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:
zdm2`D;~p
Cu!]-c{ 一、实现方法
}3_> 7"F29\ 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:
a 7685Y j^%N:BQ& #pragma data_seg("shareddata")
\ef:H&r HHOOK hHook =NULL; //钩子句柄
^HxIy;EQ<z UINT nHookCount =0; //挂接的程序数目
I1Otu~%d static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
yfal'DqKF static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
*E]:VZl
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
+D2I~hC0' static int KeyCount =0;
W>5[_d static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
TbaZFLr #pragma data_seg()
\!xCmQ o7s!ti\G 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。
5YneoM]Q >7PNl\=gG 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:
K?Sy?Kz dyk(/#*7W BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
)N*Jc @Y@ cKey,UCHAR cMask)
Mo5b
@
[ {
}m'n1tm;
BOOL bAdded=FALSE;
f!{@{\ for(int index=0;index<MAX_KEY;index++){
Ch\__t*v! if(hCallWnd[index]==0){
":f]egq
- hCallWnd[index]=hWnd;
uXk] HotKey[index]=cKey;
fY6~Z
BvK HotKeyMask[index]=cMask;
(k8}9[3G bAdded=TRUE;
+H28 F_# KeyCount++;
G{I),Y~IF break;
wSw> UU }
6']HmM }
)XHn.>]nc return bAdded;
U
E$Ix }
XMiu}w! //删除热键
lB0`|UEb ( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0)M8Tm0$ {
R8_I ASs BOOL bRemoved=FALSE;
'y=N_/+s for(int index=0;index<MAX_KEY;index++){
GGf<9!: if(hCallWnd[index]==hWnd){
Le:(;:eL>t if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
N/ f7"~+` hCallWnd[index]=NULL;
6]4#8tR1_ HotKey[index]=0;
/M+Du, HotKeyMask[index]=0;
+V Nk#Z i bRemoved=TRUE;
=~k
c7f{ KeyCount--;
9?8PMh. break;
b+|3nc! }
2:_6nWl }
=#v? }JG }
mBE&>}G< return bRemoved;
P#,;)HF }
*yaS^k\ :W5W
@8Y _CfJ Kp) DLL中的钩子函数如下:
g`%in cP D_=.& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&w#! {
j:xC\b47" BOOL bProcessed=FALSE;
iaCV8`&q% if(HC_ACTION==nCode)
0 ZM(heQ {
b>Y{,`E3 if((lParam&0xc0000000)==0xc0000000){// 有键松开
R(`:~@3\6 switch(wParam)
!?(7g2NP) {
tAF?.\x"g case VK_MENU:
7@
) MaskBits&=~ALTBIT;
OQ7 `n<I<) break;
m3TR}=n case VK_CONTROL:
z9*e%$+S MaskBits&=~CTRLBIT;
:nQlS break;
I O:*F0 case VK_SHIFT:
h%krA<G9 MaskBits&=~SHIFTBIT;
w4vV#C4X break;
Rd&DH_<+^ default: //judge the key and send message
'*`#xNu[ break;
@p
L9a1PJv }
>WIc"y. for(int index=0;index<MAX_KEY;index++){
m3gv %h if(hCallWnd[index]==NULL)
G[A3H>
> continue;
o87kF!x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%VH, (}i {
nuXL{tg6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}:Gs , bProcessed=TRUE;
sVK?sBs] }
o`,~#P| }
iN[x
*A|h }
!R"W2 Z4h else if((lParam&0xc000ffff)==1){ //有键按下
2S{P(B switch(wParam)
1^4:l!0D {
,VHqZ'6 case VK_MENU:
@kqxN\DE MaskBits|=ALTBIT;
?9kC[4G break;
BG+i tyH case VK_CONTROL:
$2Whb!7Z( MaskBits|=CTRLBIT;
4P&2Z0 break;
"FWx;65CR case VK_SHIFT:
u3C_Xz MaskBits|=SHIFTBIT;
RqtBz3v break;
l! F$V;R default: //judge the key and send message
BVw2skOT break;
RZzHlZ }
n7cy[%yT for(int index=0;index<MAX_KEY;index++){
ch8a if(hCallWnd[index]==NULL)
~w+I2oS$ continue;
];OvV ,* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gvA}s/ {
-2M~KlYl SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S^eem_C bProcessed=TRUE;
x9vSekV }
G}fBd }
@kWL "yy, }
+e-F`k if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
x#J9GP. for(int index=0;index<MAX_KEY;index++){
gSz<K.CT if(hCallWnd[index]==NULL)
x9"Cm;H% continue;
HOR8Jwf: if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9{*{Ba SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
P.'.KZJ:WD //lParam的意义可看MSDN中WM_KEYDOWN部分
@up,5` }
%.Ma_4o
