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:
dSD7(s!
mSw$?
> 一、实现方法
z,6X{= ewo1^> 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
l5> H\ '7+e!>" #pragma data_seg("shareddata")
qjK'sge/ HHOOK hHook =NULL; //钩子句柄
]BY^.!Y UINT nHookCount =0; //挂接的程序数目
D{Zjo)&tF' static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
X1A~#w> static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
G_fP%ovh static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
'T(7EL3$} static int KeyCount =0;
c$cb2V7, static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
X~aD\%kC7 #pragma data_seg()
_QD##`< -Y*"!8 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。
So?ScX\lG ])d_B\)Kck 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:
w]4=uL6 a(+.rf; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
TRQ@=. cKey,UCHAR cMask)
j@JhxCe1+R {
3GH@|id BOOL bAdded=FALSE;
-h5yg`+1N\ for(int index=0;index<MAX_KEY;index++){
;TaR1e0 if(hCallWnd[index]==0){
z9@Tg=#i hCallWnd[index]=hWnd;
@yBg)1AL HotKey[index]=cKey;
*Q?ZJS~ HotKeyMask[index]=cMask;
iKy_DV;J bAdded=TRUE;
#6XN_< KeyCount++;
byj}36LN62 break;
K#j<G]I( @ }
'baew8Q# }
ubC(%Y_k return bAdded;
{-(}p+;z }
'@Zau\xC //删除热键
}gk37_}X\I BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
()< E?D= {
'cs!(z-{x BOOL bRemoved=FALSE;
4!'1o`8vs for(int index=0;index<MAX_KEY;index++){
G_GPnKdd if(hCallWnd[index]==hWnd){
[@!.( Hp
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
t>D|1E" hCallWnd[index]=NULL;
H%,jB<-.A HotKey[index]=0;
R3nCk-Dq HotKeyMask[index]=0;
m/,.3v bRemoved=TRUE;
7Ao9MF- KeyCount--;
sFqLxSo_I break;
{K\l3_=5qb }
)ZxDfRjL }
RlRkw+%m }
d|GQZAEJEt return bRemoved;
uSZCJ#'G }
3;M7^DM mWOW39Ku t')47k\ DLL中的钩子函数如下:
OE{{,HFa`G 'H"wu
/# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
q^:>sfd {
)tH.P:
1~, BOOL bProcessed=FALSE;
bSOxM/N if(HC_ACTION==nCode)
:}QBrd {
mAycfa if((lParam&0xc0000000)==0xc0000000){// 有键松开
[E9V#J89 switch(wParam)
,EkzBVgo {
^/nj2" case VK_MENU:
.hBq1p
MaskBits&=~ALTBIT;
UKYQ @m break;
W62 $ HI case VK_CONTROL:
XJx$HM&0M MaskBits&=~CTRLBIT;
XRZj+muTZ break;
=fJDFg case VK_SHIFT:
Q5[x2 s_ d MaskBits&=~SHIFTBIT;
j_`
[Z break;
OT1 default: //judge the key and send message
"4Joou"U break;
#[|~m;K(w }
3Go/5X/ for(int index=0;index<MAX_KEY;index++){
{{hp;&x if(hCallWnd[index]==NULL)
}tq continue;
[i[*xf-B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,2t|(V*"& {
4LG[i}u.N SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?vmu,y bProcessed=TRUE;
CSKOtqKQ) }
W<f- }
icO$9c }
to2;. ~X else if((lParam&0xc000ffff)==1){ //有键按下
`ChS$p"A switch(wParam)
mS\gh)<h {
j6!C/UgQ case VK_MENU:
o#"U8N%r MaskBits|=ALTBIT;
i-.]onR break;
{6*$ yLWK case VK_CONTROL:
Ro}7ERA MaskBits|=CTRLBIT;
NCrNlHIF break;
:B^YK]. case VK_SHIFT:
=`MxgK + MaskBits|=SHIFTBIT;
gxKL
yZO! break;
tTjadnX default: //judge the key and send message
/9SEW!E break;
/M,C%.- }
B$ =oU for(int index=0;index<MAX_KEY;index++){
1K*`i( if(hCallWnd[index]==NULL)
v3p0 continue;
8v<802 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tPp9=e2[s {
l|kGp~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
N8[ &1 bProcessed=TRUE;
qjBF]3%t% }
RJ\'"XQ }
!_?K(X~/ }
7@W}>gnf if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
r,43 gg for(int index=0;index<MAX_KEY;index++){
D'8xP %P if(hCallWnd[index]==NULL)
BvnNAi continue;
N9dx^+\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
La2f]+sV SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;b`kN;s //lParam的意义可看MSDN中WM_KEYDOWN部分
;i'mma_! }
