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:
;]SP~kG
pJ]i)$M 一、实现方法
u\|Ys 0"$'1g^]7 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:
/<oBgFMoJ G7H'OB
& #pragma data_seg("shareddata")
rfxLCiV HHOOK hHook =NULL; //钩子句柄
!Ql&Ls UINT nHookCount =0; //挂接的程序数目
)F4P-u static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
6B>H75S+H static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
/h73'"SpDy static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Iw) 'Yyg static int KeyCount =0;
qluaop static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
HCKj8-* #pragma data_seg()
Oe}6jcb6& bn<} 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。
{V~Gr 5R7DD 5c[ 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:
_ ?Z :m !RwOUCk
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
o9uir"= cKey,UCHAR cMask)
(.B+U'6 {
Ndr4e?Xa, BOOL bAdded=FALSE;
{H%1sI for(int index=0;index<MAX_KEY;index++){
;]Bkw6o if(hCallWnd[index]==0){
Kzgnhgc hCallWnd[index]=hWnd;
Smlf9h& HotKey[index]=cKey;
}F4
HotKeyMask[index]=cMask;
*^P$^lm?S bAdded=TRUE;
t.WWahNyY KeyCount++;
t@\op}Z-M break;
6H}8^'/u }
Qape DU; }
G[5z3 return bAdded;
F%>`?NG+c }
4I^8f||b_ //删除热键
I<ta2<h BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sj0{;>>%+N {
ygquQhf5 BOOL bRemoved=FALSE;
h*\/{$y for(int index=0;index<MAX_KEY;index++){
:IlJQ{=W if(hCallWnd[index]==hWnd){
'VTLp.~G~ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
rfS kQT hCallWnd[index]=NULL;
&%4*~;o HotKey[index]=0;
*(sFr E HotKeyMask[index]=0;
_l;$<]re\k bRemoved=TRUE;
1 ojy_ KeyCount--;
g}=opw6z break;
<rpXhcR }
\zPcnDB }
/{d5$(Y" }
==pGRauq return bRemoved;
1#<KZN =$ }
OJF41Z S
2SJFp Zl+Ba DLL中的钩子函数如下:
{Jj
vF h^$c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|SF5'\d' {
]DO"2r BOOL bProcessed=FALSE;
sAz]8(Fi0 if(HC_ACTION==nCode)
]#VNZ#(" {
" ~&d=f0m if((lParam&0xc0000000)==0xc0000000){// 有键松开
5b^`M switch(wParam)
mlD 1 o {
9xm' 0 ' case VK_MENU:
<c&6M MaskBits&=~ALTBIT;
/
!*+9+h break;
ir ^XZVR case VK_CONTROL:
wNgS0{}&` MaskBits&=~CTRLBIT;
*N#{~ break;
;K9rE3
case VK_SHIFT:
oH|<(8efD MaskBits&=~SHIFTBIT;
zn@yt%PCV break;
+(|6Wv default: //judge the key and send message
JxM[LvVi break;
E}WO?xxv74 }
$m-rn'Q for(int index=0;index<MAX_KEY;index++){
h!L6NS_Q, if(hCallWnd[index]==NULL)
n@Ar%%\ continue;
3r(i=ac0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H_CX5=Nq^ {
,[{)4J$MV SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
u`2[V4=L bProcessed=TRUE;
06#40- }
$h( B2 }
"2'pS<| }
1k8zAtuj else if((lParam&0xc000ffff)==1){ //有键按下
6X@$xe847[ switch(wParam)
dNL<O {
<)
`?s case VK_MENU:
Y([YDn MaskBits|=ALTBIT;
.oNs8._:
break;
d]*a:>58 case VK_CONTROL:
h NCoX*icd MaskBits|=CTRLBIT;
A#6\5u break;
\Y{^Q7!>:8 case VK_SHIFT:
f2"1^M MaskBits|=SHIFTBIT;
?$#,h30 break;
(7qdrAeP default: //judge the key and send message
?{
0MF break;
{yPiBu }
hvS4"%\ for(int index=0;index<MAX_KEY;index++){
f2y:K6$'l* if(hCallWnd[index]==NULL)
xC,;IS k, continue;
U<*8KiI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0ThX1)SH {
?{O >&<~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
EhOy<f[4W bProcessed=TRUE;
sX~
`Vn& }
m%bw$hr }
:sY pZX1 }
XJ`!d\WL/! if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
x(Us
O} for(int index=0;index<MAX_KEY;index++){
0Lo)Ni^" if(hCallWnd[index]==NULL)
5k^UZw continue;
rIt#ps if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
8JU9Qb]L'I SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?<iinx //lParam的意义可看MSDN中WM_KEYDOWN部分
0;kp`hB }
n^Uu6 }
-$[o:dLO }
