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:
B%J%TR_
}j(2Dl 一、实现方法
9N
D+w6"
2ZG1n# 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:
_| -+=:+LhSMb #pragma data_seg("shareddata")
#H6g&)Z_ HHOOK hHook =NULL; //钩子句柄
j"IM,= UINT nHookCount =0; //挂接的程序数目
51M^yG&M static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
99Yo1Q0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
~d%;~_n static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
)ozcr^ static int KeyCount =0;
)ClMw!ZrU static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
2vkB<[tSs #pragma data_seg()
6=,#9C9 V9E6W*IE 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。
Lkl|4L h [IYA1/y 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:
Xs>s|_T .K@x4
/1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
x1BOW cKey,UCHAR cMask)
+|?|8"Qg {
SE^b0ZV*x BOOL bAdded=FALSE;
.FKJyzL for(int index=0;index<MAX_KEY;index++){
q^N0abzgP if(hCallWnd[index]==0){
j|&DP-@g/ hCallWnd[index]=hWnd;
f' '{.L HotKey[index]=cKey;
;>Ca(Y2M HotKeyMask[index]=cMask;
'>e79f-O) bAdded=TRUE;
iTLW<wG KeyCount++;
\+{t4Im break;
o3F|#op }
-jVaS wt }
i$bzdc#s return bAdded;
9si}WqAw }
{x[;5TM //删除热键
z9M.e. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
NT@YLhs? {
W]O@DS zR BOOL bRemoved=FALSE;
2Io6s' for(int index=0;index<MAX_KEY;index++){
p?V?nCv1O if(hCallWnd[index]==hWnd){
oQ%\[s$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
3^\?>C7 hCallWnd[index]=NULL;
n5v' HotKey[index]=0;
*#1y6^ HotKeyMask[index]=0;
M@~~f
bRemoved=TRUE;
'%SR. JL KeyCount--;
)u8*zwq break;
tlV &eN }
}!%JYG^!D }
V uG?B{ }
*;hY.EuoFz return bRemoved;
i<T P: }
q^a|wTC UvxSMD:A V@D]bV@4 DLL中的钩子函数如下:
9Uha2o y=AsgJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/gz:zThf{ {
weAn&h| BOOL bProcessed=FALSE;
L[?nST18% if(HC_ACTION==nCode)
/!GKh5| {
SY-ez91 if((lParam&0xc0000000)==0xc0000000){// 有键松开
Eh\ 1O(a( switch(wParam)
9>by~4An? {
"h=6Q+Ze case VK_MENU:
Y1{B c<tC MaskBits&=~ALTBIT;
nPcS3!7B# break;
6HoqEku/Q case VK_CONTROL:
EgTFwEj MaskBits&=~CTRLBIT;
(1 CJw: break;
iF!mV5# case VK_SHIFT:
#s"851e MaskBits&=~SHIFTBIT;
+TC1nkX break;
R7K!A
% default: //judge the key and send message
g"wxC@IR break;
0$6*o}N% }
|6E
.M1 for(int index=0;index<MAX_KEY;index++){
%*lp< D if(hCallWnd[index]==NULL)
Q1Ux!$_ continue;
)kYOHS if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pb#mg^8 {
~e P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Nl@k*^ bProcessed=TRUE;
WwuZ(>| }
?O??cjiA@ }
8L%M<JRg~ }
]q{
PDZ
else if((lParam&0xc000ffff)==1){ //有键按下
iq?l#}] switch(wParam)
eNRs&^ {
!X|k"km" case VK_MENU:
{<2>6 _z MaskBits|=ALTBIT;
hd
B
|#t break;
#,L~w case VK_CONTROL:
7^$)VBQ/ MaskBits|=CTRLBIT;
'0|o`qoLzA break;
7JUb Va% case VK_SHIFT:
z}ElpT[(; MaskBits|=SHIFTBIT;
0DNU,u break;
#^6^ default: //judge the key and send message
9R
p2W break;
)MZC>: }
H}Ucrv: for(int index=0;index<MAX_KEY;index++){
fc@'9-pt if(hCallWnd[index]==NULL)
['cz;2{:W continue;
ju|]Qlek if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
xRum*}|4 {
Qzqc .T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
BkawL, bProcessed=TRUE;
@w\I qr
}
|;+qld[4z }
lCJ6Ur; }
kA4@`YCl if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
X32C}4-B for(int index=0;index<MAX_KEY;index++){
~`qEWvPn if(hCallWnd[index]==NULL)
u%3i0BajY continue;
1!1!PA9u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p[9s<lEh SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
-)v@jlg02 //lParam的意义可看MSDN中WM_KEYDOWN部分
irbw'^;y }
_V2xA88 }
thc <xxRP }
