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:
u-$AFSt
LGkKR{ep( 一、实现方法
X5=7DE] Qy%/+9L 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
bE{`g]C5 Gy5W;,$q #pragma data_seg("shareddata")
:1I,:L HHOOK hHook =NULL; //钩子句柄
TnrMR1Zx UINT nHookCount =0; //挂接的程序数目
/WMLr5 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
P#C`/%$S static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
b~p < static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
( KrIMZ static int KeyCount =0;
t +VPX2 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
{u5@Yp #pragma data_seg()
qi$8GX=~r uo^>95lkv 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
+}!eAMQ VI4d/2e DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
?bEYvHAzg 0#ph1a< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
gVc[`(@h cKey,UCHAR cMask)
~Hq
2' {
_gHJ4(?w BOOL bAdded=FALSE;
e-WaK0Ep for(int index=0;index<MAX_KEY;index++){
?!ig/ufZ if(hCallWnd[index]==0){
d$ /o\G hCallWnd[index]=hWnd;
K:0RP?L HotKey[index]=cKey;
T
&1sfS, HotKeyMask[index]=cMask;
S70ERRk bAdded=TRUE;
Jg:'gF]jt KeyCount++;
[O3R(`<e5 break;
GZ%RfKyQ }
*e R$ }
p ,!`8c6 return bAdded;
ifkA3] }
Mm5l> D'c //删除热键
T "z!S0I BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(?Yz#Yf {
+1Uw <~ BOOL bRemoved=FALSE;
]3v for(int index=0;index<MAX_KEY;index++){
JBqzQ^[n if(hCallWnd[index]==hWnd){
$]vR ,E if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
a36<S0R hCallWnd[index]=NULL;
&HE8O}<> HotKey[index]=0;
3ySnA AG HotKeyMask[index]=0;
v-kH7H"z bRemoved=TRUE;
E-/]UH3u H KeyCount--;
`>V.}K^4 break;
Av'H(qB\K }
7J_H Ox# }
F"q3p4-<> }
1+^c3Dd` return bRemoved;
k;)L-ge9 }
Lh+^GQ :KFhryN :+YFO.7 DLL中的钩子函数如下:
q*T+8O PU8R
0r2k\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
k`?n("j {
oyHjdPdY# BOOL bProcessed=FALSE;
$R^"~|m3M if(HC_ACTION==nCode)
Y3thW@mD05 {
\+,jM6l}- if((lParam&0xc0000000)==0xc0000000){// 有键松开
5Hr"}|J<8 switch(wParam)
[~J4:yDd= {
WN0^hDc- case VK_MENU:
ZK;HW MaskBits&=~ALTBIT;
k~?@~xm,R break;
>Nov9<p case VK_CONTROL:
'HC4Q{b` MaskBits&=~CTRLBIT;
xGA%/dy,; break;
2@ad! h case VK_SHIFT:
i^n&K:6 MaskBits&=~SHIFTBIT;
]t,ppFC# break;
| o?@Eh default: //judge the key and send message
;%U`P8b! break;
G~_dSa@g G }
hGpaHY>My for(int index=0;index<MAX_KEY;index++){
IE|$>q0Z if(hCallWnd[index]==NULL)
n>@(gDq continue;
ThHK1{87X} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
uv@4/M` {
]-O:| q>] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
7==Uoy*O bProcessed=TRUE;
(BJs6":BFe }
K
<0ItNv }
6l50IWj,T }
1|zo-'y else if((lParam&0xc000ffff)==1){ //有键按下
:+u?A switch(wParam)
^rx]Y; {
Pp}j=$&j\ case VK_MENU:
Kj'uTEM MaskBits|=ALTBIT;
3c6#?<%0` break;
~O<Bs{8 case VK_CONTROL:
#vIF]Y MaskBits|=CTRLBIT;
#"TTI
vd0 break;
v67o>`<$ case VK_SHIFT:
aK,G6y MaskBits|=SHIFTBIT;
kQYX[e7n break;
:#+VH_%N default: //judge the key and send message
^Zg"`&E break;
chxO*G }
vmL0H)q for(int index=0;index<MAX_KEY;index++){
%POoyH@D} if(hCallWnd[index]==NULL)
Peb;XI continue;
pwm]2}+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
65g\WB+/ {
z0c_&@uj* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`,xKK+~YG- bProcessed=TRUE;
3]V"9+ }
'./s'!Lj }
nqr[HFWs }
+Ge-!&.;A if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
'b%S3)} for(int index=0;index<MAX_KEY;index++){
p*vEVo if(hCallWnd[index]==NULL)
|o6B:NH,rg continue;
)/Ul"QF if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
q&7J1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Yf<6[(6 O //lParam的意义可看MSDN中WM_KEYDOWN部分
_},u[+ }
