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:
A1'IK.
Sr+1.77} 一、实现方法
A,=l9hE'
54^hBejQ 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:
,~4(td+R7 dO8Z {wfs #pragma data_seg("shareddata")
Xif`gb6` HHOOK hHook =NULL; //钩子句柄
"R30oA#m UINT nHookCount =0; //挂接的程序数目
O-'T*M> static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
A|a\pL` @ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
3=K-+dhk|t static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Ys3C'Gc static int KeyCount =0;
G:&Q)_ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
l{pF^?K #pragma data_seg()
Z$hxo)| U)l>#gf8 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
/KV@Ce\ dkn_`j\v DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
d*AV(g#B :iWV:0)P BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
hOC,Eo cKey,UCHAR cMask)
vcSS+ {
TX+t
BOOL bAdded=FALSE;
#UI`G3w< for(int index=0;index<MAX_KEY;index++){
}}xR?+4A if(hCallWnd[index]==0){
-OW$ hCallWnd[index]=hWnd;
~,guw7F HotKey[index]=cKey;
"yz@LV1 HotKeyMask[index]=cMask;
9q5[W=| bAdded=TRUE;
.s9Iymz KeyCount++;
$fn^i. break;
4C[gW }
d)AkA\neWo }
;s!H return bAdded;
0y1t%C075 }
s`TBz8QO$ //删除热键
hg&AQk BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rLXn35O {
g!QumRF BOOL bRemoved=FALSE;
aOuon0 for(int index=0;index<MAX_KEY;index++){
>L(F{c: if(hCallWnd[index]==hWnd){
VuR BJ2D if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}9kq? hCallWnd[index]=NULL;
97g-*K HotKey[index]=0;
ejQCMG7 HotKeyMask[index]=0;
=0-qBodbl bRemoved=TRUE;
H9Z3.F(2 KeyCount--;
E:tUbWVp break;
^49moC- }
8]L.E }
Lr~K3nb }
?t"PawBWE return bRemoved;
3HiW1*5W }
x?F{=\z/o p?h;Sv/ INT2i8oU DLL中的钩子函数如下:
I"!{HnSG` :({<"H)!' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
4CCux4)N {
0k>&MkM\^ BOOL bProcessed=FALSE;
!K2[S
J if(HC_ACTION==nCode)
W
| }Hl{} {
&sWyh[`P if((lParam&0xc0000000)==0xc0000000){// 有键松开
PLyu1{1"z switch(wParam)
loB/w{r*x {
WI9.?(5q case VK_MENU:
,jWd?-NH MaskBits&=~ALTBIT;
X>4`{x ` break;
9..k/cH case VK_CONTROL:
Rju8%FRO MaskBits&=~CTRLBIT;
Z8@]e}n break;
u0e#iX case VK_SHIFT:
|{nI.> MaskBits&=~SHIFTBIT;
LKZI@i) break;
5zGj,y>u default: //judge the key and send message
aVb]H0 break;
*l^'v9
}
525 >=h for(int index=0;index<MAX_KEY;index++){
pSP_cYa#(# if(hCallWnd[index]==NULL)
KWUz]>Z continue;
)X/Faje if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*X #e {
^m=%Ctu# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
P(;c` bProcessed=TRUE;
,W-0qN&%/ }
X3nhqQTZ }
g2]-Q. }
O /&%`&2 else if((lParam&0xc000ffff)==1){ //有键按下
$5IrM7i switch(wParam)
QhUraZ {
75HL case VK_MENU:
.g~@e_;): MaskBits|=ALTBIT;
a\w|tf break;
\2,18E case VK_CONTROL:
-(.7/G'Vk> MaskBits|=CTRLBIT;
57>ne)51 break;
_ XZ=4s case VK_SHIFT:
8hfh,v5( MaskBits|=SHIFTBIT;
!;gke,fB break;
WdAGZUp default: //judge the key and send message
SS~Q ;9o break;
$%JyM }
bAiw]xi for(int index=0;index<MAX_KEY;index++){
O m if(hCallWnd[index]==NULL)
q9!9OcN2 continue;
l/^-:RRNKi if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A&F4;>dms {
Y
zS*p~| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
H~i],WD bProcessed=TRUE;
5m42Bqy" }
p'qH [<s }
G{.+D2 }
x*/S*!vx\ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
8Ac:_Zg for(int index=0;index<MAX_KEY;index++){
sM9+dh if(hCallWnd[index]==NULL)
^`G}gWBx}w continue;
@9"J|} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
y:6; LZ9[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_8E/)M //lParam的意义可看MSDN中WM_KEYDOWN部分
&%-73nYw }
N ,z6y5Lu }
>vA2A1WhW }
