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:
SZUhZIz&
)m8ve)l 一、实现方法
[3$L}m H CBZ*Z- 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
FHztF$Z "ijpqI #pragma data_seg("shareddata")
1D2Uomd( HHOOK hHook =NULL; //钩子句柄
$;O-1# ] UINT nHookCount =0; //挂接的程序数目
#h,7dz.d static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
eAqSY s!1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
E}Ir<\ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
X;2I'
Kg static int KeyCount =0;
Za,MzKd= static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
99QMMup #pragma data_seg()
!LGnh #+VH]7] 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
yf|,/{S !Cqm=q{K DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
Wp2W:JX: \.0cA4)[$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
$H0diwl9R cKey,UCHAR cMask)
hKkUsY=R {
Ufx^@%v BOOL bAdded=FALSE;
2T3TD% for(int index=0;index<MAX_KEY;index++){
C%c}lv8;^ if(hCallWnd[index]==0){
^3>Qf hCallWnd[index]=hWnd;
MHF31/g\ HotKey[index]=cKey;
Z|78>0SAt HotKeyMask[index]=cMask;
M.DU^-7 bAdded=TRUE;
J#k3iE} KeyCount++;
'(ZJsw break;
Mn)>G36( }
Oup5LH!sW }
p#14 return bAdded;
bxxazsj^ }
|aAu4 //删除热键
`2WtA_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3HtLD5%Q {
?(C(9vO BOOL bRemoved=FALSE;
U,G!u =+ for(int index=0;index<MAX_KEY;index++){
7!-3jU@m if(hCallWnd[index]==hWnd){
kzky{0yKk= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Fe: M'. hCallWnd[index]=NULL;
2X];zY HotKey[index]=0;
2/*F}w/ HotKeyMask[index]=0;
#9R[%R7Nz bRemoved=TRUE;
!@6P>HzY$ KeyCount--;
XsH(8-n0 break;
JpI(Vcd }
`zRE $O }
cImOZx }
jCJbmEfo9@ return bRemoved;
<5Ye')+ }
B~%'YQk O?p8Gjf [H~Yg2O DLL中的钩子函数如下:
gKp5* S%NS7$`a LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
jruXl>T!U {
Lg;b17 BOOL bProcessed=FALSE;
YN=dLr([< if(HC_ACTION==nCode)
SHoov {
su?{Cj6* if((lParam&0xc0000000)==0xc0000000){// 有键松开
96V@+I switch(wParam)
ym\AVRO{ {
E1|> O case VK_MENU:
5g x9W\a ? MaskBits&=~ALTBIT;
T9s$IS , break;
P M
x`PB case VK_CONTROL:
d65fkz==A) MaskBits&=~CTRLBIT;
S_Tv Ix/7& break;
X2RM*y| case VK_SHIFT:
/0S2Omh MaskBits&=~SHIFTBIT;
asT/hsSNS break;
%VV\biO] default: //judge the key and send message
Vxr_2Kra break;
`.MY"g9 }
] "ZL<?3g for(int index=0;index<MAX_KEY;index++){
.o27uB. if(hCallWnd[index]==NULL)
'}nH\?( continue;
|"K< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U@;W^Mt {
gY\g+df- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
r Jo8| bProcessed=TRUE;
V`ODX>\ }
cWNZ +Q8Y }
`6R.*hq }
[lU0TDq else if((lParam&0xc000ffff)==1){ //有键按下
1 #zIAN> switch(wParam)
NWSm {
\d"uR@$3mG case VK_MENU:
T[~8u9/ MaskBits|=ALTBIT;
A#b`{C~l break;
}\iH ~T6 case VK_CONTROL:
!=)R+g6b MaskBits|=CTRLBIT;
8!R +wy break;
sp&s
5aw case VK_SHIFT:
A`5/u"]*D MaskBits|=SHIFTBIT;
WfdM~k\ break;
"e3T;M+ default: //judge the key and send message
i 4}4U break;
WxLmzSz{xD }
x4_xl
. for(int index=0;index<MAX_KEY;index++){
>5O#_? if(hCallWnd[index]==NULL)
|D@/4B1P continue;
fZq_]1(/uP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\Zn%r&( {
"k;j@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)}Vb+ bProcessed=TRUE;
k;7R3O@ }
_v[yY3=3 }
35;UE2d)< }
x|7vN E=Q if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
{?!0<0 for(int index=0;index<MAX_KEY;index++){
s(0S)l< if(hCallWnd[index]==NULL)
mY)Y47iL continue;
NcuZw? if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#mK/xbW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:jKiHeBQu? //lParam的意义可看MSDN中WM_KEYDOWN部分
n#US4&uT4A }
3 L:s5 }
#Epx'$9 }