=`u4xa#m }
IojF/ }
IE,xiV return CallNextHookEx( hHook, nCode, wParam, lParam );
E7ixl~ }
HPT$)NeNc ]H%y7kH8 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
EE-jU<>| R0AVAUG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
F`+}p- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Y=\;$:L[ bfhap(F~(e 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:
P6@(nGgK< r,a V11{ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
.r $d
8J {
EN'}+E
8 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
|cUTP!iy {
+O2T% //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1r'skmxq SaveBmp();
xmsw'\ return FALSE;
+<7`Gn(n3 }
zq _*)V …… //其它处理及默认处理
E:!?A@Fy }
{ LZ` _1D wgp{P>oBX ^1nQDd* 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
[AA'Ko :*k 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
t&*X~(Yb! }\?UmuolQ 二、编程步骤
x(ue
|UG s8Bbet 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
tUaDwIu# 5R"iF+p4 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
2M1}`H\ ;Hk{bz( 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
R9xhO! __O@w. 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
DSf P;GRk6 5、 添加代码,编译运行程序。
D;*P'%_Z mW-4 三、程序代码
gE;r;#Jt4 `v)
:|Q ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
}]VFLBl`w #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
FX}kH ] #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
LpN_s# #if _MSC_VER > 1000
2SVBuV/R #pragma once
]jQj/`v1 #endif // _MSC_VER > 1000
X+dLk(jI`u #ifndef __AFXWIN_H__
vVBu/) #error include 'stdafx.h' before including this file for PCH
X?kw=x{2P #endif
l/ufu[x!a #include "resource.h" // main symbols
J'4Pp< class CHookApp : public CWinApp
a/p}
?!\ {
qJN!L)) public:
_[IOPHa" CHookApp();
O1xK\ogv // Overrides
v{tw ;Z# // ClassWizard generated virtual function overrides
g4z*6L,u //{{AFX_VIRTUAL(CHookApp)
7\.{O$Q public:
^6g^ Q*" virtual BOOL InitInstance();
J;8M._ virtual int ExitInstance();
:Q]P=-Y8 //}}AFX_VIRTUAL
pg0Sq9qCN //{{AFX_MSG(CHookApp)
dA03,s // NOTE - the ClassWizard will add and remove member functions here.
IPHZ~'M // DO NOT EDIT what you see in these blocks of generated code !
xNAX)v3Z //}}AFX_MSG
Q^trKw~XNy DECLARE_MESSAGE_MAP()
'/O >#1 };
L/*D5k%J LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
/hF@Xh%hY BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
w&F.LiX^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
;8Qx~:c BOOL InitHotkey();
}%)]b*3 BOOL UnInit();
[8%R*} #endif
:LrB9Cf$n r{g8CIwGQ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
+PAb+E|, #include "stdafx.h"
"@ 1+l& #include "hook.h"
sx1w5rj.Y0 #include <windowsx.h>
@{V bu #ifdef _DEBUG
fmgXh)= #define new DEBUG_NEW
?q{HS&k #undef THIS_FILE
+%sMd]$,n static char THIS_FILE[] = __FILE__;
#EG$HX] #endif
-F7P$/9 #define MAX_KEY 100
^jYE4gHM #define CTRLBIT 0x04
i(O+XQ}Fyx #define ALTBIT 0x02
|&u4Q /0 #define SHIFTBIT 0x01
@h=r;N#/`P #pragma data_seg("shareddata")
,azBk`$iQr HHOOK hHook =NULL;
vCX
54 UINT nHookCount =0;
5.M82rR;~ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Gov]^?^D- static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
!FA[
]d 4 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
9 `+RmX;m static int KeyCount =0;
~8 S2BV3@ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
%n B}Hq ; #pragma data_seg()
P1G;JK HINSTANCE hins;
&iI5^b-P void VerifyWindow();
)=TS)C4 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
\p.eY)> //{{AFX_MSG_MAP(CHookApp)
JavSR1_ // NOTE - the ClassWizard will add and remove mapping macros here.
