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:
AkO);4A;Jd
`pDTjJ 一、实现方法
+`V<&
Y-5l B` +,
8 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:
6
A#xFPYY{ suLC7x`Z #pragma data_seg("shareddata")
cuy9QBB
: HHOOK hHook =NULL; //钩子句柄
V=1zk-XC UINT nHookCount =0; //挂接的程序数目
|:2B )X static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
E&@#*~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
<_=O0 t|6 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
g$hEVT static int KeyCount =0;
mtE+}b@(!& static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
yFd942 #pragma data_seg()
Ar?ZU ASJ uT<<G)v) 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
9^Web~yi# OqF8KJnO; DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
nr}Ols *W,[k&;: BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
JxLfDr,dy cKey,UCHAR cMask)
uKD
}5M?{ {
[)0^*A2 BOOL bAdded=FALSE;
Vwjic2lGI for(int index=0;index<MAX_KEY;index++){
KPjAk if(hCallWnd[index]==0){
BxQ,T@ hCallWnd[index]=hWnd;
u.?jW vcv HotKey[index]=cKey;
3qH1\ HotKeyMask[index]=cMask;
`/!FZh< bAdded=TRUE;
7d|1T' KeyCount++;
i`vy<Dvpz break;
N cGFPi(Z }
M:& %c3 }
4ZR2U3jd1 return bAdded;
3=Rk(%:; }
5e7\tBab //删除热键
Q%J,:J BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
= iDd{$ {
cc}#-HKR[ BOOL bRemoved=FALSE;
UM]3MS:[ for(int index=0;index<MAX_KEY;index++){
TGPZUyi3!= if(hCallWnd[index]==hWnd){
mV4gw'.;7 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
D~M R)z_p~ hCallWnd[index]=NULL;
T:|p[Xbo HotKey[index]=0;
KQw>6) HotKeyMask[index]=0;
S0r+Y0J]< bRemoved=TRUE;
g:G5'pZf KeyCount--;
+bJ~S:[ break;
pm:- E(3# }
aX|(%1r }
(FgX9SV]p9 }
ZB/1I;l`c return bRemoved;
%Lh+W<; }
UK,sMKbl1 ~.0'v [N '^[+] DLL中的钩子函数如下:
8]1,E E< IJDbm}:/e LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$}z/BV1I {
Wyeb1 BOOL bProcessed=FALSE;
qZ@d:u if(HC_ACTION==nCode)
Q&?0 ^;r {
R?- zJ ; if((lParam&0xc0000000)==0xc0000000){// 有键松开
qcQq.cS_'N switch(wParam)
X{ 6a {
BB(v,W case VK_MENU:
$4)L~g| MaskBits&=~ALTBIT;
r=AA
/n< break;
v*<rNZI case VK_CONTROL:
koD}o^U# MaskBits&=~CTRLBIT;
0]=Bqyg break;
g)|vS>^~ case VK_SHIFT:
734n1-F?I% MaskBits&=~SHIFTBIT;
"*W# z break;
[fo#){3K default: //judge the key and send message
3MKu! break;
ucU7
@j }
N`N?1!fM<} for(int index=0;index<MAX_KEY;index++){
Zkqq< if(hCallWnd[index]==NULL)
*W>, 98 continue;
Q1|zX@, if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PDCb(5 {
X(3| (1;sV SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Y>
}\'$\b bProcessed=TRUE;
EIyFGCw|U }
7-~)/7L }
~%f$}{ }
k#8`996P else if((lParam&0xc000ffff)==1){ //有键按下
DQ[7p( switch(wParam)
d&f!\n_~ {
83{P7PBQ;] case VK_MENU:
-!li,&,A1 MaskBits|=ALTBIT;
>+Iph2] break;
dn Sb}J case VK_CONTROL:
f\.y z[ MaskBits|=CTRLBIT;
cx&\oP break;
n4}e!
