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:
p+#$S4V
N@Pf \D 一、实现方法
'*H&s \g&P5 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:
Hh`x>{,|S `7$0H]*6 #pragma data_seg("shareddata")
;zVtJG` HHOOK hHook =NULL; //钩子句柄
{#"[h1 UINT nHookCount =0; //挂接的程序数目
0.C[/ u[ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
dnt: U!TW@ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
hAq7v']m static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
fvnj:3RK static int KeyCount =0;
}tue`">h static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
e<o{3*%p) #pragma data_seg()
OhMnG@@ '&?cW#J? 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
wh8h1I
A (z
lX_ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
t@(S=i7}- 3>;zk#b2 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
x&>zD0\
:\ cKey,UCHAR cMask)
Q${0(#Nu {
sbn|D\p BOOL bAdded=FALSE;
\`3YE~7J/ for(int index=0;index<MAX_KEY;index++){
"cSH[/ if(hCallWnd[index]==0){
46`(u"RP hCallWnd[index]=hWnd;
;LEO+,6 HotKey[index]=cKey;
OSACH0h HotKeyMask[index]=cMask;
nP`#z&C bAdded=TRUE;
C3 >X1nU KeyCount++;
^y:!=nX^ break;
1t7 vP; }
d7
|3A }
i i&kfy return bAdded;
/J{
e_a }
z Ic%>?w //删除热键
j6x1JM BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/6)6 {
m/}(dT; BOOL bRemoved=FALSE;
g=W1y for(int index=0;index<MAX_KEY;index++){
$OEhdz&Fi if(hCallWnd[index]==hWnd){
Q'-g+aN if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
17IT:T,' hCallWnd[index]=NULL;
oAaUXkQE HotKey[index]=0;
2}:{}pw HotKeyMask[index]=0;
XIQfgrGZ bRemoved=TRUE;
n?uVq6c KeyCount--;
,m ^q> break;
'?7?"v }
J3/2>N]/} }
|VC|@ Q }
`s[77V> return bRemoved;
AcC'hr.N+ }
I!\;NVhv d@-s_gw g Mhn\ DLL中的钩子函数如下:
um.s:vj$ .CU~wB@h LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7O)j]eeoL {
[fVtQ@-S! BOOL bProcessed=FALSE;
E(t:F^z&D if(HC_ACTION==nCode)
MPSoRA: h {
n`'v8 `a] if((lParam&0xc0000000)==0xc0000000){// 有键松开
Py?EA*(d# switch(wParam)
VL6_in( {
lJZ-*"9V case VK_MENU:
7,vvL8\NHu MaskBits&=~ALTBIT;
~\4`tc break;
&U<t*" case VK_CONTROL:
#$/SM_X14C MaskBits&=~CTRLBIT;
P!uwhha/g break;
xOfZ9@VU case VK_SHIFT:
kFCjko MaskBits&=~SHIFTBIT;
H{&o_ break;
?[Gj?D.Wc default: //judge the key and send message
ruqx#]- break;
8&d s }
r7dvj#^ for(int index=0;index<MAX_KEY;index++){
<hG] f% if(hCallWnd[index]==NULL)
#L,>)Xk jS continue;
NR98I7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a3i;r M2 {
~Ey)9phZK SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
VE_% /Fs, bProcessed=TRUE;
"XvM1G&s` }
X0G
Mly }
fK-tvP0}* }
"v%|&@ else if((lParam&0xc000ffff)==1){ //有键按下
R
2.y=P8N switch(wParam)
^uG^XY&ItC {
Ed&;d+NM case VK_MENU:
k2]Q~ MaskBits|=ALTBIT;
3RYg-$NK[ break;
(WoKrd.! case VK_CONTROL:
z>n<+tso MaskBits|=CTRLBIT;
ZAKNyA2 break;
mn5mdrv3WZ case VK_SHIFT:
0W}iKT[Z MaskBits|=SHIFTBIT;
I,rs&m?/m break;
Vs/Z8t default: //judge the key and send message
M
mihWD02 break;
X{8/]'( }
a04I.5! for(int index=0;index<MAX_KEY;index++){
Z{'.fq2A if(hCallWnd[index]==NULL)
W.nQYH continue;
bKAR}JM& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
6x6xv:\ {
KDt@Xi6|| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6LVJ*sjSy bProcessed=TRUE;
'a&( r; }
=aL=SC+ }
A'jw;{8NpF }
kqyVUfX$3 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
)Fa6'M for(int index=0;index<MAX_KEY;index++){
]t4 9Efw if(hCallWnd[index]==NULL)
&DUt`Dr w continue;
0/r\#"+XT if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
7&I+mw/X SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RU r0K#] //lParam的意义可看MSDN中WM_KEYDOWN部分
y2XeD=_' }
|.8lS3C }
6Vq]AQx }
