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:
XrvrN^'
xNONf4I:6J 一、实现方法
]A\n>Z!; K;Xn!:) V: 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:
dxd}:L~z y3xP~]n #pragma data_seg("shareddata")
xq]&XlA:ug HHOOK hHook =NULL; //钩子句柄
ZBYmAD UINT nHookCount =0; //挂接的程序数目
712i| static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
O-|3k$'\z static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
~q9RZ#g13J static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
4gZN~_AI< static int KeyCount =0;
i0R=P[ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
m1cyCD #pragma data_seg()
7z$+ *]9- *"4ltWS 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。
7Jqp2\ $~j]/ U DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
[IYs4Y5 HsXFglQ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
''(T3;^ +
cKey,UCHAR cMask)
0 Hq$h {
9 (&!>z BOOL bAdded=FALSE;
kfHLjr. for(int index=0;index<MAX_KEY;index++){
Oll\T GXP! if(hCallWnd[index]==0){
VOiphw` hCallWnd[index]=hWnd;
/q^( uWu HotKey[index]=cKey;
E6US HotKeyMask[index]=cMask;
wg[*]_,a bAdded=TRUE;
{Cd*y6lI KeyCount++;
}`eeIt I+ break;
?LW1D+ }
1k7E[G~G| }
F8k1fmM]Y return bAdded;
isN"7y|r:X }
8=?I/9Xh //删除热键
-8TLnl~[ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Di L@NU!$q {
@tP,l$O& BOOL bRemoved=FALSE;
Zs4N0N{ for(int index=0;index<MAX_KEY;index++){
=l\D7s if(hCallWnd[index]==hWnd){
L2:C6Sc if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
uo%zfi? hCallWnd[index]=NULL;
5n"'M&Ce HotKey[index]=0;
oo qNPLa HotKeyMask[index]=0;
LPXwfEHOm bRemoved=TRUE;
f&,.h"bS KeyCount--;
[m4<j break;
':fVb3A[*d }
[g/g(RL }
xo*a9H?@ }
*L!R4;ubE return bRemoved;
n.T
[a }
y K{~ P--#5W;^oB 0 8U:{LL DLL中的钩子函数如下:
%++q+pa ;TR.UUT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@U9ov >E {
m/{rmtA4 BOOL bProcessed=FALSE;
w,P2_xk` if(HC_ACTION==nCode)
:8rqTBa` {
/!LfEO if((lParam&0xc0000000)==0xc0000000){// 有键松开
lKa}Bcd switch(wParam)
v<c8qg {
} o=g) case VK_MENU:
)QKZI))G0 MaskBits&=~ALTBIT;
rj6wKfz break;
0)nU[CY case VK_CONTROL:
)cvC9gt MaskBits&=~CTRLBIT;
+Oxl1fDf break;
P3:hGmk8|j case VK_SHIFT:
*v&g>Ni MaskBits&=~SHIFTBIT;
Z)ObFJMG5 break;
N#UyAm<9 default: //judge the key and send message
S |B7HS5 break;
>Rr]e`3wG }
0>AA-~=- for(int index=0;index<MAX_KEY;index++){
eHv/3"Og if(hCallWnd[index]==NULL)
^y??pp<1J continue;
5ecqJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
uh GL1{ {
kmuF*0Bjk SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
g.veHh|;_ bProcessed=TRUE;
w+JDu_9+A] }
{?
