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:
aGE}
EK }
e(DuJ- 一、实现方法
@&Yl'&pn-R !>K=@9NC|. 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:
v6x jLP;O 33hP/p% #pragma data_seg("shareddata")
m#6p=E HHOOK hHook =NULL; //钩子句柄
qla=LS\-A+ UINT nHookCount =0; //挂接的程序数目
b1=! "Y@ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
E J6|y' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
!l.^]| static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Ln\Gv/) static int KeyCount =0;
i#4E*B_- static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Xo.3OER #pragma data_seg()
vZ=dlu_t C^U>{jf ! 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。
q="ymx~ += gU`<\ 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:
we*E}U4 z! k BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
7vGAuTfi/@ cKey,UCHAR cMask)
SEZ08:>x r {
irB}h!@ BOOL bAdded=FALSE;
.0X 5Vy for(int index=0;index<MAX_KEY;index++){
~1,$ if(hCallWnd[index]==0){
= P$7
" hCallWnd[index]=hWnd;
#xhl@=W; HotKey[index]=cKey;
;'<SsI HotKeyMask[index]=cMask;
t`V U< bAdded=TRUE;
#Wv8+&n KeyCount++;
uBM%E OE break;
[Mv'*.7 }
jzZEP4 }
HGj[\kU~ return bAdded;
?#ywUEY* i }
$V_w4!:Q //删除热键
"*d%el\63 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%]F{aR {
/KO2y0` BOOL bRemoved=FALSE;
b|@f!lA for(int index=0;index<MAX_KEY;index++){
6gq`V, if(hCallWnd[index]==hWnd){
nK]L0 *s if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
WO+>W+|N hCallWnd[index]=NULL;
pM!cF HotKey[index]=0;
<2I<Z'B,e HotKeyMask[index]=0;
+6<g N[ bRemoved=TRUE;
reoCyP\!! KeyCount--;
nC9xN break;
D r6u0rx8 }
lOIf4 }
Nb>C5TjR }
hN;$'%^ return bRemoved;
a)/ }T }
>-CNHb U
owbk: GM@0$ DLL中的钩子函数如下:
eI5W; Q4 )OQih+#?W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
oi^pU {
@CCDe`R* BOOL bProcessed=FALSE;
sbFA{l3 if(HC_ACTION==nCode)
Reg%ah|$/= {
%#lJn.o if((lParam&0xc0000000)==0xc0000000){// 有键松开
F
@Wb<+0 switch(wParam)
il:RE8 {
vH?3UW case VK_MENU:
CX>QP&Gj MaskBits&=~ALTBIT;
<gY.2#6C\% break;
?NUDHUn_ case VK_CONTROL:
Z&J.8A]L MaskBits&=~CTRLBIT;
8d>>r69$pa break;
x.U:v20` case VK_SHIFT:
E.Arq6 MaskBits&=~SHIFTBIT;
?)/&tk9.n break;
82=>I*0Q default: //judge the key and send message
mH4Jl1S& break;
59a7%w }
Jn1(- for(int index=0;index<MAX_KEY;index++){
vnv:YQV/ir if(hCallWnd[index]==NULL)
p=f8A71 continue;
_^] :tL6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&8Oy *' {
XZpF<7l SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
%4h$/~ bProcessed=TRUE;
Ky[-ZQQo=5 }
<cR]-Yr~ }
*W1:AGpz }
e5m-7{h@ else if((lParam&0xc000ffff)==1){ //有键按下
/A%31WE&1 switch(wParam)
DI:"+KMq{ {
roWg~U(S case VK_MENU:
o~p%ODH MaskBits|=ALTBIT;
Y:K1v:Knw break;
f}zv@6#& case VK_CONTROL:
,Je9]XT MaskBits|=CTRLBIT;
1n+JHXR\ break;
l Gy`{E| case VK_SHIFT:
7E)*]7B% MaskBits|=SHIFTBIT;
?C|b>wM/ break;
)Hlc\Mgy default: //judge the key and send message
gn4Sz") break;
N51RBA }
VaFv%%w for(int index=0;index<MAX_KEY;index++){
K<D=QweOon if(hCallWnd[index]==NULL)
Xx=c'j< continue;
:|E-Dx4F6H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
P}$DCD<$U {
ZklZU,\!|v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Qj/.x#T bProcessed=TRUE;
FTZaN1%` }
^CQVqa${] }
c *]6>50 }
B)(ZRH if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
m<e-XT for(int index=0;index<MAX_KEY;index++){
^-pHhh|g if(hCallWnd[index]==NULL)
"_36WX continue;
=jW=Z$3q if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Bis'59?U_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`]l*H3+hg //lParam的意义可看MSDN中WM_KEYDOWN部分
pe7R1{2Q_s }
DM)%=C6< }
