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:
E!9(6G4
2oF1do; 一、实现方法
Ygbyia| [[#R ry 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:
l$&dTI<# Y3\EX #pragma data_seg("shareddata")
s&4&\Aq}x# HHOOK hHook =NULL; //钩子句柄
#`ZBA>FLaQ UINT nHookCount =0; //挂接的程序数目
T)I\?hqTB static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
2lCgUe)N static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
b/w5K2 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
zIA)se
Js static int KeyCount =0;
3L CT-rp static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
L)n_
Q #pragma data_seg()
| .gE9'"bv ``-pjD(t 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
\ iA'^69 jL7r1pu5 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
D#D55X^6* #P1U]@ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
MtVvi6T cKey,UCHAR cMask)
/^L<q {
=)s~t|@v BOOL bAdded=FALSE;
jqj4(J@%yr for(int index=0;index<MAX_KEY;index++){
Uc,J+j0F if(hCallWnd[index]==0){
v5 @9 hCallWnd[index]=hWnd;
wmA TV/ HotKey[index]=cKey;
jLA)Y
[h HotKeyMask[index]=cMask;
8(ot<3(D bAdded=TRUE;
6M
;lD5(> KeyCount++;
?t/G@ break;
`TYC]9 }
r8tW)"? }
4T TrHs return bAdded;
+c8t~2tuN }
^`[<%. //删除热键
(5;nA' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
sPMICIv| {
'5b0 K1$" BOOL bRemoved=FALSE;
EOZ 6F-': for(int index=0;index<MAX_KEY;index++){
2q(gWhcj if(hCallWnd[index]==hWnd){
44s 9\ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8`wKq6 hCallWnd[index]=NULL;
WD_{bd) HotKey[index]=0;
(<
>L fn HotKeyMask[index]=0;
+w7U7"
xQ bRemoved=TRUE;
|2=@8_am KeyCount--;
|@~_&g break;
)Ii`/I^ }
fk9q 3 }
-G~/ GO }
}d>Xh8:%) return bRemoved;
D@O5G d }
X`3_ yeQc gnkeJ}K /i dI- DLL中的钩子函数如下:
~BqC!v.)@E ($!uBF-b LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7n o6
{
$e2+O\.> BOOL bProcessed=FALSE;
d!46`b$rd if(HC_ACTION==nCode)
I o"3wL)2 {
d>NO}MR if((lParam&0xc0000000)==0xc0000000){// 有键松开
d&AO4^ switch(wParam)
^<Gxip {
A|4om=MO case VK_MENU:
3AglvGK7{ MaskBits&=~ALTBIT;
a~J!G:( break;
5}Id[%.x case VK_CONTROL:
8#HnV%|N MaskBits&=~CTRLBIT;
jo0XF] break;
LEOri=?RF case VK_SHIFT:
T*gG <8 MaskBits&=~SHIFTBIT;
%t$KVV break;
71>,tq default: //judge the key and send message
tSux5yV break;
]l C2YD} }
1Jdx#K for(int index=0;index<MAX_KEY;index++){
zRd.!Rv if(hCallWnd[index]==NULL)
R?;mu^B continue;
"G~!J\ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pKpB {
cWG%>.`5r SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
mQ<4(qd) bProcessed=TRUE;
.p.(
\5Fo }
O$;#GpR }
2@lGY_O!m }
|5%T) else if((lParam&0xc000ffff)==1){ //有键按下
by0K:*C switch(wParam)
x`FTy&g {
+ kT ]qH case VK_MENU:
pdR\Ne0P* MaskBits|=ALTBIT;
@87Y/_l break;
W!R0:- case VK_CONTROL:
:<bhQY MaskBits|=CTRLBIT;
|O6/p7+. break;
M)!"R [V case VK_SHIFT:
$./aKJ1B MaskBits|=SHIFTBIT;
9r+'DX?> break;
Ww60-d}}Q default: //judge the key and send message
(sQXfeMz break;
:*&c' }
`"[qb ?z for(int index=0;index<MAX_KEY;index++){
,`RX~ H=C if(hCallWnd[index]==NULL)
n?$c"} continue;
=Gu&0f if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
u8.Tu7~ {
.)$MZyo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
z/+{QBen8 bProcessed=TRUE;
zCQP9oK! }
T*SLM"x }
54Rp0otv }
|&{S ~^$ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
M49l2x=]9 for(int index=0;index<MAX_KEY;index++){
n42\ty9 if(hCallWnd[index]==NULL)
_tX=xAO9 continue;
Y2XxfZj if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~-6_-Y| SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Y%kOq`uT=n //lParam的意义可看MSDN中WM_KEYDOWN部分
?T_MP" }
g)^s+Y }
De^:9<{jc }