We8n20wf< return CallNextHookEx( hHook, nCode, wParam, lParam );
J~e%EjN5e }
EgYM][:UU MrW*6jY@ 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
<FkoWN !1X^lFf;~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z PW [GkD BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
KTmduf7DL fwN'5ep 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
6Mh;ld@ S-5|t]LV LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
9Kpzj43 {
F0D7+-9[ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
tc|`cB3f {
0\y{/P?I$ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
fQ[&
^S$ SaveBmp();
UI?AM 34 return FALSE;
Q#h*C
ZT }
zXEu3h …… //其它处理及默认处理
u%s@B1j }
vMlT g?9IS,Gp \ZOH3`vq 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。
+,g"8&> ^xNs^wC. 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。
mDCz=pk)
pxuZ=< 二、编程步骤
YKWiZ dF`\ewRFn 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";
|riP*b fr19C%{ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Miw*L;u@W +=N!37+G 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;
ask76
e 5PRS|R7 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;
NCXr$ES{ 7GFE5>H 5、 添加代码,编译运行程序。
Jc3Z1 Tt hoDE*>i 三、程序代码
d3IMQ_k w nPg ). ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
liuw! #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
~{xm(p #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
MS=zG53y #if _MSC_VER > 1000
p'fD:M: #pragma once
kp$w)%2JW #endif // _MSC_VER > 1000
(b*PDhl`+ #ifndef __AFXWIN_H__
,$,c<M #error include 'stdafx.h' before including this file for PCH
fqY;>Z #endif
`w;8xD( #include "resource.h" // main symbols
9_4bw9A class CHookApp : public CWinApp
nYvx[
zq?^ {
8M~^/Zc public:
y$Y*%D^w CHookApp();
ov9+6'zya // Overrides
"R!)"B== // ClassWizard generated virtual function overrides
'f
"KV| //{{AFX_VIRTUAL(CHookApp)
&yabxl_ public:
e -yL virtual BOOL InitInstance();
e Lj1 virtual int ExitInstance();
4[ .DQ#r //}}AFX_VIRTUAL
'=V!Y$tn //{{AFX_MSG(CHookApp)
rD?G7l<~>_ // NOTE - the ClassWizard will add and remove member functions here.
K.R4.{mo // DO NOT EDIT what you see in these blocks of generated code !
nG~#o //}}AFX_MSG
Rn4Bl8z'> DECLARE_MESSAGE_MAP()
A@?Rj };
?b,x;hIO LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
}j_2K1NS{ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
KT9!R BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*Bm7>g6 BOOL InitHotkey();
^tr?y??k BOOL UnInit();
zT< P_l #endif
~Q3y3,x CC~:z/4,N //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
gR]NH #include "stdafx.h"
nF#1B4b> #include "hook.h"
aQTISX; #include <windowsx.h>
dsiQ~ [
#ifdef _DEBUG
K!cLEG!G #define new DEBUG_NEW
K8?]&.! #undef THIS_FILE
vUNmN2pRJ static char THIS_FILE[] = __FILE__;
Nj^:8]D)0 #endif
ib,BYFKEW #define MAX_KEY 100
fK?/o]vq #define CTRLBIT 0x04
"B34+fOur #define ALTBIT 0x02
fp)%Cr #define SHIFTBIT 0x01
[J-uvxD #pragma data_seg("shareddata")
knS(\51A HHOOK hHook =NULL;
gAPD
y/wM UINT nHookCount =0;
H[M(t^GM static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
n{1;BW#H static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
<8 ,,pOb static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
^F? }MY> static int KeyCount =0;
xk/osbKn static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
CBrC
#pragma data_seg()
A7c*qBt HINSTANCE hins;
Pf/_lBtL void VerifyWindow();
`({Bi!%i BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
pOKs VS%fT //{{AFX_MSG_MAP(CHookApp)
d J|/.J$d // NOTE - the ClassWizard will add and remove mapping macros here.
