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:
hfg
^z5
uvi&! )x 一、实现方法
g"\JiBb5 )!;20Po 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:
3CPSyF Hxn#vAc #pragma data_seg("shareddata")
gw$?&[wY HHOOK hHook =NULL; //钩子句柄
arvKJmD UINT nHookCount =0; //挂接的程序数目
R:[#OH.c static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
ndw&F'.r static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
>u]9(o7I static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
((M>To_l static int KeyCount =0;
fh`}~ aQ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
z
G`|) #pragma data_seg()
V`G^Jyj G[n;%c~`+ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
bk]g}s f/"IC;<~t> DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
\y+^r|IL O^_CqT% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
j} w cKey,UCHAR cMask)
^FZ9q {
+^%)QH>9 BOOL bAdded=FALSE;
KL"_h`UW for(int index=0;index<MAX_KEY;index++){
6q,CEm if(hCallWnd[index]==0){
(px3o'ls h hCallWnd[index]=hWnd;
^2i$AM1t HotKey[index]=cKey;
g'2}Y5m$` HotKeyMask[index]=cMask;
@.,'A[D!K bAdded=TRUE;
+wZ|g6vMct KeyCount++;
=&~ K;=: break;
n*caP9B }
V(Cxd.u }
|hX\ep return bAdded;
w|4CBll }
4}Lui9 //删除热键
e}(8BF BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,l.+$G {
9%riB/vkrF BOOL bRemoved=FALSE;
S'`RP2P for(int index=0;index<MAX_KEY;index++){
,rOh*ebF if(hCallWnd[index]==hWnd){
Ox@$ } if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
!E,|EdIr hCallWnd[index]=NULL;
7/K'nA HotKey[index]=0;
n*TKzn4E HotKeyMask[index]=0;
~*`wRiUhis bRemoved=TRUE;
O{Q+<fBC9 KeyCount--;
VBW][f break;
3ouo4tf$H. }
_qH]OSo }
olm'_{{
}
<SdOb#2 return bRemoved;
j"+6aD/lv }
:*-O;Yw?S@ !uA'0U?ky c?6(mU\x DLL中的钩子函数如下:
+~7[T/v+n [8vqw(2Tm( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
=FMrVE {
Z7 ++c<|p BOOL bProcessed=FALSE;
b,47
EJ} if(HC_ACTION==nCode)
3TN'1D ei {
Jg$ NYs.xZ if((lParam&0xc0000000)==0xc0000000){// 有键松开
TN/&^/ switch(wParam)
/K;A bE {
M&e=LV case VK_MENU:
21] K7 MaskBits&=~ALTBIT;
i%MR<M break;
DmZ_tuVI case VK_CONTROL:
h]4qJ MaskBits&=~CTRLBIT;
9l,8:%X_ break;
.~a8\6t case VK_SHIFT:
`W7;- MaskBits&=~SHIFTBIT;
(l/i# break;
}a%Wu 7D default: //judge the key and send message
'1zC|:, break;
[=:4^S|M }
N9vNSmm for(int index=0;index<MAX_KEY;index++){
wQM( |@zE} if(hCallWnd[index]==NULL)
)ri'W
<l continue;
$?9u;+jIR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]SN5&S {
K3&k+~$ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
8jiBLZkRf bProcessed=TRUE;
k8cR`5@PK }
5nK|0vv%2 }
89W8cJ$yW }
>n1UK5QD else if((lParam&0xc000ffff)==1){ //有键按下
|=W>4> switch(wParam)
-*2b/=$u {
3Qp6$m case VK_MENU:
c~6ywuq+M` MaskBits|=ALTBIT;
I,V'J|=j break;
bHzZ4i case VK_CONTROL:
"AIS6%, MaskBits|=CTRLBIT;
d8WEsQ+)A break;
&fnfuU$ case VK_SHIFT:
RG/P] MaskBits|=SHIFTBIT;
Z7Nhb{ break;
<!X]$kvG default: //judge the key and send message
V3axwg_ break;
@Q:?, }
#Zn+-Ih for(int index=0;index<MAX_KEY;index++){
.SBN^fq if(hCallWnd[index]==NULL)
MN>U jFA continue;
luz,z(
v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
rNgAzH {
~\zIb/ # SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
QdIoK7J 9 bProcessed=TRUE;
zeH=py[n }
fJi?~[5< }
.o8pC }
sEx\7t K if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
9y)}-TcSpY for(int index=0;index<MAX_KEY;index++){
iT1HbAT] if(hCallWnd[index]==NULL)
5jTA6s9z A continue;
^AO2%09.S if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
xCMuq9zt@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
C+gu'hD //lParam的意义可看MSDN中WM_KEYDOWN部分
1i Q(q\% }
5zt5]zl' }
l_2YPon }
h5))D! return CallNextHookEx( hHook, nCode, wParam, lParam );