RS1c+]rr }
s*.&DN return CallNextHookEx( hHook, nCode, wParam, lParam );
$tFmp) }
c/ABBvd| !$^LTBOH3 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:
m}>#s3KPA zD}2Zh] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
D= LLm$y
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
[(4s\c 58.b@@T 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
,aQ{ ~OQ/ |ws LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
>ay%
!X@3" {
K\vyfYi if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
p:8&&v~I {
sas:5iB5 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
x9B{|+tIoc SaveBmp();
h`%}5})= return FALSE;
h oL"K }
CYWL@<p, …… //其它处理及默认处理
O!#bM< * }
()I';o d%='W|i\p& Iw-3Z'hOX 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
%N
}0,a0 j6{9XIRo_ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
bB`p-1 MZInS:Vj 二、编程步骤
f)/5%W7n} Xeo2 < @[ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
'WLh
D< GH!Lu\y\ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
EvEI5/z E[N3`" 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Y$ To)qo XrD@q 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;
AUvUk<a 8@Kvh| 5、 添加代码,编译运行程序。
S;]][h= /kKF|Hg`c 三、程序代码
'qT[,iQ 9EqU
2~ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?$&iVN^UA #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
iO_6>&( #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
kX)Xo`^Ys #if _MSC_VER > 1000
|Q)c{9sD #pragma once
l;C00ZBOc #endif // _MSC_VER > 1000
Xitsbf=Gg #ifndef __AFXWIN_H__
M@b:~mI[sw #error include 'stdafx.h' before including this file for PCH
gnPu{-Ec* #endif
_9Zwg+oO[ #include "resource.h" // main symbols
+vh 4I class CHookApp : public CWinApp
:_y}8am;H~ {
bW9a_m yE public:
vw/L|b7G CHookApp();
>
R5<D'cEN // Overrides
:6r)HJ5sg // ClassWizard generated virtual function overrides
jRCG}' //{{AFX_VIRTUAL(CHookApp)
AvS<b3EoN public:
k&h3" virtual BOOL InitInstance();
Y={_o!9 virtual int ExitInstance();
=5jng. //}}AFX_VIRTUAL
lQSKY}h //{{AFX_MSG(CHookApp)
)LP=IT // NOTE - the ClassWizard will add and remove member functions here.
$ 3/G)/A // DO NOT EDIT what you see in these blocks of generated code !
Vo2{aK; //}}AFX_MSG
3RyB 0
n DECLARE_MESSAGE_MAP()
CtO `t5 };
U94Tp A6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
O!7v&$]1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
A=S_5y BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1D/9lR, BOOL InitHotkey();
Y"RjMyQh BOOL UnInit();
,XJ
Xw(LM #endif
*$eMM*4 sD[G?X //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Fuuy_+p@G #include "stdafx.h"
Ur/+nL{ #include "hook.h"
@{|vW #include <windowsx.h>
:QV-! #ifdef _DEBUG
=83FCq" #define new DEBUG_NEW
gISG<!+X^ #undef THIS_FILE
~T_4M static char THIS_FILE[] = __FILE__;
/d\#|[S #endif
)@O80uOFh #define MAX_KEY 100
\<bar ~ #define CTRLBIT 0x04
cn~M:LW23 #define ALTBIT 0x02
)_\ZUem #define SHIFTBIT 0x01
im6Rx=}E{ #pragma data_seg("shareddata")
@FBlF$vG HHOOK hHook =NULL;
cy6lsJ"? UINT nHookCount =0;
5A~lu4-q static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
HoIK^t~VT# static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
?7Y6: zo$^ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
YFF\m{# static int KeyCount =0;
{xzs{)9|Y4 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
- 9Ll'fbq #pragma data_seg()
#@#/M) HINSTANCE hins;
hZ ve8J void VerifyWindow();
dP0%<Q| BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
QX]~|?q //{{AFX_MSG_MAP(CHookApp)
PSM~10l, // NOTE - the ClassWizard will add and remove mapping macros here.
