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:
}&Wp3EWw
Z^'?|qFj! 一、实现方法
vgh^fa!/ j.=UI-&m 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:
|<j,Tr1[ 08Pt(kzNA #pragma data_seg("shareddata")
,Lt~u_ lve HHOOK hHook =NULL; //钩子句柄
.g/ARwM} UINT nHookCount =0; //挂接的程序数目
[]A"]p static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
]k::J>84 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
?AeHVQ
:C static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
PwFQ #Z static int KeyCount =0;
zp7V\W;
& static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Sc;iAi
( #pragma data_seg()
Ie G7@ _DPB?)!x 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。
b(PHZCy# 9SRfjS{7 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:
u(V [K/O5_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
NCowt|#t cKey,UCHAR cMask)
YVQ_tCC_! {
la
G$v-r BOOL bAdded=FALSE;
RLYU\@kK? for(int index=0;index<MAX_KEY;index++){
18DTv6?QG if(hCallWnd[index]==0){
M>*0r<qn hCallWnd[index]=hWnd;
E;6Y? vJ HotKey[index]=cKey;
~-XOvKJb HotKeyMask[index]=cMask;
YMc8Q\*B bAdded=TRUE;
X+]L-o6I2 KeyCount++;
rao</jN.9 break;
?1GY%- }
^lHb&\X }
1fz*SIjG return bAdded;
Qqd6.F }
pP|,7c5 //删除热键
UJee&4C-y BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
l^DINZU@ {
(Oxz'#TX BOOL bRemoved=FALSE;
A[u)wX^`f^ for(int index=0;index<MAX_KEY;index++){
Vk MinE if(hCallWnd[index]==hWnd){
l,*yEkU if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
JP{UgcaF hCallWnd[index]=NULL;
5SoZ$,a<e HotKey[index]=0;
NoFs-GGGh HotKeyMask[index]=0;
dO>k5!ge|: bRemoved=TRUE;
<Vz<{W3t KeyCount--;
pyUNRqp break;
iBG`43; }
1 L+=|*: }
a{<p'_ }
>Y7r\ return bRemoved;
ybo#K }
YniZ(
~^K `^v4zWDK
S304ncS|M DLL中的钩子函数如下:
u9TzZ lp,\]] LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
RY9+ 9i {
v#RW{kI BOOL bProcessed=FALSE;
285_|!.Y if(HC_ACTION==nCode)
/SnynZ.q {
mgy"|\] if((lParam&0xc0000000)==0xc0000000){// 有键松开
{F'Az1^I= switch(wParam)
1a<]$tZk {
J__;.rnk case VK_MENU:
ykxbX MaskBits&=~ALTBIT;
,VPbUo@ break;
+p13xc?#j case VK_CONTROL:
'I&|1I^ MaskBits&=~CTRLBIT;
,`;jvY~Ec break;
RS'} nY} case VK_SHIFT:
HR;/Br MaskBits&=~SHIFTBIT;
1s Br.+p break;
D+f'*| default: //judge the key and send message
o:_^gJ+| break;
sT)6nV }
vT?Q^PTO for(int index=0;index<MAX_KEY;index++){
.
