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:
&HqBlRo
z :A_ 一、实现方法
nlc$"(eA[H QGnUPiD^ 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:
VP1z"j: Dp?lgw #pragma data_seg("shareddata")
,S&p\(r. HHOOK hHook =NULL; //钩子句柄
bMqFrG UINT nHookCount =0; //挂接的程序数目
{wf5HA static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
u/J1Z>0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
tSVS ogGd static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
RvyCc!d static int KeyCount =0;
HgTBON( static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
zw0u|q;# #pragma data_seg()
Y,-!QFS# X: QRy9] 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。
pwA~?$B1 =TA8]7S~U 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:
7LiyA< jEL"Q?# BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
$?DEO[p. cKey,UCHAR cMask)
,2mq}u>WU {
n/%M9osF BOOL bAdded=FALSE;
q<cxmo0S for(int index=0;index<MAX_KEY;index++){
>oapw5~5 if(hCallWnd[index]==0){
<Kk?BRxi hCallWnd[index]=hWnd;
D@m3bsMwe HotKey[index]=cKey;
hwSxdT6 HotKeyMask[index]=cMask;
?2K~']\S bAdded=TRUE;
l=<},_]{ KeyCount++;
S) `@)sr break;
w3"%d~/[x }
n9V8A[QJ }
5e^z]j1Yv return bAdded;
5a:YzQ4 }
OUy}1%HY //删除热键
9 6%N BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
n
m.5!. {
WdbHT|.Aj BOOL bRemoved=FALSE;
[f]:hJi for(int index=0;index<MAX_KEY;index++){
!j9(%,PR if(hCallWnd[index]==hWnd){
PVrNS7 Rk/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q,=YKw)* hCallWnd[index]=NULL;
"||'
-(0 HotKey[index]=0;
yp<)v(8|' HotKeyMask[index]=0;
dlwOmO'Bm) bRemoved=TRUE;
:DFtH13qO KeyCount--;
SOluTFxUw break;
vtRz;~,Z }
zT'(I6S:) }
Q 34-a"6) }
;33SUgX return bRemoved;
J>fq5 }
5L,q,kVS S~^]ib0 /&5:v%L DLL中的钩子函数如下:
N"zl7 .E L8KaK LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
CUj$ <ay= {
u|(Iu}sE= BOOL bProcessed=FALSE;
b\H,+|iK if(HC_ACTION==nCode)
J4?SC+\ {
xj JoWB if((lParam&0xc0000000)==0xc0000000){// 有键松开
VI)hA
^S switch(wParam)
SU(J {
xN6}4JB case VK_MENU:
a@#<qf8g MaskBits&=~ALTBIT;
+#6f)H(P] break;
R xc case VK_CONTROL:
G9CL}=lJ, MaskBits&=~CTRLBIT;
J!yK/*sO, break;
M[L@ej case VK_SHIFT:
8]WcW/1r ! MaskBits&=~SHIFTBIT;
s 4n<k]d break;
i1!Y{ default: //judge the key and send message
&0OH:P% break;
B.#-@ }
>bg{ for(int index=0;index<MAX_KEY;index++){
hfs QAa if(hCallWnd[index]==NULL)
bUc++M continue;
hPt=j{aJ%< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^CB@4$! {
PrF('PH7i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3lgD,_& bProcessed=TRUE;
x6Q_+!mnk }
\psO$TxF= }
T;3B_lu] }
0&c<1; else if((lParam&0xc000ffff)==1){ //有键按下
Rd|^C$6 switch(wParam)
J$&2GAi {
rWJKK case VK_MENU:
9/O\769"' MaskBits|=ALTBIT;
m
[BV{25 break;
\mw5
~Rf; case VK_CONTROL:
>dwY(a MaskBits|=CTRLBIT;
H h%|}*f_, break;
'i 8`LPQ case VK_SHIFT:
pMkM@OH
MaskBits|=SHIFTBIT;
+l<;?yk:; break;
|C7=$DgwY default: //judge the key and send message
%
xBQX break;
}1NNXxQ }
;s5JYR for(int index=0;index<MAX_KEY;index++){
I3 YSW if(hCallWnd[index]==NULL)
3
op{h6 continue;
th+LScOX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~2QD.( {
hjp,v)# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
TZarI-A bProcessed=TRUE;
vh^?M#\ }
,+FiP{` }
+aOX{1w }
;Ehv1{; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
m4G))||9Q for(int index=0;index<MAX_KEY;index++){
K^%ONultv if(hCallWnd[index]==NULL)
4"Mq]_D continue;
LKst
QP!I if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
B8zc#0!1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`bZgw //lParam的意义可看MSDN中WM_KEYDOWN部分
^C;ULUn3 }
|43Oc:Ah+ }
