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:
XSz)$9~hk
T0P_&E@X 一、实现方法
\#)w$O Oi4tG&q 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:
InR/g@n+D1 "E )0)A3= #pragma data_seg("shareddata")
!%%(o%bi~ HHOOK hHook =NULL; //钩子句柄
K-drN)o UINT nHookCount =0; //挂接的程序数目
+OC~y: static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
5\eM3w'd static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
; )J\k2 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
nf9NJ_8}4H static int KeyCount =0;
16R0#Q/{+* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
V'&`JZK6 #pragma data_seg()
ww$Ec ua>YI 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。
eww/tG a H^C$2 f DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
u~q6?*5 jz72~+)T BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
^26}j uQ cKey,UCHAR cMask)
t bEJyA {
H|*Ual BOOL bAdded=FALSE;
rc+}KO for(int index=0;index<MAX_KEY;index++){
-yP_S~\n if(hCallWnd[index]==0){
%T'<vw0 hCallWnd[index]=hWnd;
6E@qZvQ HotKey[index]=cKey;
&a
bR}J[ HotKeyMask[index]=cMask;
}IGoPCV| bAdded=TRUE;
j$Z:S~* KeyCount++;
<mX EX`? break;
xl4 A< }
Pmj%QhOYE }
+1=]93gP return bAdded;
-{rUE + }
D>efr8Qd@ //删除热键
s'JbG&T[J BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
yRv4,{B}X> {
G2BB]] m3 BOOL bRemoved=FALSE;
Kk9W=vd for(int index=0;index<MAX_KEY;index++){
p?XVO# if(hCallWnd[index]==hWnd){
$|%BaEyk if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r>ca17 hCallWnd[index]=NULL;
-oR P ZtW HotKey[index]=0;
R /0zB HotKeyMask[index]=0;
?,0 a#lG bRemoved=TRUE;
*$yU|, KeyCount--;
4RoE>m1[G break;
g,]GzHV1 }
Ek%mX" }
XlDN)b5v{ }
GP{$w_'!J0 return bRemoved;
{ZIEIXWb2 }
RJk4 2;] nBJ'ak Uon^z?0A DLL中的钩子函数如下:
?0J&U4 c$#7Kp4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
-#<AbT {
Cu&y',ee~ BOOL bProcessed=FALSE;
zVyMmw\ if(HC_ACTION==nCode)
-"~XI~a@Wo {
{7Q)2NC if((lParam&0xc0000000)==0xc0000000){// 有键松开
b:t|9FE% switch(wParam)
j;SK{Oq {
,A9_xdv5 case VK_MENU:
'
>R?8Y MaskBits&=~ALTBIT;
x,: DL)$1 break;
$~5ax8u&!# case VK_CONTROL:
Dlqvz|X/ MaskBits&=~CTRLBIT;
"cD MFu break;
5e}adHjM case VK_SHIFT:
q)PLc{NO MaskBits&=~SHIFTBIT;
&Xh_`*]ox break;
>7,?X_:A-1 default: //judge the key and send message
_`.Wib+ break;
Ev>P|kV&A }
@
q:S]YB for(int index=0;index<MAX_KEY;index++){
&5d~ODO if(hCallWnd[index]==NULL)
;(r,;S_`0 continue;
5u=>~yK+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X([p0W
9V( {
:`>bh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
{j[a'Gb bProcessed=TRUE;
JBk >|q" }
^aR^M\38 }
[]b=
xRJM }
SQs+4YJ else if((lParam&0xc000ffff)==1){ //有键按下
n4InZ!) switch(wParam)
p!>DA?vF {
/^hc8X case VK_MENU:
t0.71( MaskBits|=ALTBIT;
_Nacqa break;
Lq2ZgKd! case VK_CONTROL:
>0E3Em<(}l MaskBits|=CTRLBIT;
_|VF^\i break;
s
a{x.2/o} case VK_SHIFT:
<N{Y*,^z MaskBits|=SHIFTBIT;
}?^]-`b break;
d}Xb8SaE%c default: //judge the key and send message
lsA?|4`mn break;
%sCG}?
