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:
%04:z77
K :1g" 一、实现方法
oM6j>&$b ^cYStMjpy 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
h&)fu{ 3jvx2 #pragma data_seg("shareddata")
r5t;'eCea HHOOK hHook =NULL; //钩子句柄
7JbY}@ UINT nHookCount =0; //挂接的程序数目
B$cOssl static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
}x*7l`1 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
WMW1B}Z3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
J'oDOn.M static int KeyCount =0;
8';m)Jc static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
U(U@!G) #pragma data_seg()
&Fw[YGJayz `TUZZz 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。
'S =sj}X C">`' G2 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:
hHcJN P+[QI
U BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
T!MZ+Ph`F cKey,UCHAR cMask)
;avQ1T'{?g {
s(Z(e % BOOL bAdded=FALSE;
YTQ5sFuGM for(int index=0;index<MAX_KEY;index++){
a
"R7JjH if(hCallWnd[index]==0){
%1Yz'AiW[ hCallWnd[index]=hWnd;
oFWt(r HotKey[index]=cKey;
k/% #> HotKeyMask[index]=cMask;
59V#FWe- bAdded=TRUE;
OkLz^R?d KeyCount++;
Hal7
MP break;
}K2
/&kZ }
"[k1D_PZ }
b)N[[sOt return bAdded;
FC6x Fg^ }
x
Sv-;!y //删除热键
WrNLGkt BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
NwguP {
KacR?Al BOOL bRemoved=FALSE;
rVY?6OMkd for(int index=0;index<MAX_KEY;index++){
t{!/#eQC if(hCallWnd[index]==hWnd){
1j11|~ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
VM7 !0 hCallWnd[index]=NULL;
$H'8
#:[d_ HotKey[index]=0;
WP}ixcq# HotKeyMask[index]=0;
C@1CanL@3 bRemoved=TRUE;
Bp
:~bHf KeyCount--;
m#JI!_~! break;
g6WPPpqus }
X2qv^G, }
WE0}$P: }
t#Th9G]1 return bRemoved;
te i`/ }
Bz?l{4". c7\VTYT zxkM'8JC DLL中的钩子函数如下:
K}x_nW `ruNA>M LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
_3/ec]1 {
Jm4#V~w BOOL bProcessed=FALSE;
;J]25j]] if(HC_ACTION==nCode)
w!\3ICB {
^=^$tF if((lParam&0xc0000000)==0xc0000000){// 有键松开
_K'7(d0z switch(wParam)
N>0LQ
MI {
k'Gw!p} case VK_MENU:
%<ic%gt`# MaskBits&=~ALTBIT;
v9=}S\=Cd break;
L1sqU-gt case VK_CONTROL:
$/+so;KD MaskBits&=~CTRLBIT;
% #u.J
break;
l;OYUq~F case VK_SHIFT:
8'_ 0g[s MaskBits&=~SHIFTBIT;
/prYSRn8 break;
Z0$] tS default: //judge the key and send message
9t?L\ break;
Vo\H<_=G }
>)NQH9'1 for(int index=0;index<MAX_KEY;index++){
~O{W;Cyh if(hCallWnd[index]==NULL)
\6o\+OQk continue;
3+ =I;nj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
YGp)Oy}: {
/;Yy@oc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`N}d}O8
bProcessed=TRUE;
S/.^7R7{f }
\:Za[6 }
; DDe.f" }
|f\D>Y%) else if((lParam&0xc000ffff)==1){ //有键按下
eZH~je{1 switch(wParam)
x0A7O {
/_)l|<k+V case VK_MENU:
<*<U!J-i MaskBits|=ALTBIT;
z}+i=cAN break;
]!Oue_-; case VK_CONTROL:
Lu=O+{*8 MaskBits|=CTRLBIT;
GKZN}bOm\ break;
?iv=53<c# case VK_SHIFT:
:HRT 2I MaskBits|=SHIFTBIT;
L[y Pjw:0 break;
/aY pIMi9} default: //judge the key and send message
&J$##B break;
Qqc]aVRF }
O- #TZ for(int index=0;index<MAX_KEY;index++){
?,)"~c$hZ if(hCallWnd[index]==NULL)
XN#&NT{t} continue;
+BL{@,zr if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$ J1f.YE {
-:<lkq&/ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
[|RjHGf bProcessed=TRUE;
)K;]y-Us[ }
kccWoU, }
Y/fJQ6DY }
HbM0TXo if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
l+'F_a for(int index=0;index<MAX_KEY;index++){
xq[Yg15d% if(hCallWnd[index]==NULL)
fPqr6OYz continue;
wvN `R if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
<{Q'&T SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
|quij0_'e //lParam的意义可看MSDN中WM_KEYDOWN部分
F}Srn;V }
!l 6dg& }
N|K4{Frm }
uwmQ?LS]V return CallNextHookEx( hHook, nCode, wParam, lParam );
8Lz]Z
h=ZU }
B{MaMf) V5p0h~PK 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:
jVWK0Zba qf#)lyr<D6 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
poT&-Ic[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
tg\|? 2eb1lJdS 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:
3<:jx~y> eSfnB_@x2 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
?X9UTOx {
4w93}t.z if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Z[?mc|*x {
]Oeh=gq //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
h4)Bs\==mT SaveBmp();
[XR$F@o return FALSE;
xZ .!d.rn }
np9dM …… //其它处理及默认处理
MYdO jcN }
56}X/u h8{(KRa 6 B&0;4 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
=&nW~<- v @'6"7g 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
/=: j9FF C! 9} 二、编程步骤
=9wy/c$ r^fe4b 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";
%, P>%'0 KP]"P*?
