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:
pe|X@o
0|g[o:;fl_ 一、实现方法
SOVjEo4'3 }N?g| 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:
wHx}U M" :^n*V6.4 #pragma data_seg("shareddata")
C(G(^_6 HHOOK hHook =NULL; //钩子句柄
6N"m?g*Z
d UINT nHookCount =0; //挂接的程序数目
rwy+~ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
H4t)+(:D' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Zr=ib static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
dUIqD l static int KeyCount =0;
8qn 9| static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
xcst<= #pragma data_seg()
Us'Cs+5XcG 4S tjj!ew 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。
0; 7#ji
Z a!
gbt 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:
`19qq] 6
jmrD BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
yE#g5V& cKey,UCHAR cMask)
4sTMgBzw {
Tr~sieL BOOL bAdded=FALSE;
rWA6XDM7 for(int index=0;index<MAX_KEY;index++){
`M:DZNy, if(hCallWnd[index]==0){
42&v% ;R hCallWnd[index]=hWnd;
<Z},A-\S* HotKey[index]=cKey;
J,??x0GDx, HotKeyMask[index]=cMask;
+p9-
.YM bAdded=TRUE;
I_ONbJ9] KeyCount++;
vv+km + break;
}MP>]8Aq }
]Ko^G_Rm
}
_BbvhWN&+ return bAdded;
n+2%tW }
P$_&
//删除热键
K4:
$= BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+~N!9eMc {
=~&VdPZ BOOL bRemoved=FALSE;
)>V?+L5M for(int index=0;index<MAX_KEY;index++){
9UV9h_.x if(hCallWnd[index]==hWnd){
U9
#w if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=-w;zx hCallWnd[index]=NULL;
"tUwo(K[ HotKey[index]=0;
hUh+JW HotKeyMask[index]=0;
UbO4%YHt bRemoved=TRUE;
5Tedo~v KeyCount--;
vwmBUix break;
++b$E&lYU }
|#k@U6`SG }
h$>wv` }
PQ$sOK|/ return bRemoved;
Nar>FR7ut }
lbTV$A V4|uas{0I: <YH=3[ DLL中的钩子函数如下:
HJIC<U \|.7-X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Tg0CE60"
{
yrnv!moc%t BOOL bProcessed=FALSE;
$#e1SS32 if(HC_ACTION==nCode)
0]B(a {
?^}_j
vT if((lParam&0xc0000000)==0xc0000000){// 有键松开
7b, (\Fm switch(wParam)
ZIDbqQu {
i)MEK#{ case VK_MENU:
FH8k'Hxg MaskBits&=~ALTBIT;
2Q@Y^t
break;
y \D=Z
N@ case VK_CONTROL:
0mTr-`s MaskBits&=~CTRLBIT;
xR?V,uV'$& break;
Od##U6e` case VK_SHIFT:
&l m# MaskBits&=~SHIFTBIT;
)"|||\Iv break;
|0g{"}% default: //judge the key and send message
2z\e\I break;
,$N#Us(Wa }
-_em%o3XC for(int index=0;index<MAX_KEY;index++){
dEp7{jY1O if(hCallWnd[index]==NULL)
pvF-Y9Xb continue;
vcv CD7MD if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
BhkoSkr {
q9]IIv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/&^W#U$4 bProcessed=TRUE;
V
kjuyK }
d|lpec }
T.ML$"f }
5Sva}9H else if((lParam&0xc000ffff)==1){ //有键按下
36vgX=} switch(wParam)
n<7u>;SJQ {
nS9wb1Zl case VK_MENU:
sI LSey5` MaskBits|=ALTBIT;
]{GDS! ) break;
#+k*1Jg case VK_CONTROL:
@1:0h9% MaskBits|=CTRLBIT;
Z6Fp\aI8@ break;
!q'
4D!I case VK_SHIFT:
V 1/p_)A MaskBits|=SHIFTBIT;
-1u9t4+` break;
H43MoC default: //judge the key and send message
Gh\q^?} break;
=a}b+(R }
a`!@+6yC for(int index=0;index<MAX_KEY;index++){
t e,[f if(hCallWnd[index]==NULL)
Y`BRh9Sa continue;
(V?: ] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
z~{&}Em ~ {
=Vw
5q},3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
69G`2_eKCp bProcessed=TRUE;
Ba'LRz }
`$TRleSi }
)Xtnk }
3\:y8| if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
'hqBo| for(int index=0;index<MAX_KEY;index++){
,xfO;yd if(hCallWnd[index]==NULL)
B*3Y!! continue;
gckI.[!b if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
IzLQhDJ1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
X3%Ic`Lq# //lParam的意义可看MSDN中WM_KEYDOWN部分
qfoD }
{d<;BLA }
T'H::^9:E }
