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:
s/PhXf\MN
2i"HqAB 一、实现方法
6*V8k%H }2mI*"%)\u 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:
GM77Z.Y Q.>/*8R; #pragma data_seg("shareddata")
5d(qtFH1 HHOOK hHook =NULL; //钩子句柄
ef,F[-2^o UINT nHookCount =0; //挂接的程序数目
Ki63Ox^O static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
^K/G 5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
ofl'G] /$+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
>Ban?3{ static int KeyCount =0;
l)%mqW% static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
T&!ZD2I #pragma data_seg()
LAos0bc)w\ .c|9..Cq= 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
pbFYiu+ 2\,e DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
CY5w$E wU.'_SBfB BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
xLZMpP5c cKey,UCHAR cMask)
@,GjeF]! {
.2/,XwIr BOOL bAdded=FALSE;
!b'IfDp[-! for(int index=0;index<MAX_KEY;index++){
^} tLnF if(hCallWnd[index]==0){
wyNC|P;j$g hCallWnd[index]=hWnd;
=}"R5 HotKey[index]=cKey;
"W3W:vl! HotKeyMask[index]=cMask;
&6Ns7w6*z bAdded=TRUE;
:K:f^o]s KeyCount++;
jB` 7T^bU break;
a&8l[xe1 }
q'by;g*m }
([1=> Jw" return bAdded;
aDXpkG0E }
i{P%{hVb //删除热键
kO jEY BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+fPNen4E {
` v>/
BOOL bRemoved=FALSE;
eC.w?(RB for(int index=0;index<MAX_KEY;index++){
@{'o#EJY if(hCallWnd[index]==hWnd){
x}_rnf_ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.:T9pplq hCallWnd[index]=NULL;
\?r$&K]4 HotKey[index]=0;
a4:`2 HotKeyMask[index]=0;
&bn*p.=G bRemoved=TRUE;
QaIi.*tic KeyCount--;
>Sh0dFqeT break;
;r%<2( }
2NyUmJ42 }
EQ6l:[ }
icU"Vyu return bRemoved;
c
3}x)aQ }
cgzy0$8dj\ L,O>6~9:^1 ]X/O IfdWe DLL中的钩子函数如下:
vi^z5n >'ie!VW@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
f(^33k {
^NY+wR5Sn BOOL bProcessed=FALSE;
<\+Po<)3j if(HC_ACTION==nCode)
fmtuFr^a1 {
y Y'gx|\ if((lParam&0xc0000000)==0xc0000000){// 有键松开
pb~Ps#"Zg switch(wParam)
/7.wQeL9 {
is64)2F]( case VK_MENU:
#)Ep(2 MaskBits&=~ALTBIT;
PpW
A
f\ break;
RA!x case VK_CONTROL:
L,f^mX0< MaskBits&=~CTRLBIT;
D`1I;Tb# break;
Ml'bZLwq case VK_SHIFT:
loml.e=87 MaskBits&=~SHIFTBIT;
rve7YS' break;
$_ST:h&C default: //judge the key and send message
" vv$%^ break;
'\Qf,%%. }
[O.LUR; for(int index=0;index<MAX_KEY;index++){
\x3^ if(hCallWnd[index]==NULL)
u!hqq^1 continue;
kt;}]O2%R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?aP1 {
Iz 1*4@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?psOj% bProcessed=TRUE;
]!n*V/g }
R~U2/6V }
]|H]9mys98 }
y.L|rRe@P else if((lParam&0xc000ffff)==1){ //有键按下
Wh#os,U$ switch(wParam)
V22q*/iV {
Uh<H*o6e 9 case VK_MENU:
dw|-=~ MaskBits|=ALTBIT;
DMy4"2
o break;
B7NmET4 case VK_CONTROL:
Lr!L}y9T+ MaskBits|=CTRLBIT;
s?4%<jz break;
de3yP, case VK_SHIFT:
J R8 Z6 MaskBits|=SHIFTBIT;
H[>klzh6
! break;
%#[r_QQ^ default: //judge the key and send message
;mCGh~?G break;
+OV%B . }
l:>qR/|m for(int index=0;index<MAX_KEY;index++){
"~.8eKRQ if(hCallWnd[index]==NULL)
g?k#wj1uH continue;
,Y78Q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w*|= k~z {
sDz)_;;% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
r4]hS`X~% bProcessed=TRUE;
mtiO7w"M\7 }
'lQ }
3j[w
-Lfp }
#n6FQ$l8m if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
*y":@T for(int index=0;index<MAX_KEY;index++){
%[+a[/ if(hCallWnd[index]==NULL)
4GmSG,] continue;
4]|9!=\
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
~ wJ3AqNC? SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
wj5qQ]WC //lParam的意义可看MSDN中WM_KEYDOWN部分
2zmQp }
mR!&.R? }
b |o`Q7Hj }
yg-L^`t+B5 return CallNextHookEx( hHook, nCode, wParam, lParam );
%zIl_/s }
S'v V" y \mutm 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
a:(: :m "(HA9: BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
|wyJh"4!