6]_J }
K}*s^*X }
FkRrW^?5G else if((lParam&0xc000ffff)==1){ //有键按下
Z*oGVr
g switch(wParam)
oEfKL`]B {
t<Og?m}( case VK_MENU:
9 Z4H5!:( MaskBits|=ALTBIT;
;Neld #%J break;
PsTwJLY case VK_CONTROL:
qEywExdiu MaskBits|=CTRLBIT;
J0{0B=d; break;
Er%nSH^" case VK_SHIFT:
e\)PGjSI MaskBits|=SHIFTBIT;
tW 9vo-{+ break;
/Jo*O=Lpo default: //judge the key and send message
f):|Ad| break;
O* 7"Q& }
-()CgtSR for(int index=0;index<MAX_KEY;index++){
AJj6@hi2P if(hCallWnd[index]==NULL)
p!HpqW continue;
uv Z!3 UH. if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=WHdy; {
V a<L[8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`~gyq>Ik2 bProcessed=TRUE;
] @IzJz"R }
\[Q,>{^ }
WJl&Vyl2FL }
pvcD
61, if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&t`l,]PQ=6 for(int index=0;index<MAX_KEY;index++){
lh
.p`^v if(hCallWnd[index]==NULL)
{6RT&w continue;
l.FkX if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
uNLA/hL+n SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
0b4QcfB1[ //lParam的意义可看MSDN中WM_KEYDOWN部分
g"F vD_ }
sN;xHTY }
\QQw1c+ }
h19c*,0z! return CallNextHookEx( hHook, nCode, wParam, lParam );
Sl{]Z, }
0<fN<iR` qA5tMZ^w 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:
RtN5\ ^
@sg{_.~l BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
f7\$rx BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
JZ9w!)U <&Y7Q[ 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:
(Y:5u}*Y cbNrto9 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
6 fL=2a {
)%gigQZ+ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/u5MAl.<[ {
C#+Gkzq //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
6"z:s-V SaveBmp();
&h')snp:# return FALSE;
>q"mI6F }
IrM Ws86; …… //其它处理及默认处理
3u_[=a }
/0@'8f\I 0]fzjiaGt KP%A0 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。
R>yoMk/u /n&w|b% 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。
T5Yu+>3 up#W"`" 二、编程步骤
zXIVHC,"{ VPet1hAy 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";
bU7n1pzW,o ol[
2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
H)ud?vB6 MQ7N8 @!t 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;
,eW K~ pa JN,4#, 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;
^cn%]X#. +coVE^/w 5、 添加代码,编译运行程序。
.]JGCTB3 tDJts OL 三、程序代码
TY"8.vd K)QMxn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
jZx.MBVy] #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
*?:V)!.2z #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
W9+H/T7! #if _MSC_VER > 1000
I r]#u]Ap #pragma once
OWx-I\: #endif // _MSC_VER > 1000
j]Kpwf<NS #ifndef __AFXWIN_H__
{Cd Q)| #error include 'stdafx.h' before including this file for PCH
I6S!-i #endif
!{>'jvH #include "resource.h" // main symbols
jJml[iC class CHookApp : public CWinApp
5_ !s\ 5 {
*j6KQZ" public:
0}$Zr*|;Y CHookApp();
B<zoa= // Overrides
>g+yw1nC // ClassWizard generated virtual function overrides
~4fUaMT //{{AFX_VIRTUAL(CHookApp)
;SnpD)x@) public:
f{mWy1NH\ virtual BOOL InitInstance();
\,&,Q virtual int ExitInstance();
P;4Y%Dq~Qo //}}AFX_VIRTUAL
6Cfu19Dx //{{AFX_MSG(CHookApp)
H65><38X/ // NOTE - the ClassWizard will add and remove member functions here.
Vsw]v // DO NOT EDIT what you see in these blocks of generated code !
`\ _>P@qz //}}AFX_MSG
M#Kke9%2 DECLARE_MESSAGE_MAP()
Y7vUdCj };
MVP|l_2! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
_Wg?H:\ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
'guXdX]Gu BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
3CcCcZ9I BOOL InitHotkey();
h}0}g]IUx BOOL UnInit();
fqpbsM;M] #endif
5nF46c +Np[m$Z* //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
MkLXMwuQ& #include "stdafx.h"
kD;1+lNz #include "hook.h"
wIQ~a #include <windowsx.h>
_@2}zT #ifdef _DEBUG
!>RDHu2n #define new DEBUG_NEW
71b0MHNkvv #undef THIS_FILE
E.LD1Pm0 static char THIS_FILE[] = __FILE__;
aG_@--= #endif
M$YU_RPl+ #define MAX_KEY 100
Zaime #define CTRLBIT 0x04
,=>Ws:j #define ALTBIT 0x02
Z mVw5G
q #define SHIFTBIT 0x01
` `mnk>/ #pragma data_seg("shareddata")
K-,4eq! HHOOK hHook =NULL;
xbqFek$/r UINT nHookCount =0;
J,(@1R]KF: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
*yl?M<28 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
#z6[8B static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
G`D rY; static int KeyCount =0;
x%_VzqR` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
=
y@*vl #pragma data_seg()
RG&t0%yj} HINSTANCE hins;
]w,:T/Z} void VerifyWindow();
!WSY75 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
*Ri\7CqU"6 //{{AFX_MSG_MAP(CHookApp)
c!0u,6 // NOTE - the ClassWizard will add and remove mapping macros here.