G.UI|r/Kz return CallNextHookEx( hHook, nCode, wParam, lParam );
gg8Uo G }
ghRVso( F>rH^F 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
Ng_!zrx04 )Eo)t> BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
rvw)-=qR[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`*shF9.\C :ijAqfX 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
"
W|%~h ~sXcnxLz LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
D"D<+
;S# {
JeE;V![ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ej"+:."\e {
GN2Sn`; //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
lg&t8FHa; SaveBmp();
&c,kQo+pA return FALSE;
VzVc37Z>6 }
,KFapz! …… //其它处理及默认处理
gdQvp=v] }
zO iu5 1Yn
+<I S.f5v8 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Pjc
Tx + .qZI$
l. 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。
f=9|b qXwPDq/ 二、编程步骤
&mx)~J^m Dg?:/=,=9r 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";
v'3J.?N ?pd8w#O 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
:\o {_ VF ys.= 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;
H7DJ~z~J mVpMh#zw 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;
PGoh1Uu J
G{3EWXR 5、 添加代码,编译运行程序。
Kh_Lp$'0uM 2_Z ? #Y 三、程序代码
M"94#.dKK v
p/yG ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
U3dwI:cG #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
K>@+m #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
A nX%[W " #if _MSC_VER > 1000
e\:+uVzz #pragma once
FFEfI4&SfS #endif // _MSC_VER > 1000
W*I(f]8:y` #ifndef __AFXWIN_H__
m+T;O/lG0{ #error include 'stdafx.h' before including this file for PCH
e-EUf #endif
D1=((`v
' #include "resource.h" // main symbols
mUikA9u5= class CHookApp : public CWinApp
%Da1(bBh {
WL"^>[Vq public:
jr:7?8cH0L CHookApp();
_y}
T/I9 // Overrides
bl&nhI)w // ClassWizard generated virtual function overrides
P&^;656r //{{AFX_VIRTUAL(CHookApp)
wLnf@&jQ% public:
yL-YzF2 virtual BOOL InitInstance();
G\+L~t virtual int ExitInstance();
y#z //}}AFX_VIRTUAL
QvKh,rBFVG //{{AFX_MSG(CHookApp)
7V!*NBsl // NOTE - the ClassWizard will add and remove member functions here.
)u`[6,d // DO NOT EDIT what you see in these blocks of generated code !
`M^=
D&Bf //}}AFX_MSG
.E8_Oz DECLARE_MESSAGE_MAP()
z?*w8kU&> };
N@Uy=?)ZJ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
?b>,9A.Z BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
IHv[v*4: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
9^#c|
0T BOOL InitHotkey();
Evg_q> BOOL UnInit();
Eu@huN*/ #endif
Oagsoik %_%Q8,W //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
#W.#Hjpp #include "stdafx.h"
2Tp1n8FV #include "hook.h"
M:[ %[+6 #include <windowsx.h>
_)>_{Pm #ifdef _DEBUG
naR0@Q"\h #define new DEBUG_NEW
IS &ZqE(`e #undef THIS_FILE
NUWDc]@J* static char THIS_FILE[] = __FILE__;
=k^Y?. #endif
po2! #define MAX_KEY 100
%D%8^Zd_ #define CTRLBIT 0x04
a C\MJ9 #define ALTBIT 0x02
OX?\<), #define SHIFTBIT 0x01
ij( B,Y #pragma data_seg("shareddata")
TU,s*D&e HHOOK hHook =NULL;
m!tbkZHQn0 UINT nHookCount =0;
m4hg'<<V static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
7>))D'l57 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
b)qoh^ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ch|jtVeuyJ static int KeyCount =0;
f$Fhf?' static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
R5-@ #pragma data_seg()
P"IPcT%Ob% HINSTANCE hins;
%u5L!W& void VerifyWindow();
CFMo)" BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
RbP6F*f //{{AFX_MSG_MAP(CHookApp)
Rnr(g;2 // NOTE - the ClassWizard will add and remove mapping macros here.