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
ba1$kU l,^i5t' 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:
8Izn'>" V PLCic,T LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
b7>,-O {
[qjAq@@N#q if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
B6Wq/fl/ {
aHVdClD2o //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
2Be ?5+ SaveBmp();
JsWq._O{/ return FALSE;
W>t&N }
1DI"LIL …… //其它处理及默认处理
R9|2&pfm(M }
3_R 3<~2"@J QTrlQH&p 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。
3& fIO /z.7:<gZ( 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。
{8*d;[X50 [EW$7 se~ 二、编程步骤
)$Dcrrj N c&i) qh 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";
y. ivz &?5{z\;1" 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
6S&=OK^ g~$GE},, 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
@FnI?Rx Ok~W@sYST 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
7B:ZdDj :+?W 5、 添加代码,编译运行程序。
yjM@/b vS24;:f 三、程序代码
cA (e"N +|}K5q \ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
#<PA-
y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
#?b^B~ # #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
&[2Ej|o #if _MSC_VER > 1000
x(/@Pt2B #pragma once
SceCucT #endif // _MSC_VER > 1000
6yl;o_6: #ifndef __AFXWIN_H__
)68fm\t( #error include 'stdafx.h' before including this file for PCH
ou,=MpXx* #endif
8y4D9_{ #include "resource.h" // main symbols
-'p@ lk class CHookApp : public CWinApp
gw~em {
r
PRuSk-f public:
h^ecn-PC CHookApp();
E;GR;i{t // Overrides
w?$u! X // ClassWizard generated virtual function overrides
/qz "I-a //{{AFX_VIRTUAL(CHookApp)
|au qj2 public:
>kDdWgRQ virtual BOOL InitInstance();
4W//Oc@e virtual int ExitInstance();
XnI
;7J //}}AFX_VIRTUAL
wMPw/a; //{{AFX_MSG(CHookApp)
X\$W'^ np // NOTE - the ClassWizard will add and remove member functions here.
;KZtW // DO NOT EDIT what you see in these blocks of generated code !
BHJ'[{U*w //}}AFX_MSG
sY;gh`4h DECLARE_MESSAGE_MAP()
V^$rH< };
v(Zi;?c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
{i%xs#0h BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
%3l;bR> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
^Mvsq) BOOL InitHotkey();
1f pS"_} BOOL UnInit();
D8D!1 6_ #endif
+^&v5[$R ";S*[d.2tA //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
=`\,2Nb #include "stdafx.h"
b#I*~ #include "hook.h"
vo( j@+dz #include <windowsx.h>
?lwQne8/ #ifdef _DEBUG
kj3o1 Y #define new DEBUG_NEW
y'2kV6TtqD #undef THIS_FILE
M6hvi(!X2 static char THIS_FILE[] = __FILE__;
:@@A #endif
1-NX>E5 #define MAX_KEY 100
D>7_P7]y #define CTRLBIT 0x04
l;Wy,?p #define ALTBIT 0x02
,<P[CUD&& #define SHIFTBIT 0x01
ssJDaf79 #pragma data_seg("shareddata")
sc $QbO c HHOOK hHook =NULL;
zyp"*0zUr UINT nHookCount =0;
72`/xryY static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
#L IsL static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
k'I_,Z<, static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
/E4 }d=5L static int KeyCount =0;
Z/05 wB static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
3Gd&=IJ #pragma data_seg()
^3)2]>pW HINSTANCE hins;
(~pEro]?+) void VerifyWindow();
61rh\<bn BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
*"QE1Fum' //{{AFX_MSG_MAP(CHookApp)
>5@vY?QXO // NOTE - the ClassWizard will add and remove mapping macros here.