=dZHYO^Cv return CallNextHookEx( hHook, nCode, wParam, lParam );
:z&7W< }
m&*JMA;^ s?2$ue&-f 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:
w(9*7p p 3Fs5RC~a BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3B0PGvCI1 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-C-yQ.>\T# Qkcjr]#^$ 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:
"ZrOrdlg+A %<0eA`F4 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
?'s6Xmd {
mh.+."<)F if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
{pL+2%`~ {
H[
m<RaG8 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
C0jj(ku& SaveBmp();
}}|)Yq return FALSE;
^uBxgWIC }
? *>]")[> …… //其它处理及默认处理
*.#oxcll }
>UDd @ -
e"jw#B .,0b E 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。
=WIJ>#Go< 1v zb8. 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。
#bX9Tu0 99xEm 二、编程步骤
-fS.9+k0/ EV pi^>M 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";
#|[
M?3 6eFp8bANN# 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
7aV%=_ ;&V s4 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;
R:X0'zeRr i|`dWOVb 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;
aJ Z"D8C UT0){%2@ 5、 添加代码,编译运行程序。
t>=fTkB Rk!X]-`= 三、程序代码
5GA C`}} 'k;rH!R ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
-Eu6U`"( #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
#Cpd9| #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
wLc4Dm*V #if _MSC_VER > 1000
MZ+^-@X #pragma once
~t9tnLc$ #endif // _MSC_VER > 1000
(aOv#Vor]% #ifndef __AFXWIN_H__
8YC_3Yi% #error include 'stdafx.h' before including this file for PCH
9mA{K #endif
^[:p|U2mA #include "resource.h" // main symbols
BauU{:Sh class CHookApp : public CWinApp
VD_$$Gn*q {
p
w8 s8? public:
}gJ (DbnV CHookApp();
}zhGS!fO // Overrides
Z#rB} // ClassWizard generated virtual function overrides
!1e6Ss //{{AFX_VIRTUAL(CHookApp)
6I@h9uIsze public:
g+J-Zg6 virtual BOOL InitInstance();
>=[(^l virtual int ExitInstance();
'7XIhN9 //}}AFX_VIRTUAL
/~zai} //{{AFX_MSG(CHookApp)
Y "/]|'p // NOTE - the ClassWizard will add and remove member functions here.
tQS5hwm* // DO NOT EDIT what you see in these blocks of generated code !
c%MW\qx //}}AFX_MSG
%i5M77#Z DECLARE_MESSAGE_MAP()
q
FAT]{{ };
l<A|d{" ] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
@3zg=?3 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
rk #sy$ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
BocSwf;v. BOOL InitHotkey();
)ubiB^g'm BOOL UnInit();
gP;&e:/3 #endif
Q)IKOt;N]
5~>z h //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
ZzSz%z_sE #include "stdafx.h"
8uWa=C) #include "hook.h"
97}OL`y #include <windowsx.h>
"'t0h{Wr8 #ifdef _DEBUG
.>WxDQIo #define new DEBUG_NEW
abyo4i5T #undef THIS_FILE
HhvdqvIEG static char THIS_FILE[] = __FILE__;
`hQ5VJo #endif
Ru>MFG #define MAX_KEY 100
PK `D8)=u #define CTRLBIT 0x04
_no*k?o* #define ALTBIT 0x02
c9&xe"v #define SHIFTBIT 0x01
;IZwTXu !S #pragma data_seg("shareddata")
a ?)NC HHOOK hHook =NULL;
dZ0A3(t UINT nHookCount =0;
~5}*
d static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
$7^o#2
B static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
OG>}M$Ora static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
zd >t-?g static int KeyCount =0;
ZZzMO6US0 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
2*^j #pragma data_seg()
nH[yJGZYSA HINSTANCE hins;
V<T9&8l+: void VerifyWindow();
-C(crn BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
"W955?4m //{{AFX_MSG_MAP(CHookApp)
]H+8rY%+ // NOTE - the ClassWizard will add and remove mapping macros here.