Z }
rm8Ys61\= }
+;?mg(: return CallNextHookEx( hHook, nCode, wParam, lParam );
>
S>*JP }
q 84*5- FH+X< 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:
5To@d|{ Y~WdN<g BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v Y0bK- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~5f&<,p! \8 `7E1d 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:
>>y`ap2%V H<(F$7Q!\ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
68Fl/
{
j
uA@"SG if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
\c<
oVF' {
fF(2bVKP: //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
;
oyV8P$ SaveBmp();
|ia5Mr"t return FALSE;
eV[{c %wN: }
;6W ]f([ …… //其它处理及默认处理
&h-_|N }
MJ|tfQwhx wJy]Vyd C !j3@EZ$ 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。
"do5@$p| 3iCe5VF 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
S,c{LTL 42NfD/"g+s 二、编程步骤
L ;L: c/|{yp$Ga> 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";
*;fTiL IT| h;NUG 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
L4>14D\ q)?%END 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;
?UtKu A2|Bbqd 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;
KD kGQh#9 V<QpC5 5、 添加代码,编译运行程序。
~}.C*;J x?Abk 三、程序代码
y, l[v39 |_;kQ(, ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
>Xn,jMUW #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
D+]mKPB #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
q+?&w'8 #if _MSC_VER > 1000
a*P v^Np-v #pragma once
>C0B!MT?3% #endif // _MSC_VER > 1000
16iTE-J_ #ifndef __AFXWIN_H__
UPhO=G #error include 'stdafx.h' before including this file for PCH
JW
D`} #endif
y%TqH\RKv #include "resource.h" // main symbols
Kxsd@^E class CHookApp : public CWinApp
zg2d}"dV {
aTvyzr1 public:
oGcgd$%ZB CHookApp();
_Xf1FzF+a // Overrides
U,WOP7z // ClassWizard generated virtual function overrides
N[_T3( //{{AFX_VIRTUAL(CHookApp)
7{#p'.nc5 public:
$--8%gh dG virtual BOOL InitInstance();
q8{Bx03m6 virtual int ExitInstance();
j1_>>xB //}}AFX_VIRTUAL
,}t%7I //{{AFX_MSG(CHookApp)
.I`>F/Sjr // NOTE - the ClassWizard will add and remove member functions here.
O*u
// DO NOT EDIT what you see in these blocks of generated code !
%J*1F //}}AFX_MSG
Q9bnOvKe| DECLARE_MESSAGE_MAP()
xA3_W };
n!4}Hwz! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
T9yI%;D BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
PaTOlHr BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$DDO9 BOOL InitHotkey();
lQIg0G/3 BOOL UnInit();
mB`HPT #endif
D?KLV_Op NS[ Z@@ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7!M; ?Y #include "stdafx.h"
gq('8*S #include "hook.h"
?p{-Yp*h #include <windowsx.h>
{]IY;cL #ifdef _DEBUG
rmjuNy=( #define new DEBUG_NEW
=oSD)z1c?x #undef THIS_FILE
+L 09^I static char THIS_FILE[] = __FILE__;
Ftyxz&-4$p #endif
zZ[kU1Fyv #define MAX_KEY 100
so` \e^d #define CTRLBIT 0x04
Xe4 #define ALTBIT 0x02
3o rSk #define SHIFTBIT 0x01
Hcf"u&% #pragma data_seg("shareddata")
gW~YB2 $ HHOOK hHook =NULL;
a!o%x UINT nHookCount =0;
rCo}^M4Pb static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
b'O/u."O static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[r2V+b.C static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
>l0Qd1 static int KeyCount =0;
8(? &=>@ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
g0 Q,]\~ #pragma data_seg()
(6fD5XtS HINSTANCE hins;
nS]e void VerifyWindow();
$?ss5:
S BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
;1~ n|IY //{{AFX_MSG_MAP(CHookApp)
YMo8C( // NOTE - the ClassWizard will add and remove mapping macros here.
