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:
bB-v ar
vNbA/sM 一、实现方法
N3<Jh E6k&r} 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:
>lmL P1n@E*~V5 #pragma data_seg("shareddata")
Uj)]nJX HHOOK hHook =NULL; //钩子句柄
iurB8~Y UINT nHookCount =0; //挂接的程序数目
}i:'f2/ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
VHCzlg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
h6 i{5\7. static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Gu).*cU static int KeyCount =0;
rR~X>+K static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
H)Ge#=;ckQ #pragma data_seg()
2\de |' ~*Qpv&y) 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。
m9@n nif'l/@" 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:
Rn_c9p
9lCKz
!E BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
V&H8-,7z cKey,UCHAR cMask)
(02(:;1 {
gUA}%YXe BOOL bAdded=FALSE;
nh)R for(int index=0;index<MAX_KEY;index++){
`F 8;{`a if(hCallWnd[index]==0){
H~]o]uAi" hCallWnd[index]=hWnd;
qhtAtP>i" HotKey[index]=cKey;
{W<-f? HotKeyMask[index]=cMask;
jqWvLBU! bAdded=TRUE;
^ZUgDQduc KeyCount++;
~+yo;[1Yc break;
GTl (i*
}
Els= :4 }
|"w<CKlQ return bAdded;
J94YMyOo }
d|RmU/) //删除热键
|LE++t*X~ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GQq'~Lr5 {
e622{dfVS BOOL bRemoved=FALSE;
v^fOT5\ for(int index=0;index<MAX_KEY;index++){
1o 78e2B if(hCallWnd[index]==hWnd){
:0/o?'s if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
b]?;R hCallWnd[index]=NULL;
x)ZH;) HotKey[index]=0;
RLNuH2y; HotKeyMask[index]=0;
1iL
xXd bRemoved=TRUE;
XF$]KAL0 KeyCount--;
Tk&9Klo break;
%nf=[f }
g8A{aHb1} }
!13
/+ u }
u#k,G` return bRemoved;
&W//
Ox
)f }
iGVb.=) #-j!
;? B-'BJ|*4I DLL中的钩子函数如下:
8k?L{hF|nW }AZx/[k
|z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
*[:CbFE0y {
Yka&Kkw BOOL bProcessed=FALSE;
\ZWmef if(HC_ACTION==nCode)
_J~ta. {
ik0Q^^1?Y if((lParam&0xc0000000)==0xc0000000){// 有键松开
ULmdt
switch(wParam)
{0WIDD {
4Xk;Qd case VK_MENU:
F6]!?@ MaskBits&=~ALTBIT;
4 ~YQ\4h= break;
Prz+kPP case VK_CONTROL:
P Xn>x8z MaskBits&=~CTRLBIT;
1'm`SRX#e break;
{<4?o?
1g case VK_SHIFT:
6@;L$QYY-V MaskBits&=~SHIFTBIT;
_|wY[YJ[ break;
}SN44 di( default: //judge the key and send message
=M{CZm break;
} %CbZ/7& }
T-2p`b}hW for(int index=0;index<MAX_KEY;index++){
o\;"|O} if(hCallWnd[index]==NULL)
N<"6=z@w+ continue;
{&u7kWD| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
T^;Jz!e {
ss@}Dt^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
He-Ja bProcessed=TRUE;
UJ)M:~O }
O8~U<'=* }
JX$NEq( }
(g2r\hI else if((lParam&0xc000ffff)==1){ //有键按下
^
R^N`V switch(wParam)
B "F`OS[ {
Q*&aC|b& case VK_MENU:
P9mxY*K)%5 MaskBits|=ALTBIT;
vp75u93 break;
2n;;Tso" case VK_CONTROL:
!^bB/e MaskBits|=CTRLBIT;
r2F break;
FoD/Q
case VK_SHIFT:
})Mv9~&S MaskBits|=SHIFTBIT;
cc(r,ij~4 break;
sa(M66KkU default: //judge the key and send message
-WBz]GW4r break;
o7a6 )2JK }
+IO1ipc4cE for(int index=0;index<MAX_KEY;index++){
<Dj$0g if(hCallWnd[index]==NULL)
+6M+hO] continue;
0H&U=9'YT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%OTA5 {
'Kzr-)JS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
U[e8K bProcessed=TRUE;
1C,C) }
.6 ?>t!&W }
} .H Fm'p }
&J/4J if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
3auJ^B} for(int index=0;index<MAX_KEY;index++){
NuS|X
if(hCallWnd[index]==NULL)
{}J@+Zsi continue;
(06Vcqg if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;ko[(eFN@ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+=*m! 7Mr //lParam的意义可看MSDN中WM_KEYDOWN部分
&;h~JS= }
p1VahjRE- }
1s}NQ3 }
