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:
,miU'<8tQ|
i)Vqvb0Q 一、实现方法
a"&@G=M@d V=I au_ 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:
di]z r.**
z j #pragma data_seg("shareddata")
t*5d'aE`/ HHOOK hHook =NULL; //钩子句柄
T9jp* UINT nHookCount =0; //挂接的程序数目
M.zS + static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
8Y3c,p/gS> static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
[4]lAxrRF static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
38b%km# static int KeyCount =0;
8kXbyKX[b static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
1el?f> #pragma data_seg()
~;_]U[eOL .%+'Ts#ie 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。
p%+ 0^]v1 +2O('}t 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:
4,tMaQ L7_(KC h BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
iaQ[}'6!$ cKey,UCHAR cMask)
I:U /%cr, {
fc._*y#AS BOOL bAdded=FALSE;
F8Z<JcOI for(int index=0;index<MAX_KEY;index++){
~0w7E0DE[ if(hCallWnd[index]==0){
gZuk( hCallWnd[index]=hWnd;
iN8?~T}w HotKey[index]=cKey;
LO[1xE9 HotKeyMask[index]=cMask;
v Q[{<|K bAdded=TRUE;
n{d}]V@ KeyCount++;
F7^8Ej9*a break;
5u T
9ssC }
>/;\{IG
Wn }
h?j;*|o- return bAdded;
0){%4 }
,pa,:k? //删除热键
\=Af AO@ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
wYSvI {
Fkuq'C<|Y BOOL bRemoved=FALSE;
ZLyJ for(int index=0;index<MAX_KEY;index++){
H$KE*Wwq if(hCallWnd[index]==hWnd){
R"6Gm67 t if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
IJ!]1fXy+ hCallWnd[index]=NULL;
1iS9f~ HotKey[index]=0;
6#T?g7\pyR HotKeyMask[index]=0;
<89@k(\ / bRemoved=TRUE;
BnvUPDT& KeyCount--;
GC66n1- X break;
kF3 EJ }
*U.$=4Az }
twz }
daaUC return bRemoved;
}U7>_b2 }
_bqiS]: +'>N]|Z g,Kb9[' DLL中的钩子函数如下:
+1Si>I $1H?k LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[T"oqO4%] {
' :g8a=L BOOL bProcessed=FALSE;
}1TfKS]m> if(HC_ACTION==nCode)
9r+ `j {
yZHQql%J
O if((lParam&0xc0000000)==0xc0000000){// 有键松开
c[!e*n!y switch(wParam)
q\O'r[&V {
KZ ?<&x case VK_MENU:
&|%z!x6 f MaskBits&=~ALTBIT;
6'(5pt break;
si=/=h case VK_CONTROL:
$Pzvv`f* MaskBits&=~CTRLBIT;
*{Wh-bc break;
TnL%_!V! case VK_SHIFT:
YM3oqS D MaskBits&=~SHIFTBIT;
]WN{8 break;
[H0jDbN default: //judge the key and send message
o1Mb HBb break;
1)#<nk)I }
BRQ9kK20 for(int index=0;index<MAX_KEY;index++){
dulW!&*No if(hCallWnd[index]==NULL)
1:My8 continue;
>gFF>L> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
F5:*;E;$ {
i.cSD%* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
jA=uK6m bProcessed=TRUE;
Q+E%"`3V4l }
6|3$43J,F }
oop''6`C% }
iIu else if((lParam&0xc000ffff)==1){ //有键按下
L,0HX switch(wParam)
vRYQ4B4o {
XX",&cp02V case VK_MENU:
Y[9x\6
_E MaskBits|=ALTBIT;
?V%x94B break;
]Qe;+p9vU case VK_CONTROL:
?J,hv'L] MaskBits|=CTRLBIT;
|i5A
F\w break;
a02;Zl case VK_SHIFT:
g4_DEBh MaskBits|=SHIFTBIT;
$A)i}M;uK break;
y%
=nhV default: //judge the key and send message
f m.-*`ax break;
o0^'xVv }
$+)2CXQe5 for(int index=0;index<MAX_KEY;index++){
4]RGLN if(hCallWnd[index]==NULL)
"TA r\;[ continue;
:\x53-&hO4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\2)a.2mAz {
1tU}}l SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
pXPwn( bProcessed=TRUE;
6T0E'kv
S }
x; 89lHy@e }
X*VHi }
{X<mr~ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
ao>bnRXR for(int index=0;index<MAX_KEY;index++){
Dp!3uR']p if(hCallWnd[index]==NULL)
*`[dC,+`. continue;
\9dSI if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
lg1yj}br SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
m{Jo'*%8f //lParam的意义可看MSDN中WM_KEYDOWN部分
Lzu;"#pw }
EU.vw0}u8 }
