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:
6)veuA3]
hb<cynY 一、实现方法
)A$xt)}P!{ Z,oCkv("n 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:
JRR,ooN*i $-p9cyk #pragma data_seg("shareddata")
xpp>5d
! HHOOK hHook =NULL; //钩子句柄
TT oW>RP# UINT nHookCount =0; //挂接的程序数目
v~A*?WU;n static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
<Gna}ALkg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
4"pU\g static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
N /zP!%L static int KeyCount =0;
!;U oZ~ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
6 Nws>(Ij #pragma data_seg()
"QvTn= )x<BeD 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
^ib
=fLu uD?Rs` DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
dJe
3DW : S%jW}v'; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
3lTnfc& cKey,UCHAR cMask)
J@OK"%12 {
7GvMKtuSK BOOL bAdded=FALSE;
&`,Y/Cbw for(int index=0;index<MAX_KEY;index++){
F5y&"Y_ if(hCallWnd[index]==0){
7&dK_x,a hCallWnd[index]=hWnd;
n1x"B>3 HotKey[index]=cKey;
*,zrg%8 HotKeyMask[index]=cMask;
G+&pq bAdded=TRUE;
m8V}E&6 KeyCount++;
sDY+J(Z break;
D/afa8>LQH }
g;Zy3
}
tAPf#7{|
return bAdded;
<kk!ns I }
oQA,57B //删除热键
6a<zZO`Z6+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}>EWFE` {
4bcd=a; BOOL bRemoved=FALSE;
!L@<?0xLW for(int index=0;index<MAX_KEY;index++){
E3]
8(P%D- if(hCallWnd[index]==hWnd){
I9dX\w} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
7?D?s!%\ hCallWnd[index]=NULL;
5,4m_fBoW HotKey[index]=0;
sm;kg= HotKeyMask[index]=0;
Cg|\UKfy$ bRemoved=TRUE;
s7 sTY KeyCount--;
{VXucGI| break;
1rS8+!9C }
D &@Iuo }
*U}ztH-+/ }
z4~p(tl return bRemoved;
4U16'd }
/\;m/cwrl" #WJ*)$A@& Pf/8tXs} DLL中的钩子函数如下:
O"/Sv'|H# 1Vx5tOq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
>q0%yh- {
0m=57c$O BOOL bProcessed=FALSE;
=6+99<G|%M if(HC_ACTION==nCode)
X#
/c7w- {
E N CWOj if((lParam&0xc0000000)==0xc0000000){// 有键松开
O;5lF switch(wParam)
HOF=qE*p {
ktS^^!,l% case VK_MENU:
i(OeE"YA MaskBits&=~ALTBIT;
nM Z)x- break;
U82mO+} case VK_CONTROL:
;TS%e[lFhQ MaskBits&=~CTRLBIT;
H Tv#2WX break;
q3#+G:nh case VK_SHIFT:
^8A[
^cgq MaskBits&=~SHIFTBIT;
H9PnJr8 \ break;
8]exsnZ default: //judge the key and send message
dGi
HO break;
K[
[6A: }
d=n{Wn{C for(int index=0;index<MAX_KEY;index++){
Lr5{c5M if(hCallWnd[index]==NULL)
qv}ECQ continue;
=<#G~8WYz if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w^ OB {
k].swvIi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
zA8@'`Id bProcessed=TRUE;
EFljUT?& }
6
Bdxdx*zt }
zTjie }
i>]PW|]
else if((lParam&0xc000ffff)==1){ //有键按下
l_yF;5|?z switch(wParam)
Q$:Q6/5. {
=>B"j`oR case VK_MENU:
S2;^ MaskBits|=ALTBIT;
1:<(Q2X% break;
M?UUT8, case VK_CONTROL:
Hz."4nhv MaskBits|=CTRLBIT;
Btm_S\1 break;
JO0o@M5H case VK_SHIFT:
7U_ob"`JV MaskBits|=SHIFTBIT;
FRZ]E)9Z]b break;
-l57!s~V default: //judge the key and send message
\20}/& break;
+(92}~RK }
}O>1tauI for(int index=0;index<MAX_KEY;index++){
[}j a\!P if(hCallWnd[index]==NULL)
`D
|/g; continue;
c6#E gN,X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@R50M (@W {
J sz=5` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
zMu9A| bProcessed=TRUE;
Fd\uTxykp }
V%PQlc.X }
#gO[di0WhC }
}Le]qoW[' if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
i79$D:PcLa for(int index=0;index<MAX_KEY;index++){
p|2GPrA]aL if(hCallWnd[index]==NULL)
1h?ve,$ continue;
qvB{vU if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
EI6kBRMo SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(w)%2vZ^ //lParam的意义可看MSDN中WM_KEYDOWN部分
,++HiYOG}e }
5rB>)p05[ }
Q|h$D~ }
'~K]=JP return CallNextHookEx( hHook, nCode, wParam, lParam );
\f?