3GnZR,L if(hCallWnd[index]==NULL)
}c}
( 5 continue;
Yx6hA#7I if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]\OWZ{T'j {
W@l+ciZ_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3@&bxYXm bProcessed=TRUE;
#;d)? }
|</"N-#S }
s0r"N7~ }
([Ebsj else if((lParam&0xc000ffff)==1){ //有键按下
fGb7=Fk switch(wParam)
I[ai: {
Z)/6??/R case VK_MENU:
Kaf> MaskBits|=ALTBIT;
`8,w[o oC2 break;
=K:(&6f<t case VK_CONTROL:
\ZS\i4 MaskBits|=CTRLBIT;
[!G)$< break;
4RhR[ case VK_SHIFT:
*9J1$Wa MaskBits|=SHIFTBIT;
hL0]R,t;' break;
!L77y^oV default: //judge the key and send message
z/S,+!|z break;
kGm:VYf% }
R8tF/dx>7 for(int index=0;index<MAX_KEY;index++){
.Y! :x=e if(hCallWnd[index]==NULL)
K'NcTw#f continue;
aM), M]m[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W}>=JoN^J {
i`+B4I8[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,*dzJT$k bProcessed=TRUE;
F+Z2U/'a }
gA_krK,Z }
vVAb'`ysv }
yIOLs}!SF if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
U h.Sc:trA for(int index=0;index<MAX_KEY;index++){
9mQ#L<Ps if(hCallWnd[index]==NULL)
vXb: continue;
$&IpX M] if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z5 Bi=~=# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_Fizgs //lParam的意义可看MSDN中WM_KEYDOWN部分
\83sSw }
"IG+V:{ou }
k^^:;OR }
+vz`go return CallNextHookEx( hHook, nCode, wParam, lParam );
7IW> >RBF }
{7X#4o0 =2,0Wo]$ 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:
"V3}t4 ,d|vP)SS BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Tw//!rpG BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
n>P!u71 Noh?^@T`Ov 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:
A:eG5K} _R7 w?!t8 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
?>V6P_r> {
Tr&E4e if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
+yWR#[`n {
RZO5=L9E //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Sj)}qM-y# SaveBmp();
[Uli>/%JB return FALSE;
b{RqwV5P }
fYBH)E …… //其它处理及默认处理
~GG?GB }
Gy!P,a)z bD<qNqX$ }E; F)=E 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。
,- '4L9 6e .v&f7( 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。
[9V]On BDe]18X 二、编程步骤
C c*({ HR60 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";
`5'2Hg+ M$A#I51 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
&aPl`"j 7yI`e*EOD 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
dn,g Z"< =-~;OH/ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
cS|VJWgTZ (R'+jWH 5、 添加代码,编译运行程序。
Fk1.iRVzi ni6r{eSQ 三、程序代码
2yKz-"E sS!w}o2X ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
&[@\ f^~ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
:.iyR #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
g{>^`JtP #if _MSC_VER > 1000
5+P@sD #pragma once
H{V)g #endif // _MSC_VER > 1000
VXm[- #ifndef __AFXWIN_H__
h1+hds+ #error include 'stdafx.h' before including this file for PCH
7byCc_, #endif
->E=&X #include "resource.h" // main symbols
Ue$zH"w class CHookApp : public CWinApp
9s` /~ a@ {
Bux'hc public:
j7
d:v7+_ CHookApp();
J!h^egP // Overrides
<y)E>Fl // ClassWizard generated virtual function overrides
phP>3f.T //{{AFX_VIRTUAL(CHookApp)
ip``v0Nf public:
f vLC_'M virtual BOOL InitInstance();
+a|/l virtual int ExitInstance();
#Qbl=o4 //}}AFX_VIRTUAL
'#Dg8/r! //{{AFX_MSG(CHookApp)
&Un6ay // NOTE - the ClassWizard will add and remove member functions here.
PuXUuJx( // DO NOT EDIT what you see in these blocks of generated code !
:Q@)*kQH //}}AFX_MSG
aMK~1]Cx DECLARE_MESSAGE_MAP()
5H lWfD };
ksWSMxm LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
X=~V6m BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Ct]A%=cZW BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Y )b@0' BOOL InitHotkey();
ZPO|<uR BOOL UnInit();
DjHp+TyT #endif
8)xt(~qF 'iUg[{'+ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
feEMg #include "stdafx.h"
0^~\COa #include "hook.h"
SwH2$:f #include <windowsx.h>
f9TV%fG? #ifdef _DEBUG
& ,L9O U #define new DEBUG_NEW
xx8U$,Ng #undef THIS_FILE
_:J*Cm[q static char THIS_FILE[] = __FILE__;
?Zz'|.l@ #endif
[@"wd_f{l #define MAX_KEY 100
cxP6-tV% #define CTRLBIT 0x04
c
~Fdx #define ALTBIT 0x02
u&]vd / #define SHIFTBIT 0x01
N[U9d}Zv #pragma data_seg("shareddata")
x&=9P e( HHOOK hHook =NULL;
8#LJ* o UINT nHookCount =0;
~kKrDLW+ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
x#8w6@iPQ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
J]pa4C` static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
onte&Ed\ static int KeyCount =0;
)`HA:: static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
uDayBaR #pragma data_seg()
^O6*e]C$ HINSTANCE hins;
[-w@.^:]X void VerifyWindow();
v{;7LXy0 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
RL}KAGK //{{AFX_MSG_MAP(CHookApp)
YQ(Po!NI\' // NOTE - the ClassWizard will add and remove mapping macros here.
