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:
8U8"k
,og@}gOMB
一、实现方法
[<%yU y v/^2K,[0> 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:
ou(9Qf zN w,l1&=d #pragma data_seg("shareddata")
J>+Dv?Ni$ HHOOK hHook =NULL; //钩子句柄
eF2<L [9 UINT nHookCount =0; //挂接的程序数目
+J^}"dG static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
"+rX*~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
P_qxw-s static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
?W#! S static int KeyCount =0;
_h.[I8xgYG static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
C ]#R7G #pragma data_seg()
p%G\5.GcJL <:ZN 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。
$GYy[-.` JL*-L*|Zcl DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
8gx^e./ 7?kvrIuY& BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ikY=} cKey,UCHAR cMask)
qV(Plt% {
lh5k@\X BOOL bAdded=FALSE;
?!
kup for(int index=0;index<MAX_KEY;index++){
FUHjY if(hCallWnd[index]==0){
+\{!jB*g hCallWnd[index]=hWnd;
*{tJ3<t(1 HotKey[index]=cKey;
Cd(Ov5% HotKeyMask[index]=cMask;
-nU_eDy bAdded=TRUE;
)kd PAw KeyCount++;
a
@TAUJ, break;
bhg"<I }
hup]Jk }
%i^%D return bAdded;
7gJ`G@y }
!Hgq7vZG //删除热键
"PlM{ZI\ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
K7y}R%QF {
Y[pGaiN: BOOL bRemoved=FALSE;
lk+)-J-lj' for(int index=0;index<MAX_KEY;index++){
2
OGg`1XX if(hCallWnd[index]==hWnd){
TX 12$p\ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Qs4Jl ;Y _ hCallWnd[index]=NULL;
,;{mH]"s HotKey[index]=0;
m6JIq}CMb HotKeyMask[index]=0;
cOS|B1xG bRemoved=TRUE;
bbnAF*7s8 KeyCount--;
*ZY{^f break;
B]kz3FF }
L1aN"KGMF }
H p1cVs }
&\5T`|~)! return bRemoved;
wCkkfTO }
8_ju.h[ Q PGssQR6 zf^!Zqn[8z DLL中的钩子函数如下:
Gd"lB*^Ht O/Da8#S< LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
}G-qOt {
%Uuhi&PA-l BOOL bProcessed=FALSE;
lMlXK4- if(HC_ACTION==nCode)
\24neD4cM@ {
{U&Mo97rzX if((lParam&0xc0000000)==0xc0000000){// 有键松开
:egSW2"5S switch(wParam)
[=XsI]B\ {
koaH31Q case VK_MENU:
]1gt|M^ MaskBits&=~ALTBIT;
Fnr*.k break;
VP|9Cm=Fg case VK_CONTROL:
0;V2>! MaskBits&=~CTRLBIT;
Th@L68 break;
;)UZT^f`)K case VK_SHIFT:
3``$yWWg MaskBits&=~SHIFTBIT;
RN!oflb break;
rMLCtGi default: //judge the key and send message
=TyN"0@ break;
377$c;4F }
h/PWi<R
i for(int index=0;index<MAX_KEY;index++){
$(C71M|CT if(hCallWnd[index]==NULL)
TN` pai0 continue;
^${-^w@,%V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V18w {
?^k-)V SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Cm>8r5LG bProcessed=TRUE;
ou@Dd4 }
&W }ooGg }
q}(UC1| }
A2F+$N else if((lParam&0xc000ffff)==1){ //有键按下
]xV7)/b5G switch(wParam)
!*EHr09N7 {
!)