0.BUfuuh return CallNextHookEx( hHook, nCode, wParam, lParam );
&kjwIg{ }
fzFvfMAU R4~zL!7; 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
Wt)SdF=U/ ZH$sMh<xg BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
#C,f/PXfaB BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
bu"68A;> 3+8" 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:
,+f0cv4 m~j\?mb{+ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
~Riu*< {
01{r^ZT`RH if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
?y*+^E0 {
6`4W, //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Y zBA{FE SaveBmp();
/@:up+$ return FALSE;
nc\C4g }
? __aVQ7 …… //其它处理及默认处理
d7_ g
u }
0n<(*bfW w^dueP7J IzGB 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。
Oa\ `; rTsbP40 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。
Zu0;/_rN 3b?OW7H 二、编程步骤
8pq-nuf|K lA.;ZD! 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";
aO^:dl5 wSJ]3gJM` 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
%7(kP}y*
>NH4A_ 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;
Oa}V>a VTJIaqw 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#]aV]IT 1t\b a1x 5、 添加代码,编译运行程序。
Z4HA94 D-o7yc"K 三、程序代码
b,rH&+2H 2i7i\?<. ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
s?@)a,C%k #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<nb3~z1 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
$p0 /6c #if _MSC_VER > 1000
DD@)z0W #pragma once
O+E1M=R6h #endif // _MSC_VER > 1000
S}m$,<x #ifndef __AFXWIN_H__
1(%>`=R8 #error include 'stdafx.h' before including this file for PCH
@Ge>i5q #endif
oxMUW<gYd #include "resource.h" // main symbols
aW=By)S!Y class CHookApp : public CWinApp
PHRGhKJW}) {
9b" 9m*gC public:
`s>UU- 9 CHookApp();
4{*tn"y // Overrides
|ilv|U V // ClassWizard generated virtual function overrides
oTF^<I-C //{{AFX_VIRTUAL(CHookApp)
0~Iu7mPY public:
yNrinYw virtual BOOL InitInstance();
dcl.wD0~V virtual int ExitInstance();
e'~-`Z9-) //}}AFX_VIRTUAL
/]/>jz> //{{AFX_MSG(CHookApp)
,W1a<dl // NOTE - the ClassWizard will add and remove member functions here.
BLL]^qN;Y // DO NOT EDIT what you see in these blocks of generated code !
^zaKO'KcV //}}AFX_MSG
|-(IJG#) DECLARE_MESSAGE_MAP()
jJ*@5?A };
XdGpW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
J7'f@X~nM BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
X!7VyE+n BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
] Wx>)LT BOOL InitHotkey();
IP30y>\ BOOL UnInit();
S]e j=6SP #endif
d)04;[= fjIcB+Z //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
_e?q4>B)c #include "stdafx.h"
]DC;+;8Jc #include "hook.h"
\);.0 #include <windowsx.h>
VX^o"9Ntl #ifdef _DEBUG
4pmTicA~ #define new DEBUG_NEW
jFuC=6aF #undef THIS_FILE
]g;^w?9h static char THIS_FILE[] = __FILE__;
J+)'-OFt0 #endif
MvFM, #define MAX_KEY 100
J$#h(D% #define CTRLBIT 0x04
&jV9* #define ALTBIT 0x02
?~"`^|d
#define SHIFTBIT 0x01
^w:OS5 %R #pragma data_seg("shareddata")
0W T#6D HHOOK hHook =NULL;
*M>
iZO*@ UINT nHookCount =0;
JcTp(fnW.~ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
vix&E`0yD static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
0PnD|]9: static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
2qZa9^} static int KeyCount =0;
3[0w+{(Q static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Yz&*PPx #pragma data_seg()
QU^/[75Ea0 HINSTANCE hins;
xab]q$n]k void VerifyWindow();
87QZun% BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
="uKWt6n' //{{AFX_MSG_MAP(CHookApp)
V I6\ // NOTE - the ClassWizard will add and remove mapping macros here.
