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:
qpjY &3SI
/k#-OXP~ 一、实现方法
_5oTNL2 F^i3e31*t 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:
Wv;0PhF sZ.<:mu[ #pragma data_seg("shareddata")
(m~>W"x/ HHOOK hHook =NULL; //钩子句柄
=
tv70d' UINT nHookCount =0; //挂接的程序数目
4"d,=P.{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
7=G2sOC static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
S$6|KY u static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
ewZ?+G+m static int KeyCount =0;
mxa~JAlN_ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
]-=L7a #pragma data_seg()
3<0b_b )DSeXS[
e 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
(`x_MTLL 6#=jF[ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
*Rgr4-eS xEb>6+-F@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
|LHJRP-Z cKey,UCHAR cMask)
wwUI ;g {
#NS|9jW BOOL bAdded=FALSE;
\Z-th,t for(int index=0;index<MAX_KEY;index++){
zp:dArh0 if(hCallWnd[index]==0){
0YH5B5b hCallWnd[index]=hWnd;
-t`kb*O3` HotKey[index]=cKey;
?w3RqF@} HotKeyMask[index]=cMask;
=%Y1] F bAdded=TRUE;
YagfCi ? KeyCount++;
k(gbUlCc break;
K9!HW&?<| }
}LHYcNw^z }
]33!obM return bAdded;
TOwd+]B }
&?<uR)tl //删除热键
tpfgUZ{ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
TCr4-"`r-{ {
h\s/rZg=r BOOL bRemoved=FALSE;
]l,BUf-O for(int index=0;index<MAX_KEY;index++){
vygzL U^ if(hCallWnd[index]==hWnd){
' \JE># if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]#tB[G hCallWnd[index]=NULL;
!3Q0Ahf HotKey[index]=0;
~#_~DqbMZ5 HotKeyMask[index]=0;
:@A&HkF bRemoved=TRUE;
Y
},E3< KeyCount--;
Y(Q
0m|3P break;
>O'\
jp}$l }
_~kw^!p>Kr }
'Wlbh:=$ }
bJd|mm/v return bRemoved;
=i/Df? }
{)YbksrJ{ @rl5k( X! d-"[ DLL中的钩子函数如下:
Gh;\"Qx l;?:}\sI= LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
pUIN`ya[[ {
Q(|@&83]. BOOL bProcessed=FALSE;
A8{jEJ=)P if(HC_ACTION==nCode)
ZmA}i`
{
VB |?S|< if((lParam&0xc0000000)==0xc0000000){// 有键松开
``MO5${ switch(wParam)
K'A+V {
lriezI case VK_MENU:
|9*Rnm_ MaskBits&=~ALTBIT;
~7m`p3W@ break;
?<?Ogq"< case VK_CONTROL:
c%&,(NJ]K MaskBits&=~CTRLBIT;
m#"_x{oa break;
"?"
: case VK_SHIFT:
-&+:7t MaskBits&=~SHIFTBIT;
Cbbdq%ySI break;
~i,d%a default: //judge the key and send message
&l(T},-X break;
7)?C+=,0 }
H2X_WSwm for(int index=0;index<MAX_KEY;index++){
@0 +\:F if(hCallWnd[index]==NULL)
P1#g{f continue;
5Xq+lLW> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
xfk
-Ezv {
Yuv(4a<M% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
tXE/aY*I bProcessed=TRUE;
dOjly,! }
pF;.nt) }
b
74!Zw }
;-d b/$O else if((lParam&0xc000ffff)==1){ //有键按下
d$ouH%^cGu switch(wParam)
&RR;'wLoQT {
WQ|Ufl; case VK_MENU:
$^x=i;>aK. MaskBits|=ALTBIT;
Fh~9(Y# break;
/b+~BvTh case VK_CONTROL:
"4b{YWv MaskBits|=CTRLBIT;
o&JoeKXor break;
,!=
sGUQ) case VK_SHIFT:
5Tsz|k MaskBits|=SHIFTBIT;
"x$@^ break;
,&[o:jTk default: //judge the key and send message
X5WA-s(?0 break;
[P2>KQ\ }
SKG
U)Rn; for(int index=0;index<MAX_KEY;index++){
Np\NStx2 if(hCallWnd[index]==NULL)
snbXAx1L continue;
SSe;&Jk2d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
+y|
B"}x {
+17!v_4^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
.Xlo-gHk bProcessed=TRUE;
|nMjv]# }
01(U)F\ }
[* xdILj }
7F`\Gz_2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
qlhc"}5x } for(int index=0;index<MAX_KEY;index++){
fTxd8an{ if(hCallWnd[index]==NULL)
FB k7Cn! continue;
'4,?YcZ?S if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
`zoHgn7B9q SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
c |0p'EQ //lParam的意义可看MSDN中WM_KEYDOWN部分
(Mv~0ShakO }
6 (rm%c }
