
CString str; ]#-/i2-K
BROWSEINFO bi; 0/00W6r0
char name[MAX_PATH]; 6dR-HhF
ZeroMemory(&bi,sizeof(BROWSEINFO)); -KJ!
bi.hwndOwner=GetSafeHwnd(); "ko?att~
bi.pszDisplayName=name; ><
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bi.lpszTitle="Select folder"; F;&fx(
bi.ulFlags=BIF_RETURNONLYFSDIRS; $s(4?^GP
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Hs`#{W{.
if(idl==NULL) {p*hN i)0
return; `_g?y)
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ':2*+
str.ReleaseBuffer(); 0m YZ7S5g
m_Path=str; a.`JS
if(str.GetAt(str.GetLength()-1)!='\\') Q~Sv2
m_Path+="\\"; =.f +}y
UpdateData(FALSE); 'oHOFH9:{b
} XG\a-dq[
}!yD^:[5
void CCaptureDlg::SaveBmp() 6=g]Y!o$
{ #9hXZr/8
CDC dc; L3=YlX`UL
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,ORG"]_F
CBitmap bm; q%kj[ZOY$]
int Width=GetSystemMetrics(SM_CXSCREEN); "J[i=~(
int Height=GetSystemMetrics(SM_CYSCREEN); hKzBq*cV
bm.CreateCompatibleBitmap(&dc,Width,Height); pJ$N@ID
CDC tdc; K.iH
tdc.CreateCompatibleDC(&dc); =y-!k)t
CBitmap*pOld=tdc.SelectObject(&bm); B:A1W{l
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ekl?K~
tdc.SelectObject(pOld); o~.o^0Y
BITMAP btm; s?G'l=CcKu
bm.GetBitmap(&btm); C>`.J_N
DWORD size=btm.bmWidthBytes*btm.bmHeight; ;/)Mcx] n
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fBWJ%W
BITMAPINFOHEADER bih; 6PQJgki
bih.biBitCount=btm.bmBitsPixel; X.T\=dm%v
bih.biClrImportant=0; QC\g%MVG
bih.biClrUsed=0; 6Er0o{iI
bih.biCompression=0; ;( Ajf.i
bih.biHeight=btm.bmHeight; .y;\puNq
bih.biPlanes=1; @cS1w'=
bih.biSize=sizeof(BITMAPINFOHEADER); Ot2zhR )
bih.biSizeImage=size; |?fW!y
bih.biWidth=btm.bmWidth; kh>SrW]B%
bih.biXPelsPerMeter=0; GOZQ5m
-
bih.biYPelsPerMeter=0; Oj4u!SY\j
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q0L@.`~
static int filecount=0; h[-d1bKwS
CString name; C$'D]fX
name.Format("pict%04d.bmp",filecount++); _']%qd"%
name=m_Path+name; 8=n9hLhqo
BITMAPFILEHEADER bfh; ~3'OiIw1@
bfh.bfReserved1=bfh.bfReserved2=0; StdS$XW
bfh.bfType=((WORD)('M'<< 8)|'B'); rt 3f7 s*
bfh.bfSize=54+size; |Uy e>%*}4
bfh.bfOffBits=54; ySixYt
CFile bf; dK J@{d
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {XDY:`vZ}
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~<2 IIR$H
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v ]/OAH6D
bf.WriteHuge(lpData,size); *gM,x4 Y
bf.Close(); m{bZRkt
nCount++; s.R-<Y3
} |b$>68:
GlobalFreePtr(lpData); kvW|=
if(nCount==1) wQD0vsD
m_Number.Format("%d picture captured.",nCount); ;0w ^ud
else E(QZ!'%K+m
m_Number.Format("%d pictures captured.",nCount); M('s|>\l
UpdateData(FALSE); 5|<yfk8*J
} {)
:%WnM9
YGq=8p7.R
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kf%&d}2to
{ }J ei$0x
if(pMsg -> message == WM_KEYDOWN) &=F-moDD
{ ]^J+-c
if(pMsg -> wParam == VK_ESCAPE) [x2JFS#4
return TRUE; oUJj5iu}
if(pMsg -> wParam == VK_RETURN) lZ|L2Yg3uB
return TRUE; w/b>awI
} C5O5S:|'
return CDialog::PreTranslateMessage(pMsg); DA<F{n.Z:
}
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CS/Mpmsp
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qP~WEcH`[
{ Ds%9cp*6
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [[:UhrH-
SaveBmp(); +h0PR?