case VK_SHIFT:
(~E-=+R[$& MaskBits|=SHIFTBIT;
z5Tsu1c break;
t+]1D@h v default: //judge the key and send message
aIrM-c8.O break;
b0f6p>~q^ }
^&8hhxCPu| for(int index=0;index<MAX_KEY;index++){
{~s\a2YH if(hCallWnd[index]==NULL)
I;eoy, continue;
niW"o-} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;$gV$KB:xA {
|_-w{2K SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)& Oxp&x bProcessed=TRUE;
Fav++ z }
IA[:-2_ }
S $o1Q }
&1&OXm$ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
M V!d*\ for(int index=0;index<MAX_KEY;index++){
;FF+uK if(hCallWnd[index]==NULL)
dga4|7-MY continue;
BGwD{6`U if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
l"DHG`kb SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?TK`s Gy //lParam的意义可看MSDN中WM_KEYDOWN部分
X!'C'3 X }
t,*1=S5 }
)|k#cT{=M }
UwF-*(#41 return CallNextHookEx( hHook, nCode, wParam, lParam );
.QwB7+V4 }
w%\{4T~ DG0I-"s 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:
!cM<&3/ "19#{yX4 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Y Q.Xl_ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
lz36;Fp 8~s0%%{,M 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:
d,Oagx WVOj;c LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%iEdU V\$ {
NqNU:_} if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
~1twGG_; {
y,ub*-: //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
k`|E&+og SaveBmp();
N}ND()bf return FALSE;
S4{vS?>j }
!J X7y%J …… //其它处理及默认处理
'-[hy>t }
Z~8%bfpe &NoA, `|7 DLqH*U 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。
Vwh;QJxb bDJ!Fc/ 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。
q1x[hv3
pP G e]NA]< 二、编程步骤
tgi%#8ZDpz vR2);ywX 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";
r=vY-p 5$HG#2"Kb# 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
R9#ar{ ~_N,zw{x 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
!k*B-@F e!gNd>b { 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
_X;,,VEV! ZeU){CB 5、 添加代码,编译运行程序。
wCR! bZ w ecoI-@CAI 三、程序代码
8 sc2r YGLq~A ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
v~T)g"_| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
/ Wjc\n$' #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
D6&P9e_5 #if _MSC_VER > 1000
]BjYUTNm #pragma once
E QU@';~8 #endif // _MSC_VER > 1000
fDplYn# #ifndef __AFXWIN_H__
*ls6k`ymL #error include 'stdafx.h' before including this file for PCH
x>TIx[x #endif
}5(_gYr #include "resource.h" // main symbols
Cb? !+U class CHookApp : public CWinApp
8Q<Nl=g>' {
R%\3[ public:
-Fn/= CHookApp();
Q<;EQb# // Overrides
'PY; // ClassWizard generated virtual function overrides
?QJx!'Y,p //{{AFX_VIRTUAL(CHookApp)
e7{6<[k3+$ public:
3C%|src virtual BOOL InitInstance();
b|DU virtual int ExitInstance();
Sk!' 2y*@& //}}AFX_VIRTUAL
zF[Xem //{{AFX_MSG(CHookApp)
)xa)$u // NOTE - the ClassWizard will add and remove member functions here.
24? _k]Y // DO NOT EDIT what you see in these blocks of generated code !
@<pd@Mpf] //}}AFX_MSG
R8u8jG(4 DECLARE_MESSAGE_MAP()
aY(s
& };
]?D$n LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
SM
RKEPwp& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
)D6i {I0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
V*Fy@ BOOL InitHotkey();
5YNAb/!!F BOOL UnInit();
"N=$=Dy> #endif
QK0]9 R=E4Sh //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
/*Q3=Dse] #include "stdafx.h"
X=)L$Kd7 #include "hook.h"
]w;t0Bk #include <windowsx.h>
50-7L, #ifdef _DEBUG
tugIOA #define new DEBUG_NEW
-bOtF% #undef THIS_FILE
Cy6!?Mik static char THIS_FILE[] = __FILE__;
w`f66*@Q1 #endif
mH ju$d #define MAX_KEY 100
SH =S> #define CTRLBIT 0x04
I5l%X{u"N #define ALTBIT 0x02
9=]HOUn #define SHIFTBIT 0x01
[qRww]g;P| #pragma data_seg("shareddata")
H7&y79mB HHOOK hHook =NULL;
UR_Ty59 UINT nHookCount =0;
`Kf@<= static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
x,10o static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
&`n:AR` static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
z8}QXXa static int KeyCount =0;
.$x}~Sw static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
9v*y&V9/ #pragma data_seg()
<5pNFj}0;X HINSTANCE hins;
Tr:@Dv.O void VerifyWindow();
oYf+I BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
juWXB+d2Y //{{AFX_MSG_MAP(CHookApp)
S$fS|N3]% // NOTE - the ClassWizard will add and remove mapping macros here.
jFe8s@7 // DO NOT EDIT what you see in these blocks of generated code!