Q/(K$6]j // DO NOT EDIT what you see in these blocks of generated code!
lvBx\e;7P //}}AFX_MSG_MAP
koZ*+VP= END_MESSAGE_MAP()
1VG4S){}\9 Uyg5i[&X@ CHookApp::CHookApp()
aJbO((%$|u {
= C8 ?M // TODO: add construction code here,
}J:U=HJ // Place all significant initialization in InitInstance
:~tAUy":_* }
_u5#v0Y $0>60<J CHookApp theApp;
:toh0oB[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
K}buH\yco {
T?tgdJ BOOL bProcessed=FALSE;
yW1)vD7 if(HC_ACTION==nCode)
7XTkX"zKj {
8hOk{xs8 if((lParam&0xc0000000)==0xc0000000){// Key up
NV72 switch(wParam)
!sQY&* {
ZojIR\F^ case VK_MENU:
v1+3}5b'uF MaskBits&=~ALTBIT;
mD$A4Y-'p break;
>~[c|ffyo/ case VK_CONTROL:
H8Bs<2 MaskBits&=~CTRLBIT;
:t8b39 break;
@"Fme-~ case VK_SHIFT:
j,lT>/ MaskBits&=~SHIFTBIT;
%et }A93 break;
.oYl-.E>& default: //judge the key and send message
Sq/
qu-%X break;
=jOv] / }
c[wla<dO* for(int index=0;index<MAX_KEY;index++){
Rg\z<wPBG if(hCallWnd[index]==NULL)
fk6%XO continue;
A+ZK4]xb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)wam8k5 {
&:9cAIe]H SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*'.|9W bProcessed=TRUE;
`scR*]f1+ }
#~}nFY. }
zZPuha8 }
e6R}0w~G else if((lParam&0xc000ffff)==1){ //Key down
_~IR6dKE switch(wParam)
"7'J&^| {
R_W+Ylob case VK_MENU:
n'wU;!W9 MaskBits|=ALTBIT;
=n5zM._S- break;
8_BV:o9kL case VK_CONTROL:
p{amC ;cI$ MaskBits|=CTRLBIT;
=9'RM>
break;
9YIM'q>`v case VK_SHIFT:
8uc1iB MaskBits|=SHIFTBIT;
+Mo9kC break;
ov`h default: //judge the key and send message
tZ:_ag)o break;
^ =bu(L }
:mh_G for(int index=0;index<MAX_KEY;index++)
a
oD`=I*< {
z1PBMSG if(hCallWnd[index]==NULL)
-LK
B$ continue;
q0i(i.h if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8Wrh]egu1 {
!;&p"E|b# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(6?9B lH~ bProcessed=TRUE;
q>_/u" }
.zA^)qgL }
kO.%9wFbz }
=x%dNf$e{W if(!bProcessed){
fxgPhnaC> for(int index=0;index<MAX_KEY;index++){
4ni<E* if(hCallWnd[index]==NULL)
#C~+JL continue;
rq8K_zp if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
jSD#X3qp SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
aktU$Wbwl }
q@QksAq }
Y_;#UU689 }
5,3'=mA6 return CallNextHookEx( hHook, nCode, wParam, lParam );
hm84Aq= f }
tX9{hC^ 6]V4muz#c BOOL InitHotkey()
bU>U14ix< {
*g:4e3Iy if(hHook!=NULL){
wa<MRt W= nHookCount++;
I
WTwz!+ return TRUE;
/[a~3^Gs^ }
q.KG^=10 else
-[*,^Ti` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
SN9kFFIPb= if(hHook!=NULL)
m'Amli@[ nHookCount++;
3EV;LH L return (hHook!=NULL);
k$R~R-' }
CY
4gSe? BOOL UnInit()
R@58*c:U( {
y6ECdVF if(nHookCount>1){
7,U=Qe; nHookCount--;
h;C5hU4P return TRUE;
L"E7#} }
1Ce@*XBU BOOL unhooked = UnhookWindowsHookEx(hHook);
yQ_B)b if(unhooked==TRUE){
r54&XE]O nHookCount=0;
!POl;%\ hHook=NULL;
9A/\h3HrJ }
Hbj,[$Jb return unhooked;
#X%~B' }
l7XUXbYp&= 03|PYk 6EW BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\l'm[jy> {
eV2W{vuI BOOL bAdded=FALSE;