Z=+03 // DO NOT EDIT what you see in these blocks of generated code!
NZXjE$<Vr //}}AFX_MSG_MAP
cHD%{xlb END_MESSAGE_MAP()
"uD=KlA ?o[L7JI CHookApp::CHookApp()
lDc;__}Ws {
=_pwA:z"A // TODO: add construction code here,
r;qzo. // Place all significant initialization in InitInstance
1n%8j*bJq }
3qMNl>> / 8gL.i$ CHookApp theApp;
&35|16z%@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{'bip`U. {
7*+TP~WI BOOL bProcessed=FALSE;
\pY^^ l* if(HC_ACTION==nCode)
-50AX1h31: {
B0)]s<< if((lParam&0xc0000000)==0xc0000000){// Key up
`M@Ak2gcR+ switch(wParam)
Y2T$BJJ {
cF+ X,]=6 case VK_MENU:
'$m7ft} MaskBits&=~ALTBIT;
=-jD~rN4;P break;
N$ alUx* case VK_CONTROL:
Y=B3q8l5 MaskBits&=~CTRLBIT;
fA^Em)cs2 break;
8+'C_t/0i case VK_SHIFT:
\m/xV/ MaskBits&=~SHIFTBIT;
HKmcQM break;
(36K3=Q a default: //judge the key and send message
P-Su5F break;
2x}6\t }
/c-nE3+rn for(int index=0;index<MAX_KEY;index++){
TD,nIgH` if(hCallWnd[index]==NULL)
J|QiH< continue;
%mI~
=^za if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
JMyTwj[7 {
f3PMVf:< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
U;^[$Aq bProcessed=TRUE;
)0CQP }
H;KDZO9W }
1dG06<! }
B~gV'(9g else if((lParam&0xc000ffff)==1){ //Key down
Z<z;L<tJ 9 switch(wParam)
VOgi7\ {
OtUrGQP case VK_MENU:
(Mt5 P MaskBits|=ALTBIT;
7'w0 break;
Q/^A #l[ case VK_CONTROL:
_p}xZD\?, MaskBits|=CTRLBIT;
zFhgE*5 break;
#V_GOy1- case VK_SHIFT:
mJ MaskBits|=SHIFTBIT;
/iM$Tb5 break;
79Bg]~}Z default: //judge the key and send message
?y7w} W break;
Of7+/UV }
e<\<,)9@/ for(int index=0;index<MAX_KEY;index++)
|X (2Zv^O {
/Jlv"R1, if(hCallWnd[index]==NULL)
~1(j&&kXet continue;
t/p $ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ae`|ic {
UQ8bN I7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Omyt2`q bProcessed=TRUE;
1;r69e }
#MgvG, }
Vb4;-?s_ }
f}fsoDoQ= if(!bProcessed){
;!u;!F!i for(int index=0;index<MAX_KEY;index++){
Kn}ub+
"J if(hCallWnd[index]==NULL)
dbF M,"^ continue;
:Ml7G if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
`rFAZcEj% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
mP}#Ccji? }
wD9a#AgEd }
KS<Jv; }
xAdq+$>< return CallNextHookEx( hHook, nCode, wParam, lParam );
1(gfdx9|b }
mN}7H:, 6`e@$(dfA BOOL InitHotkey()
}vh Za p^ {
g1[&c+=U`P if(hHook!=NULL){
9K"JYJ
q2 nHookCount++;
>J>V%
7 return TRUE;
Fwfo2 }
80hme+e else
X;GfPw.m hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
M<`|CVl if(hHook!=NULL)
d ,F5:w& nHookCount++;
#@//7Bf% return (hHook!=NULL);
@u9Mks|{ }
XW~bu2%{7" BOOL UnInit()
/9 hR {
k
onoI&kV| if(nHookCount>1){
l(kr'x nHookCount--;
P:!)9/.2 return TRUE;
C7qYiSv }
's%q BOOL unhooked = UnhookWindowsHookEx(hHook);
CEtR[Cu if(unhooked==TRUE){
?y%t}C\W nHookCount=0;
4ke^*g
K< hHook=NULL;
8A2z 5Aa }
">90E^ return unhooked;
t1i(;|8| }
cf;Ht^M\ AtHS@p BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
* gqSWQ {
Pv){sYUh BOOL bAdded=FALSE;
q)I|2~Q c^ for(int index=0;index<MAX_KEY;index++){
hnxc`VX>g if(hCallWnd[index]==0){
ARB7>" hCallWnd[index]=hWnd;
"yh Pm HotKey[index]=cKey;
~"dhu]^ HotKeyMask[index]=cMask;
?J&)W,~ bAdded=TRUE;
RQ'
H!(K KeyCount++;
J=}F2C
break;
vXcy# }
7_)|I?