HZawB25{ }
^)nIf)9}7 }
Qi= pP/Y return CallNextHookEx( hHook, nCode, wParam, lParam );
kC_Kb&Q0 }
}R9>1u}6
zhC#< 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:
(v,g=BS, W"
i3:r BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
eqY8;/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
e"d-$$'e Fa0NHX2: 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:
I&J> cU|tG!Ij? LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
TpGnSD {
Z~3 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Q,LDn%+;B* {
W^,(we //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
D[
v2#2 SaveBmp();
;%Zu[G`C return FALSE;
f
q&(&(| }
01<Ti" …… //其它处理及默认处理
8x`EUJ }
rYCIU /tG[pg{[ 1>=]lMW 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。
~f6Q P,s>xM 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。
Rn $TYCO P_.zp5> 二、编程步骤
STL+tLJ Tg@:mw5 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
| /X+2K}3 ,Ma%"cWVC 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
tiPZ.a~k q\G7T{t$. 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;
{Rz(0oD\ LlcH#L$ 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;
pS~=T}o b?j\YX[e 5、 添加代码,编译运行程序。
W.(Q
u-AE( `hDH7u!U. 三、程序代码
l@ 5kw]6 ?/fC"MJq? ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Sg<
B+u\\ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
QT4&Ix,4T1 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
he|.Ow #if _MSC_VER > 1000
2f5YkmGc"; #pragma once
!8*7 {7 #endif // _MSC_VER > 1000
F):1@.S #ifndef __AFXWIN_H__
.|i/
a%J #error include 'stdafx.h' before including this file for PCH
(z:qj/| #endif
Zg3
/,:1 #include "resource.h" // main symbols
+yxL}=4s class CHookApp : public CWinApp
mq+x= {
@2~;)* public:
ap<r)<u CHookApp();
skF}_ // Overrides
bAEwjZ // ClassWizard generated virtual function overrides
zym6b@+jN //{{AFX_VIRTUAL(CHookApp)
9z+ZFIf7d public:
MxqIB(5k virtual BOOL InitInstance();
fLZ99?J virtual int ExitInstance();
0.&-1pw //}}AFX_VIRTUAL
1cS*T>` //{{AFX_MSG(CHookApp)
_2WW0 // NOTE - the ClassWizard will add and remove member functions here.
Ry40:;MYN // DO NOT EDIT what you see in these blocks of generated code !
9h"3u;/, //}}AFX_MSG
"}2I0tM DECLARE_MESSAGE_MAP()
8M,$|\U };
CQs,G8\/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
yeLd,M/I BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
mM'uRhO+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3F$N@K~s BOOL InitHotkey();
'u9y\vUy BOOL UnInit();
825 QS` #endif
GHQm$|3I C[CNJ66 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
d
wku6lCk #include "stdafx.h"
A]MX^eY #include "hook.h"
s8;*Wt #include <windowsx.h>
W^i[7 r #ifdef _DEBUG
/}k?Tg/ #define new DEBUG_NEW
CUx-k|\ #undef THIS_FILE
h#Z~x static char THIS_FILE[] = __FILE__;
4veXg/l #endif
t')%;N #define MAX_KEY 100
tlgg~MViS #define CTRLBIT 0x04
,L; y>::1 #define ALTBIT 0x02
_
Gkb[H&RZ #define SHIFTBIT 0x01
%<1_\N7 #pragma data_seg("shareddata")
4JL]?75 HHOOK hHook =NULL;
(8(P12l UINT nHookCount =0;
e\}'i- static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
%?J-0 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
/d>Jkv static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
(d['f]S+& static int KeyCount =0;
G@U}4'V9 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
'/3\bvZ #pragma data_seg()
w$aejz`[ HINSTANCE hins;
rnC<(f22 void VerifyWindow();
Wf=hFc1_@ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
mcWN. //{{AFX_MSG_MAP(CHookApp)
NW`Mc& // NOTE - the ClassWizard will add and remove mapping macros here.
