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:
92
Pp.Rh
W11_MTIU 一、实现方法
2[M:WZ.1 &g)
` 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:
m(g$T O%c6 vp7 #pragma data_seg("shareddata")
~~5kAY- HHOOK hHook =NULL; //钩子句柄
8%`Sx[ UINT nHookCount =0; //挂接的程序数目
hH[JY(V static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
LDPo}ogs static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Nob(bD5SpE static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
w0*6GCP static int KeyCount =0;
|UR.7rOV static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
`GPK$ue
#pragma data_seg()
&]vd7Q.t u3k+Xg: 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。
XkdNWR0 T5-4Q 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:
G|^gaj '9 L9r 3jz BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
UdL`.D, cKey,UCHAR cMask)
2s6Vy {
1Tiq2+hmf BOOL bAdded=FALSE;
pd7FU~- for(int index=0;index<MAX_KEY;index++){
>Q5 SJZ/ if(hCallWnd[index]==0){
]E=JUYf0 hCallWnd[index]=hWnd;
oTx#e[8f{ HotKey[index]=cKey;
oY.JK HotKeyMask[index]=cMask;
N(1jm F bAdded=TRUE;
a-QHm;_S KeyCount++;
gXw\_ue< break;
}#E4t3 }
u5R^++ }
JHO9d:{- return bAdded;
2d3wQ)2 }
h{PLyWH //删除热键
ojIh;e BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4&|9304<H {
UNY>Q7 BOOL bRemoved=FALSE;
^?J:eB! for(int index=0;index<MAX_KEY;index++){
j 6v +S if(hCallWnd[index]==hWnd){
&F.lo9JJ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
4G`YZZQ hCallWnd[index]=NULL;
B:x4H}`vh HotKey[index]=0;
7Q[P HotKeyMask[index]=0;
WMUw5h bRemoved=TRUE;
]e"NJkcm KeyCount--;
E-"Jgq\aC break;
MESQAsx% }
C)ChF`Ru': }
w[|!$J? }
1m![;Pg3 return bRemoved;
'QW 0K]il }
}y[o[> 6Jj)[ R\5= ?_tOqh@in DLL中的钩子函数如下:
%pg*oX1VK6 )m)>k` 0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
E RMh% C {
;G\rhk BOOL bProcessed=FALSE;
\h0e09& I if(HC_ACTION==nCode)
,5L&$Q6 {
oFIs,[Go if((lParam&0xc0000000)==0xc0000000){// 有键松开
|x kixf4zz switch(wParam)
0cS.|\ZTA {
vMC;5r6*d case VK_MENU:
&=7ur MaskBits&=~ALTBIT;
K1+,y1c break;
m=}kGzIY4 case VK_CONTROL:
T%]:
tDa MaskBits&=~CTRLBIT;
RyM2CQg[ break;
igo7F@_, case VK_SHIFT:
wvh4AE5F|z MaskBits&=~SHIFTBIT;
&<> A break;
^~Ar default: //judge the key and send message
!*\^-uvaK break;
t(_XB|AKm }
a\MU5%}\ for(int index=0;index<MAX_KEY;index++){
8?)Da&+f if(hCallWnd[index]==NULL)
6 8_UQ. continue;
)0'O!O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<A6<q&g|E {
"3>#[o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
hB^"GYZ bProcessed=TRUE;
f'.yM* }
-pjL7/ gx }
tx.YW9xD }
.[_&>@bmrP else if((lParam&0xc000ffff)==1){ //有键按下
$YSOkyC? switch(wParam)
RE7[bM3a {
Ugs<WVp$ case VK_MENU:
,~kMkBkl~ MaskBits|=ALTBIT;
43VuH break;
+V7p?iEY case VK_CONTROL:
uC}YKT>V7 MaskBits|=CTRLBIT;
o1g[(zky break;
+_ G'FD case VK_SHIFT:
U
*I52$ MaskBits|=SHIFTBIT;
N4}h_mh^' break;
AzQ}}A;TSx default: //judge the key and send message
SBF3\ break;
J$P]>By5: }
-0Q!:5EC for(int index=0;index<MAX_KEY;index++){
$zbg if(hCallWnd[index]==NULL)
r8>
q*0~s continue;
LS_QoS if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^wHO!$ {
MR~BWH?@ 1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
q6D hypB bProcessed=TRUE;
onmO>q* }
Aqc( }
P&SR;{:y }
Uexb>| if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
Y/hay[6 for(int index=0;index<MAX_KEY;index++){
dGfWRqS] if(hCallWnd[index]==NULL)
u9&p/qMx2 continue;
i4-L!<bJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{:dE_tqo SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p75w^ //lParam的意义可看MSDN中WM_KEYDOWN部分
cK?t]%S }
Q{a!D0;4v }
3 (<!pA }