LMn case VK_MENU:
j2tw`*S+ MaskBits|=ALTBIT;
.wYx_ break;
5GC{)#4 case VK_CONTROL:
]Kil/Y MaskBits|=CTRLBIT;
>|H=25N>; break;
7nfQ=?XNK case VK_SHIFT:
R (4 :_ xc MaskBits|=SHIFTBIT;
|jc87(x< break;
03_tt7 default: //judge the key and send message
Z#MPlw0B break;
u'LA%l- }
4z?6[Cg< for(int index=0;index<MAX_KEY;index++){
q'{E $V)E if(hCallWnd[index]==NULL)
!!dNp5h` continue;
p4|:u[:& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P4ot,Q4 {
bV`Zo(z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
aCy2.Qn bProcessed=TRUE;
8`9!ocrM }
Z}$.Tm }
sR'rY[^/| }
3| g'1X} if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
x~A""*B~ for(int index=0;index<MAX_KEY;index++){
&c?-z}=G if(hCallWnd[index]==NULL)
|L<oKMZY continue;
% e:VeP~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
GfPe0&h SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
R&=Y7MfZ //lParam的意义可看MSDN中WM_KEYDOWN部分
qvhTc6oH }
`{8Sr) }
cfa#a!Y4 }
F(}d|z@@
return CallNextHookEx( hHook, nCode, wParam, lParam );
2}'&38wMT }
2t/ba3Rfk a'XCT@B 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:
4?1Ac7bE !Kd/
lDY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
XR]]g+Z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
XOVZ'V pA"pt~6 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:
Q->'e-\E<" noGMfZ1 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
4- N># {
)6^b\` if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
#](ML:! {
k;l^wM //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
9F ).i SaveBmp();
:.DCRs$Q return FALSE;
9O~1o?ni }
hFs0qPVY …… //其它处理及默认处理
: :e=6i }
>c8zMd Ed.~9*m Et# }XVCJ 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。
GcHWalm 2m/1:5 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。
w~&bpCB! !A&Vg # 二、编程步骤
wF$8#= wC..LdSR 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
eNi.d;8F q yQPR 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
H /*^$>0Uo bXC;6xZV 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;
]%"Z[R FzFY2h;n]B 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;
2p(K0PtX 8!S="_ 5、 添加代码,编译运行程序。
(E\7Ui0Q N;;!ObVHnP 三、程序代码
}NiJDs u
L/*,[}' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
QJvA #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
.#lQZo6$\| #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
SI8mr`gJ #if _MSC_VER > 1000
!@p@u;djJ #pragma once
4$1sBY/ #endif // _MSC_VER > 1000
f)?s.DvUB #ifndef __AFXWIN_H__
xa5I{<<U #error include 'stdafx.h' before including this file for PCH
Jg/WE1p> #endif
fW <qp #include "resource.h" // main symbols
.lOEQLt class CHookApp : public CWinApp
6 @'v6 1' {
.' 3;Z'%"g public:
s{Ryh.IyI CHookApp();
i[T!{< // Overrides
+c+#InsY // ClassWizard generated virtual function overrides
QU8?/ //{{AFX_VIRTUAL(CHookApp)
cuW$%$F public:
,.x1+9X virtual BOOL InitInstance();
!!DHfAV] virtual int ExitInstance();
:&9#p%/ //}}AFX_VIRTUAL
.
p<*n6E //{{AFX_MSG(CHookApp)
P0 hC4Sxf // NOTE - the ClassWizard will add and remove member functions here.
`~VV1 // DO NOT EDIT what you see in these blocks of generated code !
WSW aq\9]8 //}}AFX_MSG
FgKDk!ci DECLARE_MESSAGE_MAP()
gX.4I; };
v>;6pcp[F LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
C[|jJ9VE, BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Aum&U){yY BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
NIQNzq?a^ BOOL InitHotkey();
q: ?6 BOOL UnInit();
|r%6;8A]i #endif
9p9:nx\ Xj.6A,}^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
HT[<~c #include "stdafx.h"
G\=7d%T+ #include "hook.h"
r@/+ #include <windowsx.h>
Ip|~j}
} #ifdef _DEBUG
l)4KX{Rz{A #define new DEBUG_NEW
PL%U #undef THIS_FILE
3.xsCcmP static char THIS_FILE[] = __FILE__;
[59_n{S 1 #endif
d+\o>x|Y!Y #define MAX_KEY 100
L|u\3.: #define CTRLBIT 0x04
a>ZV'~zTf #define ALTBIT 0x02
"6FZX~]s! #define SHIFTBIT 0x01
~]O~a}]g( #pragma data_seg("shareddata")
5,Mc`IIK1 HHOOK hHook =NULL;
j[F\f> UINT nHookCount =0;
J)"2^?!&B static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
;vy" i static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
6`J*{%mP static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
|'aGj static int KeyCount =0;
;w a-\Z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
iT227v!s #pragma data_seg()
9i;%(b{ HINSTANCE hins;
B8:G1r5G/ void VerifyWindow();
zgI!S6q BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
|k\4\aLj //{{AFX_MSG_MAP(CHookApp)
O&RW[ml*3 // NOTE - the ClassWizard will add and remove mapping macros here.