K74 }
v0oVbHO5< ]zaTX?F: 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:
8+}rm6Y+ V~j^ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x0JW BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2SC-c `9) x>Q% hl 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:
Od~uYOL/B go AV+V7 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
j;@a~bks6z {
6`Tx meIP if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
M' z.d {
S,6/X.QBv //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
(KyOo,a SaveBmp();
2e%\aP`D2 return FALSE;
2}pZyS }
5H
XF3 …… //其它处理及默认处理
G`O*AQ}[ }
?[zw5fUDS r/'!#7dLG- {:!>Y1w> 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。
"/e)v{ g{6jN 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。
T^|k` #z.n?d2Gd 二、编程步骤
}W}( k2r z~vcwiYAP 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";
FNH)wk O)vGIp?f't 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
$rcv@-l TS|Bz2( 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;
E,.PT^au U MRFTwY 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;
/i>n1>~yn M{G}-QK_. 5、 添加代码,编译运行程序。
uPl}NEwU| $3 -QM 三、程序代码
bl
a`B=r EQ~<NzRp= ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<DR|r #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
0)d='3S #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
JK<[]>O #if _MSC_VER > 1000
3JQ7Cc> #pragma once
v(yJGEf0 #endif // _MSC_VER > 1000
'4i8&p`/ #ifndef __AFXWIN_H__
g@!U^mr*3 #error include 'stdafx.h' before including this file for PCH
bI:W4y>I= #endif
rIFW1`N}i #include "resource.h" // main symbols
BZQ}c<Nl class CHookApp : public CWinApp
<{k{Coy {
2YZ>nqy public:
6ScB:8M CHookApp();
*/IiL%g4u // Overrides
N`efLOMl]
// ClassWizard generated virtual function overrides
i%.NP;Qq]M //{{AFX_VIRTUAL(CHookApp)
ZtO$kK%q; public:
:<zIWje virtual BOOL InitInstance();
EB!ne)X virtual int ExitInstance();
<(>t"< //}}AFX_VIRTUAL
kH hp;< //{{AFX_MSG(CHookApp)
[yN+(^i // NOTE - the ClassWizard will add and remove member functions here.
hJ xL|5Uo // DO NOT EDIT what you see in these blocks of generated code !
i#b /.oa //}}AFX_MSG
kqih`E9P7B DECLARE_MESSAGE_MAP()
J78.-J5 j0 };
k^;n$r"i5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
ni{'V4A BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
M;<!C%K> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
i,ZEUdd*_ BOOL InitHotkey();
y*^UGJC: BOOL UnInit();
ds!nl1 #endif
nk tGO dVB#Np //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Ga02Zk #include "stdafx.h"
b]z_2h~` #include "hook.h"
^7+;XUyg #include <windowsx.h>
`$JvWN,kB #ifdef _DEBUG
W>a}g[Ad #define new DEBUG_NEW
!gW`xVGv #undef THIS_FILE
+^(_S9CO static char THIS_FILE[] = __FILE__;
lFt! #endif
s9sl*1n1m` #define MAX_KEY 100
Lp:VU-S #define CTRLBIT 0x04
VB*c1i #define ALTBIT 0x02
;=0mL, #define SHIFTBIT 0x01
R
q@|o5O #pragma data_seg("shareddata")
1z7+:~;l HHOOK hHook =NULL;
:5/Ue,~ag UINT nHookCount =0;
QD!NV* static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
+Xw%X3o) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
&2u
|7U. static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
+
GQ{{B static int KeyCount =0;
B1|nT?}J( static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
x+4K ,r; #pragma data_seg()
u]NsCHKlT HINSTANCE hins;
trrNu void VerifyWindow();
T2Z$*;,>T BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}:faHLYT //{{AFX_MSG_MAP(CHookApp)
:Y /aT[ // NOTE - the ClassWizard will add and remove mapping macros here.