P*3BB>FO // DO NOT EDIT what you see in these blocks of generated code!
x"~8*V'0 //}}AFX_MSG_MAP
T?ZRiR)@ END_MESSAGE_MAP()
h7lDHIQf r{L>
F]Tw CHookApp::CHookApp()
#Y
a4ps_ {
CVL3VT1j0 // TODO: add construction code here,
Ch<[l8;K // Place all significant initialization in InitInstance
I
8`VNA&b }
#P0&ewy -g*4(w CHookApp theApp;
uKUiV%p! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
FQ<Ju. {
z[L8$7L BOOL bProcessed=FALSE;
aBNc(?ri if(HC_ACTION==nCode)
Nfrw0b {
$P^q!H4D if((lParam&0xc0000000)==0xc0000000){// Key up
FWrX3i switch(wParam)
chM%]|gey {
5YE'L. case VK_MENU:
XDOY`N^L MaskBits&=~ALTBIT;
;-~B)M_S` break;
L*xhGoC= case VK_CONTROL:
`T@i. 'X MaskBits&=~CTRLBIT;
"O3tq=Q break;
cQCSe,$ W case VK_SHIFT:
[9evz}X MaskBits&=~SHIFTBIT;
/R]U}o^/(% break;
tdBm
(CsN default: //judge the key and send message
N
+Yxz;Mg break;
y" RF;KW> }
$p#Bi-& for(int index=0;index<MAX_KEY;index++){
AG`L64B if(hCallWnd[index]==NULL)
bnf'4PAt continue;
/?5 1D@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+Vb.lH[av {
LDgrR[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
naG=Pq< bProcessed=TRUE;
?+@n3]`0 }
qeV fE_< }
J=9FRC }
P{kur} T else if((lParam&0xc000ffff)==1){ //Key down
/M1ob: m switch(wParam)
;DqWh0 {
!;q&NHco case VK_MENU:
_{I3i:f9X8 MaskBits|=ALTBIT;
+"\sc;6m. break;
P+@/O case VK_CONTROL:
t<.)Z-Ii MaskBits|=CTRLBIT;
DR5\45v break;
36}?dRw#p case VK_SHIFT:
o4G ?nvK- MaskBits|=SHIFTBIT;
CGW.I$u break;
T*Y~\~Jhu default: //judge the key and send message
[kVS
O break;
?GKb7Oj }
>)fi^ for(int index=0;index<MAX_KEY;index++)
q/4J.jL {
9UdM`v)( if(hCallWnd[index]==NULL)
rK' L6o continue;
EH+"~-v)ae if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gX@HO|.t {
XRM_x:+] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
:C(=&g<]D bProcessed=TRUE;
^me-[
5 }
u%&`}g }
dyz2.ZY~2 }
EizKoHI-z if(!bProcessed){
(9''MlGd% for(int index=0;index<MAX_KEY;index++){
Q|S.R1L^ if(hCallWnd[index]==NULL)
l+xX/A) continue;
2V-
16Q'% if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jwc)Lj} SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
E:UW#S%A
f }
fiK6@, }
orzZ{87 }
>,V9H$n return CallNextHookEx( hHook, nCode, wParam, lParam );
x|/|jzJSX }
>N^Jj:~l $Xv* ,Bq BOOL InitHotkey()
nsu@h {
Xb|:vr\v if(hHook!=NULL){
B]nEkO'a: nHookCount++;
Y071Y: return TRUE;
~^NtO }
g!g#]9j else
8bTn^!1 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
[<Mx2<8f if(hHook!=NULL)
kvL=>
A nHookCount++;
!j9t*2m[ return (hHook!=NULL);
epA:v|S }
l5S aT,% BOOL UnInit()
)Kc<j!8-[ {
$SlIr<'*" if(nHookCount>1){
%f&/E"M nHookCount--;
K0u|U` return TRUE;
tURu0`]( }