#+:9T/*>0 for(int index=0;index<MAX_KEY;index++){
8;d:-Cp if(hCallWnd[index]==0){
W3]_m8,Z hCallWnd[index]=hWnd;
8qk?E6 HotKey[index]=cKey;
.GsV>H HotKeyMask[index]=cMask;
m;H.#^b* bAdded=TRUE;
c&r70L, KeyCount++;
8>trS=;n break;
(n*^4@"2 }
> A Khf }
$Z!`Hb return bAdded;
~qcNEl\-y }
NaPt"G
;9[fonk BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
<L mIK {
O}+.U<V
BOOL bRemoved=FALSE;
) brVduB for(int index=0;index<MAX_KEY;index++){
p31NIf` if(hCallWnd[index]==hWnd){
>sfRI]OG if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
whmdcVh. hCallWnd[index]=NULL;
Vr )<\h HotKey[index]=0;
gwOa$f%O HotKeyMask[index]=0;
d:ARf bRemoved=TRUE;
O-ew%@_ KeyCount--;
H2&@shOOQJ break;
LM$W* }
M}`B{]lLz }
98j>1"8 }
~T ]m>A! return bRemoved;
88VZR&v }
$}<PL}+ =@m &s^R void VerifyWindow()
{v=T [D {
udxFz2>_l$ for(int i=0;i<MAX_KEY;i++){
J5di[nu if(hCallWnd
!=NULL){ gi(H]|=a
if(!IsWindow(hCallWnd)){ NgADKrDU
hCallWnd=NULL; $LKIT0
HotKey=0; }O/U;4Z
HotKeyMask=0; $Wjww-mx
KeyCount--; W,4QzcQR
} '= _/ 1F*q
} NiWa7 /Hr
} ;'?l$
._
} kjW+QT?T&
ZO!I.
BOOL CHookApp::InitInstance() Qt iDTr
{ <A[E:*`*
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~"!]
3C,L
hins=AfxGetInstanceHandle(); AuUde$l_
InitHotkey(); Y,GU%[+
return CWinApp::InitInstance(); ks3`3q 7
} TMAJb+@l:
" W!M[qBW
int CHookApp::ExitInstance() Fw/6?:C}O6
{ C+?Hm1
VerifyWindow(); 1LqoF{S:
UnInit(); 6o
|kIBte-
return CWinApp::ExitInstance(); {G|,\O1
} [DJ flCR&
c|lu&}BS
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?Y)vGlWDW<
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tkVbo.[8K
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ pA`+hQNN
#if _MSC_VER > 1000 nA?`BOe(
#pragma once hhSy0
#endif // _MSC_VER > 1000 XUM!Qv
VcAue!MN
class CCaptureDlg : public CDialog G %N
$C
{ stG~AC
// Construction 8;z6=.4xtg
public: IYqBQnX}oM
BOOL bTray; @En^wN
BOOL bRegistered; g3Ec"_>P
BOOL RegisterHotkey(); ln$&``L
UCHAR cKey; e8y;.D[2
UCHAR cMask; t2EHrji~
void DeleteIcon(); -mC0+}h
void AddIcon(); IN4=YrM^
UINT nCount; s4G|_==
void SaveBmp(); A:>01ZJ5S+
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~1cnE:x;V
// Dialog Data $@sEn4h
//{{AFX_DATA(CCaptureDlg) bsuus
R9W
enum { IDD = IDD_CAPTURE_DIALOG }; So{x]x:f
CComboBox m_Key; 'Hc-~l>D
BOOL m_bControl; [r3 !\HI7x
BOOL m_bAlt; D5$wTI
BOOL m_bShift; Q<z_/j9
CString m_Path; ,%n\=
CString m_Number; #?5 (o
//}}AFX_DATA 8
![|F:
// ClassWizard generated virtual function overrides ,O.3&Nz,c
//{{AFX_VIRTUAL(CCaptureDlg) CJ(NgYC h
public: 0FGe=$vD
virtual BOOL PreTranslateMessage(MSG* pMsg); Uh.oErHQD
protected: y@ ML/9X8q
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ykv94i?Q
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `o<'
x.I
//}}AFX_VIRTUAL |B.0TdF
// Implementation )_1zRT| 9
protected: =2Bg9!zW>
HICON m_hIcon; JQ}$Aqk
// Generated message map functions dODt(J}%
//{{AFX_MSG(CCaptureDlg) #@^t;)|
virtual BOOL OnInitDialog(); Q&MZN);.