6GuTd // DO NOT EDIT what you see in these blocks of generated code!
FO>?>tK 0 //}}AFX_MSG_MAP
<8(q. END_MESSAGE_MAP()
BiU>h.4=\( >FeCa
hFn CHookApp::CHookApp()
HDhkg-QC {
OsOfo({I_ // TODO: add construction code here,
+wj}x?ZeV // Place all significant initialization in InitInstance
OTYkJEC8\N }
H0b{`!'Fs: D{t_65c- CHookApp theApp;
13@emb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
:"y2u {
h7eb/xEto BOOL bProcessed=FALSE;
WReHep if(HC_ACTION==nCode)
n%WjU)< {
7jw+o*; if((lParam&0xc0000000)==0xc0000000){// Key up
uBG!R#T switch(wParam)
p63fpnH {
$JOtUB{ case VK_MENU:
y:E$n! MaskBits&=~ALTBIT;
Q0-gU+ig break;
U^}7DJ case VK_CONTROL:
?*
+>T@MH MaskBits&=~CTRLBIT;
I`+,I`~u break;
wKJ|;o4;L case VK_SHIFT:
.8'c
c8 MaskBits&=~SHIFTBIT;
-I4@6vE, break;
# ,H!<X;SS default: //judge the key and send message
r5Q#GY> break;
a,fcKe&B }
`j3 OFC{7E for(int index=0;index<MAX_KEY;index++){
xm=Gt$>.o if(hCallWnd[index]==NULL)
sw9ri}oc continue;
6lpJ+A57# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$J4)z&%dr {
a?ete9Q+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
InL_JobE8r bProcessed=TRUE;
N~b0 b;e }
Y{~`g(~9_A }
<0Y<9+g! }
GsO(\hR6^ else if((lParam&0xc000ffff)==1){ //Key down
Z6b]EcP)# switch(wParam)
D\;5{,:d {
g'!"klS93 case VK_MENU:
Fsl="RB7f MaskBits|=ALTBIT;
p/eaO{6 6 break;
fJNK@F case VK_CONTROL:
%INkuNa8\ MaskBits|=CTRLBIT;
y<HNAGj break;
o;DK]o>kH case VK_SHIFT:
e2fv% MaskBits|=SHIFTBIT;
\(`2 @ break;
HP7~Zn)c default: //judge the key and send message
7z{N} break;
Cj }H'k<B }
.p Mwa for(int index=0;index<MAX_KEY;index++)
:W>PKW`^ {
=i}lh}( if(hCallWnd[index]==NULL)
8,F|*YA continue;
Aua}.Fl, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1.N2!:&G| {
+tt!xfy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8*Fn02 p bProcessed=TRUE;
'5Kj"aD% }
+2tFX }
# bjK]+ }
l['p^-I if(!bProcessed){
M*cF'go for(int index=0;index<MAX_KEY;index++){
FbMtor if(hCallWnd[index]==NULL)
y5KeUMcu continue;
LRaO}-<b if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{2Ew^Li SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
:
Wtpg
}
MGK?FJn_? }
%TAS4hnu% }
,o0Kev z return CallNextHookEx( hHook, nCode, wParam, lParam );
kVCWyZh4 }
T12Zak4.= B1Pi+-t BOOL InitHotkey()
LPs5LE[Pm {
o\><e1P if(hHook!=NULL){
L%3Bp/`S nHookCount++;
$e4N4e2x/ return TRUE;
,cS_687o }
vgDpo@fz8 else
ZI4dD.B hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
F/1m&1t if(hHook!=NULL)
B#`'h~(7 nHookCount++;
SmvMjZ+7Y return (hHook!=NULL);
\1#]qs - }
W2v'2qAs BOOL UnInit()
Gj%q:[r {
4i&Rd1#0dI if(nHookCount>1){
8mLW^R:` nHookCount--;
UqsOG<L'6 return TRUE;
jAcKSx$}y" }
