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:
g)B]FH1
a9Vi]; 一、实现方法
:11
A r_d!ikOT( 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:
SX#&5Ka/ ^rz_f{c]- #pragma data_seg("shareddata")
L},_.$I? HHOOK hHook =NULL; //钩子句柄
:'ptuY UINT nHookCount =0; //挂接的程序数目
CN?gq^ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
jWgX_//! static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
s#MPX3itK static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
FTldR;}( static int KeyCount =0;
YYS0` static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
O0:q;<>z #pragma data_seg()
|BYRe1l6l ykJ>*z 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
C,zohlpC )B*t
:tN DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
kf9X$d6 ; @X<lCk BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Bp{Ri_&A cKey,UCHAR cMask)
I 6O {
bMBLXk BOOL bAdded=FALSE;
d 'ifLQ\ for(int index=0;index<MAX_KEY;index++){
=lSNs if(hCallWnd[index]==0){
7Yy ; hCallWnd[index]=hWnd;
4z)]@:`}z HotKey[index]=cKey;
ABkl%m6xf HotKeyMask[index]=cMask;
"jCu6Rj d bAdded=TRUE;
h`KU\X )A KeyCount++;
<naz+QK' break;
[B3RfCV{ }
SWLo|)@[/ }
ZC8wA;!z^ return bAdded;
,u m|1dh }
)}vl\7= //删除热键
kT=8e;K
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lx i<F {
[ hsds\ BOOL bRemoved=FALSE;
8k79&| for(int index=0;index<MAX_KEY;index++){
M%#e1"n if(hCallWnd[index]==hWnd){
2qp#N% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
P2Y^d#jO hCallWnd[index]=NULL;
d5d@k HotKey[index]=0;
Y*hCMy; HotKeyMask[index]=0;
h];I{crh bRemoved=TRUE;
cCX*D_kCB KeyCount--;
(sj,[
break;
[-&Zl(9& }
]^]wP]R_ }
kVL.PY\K }
u:EiwRW return bRemoved;
`X8F`5&U\f }
V.Mry`9- TC"<g $xQL]FmS DLL中的钩子函数如下:
adw2x pj .(vwIb8\_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
.V*^|UXbHi {
Pc9H0\+Xk BOOL bProcessed=FALSE;
T0
{L q: if(HC_ACTION==nCode)
;rS{: {
KlqY@Xt if((lParam&0xc0000000)==0xc0000000){// 有键松开
Js;h% switch(wParam)
hOeRd#AQK {
I_BJH'!t case VK_MENU:
~s{$WL& MaskBits&=~ALTBIT;
4\i[m:e=@ break;
r
:dTz case VK_CONTROL:
/O9EQ Pm( MaskBits&=~CTRLBIT;
1&2>LE/P break;
3a|\dav% case VK_SHIFT:
T;#FEzBz MaskBits&=~SHIFTBIT;
oU/5 a>9~ break;
cNH7C"@GVu default: //judge the key and send message
_G0x3 break;
;Qq\DFe.w }
~5g ~;f[4 for(int index=0;index<MAX_KEY;index++){
`{Ul! if(hCallWnd[index]==NULL)
YS ][n_ continue;
qWw=8Bq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o(HbGHIP {
yHGADH0B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
+n)9Tz5 bProcessed=TRUE;
Z]ONh }
<}LC~B! }
5X+A"X
;C }
g+lCMW\ else if((lParam&0xc000ffff)==1){ //有键按下
0aAoV0fMDz switch(wParam)
2?x4vI
np; {
H#&00 Q[ case VK_MENU:
h$*!8=M MaskBits|=ALTBIT;
Ls%MGs9PI break;
w(rE`IgW case VK_CONTROL:
6nQq MaskBits|=CTRLBIT;
}M+7T\J! break;
M?qy(zb case VK_SHIFT:
$u.z*b_yy MaskBits|=SHIFTBIT;
D]}G.v1 break;
Yz b XuJ4 default: //judge the key and send message
.u:GjL'$ break;
a
=QCp4^ }
z:;CX@)* for(int index=0;index<MAX_KEY;index++){
,s(,S if(hCallWnd[index]==NULL)
ZW}_DT0 continue;
8_8l.!~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=Uh$&m {
nR~(0G,H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
nK,w]{<wG! bProcessed=TRUE;
hQi2U }
}*-@!wc-N }
>/|*DI-HJ }
Uv.)?YeGh if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
TNth for(int index=0;index<MAX_KEY;index++){
+0~YP*I`/ if(hCallWnd[index]==NULL)
vbNBLCwug continue;
2|L&DF:G if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
PdCEUh\>y SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
6pzSp //lParam的意义可看MSDN中WM_KEYDOWN部分
s CRdtP }
OH88n69 }
G9lUxmS< }
E3i4=!Y return CallNextHookEx( hHook, nCode, wParam, lParam );
6-I'>\U~ }
!?XC1xe~R +H.`MZ= 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
]A"h&`Cvt ;]iRk BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G#CXs:1pd+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
liZxBs
:%i hj:,S| 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
*Uh!>Iv; RpK@?[4s LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
u"8yK5! {
Q@niNDaW2 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
zTp"AuNHN {
;r8X.>P* //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
,>M[@4`,U SaveBmp();
+%&yJ4- return FALSE;
;,TFr}p` }
\8
":]EU …… //其它处理及默认处理
Tk>#G{Wb- }
yuVs
YV@" GmG5[?)
