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:
n=?wX#rEC#
3H|drj:KV 一、实现方法
/D964VR1M\ TfHL'u9B 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:
Ns]$+| jVh:Bw #pragma data_seg("shareddata")
N`~f77G HHOOK hHook =NULL; //钩子句柄
LTB
rg[X UINT nHookCount =0; //挂接的程序数目
hkdF static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
*5{1.7 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
#8~ygEa} static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
>!Xj%RW static int KeyCount =0;
(\o4 c0UzK static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
;y-:)7J #pragma data_seg()
bGkLa/?S AD+OQLG]` 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
U8-OQ:2. UA(4mbz+ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
P- +]4\ Fv$A%6;W BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*Ms&WYN- cKey,UCHAR cMask)
+o):grWvQ {
I0qJr2[X~ BOOL bAdded=FALSE;
sWB@'P:x for(int index=0;index<MAX_KEY;index++){
3V7WIj< if(hCallWnd[index]==0){
y0-UO+; hCallWnd[index]=hWnd;
?1zGs2Qs HotKey[index]=cKey;
=:!>0~ HotKeyMask[index]=cMask;
G"tlJ7$myQ bAdded=TRUE;
IZ\fvYp KeyCount++;
OCq5}%yU&i break;
f( Dtv }
/Kq'3[d8 }
BO7XN; return bAdded;
K|OPtYeb }
<EcxNj1 //删除热键
UR9\g( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
M< .1U?_# {
?#fm-5WIi BOOL bRemoved=FALSE;
BoST?"&}' for(int index=0;index<MAX_KEY;index++){
|)C*i if(hCallWnd[index]==hWnd){
~I9o* cq if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
fms(_Q:R? hCallWnd[index]=NULL;
0igB pHS HotKey[index]=0;
L[A?W HotKeyMask[index]=0;
La3rX bRemoved=TRUE;
||.Hv[
]V* KeyCount--;
.gzfaxi break;
IF-y/] }
e$2P/6k> }
FvYciU! }
(CgvI*O return bRemoved;
wW/q#kc }
A_WaRYG ;E[Q/
tr:w i pl,{ DLL中的钩子函数如下:
$45.*>, zx,9x*g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
f$n5$hJlQ {
:=TIq BOOL bProcessed=FALSE;
U*E)y7MY if(HC_ACTION==nCode)
nxx/26{
{
D6l.x]K if((lParam&0xc0000000)==0xc0000000){// 有键松开
B /w&Lo switch(wParam)
^Y+Lf]zz* {
iU37LODa2T case VK_MENU:
Mp>(cs MaskBits&=~ALTBIT;
B2P@9u|9 break;
vp.?$(L^@/ case VK_CONTROL:
AO]cnhC MaskBits&=~CTRLBIT;
OG$v"Yf~ break;
T_=WX_h $ case VK_SHIFT:
MpGG}J[y MaskBits&=~SHIFTBIT;
EG|dN(qh break;
D>@NYqMF default: //judge the key and send message
c.b| RM0; break;
Mqvo
j7 }
jl&Nphp for(int index=0;index<MAX_KEY;index++){
H,5]w\R6\ if(hCallWnd[index]==NULL)
qP<D9k> continue;
Rz|@BxB>n if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X?wZ7*'1 {
!khEep} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
/e?0Iv"
8> bProcessed=TRUE;
S#v3%)R }
\`xlD&F@U }
dXQ C}JA }
Iia.`"S else if((lParam&0xc000ffff)==1){ //有键按下
%Q0R]
Hg switch(wParam)
:S_]!'H {
xk%
62W case VK_MENU:
{.jW"0U MaskBits|=ALTBIT;
t(-,mw break;
O0xqA\ case VK_CONTROL:
~'KqiUY MaskBits|=CTRLBIT;
L/exR6M7 break;
BLO ]78
case VK_SHIFT:
D_0Vu/v MaskBits|=SHIFTBIT;
Q= xXj'W- break;
L*[3rqER default: //judge the key and send message
,&WwADZ-s break;
y^`JWs, }
T-6<qh for(int index=0;index<MAX_KEY;index++){
yG/!K uA if(hCallWnd[index]==NULL)
?X6}+ continue;
-dBWpT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oq+w2yR {
adX"Yg!`{c SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
|oXd4 bProcessed=TRUE;
@|c]) }
-HQbvXAS }
SnmUh~`L~ }
*1<kYrB if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
($[+dR for(int index=0;index<MAX_KEY;index++){
XgHJ Oqt if(hCallWnd[index]==NULL)
T TN!$?G3 continue;
pLtw|S'4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7
s5(eQI SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
yW=+6@A4 //lParam的意义可看MSDN中WM_KEYDOWN部分
%NxQb' }
&~H ed_ }