}O~D3z4l0 // DO NOT EDIT what you see in these blocks of generated code!
A@<
! ' //}}AFX_MSG_MAP
?1\I/'E9 END_MESSAGE_MAP()
]pe7I
P TM6wjHFm CHookApp::CHookApp()
R4;1LZ8XzS {
h?dSn:Y\? // TODO: add construction code here,
9~Sa7P // Place all significant initialization in InitInstance
v[uVAbfQ }
_Kaqx"D aMe&4Q CHookApp theApp;
I-!7 EC2{! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
m,+PYq {
gWU#NRRc BOOL bProcessed=FALSE;
?@@$)2_*u if(HC_ACTION==nCode)
Bv~^keuj3t {
\m)s"Sh. if((lParam&0xc0000000)==0xc0000000){// Key up
d>F7i~W switch(wParam)
(ww4( {
WDxcV% case VK_MENU:
{'zS8 MaskBits&=~ALTBIT;
h*;c"/7 break;
sT1OAK\^ case VK_CONTROL:
5:gpynE| MaskBits&=~CTRLBIT;
moFrNcso break;
Ynf "g#( case VK_SHIFT:
I\1E=6" MaskBits&=~SHIFTBIT;
YvG$2F |_) break;
K3:z5j.X default: //judge the key and send message
j7_,V?5z break;
/Hk})o_ }
XO?WxL9k] for(int index=0;index<MAX_KEY;index++){
hb8oq3*x if(hCallWnd[index]==NULL)
PYi<iSr continue;
V#,|#2otZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2d|^$$#` {
:1f,%Z$,q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`_LQs9J0J bProcessed=TRUE;
^-?^iWQG }
$G0e1)D }
).,twf58 }
lv]U)p else if((lParam&0xc000ffff)==1){ //Key down
[4qvQ7Y
! switch(wParam)
t5l<Lm) {
Q3+%8zZI case VK_MENU:
[YlRz MaskBits|=ALTBIT;
oAN,_1v) break;
]2"UR_x case VK_CONTROL:
p?Ux1S MaskBits|=CTRLBIT;
T)22P<M8 break;
i885T' case VK_SHIFT:
F',1R"/} MaskBits|=SHIFTBIT;
*cFGDQ!
break;
h] )&mFiE" default: //judge the key and send message
u7J:ipyiq2 break;
of7'?]w }
9BOn8p;yz for(int index=0;index<MAX_KEY;index++)
5![ ILa_ {
se3EI1e if(hCallWnd[index]==NULL)
O
'#FVZ.g continue;
L6qK3xa} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
OFv-bb*YZ {
K
..Pn17t SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Pt-mLINvG bProcessed=TRUE;
(F;*@Z*R }
h3>u[cX% }
]E:L }
\A!Iln if(!bProcessed){
jl;N
Fk% for(int index=0;index<MAX_KEY;index++){
"<^
Vp-7r if(hCallWnd[index]==NULL)
a]V#mF |{ continue;
={h^X0<s9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
xV`)?hEXFh SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
7]5+%[Dg! }
&2y9J2aA }
&% (1?\~u }
5B1,,8P return CallNextHookEx( hHook, nCode, wParam, lParam );
o}wRgG }
g-x;a0MQx (ux9"r^g;x BOOL InitHotkey()
m=pH G {
o+^e+ptc if(hHook!=NULL){
iRW5*-66f nHookCount++;
2,|@a\H return TRUE;
TFbF^Kd#:d }
X2~KNw else
l~f9F`~' hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
v+C D{Tc if(hHook!=NULL)
)zP"Uuu nHookCount++;
! "08TCc< return (hHook!=NULL);
I2z7}*<u }
YSZ[~?+ BOOL UnInit()
Xn!=/<TIVz {
x41 t=E]( if(nHookCount>1){
03
v\v9<T nHookCount--;
$Ixd;`l* return TRUE;
0eCjK. }
OWN|W, BOOL unhooked = UnhookWindowsHookEx(hHook);
