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:
Sc<dxY@w7-
FQZ*i\G>> 一、实现方法
SI7rTJ]/ vm [lMx 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:
) c@gRb~ kCBtK?g #pragma data_seg("shareddata")
-Jd|H*wWo HHOOK hHook =NULL; //钩子句柄
E]V,
@ UINT nHookCount =0; //挂接的程序数目
H/,KY/>i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
u$nzpw0=H static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
S=@+qcI static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
I7ao2aS static int KeyCount =0;
^FVdA1~/ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
~A0]vcP #pragma data_seg()
$WA wMS, }lZEdF9GhG 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
WtM%(8Y[] @Z5q2Q DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
"[)G{VzT LlTD =tJ0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
5y#,z`S cKey,UCHAR cMask)
_"8n&=+ {
^C>kmo3J BOOL bAdded=FALSE;
hx$]fvDevD for(int index=0;index<MAX_KEY;index++){
&Vlno* if(hCallWnd[index]==0){
qt8Y3:=8l hCallWnd[index]=hWnd;
j7I=2xnTWu HotKey[index]=cKey;
3",gjXmBu HotKeyMask[index]=cMask;
+R'8$ bAdded=TRUE;
=EJ&=t KeyCount++;
8}QM~&&. break;
15:9JVH3D }
C,| & }
YvY|\2^K return bAdded;
o}N@Q-i gq }
PGTEIptX7 //删除热键
w2LnY1A BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
, ZsZzZ# {
`z!AjAT-G BOOL bRemoved=FALSE;
k!c7eP"%8^ for(int index=0;index<MAX_KEY;index++){
$|$@?H>K if(hCallWnd[index]==hWnd){
z"@^'{.l if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
} z'Jsy[s hCallWnd[index]=NULL;
axQ>~vWN/ HotKey[index]=0;
VG5+u,U6> HotKeyMask[index]=0;
(HNc9QVC'W bRemoved=TRUE;
ing'' _ KeyCount--;
;&d#)&O"e break;
\/Y(m4<P }
`YOYC }
5%-{r& }
}7.A~h return bRemoved;
`d <`> }
Q{/z>-X\x t=%zY~P j0l{Mc5 DLL中的钩子函数如下:
J6 ~Sr N&8$tJ(hhx LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
( 5LCy?-6 {
P1F-Wy1 BOOL bProcessed=FALSE;
-}7$;QK&a if(HC_ACTION==nCode)
dL42)HP5 {
{"o9pIh{~ if((lParam&0xc0000000)==0xc0000000){// 有键松开
*@rA7zPFf switch(wParam)
]d*9@+Iu {
oW~W(h! case VK_MENU:
Zkp~qx MaskBits&=~ALTBIT;
5/.W-Q\pl} break;
yi$CkG} case VK_CONTROL:
&xGdKH
MaskBits&=~CTRLBIT;
{B$CqsvJ break;
80nE QT
y case VK_SHIFT:
7L~*%j MaskBits&=~SHIFTBIT;
:WB uU break;
'#Wx@ default: //judge the key and send message
V]zZb-m= break;
XYU5. }
V.B@@ ; for(int index=0;index<MAX_KEY;index++){
6uE20O<z] if(hCallWnd[index]==NULL)
C'#KTp4!1 continue;
0["93n}r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9#DXA} {
Ip8ml0oG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
s&73g0$$ bProcessed=TRUE;
#A)V }
J|WE&5' }
!5,C"r }
~RR!~q else if((lParam&0xc000ffff)==1){ //有键按下
':.Hz]]/A switch(wParam)
:1 +Aj
( {
@.;+WQE case VK_MENU:
}geb959 MaskBits|=ALTBIT;
,dRaV</2 break;
93*csO?Db case VK_CONTROL:
p%I)&- 8 MaskBits|=CTRLBIT;
N[Z`tk?- break;
&d6@SQ case VK_SHIFT:
=-sTV\ MaskBits|=SHIFTBIT;
u`|%qRt break;
~[CFs'`(2 default: //judge the key and send message
;L-=z]IR, break;
Sz5t~U=G }
o\8?CNm1( for(int index=0;index<MAX_KEY;index++){
M 5#wz0 if(hCallWnd[index]==NULL)
+Tum K. continue;
\ eHOHHAGW if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZSf &M {
^50dF:V(1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
TFXBN.?9T bProcessed=TRUE;
5FZw
(E }
'jt7H{M }
uw mN!!TS }
'5h`=" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
TpU\IQ for(int index=0;index<MAX_KEY;index++){
tF;0P\i if(hCallWnd[index]==NULL)
=Jm[1Mgt continue;
^s)`UZ<C= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
W9SU1{*9 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0? {ADQz //lParam的意义可看MSDN中WM_KEYDOWN部分
4*EMd!E=< }
,YD7p= PY }
kjYM&q }
