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:
Ur9L8EdC
,,c+R?D 一、实现方法
?E}9TQ -UoTBvObAm 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:
1/3<u:: _C3O^/<n4V #pragma data_seg("shareddata")
jO0"`|(]s HHOOK hHook =NULL; //钩子句柄
PcQ\o>0") UINT nHookCount =0; //挂接的程序数目
fW
w+'xF! static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
/(u# D[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
k>)Uyw$! static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
5W!#,jz static int KeyCount =0;
&[z<p static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
WYN0,rv1:+ #pragma data_seg()
iLt2L;v>h tMiy`CPh 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
]iYO}JuX o~{rZ~ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
'
~1/*F%8 nv<t$r BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
A2.GNk cKey,UCHAR cMask)
v[<x>?iD_ {
w9w=2 * BOOL bAdded=FALSE;
Sq SiuO.D for(int index=0;index<MAX_KEY;index++){
` 7P%muY. if(hCallWnd[index]==0){
X`20=x hCallWnd[index]=hWnd;
>{)\GK0i7 HotKey[index]=cKey;
nX_w F`n" HotKeyMask[index]=cMask;
8ZF!}kb0F bAdded=TRUE;
}nRTw2-z KeyCount++;
Cq -URih break;
wq7h8Z}l }
VkkC;/BBW }
Jsa]RA return bAdded;
,4j^lgJ }
E?0Vo%Vh //删除热键
f hjlt# BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H+
7HD|GE {
tIT/HG_o BOOL bRemoved=FALSE;
d=0{vsrB for(int index=0;index<MAX_KEY;index++){
8'ut[ if(hCallWnd[index]==hWnd){
jf.WmiDC if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$|tk?Sps hCallWnd[index]=NULL;
rI OKCL? HotKey[index]=0;
2f0mr?l)N HotKeyMask[index]=0;
. {vMn0c bRemoved=TRUE;
A*~BkvPr KeyCount--;
j+PLtE break;
PA*1]i#2M= }
7_R[=t }
?3%r:g4 }
y>X(GF^ return bRemoved;
VHi'~B#'* }
*P/DDRq(2 S.Q:O{] Q?bCQZ{-Lh DLL中的钩子函数如下:
%ol\ sO| [Z2{S-)UM LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
mM r$~^P: {
8,IQ6Or|-2 BOOL bProcessed=FALSE;
]XASim:A if(HC_ACTION==nCode)
'YJ~~o {
CXBFR>" if((lParam&0xc0000000)==0xc0000000){// 有键松开
h[;DRD!Z switch(wParam)
)KY4BBc {
t`Rbn{ case VK_MENU:
`GSl}A MaskBits&=~ALTBIT;
jwg*\HO,s break;
6!HYx case VK_CONTROL:
-,+~W#n MaskBits&=~CTRLBIT;
}5;/!P_A break;
&;bey4_J case VK_SHIFT:
XmP,3KG2{S MaskBits&=~SHIFTBIT;
h1)ny1; break;
- zUBK default: //judge the key and send message
p"6ydXn% break;
IML.6<,(Z }
CkRilS< for(int index=0;index<MAX_KEY;index++){
S5:&_&R8[ if(hCallWnd[index]==NULL)
8>9MeDE continue;
$DaQM'- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:r2d%:h%2 {
RG=i74a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
voFg6zoV_ bProcessed=TRUE;
kxR!hA8wv4 }
v cUGBGX_& }
=
c1>ja }
+,g!xv4Q else if((lParam&0xc000ffff)==1){ //有键按下
4M!wm]n/%5 switch(wParam)
uzI-1@` {
XgyLlp;,O case VK_MENU:
4:Oq(e_( MaskBits|=ALTBIT;
MJ$.ST break;
@}
+k]c25 case VK_CONTROL:
?,]eN&` MaskBits|=CTRLBIT;
CED[\n break;
wA"d?x case VK_SHIFT:
v$xurj:v#i MaskBits|=SHIFTBIT;
=4sx(< break;
/x)i}M) default: //judge the key and send message
@r^s70{} break;
iUFG!,+d }
x:Q$1&3N for(int index=0;index<MAX_KEY;index++){
3ZbqZ"rE if(hCallWnd[index]==NULL)
#]Lodo9rS\ continue;
|&@`~OBa if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r/@ Wn {
i8KoJY" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Xy. /1`X bProcessed=TRUE;
i&p6UU }
!xBJJ/K+| }
Y78DYbU. }
}
,^p{J/ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
t>OEzUd9 for(int index=0;index<MAX_KEY;index++){
vL;>A]oM2 if(hCallWnd[index]==NULL)
VT-%o7%N continue;
Dc*
H:x; if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
b@Dt]6_UL SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
cml~Oepf //lParam的意义可看MSDN中WM_KEYDOWN部分
k'*vG6! }
ri-D#F)} }