8\J$\Edv }
l;-2hZ return CallNextHookEx( hHook, nCode, wParam, lParam );
Tzd#!Lvm:, }
|Iy;_8c {$S"Sj 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:
F:zmO5L5 =Jp:dM* BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
O%t? -h BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
L7ae6#5. 5;`Ot2 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:
kEh9J>|M Wvb ~j LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
/&6{}n {
[3dGHf;miw if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
@(R=4LL {
g0 f4>m //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
VEV?$R7; SaveBmp();
1 |z4]R,< return FALSE;
jHEP1rNHE }
`8ob Xb …… //其它处理及默认处理
lhM5a
\ }
RFM;?!S A6z2KVk S{llpp{E 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
1
-Z&/3T] O0}uY:B 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
7\@c1e*e
IlJ"t`Z9) 二、编程步骤
:1d;jx> <gPM/4$G 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";
k7uX!} ~,,r\Y+ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
q,K|1+jn G
1{m" 1M 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;
wn"\@Qv G "]3o933D 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;
[kJ;Uxncz~ zE;|MU@| 5、 添加代码,编译运行程序。
BMq> Cj+ .QY>@b\ 三、程序代码
TY/'E#. Pk&=\i< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
8B ,S_0! #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
drpx"d[c #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
=LGM[Z3$s #if _MSC_VER > 1000
"9s}1C; Me #pragma once
x~k3kj #endif // _MSC_VER > 1000
ESviWCh0Fl #ifndef __AFXWIN_H__
JbEEI(Q>g #error include 'stdafx.h' before including this file for PCH
9q ]f]S.L #endif
`*[Kmb\ #include "resource.h" // main symbols
oW
OR7)?r class CHookApp : public CWinApp
ZQ"dAR/y {
I484cR2. public:
mN-O{k0\ CHookApp();
+:Xg7H* // Overrides
FM%WMyb[ // ClassWizard generated virtual function overrides
^/%o
I;O{ //{{AFX_VIRTUAL(CHookApp)
wsdZwik public:
sudh=_+> virtual BOOL InitInstance();
5NkF_&S_1 virtual int ExitInstance();
eP (*. //}}AFX_VIRTUAL
q AVypP?J //{{AFX_MSG(CHookApp)
8K^#$,.." // NOTE - the ClassWizard will add and remove member functions here.
xlcCL?qQj // DO NOT EDIT what you see in these blocks of generated code !
}<kl3{) //}}AFX_MSG
;0Uat DECLARE_MESSAGE_MAP()
P|1 D6 };
RrLj5 Jq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
j7d^ga-` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_W@sFv%sj BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
xTk6q*NvT^ BOOL InitHotkey();
[#wt3<d`) BOOL UnInit();
3N]ushMO #endif
b+Sj\3fX !pfpT\i]N: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
C!_=L?QT^ #include "stdafx.h"
eG+$~\%Fub #include "hook.h"
(]k Q9}8 #include <windowsx.h>
S#CaJ}M #ifdef _DEBUG
^?|4<Rm #define new DEBUG_NEW
Vuy%7H #undef THIS_FILE
t(<k4 ji, static char THIS_FILE[] = __FILE__;
/?BTET #endif
IUAe6 #define MAX_KEY 100
irh Z #define CTRLBIT 0x04
2K3j3 |T #define ALTBIT 0x02
l _2Xao$ #define SHIFTBIT 0x01
&n]v #pragma data_seg("shareddata")
-7oIphJ=\ HHOOK hHook =NULL;
Z9H2! Cp UINT nHookCount =0;
^0"fPG` static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
DmWa!5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
S^q^=q0F static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
m
Urb static int KeyCount =0;
r:rPzq1 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
5~>j98K #pragma data_seg()
~Y0K Wx4 HINSTANCE hins;
TN Z-0 void VerifyWindow();
-~sW@u)O BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
f*V^HfiQb //{{AFX_MSG_MAP(CHookApp)
p%Q{Rqc) // NOTE - the ClassWizard will add and remove mapping macros here.
