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:
VN(*m(b
O#t[YP 一、实现方法
`HO]
kJpX s 0_*^cZ 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:
(> _Lb |rG)Q0H, #pragma data_seg("shareddata")
|>[qC O HHOOK hHook =NULL; //钩子句柄
&]GR*a UINT nHookCount =0; //挂接的程序数目
*X{7m]5 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
IsShAi static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
8};kNW^2m static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
KVr9kcs static int KeyCount =0;
Gz BPI'C static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
,k=8|=aF #pragma data_seg()
~#i2reG5 !tcz_% 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。
k5J18S dpK- DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
G.^)5!By QqRF?%7q"q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
cTS.yN({G cKey,UCHAR cMask)
\#WWJh"W {
: p)R,('g BOOL bAdded=FALSE;
ij!], for(int index=0;index<MAX_KEY;index++){
DA04llX~ if(hCallWnd[index]==0){
5!cp^[rGL hCallWnd[index]=hWnd;
Sc#3<nVg HotKey[index]=cKey;
@}:E{J#g HotKeyMask[index]=cMask;
?qi~8.<w bAdded=TRUE;
K~2sX>l KeyCount++;
j*[P\Cm break;
v+[S${ }
(z.n9lkfi }
ZNM9@;7 return bAdded;
|TP, }
^,mN-.W //删除热键
W G@3+R>{ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
M nZljB {
/H"fycZ BOOL bRemoved=FALSE;
)Tp"l"(G for(int index=0;index<MAX_KEY;index++){
F'sX ^/; if(hCallWnd[index]==hWnd){
]uMZvAjb if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Yh!=mW!OY hCallWnd[index]=NULL;
Shn=Q HotKey[index]=0;
B :S8{ HotKeyMask[index]=0;
de)4)EzUP bRemoved=TRUE;
c;Tp_e@ KeyCount--;
x,]x>Up break;
JN4gH4ez) }
e^3D`GA }
K;WQV, }
ok0ZI>=, return bRemoved;
|m6rF7Q }
]s\vc:cc? 0nL
#-`S Yj*T'<e DLL中的钩子函数如下:
~CbiKez ^<-)rzTI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%OB>FY:| {
6W{Nw< BOOL bProcessed=FALSE;
+Ugy=678Tr if(HC_ACTION==nCode)
>
Xh=P% {
jex\5 if((lParam&0xc0000000)==0xc0000000){// 有键松开
WW{_D switch(wParam)
'*65j {
O39 case VK_MENU:
s~2o<# MaskBits&=~ALTBIT;
7<*0fy5n n break;
_z8"r& case VK_CONTROL:
VFx[{Hy MaskBits&=~CTRLBIT;
[Z"Z5e` break;
/*{'p!? case VK_SHIFT:
|>.MH MaskBits&=~SHIFTBIT;
@'):rFr@F break;
3<"j/9;K' default: //judge the key and send message
@&`^#pok break;
OylUuYy~j }
yj#FO'UY for(int index=0;index<MAX_KEY;index++){
ZS4dW_*[ if(hCallWnd[index]==NULL)
)B"{B1( continue;
2uN3:_w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
DbLo{mFEIj {
bGL} nPo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
J`)/\9'&& bProcessed=TRUE;
+6$+]u] }
O8b#'f~ }
cW_wIy\]& }
i%.k{MY else if((lParam&0xc000ffff)==1){ //有键按下
bf+C=A)s0 switch(wParam)
aJf3rHX {
u"(NN9s case VK_MENU:
n44 T4q MaskBits|=ALTBIT;
EyVu-4L:# break;
m BFNg3_ case VK_CONTROL:
kP+,x H)1 MaskBits|=CTRLBIT;
/;+\6(+X break;
fdX|t"oz case VK_SHIFT:
e)B1)c 8s MaskBits|=SHIFTBIT;
F~fBr break;
T9&{s-3* default: //judge the key and send message
}T(=tfv@ break;
~!~i_L\V }
u&uFXOc' for(int index=0;index<MAX_KEY;index++){
&g&,~Y/z; if(hCallWnd[index]==NULL)
JygJ4RI%j continue;
{l!{b1KJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
j0~am,yZ {
jT$J~MpHh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6xtgnl#T bProcessed=TRUE;
uA[
: }
TP {\V>*Yz }
CEkUXsp }
RV_I&HD! if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
2(0%{*m for(int index=0;index<MAX_KEY;index++){
1E
/G+pm if(hCallWnd[index]==NULL)
qpjZ-[UC continue;
Um\HX6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
.=Oww SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
A03io8D6 //lParam的意义可看MSDN中WM_KEYDOWN部分
GvG8s6IZ }
Vm\zLWNB }