? 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
0~Gle: "i^
GmVn 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;
ravyiOL aZS7sV28 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;
!&^gaUa{ /F)H\* 5、 添加代码,编译运行程序。
:-T*gqj| }G
VX>p 三、程序代码
JRaq!/[( V3Z]DA ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
g}LAks #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
0#_'o , #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
QzvHm1,@ #if _MSC_VER > 1000
oUZoj2G1 #pragma once
q5DEw&UZJ #endif // _MSC_VER > 1000
H`9Uf) #ifndef __AFXWIN_H__
7gF"=7{- #error include 'stdafx.h' before including this file for PCH
O+q/4 #endif
88s/Q0l #include "resource.h" // main symbols
6%G-Vs]*2 class CHookApp : public CWinApp
~`ny@WD9 {
> L2HET public:
_}xd}QW CHookApp();
I:cg}JZ>| // Overrides
i1lBto[ // ClassWizard generated virtual function overrides
L{-LX=G^ //{{AFX_VIRTUAL(CHookApp)
=c.5874A` public:
fWnD\mx?0 virtual BOOL InitInstance();
QS[L~97m2M virtual int ExitInstance();
$'rG-g!f\ //}}AFX_VIRTUAL
w"Y` ]2 //{{AFX_MSG(CHookApp)
4GdX/6C. // NOTE - the ClassWizard will add and remove member functions here.
58Xzup_" // DO NOT EDIT what you see in these blocks of generated code !
NoE*/!Sr //}}AFX_MSG
ia @'%8 DECLARE_MESSAGE_MAP()
(t+;O; };
\y`+B*\i LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
:Qt BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
n{*D_kM(H BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
!>,m&O-x BOOL InitHotkey();
"hxN !,DEZ BOOL UnInit();
HBS\<} #endif
FY{e2~gi CC=d I //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Mn1Pt|_@! #include "stdafx.h"
#G" xNl #include "hook.h"
O/s$SX%g #include <windowsx.h>
d\{>TdyF #ifdef _DEBUG
|1b_*G4| #define new DEBUG_NEW
yZr M.%V #undef THIS_FILE
>{gPN"S"a static char THIS_FILE[] = __FILE__;
S8[=S #endif
)L{ghy #define MAX_KEY 100
^DeERB #define CTRLBIT 0x04
R0ID2:i]F #define ALTBIT 0x02
eV:9y #define SHIFTBIT 0x01
C?v[Z]t #pragma data_seg("shareddata")
ZYU=\ HHOOK hHook =NULL;
zi R5:d3 UINT nHookCount =0;
#6Fez`A static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
'm1N/)F static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
,mhQ"\ +C static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
R'EUV0KX>Y static int KeyCount =0;
7w,FX.=;cv static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
VVH.2&`I #pragma data_seg()
Unj.f>U HINSTANCE hins;
voP7"Dl[ void VerifyWindow();
]^':Bmq BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
|F,R&<2 //{{AFX_MSG_MAP(CHookApp)
dI&!e#Y // NOTE - the ClassWizard will add and remove mapping macros here.
