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:
'=eVem=
0F.S[!I 一、实现方法
<@lj\, 6L)7Q0Z 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:
H/.UDz N1.fV - #pragma data_seg("shareddata")
0{u%J%; HHOOK hHook =NULL; //钩子句柄
NjPQT9&3h UINT nHookCount =0; //挂接的程序数目
Pjxj$>&;*j static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Mz86bb^J static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
VvT7v] static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
F,Ve, 7kh static int KeyCount =0;
Ix<!0!
vk static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
UoUQ6Ij #pragma data_seg()
TtH!5{$s #sk~L21A 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。
l;&kX6 w =''b `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:
{oR@'^N `M(st%@n BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
cV_-Bcb cKey,UCHAR cMask)
wAJ=rRI {
Bk^o$3# BOOL bAdded=FALSE;
F S$8F for(int index=0;index<MAX_KEY;index++){
^~6gkS
} if(hCallWnd[index]==0){
iq^;c syKb hCallWnd[index]=hWnd;
Koj9]2<0 HotKey[index]=cKey;
}Z t#OA
$ HotKeyMask[index]=cMask;
z-:>[Sn bAdded=TRUE;
&49WfctT KeyCount++;
yy[ Y= break;
YU!s;h }
BjA$^ i|8 }
#K/JU{" return bAdded;
y~wr4Q= }
Hl'AnxE //删除热键
4sW~7:vU BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:z *jl'L {
x9S9%JG : BOOL bRemoved=FALSE;
z#rp8-HUDS for(int index=0;index<MAX_KEY;index++){
OVc)PMp if(hCallWnd[index]==hWnd){
k#7A@Vb if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
euW hCallWnd[index]=NULL;
FC||6vJth HotKey[index]=0;
SJlE!MK HotKeyMask[index]=0;
ULgp]IS bRemoved=TRUE;
{"2CI^!/U. KeyCount--;
)[r=(6?n break;
lV$#>2Hh5 }
qZ
+K4H }
WK@<# }
}TAG7U* return bRemoved;
ez)Ks` }
RCxwiZaf33 0&b;!N!vJ N8x.D-=gG DLL中的钩子函数如下:
fO
.=i1
E} D*?LcxX LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
G;/l[mvh, {
M%W#0 BOOL bProcessed=FALSE;
7s!rer> if(HC_ACTION==nCode)
}$r]\v {
N93R(x)% if((lParam&0xc0000000)==0xc0000000){// 有键松开
jW-;Y/S switch(wParam)
412E7 {
DyA/!%g case VK_MENU:
]mUt[Yy:z MaskBits&=~ALTBIT;
fny6`_O break;
;sq xFF@ case VK_CONTROL:
zK{} MaskBits&=~CTRLBIT;
6Z2|j~ break;
9_e_Ne`i`? case VK_SHIFT:
q">}3`k MaskBits&=~SHIFTBIT;
(/!@
-]1 break;
~C>Q+tR8 default: //judge the key and send message
_-^mxC|M break;
+Ar4X-A{y }
K[
S>EITr for(int index=0;index<MAX_KEY;index++){
+DR{aX/ll if(hCallWnd[index]==NULL)
}gB^C3b6 continue;
;ceg:-Zqo if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
l~Ka(*[!U {
Dhfor+Epy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
6pfkv2.} bProcessed=TRUE;
{XUSw8W' }
kBk2mMZ }
[?;L }
9
`q(_\ x else if((lParam&0xc000ffff)==1){ //有键按下
RrYNtc switch(wParam)
H{Lt,# {
RAws{<6T- case VK_MENU:
}[MkJ21! MaskBits|=ALTBIT;
&-JIXVd*R break;
^N
4Y*NtV7 case VK_CONTROL:
g)D@4RM MaskBits|=CTRLBIT;
x K\i&A break;
w^YXnLLJG case VK_SHIFT:
rKdsVW MaskBits|=SHIFTBIT;
k B4Fz break;
ZM<UiN default: //judge the key and send message
a?PH`5O break;
Y9vVi]4 }
*yo'Nqu for(int index=0;index<MAX_KEY;index++){
p9mGiK4! if(hCallWnd[index]==NULL)
~Fl\c- continue;
D/%v/mpj$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~ _tK.m3 {
OL:hNbw'~T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
4^4T#f2=e bProcessed=TRUE;
B4+c3M\$V }
ua &uR7 }
FeQo,a }
F MYcZ+4 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
rd$T6!I for(int index=0;index<MAX_KEY;index++){
PxvxZJf$@ if(hCallWnd[index]==NULL)
Yl?s^]SFU continue;
@~N"MsF3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
gTB|IcOs SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
b`^?nD7 //lParam的意义可看MSDN中WM_KEYDOWN部分
;:ZD<'+N }
qQO*:_ezzk }
99,=dzm }