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g$(
V^
afx_msg void OnPaint(); qi;f^9M%
afx_msg HCURSOR OnQueryDragIcon(); OH;b"]
virtual void OnCancel();
D0g ZC
afx_msg void OnAbout(); ~}F{vm
afx_msg void OnBrowse(); =Qh\D
afx_msg void OnChange(); RD\
//}}AFX_MSG km)zMoE{c{
DECLARE_MESSAGE_MAP() zfI>qJ+Nqt
}; 8'~[pMn`
#endif UjaK&K+M?
Dpvk\t
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file < XP9@t&
#include "stdafx.h" ' pm2n0
#include "Capture.h" m6n?bEl6I
#include "CaptureDlg.h" wm]^3qI2
#include <windowsx.h> &Ts-a$Z7?S
#pragma comment(lib,"hook.lib") FQT~pfY
#ifdef _DEBUG dA@'b5N{"
#define new DEBUG_NEW Xg<*@4RD8
#undef THIS_FILE SeHagKA
static char THIS_FILE[] = __FILE__; 9l}FU$
#endif ZaeqOVp/j
#define IDM_SHELL WM_USER+1 *_R]*o!W'
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [E+$?a=
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HHiT]S9
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; W- i&sUgy
class CAboutDlg : public CDialog RMd[Yr2e
{ ?dD&p8{
public: h]og*(
CAboutDlg(); XS`M-{f`
// Dialog Data s >e=?W
//{{AFX_DATA(CAboutDlg) Wi[ ~fI8^!
enum { IDD = IDD_ABOUTBOX }; "J+3w
//}}AFX_DATA ~2<7ZtV=
// ClassWizard generated virtual function overrides '6Ay&A3N]
//{{AFX_VIRTUAL(CAboutDlg) CF+_/s#j^
protected: 350_CN,
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u`y><w4i
//}}AFX_VIRTUAL J\d3N7_d
// Implementation %FXfqF9
protected: )ap_Z6
//{{AFX_MSG(CAboutDlg) +
` s@
//}}AFX_MSG #?q&r_@@
DECLARE_MESSAGE_MAP() j;s"q]"x]
}; 8#(Q_
V+Cwzc^j
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /DQc&.jK
{ M%1}/!J3
//{{AFX_DATA_INIT(CAboutDlg) Q>/C*@
//}}AFX_DATA_INIT A/s>PhxV
} M7+nW ; e%
AK\$i$@6
void CAboutDlg::DoDataExchange(CDataExchange* pDX) +|bmT
{ YGv<VOWG2
CDialog::DoDataExchange(pDX); Yu?95qk tP
//{{AFX_DATA_MAP(CAboutDlg) <,3^|$c%
//}}AFX_DATA_MAP Swp;HW7x
} |AcRIq
fRy^Q_~,
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -:30:oq
//{{AFX_MSG_MAP(CAboutDlg) SV:4GVf
// No message handlers HHq_P/'
//}}AFX_MSG_MAP G2t;DN(
END_MESSAGE_MAP() *NkA8PC
'rMN=1:iu"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) M&NB/
: CDialog(CCaptureDlg::IDD, pParent) <@}I0
{ f8M$45A'
//{{AFX_DATA_INIT(CCaptureDlg) zunV<2~(2}
m_bControl = FALSE; vk*=4}:
m_bAlt = FALSE; v-yde>(
m_bShift = FALSE; }e2(T
m_Path = _T("c:\\"); 58%#DX34M
m_Number = _T("0 picture captured."); S:TgFt0
nCount=0; e*@{%S
bRegistered=FALSE; A-,up{g
bTray=FALSE; ##@$|6
//}}AFX_DATA_INIT k$H%.l;E
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '~ ,p[
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ][W_[0v
} K?s+ 3
FDVcow*] n
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) l5\"9 ,<
{ UNPezHaz
CDialog::DoDataExchange(pDX); 2zVJ vn7
//{{AFX_DATA_MAP(CCaptureDlg) 1AG=%F|.