CpLLsp hy // DO NOT EDIT what you see in these blocks of generated code!
2'U+QK@ //}}AFX_MSG_MAP
2%_UOEayU END_MESSAGE_MAP()
FKWL{"y }'u0Q6Obj CHookApp::CHookApp()
h?7@]&VJ {
D}T+X;u)K // TODO: add construction code here,
+yd{-iH // Place all significant initialization in InitInstance
nnZM{<!hF }
;%^T*?t Lj2Au_5 CHookApp theApp;
%X -G(Z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Qv
B%X)J {
}cO}H2m BOOL bProcessed=FALSE;
]k)h<)nY if(HC_ACTION==nCode)
#-7w| {
}AGdWt@ if((lParam&0xc0000000)==0xc0000000){// Key up
R>B4v+b switch(wParam)
WH l vd {
]I:h4hgw case VK_MENU:
ydMfV- MaskBits&=~ALTBIT;
f#3!Q!C^ break;
>A.m`w case VK_CONTROL:
I*4g ;1x MaskBits&=~CTRLBIT;
? t_$C,A+ break;
pxV@ fH+` case VK_SHIFT:
=z4kK_?F, MaskBits&=~SHIFTBIT;
~]78R!HJ break;
9jf2b default: //judge the key and send message
~8tb^ break;
9B9:lR }
chszP{-@X for(int index=0;index<MAX_KEY;index++){
mw flx8 if(hCallWnd[index]==NULL)
4fL/,j/^ continue;
+
0 |d2_]E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ay>u``$R {
ZIp"X SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
->*'Y;t4 bProcessed=TRUE;
:<PwG]LO }
rvETt }
VWT\wAL }
Z"5ewU<? else if((lParam&0xc000ffff)==1){ //Key down
E-i<^&E switch(wParam)
|m>{< : {
E3d# T case VK_MENU:
j6#RV@ p` MaskBits|=ALTBIT;
vN$j@h . break;
r8TNl@Z case VK_CONTROL:
7thB1cOJ MaskBits|=CTRLBIT;
@f%q ,: break;
A5kz(pj case VK_SHIFT:
w6G<&1iH MaskBits|=SHIFTBIT;
!_pryNcb break;
{Ax{N default: //judge the key and send message
cwBf((~ break;
pa2cM%48 }
p^X
\~Yibs for(int index=0;index<MAX_KEY;index++)
P<MNwdf(+ {
|n*<H| if(hCallWnd[index]==NULL)
1gh<nn continue;
-Ou@T#h" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a9niXy}a( {
F8OE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S T25RJC bProcessed=TRUE;
I7} o>{ }
I1fUV72 }
s* UO!bH a }
!fK9YW(Im if(!bProcessed){
99u9L) for(int index=0;index<MAX_KEY;index++){
+kZW:t!- if(hCallWnd[index]==NULL)
sY@x(qkIOc continue;
<p\iB'y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ofHe8a8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\Ss6F]K] }
rFU|oDF }
+Q! }
9MR,3/&N return CallNextHookEx( hHook, nCode, wParam, lParam );
Oq4J$/% }
| x/Z
qY *WK0dn BOOL InitHotkey()
q&0I7OV {
h?+bW'm if(hHook!=NULL){
" twq#Alx nHookCount++;
1jkMje return TRUE;
Bv(c`JE~; }
kzXmiBL<9 else
%2z]2@ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
:vRUb>z if(hHook!=NULL)
|}2X|4&X nHookCount++;
AD4Ot5 return (hHook!=NULL);
i2Cw#x0s }
`&!J6)OJ BOOL UnInit()
ar[*!:! {
(|_N2R! if(nHookCount>1){
61=D&lb nHookCount--;
a534@U4, return TRUE;
LS{t7P9K }
iw?*Wp25 BOOL unhooked = UnhookWindowsHookEx(hHook);
zD%@3NA41 if(unhooked==TRUE){
e
QGhX( nHookCount=0;
`2.2; Vk hHook=NULL;
'/v@q]! }
a^QyYX}\qR return unhooked;
?R8wm E[w }
J-)9>~[E< TaTs-]4 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0VBbSn}Z< {
+ht{ARX2( BOOL bAdded=FALSE;
uSU[Y,'x for(int index=0;index<MAX_KEY;index++){
|A% Jx__ if(hCallWnd[index]==0){