?=22@Q}g // DO NOT EDIT what you see in these blocks of generated code!
I}&`IUP //}}AFX_MSG_MAP
iIe\m V END_MESSAGE_MAP()
1+f>tv rk$$gXg9/ CHookApp::CHookApp()
z ]@ Q {
2th>+M~A // TODO: add construction code here,
M:4N'#` // Place all significant initialization in InitInstance
W.fsW<{4j }
1I{^]]qw =%O@%v CHookApp theApp;
hd@ >p. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^`96L {
8N8N)#A[ BOOL bProcessed=FALSE;
oY#62&wk4 if(HC_ACTION==nCode)
|N{?LKR
% {
d'4^c,d if((lParam&0xc0000000)==0xc0000000){// Key up
eiNF?](3O switch(wParam)
_wC4n }J {
:j}]nS case VK_MENU:
COF_a% MaskBits&=~ALTBIT;
/Lf+*u>" break;
l Wa4X#~. case VK_CONTROL:
'_nJ DM MaskBits&=~CTRLBIT;
^WZcM#~TL break;
|)7dh B case VK_SHIFT:
? ^EB"{ MaskBits&=~SHIFTBIT;
uEK9 break;
QL<uQ`>( default: //judge the key and send message
&g{b5x{iD break;
Q9UBxpDV: }
:2qUel\PEC for(int index=0;index<MAX_KEY;index++){
Zi0B$3iOb if(hCallWnd[index]==NULL)
Dd(# continue;
B_^ ~5_0: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%(c5T)B9 {
@bc=O1vX~; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
8b^v@|)N bProcessed=TRUE;
xS4B"/ }
A 11w{`EM }
&s +DK` }
!zd]6YL$ else if((lParam&0xc000ffff)==1){ //Key down
{iyO96YI[^ switch(wParam)
M=mzl750M {
&m>yY{be case VK_MENU:
Eagl7'x MaskBits|=ALTBIT;
>O{[w'sWa break;
7lo`)3mB case VK_CONTROL:
k3-'!dW< MaskBits|=CTRLBIT;
;oKN 8vI#7 break;
:f~[tox case VK_SHIFT:
IsaL+elq| MaskBits|=SHIFTBIT;
5eZ8$-&([ break;
DP(JsZ} default: //judge the key and send message
!L+4YA break;
Z/|oCwR }
AE_7sM for(int index=0;index<MAX_KEY;index++)
[r,ZM {
0={@GhjApL if(hCallWnd[index]==NULL)
RjII(4Et continue;
j2UiZLuV if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bVB_KE {
y5td o'Ex SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
sd@JQ%O bProcessed=TRUE;
^`W8>czi }
5$v,%~$Xds }
jLANv{" }
986y\9Zu if(!bProcessed){
"Y9PS_u(~ for(int index=0;index<MAX_KEY;index++){
3$.R=MQ7 if(hCallWnd[index]==NULL)
}mz6z<pJ_ continue;
our$Ka31 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~f.fg@v`+v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
B1EI'<S }
DrG9Kky{ }
Rmq8lU }
q`l&G% return CallNextHookEx( hHook, nCode, wParam, lParam );
$R\D[`y| }
ileqI/40f .,)C^hs@ BOOL InitHotkey()
Dlc=[kf9 {
z!z+E%H^ if(hHook!=NULL){
(&25 8i, nHookCount++;
{^r8uKo:~ return TRUE;
ewo1^> }
1;; is else
#~&SkIhBE hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
$.a4Og2 if(hHook!=NULL)
W[5a'}OV nHookCount++;
d"E@e21 return (hHook!=NULL);
6;LM1
_ }
l3d^V&Sk BOOL UnInit()
`}b#O}z)^ {
m&GxLT6 if(nHookCount>1){
(<= e? nHookCount--;
.RI{\ i` return TRUE;
>)/,5VSE }
/rKdxsI* BOOL unhooked = UnhookWindowsHookEx(hHook);
2wHvHH! if(unhooked==TRUE){