i \@a&tw }
D*ZswHT{y return CallNextHookEx( hHook, nCode, wParam, lParam );
"1hFx=W+\ }
'w_Qs~6~{ y.::d9v 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
l$C
Y
gm _:!7M^IU BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;;Jx1Q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Pe`jNiI `Yyi;!+0 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:
`dIwBfg_ aO*v"^oF LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
KuMH,rXF {
n{"a0O if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
U Fyk%#L {
iO}KERfU //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1}OM"V SaveBmp();
@Z
Dd(xB& return FALSE;
i.e4<|{ }
I\|.WrMNi …… //其它处理及默认处理
cPX^4d~9 }
mH )i L!~ap j-t" 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。
B\+uRiD8w 18>v\Hi< 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。
K8h\T4 ]qiX"<s>~C 二、编程步骤
F:LrQu (dHjf; 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";
FPu$N d&\ 1?,C d 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
'-P+|bZW4 WpC9(AX5g 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
J#\oc@ W4)bEWO+q 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
yn.[- TpxAp',#7 5、 添加代码,编译运行程序。
u"DE? CM)V^k* 三、程序代码
?3<Y/Vg%c
Fp>nu _-" ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
LXf|n #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
40 zO4 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
c, }VC- #if _MSC_VER > 1000
xggF:El3{ #pragma once
\9]-(j6[H #endif // _MSC_VER > 1000
n'!x"O7 #ifndef __AFXWIN_H__
Au*1- #error include 'stdafx.h' before including this file for PCH
c~!ETwpHQ #endif
.>Fpk7 #include "resource.h" // main symbols
%{0F. class CHookApp : public CWinApp
'Qg.D88 {
&5QvUn public:
dEam| CHookApp();
%I@vM s^ // Overrides
P|TM4i] // ClassWizard generated virtual function overrides
/`j2%8^N //{{AFX_VIRTUAL(CHookApp)
|Gr@Mi5 public:
P[r$KGz virtual BOOL InitInstance();
TNF virtual int ExitInstance();
c!mMH~# //}}AFX_VIRTUAL
WnA
Y<hZ| //{{AFX_MSG(CHookApp)
=Ea,8bpn // NOTE - the ClassWizard will add and remove member functions here.
{8,_[?H // DO NOT EDIT what you see in these blocks of generated code !
Q<(aU{ //}}AFX_MSG
SZvC4lOn# DECLARE_MESSAGE_MAP()
7yOBxb };
sY?sQ'E2] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=]1g*~% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Ho $+[K BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}$s QmRR BOOL InitHotkey();
t|*UlTLm BOOL UnInit();
3A\Z]L #endif
]hZk#rp} /buj(/q^# //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Y\F4 #include "stdafx.h"
CiTWjE?|7 #include "hook.h"
9fsc>9 #include <windowsx.h>
)M@^Z(W/a #ifdef _DEBUG
F1p|^hYDW #define new DEBUG_NEW
L+0:'p= #undef THIS_FILE
97pnq1b static char THIS_FILE[] = __FILE__;
%1)J Rc #endif
zbfe=J4c #define MAX_KEY 100
m3XT8F*& #define CTRLBIT 0x04
j?VHR$ #define ALTBIT 0x02
V(Oi!(H;v #define SHIFTBIT 0x01
S(0JBGC #pragma data_seg("shareddata")
S`vw<u4t HHOOK hHook =NULL;
He&A>bA)z UINT nHookCount =0;
V>ZDJW"G! static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
rw?wlBEG% static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
8yM8O
#S static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
?F~0\T,7 static int KeyCount =0;
jH<,dG:{ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
L5CnPnF #pragma data_seg()
(@S9>z4s HINSTANCE hins;
|I3&a=, void VerifyWindow();
,<[x9 "3\ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
MPLeqk$; //{{AFX_MSG_MAP(CHookApp)
tZ:fOM // NOTE - the ClassWizard will add and remove mapping macros here.
