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:
WJkZ!O$"j
$RIecv<e_ 一、实现方法
t\{'F7 &]v4@%<J 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
vY${;#~| R`DKu= #pragma data_seg("shareddata")
[<g?WPCcC HHOOK hHook =NULL; //钩子句柄
u'|4?"uz UINT nHookCount =0; //挂接的程序数目
||hb~%JK6 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
lOuHVa*} static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
\{Z;:,S static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
>*#1ZB_l static int KeyCount =0;
1 u| wMO static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
?'@8kpb #pragma data_seg()
=|3ek T92UeG 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。
]B%v+uaW Po__-xN>Q 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:
EN;}$jZ>47 s:#V(<J BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
sk,ox~0R cKey,UCHAR cMask)
4cabP}gBk {
g`vny )\7/ BOOL bAdded=FALSE;
aT)BR?OYSJ for(int index=0;index<MAX_KEY;index++){
*W0y: 3dB3 if(hCallWnd[index]==0){
kI
4MiK hCallWnd[index]=hWnd;
Bm.:^:&k HotKey[index]=cKey;
bx{$Y_L+p HotKeyMask[index]=cMask;
w)kNkD bAdded=TRUE;
@eD):Y KeyCount++;
tD(7^GuR break;
VY;{/.Sa }
OjJXysslXO }
Y;@>b{s return bAdded;
1zm ulj%& }
Pe3@d|-,MU //删除热键
XC0bI,Fu, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4e~A1- {
#A1Z'y0 BOOL bRemoved=FALSE;
%Y<| ;0v for(int index=0;index<MAX_KEY;index++){
R?~Yp?B^ if(hCallWnd[index]==hWnd){
%k-3?%&8 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ein4^o<f. hCallWnd[index]=NULL;
Kwefs;<E? HotKey[index]=0;
Hv
sob HotKeyMask[index]=0;
&]e'KdXF bRemoved=TRUE;
s2'yY(u/ KeyCount--;
TUV&vz{ break;
,SynnE68 }
iYORu3 }
< Z{HX[y }
L;VoJf return bRemoved;
Co (.:z~ }
iop2L51eJ C([phT; 3L833zL DLL中的钩子函数如下:
e+$p9k~ *.sVr7=j LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
v0-cd {
42e|LUZg BOOL bProcessed=FALSE;
SM0~fAtE if(HC_ACTION==nCode)
tZ=E')!\ {
\
e\?I9 if((lParam&0xc0000000)==0xc0000000){// 有键松开
{QcLu"?c switch(wParam)
Qy^1*j<@& {
4L ;% h case VK_MENU:
-=)+dCyB^ MaskBits&=~ALTBIT;
E*.{=W }C break;
e,F1Xi#d case VK_CONTROL:
\>jLRb|7Ts MaskBits&=~CTRLBIT;
(]0%}$Fo break;
!V"<U2 case VK_SHIFT:
4
Y;Nm1@ MaskBits&=~SHIFTBIT;
Mn9dqq~a break;
"uuVy$6C default: //judge the key and send message
2^mJ+v< break;
9o;^[Ql- }
-yE/f2PgQ for(int index=0;index<MAX_KEY;index++){
QrB@cK] if(hCallWnd[index]==NULL)
KM}f:_J*lg continue;
]+|~cRQ9I if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Y
;u<GOe {
4wID]bKM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
<(-= 'QA bProcessed=TRUE;
$FlW1E j }
0vEoGgY0*: }
vy0X_DPCr }
p<TpK ) else if((lParam&0xc000ffff)==1){ //有键按下
?]Pmxp
H} switch(wParam)
CN#+U,NZV {
qUjmB sB case VK_MENU:
{;N,t]>8M MaskBits|=ALTBIT;
6|aKL[%6 break;
jGXO\:sO case VK_CONTROL:
ofPHmh` MaskBits|=CTRLBIT;
!lf|7 break;
ap&?r`Tu case VK_SHIFT:
4]h
=yc R MaskBits|=SHIFTBIT;
$
et0s;GBv break;
MaRi+3F default: //judge the key and send message
zo +nq%= break;
[q/Abz'i }
p[hZ@f(z for(int index=0;index<MAX_KEY;index++){
cxA ^:3 if(hCallWnd[index]==NULL)
gZLP\_CL continue;
lDOCmdt@N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0J?~N`#O| {
Y' %^NP}o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Fy`(BF\ bProcessed=TRUE;
iz8Bf; }
_CW(PsfY }
:uWw8` }
_AQb6Nb
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
\^ZlG. for(int index=0;index<MAX_KEY;index++){
P%{^ i] if(hCallWnd[index]==NULL)
4a'N>eDR continue;
r<K(jG[:{f if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
V,q](bg SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Pa{%\dsv //lParam的意义可看MSDN中WM_KEYDOWN部分