=UK:83R( //}}AFX_MSG_MAP
E2w-b^,5 END_MESSAGE_MAP()
)rj!/% K g#Bg## CHookApp::CHookApp()
Aqf91
[c {
8WP"~Js! // TODO: add construction code here,
ineSo8| @ // Place all significant initialization in InitInstance
27c0wzq }
exiu;\+j VgYy7\?p CHookApp theApp;
{[Ri:^nHgL LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
T?!SEblP] {
"'Fvt-<^S7 BOOL bProcessed=FALSE;
IO8 @u;& if(HC_ACTION==nCode)
,~Xe#eM {
|&WYu,QQ4 if((lParam&0xc0000000)==0xc0000000){// Key up
O]hUOc`k switch(wParam)
,z#D[5 {
Hkia&nz'3 case VK_MENU:
UF5_be,D MaskBits&=~ALTBIT;
5p!{#r6m break;
NwYQ6VEA
case VK_CONTROL:
a1I-d=] MaskBits&=~CTRLBIT;
T|S-?X, break;
]3*w3Y!XK case VK_SHIFT:
vW*Mf}= MaskBits&=~SHIFTBIT;
RPeH [M^ break;
[3-u7Fx! default: //judge the key and send message
.Er+*j;&w break;
1/:vFX }
6-"tQ,AZ for(int index=0;index<MAX_KEY;index++){
diM*jN# if(hCallWnd[index]==NULL)
s-WZ3g continue;
jJ<&!= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
'\8YH+%It {
[Ca''JqrA SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
I$+=Fb'N0 bProcessed=TRUE;
O
]
!tK }
PV"\9OIKb. }
iN'T^+um= }
NkBvN\CQ else if((lParam&0xc000ffff)==1){ //Key down
iExKi1knx switch(wParam)
dba_(I~y {
MYara;k case VK_MENU:
`{Oqb MaskBits|=ALTBIT;
Wq}6RdY$ZA break;
-wC}JVVcK case VK_CONTROL:
w]T_%mdk MaskBits|=CTRLBIT;
_)Txg2?= break;
<$A/ (' case VK_SHIFT:
{N{eOa<HA MaskBits|=SHIFTBIT;
(oy@j{G)c6 break;
ojBdUG\ default: //judge the key and send message
i.On{nB"k break;
2&:z[d}~H }
)3e_Hs+ for(int index=0;index<MAX_KEY;index++)
@]~.-(IMh {
;rL1[qwk if(hCallWnd[index]==NULL)
ceks~[rP continue;
o!+'<IQ' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!fAvxR {
dgX%NKv1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
A ?V-Sz# bProcessed=TRUE;
v
))`U,Gm }
{RI^zNgs[ }
-;"A\2_y }
N@<-R<s^ if(!bProcessed){
;2g.X(Ra for(int index=0;index<MAX_KEY;index++){
sXPva@8_ if(hCallWnd[index]==NULL)
3A"TpR4f` continue;
Kzq^f=p if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ynMYf SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
OMjPC_ }
hC<E4+5., }
Z7y% }
T^7}Qs9 return CallNextHookEx( hHook, nCode, wParam, lParam );
'Bt!X^ }
Gy["_;+xU .c<U5/ BOOL InitHotkey()
R1Rk00Ow: {
M8Bp-_ if(hHook!=NULL){
"\;n t5L nHookCount++;
=m (u=|N3 return TRUE;
0k\,z(e }
CHqi5Z/+ else
ak:f4dEd hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
b9?Vpu`? if(hHook!=NULL)
FYC]^D nHookCount++;
='kCY}dkO return (hHook!=NULL);
0)K~pV0aT }
n?OMfx BOOL UnInit()
yCkc3s|DA; {
-9+$z|K if(nHookCount>1){
a $'U?% nHookCount--;
2,I]H'}^ return TRUE;
GK11fZpO:i }
kl1Q: BOOL unhooked = UnhookWindowsHookEx(hHook);
{GT5 if(unhooked==TRUE){
h|'|n/F nHookCount=0;
_M7|:* hHook=NULL;
'cS| BT }
Xu#?Lw return unhooked;
|)jR|8MAE }
P>~Usuf4 @Bkg< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
RlvvO {
U_aI!`WXd BOOL bAdded=FALSE;
G1zP^ogk for(int index=0;index<MAX_KEY;index++){
$1s>efP- if(hCallWnd[index]==0){