io"NqR#"v // DO NOT EDIT what you see in these blocks of generated code!
zp4@T) //}}AFX_MSG_MAP
;B<rw^h5 END_MESSAGE_MAP()
+
S5uxO |-v/ CHookApp::CHookApp()
UU}Hs} {
UQI!/6F // TODO: add construction code here,
d:Z|It // Place all significant initialization in InitInstance
)-XD=
] }
]=3hH+1 a C(sz/x?11 CHookApp theApp;
w3iX "w LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
n\7>_ {
Z3<lJk\Y BOOL bProcessed=FALSE;
0LGHSDb if(HC_ACTION==nCode)
X+;#^A3 {
l d%#.~Q if((lParam&0xc0000000)==0xc0000000){// Key up
*?Oh%.HgF switch(wParam)
Mu.tq~b > {
e\#aQ1?" case VK_MENU:
?(khoL t MaskBits&=~ALTBIT;
8z-wdO\ break;
D41.$t[ case VK_CONTROL:
}WR@%)7ay MaskBits&=~CTRLBIT;
~urk
Uz break;
;Srzka2 case VK_SHIFT:
e*<pO@Uy MaskBits&=~SHIFTBIT;
nbw8YO(= break;
rIyIZWkI default: //judge the key and send message
t[({KbIy break;
/ H GPy }
J,h'eY5 for(int index=0;index<MAX_KEY;index++){
5OTZa>H if(hCallWnd[index]==NULL)
%h_N%B$7c1 continue;
#VZ-gy4$\B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.i7"qq.M {
;M+~e~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(h&=Na~ bProcessed=TRUE;
)
[)1 }
SQ/}K8uZ }
G{+zKs}~ }
gYpFF=7j<@ else if((lParam&0xc000ffff)==1){ //Key down
%~dn5t; switch(wParam)
qe uc^+P; {
98|1K>C case VK_MENU:
%@I= $8j MaskBits|=ALTBIT;
ip|l3m$ Mi break;
=m;cy0)) case VK_CONTROL:
HT_nxe`E MaskBits|=CTRLBIT;
%~<F7qB break;
mt *Dx case VK_SHIFT:
5M%)*.Y
3[ MaskBits|=SHIFTBIT;
| m#" break;
Sfi1bsK default: //judge the key and send message
0LWV.OIIC break;
P$__c{1\ }
\O>;,(>i for(int index=0;index<MAX_KEY;index++)
<UW-fI)X {
n2opy8J#! if(hCallWnd[index]==NULL)
tB0f+ wC continue;
SphP@J<ONW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w\JTMS$ {
&61h*s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-9 |)O: bProcessed=TRUE;
4?`*#DPl }
@Y%i`}T%( }
p13y`sU= }
^Y"|2 : if(!bProcessed){
oPxh+|0? for(int index=0;index<MAX_KEY;index++){
I_`$$-| if(hCallWnd[index]==NULL)
2N&S__ continue;
q' t" if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
@Bsvk9} SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
J32"Ytdo< }
RHI?_gf& }
y<ZT~e }
4g+o/+6!4 return CallNextHookEx( hHook, nCode, wParam, lParam );
ad<ZdO*h }
Xq$9H@. D'Kiy BOOL InitHotkey()
;k=`J {
1:Raa 5 if(hHook!=NULL){
ZyrVv\' nHookCount++;
]%(X}]} return TRUE;
_10I0Z0 }
|Mnc0Fgvy, else
8$ _8Yva"e hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
_.GHtu/I if(hHook!=NULL)
+qa^K%K nHookCount++;
!$0ozDmD return (hHook!=NULL);
e$-Y>Dd }
"2
qivJ BOOL UnInit()
F,xFeq$/{ {
@(m?j1!M if(nHookCount>1){
d?[8VfAnh nHookCount--;
GS,}]c= return TRUE;