DDX_Control(pDX, IDC_KEY, m_Key); L3G \
DDX_Check(pDX, IDC_CONTROL, m_bControl); M9y<t'
DDX_Check(pDX, IDC_ALT, m_bAlt); TUHi5K
DDX_Check(pDX, IDC_SHIFT, m_bShift); wD68tG$
DDX_Text(pDX, IDC_PATH, m_Path); \[gReaI
DDX_Text(pDX, IDC_NUMBER, m_Number); {?J/c{=/P
//}}AFX_DATA_MAP 3 n'V\Hvz
} L]d-hs
]Ar\c["
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r *$Ner
//{{AFX_MSG_MAP(CCaptureDlg) 8zA=;~GHP
ON_WM_SYSCOMMAND() ?;vgUO
ON_WM_PAINT() uL3Eq>~x
ON_WM_QUERYDRAGICON() " R-!(9k^`
ON_BN_CLICKED(ID_ABOUT, OnAbout) OiE;B
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]UH`Pdlt
ON_BN_CLICKED(ID_CHANGE, OnChange) Si_%Rr&jW
//}}AFX_MSG_MAP A5i :x$ww
END_MESSAGE_MAP() ~zSCg|"r
@+9<O0
BOOL CCaptureDlg::OnInitDialog() %^1cyk
{ ,WvY$_#xW%
CDialog::OnInitDialog(); <Q?a=4
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); oP!;\a( SL
ASSERT(IDM_ABOUTBOX < 0xF000); -O&CI)`;B
CMenu* pSysMenu = GetSystemMenu(FALSE); E2cB U{x
if (pSysMenu != NULL) oS7(s
{ Zs}5Smjl;%
CString strAboutMenu; SB5&A_tr
strAboutMenu.LoadString(IDS_ABOUTBOX); td4[[ /
if (!strAboutMenu.IsEmpty()) abJ"
[
{ AJSx%?h:6
pSysMenu->AppendMenu(MF_SEPARATOR); qTAc[Ko
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^|/](
} W?eu!wL#p
} } ~"hC3w
SetIcon(m_hIcon, TRUE); // Set big icon x_c7R;C
SetIcon(m_hIcon, FALSE); // Set small icon %I-+Ead0i
m_Key.SetCurSel(0); F
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RegisterHotkey(); ;Ra+=z}>
CMenu* pMenu=GetSystemMenu(FALSE); _R.B[\r@
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); G7)Fk%>
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); p=C%Hmd5E
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m;D- u>o
return TRUE; // return TRUE unless you set the focus to a control Wm);C~Le
} $KLD2BAL
-K
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void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Ea?XT&,
{
W -
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Mz1G5xcl
{ )ZBY* lk9
CAboutDlg dlgAbout; zGc:
@z
dlgAbout.DoModal(); !'j?.F$}
} K-f1{ 0
else `;l?12|X
{ .Wq@gV
CDialog::OnSysCommand(nID, lParam); TYlbU<
} I
j$lDJS
} ,_X/Gb6)
59zENUYl
void CCaptureDlg::OnPaint() zH>hx5,k'X
{ @#P,d5^G
if (IsIconic()) vjQb%/LWl
{ ?Q-h n:F)
CPaintDC dc(this); // device context for painting rQEyD
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5w\fSY
// Center icon in client rectangle 52b*[tZ
int cxIcon = GetSystemMetrics(SM_CXICON); NTS#sgP
int cyIcon = GetSystemMetrics(SM_CYICON); k6Uc3O
CRect rect; u~3%bJ]
GetClientRect(&rect); cZ(elZ0~
int x = (rect.Width() - cxIcon + 1) / 2; &f7fK|}
int y = (rect.Height() - cyIcon + 1) / 2; "dROb}szn
// Draw the icon {0;3W7
dc.DrawIcon(x, y, m_hIcon); iSFuT7;%
} m$9w"8R
else u5~Ns&o&N
{ xS7$%w['
CDialog::OnPaint(); h.!}3\Y
} =56T{N
} pSm $FBW h
% ,N<
HCURSOR CCaptureDlg::OnQueryDragIcon() 0<8XI>.3D
{ UjOB98Du
return (HCURSOR) m_hIcon; }?&k a$rI
} Y!WG)u5
,R$u?c0>'&
void CCaptureDlg::OnCancel() CH
fVQ|!\
{ :>aQ~1f>]
if(bTray) #-8\JEn
DeleteIcon(); MwfOy@|N
CDialog::OnCancel(); '{[5M!B
} w~#nYM=fP!