tJo,^fdfv }
EL$"MT}p return CallNextHookEx( hHook, nCode, wParam, lParam );
T1m'+^?" }
3/mVdU?U p*)RP2 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:
6rP[*0[ ^^QW< BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
a(&!{Y1bt BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
XbdoTriE lob{{AB,! 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:
JCZ"#8M3 R?!xO-^t LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
68?oV)fE {
"|w..%Wc if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
BFmYbK {
J8I_tF6 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
dP[l$/ SaveBmp();
AEaT return FALSE;
Z)Y--`*
}
r1&b#r>
…… //其它处理及默认处理
A,D67G<v` }
jV)!9+H# z)"7qqA f)hs>F 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。
WLGx=
; %\#s@8=2u 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。
|g]TWKc* T677d.zaT 二、编程步骤
R<
@o]p S@]7
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";
6He 7A@Eh z52T"uW 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
GgkljF@{} 3`_jNPV1 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;
E< nXkqD "8|y 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;
Kd^{~Wlz&z H6?ZE 5、 添加代码,编译运行程序。
Bmuf[-}QW JPL8fX-w 三、程序代码
p%e!&:! ?6.vd]oNO ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
jq(3y|6, #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
o~!4& #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Xm`s=5% #if _MSC_VER > 1000
O @fX
+W?U #pragma once
,t5X'sY L #endif // _MSC_VER > 1000
3N6U6.Tqb #ifndef __AFXWIN_H__
;:1d<Q| #error include 'stdafx.h' before including this file for PCH
P{mV #endif
-'+|r] #include "resource.h" // main symbols
Im%|9g;P class CHookApp : public CWinApp
VpSk.WY/ e {
AfW63;kH public:
=BJ/ZM CHookApp();
1)
V,>)Ak // Overrides
}/BwFB+(/ // ClassWizard generated virtual function overrides
YfUdpa0 //{{AFX_VIRTUAL(CHookApp)
cAC2Xq public:
,
RfU1R virtual BOOL InitInstance();
ep<A d virtual int ExitInstance();
u.iFlU //}}AFX_VIRTUAL
x-+[gNc
6 //{{AFX_MSG(CHookApp)
2#&9qGR // NOTE - the ClassWizard will add and remove member functions here.
E
}|g3 // DO NOT EDIT what you see in these blocks of generated code !
`*PVFm> //}}AFX_MSG
p%Ae"#_X% DECLARE_MESSAGE_MAP()
Dr6"~5~9w };
xjOy3_Js LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
[bkMl+:/HG BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
T_ Q/KhLU BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JbzYr]k BOOL InitHotkey();
(FZL> BOOL UnInit();
mH*42XC* #endif
*2crhI*@> uoFH{.) //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
l)D18 #include "stdafx.h"
M]!\X6<_ #include "hook.h"
AC ,$(E #include <windowsx.h>
mJewUc!<5 #ifdef _DEBUG
tp$NT.z #define new DEBUG_NEW
!.iu_xJ #undef THIS_FILE
]7zDdI|
static char THIS_FILE[] = __FILE__;
* b>W #endif
N J:]jd #define MAX_KEY 100
+xRja(d6 #define CTRLBIT 0x04
^te9f%>$l #define ALTBIT 0x02
2N)=fBF%- #define SHIFTBIT 0x01
=sedkrM #pragma data_seg("shareddata")
MUz.-YRt HHOOK hHook =NULL;
R+lKQAyC0= UINT nHookCount =0;
0sVCTJ@ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
1Y@6oT static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
oe`oUnN static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
<;#d*&] static int KeyCount =0;
N::_JH?^= static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
g]iWD;61 #pragma data_seg()
KQ?E]}rZ HINSTANCE hins;
~FH''}3:3 void VerifyWindow();
kP%'{ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:<gmgI //{{AFX_MSG_MAP(CHookApp)
8^p/?R^bu // NOTE - the ClassWizard will add and remove mapping macros here.