/5~j"|
U' // DO NOT EDIT what you see in these blocks of generated code!
Y ^5RM //}}AFX_MSG_MAP
^2nH6,LPS END_MESSAGE_MAP()
pwl7aC+6d "5"{~3Gw^ CHookApp::CHookApp()
`82^!7 ! {
7b(r'b@N // TODO: add construction code here,
o[g]Va*8 // Place all significant initialization in InitInstance
8aVj@x$' }
WyUa3$[gO 9
xFX"_J CHookApp theApp;
nMOXy\&mI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?+L7Bd(EF% {
~I@ %ysR BOOL bProcessed=FALSE;
?Skv2!X| if(HC_ACTION==nCode)
>iI_bcqF {
X3l6b+p if((lParam&0xc0000000)==0xc0000000){// Key up
Y r8gKhv W switch(wParam)
cUwR6I9 {
W,.Exh case VK_MENU:
@4>?Y=# MaskBits&=~ALTBIT;
+u3vKzD break;
PUC:Pl77 case VK_CONTROL:
v>5TTL~? MaskBits&=~CTRLBIT;
`rpmh7*WV break;
rGzGbI= case VK_SHIFT:
US&:UzI. MaskBits&=~SHIFTBIT;
|al'_s}I break;
MX7$f (Hy default: //judge the key and send message
E :UJ"6 break;
uC?/p1 }
vH@b for(int index=0;index<MAX_KEY;index++){
XXb,*u 3 if(hCallWnd[index]==NULL)
SA~oGgk=P continue;
L7N>p4h]Xj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#^w8Y'{? {
;e Mb$px SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
-_f-j bProcessed=TRUE;
Z
)X( }
=64Ju Wvo }
,1i l& }
!~]'&9 else if((lParam&0xc000ffff)==1){ //Key down
YGZa##i switch(wParam)
#3YYE5cB {
8zpTCae^=7 case VK_MENU:
Z`ZML+;~6 MaskBits|=ALTBIT;
xS_tB)C break;
2l +t- case VK_CONTROL:
Su k;##I MaskBits|=CTRLBIT;
T>m|C}yy break;
vcSb:(' case VK_SHIFT:
<'O|7.
^^ MaskBits|=SHIFTBIT;
D/tFN+|P break;
d4LH`@SUZ- default: //judge the key and send message
Rc~63![O. break;
~\Udl }
|w.5*]?H for(int index=0;index<MAX_KEY;index++)
$3(E0\#O {
CMYkxU if(hCallWnd[index]==NULL)
jk5C2dy continue;
S,#UA%V" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
- S%8 {
UeaHH]U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%&iWc_" bProcessed=TRUE;
(?z"_\^n/ }
5I0j>{U& }
DC=XPn/V }
*YWk. if(!bProcessed){
<2fvEW/#v for(int index=0;index<MAX_KEY;index++){
SoB6F9 if(hCallWnd[index]==NULL)
Yu|L6#[E continue;
Xl/2-'4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S{JBV@@tC SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
fCi1JH; }
:JzJ(q/ }
\PK}4<x} }
n<MreKixE return CallNextHookEx( hHook, nCode, wParam, lParam );
qZX\riR }
g y1i% ./}W3 BOOL InitHotkey()
EV N:3 {
$e,'<Jl if(hHook!=NULL){
3NgyF[c nHookCount++;
!{ /AJb return TRUE;
$~:|Vj5iZ\ }
pv,I_" else
IHj9n>c)[ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
X=pPkgW if(hHook!=NULL)
W.