ukEJ D3i }
;lb return CallNextHookEx( hHook, nCode, wParam, lParam );
PNo:[9`S;m }
=E]tEi $;G<!]& s 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
He'VqUw_ 5NUaXQ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
O2ktqAWx@ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
N,rd= m+ J-'XT_k:iM 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
J/K~8sc Q"u2< LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
(|Gwg \r {
EK=0oy[ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
(?8i^T?WP= {
ru2M"]T //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
EC8Z. Uu SaveBmp();
8)?&eE' return FALSE;
n0co*
]X+k }
x$` lQ% …… //其它处理及默认处理
$Z]@N
nA9N }
!`H{jwH /"st
sF jQm~F`z 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
>Rt:8uurAG }=R0AKz!Cv 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
:{)uD
; fXWE4^jU 二、编程步骤
)'f=!'X {
"Cu)AFy 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
I*Dj@f` .6$=]hdAp 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
G\MeJSt* //|B?4kk 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;
mxF+Fp~ )@I] Rk? 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;
[<U=)!Swg <";1[A%7< 5、 添加代码,编译运行程序。
YYFS
({ CSoVB[vS 三、程序代码
@OT$* Qh #tHYCSr] ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Io JI|lP #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
OET/4(C #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
5EQ)pH+ #if _MSC_VER > 1000
dl8f]y#Q #pragma once
6?%$e$s #endif // _MSC_VER > 1000
HLqN=vE6 #ifndef __AFXWIN_H__
Uaux0W #error include 'stdafx.h' before including this file for PCH
zE1=P/N #endif
h>*3i# #include "resource.h" // main symbols
ga\s5
class CHookApp : public CWinApp
|pBFmm* {
R'tvF$3=i public:
Tim/7*vx CHookApp();
l3^'b p6HQ // Overrides
Ig?9"{9p // ClassWizard generated virtual function overrides
rp<~=X //{{AFX_VIRTUAL(CHookApp)
-a>CF^tH public:
q9{ h@y virtual BOOL InitInstance();
r*mSnPz\q virtual int ExitInstance();
&E0^Jz //}}AFX_VIRTUAL
<5j%!6zo //{{AFX_MSG(CHookApp)
4@\$k+v // NOTE - the ClassWizard will add and remove member functions here.
&g90q // DO NOT EDIT what you see in these blocks of generated code !
XY6Sm{ //}}AFX_MSG
"AXgT[ O DECLARE_MESSAGE_MAP()
<>$CYTb };
Z-4/xi7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
zBq&/? BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
G?LC!9MB BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
( 1 BOOL InitHotkey();
x%H,ta% BOOL UnInit();
0/|Ax-dK #endif
PWp=}f.y )sK53O$ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
1'p=yHw #include "stdafx.h"
PU%f`) #include "hook.h"
EQpF:@_ #include <windowsx.h>
\v=@' #ifdef _DEBUG
`S4*~Xx #define new DEBUG_NEW
~;]zEq-hG #undef THIS_FILE
f>Ua 7!b static char THIS_FILE[] = __FILE__;
YZ:C9:S6X #endif
pQc-}o" #define MAX_KEY 100
pZ*%zt]-a #define CTRLBIT 0x04
-~(d_ #define ALTBIT 0x02
"WtYqXyd #define SHIFTBIT 0x01
T+RC#&> #pragma data_seg("shareddata")
[r Nd7-j < HHOOK hHook =NULL;
t~4Cf]) UINT nHookCount =0;
-'D~nd${ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
T4}Wg=UKg static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
* Wp?0CP static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
\I}EWI static int KeyCount =0;
^ZS!1%1 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{fV$\^c #pragma data_seg()
0k5 uqGLXe HINSTANCE hins;
k$f2i,7' void VerifyWindow();
(dyY@={q BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
F(lJ //{{AFX_MSG_MAP(CHookApp)
9I<~t@q5e@ // NOTE - the ClassWizard will add and remove mapping macros here.