@
gWd
}
n%7?G=_kj return CallNextHookEx( hHook, nCode, wParam, lParam );
F. SB_S<' }
`{G&i\"n R/ZScOW[ 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:
UE.kR+1 =zcvR {Dkp BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
XH$r(@Z\7 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
QE\
[EI2 gYc]z5` 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
c_D(%Vf5 hcj}6NXc LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
o6k#neB>=. {
k_=yb^6[U if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
'%QCNO/ {
E>|X'I?r^ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
+SH{`7r SaveBmp();
_xp8*2~- return FALSE;
0B]q /G( }
WK>|IgK …… //其它处理及默认处理
.+/d08] }
xf]K 7#0buXBg c>B1cR
将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
DVL-qt\;n ,KW
Q
6 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
l?U=s7s0? T$xBH 二、编程步骤
h^yqrDyJ <h7cQ 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";
YB5"i9T2 $Iwvecn?I 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
8Y?M:^f~ MY^{[#Q 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
}'$PYAf6 <OMwi9 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;
R-13DVK FmL]|~ 5、 添加代码,编译运行程序。
*j%x z~
cW, 三、程序代码
}X&rJV Q5+1'mzAB ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
kOYUxr.b #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<1D|TrP #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
4I$Y(E} #if _MSC_VER > 1000
:aesG7=O #pragma once
|1U_5w #endif // _MSC_VER > 1000
E7:xPNU #ifndef __AFXWIN_H__
NBYJ'nA%;f #error include 'stdafx.h' before including this file for PCH
]:|B). #endif
6p9fq3~7Y #include "resource.h" // main symbols
@NiuT%#c class CHookApp : public CWinApp
fjh|V9H {
Z[oF4 z public:
m9 h '!X< CHookApp();
#Iw(+%D // Overrides
b(Nv`'O // ClassWizard generated virtual function overrides
$9)os7H7 //{{AFX_VIRTUAL(CHookApp)
CL=%eSsuD public:
R6+)&:Ab{R virtual BOOL InitInstance();
p)y5[HX virtual int ExitInstance();
B>,eHXW //}}AFX_VIRTUAL
pHV^Kv# //{{AFX_MSG(CHookApp)
a+w2cN' // NOTE - the ClassWizard will add and remove member functions here.
#De>EQ% // DO NOT EDIT what you see in these blocks of generated code !
sdFHr4 //}}AFX_MSG
s2;~FK#/ DECLARE_MESSAGE_MAP()
V(MYReaPC] };
$|N6I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
qX\*lm/l BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wPlM=
.Hq? BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-@pjEI BOOL InitHotkey();
8dGsV5" * BOOL UnInit();
ON :t"z5 #endif
@!sK@&ow@% 17LhgZs& //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
6 d-\+t8 #include "stdafx.h"
VmS_(bM #include "hook.h"
wZqYtJ #include <windowsx.h>
Ez3fL&* #ifdef _DEBUG
I652Fcj #define new DEBUG_NEW
ARKM[] #undef THIS_FILE
HBlk~eZ static char THIS_FILE[] = __FILE__;
HK;NR.D #endif
DB'v7
Ij0 #define MAX_KEY 100
F B]Y~;( #define CTRLBIT 0x04
\TV #define ALTBIT 0x02
5\ mRH #define SHIFTBIT 0x01
pgU[di #pragma data_seg("shareddata")
}A)\bffH HHOOK hHook =NULL;
Pvxb6\G&d UINT nHookCount =0;
)(iv#;ByL static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
F.9}jd{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
oaIk1U;g static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
7sot?gF static int KeyCount =0;
YF%gs{ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
~6G
`k^!
#pragma data_seg()
c;l!i- HINSTANCE hins;
NR4+&d void VerifyWindow();
e4z`:%vy BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
,}oAc //{{AFX_MSG_MAP(CHookApp)
PX:#+bq1 // NOTE - the ClassWizard will add and remove mapping macros here.