'=Nb`n3% // DO NOT EDIT what you see in these blocks of generated code!
|A0BYzlVc //}}AFX_MSG_MAP
FAX|.!US*p END_MESSAGE_MAP()
KLBU8% #^|y0:
CHookApp::CHookApp()
NTbmI$( {
>-*rtiE // TODO: add construction code here,
.!e):&(8 // Place all significant initialization in InitInstance
>E;kM
B }
IW?).%F ^a^bsKW CHookApp theApp;
c@7d4Jz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
SR!EQ< {
* ?x$q/a BOOL bProcessed=FALSE;
qIS9.AL if(HC_ACTION==nCode)
j)xRzImu {
#I8)|p?P if((lParam&0xc0000000)==0xc0000000){// Key up
VHyH't_&s switch(wParam)
b
5<&hN4g {
JZI)jIh case VK_MENU:
P{fT5K| MaskBits&=~ALTBIT;
uatY:GSR break;
1yC_/Va1 case VK_CONTROL:
o@:${>jw MaskBits&=~CTRLBIT;
MdXOH$ps break;
>9dzl# case VK_SHIFT:
bi/ AQ^ MaskBits&=~SHIFTBIT;
7>.d*?eao\ break;
`(tVwX4 default: //judge the key and send message
K|L&mL&8 break;
&pHSX }
Znr6,[U+q for(int index=0;index<MAX_KEY;index++){
X1*f#3cm# if(hCallWnd[index]==NULL)
k_;g-r, continue;
lCafsIB if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)qSjI_qt5 {
gy5 ^JL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
1Hl-|n bProcessed=TRUE;
zUuOX5-6x }
j<NZ4Rf }
|\.:h":!0~ }
w#6)XR|+,. else if((lParam&0xc000ffff)==1){ //Key down
nA*Udrcn switch(wParam)
ej91)3AO {
6v"WI@b4 case VK_MENU:
8c`EB-y MaskBits|=ALTBIT;
Xwp6]lx break;
&u`EYxT case VK_CONTROL:
[>$?/DM MaskBits|=CTRLBIT;
'p FK+j break;
>\br8=R case VK_SHIFT:
P2Jo^WS MaskBits|=SHIFTBIT;
a =
*' break;
&x?m5%^l default: //judge the key and send message
knn9s0'Q break;
m!5MGq~ }
d`gKF for(int index=0;index<MAX_KEY;index++)
_C@A>]GT {
r01u3! if(hCallWnd[index]==NULL)
uG7?:) pxv continue;
lvAKL>qX if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oRo[WQla {
F/SYmNp SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
T)MX]T bProcessed=TRUE;
M!YGv
}
Pm7lP5 }
T mK[^ }
s%QCdU ] if(!bProcessed){
G%A!yV for(int index=0;index<MAX_KEY;index++){
M3U?\g if(hCallWnd[index]==NULL)
.],:pL9d continue;
D&o~4Qvc] if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
l(Ya,/4 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
A]laS7Q }
o2D;EUsNX }
e:l7 w3?O }
I`77[ return CallNextHookEx( hHook, nCode, wParam, lParam );
C{:U<q }
Tn"@u&P
* :qc?FQ
; BOOL InitHotkey()
IyEfisOK? {
m*wDJEKo if(hHook!=NULL){
B)*1[Jf{4 nHookCount++;
63(XCO return TRUE;
0GW69 z }
:N!s@6 else
'rNLh3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]u^ybW" if(hHook!=NULL)
SP\s{,'F-b nHookCount++;
Fh/psd return (hHook!=NULL);
@QMU$]&i] }
O1@3V/.Wu BOOL UnInit()
e(?1`1 {
n%;4Fm? if(nHookCount>1){
#
0d7 nHookCount--;
EERCb%M8Z return TRUE;
~|[i64V<^ }
U'^ G-@ BOOL unhooked = UnhookWindowsHookEx(hHook);
.}GOHW)} if(unhooked==TRUE){
B8unF=u nHookCount=0;
g[' 7 $ hHook=NULL;
2%v6h }
uaYI3w@^ return unhooked;
beBv|kI4 }
V["'eJA,, qC=9m[MI BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
b'C#]DorE {
/eT9W[a BOOL bAdded=FALSE;
Lxn-M5RPQ for(int index=0;index<MAX_KEY;index++){
A#{I-*D[ if(hCallWnd[index]==0){
-aLM*nIoe hCallWnd[index]=hWnd;
vM-kk:n7f HotKey[index]=cKey;
LN)yQ- HotKeyMask[index]=cMask;