J>I.|@W4 nHookCount=0;
j}0W|* hHook=NULL;
SR,id B&i }
X*Ibk-PUM return unhooked;
Ig9gGI, }
SDdefB *rY@(| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~1x,m.f8 {
`/zx2Tkk BOOL bAdded=FALSE;
a(+.rf; for(int index=0;index<MAX_KEY;index++){
?2Q9z-$ if(hCallWnd[index]==0){
tBtG- X2 hCallWnd[index]=hWnd;
&f}a` /{@ HotKey[index]=cKey;
ZnX]Q+w HotKeyMask[index]=cMask;
*W'F6Hpu bAdded=TRUE;
a3&&7n KeyCount++;
mSn> break;
24ojjxz+ }
yfBVy8Sm }
%i7bkdcwk return bAdded;
5t`:=@u }
Pj4WWK X -&PiD BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*z2G(Uac {
bCM&Fe0GM BOOL bRemoved=FALSE;
8hx4s(1! for(int index=0;index<MAX_KEY;index++){
0!WF,)/T7i if(hCallWnd[index]==hWnd){
h$#QRH if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
K`=O!; hCallWnd[index]=NULL;
VDCG
5QP6( HotKey[index]=0;
'=|2, H] HotKeyMask[index]=0;
=B}a +0u! bRemoved=TRUE;
#WBlEVx;Z KeyCount--;
_JlbVe[< break;
taS2b#6\+ }
BPp`r_m8w} }
W/(D"[:l% }
3Un{Q~6h return bRemoved;
d$>TC(E=t }
YCJ6an ^DL}J>F9G void VerifyWindow()
^4Nk13 {
G_GPnKdd for(int i=0;i<MAX_KEY;i++){
7M#eR8*[se if(hCallWnd
!=NULL){ ?(9/V7HQ.5
if(!IsWindow(hCallWnd)){ t>D|1E"
hCallWnd=NULL; ]7qn&(]
HotKey=0; SZO$#
HotKeyMask=0; 8MHYk>O~{G
KeyCount--; H4s^&--
} =0te.io)3O
} K[tQ>C@s2
} W|IMnK-
} %LeQpbyOR
' `0kW_'
BOOL CHookApp::InitInstance() Vej [wY-c
{ / S32)=(
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'j^A87\M_
hins=AfxGetInstanceHandle(); bRSE"B
InitHotkey(); _ZM$&6EC
return CWinApp::InitInstance(); .Dn.|A
} pmm?Fq!s=
U} EaV<
int CHookApp::ExitInstance() ^Eu]i
{ 4uQ\JD(*Eu
VerifyWindow(); CqMm'6;$a}
UnInit(); ~r<@`[-L
return CWinApp::ExitInstance(); x-wIgo+
} pGQP9r%
MAhJ>qe8
p
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k[TVu5R
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ==zt)s.G(+
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g"k1O
#if _MSC_VER > 1000 tDWW
4H
#pragma once kq;1Ax0{
#endif // _MSC_VER > 1000 P}So>P~2
~r/"w'dB
class CCaptureDlg : public CDialog Y7WxV>E
{ b2}>{Li0
// Construction W62 $ HI
public: (IlHg^"
BOOL bTray; .YV{w L@cB
BOOL bRegistered; *&WkorByW
BOOL RegisterHotkey(); #BB,6E
UCHAR cKey; ^?pf.E!F`
UCHAR cMask; m:kXr^!D
void DeleteIcon(); YX A|1
void AddIcon(); []i/\0C^
UINT nCount; {FYWQ!L
void SaveBmp();
;E Z5/"T
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9YpgzCx
Z
// Dialog Data N$\'X<{
//{{AFX_DATA(CCaptureDlg) eWKFs)C]
enum { IDD = IDD_CAPTURE_DIALOG }; 2nNBX2o&_
CComboBox m_Key; 8*nv+
BOOL m_bControl; w_c)iJ
BOOL m_bAlt; y^PQgzm]
BOOL m_bShift; d:Y!!LV-@L
CString m_Path; r[doN{%
CString m_Number; 75@!j[QL<
//}}AFX_DATA cB$OkaG#
// ClassWizard generated virtual function overrides #'poDX?