A0`#n|(Ad! hCallWnd[index]=hWnd;
Z+]Uw HotKey[index]=cKey;
mOE%:xq9- HotKeyMask[index]=cMask;
_pe_w{V-b6 bAdded=TRUE;
w0!4@ KeyCount++;
TX7]$Wj break;
VdetY\ }
<Zn-P }
YH^h?s return bAdded;
Tye[iJ }
Q{"QpVY8 QM'Db`B BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
MPI=^rc2 {
`am]&0g^+( BOOL bRemoved=FALSE;
\.,qAc\[ for(int index=0;index<MAX_KEY;index++){
"Acc]CqH* if(hCallWnd[index]==hWnd){
l\%LT{$e if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
%?WR9}KU0 hCallWnd[index]=NULL;
N6wCCXd HotKey[index]=0;
[/iT D=O, HotKeyMask[index]=0;
JLFZy\ bRemoved=TRUE;
>Qg 9KGk' KeyCount--;
D`C#O
7.N break;
?N/6m }
L}x,>hbT }
: ZWKrnG }
g&oAa;~o return bRemoved;
S#wy+* }
QFYO_$1Y) *%,{<C,Y void VerifyWindow()
eK=<a<tx {
fu]mxGPc for(int i=0;i<MAX_KEY;i++){
jJOs`'~Q\ if(hCallWnd
!=NULL){ cN(Toj'`
if(!IsWindow(hCallWnd)){ >*FH JCe
hCallWnd=NULL; DLP
G
HotKey=0; ^^C@W?.z
HotKeyMask=0; JX! @j3
KeyCount--; ?5e]^H}
} _I1:|y
} WXzSf.8p|
} W-UMX',0zS
} i`hr'}x
ZgD%*bH*B
BOOL CHookApp::InitInstance() 6-oy%OnN
{ 5gZ6H/.
AFX_MANAGE_STATE(AfxGetStaticModuleState()); bxrT[]
hins=AfxGetInstanceHandle(); 9KgGK cy%
InitHotkey(); *~>}*
return CWinApp::InitInstance(); vz1yH%~E
} CfMCc:8mL
7u|X
.X
int CHookApp::ExitInstance() >ukn<
{ aB*'DDlx"r
VerifyWindow(); w28&qNha
UnInit(); ZCC T
return CWinApp::ExitInstance(); hq|I%>y
} {IgLH`@
|mp~d<&
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [0M`uf/u
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 92 oUQ EK
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y`Nprwb
#if _MSC_VER > 1000 CAT{)*xc
#pragma once JV`"kk/
#endif // _MSC_VER > 1000 FD[o94`%
=73aME}
class CCaptureDlg : public CDialog o6Jhl8
{ +
\jn$>E
// Construction kE`Fg(M
public: ;ZtN9l
BOOL bTray; 9pMXjsE
BOOL bRegistered; pt_]&3\e
BOOL RegisterHotkey(); ya'Ma<4
UCHAR cKey; IDK~
(t
UCHAR cMask; Z(Z$>P&4
void DeleteIcon(); 9@^N*
E+
void AddIcon(); N#<X"&-_#
UINT nCount; o#\c:D*k
void SaveBmp(); dIq*"Ry+~
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8mM`v
// Dialog Data i*jnC>
//{{AFX_DATA(CCaptureDlg) UpSa7F:Uw
enum { IDD = IDD_CAPTURE_DIALOG }; TR&7AiqB
CComboBox m_Key; 8I]rC<O6:
BOOL m_bControl; C1w6[f1+
BOOL m_bAlt; #DA ,*
BOOL m_bShift; Ov~vK\
CString m_Path; =v(&qh9Q2
CString m_Number; 's\rQ-TV
//}}AFX_DATA Ie7S'.Lmq
// ClassWizard generated virtual function overrides ;;}}uW=
//{{AFX_VIRTUAL(CCaptureDlg) b`fWT:?=
public: oEJxey]B7
virtual BOOL PreTranslateMessage(MSG* pMsg); ufB9\yl{~
protected: %zYTTPLZ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9ePR6WS4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2=
)V"lR\
//}}AFX_VIRTUAL q"-+`;^7(-
// Implementation E^C [G)7n
protected: UWW'[gEP1
HICON m_hIcon; -?L3"rxAP
// Generated message map functions R@
MXwP
//{{AFX_MSG(CCaptureDlg) wJg&OQc9
virtual BOOL OnInitDialog(); ,E&W{b
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4&<zkAMR
afx_msg void OnPaint(); M Ui#3o\f
afx_msg HCURSOR OnQueryDragIcon(); Sd *7jW?