KN41kkN return CallNextHookEx( hHook, nCode, wParam, lParam );
aWtyY[= }
O-5s}RT ^N{Lau 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
qa|"kRCO 9lT6fW`v1Q BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
J}c`\4gD BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
k{{ iF ^:c:~F6J 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
fJjtrvNy) ow,4'f!d LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%cPz>PTW@ {
muD7+rn?& if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
pONBF3H8 {
E`^?2dv+/ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
WJB/X"J SaveBmp();
YLEk
M
return FALSE;
#7wOr78 }
#fF~6wopV …… //其它处理及默认处理
6f$h1$$)^ }
jjs1Vj1@< uude<d"U <%@S-+D`] 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!?t/% q;XO1Se 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。
z j[/~I !A5UT- 二、编程步骤
$U{\T4
]+ \]2`? 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";
5>o<!0g 2E@ ! 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
upD2vtU @R!f(\ 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;
,$lOQ7R1( dWg09 sx 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
#D{jNSB [CCj5N1/ 5、 添加代码,编译运行程序。
AqD)2O{VO ^t|CD|,K_O 三、程序代码
*2$I,
~(P 1|+Zmo" ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Pf?*bI #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
,gvv297 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ujo3"j[b #if _MSC_VER > 1000
l1Zf#]x #pragma once
(l|:$%[0 #endif // _MSC_VER > 1000
ywPFL/@ #ifndef __AFXWIN_H__
} s0?RH #error include 'stdafx.h' before including this file for PCH
v|VfSLZTb #endif
xB%Felz #include "resource.h" // main symbols
"zT#*>U class CHookApp : public CWinApp
~6:<OdQ {
K#O8P+n5[ public:
sQBl9E'!be CHookApp();
yAge2m]<B // Overrides
~|LlT^C // ClassWizard generated virtual function overrides
|_=o0lf //{{AFX_VIRTUAL(CHookApp)
hQm"K~SW= public:
(#4 virtual BOOL InitInstance();
ac/=%om8u virtual int ExitInstance();
;:w?&4 //}}AFX_VIRTUAL
(sngq{*%%z //{{AFX_MSG(CHookApp)
8z?q4 // NOTE - the ClassWizard will add and remove member functions here.
8veYs` // DO NOT EDIT what you see in these blocks of generated code !
oZ)\Ya= //}}AFX_MSG
XT n`$}nz DECLARE_MESSAGE_MAP()
v=(L>gg };
|{KZ< LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
,ZVC@P,L BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z}Qt6na]- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
i[gq8% BOOL InitHotkey();
fvW7a8k3 BOOL UnInit();
gtcU'4~ #endif
WVP^C71 gC}r$ZB( //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
oGK 1D #include "stdafx.h"
JN9
W:X. #include "hook.h"
7TTU&7l~ #include <windowsx.h>
pa7Iz^i #ifdef _DEBUG
;8Z\bHQ> #define new DEBUG_NEW
N8<Wm>GLX~ #undef THIS_FILE
)PM&x static char THIS_FILE[] = __FILE__;
qRD]Q #endif
sknta0^=2 #define MAX_KEY 100
5LT{]&`9 #define CTRLBIT 0x04
EF7Y 4lp #define ALTBIT 0x02
{=(GY@yU/ #define SHIFTBIT 0x01
p8%/T>hK #pragma data_seg("shareddata")
PMDx5-{A/t HHOOK hHook =NULL;
]F,mj-?4x UINT nHookCount =0;
!'4HUB>+ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
X[ERlw1q4Q static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
RhJ{#G~:% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
CS:"F) at static int KeyCount =0;
|@J:A! static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
c,$ >u,4 #pragma data_seg()
B( ]=I@L=W HINSTANCE hins;
RCFocOOn void VerifyWindow();
gAy,uP~, BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
K_@[% //{{AFX_MSG_MAP(CHookApp)
$6BD6\@ // NOTE - the ClassWizard will add and remove mapping macros here.
yu3T5@Ww // DO NOT EDIT what you see in these blocks of generated code!
