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:
vKDRjrF-
_5.^A&Y* 一、实现方法
5FnWlFc z:|4S@9 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:
Uw5z]Jck &?/h#oF@\ #pragma data_seg("shareddata")
#Z}\;a{vZ HHOOK hHook =NULL; //钩子句柄
ju(&v*KA UINT nHookCount =0; //挂接的程序数目
h{yqNl static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
s6w</ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
4)-LlYS_d< static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
;p/RS# static int KeyCount =0;
G1vWHa7n;f static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
>tqLwC."' #pragma data_seg()
Ezm ~SY MVH^["AeR 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。
d5%A64? "MKgU[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:
q.t>:` 0eQyzn*98 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ykxjT@[ cKey,UCHAR cMask)
]0zXpMNI {
?z171X0 BOOL bAdded=FALSE;
s6rdQI] for(int index=0;index<MAX_KEY;index++){
M/ 0!B_(R if(hCallWnd[index]==0){
P8Fq %k hCallWnd[index]=hWnd;
EMmNlj6 HotKey[index]=cKey;
1[a;2xA~ HotKeyMask[index]=cMask;
b"t!nfgo bAdded=TRUE;
$VhUZGuG> KeyCount++;
,;'9PsIS^ break;
v}IkY }
{ o=4(RC }
A/,7%bB1 return bAdded;
wZ,9~P7 }
^vLHs=< //删除热键
q[nX<tO BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.KGW#Qk8 {
_+S`[:;a BOOL bRemoved=FALSE;
O$E3ry+? for(int index=0;index<MAX_KEY;index++){
^UZEdR; if(hCallWnd[index]==hWnd){
KO<Yc`Fs if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
H ZIJKk( hCallWnd[index]=NULL;
3lqR(Hh3 HotKey[index]=0;
V{O,O,* HotKeyMask[index]=0;
.%h.b6^ bRemoved=TRUE;
B9/x?Jv1 KeyCount--;
'%yWz)P break;
s@E"EWp0 }
X5cl'J(j9 }
bBc<yaN }
0R>M_| return bRemoved;
[iwn"e }
[bIdhG M])Y|}wv8 ((\s4- DLL中的钩子函数如下:
81fpeoNO G%
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
En&ESWN {
Pq>r|/~_ BOOL bProcessed=FALSE;
{v}f/cu if(HC_ACTION==nCode)
o>W H;EBL {
8xs[{?|: if((lParam&0xc0000000)==0xc0000000){// 有键松开
.vj`[?T switch(wParam)
S
"R]i {
PGsXB"k<8 case VK_MENU:
iE, I\TY[ MaskBits&=~ALTBIT;
r
ioNP( break;
.dt7b4.kd case VK_CONTROL:
#Sr_PEo
_ MaskBits&=~CTRLBIT;
E'?yI'~= break;
t?L;k+sMM case VK_SHIFT:
%kS +n_* MaskBits&=~SHIFTBIT;
U,yU-8z/ break;
$(H%|Oyn default: //judge the key and send message
2K'3ry)[y break;
[h+MA>%! }
ZWQrG'$?o8 for(int index=0;index<MAX_KEY;index++){
k]!Fh^O~, if(hCallWnd[index]==NULL)
r9sW:cM:e continue;
\Y_2Z/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jxU1u"WU {
%Wkvo-rOq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
;t{Ew+s bProcessed=TRUE;
dFFJw[$8w }
nR-`;lrF~ }
Mdsn"Y V }
MU4/arXy else if((lParam&0xc000ffff)==1){ //有键按下
m{
.'55 switch(wParam)
(ec?_N0= {
abh='5H|^| case VK_MENU:
.p NWd MaskBits|=ALTBIT;
<UOx >=h break;
<[ />M case VK_CONTROL:
Z|K+{{C MaskBits|=CTRLBIT;
5:6as^i:b break;
v*SSc5gFG case VK_SHIFT:
AA"?2dF MaskBits|=SHIFTBIT;
obKWnet break;
9bRlSb@ default: //judge the key and send message
U:ggZ`. break;
0f}zm8p7. }
NBuibL for(int index=0;index<MAX_KEY;index++){
1{i)7:Y if(hCallWnd[index]==NULL)
Kv^ez%I continue;
fNNkc[YTZI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^I=c]D]); {
!qsk;Vk7Z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
s!esk%h{K bProcessed=TRUE;
!'o5X]s }
XW
w=3$ }
'^)Ve:K-. }
w?)v#]<- if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
6ziiV_p for(int index=0;index<MAX_KEY;index++){
l2QO\O
I9m if(hCallWnd[index]==NULL)
]fvU}4! continue;
4nQk*:p(X if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
i_Dv+^&zV SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
pXf!8X&y //lParam的意义可看MSDN中WM_KEYDOWN部分
ZqT?7 |i }