$@qs(Xwr // DO NOT EDIT what you see in these blocks of generated code!
%M,d/4=P //}}AFX_MSG_MAP
!E:Vn *k; END_MESSAGE_MAP()
,fG_'3wb =Wy`X0h CHookApp::CHookApp()
!
7*_Z= {
J_[[BJ&}x // TODO: add construction code here,
]zq_gV8k // Place all significant initialization in InitInstance
Nj-rZ%& }
c.{&~ Nb!6YY=Ez- CHookApp theApp;
;7n*PBUJJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ocuVDC {
UrcN? BOOL bProcessed=FALSE;
!>2\OSp! if(HC_ACTION==nCode)
v{{2<,l {
hYUV9k: if((lParam&0xc0000000)==0xc0000000){// Key up
73z|'0. switch(wParam)
vwH7/+ {
>eTgP._ case VK_MENU:
oJJk MaskBits&=~ALTBIT;
]vkHU6d break;
.f<VmUca case VK_CONTROL:
HJ1\FO9\ MaskBits&=~CTRLBIT;
+$QL0|RL break;
=U7D}n
hS- case VK_SHIFT:
9H%xZ(`vN MaskBits&=~SHIFTBIT;
(DMnwqr break;
hUhp2ibEs default: //judge the key and send message
j% USu+& break;
O9=H
[b }
p,u<gJUL for(int index=0;index<MAX_KEY;index++){
;$L!`"jn if(hCallWnd[index]==NULL)
|Sv #f2` continue;
2d;xAX ] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PW//8lsR {
>Wit"p SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Qp{-!* bProcessed=TRUE;
6ym)F!t8l }
s&`XK$p
}
hG;=ci3EE }
y'O{8Q8T else if((lParam&0xc000ffff)==1){ //Key down
.QQI~p0: switch(wParam)
t{s*3k/ {
g7z9i[ case VK_MENU:
JR<-'
MaskBits|=ALTBIT;
.d!*<`S| break;
n9/0W%X> case VK_CONTROL:
<.(/#=2 MaskBits|=CTRLBIT;
z slEUTj) break;
u&_U
CJCf case VK_SHIFT:
j4SGA#;v MaskBits|=SHIFTBIT;
Bt7v[Ot
break;
A^@ <+? default: //judge the key and send message
L.:QI<n break;
_%TeTNY# }
EEZ2Gu6c for(int index=0;index<MAX_KEY;index++)
)9 jQ_ {
/ lM~K: if(hCallWnd[index]==NULL)
6Oba}`)q9 continue;
8 (h if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^QQNJ {
sK/" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
i6:yNb =' bProcessed=TRUE;
DF|lUO]: }
"EhO )lR }
}~'Wz*Gm }
"}+/0$F if(!bProcessed){
;L%~c4`l~m for(int index=0;index<MAX_KEY;index++){
|B$\3, if(hCallWnd[index]==NULL)
A y[L{!)2{ continue;
KmOa^vY1.T if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
xLK0~|_#! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
'R'a/ZR`B7 }
j4r,_lH^r }
-86:PL(I" }
FF!g9> return CallNextHookEx( hHook, nCode, wParam, lParam );
$cU/Im`
}
R,+(JgJ Byj~\QMD| BOOL InitHotkey()
rK) {
pP,bW~rk if(hHook!=NULL){
YY~=h5$ nHookCount++;
`#8R+c=$ return TRUE;
OT3;qT*fw }
* .VZ(wX else
1+}Ud.v3VW hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
~'.yhPog if(hHook!=NULL)
Fh$&puF2 nHookCount++;
9?$!=4 return (hHook!=NULL);
RAbq_^Q }
%<|KJb4? BOOL UnInit()
X2?_lZ[\ {
a`iAA1HJ if(nHookCount>1){
W(4?#lA2W nHookCount--;
"q/M8 return TRUE;
AV3,4u }
>!.9g BOOL unhooked = UnhookWindowsHookEx(hHook);
|bnjC $b * if(unhooked==TRUE){
<XrGr5=BV nHookCount=0;
}c5`~ LLK hHook=NULL;
#zs\Z]3# }
VVl-cU return unhooked;
NWK_(=n }
,x.)L=Cx8 A_|FsQ6$P BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ta.,4R&K {
