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:
*!%y.$\cE
Ttn=VX{
\ 一、实现方法
/ivt 8Uiw #9EpQc[4 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:
GV6!`@< W*;~(hDz #pragma data_seg("shareddata")
'IP'g,o++ HHOOK hHook =NULL; //钩子句柄
NZ9=hI;iM UINT nHookCount =0; //挂接的程序数目
GBtBmV/` static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
'@2pOq static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
5[`!\vCiZ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
\6)l(b; static int KeyCount =0;
'P32G?1C&p static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
$5r[YdnY< #pragma data_seg()
w;0NtV| d]VL(& 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
\hQ[5> cZ\#074u/ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
wX8T;bo& `B) ~ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
XD{U5.z>y cKey,UCHAR cMask)
1""9+4 {
5X\3y4 BOOL bAdded=FALSE;
,Bp\ i for(int index=0;index<MAX_KEY;index++){
/u!I2DF if(hCallWnd[index]==0){
,d)!&y hCallWnd[index]=hWnd;
_ot4HmD HotKey[index]=cKey;
h|yv*1/| HotKeyMask[index]=cMask;
G^p>fy~ bAdded=TRUE;
qWKpnofa KeyCount++;
v~q2D" break;
Ge@./SGT }
d{hbgUSj }
\v9IbU*js return bAdded;
~-GgVi*I }
u@}((V //删除热键
T=:O(R1*0 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\ :8~na+( {
)s,L:{< BOOL bRemoved=FALSE;
!~04^( for(int index=0;index<MAX_KEY;index++){
p&B98c if(hCallWnd[index]==hWnd){
*rSMD_> if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
:g2?)Er- hCallWnd[index]=NULL;
Wd_bDZQ HotKey[index]=0;
OZ&J'Y HotKeyMask[index]=0;
-LzHCO/7( bRemoved=TRUE;
%Z 9<La KeyCount--;
!e&ZhtTuC break;
`Q1S8i$ }
r|:|\"Yk }
A`Z!=og= }
j;<Yje&Wz return bRemoved;
-2o4v#d }
VxLq,$B76 <oI{:KH w3 PE.A"Q DLL中的钩子函数如下:
v#a`*^ ^ b(_PCVC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
( u@[}! {
.6xP>!E}Q BOOL bProcessed=FALSE;
GbwcbfH if(HC_ACTION==nCode)
^6#FqK+{u {
S9<J\`FG if((lParam&0xc0000000)==0xc0000000){// 有键松开
\U4O*lq switch(wParam)
YM
0f_G= {
?Vb=W)Es case VK_MENU:
1}tZ,w> MaskBits&=~ALTBIT;
yAU[A break;
|rH;}t|un case VK_CONTROL:
dD1`[% MaskBits&=~CTRLBIT;
%Xh/16X${ break;
O4$ra;UM` case VK_SHIFT:
<wFR%Y/j MaskBits&=~SHIFTBIT;
&Sj<X`^ break;
.S`Ue,H default: //judge the key and send message
R5ZnkPEA break;
xAYC%) }
m}T^rX%m_ for(int index=0;index<MAX_KEY;index++){
Pg-~^"?y if(hCallWnd[index]==NULL)
pB|L%#.cW continue;
ro6|N?' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-?!|W-}@G= {
8U/q3@EC SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
;y%l OYm bProcessed=TRUE;
bEV
9l }
Z 7t 0=U }
CCDoiTu!4 }
pL]C]HGv else if((lParam&0xc000ffff)==1){ //有键按下
C.C)&&|X switch(wParam)
R,C)|*ef {
0J_ AX case VK_MENU:
5znLpBX<N MaskBits|=ALTBIT;
S59!+V break;
{W3%n* q case VK_CONTROL:
$7a|
9s0 MaskBits|=CTRLBIT;
o\@1\#a break;
9<k<HmkD case VK_SHIFT:
j?i Ur2 MaskBits|=SHIFTBIT;
6i(V+ break;
MX|CL{H default: //judge the key and send message
{q~Bss{z break;
)UI$s" }
xgrk>Fb|R for(int index=0;index<MAX_KEY;index++){
FAjO-T4( if(hCallWnd[index]==NULL)
ZD6rD(l9 continue;
}Y(Q7l if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
N6c']!aM@ {
jj0@ez{3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
:4}?%3&; bProcessed=TRUE;
YPDc
/ }
?1xBhKq }
6TbDno/!' }
F@kOj*5,[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
fGcAkEstT! for(int index=0;index<MAX_KEY;index++){
d@b 0z$<s if(hCallWnd[index]==NULL)
tE]g*]o continue;
,ZJI]Q=! if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Z@nM\/vLA SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
)F0_V
4 //lParam的意义可看MSDN中WM_KEYDOWN部分
'X_iiR8n@p }
U`,&Q] }
[@"H2#CQ }