<Uur^uB 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
y(&Ac[foS} 6mE\OS-I 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
j [a(#V{ ZoeD:xnh[ 二、编程步骤
TV:9bn?r) 5bIw?%dk( 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
SKtr tm -} +[ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
S3#>9k;p So;<6~ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
.6> w'F{> l.]xB,k 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
B[}6-2<>?C H.;Q+A,8^ 5、 添加代码,编译运行程序。
pw#-_ @L`jk+Y0vF 三、程序代码
n|hNM?v GB^B r6 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
9$Y=orpWxr #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
83m3OD_y #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
H::bwn`Vc #if _MSC_VER > 1000
CAlCDfKW} #pragma once
@d_M@\r=j #endif // _MSC_VER > 1000
+_`7G^U?% #ifndef __AFXWIN_H__
E{\2='3\ #error include 'stdafx.h' before including this file for PCH
Y@v>FlqI{ #endif
YQ}o?Q$z #include "resource.h" // main symbols
*hrvYil2b class CHookApp : public CWinApp
*v`eUQ: {
Kq!3wb; public:
}b}m3i1 CHookApp();
~~.}ah/_d // Overrides
ta0|^KAA // ClassWizard generated virtual function overrides
xG 1nGO //{{AFX_VIRTUAL(CHookApp)
E$e5^G9 public:
fJ\[*5eiS virtual BOOL InitInstance();
*Ly6`HZ9 virtual int ExitInstance();
5(2;|I,T //}}AFX_VIRTUAL
0_/[k*Re //{{AFX_MSG(CHookApp)
y}
'@R$ // NOTE - the ClassWizard will add and remove member functions here.
2!\DPX // DO NOT EDIT what you see in these blocks of generated code !
iCoX&"lb //}}AFX_MSG
"tZe>>I DECLARE_MESSAGE_MAP()
e.%nRhSs3 };
^Pf WG* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
y7{?Ip4[ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
yauvXosX BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LD?sh"?b BOOL InitHotkey();
@iiT< BOOL UnInit();
/1 dT+> #endif
^
9sjj + 3gp%`c4 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=wJX0A| #include "stdafx.h"
K"6vXv4QO #include "hook.h"
=M1I> #include <windowsx.h>
{:s f7 #ifdef _DEBUG
qK+5NF| #define new DEBUG_NEW
Sdo-nt #undef THIS_FILE
A,]h),b static char THIS_FILE[] = __FILE__;
l{9Y #endif
Wqnc{oq|$ #define MAX_KEY 100
Sz~OX6L #define CTRLBIT 0x04
`L
zPotz #define ALTBIT 0x02
wzA$'+Mb #define SHIFTBIT 0x01
=|=(l)8 #pragma data_seg("shareddata")
&m3lXl HHOOK hHook =NULL;
bcyzhK= UINT nHookCount =0;
1 zZlC#V static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
]5O~+Nf static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
=]t|];c% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
GyIV
Hby static int KeyCount =0;
Xvv6~ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
O1lNAcpeM #pragma data_seg()
H\
% 7% HINSTANCE hins;
6863xOv{T void VerifyWindow();
1oS/`) BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
h8P)%p //{{AFX_MSG_MAP(CHookApp)
R-:2HRaA // NOTE - the ClassWizard will add and remove mapping macros here.