%~L>1ShtU // DO NOT EDIT what you see in these blocks of generated code!
$vC1 K5sLk //}}AFX_MSG_MAP
M FTkqbc END_MESSAGE_MAP()
J;_}lF9d@ 'o|30LzYgQ CHookApp::CHookApp()
k.("3R6v: {
SDu#Yt&mhh // TODO: add construction code here,
aRG2@5 // Place all significant initialization in InitInstance
L
pR''`2BT }
,@1p$n A+6 n# CHookApp theApp;
\drqG&wl LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qmO6,T-| {
@1*ohdHH BOOL bProcessed=FALSE;
Ox#\M0Wn$3 if(HC_ACTION==nCode)
3_~cMlr3T. {
t`*! w|}(1 if((lParam&0xc0000000)==0xc0000000){// Key up
~\{^%~[48 switch(wParam)
*Qugv^- {
~gB>) ] case VK_MENU:
5N%93{L MaskBits&=~ALTBIT;
?\C"YG69T break;
,'[<bP'%_ case VK_CONTROL:
B<j'm0a>B MaskBits&=~CTRLBIT;
>e\9Bf_ break;
pw7[y^[Qg case VK_SHIFT:
@u==x*{| MaskBits&=~SHIFTBIT;
-@T/b$]'n break;
zSo)k~&[3 default: //judge the key and send message
qM#R0ZUIe\ break;
kOIt(e }
_g1b{$ for(int index=0;index<MAX_KEY;index++){
r.4LU if(hCallWnd[index]==NULL)
K>*a*[t0Sy continue;
V&-~x^JK if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
J7r|atSk {
fS~;>n%R SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
oc8:r bProcessed=TRUE;
PaV-F_2 }
$<:E'^SAS }
=-_B:d; }
%f($*l. else if((lParam&0xc000ffff)==1){ //Key down
jqPkc28 switch(wParam)
V(Ub!n:j {
K|dso]b/ case VK_MENU:
.e_cgad : MaskBits|=ALTBIT;
^]{R.(#z break;
]\7]%( case VK_CONTROL:
z5)s/;Sc MaskBits|=CTRLBIT;
.'Y]R3\M+ break;
jDQZQ NS case VK_SHIFT:
^ f# FI& MaskBits|=SHIFTBIT;
-_`>j~ break;
,o)d3g-&g default: //judge the key and send message
Z!ha fhcX break;
um9_ru~ }
BJ% eZ. for(int index=0;index<MAX_KEY;index++)
eImn+_ N3 {
) $PDo
7# if(hCallWnd[index]==NULL)
FJ asS8 continue;
*Z|y'<s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ei2'[PK {
y~)1
1]'> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
aH^RoG} bProcessed=TRUE;
hWX% 66 }
,yd?gP-O }
E9~Ghx. }
lT(oL|{#P if(!bProcessed){
;3'.C~ for(int index=0;index<MAX_KEY;index++){
-wjN"g< if(hCallWnd[index]==NULL)
M)U{7c$c7 continue;
dPhQ :sd> if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
-|E!e.^7: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
OoWyPdC+P }
$sEy%- }
'Fmvu }
o<N nV return CallNextHookEx( hHook, nCode, wParam, lParam );
EVoEszR }
/iX+ R@ 0{=`on; BOOL InitHotkey()
)oyIe) {
*8LMn if(hHook!=NULL){
>Z1sb n nHookCount++;
xD6@Qk return TRUE;
b#X^=n2 }
>Q(3*d > else
3+XOZh8 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
)b:7-}d if(hHook!=NULL)
Zl*X?5u nHookCount++;
KQ~i<1&j return (hHook!=NULL);
rb|U;)C }
[i]Ub0Dh7 BOOL UnInit()
SLh(9%S; {
Dc_yM if(nHookCount>1){
@;'o2 nHookCount--;
C+TI]{t return TRUE;
P'`r }
)a-Du$kd BOOL unhooked = UnhookWindowsHookEx(hHook);
"sG=wjcw^ if(unhooked==TRUE){
ariLG [:X nHookCount=0;
nJo`B4'U hHook=NULL;
NUp<e%zB }
(;q;E\Ejq return unhooked;
zzyHoZJP }
rnF/H=I/ p>upA)W] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6Udov pl {
2o'Wy BOOL bAdded=FALSE;
oZAB _A)[- for(int index=0;index<MAX_KEY;index++){
<TP=oq?I/ if(hCallWnd[index]==0){
l6d$V9A hCallWnd[index]=hWnd;
wYmM"60 HotKey[index]=cKey;
/AW=5Ck- # HotKeyMask[index]=cMask;
l?Ya"C`FL bAdded=TRUE;
BW"5Aj KeyCount++;
8|" XSN break;
;A*`e$ }
:3I@(k\PY }
#Y4=J
6 return bAdded;
1~PV[2a }
:$n=$C-wp #E&80#Z5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{j7uv"|X7 {
^pYxKU_O BOOL bRemoved=FALSE;
4y+< dw for(int index=0;index<MAX_KEY;index++){
yrlf+tl if(hCallWnd[index]==hWnd){
Y 1t\iU if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Wr( y)D<y} hCallWnd[index]=NULL;
=17t-
[ HotKey[index]=0;
D}mjN=Y HotKeyMask[index]=0;
"OdXY"G bRemoved=TRUE;
WS`qVL]^& KeyCount--;
'L8'
'(eZ^ break;
R.yC(r }
i(NdGL#P }
fP.