n, i'Dhzk return CallNextHookEx( hHook, nCode, wParam, lParam );
N?P%-/7 }
/i]y$^ ,9D+brm 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:
Qf $|_&| x@Hd^xH` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.2)
=vf'd BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
yR;{ Y>+y(ck 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
x[3A+ nh>K`+>co LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
\S~Vx!9w {
XB59Vm0E= if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
!\Xm!I8 {
T r0B[QF //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
2L?!tBw?1 SaveBmp();
i0jBZW"_1$ return FALSE;
Bi,;lR5
}
\ZU1Jb1c …… //其它处理及默认处理
umi5Wb< }
s?R2B)a h vka{LD cWyW~Ek 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。
',^+bgs5 Uyx!E4pl( 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。
~@.%m"<. r.ZF_^y}+ 二、编程步骤
jhbonuV_ qqrq11W 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";
svf|\p>]H !V2/A1? 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
sZGj"_-Hzu <Z}SKR"U% 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;
XxIHoX& 3jB$2: # 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
{ FZ=olZ 3psU?8( 5、 添加代码,编译运行程序。
3I\n_V< 7\FXz'hA 三、程序代码
,JU@|` G)v
#+4 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
L@`ouQ"sa #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
kVK/9dy-F #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
4SPy28<f #if _MSC_VER > 1000
b306&ZVEk #pragma once
6`vC1PK^ #endif // _MSC_VER > 1000
M" ^PW,k #ifndef __AFXWIN_H__
EnOU?D #error include 'stdafx.h' before including this file for PCH
ib{-A& #endif
N_:qRpp6i #include "resource.h" // main symbols
bwiPS1+); class CHookApp : public CWinApp
EBz}|GY; {
iY"l}.7) public:
\%^%wXfp CHookApp();
!*6CWV0 // Overrides
`;%]'F0` // ClassWizard generated virtual function overrides
sVG(N.y //{{AFX_VIRTUAL(CHookApp)
=] *.ZH#h public:
mU}F!J#6 virtual BOOL InitInstance();
pvmC$n^zc virtual int ExitInstance();
F1L:,.e` //}}AFX_VIRTUAL
8JmFi //{{AFX_MSG(CHookApp)
rV08ad // NOTE - the ClassWizard will add and remove member functions here.
M%jPH // DO NOT EDIT what you see in these blocks of generated code !
}!IL]0q //}}AFX_MSG
]Oq[gBL"A DECLARE_MESSAGE_MAP()
orOt>5}b< };
y ]?V~% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
5j~$Mj` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
NaX BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?QE,;QtpK BOOL InitHotkey();
;2B{ 9{ BOOL UnInit();
@E:,lA #endif
g=I8@m E@7J:|.)R //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/cU<hApK #include "stdafx.h"
Um&(&?Xf #include "hook.h"
J9~g|5 #include <windowsx.h>
HRB<Y
mP@ #ifdef _DEBUG
"
Hd|7F'u= #define new DEBUG_NEW
YnLErJ #undef THIS_FILE
[l,Ei? static char THIS_FILE[] = __FILE__;
3}e%[AKh #endif
ai0XL}!+ #define MAX_KEY 100
&x3VCsC\| #define CTRLBIT 0x04
w^t/9Nasi #define ALTBIT 0x02
lRXK\xIP , #define SHIFTBIT 0x01
8By|@LO #pragma data_seg("shareddata")
eq UME HHOOK hHook =NULL;
h:9Zt0, UINT nHookCount =0;
_%QhOY5tv" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
6F e34n]m static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
}iuWAFZbGS static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
j_Yp>=+[ static int KeyCount =0;
I_RsYw static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
fkac_X$7 #pragma data_seg()
o}ZdTf= HINSTANCE hins;
`]%|f void VerifyWindow();
i>(e}<i BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
kh`"WN Nt //{{AFX_MSG_MAP(CHookApp)
eH{[C* // NOTE - the ClassWizard will add and remove mapping macros here.