=0d }
ZF{~ih*^u return bAdded;
}T(z4P3 }
G\~^&BAC *xH\)|3, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)"u:ytK{ {
ME+em1ZH BOOL bRemoved=FALSE;
"JhimgwvY for(int index=0;index<MAX_KEY;index++){
F!g;A"?V if(hCallWnd[index]==hWnd){
(_+;R if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
|E^|X!+9 hCallWnd[index]=NULL;
]PX}b HotKey[index]=0;
\
P/W8{ HotKeyMask[index]=0;
T\sNtdF`: bRemoved=TRUE;
J!p<oW)a! KeyCount--;
0HibY[_PbD break;
BQNp$]5s }
`,#!C`E 9 }
oXGZK5w<l }
H5M#q6`H6 return bRemoved;
3H8Al }
)%j" `XMM1y>V9> void VerifyWindow()
T.Zz;2I {
n0fR u`SNV for(int i=0;i<MAX_KEY;i++){
J$[Q?8
ka if(hCallWnd
!=NULL){ m&El)
if(!IsWindow(hCallWnd)){ X;EJ&g/
hCallWnd=NULL; buYDl
HotKey=0; dY'Y5Th~
HotKeyMask=0; a%J/0'(d
KeyCount--; Y5%;p33uFG
} NMXM[Ukb
} 14l; *
} KH}t:m+h
} VS`Z_Xn
<\DUo0]J
BOOL CHookApp::InitInstance() v5 Y)al@
{ |- OHve4A
AFX_MANAGE_STATE(AfxGetStaticModuleState()); cU | _
hins=AfxGetInstanceHandle(); E .;io*0
InitHotkey(); EfSMFPM
return CWinApp::InitInstance(); ^
f{qJ[,
} V9{B}5KC
\=g!$
int CHookApp::ExitInstance() %ck`0JZAP
{ wAz,vq=x
VerifyWindow(); 78w4IICk
UnInit(); -\,VGudM}
return CWinApp::ExitInstance(); gKQ@!UU8
} +]L) >$6
Pd],}/ZG-
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8IOj[&%0
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B;c=eMw
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *vs~SzF$
#if _MSC_VER > 1000 3@HIpQM3
#pragma once Pz
{Ig
#endif // _MSC_VER > 1000 7'UWRRsxUF
Q)dT(Td9~
class CCaptureDlg : public CDialog %kW3hQ<$
{ qKs7WBRJy
// Construction 2'dG7lLu4
public: K#)bjxz
BOOL bTray; k4mTZ}6E
BOOL bRegistered; _z%\'(l+
BOOL RegisterHotkey(); rgn|24x
UCHAR cKey; {~1M
UCHAR cMask; ?,V;f2c
void DeleteIcon(); V*uEJ6T
void AddIcon(); ee\Gl?VN
UINT nCount; _w%s(dzk
void SaveBmp(); c#x7N9;"!