}!Pty25j // DO NOT EDIT what you see in these blocks of generated code!
umnQ$y
0 //}}AFX_MSG_MAP
=w`uZ;l$Q END_MESSAGE_MAP()
w 2U302TZ Gl|n }wo$ CHookApp::CHookApp()
B6Ajcfy {
\k"Ct zoX // TODO: add construction code here,
A*/8j\{n // Place all significant initialization in InitInstance
LxWd_B }
XHJ`C\xR YIgHLM( CHookApp theApp;
\ %MsG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[YODyf}M>\ {
:O&jm.2m BOOL bProcessed=FALSE;
T2rBH]5 if(HC_ACTION==nCode)
iV#A-9 {
Y}2Sr-@u if((lParam&0xc0000000)==0xc0000000){// Key up
/|H9Gm switch(wParam)
7mXXMm {
zAklS 7L case VK_MENU:
z'1%%.r;FM MaskBits&=~ALTBIT;
%*Mr ^= break;
:IJ<Mmb case VK_CONTROL:
U~?mW,iRL MaskBits&=~CTRLBIT;
0&Ftx%6% break;
@b., pwZF case VK_SHIFT:
f9kdO& MaskBits&=~SHIFTBIT;
@Y.r ,q break;
]&D=*:c default: //judge the key and send message
UmGKj9u break;
/)K;XtcN }
`T1bY9O. for(int index=0;index<MAX_KEY;index++){
=v<A&4 if(hCallWnd[index]==NULL)
2.MUQ;OX continue;
x6!Q''f7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<,/7:n {
_
gYj@
% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Q/4ICgo4 bProcessed=TRUE;
LdNpb;* }
m||9,z- }
>35w"a7S }
ZPb30M0 else if((lParam&0xc000ffff)==1){ //Key down
-gba&B+D" switch(wParam)
&s?uMWR {
cVxO\M case VK_MENU:
$Q'z9ghEg MaskBits|=ALTBIT;
v_/<f&r break;
k_1@?&3 case VK_CONTROL:
mF+8Q MaskBits|=CTRLBIT;
!V/\_P!I break;
Nz`v+sp case VK_SHIFT:
r[;d.3jtP MaskBits|=SHIFTBIT;
#<eD break;
yx4pQL7 default: //judge the key and send message
qS!N\p~> break;
Pz:,de~5Qm }
9Sd?,z for(int index=0;index<MAX_KEY;index++)
G![4K#~NM {
~a`xI if(hCallWnd[index]==NULL)
CX\XaM)l continue;
=l*xM/S if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
VzHrKI {
H6jt[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
x
lqP% bProcessed=TRUE;
o'(BL:8s }
6g"h}p\{S }
['pO=ho }
0hGmOUO if(!bProcessed){
UXpp1/d|e for(int index=0;index<MAX_KEY;index++){
0wV9Trp if(hCallWnd[index]==NULL)
u
"k<
N|.3 continue;
oxL<\4)WJ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
dc1Zh
W4 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
g<0K
i^# }
J!5b~8`v }
.7b%7dQ<\ }
`Z5dRLrd return CallNextHookEx( hHook, nCode, wParam, lParam );
mR
XRuK }
x`@`y7( $)o0{HsL+ BOOL InitHotkey()
Mz2TwU_ {
.RFH@'' if(hHook!=NULL){
>8OY6wb nHookCount++;
5.&)hmpg return TRUE;
vGh>1U: }
2/s42
FoG else
Jkbeh. hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
'plUs<A if(hHook!=NULL)
Jx}-Y*
o nHookCount++;
zixG}' return (hHook!=NULL);
FG{les+: }
@d 7V@F0d BOOL UnInit()
mS![J69( {
*kqC^2t if(nHookCount>1){
t? 6 et1~ nHookCount--;
>jIn&s!} return TRUE;
=IQ}Y_xr }
BYM6cp+S BOOL unhooked = UnhookWindowsHookEx(hHook);
{9V.l.Q if(unhooked==TRUE){
kVKAG\F nHookCount=0;
_]4p51r0 hHook=NULL;
pl1CPxSdO }
dr=Q9% return unhooked;
>&S}u\/ }
<YU4RZ y||RK`H BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_Q
I!UQdW {
*.|%uf. BOOL bAdded=FALSE;
EUcD[Rv for(int index=0;index<MAX_KEY;index++){
BPt? 3tC if(hCallWnd[index]==0){
1Pw1TO"Z
hCallWnd[index]=hWnd;
VlA]A,P}i HotKey[index]=cKey;
;zD4#7= HotKeyMask[index]=cMask;
}a~hd*-# bAdded=TRUE;
'gs P9 KeyCount++;
SKnYeT break;
23L>)Q }
]T]{VB }
6Nn+7z<*&z return bAdded;
8t*sp-cy| }
At=d//5FFP H#;*kc
a4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
GK'p$`oJm {
LPJ7V`!k BOOL bRemoved=FALSE;
b=:u d[h for(int index=0;index<MAX_KEY;index++){
04;s@\yX4 if(hCallWnd[index]==hWnd){
=NC??e { if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
*4`5&) ` hCallWnd[index]=NULL;
AK&>3D HotKey[index]=0;
|w{Qwf!2 HotKeyMask[index]=0;
MAFdJ+n# bRemoved=TRUE;
T
pF[-fO KeyCount--;
a6DR' BC break;
xLoQ0rt
6 }
X7L:cVBg }
[I4MK%YQ }
~d]v{<3 return bRemoved;
T&]-p:mg^ }
|JYb4J4Ni LiT%d void VerifyWindow()
A2M(
ad {
=#W:z.w for(int i=0;i<MAX_KEY;i++){
b}0h()v if(hCallWnd
!=NULL){ 9_:"`)]3B
if(!IsWindow(hCallWnd)){ r@zT!.sc!