{,>G 1>Yv // DO NOT EDIT what you see in these blocks of generated code!
P}R:o //}}AFX_MSG_MAP
amBg<P`'_ END_MESSAGE_MAP()
d0El2Ct8 gabfb# CHookApp::CHookApp()
I/E 9: {
TW|K.t@5#H // TODO: add construction code here,
Ak'=l; // Place all significant initialization in InitInstance
<,i4Ua }
55S s%$k@ 6^`iuC5 CHookApp theApp;
[vg&E
)V LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
JZ5k3#@e {
wJp<ZL BOOL bProcessed=FALSE;
fBS a8D3}` if(HC_ACTION==nCode)
X8C7d6ca {
NxP(&M( if((lParam&0xc0000000)==0xc0000000){// Key up
t7=D$ua switch(wParam)
#M-!/E {
-|>~I#vY case VK_MENU:
>`WQxkpy MaskBits&=~ALTBIT;
uCt?(E> break;
MYJMZ3qBi case VK_CONTROL:
Ta3* G MaskBits&=~CTRLBIT;
cAx$W6S break;
A]%*ye"NT case VK_SHIFT:
V~8]ag4 MaskBits&=~SHIFTBIT;
F1}d@^K
7d break;
LGtw4'yr default: //judge the key and send message
#xR=U" break;
D0_CDdW%7 }
TrgKl2xfx for(int index=0;index<MAX_KEY;index++){
!mVq+_7] if(hCallWnd[index]==NULL)
/&qE,>hd.+ continue;
7#&Q-3\: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tJ7tZ~Ak {
Jz0AYiCq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
KAVkYL0 bProcessed=TRUE;
mWP&N#vwh }
{a2Gb }
);S8`V }
@d8Nr: else if((lParam&0xc000ffff)==1){ //Key down
@5??`n switch(wParam)
_9=cxwi<w {
[k%u$ case VK_MENU:
5|}u25J MaskBits|=ALTBIT;
P~&J@8)c break;
;i [;% case VK_CONTROL:
9[&q
C MaskBits|=CTRLBIT;
2H] 7 =j break;
3 l
j^I case VK_SHIFT:
N3)n** MaskBits|=SHIFTBIT;
_K!)0p break;
;eW)&qzK default: //judge the key and send message
_$vbb#QXZG break;
X-CoC
}
,t*H: * for(int index=0;index<MAX_KEY;index++)
lQRtsmZ0 {
D)[( if(hCallWnd[index]==NULL)
K|D1 continue;
0\k{v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
4,=;:#n,J {
<&((vrfa SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
05jjLM'e bProcessed=TRUE;
m3(p7Z^Bq }
cQ`0d3 }
Da)_O JYE }
m*lcIa if(!bProcessed){
_Db&f}.` for(int index=0;index<MAX_KEY;index++){
JZ>
(h if(hCallWnd[index]==NULL)
(7$BF~s:, continue;
fL-$wK<p< if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
]1[:fQF7/L SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
/z}b1m+ }
93,7yZ5# }
Jt}#,I,B }
I;UT;/E2 return CallNextHookEx( hHook, nCode, wParam, lParam );
(bB"6
#TI }
9pWSvalw9 4#t-?5" BOOL InitHotkey()
rz%^l1@- {
F]0
qt$GO if(hHook!=NULL){
lO 0} nHookCount++;
r'o378]= return TRUE;
b9v<Jk }
R.