?;0=>3p*0 return CallNextHookEx( hHook, nCode, wParam, lParam );
kWF4k }
Hig=PG5I ;*:d)'A 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
HW|c -\tS ZFOYYht BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
UG s
<< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
I.fV_
H^ >B>CV8p6w 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
RecA?-0 O4@Ki4f3A% LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
-DlKFN {
NS#qein~i if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
oIt.Pc~;'# {
zG[fPD //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
doBfpQ2 SaveBmp();
o$\{&:y return FALSE;
y+(<Is0w }
T$06DS …… //其它处理及默认处理
H:`W\CP7_ }
D=mU!rjr1 Lbq"( b +>.plvZhu 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。
fNFdZ[qOd ,yWTkql 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。
?Gp~i] v>c[wg9P 二、编程步骤
jm =E_86_ Oe'Nn250
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";
c#OZ=` 0Q;T
<%U 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
)*G3q/l1u6 M`FsKK` 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;
DvG. G+mo# W2wDSP- 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;
O*z x{a6 H #E
5、 添加代码,编译运行程序。
6ApW+/ [NFg9y;{h 三、程序代码
;} gvBI2e ""^9WLH4g- ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Vt5%A}.VQ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
j+*VP #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
@!Il!+^3 #if _MSC_VER > 1000
teUCK(;23 #pragma once
,4NvD2Y #endif // _MSC_VER > 1000
.Y&_k #ifndef __AFXWIN_H__
394u']M #error include 'stdafx.h' before including this file for PCH
itm;, Sbg #endif
`kwyF27v] #include "resource.h" // main symbols
*na7/ysT< class CHookApp : public CWinApp
mppBc-#EYr {
E,xCfS) public:
xii*"n ~ CHookApp();
Q~,E
K // Overrides
L-Xd3RCD // ClassWizard generated virtual function overrides
Fz?ON1\ //{{AFX_VIRTUAL(CHookApp)
7_S+/2}U* public:
$P^=QN5Bb virtual BOOL InitInstance();
<.l5>mgkCw virtual int ExitInstance();
Y3-Tg~/~W //}}AFX_VIRTUAL
eoR@5OA& //{{AFX_MSG(CHookApp)
mZ/?uPIa // NOTE - the ClassWizard will add and remove member functions here.
,'Y*e[ // DO NOT EDIT what you see in these blocks of generated code !
6"|PJ_@P //}}AFX_MSG
|E53
[:p DECLARE_MESSAGE_MAP()
6aM`qz) };
lDe9EJR LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
#Q^mdv? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Cs^o- g!L BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
HNY{%D BOOL InitHotkey();
'$
s:cS`= BOOL UnInit();
(dpBGt@ #endif
? Q.Y E-X-LR{CC //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
\Wt&z, #include "stdafx.h"
F`
J(+ #include "hook.h"
Kw(/#C:$ #include <windowsx.h>
S? r:=GS #ifdef _DEBUG
]}ff*W #define new DEBUG_NEW
l2gI2Cioa #undef THIS_FILE
L^RyJ;^c static char THIS_FILE[] = __FILE__;
`*KS`
z? #endif
IB}.J,= #define MAX_KEY 100
iFF/[P #define CTRLBIT 0x04
1Lqs>* #define ALTBIT 0x02
6:v8J1G(< #define SHIFTBIT 0x01
i/C#fIB2 #pragma data_seg("shareddata")
QDBptI: HHOOK hHook =NULL;
bTA<AoW9=" UINT nHookCount =0;
aMm`G}9n static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
2YuaPq/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
OMJr.u static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
]
X%bU*4 static int KeyCount =0;
)09_CC!a static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ksu:RJ- #pragma data_seg()
q<oA%yR HINSTANCE hins;
VY=~cVkzS void VerifyWindow();
GY@Np^>[a BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
9rn! U2 //{{AFX_MSG_MAP(CHookApp)
6C
r$R]5 // NOTE - the ClassWizard will add and remove mapping macros here.