ACF_;4%& // DO NOT EDIT what you see in these blocks of generated code!
.:tR*Kst`7 //}}AFX_MSG_MAP
a&[>kO END_MESSAGE_MAP()
]NKz5[9D EW/N H&{ CHookApp::CHookApp()
'lmjZ{k {
2L=(-CH9] // TODO: add construction code here,
\!k\%j9 // Place all significant initialization in InitInstance
A@reIt }
>"Zn#
FY {_ZbPPh;M" CHookApp theApp;
nFwdW@E9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!k#N]
9D3 {
|@hyGu-H+ BOOL bProcessed=FALSE;
@Y#TWt# if(HC_ACTION==nCode)
X"%eRW&qu/ {
^b*ub(5Ot if((lParam&0xc0000000)==0xc0000000){// Key up
am/D$ (l1 switch(wParam)
xFyBF[c {
eGo$F2C6E case VK_MENU:
HN<e)E38 MaskBits&=~ALTBIT;
?yA
2N; break;
_V` QvnT} case VK_CONTROL:
~L.5;8a3Pe MaskBits&=~CTRLBIT;
{(h!JeQ break;
7*4i0{] case VK_SHIFT:
<lWBhrz MaskBits&=~SHIFTBIT;
~u r}6T break;
x_= 3!) default: //judge the key and send message
8_3WCbe/ break;
h9rrkV9 }
,u14R] for(int index=0;index<MAX_KEY;index++){
\*c=bz&l if(hCallWnd[index]==NULL)
s*vtCdrE.
continue;
.C1g Dry] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pWKI^S {
AS lmW@/9v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~)5k%?. bProcessed=TRUE;
sO)!}#,
}
N]G`] }
.G|U#%"6x }
o^u}(wZ{ else if((lParam&0xc000ffff)==1){ //Key down
=E&1e;_xlE switch(wParam)
e(9K.3@{ {
mHNqzdaa case VK_MENU:
~~#/jULbV MaskBits|=ALTBIT;
C 6d#+ break;
ZV[-$ case VK_CONTROL:
r1sA^2g. MaskBits|=CTRLBIT;
t_qX7P8+' break;
tz2$j@!= case VK_SHIFT:
/q^_
'Lp MaskBits|=SHIFTBIT;
h\8bo= break;
j)}TZx4~ default: //judge the key and send message
:{?Pq8jP break;
,MD>Jx| }
$ccCI
\ for(int index=0;index<MAX_KEY;index++)
i^eDM.#X {
5gwEr170 if(hCallWnd[index]==NULL)
[LS s|f continue;
^_o:Ddz?l" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
n'@XgUI, {
Ky{C;7X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~P9^4 bProcessed=TRUE;
x8&~ }
C3; d.KlV }
?$b*)< }
7[8d-Sf24{ if(!bProcessed){
g]._J for(int index=0;index<MAX_KEY;index++){
5~"m$/yE if(hCallWnd[index]==NULL)
ZMch2 U8 continue;
3UJSK+d\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ak(P<OC- SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#}8gHI-9% }
mMad1qCi7 }
5
Praj }
>n>gX/S<C return CallNextHookEx( hHook, nCode, wParam, lParam );
6!RKZj) }
8HdjZ! Na`vw BOOL InitHotkey()
q?#w%0} {
z!^3%kJJ> if(hHook!=NULL){
9RY}m7 nHookCount++;
`_M&zN return TRUE;
kk
aS&r> }
u2l`%
F`x else
1i
6>~ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
~-NlTx if(hHook!=NULL)
d C6t+ nHookCount++;
o[nr) return (hHook!=NULL);
qox@_ }
|exjrsmM* BOOL UnInit()
