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:
_}Gs9sHr0K
1?+)T%" 一、实现方法
(K"t</] I@a7!ugU65 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:
F0NNS!WP7^ b!37:V\#} #pragma data_seg("shareddata")
X>jwjRK
$ HHOOK hHook =NULL; //钩子句柄
q33!X!br UINT nHookCount =0; //挂接的程序数目
6a`_i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
kLY9#p=X static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
\t&6$"n(B6 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
I|[aa$G static int KeyCount =0;
?yz} static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
NOmSLIgt7 #pragma data_seg()
:kI
x?cc Z@i MG 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。
kqAQrg]n NU/~E"^I. 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:
e$(i!G) M/sqOhg BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
5p{tt;9[ cKey,UCHAR cMask)
")M.p_b[Z= {
Pq7tNM E BOOL bAdded=FALSE;
L@R%*-a for(int index=0;index<MAX_KEY;index++){
&(^>}&XS.< if(hCallWnd[index]==0){
Q+ST8 hCallWnd[index]=hWnd;
Sdt2D HotKey[index]=cKey;
qV$',U*+T HotKeyMask[index]=cMask;
t_VHw'~" bAdded=TRUE;
fW}H##b KeyCount++;
[]pN$]+c break;
;0%OB*lcgE }
W;_E 4 }
6g:|*w return bAdded;
{dWObh }
e":G*2a //删除热键
z8_XX$Mnt BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
YK#fa2ng {
(P|pRVO BOOL bRemoved=FALSE;
!nf-}ze{ for(int index=0;index<MAX_KEY;index++){
m_NCx]#e
if(hCallWnd[index]==hWnd){
EG<s_d? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8At<Wic hCallWnd[index]=NULL;
['qnn| HotKey[index]=0;
:$r ^_ HotKeyMask[index]=0;
YA]5~ZE\ bRemoved=TRUE;
evuZY X@ KeyCount--;
t#E}NR break;
Gu0 ,)jy\ }
?}P5p^6 }
`)$_YZq|SR }
)7c b6jCU return bRemoved;
Tny>D0Z# }
olux6RP[B <yUstz,Xu^ KA s 1(oG DLL中的钩子函数如下:
~.g3ukt $4=f+ "z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
a:STQk V {
c,\i"=!$ BOOL bProcessed=FALSE;
\%jVg\4' if(HC_ACTION==nCode)
,El!fgL {
oA-:zz>wL if((lParam&0xc0000000)==0xc0000000){// 有键松开
{tP%epQ switch(wParam)
/B3R1kNf| {
#o`Ny4sq/ case VK_MENU:
r0t^g9K0 MaskBits&=~ALTBIT;
3uU]kD^ break;
j1?j6s case VK_CONTROL:
yNW\?Z$@q MaskBits&=~CTRLBIT;
kh~'Cn "O break;
&wd;EGGT!q case VK_SHIFT:
7A\Cbu2tf MaskBits&=~SHIFTBIT;
"xcX'F^ break;
Vt^3iX{! default: //judge the key and send message
h'J|K^na break;
hc
(e$## }
U<"WK"SM for(int index=0;index<MAX_KEY;index++){
OJT1d-5p if(hCallWnd[index]==NULL)
GWsE; continue;
L!/\8-&$P if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
qbrp P(. {
Er/bO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4v
p bProcessed=TRUE;
mOo`ZcTU }
-?]W*f }
u&G.4QQF }
qQ\Y/}F else if((lParam&0xc000ffff)==1){ //有键按下
7\_o.(g#- switch(wParam)
Nu8Sr]p {
ly% F."v case VK_MENU:
PcB_oG g MaskBits|=ALTBIT;
gOgps: break;
js1!9%BV case VK_CONTROL:
Z\[N!Zt| MaskBits|=CTRLBIT;
zYXV; break;
OY[e.N
t& case VK_SHIFT:
"5cM54Z0 MaskBits|=SHIFTBIT;
R.7 :3h break;
~['Kgh_; default: //judge the key and send message
$/Aj1j`"9+ break;
MO;X>D = }
'B+ ' (f for(int index=0;index<MAX_KEY;index++){
rt
JtK6t if(hCallWnd[index]==NULL)
m*e{\)rd# continue;
.ROznCe} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!lo/xQ< {
rD>*j~_+P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`1 :{0p2q bProcessed=TRUE;
~>9_(L }
VDTcR }
c8Z wr]DF }
=4d (b ; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Bc3:}+l for(int index=0;index<MAX_KEY;index++){
zB yqD$ if(hCallWnd[index]==NULL)
O-)-YVU continue;
ETs>`#`6o if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
@cU&n6C@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
h gJ[LU| > //lParam的意义可看MSDN中WM_KEYDOWN部分
Fl(T\-Eu }
pW4 cX }
OR[{PU=X }