SK;f#quUQ // DO NOT EDIT what you see in these blocks of generated code!
@faf //}}AFX_MSG_MAP
6@H&S END_MESSAGE_MAP()
L
nw+o} DSd 5? CHookApp::CHookApp()
Y
+HVn0~qz {
"N4c>2Q // TODO: add construction code here,
xqP0Z),Ow // Place all significant initialization in InitInstance
BAzc'x&< }
Gg5vf]VFo &Radpb2p6 CHookApp theApp;
/Klwh1E LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
js;IUSj. {
LFen!FnM BOOL bProcessed=FALSE;
8'^eH1d' if(HC_ACTION==nCode)
Y)BKRS~ {
5kC#uk if((lParam&0xc0000000)==0xc0000000){// Key up
t,k9:p switch(wParam)
D@DK9?# {
5Tn4iyg;B case VK_MENU:
!RiPr(m@y MaskBits&=~ALTBIT;
:".!6~:2 break;
MAJvjgd.. case VK_CONTROL:
h2=zvD; MaskBits&=~CTRLBIT;
rp=?4^(u break;
%{zM> le9 case VK_SHIFT:
8y|(]5
'r MaskBits&=~SHIFTBIT;
LwY_6[Ef break;
m6lNZb] default: //judge the key and send message
JC>}(yQA break;
_AVCh)Zb }
*aG0p&n} for(int index=0;index<MAX_KEY;index++){
-[^wYr= if(hCallWnd[index]==NULL)
AuO%F
YKY continue;
07/5RFmJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-BEPpwb<g {
?ZTB u[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
S'ikr bProcessed=TRUE;
7-^df0 }
<408lm }
~ikTo - }
HK2`.'D else if((lParam&0xc000ffff)==1){ //Key down
y)s/\l& switch(wParam)
;R2(Gb {
em>CSBx case VK_MENU:
Yd/qcC(& MaskBits|=ALTBIT;
{W `/KU?u break;
X 8[T*L. case VK_CONTROL:
2$T~(tem MaskBits|=CTRLBIT;
WY*}|R2R break;
=1\'xz}p? case VK_SHIFT:
!my5-f>{( MaskBits|=SHIFTBIT;
9]AKNQq m break;
?#FAa, default: //judge the key and send message
^e&,<+qY break;
s-8>AW
ep }
jg%D
G2 for(int index=0;index<MAX_KEY;index++)
jj.]R+.G {
ceZt%3=5 if(hCallWnd[index]==NULL)
<<UlFE9" continue;
k{@z87+& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ch7eUTqA@ {
AiO,zjM = SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ISq^V bProcessed=TRUE;
RKjA`cJ }
-09<; U }
|/p^e }
3%cNePlr if(!bProcessed){
x; b'y4kH for(int index=0;index<MAX_KEY;index++){
$f)Y
!<bC if(hCallWnd[index]==NULL)
\u)s Zh continue;
`-w;=_Bm if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>fb*X'Zi% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Z.h`yRhO }
8nZPY)o }
Aq";z.gi+ }
F6q}(+9i return CallNextHookEx( hHook, nCode, wParam, lParam );
{p2%4 }
_a.Q@A4' *qpmI9m BOOL InitHotkey()
$1?YVA7 {
751\K`L if(hHook!=NULL){
N0.-#Qa nHookCount++;
/CX<k gz@ return TRUE;
j?.VJ^Ff/u }
c*ytUI* else
zA+^4/M hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
pl7!O9bo if(hHook!=NULL)