bd`}2vr {
Y^,G}
&p if(nHookCount>1){
0j[%L!hny nHookCount--;
~Yl%{1 return TRUE;
o]0\Km }
M\=/i\- BOOL unhooked = UnhookWindowsHookEx(hHook);
/^Zgv-n if(unhooked==TRUE){
0+_:^z nHookCount=0;
yzz(<s:o/ hHook=NULL;
)H<F([Jri }
y;tX`5(fe return unhooked;
A<cnIUW }
K<"Y4O#] 9icy&' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:4S~}}N {
5~xv"S(E} BOOL bAdded=FALSE;
4+au6ABy for(int index=0;index<MAX_KEY;index++){
/Y*6mQ: if(hCallWnd[index]==0){
U\;mM\2rE hCallWnd[index]=hWnd;
}I#,o!)Vd HotKey[index]=cKey;
Tv~Ys# HotKeyMask[index]=cMask;
OyTp^W`& bAdded=TRUE;
<{A |Xs KeyCount++;
UC?i>HsJrX break;
(k>I!Z/&2 }
M!]g36h[ }
U("m}^ return bAdded;
|?<r }
EP]O J$6I l1}HJmom BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o%?~9rf]] {
M\be a BOOL bRemoved=FALSE;
8f-B-e?k for(int index=0;index<MAX_KEY;index++){
LF_am*F if(hCallWnd[index]==hWnd){
N`!=z++G if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#W=H)6 hCallWnd[index]=NULL;
R>`TV(W`9 HotKey[index]=0;
OwG:+T_ HotKeyMask[index]=0;
Ih5F\eM bRemoved=TRUE;
H%`|yUE( KeyCount--;
/mFa*~dj2 break;
g+92}$_ }
N+0`Jm }
<!.Qn
Y }
5SmgE2 } return bRemoved;
1N\-Ku }
u7ER NW@guhK. void VerifyWindow()
.eM
A*C~n {
X4:SH>U! for(int i=0;i<MAX_KEY;i++){
(= ,w$ if(hCallWnd
!=NULL){ rQD7ZN_ R
if(!IsWindow(hCallWnd)){ ,#QLc
hCallWnd=NULL; gjhWoZV
HotKey=0; dFVm18
HotKeyMask=0; ,daZKxT
KeyCount--; tz"zQC$
} {w|KWGk2
} N"#=Q=)x
} 5K %
} 9x9~u8j
9='=wWW
BOOL CHookApp::InitInstance() jCv%[H7
{ z9[BQ(9t
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4?9cyv4H
hins=AfxGetInstanceHandle(); 4+_r0
InitHotkey(); }@S''AA\
return CWinApp::InitInstance(); :6X?EbXhK
} L
BP|
0'.7dzz
int CHookApp::ExitInstance() YkbZ 2J*-
{ M4(`o^n
VerifyWindow(); ITu5Y"x
UnInit(); G u P1
return CWinApp::ExitInstance(); 60&4?<lR4
} p(]o#$ 6[
aw8q}:
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ia}V8i
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CNF3".a
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #9)D.d|5
#if _MSC_VER > 1000 t|y`Bl2
#pragma once $6p|}<u
#endif // _MSC_VER > 1000 B\}B
H
5(sWV:_2
class CCaptureDlg : public CDialog gXI8$W>
{ F),wj8#~>-
// Construction 5W=jQ3 C
public: &fYV FRVkq
BOOL bTray; .kkrU
BOOL bRegistered; KQ(7% W
BOOL RegisterHotkey(); 1P+Te,I
UCHAR cKey; IHlTp0?
UCHAR cMask; l&1R`g cW
void DeleteIcon(); nofK(0TF
void AddIcon(); juc;]CHt'
UINT nCount; 3m9ab"
void SaveBmp(); )dgooq
CCaptureDlg(CWnd* pParent = NULL); // standard constructor -^%YrWgd?