Nn_n@K return CallNextHookEx( hHook, nCode, wParam, lParam );
4{s3S2f= }
s]"NqwIPK -Pr1r 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:
MyyNYZ X. =% BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Ae0jfTv BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{iI"Lt b5MCOW1+ 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:
x dT1jI >2[\WF*"X LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1$*ZN4 {
"0(H! }D if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Vu/{Hr {
C#r1zr6 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Y|NANjEAfm SaveBmp();
s
9Y'MQo* return FALSE;
/2!Wy6p }
5VU
5kiCt …… //其它处理及默认处理
8pQx6QE }
\C
)S3!h ?4kM5NtP t@`w}o[# 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
_i=431Z40 7$l! f 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。
._uXK[c7P "lFS{7 二、编程步骤
^11y8[[ 6i6m*=h 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";
9Dq^x&z( u]W$'MyY 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]>33sb
S6 JfJLJ(} 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
I,*zZNvRi atW=xn 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
UkE fuH TJHab;7F 5、 添加代码,编译运行程序。
sUc_) UC!?. 三、程序代码
<]~FX25 [f^:V:){ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
g9A8b(>F&@ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
6`tc]a"#Zb #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
R d?8LLz #if _MSC_VER > 1000
, :I:F #pragma once
zPonG
d1 #endif // _MSC_VER > 1000
LRJY63A #ifndef __AFXWIN_H__
"G^Z>Z-` #error include 'stdafx.h' before including this file for PCH
E^)>9f7 #endif
JH4hy9i #include "resource.h" // main symbols
m~[4eH, class CHookApp : public CWinApp
i;u#<y{E {
*Vbf;=Mb public:
VO (KQx CHookApp();
}=dUASL // Overrides
&%@b;)]J // ClassWizard generated virtual function overrides
B# >7;xy> //{{AFX_VIRTUAL(CHookApp)
Y
,Iv<Hg public:
\F$V m'f_ virtual BOOL InitInstance();
r9nyEzk virtual int ExitInstance();
" vW4"R6 //}}AFX_VIRTUAL
LFzL{rny!U //{{AFX_MSG(CHookApp)
-W/Lg5eK // NOTE - the ClassWizard will add and remove member functions here.
b9F:X // DO NOT EDIT what you see in these blocks of generated code !
ma!rZn //}}AFX_MSG
9hJlc DECLARE_MESSAGE_MAP()
hu]l{TXi };
FN$sST LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
kM0TQX)$m BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Bb,l.w BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3Kx&+ BOOL InitHotkey();
JE a~avyJ BOOL UnInit();
tJ"8"T#6Vr #endif
6aw1 zS9HR1 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
`b11,lg #include "stdafx.h"
!mjrI "_ #include "hook.h"
Jv,*rQH #include <windowsx.h>
^\ N@qL #ifdef _DEBUG
#~_ZG% u #define new DEBUG_NEW
| 61W-9; #undef THIS_FILE
5f~49(v] static char THIS_FILE[] = __FILE__;
}{R?i,j( #endif
I"=a:q #define MAX_KEY 100
c#ahFpsnlw #define CTRLBIT 0x04
6njwrqo #define ALTBIT 0x02
%nRz~3X|+v #define SHIFTBIT 0x01
9JDdOjqo #pragma data_seg("shareddata")
]4uY<9VL HHOOK hHook =NULL;
F*}.0SQ UINT nHookCount =0;
.T>^bLuFy static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
8 h.Dc&V static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
R{3?`x!fY static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
K P1;u #v static int KeyCount =0;
4x2
;@Pd static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
#OQT@uF! #pragma data_seg()
fEWXC|" HINSTANCE hins;
KW&vX%i(. void VerifyWindow();
)K.'sX{B BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
0qCx.<"p8# //{{AFX_MSG_MAP(CHookApp)
[P3].#"]M= // NOTE - the ClassWizard will add and remove mapping macros here.