virtual void OnCancel(); 4bq+(CI6
afx_msg void OnAbout(); xA>3]<O
afx_msg void OnBrowse(); ,!bcm
afx_msg void OnChange(); p]Q(Z
//}}AFX_MSG 0Ci:w|J
DECLARE_MESSAGE_MAP() %:.IG.`d
}; nnuJY$O;M
#endif 6.M!WK{+
^:2>I $
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "Xj>dB1~
#include "stdafx.h" -ze@~Z@
#include "Capture.h" X=[`+=
#include "CaptureDlg.h" tg;AF<VI
#include <windowsx.h> ?jn";:
#pragma comment(lib,"hook.lib") s@K #M
#ifdef _DEBUG keS%w]87
#define new DEBUG_NEW e^h4cC\^
#undef THIS_FILE kj@m5`G
static char THIS_FILE[] = __FILE__; eo<=Q|nI&
#endif 7!q.MOYm
#define IDM_SHELL WM_USER+1 !$!"$-5
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (P 9$Ei0fv
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0c]3 ,#
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ee*E:Ltz\
class CAboutDlg : public CDialog `_E@cZ4
{ $`txU5#vs
public: 7Yly^
CAboutDlg(); ^fhkWx 4i
// Dialog Data %5/h;4
//{{AFX_DATA(CAboutDlg) TN.&FDqC9
enum { IDD = IDD_ABOUTBOX }; ^w~Utx4
//}}AFX_DATA qdwjg8fo4Z
// ClassWizard generated virtual function overrides L7B(abT9e
//{{AFX_VIRTUAL(CAboutDlg) PHqIfH [
protected: JDm7iJxc_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NplkhgSj
//}}AFX_VIRTUAL S*a_
// Implementation K2ry@haN
protected: pd oCV
//{{AFX_MSG(CAboutDlg) "kkZK=}Nv
//}}AFX_MSG _.BX#BIF
DECLARE_MESSAGE_MAP() #3((f[
}; so }Kb3 n
[(/IV+
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <m+$@:cO
{ 2w67>w\
//{{AFX_DATA_INIT(CAboutDlg) S<DS|qOo
//}}AFX_DATA_INIT Cs8e("w
} |d=MX>i|G
)Tj\ym-Vl
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3&7$N#v
{ ,XmyC7y<
CDialog::DoDataExchange(pDX); a[Oi
//{{AFX_DATA_MAP(CAboutDlg) H8?Kgaj~vf
//}}AFX_DATA_MAP :EZ"D#>y~
} }|4dEao\
CDgu`jj%]
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Wf:I
0
//{{AFX_MSG_MAP(CAboutDlg) J(%kcueb
// No message handlers #ZPy&GIr
//}}AFX_MSG_MAP l} UOg
END_MESSAGE_MAP()
X00!@
^g
9Sk?tl
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [";<YR7iRN
: CDialog(CCaptureDlg::IDD, pParent) ]BBL=$*
{ :{KoZd
//{{AFX_DATA_INIT(CCaptureDlg) 5b-: e? |
m_bControl = FALSE; tO]`
I-
m_bAlt = FALSE; Hm55R
m_bShift = FALSE; Rjz~n38.