4bLk+EY4A }
SIv8EMGo }
"jqC3$DKI return CallNextHookEx( hHook, nCode, wParam, lParam );
^-?5=\`5 }
S=H<5*]g ++n"`
]o, 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
6nqG;z-IXJ 2\h}6DGx2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.VG$`g" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
kY*3)KCp ,S5tkTa 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:
M24FuS V9[-# Ti LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
k>y68_ {
=r=[e}&9 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Pz#D9.D0 {
eSo/1D //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
[,[;'::=o4 SaveBmp();
}6ObQa43 return FALSE;
Rp$t;=SMD }
MF:]J …… //其它处理及默认处理
VN`T:!& }
=!u9]3) Tap=K|b ]
b*Ny 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。
$0>>Z ,_;+H*H>" 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
l^aG"")TH. RzCC>- 二、编程步骤
rI34K~ P zK`fX 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
4np,"^c #RAez:BI 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?w6zq| w@RVg*`%7D 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
kx,9n) VeK^hz
R^Z 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
GyI(1OAW "8MG[$Y 5、 添加代码,编译运行程序。
^2Sa_. B;xw @:H 三、程序代码
<tkxE!xF`J AffVah2o: ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
B;Pws$J #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
W:D'k^u #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
^9*FYV #if _MSC_VER > 1000
EWuuNf #pragma once
x xxM #endif // _MSC_VER > 1000
0sq?;~U #ifndef __AFXWIN_H__
3Mw\}q #error include 'stdafx.h' before including this file for PCH
^.bYLF #endif
Zwy8SD'L #include "resource.h" // main symbols
Sh'>5z2 class CHookApp : public CWinApp
rmpx8CY" {
k8fvg4 public:
o=i)s2 CHookApp();
+ E8\g // Overrides
)6mx\t // ClassWizard generated virtual function overrides
8tq6.%\ //{{AFX_VIRTUAL(CHookApp)
f1GV6/| m public:
<L|eY(: virtual BOOL InitInstance();
s/ [15 virtual int ExitInstance();
0tbximmDb //}}AFX_VIRTUAL
i*34/ //{{AFX_MSG(CHookApp)
:&D>?{b0 // NOTE - the ClassWizard will add and remove member functions here.
|Y'xtOMX // DO NOT EDIT what you see in these blocks of generated code !
U 7mA~t2E //}}AFX_MSG
m NkS!(L6 DECLARE_MESSAGE_MAP()
L B`=+FD };
}G^Bc4@b LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
0CXh|AU BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
p\lS)9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
S%KY%hUt BOOL InitHotkey();
*p!K9$4 BOOL UnInit();
bz!9\D|h #endif
hKq <e%oVH W\09hZ6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^]mwL)I} #include "stdafx.h"
tln*Baq #include "hook.h"
vd7%#sHH& #include <windowsx.h>
{
?p55o #ifdef _DEBUG
!(\OT #define new DEBUG_NEW
'VA\dpa{J #undef THIS_FILE
""`>v`\ static char THIS_FILE[] = __FILE__;
e*5TZ7. #endif
=Ny&`X#F #define MAX_KEY 100
zA+&V7bvy #define CTRLBIT 0x04
nLK%5C #define ALTBIT 0x02
L \0nO i #define SHIFTBIT 0x01
WBTdQG
Q6 #pragma data_seg("shareddata")
<3\t J HHOOK hHook =NULL;
$47cKit|k: UINT nHookCount =0;
\(UEjlo static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
GCx1lm static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
Jp)>Wd static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
'Y23U7 n0B static int KeyCount =0;
hpJ[VKe static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
MGn:Gj"d #pragma data_seg()
O+Z[bis` HINSTANCE hins;
h%e}4U@X void VerifyWindow();
yjCY2T E BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
9G(.=aOj, //{{AFX_MSG_MAP(CHookApp)
Hb&-pR@e\? // NOTE - the ClassWizard will add and remove mapping macros here.
