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:
19.!$; [pyXX>:M 一、实现方法
Ij,?G* ,_7tRkn 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:
r+WPQ`Ar [zO(V`S2 #pragma data_seg("shareddata")
<\#
HHOOK hHook =NULL; //钩子句柄
-_H2FlB UINT nHookCount =0; //挂接的程序数目
?R~Ye static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
1\9BO:<K static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
{:q9: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
#'{PYr static int KeyCount =0;
" kJWWR static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
`5aypJf1 #pragma data_seg()
P#'DG W&W0 \6PIw-) 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。
g\mrRZ/? E`LIENm 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=cfk# & ;x1Rx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
&|,qsDK( cKey,UCHAR cMask)
OEq e^``! {
4~J1pcBno% BOOL bAdded=FALSE;
4pHPf<6 for(int index=0;index<MAX_KEY;index++){
k?*DBXJv if(hCallWnd[index]==0){
=u1w\>( 2Y hCallWnd[index]=hWnd;
ri_6wbPp HotKey[index]=cKey;
`oI/;& HotKeyMask[index]=cMask;
~+NFWNgN bAdded=TRUE;
\|4MU"ri KeyCount++;
J}` $WL: break;
Q $,kB<M }
OCoRcrAx }
0}3'h#33= return bAdded;
hdWp }
g 0_r //删除热键
\<+47+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pHbguoH, {
3lEU$)QA3 BOOL bRemoved=FALSE;
Gt*<? for(int index=0;index<MAX_KEY;index++){
,'0oj$~S: if(hCallWnd[index]==hWnd){
F1]PYx$X if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
${H&Q* hCallWnd[index]=NULL;
(~yJce HotKey[index]=0;
J##X5'a3* HotKeyMask[index]=0;
'S-"*:$,u bRemoved=TRUE;
}qX&*DU_@ KeyCount--;
74N\G1 break;
Bwvc@(3v }
[Z&s0f1Qb }
| gxB;
GG }
kj"_Y"q= return bRemoved;
vnOF$6n }
rMFf8D(Y 79fyn!Iz< BY2txLLB DLL中的钩子函数如下:
%3B>1h9N .0/Z'.c8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E;e2{@SX2K {
PX{~! j%n BOOL bProcessed=FALSE;
oN}j <6s
if(HC_ACTION==nCode)
Q`fA)6U {
Bc,z] if((lParam&0xc0000000)==0xc0000000){// 有键松开
dD2e"OIX switch(wParam)
dK`O,[} {
w)c#ZJHG case VK_MENU:
K>~cY%3^i MaskBits&=~ALTBIT;
&(1NOyX& break;
G
U/k^Qy case VK_CONTROL:
NjMLq|X MaskBits&=~CTRLBIT;
ATkqzE`; break;
#6Ph"\G/ case VK_SHIFT:
2PW3S{D t MaskBits&=~SHIFTBIT;
.aRxqFi_ break;
1;9E*= default: //judge the key and send message
|?b"my$g$ break;
s+t eYL#Zi }
U.9nHo{ for(int index=0;index<MAX_KEY;index++){
~a|Q[tiV] if(hCallWnd[index]==NULL)
!a&F:Fbm continue;
GM92yi!8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~}l,H:jk@ {
`I:,[3_/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
+0042Yi bProcessed=TRUE;
n8ya$bc }
Q&\ksM }
/]>{"sS( }
I>zn$d*0 else if((lParam&0xc000ffff)==1){ //有键按下
h^X.e[ switch(wParam)
l3$?eGGM {
U?C{.@#w case VK_MENU:
O/"&?)[v MaskBits|=ALTBIT;
7im;b15j`' break;
FA GVpO[ case VK_CONTROL:
U9OF0=g MaskBits|=CTRLBIT;
aM1JG$+7 G break;
cHd39H9 case VK_SHIFT:
wBGxJ\+M MaskBits|=SHIFTBIT;
u _^=]K; break;
N%i<DsK.u6 default: //judge the key and send message
9~af\G break;
{u][q
&n }
bHG>SW\]`? for(int index=0;index<MAX_KEY;index++){
I[Y?f8gJ if(hCallWnd[index]==NULL)
? +!?$h continue;
>b${rgCvQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tq93 2M4 {
M_uij$1- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
#&gy@!a~ bProcessed=TRUE;
t:n|0G( }
OOwJ3I >]> }
q+Q)IVaU81 }
,g.=vQm:? if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Q:=/d$*xd for(int index=0;index<MAX_KEY;index++){
t`{Fnf if(hCallWnd[index]==NULL)
hidweg*7 continue;
t0(hc7` if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
,5WDYk- SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
<:o><f+ //lParam的意义可看MSDN中WM_KEYDOWN部分
wAPdu y[ }
);LwWKa }
MeS$+9jV( }