+:z%#D }
i^/H>E%u [U{RDX 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
'b_SQ2+A *Oy%($' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
?[lKft
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-AKbXkc~\ o7g6*hJz 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:
?\a';@h ,Nev7X[0 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{1GIiP-U {
"~IGE3{ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
nm<S#i* {
RY*s }f //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
;fv/s]X86I SaveBmp();
=}W)%Hldr. return FALSE;
iEMIzaR }
'RCX6TKBnR …… //其它处理及默认处理
3[To"You }
KYFkO~N zrur-i$N+ n\YWWW[wf 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。
;] #Q! N37#Vs 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。
~|e H8@o 0y#TGM|0D 二、编程步骤
f=40_5a6 J_XbtCmt 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";
f&Meiu+ f/=H#'+8 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
;[-y>qU0 OH~I+=}. 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;
m*TJ@gI*t k12mxR/ 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;
$h'>Zvf GoKMi[b 5、 添加代码,编译运行程序。
?s: 2~Qlu |7G=f9V 三、程序代码
T<ekDhlr ]b@:?DX8 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
(( Wq #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
I44bm?[S #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Ea3 4x #if _MSC_VER > 1000
U^$l$"~" #pragma once
LpSd/_^b #endif // _MSC_VER > 1000
h&?tF~h #ifndef __AFXWIN_H__
SyR[G*djl #error include 'stdafx.h' before including this file for PCH
$RV'DQO #endif
-ID!kZx #include "resource.h" // main symbols
n15lX,FI class CHookApp : public CWinApp
C`C$i>X7^ {
]i:O+t/U public:
&k {1N. CHookApp();
Yy8%vDdJO // Overrides
-o0~xspF // ClassWizard generated virtual function overrides
`]g}M, //{{AFX_VIRTUAL(CHookApp)
affig public:
}^B=f_Ag virtual BOOL InitInstance();
YQ<O.E virtual int ExitInstance();
p\7(IhW@ //}}AFX_VIRTUAL
1rhQ{6 //{{AFX_MSG(CHookApp)
;-T%sRI:| // NOTE - the ClassWizard will add and remove member functions here.
:. a}pgh // DO NOT EDIT what you see in these blocks of generated code !
1:lhZFZ //}}AFX_MSG
v#`P?B\ DECLARE_MESSAGE_MAP()
E&RK My) };
'B4j=K* LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
fj]) BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
FA;uu\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
*1;}c
z BOOL InitHotkey();
P(za8l> BOOL UnInit();
cLe659 & #endif
l]o&D))R &/A?*2 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/S+gh;2OC #include "stdafx.h"
c~+l|r=u? #include "hook.h"
I-
X|- #include <windowsx.h>
.pQ4#AJ #ifdef _DEBUG
mam2]St" #define new DEBUG_NEW
h $}&N #undef THIS_FILE
(""1[XURQK static char THIS_FILE[] = __FILE__;
gyW##M@{ #endif
htGk: #define MAX_KEY 100
Yj^n4G(h #define CTRLBIT 0x04
/Hl]$sJY #define ALTBIT 0x02
L7tC?F]}SK #define SHIFTBIT 0x01
kiFTx
&gf #pragma data_seg("shareddata")
29E9ZjSK HHOOK hHook =NULL;
T6ajWUw UINT nHookCount =0;
k%Q>lf<e static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
RHGs(d7- static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
3yu{Q z5y, static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
BJI
R !J static int KeyCount =0;
TY3WP$u static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
I)Dd"I #pragma data_seg()
lT3, G#( HINSTANCE hins;
"p~1|?T void VerifyWindow();
~cSOni` BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
s:y=X$&M //{{AFX_MSG_MAP(CHookApp)
*a7&v3X // NOTE - the ClassWizard will add and remove mapping macros here.
u@$C i/J* // DO NOT EDIT what you see in these blocks of generated code!