// Dialog Data $"G=r(MW
//{{AFX_DATA(CCaptureDlg) ^|0>&sTHOH
enum { IDD = IDD_CAPTURE_DIALOG }; ?yqTLj
CComboBox m_Key; NN;'QiE
BOOL m_bControl; ]aF!0Fln~
BOOL m_bAlt; 7-Yn8Gq
BOOL m_bShift; -N]%)Hy
CString m_Path; XY1eeB-
CString m_Number; nm597WeZp
//}}AFX_DATA 8hx 3pvmk
// ClassWizard generated virtual function overrides Rg?m$$X`
//{{AFX_VIRTUAL(CCaptureDlg) ~9KxvQzt
public: 1-M\K^F
virtual BOOL PreTranslateMessage(MSG* pMsg); \P` mV9P
protected: aV'r
oxM
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (]l}QR%Bxu
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6#rj3^]
//}}AFX_VIRTUAL j >wT-s
// Implementation `K^j:fE7n
protected: 8P#jC$<
HICON m_hIcon; DNN60NX 5Q
// Generated message map functions ?g21U97Q
//{{AFX_MSG(CCaptureDlg) Y$SwQ;wl
virtual BOOL OnInitDialog(); y! lEGA7
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); BRg(h3 ED
afx_msg void OnPaint(); ^cy.iolt
afx_msg HCURSOR OnQueryDragIcon(); 'U"ub2j
virtual void OnCancel(); T@ecWRro
afx_msg void OnAbout(); uqg#(ADy?R
afx_msg void OnBrowse(); Px<*n '~}
afx_msg void OnChange(); GcL:plz
//}}AFX_MSG <!r0[bKz@
DECLARE_MESSAGE_MAP() /Ky xOb)
}; P}Ud7Vil;l
#endif ~20O&2
3LaqEj
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /?,c4K,ap
#include "stdafx.h" &XnbZ&_
#include "Capture.h" %w YGI
#include "CaptureDlg.h" .s)z?31
#include <windowsx.h> jml
4YaG Z
#pragma comment(lib,"hook.lib") 5|E_ ,d!v
#ifdef _DEBUG c5t],P
#define new DEBUG_NEW >pV|c\
#undef THIS_FILE `zJTVi4
static char THIS_FILE[] = __FILE__; >sL"HyY#H
#endif `V1D&}H+G
#define IDM_SHELL WM_USER+1 'kz[Gh*8
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V!Q1o!J
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Alsr6uLT1
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -%*w&',G
class CAboutDlg : public CDialog 0DFxVH_xN
{ mar
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public: eaI!}#>R+
CAboutDlg(); `f9I#B
// Dialog Data UF)4K3X
//{{AFX_DATA(CAboutDlg) #l!Sz247
enum { IDD = IDD_ABOUTBOX }; KF#,Q
//}}AFX_DATA 3'H 1T
// ClassWizard generated virtual function overrides y~cDWD<h
//{{AFX_VIRTUAL(CAboutDlg) *Q@%<R
protected: ^mu?V-4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >lRa},5(
//}}AFX_VIRTUAL _k,/t10
// Implementation ^\X-eeA
protected: Yb<t~jm
//{{AFX_MSG(CAboutDlg) `n#
{} %
//}}AFX_MSG zMUifMiAj
DECLARE_MESSAGE_MAP() $]G_^ji)K
}; JY|f zL
];.H]TIc6
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Xy>+r[$D:
{
'7!b#if
//{{AFX_DATA_INIT(CAboutDlg) D-[`wCa,
//}}AFX_DATA_INIT YuZxKuGy
} X$L9kZ
\Ami-<T
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Lwg@*:`d
{ 0koC;(<n
CDialog::DoDataExchange(pDX); "Yo.]PU
//{{AFX_DATA_MAP(CAboutDlg) pL{h1^O}
//}}AFX_DATA_MAP J 1?)z+t9~
} PN!NB.
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8}&O7zO?