8YbE`32 // DO NOT EDIT what you see in these blocks of generated code!
yj\Nkh //}}AFX_MSG_MAP
c"[cNZo END_MESSAGE_MAP()
:Y [LN z*-2.}&U< CHookApp::CHookApp()
A{A\RSZ0 {
<_7*67{ // TODO: add construction code here,
P'_H/r/# // Place all significant initialization in InitInstance
0\e IQp }
AJ=qn a ?"g! CHookApp theApp;
+llR204 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!jTcsN% {
S_Wrw z BOOL bProcessed=FALSE;
8SGo9[U2 if(HC_ACTION==nCode)
&G-!qxe {
x@[rms
if((lParam&0xc0000000)==0xc0000000){// Key up
_fKou2$yz switch(wParam)
xoN3 {
i*Z"Me case VK_MENU:
<*qnY7c&N; MaskBits&=~ALTBIT;
#?S^kM-0 break;
B8}Nvz
/ case VK_CONTROL:
%rv7Jy MaskBits&=~CTRLBIT;
@<elq'2 break;
Fx2bwut.K case VK_SHIFT:
yPal<c MaskBits&=~SHIFTBIT;
3qf
Ym}d break;
U[ 0=L`0e default: //judge the key and send message
I "A_b}~*} break;
H5Io{B%= }
e7sp =I, for(int index=0;index<MAX_KEY;index++){
<P=twT;P if(hCallWnd[index]==NULL)
qHrc9fB continue;
R21b!Pd\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Kkm>e{0)AY {
T:=lz:}I SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
fSokm4]vg bProcessed=TRUE;
E
S // }
s*-n^o- }
XMxSQ B1 }
H<PtAYFS else if((lParam&0xc000ffff)==1){ //Key down
0|{u{w@!` switch(wParam)
@fl-3q {
~
Q. 7VDz case VK_MENU:
qm"rY\: MaskBits|=ALTBIT;
Q|#W#LV,K break;
,Vt/(x- case VK_CONTROL:
1ng!G 7g MaskBits|=CTRLBIT;
x$6^R q>2 break;
vzim<;i case VK_SHIFT:
E2Q[ZoVS MaskBits|=SHIFTBIT;
\nPEyw,U break;
~Vr.J}]J default: //judge the key and send message
)p<ExMIxd break;
gaZu;t2u }
-;^j:L{ for(int index=0;index<MAX_KEY;index++)
n$$SNWgM {
tp6 3@L|Q if(hCallWnd[index]==NULL)
d?A
0MKnl continue;
YoBDvV":@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*%%g{
3$ {
VHIOwzC SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
w5Y04J bProcessed=TRUE;
7/I, HxXp! }
3h$6t7=C }
<
HVl(O }
]~'5\58sP if(!bProcessed){
E87Ww,z8 for(int index=0;index<MAX_KEY;index++){
tMf}
if(hCallWnd[index]==NULL)
6ZP(E^. continue;
LG9+y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
l1BtI_7p SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
W\d{a(* }
=THpdtL }
J IUx }
JB<Sl4 return CallNextHookEx( hHook, nCode, wParam, lParam );
]:XoRyIZ1[ }
,$s8GAmq 9\_eK,*B BOOL InitHotkey()
;$.J3! {
Egg=yF>T if(hHook!=NULL){
m
qMHL2~ nHookCount++;
A%KDiIA return TRUE;
Z2qW\E^_r }
/5(Yy} else
%A1o.{H hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
TO]@
Zu1 if(hHook!=NULL)
~*z% e*EL nHookCount++;
gOSJM1Mr3 return (hHook!=NULL);
ME46V6[LX] }
QdF5Cwf4 BOOL UnInit()
Q(wx nm {
a&/#X9/ if(nHookCount>1){
VVac: nHookCount--;
d3ZdB4L return TRUE;
v%+:/m1 }
Br1&8L-|% BOOL unhooked = UnhookWindowsHookEx(hHook);
O}-jCW;K if(unhooked==TRUE){
zzTfYf) nHookCount=0;
&Sw%<N*r hHook=NULL;
u0|8Tgf }
IzikDc10 return unhooked;
)dbB=OZ }
{< )1q ; "p_J8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
oM2l-[- {
Wh+{mvu# BOOL bAdded=FALSE;