z3?o|A }/W return CallNextHookEx( hHook, nCode, wParam, lParam );
HSq}7S&U }
FVhU^ )8g(:`w 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:
8QMPY[{ Sna4wkbS BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
NHlk|Y#6b BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LdJYE;k Ju s+>:,U<A 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:
E!S 78z: sVex
(X LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
\TU3rk&X {
RejQ5'Neh if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
37}D9:#5C {
1'?4m0W1 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Y`?-VaY SaveBmp();
/*0K92NB return FALSE;
,0LU~AGe
}
m# =z7.XrX …… //其它处理及默认处理
7 [0L9\xm }
/hO1QT}xd .`&F>o(A ;| 1$Q!4 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Nz)l<S9> kZ"BBJ6w 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
|fo0 TsTPj8GAl[ 二、编程步骤
_o8?E&d R4-~j gzx 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
X]y)qV)a[c 0V?F'<qy 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
=9T$Gr c [5KG} 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;
^aW
Z!gi O+ICol 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;
}}<z/zN&^ o6p98Dpg 5、 添加代码,编译运行程序。
A<ynIs< M'/aZ#
b 三、程序代码
i7ly[6{^pr k!{p7*0 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
p'om- #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
edPUG
N #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
&ot/nQQ #if _MSC_VER > 1000
]~Z6; #pragma once
0#MqD[U( #endif // _MSC_VER > 1000
//aF5:Y# #ifndef __AFXWIN_H__
Gw1@KKg #error include 'stdafx.h' before including this file for PCH
:Lz\yARpk #endif
3g6j?yYqb #include "resource.h" // main symbols
nWHa.H# class CHookApp : public CWinApp
=lpQnj" {
3*@5S]] public:
Sr?#S CHookApp();
`HBf&Z // Overrides
OD_W8!- // ClassWizard generated virtual function overrides
_l1NKk //{{AFX_VIRTUAL(CHookApp)
`ta7Gc/:UY public:
*Aa?yg:= virtual BOOL InitInstance();
!3ctB3eJ virtual int ExitInstance();
Exk\8,EGqS //}}AFX_VIRTUAL
$r3i2N-I //{{AFX_MSG(CHookApp)
F_4n^@M // NOTE - the ClassWizard will add and remove member functions here.
^k\e8F/ // DO NOT EDIT what you see in these blocks of generated code !
p
l&Muv //}}AFX_MSG
]EpWSs!"g DECLARE_MESSAGE_MAP()
x|5k<CiA };
b4pm_Um LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=ha{Ziryo BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
&:7ZQ1 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
42qYg(tZ BOOL InitHotkey();
.e3+s* BOOL UnInit();
SZXY/~=h #endif
k|!EDze43? O
&-wxJ]S //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
@|tL8? #include "stdafx.h"
jt.3P #include "hook.h"
>orK';r< #include <windowsx.h>
]i)j3WDz] #ifdef _DEBUG
H_QsNf #define new DEBUG_NEW
P$-X)c$& #undef THIS_FILE
DX|#
gUAm static char THIS_FILE[] = __FILE__;
f^.AD- #endif
EEW_gFn #define MAX_KEY 100
jNC4_q& #define CTRLBIT 0x04
y? co| #define ALTBIT 0x02
0xXC^jx: #define SHIFTBIT 0x01
;I!MLI #pragma data_seg("shareddata")
x>Jr_A( HHOOK hHook =NULL;
>HS W]"k UINT nHookCount =0;
*~x/=.} static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
0/oyf]HR static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
9,"L^W8"k static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
,11H.E
Z static int KeyCount =0;
*C:|X b<9 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
+PuPO9jKO@ #pragma data_seg()
#&7}-"Nd HINSTANCE hins;
2m2;t0 void VerifyWindow();
=7o"u3hG BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
P->y_4O //{{AFX_MSG_MAP(CHookApp)
]: ~OG@( // NOTE - the ClassWizard will add and remove mapping macros here.