x&;{4F Nw nHookCount++;
%ecg19~L/} return (hHook!=NULL);
cFH,fj }
R0m}I5Frs BOOL UnInit()
=(hEr=f>7 {
X7n~Ws&s@ if(nHookCount>1){
B*?v`6 nHookCount--;
ueqR@i return TRUE;
JFZZ-t;* }
e@I?ESZ5 BOOL unhooked = UnhookWindowsHookEx(hHook);
7J')o^MG if(unhooked==TRUE){
IHB{US1G nHookCount=0;
?;i6eg17< hHook=NULL;
koAc-o
}
u}ab[$Q5 return unhooked;
X59~)rH, }
szKs9er& x$A5Ved BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8E$KR:/:4 {
A4SM@ry BOOL bAdded=FALSE;
y#T":jpR for(int index=0;index<MAX_KEY;index++){
!5{t1 oJ if(hCallWnd[index]==0){
z{tyB hCallWnd[index]=hWnd;
.c BJA&/ HotKey[index]=cKey;
pX2 Ki^)] HotKeyMask[index]=cMask;
a{H~>d<? bAdded=TRUE;
o3uv"#
C KeyCount++;
2I#fwsb break;
]huqZI }
*.Kc-f4mP }
:uMD$zF'5 return bAdded;
8-+IcyUza }
-5E%f|U .Cm wR$u& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*SC~_ {
))k^7g9M` BOOL bRemoved=FALSE;
/@% for(int index=0;index<MAX_KEY;index++){
M)-+j{< if(hCallWnd[index]==hWnd){
w#-rl@JQ4 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r$0"Y-a hCallWnd[index]=NULL;
H!vvdp?Z HotKey[index]=0;
`U?;9!|;6 HotKeyMask[index]=0;
IY :iGn8R bRemoved=TRUE;
9i9VDk{ KeyCount--;
}rOO[,?Y break;
k^ID }
3+(Fq5I }
_-&Au%QNJ` }
RdvJA:;q return bRemoved;
Zcdt\;HKr }
w3B*%x) 0HF",:yl void VerifyWindow()
\|wVIi {
O </< for(int i=0;i<MAX_KEY;i++){
7@C:4c@0 if(hCallWnd
!=NULL){ e;[/ytz"d'
if(!IsWindow(hCallWnd)){ 44b'40
hCallWnd=NULL; +[D=2&tmk
HotKey=0; /FB '
HotKeyMask=0; w~1K93/p!
KeyCount--; LN_6>u
} dD!} P$
} dNbN]gHC
} wUl}x)xo
} 9jJ&QACn
x?f3XEA_
BOOL CHookApp::InitInstance() R$cg\DD
{ {n|Ra[9_
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;m7$U
hins=AfxGetInstanceHandle(); ~|fd=E%
InitHotkey(); g.&&=T
return CWinApp::InitInstance(); |J~;yO SD
} >#xpg&2x
iPI6 _h
int CHookApp::ExitInstance() 8m-ryr)
{ GHH1jJ_[7
VerifyWindow(); |} .Y&1@U
UnInit(); C>t1~^Q},9
return CWinApp::ExitInstance(); nh,N(t9
} QT?fp
>'
ZJI|762,
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V.:imj
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |'1[\<MM3
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ whxE[Xnv
#if _MSC_VER > 1000 :?yv0Iu
#pragma once t0Ec`+)
#endif // _MSC_VER > 1000 8 =J6{{E
b9`MUkGGd
class CCaptureDlg : public CDialog /Nb&e
{ gdHPi;
// Construction <Gs)~T#'
public: #;2Ju'e#z
BOOL bTray; F)
< f8F
BOOL bRegistered; =V%s^
BOOL RegisterHotkey(); .:$%3#N$(Y
UCHAR cKey; u["Pg
UCHAR cMask; O@??