I&}L*Z?` for(int index=0;index<MAX_KEY;index++){
8 OY 3A if(hCallWnd[index]==0){
]zE;Tw.S hCallWnd[index]=hWnd;
>,gg5<F-E HotKey[index]=cKey;
x@P y>f2 HotKeyMask[index]=cMask;
$PTP/^ bAdded=TRUE;
m0ER@BXRn KeyCount++;
{o_X`rgrL break;
!h"Kq>9T }
,J,/."Y }
1+szG1U= return bAdded;
*H"B _3<n }
H?<N.Dq >`Y.+4mE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
^Cu\VV {
Aw$x;3y BOOL bRemoved=FALSE;
zi|+HM for(int index=0;index<MAX_KEY;index++){
F
U_jGwD if(hCallWnd[index]==hWnd){
`q}I"iS if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
zM bN;tu hCallWnd[index]=NULL;
i
UCXAWP HotKey[index]=0;
7Ri46Tkt HotKeyMask[index]=0;
Xe6w| bRemoved=TRUE;
~
{E'@MU KeyCount--;
wvO|UP H\ break;
MLw7}[ }
l~c@^! }
sGyeb5c }
b LlKe50 return bRemoved;
Sg&UagBj }
^o^H3m 6t>.[Y"v void VerifyWindow()
D>/0v8
{
LLk(l#K* for(int i=0;i<MAX_KEY;i++){
hL/)|N~ if(hCallWnd
!=NULL){ K&POyOvT
if(!IsWindow(hCallWnd)){ e-:yb^
hCallWnd=NULL; 7S '%
E
HotKey=0; W5EDVPur
HotKeyMask=0; mg^I=kpk
KeyCount--; ~zHjMo2
} S^-DK~Xt4
} 0Vlk;fIh
} aC$B2
} aZ2!i
]NUl9t*N4
BOOL CHookApp::InitInstance() /1"(cQ%?
{ {G U&a
AFX_MANAGE_STATE(AfxGetStaticModuleState()); .>=(' -
hins=AfxGetInstanceHandle(); <e Th
InitHotkey(); 7&t-pv92*
return CWinApp::InitInstance(); I8wXuIN_
} {@eJtF+2
1C<uz29
int CHookApp::ExitInstance() u[@l~gwL
{ Eo{"9j\
VerifyWindow(); 3.|S
UnInit(); F~T]u2qt
return CWinApp::ExitInstance(); }Mst jm
} }#L^! \V}
*@Lp`thq
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p`b"-[93
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 61SlVec*o8
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ o|>'h$
#if _MSC_VER > 1000 -e_hrCW&9
#pragma once 3kw,(-'1
#endif // _MSC_VER > 1000 KC/=TSSXd.
&M46&^Jho
class CCaptureDlg : public CDialog }Ga\wV
{ gRCdY8GH
// Construction 6g|*`x{
public: d ^^bke$~
BOOL bTray; GGNvu)"
BOOL bRegistered; Bzkoo J
BOOL RegisterHotkey();
3L<wQ(
UCHAR cKey; 7op`s5i
UCHAR cMask; dYT%
void DeleteIcon(); >pU$wq|i
void AddIcon(); lpQSup
UINT nCount; k3u"A_"c
void SaveBmp(); G0/4JSH
CCaptureDlg(CWnd* pParent = NULL); // standard constructor T ?$:'XJ
// Dialog Data 5]NqRI^0
//{{AFX_DATA(CCaptureDlg) {9?Jj A
enum { IDD = IDD_CAPTURE_DIALOG }; uD}2<$PP
CComboBox m_Key; fmQ_P.c
BOOL m_bControl; BcL{se9<
BOOL m_bAlt; ~<O7$~
BOOL m_bShift; :yRo3c
CString m_Path; KV]X@7`@
CString m_Number; `7[EKOJ3g
//}}AFX_DATA 5"CZh.J
// ClassWizard generated virtual function overrides igIRSN}h
//{{AFX_VIRTUAL(CCaptureDlg) 3N dq>
public:
8cU}I4|
virtual BOOL PreTranslateMessage(MSG* pMsg); y+X2Pl
protected: M.x=<:upp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gnFr}L&j
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C9~52+S
//}}AFX_VIRTUAL ",^Mxm{
// Implementation =T-&j60
protected: |uX,5Q#6
HICON m_hIcon; lt
^GvWg
// Generated message map functions FoNSM$x
//{{AFX_MSG(CCaptureDlg) 2/?`J
virtual BOOL OnInitDialog(); mR&H9NG