o+$7'+y1n- // DO NOT EDIT what you see in these blocks of generated code!
c?,i3s+2Y //}}AFX_MSG_MAP
e[#j.|m END_MESSAGE_MAP()
v7`HQvQEz= d8x \ CHookApp::CHookApp()
]]wA[c~G {
}B.H|*uO // TODO: add construction code here,
|a!fhl+ // Place all significant initialization in InitInstance
[E
] E }
w&KK3*="" n .RhxgC< CHookApp theApp;
w:<W.7y?0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E3iW-B8u8 {
:B:"NyPA BOOL bProcessed=FALSE;
6 M*O{f if(HC_ACTION==nCode)
n= u&uqA* {
&sL&\+=<( if((lParam&0xc0000000)==0xc0000000){// Key up
?28N ^ switch(wParam)
r|qp3x {
*^wm1|5 case VK_MENU:
IDG}ZlG MaskBits&=~ALTBIT;
\9g+^vQg break;
*NCl fkZ case VK_CONTROL:
9& 83n(m MaskBits&=~CTRLBIT;
GJqJlgHe break;
\0f{S40 case VK_SHIFT:
s=QAO!aw MaskBits&=~SHIFTBIT;
i0$kit break;
ZXuv CI default: //judge the key and send message
%GS(:]{n break;
#: [<iSk }
Ch3jxgQY for(int index=0;index<MAX_KEY;index++){
U b* wuI if(hCallWnd[index]==NULL)
uPl\I6k continue;
`p;I} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
y;o^- O {
UaB @ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
M!XsJ<jN/ bProcessed=TRUE;
<U\B!fO' }
Y1J=3Y }
A"rfZ` }
LpqO{#ZG else if((lParam&0xc000ffff)==1){ //Key down
lH6OcD:kj switch(wParam)
^*Yh@4\{JH {
9uA>N case VK_MENU:
L=sYLC6d MaskBits|=ALTBIT;
J\M>33zu break;
<
RH UH)I case VK_CONTROL:
T
r1?620 MaskBits|=CTRLBIT;
LB a[:j2 break;
TmV,&['mg case VK_SHIFT:
Us0EG\Y MaskBits|=SHIFTBIT;
>)M`IU[d^. break;
|)@N-f:E default: //judge the key and send message
nj\_lL+ break;
zL s^,x }
|t\|:E>" } for(int index=0;index<MAX_KEY;index++)
uC~g#[I QM {
.9LL+d if(hCallWnd[index]==NULL)
Vos?PqUi 4 continue;
ew#T8F[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GoE#Mxh xo {
>kdM:MK SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
OR+A_:c.D bProcessed=TRUE;
C]`eH*z~8 }
/hdf{4 }
4FA|[An }
[V@yRWI if(!bProcessed){
"7?js $ for(int index=0;index<MAX_KEY;index++){
OoP@-D"e if(hCallWnd[index]==NULL)
i#,1iVSG continue;
pH9HK if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+0pW/4x SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
i+~QDo(Pi }
&]nd!N
}
'\*A"8;h }
R @r{ return CallNextHookEx( hHook, nCode, wParam, lParam );
<q7s`,rG }
A9BxwQU# |vy]8?Ak BOOL InitHotkey()
v#=ayWgk {
J1-):3A if(hHook!=NULL){
[:i sZG* nHookCount++;
0]a1 5 return TRUE;
+)-d_K.(k }
(G5T%[/U else
1hNEkpL^a hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
ZA.fa0n if(hHook!=NULL)
Za\RM[Z!I nHookCount++;
;a{rWz1Wm return (hHook!=NULL);
0=m&^Jpp }
zjoo{IH} BOOL UnInit()
t/LgHb:) {
dKe@JQ+-z if(nHookCount>1){
U8Jj(]},_ nHookCount--;
j/IZm)\ return TRUE;
Llc|j&yHQ }
TUn@b11 BOOL unhooked = UnhookWindowsHookEx(hHook);
3E@&wpj if(unhooked==TRUE){
)Nd:PnA nHookCount=0;
nhhJUN?8 hHook=NULL;
SF=|++b1f }
+!rK4[W' return unhooked;
l[gL(p"W }
)+J?(&6 /u
hA\m( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
| %E\?-TK {
5Q_T=TL BOOL bAdded=FALSE;
[!^Q_O for(int index=0;index<MAX_KEY;index++){
j_=A)B? if(hCallWnd[index]==0){
|%wgux`z hCallWnd[index]=hWnd;
<P)U Ggd HotKey[index]=cKey;
%V40I{1 HotKeyMask[index]=cMask;