6HF_p_ }
zR{W?_cV return bRemoved;
xLC3>>P }
jJ5W>Q1mK$ K|Di1)7=/ void VerifyWindow()
v+X)Qmzf~ {
6#HK'7ClL for(int i=0;i<MAX_KEY;i++){
m_)FC-/pSl if(hCallWnd
!=NULL){ aL&n[
if(!IsWindow(hCallWnd)){ o:_Xv.HRZo
hCallWnd=NULL; ^Gqt+K%
HotKey=0; N9v1[~ bv_
HotKeyMask=0; sL\L"rQN6
KeyCount--; lhBT@5Dm9
} pNKhc#-w
} kYjGj,m"
} |%'
nVxc4r
}
b4QI)z
y$_eCmq
BOOL CHookApp::InitInstance() egq67S
{ E/%9jDTQ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); HxIIO[h
hins=AfxGetInstanceHandle(); Y9&,t\ q
InitHotkey(); rl#p".4q
return CWinApp::InitInstance(); BBtzs^C|
} 3G(miP6
]{ntt}3G,
int CHookApp::ExitInstance() 50o~ P!Lz|
{ <psZQdH
VerifyWindow(); .n~M(59
UnInit(); Np"exFqN k
return CWinApp::ExitInstance(); j'HZ\_
} Bq$rf < W
t({W
[JL
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D?NbW @]
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #6CC3TJ'k
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [D<1CF
#if _MSC_VER > 1000 C,NJb+J
#pragma once /JWGifH
#endif // _MSC_VER > 1000 ybY]e; v*O
ZOZ+ Y\uU
class CCaptureDlg : public CDialog eep1I
:N
{ T-U}QM_e
// Construction 'LO^<
public: :gep:4&u
BOOL bTray; 2fWTY0
BOOL bRegistered; -(~!Jo_*'
BOOL RegisterHotkey(); "-vW,7y
UCHAR cKey; f PM8f
UCHAR cMask; *U
P@9D
void DeleteIcon(); -i%e!DgH
void AddIcon(); _N{RVeO
UINT nCount; @n{JM7ctJ
void SaveBmp(); [E/\#4b
CCaptureDlg(CWnd* pParent = NULL); // standard constructor V;,{}
// Dialog Data [<
&oF
//{{AFX_DATA(CCaptureDlg) a
0GpfW$t
enum { IDD = IDD_CAPTURE_DIALOG }; AMyIAZnYq)
CComboBox m_Key; B>0].CK`
BOOL m_bControl; gk0( ANx
BOOL m_bAlt; fmb} 2h
BOOL m_bShift; "HDcmIXg&
CString m_Path; mqSQL}vR
CString m_Number; ^h"`}[+
//}}AFX_DATA ?'KL11@R
// ClassWizard generated virtual function overrides @NNq z
//{{AFX_VIRTUAL(CCaptureDlg) SV~cJ]F
public: #0y)U;dA+w
virtual BOOL PreTranslateMessage(MSG* pMsg); \cUC9/
b
protected: VB,?Mo}R
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4}eepJOn
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qa0 yg8,<
//}}AFX_VIRTUAL $>u*}X9
// Implementation {z")7g ]l
protected: {l/-LZ.