Q`.q,T8I BOOL unhooked = UnhookWindowsHookEx(hHook);
r|]YS6 if(unhooked==TRUE){
WrRY3X nHookCount=0;
BHU$QX hHook=NULL;
{jwLVKT$ }
x)N QRd return unhooked;
VR1[-OE
}
z6;hFcO oC}
u BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
q7_Ttjn-DV {
JC9$"0d7 BOOL bAdded=FALSE;
L^Q;M,.c; for(int index=0;index<MAX_KEY;index++){
<}'=@a if(hCallWnd[index]==0){
L<iRqayn hCallWnd[index]=hWnd;
9c*B%A8J HotKey[index]=cKey;
")txFe HotKeyMask[index]=cMask;
9LBZMQ bAdded=TRUE;
Dm}M8`|X KeyCount++;
4{vEW( break;
|N)),/R_ }
|*b-m k }
Q@PDhISa return bAdded;
]xoG{%vgb }
C4gES"T 34"PtWbV> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
G3]#Du {
Nmt~1.J BOOL bRemoved=FALSE;
5a@9PX^.J for(int index=0;index<MAX_KEY;index++){
~Ma r if(hCallWnd[index]==hWnd){
.m\0<8C if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.L;e:cvx hCallWnd[index]=NULL;
@OFxnF` HotKey[index]=0;
X6(s][Wn HotKeyMask[index]=0;
\G)F* bRemoved=TRUE;
9iM%kY#)W KeyCount--;
S3WUccv break;
Q (q&(/ }
cPAR.h,b? }
u^JsKG+,: }
rev*G: return bRemoved;
%yjD<2J; }
v[8+fd)}S wYV>Qd
Z void VerifyWindow()
uPYH3< {
< FO=PM for(int i=0;i<MAX_KEY;i++){
1kUlQ*[<| if(hCallWnd
!=NULL){ )u=W?5%=}
if(!IsWindow(hCallWnd)){ y5O &9Ckw
hCallWnd=NULL; 79d(UG'O
HotKey=0; ,=[%#gS
HotKeyMask=0; FY^Nn
KeyCount--; |S|'o*u
} [Y@>,B!V
} H|wP8uQC
} ]{\M,txo8
} 1(:!6PY
<;~u@^>
BOOL CHookApp::InitInstance() rcMf1\
{ y@LiUe5
AFX_MANAGE_STATE(AfxGetStaticModuleState()); es x/{j;<u
hins=AfxGetInstanceHandle(); xh9$ZavB*
InitHotkey(); >zL5*:G
return CWinApp::InitInstance(); m_Q&zp["
} _!,
J iOI
<Up?w/9
int CHookApp::ExitInstance() kmt1vV.9
{ bJD$!*r\%!
VerifyWindow(); ysp`(n=
UnInit(); ey4.Hj#T
return CWinApp::ExitInstance(); E!mv}
} 'x"(OdM:[
2=0HQXXrq
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8=joVbs
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) udLI AV*
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6j6;lNUc
#if _MSC_VER > 1000 fxr#T'i
#pragma once {N/%%O.b
#endif // _MSC_VER > 1000 sO6=w%l^
yrfV&C%=n
class CCaptureDlg : public CDialog r@Jy*2[-Jq
{ Yb/*2iWX
// Construction 9`Fw}yAt
public: s<k2vbhI
BOOL bTray; vPz7*w
BOOL bRegistered; *x;4::'Jn
BOOL RegisterHotkey(); ^IIy>
UCHAR cKey; v}V[sIs}
UCHAR cMask; h"0)spF"d
void DeleteIcon(); u5glKE
void AddIcon(); h !R=t
UINT nCount; ArNQ}F/
void SaveBmp(); "2sk1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor N8#j|yf
// Dialog Data 51#OlvD
//{{AFX_DATA(CCaptureDlg) +)e|>
enum { IDD = IDD_CAPTURE_DIALOG }; y;8&J{dd
CComboBox m_Key; N1Ag.
BOOL m_bControl; 6b'.WB]-
BOOL m_bAlt; >,]8iMh
BOOL m_bShift; *tEqu%N1'
CString m_Path; p&]V!O
CString m_Number; 1hGj?L0m.