p'T}2 nHookCount++;
usI$ return (hHook!=NULL);
.0]Odf:@ }
TRQH{O\O BOOL UnInit()
#l_hiD`;r {
*x&y24 if(nHookCount>1){
?a` $Y>?h nHookCount--;
M}`G}* return TRUE;
4$8\IJ7G }
4AuJ1Z BOOL unhooked = UnhookWindowsHookEx(hHook);
3H@29TrJ+ if(unhooked==TRUE){
TS;?>J- nHookCount=0;
H?j!f$sw hHook=NULL;
XB\n4|4 }
X1Y+ao 1) return unhooked;
uzWz+atH }
d]QCk&XU o'p[G]NQ1o BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'A9U[| {
Bhw|!Y&% BOOL bAdded=FALSE;
f7j9'k for(int index=0;index<MAX_KEY;index++){
k^r-~q+NV# if(hCallWnd[index]==0){
g(F? qP_K hCallWnd[index]=hWnd;
pN7 v7rs HotKey[index]=cKey;
%Dm:|><V$b HotKeyMask[index]=cMask;
:*s+X$x,< bAdded=TRUE;
LkIbvJCV KeyCount++;
P};GcV- break;
VNWa3`w }
{-)*.l= }
wT-@v,$ return bAdded;
XpibI3:< }
dLy-J1h\ nV&v@g4Tt BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\P7y&`| {
!x1ivP BOOL bRemoved=FALSE;
9EKc{1
z for(int index=0;index<MAX_KEY;index++){
UqZ#mK i if(hCallWnd[index]==hWnd){
:_"%o= if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
K44j-Ypb hCallWnd[index]=NULL;
Ve^rzGU HotKey[index]=0;
My JG2C#R HotKeyMask[index]=0;
eFdN"8EW bRemoved=TRUE;
088"7 s KeyCount--;
D!CuE7} break;
[u}2xsSx }
4m3pF0k }
It3. }
61{IXx_ return bRemoved;
7__?1n~{ }
[*AWCV LX_{39?<{ void VerifyWindow()
E5F0C]hq {
;IX*4E'4s for(int i=0;i<MAX_KEY;i++){
'`fz|.|cbB if(hCallWnd
!=NULL){ k=):>}
if(!IsWindow(hCallWnd)){ J{bNx8.&
hCallWnd=NULL; auT'ATW7i
HotKey=0; 7JHS8C<]
HotKeyMask=0; |8YP8o
KeyCount--; Ar VNynQ
} a#G]5TZ
} 7f\@3r
} %1jApCJ
} aR~Od Ys
K:g:GEDgf
BOOL CHookApp::InitInstance() xRU ~hQ
{ DTR/.Nr'K
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]h6mJ{k
hins=AfxGetInstanceHandle(); I_h{n{,sr
InitHotkey(); Jf{
M[ z
return CWinApp::InitInstance(); 3JR1If
} wu2C!gyBo
78i"3Tm)w
int CHookApp::ExitInstance() ~8
w(M
{ &`J?`l X
VerifyWindow(); (&a<6k
UnInit(); U
DC>iHt
return CWinApp::ExitInstance(); $=-Q]ld&]
} r!7e:p JLO
t|Ipxk.)
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A->y#KQ
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^sjL@.'m$N
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Y[yw8a
#if _MSC_VER > 1000 a|v}L,
#pragma once FTg4i\Wp
#endif // _MSC_VER > 1000
j{;RuNt
GqrOj++>
class CCaptureDlg : public CDialog 23;e/Qr
{ WZ<kk T
// Construction X0.-q%5
public: Fc"&lk4e
BOOL bTray; Kx;DmwX-
BOOL bRegistered; X}5aE4K/
BOOL RegisterHotkey(); k<M~co;L
UCHAR cKey; C;jV{sb9c
UCHAR cMask; T"GuE[?a
void DeleteIcon(); 0kD8w j%
void AddIcon(); :~2An-V
UINT nCount; Sl{nS1q
void SaveBmp(); IHg)xZ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor '%m0@5|hCD
// Dialog Data Pj!{j)-tS
//{{AFX_DATA(CCaptureDlg) Uq,M\V\
enum { IDD = IDD_CAPTURE_DIALOG }; 28j=q-9Z
CComboBox m_Key; #NVqS5
BOOL m_bControl; ; YaR|)B
BOOL m_bAlt; ikGH:{
BOOL m_bShift; ~Lc>~!!t
CString m_Path; x,Cc$C~YP
CString m_Number; @x@w<e%
//}}AFX_DATA B=;pyhc
// ClassWizard generated virtual function overrides S%ri/}qI[{
//{{AFX_VIRTUAL(CCaptureDlg) Te8BFcJG
public: k"P2J}4eO
virtual BOOL PreTranslateMessage(MSG* pMsg); RTSR-<{z
protected: %;0w2W
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T$]2U>=<J
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2.2Z'$W
//}}AFX_VIRTUAL W7as=+;X
// Implementation JXlFo3<
protected: 1>*]jj}
HICON m_hIcon; K)qbd~<\
// Generated message map functions g)'tr
'
//{{AFX_MSG(CCaptureDlg) xQ7n$.?y@
virtual BOOL OnInitDialog(); \2<2&=h?