`_{'qqRhe // DO NOT EDIT what you see in these blocks of generated code!
sW%U3,j //}}AFX_MSG_MAP
S<^*jheO5 END_MESSAGE_MAP()
)W^Wqa8mG| ,aI 6P- CHookApp::CHookApp()
#;. tVo I {
F5Ce:+h // TODO: add construction code here,
xR5jy|2JJ // Place all significant initialization in InitInstance
$-""=O|" }
~7PPB|XY w-Zb($_ CHookApp theApp;
}N;c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
:32 {
M ,.++W\ BOOL bProcessed=FALSE;
9:0JWW^so if(HC_ACTION==nCode)
yO
Cv-zm {
`X?l`H;# if((lParam&0xc0000000)==0xc0000000){// Key up
%XGwQB$zk8 switch(wParam)
IQ$l!) {
Nx4_Oc^hY case VK_MENU:
PN0l#[{EN MaskBits&=~ALTBIT;
N*JWd break;
WE$Pi;q1 case VK_CONTROL:
w?kdM1T MaskBits&=~CTRLBIT;
Zcd!y9]# break;
31mY]Jve" case VK_SHIFT:
pE >~F MaskBits&=~SHIFTBIT;
U+sAEN_e k break;
O?Xg%k# default: //judge the key and send message
Z[8{V break;
pK O\tkMJ }
vGWX= O for(int index=0;index<MAX_KEY;index++){
Y604peUF if(hCallWnd[index]==NULL)
k!E`Xeob continue;
SPA_a\6_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A
S;ra,x {
q[]EVs0$ew SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(1\!6 bProcessed=TRUE;
jM1|+o*Wr }
$5nOi aQL }
rly3f }
Q%4>okj, else if((lParam&0xc000ffff)==1){ //Key down
) ^PY-~o[ switch(wParam)
aE.T%xR {
!!f)w!wW case VK_MENU:
7]a6dMh MaskBits|=ALTBIT;
R:YX{Tq break;
!]qwRB$5 case VK_CONTROL:
CD1}.h MaskBits|=CTRLBIT;
Ty\&ARjb 8 break;
Nb\4Mv` case VK_SHIFT:
A" `62 MaskBits|=SHIFTBIT;
h$|K vS break;
xin<.)!E default: //judge the key and send message
(A`/3Aq+ break;
M$A"<5 }
1fwCQM for(int index=0;index<MAX_KEY;index++)
e$QX?y . {
$A6'YgK if(hCallWnd[index]==NULL)
VR5$[-E3 continue;
$Hqm 09w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
S:{hgi,T* {
[r_,BH\nu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
m *8[I bProcessed=TRUE;
O?NAbxkp }
lwPK^)|} }
I"*g-ji0 }
/HH5Mn* if(!bProcessed){
(qHI>3tpY for(int index=0;index<MAX_KEY;index++){
T#?KY if(hCallWnd[index]==NULL)
{y=H49 continue;
oz%ZEi\bW if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"XMTj <D SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
N8:?Z#z }
nU%rSASu }
[(}f3W & }
6grJoim| return CallNextHookEx( hHook, nCode, wParam, lParam );
tUv@4<~,/ }
t`03$&Cx7 rs2~spN;h BOOL InitHotkey()
%stZ'IX {
a?E]-Zf if(hHook!=NULL){
?sDm~]Z nHookCount++;
6N\~0d>5m return TRUE;
L<]j& }
D:'|poH else
34U/"+|z hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
/ 78gXHv if(hHook!=NULL)
')I/D4v nHookCount++;
My'M~#kO, return (hHook!=NULL);
& PrV+Lv }
=K{$?%"
BOOL UnInit()
YFOK%7K {
-QCo]:cp if(nHookCount>1){
Z'<=06 nHookCount--;
^*'|(Cv return TRUE;
j#y_# }
z^I"{eT8 BOOL unhooked = UnhookWindowsHookEx(hHook);
Qpiv,n if(unhooked==TRUE){
wcP0PfY nHookCount=0;
~ C6<75 hHook=NULL;
C ,z7f" }
EaFd1 return unhooked;
`zRgP# }
ja70w:ja MX6*waQ-< BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<M=U @ {
cH'*J/ BOOL bAdded=FALSE;
F%bv
vw*( for(int index=0;index<MAX_KEY;index++){
8dq{.B? if(hCallWnd[index]==0){
016l$K4 hCallWnd[index]=hWnd;
/L'm@8 HotKey[index]=cKey;
;r>?V2,tm HotKeyMask[index]=cMask;
ui`xgR\6Rh bAdded=TRUE;