CCaptureDlg(CWnd* pParent = NULL); // standard constructor @`2ozi~lO
// Dialog Data ] - h|]
//{{AFX_DATA(CCaptureDlg) c}\
d5R_L
enum { IDD = IDD_CAPTURE_DIALOG }; 0gi}"v
CComboBox m_Key; F]SIT\kBm
BOOL m_bControl; 4^BLSK~(
BOOL m_bAlt; %Fm`Y.l
BOOL m_bShift; `#<eA*^g5
CString m_Path; 0k7"H]J
CString m_Number; J\GKqt;5@
//}}AFX_DATA U%Ol^xl
// ClassWizard generated virtual function overrides jL2MW(d^Q
//{{AFX_VIRTUAL(CCaptureDlg) T-!|l7V~f
public: pfNThMf
virtual BOOL PreTranslateMessage(MSG* pMsg); 1W7
iip,
protected: Qv=Bq{N
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?e2Y`0
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); l58l
//}}AFX_VIRTUAL [$H( CH`
// Implementation M'vXyb%$1
protected: LA>dkPB
HICON m_hIcon; 8ZzU^x
// Generated message map functions Qvs(Rt3?y
//{{AFX_MSG(CCaptureDlg) WT1q15U(=
virtual BOOL OnInitDialog(); *IVD/9/
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3XBp6`
afx_msg void OnPaint(); GMt)}Hz
afx_msg HCURSOR OnQueryDragIcon(); 7TR'zW2W
virtual void OnCancel(); ZS|Z98
afx_msg void OnAbout(); ,Zr YJ<
afx_msg void OnBrowse(); f`bIQ 9R
afx_msg void OnChange(); )/
n29]
//}}AFX_MSG 0-lPhnrp
DECLARE_MESSAGE_MAP() n*Q4G}p
}; W>VAbm
#endif >02i8:Tp5K
t2m ^
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s+Cl
#include "stdafx.h" ?WMi S]Q\
#include "Capture.h" _4!7
zW^
#include "CaptureDlg.h" B0NN>)h
#include <windowsx.h> #SK#k<&P
#pragma comment(lib,"hook.lib") U8U/?zW/&
#ifdef _DEBUG E^'C" 6
#define new DEBUG_NEW ^JiaR)#r
#undef THIS_FILE 18J.vcP
static char THIS_FILE[] = __FILE__; aB7d(
#endif _TV2)
#define IDM_SHELL WM_USER+1 upZYv~Sa
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); / *Ou$
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0 %C!`7
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; |ORmS&7
class CAboutDlg : public CDialog v] W1F,u
{ ~x9 W{B]
public: deHY8x5uI
CAboutDlg(); ysQEJm^|-u
// Dialog Data 8UjCX[v
//{{AFX_DATA(CAboutDlg) zvWO4\
enum { IDD = IDD_ABOUTBOX }; zS,%msT^A
//}}AFX_DATA Y!Usce
// ClassWizard generated virtual function overrides (0O`A~M3
//{{AFX_VIRTUAL(CAboutDlg) R4[. n@
protected: HFpjNR
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k
QB 1=c
//}}AFX_VIRTUAL *_}IeNc
// Implementation LS*{]@8q
protected: Sj,4=a
//{{AFX_MSG(CAboutDlg) m3h2/}%9`
//}}AFX_MSG 1"*Nb5s
DECLARE_MESSAGE_MAP() U1OLI]P
}; O1l4gduN|i
Q';\tGy
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5EVB27k
{ :XNK-A W
//{{AFX_DATA_INIT(CAboutDlg) 4'd;'SvF
//}}AFX_DATA_INIT }A)^XZ/
} +5N^TnBtBL
KzxW?Ji$S
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mkKRC;
{ ZA 99vO
CDialog::DoDataExchange(pDX); oX%PsS
//{{AFX_DATA_MAP(CAboutDlg) <VauJB*R
//}}AFX_DATA_MAP #S/pYP`7
} @$K![]oD
sPZV>Q:zY
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) IIYX|;1}X
//{{AFX_MSG_MAP(CAboutDlg) Q#d+IIR0gK
// No message handlers x`/m>~_
//}}AFX_MSG_MAP z|oA{VxW>
END_MESSAGE_MAP() <yX@@8
LRfFn^FPM
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /It.>1~2@
: CDialog(CCaptureDlg::IDD, pParent) FE^?U%:u@
{ D0,oml
//{{AFX_DATA_INIT(CCaptureDlg) [rD+8,zVm
m_bControl = FALSE; kM6
EZ`mj
m_bAlt = FALSE; SF78s:_!_
m_bShift = FALSE; :BC<+T=
m_Path = _T("c:\\"); "!w[U{
m_Number = _T("0 picture captured."); 1+.y,}F6b
nCount=0; kV]%Q3t
bRegistered=FALSE;
FCjYTGA
bTray=FALSE; {HE.mHy
//}}AFX_DATA_INIT _KT]l./
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >Gw%r1)
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CU}
q&6h
} noB}p4
K!$\REs
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y.TdWnXx
{ sf|_2sI
CDialog::DoDataExchange(pDX); 3XYIb Xnk
//{{AFX_DATA_MAP(CCaptureDlg) PLY-,Q&'
DDX_Control(pDX, IDC_KEY, m_Key); 10QNV=yK7s
DDX_Check(pDX, IDC_CONTROL, m_bControl); */fs.G:P
DDX_Check(pDX, IDC_ALT, m_bAlt); v/4X[6(
DDX_Check(pDX, IDC_SHIFT, m_bShift); E Ni%ge'":
DDX_Text(pDX, IDC_PATH, m_Path); ijR*5#5h
DDX_Text(pDX, IDC_NUMBER, m_Number); bb0{-T)1
//}}AFX_DATA_MAP Bm2}\KOI
} {H"=PYR
Kuzy&NI^w
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &6~ncQWu
//{{AFX_MSG_MAP(CCaptureDlg)
4 I]/
ON_WM_SYSCOMMAND() "O"^\f
ON_WM_PAINT() FSXKH {Z
ON_WM_QUERYDRAGICON() cl9;2D"Zm!