5bRJS70M BOOL unhooked = UnhookWindowsHookEx(hHook);
G)EU_UE9 if(unhooked==TRUE){
8zZvht* nHookCount=0;
3@etRd;]Kr hHook=NULL;
\\iQEy<i }
&PR5q7 return unhooked;
rN<0
R`4sE }
R3
-n>V5o lUOF4U&r BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[T8WThs {
F%@A6'c BOOL bAdded=FALSE;
E-T)*`e for(int index=0;index<MAX_KEY;index++){
lEH65;Nh* if(hCallWnd[index]==0){
_F6OM5F"N hCallWnd[index]=hWnd;
:i0uPh\0 HotKey[index]=cKey;
$njUXSQ; HotKeyMask[index]=cMask;
S3q&rqarC% bAdded=TRUE;
4`4kfiS$ KeyCount++;
Tm~" IB* break;
\o z#l'z }
-R|,9o^ }
6hno)kd{= return bAdded;
8H%;WU9- }
iN bIp"W ]N~2 .h BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
UE8kpa)cQ {
fe\mL mK9 BOOL bRemoved=FALSE;
VpE*(i$ for(int index=0;index<MAX_KEY;index++){
~8PZ5;g if(hCallWnd[index]==hWnd){
u}#(.)a: if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
1vS#K=sb hCallWnd[index]=NULL;
Ow+GS{-q HotKey[index]=0;
LD+{o 4i
HotKeyMask[index]=0;
216 RiSr* bRemoved=TRUE;
TJ2=m9Z KeyCount--;
j
b!x: break;
4-l8,@9 }
.N,bIQnj }
57'*w]4f }
BGvre'67 return bRemoved;
FI)17i$
}
[@&m4 7 %vn|k[nD void VerifyWindow()
'f#{{KA {
PIJr{6B/PA for(int i=0;i<MAX_KEY;i++){
K%,2=. if(hCallWnd
!=NULL){ 4.k0<
if(!IsWindow(hCallWnd)){ @D]5c ivm_
hCallWnd=NULL; ^ sOQi6pL
HotKey=0; =J18eH!]
HotKeyMask=0; {JO^tI
KeyCount--; q;B4WL}
} h\$$JeSV]
} #Vnkvvv
} kDEXN
} x,'(5*
&u]8IEv}u
BOOL CHookApp::InitInstance() } +TORR?
{ a[>/h3
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Q0)#8Rcm
hins=AfxGetInstanceHandle(); oTEL?hw5
InitHotkey(); 3$9s\<j
return CWinApp::InitInstance(); O\
GEay2
} l3{-z4mw
?U%qPv:
int CHookApp::ExitInstance() >1.X*gi?-
{ dph{74Dc
VerifyWindow(); '3R`lv
UnInit(); $By<$
return CWinApp::ExitInstance(); )!3V/`I
} M-$%Rzl_
lXx=But
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^6jV_QM#
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9Uh"iMB
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kVuUjP6(c
#if _MSC_VER > 1000 fJ=0HNmX
#pragma once sSr&:BOsi
#endif // _MSC_VER > 1000 $|zX|
6`&a&%,O
class CCaptureDlg : public CDialog Ja|5 @
{ ;"xfOzQ
// Construction \Q {m9fE
public: _jvxc'6
BOOL bTray; SU MrFd~
BOOL bRegistered; ,bZL C
BOOL RegisterHotkey(); N,<uf@LQ
UCHAR cKey; <]6SN
UCHAR cMask; C+*d8_L
void DeleteIcon(); B~?*?Z'
void AddIcon(); kS %Ydy#:'
UINT nCount; 6{@w="VT
void SaveBmp(); k6;?)~.
CCaptureDlg(CWnd* pParent = NULL); // standard constructor aH yx_B
// Dialog Data Hf%@3X
//{{AFX_DATA(CCaptureDlg) k)i3
enum { IDD = IDD_CAPTURE_DIALOG }; W6^5YH%
CComboBox m_Key; JL`-0P<M
BOOL m_bControl; z$&{:\hj
BOOL m_bAlt; aKJwofD
BOOL m_bShift; L{#IT.
