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:
ukEJ D3i
g[1>|Ax`' 一、实现方法
=E]tEi $;G<!]& s 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
He'VqUw_ Jh=.}FXnjL #pragma data_seg("shareddata")
l$\B>u,> HHOOK hHook =NULL; //钩子句柄
N,rd= m+ UINT nHookCount =0; //挂接的程序数目
3{|~'5* static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
1!G}*38; static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
,(Zxd4?y static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
; 8DtnnE static int KeyCount =0;
2"Wq=qy\J static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
q MrM^ ~ #pragma data_seg()
Z;a)P.l.> ,M?8s2? 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。
u8KQV7E Dt[+HCCY: 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:
LH_H
yP_ |[iO./zP BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
4GF3.?3 cKey,UCHAR cMask)
"Zhh>cz {
)uOtQ0 BOOL bAdded=FALSE;
#GlFm?/6K/ for(int index=0;index<MAX_KEY;index++){
+em!TO if(hCallWnd[index]==0){
68h1Wjg:"! hCallWnd[index]=hWnd;
Mz(?_7 HotKey[index]=cKey;
S-o)d HotKeyMask[index]=cMask;
P HOngn bAdded=TRUE;
q x1Js3% KeyCount++;
j>;1jzr2} break;
-ak.wwx\ }
2bTS,N/> }
|3E|VGm~ return bAdded;
!Whx^B: }
K) //删除热键
*,CJ 3<> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lMu9Dp {
9y&;6V.' BOOL bRemoved=FALSE;
bj@R[!ss for(int index=0;index<MAX_KEY;index++){
$8U$.~v if(hCallWnd[index]==hWnd){
m-\_L=QzM if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
^j${#Q hCallWnd[index]=NULL;
F*#!hWtb HotKey[index]=0;
mMXDzAllB HotKeyMask[index]=0;
KzV|::S^ bRemoved=TRUE;
q?mpvpLG KeyCount--;
eq%cRd]u break;
xS%&l)dT }
:3R3>o6m }
O>hh }
OET/4(C return bRemoved;
~D}fy }
Ew{*)r)m *&Iv Eu w=(dJ(7gu DLL中的钩子函数如下:
;`pIq-= H.XyNtJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"}1cQ|0a {
OqMdm~4B!j BOOL bProcessed=FALSE;
/KC^x=Xv: if(HC_ACTION==nCode)
BNE:,I*& {
s?m_zJh if((lParam&0xc0000000)==0xc0000000){// 有键松开
C4ktCN switch(wParam)
4Ol1T(J# {
Hs8JJGXWB case VK_MENU:
3=oxT6"k MaskBits&=~ALTBIT;
fA<os+*9i break;
=J)-#|eZG case VK_CONTROL:
SC%HHu\l MaskBits&=~CTRLBIT;
m%})H"5 break;
/~WBqcl case VK_SHIFT:
z7XI`MZN^ MaskBits&=~SHIFTBIT;
oXht$Q break;
~Azj Y 8 default: //judge the key and send message
9v;[T%% break;
*a\x!c" }
/*fx`0mY) for(int index=0;index<MAX_KEY;index++){
G)NqIur*Z if(hCallWnd[index]==NULL)
6p&2A continue;
( z)#}TC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V*O[8s%5v {
H1q,w|O9j SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
+RM!j9Rq bProcessed=TRUE;
OhN2FkxL }
Ws0)B8y,| }
PE6,9i0ee }
/^jl||'H,: else if((lParam&0xc000ffff)==1){ //有键按下
:oW 16m1` switch(wParam)
XSN=0N!GB {
xbw;s}B case VK_MENU:
q>K3a1x MaskBits|=ALTBIT;
K@2"n|
S; break;
Z-4/xi7 case VK_CONTROL:
zmD7]?| MaskBits|=CTRLBIT;
t+F_/_"B break;
N.Q}.(N0 case VK_SHIFT:
seAPVzWUU MaskBits|=SHIFTBIT;
#+_=(J break;
iuXXFuh default: //judge the key and send message
T zS?WYF break;
,d lq2 }
0/|Ax-dK for(int index=0;index<MAX_KEY;index++){
sl@>GbnS if(hCallWnd[index]==NULL)
JQej$=* continue;
Tr}XG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ep},~tPZn {
V8WSJ=-&
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
B0Z>di: bProcessed=TRUE;
wE<r' }
[+W<;iep }
X-"
+nThMn }
#/H2p`5 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
~;]zEq-hG for(int index=0;index<MAX_KEY;index++){
TUwX4X6m if(hCallWnd[index]==NULL)
N8kNi4$mp= continue;
V'dw=W17V if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m##!sF^k~J SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
KrG,T5 //lParam的意义可看MSDN中WM_KEYDOWN部分
NhTJB7 }
>iG3!Td)y }