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c#|raXGT
afx_msg void OnPaint(); ;1:Js0=;H
afx_msg HCURSOR OnQueryDragIcon(); <D:.(AUeO
virtual void OnCancel(); q|j2MV5#g
afx_msg void OnAbout(); (a[y1{DLy
afx_msg void OnBrowse(); _kj wFq
afx_msg void OnChange(); ZX>AE3wk
//}}AFX_MSG S4'
DECLARE_MESSAGE_MAP() T;L>;E>B
}; (MR_^t
#endif zfc'=ODX
eIz<)-7:
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :ctu5{"UJ
#include "stdafx.h" _oHNkKQ
#include "Capture.h" [#l*_0
#include "CaptureDlg.h" MXw hxk#E
#include <windowsx.h> Q?nN!eT
#pragma comment(lib,"hook.lib") U*i{5/$
#ifdef _DEBUG ;*Ivn@L
#define new DEBUG_NEW oE+R3[D?r
#undef THIS_FILE {l>yi
static char THIS_FILE[] = __FILE__; B.dH(um
#endif .ni_p 6!
#define IDM_SHELL WM_USER+1 4(|cG7>9-
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2>cGH7EBD
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5MN8D COF
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +?:7O=Y
class CAboutDlg : public CDialog z`!XhU
{ JBi*P.79^
public: V#XppYU
CAboutDlg(); ,{BaePMp
// Dialog Data b\3Oyp>
//{{AFX_DATA(CAboutDlg) ?98("T|y;
enum { IDD = IDD_ABOUTBOX }; ~rDZ?~%
//}}AFX_DATA lwrCpD.
// ClassWizard generated virtual function overrides ,quoRan
//{{AFX_VIRTUAL(CAboutDlg) L;*ljZ^c
protected: |.F$G<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \MbB#
//}}AFX_VIRTUAL TM_/`a2}
// Implementation >+JqA7K
protected: ?\t#1"d
//{{AFX_MSG(CAboutDlg) %/|9@e r
//}}AFX_MSG eO?p*"p" F
DECLARE_MESSAGE_MAP() }
ud0&Oe{
}; kMb}1J0i"
h-G)o[MA
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #
WAZ9,t
{ YE|SKx@
//{{AFX_DATA_INIT(CAboutDlg) Tw""}|] g
//}}AFX_DATA_INIT G&i!Hs
} (#Wu#F1;
/W>iJfx
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $oj:e?8N
{ PmKeF}
CDialog::DoDataExchange(pDX); %>~sJ0
//{{AFX_DATA_MAP(CAboutDlg) 4kBaB
//}}AFX_DATA_MAP i+p^ ^t\
} mS~o?q-n
X$ s:>[H
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t=Xv;=daB
//{{AFX_MSG_MAP(CAboutDlg) SZ,YS
4M
// No message handlers E%rk[wI
//}}AFX_MSG_MAP ;$smH=I
END_MESSAGE_MAP() d8[J@M53|T
L1cI`9
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \P.I)n`8 y
: CDialog(CCaptureDlg::IDD, pParent) X~lVVBO
{ :-/M?,Q"
//{{AFX_DATA_INIT(CCaptureDlg) t.7?
m_bControl = FALSE; BI3@|,._N
m_bAlt = FALSE; Lv|q
m_bShift = FALSE; N"]q='t
m_Path = _T("c:\\"); .NYbi@bk(<
m_Number = _T("0 picture captured."); -I&m:A$4*
nCount=0; a0D%k: k5
bRegistered=FALSE; D|e
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bTray=FALSE; k@/sn(x
//}}AFX_DATA_INIT FFu9&8Y
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,.kha8v
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CIb2J)qev
} ti
I.W
M luVx'
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) : cF[(i/k4
{ Dpl A?
CDialog::DoDataExchange(pDX); U<DZ:ds?T
//{{AFX_DATA_MAP(CCaptureDlg) Cj{1H([-
DDX_Control(pDX, IDC_KEY, m_Key); yXHUJgjl/
DDX_Check(pDX, IDC_CONTROL, m_bControl); KY51rw.