//}}AFX_DATA X<[ qX*
// ClassWizard generated virtual function overrides |3@DCbT
//{{AFX_VIRTUAL(CCaptureDlg) 9_O4yTL
public: 23>[-XZb[O
virtual BOOL PreTranslateMessage(MSG* pMsg); lNa+NtQu
protected: 1nskf*Z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ihf :k_;
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); y*vSt^
//}}AFX_VIRTUAL PMB4]p%o
// Implementation ow3.jHsLA
protected: }shxEsq
HICON m_hIcon; /kkUEo+
// Generated message map functions /YF:WKr2
//{{AFX_MSG(CCaptureDlg) 'D
?o^
virtual BOOL OnInitDialog(); oR=i5lAU
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); l$/lbwi%
afx_msg void OnPaint(); wL
4Y%g
afx_msg HCURSOR OnQueryDragIcon(); '= fk;AiQ
virtual void OnCancel(); %60 OS3
afx_msg void OnAbout(); 0C/ZcfFU~
afx_msg void OnBrowse(); =huV(THU
afx_msg void OnChange(); .)!QsBU
//}}AFX_MSG *$NZi*z3
DECLARE_MESSAGE_MAP() xV5UaD<
}; y3s+.5;
#endif Ws@'2i\;
SNH 3C1
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L8PX SJ
#include "stdafx.h" tMiIlf!>p
#include "Capture.h" Ls9NQy
#include "CaptureDlg.h" cpltTJFg
#include <windowsx.h> ~RuX2u-2&u
#pragma comment(lib,"hook.lib") c!4F0(n4
#ifdef _DEBUG AT~,
#define new DEBUG_NEW E3wL n/<
#undef THIS_FILE M }d:B)cz
static char THIS_FILE[] = __FILE__; M[YFyM(
#endif A:r?#7 Ma
#define IDM_SHELL WM_USER+1 ~&73f7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "/i$_vl
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); - Fbp!*.
u
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YoKyiO!
class CAboutDlg : public CDialog +)j ll#}?
{ _q27
3QG/"
public: !EB<N<P"t
CAboutDlg(); hb5K"9Y
// Dialog Data ;J 5z
//{{AFX_DATA(CAboutDlg) x^f)I|t
enum { IDD = IDD_ABOUTBOX }; #lP8/-s^
//}}AFX_DATA ZLv/otf:|"
// ClassWizard generated virtual function overrides vv @m{,7#Y
//{{AFX_VIRTUAL(CAboutDlg) .="XvVdkp
protected: fq6%@M~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ==5F[UX
//}}AFX_VIRTUAL }bjZeh.
// Implementation FoyYWj?,R
protected: '{,xQf*x
//{{AFX_MSG(CAboutDlg) XZM3zlg*
//}}AFX_MSG `NsjtT'_
DECLARE_MESSAGE_MAP() p%"dYH%]&0
}; tUJRNEg
uPA
(1
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7mi!yTr}
{ ^QRg9s,T<
//{{AFX_DATA_INIT(CAboutDlg) |:=o\eu&
//}}AFX_DATA_INIT /8h=6"
} H0Pxw
P>q
Bvn3:+(47
void CAboutDlg::DoDataExchange(CDataExchange* pDX) neDXzMxF
{ G:=hg6'
CDialog::DoDataExchange(pDX); 3`HK^((o
//{{AFX_DATA_MAP(CAboutDlg) @0?!bua_|
//}}AFX_DATA_MAP } p'ZMj&
} ;hX( /T
vjGQ! xF
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0Z9DewwP
//{{AFX_MSG_MAP(CAboutDlg) Z .6dL
// No message handlers hi0HEm\
//}}AFX_MSG_MAP 8vY-bm,e
END_MESSAGE_MAP() >d 2Fa4u3
5~JT*Ny
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H$(bSw$
: CDialog(CCaptureDlg::IDD, pParent) zN4OrG0
{ Ic#xz;elM
//{{AFX_DATA_INIT(CCaptureDlg) JQ&t"`\k
m_bControl = FALSE; 2d !'9mA
m_bAlt = FALSE; i<m(neX[H
m_bShift = FALSE;
Pd*[i7zhC
m_Path = _T("c:\\"); #&&T1;z"#
m_Number = _T("0 picture captured."); _>;Wz7
nCount=0; !Lf<hS^
bRegistered=FALSE; V)`2Kw
bTray=FALSE; IY`p7 )#i
//}}AFX_DATA_INIT =?fz-HB
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~7P)$[
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W7i|uTM
} t;&XIG~
SiratkP9n7
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) SAx9cjj+
{ 9 E!le=>
CDialog::DoDataExchange(pDX); Sjpx G@k
//{{AFX_DATA_MAP(CCaptureDlg) kXMp()N8`
DDX_Control(pDX, IDC_KEY, m_Key); G'ykcB._
DDX_Check(pDX, IDC_CONTROL, m_bControl); :gh[BeqQ)
DDX_Check(pDX, IDC_ALT, m_bAlt); ?{{w[U6NE
DDX_Check(pDX, IDC_SHIFT, m_bShift); |cPHl+$nh.