m|Z[8Tup if(unhooked==TRUE){
HqOnZ>D nHookCount=0;
uxq#q1 hHook=NULL;
(ke<^sv7! }
ryd}-_LL return unhooked;
wDh&S{N }
;ov}%t>UD ~3Z(0gujD BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~vR<UQz {
fG7-07 BOOL bAdded=FALSE;
z8};(I>) for(int index=0;index<MAX_KEY;index++){
E?mW4? if(hCallWnd[index]==0){
O_SM! !, hCallWnd[index]=hWnd;
O#U_mgfzJ HotKey[index]=cKey;
F|WH=s3 HotKeyMask[index]=cMask;
URTJA<r8D bAdded=TRUE;
NL ceBok KeyCount++;
jm|zn break;
r2Q) Q }
J=DD/Gp }
/z(s1G. return bAdded;
0*u X2* }
eR8>5:V_ .aIFm5N3? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Qnp.Na[JV {
&cx]7:; BOOL bRemoved=FALSE;
?Vr~~v"fg8 for(int index=0;index<MAX_KEY;index++){
N<lf,zGw
if(hCallWnd[index]==hWnd){
L\kT9wWK| if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
0k|/]zfb hCallWnd[index]=NULL;
tbi(e49S HotKey[index]=0;
1]jUiX=T HotKeyMask[index]=0;
^m^,:]I0P bRemoved=TRUE;
n~&e>_;(. KeyCount--;
tgm(tDL break;
$%J$ }
7)3cq}]O }
SB!m&;Tb }
ok9G 9|HA return bRemoved;
9\NP)Vm$^ }
0EP8MR SR $S!WW|9j. void VerifyWindow()
l_*:StyR+ {
%O&C\{J for(int i=0;i<MAX_KEY;i++){
t!vlZNc if(hCallWnd
!=NULL){ 6I\mhw!pQ
if(!IsWindow(hCallWnd)){ ;%aWA
hCallWnd=NULL; kPZ1OSX
HotKey=0; W.U|mNJ$
HotKeyMask=0; zzBq b\Ky
KeyCount--; Hz<)a(r!J
} zn{[]J
} QJ-?67_i
} (vf5qF^
} (G6N@>V(`
./;*LD
BOOL CHookApp::InitInstance() Th//u I+
{ UwxrYouv~@
AFX_MANAGE_STATE(AfxGetStaticModuleState()); }GTy{Y*&
hins=AfxGetInstanceHandle(); pNzGpCk
InitHotkey(); 4.mbW
return CWinApp::InitInstance(); |tS~\_O/
} tlFc+3
@'!61'}f
int CHookApp::ExitInstance() ETVT.R8
{ }"?KHy
VerifyWindow(); 5{|\h}
UnInit(); J#W>%2"s
return CWinApp::ExitInstance(); }t #Hq
} &^YY>]1Py
&_E*]Sj\
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7u^6`P
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) jQ31u
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rzqUI*4%
#if _MSC_VER > 1000 MPd#C*c
#pragma once 9? W38EF
#endif // _MSC_VER > 1000 DEC,oX!bI1
;3_Q7;y
class CCaptureDlg : public CDialog tgYIM`f
{ uL4@e
// Construction c$'UfW
public: vu.f B4
BOOL bTray; HnqZ7%jeN
BOOL bRegistered; ;mb
6i_
BOOL RegisterHotkey(); }q
?iJ?P
UCHAR cKey; )V}u1C-N
UCHAR cMask; \ca4X{x
void DeleteIcon(); ,O(XNA(C
void AddIcon(); `czXjZE
UINT nCount;
t5N4d
void SaveBmp(); WiviH#hF
CCaptureDlg(CWnd* pParent = NULL); // standard constructor aV(*BE/@F
// Dialog Data %3VwCuE
//{{AFX_DATA(CCaptureDlg) Gf'V68,l$
enum { IDD = IDD_CAPTURE_DIALOG }; XW Y0WDh:
CComboBox m_Key; N]yk<55
BOOL m_bControl; 95wV+ q*
BOOL m_bAlt; C>;yW7*g"
BOOL m_bShift; "5jZS6A]
CString m_Path; 6]gs{zG
CString m_Number; oa1a5+A
//}}AFX_DATA ?j0blXl
// ClassWizard generated virtual function overrides ($W9
?