~F"<N q // DO NOT EDIT what you see in these blocks of generated code!
(1IYOlG4 //}}AFX_MSG_MAP
eR3v=Q END_MESSAGE_MAP()
+P! ibHfP I4XnJ[N% CHookApp::CHookApp()
\qf0=CPw8 {
kz_gR;"(Z // TODO: add construction code here,
z( \4{Y
// Place all significant initialization in InitInstance
M}fk[Yr> }
$-=xG&fSz B%7Az!GX
CHookApp theApp;
/
f5q9sp8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Iip%er%b {
]SC|%B_* BOOL bProcessed=FALSE;
R?t_tmKXC! if(HC_ACTION==nCode)
<uYrYqN {
4%B0H> if((lParam&0xc0000000)==0xc0000000){// Key up
#Z. QMWq switch(wParam)
o;TS69|D {
VQ"Z3L3-4 case VK_MENU:
J8'1 ~$6 MaskBits&=~ALTBIT;
?kIyo break;
"hmLe(jo} case VK_CONTROL:
'@/1e\ -y MaskBits&=~CTRLBIT;
-1{f(/ break;
'Z*`~,Q case VK_SHIFT:
+0ALO%G;G" MaskBits&=~SHIFTBIT;
_`I}"`2H break;
*z'v default: //judge the key and send message
WKAG)4 break;
T>hrKn.!D: }
aPdEEqc\l for(int index=0;index<MAX_KEY;index++){
gc\/A\F< if(hCallWnd[index]==NULL)
<78*-Ob continue;
5jq @ nq6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
kzk8b?rOA {
jn4|gQ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
"4IrW6B$9 bProcessed=TRUE;
W:maE9E= }
^sKdN-{ }
AQ&vq$ }
`# U<'$ else if((lParam&0xc000ffff)==1){ //Key down
"XQ3mi`y switch(wParam)
=Vm3f^ {
0u;a*#V @ case VK_MENU:
ds9U9t MaskBits|=ALTBIT;
h#p[6}D break;
htT9Hrx case VK_CONTROL:
{'Y()p3kl MaskBits|=CTRLBIT;
;`O9YbP# break;
[uwn\- case VK_SHIFT:
5X>K#N MaskBits|=SHIFTBIT;
%[, R Q">v break;
=8vNOvA default: //judge the key and send message
KE.O>M,I. break;
U!{~L$S }
.-'_At4g for(int index=0;index<MAX_KEY;index++)
NCdDG {
-%Rw2@vU if(hCallWnd[index]==NULL)
KPVu-{_Fi continue;
2"T
b><^" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~:L5Ar< {
#Iu"qu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
S{RRlR6Z bProcessed=TRUE;
,.kmUd }
QOX'ZAB` }
<5E)6c_W) }
:>}7^1I if(!bProcessed){
k8\KCKql for(int index=0;index<MAX_KEY;index++){
3@nIoN'z if(hCallWnd[index]==NULL)
Q<NQ9lX continue;
]4ck)zlv
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
x<`^4|< SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
lVuBo& }
b<!' WpY- }
a@Vk(3Rx_ }
vz(=3C[ return CallNextHookEx( hHook, nCode, wParam, lParam );
g(auB/0s }
'qUM38 s 9M^5<8: BOOL InitHotkey()
@~Ys*]4UE {
a~ RY 8s if(hHook!=NULL){
^q_wtuQ nHookCount++;
8[.&ca/[ return TRUE;
ub!lHl }
,Ne9x\F else
x ;~;Ah.p hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
;HBKOe_3 if(hHook!=NULL)
a x)J!I18 nHookCount++;
p TaC$Ne return (hHook!=NULL);
y4! :l=E^ }
M,W-,l
] BOOL UnInit()
xQ';$& {
]#[4eaCg if(nHookCount>1){
|)xWQ KzA nHookCount--;
bo/<3gR return TRUE;
o~9sO=-O }
7IFZK\V BOOL unhooked = UnhookWindowsHookEx(hHook);
wpp!H<') if(unhooked==TRUE){
\03<dUA6 nHookCount=0;
8bQXC+bK hHook=NULL;
[m4M#Lg\0 }
w2!:>8o: return unhooked;
e$teh`
p3 }