+Gy9K hCallWnd[index]=hWnd;
FR'Nzi$ HotKey[index]=cKey;
L5d
YTLY HotKeyMask[index]=cMask;
P$h) Y bAdded=TRUE;
DTi^* Wj KeyCount++;
vYLspZ;S break;
I=[0 9o }
nHXPEbq-g }
/:\27n return bAdded;
:D2GLq *\ }
86qQ"=v <]oPr1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
4V]xVma {
5?(dI9A"K BOOL bRemoved=FALSE;
<H<Aba9\ for(int index=0;index<MAX_KEY;index++){
WyQ8}]1b if(hCallWnd[index]==hWnd){
*j1Skd.#At if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
!](Mt?e hCallWnd[index]=NULL;
6y`FW[ HotKey[index]=0;
k{Y\YG%b
HotKeyMask[index]=0;
$OGMw+$C^ bRemoved=TRUE;
@#o7U KeyCount--;
n@C#,v#^0 break;
1UrkDz?X }
91a);d }
f<<$!]\ }
p ~+sk1[. return bRemoved;
XCn;<$3w }
Zcc7
7dRA Ew{N2 void VerifyWindow()
trLxg H_Y {
}VH2G94Ll for(int i=0;i<MAX_KEY;i++){
w+\RSqz/ if(hCallWnd
!=NULL){ ;U tEHvE*
if(!IsWindow(hCallWnd)){ v=uQ8_0~N
hCallWnd=NULL; X^m@*,[s
HotKey=0; V0#E7u`4
HotKeyMask=0; 'rfsrZ?
KeyCount--; BTA2['
} <X1[j9Qtv0
} %.uN|o&n
} Mj19;nc0I
} #:MoZw`rlw
!HXsxNe
BOOL CHookApp::InitInstance() iztF
{ |VM=:}s&
AFX_MANAGE_STATE(AfxGetStaticModuleState()); %md9ou`
hins=AfxGetInstanceHandle(); % 1<@p%y/
InitHotkey(); j6 _w2
return CWinApp::InitInstance(); ]8cD, NS
} F?y
C=
r|3u]rt
int CHookApp::ExitInstance() VWCC(YRU|$
{ ;gRPTk$X3
VerifyWindow(); >u
.u#d e
UnInit(); >Bm>/%2
return CWinApp::ExitInstance(); $'a]lR
} +}-cvM/*
FklO#+<:
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h{)`W
]~
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n2F*a
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ AMK3I`=8WO
#if _MSC_VER > 1000 N=8CVI
#pragma once p1z^i(
#endif // _MSC_VER > 1000 ,~K4+
t_
HE2t0sAYX
class CCaptureDlg : public CDialog /cZcfCW
{ *9r 32]i;
// Construction G%%F6)W
public: ,zBc-Cm
BOOL bTray; \/y&l\ k)
BOOL bRegistered; Y$3liDeL=
BOOL RegisterHotkey(); " M&zW&
UCHAR cKey; {N-*eV9#
UCHAR cMask; TjctK [db@
void DeleteIcon(); KZ [:o,jp>
void AddIcon(); }L5;=A']S
UINT nCount; K~8!Gh{h]
void SaveBmp(); .d4&s7n0
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]b^bc2:
// Dialog Data %NL7XU[~
//{{AFX_DATA(CCaptureDlg) P\
2Bx *e
enum { IDD = IDD_CAPTURE_DIALOG }; f5nAD
CComboBox m_Key; 3ZYrNul"
BOOL m_bControl; rV
I-Yb
BOOL m_bAlt; m{6*ae
BOOL m_bShift; fvDcE]_%H
CString m_Path; F2=#\U$
CString m_Number; V Z60
//}}AFX_DATA 6lxZo_
// ClassWizard generated virtual function overrides _ 1\H{x
//{{AFX_VIRTUAL(CCaptureDlg) gLg\W3TOi
public: d[ce3':z
virtual BOOL PreTranslateMessage(MSG* pMsg); >P ygUY
d
protected: UWBR5
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ). HnK
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K5d>{c
//}}AFX_VIRTUAL xkz`is77Y@
// Implementation q +c~Bd
protected: Fw"x4w
HICON m_hIcon; dC">AW
// Generated message map functions -EU~
%/=m+
//{{AFX_MSG(CCaptureDlg) nyd'79~>G
virtual BOOL OnInitDialog(); LoS%FI
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b=Q%Jxz?