GhLgV // DO NOT EDIT what you see in these blocks of generated code!
-x3QgDno //}}AFX_MSG_MAP
82Nh;5Tr END_MESSAGE_MAP()
W5$jIQ}Bw wke$ CHookApp::CHookApp()
:g'"*VXYB {
m^U\l9LE // TODO: add construction code here,
RoM'+1nP:# // Place all significant initialization in InitInstance
PmvTCfsg }
INW8Q`[F Sl^HMO CHookApp theApp;
Y1{6lhxgE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
&xr?yd {
g Gg8O? Z BOOL bProcessed=FALSE;
gsc/IUk if(HC_ACTION==nCode)
CeR4's7 {
VyCBJK if((lParam&0xc0000000)==0xc0000000){// Key up
+F&w~UT switch(wParam)
]. 1[H~5N {
X)fj& case VK_MENU:
D!J
("~[3 MaskBits&=~ALTBIT;
tAP~ break;
W=mh*G3y case VK_CONTROL:
(8@._ MaskBits&=~CTRLBIT;
T$GhE break;
@]WN|K case VK_SHIFT:
n1DD+@ MaskBits&=~SHIFTBIT;
:uZcN break;
JmWN/mx default: //judge the key and send message
5Tb93Q@c break;
O9=vz% }
rxIfatp^ for(int index=0;index<MAX_KEY;index++){
m$*dPje if(hCallWnd[index]==NULL)
"^zxq5u continue;
/JtKn*?}:> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PS`v3|d}}} {
~(-B%Az SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`WC~cb\ bProcessed=TRUE;
9w}A7(' }
ZR6KE_ }
n_)d4d zl }
Ts|&_| else if((lParam&0xc000ffff)==1){ //Key down
N02N
w(pi switch(wParam)
<{9E.6G`n {
NL0X =i case VK_MENU:
"[BuQ0(g MaskBits|=ALTBIT;
fE|([` ! break;
2y,NT|jp case VK_CONTROL:
#8%Lc3n MaskBits|=CTRLBIT;
[FAoC3 k-h break;
D/9&pRsO case VK_SHIFT:
W _yVVr MaskBits|=SHIFTBIT;
Y2yVl+ break;
@PU%BKe default: //judge the key and send message
$0AN5 |`g\ break;
*'QD!Tc }
PE]jYyyHtU for(int index=0;index<MAX_KEY;index++)
G3OqRH {
SH<Nt[8C if(hCallWnd[index]==NULL)
X@\rg}kP continue;
]gQgNn? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oZmni9*SD {
{&4+W=0
n SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_Sosw|A bProcessed=TRUE;
w6qx }
/V2Ih }
R8W{[@ }
DdN{=}A if(!bProcessed){
3(}W=oI for(int index=0;index<MAX_KEY;index++){
rMH\;\
I|U if(hCallWnd[index]==NULL)
aHXd1\6m continue;
{}s7q|$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
]pzf{8% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
* A@~!@XE4 }
38tRb"3zP }
Pn[-{nz }
DKPX_:: return CallNextHookEx( hHook, nCode, wParam, lParam );
!eMz;GZ }
`&LPqb <2fZYt vt BOOL InitHotkey()
!.?2zp~ {
_Q t if(hHook!=NULL){
] L"jt8E nHookCount++;
,j:`yB]4, return TRUE;
q3z<v:=1y }
f1rP+l-C< else
S4n\<+dR< hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
$>hPB[ [ if(hHook!=NULL)
J2f}{! b+I nHookCount++;
+g(>]!swb return (hHook!=NULL);
(oBvpFP33 }
3,8<5)ds* BOOL UnInit()
F/tGk9v {
)>QpR8
G- if(nHookCount>1){
\uQ yp*P1s nHookCount--;
|C301ENZ return TRUE;
7y5`YJ}! }
$nUhM|It BOOL unhooked = UnhookWindowsHookEx(hHook);
SP?~i@H if(unhooked==TRUE){
M4w,J2_8MK nHookCount=0;
mSm:>hBd hHook=NULL;
T`mG+"O }
V^;2u return unhooked;
}F!tM"X\ }
v*iD)k:|t
e{EKM4 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
&b'IYoe {
XD%@Y~>+ BOOL bAdded=FALSE;
4
3V{q for(int index=0;index<MAX_KEY;index++){
|J-Osi if(hCallWnd[index]==0){
i/E"E7 hCallWnd[index]=hWnd;
lHerEv<ja HotKey[index]=cKey;
^ >JAl<k HotKeyMask[index]=cMask;
fUx;_GX?