[520!JhZY return CallNextHookEx( hHook, nCode, wParam, lParam );
\eNB L[ }
~
z3J4s >W8"Ar 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:
1P[x.t# 8U(o@1PT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
[tof+0Y6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
H7.l)' ~G@YA8} 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:
/{`"X_.o &.?E[db"h LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
tm5)x^7 {
`*B0n>ol, if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
|u?VlRt {
1s@QsZ3 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
2/r8%Sq SaveBmp();
,3 /o7 ' return FALSE;
!CX WoM }
*!$Z5Im …… //其它处理及默认处理
a-E}3a }
-$o0P'Vx 7`;f<QNo iLZY6?_^ 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。
Ms,MXJtH dt:$:,"
最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
0y,w\'j 5 | , b 二、编程步骤
I/tMFg ap )B%9 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Uzzm2OS` s$>n U 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
qjhV/fsfb F/BR#J1 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;
'7el`Ff jw=PeT| 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;
GW;%~qH[, "}qs+ 5、 添加代码,编译运行程序。
aH{)|? eIalcBY 三、程序代码
/Yp#`}Ii lP`BKc, ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<C&|8@A0 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
O7VEyQqf5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
F""9O6u #if _MSC_VER > 1000
$~.YB\3 #pragma once
[z2UfHpt~ #endif // _MSC_VER > 1000
_C?Wk:Y@ #ifndef __AFXWIN_H__
i cTpx#|= #error include 'stdafx.h' before including this file for PCH
MXcW
&b #endif
x+Xd7N1 #include "resource.h" // main symbols
aqI"4v]~b class CHookApp : public CWinApp
uB.kkkGZ M {
k*fU:q1
public:
I_v}}h{ CHookApp();
&N/t%q // Overrides
?=M?v;8 // ClassWizard generated virtual function overrides
4)8VmCW //{{AFX_VIRTUAL(CHookApp)
i^%$ydg public:
(^
EuF] virtual BOOL InitInstance();
I*
C~w virtual int ExitInstance();
rMx Iujx //}}AFX_VIRTUAL
nPXP9wmh4x //{{AFX_MSG(CHookApp)
A,DBq9Z+4R // NOTE - the ClassWizard will add and remove member functions here.
D1xGUz2r // DO NOT EDIT what you see in these blocks of generated code !
]qv0Y~+`-K //}}AFX_MSG
Yu3S3aRE DECLARE_MESSAGE_MAP()
H"l4b4)N\ };
rvd$4l^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
WqNXE)' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%|(c?`2| BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
WsV"`ij# BOOL InitHotkey();
tn'Jkwp BOOL UnInit();
,<tJ`,0X #endif
6I@j$edZ k(dakFaC^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
BM,hcTr? #include "stdafx.h"
v{a%TA9- #include "hook.h"
Q!1 ;xw~ #include <windowsx.h>
WZNq!K H #ifdef _DEBUG
f+ceL'fr #define new DEBUG_NEW
8-nf4=ll #undef THIS_FILE
~%/Rc` static char THIS_FILE[] = __FILE__;
oM~y8O #endif
jn V=giBu #define MAX_KEY 100
w7U]-MW6A* #define CTRLBIT 0x04
3 2\.-v #define ALTBIT 0x02
aP #define SHIFTBIT 0x01
]WDmx$"&e #pragma data_seg("shareddata")
^b+>r HHOOK hHook =NULL;
RtMI[ UINT nHookCount =0;
v<!S_7h static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
kKSGC?d static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
xGwImF$r static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
BUBx}dbCM static int KeyCount =0;
eTS}- static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
$5&%X'jk #pragma data_seg()
{\[ Gl HINSTANCE hins;
\tI%[g1M void VerifyWindow();
13!@LbC BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}UW7py!TN //{{AFX_MSG_MAP(CHookApp)
c}o 6Rm50 // NOTE - the ClassWizard will add and remove mapping macros here.