Gw"H#9J}
T //}}AFX_MSG_MAP
,ux?wa+ END_MESSAGE_MAP()
rKlu+/G 4M)
s CHookApp::CHookApp()
{Z>OAR# {
X 8TwMt // TODO: add construction code here,
8 |2QJ // Place all significant initialization in InitInstance
";jj` }
\r_-gn'1b O-rHfIxY CHookApp theApp;
99'e)[\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
29]T:I1d[ {
H
/E.R[\+x BOOL bProcessed=FALSE;
"=7y6bM if(HC_ACTION==nCode)
xLfx/&2 {
k79"xyXX if((lParam&0xc0000000)==0xc0000000){// Key up
ogt<vng switch(wParam)
R %QgOz3` {
9{gY|2R_ case VK_MENU:
6}aIb .j MaskBits&=~ALTBIT;
kPN:m ow break;
CJ*8x7-t case VK_CONTROL:
Z J:h] MaskBits&=~CTRLBIT;
D49yV` break;
;a]2hd"6 case VK_SHIFT:
] m$;ra] MaskBits&=~SHIFTBIT;
beLT4~Z= break;
|1sl>X, default: //judge the key and send message
3"ALohlL break;
!/+'O}@-E }
+tbG^w% for(int index=0;index<MAX_KEY;index++){
_f9XY if(hCallWnd[index]==NULL)
ZK =`Y@ continue;
y.$/niQ% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
efj[7K.h {
ZzU3j ^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
d!+8 bProcessed=TRUE;
[P5+}@t }
o6JCy\Bx }
IMaa#8, }
0w'%10"&U+ else if((lParam&0xc000ffff)==1){ //Key down
3)jFv7LAU switch(wParam)
Te%2(w,B {
:'*;>P
.( case VK_MENU:
sdk%~RN0T MaskBits|=ALTBIT;
[TUy><Z break;
Hw 7 case VK_CONTROL:
),9^hJ1+@ MaskBits|=CTRLBIT;
L : hEt break;
?:D#\4=US case VK_SHIFT:
i:9f# MaskBits|=SHIFTBIT;
fi5x0El
break;
Z=VAjJ;i[ default: //judge the key and send message
Igowz7 break;
Z`L-UQJ. }
huj 6Ysr for(int index=0;index<MAX_KEY;index++)
9ihB;m'C) {
H_*;7/& if(hCallWnd[index]==NULL)
q*`1<9{H continue;
7(RtPLpZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`Sh#>
Jp {
ElJM.
a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~p9nAACU bProcessed=TRUE;
!q:[$g-@q }
zGtWyXP }
LxWnPi ^ }
$a^YJY^_ if(!bProcessed){
xcBV,[E{ for(int index=0;index<MAX_KEY;index++){
c&!EsMsU if(hCallWnd[index]==NULL)
J$'Q3k continue;
<m;idfn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
)tB:g.2k SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
V`F]L^m=L }
C%hMh/Li; }
:A+nmz!z }
^FaBaDcnl return CallNextHookEx( hHook, nCode, wParam, lParam );
6Fp}U }
A~MAaw!YE |y,%dFNLf BOOL InitHotkey()
>=G-^z: {
mB.ybrig if(hHook!=NULL){
X
rBe41 nHookCount++;
gP&G63^ return TRUE;
@FC|1=+ }
N3J T[7 else
uB;\nj5'D hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
z[zURj-*] if(hHook!=NULL)
*V@>E2@ nHookCount++;
]: VR3e"H return (hHook!=NULL);
mMp( }
A1VbqA BOOL UnInit()
y5" b(nb {
dD%Sbb if(nHookCount>1){
j2@19YXe@ nHookCount--;
/Y NV return TRUE;
r&$r=f< }
dvPK5+0W? BOOL unhooked = UnhookWindowsHookEx(hHook);
2n/cqK if(unhooked==TRUE){
3aD\J_ nHookCount=0;
0l.\KF hHook=NULL;
'/2u^&W }
^0 zWiX return unhooked;
,C4gA(')K }
|wef [|@% |f9fq~'1e BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
2P&KU%D)0s {
J |$(O$hYy BOOL bAdded=FALSE;
2[^p6s[ for(int index=0;index<MAX_KEY;index++){
:`Nh}Ka0 if(hCallWnd[index]==0){