bAdded=TRUE;
f8 E,.$> KeyCount++;
?*cr|G$r[ break;
3V=wW{;x }
%;/?DQU }
Nk?eVJ) return bAdded;
cZC%W!pT }
)
rw!. )
RT`.S
uN BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
xKl\:}Ytp {
O:%s;p
5 BOOL bRemoved=FALSE;
#djby}hi for(int index=0;index<MAX_KEY;index++){
g?B4b7II if(hCallWnd[index]==hWnd){
0OCmyy if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~H`m"4zQ hCallWnd[index]=NULL;
F3nYMf HotKey[index]=0;
\.ukZqB3
0 HotKeyMask[index]=0;
rf?%- X(V bRemoved=TRUE;
AS4mJ UU9 KeyCount--;
>|zMN$: break;
K}|zKTh:? }
w3Lr~_j }
f[}(E }
W{Uz#o
return bRemoved;
q"(b}3 }
6a} B SH2Kq void VerifyWindow()
Ef @ {
9]C%2!Ur, for(int i=0;i<MAX_KEY;i++){
hk+8s\%- if(hCallWnd
!=NULL){ or,:5Z
if(!IsWindow(hCallWnd)){ )_n=it$
hCallWnd=NULL; \)$:
HotKey=0; y>^FKN/
HotKeyMask=0; tn{YIp
KeyCount--; rMWJ
} TB}6iIe
} `%A vn<
} XEegUTs
} %u}#|+8}
GJ5R <f9I
BOOL CHookApp::InitInstance() Upa F>,kM
{ po\(O8#5U
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Gg e X
hins=AfxGetInstanceHandle(); (/7b8)g
InitHotkey(); !He_f-eZ
return CWinApp::InitInstance(); Nj;5iy
} 3{)!T;W d
=MU(!`
int CHookApp::ExitInstance() \sz*M
B
{ 3n,jrX75u
VerifyWindow(); 8eVy*h2:=
UnInit(); AL !ppi
return CWinApp::ExitInstance(); /!?b&N/d)
} 7KesfH?
Fr~\ZL
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7Kf
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z`_x|cU?J
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -Uan.#~S
#if _MSC_VER > 1000 +e^CL#Gs
#pragma once 2?Y8hm
#endif // _MSC_VER > 1000 9wlp
AK
&gJ1*"$9
class CCaptureDlg : public CDialog eC"k-a8j+
{ ",l6-<s
// Construction iX o(
public: Llkh
kq_
BOOL bTray; SwsJ<Dq^z
BOOL bRegistered; uh2 Fr
BOOL RegisterHotkey(); p>,D F9W`
UCHAR cKey; -oUGmV_
UCHAR cMask; p5jR;nOZ%l
void DeleteIcon(); X- tw)
void AddIcon(); )RN3Oz@H
UINT nCount; [[HCP8Wk
void SaveBmp(); ,,H;2xYf
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [O<F `u"a
// Dialog Data Mq#m;v$E
//{{AFX_DATA(CCaptureDlg) %%F,G
enum { IDD = IDD_CAPTURE_DIALOG }; qdLzB
CComboBox m_Key; je@&|9h
BOOL m_bControl; BYu(a
BOOL m_bAlt; s>:gL,%c
BOOL m_bShift; e/cHH34
CString m_Path; V@]SKbK}wN
CString m_Number; :-O$rm
//}}AFX_DATA u(FOSmNkN
// ClassWizard generated virtual function overrides (u^8=#
//{{AFX_VIRTUAL(CCaptureDlg) YO-B|f
public: yKuZJXGVo
virtual BOOL PreTranslateMessage(MSG* pMsg); c0Bqm
protected: +_ /ys!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )sW!s3>S>