//{{AFX_MSG_MAP(CAboutDlg) MMMuT^X
// No message handlers <3wfY
#;><
//}}AFX_MSG_MAP i U^tv_1
END_MESSAGE_MAP() <4gT8kQ$x
.."=
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D=w5Lks
: CDialog(CCaptureDlg::IDD, pParent) _oB!-#
{ w+P?JR!)+
//{{AFX_DATA_INIT(CCaptureDlg) )>]~ Y
m_bControl = FALSE; Wb_'X |"u
m_bAlt = FALSE; Wgt[ACioN
m_bShift = FALSE; OIuEC7XM^C
m_Path = _T("c:\\"); O43emL3
m_Number = _T("0 picture captured."); #)aUKFX
nCount=0; iI27N'g
bRegistered=FALSE; liW0v!jBo
bTray=FALSE; @w)Vt$+b]
//}}AFX_DATA_INIT 1CkBfK
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0i[,`>-Av
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /e^q>>z
} XNwZSW
.kl _F7
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) W?5u O
{ N{}XHA
CDialog::DoDataExchange(pDX); f_*Bd.@
//{{AFX_DATA_MAP(CCaptureDlg) 1N#KVvK
DDX_Control(pDX, IDC_KEY, m_Key); 8\+Q*7~@i
DDX_Check(pDX, IDC_CONTROL, m_bControl); Jon<?DQj
DDX_Check(pDX, IDC_ALT, m_bAlt); e5!LbsJv
DDX_Check(pDX, IDC_SHIFT, m_bShift); H]LH~l
DDX_Text(pDX, IDC_PATH, m_Path); i )Hjmf3
DDX_Text(pDX, IDC_NUMBER, m_Number); nQ/R,+6h
//}}AFX_DATA_MAP 4,o|6H
} L#Mul&r3x0
YxEc(a"
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) U2=PmS P
//{{AFX_MSG_MAP(CCaptureDlg) t;7 tuq
ON_WM_SYSCOMMAND() v-;j44sB
ON_WM_PAINT() p#VA-RSUQ|
ON_WM_QUERYDRAGICON() N|n"JKw)
ON_BN_CLICKED(ID_ABOUT, OnAbout) ,4bqjkX5q
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9oly=&lJ
ON_BN_CLICKED(ID_CHANGE, OnChange) W0]W[b,:u$
//}}AFX_MSG_MAP a=<l}`*
END_MESSAGE_MAP() Le&SN7I
r sf +dC
BOOL CCaptureDlg::OnInitDialog() ]V,wIyC
{ -lKk.Y.}r
CDialog::OnInitDialog(); L'dR;T[;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,)u\G(N
ASSERT(IDM_ABOUTBOX < 0xF000); 7V6gT}R
CMenu* pSysMenu = GetSystemMenu(FALSE); 1LbJR'}
if (pSysMenu != NULL) T)"B35
{ n+db#qAj5
CString strAboutMenu; X>Cl{.
strAboutMenu.LoadString(IDS_ABOUTBOX); B|Y6;4?
if (!strAboutMenu.IsEmpty()) (mHCK5
{ 481SDG[b
pSysMenu->AppendMenu(MF_SEPARATOR); dqU
bJc]
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +Ar=89
} "~y@rqIba
} qNI2+<u)j
SetIcon(m_hIcon, TRUE); // Set big icon ('q u#.'
SetIcon(m_hIcon, FALSE); // Set small icon (Kl96G<Wej
m_Key.SetCurSel(0); J2\%rb,
RegisterHotkey(); [FHSFr
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CMenu* pMenu=GetSystemMenu(FALSE); Q+
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pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1(z&0Y ;
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _ lrCf
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >wiW(Ki}
return TRUE; // return TRUE unless you set the focus to a control A
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} $F|3VQ~
[whX),3>
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l6^IX0&p
{ f;<qGM.#|
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4{?Djnh
{ Y#9dVUS
CAboutDlg dlgAbout; EV}c,*);y
dlgAbout.DoModal(); K
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} $Hr
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else (Sr D
{ D -Goi-4
CDialog::OnSysCommand(nID, lParam); x7qVLpcL3z
} }@
Nurs)%_
} b5kw*h+/'h
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void CCaptureDlg::OnPaint() [<;4$}f\
{ 6xk~Bt
if (IsIconic()) v7?sXW
{ }P8@\2@=T
CPaintDC dc(this); // device context for painting ;Kq/[$~0
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {\!_S+}{
// Center icon in client rectangle 3urL*Fw,
int cxIcon = GetSystemMetrics(SM_CXICON); %:bTOw[4r
int cyIcon = GetSystemMetrics(SM_CYICON); ][b_l(r$?
CRect rect; !a"RHg:HO
GetClientRect(&rect); 0^l|W|.Z
int x = (rect.Width() - cxIcon + 1) / 2; L*TPLS[lh
int y = (rect.Height() - cyIcon + 1) / 2; xz1jRI$
// Draw the icon ][ri
A
dc.DrawIcon(x, y, m_hIcon); %UEV['=
} 's.%rre%
else UZ8
vZ
{ 8!a6)Zeux
CDialog::OnPaint(); Q;m:o8Q5
} #/u% sX`#y
} &/K:zWk3mx
7X\azL
HCURSOR CCaptureDlg::OnQueryDragIcon() !&f(Xs
{ vYT%e:8)q
return (HCURSOR) m_hIcon; Nqih LUv
} 3z^l
X2avo|6e
void CCaptureDlg::OnCancel() k 7 !{p
{ H-&Z+4 +Xs
if(bTray) vmOye/?k
DeleteIcon(); o.|36#Fa
CDialog::OnCancel(); Er$&}9G+-
} yLXIjR
uX{g4#eG
void CCaptureDlg::OnAbout() TPkP5w
{ [5-IkT0
CAboutDlg dlg; )w&|VvM )L
dlg.DoModal(); ^e =xEZD
} vfhoN]v
$/JXI?K
void CCaptureDlg::OnBrowse() RhF<{U.