return FALSE; E,{GU
} L'zE<3O'3
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v,/[&ASz
CMenu pop; V]79vC
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); D
Irgq|8
CMenu*pMenu=pop.GetSubMenu(0); BjJ,"sT
pMenu->SetDefaultItem(ID_EXITICON); /b{o3, #.M
CPoint pt; 8zhBA9Y#~
GetCursorPos(&pt); =43I1&_
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >[ eW">:>K
if(id==ID_EXITICON) kOw=c Gt
DeleteIcon(); ;Vg^!]LL#
else if(id==ID_EXIT) 6cJ<9i
&
OnCancel(); rwiw
Rh
return FALSE; 7ftR4
} ,4[dLWU
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 4&Byl85q
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !c%
AddIcon(); t/}L36@+
return res; 'It?wB W
} )2xE z
{fZb@7?GF
void CCaptureDlg::AddIcon() geksjVwPH
{ ^YGTh0$W
NOTIFYICONDATA data; P?kx
data.cbSize=sizeof(NOTIFYICONDATA); RctU' T
CString tip; |,b2b2v?
tip.LoadString(IDS_ICONTIP); zj<ahg%z
data.hIcon=GetIcon(0); MDJc[am
data.hWnd=GetSafeHwnd(); (8.{+8o
strcpy(data.szTip,tip); j~bAbOX12
data.uCallbackMessage=IDM_SHELL; iOX Z]Xj5
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; L>dkrr)e
data.uID=98; 74+A+SK[
Shell_NotifyIcon(NIM_ADD,&data); dL-i)F
ShowWindow(SW_HIDE); 5F2_xH$5
bTray=TRUE; U&X2cR &a
} t8QRi!\=
F|>05>8
void CCaptureDlg::DeleteIcon() |( G2K'Ab
{ vA=Z=8
NOTIFYICONDATA data; yGxv?%%2
data.cbSize=sizeof(NOTIFYICONDATA); (&jW}1D
data.hWnd=GetSafeHwnd(); yub{8 f;v
data.uID=98; v5_7r%Hiw
Shell_NotifyIcon(NIM_DELETE,&data); 8nCp\0
ShowWindow(SW_SHOW); )0^># k
SetForegroundWindow(); i31<].|kA*
ShowWindow(SW_SHOWNORMAL); `H>b5
bTray=FALSE; =!BobC- [b
} afHaB/t{R
ks*Y9D*=
void CCaptureDlg::OnChange() q*,Q5
{ u)a'
RegisterHotkey(); ,>n%
~'gb
} 5Fmav5
8TE>IPjm
BOOL CCaptureDlg::RegisterHotkey() {CtR+4KD
{ d|XmasGN
UpdateData(); "xe=N
UCHAR mask=0; MoD?2J
UCHAR key=0; +L0w;w T
if(m_bControl) zvY+R\,in
mask|=4; MuwQZ]u
if(m_bAlt) Ha%F"V*
mask|=2; 2?W7I/F
if(m_bShift) }u%"$[I}
mask|=1; Gh}yb-$N`&
key=Key_Table[m_Key.GetCurSel()]; ](#&.q%5!
if(bRegistered){ j(eFoZz,
DeleteHotkey(GetSafeHwnd(),cKey,cMask); P`S@n/}
bRegistered=FALSE; +f>c xA
} ]5'
d&f
cMask=mask; ye%iDdf
cKey=key; _OMpIdY,R*
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); N2ied^* 0
return bRegistered; MV0Lq:# N
} +pf5\#l?
6?qDdVR~]
四、小结
#DFV=:|~
<@G8ni
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。