ON_BN_CLICKED(ID_ABOUT, OnAbout) 5y
'ycTjY
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R`<{W(J;r
ON_BN_CLICKED(ID_CHANGE, OnChange) $`+~QR!h
//}}AFX_MSG_MAP F".IB^}$
END_MESSAGE_MAP() joSr,'x
7\|NYT4
BOOL CCaptureDlg::OnInitDialog() GoZJDE3
{ JUUF^/J
CDialog::OnInitDialog(); Qnu&GBM
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NnSI)*%'
ASSERT(IDM_ABOUTBOX < 0xF000); "S:NU.c?
CMenu* pSysMenu = GetSystemMenu(FALSE); LTlC}3c28f
if (pSysMenu != NULL) u9y-zhj_$
{ SE7 (+r
CString strAboutMenu; d}6AHS[
strAboutMenu.LoadString(IDS_ABOUTBOX); rym\5
`)
if (!strAboutMenu.IsEmpty()) L_CEY
{ 3YZ3fhpw
pSysMenu->AppendMenu(MF_SEPARATOR); P\G C8KV]
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); WZy6K(18"'
} P.2.Ge|
} ]jT[dX|?
SetIcon(m_hIcon, TRUE); // Set big icon L-oPb)
SetIcon(m_hIcon, FALSE); // Set small icon |^&2zyUj/
m_Key.SetCurSel(0); CI3_lWax%
RegisterHotkey(); %lq7; emtp
CMenu* pMenu=GetSystemMenu(FALSE); Fw8X$SE"
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); tg%WVy2
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); My43\p
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); xQ(KmP2hl
return TRUE; // return TRUE unless you set the focus to a control dpOL1rrE
} nR|uAw
(>@syF%PB
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vp}>#&
{ V,*0<7h
if ((nID & 0xFFF0) == IDM_ABOUTBOX) qI/r_
{ :."n@sA@
CAboutDlg dlgAbout; l Ib>t
dlgAbout.DoModal(); ^`PSlT3<F
} 2/<WWfX'
else ;V(}F!U\z
{ &>^Ympr
CDialog::OnSysCommand(nID, lParam); 8"I5v(TV
} ( ;S]{z%
} C
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1'._SMP
void CCaptureDlg::OnPaint() *Uw#
{ 5]O LV1Xt
if (IsIconic()) zdQu%q
{ =v#A&IPA'
CPaintDC dc(this); // device context for painting J$=b&$I(
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l8
2uK"M
// Center icon in client rectangle d=u%"36y
int cxIcon = GetSystemMetrics(SM_CXICON); YdL1(|EdM
int cyIcon = GetSystemMetrics(SM_CYICON); ,EJ [I^
CRect rect; DD{@lM\vc
GetClientRect(&rect); )<&CnK
int x = (rect.Width() - cxIcon + 1) / 2; !5
:1'$d]H
int y = (rect.Height() - cyIcon + 1) / 2; z_iyuLRdb
// Draw the icon /iJhCB[QZ
dc.DrawIcon(x, y, m_hIcon); ?ia[KLt"
} HFCFEamBMP
else =.2cZwxX$
{ {m*J95[
CDialog::OnPaint(); 'H-YFB$l
} p 7E{es|J
} n[p9$W`
[Kj#KJxy
HCURSOR CCaptureDlg::OnQueryDragIcon() >IydXmTy
{ Spw=+z<<Ub
return (HCURSOR) m_hIcon; P`Wf'C^h
} /r 2.j3:l
U~`^Y8UF
void CCaptureDlg::OnCancel() /01(9(
{ (DaP~*c3cC
if(bTray) -tdON
DeleteIcon(); )(
jNd&H
CDialog::OnCancel(); l4.@YYzbp.