//{{AFX_VIRTUAL(CCaptureDlg) HKcipDW
public: 4'rk3nT8
virtual BOOL PreTranslateMessage(MSG* pMsg); L6A6|+H%E
protected: c*1x*'j.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FJL9x,%6
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); IB*%PMTF
//}}AFX_VIRTUAL kxUGd)S
// Implementation "iZ-AG!C
protected: "a"[B'
HICON m_hIcon; ln=zGX.e
// Generated message map functions dadMwe_l0
//{{AFX_MSG(CCaptureDlg) zPkg3H
virtual BOOL OnInitDialog(); _mkI;<d]$T
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n`:l`n>N$
afx_msg void OnPaint(); nf
G:4k,
afx_msg HCURSOR OnQueryDragIcon(); Zz3#Kt5t3
virtual void OnCancel(); 1k/l7&n"
afx_msg void OnAbout(); Y+=@5+G
afx_msg void OnBrowse(); !7^He3
afx_msg void OnChange(); q2<J`G(tZ
//}}AFX_MSG X"1<G3m4
DECLARE_MESSAGE_MAP() R&alq
}; mmKrmM*1
#endif ~!nd'{{9
Dps{[3Y+
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Uq+
_#{2(
#include "stdafx.h" 7kwG_0QO
#include "Capture.h" */+s^{W7
#include "CaptureDlg.h" s]&y\Z
#include <windowsx.h> 4
?c1c
#pragma comment(lib,"hook.lib") 2b"5/$|6
#ifdef _DEBUG ?rK%;GTo
#define new DEBUG_NEW 88*RlxU
#undef THIS_FILE ^#Y6
E
static char THIS_FILE[] = __FILE__; 7S7!
#endif y-X'eCUz
#define IDM_SHELL WM_USER+1 Yptsq@s
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !fV6KkV
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }n7e_qy4
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; RQ'c~D)X
class CAboutDlg : public CDialog R`?^%1^N
{ s*X\%!l9
public: Rj&7|z
CAboutDlg(); Q+Fw =Xw
// Dialog Data !?>)[@2
k6
//{{AFX_DATA(CAboutDlg) 9]w0zUOL6
enum { IDD = IDD_ABOUTBOX }; hpyre B
//}}AFX_DATA \O?B9_
// ClassWizard generated virtual function overrides Jqj6L993e
//{{AFX_VIRTUAL(CAboutDlg) $"(YE #]|
protected: d&u/7rm
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iHn]yv3
#
//}}AFX_VIRTUAL .:raeDrd
// Implementation oQXkMKZ
protected: vWovR`
//{{AFX_MSG(CAboutDlg) y~=hM
//}}AFX_MSG vTEkh0Ys
DECLARE_MESSAGE_MAP() }"x*xN
}; 6V?RES;X
FlG^'UD
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \@3
{ 3ky+qoe
//{{AFX_DATA_INIT(CAboutDlg) v`w?QIB]
//}}AFX_DATA_INIT @]tGfr;le&
} j*`!o/=LI
zs:7!
void CAboutDlg::DoDataExchange(CDataExchange* pDX) N8q Z{CWn
{ n1>nnH]G
CDialog::DoDataExchange(pDX); F.5b|&@
//{{AFX_DATA_MAP(CAboutDlg) /xbZC{R
//}}AFX_DATA_MAP vUs7#*
} K-C,+ eI
piotd,
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9y*!W
//{{AFX_MSG_MAP(CAboutDlg) *SMPHWH[c
// No message handlers {kH^OZ^(e
//}}AFX_MSG_MAP B/hHkOoo
END_MESSAGE_MAP() 8m6 nw0
L)'rM-nkFh
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ] *VF Ws
: CDialog(CCaptureDlg::IDD, pParent) \X.=3lc&
{ 5yiiPK$qr
//{{AFX_DATA_INIT(CCaptureDlg) "4hpU]4j
m_bControl = FALSE; Z;'.pU~
m_bAlt = FALSE; 5l/l]
m_bShift = FALSE; pNQkKDbL+
m_Path = _T("c:\\"); #
pB:LPEsK
m_Number = _T("0 picture captured."); :_a]T-GL
nCount=0;
Z:J.FI@
bRegistered=FALSE; F'$S!K58
bTray=FALSE; u=}bq{
//}}AFX_DATA_INIT *>p(]_s,
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <?{}Bo0xG
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); AE4~M`6D
} lO:{tV
}lTZq|;A
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?EQ^n3U$
{ LA`VqJ
CDialog::DoDataExchange(pDX); akW3\(W}
//{{AFX_DATA_MAP(CCaptureDlg) qZsddll
DDX_Control(pDX, IDC_KEY, m_Key); UZ\*]mxT
DDX_Check(pDX, IDC_CONTROL, m_bControl); y*b.eO
DDX_Check(pDX, IDC_ALT, m_bAlt); Cm;qDvj+u
DDX_Check(pDX, IDC_SHIFT, m_bShift); Gb |}Su
DDX_Text(pDX, IDC_PATH, m_Path); %"[dGB$S
DDX_Text(pDX, IDC_NUMBER, m_Number); niHL/\7u
//}}AFX_DATA_MAP _6UAeZ*M
} "SU-^z
U%t/wq
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _RL-6jw#o
//{{AFX_MSG_MAP(CCaptureDlg) {I-a;XBX
ON_WM_SYSCOMMAND() 1H4Zgh
U
ON_WM_PAINT() #H6g&)Z_
ON_WM_QUERYDRAGICON() ,ANK3n\
ON_BN_CLICKED(ID_ABOUT, OnAbout) =8~R$z%
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ki~y@@3I
ON_BN_CLICKED(ID_CHANGE, OnChange) ?