Ye\&_w"
}
[58qC: BOOL unhooked = UnhookWindowsHookEx(hHook);
:W[d&e if(unhooked==TRUE){
s&W^?eKr nHookCount=0;
XAUHF-"WE hHook=NULL;
5Kkp1K$M }
qc/)l~]?g{ return unhooked;
%Xl(wvd }
NHD`c)Q t|59/R BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
97^)B4 {
E#yG}UWe BOOL bAdded=FALSE;
!h+VbZ for(int index=0;index<MAX_KEY;index++){
#PMi6q~Z if(hCallWnd[index]==0){
:
UDh{GQ* hCallWnd[index]=hWnd;
Uclta HotKey[index]=cKey;
KCS},X_ HotKeyMask[index]=cMask;
"IzM: bAdded=TRUE;
u:}yE^8 @ KeyCount++;
rUBc5@| break;
(p? B= }
>'{'v[qR[G }
b59NMGn return bAdded;
7eyx cr;z }
l\&Tw[O . L]!* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
L@~0`z:>iP {
#D Oui] BOOL bRemoved=FALSE;
M~djX} #\ for(int index=0;index<MAX_KEY;index++){
jGKI|v4U( if(hCallWnd[index]==hWnd){
]]V|]}<)m if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Ft 2u&Rtx hCallWnd[index]=NULL;
C<q@C!A HotKey[index]=0;
(x8D ]a HotKeyMask[index]=0;
$&FeR*$|g bRemoved=TRUE;
MMyJAGh
^G KeyCount--;
8'VcaU7Nh break;
Ehg(xK }
i/q1> }
R?J=5tO }
`>\>'V<& return bRemoved;
Kfs|KIQ>= }
VuA)Ye f>ilk Q` void VerifyWindow()
9Z. WR-} {
K7]+. f for(int i=0;i<MAX_KEY;i++){
=U3rOYbP; if(hCallWnd
!=NULL){ _iZ9Ch\
if(!IsWindow(hCallWnd)){ %8! }" Xa
hCallWnd=NULL; 0)9'x)l:
HotKey=0;
pytF
K)U
HotKeyMask=0; aF:|MTC(~
KeyCount--; K`twbTU
} M>|R&v
} eW;0{P
} p7]V1w :
} sEEyN3 N
z-;{pPZ
BOOL CHookApp::InitInstance() 5VK.Zs\
{ +{H0$4y
AFX_MANAGE_STATE(AfxGetStaticModuleState()); \WZ]'o6
hins=AfxGetInstanceHandle(); >vc$3%L[$
InitHotkey(); VK]sK e
return CWinApp::InitInstance(); s92SN F}g
} 2sahb#e
)
.L))EB
int CHookApp::ExitInstance() %j2ZQ/z
{ >Ef{e6
VerifyWindow(); vFl06N2
UnInit(); L
[=JHW
return CWinApp::ExitInstance(); I@o42% w2
} Eh|v>Yew
#@K
%Mx
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9 az{j1
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rCgoU
xW`
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ \[W)[mH_
#if _MSC_VER > 1000 M%qHf{ B
#pragma once <~-cp61z;
#endif // _MSC_VER > 1000 NKE,}^C
N9gbj%+
class CCaptureDlg : public CDialog y-^m
{ PuGc{kt
// Construction -)$5[jM]
public: )~H&YINhn
BOOL bTray; #Bi8>S
BOOL bRegistered; B0"55g*c
BOOL RegisterHotkey(); ad,pHJ`
UCHAR cKey; _/@u[dWeL
UCHAR cMask; KBy*QA
void DeleteIcon(); SH/^qDT'
void AddIcon(); YuKg|<WO
UINT nCount; =p7eP
void SaveBmp(); ,K~r':ht
CCaptureDlg(CWnd* pParent = NULL); // standard constructor S_dM{.!Z(,
// Dialog Data 2 s<uT
//{{AFX_DATA(CCaptureDlg) Zsx\GeE%:
enum { IDD = IDD_CAPTURE_DIALOG }; KkD&|&!Q7u
CComboBox m_Key; VJ()sbl{k
BOOL m_bControl; &BS*C} },
BOOL m_bAlt; j55;E
E!