//{{AFX_VIRTUAL(CCaptureDlg) z\S#P|;
public: #[ei/p
virtual BOOL PreTranslateMessage(MSG* pMsg); /_WAF90R?
protected: eUBf-xA
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %bu$t,
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C%2BDj
//}}AFX_VIRTUAL _?]0b7X
// Implementation %7w=; ]ym
protected: w=NM==cLj
HICON m_hIcon; " ^v/Y
// Generated message map functions noSkKqP
//{{AFX_MSG(CCaptureDlg) _&(\>{pm
virtual BOOL OnInitDialog(); l dd8'2
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -cgLEl1 J
afx_msg void OnPaint(); #7 )&`
afx_msg HCURSOR OnQueryDragIcon(); 6MCLm.L
virtual void OnCancel(); /{)}y
afx_msg void OnAbout(); C bWz;$r
afx_msg void OnBrowse(); cTC -cgp
afx_msg void OnChange(); +8<|P&fH
//}}AFX_MSG )b%t4~7
DECLARE_MESSAGE_MAP() Lud[.>i
}; KT5amct
#endif _xKIp>A
7+N0$0w%r
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lu_kir~
#include "stdafx.h" gxKL
yZO!
#include "Capture.h" ;mT|0&o>#
#include "CaptureDlg.h"
kM:Z(Z7$
#include <windowsx.h> Z\lJE>1
#pragma comment(lib,"hook.lib") ,6J{-Iu
#ifdef _DEBUG CP]nk0
#define new DEBUG_NEW 7 XNZEi9o
#undef THIS_FILE 7
KuUV!\h`
static char THIS_FILE[] = __FILE__; ~FP4JM,y6
#endif Kw%to9eh)
#define IDM_SHELL WM_USER+1 (:(Imk;9
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _i3?;Fds
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c-GS:'J{
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :P2{^0$
class CAboutDlg : public CDialog :VkuK@Th`
{ ;[qA?<GJ
public: 8+*
1s7{
CAboutDlg(); v}cTS@0
// Dialog Data _p^?_
//{{AFX_DATA(CAboutDlg) >(?}'pS8
enum { IDD = IDD_ABOUTBOX }; !W\za0p
//}}AFX_DATA V=i/cI\
// ClassWizard generated virtual function overrides D`Cy]j
//{{AFX_VIRTUAL(CAboutDlg) GhJ<L3
protected: Y>J$OA:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !:]/MpQ ?
//}}AFX_VIRTUAL {4F=].!
// Implementation QZh#&Qf;
protected: +g9CklJ
//{{AFX_MSG(CAboutDlg) Exb?eHO
//}}AFX_MSG q`Rc \aWB%
DECLARE_MESSAGE_MAP() .](~dVp%~
}; @u>:(9bp
V}Ok>6(~
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) U/#X,Bi~
{ wsKOafrV
//{{AFX_DATA_INIT(CAboutDlg) 7Dt*++:
//}}AFX_DATA_INIT ^)nIf)9}7
} *'-[J 2
5cF7w
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }R9>1u}6
{ g1H$wU3eu
CDialog::DoDataExchange(pDX); APJVD-
//{{AFX_DATA_MAP(CAboutDlg) !MyCxM6
//}}AFX_DATA_MAP iW?z2%#
} qg06*$%
ip+?k<]z
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Leu93f2
//{{AFX_MSG_MAP(CAboutDlg) &cpqn2Z
// No message handlers L^FQ|?*
//}}AFX_MSG_MAP z%q)}$O
END_MESSAGE_MAP() <#ng"1J
cU|tG!Ij?
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1CR)1H
: CDialog(CCaptureDlg::IDD, pParent) F"^/R
{ f-BPT2U+
//{{AFX_DATA_INIT(CCaptureDlg) T;M4NGmvd
m_bControl = FALSE; TFZxk
m_bAlt = FALSE; gWIb"l
m_bShift = FALSE; FyhLMW3
m_Path = _T("c:\\"); O<`N0
m_Number = _T("0 picture captured."); }~#Tsv
nCount=0; o)L)|
bRegistered=FALSE; uPVO!`N3
bTray=FALSE; 0{'m":D9
//}}AFX_DATA_INIT J$^"cCMr
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h( DmSW
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); N|2PW ~,
} &5y|Q?