y }
sWv!ig_ for(int index=0;index<MAX_KEY;index++){
keb.%cb= if(hCallWnd[index]==NULL)
9 iV_ continue;
t$z 5m<8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pS+hE4D {
Te2C<c SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(tvfF0~ bProcessed=TRUE;
(lg~}Jwq }
~@mNR^W-W }
1+9!W }
]FEDAGu if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
}'`}| pM$ for(int index=0;index<MAX_KEY;index++){
3/V0w|ZgD if(hCallWnd[index]==NULL)
|.;*,bb|3 continue;
t?wVh0gT if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T~8kKw SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
s"5wnp6pW //lParam的意义可看MSDN中WM_KEYDOWN部分
Y1G/1Z# 2 }
(f;.`W }
p^k*[3$0 }
Zu/w[*;M return CallNextHookEx( hHook, nCode, wParam, lParam );
L$6W,D }
B$ jX%e{:S ^h!}jvqE 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:
4Z.Dz@.c( |[!7^tU* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
V3(8?Fz. BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Ug )eyu q.VZ P 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:
gH
yJ~ [ji')PCAi; LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
kMZo7 y {
I%l2_hs0V if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
x>tsI}C {
@%jY //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
c 5 `74g SaveBmp();
t:"%d9]
return FALSE;
;)FmN[ }
tyFsnck …… //其它处理及默认处理
4%#q.qI }
c#-*]6x fJ=v? QXW>}GdKZ 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。
qOv`&%txW >XxHp 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。
@r=,:
'Mt '<$*N 二、编程步骤
:7~DiH:Q
1zgM$p 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";
;3XOk+ 6)c-s|# 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
re4A5Ev$ p'A43 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;
wLzV#8> 86);0EBX 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;
|
{Q}:_/q 0?cJ>)N 5、 添加代码,编译运行程序。
$,B;\PX q07H{{h/B 三、程序代码
a"l\_D'.K8 yKy
)%i ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
k"|Fu #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
7AlL,&+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
qh+&Z x~ #if _MSC_VER > 1000
EQ.K+d*K][ #pragma once
P *&Cght>0 #endif // _MSC_VER > 1000
l6zYiM #ifndef __AFXWIN_H__
1Tr%lO5?6 #error include 'stdafx.h' before including this file for PCH
=RAojoN #endif
^B1$|C
D, #include "resource.h" // main symbols
](FFvqA class CHookApp : public CWinApp
@,9YF}
{
Z/T(4 public:
tSe[*V4{' CHookApp();
XRHngW_A // Overrides
vR&b2G7o // ClassWizard generated virtual function overrides
:| !5d{8S8 //{{AFX_VIRTUAL(CHookApp)
Sp2DpGs~ public:
3 .K #, virtual BOOL InitInstance();
B#?rW*yEe virtual int ExitInstance();
'S|7<<>4k //}}AFX_VIRTUAL
+,cd$,18 //{{AFX_MSG(CHookApp)
ra2{8 x // NOTE - the ClassWizard will add and remove member functions here.
wbvOf X // DO NOT EDIT what you see in these blocks of generated code !
U9K'O !i> //}}AFX_MSG
G;d3.ml/aZ DECLARE_MESSAGE_MAP()
m>RtKCtP };
`X)A$lLr LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
[b_qC'K[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
1 e]D=2y BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Z;,G:@, BOOL InitHotkey();
0
vYG#S BOOL UnInit();
\C>+ubF #endif
Zl{9G?abCT t fD7!N{ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
v^)B[e! #include "stdafx.h"
UB+7]S #include "hook.h"
4oL .Bt #include <windowsx.h>
e)N<r #ifdef _DEBUG
+z:>Nl #define new DEBUG_NEW
/4N ?v. jf #undef THIS_FILE
hiEYIx static char THIS_FILE[] = __FILE__;
mkhWbzD'S #endif
_8!x #define MAX_KEY 100
!8D>Bczq) #define CTRLBIT 0x04
7&9w_iCkV #define ALTBIT 0x02
CO9PQ`9+ #define SHIFTBIT 0x01
R1/c@HQw? #pragma data_seg("shareddata")
=XK}eQ_d HHOOK hHook =NULL;
|KY-kRN7 UINT nHookCount =0;
<LzxnTx= static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
!zvOCAb, static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
K|l}+:k static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
*[m:4\ static int KeyCount =0;
_]- 4UA- static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
I9Uj3cL\ #pragma data_seg()
G&@dJ &B HINSTANCE hins;
BzS\p3& void VerifyWindow();
O=*, BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
.YWkFTlZ+ //{{AFX_MSG_MAP(CHookApp)
!v(^wqna\ // NOTE - the ClassWizard will add and remove mapping macros here.
v~yw-}fk% // DO NOT EDIT what you see in these blocks of generated code!