DDX_Text(pDX, IDC_PATH, m_Path); o\IMYT
DDX_Text(pDX, IDC_NUMBER, m_Number); uepyH
//}}AFX_DATA_MAP Ey46JO"
} c3A\~tHW
|\5^ub,m
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0lfK}
a
//{{AFX_MSG_MAP(CCaptureDlg) >H2`4]4]
ON_WM_SYSCOMMAND() >ZgzE
ON_WM_PAINT() }h5i Tc
ON_WM_QUERYDRAGICON() )+E[M!34
ON_BN_CLICKED(ID_ABOUT, OnAbout) 1j<(?MT-
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {meX2Z4
ON_BN_CLICKED(ID_CHANGE, OnChange) nM
)C^$3<t
//}}AFX_MSG_MAP O !L`0
=%c
END_MESSAGE_MAP() VM"cpC_8
*Z5^WHwg
BOOL CCaptureDlg::OnInitDialog() [VCC+_
{ bLgH3[{
CDialog::OnInitDialog(); /:&!o2&1H
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); l>?c AB[
ASSERT(IDM_ABOUTBOX < 0xF000); p*Bty@CRi
CMenu* pSysMenu = GetSystemMenu(FALSE); hRcb}>pr
if (pSysMenu != NULL) c?p^!zG
{ g,ZA\R~
CString strAboutMenu; yBIlwN`kB
strAboutMenu.LoadString(IDS_ABOUTBOX); Y?T{>"_W
if (!strAboutMenu.IsEmpty()) _"DS?`z6
{ 4`IM[DIG~
pSysMenu->AppendMenu(MF_SEPARATOR); y7R#PkQ~
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mo0\t#jA
} o\AnM5
} $`=p]
SetIcon(m_hIcon, TRUE); // Set big icon f-=\qSo
SetIcon(m_hIcon, FALSE); // Set small icon 3dShznlf_*
m_Key.SetCurSel(0); fV(3RG
RegisterHotkey(); Lpchla$
CMenu* pMenu=GetSystemMenu(FALSE); pJpapA2l*6
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jcH@*c=%e
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nR!e(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); US6_5>/
return TRUE; // return TRUE unless you set the focus to a control 092t6D}
} R$a<=
\INH[X#>
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )*|/5wW1
{ P:qmg"i@3
if ((nID & 0xFFF0) == IDM_ABOUTBOX) !*IMWm>
{ ~}/Dl#9R!
CAboutDlg dlgAbout; l^B.iB
dlgAbout.DoModal(); E_HB[9
} Qy,^'fSN
else B~Q-V&@o
{ g;IlS*Ld
CDialog::OnSysCommand(nID, lParam); Y4T")
} )M*w\'M
} TQ
Vk;&A
2EY"[xK|
void CCaptureDlg::OnPaint() ?HZp@&
{ .=_p6_G
if (IsIconic()) eE;tiX/
{ -wlj;U
CPaintDC dc(this); // device context for painting 0ju1>.p
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q!c(~UVw
// Center icon in client rectangle <t%gl5}|
int cxIcon = GetSystemMetrics(SM_CXICON); 7*'/E#M
int cyIcon = GetSystemMetrics(SM_CYICON); MfTLa)Rz
CRect rect; #c!:&9oU
GetClientRect(&rect); Nz{dnV{&x;
int x = (rect.Width() - cxIcon + 1) / 2; rCyb3,W
int y = (rect.Height() - cyIcon + 1) / 2; OI R5QH
// Draw the icon ]n ?x tI
dc.DrawIcon(x, y, m_hIcon);
w-jElV
} 0MQ= Rt
else od;-D~
{ JuRoeq.
CDialog::OnPaint(); 'Pz%c}hJ
} ]AP1+
&9fN
} GnV0~?