=1)yI>2e%} KeyCount++;
3SVI|A5(d break;
O\pqZ`E=s }
kmNY
;b6Y$ }
nCh9IF[BL/ return bAdded;
p=\DZU~1 }
4?g~GI3 z|F>+6l"Y7 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
tc\LK_@$/F {
j{>E.F2. BOOL bRemoved=FALSE;
8^&)A b for(int index=0;index<MAX_KEY;index++){
lF5;Kc if(hCallWnd[index]==hWnd){
Bo.x if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I:uxj% hCallWnd[index]=NULL;
F}<&@ 7kF HotKey[index]=0;
D}px=? HotKeyMask[index]=0;
n_AW0i. bRemoved=TRUE;
Y1+4ppZ KeyCount--;
ygS*))7
r break;
$$<9tqA }
SG
|!wH^ }
t*zve,?} }
N+\#k*n? return bRemoved;
7xB#) o53 }
QE)I7( IJx dbuKg void VerifyWindow()
*pw:oTO {
)FT~gl% for(int i=0;i<MAX_KEY;i++){
5H:NY| if(hCallWnd
!=NULL){ -]~U_J]
if(!IsWindow(hCallWnd)){ >pO[S[
hCallWnd=NULL; j\q1b:pE
HotKey=0; ?*K;+@EH
HotKeyMask=0; f'\I52;FB
KeyCount--; {}N* e"<O
} wJ1qJ!s@
} lg&"=VXx51
} =r3Yt9
} !;pmql
V%dMaX>^i
BOOL CHookApp::InitInstance() LPb43
{ FT/H~|Z>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Dd<gYPC
hins=AfxGetInstanceHandle(); ] $$ciFM
InitHotkey(); -WE pBt7*
return CWinApp::InitInstance(); m@.4Wrv
} #l2wF>0
f,d @*E
int CHookApp::ExitInstance() S&]+r<
{ 35) ]R`f
VerifyWindow(); dwv xV$Nt
UnInit(); #p&iH9c_
return CWinApp::ExitInstance(); 91E!4t}I
} e%`gD*8
VvSD&r^qI
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6S])IA&VJ
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Xp1xhb*^
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Zg5@l3w
#if _MSC_VER > 1000 M7Cq)cT
#pragma once :35J<oG
#endif // _MSC_VER > 1000 .^I,C!O#
u]@``Zb|
class CCaptureDlg : public CDialog 8^\DQ&D
{ '|':W6m,
// Construction YTL [z:k}
public: Cq
!VMl>hP
BOOL bTray; 8II-'%S6q
BOOL bRegistered; -0YS$v%au>
BOOL RegisterHotkey(); 0@C`QW%m
UCHAR cKey; g % q7
UCHAR cMask; ppN96-]^0
void DeleteIcon(); 3T# zxu
void AddIcon(); Ayc}uuu
UINT nCount; }/x `w
void SaveBmp(); a^iefwsNc
CCaptureDlg(CWnd* pParent = NULL); // standard constructor %((F}9_6
// Dialog Data 3*CF !Y%
//{{AFX_DATA(CCaptureDlg) & oZI.Qeo
enum { IDD = IDD_CAPTURE_DIALOG }; h\Op|#gIT
CComboBox m_Key; ']u w,b
BOOL m_bControl; YgQ_P4B;
BOOL m_bAlt; } !pC}m
BOOL m_bShift; RSG4A>%!mI
CString m_Path; g (ZeGNV8
CString m_Number; =4\|'V15
//}}AFX_DATA K*'(;1AiW
// ClassWizard generated virtual function overrides 2[[pd&MJZ
//{{AFX_VIRTUAL(CCaptureDlg) }KCXo/y
public: VeA;zq
virtual BOOL PreTranslateMessage(MSG* pMsg); _ p?lRU8
protected: tB &D~M6[
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BEg%u)"([
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `8xmMA_l
//}}AFX_VIRTUAL 3xsC"c>
// Implementation '-D-H}%;}M
protected: :)g=AhBF
HICON m_hIcon; `R!0uRu
// Generated message map functions r,2x?Qi
//{{AFX_MSG(CCaptureDlg) ;s3"j~5m)
virtual BOOL OnInitDialog(); -86 9$
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); REW
*6:
afx_msg void OnPaint(); {b<p~3%+Hc
afx_msg HCURSOR OnQueryDragIcon(); ZUQ1\Iw
virtual void OnCancel(); N1\u~%AT"
afx_msg void OnAbout(); \x(J vDt
afx_msg void OnBrowse(); d5T0#ue/e
afx_msg void OnChange(); )U>q><
//}}AFX_MSG +VdYT6{p