vVl+ else
N9rAosO* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
43O5|8o if(hHook!=NULL)
Zdfh*MHMg nHookCount++;
uaky2SgN return (hHook!=NULL);
>Ml5QO$*.q }
y3PrLBTz BOOL UnInit()
UG}2q:ST {
}-u%6KZ if(nHookCount>1){
&H+n0v nHookCount--;
H4sc7- return TRUE;
{lgiH+: }
U;!J(Us BOOL unhooked = UnhookWindowsHookEx(hHook);
7;&,LH if(unhooked==TRUE){
MpIiHKQ
G9 nHookCount=0;
K%Bz6 ~ hHook=NULL;
j5]ul!ji }
Hk(=_[S return unhooked;
Z aS29} }
/{W6]6^ ;BKU
_}k= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Z/|=@gpw {
BL"7_phM, BOOL bAdded=FALSE;
8.+
yZTg for(int index=0;index<MAX_KEY;index++){
;P/ 4.|< if(hCallWnd[index]==0){
DQaE9gmC hCallWnd[index]=hWnd;
KeXt"U HotKey[index]=cKey;
ZE~zs~z| HotKeyMask[index]=cMask;
:F@goiuC bAdded=TRUE;
UP%6s:>: KeyCount++;
Fmz+ Xb break;
~-B+7 }
;Me*#/ }
Q;A\M return bAdded;
gx?r8 }
=)gdxywoC e0otr_)3F BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
a6 0rJ#GD {
cUdS{K&K BOOL bRemoved=FALSE;
\<09.q<8 for(int index=0;index<MAX_KEY;index++){
CH;U_b if(hCallWnd[index]==hWnd){
BMu Efa^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=6"5kz10 hCallWnd[index]=NULL;
D}j`T HotKey[index]=0;
+oq<}CNr{ HotKeyMask[index]=0;
Z@f{f:Jc/" bRemoved=TRUE;
5b*knN> KeyCount--;
ws^Ne30 R break;
6)P.wW }
w`V6vYd@ }
Y0A(-" }
79exZ7| return bRemoved;
:zLf~W }
}2Euz.0 {uoF5|O6K void VerifyWindow()
q CYu@Ho {
|iUC\F=- for(int i=0;i<MAX_KEY;i++){
M*kE |q/K if(hCallWnd
!=NULL){ T,1qR:58
if(!IsWindow(hCallWnd)){ &ah%^Z4um
hCallWnd=NULL; wK#*|
HotKey=0; ,m5i(WL
HotKeyMask=0; FiUwy/,ZV
KeyCount--; {7z]+ h
} J:Qx5;b;
} t^FE]$,
} ( I#6!Yt9J
} zIjfxK
%oTBh* K'o
BOOL CHookApp::InitInstance() PQ[?zNrSV
{ jYRSV7d
AFX_MANAGE_STATE(AfxGetStaticModuleState()); \&;y:4&l8
hins=AfxGetInstanceHandle(); 1p$(\
InitHotkey(); (EY@{'.&
return CWinApp::InitInstance(); Hy&Z0W'l
} )Ak#1w&q
%\HPYnIe
int CHookApp::ExitInstance() _G/R;N71
{ [Tp?u8$p`
VerifyWindow(); pF-_yyQ
UnInit(); &l1t5 !
return CWinApp::ExitInstance(); xw
43P.
} aH'fAX0bF
LkS tU)
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0't)-Pj+,
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ocZ}RI#Q
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ XNJZ~Mowb
#if _MSC_VER > 1000 m[v0mXE
#pragma once [,AFtg[
#endif // _MSC_VER > 1000 _Fa\y ZX
yj4"eDg]
class CCaptureDlg : public CDialog D5P-$1KPt
{ ZY`9
// Construction jsE8=zZs
public: M*gvYo
BOOL bTray; `+n#CWZ"Y
BOOL bRegistered; ]?@ [Ny=0
BOOL RegisterHotkey(); mB_?N $K
UCHAR cKey; XKky-LeJ
UCHAR cMask; 63=&??4
void DeleteIcon(); }={@_g#
void AddIcon(); p7Wt(A
UINT nCount; t;w<n"
void SaveBmp(); HZRFE[ 9nb
CCaptureDlg(CWnd* pParent = NULL); // standard constructor +a.2\Qt2A
// Dialog Data =M;F&;\8
//{{AFX_DATA(CCaptureDlg) Tty'ysH
enum { IDD = IDD_CAPTURE_DIALOG }; {. 9BG&