PCkQ hR // DO NOT EDIT what you see in these blocks of generated code!
~A-vIlGt! //}}AFX_MSG_MAP
iKVJ
c=C END_MESSAGE_MAP()
t~0!K;nn n]Z() "D CHookApp::CHookApp()
!^FR a{b {
v&]k8Hc- // TODO: add construction code here,
~5@bWJ // Place all significant initialization in InitInstance
wa f)S= }
_Xe"+ mFa%d8Y CHookApp theApp;
!C3ozZ< LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
W-8U~*/ {
0hB9D{`,{ BOOL bProcessed=FALSE;
-
fx?@ if(HC_ACTION==nCode)
Gdu5
&]H#6 {
)a=58r07 if((lParam&0xc0000000)==0xc0000000){// Key up
Ix59(g switch(wParam)
tSf$`4 {
|~d8j'rt case VK_MENU:
TaqqEL MaskBits&=~ALTBIT;
.VG5 / 6zp break;
rQLl[a case VK_CONTROL:
[~v1
MaskBits&=~CTRLBIT;
CUI\:a- break;
K4w#}gzok case VK_SHIFT:
+f"q^R IU MaskBits&=~SHIFTBIT;
6M^NZ0~J break;
_B6W:k|-7l default: //judge the key and send message
iU1yJ= break;
/9o
gg }
hziPHuK9, for(int index=0;index<MAX_KEY;index++){
vvwQ/iJO4Q if(hCallWnd[index]==NULL)
\nbGdka continue;
"+sl(A3`U if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A(84cmq!q {
p2I9t| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
l RM7s(^l bProcessed=TRUE;
Iss)7I }
ON-zhT?v }
41XS/# M$* }
.kf FaK else if((lParam&0xc000ffff)==1){ //Key down
~C31=\$ switch(wParam)
S"Z.M _ {
5oTj^W8M( case VK_MENU:
;_dOYG1 MaskBits|=ALTBIT;
h( V:-D break;
3I.0jA#T&/ case VK_CONTROL:
!V O^oD7 MaskBits|=CTRLBIT;
8ZN"-]* break;
oQL$X3S case VK_SHIFT:
>X58 zlxk MaskBits|=SHIFTBIT;
`iZ){JfAH break;
WFm\ bZ. default: //judge the key and send message
30fqD1_{ break;
Bid+,, }
LLD#)Jl{? for(int index=0;index<MAX_KEY;index++)
7)zF8V {
|EZ\+!8N:{ if(hCallWnd[index]==NULL)
3bBCA9^se continue;
(ptk!u6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&peUC n {
!3;KC"o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
A8T75?lL( bProcessed=TRUE;
MY w3+B+Jj }
2AdO }
+LhV4@zC }
1@<PcQBp if(!bProcessed){
|x+g5~$ for(int index=0;index<MAX_KEY;index++){
jxdX7aik if(hCallWnd[index]==NULL)
$_Kcm"oj continue;
Yj{-|2YzL if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
t#N@0kIX. SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
m/bP`-/, }
EN-;@P9;C }
lK"m|Z }
; nc3O{rU
return CallNextHookEx( hHook, nCode, wParam, lParam );
nAT,y9& }
Q^ }Ib[ N/x]-$fl BOOL InitHotkey()
Em]2K: {
ANuO(^ if(hHook!=NULL){
76eF6N+%}t nHookCount++;
!L3\B_# return TRUE;
!e?2
x@J }
$,
vXyZ else
pZ)N,O3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
9NC?J@&B if(hHook!=NULL)
r~YxtBZH+ nHookCount++;
BIY"{"hJ return (hHook!=NULL);
3k# h!Z }
yB5JvD ? BOOL UnInit()
t b>At*tO {
9$s~ `z) if(nHookCount>1){
q(\kCUy! nHookCount--;
n%K^G4k^ return TRUE;
wzf }