DECLARE_MESSAGE_MAP() ) Y\} ,O
}; # h/-
#endif Rr^<Q:#"<|
r}WV"/]p
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8niQG']
#include "stdafx.h" }z,4IHNn
#include "Capture.h" "#rlL^9v
#include "CaptureDlg.h" 5G_*T
#include <windowsx.h> <&8cq@<
#pragma comment(lib,"hook.lib") 2"'0OQN0\
#ifdef _DEBUG TA`*]*O(
#define new DEBUG_NEW GTYGm
#undef THIS_FILE D(~6h,=m
static char THIS_FILE[] = __FILE__; *=MC+4E
#endif 8/-GrdyE
#define IDM_SHELL WM_USER+1 \kzxt/Ow
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?fnJ`^|-r
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k>K23(X
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g/lv>*+gS
class CAboutDlg : public CDialog ~fAdOh
{ ^ ^}
public: 67 }y/C]<
CAboutDlg(); d{9rEB?
// Dialog Data F{[2|u(4
//{{AFX_DATA(CAboutDlg) [bJ"*^M)
enum { IDD = IDD_ABOUTBOX }; 4eU};Pv
//}}AFX_DATA '@AK0No\W
// ClassWizard generated virtual function overrides 3iV/7~
O
//{{AFX_VIRTUAL(CAboutDlg) ah"2^x
protected: YXg:cXE8e
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _:c8YJEG{
//}}AFX_VIRTUAL <hZA$.W3
// Implementation hNyYk(t^
protected: d7It}7@9
//{{AFX_MSG(CAboutDlg) HzQ6KYAM q
//}}AFX_MSG @-qxNw
DECLARE_MESSAGE_MAP() )!|K3%9
}; w/d9S(
e|):%6#
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2~2
{ @gE
+T37x2
//{{AFX_DATA_INIT(CAboutDlg) ok-sm~ bp
//}}AFX_DATA_INIT R|$=Pfg~4
} }&y>g0$@
m3F.-KPO
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8$v17 3
{ F!|Z_6\tv:
CDialog::DoDataExchange(pDX); HpDU:m
//{{AFX_DATA_MAP(CAboutDlg) @2CYv>
//}}AFX_DATA_MAP l"IBt:
} %Q1v8l.}
R@=ve
%a-
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7xwS
.|
//{{AFX_MSG_MAP(CAboutDlg) BG-uKJ ^
// No message handlers <H}"xp)j0
//}}AFX_MSG_MAP nl*{@R.q @
END_MESSAGE_MAP() #n{wK+lz
_AI2\e
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7Q0M3m
: CDialog(CCaptureDlg::IDD, pParent) H<}<f:
{ /B|#GJ\\3
//{{AFX_DATA_INIT(CCaptureDlg) #c+N}eX{
m_bControl = FALSE; /-^gK^
m_bAlt = FALSE; WE|L{
m_bShift = FALSE; fS1N(RZ1
m_Path = _T("c:\\"); y"cK@sOo
m_Number = _T("0 picture captured.");
SN?jxQ
nCount=0; g}ciG!0
bRegistered=FALSE; xfkG&&
bTray=FALSE; '[qG ,^f
//}}AFX_DATA_INIT 'bY^=9&|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;l4rg!r(S
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]8+%57:E
} Arir=q^2
0Hff/~J
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) H",yVD
{ 73Mh65
CDialog::DoDataExchange(pDX); r$k
*:A$%
//{{AFX_DATA_MAP(CCaptureDlg) 6\4oHRJC
DDX_Control(pDX, IDC_KEY, m_Key); >^|\wy
DDX_Check(pDX, IDC_CONTROL, m_bControl); /y@$|DI1
DDX_Check(pDX, IDC_ALT, m_bAlt); B(Y{
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~M(K{6R
DDX_Text(pDX, IDC_PATH, m_Path); [xO^\oQa=c
DDX_Text(pDX, IDC_NUMBER, m_Number); x"8(j8e
//}}AFX_DATA_MAP mC>7l7%
} Q`5jEtu#,
UQ'D-eK
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %CF(SK2w
//{{AFX_MSG_MAP(CCaptureDlg) -T4?5T_
ON_WM_SYSCOMMAND() C.8]~MP
ON_WM_PAINT() ?.\CUVK
ON_WM_QUERYDRAGICON() 3 c@Cb`w@
ON_BN_CLICKED(ID_ABOUT, OnAbout) k L*Q})
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S;+bQ.