'i|z>si[* //}}AFX_MSG_MAP
iVt*N$iZ END_MESSAGE_MAP()
7usf^g[dh +SSF=]4+ CHookApp::CHookApp()
}pa@qZXh {
t*zBN!Wu_ // TODO: add construction code here,
V[Jd1T // Place all significant initialization in InitInstance
D@(Y.&_ }
`UpZk?k {g *kr1JM CHookApp theApp;
~',<7eW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
~E=.*: 5( {
(!U5B
Hnd BOOL bProcessed=FALSE;
r~uWr'}a} if(HC_ACTION==nCode)
GyOo$FW {
Cu0N/hBT if((lParam&0xc0000000)==0xc0000000){// Key up
3!0Eh8ncI switch(wParam)
F~dq7AS {
~)#JwY case VK_MENU:
gNO<`9q MaskBits&=~ALTBIT;
6t|FuTC break;
Oi=>Usd case VK_CONTROL:
YN
~7 nOw MaskBits&=~CTRLBIT;
k4+F break;
>*v^E9Y case VK_SHIFT:
m1X0stFRs" MaskBits&=~SHIFTBIT;
V Z[[zYe break;
uJ4RjLM` default: //judge the key and send message
$g55wG F
break;
n;0bVVMV }
3n/U4fn_ for(int index=0;index<MAX_KEY;index++){
Wm
nsD! if(hCallWnd[index]==NULL)
mB.kV Ve0 continue;
xGq,hCQHV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H/p<lp {
\ qc8;"@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
33_YZOy^j bProcessed=TRUE;
6<+R55 }
Oc;0*v[I }
n)w@\Uyc }
3
[lF else if((lParam&0xc000ffff)==1){ //Key down
y_$=Pu6H switch(wParam)
9qe6hF/29 {
x )wIGo case VK_MENU:
XX5 ):1 MaskBits|=ALTBIT;
uuzDu]Gwu break;
UDHk@M case VK_CONTROL:
|*0oz= MaskBits|=CTRLBIT;
5rqjqfFa break;
yG5T;O& case VK_SHIFT:
"PBUyh-Z MaskBits|=SHIFTBIT;
'g8~539{& break;
zm}4=Kz} default: //judge the key and send message
ip4:px- break;
C26PQGo#$ }
9~DoF]TM for(int index=0;index<MAX_KEY;index++)
_gK@),de {
)p>BN|L if(hCallWnd[index]==NULL)
7'_zJI^ continue;
AG2iLictv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
MPMJkL$F^ {
.9WJ/RKZ\D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
l
tr=_ bProcessed=TRUE;
KE+y'j#C3 }
8@|_];9#. }
#F.;N<a }
>De\2gbJ if(!bProcessed){
y@J]busU for(int index=0;index<MAX_KEY;index++){
kIV/o if(hCallWnd[index]==NULL)
@6>R/] continue;
I.j`h2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
pr.Vfb SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
2f>lgZ! }
^u#!Yo.!( }
TSmuNCR }
eP-q[U?$n return CallNextHookEx( hHook, nCode, wParam, lParam );
-c!{';Zn }
8w~I(2S:# ~zFs/(k BOOL InitHotkey()
!'Xk=+ {
zr?%k]A%UO if(hHook!=NULL){
vbmSbZ"y nHookCount++;
fR}|CP return TRUE;
.e5GJAW~9 }
_r5Q%8J else
59O;`y0 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
WEUr;f if(hHook!=NULL)
|Sy|E nHookCount++;
g>x2[//pk return (hHook!=NULL);
H1f){L97wR }
5.#r\' Z# BOOL UnInit()
LpJ\OI*v {
"-kb=fY if(nHookCount>1){
Z$Ynar nHookCount--;
Y4}!9x return TRUE;
D{h1"q }
dC_L~ }= BOOL unhooked = UnhookWindowsHookEx(hHook);
]v@#3,BV if(unhooked==TRUE){
f.rz2)o nHookCount=0;
&h-d\gMJ hHook=NULL;
mQBq-; }
7am ._K return unhooked;
Q3\j4;jI( }
XRKL;|cd gpsEN(.w BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
too=+'<N</ {
RyC]4QyC BOOL bAdded=FALSE;
w"bQxS~$y for(int index=0;index<MAX_KEY;index++){