afx_msg void OnPaint(); YccD^w[`B
afx_msg HCURSOR OnQueryDragIcon(); T:udw
virtual void OnCancel(); N8]d0
afx_msg void OnAbout(); k%cT 38V*
afx_msg void OnBrowse(); FBI^}^#_
afx_msg void OnChange(); a^9}ceu?
//}}AFX_MSG &R}2/Mt
DECLARE_MESSAGE_MAP() /vFdhh
}; `ve5>aw0_Y
#endif 4*+)D8
T(eNK
c2
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }nNCgH
#include "stdafx.h" 3ry0.
#include "Capture.h" _&F*4t!n_
#include "CaptureDlg.h" XE*#5u8t
#include <windowsx.h> *U4eL-
#pragma comment(lib,"hook.lib") :WN*wd
#ifdef _DEBUG xV5eKV
#define new DEBUG_NEW @1 )][r-7
#undef THIS_FILE :U#4H;kk~j
static char THIS_FILE[] = __FILE__; 0o&7l%Y/
#endif [6a&9#[A
#define IDM_SHELL WM_USER+1 80O[pf*?
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z <tJ+
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V8J!8=2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,O"zz7
class CAboutDlg : public CDialog s$OnQc2/
{ \Ot,&Z k2
public: p< jM%fbZk
CAboutDlg(); ais"xm<V
// Dialog Data [,p[%Dza
//{{AFX_DATA(CAboutDlg) {= l9{K`~
enum { IDD = IDD_ABOUTBOX }; 09rbu\h
//}}AFX_DATA yi3Cd@t({{
// ClassWizard generated virtual function overrides h{M.+I$}C
//{{AFX_VIRTUAL(CAboutDlg) e?!A]2
protected: \!:^=2VF
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S4(lC%$|
//}}AFX_VIRTUAL d+Jj4OnP
// Implementation /=ro$@
protected: `zOQ*Y&
//{{AFX_MSG(CAboutDlg) OX)[?1m8
//}}AFX_MSG @Vac!A??:
DECLARE_MESSAGE_MAP() skn];%[v\
}; 2=xjgK
Ycve[31BDd
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *b]$lj
{ N;]"_"
//{{AFX_DATA_INIT(CAboutDlg) `+Ojh>"*z*
//}}AFX_DATA_INIT AE 2>smp5@
} a-7T
JN-wToOF
void CAboutDlg::DoDataExchange(CDataExchange* pDX) I HtNaN )
{ c2<JS:!*
CDialog::DoDataExchange(pDX); D>Dch0{H,:
//{{AFX_DATA_MAP(CAboutDlg) 'uw=)8t7
//}}AFX_DATA_MAP 8!{F6DG
} ^<O=<tN\
MHkTN
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Kr'5iFK7
//{{AFX_MSG_MAP(CAboutDlg) $&iw (BIq
// No message handlers -%^KDyZ<&
//}}AFX_MSG_MAP I='S).
END_MESSAGE_MAP() 7ClN-/4
BiUbg6T.G
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @'{m-?*
: CDialog(CCaptureDlg::IDD, pParent) q}mQm'
{ U(cV#@Y
//{{AFX_DATA_INIT(CCaptureDlg) A~Ov(
m_bControl = FALSE; U6@j=|q
m_bAlt = FALSE; #^fDKM
m_bShift = FALSE; yb:Xjg7
m_Path = _T("c:\\"); {
'Db
m_Number = _T("0 picture captured."); <Sx-Ca7
nCount=0; ?oX.$E?(
bRegistered=FALSE; J}cqBk>
bTray=FALSE; 2pEr
s|r
//}}AFX_DATA_INIT Bdd>r#]
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0R%R2p'wG
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :m[HUh
} !<UdG+iV
9zD,z+
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r]B`\XWz
{ G@4n]c_
CDialog::DoDataExchange(pDX); 89YG
`
//{{AFX_DATA_MAP(CCaptureDlg) sHPK8Wsg
DDX_Control(pDX, IDC_KEY, m_Key); Qm)c!