m_Path = _T("c:\\"); d}RR!i`<N
m_Number = _T("0 picture captured."); s7}46\/U
nCount=0; fS(IN~
bRegistered=FALSE; "Rv],O"
bTray=FALSE; isR|K9qf^
//}}AFX_DATA_INIT tN:PWj5
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 l:H}Y3_I
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); h$~\to$C
} dSm; e_s
BV01&.<|
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?O<D&CvB
{ >g FEA0-
CDialog::DoDataExchange(pDX); 9WhZ=
Xk
//{{AFX_DATA_MAP(CCaptureDlg) Z/hgr|&}
DDX_Control(pDX, IDC_KEY, m_Key); @>sZ'M2mq
DDX_Check(pDX, IDC_CONTROL, m_bControl); JM-+p
DDX_Check(pDX, IDC_ALT, m_bAlt); I?!7]S n$
DDX_Check(pDX, IDC_SHIFT, m_bShift); 2RC|u?+@
DDX_Text(pDX, IDC_PATH, m_Path); _r&,n\
T
DDX_Text(pDX, IDC_NUMBER, m_Number); N9A#@c0O
//}}AFX_DATA_MAP `c~J&@|
} Z&E!m
oWo/QNw9
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I>( \B| \6
//{{AFX_MSG_MAP(CCaptureDlg) *c6o#[l
ON_WM_SYSCOMMAND() 5x:dhkW
ON_WM_PAINT() rW(<[2 vg
ON_WM_QUERYDRAGICON() l4+Bs!i`
ON_BN_CLICKED(ID_ABOUT, OnAbout) @XL5$k[Y
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) nD51,1>
ON_BN_CLICKED(ID_CHANGE, OnChange) =~f\m:Y
//}}AFX_MSG_MAP BQfq]ti
END_MESSAGE_MAP() P 4|p[V8
X|w[:[P
BOOL CCaptureDlg::OnInitDialog() swh8-_[c/
{ yhpeP
CDialog::OnInitDialog(); <yHa[c`L
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); C[xY 0<^B
ASSERT(IDM_ABOUTBOX < 0xF000); (7Q
Fy
CMenu* pSysMenu = GetSystemMenu(FALSE);
~!& "b1
if (pSysMenu != NULL) k Z>Xl- LV
{ NP#:} )
CString strAboutMenu; QwSYjR:K
strAboutMenu.LoadString(IDS_ABOUTBOX); }[>X}"_e
if (!strAboutMenu.IsEmpty()) BrO" _
{ FbWcq_
pSysMenu->AppendMenu(MF_SEPARATOR); q&RezHK l
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @jxAU7!
} Z/f%$~Ch
} RU_wr<
SetIcon(m_hIcon, TRUE); // Set big icon 88l\8k4r
SetIcon(m_hIcon, FALSE); // Set small icon @z-%:J/$
m_Key.SetCurSel(0); NM{/rvM
RegisterHotkey(); f6r~Ycf,f
CMenu* pMenu=GetSystemMenu(FALSE); XDdF7i}
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); /eO:1c
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zG. \xmp
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "A]Xe[oS
return TRUE; // return TRUE unless you set the focus to a control UTLuzm
} -0>gq$/N=^
Sd |=*X
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "h'+!2mf
{ Sbp].3^j
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~]_U!r[FA
{ H-|%\9&{S
CAboutDlg dlgAbout; Ok V*,n
dlgAbout.DoModal(); h7"c_=w+
} P\lEfsuR
else L]kd.JJvy
{ o<8('j
CDialog::OnSysCommand(nID, lParam); nUy. gAb
} N7
FndB5%
} S<Os\/*
js..k*j
void CCaptureDlg::OnPaint() rijavZS6
{ LN0pC}F
if (IsIconic()) 9>6DA^
{ u$38"&cmA
CPaintDC dc(this); // device context for painting )p^" J|
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x=M%QFe
// Center icon in client rectangle X;&Iu{&=
int cxIcon = GetSystemMetrics(SM_CXICON); tSVWO]<
int cyIcon = GetSystemMetrics(SM_CYICON); =f/CBYNw@V
CRect rect; 2t[P-on