#S]O|$&* bAdded=TRUE;
0$NzRPbH KeyCount++;
f'MRC
\ break;
MR: H3 }
;dtA-EfOZ }
JvEW0-B^l, return bAdded;
g6xQQ,q=l }
RameaFX8 R5mb4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(#x&Y#5 {
V)4?y9xZv BOOL bRemoved=FALSE;
V3 T.EW for(int index=0;index<MAX_KEY;index++){
*NM* if(hCallWnd[index]==hWnd){
N"0>)tG if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=(~*8hJ hCallWnd[index]=NULL;
M04u>|
, HotKey[index]=0;
APJFy@l} HotKeyMask[index]=0;
c,]fw2 bRemoved=TRUE;
%{UW!/ KeyCount--;
|MN2v[y break;
1vAJ(O{- }
+;)Xu}
}
RH$l?j6 }
.g7\+aiTUd return bRemoved;
T!pA$eE }
ug'^$geM &h.?~Ri void VerifyWindow()
qVO,sKQ{ {
Ji1# >;& for(int i=0;i<MAX_KEY;i++){
xX0wn?,~ if(hCallWnd
!=NULL){ EY.m,@{
if(!IsWindow(hCallWnd)){ D(Q]ddUi'
hCallWnd=NULL;
|eFaOL|
HotKey=0; +.rE|)BPy
HotKeyMask=0; LF)wn-C}
KeyCount--; }7K~-
} &T ^bv*P
} knfmJUT
} bPkz= ^-
} bA'N2~.,
'#oH1$W]
BOOL CHookApp::InitInstance() KdzV^6K<c
{ %h;1}SFl0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ($8!r|g5#
hins=AfxGetInstanceHandle(); epG =)gd=8
InitHotkey(); Z.rhM[*+0C
return CWinApp::InitInstance(); b2j~"9
} ,Ij/
^EC}
fQ-IM/z
int CHookApp::ExitInstance() Uc
; S@
{ *o!#5c
VerifyWindow(); 7j(gW
UnInit(); RMid}BRE
return CWinApp::ExitInstance(); e?
|4O<@
} JW=q'ibR
cK\?wZ| Y
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file J$T(p%
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _Kh8
<$h
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Jp_ :.4
#if _MSC_VER > 1000 0,8RA_Ca}
#pragma once .ezZ+@LI+#
#endif // _MSC_VER > 1000 hvA|d=R(
~jz51[{v
class CCaptureDlg : public CDialog Id>I.e4
{ <^942y-=
// Construction )YZx]6\l)
public: 5)0'$Xxqa0
BOOL bTray; r]aI=w<(f
BOOL bRegistered; }}"|(2I
BOOL RegisterHotkey(); THgEHR0,}[
UCHAR cKey; sWKdqs
UCHAR cMask; vfc,{F=Q
void DeleteIcon(); LW9F%?e!>
void AddIcon(); $U)nrni
UINT nCount; i.KRw6
void SaveBmp(); HXPq+
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [8Z
!dj
// Dialog Data .&8a ;Q?c
//{{AFX_DATA(CCaptureDlg) L!`PM.:9
enum { IDD = IDD_CAPTURE_DIALOG }; hrXk 7}9
CComboBox m_Key; 5ci1ce
BOOL m_bControl; ,# %I$
BOOL m_bAlt; \6aisK
BOOL m_bShift; 9;L8%T
(
CString m_Path; M~+DxnJ=
CString m_Number; $H&:R&Us
//}}AFX_DATA NK:! U
// ClassWizard generated virtual function overrides [N<rPHT
//{{AFX_VIRTUAL(CCaptureDlg) 7*He 8G[W
public: 8==_43
virtual BOOL PreTranslateMessage(MSG* pMsg); rfr]bq5
protected: o1-_BlZ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LyL(~Jc|
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (Ap?ixrR_
//}}AFX_VIRTUAL aY6F4,7/B
// Implementation >&^jKfY
protected: 2@I0p\a
HICON m_hIcon; N:Ir63X*#
// Generated message map functions 3UUN@Tx
//{{AFX_MSG(CCaptureDlg) EG3u)}vI
virtual BOOL OnInitDialog(); bL+}n8B
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wti
afx_msg void OnPaint(); vcaPd}nf
afx_msg HCURSOR OnQueryDragIcon(); P>03 DkbB
virtual void OnCancel(); n9R0f9:*
afx_msg void OnAbout(); /!`xqG#
afx_msg void OnBrowse(); ud"Kko Rt
afx_msg void OnChange(); Ka<J*
k3
//}}AFX_MSG fVdu9 l
DECLARE_MESSAGE_MAP() Yb1Q6[!