HrZX~JnTmf }
:|ahu return CallNextHookEx( hHook, nCode, wParam, lParam );
6XCFL-o- }
Ja&S_'P[ KlS#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:
GB}= dP_bFU zg BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,gG RCp BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
pJ1\@G /+`%u&< 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:
.)bNi*& _4nm h0q4 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
$'eY-U8q {
=6 zK1Z if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
FVL{KNW~i {
!'[?cEog //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
]o=ON95ja SaveBmp();
O
x`K7$) return FALSE;
Sa@'?ApH }
L[nDjQn" …… //其它处理及默认处理
{' 0#<Z }
?VRsgV'$ ]2|fc5G' 4e|N^h*! 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。
{SXSQ '= Val"vUZ 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。
b3 =Z~iLv [MbbL 二、编程步骤
+kE~OdZG (G{S* + 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";
D{y7[#$h$ H =~7g3 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
,=G]tnsv^ dcq18~ 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;
Y}2Sr-@u gE^pOn 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;
3 4%B0 ^LB] 5、 添加代码,编译运行程序。
z'1%%.r;FM %*Mr ^= 三、程序代码
S|@/"?DC N`?/kubD ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
0T(+z)Ki #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
id8QagJ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
=)g}$r
&< #if _MSC_VER > 1000
/|}yf/^9X #pragma once
4]p#9`j #endif // _MSC_VER > 1000
,:'JJZg@ #ifndef __AFXWIN_H__
$-t@=N@vO? #error include 'stdafx.h' before including this file for PCH
/hVwrt( #endif
jC}HNiM78 #include "resource.h" // main symbols
;;Z'd@ class CHookApp : public CWinApp
p"jze3mF {
i_r708ep6 public:
o37oR v] CHookApp();
Pn.DeoHme // Overrides
{=Jo!t;f // ClassWizard generated virtual function overrides
coPdyw'9& //{{AFX_VIRTUAL(CHookApp)
Ck%if public:
Q_iN/F virtual BOOL InitInstance();
-}!mi V virtual int ExitInstance();
OX]P;#4tU //}}AFX_VIRTUAL
BaIuOZ@, //{{AFX_MSG(CHookApp)
s]kzXzRC? // NOTE - the ClassWizard will add and remove member functions here.
cjg~?R // DO NOT EDIT what you see in these blocks of generated code !
M&faa7 //}}AFX_MSG
QT%vrXzz DECLARE_MESSAGE_MAP()
OA\]|2 : };
a.?U$F LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
~Sm6{L BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
]'Ho)Q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
_$D!"z7i BOOL InitHotkey();
h.ftl2> BOOL UnInit();
}KIS_krs #endif
fXl2i]L(^B C%]qK(9vvd //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
I"lzOD; eI #include "stdafx.h"
aTeW#:m #include "hook.h"
@0t[7Nv-1 #include <windowsx.h>
X?< L<:. #ifdef _DEBUG
Qyx~={.C~ #define new DEBUG_NEW
@b^$h:H #undef THIS_FILE
lic-68T static char THIS_FILE[] = __FILE__;
HOPy&Fp #endif
Nz`v+sp #define MAX_KEY 100
r[;d.3jtP #define CTRLBIT 0x04
X;)/<:mX #define ALTBIT 0x02
ceCO *m~ #define SHIFTBIT 0x01
zG 9D
Ph #pragma data_seg("shareddata")
=VZ_';b h HHOOK hHook =NULL;
e?+-~]0 UINT nHookCount =0;
!P^Mo> " static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
@sg.0GR static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
yOKzw~;0% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
zP2X}VLMo static int KeyCount =0;
zYY]+)k? static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
m0v.[61 #pragma data_seg()
M
| "'`zc HINSTANCE hins;
\**j\m void VerifyWindow();
!yrh50tD BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
iZeq
l1O //{{AFX_MSG_MAP(CHookApp)
uSQ#Y^V_ // NOTE - the ClassWizard will add and remove mapping macros here.