} 0JWD] "
YyBq+6nq5
void CCaptureDlg::OnAbout() .Im+()b&&
{ u KdX4
CAboutDlg dlg; T{J`t*Ym
dlg.DoModal(); |N3CoB
} {qdhp_~^l
?fX8WRdh
void CCaptureDlg::OnBrowse() rVW'KN
{ |4*2xDcl
CString str; kFs kn55
BROWSEINFO bi; H
{Wpf9_
K
char name[MAX_PATH]; _=$!T;}lE
ZeroMemory(&bi,sizeof(BROWSEINFO)); 4Tw1gas.
bi.hwndOwner=GetSafeHwnd(); 1|$Rzt%ge
bi.pszDisplayName=name; \$Qm2XKrK
bi.lpszTitle="Select folder"; g.VIe
bi.ulFlags=BIF_RETURNONLYFSDIRS; #)eJz1~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); T#;*I#A:
if(idl==NULL) (ZR"O8
return; SPm5tU
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +}Wo=R}
str.ReleaseBuffer(); yXQ;LQ;
m_Path=str; nU#q@p)Xg
if(str.GetAt(str.GetLength()-1)!='\\') Qvg"5_26v
m_Path+="\\"; "TNUw&ih
UpdateData(FALSE); . T>}O0L"
} >~8Df61o`
xb_:9
void CCaptureDlg::SaveBmp() a^1c _
{ I*ni )Px
CDC dc; i*E`<9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1:Gd{z
CBitmap bm; 5"]2@@b4
int Width=GetSystemMetrics(SM_CXSCREEN); +>%+r
int Height=GetSystemMetrics(SM_CYSCREEN); )Ea_:C'
bm.CreateCompatibleBitmap(&dc,Width,Height); M!i5StGC
CDC tdc; &_^<B7aC'k
tdc.CreateCompatibleDC(&dc); W {/z-&
CBitmap*pOld=tdc.SelectObject(&bm); FPFYH?;$
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jmNj#R@t
tdc.SelectObject(pOld); kO>{<$
BITMAP btm; lR3^&d72?
bm.GetBitmap(&btm); ~7H.<kJt
DWORD size=btm.bmWidthBytes*btm.bmHeight; ;;H:$lx
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \r9%;?f
BITMAPINFOHEADER bih; QQ8W;x
bih.biBitCount=btm.bmBitsPixel; b:&$x (|
bih.biClrImportant=0; V1U[p3J-S
bih.biClrUsed=0; p&27|1pZm
bih.biCompression=0; 4V3
w$:,
bih.biHeight=btm.bmHeight; 7C
yLSZ
bih.biPlanes=1; !/Ps}.)A`
bih.biSize=sizeof(BITMAPINFOHEADER); Ox'.sq4
bih.biSizeImage=size; P!ICno6[e
bih.biWidth=btm.bmWidth; . +?lID
bih.biXPelsPerMeter=0; ;MI<J>s
bih.biYPelsPerMeter=0; PTZ1oD
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); o/
5Fg>d
static int filecount=0; ZEJadR
CString name; D/`E!6Fk=
name.Format("pict%04d.bmp",filecount++);
n(1"6
name=m_Path+name; &4FdA|9T
BITMAPFILEHEADER bfh; &3?yg61Ag
bfh.bfReserved1=bfh.bfReserved2=0; sYgnH:t X
bfh.bfType=((WORD)('M'<< 8)|'B'); )5OU!c
bfh.bfSize=54+size; 1dO8[5uM7a
bfh.bfOffBits=54; 4!qDG+m
CFile bf; ?{IvA:
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ jU~%5R
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;^i,Q} b/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RV(z>XM
bf.WriteHuge(lpData,size); m~B=C>r}t
bf.Close(); DNe^_v)]|
nCount++; Ee&$9 )t
} OwaXG/z~
GlobalFreePtr(lpData); 21 j+c{O
if(nCount==1) uK5Px!
m_Number.Format("%d picture captured.",nCount); pwC/&bu
else zghm2{:`?g
m_Number.Format("%d pictures captured.",nCount); qm8RRDG
UpdateData(FALSE); ufPQ~,.