"L&84^lmf BOOL unhooked = UnhookWindowsHookEx(hHook);
%?m_;iv if(unhooked==TRUE){
5*\]F} nHookCount=0;
Px?zih!6 hHook=NULL;
r) g:-[Ox9 }
ni?5h5- return unhooked;
C17$qdV/ }
4vJg"*? Ny5$IIFe BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Y6RbRcJw {
/2>.*H_2 BOOL bAdded=FALSE;
NnRX 0] for(int index=0;index<MAX_KEY;index++){
~s2la~gu if(hCallWnd[index]==0){
&cZl2ynPi hCallWnd[index]=hWnd;
S1a6uE HotKey[index]=cKey;
-8Q}*Z HotKeyMask[index]=cMask;
~v6]6+ bAdded=TRUE;
i9eE/
. KeyCount++;
c>%%'c break;
Cs'<;|r( }
821;; ]H }
!,9;AMO
- return bAdded;
")Qhg-l }
;5tQV%V^Q 61Wh %8- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H(tT8Q5i {
1O2jvt7M BOOL bRemoved=FALSE;
Sb.%B^O for(int index=0;index<MAX_KEY;index++){
0b}.!k9 if(hCallWnd[index]==hWnd){
*h
M5pw if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
PVaqKCj:6W hCallWnd[index]=NULL;
5S
4Bz HotKey[index]=0;
VQ8Q=!] HotKeyMask[index]=0;
9xOTR#B:_V bRemoved=TRUE;
Kh7C7[& KeyCount--;
Zg$RiQ^-{J break;
\p#_D|s/Ep }
)x3p7t)# }
W!V-m }
Ya;y@44 return bRemoved;
IG90mpLX }
9`td_qh R!rj:f!> void VerifyWindow()
~EM(*k._ {
rUg|5EN^)d for(int i=0;i<MAX_KEY;i++){
'x<o{Hi"\B if(hCallWnd
!=NULL){ (W
|;gQ
if(!IsWindow(hCallWnd)){ b6! 7j
hCallWnd=NULL; ^{a_:r"
HotKey=0; zs.@=Z"
HotKeyMask=0; d}<-G.&_
KeyCount--; `r]C%Y4?
} =Q #d0Q
} 2H/{OQ$
} mo"1|Q&
} elz0t<V
,</Kn~b
BOOL CHookApp::InitInstance() &l0,q=T
{ 3z% W5[E)
AFX_MANAGE_STATE(AfxGetStaticModuleState()); `(M0I!t
hins=AfxGetInstanceHandle(); 0i(c XB
InitHotkey(); ^s\T<;
return CWinApp::InitInstance(); 4{ [d '-H5
} Mc{-2
z) x.6
int CHookApp::ExitInstance() XD Q<28^
{ -z">ov-)
VerifyWindow(); Lk.tEuj=82
UnInit(); OMAvJzK .
return CWinApp::ExitInstance(); $r)NL
} n(W&GSj|u9
Muyi2F)j
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7Q9| P?&:z
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }$b!/<7FD
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ S0`u!l89(
#if _MSC_VER > 1000 VIg6'
#pragma once L*cP8v4
#endif // _MSC_VER > 1000 8^67,I-c
L_q3m-x0h
class CCaptureDlg : public CDialog WAf"|
{ C{~O!^2G
// Construction .'NTy
R
public: +F*h\4ry#
BOOL bTray; q6}KOO)
BOOL bRegistered; " c+$GS
BOOL RegisterHotkey(); }#S1!TU
UCHAR cKey; iN_P25Z<r
UCHAR cMask; /[!<rhY
void DeleteIcon(); g(i8HU*{q
void AddIcon(); $LVzhQlD
UINT nCount; [eFJ+|U9
void SaveBmp(); uU=!e&3
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ygc|9}
// Dialog Data K>TEt5
//{{AFX_DATA(CCaptureDlg) 0\V)DV.i
enum { IDD = IDD_CAPTURE_DIALOG }; =#vJqA
CComboBox m_Key; _9'hmej
BOOL m_bControl; qWJHb Dd
BOOL m_bAlt; V''fmWo7
BOOL m_bShift; / ;+Mz*
CString m_Path; U4qk<!