#\D74$D // DO NOT EDIT what you see in these blocks of generated code!
[Eu)~J* //}}AFX_MSG_MAP
ZOa| lB (, END_MESSAGE_MAP()
LK}FI*A_ vo*oCfm CHookApp::CHookApp()
zSfUM.fM {
`W~ // TODO: add construction code here,
R0tT4V+ // Place all significant initialization in InitInstance
6G"UXNa, }
e:'56?| qT5"r488 CHookApp theApp;
,&M#[>\(3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
wi
jO2F {
+ls`;f BOOL bProcessed=FALSE;
dz+Dk6"R if(HC_ACTION==nCode)
,~ZD"'*n6g {
,3f>-mP
if((lParam&0xc0000000)==0xc0000000){// Key up
ku]?"{Xx switch(wParam)
URbB2
Bi {
Jx}-Y*
o case VK_MENU:
j_<!y(W MaskBits&=~ALTBIT;
ysIhUpd break;
aHpZhR|f$ case VK_CONTROL:
ZBY2,%nAo MaskBits&=~CTRLBIT;
+> !nqp break;
\$Wpt#V case VK_SHIFT:
'=Lpch2J MaskBits&=~SHIFTBIT;
*kqC^2t break;
t? 6 et1~ default: //judge the key and send message
>jIn&s!} break;
W9tZX5V1 }
Mkk.8AjC| for(int index=0;index<MAX_KEY;index++){
ZM v\j|{8 if(hCallWnd[index]==NULL)
>&S}u\/ continue;
`kQosQV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,z/aT6M?H {
I%a-5f$0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!\BZ_guz bProcessed=TRUE;
t4v'X}7q] }
Q#SQ@oUzD }
$>O~7Nfst7 }
!R\FCAW[x else if((lParam&0xc000ffff)==1){ //Key down
lbIPtu switch(wParam)
XJ3sqcS {
.|R4E case VK_MENU:
`{Q'iydU MaskBits|=ALTBIT;
bK~Toz<k break;
*OFG3 uM
case VK_CONTROL:
&U|c=$!\ MaskBits|=CTRLBIT;
!vR Zh('R break;
b- t case VK_SHIFT:
f?k0(rl MaskBits|=SHIFTBIT;
h L [ eA break;
W>d)( default: //judge the key and send message
%ZWt 45A break;
!a F~5P7% }
~YCH5, for(int index=0;index<MAX_KEY;index++)
o68i0aFW {
T
pF[-fO if(hCallWnd[index]==NULL)
EC,`t*< continue;
*1`X} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QE[<Y3M {
.aY$-Y< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
!KK `+ 9/ bProcessed=TRUE;
Y 2ANt w@ }
I)FFh%m<}a }
/^nIOAeE }
OR~ui[w if(!bProcessed){
fy"}#
2 for(int index=0;index<MAX_KEY;index++){
C){Q;`M-< if(hCallWnd[index]==NULL)
Sf*v#? continue;
13#ff if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;Hk3y+&]a SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(wZ!OLY%} }
qovsM M }
rn*'[i? }
U0j>u*yE return CallNextHookEx( hHook, nCode, wParam, lParam );
qD>^aEd@4 }
mXyP;k ;i6~iLY BOOL InitHotkey()
\M\7k5$ {
klm>/MXI` if(hHook!=NULL){
n
Ab~ nHookCount++;
?}s;,_GH return TRUE;
MBA?, |9Q# }
5>f" else
ZJBb%d1; hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
tjXg if(hHook!=NULL)
ktTP~7UVi nHookCount++;
aHW34e@ebL return (hHook!=NULL);
\~,\| }
*%KIq/V BOOL UnInit()
\Yr*x7! {
d%'#-w' if(nHookCount>1){
B0Wf$
s^7t nHookCount--;
v~L\[&|_ return TRUE;
FJ~d&L\l }
/y-D_ BOOL unhooked = UnhookWindowsHookEx(hHook);
@L!^2v if(unhooked==TRUE){