H{XbKLU bAdded=TRUE;
Xr?(w(3 KeyCount++;
)C?bb$
G break;
h8R3N?S3# }
%BdQ.\4DS }
>ts}\.(] return bAdded;
"q1S.3V; }
N=7iQ@{1 23Dld+E& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
dG8mE&$g {
%IE;'aa
} BOOL bRemoved=FALSE;
Ke3~o"IQ for(int index=0;index<MAX_KEY;index++){
+> d;%K if(hCallWnd[index]==hWnd){
/d">}%Jn if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
-T i<H9OV hCallWnd[index]=NULL;
>,tJq% HotKey[index]=0;
Aqz $WTHW+ HotKeyMask[index]=0;
MM*~X"A bRemoved=TRUE;
10.ZBfn KeyCount--;
Qx3eEt@X5] break;
G@Sqg }
9<i M2(IW{ }
u8<[Q]5 }
"KS"[i!3j return bRemoved;
Mk=*2=d }
B0Ay Ayv:Pv@ void VerifyWindow()
[i.c;'Wy/ {
Vgkj4EE for(int i=0;i<MAX_KEY;i++){
+'iqGg- if(hCallWnd
!=NULL){ 3-6MGL9
if(!IsWindow(hCallWnd)){ {O).!
hCallWnd=NULL; 3Nwix_&S
HotKey=0; 8z7eL>)
HotKeyMask=0; $)c[FR~a
KeyCount--; F(Zf=$cx
} @8w5Oudvx
} 1*$6u5.=F
} \,n
X/f
} ZZwIB3sNhf
fv+d3s?h
BOOL CHookApp::InitInstance() @$L|
{ ~`^kP.()
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1Z;cb0:
hins=AfxGetInstanceHandle(); #H4<8B
InitHotkey(); 5-k gGOt
return CWinApp::InitInstance(); q4Bw5~n
} `F1Yfm
jZT
:?= 1aiS
int CHookApp::ExitInstance() J7oj@Or9
{ 92R,o'#
VerifyWindow(); E BoC,{R#
UnInit(); \K}KnJ
return CWinApp::ExitInstance(); .HGK 3
} C`3XOth
e]ST0J"
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]9'F<T= $_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;{&4jcV*
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ xaB#GdD
#if _MSC_VER > 1000 -:Fr($^
#pragma once IG;=
|
#endif // _MSC_VER > 1000 {M=B5-
p[%~d$JUq
class CCaptureDlg : public CDialog n ~ &ssFC
{ D'{o3Q,%K
// Construction OVgak>$
public: U8HuqFC
BOOL bTray; Wnp[8IEU
BOOL bRegistered; qzHsqlof
BOOL RegisterHotkey(); wt'"<UN
UCHAR cKey; M&",7CPD(1
UCHAR cMask; f* h nzj
void DeleteIcon(); ~R=p[h)
void AddIcon(); rW~G'
UINT nCount; ts@e
,
void SaveBmp(); .{bT9Sc5
CCaptureDlg(CWnd* pParent = NULL); // standard constructor dvY3=~'
// Dialog Data N>P" $
//{{AFX_DATA(CCaptureDlg) [Q6$$z92Q
enum { IDD = IDD_CAPTURE_DIALOG }; B=X_c5
CComboBox m_Key; @^-f+o
BOOL m_bControl; LS#_K-
BOOL m_bAlt; c^&:':Z%'
BOOL m_bShift; 4
BNbS|?vV
CString m_Path; eSMno_Gt3
CString m_Number; .>y3`,0h
//}}AFX_DATA #0#6eT{-
// ClassWizard generated virtual function overrides lfwBUb
//{{AFX_VIRTUAL(CCaptureDlg) eR3MU]zF
public: ,>TDxI;
virtual BOOL PreTranslateMessage(MSG* pMsg); T0\[":
A
protected: 3A\Hiy!{F
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N$ 2Iz
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [{ A5BE -
//}}AFX_VIRTUAL IY(;:#l
// Implementation L>57eF)7
protected: H
a`V"X{}
HICON m_hIcon; J+hifO
// Generated message map functions 4%TmW/yd
//{{AFX_MSG(CCaptureDlg) jwwst\f
virtual BOOL OnInitDialog(); '}P$hP_d
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zfGr1;
afx_msg void OnPaint(); gkx<<)y
l
afx_msg HCURSOR OnQueryDragIcon(); zn\$6'"
virtual void OnCancel(); z}7U>y6`
afx_msg void OnAbout(); >LEp EMJ\
afx_msg void OnBrowse(); GsE
=5A8
afx_msg void OnChange(); 7bkh")^
//}}AFX_MSG t@`Sa<
DECLARE_MESSAGE_MAP() o-]8)G>~M
}; TiI3<.a!