CComboBox m_Key; ~O\A 0e
BOOL m_bControl; giNXXjl
BOOL m_bAlt; O^8ZnN_+
BOOL m_bShift; FJtmRPP[r
CString m_Path; '=E;^'Rl
CString m_Number; #Pg`0xiV
//}}AFX_DATA yHw @Z
// ClassWizard generated virtual function overrides v3Vve:}+
//{{AFX_VIRTUAL(CCaptureDlg) -fA =&$V
public: SzMh
virtual BOOL PreTranslateMessage(MSG* pMsg); hO8xH +;
protected: >va_,Y}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #G]IEO$M6
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !lNyoX/
//}}AFX_VIRTUAL qK.(wFx
// Implementation $~FZJ@qa
protected: hxL?6mhY
HICON m_hIcon; .?6p~
// Generated message map functions GO"|^W
//{{AFX_MSG(CCaptureDlg) "
7^nRJy
virtual BOOL OnInitDialog(); I+kAy;2
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c46-8z$
afx_msg void OnPaint(); 4u}Cki,vOK
afx_msg HCURSOR OnQueryDragIcon(); 8S8qj"s
virtual void OnCancel(); w~6UOA8}
afx_msg void OnAbout(); h-ii-c?R@0
afx_msg void OnBrowse(); sF!#*Y
afx_msg void OnChange(); D^@@ P
//}}AFX_MSG I^k&v V
DECLARE_MESSAGE_MAP() G"FO%3&|
}; zr?s5RS
#endif jyIIE7.I"
jOfG}:>e\
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file !rRBy3&
#include "stdafx.h" %.=}v7&<z
#include "Capture.h" {V>F69IU
#include "CaptureDlg.h" 6{.U7="
#include <windowsx.h> y5eEEG6
#pragma comment(lib,"hook.lib") htbE
Q NW
#ifdef _DEBUG UPGUJ>2Z
#define new DEBUG_NEW Kn$t_7AF^
#undef THIS_FILE 7_3
PM
3C
static char THIS_FILE[] = __FILE__; oMAUR
"
#endif -}4CY\d6'
#define IDM_SHELL WM_USER+1 }U=}5`_]D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xk!{UxQKQ
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TT9
\m=7
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [bKc5qp
class CAboutDlg : public CDialog v B~VJKD
{ o_=4Ex
"
public: 6K7lQ!#}Q
CAboutDlg(); A#']e 8
// Dialog Data AW\uE[kg
//{{AFX_DATA(CAboutDlg) +MHIZI
enum { IDD = IDD_ABOUTBOX }; Ar~<l2,{r
//}}AFX_DATA eu)""l
// ClassWizard generated virtual function overrides f
uU"
//{{AFX_VIRTUAL(CAboutDlg) s+_8U}R
protected: 3%Q<K=jy
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^GYVRD
//}}AFX_VIRTUAL Tt{X(I} J
// Implementation '`gnJX
JO
protected: lxZ9y
//{{AFX_MSG(CAboutDlg) *qL'WrB1
//}}AFX_MSG hFtjw6
DECLARE_MESSAGE_MAP() <#"_Qgdix
}; @6|0H`kv
3&E@#I^],
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F5H*z\/={
{ ~mvv
:u
//{{AFX_DATA_INIT(CAboutDlg)
)bYOy+2g
//}}AFX_DATA_INIT 3NZK$d=4
} F@ pf._c
|;aZi?Ek[
void CAboutDlg::DoDataExchange(CDataExchange* pDX) v5 p`=Z@%
{ dj9i*#F
CDialog::DoDataExchange(pDX); +3AX1o%p,#
//{{AFX_DATA_MAP(CAboutDlg) Hsov0
//}}AFX_DATA_MAP *'-C/
} m=COF$<
I5[@C<b
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ap"%%D^{:
//{{AFX_MSG_MAP(CAboutDlg) vd^Z^cpip
// No message handlers W:WRG8(F
//}}AFX_MSG_MAP WFFd3TN%<
END_MESSAGE_MAP() ]RadwH"0!