NF6G
void DeleteIcon(); l[rIjyL@
void AddIcon(); EPdR-dC^wE
UINT nCount; @S<=Okrlj
void SaveBmp(); ezy0m}@
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]\*g/QV
// Dialog Data ~@TNVkw
//{{AFX_DATA(CCaptureDlg) k>U&Us0
enum { IDD = IDD_CAPTURE_DIALOG }; 8?P@<Do%
CComboBox m_Key; .hBE&Y>\
BOOL m_bControl; HWD
BOOL m_bAlt; Exk[;lI
BOOL m_bShift; t\u0\l>
CString m_Path; lSl=6R
CString m_Number; > : \lDz
//}}AFX_DATA ^!N _Nx/M
// ClassWizard generated virtual function overrides 6z!?U:bT
//{{AFX_VIRTUAL(CCaptureDlg) Zwp*JH+G
public: V$<og
virtual BOOL PreTranslateMessage(MSG* pMsg); C$
nT&06o
protected: F8>Fp"
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j$Gb>Ex>
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); MS><7lk-
//}}AFX_VIRTUAL ysDfp'C,
// Implementation |cUlXg=
protected: I.1zD aP
HICON m_hIcon; )!){4c/
// Generated message map functions >\3=h8zw
//{{AFX_MSG(CCaptureDlg) OBl-6W
virtual BOOL OnInitDialog(); H2|&
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); t&H) :P
afx_msg void OnPaint(); -=5z&)
X
afx_msg HCURSOR OnQueryDragIcon(); jK3% \`o
virtual void OnCancel(); Bk~WHg>@G
afx_msg void OnAbout(); ^|-x mUC
afx_msg void OnBrowse(); ,W7\AY07]
afx_msg void OnChange(); X^r HugQ
//}}AFX_MSG r9z/hm}E
DECLARE_MESSAGE_MAP() jZ7#xRt5w
}; :C_\.pA
#endif vgo-[^FiP$
4Poi:0oOys
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _`*x}
#include "stdafx.h" 97NF*-)N
#include "Capture.h" k9'%8(7M:
#include "CaptureDlg.h" 8cF-kfbfZ
#include <windowsx.h> \0'o*nlJ
#pragma comment(lib,"hook.lib") ,/ly|Dv
#ifdef _DEBUG {pE")O7~P
#define new DEBUG_NEW =H3 JRRS
#undef THIS_FILE OGrp{s
static char THIS_FILE[] = __FILE__; N:\I]M
#endif ;v*$6DIC5
#define IDM_SHELL WM_USER+1 n3jA[p:
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x]XhWScr'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v-2.OS<o
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )9{?C4NQ
class CAboutDlg : public CDialog {&,a)h7&
{ !7P 1%/
public: \y"!`.E7\d
CAboutDlg(); r,!7TuBl
// Dialog Data B&+V %~/
//{{AFX_DATA(CAboutDlg) OjJKloy'
enum { IDD = IDD_ABOUTBOX }; 8L9xP'[^
//}}AFX_DATA #/MUiV
// ClassWizard generated virtual function overrides p4bQCI
//{{AFX_VIRTUAL(CAboutDlg) &5)Kg%r
protected: srw5&s(3X
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <dLdSEw
//}}AFX_VIRTUAL +\?#8U/k
// Implementation z2A7:[
protected: `.>2h}op
//{{AFX_MSG(CAboutDlg) n,bZj<3t
//}}AFX_MSG Gdi1lYu6V
DECLARE_MESSAGE_MAP() IM7k\
}; m .le' &
6Z\[{S];
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $._p !, <
{ ;.'2ZNt2
//{{AFX_DATA_INIT(CAboutDlg) v%VCFJ
//}}AFX_DATA_INIT /E@LnKe
} kG:uXbUI'
v@&&5J|
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ijw'7d|,
{ 0jro0f'
CDialog::DoDataExchange(pDX); kQRNVdiz
//{{AFX_DATA_MAP(CAboutDlg) zQV$!%qR
//}}AFX_DATA_MAP *.8@hPy
} /g< T)$2
JLp.bxx
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e(@ YBQ/Z
//{{AFX_MSG_MAP(CAboutDlg) ahU\(=
// No message handlers !6'j
W!
//}}AFX_MSG_MAP bP`yLz
END_MESSAGE_MAP() .fk!~8b[Q+
Ha)eeE$
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) bu1O<*
: CDialog(CCaptureDlg::IDD, pParent) MR:Co4(
{ Q
Bc\=}
//{{AFX_DATA_INIT(CCaptureDlg) DO'$J9;*
m_bControl = FALSE; oQBfDD0
m_bAlt = FALSE; f5IO<(:E^
m_bShift = FALSE; 5#!pwjt~7
m_Path = _T("c:\\"); !E'jd72O
m_Number = _T("0 picture captured."); _1VtVfiZ{
nCount=0; d/k&f5
bRegistered=FALSE; JVD#wwic
bTray=FALSE; B-
N
//}}AFX_DATA_INIT AA:Ch?