`~u=[}w nHookCount=0;
cHF W"g78 hHook=NULL;
LsERcjwwK }
p)/e;q^ return unhooked;
/)_4QSz7 }
08nh y[ ,R`CAf%* BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"73y}' {
C+s/KA% BOOL bAdded=FALSE;
X#$ oV# for(int index=0;index<MAX_KEY;index++){
%(eQ1ir + if(hCallWnd[index]==0){
=figat hCallWnd[index]=hWnd;
G`0O5G:1 HotKey[index]=cKey;
<9fXf* HotKeyMask[index]=cMask;
AEyD?^? bAdded=TRUE;
x7zc3%T's KeyCount++;
]z^jz#>um& break;
cl^UFlf[ }
V[/9?5pM }
n&;JW6VQS return bAdded;
.2JZ7 }
}NC$Ce ESV./~K BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
n?r8ZDJ' {
pwfQqPC#_ BOOL bRemoved=FALSE;
}5vKQf for(int index=0;index<MAX_KEY;index++){
4%r?(C0x if(hCallWnd[index]==hWnd){
-1Li&K7 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
C<^i`[&P$ hCallWnd[index]=NULL;
mnM]@8^G HotKey[index]=0;
)?[7}(4jI HotKeyMask[index]=0;
c2g[w;0" bRemoved=TRUE;
" C0[JdZ KeyCount--;
*g+ZXB break;
?`?Tg&W }
ek]JzD~w$ }
#h=V@Dh }
geyCS3
:p return bRemoved;
G)<B7-72; }
Gxe)5,G i`F5 void VerifyWindow()
ZiuD0#"! {
C%yH}T\s for(int i=0;i<MAX_KEY;i++){
o4FHR+u<M if(hCallWnd
!=NULL){ ,byc!P
if(!IsWindow(hCallWnd)){ <<d #
hCallWnd=NULL; A Qjv?
4)T
HotKey=0; R5=J :o
HotKeyMask=0; yP$esDP
KeyCount--; (9%?ik
} =_k
} bDWLHdu
a
} 6Z#Nh@!+C
} 30^q_|l:]
O.Pp*sQ^
BOOL CHookApp::InitInstance() 'Jf
LTG.
{ 85&7WAco"B
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;?HP/dZLz
hins=AfxGetInstanceHandle(); _?"y1L.
InitHotkey(); y60aJ)rAX
return CWinApp::InitInstance(); p)B/(%
} J(#6Cld`c
Nxe1^F33
int CHookApp::ExitInstance() fu\j
{ +C!GV.q[
VerifyWindow(); Q|o$^D,
UnInit(); :&
Dv!z
return CWinApp::ExitInstance(); kfas4mkc
} *.nSv@F
aWTurnee^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file
ZJs~,Q
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) D1y`J&A>Q
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^?Xs!kJP
#if _MSC_VER > 1000 bxh-#x
&
#pragma once <1I4JPh>x
#endif // _MSC_VER > 1000 f{VV U/$
H3$py|}lL
class CCaptureDlg : public CDialog A!!!7tj
{ Wx-0Ip'9
// Construction k
?KJ8
public: (
xooU 8d
BOOL bTray; X9?)P5h=
BOOL bRegistered; MUl7o@{'
BOOL RegisterHotkey(); e]1'D
UCHAR cKey; o7E|wS
UCHAR cMask; H}GGUE&c*
void DeleteIcon(); 5T.U=_ag
void AddIcon(); $#f_p-N
UINT nCount; 1#3|PA#>
void SaveBmp(); wyX3qH
CCaptureDlg(CWnd* pParent = NULL); // standard constructor JqO1 a?H
// Dialog Data I;JV-jDM
//{{AFX_DATA(CCaptureDlg) i;{lY1
enum { IDD = IDD_CAPTURE_DIALOG }; '/qy_7O
CComboBox m_Key; d%k7n+ICQ4
BOOL m_bControl; \}h
BOOL m_bAlt; L<=Dl
BOOL m_bShift; E'4Psx9: =
CString m_Path; 4#>Z.sf
CString m_Number; ?0:]%t18
//}}AFX_DATA tx
d0S!
// ClassWizard generated virtual function overrides `Ns@W?