DDX_Check(pDX, IDC_ALT, m_bAlt); [n \2
DDX_Check(pDX, IDC_SHIFT, m_bShift); ]Q>.HH
DDX_Text(pDX, IDC_PATH, m_Path); m 8aITd8
DDX_Text(pDX, IDC_NUMBER, m_Number); [8T^@YN
//}}AFX_DATA_MAP :9QZPsL
} 2zs73:z
1Cgso`
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G#d{,3Gq1
//{{AFX_MSG_MAP(CCaptureDlg) Urr@a/7
ON_WM_SYSCOMMAND() ]sE?ezu
ON_WM_PAINT() "nw;NIp!
ON_WM_QUERYDRAGICON() b[o"7^H
ON_BN_CLICKED(ID_ABOUT, OnAbout) 6YGubH7%_
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6]W=nAD
ON_BN_CLICKED(ID_CHANGE, OnChange)
ll`>FcQ
//}}AFX_MSG_MAP uBNn6j
END_MESSAGE_MAP() 23RN}LUi
^eo|P~w
g
BOOL CCaptureDlg::OnInitDialog() 59"UL\3
{ 3|'>`!hb
CDialog::OnInitDialog(); X voo=
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vgfcCcZ_iZ
ASSERT(IDM_ABOUTBOX < 0xF000); VJickXA
CMenu* pSysMenu = GetSystemMenu(FALSE); {<R2UI5m5
if (pSysMenu != NULL) auK?](U
{ 'VzP};
CString strAboutMenu; q|!-0B@
strAboutMenu.LoadString(IDS_ABOUTBOX); e=B|==E10M
if (!strAboutMenu.IsEmpty()) 6L"%e!be6
{ qz0;p=$8Z
pSysMenu->AppendMenu(MF_SEPARATOR); Y]/%t{Y
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ,
udTvI
} }bdmomV
} W-?()dX{
SetIcon(m_hIcon, TRUE); // Set big icon ]6TATPIr
SetIcon(m_hIcon, FALSE); // Set small icon ms*(9l.hOK
m_Key.SetCurSel(0); I%sFqh>
RegisterHotkey(); U%q7Ai7
CMenu* pMenu=GetSystemMenu(FALSE); 0K`#>}W#X
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); y5?RVlKJ
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ji>o!
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); n%-R[vW
return TRUE; // return TRUE unless you set the focus to a control `(_s|-$
} KH(%?
mlJ!:WG
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5|o6v1bM
{ wr$M$i:
if ((nID & 0xFFF0) == IDM_ABOUTBOX) j4jTSLQ\
{ =g9*UzA"O
CAboutDlg dlgAbout; |wiqGzAr{
dlgAbout.DoModal(); $$Oey)*
} aMWmLpv4'
else zO ).T
M_
{ p i
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CDialog::OnSysCommand(nID, lParam); {^CY..3
A
} G6/p1xy>o:
} |iE50,
dQV;3^iUY
void CCaptureDlg::OnPaint() YQHw1
{ }<@b=_>S
if (IsIconic()) YKH\rN6X
{ QdL`|
CPaintDC dc(this); // device context for painting o0ifp=V
y
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ADDSCY=,
// Center icon in client rectangle ts\5uiB<%
int cxIcon = GetSystemMetrics(SM_CXICON); MZSy6v
int cyIcon = GetSystemMetrics(SM_CYICON); \;qW 3~
CRect rect; i;/5Y'KZ
GetClientRect(&rect); X*/ho
int x = (rect.Width() - cxIcon + 1) / 2; f&BY/ n,
int y = (rect.Height() - cyIcon + 1) / 2; Fl kcU
`j
// Draw the icon 9 7GV2]-M
dc.DrawIcon(x, y, m_hIcon); =t9\^RIx)?
} Cs9.&Y
else /fZeWU0W
{ jcuB
CDialog::OnPaint(); ^l9N48]|?