#endif k )fLJ9R
U }}E
E~W
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `S=4cS H(
#include "stdafx.h" 2|8$@*-\
#include "Capture.h" #j"N5e}U
#include "CaptureDlg.h" ogE|8`Tq^
#include <windowsx.h> V"sm+0J
#pragma comment(lib,"hook.lib") [\ppK C
#ifdef _DEBUG 9
J~KM=p
#define new DEBUG_NEW B+=Xb;p8
#undef THIS_FILE ,#80`&\%
static char THIS_FILE[] = __FILE__; D4QLlP
#endif LGC3"z\=
#define IDM_SHELL WM_USER+1 "NO*(<C.R
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A)o%\j
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |f"1I4Kg
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5%XEybc2
class CAboutDlg : public CDialog 3VmF1w
2
{ ?rububDT{
public: ::G0v
CAboutDlg(); 17;qJ_T)
// Dialog Data EoHrXv
//{{AFX_DATA(CAboutDlg) qu0dWgK
enum { IDD = IDD_ABOUTBOX }; ^o6&|q
//}}AFX_DATA r*4@S~;
// ClassWizard generated virtual function overrides WEB enGQ
//{{AFX_VIRTUAL(CAboutDlg) ao)8ie
protected: tY$4k26
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u1i
?L'
//}}AFX_VIRTUAL {,CvWL
// Implementation *v9 {f?
protected: {'eF;!!Dy
//{{AFX_MSG(CAboutDlg) 7e`h,e=
//}}AFX_MSG 3r,^is
DECLARE_MESSAGE_MAP() }{m.\O
}; k8ej.
Z?tw#n[T
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &IgH]?t
{ w`r)B`!g
//{{AFX_DATA_INIT(CAboutDlg) 9jTm g%
//}}AFX_DATA_INIT H;rLU9b
} Cu+u'&U!
F
{T\UX
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y@Q?
guB
{ ,2_!hm/
CDialog::DoDataExchange(pDX); ZpQ8KY$5
//{{AFX_DATA_MAP(CAboutDlg) $>y
//}}AFX_DATA_MAP b!xm=U
} [xsiSt?6
U/I+A|S[
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _ 0Ced&i
//{{AFX_MSG_MAP(CAboutDlg) =)Q0=!%-
// No message handlers K~JXP5`(
//}}AFX_MSG_MAP z("Fy
END_MESSAGE_MAP() mrz@Y0mgL
6$^dOJ_"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %!e;sL~&
: CDialog(CCaptureDlg::IDD, pParent) ;BMm47<
{ |]9Z#lv+I
//{{AFX_DATA_INIT(CCaptureDlg) wk"zpI7L
m_bControl = FALSE; hPHrq{YZ
m_bAlt = FALSE; ^ M4-O~
m_bShift = FALSE; {<3>^ o|"
m_Path = _T("c:\\"); !1\jD
m_Number = _T("0 picture captured."); j,/t<@S>
nCount=0; t846:Z%[
bRegistered=FALSE; Ut
xe
bTray=FALSE; "gPAxt
//}}AFX_DATA_INIT )4P5i
b
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9k@`{+wmZ
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); XiB]I5(hcc
} br9`77J8
Lx"a #rZ
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8/y~3~A{D
{ {PCf'n
CDialog::DoDataExchange(pDX); f1RfNiW.