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Z f4Xt
Yn
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "i<i.6|
} Jk!}z+X'A
T_lexX[\
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) wv|:-8V
{ 4(B{-cK
CDialog::DoDataExchange(pDX); -\:pbR
//{{AFX_DATA_MAP(CCaptureDlg) .Vj;[p8
DDX_Control(pDX, IDC_KEY, m_Key); 3+;]dqZ
DDX_Check(pDX, IDC_CONTROL, m_bControl); v<,?%(g)7
DDX_Check(pDX, IDC_ALT, m_bAlt); qY]IX9'kV
DDX_Check(pDX, IDC_SHIFT, m_bShift); cxFfAk\,en
DDX_Text(pDX, IDC_PATH, m_Path); {a- p/\U
DDX_Text(pDX, IDC_NUMBER, m_Number); M;ac U~J
//}}AFX_DATA_MAP *`>(K&
} U<|kA(5
r5xu#%hgp;
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r]iec{ ^
//{{AFX_MSG_MAP(CCaptureDlg) _'JKPD[
ON_WM_SYSCOMMAND() iqig~fjK~
ON_WM_PAINT() U{gJn#e/.
ON_WM_QUERYDRAGICON() ]7}2"?J4v
ON_BN_CLICKED(ID_ABOUT, OnAbout) ]xBQ7Xqf|
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^EdY:6NJ=A
ON_BN_CLICKED(ID_CHANGE, OnChange) pP;GDW4
//}}AFX_MSG_MAP D:sQHJ.y
END_MESSAGE_MAP() &]iX>m.
o
/AEp)8
BOOL CCaptureDlg::OnInitDialog() qiV#T+\
{ 7Q7z6p/\v
CDialog::OnInitDialog(); ZY-W~p1:G
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,~w)~fMb8
ASSERT(IDM_ABOUTBOX < 0xF000); n qg=I
CMenu* pSysMenu = GetSystemMenu(FALSE); *q{/`Z{wy
if (pSysMenu != NULL) 9]r6V
{ ymT&[+V
CString strAboutMenu; &ok2Xw
strAboutMenu.LoadString(IDS_ABOUTBOX); LGGC=;{}
if (!strAboutMenu.IsEmpty()) :PuJF`k
{ tRZCOEo4
pSysMenu->AppendMenu(MF_SEPARATOR); EtK,C~C}8
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W!
v8'T
} H.qp~-n
} =ltT6of@o
SetIcon(m_hIcon, TRUE); // Set big icon ]e@'9`G-'
SetIcon(m_hIcon, FALSE); // Set small icon P(8zJk6h),
m_Key.SetCurSel(0); *D!$gfa
RegisterHotkey(); N%'=el4L
CMenu* pMenu=GetSystemMenu(FALSE); *aT3L#0(
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'z0@|a
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); LRW7_XYz
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (?Fz{
return TRUE; // return TRUE unless you set the focus to a control yxh8sAZ
} O+A/thI%*S
TXD\i Dq
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V4ml& D
{ 6;i]v|M-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4<CHwIRHY
{ %|bqL3)a_
CAboutDlg dlgAbout; U@x5cw:
dlgAbout.DoModal(); D'2&'7-sm\
} 48nZ
H=(Eh
else ,Ua`BWF
{ l'n"iQ!G
CDialog::OnSysCommand(nID, lParam); 5rK7nLb
} 1nhC! jDD
} 4zX@TI>j
*6=2UJcJ
void CCaptureDlg::OnPaint() ,{MA90!
{ `O ?61YUQH
if (IsIconic()) A I}29L3C
{ !%>p;H%0
CPaintDC dc(this); // device context for painting PB*mD7"
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /co^swz
// Center icon in client rectangle CKeT%3
int cxIcon = GetSystemMetrics(SM_CXICON); '+LC.l M
int cyIcon = GetSystemMetrics(SM_CYICON); Xn^gxOPM
CRect rect; ZG+8kt!w
GetClientRect(&rect); }t#uSz^
int x = (rect.Width() - cxIcon + 1) / 2; FWcE\;%yVg
int y = (rect.Height() - cyIcon + 1) / 2; >/k[6r5
// Draw the icon gBGUGjVj
dc.DrawIcon(x, y, m_hIcon); ^cB83%<Z
} :t+XW`eQR:
else MgyV{`
{ AAUFX/}8P
CDialog::OnPaint(); A
J<Sa=
} 6 Ty;m>j
} `3m7b!0k
J24<X9b
HCURSOR CCaptureDlg::OnQueryDragIcon() aEBQx
{ *f{\ze@5=
return (HCURSOR) m_hIcon; 4/e|N#1`;[
} #e:cB' f
\7o&'zEw
void CCaptureDlg::OnCancel() 9}LcJ
{ {?yZdL:m)
if(bTray) ZT;$aNy
DeleteIcon(); },zP,y:cH
CDialog::OnCancel(); 31v0V:j
} tjYqdbA)
*\><MXx
void CCaptureDlg::OnAbout() %>u(UmFO
{ >qkZn7C
CAboutDlg dlg; 3BHPD;U
dlg.DoModal(); 0<Q['l4Ar
} Q |,(C0<G
1h_TG.YL9>
void CCaptureDlg::OnBrowse() MHNuA,cz
{ 91'i7&~xdG
CString str; KG7 ~)g
BROWSEINFO bi; +ve S~
char name[MAX_PATH]; d^AXhQjQN-
ZeroMemory(&bi,sizeof(BROWSEINFO)); \>,[5|GU
bi.hwndOwner=GetSafeHwnd(); &p|+K
XIf
bi.pszDisplayName=name; tP/0_^m
bi.lpszTitle="Select folder"; b?S,%
bi.ulFlags=BIF_RETURNONLYFSDIRS; *l\wl @{
LPITEMIDLIST idl=SHBrowseForFolder(&bi); OI:G~Wg
if(idl==NULL) ?Vg251-H
return; jNRR=0
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); RN2^=$'.