zvg&o)/[ return CallNextHookEx( hHook, nCode, wParam, lParam );
{S~$\4vC! }
2J <Z4Ap 14zzWzKx 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:
ShxX[k 5eJd$}Lbc BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
6Z=H>w BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
6.=b^6MV 1j(,VW 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:
exvsf| zt6ep= LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
aP gG+tu {
$Q4b~ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
RT9@&5>il {
^)I:82"|? //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
d_hcv|% SaveBmp();
p^!p7B`qe. return FALSE;
fba3aId[ }
*4E,|IJ …… //其它处理及默认处理
vA `.8U 0S }
QkAwG[4 64@s|m* r8$TT\?~ 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。
QJ?!_2Ax st>t~a|T 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。
=uTV\) >Fh@:M7z 二、编程步骤
}+1o D{ x.Y,]wis 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";
Qa+gtGtJ UQ?8dw:E~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
T~E83Jw `}l%Am 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;
ualtIHXK) b iD7(AK 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;
WBIS 4 vphLAm 5、 添加代码,编译运行程序。
4{pa`o3 wr(?L7
$+ 三、程序代码
|Rc#Q<Vh| 0XNb@ogo ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
&2J|v#$F #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
v;7u"9t #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<}%*4mv #if _MSC_VER > 1000
DFMWgBL #pragma once
u a-p^X`w #endif // _MSC_VER > 1000
y C#{nUdw #ifndef __AFXWIN_H__
511q\w M #error include 'stdafx.h' before including this file for PCH
QkbN2mFv% #endif
*yx:nwmo #include "resource.h" // main symbols
;iVyJZI class CHookApp : public CWinApp
Sz&`=x# {
cA kw5}P public:
P<~y$B CHookApp();
ikC;N5Sw // Overrides
fx},.P=:* // ClassWizard generated virtual function overrides
o\N}?Z,Kk //{{AFX_VIRTUAL(CHookApp)
Uan;}X7@ public:
(ydeZx virtual BOOL InitInstance();
iuEdm:pW virtual int ExitInstance();
ns-x\B?^ //}}AFX_VIRTUAL
%k_JLddlW //{{AFX_MSG(CHookApp)
AyDK-8a // NOTE - the ClassWizard will add and remove member functions here.
wpdT " // DO NOT EDIT what you see in these blocks of generated code !
t$J-6dW //}}AFX_MSG
<G={Vfr DECLARE_MESSAGE_MAP()
aryr };
ak zb<aT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
]3G2mY;`"% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
t@\0$V
\X BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
p5\b&~
g BOOL InitHotkey();
l;4F,iI BOOL UnInit();
?(z3/"g] #endif
_kSus }PVB+i M //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
P<1zXs.H #include "stdafx.h"
#R$!| #include "hook.h"
`Cc<K8s8 #include <windowsx.h>
VQyDd~Za #ifdef _DEBUG
uB
BE!w_ #define new DEBUG_NEW
JG `QJ% #undef THIS_FILE
PuWF:'w r static char THIS_FILE[] = __FILE__;
_z;N|Xe #endif
@4pN4v8U #define MAX_KEY 100
.Kx5Kh{ #define CTRLBIT 0x04
0(n/hJ #define ALTBIT 0x02
btOC\bUMfD #define SHIFTBIT 0x01
dFlx6H+R!0 #pragma data_seg("shareddata")
YeQX13C"Z HHOOK hHook =NULL;
d 9|u~3 UINT nHookCount =0;
PF~&!~S>W static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
4D8q Gti static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
d;z`xy(C static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
8m iIlB static int KeyCount =0;
+q1@,LxN static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
J<2N~$ #pragma data_seg()
]du pU"VV HINSTANCE hins;
"-9YvB# void VerifyWindow();
.._wTOSq BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
B*{CcQ<5 //{{AFX_MSG_MAP(CHookApp)
KQk;:1hW // NOTE - the ClassWizard will add and remove mapping macros here.