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %19~9Tw
//}}AFX_VIRTUAL iZ>P>x\
// Implementation jI'?7@32`
protected: +pq)
7
HICON m_hIcon; kkfBVmuW
// Generated message map functions W4$aX5ow$
//{{AFX_MSG(CCaptureDlg) >?OUs>}3y2
virtual BOOL OnInitDialog(); Op8Gj
`
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p+<qI~
afx_msg void OnPaint(); Y[vP]7-
afx_msg HCURSOR OnQueryDragIcon(); X3 1%T"
virtual void OnCancel(); jJw
afx_msg void OnAbout(); cLp_\\
afx_msg void OnBrowse(); 2q]ZI
afx_msg void OnChange(); 9od c :
//}}AFX_MSG 4W|cIcU
W
DECLARE_MESSAGE_MAP() 8\9W:D@"x
}; kP}l"CN4
#endif 0LXu!iix
7XT(n v
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Q=d:Yz":S
#include "stdafx.h" %
>a
/m.$
#include "Capture.h" V~#5^PF{
#include "CaptureDlg.h" :Cezk D&
#include <windowsx.h> `jR8RDD
#pragma comment(lib,"hook.lib") \D'mo
#ifdef _DEBUG @`+\vmfD
#define new DEBUG_NEW X^dasU{*
#undef THIS_FILE 6W
static char THIS_FILE[] = __FILE__; Nt_sV7zzb
#endif A$7K5
#define IDM_SHELL WM_USER+1 d&L
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S&-F(#CF^
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Xjxa
2D
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; uPbdzUk$
class CAboutDlg : public CDialog `KLr!<i()
{ TD*AFR3Oz
public: : O@(Sv
CAboutDlg(); p
%.Adxx
// Dialog Data -6WSYpHV
//{{AFX_DATA(CAboutDlg) ]b>XN8y.
enum { IDD = IDD_ABOUTBOX }; )(yaX
//}}AFX_DATA x5xMr.vm
// ClassWizard generated virtual function overrides ,SIGfd
//{{AFX_VIRTUAL(CAboutDlg) Z_dL@\#|
protected: ^\ln8!;
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZU0*iA
//}}AFX_VIRTUAL Vv5T(~
// Implementation G9xO>Xp^Al
protected: +:jv )4^O
//{{AFX_MSG(CAboutDlg) 0~_I9|FN
//}}AFX_MSG a%a0/!U[
DECLARE_MESSAGE_MAP() AqQ5L>:Gq
}; 7LM&3mA<
v9,cL.0&
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gaNe\
{ (4RtoYWW
//{{AFX_DATA_INIT(CAboutDlg) -Jv3D$f]a
//}}AFX_DATA_INIT IY[qWs
} N}[!QE
|{-?OOKj
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D+
.vg?8
{ GV) "[O
CDialog::DoDataExchange(pDX); MQcIH2
//{{AFX_DATA_MAP(CAboutDlg) &}C-W*
f,Z
//}}AFX_DATA_MAP ]oz >/\!
} 0*kS\R=P
z{PPPFk4J
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;gu4~LQw
//{{AFX_MSG_MAP(CAboutDlg) D%?9[Qb
// No message handlers 9m_~Zs}Z
//}}AFX_MSG_MAP 2'OY,Ooe
END_MESSAGE_MAP() #u+qV!4
g2^{+,/^K
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %[~g84@
: CDialog(CCaptureDlg::IDD, pParent) W?!rqo2SP
{ </5
//{{AFX_DATA_INIT(CCaptureDlg) m:~y:.