//{{AFX_VIRTUAL(CCaptureDlg) X[Ufq^fyA
public: /v9qrZ$$
virtual BOOL PreTranslateMessage(MSG* pMsg); R/"f
protected: AH n!>w,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O0jOI3/P%
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mhrF9&s
//}}AFX_VIRTUAL %`k [xz
// Implementation U)f('zD
protected: bu6Sp3g
HICON m_hIcon; #b*4v&<
// Generated message map functions jC[_uG
//{{AFX_MSG(CCaptureDlg) Q(-&}cY
virtual BOOL OnInitDialog(); 8>WA5:]v
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); cdkEK
afx_msg void OnPaint(); &o x
afx_msg HCURSOR OnQueryDragIcon(); +pG+ xI
virtual void OnCancel();
t[+bZUS$~
afx_msg void OnAbout(); 2F*>&n&Db7
afx_msg void OnBrowse(); zx<PX
afx_msg void OnChange(); rM.Pc?Z
//}}AFX_MSG kCEuzd=$V
DECLARE_MESSAGE_MAP() ) ??N]V_U
}; ;MNUT,U
#endif c!
kr
BS
fx+_;y
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file KF#^MEw%
#include "stdafx.h" I1m[M?
#include "Capture.h" @P~%4:!Hr
#include "CaptureDlg.h" Pl/Xh03E
#include <windowsx.h> G7CkP
#pragma comment(lib,"hook.lib") b?OA |JqX
#ifdef _DEBUG >k`qPpf&
#define new DEBUG_NEW [ x+-N7
#undef THIS_FILE y'`7zJ
static char THIS_FILE[] = __FILE__; .9e5@@VR
#endif &4evh<z
#define IDM_SHELL WM_USER+1 >3D1:0Sg
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vx.c`/
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X<IW5*
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; oS$7k3s
fj
class CAboutDlg : public CDialog 40MKf/9
{ D$4GNeB+#
public: 'z,kxra|n
CAboutDlg(); \5&Mg81
// Dialog Data ]cP%d-x}
//{{AFX_DATA(CAboutDlg) zAM9%W2v_
enum { IDD = IDD_ABOUTBOX }; @~s5 {4
//}}AFX_DATA dakHH@Q
// ClassWizard generated virtual function overrides ;UgwV/d
//{{AFX_VIRTUAL(CAboutDlg) V
H`_
protected:
9;%$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q e+;BE-H
//}}AFX_VIRTUAL m%u`#67oK
// Implementation f_O|
protected: 8D`+3
//{{AFX_MSG(CAboutDlg) HdtGyh6X0
//}}AFX_MSG l (rm0_
DECLARE_MESSAGE_MAP() i/-IjgM"-
}; Epp>L.?r
.S|T{DMQ[
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ij:a+T
{ `q]' ^EzJ
//{{AFX_DATA_INIT(CAboutDlg) @mZK[*Ak<*
//}}AFX_DATA_INIT nI?*[y}
} p}sM"}Ul
VRY(@# q
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \y?*} L
{ Q 8Ek}O\MC
CDialog::DoDataExchange(pDX); 5@1h^wv
//{{AFX_DATA_MAP(CAboutDlg) *JX$5bZsI
//}}AFX_DATA_MAP
MOB4t|
} ]\K?%z
l=9D!64
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) tH;9"z#
~
//{{AFX_MSG_MAP(CAboutDlg) %8I^&~E1
// No message handlers G"&$7!6[Y
//}}AFX_MSG_MAP l-W)?d
END_MESSAGE_MAP() P=EZ6<c3&
r6\g#}
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DZL(G [
: CDialog(CCaptureDlg::IDD, pParent) :tO?+1
{ uq9mq"
//{{AFX_DATA_INIT(CCaptureDlg) !QAndg{;D
m_bControl = FALSE; !{V`N|0
m_bAlt = FALSE; yx`@f8Kr
m_bShift = FALSE; ='D%c^;O8'
m_Path = _T("c:\\"); OQ2G2>p
m_Number = _T("0 picture captured."); gNxv.6Pp=
nCount=0; >CKa?N;
bRegistered=FALSE; L|APX y]>
bTray=FALSE; r)>'cjx/
//}}AFX_DATA_INIT SE(<(w
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *IbDA
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y<POdbg
} z5({A2q
vh"';L_*37
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #]+BIr`
{ 4d@0v n{
CDialog::DoDataExchange(pDX); M6MxY\uM
//{{AFX_DATA_MAP(CCaptureDlg) rMWvW(@@D
DDX_Control(pDX, IDC_KEY, m_Key); o/,%rA4
DDX_Check(pDX, IDC_CONTROL, m_bControl); 74
ptd,
DDX_Check(pDX, IDC_ALT, m_bAlt); 0P$19TN
DDX_Check(pDX, IDC_SHIFT, m_bShift); XdIno}pN
DDX_Text(pDX, IDC_PATH, m_Path); 8bMw.u=F
DDX_Text(pDX, IDC_NUMBER, m_Number); m8L %!6o
//}}AFX_DATA_MAP \4$Nx/@Q}
} ?~.9:93
E l.eK9L
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) oIOeX1$V
//{{AFX_MSG_MAP(CCaptureDlg) B> i^ w1
ON_WM_SYSCOMMAND() N%:uOX8{
ON_WM_PAINT() Hh](n<Bs
ON_WM_QUERYDRAGICON() kKbbsB
ON_BN_CLICKED(ID_ABOUT, OnAbout) H4v%$R;K
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `4@`G:6BL
ON_BN_CLICKED(ID_CHANGE, OnChange) :,H_
e!