str.ReleaseBuffer(); Itaq4 ^CE
m_Path=str; Y~vyCU5nWR
if(str.GetAt(str.GetLength()-1)!='\\') CWF(OMA
m_Path+="\\"; UqHk2h-
UpdateData(FALSE); x~3N})T5
} ;\1/4;m
hc#LniR3$
void CCaptureDlg::SaveBmp() nX
4WlH
{ REqQJ7a/
CDC dc; NPc@;g]d"
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ePF)wl;m
CBitmap bm; oN3DM;
int Width=GetSystemMetrics(SM_CXSCREEN); "&!7wH ,A
int Height=GetSystemMetrics(SM_CYSCREEN); }XHB7,
bm.CreateCompatibleBitmap(&dc,Width,Height); !j8.JP}!)
CDC tdc; j~DTvWg<Jl
tdc.CreateCompatibleDC(&dc); ]k0Pe;<
CBitmap*pOld=tdc.SelectObject(&bm); YO&=fd*
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Bgw=((p
tdc.SelectObject(pOld); _"nzo4e0
BITMAP btm; 3(?V!y{@
bm.GetBitmap(&btm); S)`%clN}J
DWORD size=btm.bmWidthBytes*btm.bmHeight; B8J_^kd
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7T7
A[A\
BITMAPINFOHEADER bih; l=+hs
bih.biBitCount=btm.bmBitsPixel; aYy+iP'$
bih.biClrImportant=0; ~1xfE C/
bih.biClrUsed=0; (x)}k&B;
bih.biCompression=0; <V?csx/eRd
bih.biHeight=btm.bmHeight; @-B)a Z
bih.biPlanes=1; al#BfcZW
bih.biSize=sizeof(BITMAPINFOHEADER); sn>2dRW{
bih.biSizeImage=size; R9+0ZoS
bih.biWidth=btm.bmWidth; K+WbxovXU
bih.biXPelsPerMeter=0; w8(8n&5
bih.biYPelsPerMeter=0; jg)+]r/hS
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3:H[S_q
static int filecount=0; Mk=M)d`
CString name; r1pj-
name.Format("pict%04d.bmp",filecount++); {Sl#z}@s
name=m_Path+name; w^BF.Nu
BITMAPFILEHEADER bfh; ML:Zm~A1U
bfh.bfReserved1=bfh.bfReserved2=0; $G UCVxs
bfh.bfType=((WORD)('M'<< 8)|'B'); +)J;4B
bfh.bfSize=54+size; D^m`&asC
bfh.bfOffBits=54; .{\lbI
CFile bf; nr*nX
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yzH(\ x
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3haR/YN
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); )~>
C1<
bf.WriteHuge(lpData,size); d2~*fHx_!
bf.Close(); =qWcw7!"