} 9
Vkb>yFX'
} Nl^;A><u
$ M`hh{ -
HCURSOR CCaptureDlg::OnQueryDragIcon() M?Dfu
.t
{ DI:]GED"=
return (HCURSOR) m_hIcon; NdMb)l)m
} _FH`pv
B8f8w)m
void CCaptureDlg::OnCancel() a%kQl^I4
{ +x0!*3q
if(bTray) L^}_~PO N5
DeleteIcon(); iII=;:p
CDialog::OnCancel(); )wC?T
} }& cu/o4
uJzG|$;
void CCaptureDlg::OnAbout() @ ;*Ksy@1O
{ Y$Zx,
CAboutDlg dlg; #Y*X<L
dlg.DoModal(); llcb~
} ?[@J8
f .Q\Z'S^
void CCaptureDlg::OnBrowse() AL9chYP}/
{ ~;l@|7wGz
CString str; ED=V8';D
BROWSEINFO bi; s}w{:Hk,x8
char name[MAX_PATH]; h2Ld[xvCu%
ZeroMemory(&bi,sizeof(BROWSEINFO)); )J2mM
bi.hwndOwner=GetSafeHwnd();
gbF+WE
bi.pszDisplayName=name; L2\#w<d
bi.lpszTitle="Select folder"; ]V^iN=(_5
bi.ulFlags=BIF_RETURNONLYFSDIRS; "I3@m%qv
LPITEMIDLIST idl=SHBrowseForFolder(&bi); $"+djI?E9
if(idl==NULL) B3We|oe !
return; rDm~h~u5
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1oR7iD^
str.ReleaseBuffer(); B<5R
m_Path=str; X{5vXT\/y
if(str.GetAt(str.GetLength()-1)!='\\') S\:P-&dC
m_Path+="\\"; ZP@
$Q%up
UpdateData(FALSE); wPQH(~k:
} cG[l!Z
0)Uce=t`
void CCaptureDlg::SaveBmp() (SpX w,:
{ 4{y)TZ
CDC dc; \UPjf]&
dc.CreateDC("DISPLAY",NULL,NULL,NULL); _Gn2o2T
CBitmap bm; Y~c|hfL
int Width=GetSystemMetrics(SM_CXSCREEN); )eUh=eW
int Height=GetSystemMetrics(SM_CYSCREEN); &XIt5<$~R
bm.CreateCompatibleBitmap(&dc,Width,Height); [w0QZyUn
CDC tdc; |XQIfW]A
tdc.CreateCompatibleDC(&dc); 'GNK "XA^
CBitmap*pOld=tdc.SelectObject(&bm); Bmr>n6|
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); uGwm
r
tdc.SelectObject(pOld); 6a[}'/
BITMAP btm; +O8%Hm
bm.GetBitmap(&btm); u_@f$
DWORD size=btm.bmWidthBytes*btm.bmHeight; !hJ+Lp_
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5eLtCsHz
BITMAPINFOHEADER bih; q
?|,O;?
bih.biBitCount=btm.bmBitsPixel; K'L^;z6
bih.biClrImportant=0; r+A{JHnN
bih.biClrUsed=0; Vc 1\i
bih.biCompression=0; 00(on28b
bih.biHeight=btm.bmHeight; cr%"$1sY;
bih.biPlanes=1; 5x5@t
:
bih.biSize=sizeof(BITMAPINFOHEADER); #eoome2Q
bih.biSizeImage=size; ]O]4z,n
bih.biWidth=btm.bmWidth; Px4)>/ z,
bih.biXPelsPerMeter=0; i6^twK)j
bih.biYPelsPerMeter=0; `g(Y*uCp
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); U;YC}r
static int filecount=0;
[$mHv,~
CString name; {#ZlM
name.Format("pict%04d.bmp",filecount++); *:Y%HAy*
name=m_Path+name; RSfQNc9Z
BITMAPFILEHEADER bfh; 2GP=&K/A
bfh.bfReserved1=bfh.bfReserved2=0; [)H&'5 +F
bfh.bfType=((WORD)('M'<< 8)|'B'); ,|3MG",@@h
bfh.bfSize=54+size; ^X=arTE
bfh.bfOffBits=54; &*##bA"!B
CFile bf; NSxoF3
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ PRx8I
.
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2<i!{;u$qL
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); '=39+*6?
bf.WriteHuge(lpData,size); I@T8Iv=
bf.Close(); Z_$%.
nCount++; Z-^LKe
} Y1OCLnK~
GlobalFreePtr(lpData); (7vF/7BZ|_
if(nCount==1) HHA<IZ#;,
m_Number.Format("%d picture captured.",nCount); urbp#G/>
else 51#_Vg
m_Number.Format("%d pictures captured.",nCount); vx1c,8
UpdateData(FALSE); '.on)Zd.