<?jdNM
HCURSOR CCaptureDlg::OnQueryDragIcon() 93-Y(Xx)bY
{ XGlt^<`
return (HCURSOR) m_hIcon; F c[KIG3@
} $o"nTl
k<1yv$/mW
void CCaptureDlg::OnCancel() f49kf**
{ @|!4X(2
if(bTray) |J`EM7qMK
DeleteIcon(); 8$Q`wRt(%
CDialog::OnCancel(); l=^A41L_
} vccWe7rh
LyUn!zV$(
void CCaptureDlg::OnAbout() BEZ~<E&0H
{ \?bV\/GBR
CAboutDlg dlg; ,RP-)j"Wff
dlg.DoModal(); ^({)t
} >hKsj{=R7
P{L=u74b{x
void CCaptureDlg::OnBrowse() Nk~}aj
{ ` ]|X_!J-
CString str; UuG%5 ZC
BROWSEINFO bi; [f6uwp
char name[MAX_PATH]; U~
{k_'-i
ZeroMemory(&bi,sizeof(BROWSEINFO)); +^I0>\
bi.hwndOwner=GetSafeHwnd(); GqFx^dY4*
bi.pszDisplayName=name; ;yH>A ;,K%
bi.lpszTitle="Select folder"; CjdM*#9lW
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2 a<\4w'
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3WV(Ok
if(idl==NULL) ycGY5t@K@
return; |9@,ri\'Rg
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0SpB2>_
str.ReleaseBuffer(); h!"2Ux3!x
m_Path=str; 8K8u|]i
if(str.GetAt(str.GetLength()-1)!='\\') ~{x1/eH
m_Path+="\\"; ~% hdy@
UpdateData(FALSE); *miG<
} #ydold{F
#J5BHY~
void CCaptureDlg::SaveBmp() $+gQnI3w
{ Ht`fC|E
CDC dc; /iW+<@Mas
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]kh]l8t ^
CBitmap bm; Rq4;{a/j
int Width=GetSystemMetrics(SM_CXSCREEN); >Wg=
Tuef
int Height=GetSystemMetrics(SM_CYSCREEN); Y#U.9>h
bm.CreateCompatibleBitmap(&dc,Width,Height); T+8Yd(:hX
CDC tdc; ,n|si#
tdc.CreateCompatibleDC(&dc); <y 4(!z"
CBitmap*pOld=tdc.SelectObject(&bm); `RTxc
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tZxx#v`
tdc.SelectObject(pOld); -oD,F
$Rb
BITMAP btm; Bz+oMN#XJ
bm.GetBitmap(&btm); +sNS
DWORD size=btm.bmWidthBytes*btm.bmHeight; u#05`i:Z
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !_glZ*tL
BITMAPINFOHEADER bih; Q+CJd>B
bih.biBitCount=btm.bmBitsPixel; ; :e7Z^\/k
bih.biClrImportant=0; ! FcGa
bih.biClrUsed=0; KbJ6U75|f
bih.biCompression=0; ^0,}y]5p
bih.biHeight=btm.bmHeight; l;F"m+B!$
bih.biPlanes=1; b[%@3 }E
bih.biSize=sizeof(BITMAPINFOHEADER); YV>a 3
bih.biSizeImage=size; "tEp8m
bih.biWidth=btm.bmWidth; IPot][ N>
bih.biXPelsPerMeter=0; NP>v@jO
bih.biYPelsPerMeter=0; .EYL
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); SX3'|'-
static int filecount=0; dT`nR"
CString name; $-_" SWG.
name.Format("pict%04d.bmp",filecount++); J%bNt)K}
name=m_Path+name; \%-<O
BITMAPFILEHEADER bfh; BRFsw`c
bfh.bfReserved1=bfh.bfReserved2=0; DJ ru|2
bfh.bfType=((WORD)('M'<< 8)|'B'); B<W}:>3
bfh.bfSize=54+size; +'H[4g`
bfh.bfOffBits=54; X[z;P!U
CFile bf; pj'gTQ),0
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <O
jK $KV
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2OG/0cP
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Q0*E&;|
bf.WriteHuge(lpData,size); iGW(2.Z
bf.Close(); g
pciv
nCount++; g$(Y\`zw
} y"?`MzcJ0
GlobalFreePtr(lpData); zD_5TGM=
if(nCount==1) 3}L3n*Ft#.
m_Number.Format("%d picture captured.",nCount); j/V_h'}
else 32GI+NN
m_Number.Format("%d pictures captured.",nCount); s>9I#_4]
UpdateData(FALSE); Vjs2Yenx
} %<i sdvF
b:1B
>
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5nPvEN/
{ kH g|!
if(pMsg -> message == WM_KEYDOWN) H4Bt.5O*
{ &-/J~b)"
if(pMsg -> wParam == VK_ESCAPE) QPy h.9:N
return TRUE; DpHubqWz
if(pMsg -> wParam == VK_RETURN) LP3#f{U
return TRUE; eDd&vf
} Z<U,]iZB
return CDialog::PreTranslateMessage(pMsg); 8~ y!X0Ov!