CString m_Path; uY{|szC^2
CString m_Number; Z@yW bjE7Z
//}}AFX_DATA g6yB6vk
// ClassWizard generated virtual function overrides 'HO$C,1]
//{{AFX_VIRTUAL(CCaptureDlg) rExnxQ<e
public: l.(v^3:X
virtual BOOL PreTranslateMessage(MSG* pMsg); ~b(i&DVK
protected: @tF\p
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \|n-
O=}=2
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); <NHH^M\N
//}}AFX_VIRTUAL R$EW4]j
// Implementation 2d>z1%'
protected: H(H<z,$}T
HICON m_hIcon; Oylf<&knF\
// Generated message map functions %9
SJ
E
//{{AFX_MSG(CCaptureDlg) i9rN9Mq?O
virtual BOOL OnInitDialog(); @g|v;B|{
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u/UrAqw
afx_msg void OnPaint(); @Rg/~\ K
afx_msg HCURSOR OnQueryDragIcon();
nI[os
virtual void OnCancel(); dSLU>E3g
afx_msg void OnAbout(); ;Y)w@bNt@
afx_msg void OnBrowse(); bAdn &
afx_msg void OnChange(); ov|d^)'
//}}AFX_MSG {5A2&
DECLARE_MESSAGE_MAP() J.3u^~zy
}; <3L5"77G6
#endif 2"COP>
XUrXnz|>
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PG2: ~$L0
#include "stdafx.h" .7^c@i[
#include "Capture.h" .4S.>~^7
#include "CaptureDlg.h" ]z;P9B3@&
#include <windowsx.h> 6S},(=
#pragma comment(lib,"hook.lib") sZ'nYo
#ifdef _DEBUG H!c@klD
#define new DEBUG_NEW u+dLaVlLJ
#undef THIS_FILE } FE>|1
static char THIS_FILE[] = __FILE__; k3~}7]O)
#endif 2L!u1
#define IDM_SHELL WM_USER+1 V#v`(j%
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b}\N;D.{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); evenq$
H
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %]\kgRr
class CAboutDlg : public CDialog
#+JG(^%B
{ 4d"r^y'
public: S2E8Gq9
CAboutDlg(); GeI-\F7b
// Dialog Data Cwr~HY
//{{AFX_DATA(CAboutDlg) ^0Zf,40
enum { IDD = IDD_ABOUTBOX }; N1}c9}
//}}AFX_DATA X3(tuqmi
// ClassWizard generated virtual function overrides a,Sw4yJ!Q
//{{AFX_VIRTUAL(CAboutDlg) =NpYFKmMhV
protected: FW.7'7G@n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z Eq GD2"
//}}AFX_VIRTUAL iyN:%ofh
// Implementation 'Jiw@t<o3`
protected: v0ujdp,B
//{{AFX_MSG(CAboutDlg) vx\r!]
//}}AFX_MSG ih)zG
DECLARE_MESSAGE_MAP() $Y;U[_l#
}; v/@^Q1G/:
y>:N{|
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1}S S+>`
{ rUwZMli
//{{AFX_DATA_INIT(CAboutDlg) bw(a6qKK
//}}AFX_DATA_INIT 'QJ:`)z
} 90Pl$#cb2
dMPc:tJT
void CAboutDlg::DoDataExchange(CDataExchange* pDX) c>,KZ!
{ 9 *xR6
CDialog::DoDataExchange(pDX); czA5n
//{{AFX_DATA_MAP(CAboutDlg) R$v[!A+:'
//}}AFX_DATA_MAP N1Ng^aY0
} vGvf<ra;H
^/)^7\@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) d^@ dzNv
//{{AFX_MSG_MAP(CAboutDlg) I?]ohG K
// No message handlers @#<D ^"
//}}AFX_MSG_MAP Q`~jw>x
END_MESSAGE_MAP() ^pxX]G]
7X`l&7IXP
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?:pP8/y
: CDialog(CCaptureDlg::IDD, pParent) ~Uj=^leYO
{ ;m0~L=w
//{{AFX_DATA_INIT(CCaptureDlg) :Hn6b$Vy8
m_bControl = FALSE; :uP,f<=)K
m_bAlt = FALSE; kh!FR u h
m_bShift = FALSE; vhe>)h*B
m_Path = _T("c:\\"); 7z/|\D_{
m_Number = _T("0 picture captured."); w+C7BPV&