69/br @j%` // DO NOT EDIT what you see in these blocks of generated code!
z0jF.ub //}}AFX_MSG_MAP
;(F_2&he
END_MESSAGE_MAP()
nlq"OzcH04 Izapx\GK9 CHookApp::CHookApp()
Rv/=bY {
$:RP tG // TODO: add construction code here,
3axbWf3[ // Place all significant initialization in InitInstance
*_ U=KpZF }
R7
WGc[ 'm4v)w<y# CHookApp theApp;
Bvai
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,rU>)X {
4Odf6v,*@ BOOL bProcessed=FALSE;
%>mB"Y, if(HC_ACTION==nCode)
[PhT
zXt {
8fH.E if((lParam&0xc0000000)==0xc0000000){// Key up
=o+js;3 switch(wParam)
-~|E(ys {
)LdS1% case VK_MENU:
mu>L9Z~(L_ MaskBits&=~ALTBIT;
i?+>,r@\p break;
< %t$0' case VK_CONTROL:
V6CRl&ZKO MaskBits&=~CTRLBIT;
&^I2NpT break;
0ECQ>Ux: case VK_SHIFT:
67{3/(`x MaskBits&=~SHIFTBIT;
`J26Y"]P break;
/SvB
w>gQ default: //judge the key and send message
}#Q?\ break;
6p}dl>T_y }
ar%!h~ for(int index=0;index<MAX_KEY;index++){
2," ( if(hCallWnd[index]==NULL)
p%]ZG, continue;
Jg2*$gL;_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
n a3st*3V_ {
Cu`uP[# ch SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Lc?q0x^s bProcessed=TRUE;
kWKAtv5@w }
q=J8SvSRl }
hgmo b"o }
~\QN.a else if((lParam&0xc000ffff)==1){ //Key down
)/Mk\``j switch(wParam)
X%lk] &2 {
HC$rC"f case VK_MENU:
xV+cX*4h MaskBits|=ALTBIT;
qQ/<\6Sl break;
? JliKFD% case VK_CONTROL:
BM+>. MaskBits|=CTRLBIT;
{I9<W'k{ break;
i\yp(tE%^ case VK_SHIFT:
_KSlIgQ
}0 MaskBits|=SHIFTBIT;
@@QB,VS;{< break;
ol #4AU` default: //judge the key and send message
^*@D%U break;
4*Y`Pn@ }
0%b!ARix for(int index=0;index<MAX_KEY;index++)
UVlXDebl {
ySP%i6!au if(hCallWnd[index]==NULL)
KrzIL[;2o continue;
ZR|n\. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-SeHz.`N {
j}F;Bfq! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
'0tNo.8K bProcessed=TRUE;
KM&bu='L^ }
8_h:_7e }
!gX(Vh*k }
Y2&hf6BE if(!bProcessed){
}
>zl for(int index=0;index<MAX_KEY;index++){
&f_ua)cyY if(hCallWnd[index]==NULL)
6EY W:o continue;
11Y4oS if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
])vWvNx SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4Mr)~f rc }
0\tdxi }
xC^| S0B }
e{k)]]J return CallNextHookEx( hHook, nCode, wParam, lParam );
BqG7Et }
#P/}'rdt $>6Kn`UX BOOL InitHotkey()
ll#_v^ {
h#?)H7ft if(hHook!=NULL){
NB)$l2<d nHookCount++;
d xk~ return TRUE;
1_MaaA;ow" }
ps&p| else
*;!p#qL hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
c[zaYcbl if(hHook!=NULL)
&$<7]a\dM nHookCount++;
rd
hM#? return (hHook!=NULL);
K=Y{iHn }
QKt+Orz BOOL UnInit()
=Dc9|WuHN {
C[2LP$6*/ if(nHookCount>1){
1yT\|2ARZ% nHookCount--;
I>n2# -8 return TRUE;
hutdw> }
hY}.2 BOOL unhooked = UnhookWindowsHookEx(hHook);
a&)4Dv0 if(unhooked==TRUE){
_a&Mk nHookCount=0;
<v+M ~"%V hHook=NULL;
OtD!@GQ6 }
F0 ^kUyF| return unhooked;
E
As1
= }