CString m_Number; R_b4S%jhx
//}}AFX_DATA yMt:L)+
// ClassWizard generated virtual function overrides qkqtPbQ 7
//{{AFX_VIRTUAL(CCaptureDlg) c
Qe3
public: `g<0FQA
virtual BOOL PreTranslateMessage(MSG* pMsg); WF:4p]0~)
protected: }R/we`
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %/
"yt}"|
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2#ZqGf.'v
//}}AFX_VIRTUAL Bo\~PV[
// Implementation 8tVSai8[
protected: x~=Mn%Ew0
HICON m_hIcon; iH~A7e62OZ
// Generated message map functions 7$x%A&]
//{{AFX_MSG(CCaptureDlg) 1OV] W
f
virtual BOOL OnInitDialog(); [SD
mdr1T$
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hM[3l1o{|
afx_msg void OnPaint(); *qu5o5Q
afx_msg HCURSOR OnQueryDragIcon(); eL.WP`Lz
virtual void OnCancel(); 56Z
afx_msg void OnAbout(); E#,\[<pc
afx_msg void OnBrowse(); U8-OQ:2.
afx_msg void OnChange(); HD& Cp
//}}AFX_MSG T2_iH=u
DECLARE_MESSAGE_MAP() Z}{]/=h
}; Xppv
#endif Uf
MQ?(,
qoZ)"M
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,.h@tN<C
#include "stdafx.h" EwmNgmYq
#include "Capture.h" >TiEYMW
#include "CaptureDlg.h" /8!n7a7
#include <windowsx.h> /;{L~f=et)
#pragma comment(lib,"hook.lib") ([^#.x)hz
#ifdef _DEBUG I@\D
tQZ
#define new DEBUG_NEW w=3
j'y{f
#undef THIS_FILE 9dm<(I}
static char THIS_FILE[] = __FILE__; \&~YFj B
#endif RAnF=1[v
#define IDM_SHELL WM_USER+1 1;'-$K`}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }h1eB~6M
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bYZU}Kl;(
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _#MKp H
class CAboutDlg : public CDialog /DP0K
@%
{ 8_o~0lb
public: sT "q]
CAboutDlg(); i+pQ 7wx
// Dialog Data c&,q`_t
//{{AFX_DATA(CAboutDlg) oz]&=>$1I
enum { IDD = IDD_ABOUTBOX }; \
\Tz'>[\
//}}AFX_DATA D[}^G5
// ClassWizard generated virtual function overrides t&NpC;>v
//{{AFX_VIRTUAL(CAboutDlg) RWX!d54&
protected: \Rb:t}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^do6?e`?-
//}}AFX_VIRTUAL >#'?}@FWQN
// Implementation ^b}Wl0Fn
protected: C/H;|3.X
//{{AFX_MSG(CAboutDlg) LAY:R{vI
//}}AFX_MSG _*n
`*"
DECLARE_MESSAGE_MAP() fms(_Q:R?
}; cA|vH^:
sOiM/}O]
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =FI[/"476
{ Yi)s=Q :
//{{AFX_DATA_INIT(CAboutDlg) :YOo"3.]
//}}AFX_DATA_INIT %K.r rn M
} N3*1,/,l.
F_m'
9KX4E
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g<,0kl2'S
{ 0 q1x+
CDialog::DoDataExchange(pDX); 0
x' d^
//{{AFX_DATA_MAP(CAboutDlg) (xoYYO
//}}AFX_DATA_MAP uubIL+
} 17,mqXX>
+GL$[ 5G
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SWY
//{{AFX_MSG_MAP(CAboutDlg) RgL>0s
// No message handlers +
d 3
//}}AFX_MSG_MAP gu%i|-}
END_MESSAGE_MAP() k3nvML,bv
.Gvk5Wn
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) , ,ng]&%i
: CDialog(CCaptureDlg::IDD, pParent) !c{F{t-a
{ $IjI{%
//{{AFX_DATA_INIT(CCaptureDlg) U8y?S]}vo
m_bControl = FALSE; R&&&RI3{
m_bAlt = FALSE; DW78SoyedZ
m_bShift = FALSE; $evuL3GY#
m_Path = _T("c:\\"); 3-, W?