H%etYpD //}}AFX_MSG_MAP
_aBy>=2c$ END_MESSAGE_MAP()
~Uey'Xz wlsx| CHookApp::CHookApp()
;^u,[d {
3%Eu$|B // TODO: add construction code here,
H
XFY // Place all significant initialization in InitInstance
z&B9Yu4M7 }
];"40 /X ecQ{ePoU CHookApp theApp;
r
d-yqdJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
R\XS5HOE( {
p2k`)=iX BOOL bProcessed=FALSE;
"}#%h&, if(HC_ACTION==nCode)
;]b4O4C\ {
DA04llX~ if((lParam&0xc0000000)==0xc0000000){// Key up
d7mn(= & switch(wParam)
}2;iIw` {
<:NahxIlu case VK_MENU:
B- $?5Ft! MaskBits&=~ALTBIT;
vm{8x o break;
+2}cR66% case VK_CONTROL:
[ZC\8tP`V MaskBits&=~CTRLBIT;
%P M#gnt@ break;
9#m3<oSJ case VK_SHIFT:
#/jug[wf*! MaskBits&=~SHIFTBIT;
Xdo\DQn break;
4(VV@:_% default: //judge the key and send message
ExSM=
break;
F\^8k /0 }
~\i(bFd) for(int index=0;index<MAX_KEY;index++){
dvqg H if(hCallWnd[index]==NULL)
l2:-).7xt continue;
y.}{KQ"a* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,msP(*qoI {
1G"ohosmF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
'RhS%l bProcessed=TRUE;
Jwfb%Xge~ }
x;$ESPPg }
M:/(~X{? }
JqZt1um else if((lParam&0xc000ffff)==1){ //Key down
CLk,]kA'r switch(wParam)
\Vroz=IT: {
E?czolNl case VK_MENU:
Dr:M~r'6 MaskBits|=ALTBIT;
-CuuO=h break;
8)=(eI$ case VK_CONTROL:
F[SZwMf29 MaskBits|=CTRLBIT;
xr]bH.> break;
E:dN) case VK_SHIFT:
6i~|<vcSP MaskBits|=SHIFTBIT;
/9&!u )+ break;
l@*$C&E default: //judge the key and send message
/}
z9( break;
s]OZ+^Z }
rks"y&&Nc for(int index=0;index<MAX_KEY;index++)
oA@M = {
y<w_>O if(hCallWnd[index]==NULL)
%8|lAMTY7/ continue;
8a`3eM~?[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4H%#Sn#L^! {
t!SxJB e SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
WeaT42*Q{ bProcessed=TRUE;
ygj%VG }
U~)5 { }
@&`^#pok }
Xwdcy J! if(!bProcessed){
i&^JG/a for(int index=0;index<MAX_KEY;index++){
0kj5r*qA if(hCallWnd[index]==NULL)
ybqmPT'|_ continue;
)W>$_QxbN if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=0]K(p, SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
egSs=\ }
L.yM" }
j5" L }
y0(.6HI return CallNextHookEx( hHook, nCode, wParam, lParam );
G4*&9Wo }
^)Awjj9 Yl>Y.SO BOOL InitHotkey()
_u^3uzu {
m"/..&'GC if(hHook!=NULL){
vA!IcDP" nHookCount++;
D
(8Z90 return TRUE;
4'*-[TKC }
3<+ZA-2 else
*]NfT}} hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
"_\"S if(hHook!=NULL)
fdX|t"oz nHookCount++;
][tR=Y#&y5 return (hHook!=NULL);
b@8z+,_ }
]xMZo){[| BOOL UnInit()
z9 Ch %A{ {
^h2+"" if(nHookCount>1){
3^%2, nHookCount--;
2wB*c9~ return TRUE;
%L-qAI&V }
p7-\a1P3 BOOL unhooked = UnhookWindowsHookEx(hHook);