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 34C
^vBp
afx_msg void OnPaint(); F.=uJdl.!
afx_msg HCURSOR OnQueryDragIcon(); %6<Pt
virtual void OnCancel(); (nrrzOax
afx_msg void OnAbout(); s8|#sHT
afx_msg void OnBrowse(); 81_3{OrE<
afx_msg void OnChange(); bE>3D#V<
//}}AFX_MSG .;tO;j|6
DECLARE_MESSAGE_MAP() z1+rz%
}; U!a"r8u|8q
#endif i&,U);T
;_i0@@J
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file IQ{Xj3;?y
#include "stdafx.h" )
Q=G&
#include "Capture.h" ]@J}f}Mjo
#include "CaptureDlg.h" tL+8nTL
#include <windowsx.h> U>;itHW/
#pragma comment(lib,"hook.lib") _3p:q.
#ifdef _DEBUG -R'p^cMA
#define new DEBUG_NEW Re1@2a>
#undef THIS_FILE dr6 dK
static char THIS_FILE[] = __FILE__; [/uKo13
#endif l3MbCBX2
#define IDM_SHELL WM_USER+1 0D#!!r ;
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >q &ouVE
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [bPE?_a,
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !P Gow
class CAboutDlg : public CDialog E2*"~gL^,
{ ~vl: Tb
public: !v;r3*#Nky
CAboutDlg(); 4_.k Q"'DH
// Dialog Data /1li^</|p`
//{{AFX_DATA(CAboutDlg) Rg[e~##
enum { IDD = IDD_ABOUTBOX }; Br~%S?4"o
//}}AFX_DATA jZ
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// ClassWizard generated virtual function overrides iKabo,~
//{{AFX_VIRTUAL(CAboutDlg) u}%&LI`.
protected: <uTsXv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }BogE$tc
//}}AFX_VIRTUAL 8]?1gDS|9O
// Implementation ^LU[{HZV
protected: jATU b-
//{{AFX_MSG(CAboutDlg) J#x91Jh
//}}AFX_MSG VvF&E>fC
DECLARE_MESSAGE_MAP() #8z\i2I
}; fA,+qs
>A,WXzAK}S
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ewY[vbF
{ Ro1' L1:
//{{AFX_DATA_INIT(CAboutDlg) kxn;;
//}}AFX_DATA_INIT xY'g7<})$
} Ez$5wY^J
CXQ?P
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D1Sl+NOV
{ ;Z`)*TRp4
CDialog::DoDataExchange(pDX); 3QHZC0AY
//{{AFX_DATA_MAP(CAboutDlg) <C>i~<`d
//}}AFX_DATA_MAP $Tur"_`I;
} *tO<wp&
j>b OnCp~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V]O
:;(W_
//{{AFX_MSG_MAP(CAboutDlg) >Qx#2x+
// No message handlers LuqaGy}>-
//}}AFX_MSG_MAP " /'=gE
END_MESSAGE_MAP() Td F<
p_AV3
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) `/AzX *`
: CDialog(CCaptureDlg::IDD, pParent) Ax^'unfQ:
{ P8VU&b\
//{{AFX_DATA_INIT(CCaptureDlg) @iRVY|t/
m_bControl = FALSE; g7P1]CZ}
m_bAlt = FALSE; heKI<[8l
m_bShift = FALSE; fA8+SaXW%
m_Path = _T("c:\\"); jwq"B$ap
m_Number = _T("0 picture captured."); "P{&UwMmh
nCount=0; 4r. W:}4:
bRegistered=FALSE; XJzXxhk2
bTray=FALSE; $aA.d^
//}}AFX_DATA_INIT ?W
n(ciO
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @,MdvR+a
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ifs*-f
} i4I0oRp
`g1Oon_
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) mvgm o
{ 9^ r
CDialog::DoDataExchange(pDX); -"e}YN/
//{{AFX_DATA_MAP(CCaptureDlg) JLu0;XVK
DDX_Control(pDX, IDC_KEY, m_Key); {K9E% ,w
DDX_Check(pDX, IDC_CONTROL, m_bControl); %-l:_A
DDX_Check(pDX, IDC_ALT, m_bAlt); =b7&(x
DDX_Check(pDX, IDC_SHIFT, m_bShift); FZnHG;af
DDX_Text(pDX, IDC_PATH, m_Path); pD# "8h
DDX_Text(pDX, IDC_NUMBER, m_Number); ElXe=5L\#
//}}AFX_DATA_MAP uB1!*S1f
} }BJ1#<
AE&n^vdQW
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6Qb)Uq3}]
//{{AFX_MSG_MAP(CCaptureDlg) y^=oYL