$ _zdjzT // DO NOT EDIT what you see in these blocks of generated code!
+#O?sI# //}}AFX_MSG_MAP
ppxu\a END_MESSAGE_MAP()
I<$lpU_H B}vI<?c CHookApp::CHookApp()
q8U]Hyp(` {
Gh j[nsoC~ // TODO: add construction code here,
/2c?+04+ // Place all significant initialization in InitInstance
vR -/c }
Gc>\L3u u+*CpKR} CHookApp theApp;
o_cj-
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
5i0<BZDTef {
B!:(*lF BOOL bProcessed=FALSE;
_M?:N:e if(HC_ACTION==nCode)
}Vt5].TA {
B|8(}Ciqx if((lParam&0xc0000000)==0xc0000000){// Key up
!!9V0[ switch(wParam)
R
+k\)_F {
>o@WT kF] case VK_MENU:
h'
16"j> MaskBits&=~ALTBIT;
>y1/*)O9~ break;
wFh{\ case VK_CONTROL:
ZEB1()GB MaskBits&=~CTRLBIT;
IgVxWh# break;
^OUkFH;dG? case VK_SHIFT:
Vry# MaskBits&=~SHIFTBIT;
`=oN &! break;
R{.ku!w default: //judge the key and send message
r8mE break;
[hs{{II }
bygwoZ<E for(int index=0;index<MAX_KEY;index++){
"UE'dWz if(hCallWnd[index]==NULL)
UXd\Q'' continue;
pJ{sBp_$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zU(U^ {
IE3GM^7\ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^CX~>j\( bProcessed=TRUE;
J=()
A+ }
c|E }
k1X <jC]P }
)+{'p0 else if((lParam&0xc000ffff)==1){ //Key down
C; ! )<(Vw switch(wParam)
|XeuqZa {
zdr?1= case VK_MENU:
ifuVV Fov MaskBits|=ALTBIT;
8Y:bvs.j break;
C6GYhG] case VK_CONTROL:
!x>P]j7A}Y MaskBits|=CTRLBIT;
+&|WC2# break;
zF{5!b case VK_SHIFT:
srUpG&Bcx
MaskBits|=SHIFTBIT;
K{N#^L! break;
KnlVZn[3t default: //judge the key and send message
/<GygRs break;
qUCiB} }
" 4s,a for(int index=0;index<MAX_KEY;index++)
oSxHTbp? {
_,5(HETE2 if(hCallWnd[index]==NULL)
p3X> continue;
#\w~(Nm- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Rf7py ) {
DI+kO(S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-BR&b2 bProcessed=TRUE;
*K!V$8k=99 }
Q&yfl }
QGfU: }
'H+pwp"M@ if(!bProcessed){
fY\QI
= for(int index=0;index<MAX_KEY;index++){
_uL m !ku if(hCallWnd[index]==NULL)
Uc\\..Cf continue;
2uz<n}IV if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
yt$V<8a SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
UA}k"uM }
R(3V !ph }
K5b8lc }
%T!UEl`v return CallNextHookEx( hHook, nCode, wParam, lParam );
jh9^5"vQ }
JIDE]f +.{_n(kU BOOL InitHotkey()
Z|E( !"zE9 {
Ip|7JL0Z if(hHook!=NULL){
!qT.D:!@zF nHookCount++;
H+F'K
XP*K return TRUE;
B2VUH..am }
IeE+h-3p else
eo"6 \3z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
0/;T\9 if(hHook!=NULL)
.hnGHX nHookCount++;
DqbN=[!X~n return (hHook!=NULL);
[K,&s8N5 }
6dV92: BOOL UnInit()
Wk`G+VR+ {
e%#9|/uP if(nHookCount>1){
Bm1yBKjO nHookCount--;