FXDB> }8 if(unhooked==TRUE){
Qs
za,09 nHookCount=0;
Y:O|6%00Y hHook=NULL;
&
[@)Er= }
%LP4RZ return unhooked;
#}B1W&\sw }
qpjZ-[UC Um\HX6 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MnqT?Cc4$j {
_q#pEv BOOL bAdded=FALSE;
``k[CgV for(int index=0;index<MAX_KEY;index++){
)Jk$j if(hCallWnd[index]==0){
"5<! hCallWnd[index]=hWnd;
F"k`PF*b HotKey[index]=cKey;
B>:U HotKeyMask[index]=cMask;
aReJ@ bAdded=TRUE;
2^
]^Yc KeyCount++;
CN ( : break;
0Zwx3[bq6K }
xtD(tiqh.; }
T=u"y;&L return bAdded;
p *42
@1, }
,(Zxd4?y ; 8DtnnE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BRM `/s {
{g1"{ BOOL bRemoved=FALSE;
VFZ?<m for(int index=0;index<MAX_KEY;index++){
,M?8s2? if(hCallWnd[index]==hWnd){
u8KQV7E if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Dt[+HCCY: hCallWnd[index]=NULL;
LH_H
yP_ HotKey[index]=0;
|[iO./zP HotKeyMask[index]=0;
3%(r,AD bRemoved=TRUE;
Be@g|'r KeyCount--;
R|(X_A break;
NYP3u_
QX }
~Yg)8 }
\9OKf|#j }
\RR`
F .7 return bRemoved;
BWxJ1ENM
}
"1^tVw| $Ugc:L<h+ void VerifyWindow()
Xwo+iZ(a {
qOy(dG g for(int i=0;i<MAX_KEY;i++){
Y%
\3 N if(hCallWnd
!=NULL){
0LL65[
if(!IsWindow(hCallWnd)){ x3FB`3y~s
hCallWnd=NULL; 0]*W0#{Zj
HotKey=0; pXl qE,
HotKeyMask=0; <";1[A%7<
KeyCount--; TO5y.M|7
} ibZ[U p?
} \8<[P(!3
} Gr&e]M[ l
} N".BC|r
UW8yu.`?
BOOL CHookApp::InitInstance() 7Ko*`-p
{ P.q7rk<
AFX_MANAGE_STATE(AfxGetStaticModuleState()); dtY8>klI
hins=AfxGetInstanceHandle();
`ql8y '
InitHotkey(); ]5QXiF8`
return CWinApp::InitInstance(); AEnkx!o
} KG(FA
wT- -i@@
int CHookApp::ExitInstance() 0_ST2I"Ln
{ \.i ejB
VerifyWindow(); qS! Lt3+
UnInit(); ~=c5q
return CWinApp::ExitInstance(); -f ~1Id
} zE1=P/N
QnBWZUI
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xg,
9~f[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ob/<;SrU<
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @.a59kP8X
#if _MSC_VER > 1000 r vq{Dfo=
#pragma once n_]B5U
#endif // _MSC_VER > 1000 PPV T2;9
*2-b&PQR{
class CCaptureDlg : public CDialog {ixKc
{ _u6NaB
// Construction Q%q;=a
public: hG~.Sc:G
BOOL bTray; (-0d@eqw
BOOL bRegistered; :}fA98S
BOOL RegisterHotkey(); (D?4*9=
UCHAR cKey; VByA6^JR
UCHAR cMask; ;Dp*.YJ
void DeleteIcon(); CfS;F
void AddIcon(); ewn\'RLZ"@
UINT nCount; vv2[t
void SaveBmp(); _8y4U[L
CCaptureDlg(CWnd* pParent = NULL); // standard constructor E A55!
// Dialog Data 0[d*Z
//{{AFX_DATA(CCaptureDlg) AU)\ lyB
enum { IDD = IDD_CAPTURE_DIALOG }; XY6Sm{
CComboBox m_Key; ^CQp5k p]
BOOL m_bControl; `5oXf
BOOL m_bAlt; 2i#Ekon
BOOL m_bShift; ?o6#i 3k#'
CString m_Path; eB9&HD:
CString m_Number; zBq&/?