BFL`!^ }
JHz
[ 7 }
pQshUm"_ }
<\NY<QIwFw return CallNextHookEx( hHook, nCode, wParam, lParam );
B$b +Ymu }
in~D 'NX```U0 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:
.q9
$\wM/ /LO-HnJ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
o
Z%9_$Z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
a^`rtvT D+>4AqG 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:
o$w_Es]Ma ~~v3p>z Rr LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
?Lyxw] {
p?B=1vn-2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
2Ou[u#H {
gW-V=LV ( //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
'yL%3h
_@ SaveBmp();
Ag&0wN+jTM return FALSE;
H-~6Z",1 }
QA<Jr5Ys …… //其它处理及默认处理
XmEq2v }
GM3f-\/ cm?\
-[cV P8>~c9$I 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。
^c&L,!_)H # a<Gxj 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。
VH+%a<v" bsB*533 二、编程步骤
:/Q ,wIONDnLZ 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";
rcMwFE?|xq +n#V[~~8AI 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
%kdEun $Hj.{;eC/k 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
G*-b}f T;,cN7>>O 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
Cq'KoN%nQ SzjkI+-$: 5、 添加代码,编译运行程序。
p4'G$]# gREzZ+([ 三、程序代码
VxVE #`o2Z ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
qNYN-f~@, #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
||;hciO #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<$X3Hye #if _MSC_VER > 1000
BZR:OtR^ #pragma once
nPye,"A Ol #endif // _MSC_VER > 1000
:.$3vaZ@ #ifndef __AFXWIN_H__
}[4r4 1[ #error include 'stdafx.h' before including this file for PCH
~g5[$r-u-u #endif
8=gjY\Dp #include "resource.h" // main symbols
M+w=O!dq class CHookApp : public CWinApp
ptU\[Tq {
*T5!{ public:
i70wrW#k CHookApp();
]=>F.GE // Overrides
.
koYHq // ClassWizard generated virtual function overrides
4scNSeW //{{AFX_VIRTUAL(CHookApp)
i[?Vin public:
>AcrG] virtual BOOL InitInstance();
Ib+Y~
XYR virtual int ExitInstance();
V+VkY3 //}}AFX_VIRTUAL
4<k9?)~(J //{{AFX_MSG(CHookApp)
Pmh8sw // NOTE - the ClassWizard will add and remove member functions here.
wS%Q<uK // DO NOT EDIT what you see in these blocks of generated code !
e A#;AQm //}}AFX_MSG
T3k#VNH DECLARE_MESSAGE_MAP()
4A_[PM };
A1.7O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
#6+@M BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
b/C`Jp BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~c %hWt BOOL InitHotkey();
Uc@Ao: BOOL UnInit();
0l-Ef1 #endif
{\c(ls{ i*#-I3 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Yy)tmq #include "stdafx.h"
`/EGyN6X #include "hook.h"
w+1|9Y #include <windowsx.h>
A^)?Wt%* #ifdef _DEBUG
0V'nK V"| #define new DEBUG_NEW
Mf&{7% #undef THIS_FILE
Fsif6k=4 static char THIS_FILE[] = __FILE__;
rvXWcu -" #endif
K95p>E`9e #define MAX_KEY 100
SjwyLc #define CTRLBIT 0x04
cp#JBHO #define ALTBIT 0x02
A?-oL=' #define SHIFTBIT 0x01
yIDD@j=l #pragma data_seg("shareddata")
J6L K HHOOK hHook =NULL;
DX"xy UINT nHookCount =0;
i`dCG[ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
w*oQ["SL static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
9983aFam static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
uF1~FKB static int KeyCount =0;
@U3Vc|
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
b\-&sM(W" #pragma data_seg()
f]JM / HINSTANCE hins;
K }Vv4x1U void VerifyWindow();
rL+!tH BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
]3KhgK%c8 //{{AFX_MSG_MAP(CHookApp)
CS==A57I // NOTE - the ClassWizard will add and remove mapping macros here.