GetClientRect(&rect); 4Y5lP00!}
int x = (rect.Width() - cxIcon + 1) / 2; QHDR*tB:{
int y = (rect.Height() - cyIcon + 1) / 2; !y\r.fm!A
// Draw the icon /Bw
<?:
dc.DrawIcon(x, y, m_hIcon);
-k8<LR3
} mfqnRPZ
else T@%\?=P
{ 9,wD
CDialog::OnPaint(); hl]q6ZK!6
} 0H/)wy2ym
} *671MJ9
3%[;nhbA7
HCURSOR CCaptureDlg::OnQueryDragIcon() 1PB"1.wnd
{ "P9(k>
return (HCURSOR) m_hIcon; &"r /&7:
} kz\Ss|jl
x fa-
void CCaptureDlg::OnCancel() X`6"^
xme
{ N<PDQ
if(bTray) ({OQ
JBC
DeleteIcon(); (QTF+~)
CDialog::OnCancel(); K0YQ b&*k
} 7tbY>U8
@PT([1C
void CCaptureDlg::OnAbout() -|GKtZ]}
{ ZXIw^!8@/
CAboutDlg dlg; @C|nc&E2s
dlg.DoModal(); GEK7q<
} 'Qh1$X)R7a
} J[Z)u
void CCaptureDlg::OnBrowse() @ry/zG#
{ lvsj4cT
CString str; 6CCm1F{`
BROWSEINFO bi; U`aB&[=$
char name[MAX_PATH]; [{$%9lm
ZeroMemory(&bi,sizeof(BROWSEINFO)); e }Mf
bi.hwndOwner=GetSafeHwnd(); eaC%&k
bi.pszDisplayName=name; p|C[T]J\@
bi.lpszTitle="Select folder"; 0NeIQr1N_
bi.ulFlags=BIF_RETURNONLYFSDIRS; <D[0mi0
LPITEMIDLIST idl=SHBrowseForFolder(&bi); .ht-*
if(idl==NULL) lSg[7lt
return; I>GBnx
L
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); iF9d?9TWl
str.ReleaseBuffer(); {h=gnR-9
m_Path=str; =EYWiK77a
if(str.GetAt(str.GetLength()-1)!='\\') pM^Z C
m_Path+="\\"; \h"U+Bv7
UpdateData(FALSE); o_1N "o%
} Mj{w/'
W=#AfPi$&
void CCaptureDlg::SaveBmp() ?-zuy US
{ $J^fp XO
CDC dc; AhD C5ue=
dc.CreateDC("DISPLAY",NULL,NULL,NULL); F"bz<{
CBitmap bm; 9QaE)wt
int Width=GetSystemMetrics(SM_CXSCREEN); V)5K/ U{
int Height=GetSystemMetrics(SM_CYSCREEN); vK%*5
bm.CreateCompatibleBitmap(&dc,Width,Height); QtwQVOK
CDC tdc; D#AqZS>B
tdc.CreateCompatibleDC(&dc); S=0DQ19
CBitmap*pOld=tdc.SelectObject(&bm); ruQt0q,W3%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -V:HT
j
tdc.SelectObject(pOld); `%
QvCAR
BITMAP btm; n1JtY75#,/
bm.GetBitmap(&btm); TF%Xb>jy[
DWORD size=btm.bmWidthBytes*btm.bmHeight; LFI#wGhXVk
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *f3S tX
BITMAPINFOHEADER bih; \ )=WA!
bih.biBitCount=btm.bmBitsPixel; 0$]iRE;O]
bih.biClrImportant=0; FpiTQC7d
bih.biClrUsed=0; zs~Tu
bih.biCompression=0; .[}G{%M~[
bih.biHeight=btm.bmHeight; {"+M%%`*#
bih.biPlanes=1; (-g*U#
bih.biSize=sizeof(BITMAPINFOHEADER); a%e`
bih.biSizeImage=size; V
^+p:nP
bih.biWidth=btm.bmWidth; ;F#(:-:
bih.biXPelsPerMeter=0; p]%di8&;N
bih.biYPelsPerMeter=0; qXg&E}]:=
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); *68 TTBq(
static int filecount=0; ":_II[FPY
CString name; VJ=>2'I
name.Format("pict%04d.bmp",filecount++); CVWT>M<
name=m_Path+name; g"Y_!)X
BITMAPFILEHEADER bfh; .G8>UXX
bfh.bfReserved1=bfh.bfReserved2=0; $'%GB $.
bfh.bfType=((WORD)('M'<< 8)|'B'); &s='$a;4
bfh.bfSize=54+size; T#H^
}`
bfh.bfOffBits=54; c7jmzo
CFile bf; {u/1ph-
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Lxwi"ndP
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); aknIrblS\
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F?|Efpzow?