//}}AFX_DATA A7#nBHwxZ
// ClassWizard generated virtual function overrides Y=Ic<WHR
//{{AFX_VIRTUAL(CCaptureDlg) ^fO9oPM|
public: KwaxNb5
virtual BOOL PreTranslateMessage(MSG* pMsg); ztHx)
!
protected: }BT0dKx
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0/|Ax-dK
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sl@>GbnS
//}}AFX_VIRTUAL 4HZXv\$
// Implementation 2#yDVN$
protected: VuTTWBx
HICON m_hIcon; pN9U1!|uam
// Generated message map functions LcA7f'GVK
//{{AFX_MSG(CCaptureDlg)
<6;@@
virtual BOOL OnInitDialog(); >0iCQKq
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #b)`as?!1
afx_msg void OnPaint(); |N6.:K[`
afx_msg HCURSOR OnQueryDragIcon(); K%
snE7X?)
virtual void OnCancel(); \Ezcr=0z{j
afx_msg void OnAbout(); 3rHn?
afx_msg void OnBrowse(); ' e!WZvr
afx_msg void OnChange(); M6A0D+08
//}}AFX_MSG
tmBt[
DECLARE_MESSAGE_MAP() kd"nBb=
}; F/LMk8RgR
#endif G `3{Q7k
{0a\<l
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Vh=U/{Rp1
#include "stdafx.h" Ylu\]pr9|C
#include "Capture.h" 8BZ&-j{
#include "CaptureDlg.h" xj8z*fC;
#include <windowsx.h> qgfP6W$
#pragma comment(lib,"hook.lib") !fe_w5S^
#ifdef _DEBUG @^ &p$:
#define new DEBUG_NEW aY.cx1"
#undef THIS_FILE w8$>
2
static char THIS_FILE[] = __FILE__; `bV&n!Y_
#endif p{ZyC
#define IDM_SHELL WM_USER+1 @T L|\T
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {fV$\^c
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `jOk6;Z[
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \JR^uJ{Y
class CAboutDlg : public CDialog 4:**d[|1
{ +hispU3ia
public: OXKV6r6f
CAboutDlg(); d)Z&_v<|
// Dialog Data o+XQMg
//{{AFX_DATA(CAboutDlg) +rSU
enum { IDD = IDD_ABOUTBOX }; CSW+UaE
//}}AFX_DATA Gl|n }wo$
// ClassWizard generated virtual function overrides B6Ajcfy
//{{AFX_VIRTUAL(CAboutDlg) \k"Ct zoX
protected: q o^mp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~UeTV?)
//}}AFX_VIRTUAL XHJ`C\xR
// Implementation YIgHLM(
protected: R)SY#*Y
//{{AFX_MSG(CAboutDlg) <z#Fj`2{
//}}AFX_MSG -L6CEe
DECLARE_MESSAGE_MAP() T2rBH]5
}; iV#A-9
[\h?mlG?
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `[}X_d 1A
{ ?GhMGpdMq
//{{AFX_DATA_INIT(CAboutDlg) #XqCz>Z
//}}AFX_DATA_INIT UA~ 4O Q]
} aMHC+R1X
%-K5sIz
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +zLw%WD[l
{ lEHXh2
CDialog::DoDataExchange(pDX); ;&}z
L.!jo
//{{AFX_DATA_MAP(CAboutDlg) (jyufHm
//}}AFX_DATA_MAP f9kdO&
} uHmvHA~/c8
&!WRa@x0I
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -K8F$\W
//{{AFX_MSG_MAP(CAboutDlg) !||Gfia
// No message handlers b.?;I7r
//}}AFX_MSG_MAP {m{nCl)y
END_MESSAGE_MAP() {dRZ2U3
#OjyUQ,
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) mPQT%%MF
: CDialog(CCaptureDlg::IDD, pParent) wWf_d jd
{ tk h
*su
//{{AFX_DATA_INIT(CCaptureDlg) q I~*G3
m_bControl = FALSE; yoF*yUls^E
m_bAlt = FALSE; gdqBT]j
m_bShift = FALSE; ]yqE6Lf9
m_Path = _T("c:\\"); BaIuOZ@,
m_Number = _T("0 picture captured."); s]kzXzRC?
nCount=0; c[ 0`8s!
bRegistered=FALSE; +U_1B%e(%
bTray=FALSE; 8>x'. 8
//}}AFX_DATA_INIT L1g0Dd\Ox
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 bE2O[B
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R'>@ja*
} \SO)|M>. a
Lr8|S
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ZS]Z0iZv9
{ a:HN#P)12
CDialog::DoDataExchange(pDX); mDbTOtD
//{{AFX_DATA_MAP(CCaptureDlg) z9OpxW@Ou
DDX_Control(pDX, IDC_KEY, m_Key); Z^4+ 88
DDX_Check(pDX, IDC_CONTROL, m_bControl); +O9x8OPHW
DDX_Check(pDX, IDC_ALT, m_bAlt); ZbdGI@
DDX_Check(pDX, IDC_SHIFT, m_bShift); >D~8iuy]8.