//{{AFX_DATA_MAP(CCaptureDlg) ~?c}=XL-
DDX_Control(pDX, IDC_KEY, m_Key); \#A=twp
DDX_Check(pDX, IDC_CONTROL, m_bControl);
Dy[
YL
DDX_Check(pDX, IDC_ALT, m_bAlt); =!`\=!y
DDX_Check(pDX, IDC_SHIFT, m_bShift); O<x53MN^
DDX_Text(pDX, IDC_PATH, m_Path); S}hg*mWn{$
DDX_Text(pDX, IDC_NUMBER, m_Number); A<&:-Zz
//}}AFX_DATA_MAP c[Mz#BWG
} FDAREE\j
(qP !x 2j
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n>dM OQb
//{{AFX_MSG_MAP(CCaptureDlg) zq5_&AeW
ON_WM_SYSCOMMAND() N
-]m <z>
ON_WM_PAINT() A_t<SG5
ON_WM_QUERYDRAGICON() !!c.cv'
ON_BN_CLICKED(ID_ABOUT, OnAbout) rGZ@pO2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Wb4%=2Qn
ON_BN_CLICKED(ID_CHANGE, OnChange) /rNY;qXM
//}}AFX_MSG_MAP XU0"f!23x
END_MESSAGE_MAP() ~X;(m<f2
Dz&4za+{
BOOL CCaptureDlg::OnInitDialog() d]e`t"Aj
{ EMH?z2iGd
CDialog::OnInitDialog(); is}Fy>9i
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U6=m4]~Z
ASSERT(IDM_ABOUTBOX < 0xF000); %a/O7s 6
CMenu* pSysMenu = GetSystemMenu(FALSE); kmW!0hm;e
if (pSysMenu != NULL) 9wKz p
{ e7L;{+XI
CString strAboutMenu; su=.4JcK
strAboutMenu.LoadString(IDS_ABOUTBOX); sZ'3PNpCP
if (!strAboutMenu.IsEmpty()) gr=ke #
{ /KKX;L[D(
pSysMenu->AppendMenu(MF_SEPARATOR); A|>a
Gy
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); c_^H;~^rL
} 7<.f&1MgI
} d(a6vEL4
SetIcon(m_hIcon, TRUE); // Set big icon #8/Z)-G
SetIcon(m_hIcon, FALSE); // Set small icon dbZPt~S'$
m_Key.SetCurSel(0); ^U_jeAuk8[
RegisterHotkey(); sZ4H\
CMenu* pMenu=GetSystemMenu(FALSE); |J}~a8o
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _F3vC#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .Yu,&HR
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {{DW P-v4
return TRUE; // return TRUE unless you set the focus to a control ]c5GG!E-g
} U3U eTa_
o!H"~5Trv!
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) x`eYC i
{ &FanD
if ((nID & 0xFFF0) == IDM_ABOUTBOX) sU}e78m h
{ $K
G?d>wx
CAboutDlg dlgAbout; fg1 zT~
dlgAbout.DoModal(); 1%=,J'AH
} OIWo*
%
else c&_3"2:
{ QnGJ4F
CDialog::OnSysCommand(nID, lParam); iCEX|Tj;
} i/Hi
} yi%B5KF~Al
0s4j>
void CCaptureDlg::OnPaint() (p2a{v}fEz
{ [,e_2<
if (IsIconic()) hmi15VW
{ Z3/ zUtgs
CPaintDC dc(this); // device context for painting [p(C:rH
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); N,1wfOE
// Center icon in client rectangle 4@Qq5kpk*
int cxIcon = GetSystemMetrics(SM_CXICON); a&<<X:$Hy
int cyIcon = GetSystemMetrics(SM_CYICON); 8_LDS
CRect rect; {p/m+m
GetClientRect(&rect); = G_6D
int x = (rect.Width() - cxIcon + 1) / 2; I[|I\tW
int y = (rect.Height() - cyIcon + 1) / 2; $ S49v
// Draw the icon (+@.L7>m+t
dc.DrawIcon(x, y, m_hIcon); (*1A0+S90
} xWMMHIu
else ppYz~ {"r
{
1Li@O[%X<
CDialog::OnPaint(); E>I\m!ue
} z&KrG
} "&Rt&S
Qo$j'|lD
HCURSOR CCaptureDlg::OnQueryDragIcon() iO@UzD#v
{ fPBJ%SZ
return (HCURSOR) m_hIcon; euiP<[|h=