3&39M& hCallWnd[index]=hWnd;
l1<]pdLTR HotKey[index]=cKey;
dm;C @.ML HotKeyMask[index]=cMask;
,{tz%\,% bAdded=TRUE;
;|C[.0;kgv KeyCount++;
Sbf+;:D break;
UEm~5,>$0 }
1rnbUE }
,CGq_>Z return bAdded;
\J]qd4tF }
} "QV{W m%?+;V BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`>kHJI4 {
4&)4hF BOOL bRemoved=FALSE;
hv]}b'M$ for(int index=0;index<MAX_KEY;index++){
orT%lHwjL if(hCallWnd[index]==hWnd){
wD*z >v$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
zO@7V>2 hCallWnd[index]=NULL;
.ty^ k@J|] HotKey[index]=0;
U};~ff+ HotKeyMask[index]=0;
"Uk " bRemoved=TRUE;
)/32sz]~ KeyCount--;
8y9`xRy break;
Cob<N'. }
#b^x! lR }
e!eUgD }
zB/)_AW
return bRemoved;
Sj,>O:p }
HU~,_m AK$h
SM void VerifyWindow()
~s$
jiA1 {
JPsR7f for(int i=0;i<MAX_KEY;i++){
ZUkrJ' if(hCallWnd
!=NULL){ PO$
OXw
if(!IsWindow(hCallWnd)){ )&jE<C0
hCallWnd=NULL; { \r1A
HotKey=0; 0=WZ 8|R
HotKeyMask=0; Q!%C:b
KeyCount--; I;=HXL
} 8 !{;yz
} 5.]eF$x2
} e9F\U
} |i/Iv
|I0O|Zdv
BOOL CHookApp::InitInstance() q? 9x0L
{ RV%aFI )
AFX_MANAGE_STATE(AfxGetStaticModuleState()); :!fP~(R'm
hins=AfxGetInstanceHandle(); 49e~/YY
InitHotkey(); _0razNk
return CWinApp::InitInstance(); o%~PWA*Qp
} Nt>wzPd)
sKIpL(_I$
int CHookApp::ExitInstance() 2r0u[
{ bD: yu
VerifyWindow(); 1@i 8ASL
UnInit(); ptA-rX.
return CWinApp::ExitInstance(); Ts~MkO
} s#nd:$p3
%T_4n^beFQ
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @u4q\G\
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \!]Zq#*kH
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4R;6u[a]u
#if _MSC_VER > 1000 ``Yw-|&:Ae
#pragma once ]>:LHW
#endif // _MSC_VER > 1000 Za5bx,^
~_;x o?@ba
class CCaptureDlg : public CDialog =P,h5J
{ ^")SU(`
// Construction bOY<C%;C
public: P
S$6`6G
BOOL bTray; p!XB\%sv'"
BOOL bRegistered; dxz.%a@PW
BOOL RegisterHotkey(); xlhc`wdm
UCHAR cKey; tB,1+I=
UCHAR cMask; dx<KZR$!V
void DeleteIcon(); ME9jN{ le
void AddIcon(); =}8:zO
2'{
UINT nCount; \Y?ByY
void SaveBmp(); G"xa"hGF
CCaptureDlg(CWnd* pParent = NULL); // standard constructor EYLqg`2A
// Dialog Data 6)@Y 41H]C
//{{AFX_DATA(CCaptureDlg) &+K:pU?[$
enum { IDD = IDD_CAPTURE_DIALOG }; ?6m6 4{M
CComboBox m_Key; -0tHc=\u(
BOOL m_bControl; b }^ylm
BOOL m_bAlt; *8a8Ng
BOOL m_bShift; H*h 7Y*([
CString m_Path; +OM9v3qJ
CString m_Number; 5LIbHSK
//}}AFX_DATA gM5`UH|
// ClassWizard generated virtual function overrides e1
yvvi
//{{AFX_VIRTUAL(CCaptureDlg) nw)yK%`;M
public: U}=o3u
virtual BOOL PreTranslateMessage(MSG* pMsg); M^e;WY@ D
protected: +H'{!:e5
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support EWr8=@iU
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); N'!:
//}}AFX_VIRTUAL 9"#,X36
// Implementation +O2z&a;q
protected: o'`:$
(
HICON m_hIcon; ipIexv1/S
// Generated message map functions 8}Qmhm`_j=
//{{AFX_MSG(CCaptureDlg) nWyn}+C-
virtual BOOL OnInitDialog(); ~.dmfA{
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 7e`ylnP!