"17)`Yf // DO NOT EDIT what you see in these blocks of generated code!
pD$4nH4KST //}}AFX_MSG_MAP
Iy9hBAg\y END_MESSAGE_MAP()
|q77 J;0;oXwJ< CHookApp::CHookApp()
~ 1h#
{
:*''ci // TODO: add construction code here,
(G"'Fb6d // Place all significant initialization in InitInstance
:x\[aG9 }
K.)!qkW-%S >S +} CHookApp theApp;
^ F]hW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
.*zS2z {
!uEEuD# BOOL bProcessed=FALSE;
BY6#dlDi if(HC_ACTION==nCode)
o{s2T)2 {
lnZ{Ryo( if((lParam&0xc0000000)==0xc0000000){// Key up
5.~Je6K U switch(wParam)
'8X>,un {
S 5S\zTPIf case VK_MENU:
6ZQ |L=Ytp MaskBits&=~ALTBIT;
v03cQw\"WE break;
6$k#B ~~ case VK_CONTROL:
X1|
+9 MaskBits&=~CTRLBIT;
7=6:ZSI break;
At(88(y-W case VK_SHIFT:
)5Khl"6!z MaskBits&=~SHIFTBIT;
K&L!O3#( break;
_
>OP default: //judge the key and send message
ANhtz1Fl break;
XQ]K,# i }
Yr9'2.%Q for(int index=0;index<MAX_KEY;index++){
y*i&p4Y* if(hCallWnd[index]==NULL)
2zBk#c+ continue;
J6Z[c*W if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2Xt4Rqk $ {
@k?vbq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
QHk\Z bProcessed=TRUE;
Dl;hOHvKk }
?,vLRq. }
JmI%7bH@ }
7Q .Su else if((lParam&0xc000ffff)==1){ //Key down
\zO.#H switch(wParam)
*d1BpR% {
kt6x"'"1 case VK_MENU:
rQjk
MaskBits|=ALTBIT;
]at$ohS break;
(g##wa)L case VK_CONTROL:
a1cX+{W MaskBits|=CTRLBIT;
O*xx63%jR break;
7> Z| K case VK_SHIFT:
')uYI;h9 MaskBits|=SHIFTBIT;
&`D$w?beg break;
U zy@\ default: //judge the key and send message
Cy~ IB [ break;
|p|Zv H }
Ds`e-X)O;\ for(int index=0;index<MAX_KEY;index++)
2@|`Ugjptl {
-/Q5?0z if(hCallWnd[index]==NULL)
HXLnjXoe continue;
6>vR5pn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FOTe,F.8 {
C(N'=-;Kl SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%rW}x[M%w? bProcessed=TRUE;
my'nDi }
"<CM'R }
}.&nEi` }
;2f=d_/x if(!bProcessed){
n1-p/a. for(int index=0;index<MAX_KEY;index++){
2f,8Jnia if(hCallWnd[index]==NULL)
='7m$,{(Q[ continue;
]*2),H1
c if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
c#OxI*,+/ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
? x%s
j }
b;i*}4h! }
h3MdQlJ& }
:@L7RZ`_ return CallNextHookEx( hHook, nCode, wParam, lParam );
72<9xNcB!} }
x5lVb$!G xIM,0xM2 BOOL InitHotkey()
3q]0gU&?? {
VE\L&d2S if(hHook!=NULL){
m eF7[>!U nHookCount++;
eD>b|U=/ return TRUE;
+b|F_ }
k6tCfq; else
PQHztS" hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-)V0D,r$[ if(hHook!=NULL)
BZeEZ2" nHookCount++;
pzF_g-B return (hHook!=NULL);
T\6Qr$t }
X`8<;l BOOL UnInit()
A(y6]E! {
1-kuK<KR if(nHookCount>1){
V3,C5KKk&z nHookCount--;
9jal D
X return TRUE;
`G\
qGllX }
N*IroT3 BOOL unhooked = UnhookWindowsHookEx(hHook);
ti5fsc if(unhooked==TRUE){
aBAoSn nHookCount=0;
%'2P4( hHook=NULL;
P;5)Net1X }
t[|oSF#i return unhooked;
NLsF6BX/- }
wT@Z|.) iq;\}, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
579Q&|L. {
e,(Vy BOOL bAdded=FALSE;
<a R for(int index=0;index<MAX_KEY;index++){
;}B=g/C if(hCallWnd[index]==0){
m$8siF{<q hCallWnd[index]=hWnd;
#qd!_oN HotKey[index]=cKey;
>tg)F|@ HotKeyMask[index]=cMask;