ON_BN_CLICKED(ID_CHANGE, OnChange) *N\U{)b\
//}}AFX_MSG_MAP zclt2?
END_MESSAGE_MAP() j[wGR_EE
wXuHD<<
BOOL CCaptureDlg::OnInitDialog() (W=z0Lqu
{ OjJlGEl w
CDialog::OnInitDialog(); +wD--24!(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ZS >}NN
ASSERT(IDM_ABOUTBOX < 0xF000); &p8K0 |
CMenu* pSysMenu = GetSystemMenu(FALSE); W
qci51y>#
if (pSysMenu != NULL) )P:TVe9`
{ R/ l1$}
CString strAboutMenu; ouVR[w>V
strAboutMenu.LoadString(IDS_ABOUTBOX); kn+`2-0
if (!strAboutMenu.IsEmpty()) +c}fDrr)
{ T>vH ZZiO
pSysMenu->AppendMenu(MF_SEPARATOR); Nf-IDK
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9y.C])(2
} tz1iabZ{
} .Ks&r
SetIcon(m_hIcon, TRUE); // Set big icon \w^U<_zq
SetIcon(m_hIcon, FALSE); // Set small icon qa`bR%eH
m_Key.SetCurSel(0); NZ7a^xT_)
RegisterHotkey(); /}#z/m@bN
CMenu* pMenu=GetSystemMenu(FALSE); ofcoNLX5c
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #`y7L4V*o
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6dC!&leNi
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qIA!m
.GC
return TRUE; // return TRUE unless you set the focus to a control f
IQ$a>
} :E4i@ O7%
sw{EV0&>m
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D~NH 4B
{ dfc-#I
p?
if ((nID & 0xFFF0) == IDM_ABOUTBOX) FEU$D\1y
{ ,dzbI{@6
CAboutDlg dlgAbout; 78dmXOZ'_h
dlgAbout.DoModal(); (zk'i13#6
} Sh2q#7hf
else >,uof ?
{ Xw9,O8}C7
CDialog::OnSysCommand(nID, lParam); e)!X9><J
} A ;Z%-x
} qZ`@Ro
kj@#oLd%
void CCaptureDlg::OnPaint() Qs#v/r
{ ^a<=@0|
if (IsIconic()) CM9+h;Zm
{ &>L\unS
CPaintDC dc(this); // device context for painting ,o*b-Cv/
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $'?CY)h{
// Center icon in client rectangle YCw^u
int cxIcon = GetSystemMetrics(SM_CXICON); Be8Gx
int cyIcon = GetSystemMetrics(SM_CYICON); @8n0GCv
CRect rect; Tk.MtIs)V}
GetClientRect(&rect); !G`w@E9M)
int x = (rect.Width() - cxIcon + 1) / 2; 2ZIf@C{P.