?~IdPSY }
h4=mGJpm return CallNextHookEx( hHook, nCode, wParam, lParam );
4cqf= }
S&.xgBR mfF `K2R 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
XH(-anU"!P Y
DW^N]G BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%iME[| u& BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
x3(
->?)D <$pv;]n 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:
cL!A,+S[_ u\MxQIo'u LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
'@
p464 {
:xTm-L if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
(74y2U6 {
V2xvuDHI //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
?S9vYaA$ SaveBmp();
a@Zolz_Z return FALSE;
e2BC2K0 }
f`*VNB` …… //其它处理及默认处理
WgG$ r }
miTff[hsMa I;1)a4Xc4R 2ga8 G4dU 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。
Sk C.A? b#"&]s- 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>p0{:zM v,8Q9<=O 二、编程步骤
AC 2kG I}f7|hYX 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";
f& \Bs8la lFduX D 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
m`n~-_ r&Qa;-4Pl 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;
#d<|_ |H]0pbC)w 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;
1G67#L)USq #0Uz1[ 5、 添加代码,编译运行程序。
o2hk!#5[4 Ycx}FYTY 三、程序代码
xtIF)M #_`qbIOAj ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
eMdf[eS #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
`iN\@)E #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Jf0i$ #if _MSC_VER > 1000
|:Maa6(W #pragma once
0*9xau{( #endif // _MSC_VER > 1000
ho B[L}<c #ifndef __AFXWIN_H__
nz'6^D7`r #error include 'stdafx.h' before including this file for PCH
KF5r?|8M #endif
@|sBnerE #include "resource.h" // main symbols
,!LY:pMK class CHookApp : public CWinApp
Mu-kvgO`L {
Fq!_VF^r public:
C(h Td% CHookApp();
!*HJBZ]q // Overrides
[)dIt@Y&j // ClassWizard generated virtual function overrides
?E(X>tH //{{AFX_VIRTUAL(CHookApp)
F |R7hqf public:
<2]D3,.g. virtual BOOL InitInstance();
_ WPt
zL virtual int ExitInstance();
$uJc/ //}}AFX_VIRTUAL
$duT'G, - //{{AFX_MSG(CHookApp)
=yM%#{t&W // NOTE - the ClassWizard will add and remove member functions here.
g oyQ',+ // DO NOT EDIT what you see in these blocks of generated code !
S("dU`T? //}}AFX_MSG
~IWdFUKk DECLARE_MESSAGE_MAP()
[}GK rI };
B"\9sl X LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
"wg$ H1K BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
AL^tUcl BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
W}2!~ep! BOOL InitHotkey();
6O.kKhk BOOL UnInit();
[~RO9=;L #endif
_uL[
Z 5~T+d1md //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
>Yk|(!v #include "stdafx.h"
NI.ROk1{+4 #include "hook.h"
JZ*.;}" #include <windowsx.h>
;UUgqX# #ifdef _DEBUG
$$W2{vr7+ #define new DEBUG_NEW
r>i95u82' #undef THIS_FILE
4zt:3bWU static char THIS_FILE[] = __FILE__;
9Li&0E #endif
12hD*,A5j #define MAX_KEY 100
XGbpH< #define CTRLBIT 0x04
'Ha> >2M #define ALTBIT 0x02
vdQ#CG$/ #define SHIFTBIT 0x01
INp:; #pragma data_seg("shareddata")
7:Rt) EE2 HHOOK hHook =NULL;
U<q`f- UINT nHookCount =0;
&Td)2Wt static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
MEJX5qG6m static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
*)`PY4zF static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
q#Q %p+ static int KeyCount =0;
5GgH6 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]4V1] #pragma data_seg()
,bIJW]h0 HINSTANCE hins;
3A[<LnKR^E void VerifyWindow();
N{&Lo}6F BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
x4g/ok //{{AFX_MSG_MAP(CHookApp)
Ovj^
7r:<s // NOTE - the ClassWizard will add and remove mapping macros here.