lWdE^- return CallNextHookEx( hHook, nCode, wParam, lParam );
tDwXb> }
c8Opc"UE {B}0LJIpL 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:
IaJ(T>"+ un/R7" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
~cez+VQe BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.Q#Eb %% Q2 edS| 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:
-yAIrvO1q W"0 # LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
OkQSqL {
*GDU=D} if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
V]8fn MH {
{P3,jY^ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
h '}5"m SaveBmp();
:G`_IB\ return FALSE;
rm
cy-}e }
0O:TKgb&C. …… //其它处理及默认处理
)I<.DN& }
Jw^+t)t V:+}]"yJ, xtnB:3 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。
'(Bs<)(H xM*v!J, 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。
HC0puLt_ k~gQn:.Cx 二、编程步骤
b6i0_fOO E=B9FIx~< 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";
COT;KC6
n *?8Q:@: 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
b
9?w
_ w9oiu$7), 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
qzLRA.#f^ X}Csl~W8in 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
(0][hdI~B oT_,k}L IX 5、 添加代码,编译运行程序。
OW.ckYt% l nZ=< T 三、程序代码
vKW%l ;L`'xFo>> ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
#8RQ7|7b| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
C +IXP #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
'D-imLV<< #if _MSC_VER > 1000
Nhf!;> #pragma once
UO&S6M]v7 #endif // _MSC_VER > 1000
;EJ6C#}
>7 #ifndef __AFXWIN_H__
7~65 @&P> #error include 'stdafx.h' before including this file for PCH
%_u3Np #endif
IFE C_F> #include "resource.h" // main symbols
x;SrJVDN class CHookApp : public CWinApp
4*54"[9Hr# {
B|%;(bM2C public:
qle\c[UM5 CHookApp();
dV5$L
e#y // Overrides
/yOd]N;$ // ClassWizard generated virtual function overrides
pUPb+:^R //{{AFX_VIRTUAL(CHookApp)
<ya3|ycnS public:
*7R3EUUk virtual BOOL InitInstance();
5p>a]gp virtual int ExitInstance();
z(]*'0)P //}}AFX_VIRTUAL
%1 v)rg
y //{{AFX_MSG(CHookApp)
N7E[wOP // NOTE - the ClassWizard will add and remove member functions here.
s4Wk2*7Mq // DO NOT EDIT what you see in these blocks of generated code !
0 #q_LB //}}AFX_MSG
h{! @^Q DECLARE_MESSAGE_MAP()
"&r1&StO };
o1Xk\R{ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
m$o|s1t BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
hsl8@=_ B BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Jd%#eD*k9 BOOL InitHotkey();
kgQEg)A]!x BOOL UnInit();
\<PW_'6 #endif
6^zv:C% LJiMtqg //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
)O}x&@Q #include "stdafx.h"
Gzs x0%`) #include "hook.h"
'`RCNk5l #include <windowsx.h>
e88JT_zrO #ifdef _DEBUG
/M#A[tZ3 #define new DEBUG_NEW
'*T7tl #undef THIS_FILE
z><JbSE? static char THIS_FILE[] = __FILE__;
E u@TCw8@ #endif
>GjaA1, #define MAX_KEY 100
FVSz[n #define CTRLBIT 0x04
_W!g'HP-D #define ALTBIT 0x02
qBpY3]/ #define SHIFTBIT 0x01
S<>e(x3g] #pragma data_seg("shareddata")
bH=5[ HHOOK hHook =NULL;
`$i`i 'S UINT nHookCount =0;
(YR] X_ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
o`#;[
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
%xg"e
O2x static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
sz)3
z static int KeyCount =0;
:l6sESr static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
YZoudX'" #pragma data_seg()
Q!"Li HINSTANCE hins;
nc3 1X void VerifyWindow();
:;JJvYIs BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
+28FB[W //{{AFX_MSG_MAP(CHookApp)
u54+oh|,M // NOTE - the ClassWizard will add and remove mapping macros here.