int y = (rect.Height() - cyIcon + 1) / 2; .Zf#L'Rf
// Draw the icon 8Nc i1o
dc.DrawIcon(x, y, m_hIcon); ` mALx! `
} qL A
else F ypqf|
{ MI',E?#yB
CDialog::OnPaint(); 4\Y=*X
} [RC|W%<Z>
} ~z32%k
>=C)\Yfu)
HCURSOR CCaptureDlg::OnQueryDragIcon() XRP/E_4
{ 7D9R^\K
return (HCURSOR) m_hIcon; r-4I{GPb
} 0 I;>du
"9kEqz4a
void CCaptureDlg::OnCancel() |06J4H~k
{ zrnc~I+
if(bTray) asPD>j c
DeleteIcon(); 4J94iI>S.l
CDialog::OnCancel(); jDH)S{k
} I`Rxijz
RM%lhDFY
void CCaptureDlg::OnAbout() PeTA:MW
{ 6Oo'&3@
CAboutDlg dlg; rUx%2O|qu
dlg.DoModal(); 6JK;]Ah
} tC|5;'m.2
jWP(7}U
void CCaptureDlg::OnBrowse() %[NefA(
{ ~a/yLI"'g
CString str; aASnk2DFd
BROWSEINFO bi; Y`lC4*g
char name[MAX_PATH]; b!7"drge:
ZeroMemory(&bi,sizeof(BROWSEINFO)); $JX_e
bi.hwndOwner=GetSafeHwnd(); #i)h0ML/e
bi.pszDisplayName=name; >OiC].1
bi.lpszTitle="Select folder"; Eq'{uV:
bi.ulFlags=BIF_RETURNONLYFSDIRS; \ZCc~muR
LPITEMIDLIST idl=SHBrowseForFolder(&bi); v6oZD;;~
if(idl==NULL) j}0*`[c
return; [gQ~B1O
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \% ^<Ll
str.ReleaseBuffer(); fFSW\4JD=
m_Path=str; !H?#~{
W}
if(str.GetAt(str.GetLength()-1)!='\\') (">!vz
m_Path+="\\"; DPy"FQYZb
UpdateData(FALSE); 9dKrE_zK:
} atl0#F Bd
!u4oo-
void CCaptureDlg::SaveBmp() "8{u_+_B*
{ ^IQC:21
CDC dc; dzbzZ@y
dc.CreateDC("DISPLAY",NULL,NULL,NULL); D5AKOM!`
CBitmap bm; Y*J`Wf(w
int Width=GetSystemMetrics(SM_CXSCREEN); ly,d =
int Height=GetSystemMetrics(SM_CYSCREEN); !t;$n!7<
bm.CreateCompatibleBitmap(&dc,Width,Height); (qB$I\
CDC tdc; $lV0TCgba8
tdc.CreateCompatibleDC(&dc); N15{7,
CBitmap*pOld=tdc.SelectObject(&bm); \Sm.]=br
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QD"V=}'?
tdc.SelectObject(pOld); n:k~\-&WJ
BITMAP btm; ,`-6!|:
bm.GetBitmap(&btm); '%K,A-7W
DWORD size=btm.bmWidthBytes*btm.bmHeight; eJ7A.O
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); u!{P{C
BITMAPINFOHEADER bih; )5yZSdA
bih.biBitCount=btm.bmBitsPixel; {u9VHAXCf
bih.biClrImportant=0; }Qg9l|
bih.biClrUsed=0; 9"MC<
bih.biCompression=0; }.`ycLW'
bih.biHeight=btm.bmHeight; p|AIz3
bih.biPlanes=1; j##IJm
bih.biSize=sizeof(BITMAPINFOHEADER); %) q5hB
bih.biSizeImage=size; LvW9kL+WiQ
bih.biWidth=btm.bmWidth; `n5|4yaG~
bih.biXPelsPerMeter=0; (A( d]l
bih.biYPelsPerMeter=0; i]F,Y;&|
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $!KV]]
static int filecount=0; Cww$ A %}
CString name; fE_QB=9 cz
name.Format("pict%04d.bmp",filecount++); \[Rh\v&
name=m_Path+name; 5QMu=/
BITMAPFILEHEADER bfh; q]
,&$d^@
bfh.bfReserved1=bfh.bfReserved2=0; 4-cnkv\~
bfh.bfType=((WORD)('M'<< 8)|'B'); 4[+n;OI
bfh.bfSize=54+size; y4M<L. RO
bfh.bfOffBits=54; CS6,mX
CFile bf; r 97 VX>
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ M^+~r,D1u
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *qKwu?]?>
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M}M.
bf.WriteHuge(lpData,size); 6,s@>8n
bf.Close(); FV:{lC{h~
nCount++; 52-^HV
} _=4Dh/Dv
GlobalFreePtr(lpData); R.>/%o
if(nCount==1) E: XzX Fxx
m_Number.Format("%d picture captured.",nCount); oOQnV(I
else h}+,]^
m_Number.Format("%d pictures captured.",nCount); (lEWnf=2h
UpdateData(FALSE); ~Bj-n6 QDE
} eMWY[f3
f9OVylm
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m}F1sRkdQ
{ Ep?a1&b
if(pMsg -> message == WM_KEYDOWN) S/7D}hJ
{ L>pP3[~DV
if(pMsg -> wParam == VK_ESCAPE) GytI_an8
return TRUE; 1VJE+3
if(pMsg -> wParam == VK_RETURN) ab3" ?.3m
return TRUE; .hT^7|Jz[
} I uhyBo
return CDialog::PreTranslateMessage(pMsg); T[ky7\
} y .