?[AD=rUC // DO NOT EDIT what you see in these blocks of generated code!
c$,P ~Ws' //}}AFX_MSG_MAP
HQ g^
h END_MESSAGE_MAP()
Dv"9qk sK{e*[I>W CHookApp::CHookApp()
ZNoDFf*h {
'F<TSy|4kI // TODO: add construction code here,
sB</DS // Place all significant initialization in InitInstance
XSDpRo }
'%qr.T
% CAJ'zA|o CHookApp theApp;
r$1Qf}J3= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
yevPHN"M {
)4OxY[2J BOOL bProcessed=FALSE;
*hx if(HC_ACTION==nCode)
yfSmDPh {
NUZl`fu1Z4 if((lParam&0xc0000000)==0xc0000000){// Key up
b-DvW4B switch(wParam)
M+>u/fldV {
UZMd~| case VK_MENU:
S!UaH>Rh MaskBits&=~ALTBIT;
uD'6mk* break;
h\o.&6sd case VK_CONTROL:
j^'go&p MaskBits&=~CTRLBIT;
8Wx=p#_ break;
%;_MGae case VK_SHIFT:
%{|p j
+ MaskBits&=~SHIFTBIT;
\<' ?8ri# break;
DF= *_,2/ default: //judge the key and send message
CY1Z' break;
.3;;;K9a~] }
paK2xX8E for(int index=0;index<MAX_KEY;index++){
*T/']t if(hCallWnd[index]==NULL)
(e~N q continue;
X,
n:,' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6'/ #+,d' {
D^O@'zP=At SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6N4~~O bProcessed=TRUE;
\85i+q:LuA }
gJXaPJA{ }
}OUt sh ]y }
N['.BN else if((lParam&0xc000ffff)==1){ //Key down
tA;}h7/Lc~ switch(wParam)
;`&kZi60Hz {
YWLj?+ case VK_MENU:
siI;"? MaskBits|=ALTBIT;
Upe%rC( break;
{mg2pfhB! case VK_CONTROL:
M >u_4AY MaskBits|=CTRLBIT;
QV!up^Zso break;
2ESo2 case VK_SHIFT:
]esC[r]PJ MaskBits|=SHIFTBIT;
^sw?gH* break;
EwN}l default: //judge the key and send message
i@yC-))bY break;
s_Sk0}e }
;TYBx24vD' for(int index=0;index<MAX_KEY;index++)
Dtk=[;"k2a {
Cye.gsCT if(hCallWnd[index]==NULL)
z_HdISy0 continue;
3w=J'(RU if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Vksuu@cch {
Hka2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
L,\Iasv bProcessed=TRUE;
\hXDO_U }
KoT\pY^7\ }
{FkF }
^W^OfY if(!bProcessed){
/wp6KXm for(int index=0;index<MAX_KEY;index++){
`3pW]&
if(hCallWnd[index]==NULL)
'DR!9De continue;
eFgA 8kY) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^[[P*NX3 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;uJMG }
7! Nsm }
Tk}]Gev }
#"!<W0 return CallNextHookEx( hHook, nCode, wParam, lParam );
TH;hO).u }
TOt dUO &
21%zPm BOOL InitHotkey()
]kSG R {
L0,'mS if(hHook!=NULL){
2G7Wi!J nHookCount++;
&d!GImcxQ return TRUE;
b}`TLn }
[JiH\+XLPs else
f|5co>Hk hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
7.Op< if(hHook!=NULL)
?9/G[[( nHookCount++;
sRs>"zAg return (hHook!=NULL);
.*oU]N%K= }
i5Ggf"![ BOOL UnInit()
e
,(mR+a8 {
**%37 if(nHookCount>1){
=cI(d , nHookCount--;
P
pb\6|* return TRUE;
fhiM U8(& }
V
gWRW7Se BOOL unhooked = UnhookWindowsHookEx(hHook);