Ws2q/[\oz bAdded=TRUE;
(Jq m9 KeyCount++;
5_^d3LOT0x break;
i\xs!QU }
hb[ThQ }
?$pNd uE return bAdded;
@nH3nn }
w-).HPe jFQ y[k-B BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
!'$*Z( {
frcAXh9 BOOL bRemoved=FALSE;
bJ2-lU% ;2 for(int index=0;index<MAX_KEY;index++){
]OpGD5jZ if(hCallWnd[index]==hWnd){
6~dAK3v5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
O"\4[HE^ hCallWnd[index]=NULL;
?q!4 REM HotKey[index]=0;
\`k=9{R. HotKeyMask[index]=0;
qnP4wRpr bRemoved=TRUE;
$QiMA, KeyCount--;
p{E(RsA break;
U6JD^G=qR, }
w,1N ;R& }
9SC1A -nF }
d V%o:@Z return bRemoved;
(?Ku-k }
/JNG}* -x?Z2EA! void VerifyWindow()
$1=7^v[U {
JuJW]E Q for(int i=0;i<MAX_KEY;i++){
Uw4iWcC if(hCallWnd
!=NULL){ BA
a:!p
if(!IsWindow(hCallWnd)){ ,ei9 ?9J1
hCallWnd=NULL; Sct
HotKey=0; WsTIdr36x
HotKeyMask=0; O_ #++G
KeyCount--; v&:[?<6-
} 'DW|a
} g}~s"Sz
} (j>`+F5f
} ET[5`z
SU%O \4Ty
BOOL CHookApp::InitInstance() .{gDw
{ m{>1#1;$t
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z|K HF"
hins=AfxGetInstanceHandle(); |QS|\8g{0V
InitHotkey(); GW
{tZaB
return CWinApp::InitInstance(); CC^D4]ug
} _J C*4
s(_z1
int CHookApp::ExitInstance() ?g1eW q&
{ t__f=QB/
VerifyWindow(); sm##owI
UnInit();
qiOtbH=
return CWinApp::ExitInstance();
Y*xgY*K
} ,DEq"VW_
.BxI~d^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file U<Oc&S{]*
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Vg62HZ |
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zd_N' :6
#if _MSC_VER > 1000 Ry[7PLn]
#pragma once J@_M%eN
#endif // _MSC_VER > 1000 Qi\]='C
g_4%M0&AX
class CCaptureDlg : public CDialog #~Xj=M%
{ Gd!_9S`68
// Construction 3MX#}_7A
public: )EMlGM'2q
BOOL bTray; uP4yJ/]
BOOL bRegistered; /'oo;e
BOOL RegisterHotkey(); .XpuD,^;@
UCHAR cKey; f)vnm*&-
UCHAR cMask; sssw(F
void DeleteIcon(); .LAB8bg
void AddIcon(); )4fQ~)
UINT nCount; ,'C*?mms
void SaveBmp(); T=NLBJ
CCaptureDlg(CWnd* pParent = NULL); // standard constructor p` ~=v4;b
// Dialog Data \<I&utn
//{{AFX_DATA(CCaptureDlg) w[a(I}x
enum { IDD = IDD_CAPTURE_DIALOG }; i^WY/ OhL
CComboBox m_Key; ~!ei]UP
BOOL m_bControl; v$\<L|
BOOL m_bAlt; JCxQENsVqB
BOOL m_bShift; ['>ZC3?"h
CString m_Path; v2gk1a&
CString m_Number; (Jb#'(~a
//}}AFX_DATA +Zi+
/9Z(H
// ClassWizard generated virtual function overrides )Q9Qo)D T
//{{AFX_VIRTUAL(CCaptureDlg) [1GwcXr
public: L'Iw9RAJ
virtual BOOL PreTranslateMessage(MSG* pMsg); @|h9jx|
protected: RKrNmD*rk*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zWPX
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); DhxS@/
//}}AFX_VIRTUAL `JV(ae0
// Implementation BN(=LQ2["
protected: 1z|bQ,5
HICON m_hIcon; xA^E+f:W_
// Generated message map functions d&G]k!|\
//{{AFX_MSG(CCaptureDlg) \ v+>qY<q
virtual BOOL OnInitDialog(); T!?tyW
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); XR VZU~ZV
afx_msg void OnPaint(); ?(zCv9Pg
afx_msg HCURSOR OnQueryDragIcon(); AP z"k?D0
virtual void OnCancel(); tvno3"
afx_msg void OnAbout(); 3AENY@*
afx_msg void OnBrowse(); )cL(()N
afx_msg void OnChange(); ).HA#!SE
//}}AFX_MSG qu#xc0?