}; @rF|WT
#endif X}g3[
!/=.~B
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file r\)bN4-g
#include "stdafx.h" LC\U6J't1
#include "Capture.h" Ds#BfP7a
#include "CaptureDlg.h" i4XiwjCHN
#include <windowsx.h> c%1{l]
#pragma comment(lib,"hook.lib") i6g=fx6j*
#ifdef _DEBUG ?/myG{E
#define new DEBUG_NEW *kEzGgTzoS
#undef THIS_FILE ExeZj8U
static char THIS_FILE[] = __FILE__; H8 xhE~'t
#endif `PSjkF(
#define IDM_SHELL WM_USER+1 sz%_9;`dpL
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 14 (sp
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &So1;RR,_M
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *N"CV={No
class CAboutDlg : public CDialog |68k9rq
{ ia_lP
public: IDL0!cF
CAboutDlg(); 3rjKwh7
// Dialog Data ,Q0H)//~
//{{AFX_DATA(CAboutDlg) `*U$pg
enum { IDD = IDD_ABOUTBOX }; <Y2$'ETD
//}}AFX_DATA W|y;Kxy
// ClassWizard generated virtual function overrides 5pK
_-:?
//{{AFX_VIRTUAL(CAboutDlg) 0G0(g,3p
protected:
NRgVNE
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NFKvgd@
//}}AFX_VIRTUAL ;47z.i&T
// Implementation J0oeCb
protected: +-,iC6kK
//{{AFX_MSG(CAboutDlg) Vjw u:M
//}}AFX_MSG JbQY{z!
DECLARE_MESSAGE_MAP() iq[IZdza
}; c*(^:#"9
, 2xv
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?_cOU@n
{ 8/&4l,M5
//{{AFX_DATA_INIT(CAboutDlg) 4 Tw~4b
//}}AFX_DATA_INIT N_Kdi%q
} L(sT/
]5Dh<QY&.
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R=F_U
{ 4d-(:
CDialog::DoDataExchange(pDX); |"I)1[7
//{{AFX_DATA_MAP(CAboutDlg) y@It#!u0
//}}AFX_DATA_MAP Am_>x8z
} 6bLn8UT
rNTLP
m
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) XM,slQ
//{{AFX_MSG_MAP(CAboutDlg) aWJj@',_
// No message handlers w,$qsmR
//}}AFX_MSG_MAP x!\q69nd v
END_MESSAGE_MAP() "WUS?Q
%^vT7c>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $LFL4Q
: CDialog(CCaptureDlg::IDD, pParent) u+KZ. n/
{ BP0:<vK{
//{{AFX_DATA_INIT(CCaptureDlg) 2\QsF,@`YU
m_bControl = FALSE; c38XM]Jeq
m_bAlt = FALSE; 'A3skznX{
m_bShift = FALSE; sA77*T
m_Path = _T("c:\\");
2wHbhW[
m_Number = _T("0 picture captured."); +E_yEH7_)
nCount=0; ,^97Ks
;
bRegistered=FALSE; %S}uCqcAK
bTray=FALSE; i>s
//}}AFX_DATA_INIT 7-!n-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oSC'b%
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W>)0=8#\
} \'4~@
p2{7+m
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) h0@a"DqK
{ %dFJ'[jDL
CDialog::DoDataExchange(pDX); hN