Ml_^
`vn if(unhooked==TRUE){
79gT+~z nHookCount=0;
N8jIMb'< hHook=NULL;
Cdn J&N{ }
k[xSbs'D return unhooked;
HPl<%%TI }
pBHRa?Y5 x5Bk/e' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3og.y+.=U. {
_6Sp QW BOOL bAdded=FALSE;
4?kcv59 for(int index=0;index<MAX_KEY;index++){
(.:e,l{U% if(hCallWnd[index]==0){
ah "o~Cbj hCallWnd[index]=hWnd;
/uc>@!F HotKey[index]=cKey;
N~Jda
o HotKeyMask[index]=cMask;
r!v\"6:OM bAdded=TRUE;
D.:Zx KeyCount++;
?,z}%p break;
$Sq:q0 }
ch]IzdD }
Q &8-\ return bAdded;
}jXfb@`K }
O-wzz -7ep{p- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sJZiI}Xc {
,tFg4k[ BOOL bRemoved=FALSE;
YK_7ip.a[ for(int index=0;index<MAX_KEY;index++){
Rcuz(yS8 if(hCallWnd[index]==hWnd){
1MFbQs^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
x}4q {P5$ hCallWnd[index]=NULL;
9 hl_|r~%* HotKey[index]=0;
6ujWNf HotKeyMask[index]=0;
I9^x,F"E] bRemoved=TRUE;
&oNAv-m^GD KeyCount--;
Z,gk|M3. break;
hrk r'3lv }
wYea\^co }
mh%VrAq }
z{q`G wW return bRemoved;
a?1Wq }
KI.unP% *. t^MP void VerifyWindow()
W?&%x(6M {
xT8?&Bx for(int i=0;i<MAX_KEY;i++){
iZmcI;?u if(hCallWnd
!=NULL){ =pNY
eR_[
if(!IsWindow(hCallWnd)){ UKGPtKE<
hCallWnd=NULL; *~`(RV
HotKey=0; h[ ZN+M
HotKeyMask=0; Cp N>p.kM
KeyCount--; Wwo0%<2y
} e-;}366}
} !WlH'y-I
} WH\d| 1)
} l/D}
X
;uW FHc5@B
BOOL CHookApp::InitInstance() ib m4fa
{ pH;%ELZ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); /r 5eWR1G
hins=AfxGetInstanceHandle(); y =@N|f!
InitHotkey(); 4H/OBR
return CWinApp::InitInstance(); SbZ6t$"
} st*gs-8jJ;
/Oono6j
int CHookApp::ExitInstance() Ri'n
{ +ZYn? #IQ
VerifyWindow(); !D6]JPX
UnInit(); P>T"cv
return CWinApp::ExitInstance(); NK+o1
} KvSG;
4i bc
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xw%0>K[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {g6%(X\r.r
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ x-c"%Z|
#if _MSC_VER > 1000 bt *k.=p
#pragma once d9ihhqq3}
#endif // _MSC_VER > 1000 Bvj0^fSm
-Za/p@gM
class CCaptureDlg : public CDialog =N@t'fOr
{ }]TxlSp!;
// Construction *hrd5na
public: INf&4!&h
BOOL bTray; CLSK'+l
BOOL bRegistered; Xj*Wu_
BOOL RegisterHotkey(); hZ3bVi)L\
UCHAR cKey; 5;?yCWc
UCHAR cMask; 1M-pr 8:6s
void DeleteIcon(); ,Q B<7a+I
void AddIcon(); G3]4A&h9v~
UINT nCount; E7hhew
void SaveBmp(); rNM;ZPF#
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?%86/N>
// Dialog Data w!CNRtM:~
//{{AFX_DATA(CCaptureDlg) 6zkaOA46V
enum { IDD = IDD_CAPTURE_DIALOG }; B!yr!DWv
CComboBox m_Key; dx]>(e@(t{
BOOL m_bControl; /?!u{(h }
BOOL m_bAlt; !k%#R4*>
BOOL m_bShift; q4q6c")zp
CString m_Path; ex|F|0k4}
CString m_Number; @x1-!