D!Nc&|X^ return CallNextHookEx( hHook, nCode, wParam, lParam );
MPyDG"B * }
-eS r 9f5~hBlo 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:
1&7?f DB_oRr[oj BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(b&Z\?" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~|ZAS] ,HmGp 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:
_%B,^0;C 3DB= Xh LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
:eB+t`M {
AeN:wOm if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Us2> 5 :\ {
,1JQjsR //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
B9cWxe4R# SaveBmp();
t7xJ" return FALSE;
/d Ua }
KbK!4 …… //其它处理及默认处理
<mTo54g }
tx`^'%GMA Zu4CFX-4 DW :\6k 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。
[eTEK W] o_kZ 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。
|Zp')
JiS |UQ[pas 二、编程步骤
FYefn3b .'2I9P\! 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";
-~4kh]7% 2e3AmR@* 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
w
T_l>u 42-T&7k 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;
-;qK_x p-rQ'e 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;
[C~N#S[] Nt?=0X|M 5、 添加代码,编译运行程序。
r;H#cMj Q`Pe4CrWvu 三、程序代码
+u\w4byl (dO0`wfM ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
V|HO*HiB3 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
(I>S qM
Y #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
|o(te #if _MSC_VER > 1000
US9@/V*2 #pragma once
2_?VR~mA# #endif // _MSC_VER > 1000
}XpZgd$ #ifndef __AFXWIN_H__
,+gtr. #error include 'stdafx.h' before including this file for PCH
aYHs35 #endif
}S13]Kk?= #include "resource.h" // main symbols
<8Zs;>YuK class CHookApp : public CWinApp
een62-` {
^(7l! public:
rd[mC[
r CHookApp();
j>v8i
bS( // Overrides
{CVZ7tU7] // ClassWizard generated virtual function overrides
,lFzL3'_0x //{{AFX_VIRTUAL(CHookApp)
'X/:TOk{W public:
|Dq?<Ha virtual BOOL InitInstance();
Ju;^^ virtual int ExitInstance();
]_|%!/_ //}}AFX_VIRTUAL
J<Ki;_=I //{{AFX_MSG(CHookApp)
O(.eHZ= // NOTE - the ClassWizard will add and remove member functions here.
|gINB3L // DO NOT EDIT what you see in these blocks of generated code !
qxZf!NX5 //}}AFX_MSG
P# 8lO%; DECLARE_MESSAGE_MAP()
8+(wAbp };
Tgi7RAY LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
78?{;iNv BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
L6!Hv{ijn BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{c drMP@"" BOOL InitHotkey();
K!E\v4 BOOL UnInit();
p_apVm\t_ #endif
$~
d6KFT wXBd"]G)C //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
CR#-!_=4 #include "stdafx.h"
I{%(G( #include "hook.h"
~HtD]|7 #include <windowsx.h>
JEZ0O&_R #ifdef _DEBUG
n>SK2` #define new DEBUG_NEW
[<f9EeziB #undef THIS_FILE
$I ,Np)i static char THIS_FILE[] = __FILE__;
Ze[\y(K! #endif
Jk{v(W# #define MAX_KEY 100
G#uB%:)&0u #define CTRLBIT 0x04
jC?l :m? #define ALTBIT 0x02
EF=5[$
u #define SHIFTBIT 0x01
07ppq?,y #pragma data_seg("shareddata")
7nW <kA HHOOK hHook =NULL;
^d(gC%+!u UINT nHookCount =0;
.O+,1&D5 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
)QnsRW{D" static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
g0;6}n static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
j^f54Ky. static int KeyCount =0;
/@DJf\`vM static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
YuzVh9jTI #pragma data_seg()
l6IT o@&J HINSTANCE hins;
]}]+aB void VerifyWindow();
R7FI{A BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
u-V(
2? //{{AFX_MSG_MAP(CHookApp)
_l,-SQgj // NOTE - the ClassWizard will add and remove mapping macros here.
mOLz(0 // DO NOT EDIT what you see in these blocks of generated code!