ON_WM_SYSCOMMAND() &XRFX 5gP
ON_WM_PAINT() HzV+g/8>A
ON_WM_QUERYDRAGICON() XQOprIJ
U
ON_BN_CLICKED(ID_ABOUT, OnAbout) cf'}*$[S
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M:M>@|)
ON_BN_CLICKED(ID_CHANGE, OnChange) d5y2Y/QO
//}}AFX_MSG_MAP 6B/"M-YME
END_MESSAGE_MAP() {,FeNf46
:WIf$P?X
BOOL CCaptureDlg::OnInitDialog() g
u =fq\`
{ 2w|u)ow)
CDialog::OnInitDialog(); 0juIkN#
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |u ;BAb
ASSERT(IDM_ABOUTBOX < 0xF000); 3Z:!o$
CMenu* pSysMenu = GetSystemMenu(FALSE); &PuJV + y
if (pSysMenu != NULL) |/^aLj^u
{ .eNwC .8i
CString strAboutMenu; ff1B)e
strAboutMenu.LoadString(IDS_ABOUTBOX); )75yv<L2S,
if (!strAboutMenu.IsEmpty()) K}`p_)(
{ b*F~%K^i$
pSysMenu->AppendMenu(MF_SEPARATOR); @Q\$dneY
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
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} tc<M]4-
} yr9A0F0
SetIcon(m_hIcon, TRUE); // Set big icon sQAc"S
SetIcon(m_hIcon, FALSE); // Set small icon Zmbz-##HQ
m_Key.SetCurSel(0); q4GW=@eD
RegisterHotkey(); 3ZL7N$N}7
CMenu* pMenu=GetSystemMenu(FALSE); a/<pf\O
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z!C4>,
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8+|V!q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Gx_`|I{P
return TRUE; // return TRUE unless you set the focus to a control ENXW#{N.v
} \1`DaQp7
0/P-> n~
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @VC9gdO/
{ PtQ#
if ((nID & 0xFFF0) == IDM_ABOUTBOX) /N[o [q
{ O<Sc.@~
CAboutDlg dlgAbout; >)J47j7{c
dlgAbout.DoModal(); 2PP-0
E
} 7! b)'W?
else @z$pPo0fW
{ 76_8e{zbr
CDialog::OnSysCommand(nID, lParam); v(@+6#&
} JIbzh?$aD
} z@l!\m-
a EFe!_QY
void CCaptureDlg::OnPaint() v>y8s&/
{ a[P>SqT4`
if (IsIconic()) ^W[B[Y<k
{ Q0q)n=i}]
CPaintDC dc(this); // device context for painting "l[V%f E
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =Mu'+,dT
// Center icon in client rectangle W:{PBb"x8
int cxIcon = GetSystemMetrics(SM_CXICON); }Cmj (k`~
int cyIcon = GetSystemMetrics(SM_CYICON); uWR,6\_jY
CRect rect; $~G0#JL
GetClientRect(&rect); 0bPJEEd
int x = (rect.Width() - cxIcon + 1) / 2; 3<)@ll
int y = (rect.Height() - cyIcon + 1) / 2; \p3nd!OIG
// Draw the icon 'x45E.wYw
dc.DrawIcon(x, y, m_hIcon); =Qj+Ug'
} B=q)}aWc
else @q{:Oc^
{ -@ UN]K
CDialog::OnPaint(); ~E3SC@KL
} x<{;1F,k3
} liCCc;&B;
@ yg|OA}
HCURSOR CCaptureDlg::OnQueryDragIcon() e"o6C\c
{ XMeL^|D
return (HCURSOR) m_hIcon; _
r^90
} A4#3O5kij
J/]o WC`u
void CCaptureDlg::OnCancel() iJdrY6qd
{ j:v~MrQ7|
if(bTray) wcdW72
DeleteIcon(); $K6?(x_
CDialog::OnCancel(); ,Ou1!`6?t
} RFZU}.*K$
')P2O\YS
void CCaptureDlg::OnAbout() [U%ym{be^
{ xJ=ZQ)&]
CAboutDlg dlg; .y %pGi
dlg.DoModal(); {FV,j.D
} )tN?: l
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void CCaptureDlg::OnBrowse() ,u?wYW;
{ teq^xTUF[
CString str; koncWyW
BROWSEINFO bi; `x%U
char name[MAX_PATH]; {(m+M
ZeroMemory(&bi,sizeof(BROWSEINFO)); )){PBT}t]
bi.hwndOwner=GetSafeHwnd(); (aDb^(]>
bi.pszDisplayName=name; 9atjK4+o
bi.lpszTitle="Select folder"; [ 5CS}FB
bi.ulFlags=BIF_RETURNONLYFSDIRS; aW`:)y&f
LPITEMIDLIST idl=SHBrowseForFolder(&bi); q:`77
if(idl==NULL) R/ALR
return; ":UWowJO
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TRs[ ~K)n
str.ReleaseBuffer(); ?