CSD8?k]2 // DO NOT EDIT what you see in these blocks of generated code!
R~tv?hP //}}AFX_MSG_MAP
UyJ5}fBJ END_MESSAGE_MAP()
jR48.W _2TIan} CHookApp::CHookApp()
eF2<L [9 {
P8TiB // TODO: add construction code here,
Qn<<&i~ // Place all significant initialization in InitInstance
0h; -Yg }
Ii"cDH9 rbJ-vEzo.# CHookApp theApp;
./6L&?*`~; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
aMHIOA%Kh {
=}V`O> BOOL bProcessed=FALSE;
OaZ~ if(HC_ACTION==nCode)
hsl Js^ {
bFTWuM if((lParam&0xc0000000)==0xc0000000){// Key up
N7jAPI@a\i switch(wParam)
<:ZN {
zcA"\ case VK_MENU:
B4{A(-Tc MaskBits&=~ALTBIT;
]=pEs6%O3 break;
^&,{ case VK_CONTROL:
XjX<?W MaskBits&=~CTRLBIT;
E`'+1 break;
ucMl>G'!gX case VK_SHIFT:
uxR_(~8 MaskBits&=~SHIFTBIT;
S>'wb{jj! break;
qV(Plt% default: //judge the key and send message
3rWqt break;
-m__I U }
}XAoMp for(int index=0;index<MAX_KEY;index++){
^ i\zMMR if(hCallWnd[index]==NULL)
sd=i!r)ya continue;
gz$=\=%>RL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
nGP>M#F {
XL"e<P;t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}we"IqLb bProcessed=TRUE;
!867DX3* }
@@I2bHyvb }
*M8 4Dry`y }
PCFm@S@Q else if((lParam&0xc000ffff)==1){ //Key down
#}A!Bk switch(wParam)
{~=[d`t {
FS20OD case VK_MENU:
=,(Ba' MaskBits|=ALTBIT;
3kJAaI8 break;
R!,RZ?|v case VK_CONTROL:
paF2{C)4 MaskBits|=CTRLBIT;
vF*H5\ m<a break;
^beW*O! case VK_SHIFT:
\(Hg_]>m MaskBits|=SHIFTBIT;
tBf u{oC break;
CqF<
BE default: //judge the key and send message
]{;K|rCR- break;
]r#tJT`M }
bb#w]!q for(int index=0;index<MAX_KEY;index++)
FS']3uJ/ {
,@2O_O`: if(hCallWnd[index]==NULL)
2
OGg`1XX continue;
'9b<r7\@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
3nG(z> {
b9:E0/6
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
tnTr&o# bProcessed=TRUE;
Pl 5+Oo }
gzuM>lf*{ }
[OMKk#vW }
cOS|B1xG if(!bProcessed){
yhTe*I=Gk for(int index=0;index<MAX_KEY;index++){
$YW z~^f if(hCallWnd[index]==NULL)
&18} u~M continue;
PAqziq. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
B]kz3FF SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
m(&ZNZK }
rb9x|| }
txliZ|.O }
TpnkJygIm return CallNextHookEx( hHook, nCode, wParam, lParam );
T$k) ^' }
Ib!`ChZ $<T)_g BOOL InitHotkey()
xo?f90+( {
fE M8/bhq if(hHook!=NULL){
fPspJug nHookCount++;
HeR-;L return TRUE;
6g<JPc }
<Q%o}m4Kt else
lM?P8#3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Vg2s~ce{ if(hHook!=NULL)
f)*}L? nHookCount++;
S"fnT*:.% return (hHook!=NULL);
gmrjCLj }
KUB"@wUr BOOL UnInit()
$H-s(3vq {
B_:K.]DK` if(nHookCount>1){
VCh%v -/ nHookCount--;
Amz7j8zJ return TRUE;
{U&Mo97rzX }
S6Kaw BOOL unhooked = UnhookWindowsHookEx(hHook);