afx_msg void OnPaint(); 8
<~E;:
afx_msg HCURSOR OnQueryDragIcon(); )-RI
virtual void OnCancel(); iaq+#k@ V
afx_msg void OnAbout(); |KC!6<}T~9
afx_msg void OnBrowse(); Pd~{XM,yfW
afx_msg void OnChange(); C
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//}}AFX_MSG S(c&XJR
DECLARE_MESSAGE_MAP() GJ3@".+6
}; pKxq\U
#endif )PU_'n=>
` !JcQ'u
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #cZ<[K q6
#include "stdafx.h" [5iBXOmpS=
#include "Capture.h" ;mi+[`E
#include "CaptureDlg.h" Oh|KbM*vS
#include <windowsx.h> =:5o"g
#pragma comment(lib,"hook.lib") Q`ALyp,9b
#ifdef _DEBUG p1O[QQ|
#define new DEBUG_NEW 7a<-}>sU
#undef THIS_FILE HqZ3]
static char THIS_FILE[] = __FILE__; q#mw#Uw-
#endif )[c@5zy~*
#define IDM_SHELL WM_USER+1 ^e1Ux
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w<0F-0:8
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Avc9W[4
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H/v|H}d;
class CAboutDlg : public CDialog Ha}TdQ%
{ 8d!t"oj68
public: da,Bnze0
CAboutDlg(); A:?|\r
// Dialog Data y9#r
SA*
//{{AFX_DATA(CAboutDlg) }3Mnq?.-
enum { IDD = IDD_ABOUTBOX }; j\uh]8N3<
//}}AFX_DATA S
6|#9C&
// ClassWizard generated virtual function overrides :d!qZFln
//{{AFX_VIRTUAL(CAboutDlg) y>5??q
protected: j&c YRKpz
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qoo+=eh!
//}}AFX_VIRTUAL ~h<<-c
// Implementation T=kR!Gx
protected: ?KKu1~a_
//{{AFX_MSG(CAboutDlg) dpTeF`N
//}}AFX_MSG d
hp-XIA;
DECLARE_MESSAGE_MAP() 9S y |:J0
}; (sfy14>\
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) WcG}9)9
{ XuY#EJbZ
//{{AFX_DATA_INIT(CAboutDlg) Ei
Yj `P
//}}AFX_DATA_INIT v"LH^!/
} n;F/}:c_a
;Sq n
w
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $$tFP"pZ
{ d<@SRHP(
CDialog::DoDataExchange(pDX); VsrYU@V
//{{AFX_DATA_MAP(CAboutDlg) l, [cR?v
//}}AFX_DATA_MAP K4{1}bU{>
} zIeJ[J@
w|AHE
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) FS1>
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//{{AFX_MSG_MAP(CAboutDlg) 3rUuRsXn
// No message handlers )qL UHE=
//}}AFX_MSG_MAP mk'$ |2O
END_MESSAGE_MAP() sb3k? q
y-/,,,r
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l0&Y",vy
: CDialog(CCaptureDlg::IDD, pParent) GlPd)m`
{ xX5EhVR
//{{AFX_DATA_INIT(CCaptureDlg) )v+R+3<
m_bControl = FALSE; DA(ur'D
m_bAlt = FALSE; / p PSo
m_bShift = FALSE; TJhzyJ"t
m_Path = _T("c:\\"); X;vfbF
m_Number = _T("0 picture captured."); ~:ldGfb|
nCount=0; *>#mI/#}
bRegistered=FALSE; 'Wv`^{y <^
bTray=FALSE; ;L{#TC(]J]
//}}AFX_DATA_INIT EW:tb-%`
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Wj}PtQ%lp/
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \uUd *
} Q~y) V
qIC9L"I
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) WC pCWtmy
{ L#}HeOEi[