F]#fl% BOOL bAdded=FALSE;
gSYX @'Q! for(int index=0;index<MAX_KEY;index++){
h18y?e7MU if(hCallWnd[index]==0){
}l!_m.#e hCallWnd[index]=hWnd;
0N ;d)3 HotKey[index]=cKey;
i]?xM2(N HotKeyMask[index]=cMask;
17MjIX bAdded=TRUE;
Qo *]l_UO; KeyCount++;
vGT.(:\-, break;
kk+8NwM1 }
C~V$G}mM }
m
kf{_!TK return bAdded;
PzDgl6C }
c (8J Lo9?,^S BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Vnb#N4vR {
3[Iw%% q BOOL bRemoved=FALSE;
AB\4+ CLV for(int index=0;index<MAX_KEY;index++){
n5>N9lc if(hCallWnd[index]==hWnd){
\hN2w]e if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
RhmVHhj hCallWnd[index]=NULL;
!#qB%E]a HotKey[index]=0;
uZI a-b HotKeyMask[index]=0;
N&`ay{&`: bRemoved=TRUE;
UOOme)\> KeyCount--;
:XZ
pnjj break;
:zRboqe(cc }
hz<J8'U }
eCd?.e0@j }
D/UGN+ return bRemoved;
_I4sy=tYXK }
q:.BY}X9 >K%x44| void VerifyWindow()
=T$- #bA) {
]#n4A|&H for(int i=0;i<MAX_KEY;i++){
NLY5L7 if(hCallWnd
!=NULL){ K_n%`5
if(!IsWindow(hCallWnd)){ |Wk
G='02
hCallWnd=NULL; mu sxX58%
HotKey=0; 64fG,b
HotKeyMask=0; -m/4\D
KeyCount--; qDAjW)w
Jp
} T<)z2Bi
} PM7/fv*,
} 9 To6Rc;
} "QS7?=>*F
||aU>Wj4
BOOL CHookApp::InitInstance() >,3
3Jx
{ xK3;/!\`
AFX_MANAGE_STATE(AfxGetStaticModuleState()); !d(V7`8
hins=AfxGetInstanceHandle(); d*L'`BBsp
InitHotkey(); 1[^d8!U
return CWinApp::InitInstance(); dZmq
} y>8?RX8
q3`t0eLZ
int CHookApp::ExitInstance() o:<3n,T
{ ^dv>n]?
VerifyWindow(); 7<D_ h/WV
UnInit(); y{JkY\g
return CWinApp::ExitInstance(); F}>`3//u
} v*3:8Y,
~vmY2h\
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )
|vFrR
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) soF ^G21N
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ qv6]YPP
#if _MSC_VER > 1000 ^iNR(cwgX
#pragma once uk,f}Xc
#endif // _MSC_VER > 1000 =xoTH3/,>
7|rT*-Ia
class CCaptureDlg : public CDialog X6RM2
{ . {I7sUQ
// Construction =%LS9e^7D
public: Gj=il-Po
BOOL bTray; Ry C7
BOOL bRegistered; bxs@_fH
BOOL RegisterHotkey(); STe;Sr&p
UCHAR cKey; AI2CfH#:C
UCHAR cMask; V 6F,X`7
void DeleteIcon(); TL>e[PBO
void AddIcon(); _qV_(TpS+
UINT nCount; V QI7lJV"
void SaveBmp(); ;G$FLL1
CCaptureDlg(CWnd* pParent = NULL); // standard constructor yrw!b\
// Dialog Data #'qW?8d}
//{{AFX_DATA(CCaptureDlg) _wBPn6gg`
enum { IDD = IDD_CAPTURE_DIALOG }; ,P^"X5$
CComboBox m_Key; &D:88
BOOL m_bControl; R)/w
BOOL m_bAlt; v;SJgZK
BOOL m_bShift; 8J} J;Ga
CString m_Path; M4| L
CString m_Number; e
6*=Si}V
//}}AFX_DATA *3|KbCX
// ClassWizard generated virtual function overrides NQmDm!-4
//{{AFX_VIRTUAL(CCaptureDlg) zx27aZ[
public: 3?:}lY<,
virtual BOOL PreTranslateMessage(MSG* pMsg); \;}dSSB1
protected: "T PMSx&Ei
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o%:eYl
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); g:HIiGN0Ic
//}}AFX_VIRTUAL 2sngi@\
// Implementation 6o!"$IH4
protected: ^IpS 3y
HICON m_hIcon; mYCGGwD