N>@AsI if(unhooked==TRUE){
F-2HE><+ nHookCount=0;
Oa*/jZjr hHook=NULL;
KaO8rwzDN }
zQ7SiRt7* return unhooked;
_a c_8m }
Fnr*.k B<_T"n'#b BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4R^'+hy|? {
kigc+R BOOL bAdded=FALSE;
qk<tLvD_' for(int index=0;index<MAX_KEY;index++){
;g?5V if(hCallWnd[index]==0){
~Fisno hCallWnd[index]=hWnd;
Ei}B9 &O HotKey[index]=cKey;
jz/@Zg", HotKeyMask[index]=cMask;
O^
f[ugs bAdded=TRUE;
)M}bc1 _ KeyCount++;
`
R^[s56wp break;
3A'd7FJ0G }
EjvxfqPv }
^W'\8L return bAdded;
e}7qZ^ }
pcL02W|J Px)VDs=k BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vsLn@k3 {
/I: d<A BOOL bRemoved=FALSE;
~!Onz wmO for(int index=0;index<MAX_KEY;index++){
^${-^w@,%V if(hCallWnd[index]==hWnd){
011 _(v if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
O4(
Z%YBe hCallWnd[index]=NULL;
MYjDO>(_ HotKey[index]=0;
|L0 s HotKeyMask[index]=0;
$JcU0tPq0 bRemoved=TRUE;
y?Fh%%uNr KeyCount--;
Z\TH=UA break;
d4gl V`%. }
E]"ePdZZ/ }
G+}|gG8 }
XnV|{X%]U return bRemoved;
< R0c=BZ> }
pH)V:BmJ 8`'_ckIgr void VerifyWindow()
RYmk6w!w {
2Xgn[oI{ for(int i=0;i<MAX_KEY;i++){
5a-8/.}cP if(hCallWnd
!=NULL){ t3G%}d?
if(!IsWindow(hCallWnd)){ v@< "b U
hCallWnd=NULL; 0I079fqk<
HotKey=0; ~"{Kjr#R
HotKeyMask=0; e>"{nOY4
KeyCount--; d0IHl!X
} -s4qm)\
} zn@tLLX
} jG8ihi
} 5LXK#+Z
C{+~x@
BOOL CHookApp::InitInstance() Mx[tE?!2
{ 7?/ Fr(\
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (;cbgHo%}
hins=AfxGetInstanceHandle(); a\^DthZ!;|
InitHotkey(); !d%OoRSU'
return CWinApp::InitInstance(); ~M,nCG^4
} /.Gx
n0
_ ?=bW
int CHookApp::ExitInstance() q'{E $V)E
{ tUL(1:-C
VerifyWindow(); pSay^9ZI
UnInit(); ^yjc"r%B
return CWinApp::ExitInstance(); &!Y^DR/
} ld`oIEj!P_
c tTbvXP
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )|'? uN7
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CP/`ON
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JFl@{6c
#if _MSC_VER > 1000 W<k) '|
#pragma once kLADd"C
#endif // _MSC_VER > 1000 j{S\X'?
Vh4z+JOC
class CCaptureDlg : public CDialog ,8EeSnI
{ J'Gn M?M
// Construction 3| g'1X}
public: b8Y1 .y"#
BOOL bTray; D)f hk!<
BOOL bRegistered; (9@6M8A
BOOL RegisterHotkey(); 1% EIP-z
UCHAR cKey; vpTS>!i
UCHAR cMask; d;H1B/
void DeleteIcon(); HI)ks~E/
void AddIcon(); NCl$vc;,
UINT nCount; 19&!#z
void SaveBmp(); &2#<6=}
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kx$?IxZ
// Dialog Data (m~MyT#S
//{{AFX_DATA(CCaptureDlg) ub./U@1
enum { IDD = IDD_CAPTURE_DIALOG }; cM.q^{d`
CComboBox m_Key; vQYd!DSh
BOOL m_bControl; Xy=|qu
BOOL m_bAlt; rsy'ZVLUj
BOOL m_bShift; n"d~UV^Uw
CString m_Path; NTls64AS.
CString m_Number; ?cowey\m
.