gVsAz if(hCallWnd[index]==0){
49~5U+x; hCallWnd[index]=hWnd;
7_d gQI3y HotKey[index]=cKey;
DIH.c7o HotKeyMask[index]=cMask;
vL{~?vq6
bAdded=TRUE;
+q"d= KeyCount++;
'O8"M break;
"{&\ nt }
eHi|_3A&* }
tQbDP!,A*= return bAdded;
?C//UN; }
.GM&]Hb x:O?Fj BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Q1IN@Db}y {
6 DD^h:*> BOOL bRemoved=FALSE;
2BBGJE for(int index=0;index<MAX_KEY;index++){
<g5Btwo% if(hCallWnd[index]==hWnd){
G6_Kid}"q if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
K7Kd{9-2 hCallWnd[index]=NULL;
2J^6(vk HotKey[index]=0;
U5z^R>k HotKeyMask[index]=0;
y. @7aT5 bRemoved=TRUE;
(EIdw\ KeyCount--;
9`i=kp break;
BHOxwW{ }
Il%LI }
_\>? .gg$ }
NQ !t ` return bRemoved;
;#I(ucB< }
-RVwPY "2}04b|" void VerifyWindow()
69ia # {
U_m<W$"HF for(int i=0;i<MAX_KEY;i++){
m.EI("n"J if(hCallWnd
!=NULL){ Gn#5zx#l
if(!IsWindow(hCallWnd)){ 5Az=)q4Q
hCallWnd=NULL; <33[qt~
HotKey=0; }k.-xaj
HotKeyMask=0; LpeQx\
KeyCount--; l|^p;z:d
} 9XX&~GW/
} F:x" RbbF
} t8\F7F P
} m:d
P,
8n?qm96
BOOL CHookApp::InitInstance() di>"\On-
{ v#@"Evh7
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (Ybc~M)z
hins=AfxGetInstanceHandle(); thDQ44<#)
InitHotkey(); ]C3{ _?=
return CWinApp::InitInstance(); >y"W(
} xmb]L:4F
zJ93EtlF
int CHookApp::ExitInstance() WW\u}z.QJ
{ lPSyFb"
VerifyWindow(); B/:q
UnInit(); 21bvSK
return CWinApp::ExitInstance(); _d76jmujJ
} msM
0#<q]M?hW
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [-_3Zr
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *9y)B|P^
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >N62t9Ll[
#if _MSC_VER > 1000 [^$nt
#pragma once Fm_^7|
#endif // _MSC_VER > 1000 6X~.J4
BaZ$p O^
class CCaptureDlg : public CDialog P}29wr IZ
{ JS<S?j?*/
// Construction &l"/G%W
public: kfr' P u
BOOL bTray; r@ujE,D=k
BOOL bRegistered; }(A`aB_
BOOL RegisterHotkey(); 1fm4:xHH
UCHAR cKey; kd)Q$RA(
UCHAR cMask; XLb
lVi@
void DeleteIcon(); *`Swv`
void AddIcon(); 0uV3J
UINT nCount; EudX^L5U<d
void SaveBmp(); \(2w/~
CCaptureDlg(CWnd* pParent = NULL); // standard constructor a?S5 =
// Dialog Data {L~j;p_G&
//{{AFX_DATA(CCaptureDlg) h?R{5?RxK
enum { IDD = IDD_CAPTURE_DIALOG }; pMB!I9q
CComboBox m_Key; }A jE- K{
BOOL m_bControl; p[R4!if2
BOOL m_bAlt; /Cy4]1dw
BOOL m_bShift; lC/1,Z/M
CString m_Path; ?+av9;Kg
CString m_Number; K+MSjQS"
//}}AFX_DATA -fpe
// ClassWizard generated virtual function overrides @~ k4,dJ
//{{AFX_VIRTUAL(CCaptureDlg) 9$[6\jMh
public: } I>6 8dS[
virtual BOOL PreTranslateMessage(MSG* pMsg); oCfO:7
protected: JguPXHa0
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -Vg(aD
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); bGw56s'R5~
//}}AFX_VIRTUAL
_U.|$pU
// Implementation `-t8ag3
protected: )5T82=[h<
HICON m_hIcon; GDF/0-/Z
// Generated message map functions YI+ clh;%9
//{{AFX_MSG(CCaptureDlg) a-e_ q
virtual BOOL OnInitDialog(); V>Dqw!