"aC
m_Number = _T("0 picture captured."); s@5~HyeI
nCount=0; iP;"-Mj
bRegistered=FALSE; FpU8$o~r{
bTray=FALSE; Q;!rN)
//}}AFX_DATA_INIT m{?f,Q=u@
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 RPte[tq
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -`eB4j'7
} kd\Hj~*
g>;@(:e^/
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;^0rY )&
{ 4#7*B yvf
CDialog::DoDataExchange(pDX); QIlZZ
//{{AFX_DATA_MAP(CCaptureDlg) "}`)s_rt
DDX_Control(pDX, IDC_KEY, m_Key); S4[#[w`=
DDX_Check(pDX, IDC_CONTROL, m_bControl); _ZFEo< `'
DDX_Check(pDX, IDC_ALT, m_bAlt); o kA<
DDX_Check(pDX, IDC_SHIFT, m_bShift); %D8.uGsh
DDX_Text(pDX, IDC_PATH, m_Path); 3+s$K(% I
DDX_Text(pDX, IDC_NUMBER, m_Number); W]7/
e
//}}AFX_DATA_MAP .-/IV^lGv
} .|5$yGEF_+
QkW'tU\^
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /*k_`3L
//{{AFX_MSG_MAP(CCaptureDlg) FKz5,PeL
ON_WM_SYSCOMMAND() wT6zeEV~*
ON_WM_PAINT() <F;+A{M)
ON_WM_QUERYDRAGICON() `]XI Q\ *
ON_BN_CLICKED(ID_ABOUT, OnAbout) 7pciB}$2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) FVBAB>
ON_BN_CLICKED(ID_CHANGE, OnChange) 0V21_".S
//}}AFX_MSG_MAP X?wZ7*'1
END_MESSAGE_MAP() Bf;_~1+vLG
`OWHf?t:
BOOL CCaptureDlg::OnInitDialog() y%;o
{ z\A
),;
CDialog::OnInitDialog(); S#v3%)R
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); YzQ1c~+
ASSERT(IDM_ABOUTBOX < 0xF000); |\?u-O3
CMenu* pSysMenu = GetSystemMenu(FALSE); PnaiSt9p?r
if (pSysMenu != NULL) eh `%E0b}
{ %K-8DL8|(
CString strAboutMenu; '&B4Ccn<V
strAboutMenu.LoadString(IDS_ABOUTBOX); H~nZ=`P9&
if (!strAboutMenu.IsEmpty()) FX|&o>S(8
{ &JqaIJh
pSysMenu->AppendMenu(MF_SEPARATOR); O>1Cx4s5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); J-,ocO
} 3^~J;U!3
} ^Y%_{
SetIcon(m_hIcon, TRUE); // Set big icon 3]*1%=~X/
SetIcon(m_hIcon, FALSE); // Set small icon ]VLseF
m_Key.SetCurSel(0); 3oMHy5
RegisterHotkey(); ZIc.MNq
CMenu* pMenu=GetSystemMenu(FALSE); S7Ty}?E@
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ec3tfcNhR
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9 %4:eTcp
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;tZQ9#S
return TRUE; // return TRUE unless you set the focus to a control ^PezV5(
} PC<_1!M]
]2qKc
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7<;oz30G!L
{ yG/!K uA
if ((nID & 0xFFF0) == IDM_ABOUTBOX) =
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{ -[
gT}{k!
CAboutDlg dlgAbout;
Pap6JR{7
dlgAbout.DoModal(); 'u;O2$
} _3yG<'f[Y
else Z9+fTT
{ H4AT>}ri
CDialog::OnSysCommand(nID, lParam); tLa%8@;'$
} |oXd4
} ZDbe]9#Xh
Q]/%Y[%|
void CCaptureDlg::OnPaint() QR'# ]k;>%
{ w"s@q$}]8M
if (IsIconic()) FZj>N(
{ k-=LD
CPaintDC dc(this); // device context for painting o?hr>b
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); p ZTrh&I]
// Center icon in client rectangle >a<1J(c
int cxIcon = GetSystemMetrics(SM_CXICON); .E}lAd.Mn
int cyIcon = GetSystemMetrics(SM_CYICON); I"vkfi#=
CRect rect; X]D,kKasG
GetClientRect(&rect); T TN!$?G3
int x = (rect.Width() - cxIcon + 1) / 2; 9"]#.A^Q*
int y = (rect.Height() - cyIcon + 1) / 2; ucx02^uA
// Draw the icon }}QR'
dc.DrawIcon(x, y, m_hIcon); 3>@VPMi
} }\?9Prsd
else -;L'Jb>s76
{ , i5 _4
CDialog::OnPaint(); WJnGF3G>
} ebQgk
Y=
} :1>?:3,`
@
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HCURSOR CCaptureDlg::OnQueryDragIcon() ngl +`|u
{ p|ink):
return (HCURSOR) m_hIcon; Pa{
} f(Of+>
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void CCaptureDlg::OnCancel() N8dxgh!,
{ ?l^Xauk4Pj
if(bTray) Pp tuXq%U
DeleteIcon(); Jq'8"
CDialog::OnCancel(); _o$jk8jOjW
} ~!