Gu2P\I2zx // DO NOT EDIT what you see in these blocks of generated code!
&8l%T'gd //}}AFX_MSG_MAP
eS<lwA_ END_MESSAGE_MAP()
@8;W \L$~1 3b+d"`Y^S CHookApp::CHookApp()
9Hc$G{[a {
$!8-? ?ML // TODO: add construction code here,
5A
sP5 // Place all significant initialization in InitInstance
,!7 H]4Qx }
1e&QSzL h $L/<3oP6 CHookApp theApp;
;uwRyd LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#m{UrTC {
|aT| l^2R@ BOOL bProcessed=FALSE;
UG'9*(* if(HC_ACTION==nCode)
#ZYVc|sT+ {
5ZMR,SZhC if((lParam&0xc0000000)==0xc0000000){// Key up
G|(
]bvJ? switch(wParam)
-5I2ga {
2Fq<*pxAY
case VK_MENU:
BPdfYu,il MaskBits&=~ALTBIT;
34d3g break;
l,,>& F case VK_CONTROL:
Bc6|n :;u MaskBits&=~CTRLBIT;
}RwSp!}C break;
S%yd5<%_ case VK_SHIFT:
DR c)iE>@ MaskBits&=~SHIFTBIT;
}lfnnK# break;
rfNm&!K default: //judge the key and send message
:j]vf8ec break;
WnGGo'Z }
}jVSlCF@t for(int index=0;index<MAX_KEY;index++){
)e a :Q? if(hCallWnd[index]==NULL)
(Nx;0"5IX continue;
h\PHKC2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ee3hG2d` {
op6CA "w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
1. rj' bProcessed=TRUE;
@ ]/AjjLt }
%Mk0QKzUo }
/ew
Ukc8, }
#1c_ev H else if((lParam&0xc000ffff)==1){ //Key down
H
Ge0hl[n switch(wParam)
DM}YJ {
*{yK
8 case VK_MENU:
{6~l$ MaskBits|=ALTBIT;
^d~1E Er break;
Pri`K/ case VK_CONTROL:
4Rvf MaskBits|=CTRLBIT;
Oh'Y0_oB> break;
%7gkNa case VK_SHIFT:
R0L&*Bjm MaskBits|=SHIFTBIT;
av$/Om: break;
;~\MZYs3m default: //judge the key and send message
[&nh5|f break;
DBCK2PlJ }
"Q?k'^@ for(int index=0;index<MAX_KEY;index++)
l"2OP6d {
'ul~7h;n if(hCallWnd[index]==NULL)
Ygl%eP%Z continue;
}C#;fp"L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
UGuxV+Nwf {
x
>^Si/t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
JM\m)RH0 bProcessed=TRUE;
r%.do;5 }
sRrzp=D }
|"9 #bU }
i}o[- S4 if(!bProcessed){
! ykx^z for(int index=0;index<MAX_KEY;index++){
9$|Gfyv if(hCallWnd[index]==NULL)
vsr[ur[eP continue;
cg*)0U-_( if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
a(v>Q*zNP SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/Ne<V2AX }
W@Lu;g.Yc }
?HV`|
Cw }
!V,{_(LT return CallNextHookEx( hHook, nCode, wParam, lParam );
{FG|\nPw }
EoxQ
*/ a\:VREKj, BOOL InitHotkey()
kJ-*fe'S {
8krpowVs~ if(hHook!=NULL){
cPU/tkc nHookCount++;
^>N]H>0'S return TRUE;
'qF#<1& }
L[20m(6? else
NbGV1q'] hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
|R#"Th6mH! if(hHook!=NULL)
BYo/57&: nHookCount++;
nYa*b=[. return (hHook!=NULL);
-atGlu2 }
^+m+zd_ BOOL UnInit()
i6 (a@KRY {
O=dJi9;`#_ if(nHookCount>1){
A6pjRxg nHookCount--;
LI6hEcM= return TRUE;
Wf&W^Q }
sPb=82~z BOOL unhooked = UnhookWindowsHookEx(hHook);
`QUy;%+ if(unhooked==TRUE){
4)<~4 ' nHookCount=0;
(Gw,2-A hHook=NULL;
@bnG:np }
K&U7H: return unhooked;
`/MvQ/ }
\a=D DVkB$2] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
FA}_(Hf.[ {
.LuB\o$ BOOL bAdded=FALSE;
en:4H for(int index=0;index<MAX_KEY;index++){
aKd+CO: if(hCallWnd[index]==0){
5n
^TRB hCallWnd[index]=hWnd;
QlHd,w HotKey[index]=cKey;
6"D/xV3Z HotKeyMask[index]=cMask;
Zb134b' bAdded=TRUE;
^+1#[E KeyCount++;
Q26qNn
bK break;
LT,? $I }
'D%w|Pe?Q }
WMBm6?54 return bAdded;
(
&frUQm }