DE7y\oO] AOkG.u-k BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
TV0sxod6 {
JhjH_) BOOL bAdded=FALSE;
b)x0;8< for(int index=0;index<MAX_KEY;index++){
iITMBS`} if(hCallWnd[index]==0){
:Jf</uP_ hCallWnd[index]=hWnd;
dGj0;3FI% HotKey[index]=cKey;
tK@7t0 HotKeyMask[index]=cMask;
V;g) P bAdded=TRUE;
-+u}u=z% KeyCount++;
HL]J=Gh break;
pacD7'1{
}
Pr>05lg }
=fH5r_n return bAdded;
BeLqk3'/ }
+)bn}L>Rl 3.Yg3&"Z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~ o2Z5,H {
*iY:R BOOL bRemoved=FALSE;
8(&6*-7= for(int index=0;index<MAX_KEY;index++){
yY!)2{F+ if(hCallWnd[index]==hWnd){
%I9f_5BlT8 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
/_HTW\7, hCallWnd[index]=NULL;
:/%Y"0 HotKey[index]=0;
qdy(C^(fa HotKeyMask[index]=0;
2@?X>, bRemoved=TRUE;
(,t[`z KeyCount--;
tBfmjxv break;
"g)bNgGV} }
',!jYh}Uxk }
OiXO<1'$ }
.gGO+8[N* return bRemoved;
7QnWw0 }
mA$86 X_ 1=5HQ~|[TO void VerifyWindow()
Z9NND {
3bXfR,U for(int i=0;i<MAX_KEY;i++){
6$:Q]zR#'H if(hCallWnd
!=NULL){ DA iS|x
if(!IsWindow(hCallWnd)){ livKiX`
hCallWnd=NULL; 5-ED\-
HotKey=0; N
P+vi@Ud
HotKeyMask=0; {$Uj&/IC
KeyCount--; Z*f%R\u
} bcvm]aPu
} Itv cN
} yH]Q;X'
} K!qOO
]" e'z
BOOL CHookApp::InitInstance() KQb&7k.
{ N$#~&
AFX_MANAGE_STATE(AfxGetStaticModuleState()); PYWFz
hins=AfxGetInstanceHandle(); 2HSFMgy
InitHotkey(); ZA. SX|m
return CWinApp::InitInstance(); 1ig*Xp[
} oJ*,a
`L 1+j
int CHookApp::ExitInstance() N8df1>mW
{ aNY-F)XWa
VerifyWindow(); ykJ+LS{+
UnInit(); z/h]Jos
return CWinApp::ExitInstance(); GDC@s<[k
} @[?ZwzY:9
j0X^,ot@m
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EI*~VFx
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~]RfOpq^w
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 64#Ri!RR}
#if _MSC_VER > 1000 #:N#i
#pragma once [;7zg@Sa
#endif // _MSC_VER > 1000 4i{Xs5zk
<9
^7r J
class CCaptureDlg : public CDialog n"aF#HR?0d
{ gm,AH85
// Construction i ]8bj5j{
public: Vt3*~Beb
BOOL bTray; ?wlRHVZ
BOOL bRegistered; yQ[ ;.<%v
BOOL RegisterHotkey(); 9XtO#!+48
UCHAR cKey; -`{W~yz
UCHAR cMask; h!JyFc
void DeleteIcon(); %AtT(G(n
void AddIcon(); L7aVj&xM
UINT nCount; s@iY'11
void SaveBmp(); %Vltc4QU
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Yq51+\d
// Dialog Data IO9|o!&>
//{{AFX_DATA(CCaptureDlg) :L+xEL
enum { IDD = IDD_CAPTURE_DIALOG }; Rc{R^5B
CComboBox m_Key; a%U#PF6
BOOL m_bControl; 6,jCO@!
BOOL m_bAlt; (B$>o.(JA
BOOL m_bShift; Y$"m*0
CString m_Path; T(Q ~b
CString m_Number; dmXfz D
//}}AFX_DATA wT- <#+L\
// ClassWizard generated virtual function overrides =H23eOS_#
//{{AFX_VIRTUAL(CCaptureDlg) J
;z`bk^
public: 2]9
2J
virtual BOOL PreTranslateMessage(MSG* pMsg); |n tWMm:(
protected: ^7? WR?!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _V1:'T8
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gCPH>8JwS0
//}}AFX_VIRTUAL 9O-~Ws ;
// Implementation `?R{sNr.