$?Z-BD1 ,Jqk0cW2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E*]%@6tH {
2& ZoG%) BOOL bAdded=FALSE;
?I}0[+)V for(int index=0;index<MAX_KEY;index++){
NWt5)xl if(hCallWnd[index]==0){
Ou,Eu05jt' hCallWnd[index]=hWnd;
& 8'QD~ HotKey[index]=cKey;
yIG* HotKeyMask[index]=cMask;
0OF ]|hH bAdded=TRUE;
nA 5-P} KeyCount++;
LAcK% break;
Y>a2w zr }
x^u[L$ }
IKVS7m return bAdded;
h6uv7n~4 }
(8d"G9R( J]mq|vE BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
|:G`f8q9 {
^E| {i]j#f BOOL bRemoved=FALSE;
ly)L%hG for(int index=0;index<MAX_KEY;index++){
kp>AZVk if(hCallWnd[index]==hWnd){
8iKupaaOX if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
4M3{P hCallWnd[index]=NULL;
S1G=hgF_L HotKey[index]=0;
OYwH$5 HotKeyMask[index]=0;
ns;nle|m bRemoved=TRUE;
IP-}J$$1 KeyCount--;
QCVwslj,K break;
ppXt8G3%x }
w?Nx^)xX }
q@8j[15 }
Yt#e[CYnu return bRemoved;
81&5g' }
r5(-c]E7 [2Rw)!N void VerifyWindow()
xGVL|/?8 {
^ Z~'>J for(int i=0;i<MAX_KEY;i++){
[/Ya4=C@ if(hCallWnd
!=NULL){ _?J:Z*z?
if(!IsWindow(hCallWnd)){ oMer+=vH
hCallWnd=NULL; x"xtILrI
HotKey=0; Sh2;^6d
HotKeyMask=0; J2P5<
KeyCount--; elw}(l<F
} E])X$:P?
} WTZr{)e
} }2i3
} @o6^"
53jtwklA
BOOL CHookApp::InitInstance() o;<oXv
{ MF%>avRj
AFX_MANAGE_STATE(AfxGetStaticModuleState()); wD'LX
hins=AfxGetInstanceHandle(); SYZS@o
InitHotkey(); 6yRxb(
return CWinApp::InitInstance(); W$_@9W(Bl
} {8as _
kTe0"
int CHookApp::ExitInstance() ;.wWw" )
{ km+}./@
VerifyWindow(); Ls~F4ar$/
UnInit(); EPMdR66
return CWinApp::ExitInstance(); u%`4;|tI
} S/l?wwD
+ysP#uAA
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \JX.)&>
-
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |=CV.Su
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Tr@}
#if _MSC_VER > 1000
{@gTs
#pragma once g6=w
MRt[
#endif // _MSC_VER > 1000 q<` g
Q?\rwnW?U
class CCaptureDlg : public CDialog r\sQ8/
{ k2S6 SB
// Construction MX.=k>
public: !Qd4Y=
BOOL bTray; ND|!U#wMNV
BOOL bRegistered; DTw3$:
BOOL RegisterHotkey(); 3%$nRP
X
UCHAR cKey; 0W1=9+c|X
UCHAR cMask; 5lMm8<v
void DeleteIcon(); _a3,Zuv
void AddIcon(); ;2=H7dq
UINT nCount; zXH CP.Rmg
void SaveBmp(); (!0=~x|Z[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5$ra4+k0
// Dialog Data "77 j(Vs9
//{{AFX_DATA(CCaptureDlg) `1$7. ydQ
enum { IDD = IDD_CAPTURE_DIALOG }; Vgh_F8G!V
CComboBox m_Key; RW@sh9
BOOL m_bControl; k 8Swra?j
BOOL m_bAlt; k!lz_Y
BOOL m_bShift; l'2a?1/q
CString m_Path; I}a iy.l
CString m_Number; @I '_
//}}AFX_DATA qq+fUfB2:
// ClassWizard generated virtual function overrides 3B<$6
//{{AFX_VIRTUAL(CCaptureDlg) j+c<0,Kj
public: h6dVT9
virtual BOOL PreTranslateMessage(MSG* pMsg); 2@ <x%T
protected: 8R6!SB
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JRC+>'}Xj
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }"'^.FG^_
//}}AFX_VIRTUAL yn[^!GuJ_