nCount++; A-6><X's6
} ./7*<W:
GlobalFreePtr(lpData); P0 4Q_A
if(nCount==1) [{&GMc
m_Number.Format("%d picture captured.",nCount); Fy6(N{hql
else -e2f8PV?3
m_Number.Format("%d pictures captured.",nCount); 6y0CEly>3#
UpdateData(FALSE); Cf~vT"
} ffH]`N
J]AkWEiCJ
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J=l\t7w
{ *#y9 Pve
if(pMsg -> message == WM_KEYDOWN) f*%Y]XL;%
{ TWU[/>K
if(pMsg -> wParam == VK_ESCAPE) +hZ{/
return TRUE; qpEK36Js
if(pMsg -> wParam == VK_RETURN) XJSI/jpa@
return TRUE; &mPR[{
} ;#/Uo8
return CDialog::PreTranslateMessage(pMsg); L\cbY6b
} !_P-?u
#{8t
?v l
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7QXp\<7
{ [Dq@(Q s'
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ lWyg_YO@
SaveBmp(); }+/F?_I=
%
return FALSE; R9q9cBi3
} y 1I(^<qO=
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8
*Y(wqH
CMenu pop; HKXtS>7d
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0Yo(pW,k
CMenu*pMenu=pop.GetSubMenu(0); hY(q@_s
pMenu->SetDefaultItem(ID_EXITICON); #qcF2&a%
CPoint pt; c,,(s{1
GetCursorPos(&pt); -s_=4U,
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zcE`.)y
if(id==ID_EXITICON) 3vc2t6S%*
DeleteIcon(); )b=m|A GX
else if(id==ID_EXIT) uQmtd
OnCancel(); J|uSj/8
return FALSE; qX"m"ko
} eZbT;
LRESULT res= CDialog::WindowProc(message, wParam, lParam); By;{Y[@rS
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .
g8WMm
AddIcon(); zI&).
return res; k:yrh:JhB
} C"cBlru8B
.4%6_`E
void CCaptureDlg::AddIcon() 3E$h
W
{ y,F|L?dIq
NOTIFYICONDATA data; /ReOf<%B
data.cbSize=sizeof(NOTIFYICONDATA); (GJX[$@
CString tip; 6DxT(VU}
tip.LoadString(IDS_ICONTIP); cs-dvpMZ
data.hIcon=GetIcon(0); [ApAd
data.hWnd=GetSafeHwnd(); @wTRoMHPQ
strcpy(data.szTip,tip); 2tMa4L%@C
data.uCallbackMessage=IDM_SHELL; ~&7 *<`7{
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PBY;SG~
data.uID=98; 0ZJN<AzbA
Shell_NotifyIcon(NIM_ADD,&data); V }wh
ShowWindow(SW_HIDE); p9Y`_g`
bTray=TRUE; `]$H\gNI[8
} btDPP k'
0N`'a?x
void CCaptureDlg::DeleteIcon() rhH !-`m
{ Sd?+j;/"
NOTIFYICONDATA data; cS;O]>/5
data.cbSize=sizeof(NOTIFYICONDATA); feA(Rj
data.hWnd=GetSafeHwnd(); +V,Ld&r
data.uID=98; pP^"p"<s
Shell_NotifyIcon(NIM_DELETE,&data); <=gf|(
ShowWindow(SW_SHOW); |n~Vpy
SetForegroundWindow(); K-6+fgeB
ShowWindow(SW_SHOWNORMAL); rrc>O*>{i
bTray=FALSE; *<l9d
} #(dERET*
F m$;p6&j
void CCaptureDlg::OnChange() tK LAA+Z
{ be(p13&od
RegisterHotkey(); |>Wi5h{6X
} Y6ORI
M^?=!!US^
BOOL CCaptureDlg::RegisterHotkey() qy,X#y'FuE
{ VK/i5yT5N
UpdateData(); -z?O^:e#x
UCHAR mask=0; U\`yLsKvH`
UCHAR key=0; q,fk@GI'2
if(m_bControl) =G-u "QJ6
mask|=4; E|BiK
if(m_bAlt) eSA%:Is.
mask|=2; #e5*Dr8
if(m_bShift) nH(Hk%~
mask|=1; 2\L}Ka|v
key=Key_Table[m_Key.GetCurSel()]; fS- 31<?
if(bRegistered){ h@D</2>
DeleteHotkey(GetSafeHwnd(),cKey,cMask); .ta*M{t
bRegistered=FALSE; G{{Or
} pNzpT!}H>
cMask=mask; xx
EcmS#>
cKey=key; HHaerc
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); O\[Td
return bRegistered; BGZvgMxLJ
} /u N3"m5i
7).zed^
四、小结 2apQ4)6#[H
Dwi[aC+k
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。