-ni@+Dy //}}AFX_MSG_MAP
%)&Tr` END_MESSAGE_MAP()
;LKYA?=/V x&EMg! CHookApp::CHookApp()
rO/Sj<0^ {
W3%RB[s- // TODO: add construction code here,
0}9j l // Place all significant initialization in InitInstance
U2Ky4UFm }
%y)hYLOJ i.-2
w6 CHookApp theApp;
{5+69&:G. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?D_}',Wx {
:."+&gb BOOL bProcessed=FALSE;
yy3`E}vX7 if(HC_ACTION==nCode)
yaHkWkl
= {
?TmVLny if((lParam&0xc0000000)==0xc0000000){// Key up
%?S[{ 4A& switch(wParam)
v+<4?]EJ {
\3F)M`g case VK_MENU:
bIV9cpW MaskBits&=~ALTBIT;
}R hSt] break;
l$W)Vk<B(T case VK_CONTROL:
?1eu9; q\* MaskBits&=~CTRLBIT;
r,L`@A=v break;
jpMMnEVj6P case VK_SHIFT:
7+6I~&x!Lz MaskBits&=~SHIFTBIT;
M}=fdH break;
uY3#, default: //judge the key and send message
2Z`Jr/ break;
"tA.`* }
Pt6d5EIG for(int index=0;index<MAX_KEY;index++){
4>Nig.# if(hCallWnd[index]==NULL)
t+0/$ continue;
]2[\E~^KU if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[V5,1dmkI {
=xb/zu( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/7-FVqDx8 bProcessed=TRUE;
`)BZk[64 }
9wdX#=I }
t0^)Q$ }
IZd~Am3f else if((lParam&0xc000ffff)==1){ //Key down
sLK$H|%>m switch(wParam)
Kc>Rd {
\vW'\} case VK_MENU:
{L M Q MaskBits|=ALTBIT;
)"E1/$*k break;
%GMCyT case VK_CONTROL:
C
MGDg} MaskBits|=CTRLBIT;
+)_DaL
E break;
:8?l=B9("g case VK_SHIFT:
CXi:?6OG MaskBits|=SHIFTBIT;
f\Q_]%^W break;
N)KN!! default: //judge the key and send message
kn&BGYt break;
N[yS heT }
9h6siK(F for(int index=0;index<MAX_KEY;index++)
`vf]C' {
aq(i^d if(hCallWnd[index]==NULL)
Kzwe36O;? continue;
yv$hIU2X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U\[b qw {
G^/8^Zi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_+%p!!
bProcessed=TRUE;
EKmn@S-&P }
"VMb1Zhf }
b.)jJLWv@ }
:n?rk/ F if(!bProcessed){
.j"@7#tW for(int index=0;index<MAX_KEY;index++){
u|Ng>lU if(hCallWnd[index]==NULL)
zq|NltK continue;
]l if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
SUsdX[byb SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
iU#"G" & }
}0OQm?xh }
bhfC2@ }
'\"5qB return CallNextHookEx( hHook, nCode, wParam, lParam );
81)i>] }
@U =~c9 gaE8\JSr BOOL InitHotkey()
[o
6 {
J@ 8OU if(hHook!=NULL){
g}*p(Tp9: nHookCount++;
)k4&S{= return TRUE;
iN5[x{^t }
uME_/S uO else
Z07n>|WF- hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
KJt6d`ZN if(hHook!=NULL)
(:}}p}u nHookCount++;
X 0LC:0+ return (hHook!=NULL);
5BM6Pnle }
q3GkfgY BOOL UnInit()
,lb}&uZo {
)6px5Vwz if(nHookCount>1){
hE4qs~YB! nHookCount--;
^ Qxv5HS2 return TRUE;
5wv7]F< }
! 'Hd:oD< BOOL unhooked = UnhookWindowsHookEx(hHook);
=RofC9, if(unhooked==TRUE){
/9?yw! nHookCount=0;
0XA0b1V X hHook=NULL;
yFTN/MFt }
d?/>Qqw:# return unhooked;
SPtx_+ Q)S }
K4OiKYq =pnQ?2Og BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
x,GLGGi}_x {
p.x2R,CU BOOL bAdded=FALSE;
`9acR>00$ for(int index=0;index<MAX_KEY;index++){