-tnQCwq#
void CCaptureDlg::OnAbout() BW"&6t#kA
{ N`E-+9L)
CAboutDlg dlg; 8/t$d#xHI
dlg.DoModal(); 1Nu1BLPm
} oW^*l#v
7},)]da>,'
void CCaptureDlg::OnBrowse() w=|GJ0
{ *=fr8
CString str; 2DB7+aZ*
BROWSEINFO bi; `+t.!tv!
char name[MAX_PATH]; l~D N1z6`
ZeroMemory(&bi,sizeof(BROWSEINFO)); >6oOZbUY0
bi.hwndOwner=GetSafeHwnd(); |A%<Z(
bi.pszDisplayName=name; I+ es8
bi.lpszTitle="Select folder"; xr7+$:>a
bi.ulFlags=BIF_RETURNONLYFSDIRS; <" @zn
LPITEMIDLIST idl=SHBrowseForFolder(&bi); vsL[*OeI
if(idl==NULL) ?88`fJ@tk?
return; 0<PR+Iv*i
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }<z_Q_b+e
str.ReleaseBuffer(); q %0Cg=
m_Path=str; hky;CD~$
if(str.GetAt(str.GetLength()-1)!='\\') S!PzLTc
m_Path+="\\"; +dBz`WD
UpdateData(FALSE); LTJc,3\,
} goJ|oi
saU]`w_Z*
void CCaptureDlg::SaveBmp() OEPa|rb
{ -k(CJ5H9
CDC dc; sz--27es
dc.CreateDC("DISPLAY",NULL,NULL,NULL); __[xD\ES
CBitmap bm; }Z
TGi,Pc
int Width=GetSystemMetrics(SM_CXSCREEN); Fkf97Oi
int Height=GetSystemMetrics(SM_CYSCREEN); }n7th
bm.CreateCompatibleBitmap(&dc,Width,Height); bu&t'?zx!
CDC tdc; aF|d^
tdc.CreateCompatibleDC(&dc); _/S?#
CBitmap*pOld=tdc.SelectObject(&bm); K^rIG6
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -dv%H{
tdc.SelectObject(pOld); AH4EtZC=W
BITMAP btm; -`f04_@>d
bm.GetBitmap(&btm); _U{([M>;
DWORD size=btm.bmWidthBytes*btm.bmHeight; #{9G sD
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |!q$_at
BITMAPINFOHEADER bih;
@HBEt^!
bih.biBitCount=btm.bmBitsPixel; +3i7D
bih.biClrImportant=0; 7O`o ovW$
bih.biClrUsed=0; BZb]SoAL
bih.biCompression=0; n,~;x@=5
bih.biHeight=btm.bmHeight; >xA),^ YT
bih.biPlanes=1; b dJ+@r
bih.biSize=sizeof(BITMAPINFOHEADER); tRw@U4=y
bih.biSizeImage=size; X%bFN
bih.biWidth=btm.bmWidth; 0t#g}
bih.biXPelsPerMeter=0; ]O{u tm
bih.biYPelsPerMeter=0; "+?Cz!i
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); fWF|,A>>b
static int filecount=0; * MM[u75
CString name; }X;U|]d
name.Format("pict%04d.bmp",filecount++); qn"D#K'&(
name=m_Path+name; `o79g"kxe
BITMAPFILEHEADER bfh; !:LJzROh
bfh.bfReserved1=bfh.bfReserved2=0; 4yaxl\2
bfh.bfType=((WORD)('M'<< 8)|'B'); T\VNqs@
bfh.bfSize=54+size; x90jw$\%7
bfh.bfOffBits=54; *?yJkJ"
CFile bf; 1! p/6
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ x'Pi5NRE
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); JaWv]@9*
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hJ5z/5aE;
bf.WriteHuge(lpData,size); 3`HnLD/
bf.Close(); w(1Gi$Z(Q)
nCount++; p.fF}B
} ED$DSz)x
GlobalFreePtr(lpData); ~#}Dx
:HH
if(nCount==1) <DH*~tLp2
m_Number.Format("%d picture captured.",nCount); D\^WXY5e%y
else xjdw'v+qZo
m_Number.Format("%d pictures captured.",nCount); G6K
<
UpdateData(FALSE); [oc~iDx%W
} <B /5J:o<
# x>g a
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Rq~t4sA:
{ gM>=%/.