BOOL m_bShift; qCku
q
CString m_Path; ud:5_*
CString m_Number; CKr5L
//}}AFX_DATA Eu1t*>ZL
// ClassWizard generated virtual function overrides <X~P62<
//{{AFX_VIRTUAL(CCaptureDlg) \O(~:KN
public: .<kbYo:MV
virtual BOOL PreTranslateMessage(MSG* pMsg); PQA}_o
protected: 6PdLJ#LS
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xfADks2w
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yHjuT+/wM,
//}}AFX_VIRTUAL \S[I:fw#&
// Implementation t @vb3
protected: P&}J(;Lbl
HICON m_hIcon; mB<*we
// Generated message map functions ?$Jj^/luD
//{{AFX_MSG(CCaptureDlg) RA$q{$arb
virtual BOOL OnInitDialog(); VFLW@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \ICc?8oL
afx_msg void OnPaint(); y;xY74Nq
afx_msg HCURSOR OnQueryDragIcon(); 8\B]!
virtual void OnCancel(); Gx/kel[Y}
afx_msg void OnAbout(); @z1pE@7jK
afx_msg void OnBrowse(); kYnp$8
afx_msg void OnChange(); ;X)b=
//}}AFX_MSG Bbzmq
DECLARE_MESSAGE_MAP() ]x:>!y
}; 3T84f[CFJ
#endif br4?_,
1XPYI
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }\3jcnn
#include "stdafx.h" \_8.\o"@*#
#include "Capture.h" 9U]j@*QN
#include "CaptureDlg.h" c@Q&i
#include <windowsx.h> cyPJ(&;
#pragma comment(lib,"hook.lib") %E*Q0/
#ifdef _DEBUG o#9Q
#define new DEBUG_NEW 3*!w c.=
#undef THIS_FILE ]@A}v\wa
static char THIS_FILE[] = __FILE__; >Pf\"%*
#endif xnvG5
#define IDM_SHELL WM_USER+1 r%412#
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t5;)<N`
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gUHx(Fi[4
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dBNx2T}_0
class CAboutDlg : public CDialog L5 Q^cY]p
{ jHQnD]Hr
public: j`:D BO&)\
CAboutDlg(); DuI>z?bS
// Dialog Data /wT<p
//{{AFX_DATA(CAboutDlg) J1g+H2
enum { IDD = IDD_ABOUTBOX }; Eu|O<9U\
//}}AFX_DATA S?<hs,
// ClassWizard generated virtual function overrides fOJTy0jX8
//{{AFX_VIRTUAL(CAboutDlg) v$~$_K
protected: eI3ZV^_Ps
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SI,
t:=D
//}}AFX_VIRTUAL vtF|:*h
// Implementation EaKbG>
protected: ><i: P*ht
//{{AFX_MSG(CAboutDlg) E_-QGE/1
//}}AFX_MSG P^[y~I#{
DECLARE_MESSAGE_MAP() _bn
"c@s
}; 9>9,
yV?qX\~*
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2uLBk<m5c
{ j06qr\Es
//{{AFX_DATA_INIT(CAboutDlg) 7(l>Ck3B#
//}}AFX_DATA_INIT za!8:(
} r t'pc\|O&
TXo`P_SE
void CAboutDlg::DoDataExchange(CDataExchange* pDX) kJK*wq]U6
{ Wn-'iD+9<
CDialog::DoDataExchange(pDX); kwUy^"O
//{{AFX_DATA_MAP(CAboutDlg) w0^}c8%WR
//}}AFX_DATA_MAP SW)jDy
} )=pa*
zvK'j"Wq=
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) D`R~d;U~
//{{AFX_MSG_MAP(CAboutDlg) SFR<T
// No message handlers ;cfPS
//}}AFX_MSG_MAP <S3s==Cg
END_MESSAGE_MAP() &a.A8v)
)fQ1U
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'Y0h w
: CDialog(CCaptureDlg::IDD, pParent) G j^*
{ lc\{47LwZ
//{{AFX_DATA_INIT(CCaptureDlg)
mx5#K\
m_bControl = FALSE; qPBOt;N
m_bAlt = FALSE; )kD B*(?
m_bShift = FALSE; nrg$V>pD
m_Path = _T("c:\\"); d9up!
k
m_Number = _T("0 picture captured."); 'P)c'uqd#
nCount=0; X& mD/1
bRegistered=FALSE; H3LuRGe&2
bTray=FALSE; b|e1HCH
//}}AFX_DATA_INIT xVk5%
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ey=ymf.}
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); qe'RvBz
} 3~1Gts
54].p7
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) fcO|0cQ
{ iDWM-Ytx
CDialog::DoDataExchange(pDX); CaC \\5wl
//{{AFX_DATA_MAP(CCaptureDlg) $,zW0</P*l
DDX_Control(pDX, IDC_KEY, m_Key); V1haAP[#
DDX_Check(pDX, IDC_CONTROL, m_bControl); z(Z7[#.