rYCIU
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `'E(L&
{ fzJ^`
CDialog::DoDataExchange(pDX); 0: Nw8J
//{{AFX_DATA_MAP(CCaptureDlg) @@z5v bs'{
DDX_Control(pDX, IDC_KEY, m_Key); >c@jl
DDX_Check(pDX, IDC_CONTROL, m_bControl); Tr.u'b(
DDX_Check(pDX, IDC_ALT, m_bAlt); mhgvN-? "h
DDX_Check(pDX, IDC_SHIFT, m_bShift); M,vCAZ
DDX_Text(pDX, IDC_PATH, m_Path); ZK4d;oa",
DDX_Text(pDX, IDC_NUMBER, m_Number); 7PbwCRg
//}}AFX_DATA_MAP TtWWq5X|
} >sGiDK @
fyF8RTm{
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gl~9|$ivj>
//{{AFX_MSG_MAP(CCaptureDlg) r'<!wp@
ON_WM_SYSCOMMAND() ,UNnz&H+f
ON_WM_PAINT() !y&<IT(\4
ON_WM_QUERYDRAGICON() ++!'6!l
ON_BN_CLICKED(ID_ABOUT, OnAbout) q\G7T{t$.
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?&JKq^9\I
ON_BN_CLICKED(ID_CHANGE, OnChange) `sLD>@m
//}}AFX_MSG_MAP $}t;c62
END_MESSAGE_MAP() &9ERlZ(A
BC)1FxsGf
BOOL CCaptureDlg::OnInitDialog() bMB@${i}
{ ^@
Xzh:
CDialog::OnInitDialog(); ] 1s6=
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xd@ d$
ASSERT(IDM_ABOUTBOX < 0xF000); v[4-?7-
CMenu* pSysMenu = GetSystemMenu(FALSE); G.~Ffk
if (pSysMenu != NULL) ?/fC"MJq?
{ ,R}9n@JI^Y
CString strAboutMenu; ncpNesB
strAboutMenu.LoadString(IDS_ABOUTBOX); wz{&0-md*'
if (!strAboutMenu.IsEmpty()) S@@#L
{ UE-1p
pSysMenu->AppendMenu(MF_SEPARATOR); 2f5YkmGc";
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4vi[hiV
} C ~Doj
} ' 7H"ezt
SetIcon(m_hIcon, TRUE); // Set big icon /pWKV>tjj
SetIcon(m_hIcon, FALSE); // Set small icon h,ipQ>
m_Key.SetCurSel(0); &<EixDi4q
RegisterHotkey(); &&7&/
CMenu* pMenu=GetSystemMenu(FALSE); M%bD7naBq
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?h:xO\h8
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); mq+x=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {n{-5Y
return TRUE; // return TRUE unless you set the focus to a control S|O#KE
} -VvN1G6.x?
W.l#@p
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) g*;zVi
{ s]pNT1,
if ((nID & 0xFFF0) == IDM_ABOUTBOX) m#^;V
{ ^|(VI0KO
CAboutDlg dlgAbout; z:;yx
dlgAbout.DoModal(); MxqIB(5k
} #s{EIj~YR_
else
|`pDOd
{ H`4KhdqR
CDialog::OnSysCommand(nID, lParam); A"6&
} m$VCCDv
} A$n:
m U= 3w
void CCaptureDlg::OnPaint() 9h"3u;/,
{ \.]C`ocD
if (IsIconic()) HHL7z,%f
{ SNC)cq+{
CPaintDC dc(this); // device context for painting Jo\karpb
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |#sY(1
// Center icon in client rectangle yeLd,M/I
int cxIcon = GetSystemMetrics(SM_CXICON); S;tvt/\!Z
int cyIcon = GetSystemMetrics(SM_CYICON); T~
P<Gq},
CRect rect; k54b@U52 h
GetClientRect(&rect); pp+z5
int x = (rect.Width() - cxIcon + 1) / 2; }J6 y NoXu
int y = (rect.Height() - cyIcon + 1) / 2; $mxl&Qr>Q;
// Draw the icon ]]T,;|B
dc.DrawIcon(x, y, m_hIcon); _FCg5F2U
} ~En]sj
else MaZVGrcC
{ d
wku6lCk
CDialog::OnPaint(); Q!(qb
} Q"K`~QF"
} Fr#QM0--B
C3KAQU
HCURSOR CCaptureDlg::OnQueryDragIcon() n2Y a'YF
{ y>c Yw!
return (HCURSOR) m_hIcon; y
m?uj4I{
} drJUfsxV
/}k?Tg/
void CCaptureDlg::OnCancel() )BZ6QO`5n
{ w3M F62:
if(bTray) ~&D5RfK5f
DeleteIcon(); +&.39q!