m_bControl = FALSE; }wBpBw2J
m_bAlt = FALSE; /zQx}U)TP
m_bShift = FALSE; P*%P"g
m_Path = _T("c:\\"); u0)9IZxc
m_Number = _T("0 picture captured."); U7g,@/Qx
nCount=0; 3fX_XH1Q
bRegistered=FALSE; *}Gys/\!S
bTray=FALSE; XhWo~zh"
//}}AFX_DATA_INIT <-G3Qgm
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5&_")k3$*
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pXBh^
} eLgq
)
v_v>gPl,
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pStbj`Eq
{ L\bcR
CDialog::DoDataExchange(pDX); 9H:J&'Xi7
//{{AFX_DATA_MAP(CCaptureDlg) #D?w,<_8,
DDX_Control(pDX, IDC_KEY, m_Key); 8r@GoG>
DDX_Check(pDX, IDC_CONTROL, m_bControl); 2~ETu&R:
DDX_Check(pDX, IDC_ALT, m_bAlt); >o&%via}
DDX_Check(pDX, IDC_SHIFT, m_bShift); 1P'L<z
DDX_Text(pDX, IDC_PATH, m_Path); $nIE;idk
DDX_Text(pDX, IDC_NUMBER, m_Number); 8WpNlB+:{
//}}AFX_DATA_MAP vo)W
ziHh
} nox-)e
N:#$S$
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MY z!zI
//{{AFX_MSG_MAP(CCaptureDlg) :ec>[N~KG
ON_WM_SYSCOMMAND() i& %dwqp
ON_WM_PAINT() k
7@:e$7
ON_WM_QUERYDRAGICON() ,VUOsNN4\
ON_BN_CLICKED(ID_ABOUT, OnAbout) -?{g{6
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) u$ci{<
ON_BN_CLICKED(ID_CHANGE, OnChange) 2VX9FDrnk
//}}AFX_MSG_MAP {9j0k`A
END_MESSAGE_MAP() $rbr&TJ
Ky8,HdAq
BOOL CCaptureDlg::OnInitDialog() RX^8`}N
{ ^ u0y<kItX
CDialog::OnInitDialog(); g1 y@z8Z{
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OS>%pgv
ASSERT(IDM_ABOUTBOX < 0xF000); 87)/dHc
CMenu* pSysMenu = GetSystemMenu(FALSE); j
b'M
if (pSysMenu != NULL) e8xNZG;
{ \S?-[v*{
CString strAboutMenu; ~-%z:Re'_
strAboutMenu.LoadString(IDS_ABOUTBOX); $DnJ/hg;qD
if (!strAboutMenu.IsEmpty()) asy:[r"
{ o~4kJW#
pSysMenu->AppendMenu(MF_SEPARATOR); <1x u&Z7
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [x`),3qD
} >>y\idg&:
} 8)Vl2z
SetIcon(m_hIcon, TRUE); // Set big icon =0;njL(7;
SetIcon(m_hIcon, FALSE); // Set small icon ^)| tf\4
m_Key.SetCurSel(0); 6-5{7E}/b
RegisterHotkey(); ={6vShG)m
CMenu* pMenu=GetSystemMenu(FALSE); J5Q.v;
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]1h9:PF
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); H3iYE~^#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); q8GCO\(
return TRUE; // return TRUE unless you set the focus to a control 9 *v14c%
} h{jm
>*+n`"6
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c2s73iz
{ hX-^h2eV
if ((nID & 0xFFF0) == IDM_ABOUTBOX) +OSSgY$
{ 8LuU2Lo
CAboutDlg dlgAbout; N?A}WW#
dlgAbout.DoModal(); 6vU%Y_n=y]
} !#
xi^I
else /P/0\3TCi
{ =*6H!bzX
CDialog::OnSysCommand(nID, lParam); s~5rP:
} ;xai JJK{
} n-dC!t
IRv/[|"L
void CCaptureDlg::OnPaint() +lf`Dd3
{ K&-uW _0
if (IsIconic()) ]2@lyG#<<
{ R"z}q(O:
CPaintDC dc(this); // device context for painting AJ#YjkO>]
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $o)}@TC
// Center icon in client rectangle 3_{rXtT)'
int cxIcon = GetSystemMetrics(SM_CXICON); I}}>M#
int cyIcon = GetSystemMetrics(SM_CYICON); x69RQ+Vw
CRect rect; md/h\o&
GetClientRect(&rect); f&Juq8s_0
int x = (rect.Width() - cxIcon + 1) / 2; ClPE_Cfw~
int y = (rect.Height() - cyIcon + 1) / 2; B_3N:K Y
9
// Draw the icon @FRas00)|
dc.DrawIcon(x, y, m_hIcon); QUz4 Kt
} =66'33l2
else "5\6`\/
{ }+)q/]%
CDialog::OnPaint(); |`AJP
}
C +Wa(K
} D'UIxc8