DDX_Check(pDX, IDC_CONTROL, m_bControl); 9&"wfN N
DDX_Check(pDX, IDC_ALT, m_bAlt); vWZ?*0^
DDX_Check(pDX, IDC_SHIFT, m_bShift); iI$;%uY3g
DDX_Text(pDX, IDC_PATH, m_Path); k fY0u
DDX_Text(pDX, IDC_NUMBER, m_Number); wu;^fL
//}}AFX_DATA_MAP FwpTQix!
} q71V]!
,KaO8^PB
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J93@\b
//{{AFX_MSG_MAP(CCaptureDlg) tpn.\z%
ON_WM_SYSCOMMAND() KPxf
ON_WM_PAINT() /ptG
ON_WM_QUERYDRAGICON()
X?z
CB
ON_BN_CLICKED(ID_ABOUT, OnAbout) y(yBRR
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mNPz%B
ON_BN_CLICKED(ID_CHANGE, OnChange) Z5Tu*u=
//}}AFX_MSG_MAP G4,.kK
END_MESSAGE_MAP() A(1WQUu j
fU>4Ip1?y/
BOOL CCaptureDlg::OnInitDialog() `G<|5pe
{ o9+fAH`D
CDialog::OnInitDialog(); We@wN:
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J l
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ASSERT(IDM_ABOUTBOX < 0xF000); *XkgwJq
CMenu* pSysMenu = GetSystemMenu(FALSE); 2&0#'Tb
if (pSysMenu != NULL) ja%IGaH;s
{ axM(3k.n
CString strAboutMenu; b" kL)DL1L
strAboutMenu.LoadString(IDS_ABOUTBOX); >/9Qgyc0
if (!strAboutMenu.IsEmpty()) m/"}Y]n!
{ LrhQG
pSysMenu->AppendMenu(MF_SEPARATOR); ^TqR0a-*
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +-PFISa<r
} %TDY &@i=
} 9)S,c=z83
SetIcon(m_hIcon, TRUE); // Set big icon $p\ 0/
SetIcon(m_hIcon, FALSE); // Set small icon `C)|}qcC
m_Key.SetCurSel(0); "
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RegisterHotkey(); 3z!^UA>q
CMenu* pMenu=GetSystemMenu(FALSE); Gf<%bQE
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); y:VY8a 4
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); e[g.&*!
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); xP5Z -eL
return TRUE; // return TRUE unless you set the focus to a control S20E}bS:>
} Bi`m +ob
v4W<_
7L_
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R[!%d6jDE
{ B18?)LA
if ((nID & 0xFFF0) == IDM_ABOUTBOX) >$_@p(w
{ kp8kp`S7
CAboutDlg dlgAbout; 4=ZN4=(_[
dlgAbout.DoModal(); <*+Y]=
} qR^i5JH}u
else f"d4HZD^
{ L r9z~T:ED
CDialog::OnSysCommand(nID, lParam); :pGgxO% q
} |K'7BK_^J
} I7{
Q\C4
S,GM!YZg
void CCaptureDlg::OnPaint() 10ZL-7D#m
{ +5ue)`
if (IsIconic()) 3bR 6Y[
{ otJHcGv
CPaintDC dc(this); // device context for painting 4@"n7/<
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Ya
~lPc
// Center icon in client rectangle FfibR\dhY
int cxIcon = GetSystemMetrics(SM_CXICON); ;f~z_3g
int cyIcon = GetSystemMetrics(SM_CYICON); Z]k+dJ[-
CRect rect; vU!<-T#
GetClientRect(&rect); V w5@)l*f
int x = (rect.Width() - cxIcon + 1) / 2; 0T<DHPQ1
int y = (rect.Height() - cyIcon + 1) / 2; K~jN"ev
// Draw the icon E)%r}4u>
dc.DrawIcon(x, y, m_hIcon); )B5(V5-!|
} nm
!H<
else 3.D|xE]g
{ --g?`4
CDialog::OnPaint(); `l<pH<F
} =>Dw,+"
} XO"BEj<x
Ku;8Mx{
HCURSOR CCaptureDlg::OnQueryDragIcon() 'Q4V(.
{ j(`V&S
return (HCURSOR) m_hIcon; j WerX -$
} SkMBdkS9z[
$6yr:2Xvt
void CCaptureDlg::OnCancel() V>B*_J,z.