CDialog::OnCancel(); 2LS91
} G[]h1f!
v)~!HCG
void CCaptureDlg::OnAbout() K@?K4o
{ {a,U{YJ\H
CAboutDlg dlg; zqLOwzMlLx
dlg.DoModal(); -HRa6
} VDlP,Mm*
@%8$k[
void CCaptureDlg::OnBrowse() $U'*}S
{ VuuF _y;
CString str; `We?j7O
BROWSEINFO bi; 6 )lWuY]e
char name[MAX_PATH]; 'OU`$K7n
ZeroMemory(&bi,sizeof(BROWSEINFO)); {d%hkbN+{
bi.hwndOwner=GetSafeHwnd(); f.:0T&%G
bi.pszDisplayName=name; G@U}4'V9
bi.lpszTitle="Select folder"; 91UC>]}H
bi.ulFlags=BIF_RETURNONLYFSDIRS; e"ClG/M_XS
LPITEMIDLIST idl=SHBrowseForFolder(&bi); j07b!j:"\}
if(idl==NULL) } a!HbH
return; cHJ4[x=
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); L$?YbQo7
str.ReleaseBuffer(); A~;+P
m_Path=str; 2>)::9e4
if(str.GetAt(str.GetLength()-1)!='\\') Zbf~E {
m_Path+="\\"; ,Y@4d79
UpdateData(FALSE); /5~j"|
U'
} OG^#e+
K<v:RbU|[1
void CCaptureDlg::SaveBmp() =cI> {
{ [x0*x~1B
CDC dc; ;".]W;I*O
dc.CreateDC("DISPLAY",NULL,NULL,NULL); WL;2&S/{@
CBitmap bm; x5k6"S"1,
int Width=GetSystemMetrics(SM_CXSCREEN); `82^!7 !
int Height=GetSystemMetrics(SM_CYSCREEN); GD4+f|1.*
bm.CreateCompatibleBitmap(&dc,Width,Height); LAuaowE\v
CDC tdc; >[<f\BN|
tdc.CreateCompatibleDC(&dc); o`nJJ:Cxq-
CBitmap*pOld=tdc.SelectObject(&bm); !!6g<S7)
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); H<
tdc.SelectObject(pOld); rEjEz+wu
BITMAP btm; <-HWs@8#
bm.GetBitmap(&btm); JTTI`b2l_
DWORD size=btm.bmWidthBytes*btm.bmHeight; ^39?@xc@
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G%T<wKD<
BITMAPINFOHEADER bih; Bpv"qU7
bih.biBitCount=btm.bmBitsPixel; gH0Rd
WX
bih.biClrImportant=0; _8wT4|z5
bih.biClrUsed=0; )H{OqZZYD
bih.biCompression=0; ,<;.'r
bih.biHeight=btm.bmHeight; /U="~{*-R
bih.biPlanes=1; T!|-dYYI
bih.biSize=sizeof(BITMAPINFOHEADER); P%ZU+ET
bih.biSizeImage=size; =_[Ich,}
bih.biWidth=btm.bmWidth; _3{8Zg
bih.biXPelsPerMeter=0; r|3<UR%
bih.biYPelsPerMeter=0; /KhY,G'Z
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x";4)u=
static int filecount=0; u+ 8wBb5!
CString name; 5yf`3vV|3@
name.Format("pict%04d.bmp",filecount++); Lt{&v^y
name=m_Path+name; uf`/-jY
BITMAPFILEHEADER bfh; @e+qe9A|
bfh.bfReserved1=bfh.bfReserved2=0; 8|Wl|@1(
bfh.bfType=((WORD)('M'<< 8)|'B'); nr%P11U\c
bfh.bfSize=54+size; c22L]Sxo
bfh.bfOffBits=54; FB
O_B
CFile bf; wdRk+
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pZ 7KWk4
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |^O3~!JP(>
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hn e}G._b
bf.WriteHuge(lpData,size); ~'LoIv20j)
bf.Close(); l>pnY%(A
nCount++; M aP -
} uy([>8uu
GlobalFreePtr(lpData); p%5(Qqmlk
if(nCount==1) .19_EQ>+
m_Number.Format("%d picture captured.",nCount); rrl{3
?
else D;Y2yc[v
m_Number.Format("%d pictures captured.",nCount); hmv*IF.