=Mb1o[ (} 5S BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h#hxOVl%x {
5 XA=G BOOL bRemoved=FALSE;
I6s3+x;O for(int index=0;index<MAX_KEY;index++){
5&e<#" if(hCallWnd[index]==hWnd){
`WOYoec
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
yj$TPe_BW hCallWnd[index]=NULL;
ZDC9oX @ HotKey[index]=0;
bI y sl HotKeyMask[index]=0;
>R2SQA o bRemoved=TRUE;
d|*"IFe KeyCount--;
wV)}a5+ break;
s-7RW }
N*@aDM07 }
d.2mT?`# }
v i)%$~ return bRemoved;
PccB] }
3J=Y9 } dna6QV>A void VerifyWindow()
Bs MuQ|! {
NcAp_q?
4 for(int i=0;i<MAX_KEY;i++){
k3t78Qg if(hCallWnd
!=NULL){ D>!6,m2
if(!IsWindow(hCallWnd)){ n3`&zY
hCallWnd=NULL; SgEBh
HotKey=0; tL+OCLF;
HotKeyMask=0; : ~ A%#
KeyCount--; z 8*8OWM
} 0K-*WQ*#9
} \@;\t7~
} '/I:^9
} n6(.{M;
tdF9NFMD
BOOL CHookApp::InitInstance() A~dQ\M
{ L}yyaM)
AFX_MANAGE_STATE(AfxGetStaticModuleState()); gBf4's
hins=AfxGetInstanceHandle(); $) 5Bf3P0
InitHotkey(); c=6Q%S
return CWinApp::InitInstance(); $j5,%\4<
} +]@Az.E
cM_Fp
int CHookApp::ExitInstance() S',9g4(5
{ K"V:<a
VerifyWindow(); aRc '
UnInit(); ) ){xlFA}
return CWinApp::ExitInstance(); sIl33kmv
} |Cdvfk
Kwhdu<6
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {R^'=(YFy
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sgr=w+",Q
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %ObD2)s6:^
#if _MSC_VER > 1000 3[XQR8o
#pragma once [Lp,Hqi5
#endif // _MSC_VER > 1000 ^MmC$U^n
%Z8vdU# l
class CCaptureDlg : public CDialog M]-VHI[&W
{ K{l5m{:%
// Construction j4R 4H;
public: L}j0a> =x4
BOOL bTray; \NqEw@91B
BOOL bRegistered; `E\imL
BOOL RegisterHotkey(); cW``M.d'F
UCHAR cKey; w#^U45y1v
UCHAR cMask; .!}hhiF,Z
void DeleteIcon(); /i)Hb`(S
void AddIcon(); K"2|[ 5
UINT nCount; Uw<&Wm`'
void SaveBmp(); x>~p;z#VX
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~B$b)`*
// Dialog Data Y1dVM]l
//{{AFX_DATA(CCaptureDlg) B/"2.,
enum { IDD = IDD_CAPTURE_DIALOG }; _iEj
CComboBox m_Key; gq5qRi`q
BOOL m_bControl; $A$@|]}p
BOOL m_bAlt; 1IgHc.s
BOOL m_bShift; t?^9HP1b_
CString m_Path; M_``'gw
CString m_Number; OSzjK7:
//}}AFX_DATA 2BzqY`O
// ClassWizard generated virtual function overrides $cVi;2$p
//{{AFX_VIRTUAL(CCaptureDlg) @1R8-aa-r
public: w.N,)]h
virtual BOOL PreTranslateMessage(MSG* pMsg); }xlKonk
protected: T[Pa/j{
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s{/qS3=
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :o"8MZp
//}}AFX_VIRTUAL MF[z-7
// Implementation V8O.3fo`[`
protected: Ih1|LR/c
HICON m_hIcon; #\bP7a+
// Generated message map functions XtBMp=7Oa
//{{AFX_MSG(CCaptureDlg) y7<&vIEC
virtual BOOL OnInitDialog(); Napf"Av
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2@vj!U 8
afx_msg void OnPaint(); W>spz~w%j
afx_msg HCURSOR OnQueryDragIcon(); eFTX6XB:i
virtual void OnCancel(); 6(sIYZ2yq
afx_msg void OnAbout(); v&3O&y/1v
afx_msg void OnBrowse(); }iIbcA
afx_msg void OnChange(); `eRLc}aP2
//}}AFX_MSG g$j6n{Yl
DECLARE_MESSAGE_MAP() qvt-
}; /f1'm@8;
#endif *rqm8z50a
R#4^s
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2r];V'r
#include "stdafx.h" zL s^,x
#include "Capture.h" j.3o W
#include "CaptureDlg.h" ,2 WH/"
#include <windowsx.h> m%QqmTH
#pragma comment(lib,"hook.lib") #1$}S=8*f
#ifdef _DEBUG r9ke,7?