TT8|Os
//}}AFX_MSG_MAP >6I.%!jU
END_MESSAGE_MAP() -yAnn
\FoxKOTp
BOOL CCaptureDlg::OnInitDialog() xOL)Pjo/m
{ pP0Vg'V
CDialog::OnInitDialog(); ?S&w0}R
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Xs>s|_T
ASSERT(IDM_ABOUTBOX < 0xF000); \_*MJ)h)X
CMenu* pSysMenu = GetSystemMenu(FALSE); 2yQ}Lxr(
if (pSysMenu != NULL) 3K#mF7)a
{ ?YO=J
CString strAboutMenu; .FKJyzL
strAboutMenu.LoadString(IDS_ABOUTBOX); .i+* #djx
if (!strAboutMenu.IsEmpty()) j|&DP-@g/
{ f' '{.L
pSysMenu->AppendMenu(MF_SEPARATOR); {x|kg;
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Sc/`=h]T
} iTLW<wG
} L8dU(P
SetIcon(m_hIcon, TRUE); // Set big icon !b7'>b'J<1
SetIcon(m_hIcon, FALSE); // Set small icon 3@yTzaq6
m_Key.SetCurSel(0); :6W^ S/pf
RegisterHotkey(); JEsLF{
CMenu* pMenu=GetSystemMenu(FALSE); bR'mV-2'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ("?&p3];b
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i-k >U}[%
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fK'.wX9
return TRUE; // return TRUE unless you set the focus to a control B [+(r
} GOf`Z'\xt
v_z..-7Dq+
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9k\)tWe
{ 5 o#<`_=J
if ((nID & 0xFFF0) == IDM_ABOUTBOX) \TbsoWX
{ `S \zqF<
CAboutDlg dlgAbout; D1X4|Q*SK
dlgAbout.DoModal(); "!%wh6`>Md
} M@~~f
else i*S|qX7``
{ FjZc#\^9
CDialog::OnSysCommand(nID, lParam); /mn-+u`K
} hIuMHq7h
} J3e:Y!
Q(510)
void CCaptureDlg::OnPaint() (*6m^
{ pWs\.::B
if (IsIconic()) ~)q g
{ oZvA~]x9\
CPaintDC dc(this); // device context for painting C$<"w,
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HDmx@E.@
// Center icon in client rectangle ZfPd0 p
int cxIcon = GetSystemMetrics(SM_CXICON); M{?.hq
int cyIcon = GetSystemMetrics(SM_CYICON); weAn&h|
CRect rect; @Od^k#
GetClientRect(&rect); -<qxO
int x = (rect.Width() - cxIcon + 1) / 2; Y?yo\(Cdx
int y = (rect.Height() - cyIcon + 1) / 2; }zFf0.82
// Draw the icon Al7<s
dc.DrawIcon(x, y, m_hIcon); &{%MjKJ._
} ^rv"o:lF
else TE^7P0bh
{ DY9fF4[9a
CDialog::OnPaint(); XTJvV
} EM=w?T
} /+VIw`E
,;_rIO"
HCURSOR CCaptureDlg::OnQueryDragIcon() 8|O=/m ^]
{ /X4yB"J>
return (HCURSOR) m_hIcon; CI`N8
f=v
} o`bo#A
xS'zZ%?
void CCaptureDlg::OnCancel() &lAQ &
{ A\K,_&x1Z
if(bTray) %*lp< D
DeleteIcon(); '\`6ot8
CDialog::OnCancel(); 0n3D~Xzd
} nV}8M
| h}B{D
void CCaptureDlg::OnAbout() nH@(Y&S
{ OifvUTl9b
CAboutDlg dlg; !X|k"km"
dlg.DoModal(); c-kA^z{f
} UVz/n68\k7
XS?gn.o\
void CCaptureDlg::OnBrowse() #'@ilk/.