~z#
//}}AFX_DATA $(
)>g>%
// ClassWizard generated virtual function overrides g`^x@rj`E
//{{AFX_VIRTUAL(CCaptureDlg) V :eD]zq5
public: =43auFY-P
virtual BOOL PreTranslateMessage(MSG* pMsg); @o^Ww
protected: ;jPXs
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e)ZUO_Q$
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); AGno6g
//}}AFX_VIRTUAL BVm0{*-[|
// Implementation DlT{`
protected: Mtv?:q
HICON m_hIcon; BY*Q_Et
// Generated message map functions |%wX*zaf
//{{AFX_MSG(CCaptureDlg) %\DX#.
virtual BOOL OnInitDialog(); Jwp7gYZ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 'S~5"6r
afx_msg void OnPaint(); ~
1 pr~
afx_msg HCURSOR OnQueryDragIcon(); (t.Nk[
virtual void OnCancel(); *VeRVaBl
afx_msg void OnAbout(); 5;S.H#YOpO
afx_msg void OnBrowse(); bcR_E5x$
afx_msg void OnChange(); % nIf)/2g
//}}AFX_MSG AS,%RN^.
DECLARE_MESSAGE_MAP() ;=@0'xPEa-
}; -8Xf0_
#endif +#By*;BJ
vy/-wP|1
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h~26WLf.
#include "stdafx.h" :EH=_"
#include "Capture.h" S$3JMFA
#include "CaptureDlg.h" :KN-F86i
#include <windowsx.h>
7.T?#;'3
#pragma comment(lib,"hook.lib") C?Ucu]cW
#ifdef _DEBUG X.V~SeS
#define new DEBUG_NEW __@BUK{ q
#undef THIS_FILE YP9^Bp{0
static char THIS_FILE[] = __FILE__; 9cgUT@a
#endif zJXplvaL;
#define IDM_SHELL WM_USER+1 z=FZiH
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .-=vx r
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uMv1O{
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *kVV+H<X|b
class CAboutDlg : public CDialog b\ PgVBf9
{ +3`alHUK
public: [V!tVDs&'o
CAboutDlg(); dd["dBIZ '
// Dialog Data 2Hdu:"j
//{{AFX_DATA(CAboutDlg) ]d`VT)~vje
enum { IDD = IDD_ABOUTBOX }; *dF>_F
//}}AFX_DATA OH"XrCX7n
// ClassWizard generated virtual function overrides e%6QTg5#
//{{AFX_VIRTUAL(CAboutDlg) &?vgP!d&M
protected: i&k7-<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vj*%Q(E6Pt
//}}AFX_VIRTUAL P&q7|ST%N
// Implementation cFv8 Od
protected: qVPeB,kIz
//{{AFX_MSG(CAboutDlg) rbQR,Nf2x
//}}AFX_MSG CNIsZv@Q
DECLARE_MESSAGE_MAP() h1{3njdr
}; ~v83pu1!2s
5?L<N:;J_
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) KU;9}!#
{ Q &t<Y^B
//{{AFX_DATA_INIT(CAboutDlg) xCKRxF
//}}AFX_DATA_INIT Ha#>G<;n
} WKU=.sY
SB7c.H,
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >Se,;cB'/]
{ [:V$y1
CDialog::DoDataExchange(pDX); %UM
*79
//{{AFX_DATA_MAP(CAboutDlg) 8X0z~&
//}}AFX_DATA_MAP 5PW^j\G-f
} rGkyGz8>
c)tfAD(N8x
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \Roz$t-R|f
//{{AFX_MSG_MAP(CAboutDlg) <,(,jU)j
// No message handlers KYP!Rs/j.