DECLARE_MESSAGE_MAP() d<Lc&wlP
}; f5M;q;
#endif YXTV$A+lW
+<$nZ=,hsy
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file S/*\j7cj
#include "stdafx.h" @gqZiFM)
#include "Capture.h" W4.w
#include "CaptureDlg.h" NsS;d^%I
#include <windowsx.h> h}nS&.
#pragma comment(lib,"hook.lib") rYV]<[?~7
#ifdef _DEBUG ?=)lbSu
K
#define new DEBUG_NEW Y8%l)g
#undef THIS_FILE $XcH.z
static char THIS_FILE[] = __FILE__; AJ}m2EH
#endif BT}l"
#define IDM_SHELL WM_USER+1 a
Z)1S X`D
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CN` ~DD{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 22ySMtxn
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PI$i_3N
class CAboutDlg : public CDialog yX*$PNL5w
{ #c'B2Jn
public: }; 7I
CAboutDlg(); '>"blfix8
// Dialog Data )sQ/$gJ
//{{AFX_DATA(CAboutDlg) RIUJX{?
enum { IDD = IDD_ABOUTBOX }; NKEmY-f;
//}}AFX_DATA GL>YJ%
// ClassWizard generated virtual function overrides Yx,E5}-
//{{AFX_VIRTUAL(CAboutDlg) atd;)o0*0
protected: ,j{tGj_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EF$ASNh"
//}}AFX_VIRTUAL Q3hSWXq'
// Implementation 5|jY
protected: ab9ec Z
//{{AFX_MSG(CAboutDlg) }oiNgs/N
//}}AFX_MSG e*`ht+
DECLARE_MESSAGE_MAP() gREk,4DAv
};
s5G`?/
}^Sk.:;n3
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *@^@7`W
{ K:XP;#OsP
//{{AFX_DATA_INIT(CAboutDlg) E_'H=QN c
//}}AFX_DATA_INIT V=fh;p
} AB3OG*C9
8kcMgCO
void CAboutDlg::DoDataExchange(CDataExchange* pDX) WZHw(BN{+
{ 8JQ\eF$ma
CDialog::DoDataExchange(pDX); B1FJAKI);
//{{AFX_DATA_MAP(CAboutDlg) C6F7,v62
//}}AFX_DATA_MAP :J@3:+sr
} `#W+pO
IYtiX
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [\eVX`it
//{{AFX_MSG_MAP(CAboutDlg) mA.,.<xE@
// No message handlers 6~jAh@-
//}}AFX_MSG_MAP 1_!?wMo:f
END_MESSAGE_MAP() #Vmf
6
V'RbTFb9Z
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m rsmul{
: CDialog(CCaptureDlg::IDD, pParent) }pf|GdL
{ +w.$"dF!
//{{AFX_DATA_INIT(CCaptureDlg) XUVj<U
m_bControl = FALSE; | @ ut/
m_bAlt = FALSE; N<b2xT
m_bShift = FALSE; IUEpE9_
m_Path = _T("c:\\"); C+M]"{Y+
m_Number = _T("0 picture captured."); zx$1.IM"4
nCount=0; du~V=%9
bRegistered=FALSE; h*40jZ
bTray=FALSE; 4sORp^t'Q
//}}AFX_DATA_INIT rp"5176
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Id`V`|q
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Nr]Fh
} Sx
J0Y8#z
HnjA78%i
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \1<|X].jNY
{ !"yr;t>|Zb
CDialog::DoDataExchange(pDX); 7T6Zlp
//{{AFX_DATA_MAP(CCaptureDlg) 5y
g`TW
DDX_Control(pDX, IDC_KEY, m_Key);
$v#`2S(7
DDX_Check(pDX, IDC_CONTROL, m_bControl); aaKf4}
DDX_Check(pDX, IDC_ALT, m_bAlt); A/:_uqm4
DDX_Check(pDX, IDC_SHIFT, m_bShift); QnP3U
DDX_Text(pDX, IDC_PATH, m_Path); ^Lc\{,m
DDX_Text(pDX, IDC_NUMBER, m_Number); }@t"B9D
//}}AFX_DATA_MAP VoUo!t:(+
} k]$oir
P%Vq#5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) a:l-cZ/!