#define new DEBUG_NEW iilyw_$H
#undef THIS_FILE ;Mj002.\G
static char THIS_FILE[] = __FILE__; wVi%oSfM
#endif :G'xi2bs
#define IDM_SHELL WM_USER+1 DM3B]Yl
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U q X1E
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vW' 5` %
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; b2h":G|s
class CAboutDlg : public CDialog >uHS[ _`nM
{ F,G,b
public: Fc0jQ@4=
CAboutDlg(); pH9HK
// Dialog Data h'^FrWaU/
//{{AFX_DATA(CAboutDlg) N"DY?6
enum { IDD = IDD_ABOUTBOX }; a]1i/3/
//}}AFX_DATA !=[uT+v
// ClassWizard generated virtual function overrides 7tH]*T9e>
//{{AFX_VIRTUAL(CAboutDlg) {e]NU<G ,
protected: ,VD6s!(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <<3+g"enno
//}}AFX_VIRTUAL 2ALj}
// Implementation 7o{*Z
protected: "@/ba!L+
//{{AFX_MSG(CAboutDlg) v`)m">e*w
//}}AFX_MSG Bt>}LLBS2
DECLARE_MESSAGE_MAP() DY><qk
}; =aow
d4t
Um
;kd
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Mr6E/7g%
{ C<he4n.
//{{AFX_DATA_INIT(CAboutDlg) K[?R[
//}}AFX_DATA_INIT KCXw n
} R!{7OkC
f]}}yBte`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) oofFrAaT
{ J>v$2?w`w
CDialog::DoDataExchange(pDX); .]Ybp2`"U
//{{AFX_DATA_MAP(CAboutDlg) v#=ayWgk
//}}AFX_DATA_MAP n0.8)=;2
} rrQ0qg
X^in};&d
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Pi%tsKk%
//{{AFX_MSG_MAP(CAboutDlg) `?SG XXC
// No message handlers w67xl
//}}AFX_MSG_MAP 8Nvr93T,
END_MESSAGE_MAP() E:Y:X~vy
LrM}?9'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y}/jR6hK
: CDialog(CCaptureDlg::IDD, pParent) Q=.g1$LP
{ * NMQ
//{{AFX_DATA_INIT(CCaptureDlg) aBCOGtf
m_bControl = FALSE; q<}PM
m_bAlt = FALSE; d5, FM
m_bShift = FALSE; 7l}~4dm2J
m_Path = _T("c:\\"); n.;3X
m_Number = _T("0 picture captured."); #J.u
nCount=0; R+^z y"~
bRegistered=FALSE; oWcACs3fB
bTray=FALSE; yGV{^?yoP
//}}AFX_DATA_INIT X'2Gi
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 JfKg_&hM
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jI#z/a!j:
} t/Z!O
z6ZE
P7 8uq
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Bi_J5 If
{ |Y4q+sDW
CDialog::DoDataExchange(pDX); dKe@JQ+-z
//{{AFX_DATA_MAP(CCaptureDlg) x=3I)}J(kn
DDX_Control(pDX, IDC_KEY, m_Key); Ij$)RSPtH
DDX_Check(pDX, IDC_CONTROL, m_bControl); ]xB6cPdLu
DDX_Check(pDX, IDC_ALT, m_bAlt); {Vl"m2
DDX_Check(pDX, IDC_SHIFT, m_bShift); SbJh(V-pr
DDX_Text(pDX, IDC_PATH, m_Path); ]1Qi=2'
DDX_Text(pDX, IDC_NUMBER, m_Number); ;5RIwD
//}}AFX_DATA_MAP y(a}IM3~
} 9R:(^8P8
VLd=" ~
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %jgg59
//{{AFX_MSG_MAP(CCaptureDlg) Z>HNe9pr
ON_WM_SYSCOMMAND() 6+#,=!hF{
ON_WM_PAINT() (6[Wr}SW5