{ #brV{dHV,
if(bTray) %^<A`Q_
DeleteIcon(); S0mF%"
CDialog::OnCancel(); @+^5ze\
} a+p_47 xa
:~B'6b
void CCaptureDlg::OnAbout() %|gj46
{ ]?j[P=\
CAboutDlg dlg; KI8Q
=*
dlg.DoModal(); uf}Q{@Ab
} @P
xX]e
z9P;HGuZ
void CCaptureDlg::OnBrowse() 7Hp~:i30
{ ,?>:Cdz4
CString str; P] 9-+
BROWSEINFO bi; l@nG?l #
char name[MAX_PATH]; 7|$
H}$
ZeroMemory(&bi,sizeof(BROWSEINFO)); x\!Uk!fM
bi.hwndOwner=GetSafeHwnd(); 7s'r3}B`
bi.pszDisplayName=name; uY*|bD`6&
bi.lpszTitle="Select folder"; cT,5xp"a
bi.ulFlags=BIF_RETURNONLYFSDIRS; Odj4)
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]QK@zb}x
if(idl==NULL) 9lCZi?
return; 1
Ll<^P
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); SBqx_4}
str.ReleaseBuffer(); pxO?:B
m_Path=str; eWwI@ASaA
if(str.GetAt(str.GetLength()-1)!='\\') *WX,bN6Ot
m_Path+="\\"; Ex3V[v+D(
UpdateData(FALSE); @&E{
L
}
C#x9RW
c=A)_ZFg
void CCaptureDlg::SaveBmp() LG3:V'|
{ F3V_rE<
CDC dc; Ah<6m5+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7SpF&
CBitmap bm; pCm |t!,
int Width=GetSystemMetrics(SM_CXSCREEN); iPoDesp
int Height=GetSystemMetrics(SM_CYSCREEN); (>gAnebN
L
bm.CreateCompatibleBitmap(&dc,Width,Height); PgF7ug%,@C
CDC tdc; 1%,AU
tdc.CreateCompatibleDC(&dc); K\]I@UTwq
CBitmap*pOld=tdc.SelectObject(&bm); ??.9`3CYo
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7Yrp#u1!
tdc.SelectObject(pOld); H3Z"u
BITMAP btm; _/zK^S)
bm.GetBitmap(&btm); 'dTg\
Qv
DWORD size=btm.bmWidthBytes*btm.bmHeight; .ko}m{
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ^6[o$eY3
BITMAPINFOHEADER bih; qC?\i['`
bih.biBitCount=btm.bmBitsPixel; N#? Ohz
bih.biClrImportant=0; $Q!J.}P@
bih.biClrUsed=0; p4-bD_
bih.biCompression=0; 4,pS C
bih.biHeight=btm.bmHeight; 7ZVW7%,zF
bih.biPlanes=1; T2V#
fYCc
bih.biSize=sizeof(BITMAPINFOHEADER); (`pd>
bih.biSizeImage=size; }R -azN;
bih.biWidth=btm.bmWidth; Q #%C)7)
bih.biXPelsPerMeter=0; @hE$x-TP0
bih.biYPelsPerMeter=0; HX]pcX^K
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); umD[4aP~;
static int filecount=0; A&~<qgBTp
CString name; E6NrBPm
name.Format("pict%04d.bmp",filecount++); >9v?p=
name=m_Path+name; 7>Oa, \
BITMAPFILEHEADER bfh; \x_fP;ma=_
bfh.bfReserved1=bfh.bfReserved2=0; G~\ SI.
bfh.bfType=((WORD)('M'<< 8)|'B'); '/"x MpN 4
bfh.bfSize=54+size; &J~%Nt
bfh.bfOffBits=54; yIdM2#`u
CFile bf; Ltt+BUJc
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^?3e?Q?