//{{AFX_MSG_MAP(CCaptureDlg) YU8]W%
ON_WM_SYSCOMMAND() \X\f~CB
ON_WM_PAINT() |
?vm.zp
ON_WM_QUERYDRAGICON() eC%Skw
ON_BN_CLICKED(ID_ABOUT, OnAbout) Cy/VH"G=
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Djc-f
ON_BN_CLICKED(ID_CHANGE, OnChange) vK+reXE
//}}AFX_MSG_MAP A-uIZ
zC
END_MESSAGE_MAP() 6|B9kh}
1,)
yEeHjU
BOOL CCaptureDlg::OnInitDialog() 8TAJ#Lm
{ ^<-r57pz
CDialog::OnInitDialog(); @q>Hl`a
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M!i|,S
ASSERT(IDM_ABOUTBOX < 0xF000); \5! 7zPc
CMenu* pSysMenu = GetSystemMenu(FALSE); NZ i3U
if (pSysMenu != NULL) g<;::'6
{ "OwVCym?
CString strAboutMenu; a,S;JF)v
strAboutMenu.LoadString(IDS_ABOUTBOX); <>{m+=gA
if (!strAboutMenu.IsEmpty()) MYjc6@=cR
{ (?t}S.>g
pSysMenu->AppendMenu(MF_SEPARATOR); +e2:?d@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 4P1}XYD-2
} ej}S{/<*n
} 2yg6hR
SetIcon(m_hIcon, TRUE); // Set big icon j:'g*IxM_
SetIcon(m_hIcon, FALSE); // Set small icon M+VWAh#uD
m_Key.SetCurSel(0); _9 '_w&
RegisterHotkey(); 3BCD0
%8
CMenu* pMenu=GetSystemMenu(FALSE); pk.\IKlG]
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^5Lk}<utw
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 51y"#\7
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <nqv)g"u0
return TRUE; // return TRUE unless you set the focus to a control mrnPZf i
} 1F5KDWtE
[H<TcT8
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4L8hn4F
{ R^/SBrWve
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0stc$~~v
{
HrsG^x
CAboutDlg dlgAbout; Ws`ndR
dlgAbout.DoModal(); /qIl)+M
} rq8 d}wj
else lcm[l
{ Z#H<+S(
CDialog::OnSysCommand(nID, lParam); [F-GaaM
} ;TWLo_
} 3rKJ<(-2/
v
'+]T=
void CCaptureDlg::OnPaint() %2zmc%]r
{ gHstdp_3
if (IsIconic()) &LAXNk2
{ =8?Kn@nMN
CPaintDC dc(this); // device context for painting zX&SnT1~
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?BfE*I$\h
// Center icon in client rectangle }H\I[5*
int cxIcon = GetSystemMetrics(SM_CXICON); 1\&j)3mC
int cyIcon = GetSystemMetrics(SM_CYICON); X@DW1<wEt
CRect rect; 2,q*[Kh1
GetClientRect(&rect); 9ET1Er{4
int x = (rect.Width() - cxIcon + 1) / 2; 0(eaVi-%D
int y = (rect.Height() - cyIcon + 1) / 2; vsj4?0=
// Draw the icon ^r&)@R$V
dc.DrawIcon(x, y, m_hIcon); 7:<w)Al!
} [TFJb+N&
else X^ Is-[OvE
{ Q&I`uS=F
CDialog::OnPaint(); `nl n@ ;
} TMj;NSc3
} tWIJ,_8l
gk%@& TB/
HCURSOR CCaptureDlg::OnQueryDragIcon() n^T,R
{ b[<RcM{r}
return (HCURSOR) m_hIcon; ~.%HZzR6&
} <ErX<(0`ig
)|lxzlk
void CCaptureDlg::OnCancel() pqfX}x
{ R^*baiXVI
if(bTray)
zd=O;T;.