ON_WM_QUERYDRAGICON() (\q[gyR
ON_BN_CLICKED(ID_ABOUT, OnAbout) 67
O<*M
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &`sR){R
ON_BN_CLICKED(ID_CHANGE, OnChange) {9:hg9;E*
//}}AFX_MSG_MAP L3>4t: 8
END_MESSAGE_MAP() (o{)>D
-~]^5aa5n
BOOL CCaptureDlg::OnInitDialog() 4i96UvkZ
{ q]?+By-0
CDialog::OnInitDialog(); [R$liN99z;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }Y$VB%&Hy
ASSERT(IDM_ABOUTBOX < 0xF000); W#Cq6N
CMenu* pSysMenu = GetSystemMenu(FALSE); }amE6
if (pSysMenu != NULL) *hl<Y,W(
{ =KW|#]RB^
CString strAboutMenu; k^yy$^=<
strAboutMenu.LoadString(IDS_ABOUTBOX); a~F u
if (!strAboutMenu.IsEmpty()) C0f[eA
{ (aBP|rxg
pSysMenu->AppendMenu(MF_SEPARATOR); 'iDu0LX
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (T;1q^j
} ?bCTLt7k
} ]N_140N~
SetIcon(m_hIcon, TRUE); // Set big icon zPA>af~Ej
SetIcon(m_hIcon, FALSE); // Set small icon uyvs kz\
m_Key.SetCurSel(0); l85CJ+rg
RegisterHotkey(); .>oM
z&
CMenu* pMenu=GetSystemMenu(FALSE); 3?]S,~!F
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I@c0N*(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~EPjZ3 ?
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s!=!A
return TRUE; // return TRUE unless you set the focus to a control }K+\8em
} ~JT lPU'
H|'$dO)W
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) i|[S5QXCh
{ fV v$K&
if ((nID & 0xFFF0) == IDM_ABOUTBOX) /.f!
{ ?~]>H A:
CAboutDlg dlgAbout; }"g@E-]N
dlgAbout.DoModal(); dfXV1B5
} q
w"e0q% )
else G+;g:_E=
{ @D2`*C9
CDialog::OnSysCommand(nID, lParam); <,#rtVO$
} 5@""_n&FV
} yW'BrTw
%{c2lyw
void CCaptureDlg::OnPaint() N_|YOw6
{ EsS!07fAM:
if (IsIconic()) rjt O`Mt`
{ PwRNBb}6
CPaintDC dc(this); // device context for painting M~#5/eRX
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x%ZiE5#
// Center icon in client rectangle `~sf}S
:
int cxIcon = GetSystemMetrics(SM_CXICON); KF*B
int cyIcon = GetSystemMetrics(SM_CYICON); d9ZDpzxB
CRect rect; 7=AO^:=bx
GetClientRect(&rect); C[^a/P`i
int x = (rect.Width() - cxIcon + 1) / 2; ?T~3B]R
int y = (rect.Height() - cyIcon + 1) / 2; )vxVg*.Ee
// Draw the icon 30e(4@!4vW
dc.DrawIcon(x, y, m_hIcon); vBV"i9n
} mq>*W'M
else -_:JQ
{ (d1V1t2r6
CDialog::OnPaint(); 5Xla_@WLW
} oM m/!Dc
} zX006{vig
Ebmqq#SHjX
HCURSOR CCaptureDlg::OnQueryDragIcon() InTKdr^ P
{ R?i-"JhW
return (HCURSOR) m_hIcon; 0R.Gjz*Q
} Nj"_sA
p
ZzSJm+&'
void CCaptureDlg::OnCancel() `1DU b7<
{ c|8KT
if(bTray) P1vF{e
DeleteIcon(); k B$lkl\C
CDialog::OnCancel(); *NKC\aV`0
} Y>c5:F;
.f [\G*
void CCaptureDlg::OnAbout() h?M'7Lti
{ bt.K<Y0
CAboutDlg dlg; $Ykp8u,(
dlg.DoModal(); U*c{:K-C
} jFK9?cLT
uT@8 _9
void CCaptureDlg::OnBrowse() xQcMQ{&;