HICON m_hIcon; 2kIa*#VOJ
// Generated message map functions 7Z-O_h3;)@
//{{AFX_MSG(CCaptureDlg) Vv.|br`;}
virtual BOOL OnInitDialog(); R'!
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); /XzH?n/{R
afx_msg void OnPaint(); ,Q
HU_jt
afx_msg HCURSOR OnQueryDragIcon(); IHcD*zQ
virtual void OnCancel(); 9mmCp&~Z
afx_msg void OnAbout(); ucG@?@JENm
afx_msg void OnBrowse(); 6 1F(<!
afx_msg void OnChange(); 93`
AWg/T
//}}AFX_MSG 3v5%y'
DECLARE_MESSAGE_MAP() X;"Sx#U
}; \ywXi~+kUv
#endif iC98_o_9
f;x kT
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file y&?6FY
#include "stdafx.h" C'o64+W^
#include "Capture.h" !3 f?:M
#include "CaptureDlg.h" =[@zF9
#include <windowsx.h> oaoU _V
#pragma comment(lib,"hook.lib") ?6fnpGX@a
#ifdef _DEBUG @AIaC-,~]
#define new DEBUG_NEW S&b*rA02zp
#undef THIS_FILE 4:dH]
static char THIS_FILE[] = __FILE__; q&W[j5E
#endif #py[
#define IDM_SHELL WM_USER+1 XbD4:i%
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^`)) C;
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PGLplXb#[S
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; uFPF!Ern
class CAboutDlg : public CDialog =p=rg$?
{ ~==>pj
public: .7.b:Dn0
CAboutDlg(); |!"`MIw,
// Dialog Data 06N}k<10O
//{{AFX_DATA(CAboutDlg) !,Va(E|=
enum { IDD = IDD_ABOUTBOX }; :qIXY/
//}}AFX_DATA RkBb$q9F]
// ClassWizard generated virtual function overrides V9dF1Hj
//{{AFX_VIRTUAL(CAboutDlg) R)RG[F#
protected: }5}.lJ:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =W BTm
//}}AFX_VIRTUAL 6u7?dG'4
// Implementation zY('t!u8
protected:
WqXbI4;pJ
//{{AFX_MSG(CAboutDlg) H=Y{rq @
//}}AFX_MSG :=\Hoz
DECLARE_MESSAGE_MAP() E~gyy]8&
}; f,:9N 5Z
VI'hb'2
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &'}/f5s|
{ >V*mr{/1
//{{AFX_DATA_INIT(CAboutDlg) l33Pm/V2?
//}}AFX_DATA_INIT O^^C;U@U<1
} hnc@
-2 A(5B9Fq
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _;UE9S%
{ \3S8 62B7
CDialog::DoDataExchange(pDX); !`M|C?b
//{{AFX_DATA_MAP(CAboutDlg) ` M3w]qJ<}
//}}AFX_DATA_MAP zN:K%AiGxe
} f^"N!f a
aW`Lec{.
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) c;n *AK
//{{AFX_MSG_MAP(CAboutDlg) '-"/ =j&d[
// No message handlers j"'(sW-
//}}AFX_MSG_MAP m|:_]/*qE
END_MESSAGE_MAP() T2!6(,
s9
/x[jQM\
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7|[mz> "d
: CDialog(CCaptureDlg::IDD, pParent) vDxe/x%
{ B9H@e#[
//{{AFX_DATA_INIT(CCaptureDlg) 8'4S8DM
m_bControl = FALSE; "t_-f7fS7
m_bAlt = FALSE; R]btAu;Z
m_bShift = FALSE; a8 mVFm
m_Path = _T("c:\\"); ?`#/ 8PN
m_Number = _T("0 picture captured."); ,}))u0q+:
nCount=0; yRfSJbzaf\
bRegistered=FALSE; KjE+QUa
bTray=FALSE; Y~(Md@!0S
//}}AFX_DATA_INIT <c,u3cp
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0Pe>Es|^A#
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); W>p-u6u%E|
} /O^RF }
7El[ >
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) AbYqf%~7`l
{ .On|uC)!