DDX_Check(pDX, IDC_ALT, m_bAlt); R@){=8%z
DDX_Check(pDX, IDC_SHIFT, m_bShift); dhjX[7Bl9
DDX_Text(pDX, IDC_PATH, m_Path); P$Q,t2$A
DDX_Text(pDX, IDC_NUMBER, m_Number); +;-ZU
//}}AFX_DATA_MAP 0:`*xix
} QP/ZD|/ t1
G*_qqb{B
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)
&Ufp8[
//{{AFX_MSG_MAP(CCaptureDlg) nyetK
ON_WM_SYSCOMMAND() l <p(zLR
ON_WM_PAINT() C1>zwU_zo
ON_WM_QUERYDRAGICON() 05:?5M4};
ON_BN_CLICKED(ID_ABOUT, OnAbout) _F8THYg (
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jZD)c_'U
ON_BN_CLICKED(ID_CHANGE, OnChange) /DjsnU~3
//}}AFX_MSG_MAP aWPf3Q
END_MESSAGE_MAP() bgxk:$E
`<{LW>Lb
BOOL CCaptureDlg::OnInitDialog() "
sC]z}
{ />N# PF
CDialog::OnInitDialog(); vVP.9(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); yi:}UlO
ASSERT(IDM_ABOUTBOX < 0xF000); l(W?]{C[%
CMenu* pSysMenu = GetSystemMenu(FALSE); >qs/o$+t}
if (pSysMenu != NULL) 1R;@v3
{ O>'tag
CString strAboutMenu; (%OZ `?`
strAboutMenu.LoadString(IDS_ABOUTBOX); "j&'R#$&d
if (!strAboutMenu.IsEmpty()) Zrp-Hv27,,
{ wJD'q\n
pSysMenu->AppendMenu(MF_SEPARATOR); N<ux4tz
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w{t]^w:
} mFeR~Bi>!
} zdw*
?C
SetIcon(m_hIcon, TRUE); // Set big icon wX$|(Y}
SetIcon(m_hIcon, FALSE); // Set small icon Zl>dBc%
m_Key.SetCurSel(0); f >.^7.is
RegisterHotkey(); 0'
oXA'L-J
CMenu* pMenu=GetSystemMenu(FALSE); F]t=5
-O<
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +u&[ j/
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F-$!e?,H
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9)t[YE:U3!
return TRUE; // return TRUE unless you set the focus to a control TW|- 0
} vZW[y5
8+J>jZ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) r6kJV4I=re
{ DJ*mWi.
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "iR:KW@
{ [:(/cKo
CAboutDlg dlgAbout; ALV(fv$cD
dlgAbout.DoModal(); c&I
} e`:^7$
else ,@/O\fit)
{ \m%c"'[
CDialog::OnSysCommand(nID, lParam); QM*
T?PR
} ]-9w'K d
} Rj4C-X4=
vQ]d?Tp
void CCaptureDlg::OnPaint() ([
-i5
{ U1HG{u,"y
if (IsIconic()) D6H?*4f]
{ $8xb|S[
CPaintDC dc(this); // device context for painting p_(En4QSH
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
rlGv6)vb
// Center icon in client rectangle -7]j[{?w
int cxIcon = GetSystemMetrics(SM_CXICON); reNf?7G+m
int cyIcon = GetSystemMetrics(SM_CYICON); [sjkm+
?
CRect rect; % P Ex
GetClientRect(&rect); EZN!3y| m
int x = (rect.Width() - cxIcon + 1) / 2; g8l6bh$}
int y = (rect.Height() - cyIcon + 1) / 2; H%X F~tF:
// Draw the icon l?