{ b3jU~L$
CString str; }6b7a1p
BROWSEINFO bi; 5[0l08'D
char name[MAX_PATH]; \Mh4X`<e
ZeroMemory(&bi,sizeof(BROWSEINFO)); _,Io(QS
bi.hwndOwner=GetSafeHwnd(); gb ^UFD L
bi.pszDisplayName=name; 70I4-[/z[d
bi.lpszTitle="Select folder"; A_8`YN"Xk
bi.ulFlags=BIF_RETURNONLYFSDIRS; `RL(N4H
LPITEMIDLIST idl=SHBrowseForFolder(&bi); $/-wgyP3m+
if(idl==NULL) gDjd{+LUo
return; @vDgpb@TM
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1-ndJ@Wlz
str.ReleaseBuffer(); c9/
'i
m_Path=str; =[O<.'aG-
if(str.GetAt(str.GetLength()-1)!='\\') FeincZ!M
m_Path+="\\"; >(YPkmH
UpdateData(FALSE); ~Y}Z4" o
} mw%[qeLV
fM
zAf3
void CCaptureDlg::SaveBmp() P,LXZ
{ I NFzX
CDC dc; ph5xW<VNP
dc.CreateDC("DISPLAY",NULL,NULL,NULL); P+D|_3j
CBitmap bm; MWp\D#H
int Width=GetSystemMetrics(SM_CXSCREEN); Mf,Mcvs
int Height=GetSystemMetrics(SM_CYSCREEN); h1D~AgZOVj
bm.CreateCompatibleBitmap(&dc,Width,Height); *]DJAF]
CDC tdc; XJV3oj
tdc.CreateCompatibleDC(&dc); 2Q;Y@%G
CBitmap*pOld=tdc.SelectObject(&bm); Bwi[qw
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rVIb'sa
tdc.SelectObject(pOld); /s-jR]#VA
BITMAP btm; 5O4&BxQ~}
bm.GetBitmap(&btm); q#':aXcv"
DWORD size=btm.bmWidthBytes*btm.bmHeight; -;DE&~p
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "|~B};|MFF
BITMAPINFOHEADER bih; EZa{C}NQ$2
bih.biBitCount=btm.bmBitsPixel; QL|:(QM
bih.biClrImportant=0; E|6Z]6[
bih.biClrUsed=0; {?kKpMNNn
bih.biCompression=0; :@z5& h
bih.biHeight=btm.bmHeight; *X=f
bih.biPlanes=1; \?Oly171
bih.biSize=sizeof(BITMAPINFOHEADER); 'KIi!pA.
bih.biSizeImage=size; ,nuDoc
bih.biWidth=btm.bmWidth; .\hib.n3
bih.biXPelsPerMeter=0; { <ao4w6B
bih.biYPelsPerMeter=0; "ZK5P&d
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *<h
static int filecount=0; <8xP-(wk;
CString name; McMK|_H
name.Format("pict%04d.bmp",filecount++); _<' kzOj
name=m_Path+name; Vzv.e6_
BITMAPFILEHEADER bfh; }Rf:DmPE
bfh.bfReserved1=bfh.bfReserved2=0; "Ee/q :`
bfh.bfType=((WORD)('M'<< 8)|'B'); c`N`xU+z
bfh.bfSize=54+size; ]$`s}BN
bfh.bfOffBits=54; {D_4~heF
CFile bf; * y"GgI
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Ar{=gENn
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vNwSZ{JBd
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ;@ ! d!&
bf.WriteHuge(lpData,size); S0o,)`ZB
bf.Close(); \gk3w,B?E
nCount++; )v$Cv|"
} PezWc18
GlobalFreePtr(lpData); /x"pj3
if(nCount==1) +#*z"a`
m_Number.Format("%d picture captured.",nCount); \~1zAiSd>#
else dXcMysRc%&
m_Number.Format("%d pictures captured.",nCount); N<i Vs
UpdateData(FALSE); VRN9 yn2
} /dP8F
|LGNoP}SA
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zR/p}Wu|!