Eu"8IM!%- // DO NOT EDIT what you see in these blocks of generated code!
+]( y //}}AFX_MSG_MAP
E{e END_MESSAGE_MAP()
mvc ;.+ \>}#[?y CHookApp::CHookApp()
zS|4@t\__ {
Njr;Wa.r+ // TODO: add construction code here,
<?}pCX/O // Place all significant initialization in InitInstance
+:=FcsY }
<6Y;VH^_ &Xh> w(u CHookApp theApp;
2
'D,1F LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|r,})o> {
x{zZ%_F BOOL bProcessed=FALSE;
YcclO if(HC_ACTION==nCode)
vM!2?8bEFd {
XzX2V">(% if((lParam&0xc0000000)==0xc0000000){// Key up
iWC}\&i switch(wParam)
X am8h {
|e+3d3T35 case VK_MENU:
s3nt2$=:t MaskBits&=~ALTBIT;
0vX6n6G} break;
c}|.U case VK_CONTROL:
z~tdLtcX MaskBits&=~CTRLBIT;
"aI)LlyCY break;
i>[xN[U( case VK_SHIFT:
:A!EjIL`# MaskBits&=~SHIFTBIT;
VS ;y break;
+!px+*)bW default: //judge the key and send message
o<Mccj break;
K@xMPB8in }
K5T1dBl,0 for(int index=0;index<MAX_KEY;index++){
X=Ar"Dx}}s if(hCallWnd[index]==NULL)
UBM#~~sM continue;
u0sN[< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$gz8!
f? {
F?]J`F\I SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Ta/zDc"e bProcessed=TRUE;
2|i1} }
UF6U5],`u }
~*y7%L4B }
:p@jslD else if((lParam&0xc000ffff)==1){ //Key down
#>\SK switch(wParam)
eq8faC5 {
e!L5v? case VK_MENU:
SqRM*Cf= MaskBits|=ALTBIT;
8v8-5N break;
mwsBj) case VK_CONTROL:
"=C~IW MaskBits|=CTRLBIT;
.m8l\h^3 break;
KnA BFH case VK_SHIFT:
ub9[!}r't MaskBits|=SHIFTBIT;
"DGap*=J
break;
4|I;z default: //judge the key and send message
Ja4M@z break;
%saP>]o }
}qoId3iY!7 for(int index=0;index<MAX_KEY;index++)
lxgfi@@+h {
~MC5rOA if(hCallWnd[index]==NULL)
`8O Bw continue;
[A{o"zY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
s5+;8u9K {
oQV3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
KU{zzn;g bProcessed=TRUE;
sb3z8:r }
KehM.c^ }
zDtC]y' }
SFtcO if(!bProcessed){
(G} }h for(int index=0;index<MAX_KEY;index++){
gg^iYTpt if(hCallWnd[index]==NULL)
N}NKQ]= continue;
a?GXVQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
tWzB Qx SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$uFvZ?w& }
oq,nfUA }
ni2 [K` }
I0Allw[ return CallNextHookEx( hHook, nCode, wParam, lParam );
fJ5mKN }
.57Fh)Y ^'tT_
gT BOOL InitHotkey()
>@cBDS<6R {
`uk=2k}&m if(hHook!=NULL){
YU+P+m2X nHookCount++;
N#RC; return TRUE;
1,$"'lKwt }
$8 &Y(` else
)6X-m9.X hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-zJV(` if(hHook!=NULL)
{{_v.d~1 nHookCount++;
[*(1~PrlO, return (hHook!=NULL);
1BW 9,Xr }
edcz%IOM( BOOL UnInit()
D*VO;?D {
Nl,iz_2] if(nHookCount>1){
+$VDV4l nHookCount--;
u{\>iQ
return TRUE;
P2`F"
Qsq }
+]-'{%-zK BOOL unhooked = UnhookWindowsHookEx(hHook);
ik)u/r DW if(unhooked==TRUE){
[N~-9 nHookCount=0;
m{Uh{G$ hHook=NULL;
:BV $3]y }
qa@;S,lp return unhooked;
SDS P4W5 }
UY({[?Se LY)Wwl*wc BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ci4c8 {
J@<f* BOOL bAdded=FALSE;
toPFkc6` for(int index=0;index<MAX_KEY;index++){
LE5N2k if(hCallWnd[index]==0){
{`
bX*] hCallWnd[index]=hWnd;
>7cj.% HotKey[index]=cKey;
`W_&^>yl HotKeyMask[index]=cMask;
9ei'oZ bAdded=TRUE;
!ii(2U KeyCount++;
\}k R'l break;
gpzFY"MS= }
.mqMzV }
jr.{M return bAdded;
d_&pxy?