//}}AFX_DATA Z'PL?;&+R
// ClassWizard generated virtual function overrides lg;`I tX]
//{{AFX_VIRTUAL(CCaptureDlg) (Q\QZu@
public: -9vAY+s.
virtual BOOL PreTranslateMessage(MSG* pMsg); +2MsyA?6_
protected: 9e1gjC\ c
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ] QtG gWtC
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); bG;vl;C
//}}AFX_VIRTUAL l*xA5ObV
// Implementation u*}6)=+:
protected: B5P++aQ
HICON m_hIcon; OJQ7nChMm
// Generated message map functions noGMfZ1
//{{AFX_MSG(CCaptureDlg) E^T/Qu
virtual BOOL OnInitDialog(); U/wY;7{)#
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5{[3I|m{
afx_msg void OnPaint(); .V
9E@_(
afx_msg HCURSOR OnQueryDragIcon(); Nr6YQH*[
virtual void OnCancel(); rOS fDv
afx_msg void OnAbout(); u;J9aKD
afx_msg void OnBrowse(); R~[
u|EC}
afx_msg void OnChange(); ,|?B5n&
//}}AFX_MSG ^L<1S/~)
DECLARE_MESSAGE_MAP() ?^5W.`Y2i
}; 9O~1o?ni
#endif D?8t'3no
5/>G)&
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %[&cy'
#include "stdafx.h" 2lE {
P
#include "Capture.h" ^~eT#Y8
#include "CaptureDlg.h" ;(TBg-LEK
#include <windowsx.h> 82efqzT
#pragma comment(lib,"hook.lib") W^P%k:anK
#ifdef _DEBUG .@ /5Ln
#define new DEBUG_NEW kSoAnJ|
#undef THIS_FILE
> ")%4@
static char THIS_FILE[] = __FILE__; C[_{ $j(J
#endif |#f
P8OK
#define IDM_SHELL WM_USER+1 Z:)\j.
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7Ja^d-F7
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DTAEfs!ZW
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; SDcD(G
class CAboutDlg : public CDialog #^%Rk'W
{ /,$6`V
public: ,K8PumM_
CAboutDlg(); Bn}@wO
// Dialog Data q yQPR
//{{AFX_DATA(CAboutDlg) s[8<@I*u
enum { IDD = IDD_ABOUTBOX }; /!d,f4n
//}}AFX_DATA <),FI <~
// ClassWizard generated virtual function overrides x{5I
//{{AFX_VIRTUAL(CAboutDlg) f+-w~cN
protected: YdhrFw0`~r
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /M\S^!g@
//}}AFX_VIRTUAL {(7C=)8):
// Implementation wa@X^]D8
protected: `61VP-r
//{{AFX_MSG(CAboutDlg) M@
! {m
//}}AFX_MSG (*^_wq-;
DECLARE_MESSAGE_MAP() / QSK$ZDC
}; 3[-L'!pOX3
?v8B;="#w
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) VL7zU->
{ }eULcgRG
//{{AFX_DATA_INIT(CAboutDlg) /XtxgO\T.
//}}AFX_DATA_INIT xAon:58m{
} \E]s]ft;+
+.b~2K1
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gj$gqO`B
{ PHT;%;m=
CDialog::DoDataExchange(pDX); !@p@u;djJ
//{{AFX_DATA_MAP(CAboutDlg) [ wr0TbtV
//}}AFX_DATA_MAP Xp4pN{h e
} rqT@i(i
#eR*|W7o
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xa5I{<<U
//{{AFX_MSG_MAP(CAboutDlg) D.)R8X
// No message handlers ,hYUxh45
//}}AFX_MSG_MAP D9 ,~Fc
END_MESSAGE_MAP() d=Q0/sI&
L`yS'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e9o(hL
: CDialog(CCaptureDlg::IDD, pParent) Cq}LKiu
{ "<txg%j\J
//{{AFX_DATA_INIT(CCaptureDlg) _ N.ZpKVu
m_bControl = FALSE; hXmW,+1
m_bAlt = FALSE; ){icI<
m_bShift = FALSE; i[T!{<
m_Path = _T("c:\\"); q71Tg
m_Number = _T("0 picture captured."); ;,'eO i
nCount=0; $l 0^2o=
bRegistered=FALSE; haqL
DVrf
bTray=FALSE; Mp7r`A,6
//}}AFX_DATA_INIT Y[
a$~n^:n
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Vdh5s 292h
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &NB[:S=
} Ag#p )
W5HC7o\4
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^W3xw[{
{ {UvZ
CDialog::DoDataExchange(pDX); !E4YUEY6
//{{AFX_DATA_MAP(CCaptureDlg) 7:9WiN5b
DDX_Control(pDX, IDC_KEY, m_Key); "qMd%RP
DDX_Check(pDX, IDC_CONTROL, m_bControl); Y GvtG U-
DDX_Check(pDX, IDC_ALT, m_bAlt); }+,1G!?z
DDX_Check(pDX, IDC_SHIFT, m_bShift); FgKDk!ci
DDX_Text(pDX, IDC_PATH, m_Path); p/4GOU5g
DDX_Text(pDX, IDC_NUMBER, m_Number); u2@:[:Ao
//}}AFX_DATA_MAP +p>tO\mo
} @0-<|,^]
J XbG|L
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ) zz"DH
//{{AFX_MSG_MAP(CCaptureDlg) Jd7+~isu~
ON_WM_SYSCOMMAND() sMs 0*B-[
ON_WM_PAINT() #92MI#|n9
ON_WM_QUERYDRAGICON() u4rG e!