protected: _*?qOmf=
HICON m_hIcon; O9d"Z$~n=j
// Generated message map functions <`=Kt[_BQ
//{{AFX_MSG(CCaptureDlg) VVAc bAGJ
virtual BOOL OnInitDialog(); HBvyX`-
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @ :PMb Ub
afx_msg void OnPaint(); :x[()J~N
afx_msg HCURSOR OnQueryDragIcon(); Ri`6X_xU
virtual void OnCancel(); Mb[4_Dc
afx_msg void OnAbout(); R31Z(vY
afx_msg void OnBrowse(); (M1YOK) I
afx_msg void OnChange(); M_UmnqN1C
//}}AFX_MSG bri8o"
DECLARE_MESSAGE_MAP() +aEm]=3
}; $
-<(geI
#endif j7Y7&x"
v!ai_d^
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file fU
;H
#include "stdafx.h" c CDT27@
#include "Capture.h" '6){~ee
S
#include "CaptureDlg.h" Ck !"MK4
#include <windowsx.h> =`|BofR
#pragma comment(lib,"hook.lib") ZAy/u@qt
#ifdef _DEBUG \db=]L=|
#define new DEBUG_NEW CC"a2Hu/
#undef THIS_FILE M[z1B!rT
static char THIS_FILE[] = __FILE__; d7r!<u&/
#endif +FadOx7X$
#define IDM_SHELL WM_USER+1 yv]|Ce@8A
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cMT:Ij];
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {*hvzS{1d
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; e~(e&4pb
class CAboutDlg : public CDialog !idVF!xG
{ :7.k E
public: !lFNG:&`
CAboutDlg(); `i(b%$|^&Z
// Dialog Data nXhP ME
//{{AFX_DATA(CAboutDlg) NkNFx<9T
enum { IDD = IDD_ABOUTBOX }; z\UXnRL
//}}AFX_DATA Hc>yZ:c;
// ClassWizard generated virtual function overrides @|t]9
//{{AFX_VIRTUAL(CAboutDlg) w0j'>4
protected: b+ycEs=_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L"dN
$ A
//}}AFX_VIRTUAL j}/).O
// Implementation `W+-0F@Y?@
protected: bfncO[Q,?
//{{AFX_MSG(CAboutDlg) `S-l.zSZ4B
//}}AFX_MSG nIlTzrf6
DECLARE_MESSAGE_MAP() Ut'T!RD
}; $G)HU6hF*
*My9r.F5o
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d
oEuKT
{ yFmy
//{{AFX_DATA_INIT(CAboutDlg) o^(I+ <el
//}}AFX_DATA_INIT uK(]@H7~!c
} n CX{tqy
Cc{{9Ud
void CAboutDlg::DoDataExchange(CDataExchange* pDX) HbB8A#u
{ ]u-bJ
CDialog::DoDataExchange(pDX); AD`5:G
//{{AFX_DATA_MAP(CAboutDlg) =8*ru\L:hr
//}}AFX_DATA_MAP aj1,h)P
} t, /8U
"?aI
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4\|Q;@f
//{{AFX_MSG_MAP(CAboutDlg) d(V4;8a0
// No message handlers Bnk<e
//}}AFX_MSG_MAP S!$S'{f<
END_MESSAGE_MAP() y5aPs z
pT~3<
,
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) H}G 9gi
: CDialog(CCaptureDlg::IDD, pParent) (=WYi~2v
{ F|m &n&
//{{AFX_DATA_INIT(CCaptureDlg) 7 qn=W
m_bControl = FALSE; Z]DZ:dF
m_bAlt = FALSE; vuY X0&
m_bShift = FALSE; McS]aJfrk
m_Path = _T("c:\\"); 4<PupJ
m_Number = _T("0 picture captured."); l8+)Xk>
nCount=0; zd$?2y8
bRegistered=FALSE; ' ,]Aj!q
bTray=FALSE; pnp8`\cIH
//}}AFX_DATA_INIT $*N(feAs
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f2o6GC_
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); k%Tp9x$
} I9xu3izAmR
4 Cd5-I
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7_j t =sr
{ p8-$MF]]6
CDialog::DoDataExchange(pDX); K$}K2w
//{{AFX_DATA_MAP(CCaptureDlg) )jUPMIo
DDX_Control(pDX, IDC_KEY, m_Key); cc`u{F9
DDX_Check(pDX, IDC_CONTROL, m_bControl); {2T u_2>
DDX_Check(pDX, IDC_ALT, m_bAlt); X|!@%wuGC
DDX_Check(pDX, IDC_SHIFT, m_bShift); b5]<!~Fv:`
DDX_Text(pDX, IDC_PATH, m_Path);
T;{}bc&I
DDX_Text(pDX, IDC_NUMBER, m_Number); L.-qTh^P
//}}AFX_DATA_MAP AsuugcN*
} z(.,BB[
^["D>@yIR
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) G~u$BV'
//{{AFX_MSG_MAP(CCaptureDlg) nr&|
ON_WM_SYSCOMMAND() [hot,\+f
ON_WM_PAINT() "O$WfpKX
ON_WM_QUERYDRAGICON() OIw[sum2
ON_BN_CLICKED(ID_ABOUT, OnAbout) bw/mF5AsW
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *5s*-^'#!