//}}AFX_MSG_MAP d %#b:(,
END_MESSAGE_MAP() c(%|: P^
p:%loDk
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .~}1+\~5
: CDialog(CCaptureDlg::IDD, pParent) 'RRE|L,
{ }75e:w[
//{{AFX_DATA_INIT(CCaptureDlg) =2 kG%9
m_bControl = FALSE; JCaOK2XT;
m_bAlt = FALSE; W%)Y#C
m_bShift = FALSE; 9/7u*>:
m_Path = _T("c:\\"); cAc@n6[`3
m_Number = _T("0 picture captured."); n(|^SH4$b
nCount=0; %IRi1EmN8
bRegistered=FALSE; 6&-(&(_
bTray=FALSE; HmwT~
//}}AFX_DATA_INIT m6djeOl
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Wm3X[?V
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9,tej
} km40qO@3
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void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }{"fJ3] c^
{ 4e1Y/
Xq`
CDialog::DoDataExchange(pDX); ]fD}
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//{{AFX_DATA_MAP(CCaptureDlg) '7@R7w!E4H
DDX_Control(pDX, IDC_KEY, m_Key); :eg4z )
DDX_Check(pDX, IDC_CONTROL, m_bControl); Lk$B{2^n
DDX_Check(pDX, IDC_ALT, m_bAlt); Z<4AL\l 98
DDX_Check(pDX, IDC_SHIFT, m_bShift); j+(I"h3
DDX_Text(pDX, IDC_PATH, m_Path); _~
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DDX_Text(pDX, IDC_NUMBER, m_Number); O<\@~U
//}}AFX_DATA_MAP j)GtEP<n#
} BSMwdr
Yuc> fFA
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) c=+!>Z&i$G
//{{AFX_MSG_MAP(CCaptureDlg) 'ah[(F<*@e
ON_WM_SYSCOMMAND() \G3rX9xG
ON_WM_PAINT() ""D 4s
ON_WM_QUERYDRAGICON() F/A|(AH'
ON_BN_CLICKED(ID_ABOUT, OnAbout) d M-%{
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9E6R0D}
ON_BN_CLICKED(ID_CHANGE, OnChange) 4{l,
//}}AFX_MSG_MAP 3t6LT
END_MESSAGE_MAP() T5:G$-qL(
l \?c}7k
BOOL CCaptureDlg::OnInitDialog() [h:T*(R?
{ ]d%8k}U
CDialog::OnInitDialog(); eN~=*Mn(za
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 69 o7EA
ASSERT(IDM_ABOUTBOX < 0xF000); .}`Ix'.
CMenu* pSysMenu = GetSystemMenu(FALSE); 6(e>P)
if (pSysMenu != NULL) :\}(&
>
{ 2[;_d;oB @
CString strAboutMenu; ->{KVPHe{
strAboutMenu.LoadString(IDS_ABOUTBOX); +H2-ZXr
if (!strAboutMenu.IsEmpty()) 3Le{\}-$.
{ XGMiW0j0B
pSysMenu->AppendMenu(MF_SEPARATOR); IkXx# )
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {u9}bx'<
} D1mfm.9_r^
} 2T TdH)
SetIcon(m_hIcon, TRUE); // Set big icon GDy9qUV
SetIcon(m_hIcon, FALSE); // Set small icon gGS=cdlV
m_Key.SetCurSel(0); Rx|;=-8zg
RegisterHotkey();
*cnNuT
CMenu* pMenu=GetSystemMenu(FALSE); {91nL'-'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Zsh9>]ML
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Pco'l#:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v 6Vcjm
return TRUE; // return TRUE unless you set the focus to a control v]c6R-U
} /^|Dbx!u
n\.V qe
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) LYg-
.~<I
{ HX{`VahE
if ((nID & 0xFFF0) == IDM_ABOUTBOX) w8D"CwS1Rx
{ XF_pN[}
CAboutDlg dlgAbout; lUiL\~Gq
dlgAbout.DoModal(); /[>sf[X\I9
} T${Q.zHY[!
else 50C
{ ]]juN
CDialog::OnSysCommand(nID, lParam); @Pzu^
} E=w1=,/y
} "v4B5:bmqW
5Zva:
void CCaptureDlg::OnPaint() .eP.&
{ g|Fn7]G
if (IsIconic()) HgkC~'
{ E`k@{*Hn&
CPaintDC dc(this); // device context for painting qWKAM@
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]P2"[y
// Center icon in client rectangle $"&{aa
int cxIcon = GetSystemMetrics(SM_CXICON); [=]4-q6UN
int cyIcon = GetSystemMetrics(SM_CYICON); M[112%[+4
CRect rect; ohGfp9H
GetClientRect(&rect); ?8Cq{
int x = (rect.Width() - cxIcon + 1) / 2; k,F6Tx
int y = (rect.Height() - cyIcon + 1) / 2; xpx\=iAe
// Draw the icon \K<QmK
dc.DrawIcon(x, y, m_hIcon); a+T.^koY
} K>l~SDcZ3
else 78H'ax9m
{ AlW66YAuQ
CDialog::OnPaint(); kd$D 3S^{
} az|N-?u
} Oh\<VvZuN
A7hVHxNJ-
HCURSOR CCaptureDlg::OnQueryDragIcon() p`#R<K
{ q,U+qt
return (HCURSOR) m_hIcon; f!