M"=8O>NZ2 // DO NOT EDIT what you see in these blocks of generated code!
$h G;2v //}}AFX_MSG_MAP
I86e&"40 END_MESSAGE_MAP()
'oz hz2s Q~fwWp-J CHookApp::CHookApp()
hq/J6 M {
)t|^Nuj8 // TODO: add construction code here,
5/& 1Oxo // Place all significant initialization in InitInstance
`%-4>jI9- }
X^zYQ6t g3|BE2? CHookApp theApp;
/635B*g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
33Ssylno {
#/OUGeJ BOOL bProcessed=FALSE;
|h5kg<Zgo if(HC_ACTION==nCode)
I3Lg?bZ {
\\=.6cg<K if((lParam&0xc0000000)==0xc0000000){// Key up
#F_'}?09% switch(wParam)
FE/$(7rM {
zuUT S[ case VK_MENU:
i]it5 MaskBits&=~ALTBIT;
<=q*N;=T, break;
puFXPw.3 case VK_CONTROL:
+$>N]1 MaskBits&=~CTRLBIT;
G1}~.%J break;
1#grB(p? case VK_SHIFT:
x!'7yx MaskBits&=~SHIFTBIT;
hVMYB_<~ break;
X?tj$ default: //judge the key and send message
o_iEkn break;
pG/
NuImA }
yh S#&)O for(int index=0;index<MAX_KEY;index++){
WK
pUn8&N
if(hCallWnd[index]==NULL)
/&CUspb continue;
CV '&4oq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*"1~bPl {
; ;<J
x. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
l`SK*Bm~< bProcessed=TRUE;
./$
<J6-J }
q1 H=/[a }
53B.2
4Tm }
S[vRw]* else if((lParam&0xc000ffff)==1){ //Key down
JW=uK$s O switch(wParam)
Yt -W1vl {
@4;&hP2Z: case VK_MENU:
Osnyd+dJY MaskBits|=ALTBIT;
cL#-*_( break;
#C4|@7w% case VK_CONTROL:
:]'q#$! MaskBits|=CTRLBIT;
d!o.ASL{ break;
t) LU\! case VK_SHIFT:
Q/p(#/y#b MaskBits|=SHIFTBIT;
IWQ&6SDW$z break;
1Yud~[c default: //judge the key and send message
cn$5:%IK break;
ji}#MBac }
C1 W>/?XC for(int index=0;index<MAX_KEY;index++)
d7E7f {
hHpx?9O+! if(hCallWnd[index]==NULL)
tyB)HF continue;
im=5{PbJ^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
29%=: *R$ {
(wife#)~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
hGvq T, ' bProcessed=TRUE;
,s0
9B }
@d&g/ccMxd }
'GkvUrD9D$ }
<KtBv Ip] if(!bProcessed){
5:c;RRn for(int index=0;index<MAX_KEY;index++){
+kM\
D~D1 if(hCallWnd[index]==NULL)
{ih:FcI
continue;
;d4y{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
6z Ay)~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Jz0K}^Dj[ }
N r<9u$d9= }
V7:\q^$ }
r&SO:#rOSM return CallNextHookEx( hHook, nCode, wParam, lParam );
I:F
<vE }
/u=aX >5.zk1&H BOOL InitHotkey()
`$at9 {
okz]Qc>G if(hHook!=NULL){
EY~7oNfc`R nHookCount++;
!