CDialog::DoDataExchange(pDX); \@KK X
//{{AFX_DATA_MAP(CCaptureDlg) XP|qY1
DDX_Control(pDX, IDC_KEY, m_Key); H/I1 n\
DDX_Check(pDX, IDC_CONTROL, m_bControl); @|i
f^
DDX_Check(pDX, IDC_ALT, m_bAlt); 0YApaL+jt
DDX_Check(pDX, IDC_SHIFT, m_bShift); Ny6 daf3f
DDX_Text(pDX, IDC_PATH, m_Path); iem@K
DDX_Text(pDX, IDC_NUMBER, m_Number); 0]._|Ubn6)
//}}AFX_DATA_MAP 9eh9@~mU"l
} XeJ|Z)qZ
`-J$7)d@
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mx ]a@tu
//{{AFX_MSG_MAP(CCaptureDlg) jO9w7u6
ON_WM_SYSCOMMAND() ku&m)'
ON_WM_PAINT() 'cpO"d?{
ON_WM_QUERYDRAGICON() -<jd/ 5
ON_BN_CLICKED(ID_ABOUT, OnAbout) Tx|}ke~
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jlA?JB
ON_BN_CLICKED(ID_CHANGE, OnChange) yW!+:y_N_
//}}AFX_MSG_MAP ?L'4*S]
END_MESSAGE_MAP() V|njgcn d
iL ](w3EM
BOOL CCaptureDlg::OnInitDialog() #zL0P>P'a
{ N;6@f*3_i
CDialog::OnInitDialog(); /ad]pdF
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hHoc>S6^M
ASSERT(IDM_ABOUTBOX < 0xF000); +,H6)'#Z
CMenu* pSysMenu = GetSystemMenu(FALSE); OfAh?^R
if (pSysMenu != NULL) d ~`_;.z
{ ]JUb;B;Z
CString strAboutMenu; [/Figr]
strAboutMenu.LoadString(IDS_ABOUTBOX); DsI{*#
if (!strAboutMenu.IsEmpty()) M*xt9'Yd
{ pVGH)6P>|
pSysMenu->AppendMenu(MF_SEPARATOR); ER)<Twj
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Naqz":%.
} IdzrQP
} <.N337!
SetIcon(m_hIcon, TRUE); // Set big icon Y2B",v"
SetIcon(m_hIcon, FALSE); // Set small icon M
}H7`,@I
m_Key.SetCurSel(0); 2!y %nkO*
RegisterHotkey(); =D"H0w <zw
CMenu* pMenu=GetSystemMenu(FALSE); ':[:12y[
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $d +n},[C{
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ENEn Hu^
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pEn3:.l<
return TRUE; // return TRUE unless you set the focus to a control .0eHP
} cfg_xrW0^
+1]xmnts
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~nSGN%
{ !6 k{]v
if ((nID & 0xFFF0) == IDM_ABOUTBOX) uINm>$G,5
{ } XJZw|n
CAboutDlg dlgAbout; \i +=tGY
dlgAbout.DoModal(); MUs~ZF
} jcuC2t
else ~:|qdv%\
{ :q+D`s
CDialog::OnSysCommand(nID, lParam); S(b5Gj/Kd
} OGC|elSM
} (ru9Ke%Dx
u40k9vh
void CCaptureDlg::OnPaint() @NY$.K#]
{ qDPpGI-Y2e
if (IsIconic()) 2Y+8!4^L
a
{ N)0I+>, ^
CPaintDC dc(this); // device context for painting yU"'h[^
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~Xf&<&5d T
// Center icon in client rectangle HxgH*IMs
int cxIcon = GetSystemMetrics(SM_CXICON); Q.d Hg7+D
int cyIcon = GetSystemMetrics(SM_CYICON); n*
7mP
CRect rect; ?pLKUA h
GetClientRect(&rect); P!Mz5QZ+
int x = (rect.Width() - cxIcon + 1) / 2; G#~6a%VW
int y = (rect.Height() - cyIcon + 1) / 2; ic+tn9f\
// Draw the icon 1aAYBV<3
dc.DrawIcon(x, y, m_hIcon); ua'dm6",:
} dE_I=v
else DJF-J#
{ OcBn1k.