X
//}}AFX_MSG_MAP |U1u:=[
END_MESSAGE_MAP() 5C*Zb3VG4
p({|=+bl
BOOL CCaptureDlg::OnInitDialog() !#]kzS0
{ EX<1hAw
CDialog::OnInitDialog(); o>]w76A^(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]igCV
ASSERT(IDM_ABOUTBOX < 0xF000); "e\73?P
CMenu* pSysMenu = GetSystemMenu(FALSE); E.$//P n|1
if (pSysMenu != NULL) @:hWahMy
{ W{ozZuo
CString strAboutMenu; .-s!} P"
strAboutMenu.LoadString(IDS_ABOUTBOX); Qh3+4nLFtb
if (!strAboutMenu.IsEmpty()) )I<VH+6
{ |'i ?o
pSysMenu->AppendMenu(MF_SEPARATOR); Jnt
r"a-4
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tMf5TiWu@
} K'e!BZm6Q
} "[A&S!
SetIcon(m_hIcon, TRUE); // Set big icon [uie]*^
SetIcon(m_hIcon, FALSE); // Set small icon j }^?Snq
m_Key.SetCurSel(0); _mdJIa0D6k
RegisterHotkey(); jkuNafp}
CMenu* pMenu=GetSystemMenu(FALSE); ) tV]h#4
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !Y^$rF-+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &e[Lb:Uk)
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hhjsg?4uL
return TRUE; // return TRUE unless you set the focus to a control *X|%H-Q:H`
} .q]K:}9!\
FGwgSrXL7
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,V4pFQzL
{ QKz2ONV=)
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q(8W5Fb?
{ c$A}mL_
CAboutDlg dlgAbout; e!i.u'z
dlgAbout.DoModal(); ?1]B(V9nBq
} ,aWfGh#$
else nYRD>S?uz
{ <N80MUL|
CDialog::OnSysCommand(nID, lParam); g5Hsz,x
} 0\$Lnwp_
} :]C\DUBo
[MC}zd'/
void CCaptureDlg::OnPaint() 8^-g yx'
{ Z.>?Dt
if (IsIconic()) !})3Fb
{ I$i1o#H
CPaintDC dc(this); // device context for painting Pt;\]?LVrD
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); mW_A3S5
// Center icon in client rectangle Q%GLT,f1.