{ a5pM ~.]
CString str; Pjvb}q=
BROWSEINFO bi; eL)m(
char name[MAX_PATH]; iny/K/5bf
ZeroMemory(&bi,sizeof(BROWSEINFO)); %zEy.7Ux
bi.hwndOwner=GetSafeHwnd(); %'=TYvB 2
bi.pszDisplayName=name; U Lq`!1{
bi.lpszTitle="Select folder"; QJR},nZ3
bi.ulFlags=BIF_RETURNONLYFSDIRS; O)&ME
LPITEMIDLIST idl=SHBrowseForFolder(&bi); uP8 cW([
if(idl==NULL) k`[>Bk%b
return; P$AHw;n[R
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &A/b9GW^-
str.ReleaseBuffer(); 7OXRR)]V
m_Path=str; =*+f2
if(str.GetAt(str.GetLength()-1)!='\\') D( TfW
m_Path+="\\"; AOL=;z9c#
UpdateData(FALSE); PV=sqLM~
} &n83>Q
RCK* ?\m5
void CCaptureDlg::SaveBmp() Y}yh6r;i
{ 9T`YHA'g
CDC dc; |@R/JGB^
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ly
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CBitmap bm; @RoU
int Width=GetSystemMetrics(SM_CXSCREEN); mN R}%s
int Height=GetSystemMetrics(SM_CYSCREEN); g}9heR
bm.CreateCompatibleBitmap(&dc,Width,Height); [6.<#_~{
CDC tdc; #zSNDv`
tdc.CreateCompatibleDC(&dc); h.- o$+Sa
CBitmap*pOld=tdc.SelectObject(&bm); X
)
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tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); aGE}
EK }
tdc.SelectObject(pOld); vt(n: Xk
BITMAP btm; c1*^
\
bm.GetBitmap(&btm); "8(8]GgYx
DWORD size=btm.bmWidthBytes*btm.bmHeight; !>K=@9NC|.
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); YxU->Wi]G
BITMAPINFOHEADER bih; \sW>Y#9]
bih.biBitCount=btm.bmBitsPixel; !@ AnwV]
bih.biClrImportant=0; F<2gM#jLB
bih.biClrUsed=0; O0pXHXSAL
bih.biCompression=0; *8%uXkM m
bih.biHeight=btm.bmHeight; iQCs8hIR
bih.biPlanes=1; _qt
bih.biSize=sizeof(BITMAPINFOHEADER); s6 K~I
bih.biSizeImage=size; v Oo^H
bih.biWidth=btm.bmWidth; P$clSJW
bih.biXPelsPerMeter=0; ?&U~X)Q
bih.biYPelsPerMeter=0; kqC7^x
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S|yDGT1
static int filecount=0; dOgc%(kz
CString name; mwz!7Q
name.Format("pict%04d.bmp",filecount++); H6$pA^
name=m_Path+name; _R
;$tG,
BITMAPFILEHEADER bfh; '=K~M
bfh.bfReserved1=bfh.bfReserved2=0; "Nq5FcS9
bfh.bfType=((WORD)('M'<< 8)|'B'); vsI|HxpyC,
bfh.bfSize=54+size; 4Xn-L&0z
bfh.bfOffBits=54; oVfRp.a
CFile bf; ({C|(v9C7
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ iy_3#x5>
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <<YH4}wZ
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4Xv."L
bf.WriteHuge(lpData,size); |oR{c%z05
bf.Close(); Zjc0R
nCount++; "88<{x L
} \[B#dw#
GlobalFreePtr(lpData); HXqG;Fds(
if(nCount==1) b|@f!lA
m_Number.Format("%d picture captured.",nCount); 6gq`V,
else x:]_z.5
m_Number.Format("%d pictures captured.",nCount); H3ob
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UpdateData(FALSE); j(_6.zf
} 8 }Maj
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5* ~EdT
{ 0{Zwg0&
if(pMsg -> message == WM_KEYDOWN) = o1&.v2j
{ nC9xN
if(pMsg -> wParam == VK_ESCAPE) D r6u0rx8
return TRUE; lOIf4
if(pMsg -> wParam == VK_RETURN) 09Z\F^*$F
return TRUE; vFgnbWxG
} 8)}A}x
return CDialog::PreTranslateMessage(pMsg); 6a{b%e`
} XJ7mvLM;
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) cT'<,#^/
{ P[Id[}5Pw
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @iYr<>iDZ
SaveBmp(); a
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return FALSE; *{e,< DV
} :YmFQ>e?