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 'Qdea$o
afx_msg void OnPaint(); Z(j"\d!y
afx_msg HCURSOR OnQueryDragIcon(); 7Tb[sc'
virtual void OnCancel(); ]K?;XA3 dZ
afx_msg void OnAbout(); e!W U
afx_msg void OnBrowse(); +3uPHpMB-
afx_msg void OnChange(); T:T`M:C.
//}}AFX_MSG Ml_Hq>\U
DECLARE_MESSAGE_MAP() |L/EH~| O
}; O22Q
g
#endif 9xi nX-x;n
XHU\;TF
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mT:NC'b<9
#include "stdafx.h" BP4xXdG
#include "Capture.h" GYZP?E p*
#include "CaptureDlg.h" !"2S'oQKS
#include <windowsx.h> azz=,^U#
#pragma comment(lib,"hook.lib") BLN|QaZ
#ifdef _DEBUG K| dI'TnW
#define new DEBUG_NEW XGuxd
#undef THIS_FILE LZ34x: ,C
static char THIS_FILE[] = __FILE__; 7s0\`eXo/
#endif l+#J oc<8
#define IDM_SHELL WM_USER+1 SJB^dI**/d
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
|nCVM\+5T
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nU4to
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; aFaioE#h(
class CAboutDlg : public CDialog Ul_5"3ze
{ 7nm'v'\u+V
public: 9X?RJ."J
CAboutDlg(); h ;@c%Vm
// Dialog Data @ ]40xKF
//{{AFX_DATA(CAboutDlg) F\, vIS
enum { IDD = IDD_ABOUTBOX }; zauDwV=
//}}AFX_DATA X n8&&w"
// ClassWizard generated virtual function overrides |kH.o=
//{{AFX_VIRTUAL(CAboutDlg) QM![tZt%;
protected: nY7gST
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M^*\$K%
//}}AFX_VIRTUAL +OqEe[Wk#
// Implementation g<@Q)p*ow
protected: Uks%Mo9on
//{{AFX_MSG(CAboutDlg) h%U}Y5Ps~
//}}AFX_MSG 3. @LAF
DECLARE_MESSAGE_MAP() ;yajt\a
}; /oW]? 9
DK
eB%k
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) iO&*WIbg
{ >23$_'2
//{{AFX_DATA_INIT(CAboutDlg) *|<T@BXn
//}}AFX_DATA_INIT 3dSb!q0&N
} ,]:Gn5~
~`Rar2%B
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?JG^GD7D
{ D2g/P8.<A
CDialog::DoDataExchange(pDX); c7~R0nP
//{{AFX_DATA_MAP(CAboutDlg) cnS;9=,&
//}}AFX_DATA_MAP |.,]0CRg
} pHuR_U5*?
^B0Qk:%P^N
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t7l{^d_L
//{{AFX_MSG_MAP(CAboutDlg) #|4G,!
// No message handlers =\_gT=tZ
//}}AFX_MSG_MAP m%
3 D
END_MESSAGE_MAP() HdgNy \
x!fG%o~h
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~Th,<w*o
: CDialog(CCaptureDlg::IDD, pParent) mogmr
{ lP*n%Pn)
//{{AFX_DATA_INIT(CCaptureDlg) F)KR8(
m_bControl = FALSE; I 1n,c d[
m_bAlt = FALSE; (BFwE@1"
m_bShift = FALSE; ~;?<OOt|wG
m_Path = _T("c:\\"); tu Y+n2
m_Number = _T("0 picture captured."); od{\z
nCount=0; 4d%0a%Z
bRegistered=FALSE; q\}+]|nGs
bTray=FALSE; ,cL;,YN
//}}AFX_DATA_INIT 5@%.wb4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]iGeqwT
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;1[Z&Uv8
} 8q%y(e
"!D y[J
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =/_u k{
{
_XT'h;m
CDialog::DoDataExchange(pDX); $,2T~1tE
//{{AFX_DATA_MAP(CCaptureDlg) PcEE`.