nCount=0; t\?ik6
bRegistered=FALSE; mGtdO/C#B
bTray=FALSE; VX].3=T8
//}}AFX_DATA_INIT >i_2OV
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 j@=%_^:i
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R}'bP
} R(!s
UXeN 8
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;"KJ7p
{ mkMq
CDialog::DoDataExchange(pDX); lyIl-!|
//{{AFX_DATA_MAP(CCaptureDlg) \@WDV
DDX_Control(pDX, IDC_KEY, m_Key); -mAUo;O
DDX_Check(pDX, IDC_CONTROL, m_bControl); WgR).Yx
DDX_Check(pDX, IDC_ALT, m_bAlt); ,f<?;z
DDX_Check(pDX, IDC_SHIFT, m_bShift); vmi+_]
DDX_Text(pDX, IDC_PATH, m_Path); DD7h^-x
DDX_Text(pDX, IDC_NUMBER, m_Number); $g@=Z"
//}}AFX_DATA_MAP xRJ\E }/7
} M.Y~1c4f
S\LkL]qx
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *Tas`WA
//{{AFX_MSG_MAP(CCaptureDlg) yGI;ye'U
ON_WM_SYSCOMMAND() u0 P|0\
ON_WM_PAINT() bmJ5MF]_fG
ON_WM_QUERYDRAGICON() _|iSF2f,X
ON_BN_CLICKED(ID_ABOUT, OnAbout) KmMzH`t}`
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1=t>HQ
ON_BN_CLICKED(ID_CHANGE, OnChange) }]e-{C}
//}}AFX_MSG_MAP ?Fi=P#
END_MESSAGE_MAP() ]|!OP
F{Z~ R
BOOL CCaptureDlg::OnInitDialog() 0QFS
{ zxMXXm;
CDialog::OnInitDialog(); dUsYZdQs
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); $()5VMb
ASSERT(IDM_ABOUTBOX < 0xF000); 9Kpa><
CMenu* pSysMenu = GetSystemMenu(FALSE); M2d$4-<
if (pSysMenu != NULL) RwKdxK+;
{ Mc=$/ o
CString strAboutMenu; OJ,`
strAboutMenu.LoadString(IDS_ABOUTBOX); uPhK3nCGo
if (!strAboutMenu.IsEmpty()) t,,k
{ 6tX q:
pSysMenu->AppendMenu(MF_SEPARATOR); Ci?Ss+|
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); t|a2;aq_
} 8u"!dq
} Vc_'hz]Z
SetIcon(m_hIcon, TRUE); // Set big icon 0vFD3}~>
SetIcon(m_hIcon, FALSE); // Set small icon OSlvwH%(EE
m_Key.SetCurSel(0); Hx#;Z
RegisterHotkey(); ?!;7:VIE
CMenu* pMenu=GetSystemMenu(FALSE); AB=daie
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;LcVr13J/
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9}l33T4T
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); XDsx3Ws
return TRUE; // return TRUE unless you set the focus to a control esHg'8?U
} 0F]>Jby
i8`Vv7LF
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M|6A0m#Q
{ [.m`+
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Yb+yw_5
{ \wo?47+=
CAboutDlg dlgAbout;
>[MX:Yh
dlgAbout.DoModal(); `)`
n(B
} n.T&}ZPz\v
else ,#Iu
7di
{ EwuO&q
CDialog::OnSysCommand(nID, lParam); >XK
PTC5H
} @*OZx 9
} 6,)[+Bl
Q
7
void CCaptureDlg::OnPaint() (mgS"zPS
{ |y&*MTfV4L
if (IsIconic()) Z8zmHc"IH
{ :QpuO1Gu
CPaintDC dc(this); // device context for painting ]j'p :v
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T@G?t0
// Center icon in client rectangle m=?KZ?U`
int cxIcon = GetSystemMetrics(SM_CXICON); (0j}-iaQEZ
int cyIcon = GetSystemMetrics(SM_CYICON); s@9vY\5[9
CRect rect; #i@;J]x(
GetClientRect(&rect); gGr^@=;YC
int x = (rect.Width() - cxIcon + 1) / 2; |k+8<\
int y = (rect.Height() - cyIcon + 1) / 2; ?,p;O
// Draw the icon +,2:g}5
dc.DrawIcon(x, y, m_hIcon); plUZ"Tr
} M\sN@+
else ]+(6,ct&.