+O/b[O'0 return CallNextHookEx( hHook, nCode, wParam, lParam );
2^r~-> }
5FOMh"!z\ bZxN]6_ 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:
o[>d"Kp -6[DQB BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
v,<14w BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
R"W}\0k
Lt*P& 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:
G9:XEEN REW[`MBQ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2U)n^ {
!q\8`ss if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
d:)#-x*h7 {
@7 Ry{,A //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
kcfT|@:MK" SaveBmp();
bYsX?0T!p return FALSE;
Y4k2=w:D }
lDL&":t …… //其它处理及默认处理
`2Pa{g-. }
t/;2rIx> v@qP &4Sp !!C/($ 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。
8}|et~7! f~VlCdf+ 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。
}n^Rcz6HeO Qx)b4~F? 二、编程步骤
*(9Tl]w GLsa]}m,9 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";
3E*|^* (=j;rfvP 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
b~aM=71 ](Fey0@ 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;
%,\JTN|g|A J?o 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;
qb? <u !
I:N< 5、 添加代码,编译运行程序。
kX8C'D4 gX ZJ3g,dc 三、程序代码
hl1IG
! E@GYl85fI ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
"# *W#ohVA #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
#8Bh5L!SJ1 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
?tLApy^`? #if _MSC_VER > 1000
c_>Gl8J #pragma once
U}w'/:H #endif // _MSC_VER > 1000
.\
Ijq! #ifndef __AFXWIN_H__
=UKxf #error include 'stdafx.h' before including this file for PCH
\0)jWCK #endif
vhBW1/w&F #include "resource.h" // main symbols
Z|t=t"6" class CHookApp : public CWinApp
hU$aZ {
gGrVpOzBj public:
jrp>Y: CHookApp();
t]HY@@0g // Overrides
w9'>&W8T // ClassWizard generated virtual function overrides
"<iH8MzZ //{{AFX_VIRTUAL(CHookApp)
*qzdt^[ xo public:
D7hTn@I virtual BOOL InitInstance();
.~i|kc]Ue virtual int ExitInstance();
Go%Z^pF3CO //}}AFX_VIRTUAL
VM$n|[C~ //{{AFX_MSG(CHookApp)
$yx\2 // NOTE - the ClassWizard will add and remove member functions here.
6ld4'oM // DO NOT EDIT what you see in these blocks of generated code !
">[#Ops-;$ //}}AFX_MSG
*D|a`R!Y DECLARE_MESSAGE_MAP()
WZ' Z"' };
_wKwiJs LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Jxvh; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
h ;*x1BVE BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
YYQvt BOOL InitHotkey();
F{x+1hct0 BOOL UnInit();
sa'1hX^@ #endif
?oYO !
IAO5li3 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
5_(\Cd<# #include "stdafx.h"
`vBBJ@f4) #include "hook.h"
Wj.t4XG! #include <windowsx.h>
QXb2jWz #ifdef _DEBUG
L"b&O<No #define new DEBUG_NEW
Bt<)1_ #undef THIS_FILE
S)U*1t7[
static char THIS_FILE[] = __FILE__;
kp*v:* #endif
lsax.uG5x #define MAX_KEY 100
CzBYH #define CTRLBIT 0x04
;+~5XLk #define ALTBIT 0x02
.`IhxE~mN #define SHIFTBIT 0x01
Em!- W5*s #pragma data_seg("shareddata")
E&8Nh J HHOOK hHook =NULL;
i)x0]XF UINT nHookCount =0;
ov+{<0Q
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Wep^He\: static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
|u>V>
PN static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
v.]{b8RR static int KeyCount =0;
$5XAS static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
]W3_]N 3 #pragma data_seg()
*q6XK_ HINSTANCE hins;
X7$]qE K void VerifyWindow();
t=Oq<r BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
PaKa bPY //{{AFX_MSG_MAP(CHookApp)
i%o%bib# // NOTE - the ClassWizard will add and remove mapping macros here.
rn-bfzoDS // DO NOT EDIT what you see in these blocks of generated code!