DDX_Text(pDX, IDC_PATH, m_Path); |%F4`gz8KP
DDX_Text(pDX, IDC_NUMBER, m_Number); 7D:rq 8$\
//}}AFX_DATA_MAP C^B$_?
} +0Q +0:
ly6zz|c5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <BZC5b6
//{{AFX_MSG_MAP(CCaptureDlg) kMnG1K
ON_WM_SYSCOMMAND() LJ@r+|>
ON_WM_PAINT() GU@#\3
ON_WM_QUERYDRAGICON() cRbA+0m>
ON_BN_CLICKED(ID_ABOUT, OnAbout) 39P55B/o%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) E7@Gpu,o
ON_BN_CLICKED(ID_CHANGE, OnChange) ~UO}PI`C
//}}AFX_MSG_MAP :@-yK8q's
END_MESSAGE_MAP() :p]e4|R
uG6.(A1LM
BOOL CCaptureDlg::OnInitDialog() +5Dc5Bl
{ Y0EX{oxt1
CDialog::OnInitDialog(); aL+>XN
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5 *YvgB;
ASSERT(IDM_ABOUTBOX < 0xF000); EleJ$ `/
CMenu* pSysMenu = GetSystemMenu(FALSE); <Y1Plc
if (pSysMenu != NULL) GtZ.'?-
{ cYC^;,C &|
CString strAboutMenu; } -;)G~h/"
strAboutMenu.LoadString(IDS_ABOUTBOX); 4Nt4(3Kf
if (!strAboutMenu.IsEmpty()) es#6/
{ 7'i{JPm
pSysMenu->AppendMenu(MF_SEPARATOR); z,SI
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5n}<V-yJ*m
} {y6h(@I8\
} 4\v &8">LL
SetIcon(m_hIcon, TRUE); // Set big icon to&,d`k=-
SetIcon(m_hIcon, FALSE); // Set small icon {!qnHv\S
m_Key.SetCurSel(0); ~;Y Tz
RegisterHotkey(); X_@|+d
CMenu* pMenu=GetSystemMenu(FALSE); $HQ4 o\~
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ny/eYF#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v3M$UiN,:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .43cI(
return TRUE; // return TRUE unless you set the focus to a control Gbclu.4
} .o/uA
HZWt>f
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D^.
c:
{ a*.#Zgy:lK
if ((nID & 0xFFF0) == IDM_ABOUTBOX) `\\s%}vZ*T
{ $^{#hYq)o
CAboutDlg dlgAbout; {R@V
dlgAbout.DoModal(); Lkx~>U
} )&>W/56/
else ~v pIy -
{ (Ll'j0]k>
CDialog::OnSysCommand(nID, lParam); @,k5T51m
} b$#b+G{y
} we^'R}d
5BXku=M
void CCaptureDlg::OnPaint() t ;h`nH[
{ z5M6
if (IsIconic()) {en'8kS
{ HSROgBNI:
CPaintDC dc(this); // device context for painting HNBmq>XDc
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &b5(Su
// Center icon in client rectangle 0^o/cSF
int cxIcon = GetSystemMetrics(SM_CXICON); jED.0,+K!
int cyIcon = GetSystemMetrics(SM_CYICON); ;e5PoLc
CRect rect; T~Bj],k_
GetClientRect(&rect); u4SL:IH{D
int x = (rect.Width() - cxIcon + 1) / 2; EUcD[Rv
int y = (rect.Height() - cyIcon + 1) / 2; BPt? 3tC
// Draw the icon 1Pw1TO"Z
dc.DrawIcon(x, y, m_hIcon); VlA]A,P}i
} ;zD4#7=
else }a~hd*-#
{ 'gs P9
CDialog::OnPaint(); SKnYeT
} JRFUNy1+e1
} ws!~MSIy
+8N6tw/&
HCURSOR CCaptureDlg::OnQueryDragIcon() !^su=c
{ =VuSi(d;e{
return (HCURSOR) m_hIcon; p5or"tK
} M;ADL|
~:T@SrVI
void CCaptureDlg::OnCancel() 2m yxwA5
{ b=:u d[h
if(bTray) 04;s@\yX4
DeleteIcon(); X]@"ZV[
CDialog::OnCancel(); *4`5&) `
} k"&o)*d
I]e+5 E0
void CCaptureDlg::OnAbout() ;]=w6'dP!