DDX_Control(pDX, IDC_KEY, m_Key); Yb-{+H8{J
DDX_Check(pDX, IDC_CONTROL, m_bControl); zPND$3&'
DDX_Check(pDX, IDC_ALT, m_bAlt); E(j#R"
DDX_Check(pDX, IDC_SHIFT, m_bShift); P
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DDX_Text(pDX, IDC_PATH, m_Path); *<W8j[?
DDX_Text(pDX, IDC_NUMBER, m_Number); S\h5
D2G;
//}}AFX_DATA_MAP v+"4YIN
} w6Nnx5Ay
yw$4Hlj5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n8F~!|lQ0
//{{AFX_MSG_MAP(CCaptureDlg) k'PvTWR
ON_WM_SYSCOMMAND() 4")`}T
ON_WM_PAINT() 2?GMKd)
ON_WM_QUERYDRAGICON()
}mXYS|{
ON_BN_CLICKED(ID_ABOUT, OnAbout) GkX Se)#p
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ('SId@
ON_BN_CLICKED(ID_CHANGE, OnChange) Qw:!Rw,x
//}}AFX_MSG_MAP >>
"gb/x,
END_MESSAGE_MAP() 6IG?t
^e_LnJ+
BOOL CCaptureDlg::OnInitDialog() 3q}j"x?
{ !}z'"l4i
CDialog::OnInitDialog(); 5\MC5us3
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Z.Yq)\it
ASSERT(IDM_ABOUTBOX < 0xF000); itP`{[
CMenu* pSysMenu = GetSystemMenu(FALSE); 6ki2/ Q
if (pSysMenu != NULL) a3<:F2=~\
{ +ZM,E8
CString strAboutMenu; 3}<U'%sd
strAboutMenu.LoadString(IDS_ABOUTBOX); 3y6\0|{1
if (!strAboutMenu.IsEmpty()) (_zlCHB
{ ><
$LV&
pSysMenu->AppendMenu(MF_SEPARATOR); /T)E&=Ds
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A}SGw.3
} 0o=HOCL\
} ^"X.aksA
SetIcon(m_hIcon, TRUE); // Set big icon U_(>eVi7F
SetIcon(m_hIcon, FALSE); // Set small icon lb.Q^TghU
m_Key.SetCurSel(0); 6sSwSS
RegisterHotkey(); <'~m1l#2
CMenu* pMenu=GetSystemMenu(FALSE); C)z4Cn9#
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ? +L,
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); = 'NV3by
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hr}f5Z)^v
return TRUE; // return TRUE unless you set the focus to a control &7f8\TG|
} _ \6v@
&
"&s,
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^obuMQ;
{ E(P
6s;LZ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) FKTF?4+\U
{ ;"Kgg:K>W
CAboutDlg dlgAbout; 5,1<A@H
dlgAbout.DoModal(); z}ar$}T
} cK+TE8ao
else Y=P*
{ 'd+fGx7i
CDialog::OnSysCommand(nID, lParam); =Z
} V ql4*OJW
} qT@h/Y
|nZ^RCHog
void CCaptureDlg::OnPaint() aDKb78 1d
{ </{Zb.
if (IsIconic()) P9bM+@5e
{ X ha9x,
CPaintDC dc(this); // device context for painting I "AjYv4R
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^m w]u"5\
// Center icon in client rectangle HeAXZA,
int cxIcon = GetSystemMetrics(SM_CXICON); dtC@cK/,D
int cyIcon = GetSystemMetrics(SM_CYICON); ~\_VWXXvIW
CRect rect; wQ/* f9
GetClientRect(&rect); 3F2IL)Hn
int x = (rect.Width() - cxIcon + 1) / 2; X
."z+-eh
int y = (rect.Height() - cyIcon + 1) / 2; m}uOBR+
// Draw the icon b&U1^{(
dc.DrawIcon(x, y, m_hIcon); '`P%;/z
} Y[6T7eZ0g
else J,yKO(}<C
{ (`.OS)&
CDialog::OnPaint(); XP@dg4Z=z
} ,Z@#( =f
} ( 2HM"Pd
4k;FZo]S
HCURSOR CCaptureDlg::OnQueryDragIcon() X&pYLm72;
{ #{8IFA
return (HCURSOR) m_hIcon; 'Rn-SD~gIr
} pbzFzLal
8}B
void CCaptureDlg::OnCancel() W`;;fJe
{ kh
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if(bTray) zeHF-_{
DeleteIcon(); U>E:
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CDialog::OnCancel(); fwFJe(.