Z:{|
?4 //}}AFX_MSG_MAP
p4P=T@: END_MESSAGE_MAP()
X,49(-~\ 5|rBb[ CHookApp::CHookApp()
n.@HT" {
h~#iGs // TODO: add construction code here,
#&.Znk:@.f // Place all significant initialization in InitInstance
toA}0MI(: }
y_9\07va< Gi)Vr\Q. CHookApp theApp;
"lt <$. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|"}rdOV) {
iDDJJ>F26 BOOL bProcessed=FALSE;
sRt7.fe if(HC_ACTION==nCode)
"w?0f[" {
tl_3 %$s if((lParam&0xc0000000)==0xc0000000){// Key up
@g#5d|U); switch(wParam)
ejd_ 85$ {
$2uC%er"H case VK_MENU:
?!Y_w2 MaskBits&=~ALTBIT;
Z#}sK5s break;
%UI^+:C case VK_CONTROL:
j/aJD E(+ MaskBits&=~CTRLBIT;
kEh\@x[ break;
4ior case VK_SHIFT:
ovp/DM MaskBits&=~SHIFTBIT;
M+:5gMB' break;
ddgDq0N1j default: //judge the key and send message
!SK`!/7c? break;
X2V+cre }
;y(;7n_ a for(int index=0;index<MAX_KEY;index++){
9JdJn> if(hCallWnd[index]==NULL)
;Ci:d* continue;
76D$Nm if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
L"jA#ULg {
qIJc\,' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
G
y[5'J` bProcessed=TRUE;
_|\X8o_ }
0f5 ag& }
R([zlw~B5 }
N'y<<tTA else if((lParam&0xc000ffff)==1){ //Key down
a
&tWMxBr switch(wParam)
B=]j=\o {
)M<+?R$]; case VK_MENU:
mP*$wE9b,: MaskBits|=ALTBIT;
(K[e=0Rf break;
e\X[\ve case VK_CONTROL:
/rpr_Xw} MaskBits|=CTRLBIT;
^1 ){
@( break;
6
5zx< case VK_SHIFT:
hr]+4!/ MaskBits|=SHIFTBIT;
Vja 4WK* break;
waMV6w)< default: //judge the key and send message
i1x4$} break;
*w;?&)8% }
S
}`f& for(int index=0;index<MAX_KEY;index++)
79 4UY {
K1X-<5]{ if(hCallWnd[index]==NULL)
Y-})/zFc continue;
X QLP|v;" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
U LS>v {
B!mHO*g SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
J3y_JoS bProcessed=TRUE;
uNI&U7_" }
$Z;8@O3 }
;>2- }
koT3~FK if(!bProcessed){
o<A-ETx< for(int index=0;index<MAX_KEY;index++){
_1?u AQ3, if(hCallWnd[index]==NULL)
29grb P continue;
HKbV@NW if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
R'Ue>k SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
KAZ<w~55c }
2K_ QZ
}
6)sKg{H }
tC'#dU`=qY return CallNextHookEx( hHook, nCode, wParam, lParam );
rL\}>VC) }
Rng-o! HIw)HYF2 BOOL InitHotkey()
s YTJ^K d {
T%.Yso{ if(hHook!=NULL){
3F"vK nHookCount++;
;q'-<O return TRUE;
D,=~7/g }
8\;, d else
/
^)3V} hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
*Z"cXg^ti if(hHook!=NULL)
274j7Y' nHookCount++;
=ttD5p return (hHook!=NULL);
Re~6' }
dlvU=^G#G BOOL UnInit()
r3x;lICx- {
]+`K\G ^X if(nHookCount>1){
ds`YVXKH nHookCount--;
FrMXf,} return TRUE;
T x
Mh_ }
J8\l'}?& BOOL unhooked = UnhookWindowsHookEx(hHook);
f~l pa7 if(unhooked==TRUE){
]?_~QE` nHookCount=0;
:V6
[_VaF hHook=NULL;
LS*L XC }
zq+2@"q return unhooked;
nN$.^!;& }
}s?3 @ *Jbp BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o,j_eheAM {
4w|t|? BOOL bAdded=FALSE;
2wO8;wiA for(int index=0;index<MAX_KEY;index++){
Wj3i*x$
if(hCallWnd[index]==0){
[[_>DM hCallWnd[index]=hWnd;
Z[[*:9rY| HotKey[index]=cKey;
'9]?jkl HotKeyMask[index]=cMask;
DCa[?|Y bAdded=TRUE;