tGiTzzp return TRUE;
UxeL
cUP }
y1iX!m~) else
?;^5ghY$ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
(k8Z=/N~ if(hHook!=NULL)
/_q#ah nHookCount++;
M|k&TTV return (hHook!=NULL);
vO]J]][ }
'*4iqPR; BOOL UnInit()
MI\]IQU {
Ir/:d]N* if(nHookCount>1){
\#++s&06 nHookCount--;
3w6&&R9 return TRUE;
X'@'/[? }
RJx{eck% BOOL unhooked = UnhookWindowsHookEx(hHook);
zka?cOmYF[ if(unhooked==TRUE){
^sV|ck nHookCount=0;
80}4/8 hHook=NULL;
kbhX?; <` }
x6ahZ return unhooked;
Lyr2(^#: }
G?<pBMy LJWTSf"f? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_dr*`yXi {
<GaT|Hhc= BOOL bAdded=FALSE;
,E?4f
@|X for(int index=0;index<MAX_KEY;index++){
Y%g "Y if(hCallWnd[index]==0){
V9T
4+ hCallWnd[index]=hWnd;
N<liS3> HotKey[index]=cKey;
/'4Q{8.a HotKeyMask[index]=cMask;
EjSD4 bAdded=TRUE;
yp p 4L|R KeyCount++;
"y$ qrN- break;
^wJEfac }
)|RZa|`-G }
f&c]LH_ return bAdded;
A*F9\mjI5 }
nWGR5*e: x%6hM|U BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
3D[=b%2\ {
TT7PQf > BOOL bRemoved=FALSE;
P?J kP for(int index=0;index<MAX_KEY;index++){
/PqUXF if(hCallWnd[index]==hWnd){
:G 5C ]'t if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
6R2uWv hCallWnd[index]=NULL;
JpK[&/Ct HotKey[index]=0;
+_~,86 HotKeyMask[index]=0;
OR;&TbWF(R bRemoved=TRUE;
p+[}Hxx= KeyCount--;
)b92yP{ break;
EeB3 } }
$)*xC!@6X }
'#H")i }
1Nj=B_T return bRemoved;
f=m/
-mAA }
u!Bk,}CE` &$#99\/ void VerifyWindow()
.S!-e$EJ {
O>AFF@= for(int i=0;i<MAX_KEY;i++){
:B.G)M\ if(hCallWnd
!=NULL){ fhRjYYGI
if(!IsWindow(hCallWnd)){ F\LsI;G
hCallWnd=NULL; ]fE3s{y
&-
HotKey=0; p=B?/Sqa
HotKeyMask=0; U5<@<j(@
KeyCount--; o/1JO_41
} RZh}:
} +"uwV1)b"
} <d"Gg/@a
} f`|G]da-3o
El
(/em
BOOL CHookApp::InitInstance() 8l23%iWxe
{ S+ebO/$>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); b_vTGl1_6
hins=AfxGetInstanceHandle(); 3dG4pl~
InitHotkey(); M&yqfb[
return CWinApp::InitInstance(); J=*K"8Qr
} s.:r;%a
aZKXD! 4
int CHookApp::ExitInstance() fHfY}BQS
{ y5u\j{?Te
VerifyWindow(); CH;;V3
UnInit(); tpYa?ZCM
return CWinApp::ExitInstance(); eYEc^nC,c)
} [Oy >R
FT.@1/ )
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~`R1sSr"
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) w$>3pQ8d
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I4ilR$jg
#if _MSC_VER > 1000 Y Pszk5hn
#pragma once N9]xJgTze
#endif // _MSC_VER > 1000 4ht\&2&:
uyT/Xzo3
class CCaptureDlg : public CDialog Rp/-Pv
{ x?L hq2
// Construction V]c5
Z$Bd
public: }V]eg,.BJ
BOOL bTray; }bMWTT
BOOL bRegistered; 2xTT)9Tq*
BOOL RegisterHotkey(); ?@UAL.y
UCHAR cKey; yvxl_*Ds8
UCHAR cMask; ^>m^\MuZ
void DeleteIcon(); uTGcQs}
void AddIcon(); @~o`#$*|
UINT nCount; 3eKQ<$w
void SaveBmp();
YqU/\f+
CCaptureDlg(CWnd* pParent = NULL); // standard constructor JJ5C}`(
// Dialog Data frqJN
//{{AFX_DATA(CCaptureDlg) z*LiweR-
enum { IDD = IDD_CAPTURE_DIALOG }; Of`c`-<j