} bGtS! 'I
h"3Mj*s
void CCaptureDlg::OnCancel() fK{m7?V
{ wG@f~$
if(bTray) 4^(aG7
DeleteIcon(); riv8qg
CDialog::OnCancel(); %5$)w;p.$'
}
H ]z83:Z
!*e1F9k
void CCaptureDlg::OnAbout() ~J:]cy)Q
{ K
7OIT2-
CAboutDlg dlg; #1De#uZ
dlg.DoModal(); Zk ] /m
} 572{DC&T
o]M1$)>b+
void CCaptureDlg::OnBrowse() 10d.&vNw
{ pf$gvL
CString str; .]w=+~h
BROWSEINFO bi; ~JQ6V?fucD
char name[MAX_PATH]; =1Hn<Xay0
ZeroMemory(&bi,sizeof(BROWSEINFO)); alH6~
bi.hwndOwner=GetSafeHwnd(); fSF_O}kLp
bi.pszDisplayName=name; Marx=cNj
bi.lpszTitle="Select folder"; ,GF]+nI89
bi.ulFlags=BIF_RETURNONLYFSDIRS; $1 t
IC_
LPITEMIDLIST idl=SHBrowseForFolder(&bi); cq0-Dd9^&
if(idl==NULL) ShesJj
return; N 9W,p2
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X;]Ijha<*
str.ReleaseBuffer(); v\o
m
m_Path=str; 7!dj&?
if(str.GetAt(str.GetLength()-1)!='\\') <?>tjCg'
m_Path+="\\"; Rt>mAU$}
UpdateData(FALSE); {l"(EeW6)
} 0`V;;w8
o3$dl`'
void CCaptureDlg::SaveBmp() iNr&;
{ 6UI6E)g
CDC dc; y*
:C~
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^8KxU
CBitmap bm; Kr?<7vMT5
int Width=GetSystemMetrics(SM_CXSCREEN); gBr/Y}I
int Height=GetSystemMetrics(SM_CYSCREEN); `S+n,,l
bm.CreateCompatibleBitmap(&dc,Width,Height); (8baa.ge
CDC tdc; dVg'v7G&V(
tdc.CreateCompatibleDC(&dc); 5"y)<VLJX
CBitmap*pOld=tdc.SelectObject(&bm); gO{$p q}
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); B@v
(ZY
tdc.SelectObject(pOld); V?)YQB
BITMAP btm; %l,CJd5
bm.GetBitmap(&btm); pk`5RDBu
DWORD size=btm.bmWidthBytes*btm.bmHeight; PhAD:A
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); x2TE[#><
BITMAPINFOHEADER bih; _0BQnzC=
bih.biBitCount=btm.bmBitsPixel; hBaF^AWW
bih.biClrImportant=0; E@EP9X
>
bih.biClrUsed=0; EeHghq
bih.biCompression=0; 3?D{iMRM
bih.biHeight=btm.bmHeight; =d+`xN*
bih.biPlanes=1; "!_vQ^y
bih.biSize=sizeof(BITMAPINFOHEADER); w/:ibG@
bih.biSizeImage=size; TqSjL{l%
bih.biWidth=btm.bmWidth; k{O bm
g
bih.biXPelsPerMeter=0; 6VS_L@
bih.biYPelsPerMeter=0; .K1wp G[4
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )3 R5cq
static int filecount=0; 97 ,Y q3
CString name; nBLb1T
name.Format("pict%04d.bmp",filecount++); u@P1`E1Q
name=m_Path+name; B`gH({U
BITMAPFILEHEADER bfh; _Fn`G.r<
bfh.bfReserved1=bfh.bfReserved2=0; Al]*iw{
bfh.bfType=((WORD)('M'<< 8)|'B'); VoQhzp6&
bfh.bfSize=54+size; EG|_YW7
bfh.bfOffBits=54; C4GkFD
CFile bf; :Gzp
(@<@e
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R\Ckk;<$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0x<G\ l4
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dWu;F^
bf.WriteHuge(lpData,size); =p7id5"
bf.Close(); ?*[35XUd
nCount++; ;Wa&Dg/5`
} |WpJen*?Y
GlobalFreePtr(lpData); gyPwNE
if(nCount==1) o\PHs4Ws'7
m_Number.Format("%d picture captured.",nCount); u#`51Hr$
else KfYT
m_Number.Format("%d pictures captured.",nCount); xZM4CR9]*C
UpdateData(FALSE); *=!r|UdB.