U!rFRq`
dc.DrawIcon(x, y, m_hIcon); ".%d{z}vz
} KPI96P
else 3h:y[Vm#9y
{ gnjhy1o
CDialog::OnPaint(); /`7+Gy<
} |35OA/O?X
} 'A^q)hpax
[61*/=gWe
HCURSOR CCaptureDlg::OnQueryDragIcon() K,I
{ k@un}}0r
return (HCURSOR) m_hIcon; w#[cGaIB
} 3fp&iz
R^$|D)(
void CCaptureDlg::OnCancel() ;Xy=;Z.]i
{ 2,F9P+
if(bTray) '5 ~cd
DeleteIcon(); as|w} $
CDialog::OnCancel(); PCHspe9!y
} )Z:D}r8[
W>i"p~!
void CCaptureDlg::OnAbout() /.<v,CR
{ Y#XRn_2D
CAboutDlg dlg; as!a!1
dlg.DoModal(); * 70ZAo4
} \0d'y#Gp*
,aLwOmO
void CCaptureDlg::OnBrowse() )0iN2L]U;
{ E "}@SaB-
CString str; : S3+UT
BROWSEINFO bi; _1&Ar4:
char name[MAX_PATH]; 9i}$245lB
ZeroMemory(&bi,sizeof(BROWSEINFO)); y:}qoT_.
bi.hwndOwner=GetSafeHwnd(); TKv!wKI
bi.pszDisplayName=name; a!E22k?((z
bi.lpszTitle="Select folder"; *$W&jfW
bi.ulFlags=BIF_RETURNONLYFSDIRS; |:&6eDlR
LPITEMIDLIST idl=SHBrowseForFolder(&bi); n\l?+)S *
if(idl==NULL) &v0-$
return; m;]wKd"
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); CpmT*
str.ReleaseBuffer(); %ACW"2#(
m_Path=str; m|B=
if(str.GetAt(str.GetLength()-1)!='\\') *
l1*zaE
m_Path+="\\"; ;_)~h$1%=
UpdateData(FALSE); 3g;,
} +Gt9!x}#e
1QG q;6\
void CCaptureDlg::SaveBmp() ]FZPgO'G
{ y'`/^>.
CDC dc; ft6)n T/"&
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8zD>t~N2C
CBitmap bm; !43!JfD
int Width=GetSystemMetrics(SM_CXSCREEN); l^9gFp~I
int Height=GetSystemMetrics(SM_CYSCREEN); NBY|U{.g
bm.CreateCompatibleBitmap(&dc,Width,Height); qrYbc~jI7
CDC tdc; uW(-?
tdc.CreateCompatibleDC(&dc); ^ls@Gr7`P
CBitmap*pOld=tdc.SelectObject(&bm); v62_VT2v
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Ze eV-
tdc.SelectObject(pOld); +h4W<YnW
BITMAP btm; c\1X NPGG
bm.GetBitmap(&btm); @%R4V[Lo.
DWORD size=btm.bmWidthBytes*btm.bmHeight; ERV]N:(
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p@su:B2Rl
BITMAPINFOHEADER bih; 2CO/K_Q
bih.biBitCount=btm.bmBitsPixel; z{
:;Rb
bih.biClrImportant=0; 'R79,)|;[
bih.biClrUsed=0; :xPo*#[Z(A
bih.biCompression=0; "mW'tm1+
bih.biHeight=btm.bmHeight; gCb+hQq\
bih.biPlanes=1; 2URGd#{VQ
bih.biSize=sizeof(BITMAPINFOHEADER); &Mk!qE<:N
bih.biSizeImage=size; ]=qauf>3
bih.biWidth=btm.bmWidth; oCaYmi=:
bih.biXPelsPerMeter=0; J8alqs7
bih.biYPelsPerMeter=0; + U5Q/g
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); wW@e#:
static int filecount=0; )N&SrzqTK
CString name; LJGpa )(
name.Format("pict%04d.bmp",filecount++); 9kH~=`: ?
name=m_Path+name; $u!(F]^
BITMAPFILEHEADER bfh; 1+;bd'Ie
bfh.bfReserved1=bfh.bfReserved2=0; }}=n]_f
bfh.bfType=((WORD)('M'<< 8)|'B'); E]OexRJ^i
bfh.bfSize=54+size; N| DI
k
bfh.bfOffBits=54; qY#*LqV
CFile bf; UhDQl%&He
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]- 1(r,
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Xb%q9Z
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); K=[7<b,:3
bf.WriteHuge(lpData,size); 9efDM
bf.Close(); &-yRa45?