J=5G< return TRUE;
5{VrzzOK} }
9_oIAn:< BOOL unhooked = UnhookWindowsHookEx(hHook);
x-Yt@}6mvl if(unhooked==TRUE){
@:X~^K. nHookCount=0;
U_Id6J]8 hHook=NULL;
:43K)O" }
WnU"&XZ return unhooked;
76(&O }
>PfYHO OP{ d(~+ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
IYb@@Jzo {
xqX~nV#TB BOOL bAdded=FALSE;
}>fL{};Z" for(int index=0;index<MAX_KEY;index++){
4,
8gf2 if(hCallWnd[index]==0){
mbU[fHyV hCallWnd[index]=hWnd;
>cQ*qXI0 HotKey[index]=cKey;
qbpvTTF HotKeyMask[index]=cMask;
ZI-)' bAdded=TRUE;
JuKj KeyCount++;
9-I;' break;
P*Uu)mG)G }
|&o%c/ }
mq do@ return bAdded;
Fn yA;,* }
#P<v[O/rA i` n,{{x&4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
esWgYAc3{ {
ySL 31% BOOL bRemoved=FALSE;
7{2knm^ for(int index=0;index<MAX_KEY;index++){
M n3cIGL if(hCallWnd[index]==hWnd){
ts
aD5B if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
4L(axjMYU hCallWnd[index]=NULL;
Cir==7A0 HotKey[index]=0;
_\1wLcFj HotKeyMask[index]=0;
\&n]W\ bRemoved=TRUE;
KzG8K 6wZ KeyCount--;
8!'#B^ break;
s'J8E+&5 }
`b+f^6SJn }
Q9]7.^l }
<G/O!02 return bRemoved;
'cu(
Sd} }
Gmf.lHr$% y/'2WO[ void VerifyWindow()
It!PP1$
{
Z
~:S0HDP for(int i=0;i<MAX_KEY;i++){
Da0E) if(hCallWnd
!=NULL){ ej]^VS7w[r
if(!IsWindow(hCallWnd)){ !Z`~=n3bk
hCallWnd=NULL; :OUNZDL
HotKey=0; Q+[gGe
JUF
HotKeyMask=0; z+C>P4c-y&
KeyCount--; HJ:s)As
} HBXp#$dPc
} _A;jtS)SY
} l%oie1g l
} ]Jq1b210
eh&? BP?
BOOL CHookApp::InitInstance() mTwz&N\
{ !FX;QD@"
AFX_MANAGE_STATE(AfxGetStaticModuleState()); *}$T:kTH
hins=AfxGetInstanceHandle();
![18+Q\
InitHotkey(); 50F6jj
return CWinApp::InitInstance(); pJ ;J>7Gt
} 5rr7lwWZ
1>[3(o3t
int CHookApp::ExitInstance() @{:E&K1f
{ *1$rg?yGf
VerifyWindow(); ~
b!mKyrZ
UnInit(); Ola>] 0l
return CWinApp::ExitInstance(); BOQ2;@:3
} tz4MT_f
hCD0Zel
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hHm&u^xY
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {Nuwz|Ci
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U"v(9m@
#if _MSC_VER > 1000 No=Ig-It
#pragma once [-x~Q[
#endif // _MSC_VER > 1000 @kenv3[Lc
a]>gDDF
class CCaptureDlg : public CDialog 7<<pP
{ ;O}%_ef@
// Construction bjmUU6VLT
public: Ia=wf"JS)
BOOL bTray; Xw(e@:
BOOL bRegistered; Z2_eTC
u
BOOL RegisterHotkey(); ),(ejRP'r
UCHAR cKey; cZuZfMDM
UCHAR cMask; (wdE@/V
void DeleteIcon(); RY8;bUSR
void AddIcon(); q.yS j
UINT nCount; Cg
|_) _w
void SaveBmp(); Oz#$x
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3;zJ\a.+
// Dialog Data
?}e8g
//{{AFX_DATA(CCaptureDlg) Og4 X3QG
enum { IDD = IDD_CAPTURE_DIALOG }; DN2K4%cM%'
CComboBox m_Key; KJo[!|.