-v
m_Path=str; N5q}::Odc
if(str.GetAt(str.GetLength()-1)!='\\') u#a%(
m_Path+="\\"; L?=#*4t
UpdateData(FALSE); bc3|;O
} 8N=%X-R%
Mv/IMO0rR
void CCaptureDlg::SaveBmp() T7>48eH
{ 2gQY8h8
CDC dc; J-t=1
dc.CreateDC("DISPLAY",NULL,NULL,NULL); _-4n~(
CBitmap bm; io1S9a(y
int Width=GetSystemMetrics(SM_CXSCREEN); |_l<JQvf`E
int Height=GetSystemMetrics(SM_CYSCREEN); ~pHJ0g:t
bm.CreateCompatibleBitmap(&dc,Width,Height); )LkM,T
CDC tdc; =8$|_
tdc.CreateCompatibleDC(&dc); Nj0-`j0E
CBitmap*pOld=tdc.SelectObject(&bm); #5'c\\?Q
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8q_1(& O
tdc.SelectObject(pOld); -rEeKt
BITMAP btm; X4d Xm>*?=
bm.GetBitmap(&btm); pY^pTWs(
DWORD size=btm.bmWidthBytes*btm.bmHeight; ((Vj]I%
;
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _oQtk^fp
BITMAPINFOHEADER bih; sx-EA&5-9k
bih.biBitCount=btm.bmBitsPixel; th5,HO~
bih.biClrImportant=0; [NQmL=l
bih.biClrUsed=0; BhqhyX\D&y
bih.biCompression=0; |?\gEY-Se
bih.biHeight=btm.bmHeight; "sFW~Y
bih.biPlanes=1; pG)9=X!9
bih.biSize=sizeof(BITMAPINFOHEADER); s9uL<$,'
bih.biSizeImage=size; wY' "ab
bih.biWidth=btm.bmWidth; 4st~3,lR$
bih.biXPelsPerMeter=0; 3CA|5A.Pa
bih.biYPelsPerMeter=0; %l Q[dXp
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I)[`ZVAXR
static int filecount=0; t[%x}0FP-F
CString name; aML#Z |n
name.Format("pict%04d.bmp",filecount++); l<u{6o
name=m_Path+name; &foD&
BITMAPFILEHEADER bfh; A ?#]s
bfh.bfReserved1=bfh.bfReserved2=0; (F/HU"C
bfh.bfType=((WORD)('M'<< 8)|'B'); gdOe)il\
bfh.bfSize=54+size; pI
&o?n
bfh.bfOffBits=54; %,33gZzf
CFile bf; !A~d[</]m
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ nHrP>zN
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 66/Z\H^d
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xcHen/4X
bf.WriteHuge(lpData,size); <#zwKTmK1
bf.Close(); 1Wv{xML"
nCount++; -UJ?L
} 5(423"(y
GlobalFreePtr(lpData); iOl%-Y
if(nCount==1) <'W=]IAV
m_Number.Format("%d picture captured.",nCount); |pBMrN+is
else p Z"o@';!
m_Number.Format("%d pictures captured.",nCount); <} &7 a s
UpdateData(FALSE); -<|Y 1PQ
} -<xyC8$^$
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) oE$hqd s
{ mU50pM~/i
if(pMsg -> message == WM_KEYDOWN) ;{Xy`{Cg!