// Implementation 'b*
yYX<
protected: n>Rt9
HICON m_hIcon; x@I(G "
// Generated message map functions U&D"fM8
//{{AFX_MSG(CCaptureDlg) )&j4F)
virtual BOOL OnInitDialog(); 7O)U(<70
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5$e|@/(0
afx_msg void OnPaint(); Xh,{/5m
afx_msg HCURSOR OnQueryDragIcon(); 9W{=6D86e
virtual void OnCancel(); C
NNyz$
afx_msg void OnAbout(); /8GgEW9Q~G
afx_msg void OnBrowse(); IR+dGqIjZb
afx_msg void OnChange(); >!OD[9
//}}AFX_MSG XZv(B^
DECLARE_MESSAGE_MAP() ~7W?W<
}; IQS:tL/
#endif T>&d/$;]
wnL\.%Y^
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0wLu*K5$4E
#include "stdafx.h" d (Fb_
#include "Capture.h" 7J]tc1-re
#include "CaptureDlg.h" Yd4J:
#include <windowsx.h> l!plw,PYC
#pragma comment(lib,"hook.lib") &sp7YkaW
#ifdef _DEBUG P8Bv3
#define new DEBUG_NEW pr8eRV!x
#undef THIS_FILE dooS|Mq
static char THIS_FILE[] = __FILE__; z\,g %u41
#endif g3%Xh0007{
#define IDM_SHELL WM_USER+1 k;w1y(
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `4RraJj>0~
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @N,EoSb :
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :t6w+h
class CAboutDlg : public CDialog 5'/Ney9N
{ SsDe\"?Q
public: ThX%Uzd"[;
CAboutDlg(); ?v>!wuiP
// Dialog Data lCDu,r;\
//{{AFX_DATA(CAboutDlg) 2Y)3Ue
enum { IDD = IDD_ABOUTBOX }; jmbwV,@Q2
//}}AFX_DATA (KDUX
t.
// ClassWizard generated virtual function overrides Tw< N
//{{AFX_VIRTUAL(CAboutDlg) a a=GW%
protected: 0Ii*
"?s
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Cg/L/0Ak
//}}AFX_VIRTUAL /2K4ka<?7
// Implementation =h?WT*
protected: y]B?{m``6
//{{AFX_MSG(CAboutDlg) 7u!i)<pn
//}}AFX_MSG ){|Bh3XV
DECLARE_MESSAGE_MAP() *.0}3
}; TC80nP
/vi>@a
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ty|E[Ez1
{ Ll%CeP
//{{AFX_DATA_INIT(CAboutDlg) 5Xu2MY=
//}}AFX_DATA_INIT EX%KfWDr
} _ cK"y2
IcMfZ{H1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {)j3Pn
{ a$p?r3y
CDialog::DoDataExchange(pDX); wK+%[i&,
//{{AFX_DATA_MAP(CAboutDlg) N/QTf1$
//}}AFX_DATA_MAP Z~o6%_xe
} \WG6\Zg0A
|*5K fxq
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?(el6 J}
//{{AFX_MSG_MAP(CAboutDlg) Xm./XC
// No message handlers P08=?
//}}AFX_MSG_MAP +1R?R9^Fw
END_MESSAGE_MAP() -t_t3aU|
bT<if@h-
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) n}MW# :eJe
: CDialog(CCaptureDlg::IDD, pParent) Yy6Mkw7X
{ )-q#hY
//{{AFX_DATA_INIT(CCaptureDlg) :c@v_J6C&
m_bControl = FALSE; 5F{NPKaQ
m_bAlt = FALSE; TU4"7]/{M
m_bShift = FALSE; QS:dr."k
m_Path = _T("c:\\"); eAh~`
m_Number = _T("0 picture captured."); `LU[+F8<
nCount=0; +:3K?G-
bRegistered=FALSE; ct+ ;W
bTray=FALSE; g5X;]%:
//}}AFX_DATA_INIT ;uj&j1
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 QFMR~6 ?
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F!*u}8/_!