ON_BN_CLICKED(ID_ABOUT, OnAbout) 'HH[[9Q
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) zxT&K|
ON_BN_CLICKED(ID_CHANGE, OnChange) u\Tq5PYXt
//}}AFX_MSG_MAP D)K/zh)
END_MESSAGE_MAP() '\[GquK;P
`G@]\)-!
BOOL CCaptureDlg::OnInitDialog() WVir[Kv%
{ o~*% g.
CDialog::OnInitDialog(); mj{TqF
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h/QZcA
ASSERT(IDM_ABOUTBOX < 0xF000); 65)/|j+
CMenu* pSysMenu = GetSystemMenu(FALSE); *)T},|Gc
if (pSysMenu != NULL) ys u"+J
{ l)4KX{Rz{A
CString strAboutMenu; "2o)1G
strAboutMenu.LoadString(IDS_ABOUTBOX); ")i4w{_y
if (!strAboutMenu.IsEmpty()) .?@$Rd2@W
{ j_j~BXhIS
pSysMenu->AppendMenu(MF_SEPARATOR); i%:oO
KI
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /MosE,7l
} wHEt;rc(
} ![0\m2~iv
SetIcon(m_hIcon, TRUE); // Set big icon OLXG0@
SetIcon(m_hIcon, FALSE); // Set small icon ,1a6u3f,
m_Key.SetCurSel(0); 18zv]v
%
RegisterHotkey(); 1I<fp $h
CMenu* pMenu=GetSystemMenu(FALSE); u?&P6|J&
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S)>L 0^M1
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;mjk`6p
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [K9l>O
return TRUE; // return TRUE unless you set the focus to a control p>Qzz`@e
} -V%"i,t
;vy" i
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f)Z$,&
{ 9h9 jS~h
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6`J*{%mP
{ -2{NI.-Xd
CAboutDlg dlgAbout; 9!NL<}]{
dlgAbout.DoModal(); J4;w9[a$
} SRRqIQz
else !NuiVC]
{ .-awl1 W
CDialog::OnSysCommand(nID, lParam); 9i;%(b{
} N>/!e787OU
} ;xS@-</:
P\pHos
void CCaptureDlg::OnPaint() ^mv F%"g
{ [U5[;BNRD
if (IsIconic()) wa\Yc,R
{ }~DlOvsq
CPaintDC dc(this); // device context for painting 8iGS=M
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^<}9#q/rt
// Center icon in client rectangle ;}@.E@s%'
int cxIcon = GetSystemMetrics(SM_CXICON);
{^a"T'+
int cyIcon = GetSystemMetrics(SM_CYICON); 'JU(2mF
CRect rect; nm`[\3R
GetClientRect(&rect); M ~zA
int x = (rect.Width() - cxIcon + 1) / 2; !ow:P8K?