> }
o+{i26% '~f*O0_ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zd-
*UFi {
qBK68B) BOOL bRemoved=FALSE;
2G5|J{4w for(int index=0;index<MAX_KEY;index++){
Evg#sPu\ if(hCallWnd[index]==hWnd){
KVEc:<|x if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_99 +Vjy hCallWnd[index]=NULL;
h:C:opa-= HotKey[index]=0;
|x&4vHXR0 HotKeyMask[index]=0;
MNTVG&h bRemoved=TRUE;
_7;G$\^&. KeyCount--;
LX&O"YY break;
yil5aUA }
l*w' O }
/u90)x }
(vi^ t{k return bRemoved;
y,1U]1TP }
lFIaC} =HIKn6C< void VerifyWindow()
K%/\XnCY {
-Q
Mwtr#q} for(int i=0;i<MAX_KEY;i++){
G)b:UJa" if(hCallWnd
!=NULL){ +8 \?7,FY
if(!IsWindow(hCallWnd)){ EW4a@
hCallWnd=NULL; 5?Q5cD2]\6
HotKey=0; UA6
C/
HotKeyMask=0; 9fTl6?x
KeyCount--; be_h
uZ
} mRyf+O[
} +jq@!P"}d
} =^*EM<WG)
} ?y>v"1+
vmOye/?k
BOOL CHookApp::InitInstance() 0;=]MEk?
{ vlDA/( &
AFX_MANAGE_STATE(AfxGetStaticModuleState()); E#tfCM6
hins=AfxGetInstanceHandle(); vZS/?pU~~
InitHotkey(); ;"EDFH#W
return CWinApp::InitInstance(); SJLs3iz_)
} "W4|}plnu
>,k2|m
int CHookApp::ExitInstance() u6Ux nqNc
{ #wvGS%
VerifyWindow(); 7J$rA.tu
UnInit(); ;Z"Iv
return CWinApp::ExitInstance(); iGj,B =35
} rAW7Zp~KK
;H71A[M
T
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g}hNsU=$5~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +gBDE:
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u|"YS-dH
#if _MSC_VER > 1000 17;9> *O'
#pragma once Rw[!Jq
#endif // _MSC_VER > 1000 8(q8}s$>
48J{Y3F
class CCaptureDlg : public CDialog Zg4wd/y?
{ 4z~;4
// Construction "la0@/n
public: :*|So5fs
BOOL bTray; 6fBA#Kb
BOOL bRegistered; g%m-*v*
BOOL RegisterHotkey(); XPt>klf
UCHAR cKey; (o{x*';i4
UCHAR cMask;
k6@
void DeleteIcon(); C deV3
void AddIcon(); efHCPj
UINT nCount; lq`7$7-4
void SaveBmp(); @V Tw>=94
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Vz!{nL0Q(
// Dialog Data "~6&rt
//{{AFX_DATA(CCaptureDlg) gr.G']9lNq
enum { IDD = IDD_CAPTURE_DIALOG }; sMJa4P>O@
CComboBox m_Key; #%OS=.V
BOOL m_bControl; v!<FeLW
BOOL m_bAlt; -{d(~XIo
BOOL m_bShift; f1o^:}5x
CString m_Path; SjJ$Oinc
CString m_Number; *(i%\
//}}AFX_DATA r<P? F
// ClassWizard generated virtual function overrides &js$qgY
//{{AFX_VIRTUAL(CCaptureDlg) |6Iw\YU
public: G2c\"[N1/
virtual BOOL PreTranslateMessage(MSG* pMsg); ]:?hU^H]<
protected: ?=kH}'igq
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7Ot&]M
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?G&J_L=@Y
//}}AFX_VIRTUAL Dp^=% F{t
// Implementation ~:_10g]r
protected: TDg<&ND3
HICON m_hIcon; XC/M:2$
// Generated message map functions 6B>*v`T:
//{{AFX_MSG(CCaptureDlg) <FZ*'F*M
virtual BOOL OnInitDialog(); 0BjP|API
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); duCXCX^n
T
afx_msg void OnPaint(); }J\7IsM&
afx_msg HCURSOR OnQueryDragIcon(); C^U>{jf !