// Generated message map functions \ CYu;
//{{AFX_MSG(CCaptureDlg) 4"{q|~&=:$
virtual BOOL OnInitDialog(); b> |oU
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -Db(
afx_msg void OnPaint(); g(1'i 1
afx_msg HCURSOR OnQueryDragIcon(); Uu
,Re
virtual void OnCancel(); ~c4Y*]J
afx_msg void OnAbout(); Ae1},2py
afx_msg void OnBrowse(); "'%x|nB
afx_msg void OnChange(); xfb%bkr
//}}AFX_MSG J#\/znT
DECLARE_MESSAGE_MAP() ~jgd92`{z
}; V;$lgTs|'
#endif wjkN%lPfvj
p~t$ll0s
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rie1F,
#include "stdafx.h" \C#Vh7z"2&
#include "Capture.h" 4_$f"6
#include "CaptureDlg.h" AWw:N6\
#include <windowsx.h> 7\.5G4dr%
#pragma comment(lib,"hook.lib") grZN.zTO
#ifdef _DEBUG yt?#T#
#define new DEBUG_NEW X]N8'Yt
#undef THIS_FILE h<?Vzl
static char THIS_FILE[] = __FILE__; Q,>AT$|
#endif mWZVO,t$
#define IDM_SHELL WM_USER+1 A/9 w r
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7JbN WN
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #VLTx!5o
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,\VNs'j
class CAboutDlg : public CDialog 3 Tt8#B
{ k7j;'6
public: 56fcifXz@
CAboutDlg(); >d=k-d
// Dialog Data !+i
//{{AFX_DATA(CAboutDlg) {9(N?\S1`a
enum { IDD = IDD_ABOUTBOX }; o^Ms(?K%t
//}}AFX_DATA a}6Wo=
// ClassWizard generated virtual function overrides [K^RC;}nV^
//{{AFX_VIRTUAL(CAboutDlg) 'INdZ8j_
protected: cEe>Lyt
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kc}e},k
//}}AFX_VIRTUAL VP[ J#TPU
// Implementation zzM 'uo
protected: /MA4Er r
//{{AFX_MSG(CAboutDlg) .2`S07Z
//}}AFX_MSG s+aeP
DECLARE_MESSAGE_MAP() ;:v:pg8qc
}; d35 ,[
%GJ,&b|
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?]:3`;h3
{ }nkX-PG9
//{{AFX_DATA_INIT(CAboutDlg) )H)HR`
//}}AFX_DATA_INIT }psJ'aiG*
} .Ir 5gz
=V(I
void CAboutDlg::DoDataExchange(CDataExchange* pDX) d>2>mT$U
{ f"z96{zo
CDialog::DoDataExchange(pDX); Y}PI{PN
//{{AFX_DATA_MAP(CAboutDlg) )8yNqnD
//}}AFX_DATA_MAP B&cC;Hw
} r.[9/'>
O>UR\l|+:2
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) fxjs"rD5
//{{AFX_MSG_MAP(CAboutDlg) %{axoGd
// No message handlers A%pcPzG;
//}}AFX_MSG_MAP XJGOX
n$/
END_MESSAGE_MAP() 4~D?F'o
d&F8nBIM5
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~i(X{^,3
: CDialog(CCaptureDlg::IDD, pParent) ~qs97'
{ 4\>Cnc{
//{{AFX_DATA_INIT(CCaptureDlg) O",:0<
m_bControl = FALSE; 3#W>
m_bAlt = FALSE; 2-FL&DE
m_bShift = FALSE; ;:f.a(~c
m_Path = _T("c:\\"); ;8H
m#p7,
m_Number = _T("0 picture captured."); 7&E3d P
nCount=0; %6L{Z *(
bRegistered=FALSE; ,'[0tl}8K
bTray=FALSE; >A#]60w.
//}}AFX_DATA_INIT @jX[Ho0W'
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .#@*)1A#t
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); bP(xMw<'j
} &;|/I`+
Fc{hzqaP8
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6Wl+5
a6V
{ PE0A `
CDialog::DoDataExchange(pDX); (]1n!