} duCxYhh|
<R)%K);
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) p
R=FH#
{ fvn`$
CDialog::DoDataExchange(pDX); DD`Bl1)
//{{AFX_DATA_MAP(CCaptureDlg) &~of]A
DDX_Control(pDX, IDC_KEY, m_Key); O4w6\y3U
DDX_Check(pDX, IDC_CONTROL, m_bControl); ?ACflU_k
DDX_Check(pDX, IDC_ALT, m_bAlt); +eSNwR=
DDX_Check(pDX, IDC_SHIFT, m_bShift); *Y"Kbn6
DDX_Text(pDX, IDC_PATH, m_Path); dWbSrl
DDX_Text(pDX, IDC_NUMBER, m_Number); egMl(~D
//}}AFX_DATA_MAP RKoM49W
} jC3ta
EkotVzR5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !sWKi)1
//{{AFX_MSG_MAP(CCaptureDlg) u;f${Wn'3
ON_WM_SYSCOMMAND() 22aS
<@}
ON_WM_PAINT() 84v7g`lrR
ON_WM_QUERYDRAGICON() .{[+d3+,
ON_BN_CLICKED(ID_ABOUT, OnAbout) tHAr9
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P;_}nbB
ON_BN_CLICKED(ID_CHANGE, OnChange) t*Hr(|.
//}}AFX_MSG_MAP FCL7Tn
END_MESSAGE_MAP() ZbVo<p5* ]
[=k$Q
(.3
BOOL CCaptureDlg::OnInitDialog() f]Jn\7j4
{ H9}z0VI
CDialog::OnInitDialog(); ;}v#hKC~
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "M#A `b
ASSERT(IDM_ABOUTBOX < 0xF000); jdz]+Q`jq
CMenu* pSysMenu = GetSystemMenu(FALSE); Dv~W!T i
if (pSysMenu != NULL) 0LEJnl
{ 84g$V}mp
CString strAboutMenu; \)KLm
strAboutMenu.LoadString(IDS_ABOUTBOX); I`k%/ei38
if (!strAboutMenu.IsEmpty()) WzD=Ol
{ 1iNq|~
pSysMenu->AppendMenu(MF_SEPARATOR); Vwxb6,}Z
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); P2la/jN
} bMe/jQuL.$
} &QHZ]2%U
SetIcon(m_hIcon, TRUE); // Set big icon gR7in!8
SetIcon(m_hIcon, FALSE); // Set small icon D%[yAr;r
m_Key.SetCurSel(0); PkM]jbLe8
RegisterHotkey(); ^pgVU&-~]/
CMenu* pMenu=GetSystemMenu(FALSE); n~ w.\939@
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); }7?n\I+n"
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vmEbk/Vy
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {A<pb{<u
return TRUE; // return TRUE unless you set the focus to a control P/%5J3_,
} yN-o?[o
X5[.X()M4
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +H"[WZ5
{ N@}5Fnk-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 90g=&O5@O
{ s{g^K#BoFi
CAboutDlg dlgAbout; R( 2,1f=d
dlgAbout.DoModal(); vwF#;jj\
} O_vCZW
a3
else jEK{QOq0
{ b&wyp@k
CDialog::OnSysCommand(nID, lParam); KZeaM
} ^w|D^F=o
} SZ$~zT;c
K=Q<G:+&V
void CCaptureDlg::OnPaint() Bs?B\k=
{ eKpWFP0
if (IsIconic()) i&K-|[3{g
{ DIAHIV<
CPaintDC dc(this); // device context for painting fHFy5j0H
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); || p>O
// Center icon in client rectangle eMT}"u8$A
int cxIcon = GetSystemMetrics(SM_CXICON); JSp V2c5Q
int cyIcon = GetSystemMetrics(SM_CYICON); J}zN]|bz
CRect rect; \S5YS2,P
GetClientRect(&rect); W20qn>{z
int x = (rect.Width() - cxIcon + 1) / 2; -_`dA^
int y = (rect.Height() - cyIcon + 1) / 2; X(r$OZ
// Draw the icon `1xJ1z#
dc.DrawIcon(x, y, m_hIcon); \US'tF)/
} 62s0$vw
else FaA'%P@
{ n]nb+_-97
CDialog::OnPaint(); Z'Uc}M'U
} %"yy8~|
} :t)<$dtf[
]h3{MTr/
HCURSOR CCaptureDlg::OnQueryDragIcon() 0:C ^-zrx
{ ,ma4bqRMc
return (HCURSOR) m_hIcon; !tuN_
} rlRRGJ\l
au+6ookT
void CCaptureDlg::OnCancel() a ]b%v9
{ "gIjU~'A
if(bTray) $bo,m2)
DeleteIcon(); \I-bZ|^
CDialog::OnCancel(); n0
q$/Y.