} Dt}JG6 S
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p,
h9D_
{ @:j}Jmg
if(pMsg -> message == WM_KEYDOWN) 0pK=o"^?@
{ MDnKX?Y
if(pMsg -> wParam == VK_ESCAPE) N nRD|A
return TRUE; Nkjza:f{
if(pMsg -> wParam == VK_RETURN) 6g2a[6G5
return TRUE; S'k_olx7
} I&2c&yO
return CDialog::PreTranslateMessage(pMsg); IshKH-
} 'KP@W9j
wrc,b{{[iM
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^&B@Uw5{
{ "7
4-4
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ dz:E?
SaveBmp(); {Bk[rCl
return FALSE; P60~V"/P
} >W%EmnLK
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ A}BVep@D
CMenu pop; +O"!qAiK
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); u7Y
WnD
CMenu*pMenu=pop.GetSubMenu(0); .~)q};Z
pMenu->SetDefaultItem(ID_EXITICON); O[\iE5+$
CPoint pt; |WQBDB`W
GetCursorPos(&pt); ]q;Emy
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @fHi\W2JG
if(id==ID_EXITICON) '<jyw
DeleteIcon(); u#Pa7_zBj]
else if(id==ID_EXIT) srr
:!5
OnCancel(); |v`AA?@{8
return FALSE; *U^6u/iH
} $3W;=Id=+
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _64A(U
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Za/-i"U
AddIcon(); 'vVQg
return res; bENdMH";
} bZ?v-fn\D,
+M./@U*g
void CCaptureDlg::AddIcon() _ q(ko/T
{ j:^#rFD4?
NOTIFYICONDATA data; 9`T)@Uj2n
data.cbSize=sizeof(NOTIFYICONDATA); bbtGXfI+SB
CString tip; 18)'c?^.
tip.LoadString(IDS_ICONTIP); 3]OE}[R
data.hIcon=GetIcon(0); Y4OPEo 5o
data.hWnd=GetSafeHwnd(); e{h<g>7
strcpy(data.szTip,tip); rDD:7*z
data.uCallbackMessage=IDM_SHELL; HeK/7IAqp
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;
Hu^1[#
data.uID=98; l\E%+?K+^
Shell_NotifyIcon(NIM_ADD,&data); ",p;Sd
ShowWindow(SW_HIDE); 0QBiC]9
bTray=TRUE; %r<rcY
} NC8t)
X7
0m7Y>0wC6T
void CCaptureDlg::DeleteIcon() 4{}FL
{ 9?A)n4b;
NOTIFYICONDATA data; ko5 @qNq
data.cbSize=sizeof(NOTIFYICONDATA); #Z}Rfk(~
data.hWnd=GetSafeHwnd(); )mI 05
data.uID=98; }Q)#[#e
Shell_NotifyIcon(NIM_DELETE,&data); ~t@cO.c
ShowWindow(SW_SHOW); \6S7T$$ 1m
SetForegroundWindow(); Km%]1X7T6
ShowWindow(SW_SHOWNORMAL); P!~MZ+7#&
bTray=FALSE; GSY(
} P]<4R:yb
<m!h&_eg
void CCaptureDlg::OnChange() tf=6\p
{ !!qK=V|>
RegisterHotkey(); 0v6)t.]s
} 4qN{n#{+]
Rh3eLt~|(
BOOL CCaptureDlg::RegisterHotkey() }elc `jj
{ ~<P
0]ju
UpdateData(); a[v0%W ]u
UCHAR mask=0; .0p0_f=
UCHAR key=0; ZWii)0'PV
if(m_bControl) t#yk->,
mask|=4; O1rvaOlr
if(m_bAlt) ~Xw"}S5
mask|=2; -B>++r2A^
if(m_bShift) 214Ml0/%
mask|=1; Zvhsyz|
key=Key_Table[m_Key.GetCurSel()]; )r';lGh2#
if(bRegistered){ `^91%f
DeleteHotkey(GetSafeHwnd(),cKey,cMask); A]y`7jJ
bRegistered=FALSE; T\:4qETQF]
} 7@C<oy_bb
cMask=mask; x9NEFtqjm
cKey=key; ".f ;+wH
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xpNH?#&
return bRegistered; u=Fv2
} +QB"8-
IWBX'|}K
四、小结 > pgX^
jy7\+i
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。