&?x5aC>
//{{AFX_DATA_MAP(CCaptureDlg) G~YZ(+V%~
DDX_Control(pDX, IDC_KEY, m_Key); HdJ g
DDX_Check(pDX, IDC_CONTROL, m_bControl); UI+6\ 3
DDX_Check(pDX, IDC_ALT, m_bAlt); =I@t%Y
DDX_Check(pDX, IDC_SHIFT, m_bShift); "+-
'o+
DDX_Text(pDX, IDC_PATH, m_Path); !}#> ky!t
DDX_Text(pDX, IDC_NUMBER, m_Number); dD=$$(
je
//}}AFX_DATA_MAP 49$<:{ ~
} {;c'@U
_9
]:0bDUo
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Y \-W`
//{{AFX_MSG_MAP(CCaptureDlg) 2Jd(@DcJ2C
ON_WM_SYSCOMMAND() u ;-&r'J>
ON_WM_PAINT() +*]$PVAFA
ON_WM_QUERYDRAGICON() iM)K:L7d
ON_BN_CLICKED(ID_ABOUT, OnAbout) :_~.Nt
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) QLWnP-
ON_BN_CLICKED(ID_CHANGE, OnChange) pg4W?N`
//}}AFX_MSG_MAP %
/VCjuV
END_MESSAGE_MAP() &uK(. @
6*q1%rs:w
BOOL CCaptureDlg::OnInitDialog() ^{4BcM7eH
{ ~v.mbh
CDialog::OnInitDialog(); vSH,fS-n
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q'/sP 5Pj
ASSERT(IDM_ABOUTBOX < 0xF000); d+D~NA[M
CMenu* pSysMenu = GetSystemMenu(FALSE); HcsVq+
if (pSysMenu != NULL) j|k/&q[St
{ s)a-ky(
CString strAboutMenu; 6]?mjG6
strAboutMenu.LoadString(IDS_ABOUTBOX); 3' i6<
if (!strAboutMenu.IsEmpty()) ]P0%S@]
{ &v{#yzM
pSysMenu->AppendMenu(MF_SEPARATOR); #1DEZ4]jjY
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vW1^
} F@i>l{C
} 7__[=)(b2X
SetIcon(m_hIcon, TRUE); // Set big icon YsVmU
SetIcon(m_hIcon, FALSE); // Set small icon ](w)e
p~;3
m_Key.SetCurSel(0); XB7Aa)
RegisterHotkey(); kGYpJg9=
CMenu* pMenu=GetSystemMenu(FALSE); 0Z1ksfLU
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ES~b f
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); u}[ a
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); q!y. cyL
return TRUE; // return TRUE unless you set the focus to a control mgAjD.
} 9\_AB.Z:
/?'~`4!(
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) K ze?@*
{ fp' '+R[
if ((nID & 0xFFF0) == IDM_ABOUTBOX) {aY) Qv}
{ l{{,D57J
CAboutDlg dlgAbout; {dpC;jsW1
dlgAbout.DoModal(); w}xA@JgQ%
} @7twe;07r
else -tj#BEC[H(
{ k$3pmy*
CDialog::OnSysCommand(nID, lParam); JU?;Kq9R
} .9nqJ7]
} IzpE|8l
EZ)b E9
void CCaptureDlg::OnPaint() d`^3fr'.4A
{ 1K#>^!?M
if (IsIconic()) ^wIB;!W
{ nR{<xD^
CPaintDC dc(this); // device context for painting EN!C5/M{&
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); g,Ob/g8uc
// Center icon in client rectangle 4&mY-N7A
int cxIcon = GetSystemMetrics(SM_CXICON); JbPkC*.