-JN}H m
mnsl$H_4S
void CCaptureDlg::OnAbout() XAU%B-l:
{ QE\
[EI2
CAboutDlg dlg; JUpV(p"-r
dlg.DoModal(); LD}~]
}
-9i7Ja
]2wxqglh)
void CCaptureDlg::OnBrowse() #Or;"}P>fB
{ o6k#neB>=.
CString str; $zjdCg<
BROWSEINFO bi; Km8aHc]O~
char name[MAX_PATH]; D![v{0 er
ZeroMemory(&bi,sizeof(BROWSEINFO)); :]m.&r S,
bi.hwndOwner=GetSafeHwnd(); + '_t)k^
bi.pszDisplayName=name; LnI
bi.lpszTitle="Select folder"; p2i?)+z
bi.ulFlags=BIF_RETURNONLYFSDIRS; +SH{`7r
LPITEMIDLIST idl=SHBrowseForFolder(&bi); mOsp~|d
if(idl==NULL) '|zrzU=
return; 5FoZ$I
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hu.o$sV3;
str.ReleaseBuffer(); :lcq3iFn
m_Path=str; ^!&6=rb
if(str.GetAt(str.GetLength()-1)!='\\') eMJ>gXA]
m_Path+="\\"; v\Uk?V5T
UpdateData(FALSE); 4V')FGB$
} Dp
](?Yr
j )6
void CCaptureDlg::SaveBmp() V}#X'~Ob
{ l[38cF
CDC dc; t~->&Ja
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5*pzL0,Y
CBitmap bm; AAevN3a#nI
int Width=GetSystemMetrics(SM_CXSCREEN); l4oyF|oJTH
int Height=GetSystemMetrics(SM_CYSCREEN); Icnhet4
bm.CreateCompatibleBitmap(&dc,Width,Height); l}))vf=i
CDC tdc; 27e!KG[&
tdc.CreateCompatibleDC(&dc); YB5"i9T2
CBitmap*pOld=tdc.SelectObject(&bm); FvxM
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -)`_w^Ox
tdc.SelectObject(pOld); lD/9:@q\V
BITMAP btm; J+u}uN@
bm.GetBitmap(&btm); v _MQ]X
DWORD size=btm.bmWidthBytes*btm.bmHeight; l<`>
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (90/,@66l
BITMAPINFOHEADER bih; _fHml
bih.biBitCount=btm.bmBitsPixel; b|d-vnYE
bih.biClrImportant=0; *|fF;-#v
bih.biClrUsed=0; WEimJrAn
bih.biCompression=0; ^Co$X+
bih.biHeight=btm.bmHeight; >X*tMhcb
bih.biPlanes=1; 7MKX`S
bih.biSize=sizeof(BITMAPINFOHEADER); KUAzJ[>
bih.biSizeImage=size; TN2Ln?[xU
bih.biWidth=btm.bmWidth; ? nd:
:O
bih.biXPelsPerMeter=0; hy5[
L`B
bih.biYPelsPerMeter=0; 4+RR`I8$Ge
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @%]A,\
static int filecount=0; 4I$Y(E}
CString name; AI-*5[w#A
name.Format("pict%04d.bmp",filecount++); 2*|T)OA`m,
name=m_Path+name; k {*QU(
BITMAPFILEHEADER bfh; ysW})#7X
bfh.bfReserved1=bfh.bfReserved2=0; &]nx^C8V;
bfh.bfType=((WORD)('M'<< 8)|'B'); %;,fI'M
bfh.bfSize=54+size; ci~#G[_$S
bfh.bfOffBits=54; ^`&'u_B!+
CFile bf; r7m~.M+W"
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b dgkA
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); H@Z_P p?