CDialog::DoDataExchange(pDX); 5_z33,q2
//{{AFX_DATA_MAP(CCaptureDlg)
OPx`u
DDX_Control(pDX, IDC_KEY, m_Key); ykX/9y+-s
DDX_Check(pDX, IDC_CONTROL, m_bControl); naw0$kXTA
DDX_Check(pDX, IDC_ALT, m_bAlt); fI~Xmw+}}
DDX_Check(pDX, IDC_SHIFT, m_bShift); Ts ^"xlK
DDX_Text(pDX, IDC_PATH, m_Path); qh2ON>e;
DDX_Text(pDX, IDC_NUMBER, m_Number); \u>"s
//}}AFX_DATA_MAP :E@3Vl#U
} cvfr)K[0
%ve:hym*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :9_L6
//{{AFX_MSG_MAP(CCaptureDlg) |Clut~G
ON_WM_SYSCOMMAND() f'aVV!
ON_WM_PAINT() HsHB!mQV
ON_WM_QUERYDRAGICON() j.L-{6_s>~
ON_BN_CLICKED(ID_ABOUT, OnAbout) Ffv`kn@
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) PUBWZ^63
ON_BN_CLICKED(ID_CHANGE, OnChange) -!N&OZ+R
//}}AFX_MSG_MAP 0Emr<n
END_MESSAGE_MAP() q"<ac qK
NX/;+{
BOOL CCaptureDlg::OnInitDialog() Z<SLc,]^
{ JA'h4AXk
CDialog::OnInitDialog(); $d)ca9
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); l: <?{)N`
ASSERT(IDM_ABOUTBOX < 0xF000); [-;_ZFS{
CMenu* pSysMenu = GetSystemMenu(FALSE); JNa"8
if (pSysMenu != NULL) 72Iy^Y[MX
{ "Za>ZRR
CString strAboutMenu; k=B]&F
strAboutMenu.LoadString(IDS_ABOUTBOX); (jFGa2{
if (!strAboutMenu.IsEmpty()) YH%'t=
<m
{ D[mSmpjE6&
pSysMenu->AppendMenu(MF_SEPARATOR); oNU0 qZ5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tdSfi<y5I
} Ar:*oiU
} !2'jrJGc
SetIcon(m_hIcon, TRUE); // Set big icon -sjd&)~S[
SetIcon(m_hIcon, FALSE); // Set small icon pm\x~3jHs
m_Key.SetCurSel(0); \CXQo4P
RegisterHotkey(); :I:!BXQT$
CMenu* pMenu=GetSystemMenu(FALSE); 4x;/HEb7?
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); HaYE9/xS
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 2#<xAR
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %d>=+Ds[
return TRUE; // return TRUE unless you set the focus to a control k-HCeZ
} :)_~w4&
l*kPOyB
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) LX@/RAd vz
{ '`XX
"_k3
if ((nID & 0xFFF0) == IDM_ABOUTBOX) PG_0\'X)/w
{ 9v}G{mQ#
CAboutDlg dlgAbout; u\LFlX0sO
dlgAbout.DoModal(); q|v(Edt|_[
} ]"1`+q6i
else I-WhH>9
{ &znQ;NH#
CDialog::OnSysCommand(nID, lParam); KA){''>8
} & M~`:R
} LF~*^n>
yfx7{naKC`
void CCaptureDlg::OnPaint() e|p$d:#!
{ USVqB\#
if (IsIconic()) KTn}w:+B\
{ 8ZKo_I\
CPaintDC dc(this); // device context for painting h|h>u
^@
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3v
mjCm
// Center icon in client rectangle )Jk0v_ X
int cxIcon = GetSystemMetrics(SM_CXICON); mXUGe:e8
int cyIcon = GetSystemMetrics(SM_CYICON); q@@T]V6
CRect rect; &/uu)v
GetClientRect(&rect); &%s8L\?
int x = (rect.Width() - cxIcon + 1) / 2; '{J&M|<A
int y = (rect.Height() - cyIcon + 1) / 2; <YOLx R
// Draw the icon AjT%]9
V?
dc.DrawIcon(x, y, m_hIcon); Gu'rUo3Do
} Pj4/xX
else *+\SyO
{ SnFk>`
CDialog::OnPaint(); Yb/i{@AJ
} g"?Y+j
} 59%tXiO
wmTq` XH)
HCURSOR CCaptureDlg::OnQueryDragIcon()
l"!Ko G7
{ p8\zG|b5
return (HCURSOR) m_hIcon; j~+>o[c
} g-e#!(
A%^w^f
void CCaptureDlg::OnCancel() >j'ZPwj^
{ w7FW^6Zl
if(bTray) ;Wl+zw
DeleteIcon(); *_KFW@bC:
CDialog::OnCancel(); ,Vh{gm1
} ^ mS
o1?<
@EDs~ lPv
void CCaptureDlg::OnAbout() Nof3F/2 N&
{ 7\9>a
CAboutDlg dlg; {qmdm`V[
dlg.DoModal(); wAz&"rS
} ^.hoLwp.