} :Rnwyj])
~w9`l8/0
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V6h8+|hK
{ ]"?<y s
if(pMsg -> message == WM_KEYDOWN) '1fyBU
{ VS!v7-_N5
if(pMsg -> wParam == VK_ESCAPE) 9Zmq7a
E
return TRUE; HuKOb4g
if(pMsg -> wParam == VK_RETURN) `Q/\w1-Q
return TRUE; 3xKgj5M
} ~=t9-AF-
return CDialog::PreTranslateMessage(pMsg); [wnaF|h
} ,rF!o_7
)>^ Ge9d]
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ):nC%0V
{ JoZzX{eu"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \qlz<
SaveBmp(); vA[7i*D{w
return FALSE; *~*"p)`<
} _^ic@h3'X~
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %o0 H#7'
CMenu pop; 3`RI[%AN~
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dWe%6s;
CMenu*pMenu=pop.GetSubMenu(0); tA'5ufj*:
pMenu->SetDefaultItem(ID_EXITICON);
U z[#ye
CPoint pt; tp }Bz&V
GetCursorPos(&pt); (:%t
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4d}n0b\d
if(id==ID_EXITICON) :_nGh]%
DeleteIcon(); ;B(16&l=q
else if(id==ID_EXIT) G `B=:s]
OnCancel(); -mo4`F
return FALSE; [Ls%nz|
} sJl>evw
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ir*{IVvej
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 'WBhW5@
AddIcon(); RzFxO
return res; RyM29uD
} 'aEN(Mdz1e
d>c`hQ(V
void CCaptureDlg::AddIcon() 9>vB,8
{ |lu@rN
NOTIFYICONDATA data; jHA(mU)b
data.cbSize=sizeof(NOTIFYICONDATA); gp
H@FX
CString tip; Ox)_7A
tip.LoadString(IDS_ICONTIP); f8UO`*O
data.hIcon=GetIcon(0); h uR ^l
data.hWnd=GetSafeHwnd(); |?MD>Pez
strcpy(data.szTip,tip); \yLFV9P}EL
data.uCallbackMessage=IDM_SHELL; %\)AT"
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; HzuG- V
data.uID=98; 9#~jlq(
Shell_NotifyIcon(NIM_ADD,&data); [D?d~pB
ShowWindow(SW_HIDE); &NbSG+t
bTray=TRUE; p1&=D%/
} R?N+./{
s&wm^R
void CCaptureDlg::DeleteIcon() $"}*#<Z
{ 62G%.'7
NOTIFYICONDATA data; beV+3HqB8
data.cbSize=sizeof(NOTIFYICONDATA); I).eQ8:
data.hWnd=GetSafeHwnd(); d`j<Bbf-
data.uID=98; @ Yo*h"s
Shell_NotifyIcon(NIM_DELETE,&data); lR`.V0xA
ShowWindow(SW_SHOW); ?#nk}=;g8
SetForegroundWindow(); j<9^BNl
ShowWindow(SW_SHOWNORMAL); /;u=#qu(E-
bTray=FALSE; ]!/R tt
} /R6\_oM
=vDDfPR
void CCaptureDlg::OnChange() =Pp-9<&S
{ bz [?M}
RegisterHotkey(); #&z'?x^a
} N%=,S?b
Tl?jq]
BOOL CCaptureDlg::RegisterHotkey() fN9uSnu
{ 6\y?+H1
UpdateData(); UA4MtTp`
UCHAR mask=0; GK3cQw
UCHAR key=0; q!Z{qt*`um
if(m_bControl) tCu.Fc@
mask|=4; Sg\+al7
if(m_bAlt) lt\Bm<"z!1
mask|=2; lcfs
1].
if(m_bShift) /U6ry'
mask|=1; ':f,RG
key=Key_Table[m_Key.GetCurSel()]; 'HL.W](
if(bRegistered){ WP^wNi
~>
DeleteHotkey(GetSafeHwnd(),cKey,cMask); x}{O9LiR
bRegistered=FALSE; >3I|5kZ6
} EK\xc'6M
cMask=mask; ws$kwSHq
cKey=key; Ak3V< =gx
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .B!
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return bRegistered; UI~ hB4V$]
} _Y)Wi[
D23 c/8K
四、小结 DIkf#}
on1B~?*D
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。