} 6Ga'_P:
lw=kTYbq
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zU5@~J
{ .+7n@Sc
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a$W
O}g?
SaveBmp(); fb
f&bJT
return FALSE; pbzt8 P[
} AB=%yM7V*
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !&%KJS6p4
CMenu pop; .]9`eGVWj
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?MDo. z3
CMenu*pMenu=pop.GetSubMenu(0); Ehy(;n)\
pMenu->SetDefaultItem(ID_EXITICON); a-*sm~u
CPoint pt; qMaO1cE\
GetCursorPos(&pt); $`xpn#lz
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CW`^fI9H
if(id==ID_EXITICON) mbAzn
DeleteIcon(); IO7z}![V;
else if(id==ID_EXIT)
Z%#e* O0
OnCancel(); c[J 2;"SP
return FALSE; tFcQ.1
} <B%wq>4S
LRESULT res= CDialog::WindowProc(message, wParam, lParam); sta/i?n
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~U+<JC Z
AddIcon(); kr$)nf
return res; |A4B4/!
} hGFi|9/-u
Gn7\4,C
void CCaptureDlg::AddIcon() JP!e'oWxi
{ *Y1s4FXu2
NOTIFYICONDATA data; u%L6@M2
data.cbSize=sizeof(NOTIFYICONDATA); padV|hF3(e
CString tip; `+=Zq :0
tip.LoadString(IDS_ICONTIP); ^uX"04>;
data.hIcon=GetIcon(0); H28-;>'`
data.hWnd=GetSafeHwnd(); M5[#YG'FlQ
strcpy(data.szTip,tip); '+_-r'2
data.uCallbackMessage=IDM_SHELL; '>[ZfT
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n4?;!p<F
data.uID=98; .KYs5Qu
Shell_NotifyIcon(NIM_ADD,&data); `B?+1Gv
ShowWindow(SW_HIDE); OL=X&Vaf<
bTray=TRUE; oe6Ex5h
} ZS l K
y2k's
void CCaptureDlg::DeleteIcon() Y&VypZ"G>
{ 9[t-W:3c7
NOTIFYICONDATA data; 4o''C |ND
data.cbSize=sizeof(NOTIFYICONDATA); 2!f'l'}
data.hWnd=GetSafeHwnd(); _2k<MiqCD[
data.uID=98; .K940& Ui
Shell_NotifyIcon(NIM_DELETE,&data); <)cmI .J3
ShowWindow(SW_SHOW); ")boY/ P/w
SetForegroundWindow(); 7|Qb}[s
ShowWindow(SW_SHOWNORMAL); qq^[(n
bTray=FALSE; i(u zb<
} rI)&.5^
_ru<1n[4~
void CCaptureDlg::OnChange() VQ~eg wJL
{ nP=/XiCj
RegisterHotkey(); HDo=W qG
} U:/_T>f%
NFU=PS$
BOOL CCaptureDlg::RegisterHotkey() |bRi bB
{ Rlr[uU_
UpdateData(); Y5>'(A>
UCHAR mask=0; p8y<:8I
UCHAR key=0; yC}x6xG
if(m_bControl) B*Q.EKD8s
mask|=4; .bMU$ O1
if(m_bAlt) Tq6@
1j6p
mask|=2; wZ8LY;
if(m_bShift) KbRKPA`
mask|=1; [s!c c:JR
key=Key_Table[m_Key.GetCurSel()]; I>3G"[t
if(bRegistered){ Z=?qf$.}
DeleteHotkey(GetSafeHwnd(),cKey,cMask); (i'wa6[E8
bRegistered=FALSE; *u<@_Oa
} 7"_gX
cMask=mask; k.0pPl
cKey=key; 2wh{[Q2f
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !91<K{#A{
return bRegistered; PDh1*bf{u
} T|nN.
Z$@ XMq!
四、小结 A7:W0Gg
"2/VDB4!FG
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。