DeleteIcon(); ?qaWt/m
CDialog::OnCancel(); >SK:b/i
} (6S'wb
L\PmT
void CCaptureDlg::OnAbout() c lB K
{ ccHf+=
CAboutDlg dlg; s;Gd`-S>d
dlg.DoModal(); AzOs/q8O
} ;v:(
P"Al*{:J
void CCaptureDlg::OnBrowse() q#W|fkfx+
{ h= sNj
CString str; 5 aA*
~\
BROWSEINFO bi; hGz_F/
char name[MAX_PATH]; Kp`{-dUf
ZeroMemory(&bi,sizeof(BROWSEINFO)); 5.9<g>C
bi.hwndOwner=GetSafeHwnd(); XVN`J]XHk
bi.pszDisplayName=name; =:^aBN#
bi.lpszTitle="Select folder"; gA!@oiq@
bi.ulFlags=BIF_RETURNONLYFSDIRS; "=djo+y
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5G f@n/M"
if(idl==NULL) T+<.KvO-
return; -!j6&
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q<dG}aj
str.ReleaseBuffer(); *5%vU|9b
m_Path=str; R c+olJ^5
if(str.GetAt(str.GetLength()-1)!='\\') T-en|.
m_Path+="\\"; ^viabkf C
UpdateData(FALSE); _p-e)J$7
} &J>e;X
Q 7_5
void CCaptureDlg::SaveBmp() 4o*i(W
{ ?*fY$93O
CDC dc; vk92j?
dc.CreateDC("DISPLAY",NULL,NULL,NULL);
QrYF Lh
CBitmap bm; <q'l7S
int Width=GetSystemMetrics(SM_CXSCREEN); {%R^8
int Height=GetSystemMetrics(SM_CYSCREEN); *q=T1JY
bm.CreateCompatibleBitmap(&dc,Width,Height); _=GjJ~2n
CDC tdc; $4nAb^/
tdc.CreateCompatibleDC(&dc); : {p'U2
CBitmap*pOld=tdc.SelectObject(&bm); =nhY;pY3u
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [7Lr"
tdc.SelectObject(pOld); dHc\M|HCC
BITMAP btm; +OE!Uqnt
bm.GetBitmap(&btm); 94"+l@K
DWORD size=btm.bmWidthBytes*btm.bmHeight; .AfZ5s]/F
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cFUD$mp
BITMAPINFOHEADER bih; &lQ%;)'
bih.biBitCount=btm.bmBitsPixel; 'ToE Y3
bih.biClrImportant=0; y [8;mCh
bih.biClrUsed=0; D'g,<-ahl
bih.biCompression=0; J}#gTG( '
bih.biHeight=btm.bmHeight; ?=? _32O
bih.biPlanes=1; $DL}jH^S
bih.biSize=sizeof(BITMAPINFOHEADER); q[&Kr+)j
bih.biSizeImage=size; _K^Q]V[nZ
bih.biWidth=btm.bmWidth; 0bTj/0G?
bih.biXPelsPerMeter=0; s1:Wrz?4
bih.biYPelsPerMeter=0; $UR:j8C{p$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^_WR) F'K
static int filecount=0;
LR97FG
CString name; e4S@ J/D
name.Format("pict%04d.bmp",filecount++); @Rr=uf G
name=m_Path+name; 0:$}~T9T
BITMAPFILEHEADER bfh; uJw?5kEbv<
bfh.bfReserved1=bfh.bfReserved2=0; 3UZd_?JI[^
bfh.bfType=((WORD)('M'<< 8)|'B'); x-BU$bx5
bfh.bfSize=54+size; I/O3OD
bfh.bfOffBits=54; M/N8bIC! Q
CFile bf; vO}r(kNJ
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bA^uzE
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _~<sb,W
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); e"E8BU
bf.WriteHuge(lpData,size); $.PRav
bf.Close(); A)f-r
nCount++; ,
>LJpv
} dli(ckr
GlobalFreePtr(lpData); (` *BZ_
if(nCount==1) 1'~Xn
4
f
m_Number.Format("%d picture captured.",nCount); n1sYD6u<&
else pbH!u+DF
m_Number.Format("%d pictures captured.",nCount); jIol`WX
UpdateData(FALSE); Cj-s
} 7Ak<e tHD
(RddR{mX
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) lvW
T
{ ?doI6N0T
if(pMsg -> message == WM_KEYDOWN) I!lDKS,b
{ Cv**iW
if(pMsg -> wParam == VK_ESCAPE) )~
(*q
return TRUE; _@DOH2lXJ
if(pMsg -> wParam == VK_RETURN) B=|R?t (*
return TRUE; w*F[[*j@.