<2OXXQ1 if(hCallWnd[index]==0){
o
ethO hCallWnd[index]=hWnd;
RE08\gNIt HotKey[index]=cKey;
dl3}\o_ HotKeyMask[index]=cMask;
C)%qs] bAdded=TRUE;
s&\krW& KeyCount++;
Qm*X Wo break;
\\`(x:\ }
]q&NO(:kbq }
lLU8eHf\ return bAdded;
}!m}? }
S{,|Fa^PPO ?0lz!Nq'S BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9H+Q/Q*-a {
6LabFX@{& BOOL bRemoved=FALSE;
LbR'nG{J for(int index=0;index<MAX_KEY;index++){
}?sC1]-j& if(hCallWnd[index]==hWnd){
_SU6Bd/> if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Au:R]7 hCallWnd[index]=NULL;
zA/Fh(uX HotKey[index]=0;
3h}i="i HotKeyMask[index]=0;
8U!$()^? bRemoved=TRUE;
d *#.(C9^ KeyCount--;
#J break;
f|~X}R }
b|\dHi2FT }
bo@,
B }
z8xBq%97us return bRemoved;
er3`ITp:dp }
<*oV-A //%#?JJV void VerifyWindow()
6-+wfrN2 {
D/hq~- g for(int i=0;i<MAX_KEY;i++){
m!]J{OGG: if(hCallWnd
!=NULL){ 3{|]@ L
if(!IsWindow(hCallWnd)){ kr-5O0tmf
hCallWnd=NULL; x1Z*R+|>2
HotKey=0; amWKykVS5
HotKeyMask=0; > iYdr/^a
KeyCount--; {$v^2K'C
} L<6nM
;d
} F&
} pX1Us+%
} )c532
y
J5Ti@(G5V
BOOL CHookApp::InitInstance() FOjX,@x&
{ n+nZ;GJ5d
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Fqh./@o
hins=AfxGetInstanceHandle(); (B!DBnq
InitHotkey(); <-,y0Y'
return CWinApp::InitInstance(); '~1Zr uO
} nC)"% Sa
WuTkYiF
int CHookApp::ExitInstance() L$y~\1-
{ lr@w1*
VerifyWindow(); VCvf'$4(X
UnInit(); MZ~N}y
return CWinApp::ExitInstance(); A8Km8"
} 4vCUVo r
XWq"_$&LF
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file d1'= \PYr
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5hTScnL%
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `7[!bCl
#if _MSC_VER > 1000 $9:
@M.
#pragma once O2"V'(
#endif // _MSC_VER > 1000 ew]G@66
7nP{a"4_
class CCaptureDlg : public CDialog W_,7hvE?"H
{ KL$> j/qT
// Construction W>:MK-_J
public: NQqNBI?cr
BOOL bTray; N>1d]DrQR
BOOL bRegistered; ef/43+F^x
BOOL RegisterHotkey(); >Psq" Xj
UCHAR cKey; a2/Mf
UCHAR cMask; fzvyR2 I
void DeleteIcon(); OXn-!J90P
void AddIcon(); #rNc+
UINT nCount; UT[{NltH
void SaveBmp(); $xcZ{C
CCaptureDlg(CWnd* pParent = NULL); // standard constructor {L [
// Dialog Data {JF"PAS7
//{{AFX_DATA(CCaptureDlg) 'yV*eG?^&
enum { IDD = IDD_CAPTURE_DIALOG }; 34nfL: y
CComboBox m_Key; 5fYWuc9}z
BOOL m_bControl; r3KNRr@
BOOL m_bAlt; ai;Q,Vy
BOOL m_bShift; #&1gVkvp
CString m_Path; q03+FLEfC
CString m_Number; Q{an[9To~P
//}}AFX_DATA T8x8TN"
// ClassWizard generated virtual function overrides 1kR. .p<"
//{{AFX_VIRTUAL(CCaptureDlg) IM5[O}aq
public: g:GywXW
virtual BOOL PreTranslateMessage(MSG* pMsg); ;zV<63tW
protected: uX]]wj-R3
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L4bYVTm|
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S4-jF D)U
//}}AFX_VIRTUAL zQ<;3+*
// Implementation nHRk2l|
protected: `(=?k[48
HICON m_hIcon; c]bG5
// Generated message map functions ]lqZ9rO
//{{AFX_MSG(CCaptureDlg) OhlK;hvdB*
virtual BOOL OnInitDialog(); gsl_aW!