} Jxo#sV-
pw,
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void CCaptureDlg::OnAbout() :Vnus
@#r
{ T[(4z@d`5
CAboutDlg dlg; ]ykMh
dlg.DoModal(); =w,cdU*
} }LA7ku
+$CO
void CCaptureDlg::OnBrowse() #Y_v0.N
{ E9N.b.Q)
CString str; *B*dWMh
BROWSEINFO bi; 8+|7*Ud
char name[MAX_PATH]; <&CzM"\Em
ZeroMemory(&bi,sizeof(BROWSEINFO)); &sA@!
bi.hwndOwner=GetSafeHwnd(); Y^(NzN
bi.pszDisplayName=name; Kk9eJ\
bi.lpszTitle="Select folder"; ZHN}:W/p
bi.ulFlags=BIF_RETURNONLYFSDIRS; -~+Y0\%E
LPITEMIDLIST idl=SHBrowseForFolder(&bi); a +lTAe
if(idl==NULL) Y I?4e7Z+
return; dN)@/R^E;
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $`'%1;y@
str.ReleaseBuffer(); Ld4Jp`Zg
m_Path=str; b%_[\((
if(str.GetAt(str.GetLength()-1)!='\\') +Rq7m]
m_Path+="\\"; "k>;K,:
UpdateData(FALSE); p=jIDM'
} $T2n^yz
`21$e
void CCaptureDlg::SaveBmp() G5Z_[Q~z
{ j0(+Kq:J
CDC dc; X"fSM
#
dc.CreateDC("DISPLAY",NULL,NULL,NULL); K/A1g.$
CBitmap bm; kf-/rC)>
int Width=GetSystemMetrics(SM_CXSCREEN); j"Y5j
B`
int Height=GetSystemMetrics(SM_CYSCREEN); d{FD.eI0
bm.CreateCompatibleBitmap(&dc,Width,Height); >XU93 )CX
CDC tdc; (
L ]C
tdc.CreateCompatibleDC(&dc); )BX-Y@fpA
CBitmap*pOld=tdc.SelectObject(&bm); uzO3 _.4Y
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~=Q|EhF5
tdc.SelectObject(pOld); p}K\rpvJpu
BITMAP btm; $ 0Up.
bm.GetBitmap(&btm); w=}R'O;k
DWORD size=btm.bmWidthBytes*btm.bmHeight; dt1,!sHn
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /OsTZ"*.2/
BITMAPINFOHEADER bih;
1k39KO@
bih.biBitCount=btm.bmBitsPixel; ]/TqPOi:
bih.biClrImportant=0; K[Ao_v2g
bih.biClrUsed=0; =>u9k:('9
bih.biCompression=0; ;Y@"!\t}
bih.biHeight=btm.bmHeight; zKf.jpF^
bih.biPlanes=1; D Kng.P
bih.biSize=sizeof(BITMAPINFOHEADER); B`;DAsmT
bih.biSizeImage=size; _
ATIV
bih.biWidth=btm.bmWidth; ?5Ub&{
bih.biXPelsPerMeter=0; c&>==pI]k
bih.biYPelsPerMeter=0; >XomjU[srQ
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )u}My Fl.
static int filecount=0; ;Y"*Z2U
CString name; Z:kX9vw.
name.Format("pict%04d.bmp",filecount++); ufc_m4PN
name=m_Path+name; /sa\Ze;E
BITMAPFILEHEADER bfh; 0Ik}\lcn
bfh.bfReserved1=bfh.bfReserved2=0; ndxijqw
bfh.bfType=((WORD)('M'<< 8)|'B'); wJb"X=i*
bfh.bfSize=54+size; {z0PB] U
bfh.bfOffBits=54; M
hJ;)(
CFile bf; EVE<LF?
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 63Dm{
2i}F
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *=~X1s
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); lBcRt)_O7
bf.WriteHuge(lpData,size); qcdENIy0b
bf.Close(); ]>'yt #]
nCount++; 3!<} -sW4
} B_uAa5'
GlobalFreePtr(lpData); oHj64fE9
if(nCount==1) U.0bbr
m_Number.Format("%d picture captured.",nCount); \[ 5mBuk
else +/Vi"
m_Number.Format("%d pictures captured.",nCount); [-*8S1
UpdateData(FALSE); J6m(\o
}
)9mUE*[
%. -nZ C
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R`F8J}X_
{ `<x|<ey
if(pMsg -> message == WM_KEYDOWN) VjhwafYC
{ *d/,Y-tl
if(pMsg -> wParam == VK_ESCAPE) |=U(8t
return TRUE; /@~&zx&_
if(pMsg -> wParam == VK_RETURN) BH$+{rZ8t
return TRUE; %\n&iRwDF
} GP._C=] ?c
return CDialog::PreTranslateMessage(pMsg); g"&e*fF
} ~hxo_&
r1!]<= &\
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) GP,xGZZ
{ |0A:0'uA!