int cxIcon = GetSystemMetrics(SM_CXICON); ^eYJ7&t
int cyIcon = GetSystemMetrics(SM_CYICON); DUm/0q&
CRect rect; W\DJXM]b
GetClientRect(&rect); &zP\K~Nt
int x = (rect.Width() - cxIcon + 1) / 2; m}
=<@b:l
int y = (rect.Height() - cyIcon + 1) / 2; [qt^gy)
// Draw the icon v#sx9$K T
dc.DrawIcon(x, y, m_hIcon); ^T@-yys
} zgpPu4t
else VKrKA71Z~
{ Z3T26Uk
CDialog::OnPaint(); 7xT<|3 I
} p@znmn-
} ^h|'\-d\
2gjA>ET`N
HCURSOR CCaptureDlg::OnQueryDragIcon() 483vFLnF
{ QaEXk5>e
return (HCURSOR) m_hIcon; KQqQ@D&n
} tX}Fb0y
=WP}RZ{S
void CCaptureDlg::OnCancel() m7mC
7x
{ }KkH7XksF
if(bTray) F{<rIR
DeleteIcon(); }@A~a`9g
CDialog::OnCancel(); 6Ue6b$xE
} t!Av[K
Vk~}^;`Y
void CCaptureDlg::OnAbout() G}~b
{ *JOv
CAboutDlg dlg; q`;URkjk
dlg.DoModal(); J.`.lQ$z
} *XzUqK
u09OnP\
void CCaptureDlg::OnBrowse() kp;MNRc
{ Z#W`0G>'
CString str; L,X6L @Q
BROWSEINFO bi; I3aEg
char name[MAX_PATH]; +~/zCJ;F
ZeroMemory(&bi,sizeof(BROWSEINFO)); \J\1i=a-=
bi.hwndOwner=GetSafeHwnd(); pK1(AV'L
bi.pszDisplayName=name; |s`q+ U -
bi.lpszTitle="Select folder"; m
:^,qC
bi.ulFlags=BIF_RETURNONLYFSDIRS; Ox43(S0~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); )5V1HWjU
if(idl==NULL) CILk
return; %F/tbXy{
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'Ph;:EMj
str.ReleaseBuffer(); )I}G:bBa
m_Path=str; If#7SF)n'
if(str.GetAt(str.GetLength()-1)!='\\') 1X9sx&5H
m_Path+="\\"; n2O7n@8
UpdateData(FALSE); C,z]q$4
} wLUmRo56aR
>zhbipA
void CCaptureDlg::SaveBmp() 3i$AR
{ rC*n Z*
CDC dc; |$ 0/:*
dc.CreateDC("DISPLAY",NULL,NULL,NULL); S I(8.$1
CBitmap bm; )*JTxMQ
int Width=GetSystemMetrics(SM_CXSCREEN); ;~q)^.K3
int Height=GetSystemMetrics(SM_CYSCREEN); O@Kr}8^,
bm.CreateCompatibleBitmap(&dc,Width,Height); Ua3ERBX{
CDC tdc; BR%: `uiQ<
tdc.CreateCompatibleDC(&dc); (c_hX(
CBitmap*pOld=tdc.SelectObject(&bm); ^
pR&
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2I4P":q
tdc.SelectObject(pOld); 1-[{4{R
BITMAP btm; ( jyJ-qe
bm.GetBitmap(&btm); MR6vr.~
DWORD size=btm.bmWidthBytes*btm.bmHeight; U)o8Tr
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4'8.f5
BITMAPINFOHEADER bih; / q!&I
bih.biBitCount=btm.bmBitsPixel; @<sP1`1
bih.biClrImportant=0; Z,&ywMm/G
bih.biClrUsed=0; 5LK>n-
bih.biCompression=0; ]-`{kX
bih.biHeight=btm.bmHeight; \%VoX`B
bih.biPlanes=1; g?+P&FL#I
bih.biSize=sizeof(BITMAPINFOHEADER); ?{dno=
bih.biSizeImage=size; +]_} \
bih.biWidth=btm.bmWidth; Zj0&/S
bih.biXPelsPerMeter=0; fjJIF%
bih.biYPelsPerMeter=0; *Ee# x!O
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %qv7;E2C
static int filecount=0; zC^Ib&gm>,
CString name; g/yXPzLU
name.Format("pict%04d.bmp",filecount++); cK } Qu
name=m_Path+name; D.GSl
BITMAPFILEHEADER bfh; u!S{[7 FY
bfh.bfReserved1=bfh.bfReserved2=0; K&h|r`W(
bfh.bfType=((WORD)('M'<< 8)|'B'); _[7uLWyC9
bfh.bfSize=54+size; ;Os3
!
bfh.bfOffBits=54; <Jk|Bmw;
CFile bf; _B[(/wY
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yiU dUw/
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); uQNoIy J)
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1WKDG~
bf.WriteHuge(lpData,size); W2k~N X#@
bf.Close(); YD%Kd&es
nCount++; +Lr0i_al
} ~}11 6K
GlobalFreePtr(lpData); .PxM
#;i2
if(nCount==1) _Owz%
m_Number.Format("%d picture captured.",nCount); nNKL{Hp
else :U>
oW97l
m_Number.Format("%d pictures captured.",nCount); XDGZqkt
UpdateData(FALSE); ]9:G3vq
} '37b[~k4
:[&X*bw[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /_|1,x-Kx
{ ?~{xL"
if(pMsg -> message == WM_KEYDOWN) ^b#E%Rd
{ ]=3O,\
if(pMsg -> wParam == VK_ESCAPE) J @fE")
return TRUE; 4SrK]+|
if(pMsg -> wParam == VK_RETURN) ^s*} 0
return TRUE; )wRD
} {1+H\(v
return CDialog::PreTranslateMessage(pMsg); pf_ /jR
} UTt#ltun ?