if(pMsg -> message == WM_KEYDOWN) 4z:#I;
{ `ya;:$(6
if(pMsg -> wParam == VK_ESCAPE) 6@tvRDeaDW
return TRUE; ]WJfgN4
if(pMsg -> wParam == VK_RETURN) IfDx@ ?OB
return TRUE; 4c~>ci,N?(
} Bn]K+h\E
return CDialog::PreTranslateMessage(pMsg); 7:h!Wj-a]
} <-UOISyf
J
NC
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n,P5o_^:
{ iy\KzoB
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1 7hTr
SaveBmp(); \g-j9|0
return FALSE; ,`td@Y
} g"Qh]:
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5;)*T6Y
CMenu pop; %Hi~aRz
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); |!d"*.Q@F
CMenu*pMenu=pop.GetSubMenu(0); =A[5=
k>
pMenu->SetDefaultItem(ID_EXITICON); tPHS98y
CPoint pt; DE{h5-g
GetCursorPos(&pt); ZF#Rej?
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o%M<-l"!/
if(id==ID_EXITICON) Bk|K%K
DeleteIcon(); Jx-wO/
else if(id==ID_EXIT) WV kR56
OnCancel(); iO!6}yJ*V
return FALSE; ++[5q+b
} d]0a%Xh[
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W( *V2<$o
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Em13dem
AddIcon(); qH%")7>
return res; myQ&%M
gx
} IGj`_a
;n#%G^!H
void CCaptureDlg::AddIcon() Aj"7q
{ $%c{06Oq(
NOTIFYICONDATA data; ,<ya@Fi{
data.cbSize=sizeof(NOTIFYICONDATA); h.
hjz?
CString tip; E\2Ml@J
tip.LoadString(IDS_ICONTIP); 8{&["?
data.hIcon=GetIcon(0); Sn3:x5H,l
data.hWnd=GetSafeHwnd(); ^9"KTZc-*
strcpy(data.szTip,tip); #P2;K
dDO
data.uCallbackMessage=IDM_SHELL; 7CvD'QW /
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UWG+#,1J.\
data.uID=98; Kf7WcJ4b
Shell_NotifyIcon(NIM_ADD,&data); "Q+83adY4x
ShowWindow(SW_HIDE); 1H4fJ3-
bTray=TRUE; Q]JX`HgPaU
} &hZwZgV+3
B(HT.%r^A
void CCaptureDlg::DeleteIcon() p5]_}I`+2
{ BQgoVnQo_c
NOTIFYICONDATA data; oJ;rc{n-
data.cbSize=sizeof(NOTIFYICONDATA); 0.(<'!"y
data.hWnd=GetSafeHwnd(); Z/ bB
h
data.uID=98; x%BF{Sw
Shell_NotifyIcon(NIM_DELETE,&data); V+B71\x<
ShowWindow(SW_SHOW); KI&:9j+M)
SetForegroundWindow(); *FgJ|y6gk
ShowWindow(SW_SHOWNORMAL); CyM}Hc&w
bTray=FALSE; Ya4?{2h@+
}
7
Yv!N
mv
Ov<x;l
void CCaptureDlg::OnChange() ~I_owCVZ
{ 8<PKKDgbfd
RegisterHotkey(); E[Bo4?s&^
} zjM/M
P{oAObP%
BOOL CCaptureDlg::RegisterHotkey() ~a+NJ6e1
{ <O857j
UpdateData(); `6w#8}
UCHAR mask=0; FRyPeZR
UCHAR key=0; -Wo15O"
if(m_bControl) Y_H/3?b%
mask|=4; Ky9W/dCR
if(m_bAlt) F&@ |M(
mask|=2; ]A:( L9
if(m_bShift) K84&sSi
mask|=1; m/${8
key=Key_Table[m_Key.GetCurSel()]; 6}&^=^-
if(bRegistered){ f~\Xg7<
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6M><(1fT
bRegistered=FALSE; $-G`&oT
} 9&jPp4qG
cMask=mask; LdWc
X`K
cKey=key; >BiRk%x
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "n- pl
return bRegistered; >A jCl
} !EFBI+?&
n9}RW;N+u
四、小结 YF[$Q=7.
pC^[ [5A
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。