BOOL m_bControl; AU)"L_
i}
BOOL m_bAlt; R] tHd=kf
BOOL m_bShift; N)K};yMf
CString m_Path; E ~<SEA
CString m_Number;
oJ ~ZzW
//}}AFX_DATA E3<jH
// ClassWizard generated virtual function overrides Kn SXygT
//{{AFX_VIRTUAL(CCaptureDlg) QXY-?0RO#
public: };o6|e:2E
virtual BOOL PreTranslateMessage(MSG* pMsg); *]nha1!S
protected: OmQSNU.our
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UO47XAO
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); TG8QT\0G
//}}AFX_VIRTUAL UTGR{>=>
// Implementation IHZ WNT2
protected: 7Vr .&`l
HICON m_hIcon; j0B, \A
// Generated message map functions ~
'
81
//{{AFX_MSG(CCaptureDlg) ^W5rL@h_
virtual BOOL OnInitDialog(); .Qg!_C
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); kSv?p1\@&P
afx_msg void OnPaint(); $qYtN`b,
afx_msg HCURSOR OnQueryDragIcon(); z'=*pIY5f
virtual void OnCancel(); iT1"Le/N
afx_msg void OnAbout(); !MSz%QcO
afx_msg void OnBrowse(); =unMgX]$
afx_msg void OnChange(); M7-piRnd4
//}}AFX_MSG .7++wo!,
DECLARE_MESSAGE_MAP() O`~G'l&@T
}; )HNbWGu
#endif BQ{Gp 2N
TS^(<+'
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jz
QmYcd
#include "stdafx.h" m3C&QdjRp
#include "Capture.h" JryDbGc8
#include "CaptureDlg.h" ](a*R
#include <windowsx.h> <?kr"[cQeP
#pragma comment(lib,"hook.lib") fQi7e5
#ifdef _DEBUG $IX>o&S@|
#define new DEBUG_NEW QDYS}{A:V
#undef THIS_FILE .\= GfF'
static char THIS_FILE[] = __FILE__; 9:4PJ%R9
#endif `e .;P
#define IDM_SHELL WM_USER+1 O6LZ<}oUR
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;ob-'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [7q~rcf,Z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ap9CQ h=!
class CAboutDlg : public CDialog B;XFPQ#b
{ x.qn$?3V]
public: ?`V%[~4_I
CAboutDlg(); rpu9
// Dialog Data M >P-0IC
//{{AFX_DATA(CAboutDlg) ;ZPAnd:pb
enum { IDD = IDD_ABOUTBOX }; .%_scNP
//}}AFX_DATA d!7cIYVZ
// ClassWizard generated virtual function overrides KT~J@];Fb
//{{AFX_VIRTUAL(CAboutDlg) %Ez%pT0TQ#
protected: O|m-Uz"+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3.U5Each-
//}}AFX_VIRTUAL zB/$*Hd
// Implementation !;.i#c_u
protected: } R!-*Wk
//{{AFX_MSG(CAboutDlg) o[q
Kf
//}}AFX_MSG #qWa[kB
DECLARE_MESSAGE_MAP() /s.sW l
}; ?1?D[7$
y;<^[
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XmXp0b7
{ ,u^i0uOg
//{{AFX_DATA_INIT(CAboutDlg) zD}dvI}
//}}AFX_DATA_INIT H>AQlO+ J
} CT+pkNC
jJdw\`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7].tt
{ oNY;z-QK
CDialog::DoDataExchange(pDX); \g< M\3f
//{{AFX_DATA_MAP(CAboutDlg) PeEf=3
//}}AFX_DATA_MAP :]iV*zo_
} B;9X{"
s`GwRH<#
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *2N$l>ql:k
//{{AFX_MSG_MAP(CAboutDlg) \gaGTc2&
// No message handlers Ug*:o d
//}}AFX_MSG_MAP Os'
7h
END_MESSAGE_MAP() Rd|};-
GV#"2{t
j
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) EpSVHD:*
: CDialog(CCaptureDlg::IDD, pParent) e#JJd=
{ Ta`=c0
//{{AFX_DATA_INIT(CCaptureDlg) ,2q LiE>
m_bControl = FALSE; )%Z<9k
m_bAlt = FALSE; o7<pI8\
m_bShift = FALSE; rU`#3}s
m_Path = _T("c:\\"); SjV;&
1Z/
m_Number = _T("0 picture captured."); "& 'h\