{ mFg<dTx0c8
CDialog::OnPaint(); `!XY]PI+e
} 'h/C oTk@,
} ad.3A{
=x!2Ak/)
HCURSOR CCaptureDlg::OnQueryDragIcon() .uuO>:
{ /s?r`' j[
return (HCURSOR) m_hIcon; %`OJ.:k
} 3|WWo1
!u_Y7i3^
void CCaptureDlg::OnCancel() }lh I\q
{ &S( .GdEf
if(bTray) VSrr`B
DeleteIcon(); }2<r,
CDialog::OnCancel(); Anscr
} [K9'<Qnu
KAC6Snu1
void CCaptureDlg::OnAbout() IOb*GTb
{ :E_g"_
CAboutDlg dlg; x97
j
dlg.DoModal(); 9;_sC
} 1nQWW9i
|(pRaiJ
void CCaptureDlg::OnBrowse() &{>cZh}\
{ S'A>2>
CString str; P/c&@_b
BROWSEINFO bi; JQ,1D`?.a
char name[MAX_PATH]; [ JpKSTg[
ZeroMemory(&bi,sizeof(BROWSEINFO)); `&KwtvkdI
bi.hwndOwner=GetSafeHwnd(); vY%d
bi.pszDisplayName=name; LA@w:Fg
bi.lpszTitle="Select folder"; <%maDM^_\(
bi.ulFlags=BIF_RETURNONLYFSDIRS; 3D`YZ#M
LPITEMIDLIST idl=SHBrowseForFolder(&bi); \]=7!RQ\
if(idl==NULL) '`eO\huf
return; |p><'Q%*
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); dik:4;
str.ReleaseBuffer(); 4"{ooy^Q
m_Path=str; 2ggdWg7z
if(str.GetAt(str.GetLength()-1)!='\\') 0o+6Q8q
m_Path+="\\"; y9_K, g
UpdateData(FALSE); V\u>"3BQw
} 9:,V5n=
J13>i7]L%
void CCaptureDlg::SaveBmp() hJDi7P
{ :Qumb
CDC dc; >iD )eB
dc.CreateDC("DISPLAY",NULL,NULL,NULL); pV20oSJNt
CBitmap bm; sA'6ty
int Width=GetSystemMetrics(SM_CXSCREEN); --HF8_8;'
int Height=GetSystemMetrics(SM_CYSCREEN); c.,2GwW
bm.CreateCompatibleBitmap(&dc,Width,Height); NXNY"r7~
CDC tdc; lmfi
tdc.CreateCompatibleDC(&dc); I3,= 0z
CBitmap*pOld=tdc.SelectObject(&bm); @r#v[I
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .Jt[(;
tdc.SelectObject(pOld); $/.zm;D
BITMAP btm; lD"(MQV@0
bm.GetBitmap(&btm); uM_#
DWORD size=btm.bmWidthBytes*btm.bmHeight; iTag+G4*
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "kMguK}c
BITMAPINFOHEADER bih; q>mE<
(-M
bih.biBitCount=btm.bmBitsPixel; W6"v)Jc>_
bih.biClrImportant=0; 3
|hHR
bih.biClrUsed=0; qxFB%KqU
bih.biCompression=0; eU<]o<
\Qo
bih.biHeight=btm.bmHeight; O+?<h{"
bih.biPlanes=1; o3I Tr';
bih.biSize=sizeof(BITMAPINFOHEADER); fRtUvC-#H
bih.biSizeImage=size; O)ME"@r@:
bih.biWidth=btm.bmWidth; 'h^0HE\~p
bih.biXPelsPerMeter=0; MxGu>r
bih.biYPelsPerMeter=0; }z\_;\7
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9T|IvQK8
static int filecount=0; RA G3o-
CString name; qQ"Fv|]~>
name.Format("pict%04d.bmp",filecount++); NR -!VJQ
name=m_Path+name; mf}O-Igte
BITMAPFILEHEADER bfh; t?9v^vFR
bfh.bfReserved1=bfh.bfReserved2=0; Q\cjPc0y
bfh.bfType=((WORD)('M'<< 8)|'B'); ~.UrL(l=
bfh.bfSize=54+size; 4eikLRD,
bfh.bfOffBits=54; 5dB'&8DX
CFile bf; <5NF;
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ))&;}2{
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m|=H#
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); q{t*34R
bf.WriteHuge(lpData,size); NX|v=
bf.Close(); [k6nW:C
nCount++; [ {
bV4
} ADpmvW f?