virtual void OnCancel(); q="ymx~
afx_msg void OnAbout(); += gU`<\
afx_msg void OnBrowse(); we*E}U4
afx_msg void OnChange(); >w\3.6A
//}}AFX_MSG }ri7@HCY4
DECLARE_MESSAGE_MAP() @_WZZ
}; md : Wx
#endif 0PUSCka'6
C'sA0O@O
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $Nj'_G\}
#include "stdafx.h" />PH{ l
#include "Capture.h" 8N#.@\'kz.
#include "CaptureDlg.h" >7W8_6sC<
#include <windowsx.h> Gh%dVP9B@P
#pragma comment(lib,"hook.lib") 8<EU|/O
#ifdef _DEBUG f=4q]y#& X
#define new DEBUG_NEW 6"+bCx0:
#undef THIS_FILE Zjc0R
static char THIS_FILE[] = __FILE__; !|"LAr9u
#endif "QtkNy%E
#define IDM_SHELL WM_USER+1 `<R^ZL,
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -b
)~
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }Q,BI*}*
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6gq`V,
class CAboutDlg : public CDialog nK]L0 *s
{ f~p[izt
public: bD1IY1
CAboutDlg(); @_;vE(!5
// Dialog Data JVPLE*T
//{{AFX_DATA(CAboutDlg) OF!n}.O(
enum { IDD = IDD_ABOUTBOX }; :%zA X
//}}AFX_DATA kH62#[J)yM
// ClassWizard generated virtual function overrides 2>Kn'p
//{{AFX_VIRTUAL(CAboutDlg) q\fai^_
protected: #CB`7}jq
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;,B $lgF
//}}AFX_VIRTUAL 0qN?4h)7
// Implementation a)/ }T
protected: >-CNHb
//{{AFX_MSG(CAboutDlg) +/#Lm#*nu%
//}}AFX_MSG $1D>}5Ex
DECLARE_MESSAGE_MAP() FJsg3D*@J
}; %w/:mH3FA
K!!#";Eo
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;@[ax{ J
{ M8FC-zFs
//{{AFX_DATA_INIT(CAboutDlg) RUV:
//}}AFX_DATA_INIT F
@Wb<+0
} il:RE8
vH?3UW
void CAboutDlg::DoDataExchange(CDataExchange* pDX) YJ 01-
{ >#xIqxV,
CDialog::DoDataExchange(pDX); zids2/_*
//{{AFX_DATA_MAP(CAboutDlg) <r8s=<:
//}}AFX_DATA_MAP U+ief?;4F
} {'f=*vMI
MrS~u
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) l;;"v) C8
//{{AFX_MSG_MAP(CAboutDlg) r@H7J 5<Y-
// No message handlers cbX<
//}}AFX_MSG_MAP {gS7pY%_W
END_MESSAGE_MAP() ?