{ MZ+IorZl
if(pMsg -> message == WM_KEYDOWN) '[ddE!ta
{ t>=y7n&q
if(pMsg -> wParam == VK_ESCAPE) 2g07wJ6x
return TRUE; laRKt"A
if(pMsg -> wParam == VK_RETURN) (NWN&
return TRUE; e4_aKuA
} W3-Rs&se
return CDialog::PreTranslateMessage(pMsg); &oEq&
} i:Ct6[
qt&"cw
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) JSZj0_B
{ 5FR#_}k]_F
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \?ws0Ax
SaveBmp(); X52jqXjg
return FALSE; 4lKbw4[a
}
J5_
qqD)
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &CP@]
pi9L
CMenu pop; KD3To%
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :?XHZ
CMenu*pMenu=pop.GetSubMenu(0); eR
2T<7G
pMenu->SetDefaultItem(ID_EXITICON); JFk|Uqs(
CPoint pt; _q 9lr8hx
GetCursorPos(&pt); q,>F#A'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); WD do{
if(id==ID_EXITICON) z#
?w/NE
DeleteIcon(); y Q @=\'
else if(id==ID_EXIT) EqDYQ
7
OnCancel(); u9^;~i,
return FALSE; qQRYHo>/e
} *UxB`iA
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bOGDz|H``
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Ch!Q? 4
AddIcon(); g~["O!K3
return res; 9@EnmtR
} :/[ZgreN6
J?ZVzKTb>}
void CCaptureDlg::AddIcon() Pds*M?&F
{ 4qXUk:C@m
NOTIFYICONDATA data; r[4F?W
data.cbSize=sizeof(NOTIFYICONDATA); 9: |K]y
CString tip; $YQ&\[pDA
tip.LoadString(IDS_ICONTIP); O]LuL&=s y
data.hIcon=GetIcon(0); 3\.)y49,1
data.hWnd=GetSafeHwnd(); 3a[(GW _
strcpy(data.szTip,tip); 64j 4P 7
data.uCallbackMessage=IDM_SHELL; ovo I~k'
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eii7pbc
data.uID=98; m%(JRh
Shell_NotifyIcon(NIM_ADD,&data); `A{~}6jw
ShowWindow(SW_HIDE); )Ua2x@j'C@
bTray=TRUE; z4+6k-#):
} p00Bgo
]4~D;mv
void CCaptureDlg::DeleteIcon() M!XFb
{ _SW a3O#'
NOTIFYICONDATA data; hG HzO
data.cbSize=sizeof(NOTIFYICONDATA); Llc|j&yHQ
data.hWnd=GetSafeHwnd(); >f05+%^[
data.uID=98; pXlBKJmW
Shell_NotifyIcon(NIM_DELETE,&data); qtwmTT)
ShowWindow(SW_SHOW); _~q^YZ
SetForegroundWindow(); \$|UFx
ShowWindow(SW_SHOWNORMAL); _qo1 GM&
bTray=FALSE; nt`l6b
} RSeezP6#
H 6<@
void CCaptureDlg::OnChange() uvM88#
{ `B0*/ml
RegisterHotkey(); DL!s)5!M
} LZ]pyoi
hQxe0Pdt
BOOL CCaptureDlg::RegisterHotkey() z ate%y
{ zO]dQ$r\Z
UpdateData(); Q&a<9e&
UCHAR mask=0; d~$t{46
UCHAR key=0; SLB iQd.
if(m_bControl) \>dG'
mask|=4; ?0&>?-?
if(m_bAlt) rzj'!~>U
mask|=2; >c>ar>4xF
if(m_bShift) w%H#>k
mask|=1; G7JZP T
key=Key_Table[m_Key.GetCurSel()]; ne*aC_)bT
if(bRegistered){ 6FFv+{2^@
DeleteHotkey(GetSafeHwnd(),cKey,cMask); iW$i%`>
bRegistered=FALSE; RIc<
} l7um9@[4
cMask=mask; ;.a)r
cKey=key; 8rNxd=!
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); PelV67?M
return bRegistered; #(4hX6?5AI
} MT g Eq
}`]^LFU5
四、小结 $&C%C\(>D
@V u[Tg}J
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。