CDialog::OnPaint();
r$7D;>*O{
} c20'{kH
} ?b&~(,A{
,uFdhA(i@'
HCURSOR CCaptureDlg::OnQueryDragIcon() nvyyV\w
{ 2yFXX9!@
return (HCURSOR) m_hIcon; 4/rdr80
} n<x NE%
8+b ?/Rn0
void CCaptureDlg::OnCancel() >H,t^i}@
{ in^Rf`
"
if(bTray) x4HVB
DeleteIcon(); dB^')-wA
CDialog::OnCancel(); -ty_<m]
} cE*Gd^
54A ndyeA
void CCaptureDlg::OnAbout() "I|[m%\
{ u/D=&"tL
CAboutDlg dlg; d9hJEu!Lu
dlg.DoModal();
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} {FavF 9O
Tk'YpL#U
void CCaptureDlg::OnBrowse() "ct_EPr`
{ ?\7" A
CString str; Jk.Ec)w
BROWSEINFO bi; Cu%|}xq
char name[MAX_PATH]; [y>;[K
ZeroMemory(&bi,sizeof(BROWSEINFO)); tcg sXB/t
bi.hwndOwner=GetSafeHwnd(); }b#KV?xgW
bi.pszDisplayName=name; FuYV}C
bi.lpszTitle="Select folder"; R ks3L
bi.ulFlags=BIF_RETURNONLYFSDIRS; h4x RRyK
LPITEMIDLIST idl=SHBrowseForFolder(&bi); V0]6F
if(idl==NULL) Ef;OrE""
return; @Y#{[@Hp%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ypuW}H%`
str.ReleaseBuffer(); NA,)FmQjk
m_Path=str; kCRP?sj
if(str.GetAt(str.GetLength()-1)!='\\') j}=$2|}8{
m_Path+="\\"; Xegg2.Kk
UpdateData(FALSE); (+Yerc.NQt
} Jmln*,Ol7
h5bQ
void CCaptureDlg::SaveBmp() /^E2BRI
{ HDyus5g
CDC dc; K4vl#*qn
dc.CreateDC("DISPLAY",NULL,NULL,NULL); O; qerE?i`
CBitmap bm; X9f!F2x
int Width=GetSystemMetrics(SM_CXSCREEN); Q<y&*o3YF|
int Height=GetSystemMetrics(SM_CYSCREEN);
*Mt's[8
bm.CreateCompatibleBitmap(&dc,Width,Height); J`ia6fy.I
CDC tdc; /=x) 9J
tdc.CreateCompatibleDC(&dc); +3
2"vq)_
CBitmap*pOld=tdc.SelectObject(&bm); Og`6>?>97
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zL@ZNH
tdc.SelectObject(pOld); xQ
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BITMAP btm; t`
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bm.GetBitmap(&btm); /{.
DWORD size=btm.bmWidthBytes*btm.bmHeight; bP`.teO\
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <Gy)|qpK[
BITMAPINFOHEADER bih; 0R,?$qM\
bih.biBitCount=btm.bmBitsPixel; yIwAJl7Xf
bih.biClrImportant=0; 3|Q:tt'|#
bih.biClrUsed=0; "8Ud&o
bih.biCompression=0; Cwxy~.mI
bih.biHeight=btm.bmHeight; Y5~_y?BX
bih.biPlanes=1; nlsQf3
bih.biSize=sizeof(BITMAPINFOHEADER); '3f"#fF6
bih.biSizeImage=size; ,X&lVv#
bih.biWidth=btm.bmWidth; ?qviJDD|f
bih.biXPelsPerMeter=0; `e
t0i.
bih.biYPelsPerMeter=0; P9/5M4]tt
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /q4<ZS#
static int filecount=0; z?HP%g'M~
CString name; D>u1ngu
name.Format("pict%04d.bmp",filecount++); K .cMuh
name=m_Path+name; H|4O`I;~(
BITMAPFILEHEADER bfh; ]q0mo1-EZ!
bfh.bfReserved1=bfh.bfReserved2=0; 5FJ<y"<6
bfh.bfType=((WORD)('M'<< 8)|'B'); !"2nL%PW~
bfh.bfSize=54+size; #h@/~x r
bfh.bfOffBits=54; R 2uo ZA,
CFile bf; !3{>
F"
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C>q,c3s5
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g_G'%{T7
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2*6b{}yJH
bf.WriteHuge(lpData,size); /jQW4eW0
bf.Close(); ZqQJFyV*
nCount++; I| qoH N,g
} /wB<1b"
GlobalFreePtr(lpData); uI7 d?s
if(nCount==1) !HM|~G7
m_Number.Format("%d picture captured.",nCount); 48CLnyYiF
else H/>86GG
m_Number.Format("%d pictures captured.",nCount); oagxTFh8~
UpdateData(FALSE); q/Dc*Qn
m
} <@9p|[!