.<$ih
} _aMPa+D=P
^_5r<{7/ :
void CCaptureDlg::OnCancel() gH3vk $WS
{ {LQ#y/H?
if(bTray) y[_Q-
DeleteIcon(); _8)*]-
CDialog::OnCancel(); ,tJ"
5O3-
}
{ Z5nGG
'W,jMju
void CCaptureDlg::OnAbout() 1&(V
{ ;x1PS
CAboutDlg dlg; ; XN{x
dlg.DoModal(); 4^OY
C
} %lGfAYEM=
p >t#@Eu|
void CCaptureDlg::OnBrowse() JNUt$h
{ zeC
RK+-
CString str; u4%Pca9(=
BROWSEINFO bi; 6ez<g
Uf
char name[MAX_PATH]; M$8^91%4B
ZeroMemory(&bi,sizeof(BROWSEINFO)); o W Nh@C
bi.hwndOwner=GetSafeHwnd(); tWa)_y
bi.pszDisplayName=name; :s6o"VkW
bi.lpszTitle="Select folder"; X~,aNRy
bi.ulFlags=BIF_RETURNONLYFSDIRS; _v=SH$O+
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q=20IQp
if(idl==NULL) z4]api(xZ
return; jc f #6
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zb<6
Ov
str.ReleaseBuffer(); q,eVjtF
m_Path=str; BV upDGh3
if(str.GetAt(str.GetLength()-1)!='\\') !*. -`$x
m_Path+="\\"; V2|aN<Sx<
UpdateData(FALSE); [ $n_6
} ?+a,m# Yx
!|S43i&p
void CCaptureDlg::SaveBmp() VsE9H]v
{ sCb=5uI
CDC dc; =k0_eX0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~-J]W-n
CBitmap bm; >R!jB]5
int Width=GetSystemMetrics(SM_CXSCREEN); 1sdLDw_)p
int Height=GetSystemMetrics(SM_CYSCREEN);
|CZ@te)>
bm.CreateCompatibleBitmap(&dc,Width,Height); r_6ZO&
CDC tdc; Mz~D#6=
tdc.CreateCompatibleDC(&dc); 6U,O*WJ%e
CBitmap*pOld=tdc.SelectObject(&bm); dl@%`E48w
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ouFYvtF g
tdc.SelectObject(pOld); l
+OFw)8od
BITMAP btm; u=7J/!H7^
bm.GetBitmap(&btm); 7.#F,Ue_0T
DWORD size=btm.bmWidthBytes*btm.bmHeight; R1GEh&U{
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4X
|(5q?
BITMAPINFOHEADER bih; | Aw%zw1@
bih.biBitCount=btm.bmBitsPixel; iv;Is[<o
bih.biClrImportant=0; M`i\VG
bih.biClrUsed=0; {I #]@,
bih.biCompression=0; \EtQ5T*u
bih.biHeight=btm.bmHeight; a^zibPG
bih.biPlanes=1; c%G{#}^2
bih.biSize=sizeof(BITMAPINFOHEADER); $$5aUI:$~$
bih.biSizeImage=size; c>Xs&_
bih.biWidth=btm.bmWidth; QY?~ZwYB
bih.biXPelsPerMeter=0; j; y#[|
bih.biYPelsPerMeter=0; !F1N~6f
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); UsQ+`\|
static int filecount=0; ;J2z p*|
CString name; 5}]"OXQ
name.Format("pict%04d.bmp",filecount++); v,{yU\)
name=m_Path+name; Ww%=1M]e-
BITMAPFILEHEADER bfh; kep/+J-u
bfh.bfReserved1=bfh.bfReserved2=0; OAkZKG|
bfh.bfType=((WORD)('M'<< 8)|'B'); ~h85BF5
bfh.bfSize=54+size; g8xQ|px
bfh.bfOffBits=54; =U|.^5sa#
CFile bf; VAf1 " )pC
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y
M\ K%rk
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); z hRB,1iG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); z'\_jaj^
bf.WriteHuge(lpData,size); Slher0.Y
bf.Close(); \BZhf?9U
nCount++; SY^t} A7:/
} b+6\JE^Mz
GlobalFreePtr(lpData); A
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if(nCount==1) DYxCQ
D
m_Number.Format("%d picture captured.",nCount); _FVcx7l!u
else v+`N*\J_