CComboBox m_Key; &N\[V-GP2G
BOOL m_bControl; 0=;YnsY
BOOL m_bAlt; ' qy#)F
BOOL m_bShift; 7lU.Nit
CString m_Path; ow.j+<M
CString m_Number; 5AOfp2O
//}}AFX_DATA 2OalAY6RS
// ClassWizard generated virtual function overrides J#7y<
s
//{{AFX_VIRTUAL(CCaptureDlg) \ e,?rH
public: 5@P-g
virtual BOOL PreTranslateMessage(MSG* pMsg); te'*<HM
protected: JD~a UB%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &71e5<(dG
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); (F8AL6
//}}AFX_VIRTUAL %MJ;Q?KB
// Implementation 8#59iQl
protected: ~>%DKJe
HICON m_hIcon; Zq*eX\#C
// Generated message map functions uA\J0"0;}
//{{AFX_MSG(CCaptureDlg) BXhWTGiG
virtual BOOL OnInitDialog(); s;{K!L@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ez*jjm
afx_msg void OnPaint(); )#`H."Z
afx_msg HCURSOR OnQueryDragIcon(); AyTx' u
virtual void OnCancel(); Z@J.1SaB
afx_msg void OnAbout(); SLoo:)
afx_msg void OnBrowse(); rAXX}"l6s
afx_msg void OnChange(); Q6^x8
//}}AFX_MSG 6fwY$K\X
DECLARE_MESSAGE_MAP() T=\!2gt
}; )^
<3\e
#endif [xdj6W
- DL"-%X.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f=I:DkR
#include "stdafx.h" ~O4|KY
#include "Capture.h" ~L4eZ
#include "CaptureDlg.h" '[Gm8K5
#include <windowsx.h> Fu)Th|5GZ
#pragma comment(lib,"hook.lib") -&Gfh\_NW
#ifdef _DEBUG k'+}92
o
#define new DEBUG_NEW ,
Oli
#undef THIS_FILE @vs@>CYdz
static char THIS_FILE[] = __FILE__; 8(xw?|D7
#endif (wA?;]q(
#define IDM_SHELL WM_USER+1 #@Y/{[s|@
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2k1aX~?
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QnKC#
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]k+m=OR{/
class CAboutDlg : public CDialog _;e\:7<m
{ D,rZ0?R
public: g%\L&}Jd
CAboutDlg(); qm(1:iK,0
// Dialog Data 1^{`lK~2
//{{AFX_DATA(CAboutDlg) ._<ii 2K'
enum { IDD = IDD_ABOUTBOX }; JSW&rn
//}}AFX_DATA <NB41/
// ClassWizard generated virtual function overrides 'b[0ci:
//{{AFX_VIRTUAL(CAboutDlg) Vxh.<b6&'
protected: [Ox(.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Lko`F$5X
//}}AFX_VIRTUAL 'sU)|W(3U
// Implementation &" h]y?Q
protected: "mZ.V
//{{AFX_MSG(CAboutDlg) ?R6`qe_F
//}}AFX_MSG )=H{5&e#u
DECLARE_MESSAGE_MAP() S,vu]?-8
}; kRot7-7I|
+d39f-[
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E
$6ejGw-
{ F?4Sz#
//{{AFX_DATA_INIT(CAboutDlg) ;^-:b(E
//}}AFX_DATA_INIT [7\>"v6
} e4.&aIC[
6
=gp:I
void CAboutDlg::DoDataExchange(CDataExchange* pDX) . U/k<v<)6
{ a%K}j\M
CDialog::DoDataExchange(pDX); )HVcG0H1
//{{AFX_DATA_MAP(CAboutDlg) Tsz
NlRxc
//}}AFX_DATA_MAP jA`a/vWu
} pm]fQuq
@"8R3BN
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;<-7*}Dj
//{{AFX_MSG_MAP(CAboutDlg) rn" pKUd
// No message handlers E`AYee%l
//}}AFX_MSG_MAP 3N<&u
END_MESSAGE_MAP() Qpu3(`d<
+qkMQETV6
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) mJMq{6;