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;%^{Zybh
afx_msg void OnPaint(); !hHX8TD^J
afx_msg HCURSOR OnQueryDragIcon(); _*b`;{3
virtual void OnCancel(); jicH 94#(]
afx_msg void OnAbout(); %~8f0B|im
afx_msg void OnBrowse(); S?J(VJqE
afx_msg void OnChange(); pZ3sp!
//}}AFX_MSG T<NOLfk66
DECLARE_MESSAGE_MAP() [-\U)>MY(p
}; .D\oKhV(
#endif 96J]g*o(uU
B692Mn
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file USHQwn)%
#include "stdafx.h" )jg*u}u
0
#include "Capture.h" foL4s;2
#include "CaptureDlg.h" hZ!kh3@:`
#include <windowsx.h> "?lz[K>
#pragma comment(lib,"hook.lib") OEXa}K#
#ifdef _DEBUG {2q0Ko<
#define new DEBUG_NEW 8eYEi
#undef THIS_FILE `%"x'B`mM
static char THIS_FILE[] = __FILE__; &K(y%ieIJ
#endif x%HxM~&
#define IDM_SHELL WM_USER+1 ]<L~f~vU
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c2fSpvz
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B& R?{y*
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 67Qu<9}<-
class CAboutDlg : public CDialog #8ltV`
{ jZ:/d!$S
public: $5&~gHc,
CAboutDlg(); "*N#-=MJF
// Dialog Data $ #2<f 6
//{{AFX_DATA(CAboutDlg) FQ`1c[M@
enum { IDD = IDD_ABOUTBOX }; "Z;({a$v
//}}AFX_DATA mH4u@aQ}
// ClassWizard generated virtual function overrides a1/+C$
oB
//{{AFX_VIRTUAL(CAboutDlg) k;2.g$)W[c
protected: \8s:I+[HH
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pV;0Hcy
//}}AFX_VIRTUAL v ?}0h5
// Implementation $xq04ejJ
protected: OLm@-I*
//{{AFX_MSG(CAboutDlg) n;$u%2 t2
//}}AFX_MSG :N"&o(^
DECLARE_MESSAGE_MAP() qu dY9_
}; [@8 po-()L
kWy@wPqms
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) MPy><J
{ D6+3f#k6
//{{AFX_DATA_INIT(CAboutDlg) 4z26a
//}}AFX_DATA_INIT a?8)47)
} v+`'%E
R5(([C1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) vyB{35p$
{ (v|<"
tv
CDialog::DoDataExchange(pDX); \_6
//{{AFX_DATA_MAP(CAboutDlg) 75R#gQ]EV
//}}AFX_DATA_MAP !MOsP<2
} zUZET'Bm9
5>daWmD
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QjG/H0*mP
//{{AFX_MSG_MAP(CAboutDlg) D %)L"5C
// No message handlers ~{5va
//}}AFX_MSG_MAP nvXjW@)`
END_MESSAGE_MAP() R8eBIJ/@_
Dq$1
j%4Y
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~gGkw#
: CDialog(CCaptureDlg::IDD, pParent) }1~9i'o%Z
{ d;wq@e
//{{AFX_DATA_INIT(CCaptureDlg) js"5{w&
m_bControl = FALSE; )oz2V9X{
m_bAlt = FALSE; &GJVFr~z
m_bShift = FALSE; F;h^o !W7r
m_Path = _T("c:\\"); B)1(
m_Number = _T("0 picture captured."); K[0z$T\
nCount=0; Ql l{;A
bRegistered=FALSE; 5(hv|t/a
bTray=FALSE; v1X[/\;U
//}}AFX_DATA_INIT T4"D&~3
3q
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -PGxG 8S
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S-Vj$asv!