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ird
q51{G
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); z<rYh96uA
bf.WriteHuge(lpData,size); N<54_(|X
bf.Close(); mVBF2F<4
nCount++; 0$9I.%4jAJ
} 5c~OG6COx
GlobalFreePtr(lpData); FOU^Wcop%
if(nCount==1) mjd9]HgN
m_Number.Format("%d picture captured.",nCount); D>c-h)2|
else oqOXRUy
m_Number.Format("%d pictures captured.",nCount); E'g2<k
UpdateData(FALSE); >{dj6Wo
} mfNYN4Um6
*?#t (Y[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +|w-1&-
{ Z=vzF0
if(pMsg -> message == WM_KEYDOWN) = yH#Iil
{ G'>z~I]6S
if(pMsg -> wParam == VK_ESCAPE) lTh}0t
return TRUE; G
39
if(pMsg -> wParam == VK_RETURN) Tmo+I4qoL
return TRUE; mj{/'
} Hlw0ia
return CDialog::PreTranslateMessage(pMsg); \y%:[g}Fvw
} vh~:{akR
nFn@Z'T$N
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /!*gH1s
{ p?X`f#
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G([!(8&2Y
SaveBmp(); kOfu7Zj
return FALSE; MO{6B#(<F
} 0-^wY8n-=
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dD2N!umW
CMenu pop; I<I?ks
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $z9z'^HqO
CMenu*pMenu=pop.GetSubMenu(0); b (,X3x*
pMenu->SetDefaultItem(ID_EXITICON); K_Jo^BZ
CPoint pt; Xj\SJ*
GetCursorPos(&pt); o'3t(dyyH
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); S;"7d
if(id==ID_EXITICON) .kT5 4U;{
DeleteIcon(); A|BvRZd
else if(id==ID_EXIT) nx(O]R,Sw
OnCancel(); L}&U%eD
return FALSE; }xl
@:Qo
} nJTV@mXVq
LRESULT res= CDialog::WindowProc(message, wParam, lParam); .>-`2B*/
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) GB+U>nf
AddIcon(); *q%)q
return res; VxOrrs7Z
} T~k5` ~\(
NC;4
void CCaptureDlg::AddIcon() P^%.7C
{ (YjY=F
NOTIFYICONDATA data; Uv6#d":f;
data.cbSize=sizeof(NOTIFYICONDATA); ~%4#R4&
CString tip; sa~.qmqu
tip.LoadString(IDS_ICONTIP); :;u~M(R
data.hIcon=GetIcon(0); {)eV) 2a
data.hWnd=GetSafeHwnd(); Kt%`]Wp
strcpy(data.szTip,tip); 2'"$Y'
data.uCallbackMessage=IDM_SHELL; 4"e7 43(
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lA39$oJ
data.uID=98; 3ySP*J5
Shell_NotifyIcon(NIM_ADD,&data); ;6o p|
ShowWindow(SW_HIDE); =;{vfjj
bTray=TRUE; n_@YKz;8
} /Xi:k
Kfc(GL?
void CCaptureDlg::DeleteIcon() @|&P#wd.u
{ (U/xpj}
NOTIFYICONDATA data; ;bd\XHwMUP
data.cbSize=sizeof(NOTIFYICONDATA); 63QSYn,t
data.hWnd=GetSafeHwnd(); a$I;
L
data.uID=98; $S$%avRX
Shell_NotifyIcon(NIM_DELETE,&data); Aa&3x~3+
ShowWindow(SW_SHOW); 5Mb1==/R
SetForegroundWindow(); V#W(c_g
ShowWindow(SW_SHOWNORMAL); TA=Ij,z~
bTray=FALSE; S:] w@$
} nMcd(&`N
EIl _QV6
void CCaptureDlg::OnChange() a%f5dj+
{ m=2TzLVv
RegisterHotkey(); /^v4[]
} }k}5\%#li5
J4te!,
BOOL CCaptureDlg::RegisterHotkey() 5I{YsM
{ FuaGr0]
UpdateData(); \z8TYx@
UCHAR mask=0; =,I,K=+_x
UCHAR key=0; `3r *Ae
if(m_bControl) p&bQ_ XOH
mask|=4; 4qjY,QJ
if(m_bAlt) G%anot
mask|=2; Y3[<
if(m_bShift) WJ\YKXG
mask|=1; 8k+Ctk
key=Key_Table[m_Key.GetCurSel()]; $cH'9W}3K
if(bRegistered){ 8T
6jM+ h
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3}$L4U
bRegistered=FALSE; #hzs,tvvD
} XH)MBr@Fz
cMask=mask; iD@2_m)
cKey=key; bdqo2ZO
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qwA:o-q"
return bRegistered; Zx5vIm
} =#1iio&
D6_16PJE
四、小结 33couAP#
}?>30+42:
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。