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9 NC'iFQ#
CMenu pop; EI&)+cC
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l9NET
CMenu*pMenu=pop.GetSubMenu(0); ^JB5-EtL(
pMenu->SetDefaultItem(ID_EXITICON); @ c%h fI
CPoint pt; ~t.i;eu
GetCursorPos(&pt); z"{Ji{>%=
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r5!Sps3B
if(id==ID_EXITICON) w"E.Va
DeleteIcon(); ?)/&tk9.n
else if(id==ID_EXIT) \ 3l3,VYH
OnCancel(); mH4Jl1S&
return FALSE; yd`f<Hr<m
} 'c/Z
W
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {,o =K4CD
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QPz3IK%
AddIcon(); t^<ki?*
return res; Q\Nz^~dQ:Y
} >xm:?W R
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void CCaptureDlg::AddIcon() #)<WQZ)
{ :c&F\Q=
NOTIFYICONDATA data; zCpXF<_C
data.cbSize=sizeof(NOTIFYICONDATA); 53?B.\
CString tip; OjY#xO+'
tip.LoadString(IDS_ICONTIP); /y5a~3
data.hIcon=GetIcon(0); +{{'3=x9
data.hWnd=GetSafeHwnd(); *JY2vq
strcpy(data.szTip,tip); aK'%E3!~=x
data.uCallbackMessage=IDM_SHELL; 8$6^S{M3
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !K_ ke h
data.uID=98; 7|pF(sb0
Shell_NotifyIcon(NIM_ADD,&data); EY.Z.gMZI(
ShowWindow(SW_HIDE); @ u2P&|:{
bTray=TRUE; |(UkI?V
} !XrnD#
fGDjX!3-S
void CCaptureDlg::DeleteIcon() L
t.Vo
{ /AUXO]
NOTIFYICONDATA data; `F' >NNY
data.cbSize=sizeof(NOTIFYICONDATA); !>QD42
data.hWnd=GetSafeHwnd(); X!/
data.uID=98; aQ.mvuMa7'
Shell_NotifyIcon(NIM_DELETE,&data); Qj/.x#T
ShowWindow(SW_SHOW); FTZaN1%`
SetForegroundWindow(); oxgh;v*
ShowWindow(SW_SHOWNORMAL); c *]6>50
bTray=FALSE; sT% ^W
} oi/bp#(fa
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void CCaptureDlg::OnChange() P{h$> 6c
{ W .bJ.hO*
RegisterHotkey(); 5R"(4a P
} HPeN0=7>
81/t)Cp
BOOL CCaptureDlg::RegisterHotkey() %DF-;M"8
{ M}b[;/~
UpdateData(); uMM?s?q
UCHAR mask=0; YA4;gH +
UCHAR key=0; `q(eB=6;[
if(m_bControl) 4?cIn4}
mask|=4; bG[)r
if(m_bAlt) N\WEp?%~
mask|=2; wT+b|K
if(m_bShift) n*GsM6Y&
mask|=1; bpWEF b'f
key=Key_Table[m_Key.GetCurSel()]; BF(.^oh"n0
if(bRegistered){ j5qrM_Chg
DeleteHotkey(GetSafeHwnd(),cKey,cMask); S2EeC&-AR
bRegistered=FALSE; ojQjx|Q}
} >`!Lh`n7_
cMask=mask; (}NKW
cKey=key; BjyGk+A
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1me16 5y<B
return bRegistered; c2fbqM~
} %Ut7%obpi
gls %<A{C
四、小结 '-5Q>d~&h
f-/zR %s{
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。