//{{AFX_DATA_MAP(CCaptureDlg)
LGV"WE
DDX_Control(pDX, IDC_KEY, m_Key); VD,g
DDX_Check(pDX, IDC_CONTROL, m_bControl); n)gzHch
DDX_Check(pDX, IDC_ALT, m_bAlt); ) m[0,
DDX_Check(pDX, IDC_SHIFT, m_bShift); $)mK]57
DDX_Text(pDX, IDC_PATH, m_Path); ]7eQ5[5s
DDX_Text(pDX, IDC_NUMBER, m_Number); 5?{a=r9
//}}AFX_DATA_MAP V^[o{'+
} hIE$u t +
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)
\}Z5}~S
//{{AFX_MSG_MAP(CCaptureDlg) IZ/+RO n
ON_WM_SYSCOMMAND() [td)v,
ON_WM_PAINT() -)PQ&[
ON_WM_QUERYDRAGICON() Hz `aj
ON_BN_CLICKED(ID_ABOUT, OnAbout) ^fa+3`>
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7E6gXf.
ON_BN_CLICKED(ID_CHANGE, OnChange) x=(Q$Hl5
//}}AFX_MSG_MAP /^SIJS@^`>
END_MESSAGE_MAP() To.CY^M
"k[-eFz/@M
BOOL CCaptureDlg::OnInitDialog() . _Bejh
{ *F[@lY\p
CDialog::OnInitDialog(); 1YL6:5n
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8c3Qd
ASSERT(IDM_ABOUTBOX < 0xF000); q#$Al
CMenu* pSysMenu = GetSystemMenu(FALSE); A!\g!*
if (pSysMenu != NULL) gs7h`5[es
{ Dyyf%'\M
CString strAboutMenu; Wxx?iW ,
strAboutMenu.LoadString(IDS_ABOUTBOX); {26/SY
if (!strAboutMenu.IsEmpty()) Bvb.N$G
{ E<y0;l?H<
pSysMenu->AppendMenu(MF_SEPARATOR); u_shC"X:
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B&3oo
} G(" S6u
} xEb+sE6Z
SetIcon(m_hIcon, TRUE); // Set big icon MOi.bHCQJP
SetIcon(m_hIcon, FALSE); // Set small icon %ukFn
&-2@
m_Key.SetCurSel(0); n]S
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RegisterHotkey(); 5[suwaJQ
CMenu* pMenu=GetSystemMenu(FALSE); MEf`&<t
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M{w[hV
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `lygJI?H+{
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FxeDjAP
return TRUE; // return TRUE unless you set the focus to a control e)"]H*
} ?NkweT(
l];w,(u{
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q$x$ 4
{ ,rc?,J1l
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Jr+~'
{ >>22:JI`
CAboutDlg dlgAbout; kV9S+ME
dlgAbout.DoModal(); :p%G+q2
} 8`~M$5!
else Jas=D
{ FOz~iS\
CDialog::OnSysCommand(nID, lParam); ;aXu
} $=3&qg"!
} 7/C,<$Ep
/Y|y0iK
void CCaptureDlg::OnPaint() 4IfOvAN%
{ RrB)u?
if (IsIconic()) P5-1z&9O
{ 0se0AcrW
CPaintDC dc(this); // device context for painting x\0(l5>
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zB/#[~
// Center icon in client rectangle }(tuBJ9
int cxIcon = GetSystemMetrics(SM_CXICON); nwSujD
int cyIcon = GetSystemMetrics(SM_CYICON); <j\osw1R
CRect rect; max 5s$@
GetClientRect(&rect); TNun)0p
int x = (rect.Width() - cxIcon + 1) / 2; +pMa-{
int y = (rect.Height() - cyIcon + 1) / 2; Zfwhg4G~
// Draw the icon k+qxx5{
dc.DrawIcon(x, y, m_hIcon); F9h'.{@d
} J5Pi"U$FkY
else 1V?)T
{ q+<<Ku(20
CDialog::OnPaint(); n/]w!