{ jH(&oV
if(pMsg -> wParam == VK_ESCAPE) 4ffU;6~l'
return TRUE; ` ovgWv
if(pMsg -> wParam == VK_RETURN) 4b]_
#7Qm
return TRUE; 5!tb$p#z
} 6eM6[
return CDialog::PreTranslateMessage(pMsg); >jv\Qh
} F,Q?s9s
/oFc03d
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3&$Nd
{ i =-8@
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ NIaF 5z
SaveBmp(); =rEA:Q`~w
return FALSE; C w%BZ
} BMdSf(l
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Gbn4*<N
CMenu pop; @7fm1b
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Vg{Zv4+t
CMenu*pMenu=pop.GetSubMenu(0); Lbsr_*4t
pMenu->SetDefaultItem(ID_EXITICON); a&C.=
CPoint pt; zFywC-my@
GetCursorPos(&pt); |:N>8%@6c
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @ ICbKg:
if(id==ID_EXITICON) Z^*NnL.'
DeleteIcon(); c yP,[?N
else if(id==ID_EXIT) Ssf+b!e]
OnCancel(); ;T>+,
return FALSE; 0yz~W(tsm
} 'PpZ/ry$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FN!1|'VK
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ei|cD[
NY
AddIcon(); TY~Vi OC
return res; ]-:1se
} ]IS;\~
=*O=E@]
void CCaptureDlg::AddIcon() > ws!5q
{ =JW[pRI5a
NOTIFYICONDATA data; nv)))I\
data.cbSize=sizeof(NOTIFYICONDATA); 4jGLAor|
CString tip; &\^rQi/tf
tip.LoadString(IDS_ICONTIP); RLHYw@-j@
data.hIcon=GetIcon(0); y(}Eko4u5
data.hWnd=GetSafeHwnd(); B?3juyB`--
strcpy(data.szTip,tip); k;Hnu
data.uCallbackMessage=IDM_SHELL; W Y:s
gG
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _B[WY
data.uID=98; 1"YpO"Rh
Shell_NotifyIcon(NIM_ADD,&data); \I:.<2i
ShowWindow(SW_HIDE); 'M N1A;IJ
bTray=TRUE; h/K@IAd
} )xt4Wk/
5g>wV
void CCaptureDlg::DeleteIcon() 0hwj\{"
{ ?Ht=[ l=
NOTIFYICONDATA data; J633uH}}
data.cbSize=sizeof(NOTIFYICONDATA); ="'- &
data.hWnd=GetSafeHwnd(); k. GA8=]>
data.uID=98; iSiDSeW8
Shell_NotifyIcon(NIM_DELETE,&data); 0
iRR{a<
ShowWindow(SW_SHOW); "!KpXBc,>
SetForegroundWindow(); R ]P;sk5
ShowWindow(SW_SHOWNORMAL); ~O03Sit-
bTray=FALSE; sS9%3i/>
} +EkW>$
;:OsSq&
void CCaptureDlg::OnChange() OipqoI2
{ "U8S81'
RegisterHotkey(); K9|7dvzC:
} ;Z9IZ~
<
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BOOL CCaptureDlg::RegisterHotkey() CW`!}yu%
{ x8"#!Pw:`"
UpdateData(); *||d\peQ
UCHAR mask=0; c!wtf,F
UCHAR key=0; y LM"+.?pL
if(m_bControl) _Y!sVJ){,c
mask|=4; ]db@RbaH
if(m_bAlt) T)SbHp Y
mask|=2; 2"&)W dm
if(m_bShift) Phs-(3
mask|=1; |/T43ADW
key=Key_Table[m_Key.GetCurSel()]; "HlgRp]u
if(bRegistered){ 'jjb[{g^}}
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ][7p+IsB
bRegistered=FALSE; RiR:69xwR*
} 79BaDB`{a
cMask=mask; GwLFL.Ke
cKey=key; p]ivf
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^Z}Ob= .G
return bRegistered; RU&_j*U
} D7?C
!')y&7a~
四、小结 L
CSeOR
&.N$
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。