ON_BN_CLICKED(ID_CHANGE, OnChange) Uea2WJpX
//}}AFX_MSG_MAP 8;<aco/62
END_MESSAGE_MAP() q\jq9)
e2V;6N
BOOL CCaptureDlg::OnInitDialog() @mg5vt!$`
{ 2g5 4<G*e
CDialog::OnInitDialog(); V,c^Vqy
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); '?.']U,: $
ASSERT(IDM_ABOUTBOX < 0xF000); 5$>buYF
CMenu* pSysMenu = GetSystemMenu(FALSE); Dt7z<1-)l
if (pSysMenu != NULL) nwfu@h0G
{ 0(u}z
CString strAboutMenu; d
{ P$}b
strAboutMenu.LoadString(IDS_ABOUTBOX); {0fQE@5@
if (!strAboutMenu.IsEmpty()) iI'ib-d
{ 'ta&qp
pSysMenu->AppendMenu(MF_SEPARATOR); b W/T}FND
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7 u Q +]d
} go6;_
} $K\e
Pfk
SetIcon(m_hIcon, TRUE); // Set big icon VE/m|3%t
SetIcon(m_hIcon, FALSE); // Set small icon |cuKC \
m_Key.SetCurSel(0); 0d:t=LKw)
RegisterHotkey(); D8E^[w!
CMenu* pMenu=GetSystemMenu(FALSE); I(&N2L$-
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *M`,#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `\ IaeMvo
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `<T4En
return TRUE; // return TRUE unless you set the focus to a control doX`NbA
} Uh1UZ
r
';.y`{/
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) RHvKWt
{ J%q)6&
if ((nID & 0xFFF0) == IDM_ABOUTBOX) k+i0@G'C(
{ A4d3hF~ l`
CAboutDlg dlgAbout; mrG#ox4$
dlgAbout.DoModal(); ]0(ZlpT
} N^F5J
else m@D :t5
{ %Rr_fSoV
CDialog::OnSysCommand(nID, lParam); !,b&e
} MZX@Gi<S[
} ;F%EW`7
[;-;{
*{G
void CCaptureDlg::OnPaint() (+zU!9}I1
{ n^qwE
if (IsIconic()) `)w=@9B)"
{ G'wW-|
CPaintDC dc(this); // device context for painting AhjCRYk+
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wXdt\@Qr
// Center icon in client rectangle D]'8BS3
int cxIcon = GetSystemMetrics(SM_CXICON); vt(}8C+
int cyIcon = GetSystemMetrics(SM_CYICON); XS&;8 PO
CRect rect; 9MQwc
GetClientRect(&rect); |KPNl\%ID
int x = (rect.Width() - cxIcon + 1) / 2; /Gb)BJk!