i5(qJ/u KeyCount++;
n]vCvmt break;
[3=Y 9P: }
,l!>+@ }
An>ai N] return bAdded;
(ID%U }
-`ljKp EyR/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vg?(0Gasm* {
6{d?3Jk BOOL bRemoved=FALSE;
M%54FsV for(int index=0;index<MAX_KEY;index++){
W`LG.`JW if(hCallWnd[index]==hWnd){
\="U|LzG if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
R7b-/
!L hCallWnd[index]=NULL;
=M:Po0?0E HotKey[index]=0;
tHaHBx1P HotKeyMask[index]=0;
6|Dtx5
"r bRemoved=TRUE;
[ {"x{; KeyCount--;
R%LFFMVn break;
&b~X&{3, }
cb'Ya_ }
Hwd^C2v }
VO1 return bRemoved;
}x$@j }
dR i6 xxzUey void VerifyWindow()
f
} r
\ {
CUTjRWQ for(int i=0;i<MAX_KEY;i++){
M'|[:I.V if(hCallWnd
!=NULL){ MZ0cZv$v!~
if(!IsWindow(hCallWnd)){ =ZoNkj/^,
hCallWnd=NULL; D$KP>G
HotKey=0; | J'k9W"
HotKeyMask=0; RpU i'
KeyCount--; Tn,_0
} vS ( Y_6
} ,;YNI
} 3
u=\d)eq
} ~%tVb c
g_PP9S_?
BOOL CHookApp::InitInstance() o
S{hv:)>
{ b!MN QGs
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5KbPpKpd
hins=AfxGetInstanceHandle(); i\Yd_
InitHotkey(); %q r,Ssa/
return CWinApp::InitInstance(); 5mVO9Qj
} YG?4DF
M-;MwLx
int CHookApp::ExitInstance() Xa-TNnws?
{ {c
I~Nf?i
VerifyWindow(); H!FaI(YZl
UnInit(); V*?QZ;hCP
return CWinApp::ExitInstance(); Mx0~^l
} t?^!OJ:L
t~}c"|<t
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 6 ym$8^
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $uwz`N:
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ b'FTyi
#if _MSC_VER > 1000 m0W3pf
#pragma once lZkJ<*z#
#endif // _MSC_VER > 1000 Qa2p34Z/
/J"fbBXwY
class CCaptureDlg : public CDialog Qa9@Q$
{ hb0)<^xu
// Construction ~tL:r=
public: `o9:6X?RA
BOOL bTray; uDcs2^2l
BOOL bRegistered; D'moy*E
BOOL RegisterHotkey(); rkh%[o9"/
UCHAR cKey; c#?~1@=
UCHAR cMask; 1H%p|'FKA
void DeleteIcon(); 1bz^$2/k
void AddIcon(); 55`p~:&VQ
UINT nCount; ( ,mV6U%
void SaveBmp(); u"T9w]Z\
CCaptureDlg(CWnd* pParent = NULL); // standard constructor WAuT`^"u
// Dialog Data c|'$3dB*
//{{AFX_DATA(CCaptureDlg) ,QA=)~;D
enum { IDD = IDD_CAPTURE_DIALOG }; KDf#e3
CComboBox m_Key; v0!(&g3Sd
BOOL m_bControl; |
h "$
BOOL m_bAlt; [SKDsJRPP
BOOL m_bShift; li{<F{7
CString m_Path; '9qyf<MlY
CString m_Number; Vnb@5W2\
//}}AFX_DATA e&A3=a~\s
// ClassWizard generated virtual function overrides iBWEZw)
//{{AFX_VIRTUAL(CCaptureDlg) ME)='~E
public: W! |_ hL
virtual BOOL PreTranslateMessage(MSG* pMsg); fMHw=wJQ
protected: HdY#cVxy
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^K8XY@{&
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); AfZGI'%4[a
//}}AFX_VIRTUAL \Lb wfd=
// Implementation g rI#' x
protected: W7.RA>
HICON m_hIcon;
@qWClr{`
// Generated message map functions ~ e<,GUx(]
//{{AFX_MSG(CCaptureDlg) V3|"
v4
virtual BOOL OnInitDialog(); 5&A' +]
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); G^;]]Ji"
afx_msg void OnPaint(); BTOl`U
afx_msg HCURSOR OnQueryDragIcon(); 9J_vvq`%`
virtual void OnCancel(); ?J+*i
d
afx_msg void OnAbout(); F}F{/
afx_msg void OnBrowse(); ",5=LW&,
afx_msg void OnChange(); 1o_Zw.