kf;/c}}
void CCaptureDlg::OnBrowse() s7l;\XBy
{ a9T@$:
CString str; Ma\Gb+>
BROWSEINFO bi; e+j)~RBnu3
char name[MAX_PATH]; \N4
y<
ZeroMemory(&bi,sizeof(BROWSEINFO)); gF0q@M y~
bi.hwndOwner=GetSafeHwnd(); }>'PT-
bi.pszDisplayName=name; K"0PTWt
bi.lpszTitle="Select folder"; ph_4q@
bi.ulFlags=BIF_RETURNONLYFSDIRS; [ e8x&{L-_
LPITEMIDLIST idl=SHBrowseForFolder(&bi); |<Gl91
if(idl==NULL) ]ZoD'-,
return; `d[1`P1i[
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zt<WXw(
str.ReleaseBuffer(); Y=
]dvc
m_Path=str; GHHav12][
if(str.GetAt(str.GetLength()-1)!='\\') bg3"W,bv%
m_Path+="\\"; Ga^Zb^y
UpdateData(FALSE); 8-lOB
} 5 gv/Pq &
!
/NG.Wf
void CCaptureDlg::SaveBmp() )6w}<W*1E
{ fnNYX]_bk
CDC dc; T`9u!#mT=
dc.CreateDC("DISPLAY",NULL,NULL,NULL); m1IKVa7-\}
CBitmap bm; 6sE{{,OGB
int Width=GetSystemMetrics(SM_CXSCREEN); !p[9{U->o;
int Height=GetSystemMetrics(SM_CYSCREEN); g(Io/hyj
bm.CreateCompatibleBitmap(&dc,Width,Height); #!$GH_
CDC tdc; `c69?/5
tdc.CreateCompatibleDC(&dc); K^ 3co
CBitmap*pOld=tdc.SelectObject(&bm); ^<:sdv>Y5
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0V{(Ru.O
tdc.SelectObject(pOld); 4_UU<GEp
BITMAP btm; S<L.c
bm.GetBitmap(&btm); tU^kQR!
DWORD size=btm.bmWidthBytes*btm.bmHeight; eXkujjSw"
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); h8X g`C\
BITMAPINFOHEADER bih; !bD@aVf?5
bih.biBitCount=btm.bmBitsPixel; d @*GUmJ
bih.biClrImportant=0; [F*4EGB
bih.biClrUsed=0; wBInq~K_
bih.biCompression=0; xxm%u9@s
bih.biHeight=btm.bmHeight; v"MX>^/<
bih.biPlanes=1; ] )"u+
bih.biSize=sizeof(BITMAPINFOHEADER); {w8 NN-n
bih.biSizeImage=size; U^.4Hy&D
bih.biWidth=btm.bmWidth; Lj"A4i_
bih.biXPelsPerMeter=0; ;=9
>MS}
bih.biYPelsPerMeter=0; }HG#s4
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "ywh9cp
static int filecount=0; iz~
pGkt
CString name; Yyfq
name.Format("pict%04d.bmp",filecount++); O$g_@B0E1
name=m_Path+name; ~+H"
-+
BITMAPFILEHEADER bfh; -wv6s#"u
bfh.bfReserved1=bfh.bfReserved2=0; .p ls!