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z,#3YC{'
SaveBmp(); Me|+)}'p5h
return FALSE; twA2U7F
} 0-{l4;o
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ G*$a81dAX
CMenu pop; VtJy0OGcRP
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); T.j&UEsd
CMenu*pMenu=pop.GetSubMenu(0); ;N/=)m
pMenu->SetDefaultItem(ID_EXITICON); !s:v UY58
CPoint pt; H%:u9DlEK/
GetCursorPos(&pt); <(<19t5 .
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); B%e#u.'6
if(id==ID_EXITICON) .1 =8c\%
DeleteIcon();
UW/{q`)
else if(id==ID_EXIT) 7Yjxx+X9
OnCancel(); 05>xQx?"m4
return FALSE; FII>6c
} R.+yVO2
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {<_9QAS
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) iTq~^9G
AddIcon(); .Iret:
return res; !agtgS$qII
} /\B[lRn
gUq)M
void CCaptureDlg::AddIcon() {=K u9\
{ v8L&F9
o
NOTIFYICONDATA data; +v}R-gNR
data.cbSize=sizeof(NOTIFYICONDATA); (KDv>@5
CString tip; w'b|*_Q4Q
tip.LoadString(IDS_ICONTIP); xp>p#c
data.hIcon=GetIcon(0); 95G*i;E
data.hWnd=GetSafeHwnd(); 9ywPWT[^
strcpy(data.szTip,tip); ?-e'gC
data.uCallbackMessage=IDM_SHELL; i%R2#F7I
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]&D;'),
data.uID=98; Q hHexr6
Shell_NotifyIcon(NIM_ADD,&data); ;%R+]&J
ShowWindow(SW_HIDE); `Y`QxU!d%
bTray=TRUE; pd rF/U+
} L'J Ekji"
7v~\c%1V
void CCaptureDlg::DeleteIcon() F
;m1I+;
{ Jc#()4
NOTIFYICONDATA data; %Jr6pmc
data.cbSize=sizeof(NOTIFYICONDATA); 2 #+g4
data.hWnd=GetSafeHwnd(); VK)K#!O8
data.uID=98; 5_mb+A n,
Shell_NotifyIcon(NIM_DELETE,&data); 1Jx|0YmO
ShowWindow(SW_SHOW); Kb# }f/
SetForegroundWindow(); 3GS oHsNk
ShowWindow(SW_SHOWNORMAL); 32flOi:
bTray=FALSE; Odo"S;)
} -;?5<>zZ
w]{NaNIeq1
void CCaptureDlg::OnChange() }0({c~z\
{ ]bq<vI%
RegisterHotkey(); 8 '2lc
} PG1#Z?_
R":nG7o
BOOL CCaptureDlg::RegisterHotkey() p5KM(N6f
{ f]BG`rJX
UpdateData(); E&/D%}Wl
UCHAR mask=0; "5-S:+
UCHAR key=0; \sIRV}Tk}N
if(m_bControl) Cz\(.MWNZ
mask|=4; $UZ4,S?V
if(m_bAlt) 35;)O -
mask|=2; BHwQB2t gc
if(m_bShift) cs ?@Ri=g
mask|=1; jG3}V3|.
key=Key_Table[m_Key.GetCurSel()]; S"iQQV{)Z
if(bRegistered){ vYD>m~Qc^
DeleteHotkey(GetSafeHwnd(),cKey,cMask); {9<2{$Og
bRegistered=FALSE; GLe(?\Ug=
} *mM+(]8US
cMask=mask; bT@7&
cKey=key; V;Zp3Qo!
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); fNi&1J-/
return bRegistered; Hy<4q^3$G
} ><X!~by
TA}z3!-y*
四、小结 Qhnz7/a9
sBuVm<H
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。