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G5zsId
dS
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FS6ZPjG)
: CDialog(CCaptureDlg::IDD, pParent) m' L8z
fX
{ XSo$;q\
//{{AFX_DATA_INIT(CCaptureDlg) |%Ssb;M
m_bControl = FALSE; Ky[-ZQQo=5
m_bAlt = FALSE; <cR]-Yr~
m_bShift = FALSE; ,N2|P:x
m_Path = _T("c:\\"); >iWw
i'T=
m_Number = _T("0 picture captured."); u-X P`
nCount=0; _R|8_#yM
bRegistered=FALSE; _/a8X:[(
bTray=FALSE; Ap%tm)@1
//}}AFX_DATA_INIT @-jI<g
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 E&2mFg
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); FZJ sZeO
} "]1|%j
2c8e:Xgv
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P&8QKX3
j^
{ #,\qjY
CDialog::DoDataExchange(pDX); c_.4~>qw
//{{AFX_DATA_MAP(CCaptureDlg) w 8oIq*
DDX_Control(pDX, IDC_KEY, m_Key); L
t.Vo
DDX_Check(pDX, IDC_CONTROL, m_bControl); /AUXO]
DDX_Check(pDX, IDC_ALT, m_bAlt); Xx=c'j<
DDX_Check(pDX, IDC_SHIFT, m_bShift); :|E-Dx4F6H
DDX_Text(pDX, IDC_PATH, m_Path); P}$DCD<$U
DDX_Text(pDX, IDC_NUMBER, m_Number); aQ.mvuMa7'
//}}AFX_DATA_MAP Qj/.x#T
} ^CQVqa${]
mM;p 7
sJ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) B)(ZRH
//{{AFX_MSG_MAP(CCaptureDlg) m<e-XT
ON_WM_SYSCOMMAND() ^-pHhh|g
ON_WM_PAINT() ){ ,v&[
ON_WM_QUERYDRAGICON() =jW=Z$3q
ON_BN_CLICKED(ID_ABOUT, OnAbout) Bis'59?U_
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $+Vp>
ON_BN_CLICKED(ID_CHANGE, OnChange) pe7R1{2Q_s
//}}AFX_MSG_MAP DM)%=C6<
END_MESSAGE_MAP() RS1c+]rr
s*.&DN
BOOL CCaptureDlg::OnInitDialog() $tFmp)
{ I?IAZa)
CDialog::OnInitDialog(); !$^LTBOH3
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :=^_N}
ASSERT(IDM_ABOUTBOX < 0xF000); VT`C<'
CMenu* pSysMenu = GetSystemMenu(FALSE); 9~C$C
if (pSysMenu != NULL) {qjw
S1v
{ 94xRKQ}
CString strAboutMenu; b'5L|1d
strAboutMenu.LoadString(IDS_ABOUTBOX); q8e34Ly7
if (!strAboutMenu.IsEmpty()) /?g:`NT
{ T@, tlIM
pSysMenu->AppendMenu(MF_SEPARATOR); IA?v[xu
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b#z{["%Zp
} p:8&&v~I
} sas:5iB5
SetIcon(m_hIcon, TRUE); // Set big icon x9B{|+tIoc
SetIcon(m_hIcon, FALSE); // Set small icon dw
e$, 9
m_Key.SetCurSel(0); h oL"K
RegisterHotkey(); CYWL@<p,
CMenu* pMenu=GetSystemMenu(FALSE);
2<' 1m{
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); BD (
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3Zeh$DZ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); bQu1L>c,Uw
return TRUE; // return TRUE unless you set the focus to a control 2n8spLZYGY
} Iw-3Z'hOX
%N
}0,a0
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) pSlosv(6
{ bB`p-1
if ((nID & 0xFFF0) == IDM_ABOUTBOX) MZInS:Vj
{ @u}1 S1
CAboutDlg dlgAbout; b63 tjqk
dlgAbout.DoModal(); Rr/sxR|0_
} Fj~,>
else W.t`
{ @z1Yj"^Pm
CDialog::OnSysCommand(nID, lParam); gu~F(Fb'
} v*k}{M
} h1'j1uI
(lBwkQNQGd
void CCaptureDlg::OnPaint() ^saH^kg1"
{ <;
(pol|
if (IsIconic()) AqHH^adzA:
{ 0qUBt9rA
CPaintDC dc(this); // device context for painting 2En^su$
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [ym
ynr3M
// Center icon in client rectangle b _#r_`
int cxIcon = GetSystemMetrics(SM_CXICON); !xz0zT.
int cyIcon = GetSystemMetrics(SM_CYICON); ]NrA2i?
CRect rect; u= u#6%
GetClientRect(&rect); ^dF?MQA<@
int x = (rect.Width() - cxIcon + 1) / 2; eURj'8o),
int y = (rect.Height() - cyIcon + 1) / 2; :_y}8am;H~
// Draw the icon bW9a_m yE
dc.DrawIcon(x, y, m_hIcon); ySk'#\d
} xmI!N0eta
else O0VbKW0h3
{ 3"ii_#1
CDialog::OnPaint(); ya^zlj\`0e
} i`}nv,
} R8U?s/*
g*nh8
HCURSOR CCaptureDlg::OnQueryDragIcon() "}(g3Iy
{ k;bdzcMkQ
return (HCURSOR) m_hIcon; 8qY\T0
} -U"h3Ye^
3h-C&C
void CCaptureDlg::OnCancel() '*6S0zt
{ <$]=Vaq
if(bTray) #M5R>&?Jqz
DeleteIcon(); ^t{2k[@
CDialog::OnCancel(); .0b$mSV[
} KDODUohC
d?uN6JH9
void CCaptureDlg::OnAbout() ogrh"
{ PfRe)JuB
CAboutDlg dlg; l&f"qF?