int cyIcon = GetSystemMetrics(SM_CYICON); dy&G~F28
CRect rect; ,hn#DJ)
GetClientRect(&rect);
XIInI
int x = (rect.Width() - cxIcon + 1) / 2; z
&EDW5I
int y = (rect.Height() - cyIcon + 1) / 2; &=g3J4$z
// Draw the icon :#YC_
id
dc.DrawIcon(x, y, m_hIcon); *D?=Ts
} 6!\V|
else ywwA,9~
{ |Ea%nghl
CDialog::OnPaint(); Hr?lRaV
} A8'RM F1
} ^Arv6kD,
`MI\/oM@
HCURSOR CCaptureDlg::OnQueryDragIcon() tbS hSbj
{ Cn~VJ,l
g
return (HCURSOR) m_hIcon; J@5iD
} YSP\+ZZ
RE>Q5#|c
void CCaptureDlg::OnCancel() KU|W85ye
{ gi!_Nz
if(bTray) m_)-
DeleteIcon(); wN[lC|1c
CDialog::OnCancel(); &-=~8
} jIs>>
Cqr{Nssu
void CCaptureDlg::OnAbout() cq
I $9
{ 'nTlCYT
CAboutDlg dlg; ^~~Rto)Y
dlg.DoModal(); iB)\*)
} *K/K97
5iA>Z!sP[
void CCaptureDlg::OnBrowse() 50_[hC&C)
{ wH~A>
4*(
CString str; wn[)/*(,$(
BROWSEINFO bi; L$PbC!1
char name[MAX_PATH]; `+,?%W)
ZeroMemory(&bi,sizeof(BROWSEINFO)); L`nW&;w'
bi.hwndOwner=GetSafeHwnd(); 5A0]+)5E8
bi.pszDisplayName=name; >Sc yc-n
bi.lpszTitle="Select folder"; 0AO^d[v
bi.ulFlags=BIF_RETURNONLYFSDIRS; /8l-@P.o
LPITEMIDLIST idl=SHBrowseForFolder(&bi); +=($mcw#[
if(idl==NULL) "'v+*H 3
return; k4q":}M
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @[r[l#4yUi
str.ReleaseBuffer(); \!^=~` X-
m_Path=str; apL$`{>US
if(str.GetAt(str.GetLength()-1)!='\\') aO1^>hy
m_Path+="\\"; =Y2 Rht
UpdateData(FALSE); 4/(#masIL
} eo]nkyYDP
A%D'Z85
-
void CCaptureDlg::SaveBmp() g{N}]_%Uh
{ kY]"3a
CDC dc; /b,>fK^
dc.CreateDC("DISPLAY",NULL,NULL,NULL); m*y&z'e\
CBitmap bm; S`s]zdUTP
int Width=GetSystemMetrics(SM_CXSCREEN); 8eB,$;i
int Height=GetSystemMetrics(SM_CYSCREEN); kkl'D!z2g
bm.CreateCompatibleBitmap(&dc,Width,Height); JBpV'_"]
CDC tdc; $mJv\;t
tdc.CreateCompatibleDC(&dc); 7!J-/#!
CBitmap*pOld=tdc.SelectObject(&bm); Jqxd92 bI
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "1a;);S=*)
tdc.SelectObject(pOld); |ke0G
BITMAP btm; -64lf-<
bm.GetBitmap(&btm); (_pw\zk>
DWORD size=btm.bmWidthBytes*btm.bmHeight; g (w/
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?'k_K:_
BITMAPINFOHEADER bih; n-9xfn0U~#
bih.biBitCount=btm.bmBitsPixel; XM\\Imw
bih.biClrImportant=0; ]aPf-O*
bih.biClrUsed=0; do8[wej<:
bih.biCompression=0; /r7xA}se^
bih.biHeight=btm.bmHeight; ?}Zo~]7E
bih.biPlanes=1; y.Z_\@
bih.biSize=sizeof(BITMAPINFOHEADER); l= {Y[T&
bih.biSizeImage=size; j@4MV^F2c
bih.biWidth=btm.bmWidth; _[[0rn$
bih.biXPelsPerMeter=0; &2W"4SE]6
bih.biYPelsPerMeter=0; V?EX`2S
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mu\1hKq;B
static int filecount=0; f-M:ap(O
CString name; $OZ= L
name.Format("pict%04d.bmp",filecount++); gAqK/9;
name=m_Path+name; 63E6nW M
BITMAPFILEHEADER bfh; $#rkvG_w
bfh.bfReserved1=bfh.bfReserved2=0; qm=U<'b^
bfh.bfType=((WORD)('M'<< 8)|'B'); h3`}{
w
bfh.bfSize=54+size; ,>B11Z}PH
bfh.bfOffBits=54; Z
)c\B
CFile bf; |^1g*fy?
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1m5l((d
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'HWl_M
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); cX9o'e:C
bf.WriteHuge(lpData,size); Tx}Nr^
bf.Close(); JMB#KzvN[
nCount++; XZ%[;[
} icb)JZ1K
GlobalFreePtr(lpData); 4M&$wi
if(nCount==1) a#]V|1*O
m_Number.Format("%d picture captured.",nCount); RI*n]HNgy+
else 5 tKgm /
m_Number.Format("%d pictures captured.",nCount); O|t>.<T?