nCount=0; cdVh_"[
bRegistered=FALSE; Ql&5fyW
bTray=FALSE; M@EML
@~
//}}AFX_DATA_INIT \&ra&3o
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 hE0
p>R8
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &dp<i[ec^
} U1G"T(;s:
jR`q y<
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Tm~a&p
{ L^uO.eI"m
CDialog::DoDataExchange(pDX); $50A!h
//{{AFX_DATA_MAP(CCaptureDlg) vggyQf%
DDX_Control(pDX, IDC_KEY, m_Key); ^55#!/9
DDX_Check(pDX, IDC_CONTROL, m_bControl); +#7e?B
DDX_Check(pDX, IDC_ALT, m_bAlt); W- 5Z"m1I
DDX_Check(pDX, IDC_SHIFT, m_bShift); O`1_eK~1<
DDX_Text(pDX, IDC_PATH, m_Path); d|CSWcU
DDX_Text(pDX, IDC_NUMBER, m_Number); \)'s6>58|
//}}AFX_DATA_MAP ts/rV#s~
} FB-?{78~
V`qHNM/t
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iV;X``S
//{{AFX_MSG_MAP(CCaptureDlg) u^T)4~(
ON_WM_SYSCOMMAND() &QFg=
ON_WM_PAINT() bzD <6Z
ON_WM_QUERYDRAGICON() SVWtKc<
ON_BN_CLICKED(ID_ABOUT, OnAbout) 4%>iIPXi.(
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) d6,SZ*AE
ON_BN_CLICKED(ID_CHANGE, OnChange) .E}fk,hLB
//}}AFX_MSG_MAP k44sV.G4L
END_MESSAGE_MAP() L;$Gn"7~
unu%\f>^4
BOOL CCaptureDlg::OnInitDialog() $}RBK'cr}
{ gBb+Q,
CDialog::OnInitDialog(); 3*C9;Q}
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |pxM8g1w
ASSERT(IDM_ABOUTBOX < 0xF000); L]I ;{Y
CMenu* pSysMenu = GetSystemMenu(FALSE); r(-`b8ZE
if (pSysMenu != NULL) W,dqk=n
{ de{@u<YZb
CString strAboutMenu; F,}wQN
strAboutMenu.LoadString(IDS_ABOUTBOX); l2Z!;Wm(
if (!strAboutMenu.IsEmpty()) @)=\q`vV
{ F_0vh;Jo
pSysMenu->AppendMenu(MF_SEPARATOR); TY}9;QL:
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); kSj,Pl\NC
} :H($|$\h
} 7(c7-
SetIcon(m_hIcon, TRUE); // Set big icon V9\g?w
SetIcon(m_hIcon, FALSE); // Set small icon Z9TmX
A@
m_Key.SetCurSel(0); 9NX f~-V-
RegisterHotkey(); 2k}~"!e1
CMenu* pMenu=GetSystemMenu(FALSE); aoj6/
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); | LdDL953
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zMlW)NB'
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2VObj7F
return TRUE; // return TRUE unless you set the focus to a control ?IgM=@
}
%GS^=Qr
vt)u`/u
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <^>O<P:v
{ ,SQmQ6h
if ((nID & 0xFFF0) == IDM_ABOUTBOX) _"Yi>.{]
{ bV c"'RQ
CAboutDlg dlgAbout; &L6xagR7M
dlgAbout.DoModal(); FVw;`{
} g2Pa-}{
else NvCq5B$C
{ %6Wv-:LY
CDialog::OnSysCommand(nID, lParam); O6JH )Ka"S
} j"g[qF/*
} P X/{
5WJof`M
void CCaptureDlg::OnPaint() +b@KS"3h
{ !Ab4'4f
if (IsIconic()) esE5#Yq4.k
{ b5WtL+Z
CPaintDC dc(this); // device context for painting z+IHt(
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O*%
1
// Center icon in client rectangle 7;0$UYDU*
int cxIcon = GetSystemMetrics(SM_CXICON); ,m ^q>
int cyIcon = GetSystemMetrics(SM_CYICON); n:QFwwQ`Q;
CRect rect; ^yLiyR e\
GetClientRect(&rect); IJX75hE0g
int x = (rect.Width() - cxIcon + 1) / 2; 'Pk14`/
int y = (rect.Height() - cyIcon + 1) / 2; es]S]}JV
// Draw the icon o[<lTsw<
dc.DrawIcon(x, y, m_hIcon); tx0`#x
} 9?M>Y?4
else .A 12Co
{ 2e~ud9,
CDialog::OnPaint(); {|dU|h
} -jN:~.