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (}T},ygQ
: CDialog(CCaptureDlg::IDD, pParent) 1S+T:n
{ S+eu3nMq
//{{AFX_DATA_INIT(CCaptureDlg) ,G?Kb#
m_bControl = FALSE; =SW <Vhtb
m_bAlt = FALSE; e8_EB/)_Z
m_bShift = FALSE; RZqMpW
m_Path = _T("c:\\"); Y)(w&E>1
m_Number = _T("0 picture captured."); 0[uOKFgE
nCount=0; >x~Qa@s;
bRegistered=FALSE; tK+JmbB\
bTray=FALSE; M0vX9;J
//}}AFX_DATA_INIT 2}.~
6EU/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +uNMyVH
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nD
4C $
} !iX/Ni:
*cXi*7|=
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) cV`NQt <W
{ PF)s>
CDialog::DoDataExchange(pDX); oj?y_0}:^
//{{AFX_DATA_MAP(CCaptureDlg) |hDN$By
DDX_Control(pDX, IDC_KEY, m_Key); W^;4t3eQf
DDX_Check(pDX, IDC_CONTROL, m_bControl); u
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DDX_Check(pDX, IDC_ALT, m_bAlt); 8{&.[SC7
DDX_Check(pDX, IDC_SHIFT, m_bShift); ]_!NmB_3
DDX_Text(pDX, IDC_PATH, m_Path); i_!$bk<yo
DDX_Text(pDX, IDC_NUMBER, m_Number); 4]
u\5K-
//}}AFX_DATA_MAP 7coVl$_Zl
} KNF{NFk
9RK.+2
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'w/S6j
//{{AFX_MSG_MAP(CCaptureDlg) -\Z`+k Y?p
ON_WM_SYSCOMMAND() AOqL&z
ON_WM_PAINT() rof9Rxxe-
ON_WM_QUERYDRAGICON() RO[X#c
ON_BN_CLICKED(ID_ABOUT, OnAbout) Efpju(
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #>z !ns
ON_BN_CLICKED(ID_CHANGE, OnChange) Smh=Q4,W
//}}AFX_MSG_MAP t`eIkq|NxI
END_MESSAGE_MAP() :;]O;RXt
s,|v,,<+
BOOL CCaptureDlg::OnInitDialog() u@Z6)r'
{ Cs vwc%
CDialog::OnInitDialog(); au+:-Khm
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,a0RI<D
ASSERT(IDM_ABOUTBOX < 0xF000); -<u_fv
CMenu* pSysMenu = GetSystemMenu(FALSE); j97K\]tQ
if (pSysMenu != NULL) u&f|z9
{ Ty;^3
CString strAboutMenu; szOa yAS
strAboutMenu.LoadString(IDS_ABOUTBOX); *~UK5Brf1
if (!strAboutMenu.IsEmpty()) 7PO]\X^(zE
{ kFfNDM#D
pSysMenu->AppendMenu(MF_SEPARATOR); 3CSwcD
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ZpwFC7LW
} vXak5iq>X
} Yqt~h
SetIcon(m_hIcon, TRUE); // Set big icon A`I1G9s
SetIcon(m_hIcon, FALSE); // Set small icon J!QIMA4{
m_Key.SetCurSel(0); MTbCL53!-
RegisterHotkey(); 6>b#nFVJ
CMenu* pMenu=GetSystemMenu(FALSE); JFkx=![
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); gU@R
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k/Q8:qA
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2H~E~6G
return TRUE; // return TRUE unless you set the focus to a control T!1XL7
} ndvt
$*
pT:6A[&
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h~=~csya:
{ 0/~{,
if ((nID & 0xFFF0) == IDM_ABOUTBOX) w:~vfdJ
{ v#5hK<9
CAboutDlg dlgAbout; DeQZDY //
dlgAbout.DoModal(); }AS3]Lub@
} _6aI>b#yL
else ?:7$c
{ IL%P\Zs
CDialog::OnSysCommand(nID, lParam); {C%f~j
} tR?)C=4,
} U6YQ*%mZ_
b,#?LdQ%
void CCaptureDlg::OnPaint() N1l^%Yf J
{ gjB(Pwx
if (IsIconic()) T^2o'_:
{ XU`vs`/
CPaintDC dc(this); // device context for painting 'lgS;ItpKu
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?+byRoY>&g
// Center icon in client rectangle C]krJse@
int cxIcon = GetSystemMetrics(SM_CXICON); $N4i)>&T2
int cyIcon = GetSystemMetrics(SM_CYICON);
&/)To
CRect rect; tG0
&0`
GetClientRect(&rect); 8y]{I^z}
int x = (rect.Width() - cxIcon + 1) / 2; f3mQd}<L
int y = (rect.Height() - cyIcon + 1) / 2; 2bOFH6g
// Draw the icon @:P:`Zk
dc.DrawIcon(x, y, m_hIcon); $A)[s$
} HQc^ybX5
else z[]8"C=
{ lh;;%@1DM
CDialog::OnPaint(); 2-rfFqpe
} cXt]55"
} 3Zm;:v4y
S"R(6:hkgu
HCURSOR CCaptureDlg::OnQueryDragIcon() O?Qi
{ a=*JyZ.2
return (HCURSOR) m_hIcon; -D
wO*f
} Ne}x(uRn
.s3y^1C
void CCaptureDlg::OnCancel() ?b?YiK&yz
{ %5<Xa
if(bTray) v@qVT'qlU
DeleteIcon(); F>aaUj
CDialog::OnCancel(); F?4&qbdD
} ynZfO2kf
(6i.>%|_
void CCaptureDlg::OnAbout() *YP;HL
{ <p#+('N`
CAboutDlg dlg; !InC8+be
dlg.DoModal(); y2>AbrJ
} Gg{M
F7JF1HfCP
void CCaptureDlg::OnBrowse() Pq3|O
Z
{ uVzvUz{b
CString str; ]=(PtzVa
BROWSEINFO bi; WdT iao,r
char name[MAX_PATH]; lT;uL~j
ZeroMemory(&bi,sizeof(BROWSEINFO)); 1"RC!