GlobalFreePtr(lpData); du)~kU>l
if(nCount==1) jBU4F~1y
m_Number.Format("%d picture captured.",nCount); P@,nA41,j
else KuMF^0V%c
m_Number.Format("%d pictures captured.",nCount); |1b_3?e
UpdateData(FALSE); Gm(b/qDDe
} b@S Cn9
);Z1a&K5k
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Sh?4ri@:
{ q-c=nkN3
if(pMsg -> message == WM_KEYDOWN) B<~ NS)w
{ {K9/HqH
if(pMsg -> wParam == VK_ESCAPE) ,4ei2`wV
return TRUE; U7I qST
if(pMsg -> wParam == VK_RETURN) ~ug=
{b
return TRUE; w9o^s5n
} 'JNElXqrv
return CDialog::PreTranslateMessage(pMsg); 7oq[38zB
} %K>.lh@
D<Zp!J1o
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) # g_Bx
{ jcI&w#re
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (y M^
SaveBmp(); BM(]QUxRd
return FALSE; sgO'wXcoP
} dw TMq*e
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jLpc
Zb,
CMenu pop; de>v
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "R3d+p
CMenu*pMenu=pop.GetSubMenu(0); =e8bNg
pMenu->SetDefaultItem(ID_EXITICON);
2'5 ]~
CPoint pt; vq!_^F<
GetCursorPos(&pt); 7f~Sf
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _L@2_#h!
if(id==ID_EXITICON) '
4ER00
DeleteIcon(); 1P(|[W1
else if(id==ID_EXIT) ,}:G\u*Fu
OnCancel(); wbe<'/X+
return FALSE; q+[SbG&
} +e-G,%>9
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :"l-KQ0
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ND5`Q"k
AddIcon(); vmLxkjUm#
return res; ]ix!tb.Q
} r" K':O6y
4WE6fJ2X
void CCaptureDlg::AddIcon() ZvUCI8
{ &R$CZU
NOTIFYICONDATA data; }=|!:kiE
data.cbSize=sizeof(NOTIFYICONDATA); <ERB.d!
CString tip; H<QT3RF2
tip.LoadString(IDS_ICONTIP); h(F<h_
data.hIcon=GetIcon(0); @]![o %
data.hWnd=GetSafeHwnd(); bcAvM;
strcpy(data.szTip,tip); \'M3|w`f
data.uCallbackMessage=IDM_SHELL; ~u.T- 0F
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6:]*c[7
data.uID=98; 06Gt&_Q
Shell_NotifyIcon(NIM_ADD,&data); JKX_q&bUw
ShowWindow(SW_HIDE); w=}uwvn NX
bTray=TRUE; Nr0
(E
} 9{$'S4
HFq m6|
void CCaptureDlg::DeleteIcon() 7^M9qTEHp
{ Q//,4>JKf
NOTIFYICONDATA data; #BQ.R,
data.cbSize=sizeof(NOTIFYICONDATA); OKHX)"j\\
data.hWnd=GetSafeHwnd(); Cn_$l>
data.uID=98; <BW[1h1k5_
Shell_NotifyIcon(NIM_DELETE,&data); -kS~xVS|
ShowWindow(SW_SHOW); zz^F
k&
SetForegroundWindow(); >5wx+n)/)
ShowWindow(SW_SHOWNORMAL); 1pCieTz!PN
bTray=FALSE; iL=
m{
} 3&x-}y~sg
@m?QR(LJ
void CCaptureDlg::OnChange() ~Aq5XI%i
{ St<mDTi
RegisterHotkey(); :iiw3#]
} =E&OuX-R
(Z}>1WRju
BOOL CCaptureDlg::RegisterHotkey() }@+NN
?P
{ 2..,Sk
UpdateData(); [DHoGy,P
UCHAR mask=0; ?+c`]gO7N
UCHAR key=0; ,+;:3gRk9
if(m_bControl) +x]9+D&
mask|=4; >23-
if(m_bAlt) Uu 7dSU
mask|=2; ~Z ~v
if(m_bShift) Wy]^Ub gW
mask|=1; ICB~_O5
key=Key_Table[m_Key.GetCurSel()]; 6r"u$i`o
if(bRegistered){ aS}1Q?cU
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?4CNkk=v
bRegistered=FALSE; hSGb-$~F
} ]l~Vi_c
cMask=mask; ,uz ]V1
cKey=key; 8wH.et25k
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -;;Z 'NM;8
return bRegistered; %g]vxm5?
} '<iK*[NW
INSkgOo
四、小结 :
t$l.+B
8_H=^a>2
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。