int y = (rect.Height() - cyIcon + 1) / 2;
}LEasj
// Draw the icon Lew
2Z
dc.DrawIcon(x, y, m_hIcon); &K=)YpT
} ,PKUgL}w
else v-!Spf
{ <+%y
CDialog::OnPaint(); 1`Bhis9X8
} #X{lV]Z
} [(8s\>T
<5FGL96
HCURSOR CCaptureDlg::OnQueryDragIcon() CL(D&8v8~
{ ||7x51-yj
return (HCURSOR) m_hIcon; ?f:0GE7
} ?e+y7K}"]
[V;u7Z\r-
void CCaptureDlg::OnCancel() W5Jb5
{ $Grk{]nT
if(bTray) I>-1kFma;
DeleteIcon(); ,CqGO %DY
CDialog::OnCancel(); Lke!VS!P&
} 2*n~r
Z%I 'sWOd
void CCaptureDlg::OnAbout() pOl6x iMx
{ *Kq;xM6Ck
CAboutDlg dlg; &wkbr2P
dlg.DoModal(); k#V\O2lb
} iM8l,Os]<f
}^n"t>Z8
void CCaptureDlg::OnBrowse() #&K}w0}k
{ i{HzY[
CString str; {irl}EeyC
BROWSEINFO bi; 1^WkW\9kO
char name[MAX_PATH]; :F"NF
ZeroMemory(&bi,sizeof(BROWSEINFO)); cvtn,Ml6
bi.hwndOwner=GetSafeHwnd(); 7s0y.i~
bi.pszDisplayName=name; AuB BSk8($
bi.lpszTitle="Select folder"; 00Ye
]j_
bi.ulFlags=BIF_RETURNONLYFSDIRS; 9r8bSV3`
LPITEMIDLIST idl=SHBrowseForFolder(&bi); k&u5`F
if(idl==NULL) ^p%3@)&
return; BGu<1$G
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); z<.6jx@
str.ReleaseBuffer(); uS xldc
m_Path=str; \x8'K
if(str.GetAt(str.GetLength()-1)!='\\') f/,8sGkX;
m_Path+="\\"; cy2K#
UpdateData(FALSE); criNeKa
} kp)1s>c
>#.du}t
void CCaptureDlg::SaveBmp() 4/2@^\?i)
{ 2jxh7\zE
CDC dc; jnFN{(VH
dc.CreateDC("DISPLAY",NULL,NULL,NULL); (~PT(B?
CBitmap bm; z<cPy)F]"
int Width=GetSystemMetrics(SM_CXSCREEN); pWoeF=+y]W
int Height=GetSystemMetrics(SM_CYSCREEN); JY D\VaW
bm.CreateCompatibleBitmap(&dc,Width,Height); ZRa~miKyM
CDC tdc; _znn `_N:v
tdc.CreateCompatibleDC(&dc); i$!K{H1{9
CBitmap*pOld=tdc.SelectObject(&bm); Y5mk*Q#q
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]4\6_J&
tdc.SelectObject(pOld); !}"P Hby5N
BITMAP btm; ORIXcj]
bm.GetBitmap(&btm); Ui"3'OU'
DWORD size=btm.bmWidthBytes*btm.bmHeight; 5^2P\y(?
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z =*h9,MY
BITMAPINFOHEADER bih; S<w?,Z
bih.biBitCount=btm.bmBitsPixel; |1+mHp
bih.biClrImportant=0; rGQ([e
bih.biClrUsed=0; GM0pHmC
bih.biCompression=0; t RTJ Q
bih.biHeight=btm.bmHeight; 0 \o5+
bih.biPlanes=1; qcBamf
bih.biSize=sizeof(BITMAPINFOHEADER); *OY
Nx4 k
bih.biSizeImage=size; (Ii+}Mfp
bih.biWidth=btm.bmWidth; e{ZS"e`!
bih.biXPelsPerMeter=0; ^8g<>,$
bih.biYPelsPerMeter=0; <7MxI@\
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :*tFW~<*b
static int filecount=0; !WD^To
CString name; A=wh&X
name.Format("pict%04d.bmp",filecount++); zhI"++
name=m_Path+name; 0T:U(5Y9
BITMAPFILEHEADER bfh; 5^{).fig
bfh.bfReserved1=bfh.bfReserved2=0; %hRH80W|
bfh.bfType=((WORD)('M'<< 8)|'B'); `k9a$@Xg
bfh.bfSize=54+size; )6U^!95
bfh.bfOffBits=54; Xc
G
CFile bf; R)]+>M-.