} $FR1^|P/G
} Jzu U
k
o9GtS$O\
HCURSOR CCaptureDlg::OnQueryDragIcon() 9rD6."G
{ 3X|7 R
return (HCURSOR) m_hIcon; j:k}6]p}
} 5~8FZ-x
<=O/_Iu(
void CCaptureDlg::OnCancel() sVzU>
{ MX*T.TG8
if(bTray) /w[B,_ZKTk
DeleteIcon(); "&9L
CDialog::OnCancel(); n{Ce%gy
} uO]^vP]fT
7
k:w3M
void CCaptureDlg::OnAbout() U-h'a:
K
{ |aWeo.;c
CAboutDlg dlg; *aem5E`c
dlg.DoModal(); r [NI#wW
} {Tr5M o
ko7*9`
void CCaptureDlg::OnBrowse() [l`_2{:
{ >{/As][
CString str; lRO7 Ae
BROWSEINFO bi; %KjvV<f-a
char name[MAX_PATH]; :6h$1
+6
ZeroMemory(&bi,sizeof(BROWSEINFO));
WRdBL5
bi.hwndOwner=GetSafeHwnd(); $~^Y4 }
m
bi.pszDisplayName=name; <t~RGn3
bi.lpszTitle="Select folder"; k 'CM^,F&
bi.ulFlags=BIF_RETURNONLYFSDIRS; O4c[,Uq8~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 85{2TXQ^%=
if(idl==NULL) Nd;)V
return; lhk=yVG3
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8?yRa{'"
str.ReleaseBuffer(); ox|K2A
m_Path=str; `S)*(s?T
if(str.GetAt(str.GetLength()-1)!='\\') sLHUQ(S!
m_Path+="\\"; n PAl8
UpdateData(FALSE); l^~E+F~
} ;~^9$Z@%Q
r}>q*yx:
void CCaptureDlg::SaveBmp() Tr\6AN?o
{ BdMmeM2h
CDC dc; n "J+?~9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); !EwL"4pPw
CBitmap bm; :Qc[>:N
int Width=GetSystemMetrics(SM_CXSCREEN); @3aI7U/I
int Height=GetSystemMetrics(SM_CYSCREEN); NP+*L|-;
bm.CreateCompatibleBitmap(&dc,Width,Height); C<G`wXlP|
CDC tdc; O,D/&0
tdc.CreateCompatibleDC(&dc); \c1NIuJR
CBitmap*pOld=tdc.SelectObject(&bm); 178u4$# b
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :6T8\W
tdc.SelectObject(pOld); AcoU.tpP
BITMAP btm; iHYvH
bm.GetBitmap(&btm); RX"~m!26
DWORD size=btm.bmWidthBytes*btm.bmHeight; <w1#3Mu'
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +t8{aaV
BITMAPINFOHEADER bih; pBR9)T\n
bih.biBitCount=btm.bmBitsPixel; dv7IHUFf
bih.biClrImportant=0; l<DpcLX
bih.biClrUsed=0; ?7eD<|
bih.biCompression=0; B*
hW
bih.biHeight=btm.bmHeight; ' K\ $B_
bih.biPlanes=1; ZC!GKWP2
bih.biSize=sizeof(BITMAPINFOHEADER); <+r<3ZBA
bih.biSizeImage=size; g~/@`Z2Y
bih.biWidth=btm.bmWidth; _T^+BUw
bih.biXPelsPerMeter=0; 12olVTuw
bih.biYPelsPerMeter=0; #P,C9OQD
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); +`(,1L1
static int filecount=0; sI,S(VWor
CString name; ;,&$ob*/
name.Format("pict%04d.bmp",filecount++); `A0trC3
name=m_Path+name; |to|kU
BITMAPFILEHEADER bfh; I_aSC 4
bfh.bfReserved1=bfh.bfReserved2=0; gX'nFGqud
bfh.bfType=((WORD)('M'<< 8)|'B'); 5 0KB:1(g
bfh.bfSize=54+size; OS{j5o
bfh.bfOffBits=54; T+knd'2V6
CFile bf; [BLBxSL
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]+)cXJ}6#
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S!J wF&EW
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uK!G-1
bf.WriteHuge(lpData,size); y5!fbmf
bf.Close(); ohW
qp2~
nCount++; $Y3mO~
} #ouE,<
GlobalFreePtr(lpData); Pkq?tm$#
if(nCount==1) ,x]xtg?