bi.hwndOwner=GetSafeHwnd(); \T^ptj(0
bi.pszDisplayName=name; v=E(U4v9e
bi.lpszTitle="Select folder"; RFLw)IWkL_
bi.ulFlags=BIF_RETURNONLYFSDIRS; g
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LPITEMIDLIST idl=SHBrowseForFolder(&bi); ulNMqz\.
if(idl==NULL) `4a9<bG
return; 9+I/bl4
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M[7$F&&n
str.ReleaseBuffer(); d,0Klew
m_Path=str; '_FxxLAO
if(str.GetAt(str.GetLength()-1)!='\\') 4ms"mIt
m_Path+="\\"; 3NN)ql
UpdateData(FALSE); HD>UTX`&mc
} WO[O0!X
jXYjs8Iy
void CCaptureDlg::SaveBmp() *fQn!2}=(
{ a[NR%Xq
CDC dc; |eP5iy wg
dc.CreateDC("DISPLAY",NULL,NULL,NULL); KDLrt
CBitmap bm; UYQ@ub
int Width=GetSystemMetrics(SM_CXSCREEN); vl|3WYA
int Height=GetSystemMetrics(SM_CYSCREEN); <5CQ#^cK
bm.CreateCompatibleBitmap(&dc,Width,Height); @Eh(GZN
CDC tdc; S"87 <o
tdc.CreateCompatibleDC(&dc); |8x_Av0
CBitmap*pOld=tdc.SelectObject(&bm); 3O2vY1Y2
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >s,*=a
tdc.SelectObject(pOld); 9c1q:>|
BITMAP btm; /w2IL7}
bm.GetBitmap(&btm); NA/Sv"7om
DWORD size=btm.bmWidthBytes*btm.bmHeight; h^b=
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); k`6T% [D]
BITMAPINFOHEADER bih; l~wx8
,?G
bih.biBitCount=btm.bmBitsPixel; Y(ly0U}
bih.biClrImportant=0; dy;Ue5
bih.biClrUsed=0; Zi[@xG8dm
bih.biCompression=0; ?&ThMWl
bih.biHeight=btm.bmHeight; b40zYH`'{
bih.biPlanes=1; a -,!K
bih.biSize=sizeof(BITMAPINFOHEADER); &96I4su
bih.biSizeImage=size; >Qz#;HI
bih.biWidth=btm.bmWidth; .R;HH_
bih.biXPelsPerMeter=0; r}MXXn,f
bih.biYPelsPerMeter=0; 900#K
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J{Ei+@^/9
static int filecount=0; Zh]d&Xeq
CString name; wj9CL1Gx
name.Format("pict%04d.bmp",filecount++); mdR:XuRD"t
name=m_Path+name; wP- pFc
BITMAPFILEHEADER bfh; eyy{z;D8r
bfh.bfReserved1=bfh.bfReserved2=0; *r$Yv&c,
bfh.bfType=((WORD)('M'<< 8)|'B'); C2Fklp6
bfh.bfSize=54+size; u{yENZ^P
bfh.bfOffBits=54; MQY^#N
CFile bf; 2Otd
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ zm8m J2s
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !y] Y'j
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Xkv>@7ec
bf.WriteHuge(lpData,size);
l3g6y9;
bf.Close(); dN*<dz+4r
nCount++; WZO#(eO`
} =D[h0U
GlobalFreePtr(lpData); }= <!j5:
if(nCount==1) D[-Ct
m_Number.Format("%d picture captured.",nCount); [2\`Wh:%P
else :m$%D]WY
m_Number.Format("%d pictures captured.",nCount); gwqK`ww
UpdateData(FALSE); %ANPv =
} *E.