dlg.DoModal(); 1>BY:xZr
} ^mA ^7jB
np#RBy
void CCaptureDlg::OnBrowse() &2EimP
{ k15B5
CString str; iVg3=R)[1
BROWSEINFO bi; p*_^JU(<p
char name[MAX_PATH]; ksB-fOv*N
ZeroMemory(&bi,sizeof(BROWSEINFO)); a2MFZe
bi.hwndOwner=GetSafeHwnd(); im6Rx=}E{
bi.pszDisplayName=name; @FBlF$vG
bi.lpszTitle="Select folder"; 0+]ol:i
bi.ulFlags=BIF_RETURNONLYFSDIRS; K~ 6[zJ4
LPITEMIDLIST idl=SHBrowseForFolder(&bi); <lBY
if(idl==NULL) -t:~d:
return; GV1SKa
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eiJ13`T
str.ReleaseBuffer(); )S;pYVVAl
m_Path=str; l".LtUf-
if(str.GetAt(str.GetLength()-1)!='\\') 2!u4nxZ.
m_Path+="\\"; wInJ!1
UpdateData(FALSE); ,a&&y0,
} /kLG/ry8l:
PSM~10l,
void CCaptureDlg::SaveBmp() CSC
sJE#4
{ *}hx9:9\B
CDC dc; srbU}u3VZ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); E
mUA38
CBitmap bm; =68CR[H
int Width=GetSystemMetrics(SM_CXSCREEN); z,"fr%*,N
int Height=GetSystemMetrics(SM_CYSCREEN); f;[\'_.*
bm.CreateCompatibleBitmap(&dc,Width,Height); ;ORT#7CU
CDC tdc; q
(?%$u.
tdc.CreateCompatibleDC(&dc); 0KQDw
CBitmap*pOld=tdc.SelectObject(&bm); 8hK\Ya:mP
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e95x,|.-_
tdc.SelectObject(pOld); ># {,(8\
BITMAP btm; &ZmHR^Flz
bm.GetBitmap(&btm); 91
] "D;NN
DWORD size=btm.bmWidthBytes*btm.bmHeight; V@QWJZ"
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xTy[X"sJ
BITMAPINFOHEADER bih; yMQZulCWE
bih.biBitCount=btm.bmBitsPixel; @w H+,]xE
bih.biClrImportant=0; X~`<ik{q
bih.biClrUsed=0; /Lf+*u>"
bih.biCompression=0; Z uh!{_x;
bih.biHeight=btm.bmHeight; / p_mFA]@
bih.biPlanes=1; u0)~Im,X
bih.biSize=sizeof(BITMAPINFOHEADER); zO)>(E?
bih.biSizeImage=size; YL$#6d
bih.biWidth=btm.bmWidth; /qYo*S_cG
bih.biXPelsPerMeter=0; ubpVrvu@
bih.biYPelsPerMeter=0; <K$X>&Ts
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?x*Ve2+]
static int filecount=0; 7~2/NU?