bfh.bfType=((WORD)('M'<< 8)|'B'); cNKUu~C+
bfh.bfSize=54+size; Y9=(zOqv
bfh.bfOffBits=54; 6MG9a>=
CFile bf; {0@&OO:w
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +@Ad1fJi
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Pa^A$fy\
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c.|l-zAeX
bf.WriteHuge(lpData,size); 1TM~*<Jb
bf.Close(); teW6;O_
nCount++; )%X;^(zKM
} #$1og=
GlobalFreePtr(lpData); kip`Myw+
if(nCount==1) W{5:'9,
m_Number.Format("%d picture captured.",nCount); @<@SMK)
else #-Z8Z
i"44
m_Number.Format("%d pictures captured.",nCount); ]=EM@
UpdateData(FALSE); 7JDN{!jT
} ]O`
{dnP
{&[9iIf
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j.i#*tN//
{ BT_tOEL#
if(pMsg -> message == WM_KEYDOWN) : 5U"XY x@
{ ;D.h65rr
if(pMsg -> wParam == VK_ESCAPE) m))<!3
return TRUE; &5%dhc4&!&
if(pMsg -> wParam == VK_RETURN) c DrebU
return TRUE; 2T)sXB u
} 6QNs\Ucb+
return CDialog::PreTranslateMessage(pMsg); !'f3>W\
} /:\3 \{?0m
P(SZ68
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "{E qhR~
{ vZ#!uU^a:
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f7hXQ|$
SaveBmp();
Q2p)7G
return FALSE; $>R(W=Q
} t0#[#I1+
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ i1oKrRv
CMenu pop; rxO2js
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [Qdq}FYr
CMenu*pMenu=pop.GetSubMenu(0); ir:d'g1k
pMenu->SetDefaultItem(ID_EXITICON);
?W0(|9
CPoint pt; )ZejQ}$
GetCursorPos(&pt); ;U`X 6d
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >~\w+^2f8
if(id==ID_EXITICON) _}mK!_`
DeleteIcon(); jAND7&W
else if(id==ID_EXIT) t=R6mjb
OnCancel(); 6S.~s6o,
return FALSE; =3 +l
} p\bFdxv#
LRESULT res= CDialog::WindowProc(message, wParam, lParam); tVqmn
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) X8<2L2:
AddIcon(); #)`A7 $/,
return res; 6<5Jq\-h
} &,i~ cG?
&s)0z)mR8&
void CCaptureDlg::AddIcon() 3,);0@I
{ 7W9~1
.SC
NOTIFYICONDATA data; IC{F.2D
data.cbSize=sizeof(NOTIFYICONDATA); Gy@7Xf
CString tip; m=b~i^@
tip.LoadString(IDS_ICONTIP); gor<g))\
data.hIcon=GetIcon(0); }'=h4yI
data.hWnd=GetSafeHwnd(); 0+b0<
strcpy(data.szTip,tip); On1v<SD$[
data.uCallbackMessage=IDM_SHELL; #vf_D?^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l#@&~f[
data.uID=98; p8, 0lo
Shell_NotifyIcon(NIM_ADD,&data); cX
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ShowWindow(SW_HIDE); 1Qh`6Ya f
bTray=TRUE; Z0fJ9HW
} L|^o71t|
DI&MC9j(
void CCaptureDlg::DeleteIcon() OK`Z@X_,bW
{ D22Lu;E
NOTIFYICONDATA data; q2_`v5t
data.cbSize=sizeof(NOTIFYICONDATA); t]^_l$
data.hWnd=GetSafeHwnd(); ,fnsE^}.U
data.uID=98; RP(/x+V
Shell_NotifyIcon(NIM_DELETE,&data); ewB!IJxh
ShowWindow(SW_SHOW); 8,o17}NY,
SetForegroundWindow(); 3AlqBXE"Z<
ShowWindow(SW_SHOWNORMAL); MFg'YA2/
bTray=FALSE; C%ytkzG_
} V+w u
hkW{88
void CCaptureDlg::OnChange() qSQ@p\O~
{ PMKb ]y
RegisterHotkey(); 135vZ:S
} zH'2s-.bi
+=8X8<Pu
BOOL CCaptureDlg::RegisterHotkey() FBsn;,3<W
{ /qxJgoa
UpdateData(); ,.g}W~S)
UCHAR mask=0; H2Eb\v`#
UCHAR key=0; gKL1c{BV
if(m_bControl) [xpQH?
mask|=4; M^H90GN)X
if(m_bAlt) 3:|-#F*k{
mask|=2; ]@SU4
if(m_bShift) 00M`%c/
mask|=1; p\U*;'hv
key=Key_Table[m_Key.GetCurSel()]; DMkhbo&+
if(bRegistered){ ?En7_X{C?
DeleteHotkey(GetSafeHwnd(),cKey,cMask); F@hYA
bRegistered=FALSE; (L|}`
} B4O6>'
cMask=mask; "E>t,
D
cKey=key; p,n\__
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); , deUsc
return bRegistered; 3#Y3Dz`
} Q-R}qy5y
V_;9TC
四、小结 %yaG,;>U
DuF7HTN[K
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。