m_Number.Format("%d picture captured.",nCount); nyRQ/.3
else 2c u?2_,
m_Number.Format("%d pictures captured.",nCount); H}f}Y8J{
UpdateData(FALSE); i|/EA7
} N5%Cwl6i
Z{p)rscX
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) vi8)U]6
{ HuRq0/"
if(pMsg -> message == WM_KEYDOWN) QVq+';cG
{ /t$J<bU
if(pMsg -> wParam == VK_ESCAPE) ch-.+p3
return TRUE; qVe&nXo
if(pMsg -> wParam == VK_RETURN) 0DQ\akh
return TRUE; >I&'Rj&Mc
} 3{/Y&/\"'^
return CDialog::PreTranslateMessage(pMsg); xA7Aw0
} 8~6H\.0Q
h!4jl0oX]
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s<hl>vY_'
{ qTV;L-
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ->q^$#e
SaveBmp(); *$6dN x
return FALSE; wBaIN]Y,
} dPx{9Y<FzU
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ PQJI~u9te}
CMenu pop; ='U>P(
R-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 56JvF*hP
CMenu*pMenu=pop.GetSubMenu(0); G Ch]5\
pMenu->SetDefaultItem(ID_EXITICON); -&UP[Mq
CPoint pt; []#>r
k~
GetCursorPos(&pt); kbcqUE
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); mR|;}u;d
if(id==ID_EXITICON) +/|;<K5_LI
DeleteIcon(); %fH&UFby
else if(id==ID_EXIT) 9% wVE]
OnCancel(); NKX62 ZC
return FALSE; *l9Wj$vja
} m&&Y=2
LRESULT res= CDialog::WindowProc(message, wParam, lParam); L3s1a -K
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) o)}M$}4
AddIcon(); s ~Xa=_+D
return res; ,!i!q[YkL9
} 67]kT%0
;+6TZqklQ
void CCaptureDlg::AddIcon() ("!P_Q#
{ .9'bi#:Cw
NOTIFYICONDATA data; 7{fOo%(7
data.cbSize=sizeof(NOTIFYICONDATA); -l2aAK1M
CString tip; ab/^z0GT
tip.LoadString(IDS_ICONTIP); !YZ$WiPl
data.hIcon=GetIcon(0); R{3vPG
data.hWnd=GetSafeHwnd(); 6{8dv9tK
strcpy(data.szTip,tip); %X^K5Io
data.uCallbackMessage=IDM_SHELL; TTQ(\l4
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rV[/G#V>{
data.uID=98; 5+yT{,(5
Shell_NotifyIcon(NIM_ADD,&data); =|Vm69
ShowWindow(SW_HIDE); .`;
bQh'!
bTray=TRUE; F&[MyX U4
} 3~5%6`
q8-*3K
void CCaptureDlg::DeleteIcon() K H&o`U(}
{ -Rcl(Q}LZ
NOTIFYICONDATA data; PrwMR_-
data.cbSize=sizeof(NOTIFYICONDATA); 7!kbe2/]'
data.hWnd=GetSafeHwnd(); 23|R $s>}i
data.uID=98; N |nZf5{
Shell_NotifyIcon(NIM_DELETE,&data); .CY;-
ShowWindow(SW_SHOW); k'b'Ay(<
SetForegroundWindow(); 6M-Y`T`J
ShowWindow(SW_SHOWNORMAL); @Y| %
bTray=FALSE; 1*vt\,G
} ^PrG5|,s
)Co&(;zf
void CCaptureDlg::OnChange() YI!@,t
{ bxFDB^
RegisterHotkey(); PZB_6!}2[F
} "(cMCBVYdA
E3`&W8
BOOL CCaptureDlg::RegisterHotkey() O\=c&n~`
{ g*a|QBj%
UpdateData(); cE SSSH!m
UCHAR mask=0; _a[)hu8q.
UCHAR key=0;
B(/)mB
if(m_bControl) ){S/h<4m
mask|=4; .Km6
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if(m_bAlt) x=jS=3$8
mask|=2; ^`<
%Pk
if(m_bShift) XaH%i~}3
mask|=1; XI8rU)q
key=Key_Table[m_Key.GetCurSel()]; }p$@.+
if(bRegistered){ n)6mfoe
DeleteHotkey(GetSafeHwnd(),cKey,cMask); W^sH|2g
bRegistered=FALSE; ZlEH3-Zv
} KDUa0$"
cMask=mask; WAWy3i
cKey=key; T
7EkRcb
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !y 7SCz
g
return bRegistered; m
c q!_#{y
} >ngP\&\
b8$(j2B~
四、小结 V3] Z~@
U)B^R
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。