m_Number.Format("%d pictures captured.",nCount); pDIVZC
UpdateData(FALSE); u TK,&
} uPG4V2
2fR02={-
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2Mmz %S'd
{ YSh+pr
if(pMsg -> message == WM_KEYDOWN) s,=i_gyPQ
{ orfO^;qTY
if(pMsg -> wParam == VK_ESCAPE) /!$c/QZ
return TRUE; U4-g^S[
if(pMsg -> wParam == VK_RETURN) ZUR6n>r
return TRUE; 4?7W+/~<&
} ytoo~n
return CDialog::PreTranslateMessage(pMsg); /ZPyN<@
} `~Zs0
QQ ~-
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @&:ar
{ DV-;4AxxRq
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0#&5.Gr)
SaveBmp();
B$!)YD;
return FALSE; V'T ,4
} 7=WT69,&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -}=%/|\FG
CMenu pop; ,:H\E|XeBw
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); FUOI3
CMenu*pMenu=pop.GetSubMenu(0); b6F4>@gjg
pMenu->SetDefaultItem(ID_EXITICON); %$Z7x\_
CPoint pt; T'&I{L33Y
GetCursorPos(&pt); @zz1hU
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r1LViK
if(id==ID_EXITICON) $!(pF
DeleteIcon(); Jjv=u
else if(id==ID_EXIT) M|qteo
OnCancel(); 7:3$Ey
return FALSE; Z2='o_c
} O0No'LVu
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xp72>*_9&
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) %.
,=maA
AddIcon(); mfo1+owT
return res; y_IM@)1H~
} yo)%J
;z:UN}
void CCaptureDlg::AddIcon() \":m!K;Z
{ &8_gRP
NOTIFYICONDATA data; G *;a^]-
data.cbSize=sizeof(NOTIFYICONDATA); 1ilBz9x*!
CString tip; ;Q[mL(1:
tip.LoadString(IDS_ICONTIP); Upd3-2kr&J
data.hIcon=GetIcon(0); z3M6V}s4
data.hWnd=GetSafeHwnd(); w1"nffhO
strcpy(data.szTip,tip); 8C~]yd
data.uCallbackMessage=IDM_SHELL; xA$nsZ]
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l0cA6b
data.uID=98; ~-m "
Shell_NotifyIcon(NIM_ADD,&data); \z7SkZt,GT
ShowWindow(SW_HIDE); fCtPu08{Z
bTray=TRUE; <-S%kA8
} a@* S+3
";Rtiiu
void CCaptureDlg::DeleteIcon() $8[r9L!
{ !PJ 6%"
NOTIFYICONDATA data; 78OIUNm`
data.cbSize=sizeof(NOTIFYICONDATA); x{c/$+Z[
data.hWnd=GetSafeHwnd(); <l9-;2L4
data.uID=98; !\L/[:n
Shell_NotifyIcon(NIM_DELETE,&data); +g]yA3
ShowWindow(SW_SHOW); ugx%_x6
SetForegroundWindow(); fUQ6Z,9
ShowWindow(SW_SHOWNORMAL);
S"$m]
bTray=FALSE; yH*6@P4:0=
} Y=n4K<
,|plWIl~
void CCaptureDlg::OnChange() .?e\I`Kk^'
{ x,S
P'fcP
RegisterHotkey(); k]HEhY
} g[7#w,o
Gz[fG
BOOL CCaptureDlg::RegisterHotkey() G\Ro}5TO
{ Bw64
UpdateData(); H0SQ"?
UCHAR mask=0; ? Cg>h
UCHAR key=0; pL%r,Y_^\x
if(m_bControl) ]Ww?QhJ
mask|=4; tl'9IGlc
if(m_bAlt) IGFR4+
mask|=2; Gkv{~?95
if(m_bShift) ~Oq +IA~9
mask|=1; X>.
NFB
key=Key_Table[m_Key.GetCurSel()]; JEgx@};O
if(bRegistered){ B7<Kc
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ch%m
bRegistered=FALSE; -O!Zxg5x
} y>|{YWbp?
cMask=mask;
\qR %%S
cKey=key; adi[-L#
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r~n sN*t
return bRegistered; VZ](uF BY
} {Gw.l."
@%lBrM
四、小结 zyg
}F
e^Ky<*Y
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。