=PiDZS^"
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) HTK79
+
{ AvdxDN
if(pMsg -> message == WM_KEYDOWN) P
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{ d/G`w{H}y
if(pMsg -> wParam == VK_ESCAPE) =j]us?5
return TRUE; I"4j152P|
if(pMsg -> wParam == VK_RETURN) " d3pkY
return TRUE; |:SBkM,
} 1;<J] S$$
return CDialog::PreTranslateMessage(pMsg); T8 k@DS
} u+eA>{
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LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zhbp"yju7
{ 9WsPBzi"T
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ XJ~_FiB
SaveBmp(); `y; s1nL
return FALSE; 5n,?>>p$
} E.]sX_X?
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p#W[he
CMenu pop; iha{(-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [pOQpfo\
CMenu*pMenu=pop.GetSubMenu(0); m5lMh14E
pMenu->SetDefaultItem(ID_EXITICON); 7u]0dHj
CPoint pt; t>QAM6[
GetCursorPos(&pt); Jw'%[(q
Q
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +!IIt {u
if(id==ID_EXITICON) $E@L{5Yt
DeleteIcon(); |'WaBy1
else if(id==ID_EXIT) +U9Gj#
OnCancel(); DTrS9j?z
return FALSE; 4:-h\%
} !uLW-[F,
LRESULT res= CDialog::WindowProc(message, wParam, lParam); QLYb>8?"C
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) bE
_=L=NG
AddIcon(); iva&W
return res; W8j)2nKD
} L
DD^X@q
OI"vC1.5
void CCaptureDlg::AddIcon() /gZrnd?
{ Qhb].V{utV
NOTIFYICONDATA data; S~fQ8t70
data.cbSize=sizeof(NOTIFYICONDATA); $e#p -z
CString tip; l\7N R
tip.LoadString(IDS_ICONTIP); '+1<7jl&I
data.hIcon=GetIcon(0); s0"S;{_#
data.hWnd=GetSafeHwnd(); r+fR^hv
strcpy(data.szTip,tip); K*Y.mM)
data.uCallbackMessage=IDM_SHELL; :nYl]Rm
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #W,BUN}
data.uID=98; _sIhQ8$:
Shell_NotifyIcon(NIM_ADD,&data); ab8uY.j
ShowWindow(SW_HIDE); *[jG^w0z8~
bTray=TRUE; ]Ln2|$R
}
z"8%W?o>
WmTSxneo
void CCaptureDlg::DeleteIcon() Szrr`.']
{ 8MgoAX,p
NOTIFYICONDATA data; _7>$'V{
data.cbSize=sizeof(NOTIFYICONDATA); f^il|Obzl
data.hWnd=GetSafeHwnd(); ;:Q 5?zM
data.uID=98; Uj&2'>MJ$
Shell_NotifyIcon(NIM_DELETE,&data); B
Jp\a7`;
ShowWindow(SW_SHOW); ?1JVzZ4H
SetForegroundWindow(); ;Pik},
ShowWindow(SW_SHOWNORMAL); =vLeOX
bTray=FALSE; \tTZN
} =8S*t5
=,&PD(.
void CCaptureDlg::OnChange() +h^>?U,
{ &gxRw l
RegisterHotkey(); h')@NnFP1
} S(Md
5qtZ`1Hq
BOOL CCaptureDlg::RegisterHotkey() Q{6Bhx *>
{ ss'#sPX
UpdateData(); :U!kn b"/>
UCHAR mask=0; ez_qG=J .
UCHAR key=0; UR6.zE4=_
if(m_bControl) ,<n >g;
mask|=4; xlG/$`Ab
if(m_bAlt) YIo$
mask|=2; z/u;afB9q
if(m_bShift) {Y-<#U~iH
mask|=1; o
%sBU
key=Key_Table[m_Key.GetCurSel()]; q
y73
if(bRegistered){ 57IAH$n8o
DeleteHotkey(GetSafeHwnd(),cKey,cMask); YG ,
bRegistered=FALSE; 3RG*:9
} :5hKE(3Q
cMask=mask;
'&,$"QXwE
cKey=key; MIvAugUOl
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ,R/HT@
return bRegistered; r4/G&m[V
} 0FmYM@Wc
3Z#k9c_b
四、小结 Gqq%q!k&1
aOWW..|
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。