: CDialog(CCaptureDlg::IDD, pParent) -JTG?JOd]
{ #IX&9 aFB}
//{{AFX_DATA_INIT(CCaptureDlg) MUcNC\`z
m_bControl = FALSE; 7rIlTrG
m_bAlt = FALSE; (cs~@
m_bShift = FALSE; K`4GU[ul
m_Path = _T("c:\\"); X8CVY0<o
m_Number = _T("0 picture captured."); *K)0UKBr
nCount=0; 4e9E'
"8%
bRegistered=FALSE; bUvK
bTray=FALSE; l)8sw=
//}}AFX_DATA_INIT 7/>a:02
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 knSuzq%*
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =kFuJ
x)f
} _T]>/}}p
Q]\j>>
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4v qNule
{ WK;(P4Z
CDialog::DoDataExchange(pDX); ZvH{wt
//{{AFX_DATA_MAP(CCaptureDlg) Kbas-</Si
DDX_Control(pDX, IDC_KEY, m_Key); "DjU:*'
DDX_Check(pDX, IDC_CONTROL, m_bControl); J
Jy{@[m
DDX_Check(pDX, IDC_ALT, m_bAlt); 8p=>?wG
DDX_Check(pDX, IDC_SHIFT, m_bShift); n\= (S9
DDX_Text(pDX, IDC_PATH, m_Path); 4VFc|g
DDX_Text(pDX, IDC_NUMBER, m_Number); OCW+?B;
//}}AFX_DATA_MAP Qp!J:YV
} o}~3JBnT
yWHne~!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) X47O l
//{{AFX_MSG_MAP(CCaptureDlg) 3w'W~
ON_WM_SYSCOMMAND() Jz$>k$!UD
ON_WM_PAINT() Yu3_=:
<C
ON_WM_QUERYDRAGICON() i<iXHBs
ON_BN_CLICKED(ID_ABOUT, OnAbout) <SQ(~xYi
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) QS\
x{<e/
ON_BN_CLICKED(ID_CHANGE, OnChange) }m_t$aaUc1
//}}AFX_MSG_MAP @^CG[:|
END_MESSAGE_MAP() {!=2<-Aq
;3UvkN
BOOL CCaptureDlg::OnInitDialog() 3; y_mg
{ E@pFTvo
CDialog::OnInitDialog(); F=i!d,S
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NI\H
\#bJ
ASSERT(IDM_ABOUTBOX < 0xF000); h{/ve`F>@
CMenu* pSysMenu = GetSystemMenu(FALSE); x,1=D~L}
if (pSysMenu != NULL) A&l7d0Z^j5
{ \n0gTwiO%
CString strAboutMenu; B01^oYM}
strAboutMenu.LoadString(IDS_ABOUTBOX); d_T<5Hin
if (!strAboutMenu.IsEmpty()) e?<D F.Md+
{ B] i:)
pSysMenu->AppendMenu(MF_SEPARATOR); M(5D'4.
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /{we;Ut=g
} Z| L2oce
} FpdHnu i1
SetIcon(m_hIcon, TRUE); // Set big icon }vD;DSz:
SetIcon(m_hIcon, FALSE); // Set small icon GP]TnQ<*;
m_Key.SetCurSel(0); o+^Eu}[.
RegisterHotkey(); vYzVY\
CMenu* pMenu=GetSystemMenu(FALSE); `M rBav
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); gj;@?o0
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wOcg4HlW
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )E`+BH
return TRUE; // return TRUE unless you set the focus to a control oKiD8':
} q?iCc c
!4B_$6US
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) o2}N=|&
{ sR!+d:LJ4
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Tc_do"uU
{ 6ZksqdP8
CAboutDlg dlgAbout; :#SNpn=@
dlgAbout.DoModal(); A^g>fv
} hVZo"XUb
else JUU&Z[6J
{ ;]@exp5
CDialog::OnSysCommand(nID, lParam); V{$Sfmey
} N 8}lt
} d h?dO`
6n-r
void CCaptureDlg::OnPaint() p1^0{ILx
{ 4W-"|Z_x
if (IsIconic()) !x_t`78T
{ I>Y{>S
CPaintDC dc(this); // device context for painting I61%H9;