UpdateData(FALSE); IR${a)
} aL:|Dr3SX
D?dBm
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !H\;X`W|~D
{ 1 iox0
if(pMsg -> message == WM_KEYDOWN) 3@" :&
{ AUD)=a>
if(pMsg -> wParam == VK_ESCAPE) @XJ7ff&
return TRUE; n$2oM5<
if(pMsg -> wParam == VK_RETURN) WK$\#>T
return TRUE; 3VLwY!2:
} ?kR1T0lKkE
return CDialog::PreTranslateMessage(pMsg); NFTv4$5d
} rXW.F'=K6
4w+AOWjd
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aV$kxzEc
{ mo^E8t.
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1'/
[x(/]d
SaveBmp(); 93*d:W8Vr
return FALSE; G_1r&[N3
} {^1O
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {m*lt3$k
CMenu pop; bD{tsxm[9
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); q0}u%Yz
CMenu*pMenu=pop.GetSubMenu(0); =@d#@
pMenu->SetDefaultItem(ID_EXITICON); CcUF)$kz
CPoint pt; ;i[JCNiS\
GetCursorPos(&pt); 2-@)'6"n
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z5xQ
-T`
if(id==ID_EXITICON) DinZZ
DeleteIcon(); &.E/%pQ`
else if(id==ID_EXIT) AO8 #l
YP?
OnCancel(); c>$d!IKCL
return FALSE; ?1L<VL=b
} _GkLspSaU
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f+9eB
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :#g.%&
AddIcon(); (nQm9 M(
return res; LF7 }gQs
^
} l :{q I#Q
:m`D
void CCaptureDlg::AddIcon() t*= nI $
{ >c_fUX={
NOTIFYICONDATA data; oJD]h/fQs
data.cbSize=sizeof(NOTIFYICONDATA); /W .s1N
CString tip; x_~_/&X5
tip.LoadString(IDS_ICONTIP); WOn<JCh]
data.hIcon=GetIcon(0); curYD~7
data.hWnd=GetSafeHwnd(); x'0_lf</#
strcpy(data.szTip,tip); '!A}.wF0
data.uCallbackMessage=IDM_SHELL; {Fwvuk
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; F^/KD<cgK
data.uID=98; ^B1Ft5F`b
Shell_NotifyIcon(NIM_ADD,&data); i!%WEHPe
ShowWindow(SW_HIDE); w)ki<Dudg
bTray=TRUE; ulzX$
} CJk"yW[,|
Dh4Lffy
void CCaptureDlg::DeleteIcon() WSMpX-^e@
{ B9|s`o)!
NOTIFYICONDATA data; 693"Pg8b
data.cbSize=sizeof(NOTIFYICONDATA); 2->Lz
data.hWnd=GetSafeHwnd(); SZT n=\
data.uID=98; p0W<K
Shell_NotifyIcon(NIM_DELETE,&data); ]A }ZaXd
ShowWindow(SW_SHOW); '4M{Xn}@
SetForegroundWindow(); m!KEK\5M?
ShowWindow(SW_SHOWNORMAL); NxF:s,a6
bTray=FALSE; W! $U{=
} |Ogh-<|<
1qR$ Yr\
void CCaptureDlg::OnChange() v)np.j0V7
{ Xps
\+l%i
RegisterHotkey(); YZ<zlU
} qeFaY74S
mn03KF=n]
BOOL CCaptureDlg::RegisterHotkey() K6-)l
isf
{ &Z>??|f
UpdateData(); <pV8
+V)
UCHAR mask=0; x"sbm
UCHAR key=0; ~~|Iw=:
if(m_bControl) O[= L#wi
mask|=4; 8Tg1 >q<
if(m_bAlt) K !ILO
mask|=2; 3Qd/X&P
if(m_bShift) TO]7cC
mask|=1; c$,1j%[)
key=Key_Table[m_Key.GetCurSel()]; p@O Ip
if(bRegistered){ omg#[
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Yr"Of*VNH
bRegistered=FALSE; &[{sA;
} )C"ixZ>2xQ
cMask=mask; $1 B?@~&
cKey=key; 0R? @JC
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); h! uyTgq
return bRegistered; q)9n%- YgP
} 2FaCrc/
bD=H$)
四、小结 *lA+-gkK*
LU;zpXg\
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。