} /F~/&p1<\k
x9a\~XL>a
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %O" Whe
{ K%mR=u#%&
CDialog::DoDataExchange(pDX); Y,Rr[i"j
//{{AFX_DATA_MAP(CCaptureDlg) G)t-W%D&
DDX_Control(pDX, IDC_KEY, m_Key); a`#lYM%(>
DDX_Check(pDX, IDC_CONTROL, m_bControl); `XK\',
}F
DDX_Check(pDX, IDC_ALT, m_bAlt); q oi21mCn
DDX_Check(pDX, IDC_SHIFT, m_bShift); X9]} UX
DDX_Text(pDX, IDC_PATH, m_Path); z},\1^[
DDX_Text(pDX, IDC_NUMBER, m_Number); Wkjp:`(-$r
//}}AFX_DATA_MAP .Wy'
} 4
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Tq?Ai_
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E?P>s T3B
//{{AFX_MSG_MAP(CCaptureDlg) 5V =mj+X?
ON_WM_SYSCOMMAND() r~f;g9I
ON_WM_PAINT() V@-Q&K#
ON_WM_QUERYDRAGICON() xsJXf @
ON_BN_CLICKED(ID_ABOUT, OnAbout) 6vE#$(n#a&
ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
DwGM+)!
ON_BN_CLICKED(ID_CHANGE, OnChange) ;R#RdUFH
//}}AFX_MSG_MAP 6o3#<ap<
END_MESSAGE_MAP() RO/(Ldh
B>!mD{N
BOOL CCaptureDlg::OnInitDialog() JW^ ${4
{ 7g+T
CDialog::OnInitDialog(); 42"nbJ
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); QkD
~
ASSERT(IDM_ABOUTBOX < 0xF000); 0!0e$!8l
CMenu* pSysMenu = GetSystemMenu(FALSE); /(hTk&
if (pSysMenu != NULL) ,f:K)^yD
{ xRXvTNEg
CString strAboutMenu; m[3c,Axl7
strAboutMenu.LoadString(IDS_ABOUTBOX); 83/m^^F{]
if (!strAboutMenu.IsEmpty()) _u$DcA8B
{ ]3f[v:JQ
pSysMenu->AppendMenu(MF_SEPARATOR); &;P\e
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); u^{p'a'
} js <Up/1
} fd>{UyU
SetIcon(m_hIcon, TRUE); // Set big icon -k8sR1(
SetIcon(m_hIcon, FALSE); // Set small icon =d^hiR!GN
m_Key.SetCurSel(0); W&|?8%"l]
RegisterHotkey(); l9a81NF{s
CMenu* pMenu=GetSystemMenu(FALSE); ,-E'059
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Komdz/g
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); pInEB6L.P
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NFEr ,n
return TRUE; // return TRUE unless you set the focus to a control iz`>'wpC
} Jk&!(YK&
SF,:jpt`Z+
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b5^>QzgD
{ XL.f`N.O
if ((nID & 0xFFF0) == IDM_ABOUTBOX) tNzO1BK
{ HB5-B XBU
CAboutDlg dlgAbout; * BR#^Wt
dlgAbout.DoModal(); %~Rg`+
} FP=-
jf/
else Er
j{_i?R?
{ !0Nf`iCQ(
CDialog::OnSysCommand(nID, lParam); i)X~L4gn
} +<F3}]]
} PLs`Ci|`
tR'RB@kJ
void CCaptureDlg::OnPaint() M`'DD-Q
{ 8Z9>h:c1
if (IsIconic()) M NwY
{ j;_
CPaintDC dc(this); // device context for painting ?i#x13
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); JXe~
9/!