2R{
#&8Opo(
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) HdnSs0/
{ &0C!P=-p
if(pMsg -> message == WM_KEYDOWN) gRqz8UI
{ W@S9}+wl*
if(pMsg -> wParam == VK_ESCAPE) .A `:o
return TRUE; /gdo~
if(pMsg -> wParam == VK_RETURN) a0LX<}
return TRUE; (CV=0{]
} RI*%\~6t?
return CDialog::PreTranslateMessage(pMsg); 2mT+@G
} `fV$'u
P<(mH=K
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }N|/b"j9
{ (Z5#;rgem
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ H5%I?ZXw4
SaveBmp(); W2B=%`sC
return FALSE; e^an` </{
} R"=M5
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O^$Zz<
CMenu pop; syfR5wc
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); LYFvzw>M
CMenu*pMenu=pop.GetSubMenu(0); igL^k`&5^"
pMenu->SetDefaultItem(ID_EXITICON); U
Oo(7
CPoint pt;
p[GyQ2k)
GetCursorPos(&pt); ]z%9Q8q'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iau&k`b`
if(id==ID_EXITICON) 5`DH\VD.j
DeleteIcon(); b#U%aPH
else if(id==ID_EXIT) pp`U]Q5"gX
OnCancel(); y_&XF>k91
return FALSE; lTP02|eK
} Ei<:=6EX?8
LRESULT res= CDialog::WindowProc(message, wParam, lParam); mTgn}rXk
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [ub\DLl
AddIcon(); 4\3t5n
return res; Z#O3s:`
}
}+J@;:
:JIPF=]fc
void CCaptureDlg::AddIcon() ( -@>
{ (ce NVo&
NOTIFYICONDATA data; pAuwSn#i
data.cbSize=sizeof(NOTIFYICONDATA); 6f!mk:\T.
CString tip; 0Kk*~gR?
tip.LoadString(IDS_ICONTIP); +GS=zNw#
data.hIcon=GetIcon(0); O2dgdtm
data.hWnd=GetSafeHwnd(); (^9M9+L[i
strcpy(data.szTip,tip); WRyLpTr-
data.uCallbackMessage=IDM_SHELL; !y?hn$w0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B_2>Yt"
data.uID=98; $O8V!R*
Shell_NotifyIcon(NIM_ADD,&data); KOx#LGz
ShowWindow(SW_HIDE); a6E"
bTray=TRUE; '=.Uz3D'0
} +GU16+w~E
w"i Zn
void CCaptureDlg::DeleteIcon() l)s +"C#
{ ""^BW Re D
NOTIFYICONDATA data; QB,ad
data.cbSize=sizeof(NOTIFYICONDATA); %ko 8P
data.hWnd=GetSafeHwnd(); <1BK5%?
data.uID=98; P;LZ!I
Shell_NotifyIcon(NIM_DELETE,&data); CD[=z)<z{
ShowWindow(SW_SHOW); `&zobbwq
SetForegroundWindow(); J9.p8A^^2
ShowWindow(SW_SHOWNORMAL); {fv8S;|u
bTray=FALSE; Gx_e\fe-/
} {~g
ss8v4@C
void CCaptureDlg::OnChange() KB*=a
{ R7c)C8/~
RegisterHotkey(); N-YZ0/c
} )#~fS28j
[F[<2{FQF
BOOL CCaptureDlg::RegisterHotkey() !bQ
&n
{ rxp9B>~
UpdateData(); #@s~V<rW
UCHAR mask=0; C*e[CP@u
UCHAR key=0; < DZ76
if(m_bControl) hg'!
mask|=4; q.[[c
if(m_bAlt) $!!=fFX*y
mask|=2; )ZyuF(C&
if(m_bShift) C,vc
aC?
mask|=1; B2qq C-hw?
key=Key_Table[m_Key.GetCurSel()]; P\6T4s
if(bRegistered){ [Ms{J!^q
DeleteHotkey(GetSafeHwnd(),cKey,cMask); :wmf{c
bRegistered=FALSE; ^-*Tn
} U]EuDNkO{
cMask=mask; p<fgUVR
cKey=key; B5H&DqWzr
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); C{i;spc!bi
return bRegistered; D4 ]B>
} a;T[%'in
#33RhJu5,
四、小结 ^*ezj1
%R*vSRG/U
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。