{ [F+W]Jk,
CAboutDlg dlg; Zc1x"j
dlg.DoModal(); ~d]v{<3
} ?=&S?p)-<
X=]utn
void CCaptureDlg::OnBrowse() ~r8<|$;
{ 0@cIj
]
CString str; pIcg+~
BROWSEINFO bi; qNj?Rwc
char name[MAX_PATH]; HBE[q#
ZeroMemory(&bi,sizeof(BROWSEINFO)); bT2G
G
bi.hwndOwner=GetSafeHwnd(); \N0vA~N.
bi.pszDisplayName=name; t
sUu
bi.lpszTitle="Select folder"; z6E =%-`
bi.ulFlags=BIF_RETURNONLYFSDIRS; A3_p*n@
LPITEMIDLIST idl=SHBrowseForFolder(&bi); eP>_CrJb
if(idl==NULL) EA6l11{Gk1
return; =+j3E<w
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ;HXk'xN
str.ReleaseBuffer(); (=7"zECq#
m_Path=str; {j>a_]dTVX
if(str.GetAt(str.GetLength()-1)!='\\') BM /FOY;
m_Path+="\\"; 8Zsaq1S
UpdateData(FALSE); iVZ}+Ct<"
} xE?KJ
zs#-E_^%M
void CCaptureDlg::SaveBmp() e3;D1@
{ \Yr*x7!
CDC dc; d%'#-w'
dc.CreateDC("DISPLAY",NULL,NULL,NULL); B0Wf$
s^7t
CBitmap bm; )f:i4.M
int Width=GetSystemMetrics(SM_CXSCREEN); 2\1+M)
int Height=GetSystemMetrics(SM_CYSCREEN); '|ntwK*f
bm.CreateCompatibleBitmap(&dc,Width,Height); nahq O|~
CDC tdc; AtCT
tdc.CreateCompatibleDC(&dc); `3T=z{HR9g
CBitmap*pOld=tdc.SelectObject(&bm); *GE6zGdN
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }UW*[dCf>C
tdc.SelectObject(pOld); 3i!a\N4 K
BITMAP btm; Gr2}N"X=
bm.GetBitmap(&btm); %BkE %ZcZ
DWORD size=btm.bmWidthBytes*btm.bmHeight; N
{
oVz],
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); F:ycV~bE
BITMAPINFOHEADER bih; a4^hC[a
bih.biBitCount=btm.bmBitsPixel; ^ul1{
bih.biClrImportant=0; 9#:nlu9
bih.biClrUsed=0; K.}jOm
bih.biCompression=0; S#C-j D
bih.biHeight=btm.bmHeight; mgx|5Otg
bih.biPlanes=1; ~+4lmslR
bih.biSize=sizeof(BITMAPINFOHEADER); *Sj)9mp
bih.biSizeImage=size; u$%C`v>
bih.biWidth=btm.bmWidth; :;eOhZ=_
bih.biXPelsPerMeter=0; 9S]pC?N]E
bih.biYPelsPerMeter=0; U U_0@V<
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /=6_2t#vA
static int filecount=0; qco'neR"z
CString name; # atq7tX
name.Format("pict%04d.bmp",filecount++); Ly2,*\7
name=m_Path+name; Y0,{fw<
BITMAPFILEHEADER bfh; 1sj7]G]`k
bfh.bfReserved1=bfh.bfReserved2=0; *b) (-#w3
bfh.bfType=((WORD)('M'<< 8)|'B'); l.pxDMY
bfh.bfSize=54+size; ~wW]ntZm
bfh.bfOffBits=54; 2Cp4aTGv#
CFile bf; 3pWav
1"
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8m
iJQIq
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^;PjO|mD
Z
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f<bB= 9J
bf.WriteHuge(lpData,size); cwzkA,e@
bf.Close(); n>.@@
nCount++; h8UhrD<:
} u/j\pDl.