// Center icon in client rectangle ly*v|(S&
int cxIcon = GetSystemMetrics(SM_CXICON); H(76sE
int cyIcon = GetSystemMetrics(SM_CYICON); A~a 3bCX+"
CRect rect; mKO~`Wq%@
GetClientRect(&rect); [5p9p1@u{C
int x = (rect.Width() - cxIcon + 1) / 2; j0{`7n
int y = (rect.Height() - cyIcon + 1) / 2; H2:
Zda#
// Draw the icon <af#
C2`B
dc.DrawIcon(x, y, m_hIcon); ,v8e7T
} |w*s:p
else Fd<Ouyxqe
{ 7JQ4*RM
CDialog::OnPaint(); B?8*-0a'[
} w$f_z*/
} /}U)|6-B
Y3:HQ0w`|
HCURSOR CCaptureDlg::OnQueryDragIcon() W)Y`8&,
{ aXVldt'
return (HCURSOR) m_hIcon; WcKDerc
} qX-5/;n
Ah7"qv'L\
void CCaptureDlg::OnCancel() )?#K0o[<
{ @hg[v`~
if(bTray) ~$T>,^K
y
DeleteIcon(); aQx6;PC
CDialog::OnCancel(); /Ls|'2J<$
} zu
@|"f^`
zMP6hn
void CCaptureDlg::OnAbout() W1"NKg~4
{ ff.k1%wr^
CAboutDlg dlg; HLV8_~gQPf
dlg.DoModal(); IL.bwtpQD
} Kj
@<$ChZw
#`|Nm3b
void CCaptureDlg::OnBrowse() V9"R8*@-
{ ig.Z,R3@r
CString str; v;
#y^O
BROWSEINFO bi; v\?J=|S+
char name[MAX_PATH]; uVU)LOx
ZeroMemory(&bi,sizeof(BROWSEINFO)); 7MrHu2rZ=
bi.hwndOwner=GetSafeHwnd(); ma*#*4
bi.pszDisplayName=name; A~vx,|I
bi.lpszTitle="Select folder"; e Fz$h2*B
bi.ulFlags=BIF_RETURNONLYFSDIRS; 4_QfM}Fyp
LPITEMIDLIST idl=SHBrowseForFolder(&bi); t.;._'
if(idl==NULL) =T2SJ)
return; aanS^t0
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @B>D>B
str.ReleaseBuffer(); 7_s+7x =
m_Path=str;
B(s^(__]
if(str.GetAt(str.GetLength()-1)!='\\') 8TB|Y
m_Path+="\\"; m"Mj3Z:
UpdateData(FALSE); r4iNX+h?V
} oZY|o0/9
Ss5@ n
void CCaptureDlg::SaveBmp() =
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{ \ [[xyd
CDC dc; 0g:q%P0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ZJ2
MbV.6
CBitmap bm; jnJ*e-AW
int Width=GetSystemMetrics(SM_CXSCREEN); (N&?Z]|yr
int Height=GetSystemMetrics(SM_CYSCREEN); iKPgiL~
bm.CreateCompatibleBitmap(&dc,Width,Height); m\jjj^f a
CDC tdc; (y!bvp[" m
tdc.CreateCompatibleDC(&dc); :B5*?x
CBitmap*pOld=tdc.SelectObject(&bm); v^o`+~i
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D^%IFwU^
tdc.SelectObject(pOld); X5.9~
BITMAP btm; GBBr[}y-
bm.GetBitmap(&btm); LhAW|];
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3h.,7,T
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); eJ45:]_%I@
BITMAPINFOHEADER bih; N(4y}-w$
bih.biBitCount=btm.bmBitsPixel; }gXhN"
bih.biClrImportant=0; JGvhw,g
bih.biClrUsed=0; 3;Yd"
bih.biCompression=0; qdpi-*2
bih.biHeight=btm.bmHeight; #p*uk
bih.biPlanes=1; L)U*dY
bih.biSize=sizeof(BITMAPINFOHEADER); ER9{D$
bih.biSizeImage=size; BrSvkce
bih.biWidth=btm.bmWidth; C=&n1/
bih.biXPelsPerMeter=0; dcmf~+T
bih.biYPelsPerMeter=0; =6ru%.8U,
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1gBLJ0q
static int filecount=0; jcj8w
CString name; N}n3 +F
name.Format("pict%04d.bmp",filecount++); CQ6I4k
name=m_Path+name; H0"'jd
BITMAPFILEHEADER bfh; J'ce?_\?PY
bfh.bfReserved1=bfh.bfReserved2=0; (S W6?5
bfh.bfType=((WORD)('M'<< 8)|'B'); <v -YMk@
bfh.bfSize=54+size; y(g]:#
bfh.bfOffBits=54; M.y!J
CFile bf; %"(HjanH
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L%$-?O|
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7:LEf"vRZ
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Z|*#)<|~
bf.WriteHuge(lpData,size); l9|K,YVW
bf.Close(); zT)cg$8%fY
nCount++; .>TG{>sH
} Ua|iAD1
GlobalFreePtr(lpData); /hqn>t
if(nCount==1) 5%9Uh'y#
m_Number.Format("%d picture captured.",nCount); Go c*ugR
else %.`u2'^
m_Number.Format("%d pictures captured.",nCount); a_S`$(7k
UpdateData(FALSE); &Cj~D$kDEu
} V]J"v#!{
D<FQVdP
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WynTU?