//}}AFX_MSG !K= $Q Uq
DECLARE_MESSAGE_MAP() p vWj)4e
}; vy7?]}MvV
#endif wsR\qq
-4L27C
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,DCUBD u&
#include "stdafx.h" " :[;}f;
#include "Capture.h" ,s}7KE
#include "CaptureDlg.h" 1j}e2H
#include <windowsx.h> [H$kVQC
#pragma comment(lib,"hook.lib") 39~WP$GM
#ifdef _DEBUG &P*r66
#define new DEBUG_NEW Dl\0xcE
#undef THIS_FILE -EU=R_yg
static char THIS_FILE[] = __FILE__; y+7+({w<
#endif R+U*]5~R
#define IDM_SHELL WM_USER+1 U(~Nmo'
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *y+K{ fM1
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m<;MOS
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ulEtZ#O{_
class CAboutDlg : public CDialog 3+C;zDKa
{ LR4W
public: n(n7"+B
CAboutDlg(); #!m^EqF1_
// Dialog Data *uxKI:rB:
//{{AFX_DATA(CAboutDlg) >r4BI}8SK<
enum { IDD = IDD_ABOUTBOX }; u2':~h?l
//}}AFX_DATA c*(=Glzn
// ClassWizard generated virtual function overrides V6Of(;r
//{{AFX_VIRTUAL(CAboutDlg) ne[H `7c
protected: }\A0g}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uc=u4@.>
//}}AFX_VIRTUAL pJo4&Ff
// Implementation '7@Dw;
protected: xkkG#n)
//{{AFX_MSG(CAboutDlg) "HJQAy?W
//}}AFX_MSG R&'Mze fb
DECLARE_MESSAGE_MAP() tPw7zFy6r
}; mEb`ET|
i!<(R$Lo
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 11!4#z6w
{ K)\D,5X^
//{{AFX_DATA_INIT(CAboutDlg) d(5j#?
//}}AFX_DATA_INIT p-z!i +
} (f*r
i1HO>X:ea
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 27F:-C~.9
{ J3r':I}\
CDialog::DoDataExchange(pDX); JvJ)}d$,&
//{{AFX_DATA_MAP(CAboutDlg) &Ci_wDJ
//}}AFX_DATA_MAP {-|El}.M
} _JKz5hSl
)%:
W;H
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) kWbY&]ZO
//{{AFX_MSG_MAP(CAboutDlg) (5 RZLRn
// No message handlers lZ,$lZg9Z
//}}AFX_MSG_MAP ,M\/[_:
END_MESSAGE_MAP() dVJ9cJ9^
Lk)TK/JM)
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1"1ElH
: CDialog(CCaptureDlg::IDD, pParent) k6;pi=sYNW
{ $7Tj<;TV
//{{AFX_DATA_INIT(CCaptureDlg)
@3I?T
Q1
m_bControl = FALSE; 4LJOT_
m_bAlt = FALSE; iZ(p]0aP7
m_bShift = FALSE; u^L_X A
m_Path = _T("c:\\"); EYZ,GT-I
m_Number = _T("0 picture captured."); \qJ^n %
nCount=0; &';@CeK
bRegistered=FALSE; Ds8x9v)^
bTray=FALSE; ?xE'i[F @
//}}AFX_DATA_INIT Gl T/JZ9
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 S2=x,c$
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <1U *{y
} X(>aW*q
D6P/39}W
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z~"8C Kz
{ 7P52r
CDialog::DoDataExchange(pDX); S~ y.>X3"P
//{{AFX_DATA_MAP(CCaptureDlg) fa/p
DDX_Control(pDX, IDC_KEY, m_Key); L\t!)X-4
DDX_Check(pDX, IDC_CONTROL, m_bControl); 4DGKZh'm"
DDX_Check(pDX, IDC_ALT, m_bAlt); \JF 2'm\M
DDX_Check(pDX, IDC_SHIFT, m_bShift); ><)fK5x
DDX_Text(pDX, IDC_PATH, m_Path); Lo9
\[4FP
DDX_Text(pDX, IDC_NUMBER, m_Number); h*mKS -TC
//}}AFX_DATA_MAP ,^T0!k$
} ^P*+0?aFr
<yKyM#4X