} xol%\$|
Y@+Rb
void CCaptureDlg::OnAbout() d.wGO]"
{ Tc6cBe,
CAboutDlg dlg; 2I-d.{
dlg.DoModal(); _uQ]I^ 'D
} {]HiT pn
_Op%H)
void CCaptureDlg::OnBrowse() &kg^g%%
{ _!03;zrO
CString str; kv:9Fm\$
BROWSEINFO bi; ENTcTrTn
char name[MAX_PATH]; aOzIo-
ZeroMemory(&bi,sizeof(BROWSEINFO)); iS$[dC ?N
bi.hwndOwner=GetSafeHwnd();
>2s4BV[(
bi.pszDisplayName=name; $o[-xNn1
bi.lpszTitle="Select folder"; J/je/PC
bi.ulFlags=BIF_RETURNONLYFSDIRS; &h334N|4{
LPITEMIDLIST idl=SHBrowseForFolder(&bi); hQn?qJy%W
if(idl==NULL) <~smBd
return; p;+O/'/j
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "\b>JV5
str.ReleaseBuffer(); RQ,#TbAe
m_Path=str; D\Ak-$kJ^
if(str.GetAt(str.GetLength()-1)!='\\') QL/KY G
m_Path+="\\"; A[Mke
UpdateData(FALSE); ~:a1ELqVw
} z#tIa
iq; |
i!
void CCaptureDlg::SaveBmp() 75# 8P?i
{ g&$=Y7G
CDC dc; tIuM9D{P
dc.CreateDC("DISPLAY",NULL,NULL,NULL); *2/Jg'de
CBitmap bm; axC|,8~tq
int Width=GetSystemMetrics(SM_CXSCREEN); 'c35%?]
int Height=GetSystemMetrics(SM_CYSCREEN); Z.\q$U7'9
bm.CreateCompatibleBitmap(&dc,Width,Height); ;I>nA6A
CDC tdc; cJ4My#w
tdc.CreateCompatibleDC(&dc); cJo%j -AM
CBitmap*pOld=tdc.SelectObject(&bm); \O|SPhaIf
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7Jn%XxHq
tdc.SelectObject(pOld); "V|Rq]_+%
BITMAP btm; S<nF>JRJa
bm.GetBitmap(&btm); rqamBm 5
DWORD size=btm.bmWidthBytes*btm.bmHeight; Q0xO;20
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]Ur/DRNS
BITMAPINFOHEADER bih; [b++bCH3
bih.biBitCount=btm.bmBitsPixel; |qNe_)
bih.biClrImportant=0; .|,LBc!
bih.biClrUsed=0; >tM4|w|
bih.biCompression=0; @;/Pl>$|'G
bih.biHeight=btm.bmHeight; r[L.TX3Ah=
bih.biPlanes=1; 9Dx~!(
bih.biSize=sizeof(BITMAPINFOHEADER); ._}}@V_/
bih.biSizeImage=size; z=D5*
bih.biWidth=btm.bmWidth; :aNjh
bih.biXPelsPerMeter=0; S2$E`'
J
bih.biYPelsPerMeter=0; qezWfR`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6Og@tho
static int filecount=0; (?qCtLZ
CString name; Sy8t2lk
name.Format("pict%04d.bmp",filecount++); =3bk=vy
name=m_Path+name; ;8]HCC@:
BITMAPFILEHEADER bfh; s%jBIeh
bfh.bfReserved1=bfh.bfReserved2=0; HWjJ.;k}a
bfh.bfType=((WORD)('M'<< 8)|'B'); ^z
*0
bfh.bfSize=54+size; !<w6j-S
bfh.bfOffBits=54; S@qPf0dL<
CFile bf; K"!rj.Da
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @M'k/jl
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9)!Ksg(h
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AwJg/VBo)
bf.WriteHuge(lpData,size); xQFRM aQE
bf.Close(); 5 {! fa
nCount++; r^ ,_m,s'<
} b<u\THy#
GlobalFreePtr(lpData); eb_.@.a
if(nCount==1) .}dLqw
m_Number.Format("%d picture captured.",nCount); 7U [C=NL
else
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m_Number.Format("%d pictures captured.",nCount); qYoW8e
UpdateData(FALSE); c~T{;
} :w^:Z$-hf
:|j[{;asY
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ~?/7:S
{ DI0& _,
if(pMsg -> message == WM_KEYDOWN) ) 57'<
{ RZz?_1'
if(pMsg -> wParam == VK_ESCAPE) Il=6t
return TRUE;
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if(pMsg -> wParam == VK_RETURN) &GH[$(
return TRUE; [<B,6nAl
} IogLkhWX
return CDialog::PreTranslateMessage(pMsg); C
>OeULD
} Hca(2 ]T-
!{&r|6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x.1=QF{!