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r=0j7^B#
// Center icon in client rectangle ,D8&q?a
int cxIcon = GetSystemMetrics(SM_CXICON); GLcd9|H
int cyIcon = GetSystemMetrics(SM_CYICON); ~me\
CRect rect; e>!E=J)j
GetClientRect(&rect); kjX7- ZPY
int x = (rect.Width() - cxIcon + 1) / 2; b[0S=e
G
int y = (rect.Height() - cyIcon + 1) / 2; zn^ v!:[
// Draw the icon O+vcs4
dc.DrawIcon(x, y, m_hIcon); OQc{
V
} {? 2;0}3?;
else d<v~=
{ sMX$Q45e
CDialog::OnPaint(); en%B>]QI
} J7m`]!*t
} ?\M)WDO
mR,O0O}&
HCURSOR CCaptureDlg::OnQueryDragIcon() .FJj
{ k-vA#
return (HCURSOR) m_hIcon; B{99gwMe]
} 6Ty3e|do
@E(P9zQ/zy
void CCaptureDlg::OnCancel() D&f!( n
{ WP!il(Gr
if(bTray) F-tFet
DeleteIcon(); dm 2EH
CDialog::OnCancel(); 9.]kOs_
} `fMpV8vv
_G[6+g5|
void CCaptureDlg::OnAbout() `~h0?g
{ ;L$,gn5H
CAboutDlg dlg; #@q1Ko!NZ
dlg.DoModal(); <K,[sy&Qy
} l{QC}{Ejc2
SlN" (nq
void CCaptureDlg::OnBrowse() ,@479ZvvR3
{ T,Fm"U6[(
CString str; vgN@~Xa
BROWSEINFO bi; fOLnK
y#
char name[MAX_PATH]; W
W35&mI)k
ZeroMemory(&bi,sizeof(BROWSEINFO)); F#KF6)P
bi.hwndOwner=GetSafeHwnd(); [brkx3h
bi.pszDisplayName=name; UT~4Cfb
bi.lpszTitle="Select folder"; `xGT_0&ck
bi.ulFlags=BIF_RETURNONLYFSDIRS; @Rf^P(
LPITEMIDLIST idl=SHBrowseForFolder(&bi); tbS#^Y
if(idl==NULL) nAvs~J
return; Yu;9&b
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));
.=CH!{j
str.ReleaseBuffer(); :^5>wDu{
m_Path=str; b(1:w"wD
if(str.GetAt(str.GetLength()-1)!='\\') d96fjj~
m_Path+="\\"; $-e=tWkgv
UpdateData(FALSE); ~9bv Wd1D
} 2=O))^8
{F/q{c~]
void CCaptureDlg::SaveBmp() E;$$+rA
{ ]y}Zi/zh
CDC dc; :k\}Ik
dc.CreateDC("DISPLAY",NULL,NULL,NULL); <oQ6 Z X
CBitmap bm; !x6IV25
int Width=GetSystemMetrics(SM_CXSCREEN); Wy!uRzbBv
int Height=GetSystemMetrics(SM_CYSCREEN); 03C .Xh=!
bm.CreateCompatibleBitmap(&dc,Width,Height); Z"]xdOre
CDC tdc; $q^O%(
tdc.CreateCompatibleDC(&dc); sN=KR qe
CBitmap*pOld=tdc.SelectObject(&bm); vv!Bo~L1,
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4NJVW+:2
tdc.SelectObject(pOld); ePi
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BITMAP btm; PH[4y:^DN
bm.GetBitmap(&btm); Agz=8=S%
DWORD size=btm.bmWidthBytes*btm.bmHeight; PQ i
}Evxa
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5e)i!;7Uv
BITMAPINFOHEADER bih; =8@RKG`>;
bih.biBitCount=btm.bmBitsPixel; qA04Vc[2
bih.biClrImportant=0; ss*5.(y
bih.biClrUsed=0; y1nP F&_
bih.biCompression=0; _E&U?>g+
bih.biHeight=btm.bmHeight; y&h~Oa?,;
bih.biPlanes=1; VYHOk3
bih.biSize=sizeof(BITMAPINFOHEADER); ZrA
Um
bih.biSizeImage=size; 8z?$t-D O
bih.biWidth=btm.bmWidth; mcCB7<.
e
bih.biXPelsPerMeter=0; w gmWo8
bih.biYPelsPerMeter=0; yX`J7O{=
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); eXc[3ceUr
static int filecount=0; 5R)[Ou.
CString name; RZ<.\N
(M
name.Format("pict%04d.bmp",filecount++); ":nI_~q
name=m_Path+name; =?^-P{:\?