Id0F2 [
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AQ5v`xE4
{ ao!r6:&v$e
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5 $J
SaveBmp(); @6SSk=9_S
return FALSE; F8I<4S
} @n(In$
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^q`*!B9@
CMenu pop; Vmc)or*#
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $%-?S]6)
CMenu*pMenu=pop.GetSubMenu(0); Ymu=G3-
pMenu->SetDefaultItem(ID_EXITICON); 11sW$@xs
9
CPoint pt; $\
'\@3o
GetCursorPos(&pt); p3o?_ !Z
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _u>>+6,p
if(id==ID_EXITICON) :6+~"7T
DeleteIcon(); u"jnEKN0y
else if(id==ID_EXIT) qu%s 7+
OnCancel(); /["T#`
return FALSE; ^d*>P|n*@e
} ,Mc2dhq
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Mm!saKT%
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8E+l;2
AddIcon(); jlBCu(.,_
return res; 3@L%#]xwi
} Cs{f'I
h~p}08
void CCaptureDlg::AddIcon() jHCKV
{ rzHa&:Y
NOTIFYICONDATA data; F e.*O`
data.cbSize=sizeof(NOTIFYICONDATA);
P+0xi
CString tip; [4j;FN Fa
tip.LoadString(IDS_ICONTIP); s_LSsyqo
data.hIcon=GetIcon(0); A\)X&vR[6
data.hWnd=GetSafeHwnd(); 3#[I_
strcpy(data.szTip,tip); YP,PJnJU8
data.uCallbackMessage=IDM_SHELL; t^5_;sJQ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; p/~kw:I
data.uID=98; N3<Jh
Shell_NotifyIcon(NIM_ADD,&data); aw1J#5j`n
ShowWindow(SW_HIDE); M'iKk[Hjfx
bTray=TRUE; ~@a
R5Q>us
} +kL(lBv'
dk/*%a
+
void CCaptureDlg::DeleteIcon() `t&;Yk]-L
{ H)Ge#=;ckQ
NOTIFYICONDATA data; P;&p[[7
data.cbSize=sizeof(NOTIFYICONDATA); N~jQ!y
data.hWnd=GetSafeHwnd(); 5nAF =Bj
data.uID=98; [)~@NN
Shell_NotifyIcon(NIM_DELETE,&data); 1.uQ(>n
ShowWindow(SW_SHOW); su;S)yZb
SetForegroundWindow(); a7G2C oM8
ShowWindow(SW_SHOWNORMAL); di2=P)3
bTray=FALSE; KCE-6T
} |$2N$6\SP
Vz]=J;`Mz
void CCaptureDlg::OnChange() C:MGi7f
{ x~^I/$
RegisterHotkey(); |81N/]EER
} 6~WE#z_
ycD.:w p\'
BOOL CCaptureDlg::RegisterHotkey() YCO:bBmp:
{ W2qQKv
UpdateData(); w lg#c6#q
UCHAR mask=0; QL18MbfqP
UCHAR key=0; )fc"])&8
if(m_bControl) :w%bw\}
mask|=4; q)+n2FM
if(m_bAlt) :OaQq@V
mask|=2; n9!3h ?,g
if(m_bShift) [)>8z8'f
mask|=1; mp3_n:R?
key=Key_Table[m_Key.GetCurSel()]; x)ZH;)
if(bRegistered){ }Xv1KX'
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1iL
xXd
bRegistered=FALSE; }F6b ]
} G| oG:
cMask=mask; )%w8>1}c
cKey=key; %nf=[f
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g8A{aHb1}
return bRegistered; !13
/+ u
} u#k,G`
AiK4t-
四、小结 iGVb.=)
#-j!
;?
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。