} TZ2f-KI
B6oAW ,3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q.AM
{ !m2k0|9
if(pMsg -> message == WM_KEYDOWN) q Q8l8
{ Q[KR,k
if(pMsg -> wParam == VK_ESCAPE) Shd,{Z)-Tg
return TRUE; }YO}LQ-|
if(pMsg -> wParam == VK_RETURN) w}b+vh^3Wy
return TRUE; 6vA5;a@
} ;N|>pSzmL
return CDialog::PreTranslateMessage(pMsg); 6iWuBsal
} vm4oaVi
i6kyfOI
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?Sxnq#r#
{ 6f>HE'N
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `yXy T^
SaveBmp(); -9"Ls?Cu
return FALSE; |L&V-f&K
} 3MVZ*'1QM\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ sSK$
CMenu pop; 8msDJ{,X
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t79MBgZ
CMenu*pMenu=pop.GetSubMenu(0); Oa
.%n9ec
pMenu->SetDefaultItem(ID_EXITICON); |VL,\&7rk
CPoint pt; GAlO<Mu
GetCursorPos(&pt);
KRe=n3 1
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }D O# {@af
if(id==ID_EXITICON) 0iHI"9z
DeleteIcon(); Y."[k&P-
else if(id==ID_EXIT) ^B9wmxe
OnCancel(); 0oMMJ6"i
return FALSE; '=@x2`U/
} NU[{oI<a
LRESULT res= CDialog::WindowProc(message, wParam, lParam); BoqW;SG$9
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) r%9Sx:F
AddIcon(); !
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return res; :u0433z:
} =I1@ O9}+i
jp]JFh;3
void CCaptureDlg::AddIcon() O7sn>uO
{ < lrw7 T
NOTIFYICONDATA data; )J0VB't
data.cbSize=sizeof(NOTIFYICONDATA); t;'.D @
CString tip; ![V-
e
tip.LoadString(IDS_ICONTIP); OUPpz_y
data.hIcon=GetIcon(0); ?6bE!36
data.hWnd=GetSafeHwnd(); <k!G%R<9
strcpy(data.szTip,tip); _p.{|7
data.uCallbackMessage=IDM_SHELL; RFdN13sJv
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; u4'Lm+&O
data.uID=98; uJ$,e5q
Shell_NotifyIcon(NIM_ADD,&data); z4goa2@Z
ShowWindow(SW_HIDE); G`z48
bTray=TRUE; TxWjgW~
} ;`+,gVrp
'Bx7b(xqk
void CCaptureDlg::DeleteIcon() {TNAK%'v
{ "=;&{N~8U
NOTIFYICONDATA data; AUK7a
data.cbSize=sizeof(NOTIFYICONDATA); Mi/_hzZ\
data.hWnd=GetSafeHwnd(); )C@,mgh
data.uID=98; Nvi14,q/
Shell_NotifyIcon(NIM_DELETE,&data); 4C:YEX~
ShowWindow(SW_SHOW); Q8n?7JB
SetForegroundWindow(); ^9nM)[/C?
ShowWindow(SW_SHOWNORMAL); 2,\uY}4
bTray=FALSE; &g`a [#
} r4s R5p]|
8z-Td- R6
void CCaptureDlg::OnChange() 83a
Rq&(R
{ 9maw+ c!~
RegisterHotkey(); gyK"#-/_d
} K*<n<;W
QbWD&8T0O
BOOL CCaptureDlg::RegisterHotkey() &,/T<V
{ w <ID<
UpdateData(); mR^D55k
UCHAR mask=0; bCF63(0
UCHAR key=0; a
srkuAS
if(m_bControl) 4$^=1ax
mask|=4; K02./ut-
if(m_bAlt) weOMYJO;8
mask|=2; cg~FW2Q
if(m_bShift) U
uysG\
mask|=1; ;,1i,?
key=Key_Table[m_Key.GetCurSel()]; k|V{jBG"@
if(bRegistered){ I2dt#
DeleteHotkey(GetSafeHwnd(),cKey,cMask);
,Y!)V
bRegistered=FALSE; 'K1w.hC<
} =aCv
Xa&,
cMask=mask; aE"t['
cKey=key; ~$$V=$&
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !m;VWGl*
return bRegistered; rtpjx%
} &}FYz8w 2/
Qi%A/~
四、小结 z 4-wvn<*
t^'1Ebg
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。