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;FjI!V
//{{AFX_MSG_MAP(CCaptureDlg) ksqb& ux6
ON_WM_SYSCOMMAND() fp"GdkO#}i
ON_WM_PAINT() R1:7]z0B
ON_WM_QUERYDRAGICON() DEenvS`,P
ON_BN_CLICKED(ID_ABOUT, OnAbout) c{/KkmI
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;:Y/"5h
ON_BN_CLICKED(ID_CHANGE, OnChange) :*Z@UY
//}}AFX_MSG_MAP 8WG_4e
END_MESSAGE_MAP() K$
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~A>-tn}O
BOOL CCaptureDlg::OnInitDialog() >DR/lBtL
{ 3^F1 hCB
CDialog::OnInitDialog(); H4e2#]*i7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0MOn>76$N
ASSERT(IDM_ABOUTBOX < 0xF000); p"NuR4
CMenu* pSysMenu = GetSystemMenu(FALSE); p?+;[!:
if (pSysMenu != NULL) }An;)!>(nF
{ Olq`mlsK
CString strAboutMenu; PW-sF
strAboutMenu.LoadString(IDS_ABOUTBOX); M3q7{w*bM
if (!strAboutMenu.IsEmpty()) fR lJ`\ t
{ i,$n4
pSysMenu->AppendMenu(MF_SEPARATOR); xT8!X5;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zvbz3 a
} EJTa~
} S%w67sGl4n
SetIcon(m_hIcon, TRUE); // Set big icon OKNGV,{`
SetIcon(m_hIcon, FALSE); // Set small icon aDX4}`u
m_Key.SetCurSel(0); Qlhm:[
RegisterHotkey(); Eqt>_n8
CMenu* pMenu=GetSystemMenu(FALSE); i
th!,jY*i
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1++ Fs
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); atfK?VK#
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \
id(P3M
return TRUE; // return TRUE unless you set the focus to a control ;:ocU?
} $/P\@|MqYQ
8EZ,hY^
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9CHn6 v ~)
{ j!?bE3r~
if ((nID & 0xFFF0) == IDM_ABOUTBOX) g7]g0*gxXW
{ !%G;t$U=M
CAboutDlg dlgAbout; ch0x*[N@
dlgAbout.DoModal(); ~ZRtNL9
} T;B/Wm!x
else VD2o#.7*eu
{ RS
Vt
CDialog::OnSysCommand(nID, lParam); sQa9M
} )Z@hk]@?_[
} Th 5}?j7
]\J(
void CCaptureDlg::OnPaint() E&|EokSyN
{ !Ka~X!+\
if (IsIconic()) #0/^v*
{ \'Ca%j
CPaintDC dc(this); // device context for painting R&1xZFj
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &}lRij&`
// Center icon in client rectangle N'0fB`:kz
int cxIcon = GetSystemMetrics(SM_CXICON);
8B7,qxZ
int cyIcon = GetSystemMetrics(SM_CYICON); Z+! 96LR
CRect rect; -<gQ>`(0
GetClientRect(&rect); x!9bvQT
int x = (rect.Width() - cxIcon + 1) / 2; ut9R]01:
int y = (rect.Height() - cyIcon + 1) / 2; o(Ro/U(Wu
// Draw the icon Sy34doAZ
dc.DrawIcon(x, y, m_hIcon); [E/^bM+
} Y@V6/D} 1
else uBBW2
{ \AB*C_Ri
CDialog::OnPaint(); ;Q%3WD
} I6F $@
} R2nDK7j
%{";RfSVX%
HCURSOR CCaptureDlg::OnQueryDragIcon() Y t0s
{ ;i;;{j@$i
return (HCURSOR) m_hIcon; |#(g8ua7
} L~L]MC&
)]m_ L$9
void CCaptureDlg::OnCancel() ZfIeq<8_
{ B7BikxUa
if(bTray) O6r.q&U
DeleteIcon(); ? 1b*9G%i
CDialog::OnCancel(); 8]0?mV8iOE
} eqWb>$
fm^)u"
void CCaptureDlg::OnAbout() 38(|a5
{ :vy./83W
CAboutDlg dlg; oJ)v6"j
dlg.DoModal(); %p.hwgvnp
} "0l7%@z*)q
uB uwE6
void CCaptureDlg::OnBrowse() 9IG3zM f
{ FuZLE%gP
CString str; gT4H?