:"K9(XKKU
HCURSOR CCaptureDlg::OnQueryDragIcon() ?MSV3uODb
{ &hM7y7
return (HCURSOR) m_hIcon; vI"BNC*Q1
} #aE>-81SS&
"_+8z_
void CCaptureDlg::OnCancel() A5s;<d0
{ e=[@HVr
if(bTray) m:9|5W
DeleteIcon(); (L W2S;-
CDialog::OnCancel(); 12tAx3p
} /3;]e3x
/.t1Ow
void CCaptureDlg::OnAbout() +Ur75YPh
{ \[AJWyP
CAboutDlg dlg; g6OPYUPg
dlg.DoModal(); ^SIA%S3
} 34J*<B[Njo
NLt"yD3t
void CCaptureDlg::OnBrowse() u Vo"_c w
{ vPrlRG6
CString str; *rYPjk6g[
BROWSEINFO bi; @=BApuer+
char name[MAX_PATH]; z0|-OCmL
ZeroMemory(&bi,sizeof(BROWSEINFO)); VU+=b+B~m
bi.hwndOwner=GetSafeHwnd(); PE?ICou
bi.pszDisplayName=name; j-| !QlB
bi.lpszTitle="Select folder"; Bc'Mj=>;
bi.ulFlags=BIF_RETURNONLYFSDIRS; TQQh:y
LPITEMIDLIST idl=SHBrowseForFolder(&bi); FRsp?i
K)
if(idl==NULL) fk\]wFj
return; NIp]n[=.q
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @c).&7
str.ReleaseBuffer(); N7_(,Gu*R
m_Path=str; vTC{
if(str.GetAt(str.GetLength()-1)!='\\') p!\GJ a",
m_Path+="\\"; J.]`l\
UpdateData(FALSE); $Xqc'4YOZ
} C(M ?$s`
U6YHq2<
void CCaptureDlg::SaveBmp() uXb}oUC
{ }#&L
CDC dc; PO,zP9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); _`,ZI{.J^
CBitmap bm; u~~ ~@p
int Width=GetSystemMetrics(SM_CXSCREEN); (B03f$8}*_
int Height=GetSystemMetrics(SM_CYSCREEN); ]2A2<Q_,
bm.CreateCompatibleBitmap(&dc,Width,Height); >'jkL5l
CDC tdc; >4os%T
tdc.CreateCompatibleDC(&dc); v@{VQVx
CBitmap*pOld=tdc.SelectObject(&bm); N:%Nq8I}:
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); CY$
1;/
tdc.SelectObject(pOld); HYv-5:B
BITMAP btm; Hoi~(Vc.
bm.GetBitmap(&btm); {Q@?CT
DWORD size=btm.bmWidthBytes*btm.bmHeight; \C{Zqo,
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); TV`sqKW
BITMAPINFOHEADER bih; }ktK*4<k
bih.biBitCount=btm.bmBitsPixel; i`?yi-R&
bih.biClrImportant=0; Bm<tCN-4
bih.biClrUsed=0; '}-QZ$|*
bih.biCompression=0; {Z178sik
bih.biHeight=btm.bmHeight; ;Eh"]V,e
bih.biPlanes=1; 6P)D M
bih.biSize=sizeof(BITMAPINFOHEADER); fUZCP*7>
bih.biSizeImage=size; {aUv>T"c
bih.biWidth=btm.bmWidth; qxYCT$1
bih.biXPelsPerMeter=0; ;Zn&Nc7
bih.biYPelsPerMeter=0; OF:0jOW
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); MM( ,D&
Z
static int filecount=0; x'SIHV4M@Q
CString name; fA=Lb^,M
name.Format("pict%04d.bmp",filecount++); '{cFr
name=m_Path+name; <N3~X,ch
BITMAPFILEHEADER bfh; 5r dt
bfh.bfReserved1=bfh.bfReserved2=0; ngk:q5Tp
bfh.bfType=((WORD)('M'<< 8)|'B'); f"^t~q[VS
bfh.bfSize=54+size; 'Zqt~5=5
bfh.bfOffBits=54; N
x^JC_
CFile bf; e)3Mg^
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ uLNOhgSUf
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %=V"
}P[
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k?/! `
bf.WriteHuge(lpData,size); Yq:/dpA_
bf.Close(); /nEK|.j
nCount++; tCGA3t
} A;f)`i0l,
GlobalFreePtr(lpData); yA7O<p+
if(nCount==1) )QmmI[,tq
m_Number.Format("%d picture captured.",nCount); a
FWTm,)
else )*7{%Ilq
m_Number.Format("%d pictures captured.",nCount); XjYMp3
UpdateData(FALSE); =PnNett}a
} ;6?,Yhk$h
y5VohVa`
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y{XNB}E
{ %{me<\(
if(pMsg -> message == WM_KEYDOWN) |C,]-mJ G
{ gLx?0eBBA
if(pMsg -> wParam == VK_ESCAPE) 0/cgOP!^
return TRUE; W&m3"~BJ
if(pMsg -> wParam == VK_RETURN) vi[~Qt
return TRUE; .dvs&+I
} ol`q7i.