{ c<wavvfUo
CString str; L=O lyHO
BROWSEINFO bi; 62[8xn=(%
char name[MAX_PATH]; y4@gGC=
ZeroMemory(&bi,sizeof(BROWSEINFO)); -gS"pE^1
bi.hwndOwner=GetSafeHwnd(); O:Va&Cyj*
bi.pszDisplayName=name; k[\a)WcY8
bi.lpszTitle="Select folder"; M;+IZr Wkl
bi.ulFlags=BIF_RETURNONLYFSDIRS; ?}}qu'N:N
LPITEMIDLIST idl=SHBrowseForFolder(&bi); L@RIZu>ZW+
if(idl==NULL) !KcWH9
return; V1B(|P
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pMR,#[U<
str.ReleaseBuffer(); }aF
m_Path=str; ~i ,"87$[
if(str.GetAt(str.GetLength()-1)!='\\') ;I}'}
m_Path+="\\"; x5}lgyt
UpdateData(FALSE); [dB$U}SEj
} F; 8*H1
a 7#J2 r
void CCaptureDlg::SaveBmp() wpXgPVZT
{ s"%lFA"-
CDC dc; !^w
E/
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7"4z+w
CBitmap bm; P(,?#+]-
int Width=GetSystemMetrics(SM_CXSCREEN); {u"8[@@./
int Height=GetSystemMetrics(SM_CYSCREEN); VT\"q1)p
bm.CreateCompatibleBitmap(&dc,Width,Height); .@#A|fgv
CDC tdc; !E2W\chi
tdc.CreateCompatibleDC(&dc); ***a2Z/(
CBitmap*pOld=tdc.SelectObject(&bm); aI3CNeav
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h|D0z_f
tdc.SelectObject(pOld); os4{0Mxu
BITMAP btm; +1rkq\{l
bm.GetBitmap(&btm); >Lft9e
DWORD size=btm.bmWidthBytes*btm.bmHeight; _,haD)1g~
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); MHU74//fe
BITMAPINFOHEADER bih; ALc`t(..}A
bih.biBitCount=btm.bmBitsPixel; 6*45Vf
bih.biClrImportant=0; >yB(lKV
bih.biClrUsed=0; TP%+.#Fu
bih.biCompression=0; _%/}>L>-`8
bih.biHeight=btm.bmHeight; L\%orLEmK
bih.biPlanes=1; ^v&D;<&R
bih.biSize=sizeof(BITMAPINFOHEADER); e}hmS 1>H
bih.biSizeImage=size; :e<7d8E5n{
bih.biWidth=btm.bmWidth; Qm4o7x{q
bih.biXPelsPerMeter=0; [P~hjmJ(y
bih.biYPelsPerMeter=0; C0jj(ku&
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @-HG`c ct
static int filecount=0; I%j_"r9-I
CString name; H/+B%2Zj
name.Format("pict%04d.bmp",filecount++); g[H',)A)
name=m_Path+name; 3^?ZG^V
BITMAPFILEHEADER bfh; q1?&Ev^
bfh.bfReserved1=bfh.bfReserved2=0; 99xEm
bfh.bfType=((WORD)('M'<< 8)|'B'); nUS| sh
bfh.bfSize=54+size; S35~Cp
bfh.bfOffBits=54; _ :Ag?2
CFile bf; En{`@JsM
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ U8.7>ENnP&
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @$9'@")
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f>`dF?^6
bf.WriteHuge(lpData,size); 9h&R]yz;
bf.Close(); LbEM^D
nCount++; f| _u7"OX
} /!h;c$
GlobalFreePtr(lpData); Rk!X]-`=
if(nCount==1) R;,g1m|]
m_Number.Format("%d picture captured.",nCount); %yBB?cp+_
else s\!>"J bAQ
m_Number.Format("%d pictures captured.",nCount); Ar*^;/
UpdateData(FALSE); tW
WWx~k
} .p0Clr!