GlobalFreePtr(lpData); ]}g\te
if(nCount==1) +j<WP
m_Number.Format("%d picture captured.",nCount); PxrT@.T$
else .Bl:hk\
m_Number.Format("%d pictures captured.",nCount); *x2!N$b
UpdateData(FALSE); fs#9~b3
} :.g/=Q(T~
8` +=~S
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |=IJ^y(x|
{ y+iRZ%V^
if(pMsg -> message == WM_KEYDOWN) 75Z|meG~
{ AJi+JO-
if(pMsg -> wParam == VK_ESCAPE) wGLMLbj5
return TRUE; 3'.3RKV
if(pMsg -> wParam == VK_RETURN) =_k
return TRUE; 6Z#Nh@!+C
} 30^q_|l:]
return CDialog::PreTranslateMessage(pMsg); O.Pp*sQ^
} ++,I`x+p
*]yrN`
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?+hEs =Xs
{ |k6+-
1~_
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N/0aO^"V
SaveBmp(); J8Wits]A]$
return FALSE; QY)p![6Fj
} SV t~pE+Y
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3#,6(k4>
CMenu pop; dM^EYW
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Cty{
CMenu*pMenu=pop.GetSubMenu(0); *Ze0V9$'
pMenu->SetDefaultItem(ID_EXITICON); )KFxtM-
CPoint pt; [&99#7B
GetCursorPos(&pt); x@43ZH_
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y$7Ys:R~
if(id==ID_EXITICON) %_s)Gw&sq
DeleteIcon(); <MG&3L.[
else if(id==ID_EXIT) kNWTM%u9
OnCancel(); -hnNaA
return FALSE; G)s.~ T
} ri4z^1\
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "|(.W3f1
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) m@kLZimD
AddIcon(); 6inAnC@I
return res; >C_G~R
} 3mU~G}ig
hev;M)t
void CCaptureDlg::AddIcon() Zm*d)</>
{ CJN~p]\
NOTIFYICONDATA data; bh5D}w
data.cbSize=sizeof(NOTIFYICONDATA); =|AYT6z,
CString tip; }d}sC\>U
tip.LoadString(IDS_ICONTIP); 9oc_*V0<
data.hIcon=GetIcon(0); L3\#ufytb
data.hWnd=GetSafeHwnd(); Vc5>I_
strcpy(data.szTip,tip); ^*f D
data.uCallbackMessage=IDM_SHELL; }d;2[fR)
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \ejHM}w3,
data.uID=98; tm5{h{AM
Shell_NotifyIcon(NIM_ADD,&data); rVP\F{Q4Tr
ShowWindow(SW_HIDE); '9u?lA^9$
bTray=TRUE; jA9uB.I,"b
} AcuZ?LYzK
,(q]
$eOZ
void CCaptureDlg::DeleteIcon() grE(8M
{ 0#TL$?=|
NOTIFYICONDATA data; sTP\}
data.cbSize=sizeof(NOTIFYICONDATA); L~/,;PHN
data.hWnd=GetSafeHwnd(); f$:Y'$Z1
data.uID=98; 5B)&;[
Shell_NotifyIcon(NIM_DELETE,&data); k F^4kCJ@
ShowWindow(SW_SHOW); 4Lg
,J9
SetForegroundWindow(); sDNWB_~
ShowWindow(SW_SHOWNORMAL); \;MP|:{pU
bTray=FALSE; r}qDvC D
} py\:u5QS
Qqg.z-G%.
void CCaptureDlg::OnChange() g|uyQhsg
{
!D['}%
RegisterHotkey(); #%QHb,lhl
} G?@W;o)
\k=dqWBr7
BOOL CCaptureDlg::RegisterHotkey() W2rd[W
{ nxhlTf>3
UpdateData(); :y7K3:d3
UCHAR mask=0; P9
HKev?y
UCHAR key=0; M7?ktK9`ma
if(m_bControl) {E%c%zzQ
mask|=4; h=`$ec
if(m_bAlt) kP$E+L
mask|=2; ',g%L_8Sq
if(m_bShift) o3+s.7 "
mask|=1; rP]|`*B
key=Key_Table[m_Key.GetCurSel()]; ZMlBd}H
if(bRegistered){ OR6vA5J
DeleteHotkey(GetSafeHwnd(),cKey,cMask); :z P:4NW
bRegistered=FALSE; ^BLO}9A{P
} 1_S]t[?I/
cMask=mask; nZnqXclzxn
cKey=key; TO89;O
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); V~*>/2+
return bRegistered; (U#,;
} G@Z%[YNw
.n8O 3V
四、小结 I1m[M?
@P~%4:!Hr
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。