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uOm fpg O
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ilzR/DJ Ma
{ rQ~%SUM7
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ I#$u(2.H
SaveBmp(); B>9D@fmzs
return FALSE; _0Wdm*
} H(n_g
QAX
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :Wb+&|dU
CMenu pop; KOwEw~
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @8V8gV?zm
CMenu*pMenu=pop.GetSubMenu(0); +Uj~zx@
pMenu->SetDefaultItem(ID_EXITICON); !X
|Tf
CPoint pt; I /> .P
GetCursorPos(&pt); ){8^l0b
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kk^KaD4dA
if(id==ID_EXITICON) ]9b*!n<z
DeleteIcon(); q#MAA_
else if(id==ID_EXIT) p?6w/ n
OnCancel(); P#76ehR]K
return FALSE; Lo9+#ITyx
} ydoCoD
w
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3#5sj >
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `?`\!uP"
AddIcon(); >f}rM20Vm
return res; +O\6p
} !U=;e ?o
|bB..b
void CCaptureDlg::AddIcon() lD 9'^J
{ <qv:7@
NOTIFYICONDATA data; UI hB
data.cbSize=sizeof(NOTIFYICONDATA); >/evL
/
CString tip; LH0\SmhU
tip.LoadString(IDS_ICONTIP); ^Z2%b>
data.hIcon=GetIcon(0); H:p(C?tk{
data.hWnd=GetSafeHwnd(); 2nOQ48haT
strcpy(data.szTip,tip); [+ 1([#
data.uCallbackMessage=IDM_SHELL; uXtfP?3Vy
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [(UQQa=+
data.uID=98; l3(k
Shell_NotifyIcon(NIM_ADD,&data); zBqr15
ShowWindow(SW_HIDE); #YjV3O5<
bTray=TRUE; ,!u^E|24
} Z#^2F8,]
^c.b@BE
void CCaptureDlg::DeleteIcon() e|]g?!
{ >TK`s@jdSV
NOTIFYICONDATA data; 42Ql^ka
data.cbSize=sizeof(NOTIFYICONDATA); 574b]
data.hWnd=GetSafeHwnd(); ,]20I _
data.uID=98; z?FZu,h}
Shell_NotifyIcon(NIM_DELETE,&data); WET $H,
ShowWindow(SW_SHOW); r\_aux^z
SetForegroundWindow(); @{XN}tWDOp
ShowWindow(SW_SHOWNORMAL); 'Y>!xm
bTray=FALSE; GTJ\APrH
} %xWmzdn
vWzNsWPK"{
void CCaptureDlg::OnChange() ~5]AXi'e~
{ P),%S9jP;
RegisterHotkey(); T73saeN
} x"U/M?l
4zfgtg(
BOOL CCaptureDlg::RegisterHotkey() E39:}_IV
{ )mwY]
!
UpdateData(); vad" N
UCHAR mask=0; !YAkHrF`[0
UCHAR key=0; +Y 3_)
if(m_bControl) h'T\gF E%
mask|=4; iHQFieZ.E
if(m_bAlt) 2ZLK`^S
mask|=2; h-!(O^M
if(m_bShift) [o|]>(tk
mask|=1; 5p"*nkF
key=Key_Table[m_Key.GetCurSel()]; 2NE/ZqREg
if(bRegistered){ #v~zf@<KLB
DeleteHotkey(GetSafeHwnd(),cKey,cMask); "B)DX*-\?
bRegistered=FALSE; XwlUkw"q
} ^JYR^X>_
cMask=mask; F fl`;M
cKey=key; |(y6O5Y.
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TX;OA"3=\-
return bRegistered; o&I0*~sN
} 9H P)@66
vR+(7^Yy
四、小结 ilFM+x@
APK@Oq
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。