*g?Po+ef%
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) L:XC
{ p
sL?Y
if(pMsg -> message == WM_KEYDOWN) <-D/O$q
{ Mmpfto%i
if(pMsg -> wParam == VK_ESCAPE) x
}Ad_#q
return TRUE; ^[:p|U2mA
if(pMsg -> wParam == VK_RETURN) )W/;=K
return TRUE; F*"}aP$
} -py@DzK
return CDialog::PreTranslateMessage(pMsg); _ODbY;M
} X}+>!%W!}
3EJt%}V$k
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) i3rH'B-I.
{ hzk cP
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 89r DyRJ;
SaveBmp(); +$g}4
return FALSE; x)( |[
} 0u\GO;
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H\TI[JPAl
CMenu pop; |PC*=ykT3
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1t)il^p4[;
CMenu*pMenu=pop.GetSubMenu(0); &Z`#cMR{H
pMenu->SetDefaultItem(ID_EXITICON); >0"+4<72
CPoint pt; )c `7( nY
GetCursorPos(&pt); sBcPq SMby
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iof-7{+3_
if(id==ID_EXITICON) zux{S;:?
DeleteIcon(); 30SW\@
else if(id==ID_EXIT)
'FDef#P<
OnCancel(); G K7![p
return FALSE; _H5o'>=
} S:OO0<W
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H '
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /Njd[=B
AddIcon(); 3.*8)NW
return res; p>4-s, W
} ; #&yn=^
INJEsz
void CCaptureDlg::AddIcon() NxsBX:XDn
{ <i&_ooX
NOTIFYICONDATA data; 4rLL[??
data.cbSize=sizeof(NOTIFYICONDATA); z*a:L} $
CString tip; )v.=jup[
tip.LoadString(IDS_ICONTIP); i%0ur}p
data.hIcon=GetIcon(0); Sy0$z39
data.hWnd=GetSafeHwnd(); eQ]~dA8>
strcpy(data.szTip,tip); ivN&HAxI@
data.uCallbackMessage=IDM_SHELL; _sTROd)Vh
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Y2~nBb
data.uID=98; 67Th;h*sh
Shell_NotifyIcon(NIM_ADD,&data); w|K'M?N14
ShowWindow(SW_HIDE); NgP&.39U
bTray=TRUE; ~v|>xqWV
} %5"9</a&G
\D*KGd]M0
void CCaptureDlg::DeleteIcon() H _zo1AW
{ hvsWs.;L'
NOTIFYICONDATA data; mc? Vq
data.cbSize=sizeof(NOTIFYICONDATA); J;8IY=
data.hWnd=GetSafeHwnd(); lww!-(<ww
data.uID=98; 3
:<WY&9
Shell_NotifyIcon(NIM_DELETE,&data);
/} b03
ShowWindow(SW_SHOW); + |n*b
SetForegroundWindow(); BHU6t<G
ShowWindow(SW_SHOWNORMAL); gc-@"wI?
bTray=FALSE; w"Gm; B4
} (ROY?5
@c
_x(o*v[Pt
void CCaptureDlg::OnChange() kuszb~`zPY
{ BBwy,\o#
RegisterHotkey(); *zbNd:i9
} Krqtf
W{6|tx)
BOOL CCaptureDlg::RegisterHotkey() Z`ID+
{ (MxQ+D\
UpdateData(); l5!|I:/*;
UCHAR mask=0; s(/;U2"e
UCHAR key=0; 3Q.#c,`jV
if(m_bControl) N4F.Y"R$(
mask|=4; !Qu"BF
if(m_bAlt) Jh,]r?Bd
mask|=2; 96( v
if(m_bShift) tE<H|_{L
mask|=1; 6t[+pL\b
key=Key_Table[m_Key.GetCurSel()]; /Kql>$I
if(bRegistered){ {Aw#?#GPW
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZxGJzakB5$
bRegistered=FALSE; CkOz
} 6-N?mSQU
cMask=mask; ;K:zmH
cKey=key; t5\-v_mG=&
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )~)J?l3{
return bRegistered; Dp,L/1GQ8
} JjtNP)We
B+P(M!m3
四、小结 e^6)Zz1\
e$<0
7Oc
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。