return CDialog::PreTranslateMessage(pMsg); Ad-_=a%
} $lJ!f
Lf{pTxKr
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |@?='E?h
{ LOgB_$9_3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e0#{'_C
SaveBmp(); ol_&epG;ST
return FALSE; a&`^M
} 7mb5z/N
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ RaC6RH
CMenu pop; Ysi@wK-LnF
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lHu/pSu@k
CMenu*pMenu=pop.GetSubMenu(0); s GrI%3[e"
pMenu->SetDefaultItem(ID_EXITICON); c{T)31ldW
CPoint pt; aQso<oK
GetCursorPos(&pt); f_:>36{1^!
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~{6}SXp4U
if(id==ID_EXITICON) 9YBlMf`KEf
DeleteIcon(); +ERuZc$3,
else if(id==ID_EXIT) }5X.*wz
OnCancel(); F<)f&<5E-
return FALSE; 2J`LZS
} W5&KmA
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;[|+tO_
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |J^I8gx+
AddIcon(); Wx8;+!2Q/
return res; (k%r_O 6
} X0KUnxw
4&~*;an7
void CCaptureDlg::AddIcon() HZ\=NDz
{ vE~<R
NOTIFYICONDATA data; A}1:fw\Fn3
data.cbSize=sizeof(NOTIFYICONDATA); G2J4N2hu
CString tip; eBe5H
=I@
tip.LoadString(IDS_ICONTIP); K%/g!t)
data.hIcon=GetIcon(0); ay=f1<a
data.hWnd=GetSafeHwnd(); {_4zm&
strcpy(data.szTip,tip); ulk yP
data.uCallbackMessage=IDM_SHELL; ,w_C~XN$t
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; v)'Uoe"R%
data.uID=98; J!zL)u|
Shell_NotifyIcon(NIM_ADD,&data); o6r
^
ShowWindow(SW_HIDE); qPCI@5n3T?
bTray=TRUE; hud'@O"R+
} e4cWi
z'EphL7r
void CCaptureDlg::DeleteIcon() "K*^%{
{ lq27^K
NOTIFYICONDATA data; :NWrbfz
data.cbSize=sizeof(NOTIFYICONDATA); ]T>YYz
data.hWnd=GetSafeHwnd(); QFEc?sEe
data.uID=98; T{ /\q 5
Shell_NotifyIcon(NIM_DELETE,&data); 0-U%R)Q
ShowWindow(SW_SHOW); !(N,tZ
SetForegroundWindow(); M,P:<-J
ShowWindow(SW_SHOWNORMAL); %#7^b=;=
bTray=FALSE; 0a)LZp|
} mmEe@-lE
o31pF
void CCaptureDlg::OnChange() |C\XU5}
{ ;3sJ7%`v
RegisterHotkey(); ~"vRH
} Fi#b0S
A#w*r-P
BOOL CCaptureDlg::RegisterHotkey() \J{%xW>
{ y1Yrf,E
m=
UpdateData(); gUv`G
UCHAR mask=0; 0 oHnam
UCHAR key=0; Uj~
:|?Wz
if(m_bControl) k#/%#rQM
mask|=4; ZRoOdo94
if(m_bAlt) \H.1I=<
mask|=2; 4m/L5W:K
if(m_bShift) 'FGf#l<
mask|=1; :6,qp?/
key=Key_Table[m_Key.GetCurSel()]; ~7N>tjB
if(bRegistered){ CoZXbTq
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5]Wkk~a
bRegistered=FALSE; 2n9E:tc
} qJ;T$W=NG
cMask=mask; \2rCT~x
cKey=key; HxC_nh
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oEqt7l[I{
return bRegistered; lS`hJ:
} Pd:tRY+t/
2QHu8mFU
四、小结 ,vi6<C\
W[!bF'-10
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。