{ =]@Bc
7@
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Zr}>>aIJ]k
SaveBmp(); amsl>wc!
return FALSE; 11PL1zzH
} Vz mlKVE
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]yOM
CMenu pop; 2^XmtT
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6C$+D
CMenu*pMenu=pop.GetSubMenu(0); I gJu/{:y^
pMenu->SetDefaultItem(ID_EXITICON); o#FctM'Z
CPoint pt; #hBqgG:>
GetCursorPos(&pt); #c|l|Xvq2
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); LNL}R[1(
if(id==ID_EXITICON)
*RY}e
DeleteIcon(); g!0
j1
else if(id==ID_EXIT) h),;j`PrC
OnCancel(); IsE&k2 SD
return FALSE; {tVA(&\<
} jnV#Q
;
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Gr({30"8
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) m]DP{-s4
AddIcon(); {JWixbA
return res; T)tr"<F5NP
} [)`*k#.=
yK{P%oh)
void CCaptureDlg::AddIcon() RlfI]uCDM
{ {r&r^!K;
NOTIFYICONDATA data; &wNr2PHd#
data.cbSize=sizeof(NOTIFYICONDATA); cJSNV*<
CString tip; W@}@5,}f>
tip.LoadString(IDS_ICONTIP); B+FTkJ0t+G
data.hIcon=GetIcon(0); +aL6$
data.hWnd=GetSafeHwnd(); x.gz sd
strcpy(data.szTip,tip); |mhKD#:
data.uCallbackMessage=IDM_SHELL; oX6Cd:c-
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >uCO=T,|
data.uID=98; PCCE+wC6
Shell_NotifyIcon(NIM_ADD,&data); X}B]5
ShowWindow(SW_HIDE); &Zz&VwWR
bTray=TRUE; 8h
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} <_/etw86Z
DvWBvs,
void CCaptureDlg::DeleteIcon() ,5 ,r.
{ 2-S}#S}2C
NOTIFYICONDATA data; #8d#Jw
data.cbSize=sizeof(NOTIFYICONDATA); S> Fb'rJ3
data.hWnd=GetSafeHwnd(); IlEU6Rs
data.uID=98; [<+T@"y
Shell_NotifyIcon(NIM_DELETE,&data); >u%Bn\G
ShowWindow(SW_SHOW); @kd$.7Y9
SetForegroundWindow(); s\.r3U&6
ShowWindow(SW_SHOWNORMAL); 2zo>`;l
bTray=FALSE; c%<81Y=
} S*r }oX0
dhLd2WSyH
void CCaptureDlg::OnChange() # wn>S<
{ _WV13pnRu
RegisterHotkey(); b?k,_;\
} ca
&zYXy
^cdbM
BOOL CCaptureDlg::RegisterHotkey() ,ig`'U
{ Lh+7z>1
UpdateData(); )~)T[S
UCHAR mask=0; kb-XEJ}L
UCHAR key=0; ; 180ct4
if(m_bControl) =>*}qen
mask|=4; _bh$
t
if(m_bAlt) >>=zkPy
mask|=2; 25G~rklk
if(m_bShift) VU\G49
mask|=1; NX8w(~r,:
key=Key_Table[m_Key.GetCurSel()]; KjA7x
if(bRegistered){ @sR/l;
DeleteHotkey(GetSafeHwnd(),cKey,cMask); <MxA;A
bRegistered=FALSE; }2=~7&)
} c7rC !v
cMask=mask; +o.#']}Pl
cKey=key; j;Z
hI y
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %PVu>^
return bRegistered; f`}u9!jVR
} jp-(n z\
9aID&b+
四、小结 z#5qI',L
{s@&3i?ZiC
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。