bf.WriteHuge(lpData,size); 9H/>M4RT
bf.Close(); FDQ=$w}'>
nCount++; pY`$k#5
} CtXbAcN2B
GlobalFreePtr(lpData); Td'Mc-/
if(nCount==1) VD$5 Djq
m_Number.Format("%d picture captured.",nCount); jZ|M$I3*
else R(d<PlZ
m_Number.Format("%d pictures captured.",nCount); )A$"COM4
UpdateData(FALSE); PqV
F}
} =3.dgtH
b)<WC$"
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) N<9 c/V
{ ^o{{kju
if(pMsg -> message == WM_KEYDOWN) +Yc^w5 !(
{ /[<F
f
if(pMsg -> wParam == VK_ESCAPE) v-tI`Qpb
return TRUE; SO=gG 2E
if(pMsg -> wParam == VK_RETURN) :$$~$P
return TRUE; x
;|HT
} nwU],{(Hgr
return CDialog::PreTranslateMessage(pMsg); z'U.}27&o
} -K 'UXoU1
1ysfpX{=
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XI\Slq
{ fAgeF$9@
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ cu N9RG
SaveBmp(); Y(g_h:lf,]
return FALSE; w$:\!FImx
} =&z+7Pe[
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7GOBb|
CMenu pop; 8Yh'/,o=L#
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bzFac5n)Q
CMenu*pMenu=pop.GetSubMenu(0); G*I
pMenu->SetDefaultItem(ID_EXITICON); ^OKm (
CPoint pt; h mRmU{(Y
GetCursorPos(&pt); &DWSf`:Hx
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o8R_Ojh
if(id==ID_EXITICON) = LNU%0m
DeleteIcon(); 0]4X/u#N
else if(id==ID_EXIT) CPJ21^
OnCancel(); X"!j_*&ED
return FALSE; g8Ex$,\,
} ~#E&E%sJ
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^Kz?SO
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) },8|9z#pyB
AddIcon(); ] 0X|_bU
return res; ,D;8~llM
} /x??J4r0
C}h(WOcr`X
void CCaptureDlg::AddIcon() K1 "HJsj
{ AkQ(V
NOTIFYICONDATA data; M{J>yN
data.cbSize=sizeof(NOTIFYICONDATA); nK;d\DO
CString tip; !, BJO3&
tip.LoadString(IDS_ICONTIP); 6{I7)@>N
data.hIcon=GetIcon(0); G`!,>n 3
data.hWnd=GetSafeHwnd(); VZi1b0k1.
strcpy(data.szTip,tip); AwZ@)0Wy
data.uCallbackMessage=IDM_SHELL; k* C69
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;
=`3r'c
data.uID=98; VeWh9:"bJ
Shell_NotifyIcon(NIM_ADD,&data); nX (bVT4i
ShowWindow(SW_HIDE); )Z:-qH
bTray=TRUE; D,cD]tB2
} xw8k<`
hoFgs9
void CCaptureDlg::DeleteIcon() [)I^v3]U
{ }ppApJT
NOTIFYICONDATA data; ec!e
data.cbSize=sizeof(NOTIFYICONDATA); Z;uKnJh
data.hWnd=GetSafeHwnd(); 0XA\Ag\`G
data.uID=98; K6->{!8]k
Shell_NotifyIcon(NIM_DELETE,&data); C1;uAw?\
ShowWindow(SW_SHOW); >Lcu
SetForegroundWindow(); DghyE`
ShowWindow(SW_SHOWNORMAL); r ~{nlLO}
bTray=FALSE; D9g*+KM&
} u0wu\
oO
tjG3B({
void CCaptureDlg::OnChange() gv eGBi
{ "Erphn
RegisterHotkey(); s]m]b#1!r
} @wXYza0|d
Zna6-0o
BOOL CCaptureDlg::RegisterHotkey() e)HFI|>
{ D\G 8p;
UpdateData(); \;-Yz
UCHAR mask=0; C/!P&`<6
UCHAR key=0; f4S}Nga(
if(m_bControl)
@>z.chM;
mask|=4; }!K
#
if(m_bAlt) ;ab[YMkH
mask|=2; D!* SA
if(m_bShift) `m'RvU c
mask|=1; k
x:+mF
key=Key_Table[m_Key.GetCurSel()]; PlCw,=K 8f
if(bRegistered){ GNW$:=0u
DeleteHotkey(GetSafeHwnd(),cKey,cMask); F42^Uoaz
bRegistered=FALSE; LiEEQ
} %;wDB2k*
cMask=mask; `V/kM0A5
cKey=key; # 9bw'm
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F4=X(P_6
return bRegistered; =>S[Dh
} l%V+]skS
|3k r*#
四、小结 &(<Gr0
~e|E5[-i
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。