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;)(g$r^_i
bf.WriteHuge(lpData,size); D@O`"2
bf.Close(); $5R2QNg n
nCount++; cMw<3u\
} 6>a6;[
GlobalFreePtr(lpData); m9 h '!X<
if(nCount==1) >
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m_Number.Format("%d picture captured.",nCount); 35<A:jKS
else 4<y
m_Number.Format("%d pictures captured.",nCount); 8QrpNSj4
UpdateData(FALSE); j[G`p^ul
} }aZuCe_
k?+ 7%A]
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) l|P"^;*zq
{ Yj/afn(Jt
if(pMsg -> message == WM_KEYDOWN) 'NEl`v*<P
{ j/O~8o&
if(pMsg -> wParam == VK_ESCAPE) i5VZ,E^E
return TRUE; )6OD@<r{
if(pMsg -> wParam == VK_RETURN) ?[ xgt)
return TRUE; Hr|f(9xA
} -*C
WF|<G
return CDialog::PreTranslateMessage(pMsg); IOy0WHl|
} &9L4
t%As
5R7x%3@L
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v@_1V
{ mci> MEb
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G{U#9
SaveBmp(); IiU> VLa
return FALSE; XB)D".\
} $|N6I
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M.W
X&;>
CMenu pop; T
ozx0??)
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (bsx|8[
CMenu*pMenu=pop.GetSubMenu(0); |&; ^?M
pMenu->SetDefaultItem(ID_EXITICON); (2g
a:}K
CPoint pt; cHjQwl
GetCursorPos(&pt); B~p%pTS+
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -'! J?~
if(id==ID_EXITICON) k^J8 p#`6
DeleteIcon(); 8<=^Rkz
else if(id==ID_EXIT) o?`FjZ6;x
OnCancel(); J]F&4O
return FALSE; mMAN*}`O
} ?Nos;_/
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8Zr;n`~
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ul~ux$a
AddIcon(); x/*lNG/
return res; ;J%:DD
} ^/f~\#R
SyWZOE%p
void CCaptureDlg::AddIcon() |cvU2JI@
{ L5&M@YTH
NOTIFYICONDATA data; st-{xC#N#
data.cbSize=sizeof(NOTIFYICONDATA); lSxb:$g
CString tip; XkaREE
tip.LoadString(IDS_ICONTIP); u#0snw~)/
data.hIcon=GetIcon(0); =RoG?gd{R
data.hWnd=GetSafeHwnd(); A;oHji#*
strcpy(data.szTip,tip); 3:J>-MO
data.uCallbackMessage=IDM_SHELL; g`XngRb|j
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &V].,12x
data.uID=98; H>~ CL
Shell_NotifyIcon(NIM_ADD,&data); iC"iR\Qu
ShowWindow(SW_HIDE); z0z@LA4k6@
bTray=TRUE; }w0pi
} r&gvP|W%
kSAVFzUS
void CCaptureDlg::DeleteIcon() T5XXC1+
{ D6"=2XR4n
NOTIFYICONDATA data; -l^<[%
data.cbSize=sizeof(NOTIFYICONDATA); j*{0<hZb}
data.hWnd=GetSafeHwnd(); !~ox;I}S
data.uID=98; >3 o4 U2
Shell_NotifyIcon(NIM_DELETE,&data); 6(n0{A
ShowWindow(SW_SHOW); X1j8tg
SetForegroundWindow(); iT]t`7R
ShowWindow(SW_SHOWNORMAL); Rh>B#
\
bTray=FALSE; $7x2TiAL
} s8h*nZ)v
<b 5DX
void CCaptureDlg::OnChange() Aoe\\'O|V
{ 8Fn\ycX#"l
RegisterHotkey(); M0V<Ay\%O
} m,.Y:2?*V
+VIA@`4
BOOL CCaptureDlg::RegisterHotkey() 0vY_
{ (3Db}Hnn
UpdateData(); I2[U #4n
UCHAR mask=0; D"7}&Ry:
UCHAR key=0; 55S s%$k@
if(m_bControl) `TrWtSwv
mask|=4; 9LR=>@Z
if(m_bAlt) C6!F6Stn]g
mask|=2; 9`in
r.:
if(m_bShift) 56V|=MzX]
mask|=1; HD j6E"
key=Key_Table[m_Key.GetCurSel()]; FI.te3i?7
if(bRegistered){ O?uICnmi6
DeleteHotkey(GetSafeHwnd(),cKey,cMask); RvzZg%)
bRegistered=FALSE; w~lH2U'k}
} sSM"~_y\
cMask=mask; l;-Ml{}|0
cKey=key; j G8;p41
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a4Q@sn;]
return bRegistered; }(EH5jZ'
} e3I""D{)[=
/jv/qk3i
四、小结 5.rAxdP
$dC`keQM>9
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。