#UB
BROWSEINFO bi;
`_H^k!^
char name[MAX_PATH]; v_ W03\
ZeroMemory(&bi,sizeof(BROWSEINFO)); Y@M
l}43
bi.hwndOwner=GetSafeHwnd(); rlVo}kc7:
bi.pszDisplayName=name; } T<oLvS
bi.lpszTitle="Select folder"; pNR69/wGi
bi.ulFlags=BIF_RETURNONLYFSDIRS; 1`8(O >5
LPITEMIDLIST idl=SHBrowseForFolder(&bi); HA%r:Px
if(idl==NULL) xDBHnr}[
return;
al:c2o
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q\<^ih51
str.ReleaseBuffer(); }x}JzA+2
m_Path=str; 5mYI5~
p
if(str.GetAt(str.GetLength()-1)!='\\') wa4(tM2
m_Path+="\\"; ]gGCy '*)
UpdateData(FALSE); $5m_)]w4a
} T@H2[ 7[;
;Cqjg.wkB
void CCaptureDlg::SaveBmp() N?;5%pG
<
{ B[Fuy y?
CDC dc; eFeWjB'<7
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ayi
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CBitmap bm; jo8;S?+<|?
int Width=GetSystemMetrics(SM_CXSCREEN); h 66X746
int Height=GetSystemMetrics(SM_CYSCREEN); }8qsE
bm.CreateCompatibleBitmap(&dc,Width,Height); 9d!}]+"d42
CDC tdc; -a$7b;gF
tdc.CreateCompatibleDC(&dc); XZ8;Ow=
CBitmap*pOld=tdc.SelectObject(&bm); mh8~w~/[
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); A?sU[b6_
tdc.SelectObject(pOld); PNMf5'@m
BITMAP btm; x2gP, p-
bm.GetBitmap(&btm); ZM%z"hO9R
DWORD size=btm.bmWidthBytes*btm.bmHeight; ,0Y5O?pu\
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4?^t=7N
BITMAPINFOHEADER bih; [,fd Nxc8
bih.biBitCount=btm.bmBitsPixel; &$</|F)y
bih.biClrImportant=0; 5U/1Z{
bih.biClrUsed=0; l6Q75i)eF
bih.biCompression=0; #GHLF
bih.biHeight=btm.bmHeight; ]xIfgSq
bih.biPlanes=1; [#R<Z+c
bih.biSize=sizeof(BITMAPINFOHEADER); p@7[w@B\c
bih.biSizeImage=size; UPkD^D,
bih.biWidth=btm.bmWidth; .%4{zaB
bih.biXPelsPerMeter=0; R'q:Fc
bih.biYPelsPerMeter=0; ;hLne0|)}
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [oQ&}3\XJ
static int filecount=0; j\SW~}d9
CString name; -f-2!1&<3h
name.Format("pict%04d.bmp",filecount++); :J}@*>c
name=m_Path+name; 8HLcDS#
BITMAPFILEHEADER bfh; 7E9h!<5v
bfh.bfReserved1=bfh.bfReserved2=0; .1F^=C.w
bfh.bfType=((WORD)('M'<< 8)|'B'); H19CVc\B
bfh.bfSize=54+size; z<F.0~)jb
bfh.bfOffBits=54; JDzkv%E^
CFile bf; vK\;CSk
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y(]&j`%
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,1YnWy*
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #)BdN
bf.WriteHuge(lpData,size); L_rKVoKjt
bf.Close(); a,U =irBA
nCount++; %8V/QimHU
} Pl
}dA
GlobalFreePtr(lpData); 7^~pOFdH
if(nCount==1) k'BLos1W
m_Number.Format("%d picture captured.",nCount); oIM]
else .#;;pu7W
m_Number.Format("%d pictures captured.",nCount); "=W7=V8w
UpdateData(FALSE); 9J?G"JV?