int y = (rect.Height() - cyIcon + 1) / 2; :k*'MU}
// Draw the icon Ub2t7MU
dc.DrawIcon(x, y, m_hIcon); &)zNu
} 3CL/9C>
else .!e):&(8
{ 2!Yq9,`
CDialog::OnPaint(); a\pOgIp
} 'y[74?1
} ($pN OGH
MKf|(6;~
HCURSOR CCaptureDlg::OnQueryDragIcon() ?x1sm"]p'
{ _~/F-
return (HCURSOR) m_hIcon; SR!EQ<
} @a$_F3W
LmWZ43Z"@
void CCaptureDlg::OnCancel() Kkcb'aDR
{ BZ*',\o
if(bTray) 2FU+o\1%
DeleteIcon(); 1LYz
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CDialog::OnCancel(); t(AW2{%}
} 4'up bI
Oi%\'biM
void CCaptureDlg::OnAbout() e=Ko4Ao2y
{ U6cpj
CAboutDlg dlg; VwvL
dlg.DoModal(); N-Fs-uB
} h;cl+c|B
DB%}@IW"
void CCaptureDlg::OnBrowse() -@L7!,j
{ =z^2KH
CString str; m#1>y}
BROWSEINFO bi; !xk`oW
char name[MAX_PATH]; .8e]-^Z
ZeroMemory(&bi,sizeof(BROWSEINFO)); ])OrSsV}
bi.hwndOwner=GetSafeHwnd(); P1C{G'cR
bi.pszDisplayName=name; /S2lA>
bi.lpszTitle="Select folder"; KCP$i@Pjv
bi.ulFlags=BIF_RETURNONLYFSDIRS; XuS3#L/3p
LPITEMIDLIST idl=SHBrowseForFolder(&bi); M$_E:u&D
if(idl==NULL) 2 tD{c^
9<
return; jV{?.0/h|
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |?v(?
str.ReleaseBuffer(); !z?&
m_Path=str; Voy1
if(str.GetAt(str.GetLength()-1)!='\\') xB-\yWDZe
m_Path+="\\"; Q\Wh]=}
UpdateData(FALSE); mxD]`F
} QiH>!Ssw
K|L&mL&8
void CCaptureDlg::SaveBmp() vT@*o=I
{ ;>hRj!
CDC dc; corNw+|/w
dc.CreateDC("DISPLAY",NULL,NULL,NULL); c"KN;9c,
CBitmap bm; Db4(E*/pj!
int Width=GetSystemMetrics(SM_CXSCREEN); t2x2_;a
int Height=GetSystemMetrics(SM_CYSCREEN); Ey|{yUmU+
bm.CreateCompatibleBitmap(&dc,Width,Height); &3gC&b^i
CDC tdc; CWT#1L=
tdc.CreateCompatibleDC(&dc); ]2E#P.-!b
CBitmap*pOld=tdc.SelectObject(&bm); gy5 ^JL
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); GmhfBW?
tdc.SelectObject(pOld); P* X^)R
BITMAP btm; oZ,J{I!L
bm.GetBitmap(&btm); i4T=4q
DWORD size=btm.bmWidthBytes*btm.bmHeight; 3JYhF)G
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \k4tYL5
BITMAPINFOHEADER bih; @TJxU
bih.biBitCount=btm.bmBitsPixel; tTEw"DL_-
bih.biClrImportant=0; =csh=V@s
bih.biClrUsed=0; H4B|c42
bih.biCompression=0; *^y,Gg/
bih.biHeight=btm.bmHeight; =/5^/vwgY
bih.biPlanes=1; [~NJf3c"
bih.biSize=sizeof(BITMAPINFOHEADER); j(~e{HZ
bih.biSizeImage=size; 3d>8~ANi=%
bih.biWidth=btm.bmWidth; &u`EYxT
bih.biXPelsPerMeter=0; qu\cU(H|
bih.biYPelsPerMeter=0; ,V^2Oa
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1X5MknA
static int filecount=0; =kzuU1s
CString name; G&Fe2&5!w
name.Format("pict%04d.bmp",filecount++); rU4;yy*b
name=m_Path+name; -7Bg5{FA
BITMAPFILEHEADER bfh; &?[g8A
bfh.bfReserved1=bfh.bfReserved2=0; #| pn,/
bfh.bfType=((WORD)('M'<< 8)|'B'); !;3hN$5
bfh.bfSize=54+size; Y`N w E
bfh.bfOffBits=54; ?e{hidg
CFile bf; :6gRoMb]
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h+rW%`B
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C5Vlqc;
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
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bf.WriteHuge(lpData,size); V15/~
bf.Close(); ^(kmF UV,Z
nCount++; r01u3!