UpdateData(FALSE); g8]$BhRIfr
} BWzo|isv
L]=LY
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z
)X(
{ "SpsSQ
if(pMsg -> message == WM_KEYDOWN) 6}:(m#+
{ c/,B ?
if(pMsg -> wParam == VK_ESCAPE) u4Z
Accj
return TRUE; ]"i^VVw
if(pMsg -> wParam == VK_RETURN) #3YYE5cB
return TRUE; ]gVW&3ZW
} i7`/"5I
return CDialog::PreTranslateMessage(pMsg); 7qg. :h
} 6g"qwWZp
nDXy$f8
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tA-p!#V<k1
{ |q 0iX2W
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qO>A6
SaveBmp(); rM20Y(|
return FALSE; }5y]kn
} M"8?XD%
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ / 16 r_l
CMenu pop; 9iGp0_J
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )>!y7/3
CMenu*pMenu=pop.GetSubMenu(0); yXro6u?rC
pMenu->SetDefaultItem(ID_EXITICON); r?WOum
CPoint pt; UL3u2g;d
GetCursorPos(&pt); e_llW(*l8^
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xUIH,Fp-9
if(id==ID_EXITICON) $3(E0\#O
DeleteIcon(); KvlLcE~`o
else if(id==ID_EXIT) !8o;~PPVl
OnCancel(); V4|l7
return FALSE; IKnXtydeI}
} #|6M*;l N|
LRESULT res= CDialog::WindowProc(message, wParam, lParam); t8Giv89{
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {Yv5Z.L&(
AddIcon(); cN|
gaL
return res; =2d h}8Mz
} }1YQ?:@
a7e.Z9k!
void CCaptureDlg::AddIcon() nb(Od,L
{ 9<"l!noy
NOTIFYICONDATA data; ]Waa7)}DM
data.cbSize=sizeof(NOTIFYICONDATA); <#e!kWGR?
CString tip; U
zMIm
tip.LoadString(IDS_ICONTIP); *YWk.
data.hIcon=GetIcon(0); zmU>
data.hWnd=GetSafeHwnd(); vVH*\&H\T
strcpy(data.szTip,tip); 7@ mP;K0
data.uCallbackMessage=IDM_SHELL; rv%^2h<&
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; um$L;-2:
data.uID=98; K[9{]$(Z
Shell_NotifyIcon(NIM_ADD,&data); n)rSgzI
ShowWindow(SW_HIDE); G\
/L.T
bTray=TRUE; b+THn'2
} :JzJ(q/
@BqSu|'Du,
void CCaptureDlg::DeleteIcon() u=sZFr@m[
{ 6"La`}B(T8
NOTIFYICONDATA data; UvVq# <-
data.cbSize=sizeof(NOTIFYICONDATA); f/g-b]0
data.hWnd=GetSafeHwnd(); Cx
;n#dn*
data.uID=98; [K `d?&
Shell_NotifyIcon(NIM_DELETE,&data); LS4E.Xdn
ShowWindow(SW_SHOW); Med0O~T%
SetForegroundWindow(); ?yAjxoE~?
ShowWindow(SW_SHOWNORMAL); yo#fJ`
bTray=FALSE; {_X&{dZLX
} D<xDj#Z~1
G":u::hR
void CCaptureDlg::OnChange() d7v_>
{ \Gy+y`
RegisterHotkey(); vkW]?::Cfd
} VY "i>Ae
hi9@U]H#
BOOL CCaptureDlg::RegisterHotkey() i}Cy q
{ R TeG\U
UpdateData(); ]s~%1bd
UCHAR mask=0; 9C\@10 D
UCHAR key=0; Xldz&&@
if(m_bControl) TRQH{O\O
mask|=4; X8(WsN
if(m_bAlt) Y> PC>
mask|=2; IJofbuzw:
if(m_bShift) a9TKp$LP`
mask|=1; sQ%gf
key=Key_Table[m_Key.GetCurSel()]; BY??X=
if(bRegistered){ n;*W#c
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3+iQct[
bRegistered=FALSE; s
F3M= uz
} w-?Cg8bq<
cMask=mask; ^I6GH?19>e
cKey=key; aKC3vR0
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e"v oXe
return bRegistered; 6#1:2ZHKG
} bd3q207>
S&;D
四、小结 |%5nV=&\
*]* D^'
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。