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ e1R<+`]
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {"*gX&;~
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (S63:q&g
bf.WriteHuge(lpData,size); VzuU0
bf.Close(); nS^,Sq\Ak
nCount++; QM=Y}
} '#612iZo
GlobalFreePtr(lpData); A+"'8%o9}
if(nCount==1) Es1T{<G|w
m_Number.Format("%d picture captured.",nCount); *HQ>tvUh
else zi+NQOhR
m_Number.Format("%d pictures captured.",nCount); OT3~5j1[
UpdateData(FALSE); \8Yv}wQ
} #nS crs@
#8B4*gAM
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) AaDMX,
{ p{O@ts:
if(pMsg -> message == WM_KEYDOWN) ~Z;.np(T
{ p3cb_
if(pMsg -> wParam == VK_ESCAPE) ]/?$DNjCc
return TRUE; xL!@$;J
if(pMsg -> wParam == VK_RETURN) 7$JE+gL/7
return TRUE; {$_Gjv
} .oe\wJ S6
return CDialog::PreTranslateMessage(pMsg); 2<uBC
} 8qv>C)~~`
|I=GI]I
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7n'Ww=ttI
{ ,y[w`Q\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Tl-Ix&37
SaveBmp(); qo:t"x^
return FALSE; 7k#0EhN 1>
} UH7FIM7kX
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ a)rT3gl
CMenu pop;
75T+6u
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :gx]zxK
CMenu*pMenu=pop.GetSubMenu(0); i [2bz+Z?
pMenu->SetDefaultItem(ID_EXITICON); 3\a VZx!
CPoint pt; Qs8Rb ]%|
GetCursorPos(&pt); b'(Hwc\ t
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,o6,(jJU
if(id==ID_EXITICON) xHuw ?4
DeleteIcon(); $8NM[R.8^4
else if(id==ID_EXIT) _>Oc>.MB
OnCancel(); aj$&~-/
R
return FALSE; iY3TB|tMt
} S1_):JvV
LRESULT res= CDialog::WindowProc(message, wParam, lParam); a}kPc}n\
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 3q0S}<h al
AddIcon(); #i-b|J+%
return res; U{8x.CJ]
} 7m;<b$
Y]+KsiOL
void CCaptureDlg::AddIcon() -;&-b >b
{ _5v]69C#
NOTIFYICONDATA data; Jr,**,wA
data.cbSize=sizeof(NOTIFYICONDATA); qE{L42
CString tip; k$w#:Sx
tip.LoadString(IDS_ICONTIP); 0Q:l,\lY
data.hIcon=GetIcon(0); Gs(;&fw
data.hWnd=GetSafeHwnd(); /*m6-DC
strcpy(data.szTip,tip); (*V:{_r
data.uCallbackMessage=IDM_SHELL; H:,Hr_;nC
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FLaj|Z~#)
data.uID=98; W$Z8AZ{E
Shell_NotifyIcon(NIM_ADD,&data); .-.b:gdO(
ShowWindow(SW_HIDE); CWS]821;
bTray=TRUE; cjf_,x
} LTnbBh*mc
G5!!^p~
void CCaptureDlg::DeleteIcon() }ZfdjF8N!
{ +Sg+% 8T
NOTIFYICONDATA data; UkM#uKr:
data.cbSize=sizeof(NOTIFYICONDATA); r.v.y[u
data.hWnd=GetSafeHwnd(); ;~Q`TWC
data.uID=98; Ap!i-E,"J
Shell_NotifyIcon(NIM_DELETE,&data); !w:pb7+G
ShowWindow(SW_SHOW); E#c9n%E\sz
SetForegroundWindow(); D]+@pKb
ShowWindow(SW_SHOWNORMAL); rVDOco+w
bTray=FALSE; 2mfG:^^c
} x3 01uf[
T&]IPOH9
void CCaptureDlg::OnChange() Vu Ey`c
{ 1cd3m
RegisterHotkey(); FdS'0#$
} jluv}*If
5ih5=qX
BOOL CCaptureDlg::RegisterHotkey() $!\Z_:
{ '$q3 Ze
UpdateData(); q
7hoI]
UCHAR mask=0; u Uh6/=y
UCHAR key=0; MUMB\K*$
if(m_bControl) F2dwT
mask|=4; !>6`+$=U
if(m_bAlt) \r-v]]_<d
mask|=2; 8,]wOxwqi
if(m_bShift) M~g@y$
mask|=1; Bh()?{q
key=Key_Table[m_Key.GetCurSel()]; Y|-:z@n6C
if(bRegistered){ hj=k[t|g}
DeleteHotkey(GetSafeHwnd(),cKey,cMask); R{{?wr6b$
bRegistered=FALSE; #[y2nK3zF
} OTmr-l6
cMask=mask; Kj#h9e
cKey=key; +Q+!#
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); c"NGE
return bRegistered; )wk9(|[o
} %Wt F\p
x=V3_HI/}
四、小结 >*]B4Q
,-1d2y
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。