nCount++; (XO=W+<'
} h9H z6
>
GlobalFreePtr(lpData); 4d@yAr}
if(nCount==1) 5qtk#FB
m_Number.Format("%d picture captured.",nCount); j%Au0k
else rUb{iU;~m
m_Number.Format("%d pictures captured.",nCount); ;`78h?`
UpdateData(FALSE); 2!sPgIz
} E(r_mF7:
V#7,vas
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,=u;1
{ sm/aL^4
if(pMsg -> message == WM_KEYDOWN) ?% 24M\
{ .*-8rOcc
if(pMsg -> wParam == VK_ESCAPE) 5E'/8xp bB
return TRUE; rv*{[K
if(pMsg -> wParam == VK_RETURN) L3, /7
return TRUE; c| ^I}
} SsZC g#i
return CDialog::PreTranslateMessage(pMsg); ?Ij(B}D
} lFBpNUnzU
2 ?t@<M]
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ttsR`R1.k
{ lvke!~#
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ +;KUL6
SaveBmp(); 6dIPgie3w
return FALSE; 3CoZ2
} ##rkyd
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ e"S?qpJK
CMenu pop; P51M?3&=l
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R5uG.Oj-2
CMenu*pMenu=pop.GetSubMenu(0); bw P=f.
pMenu->SetDefaultItem(ID_EXITICON); ,>a!CnK=
CPoint pt; 90Ki.K 0
GetCursorPos(&pt); k:Pn.<
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~XTC:6ts
if(id==ID_EXITICON) ~S8:xG+s
DeleteIcon(); Qo#]Lo> \g
else if(id==ID_EXIT) V+E8{|dYL
OnCancel(); 8Sr'
return FALSE; {v|!];i
} ^1S{::
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ks#3
o+
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) TJ"-cWpO1
AddIcon(); xnZnbgO+
return res; )zr*Ecz
} BiYxI{V FD
b)d;eS
void CCaptureDlg::AddIcon() BDI|z/~&
{ zZ=SAjT QP
NOTIFYICONDATA data; :<J7 g`f
data.cbSize=sizeof(NOTIFYICONDATA); {=Zy;Er
CString tip;
}4|EHhG
tip.LoadString(IDS_ICONTIP); ~Gu$EqQ
data.hIcon=GetIcon(0); Ek{Q NlQ]4
data.hWnd=GetSafeHwnd(); 0caZ_-zU
strcpy(data.szTip,tip); #r'MfTr
data.uCallbackMessage=IDM_SHELL; &b} \).5E
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; uHg q"e
data.uID=98; a{nR:zPE
Shell_NotifyIcon(NIM_ADD,&data); ` 2W^Ui,4
ShowWindow(SW_HIDE); vjS`;^9
bTray=TRUE; E_ns4k#uG
} 3`^@ymY
eYUb>M)
void CCaptureDlg::DeleteIcon() V]zc-gYI
{ <\&9Odqc
NOTIFYICONDATA data; TR DQ+Z
data.cbSize=sizeof(NOTIFYICONDATA); aK_5@8+ZD
data.hWnd=GetSafeHwnd(); F)^0R%{C
data.uID=98; :21d
Shell_NotifyIcon(NIM_DELETE,&data); RA0;f'"`
ShowWindow(SW_SHOW); ) D@j6r
SetForegroundWindow(); +{:uPY#1
ShowWindow(SW_SHOWNORMAL); cb}zCl
j o
bTray=FALSE; *[[Gu^t^!
} d0(zB5'}
E4X6f
void CCaptureDlg::OnChange() y :;.r:
{ 9;@p2t*v
RegisterHotkey(); F/oqYk9`
} q1}!O kr"2
xuioU
BOOL CCaptureDlg::RegisterHotkey() ;U* /\+*h
{ /v
8"i^;}
UpdateData(); [^qT?se{
UCHAR mask=0; Ob$``31{s
UCHAR key=0; w(oK
if(m_bControl) WNyW1?"
mask|=4;
!VGG2N8
if(m_bAlt) IoDT
mask|=2; r: K1PO
if(m_bShift) }+@9[Q
L
mask|=1; MAek856
key=Key_Table[m_Key.GetCurSel()]; o "VKAP
if(bRegistered){ d[a(uWEl
DeleteHotkey(GetSafeHwnd(),cKey,cMask); J,Sa7jv[
bRegistered=FALSE; #3&@FzD_P
} =CLPz8
cMask=mask; "hk#pQ
cKey=key; e*:K79y
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); | v!N1+v0
return bRegistered; QOWGQl%!
} Bj@>iw?g'
;R?@
D]
四、小结 0AB a&'h
p'jc=bL E
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。