} Qg4D*r\|@
return CDialog::PreTranslateMessage(pMsg); -D`1z?zHra
} qSY\a\.<
4V@%Y,:ee
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q:A#4Z
{ nLN0zfhE#
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ HpnF,4A>
SaveBmp(); )w7vE\n3
return FALSE; 3~>-A=
} @j!,8JQEd
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ n7[nl43
CMenu pop; b>ai"!
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4agW<c#
CMenu*pMenu=pop.GetSubMenu(0); dY8 H2;
pMenu->SetDefaultItem(ID_EXITICON); I,-n[k\J
CPoint pt; [l}H:%O,
GetCursorPos(&pt); Hjm> I'9
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c]6b|mHT
if(id==ID_EXITICON) 6S`_L
DeleteIcon(); \<7Bx[/D4
else if(id==ID_EXIT) /Hr|u
OnCancel(); B2;P%B
return FALSE; uo"<}>iJ
} 1&w%TRC2x
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y;b#qUd5a
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ?;XO1cs
AddIcon(); Rl?1|$%
return res; .9J^\%JD
} y``\^F
JRl=j2z
void CCaptureDlg::AddIcon() H$`U]
=s|
{ \c_g9Iqa
NOTIFYICONDATA data; 7HPwlS
data.cbSize=sizeof(NOTIFYICONDATA); Nq8ON!<<
CString tip; (TZK~+]@sb
tip.LoadString(IDS_ICONTIP); "qmSwdM
data.hIcon=GetIcon(0); 4 &bmt
data.hWnd=GetSafeHwnd(); 7:4c\C0
strcpy(data.szTip,tip); m$vq%[/#
data.uCallbackMessage=IDM_SHELL; x-%O1frc
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; MBWoPK
data.uID=98; TU|#Pz7n-Z
Shell_NotifyIcon(NIM_ADD,&data); Kb; *"@LX
ShowWindow(SW_HIDE); WtOjPW
bTray=TRUE; g}_2T\$k
} %1?t)Bg
Z(MZbzY7Hq
void CCaptureDlg::DeleteIcon() CFpBosoFt^
{ j.=:S;
NOTIFYICONDATA data; 9Yt|Wj
data.cbSize=sizeof(NOTIFYICONDATA); '2lV(>"
data.hWnd=GetSafeHwnd(); pDS[ecx
data.uID=98; 2yfU]`qN
Shell_NotifyIcon(NIM_DELETE,&data); lNX*s
E
.
ShowWindow(SW_SHOW); MJ}{Q1|*
SetForegroundWindow(); FLmD?nw
ShowWindow(SW_SHOWNORMAL); " MnWd BS
bTray=FALSE; }&0LoW/
} RY;V@\pRY+
,Fn;*
void CCaptureDlg::OnChange() [2@:jLth=
{ N9-0b
RegisterHotkey(); ![z2]L+TB
} R27'00(Z0
`l|Oj$
BOOL CCaptureDlg::RegisterHotkey() oCT,v 0+4O
{ e$9a9twl
UpdateData(); L^qCE-[
UCHAR mask=0; w%L4O;E]*{
UCHAR key=0; fI1CT)0<e
if(m_bControl) A7L; ims7
mask|=4; [4"(\r\f
if(m_bAlt) \uZpAV)5
mask|=2; $0V+<
if(m_bShift) xp|1yud
mask|=1; ^Mq/Cf_T
key=Key_Table[m_Key.GetCurSel()]; gC$_yd6m
L
if(bRegistered){ @qNY"c%HV
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3@~a)E}T
bRegistered=FALSE; ilL%
} bF _]j/
cMask=mask; ^Gk)aX
cKey=key; &eMd^l}:#
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); tl dK@!E3
return bRegistered; ,!Wo6{'
} %{
BV+&
h1~h&F?
四、小结 S)hDsf.I
aen%
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。