{ .F@Lx45
if(pMsg -> message == WM_KEYDOWN) en{p<]H
{ bs\kb-\R
if(pMsg -> wParam == VK_ESCAPE) n[!QrEeR},
return TRUE; 4t =Kt
if(pMsg -> wParam == VK_RETURN) Pf4zjc
return TRUE; '"7b;%EN'
} {:"<E?+
return CDialog::PreTranslateMessage(pMsg); vzfMME17
} 25`W"x_
N}VoO0 I
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 53aJnxX
{ q['D?)sy
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ {9Qc\Ij
SaveBmp(); -6-rXD
return FALSE; 3xW:"
} T'7>4MT(
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jEQ_#KKYJ
CMenu pop; wxK71OH
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )vOBF5
CMenu*pMenu=pop.GetSubMenu(0); g,WTXRy
pMenu->SetDefaultItem(ID_EXITICON); T2]8w1l&K
CPoint pt; .?g=mh79(
GetCursorPos(&pt); ku*k+4rz
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qk'&:A
if(id==ID_EXITICON) Y1r'\@L w
DeleteIcon(); ZMMx)}hS
else if(id==ID_EXIT) ec#`9w$
OnCancel(); gh[q*%#
return FALSE; 3O*iv{-&
} *>qc6d@'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z;~%!
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PO'K?hVS^w
AddIcon(); lGp:rw`
return res; 1yF9zKs&_
} Y9f7~w^s
`UzH *w@e
void CCaptureDlg::AddIcon() C[znUI>
{ q7aqbkwz}
NOTIFYICONDATA data; WLU_t65
data.cbSize=sizeof(NOTIFYICONDATA); *^]
CString tip; ~2hzyEh
tip.LoadString(IDS_ICONTIP); Q`J U[nY
data.hIcon=GetIcon(0); "'``O~08/
data.hWnd=GetSafeHwnd(); 1r.2bL*~jw
strcpy(data.szTip,tip); @qcUxu 4
data.uCallbackMessage=IDM_SHELL; 9(HGe+R4o
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @+M1M2@Xz
data.uID=98; \NDW@!X
Shell_NotifyIcon(NIM_ADD,&data); q'H6oD`
ShowWindow(SW_HIDE); |j'@no_rv
bTray=TRUE; DC>?e[oOz
} rr`_\ut
w-)JCdS6Tb
void CCaptureDlg::DeleteIcon() wsrdBxd5
{ 8Wtr,%82
NOTIFYICONDATA data; fl4@5AVY
data.cbSize=sizeof(NOTIFYICONDATA); a0JMLLa [I
data.hWnd=GetSafeHwnd(); |QbCFihn
data.uID=98;
l8+1{6xP
Shell_NotifyIcon(NIM_DELETE,&data); pK{G2]OK{U
ShowWindow(SW_SHOW); Vo{
~D:)
SetForegroundWindow(); jl7>
ShowWindow(SW_SHOWNORMAL); /-lW$.+{?
bTray=FALSE; hA/Es?U]
} +7WpJ;C4
p[WlcbBwT
void CCaptureDlg::OnChange() ZI$P Qz2i
{ X0ugnQ6
RegisterHotkey(); S]fkA6v
} }3Ke
VrT-6r'Y
BOOL CCaptureDlg::RegisterHotkey() U%1M?vT/
{ $ta"Ug.z
UpdateData(); h-Ks:pcR
UCHAR mask=0; 1n2Pr'|s
UCHAR key=0; Bf^K?:r"V
if(m_bControl) Wn;%B].I
mask|=4; |iSwG=&
if(m_bAlt) .u7grC C
mask|=2; v%`k*n':
if(m_bShift) E<B/5g!
mask|=1; m#Z9wf] F
key=Key_Table[m_Key.GetCurSel()]; #+"D?
if(bRegistered){ "\9beK:l
DeleteHotkey(GetSafeHwnd(),cKey,cMask); B"4A1!
bRegistered=FALSE; KTo}xLT
} r#ADxqkaV
cMask=mask; qS}{O0
cKey=key; 1$}Tn
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]x& R=)P
return bRegistered; \mb@-kM)
} H_Hr=_8}-
}|=Fnyj
四、小结 K43`$
S9b=?? M)
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。