} G.Z4h/1<
Z*r;"WHB
HCURSOR CCaptureDlg::OnQueryDragIcon() q u>5 rg-
{ EPO*{bN7O
return (HCURSOR) m_hIcon; Tgxxm
} $'m&RzZ
%K@s0uQ
void CCaptureDlg::OnCancel() bWp40&vx
{ m]}%Ag^x
if(bTray) { zGM[A
DeleteIcon(); &U<t*"
CDialog::OnCancel(); #$/SM_X14C
} P!uwhha/g
H# P)n
R
M
void CCaptureDlg::OnAbout() H_3-"m &3
{ H{&o_
CAboutDlg dlg; o]Ln:k l
dlg.DoModal(); #L,>)Xk jS
} rID_^g_tP8
vpTYfE
void CCaptureDlg::OnBrowse() 4(2iR0N
{ a-nf5w>&q
CString str; 24)Sf
BROWSEINFO bi; |n9q4*dN
char name[MAX_PATH]; /m>%=_nz
ZeroMemory(&bi,sizeof(BROWSEINFO)); !\e&7sV~Q
bi.hwndOwner=GetSafeHwnd(); \gtI4zl*J
bi.pszDisplayName=name; E]Wnl\Be
bi.lpszTitle="Select folder"; >|Xy'ZR
bi.ulFlags=BIF_RETURNONLYFSDIRS; kd0~@rPL
LPITEMIDLIST idl=SHBrowseForFolder(&bi); b
\pjjb[
if(idl==NULL) 4i<V^go"
return; BNA` Cc1VV
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,Oqd4NS
str.ReleaseBuffer(); /K+GM8rtE
m_Path=str; L
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if(str.GetAt(str.GetLength()-1)!='\\') }Z^r<-N
m_Path+="\\"; 4[q'1N6-
UpdateData(FALSE); ^Ob#B!=
} W
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*^h$%<QI
void CCaptureDlg::SaveBmp() D I`
M
{ f[S$Gu4-
CDC dc; .nGYx
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ry99R|/d1
CBitmap bm; pUTC~|j%:
int Width=GetSystemMetrics(SM_CXSCREEN); V%kZ-P*
int Height=GetSystemMetrics(SM_CYSCREEN); CuS"Wj
bm.CreateCompatibleBitmap(&dc,Width,Height); A4C4xts]N
CDC tdc; FrPpRe %!
tdc.CreateCompatibleDC(&dc); l~cT]Ep
CBitmap*pOld=tdc.SelectObject(&bm); %Fb4
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); kaKV{;UM
tdc.SelectObject(pOld); jGp|:!'w
BITMAP btm; .JkcCEe{G
bm.GetBitmap(&btm); D7'P^*4_B
DWORD size=btm.bmWidthBytes*btm.bmHeight; ^;KL`
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (C1@f!Z
BITMAPINFOHEADER bih; >pS@;t'
bih.biBitCount=btm.bmBitsPixel; vbol70
bih.biClrImportant=0; ,[ogh
bih.biClrUsed=0; Y(:.f-Du
bih.biCompression=0; O(P
,!
bih.biHeight=btm.bmHeight; ="M7F0k
bih.biPlanes=1; 0O_acO4
bih.biSize=sizeof(BITMAPINFOHEADER); \I3={ii0
bih.biSizeImage=size; ]7#@lL;'0
bih.biWidth=btm.bmWidth; \QpH~&QIS
bih.biXPelsPerMeter=0; iJIDx9 )Z
bih.biYPelsPerMeter=0; d{~5tv- H
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =CCxY7)M+.
static int filecount=0; 4^? J BpBZ
CString name; >'qkW$-95
name.Format("pict%04d.bmp",filecount++); Dg:2*m_!j{
name=m_Path+name; 4 nIs+
BITMAPFILEHEADER bfh; >_ )~"Ra
bfh.bfReserved1=bfh.bfReserved2=0; {e>E4(
bfh.bfType=((WORD)('M'<< 8)|'B'); IV#kF}9$
bfh.bfSize=54+size; KINKq`Sx
bfh.bfOffBits=54; &HS6}
CFile bf; hM":?Rx
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ W0++q=F
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); AX
{~A:B
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %`o3YR
bf.WriteHuge(lpData,size); k1EAmA
l
bf.Close(); "CS{fyJ
nCount++; M*& tVG
} S6J7^'h
GlobalFreePtr(lpData); yUZ;keQ_Tw
if(nCount==1) !A5UT-
m_Number.Format("%d picture captured.",nCount); $U{\T4
else
]+ \]2`?