} Ec9%RAxl
GlobalFreePtr(lpData); 4A0v>G`E*#
if(nCount==1) >sjvE4s
m_Number.Format("%d picture captured.",nCount); j>8S,b=%
else n'To:
m_Number.Format("%d pictures captured.",nCount); a B$x(8pP@
UpdateData(FALSE); ]z O6ESH
} ;fW`#aE
BOflhoUX
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y(ceEV
{ bMq)[8,N
if(pMsg -> message == WM_KEYDOWN) E-jJ!>&K
{ jl>jy6T
if(pMsg -> wParam == VK_ESCAPE) 0fGt7 "Q
return TRUE; s%QCdU ]
if(pMsg -> wParam == VK_RETURN) tWyl&,3?1
return TRUE; E4$y|Ni"
} 2=
Y8$-
return CDialog::PreTranslateMessage(pMsg); w=_q<1a
} }y1r
yeW<
.[r1Qz7G
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1l5'N=hL
{ c(b2f-0!4
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l(Ya,/4
SaveBmp(); (:P#l&f
return FALSE; A("\m>g$b
} }<qZXb1
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ CwM1
_3cE
CMenu pop; e:l7 w3?O
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <a&w$Zc/
CMenu*pMenu=pop.GetSubMenu(0); C2CR#b=)i
pMenu->SetDefaultItem(ID_EXITICON); {[4.<|26
CPoint pt; Up1n0
GetCursorPos(&pt); llN/
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); cOf.z)kf6
if(id==ID_EXITICON) \kZ@2.pN
DeleteIcon(); $."DOZQ3U
else if(id==ID_EXIT) ekW#|
OnCancel(); XU<XK9EA
return FALSE; 2:RFPK
} H:nO\]
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ce3``W/H3
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]eUD3WUe>q
AddIcon(); 4T6: C?V
return res;
s)jNP\-
} `PZ\3SC'i
4/V;g%0uN;
void CCaptureDlg::AddIcon() TNDp{!<|L;
{ #kk5{*`
NOTIFYICONDATA data; ]u^ybW"
data.cbSize=sizeof(NOTIFYICONDATA); 7z_ZD0PxPc
CString tip; YSzC's[
tip.LoadString(IDS_ICONTIP); rB-R(2
CCN
data.hIcon=GetIcon(0); N1}r%!jk/
data.hWnd=GetSafeHwnd(); @QMU$]&i]
strcpy(data.szTip,tip); 8=@f lK
data.uCallbackMessage=IDM_SHELL; L&KL]n
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; P2&0bNY
data.uID=98; 4B9D
Shell_NotifyIcon(NIM_ADD,&data); O2":)zU.
ShowWindow(SW_HIDE); z6Fl$FFP
bTray=TRUE; ZA&bp{}D
} mBEMwJ}O`
]Exbuc
void CCaptureDlg::DeleteIcon() KjMwrMgC
{ n<P&|RTZ
NOTIFYICONDATA data; qm<-(Qc(W
data.cbSize=sizeof(NOTIFYICONDATA); R|k:8v{V=
data.hWnd=GetSafeHwnd(); P v=]7>e
data.uID=98; f9OY>|a9
Shell_NotifyIcon(NIM_DELETE,&data); *kTj,&x[
ShowWindow(SW_SHOW); ahdwoB
SetForegroundWindow(); 2%v6h
ShowWindow(SW_SHOWNORMAL); p' 6h9/
bTray=FALSE; O6vHo3k
} DJ0jtv6nQ-
)gz]F_
void CCaptureDlg::OnChange() _R^ZXtypd
{ aeVd.`lxM
RegisterHotkey(); '9'f\
} /oZvm
9@?|rje9
BOOL CCaptureDlg::RegisterHotkey() b'C#]DorE
{ H2xDC_Fs
UpdateData(); V*r/0|vd
UCHAR mask=0; E@%1HO_
UCHAR key=0; L{GlDoFk
if(m_bControl) Z<W f/
mask|=4; ;s #I b_
if(m_bAlt) i1X!G|Awfv
mask|=2; P'[ISGt
if(m_bShift) z}iz~WZ
mask|=1; <>( v~a]
key=Key_Table[m_Key.GetCurSel()]; M1]w0~G
if(bRegistered){ VeqB/QX
DeleteHotkey(GetSafeHwnd(),cKey,cMask); A8QUfg@uK~
bRegistered=FALSE; k.})3~F-
} nltOX@P-
cMask=mask; Rqbz3h~
cKey=key; [?=DPE%
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); XZQ-Ig18
return bRegistered; m^zD']
} &G[W$2`@
f'MRC
\
四、小结 qJJ
5o?'
A
k~|r#@
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。