} RkJ\?
sS $- PX
C
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) { [4Y(l1
{ o"x&F
if(pMsg -> message == WM_KEYDOWN) [D H@>:"dd
{ %L./U$
if(pMsg -> wParam == VK_ESCAPE) ?~aM<rcZ
return TRUE; jz$)*Kdi*
if(pMsg -> wParam == VK_RETURN) -< 7KW0CA
return TRUE; "l&sDh%Lk<
} &0
VM <
return CDialog::PreTranslateMessage(pMsg); {=,?]Z+
} jBEt!Azur
XRI1/2YA
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kl| KFdA;
{ !o 7uZC\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .JpYZ |
SaveBmp(); BcT|TX+ct
return FALSE; 1Ly?XNS
} NdQXQa?,
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H3.WAg[`
CMenu pop; $2^V#GWo
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *Df|D/,WE
CMenu*pMenu=pop.GetSubMenu(0); Y1
i!
pMenu->SetDefaultItem(ID_EXITICON); 'B"kUh%3$5
CPoint pt; g2hxWf"
GetCursorPos(&pt); 2WIbu-"l
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `\&qk)ZP
if(id==ID_EXITICON) 48n>[
FMSR
DeleteIcon(); P,O9On
else if(id==ID_EXIT) KW.S)+<H&
OnCancel(); s&lZxnIjc
return FALSE; UJ)\E
^Hp
} &,fBg6A%
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z$,1Tk"O/s
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dox QS ohS
AddIcon(); "$#x+|PyC
return res; 'W$jHs
} f$k#\=2%
)4a&OlEI
void CCaptureDlg::AddIcon() CPGXwM=
{ <9/oqp{C4
NOTIFYICONDATA data; 7fl'nCo\"
data.cbSize=sizeof(NOTIFYICONDATA); y-"*[5{W
CString tip; /
GJ"##<
tip.LoadString(IDS_ICONTIP); j*$GP'Df3
data.hIcon=GetIcon(0); {P(Z{9 u%
data.hWnd=GetSafeHwnd(); -?!Z/#i4
strcpy(data.szTip,tip); SM:{o&S`
data.uCallbackMessage=IDM_SHELL; D;<Qm,[
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _qmBPUx
data.uID=98; JPiC/
Shell_NotifyIcon(NIM_ADD,&data); '&3Sl?E
ShowWindow(SW_HIDE); B\}E v&
bTray=TRUE; W?'!}g(~
} x-U^U.i@
$;+B)#
void CCaptureDlg::DeleteIcon() q[b-vTzI
{ ag?@5q3J}
NOTIFYICONDATA data; L"tj DAV
data.cbSize=sizeof(NOTIFYICONDATA); ^?toTU
data.hWnd=GetSafeHwnd(); _q=$L
eO5
data.uID=98; c?eV8h1G
Shell_NotifyIcon(NIM_DELETE,&data); \GbT^!dj
ShowWindow(SW_SHOW); ,I@4)RSAH|
SetForegroundWindow(); "^<:7 _Y
ShowWindow(SW_SHOWNORMAL); lV$U!v:b
bTray=FALSE; 4%p5X8|\ih
} _?@>S 7-
mw`%xID*
void CCaptureDlg::OnChange() \J-O b
{ r#]gAG4t\
RegisterHotkey(); uHQJ&
} 42Vy#t/HC
*s?&)][
BOOL CCaptureDlg::RegisterHotkey() 8{JTR|yB
{ :
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UpdateData(); Y.i<7pBt
UCHAR mask=0; KE16BjX@
UCHAR key=0; ; ZL<7tLDb
if(m_bControl) =}r&>|rrJ
mask|=4; QKZm<lUL
if(m_bAlt) S5v>WI^0h
mask|=2; &N*S
if(m_bShift) 0} liK
mask|=1; KL.{)bi
key=Key_Table[m_Key.GetCurSel()]; 0tn5>Dsk
if(bRegistered){ 9|Jmj @9
DeleteHotkey(GetSafeHwnd(),cKey,cMask); b3EW"^Ar
bRegistered=FALSE; xv7^
} YIfPE{,
cMask=mask; CHWyy
cKey=key; G+b $WQn2t
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); KzeA+PI
return bRegistered; (LRv c!`"
} jfqWcX.X=
XT~JP
四、小结 ;b
cy(Fp,\
XOgX0cRC4
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。