BITMAPFILEHEADER bfh; ,Io0ZE>`V
bfh.bfReserved1=bfh.bfReserved2=0; NWeV>;lh9
bfh.bfType=((WORD)('M'<< 8)|'B'); 5%'o%`?i
bfh.bfSize=54+size; Nz}|%.GP"
bfh.bfOffBits=54; w{~" ;[@
CFile bf; 1R*1BStc
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ QP'qG@j[:
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 9OH.&g
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `..EQBM
bf.WriteHuge(lpData,size); z_'dRw
bf.Close(); \G]K,TG
nCount++; bKTqX[ =
} S io1Q0
GlobalFreePtr(lpData); ykJ+%gla
if(nCount==1) g^qz&;R]
m_Number.Format("%d picture captured.",nCount); .iN-4"_j1
else vs*>onCf
m_Number.Format("%d pictures captured.",nCount); r}Ltv?4
UpdateData(FALSE);
nMLU-C!t
} `Yg7,{A\J
\MF3CK@/
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) JATS6-Lz`
{ .V7Y2!4TE
if(pMsg -> message == WM_KEYDOWN) Q=^ktKMeR
{ 9fCiLlI
if(pMsg -> wParam == VK_ESCAPE) ZBPd(;"x+
return TRUE; LAj}kW~
if(pMsg -> wParam == VK_RETURN) Oib[\O7[z
return TRUE; |{zHM2 3gD
} 5aa}FdUq
return CDialog::PreTranslateMessage(pMsg); K3j_C`Se
} C3]\$
}klE0<W|5\
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N `J:^,H
{ L00Sp#$\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2*N&q|ED
SaveBmp(); ys:1Z\$P
return FALSE; 4F}g(
} -/@|2!d
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MX"A@p~H
CMenu pop; %g!yccD9
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9Ilfv
CMenu*pMenu=pop.GetSubMenu(0); =PI^X\if88
pMenu->SetDefaultItem(ID_EXITICON); >hHJ:5y
CPoint pt; 3| GNi~
GetCursorPos(&pt); ,w,ENU0~f
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^qE<yn
if(id==ID_EXITICON) #(m`2Z`H
DeleteIcon(); [Od>NO,n+]
else if(id==ID_EXIT) vx({N?
OnCancel(); d4b 9rtM
return FALSE; #9URVq,
}
v(i1Z}*b
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MtMvpHk
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xC=
y^-
1
AddIcon(); Y{+zg9L*
return res; 7qCJ]%)b6
} !#}v:~[A
1EKcD^U,
void CCaptureDlg::AddIcon() aeN}hG
{ 9:bh3@r/
NOTIFYICONDATA data; nF|#@O`1
data.cbSize=sizeof(NOTIFYICONDATA); #j(q/
T{x
CString tip; tI/mE[W
tip.LoadString(IDS_ICONTIP); x.j Yip
data.hIcon=GetIcon(0); K0d-MC
data.hWnd=GetSafeHwnd(); s:-8 Z\,
strcpy(data.szTip,tip); <B|n<R<?
data.uCallbackMessage=IDM_SHELL; Z!q2F%02FO
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *+_fP |cv
data.uID=98; @2x0V]AI
Shell_NotifyIcon(NIM_ADD,&data); =NVZ$K OZ
ShowWindow(SW_HIDE); V+4k!
bTray=TRUE; }qgqb
} L8,H9T#e
eO|^Lu]+
void CCaptureDlg::DeleteIcon() jhjW*F<u
{ xiOv$.@q
NOTIFYICONDATA data; $Uv<LVd(
data.cbSize=sizeof(NOTIFYICONDATA); ]be0I)
data.hWnd=GetSafeHwnd(); @lb=-oR!~
data.uID=98; SX1Fyy6
w
Shell_NotifyIcon(NIM_DELETE,&data); N7RG5?
ShowWindow(SW_SHOW); &0;{lS[N:L
SetForegroundWindow(); .{'Uvn
ShowWindow(SW_SHOWNORMAL); Im0+`9Jw
bTray=FALSE; a'*5PaXU@/
} l<0[ K(
)A>U<n $h
void CCaptureDlg::OnChange() Zi[{\7a
{ ,H#qgnp
RegisterHotkey(); SK2J`*
} F^ %{
;
w@gl
BOOL CCaptureDlg::RegisterHotkey() `? 9]'
{ Z9;nC zHm
UpdateData(); V7KtbL#
UCHAR mask=0; ($[r>)TG
UCHAR key=0; #Tgz,e9
if(m_bControl) )7Ho n
mask|=4; "NXm\`8
if(m_bAlt) [9YlLL@
mask|=2; E :'
if(m_bShift) ,q'gG`M
N
mask|=1; B BApL{
key=Key_Table[m_Key.GetCurSel()]; hy!'Q>[`
if(bRegistered){ ]ut-wqb{p
DeleteHotkey(GetSafeHwnd(),cKey,cMask); i5>J
bRegistered=FALSE; E7Gi6w~\
} ulz\x2[Pf
cMask=mask; clR?< LO
cKey=key; aOAwezfYR
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5CRc]Q#@
return bRegistered; &<fRej]v
} !~w6"%2+7
KL:6P-3
四、小结 &}L36|A:
M'>D[5;N~
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。