m_Number.Format("%d pictures captured.",nCount); ?2;gmZd7
UpdateData(FALSE); hH=H/L_Z
} Q%x |
3A~53W$M
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) n'dxa<F2|
{ Pk94O
if(pMsg -> message == WM_KEYDOWN) 3I rmDT
{ Do&em8i
z
if(pMsg -> wParam == VK_ESCAPE) R0 g-
return TRUE; 1|+Zmo"
if(pMsg -> wParam == VK_RETURN) Pf?*bI
return TRUE; ,gvv297
} ujo3"j[b
return CDialog::PreTranslateMessage(pMsg); l1Zf#]x
} ) \iOwA
hx'p0HDta
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @M:Uf7
{ %*>ee[^L ,
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \~3g*V
SaveBmp(); jz\LI
return FALSE; yNwYP%"y
} #i#4h<R
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @0XqUcV
CMenu pop; [sM~B
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qre.^6x
CMenu*pMenu=pop.GetSubMenu(0); =bVaB<!
pMenu->SetDefaultItem(ID_EXITICON); aNqhxvwf
CPoint pt; YW|KkHi*
GetCursorPos(&pt); "IK QFt'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); q#8$@*I
if(id==ID_EXITICON) H*l2,0&W
DeleteIcon(); 9M$=X-
else if(id==ID_EXIT) "y %S.ipWG
OnCancel(); 4 Ar\`{c>
return FALSE; $LS$:%i4
} fgb%SIi?
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dkz79G}e
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) GzJ("RE0)v
AddIcon(); {V> >a
return res; rv(Qz|K@
} -^y$RJC
YQB. 3
void CCaptureDlg::AddIcon() HzW`j"\
{ CB<i
NOTIFYICONDATA data; YKjm_)8]w
data.cbSize=sizeof(NOTIFYICONDATA); 8=]R6[,fD
CString tip; -SZW[T<N"
tip.LoadString(IDS_ICONTIP); l7{Xy_66
data.hIcon=GetIcon(0); l9U^[;D
data.hWnd=GetSafeHwnd(); )PM&x
strcpy(data.szTip,tip); qRD]Q
data.uCallbackMessage=IDM_SHELL; Z3ucJH/)V
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Qx9lcO_
data.uID=98; a0vg%Z@!
Shell_NotifyIcon(NIM_ADD,&data); t@a2@dX|
ShowWindow(SW_HIDE); C?UV3
bTray=TRUE; ZDmBuf
q
} QzjLKjl7p4
^%^~:<N
void CCaptureDlg::DeleteIcon() 0>uMR{ #
{ Q%.V\8#|V
NOTIFYICONDATA data; 4X0k1Fw)Y
data.cbSize=sizeof(NOTIFYICONDATA); [Rz9Di ;
data.hWnd=GetSafeHwnd(); E^I|%F
data.uID=98; Us4ijR d
Shell_NotifyIcon(NIM_DELETE,&data); vgfLI}|5
ShowWindow(SW_SHOW); =:T pH>f*
SetForegroundWindow(); "?I ]h
ShowWindow(SW_SHOWNORMAL); (GLd"Zq
bTray=FALSE; T.1*32cX
} gFJ.
p
aY^_+&&G
void CCaptureDlg::OnChange() dS7?[[pg9
{ L*2YAIG
RegisterHotkey(); cx]&ae *
} jQAK
?7':=
__}j
{Buk
BOOL CCaptureDlg::RegisterHotkey() mL!)(Bb
{ Q4gsOxP
UpdateData(); +?xW%omy
UCHAR mask=0; +doZnU,
UCHAR key=0; -}l iG
if(m_bControl) &N{XLg>
mask|=4; /V66P@[>
if(m_bAlt) F,Ls1
mask|=2; 0]tr&BLl*
if(m_bShift) ={Bcbj{
mask|=1; 4I"p>FIkY
key=Key_Table[m_Key.GetCurSel()]; [m>kOv6>^
if(bRegistered){ eq0&8/=
DeleteHotkey(GetSafeHwnd(),cKey,cMask); aS^
4dEJ
bRegistered=FALSE; "3kIQsD|j
} b)+;#m
cMask=mask; s~ZLnEb
cKey=key; `QH-VR\_
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); NaeG2>1
return bRegistered; x|#R$^4CY
} PcXz4?Q$
S#IlWU
四、小结 Cr?|bDv}o
!J 3dlUFRO
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。