CString name; Zr&~gXmVS
name.Format("pict%04d.bmp",filecount++); jP]I>Tq
name=m_Path+name; 3kl<~O|Fs
BITMAPFILEHEADER bfh; f^tCD'Vmi
bfh.bfReserved1=bfh.bfReserved2=0; IwE{Zvr
bfh.bfType=((WORD)('M'<< 8)|'B'); ]7*Z'E
bfh.bfSize=54+size; xS4B"/
bfh.bfOffBits=54; A 11w{`EM
CFile bf; &s +DK`
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <rO0t9OH
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qB`-[A9HPe
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); KNkVI K
bf.WriteHuge(lpData,size); `YZK$
-,
bf.Close(); tKnvNOhn
nCount++; ,}("es\b
} x"n!nT%Z
GlobalFreePtr(lpData); aetK<9L$
if(nCount==1) dW32O2@-
m_Number.Format("%d picture captured.",nCount); /GzA89N(
else 63J_u-o
m_Number.Format("%d pictures captured.",nCount); XzX-Q'i=n0
UpdateData(FALSE); O[N}@%HMW
} *bl*R';
$*%ipD}f
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @Gh?|d7bD
{ "|2|Vju%
if(pMsg -> message == WM_KEYDOWN) f`8]4ms"
{ R::0.*FF
if(pMsg -> wParam == VK_ESCAPE) /``4!jU
return TRUE; [>B`"nyNQ
if(pMsg -> wParam == VK_RETURN) DE{tpN
return TRUE; Kc6p||<
} 2WP73:'t
return CDialog::PreTranslateMessage(pMsg); i.|zKjF'
} '^TQ Ubw
peA}/Jc
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {Z529Ns
{ :GXD-6}^|
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KRY%B[k
SaveBmp(); SMMV$;O{9
return FALSE; DNP%]{J
}
h:[8$]
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [7K-L6X
CMenu pop; -P+@n)?T6
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ca SoR |
CMenu*pMenu=pop.GetSubMenu(0); Ya#,\;dTT
pMenu->SetDefaultItem(ID_EXITICON); b'D|p/)m0S
CPoint pt; &a'H vQV
GetCursorPos(&pt); 9q?\F
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sHk,#EsKH
if(id==ID_EXITICON) q8 j
W&_
DeleteIcon(); *PXlbb
else if(id==ID_EXIT) )FNvtLZ
OnCancel(); '7+e!>"
return FALSE; y>:-6)pv
} j89C~xP6
LRESULT res= CDialog::WindowProc(message, wParam, lParam); i\2d1Z
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J 8/]&Ow
AddIcon(); #cN0ciCT'
return res; 7e{w)m:A
} 5hVp2w-
,a:!"Z^f
void CCaptureDlg::AddIcon() \S[7-:Lu^
{ E>/kNl
NOTIFYICONDATA data; .L,xqd[zC
data.cbSize=sizeof(NOTIFYICONDATA); 0i76(2
CString tip; 7J
0=HbH
tip.LoadString(IDS_ICONTIP); @Axwj
data.hIcon=GetIcon(0); I:6N?lD4}0
data.hWnd=GetSafeHwnd(); IoEITKd
strcpy(data.szTip,tip); So?ScX\lG
data.uCallbackMessage=IDM_SHELL; FME&vUh/
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .
6wyu7oK
data.uID=98; eXHk6[%[
Shell_NotifyIcon(NIM_ADD,&data); +=XDNSw
ShowWindow(SW_HIDE); (J c} K
bTray=TRUE; xQ4'$rL1d
} ^)r^k8y'
On[:]#
void CCaptureDlg::DeleteIcon() ~Rs_ep'+Q2
{ rf2+~B{$,
NOTIFYICONDATA data; YbMeSU/sX
data.cbSize=sizeof(NOTIFYICONDATA); _\HMF
data.hWnd=GetSafeHwnd(); 8\z5* IPGs
data.uID=98; K$S:V=y%r7
Shell_NotifyIcon(NIM_DELETE,&data); 8Ol#-2>k$
ShowWindow(SW_SHOW); 5t`:=@u
SetForegroundWindow(); Pj4WWK X
ShowWindow(SW_SHOWNORMAL); -&PiD
bTray=FALSE; *z2G(Uac
} bCM&Fe0GM
o"O=Epg
void CCaptureDlg::OnChange() bITc9Hqc
{ N5 BC<pu
RegisterHotkey(); K~j&Q{yws@
} ZRDY`eK
0KW@j>=jK
BOOL CCaptureDlg::RegisterHotkey() zJp}JO
{ R)>/P{A-P
UpdateData(); o80"ZU|=
UCHAR mask=0; GpjyF_L
UCHAR key=0; %/l9$>{
if(m_bControl) 8>Y
mask|=4; -ZTe#@J
if(m_bAlt) 8.-0_C*U;
mask|=2; w\
hl2JTy
if(m_bShift) pYtG%<
mask|=1; }b9"&io
key=Key_Table[m_Key.GetCurSel()]; c7$L:
if(bRegistered){ )7U^&I,
DeleteHotkey(GetSafeHwnd(),cKey,cMask); sSisO?F!Z
bRegistered=FALSE; e:SBX/\j
} q[6tvPfkX
cMask=mask; H%,jB<-.A
cKey=key; w2-:!,X
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <ptgFR+
return bRegistered; m/,.3v
} @ ;%+Ms
Eei"baw/
四、小结 s}MD;V&0
1Sk=;Bic
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。