hCallWnd=NULL; MukJ^h*V
HotKey=0; a,RCK~GR
HotKeyMask=0; %hYgG;22
KeyCount--; '_.qhsS
} pz['o
} eP>_CrJb
} >;c);|'}q
} [q[37;ZEQ
H"AL@=
BOOL CHookApp::InitInstance() ")uKDq
{ 9!Mh(KtQ
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (=7"zECq#
hins=AfxGetInstanceHandle(); j%nN*ms
InitHotkey(); BM /FOY;
return CWinApp::InitInstance(); 8Zsaq1S
} <5z!0m-G
CipDeqau2
int CHookApp::ExitInstance() t7F0[E'=5\
{ +X^GS^mz
VerifyWindow(); \Yr*x7!
UnInit(); d%'#-w'
return CWinApp::ExitInstance(); B0Wf$
s^7t
} v~L\[&|_
FJ~d&L\l
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /y-D_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nahq O|~
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ AtCT
#if _MSC_VER > 1000 `3T=z{HR9g
#pragma once }UW*[dCf>C
#endif // _MSC_VER > 1000 3i!a\N4 K
Gr2}N"X=
class CCaptureDlg : public CDialog %BkE %ZcZ
{ uKk#V6t#
// Construction 'D5J5+.z
public: :zKW[sF
BOOL bTray; 1}=D
BOOL bRegistered; apa&'%7
BOOL RegisterHotkey(); :Pdh##k
UCHAR cKey; JL87a^ro
UCHAR cMask; WkA47+DsV
void DeleteIcon(); (t@)`N{
void AddIcon(); wz:e\ !
UINT nCount; d5gwc5X
void SaveBmp(); NzQvciJ@"
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [y`Gp#
// Dialog Data EZB0qZIp
//{{AFX_DATA(CCaptureDlg) ~&)\8@2
enum { IDD = IDD_CAPTURE_DIALOG }; Opu*i
CComboBox m_Key; M,H8ZO:R
BOOL m_bControl; *P*~CHx>
BOOL m_bAlt; :[n~(~7?
BOOL m_bShift; ,nteIR'??
CString m_Path; u?72]?SM
CString m_Number; /r~2KZE
//}}AFX_DATA <p b
// ClassWizard generated virtual function overrides _D4qnb@
//{{AFX_VIRTUAL(CCaptureDlg) pE<a:2J
public: .2@T|WD!Ah
virtual BOOL PreTranslateMessage(MSG* pMsg); 49*f=gpGj2
protected: JE9v+a{7
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZNw|5u^N
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); t^":.}[Q
//}}AFX_VIRTUAL D|ze0A@
// Implementation o!UB x<4
protected: /(s |'"6
HICON m_hIcon; j13-?fQ&
// Generated message map functions IwnDG;+Ap
//{{AFX_MSG(CCaptureDlg) S,:!H@~B
virtual BOOL OnInitDialog(); 1w7tRw
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }kmAUaa,Z
afx_msg void OnPaint(); cF15Mm2
afx_msg HCURSOR OnQueryDragIcon(); I*a@_EO
virtual void OnCancel(); p+=zl`\=|
afx_msg void OnAbout(); k(H]ILL
afx_msg void OnBrowse(); md{nHX&
afx_msg void OnChange(); K@1gK<,a
//}}AFX_MSG ?pEPwc
DECLARE_MESSAGE_MAP() e5bXgmyil
}; g]&fyB#
#endif -M=BD-_.h
xFp$JN
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file zy$jTqDH
#include "stdafx.h" m=9b/Nr4
#include "Capture.h" RM_%u=jC
#include "CaptureDlg.h" 9)tb=
#include <windowsx.h> _\+]/rY9o
#pragma comment(lib,"hook.lib") UiV#w#&P
#ifdef _DEBUG KU$,{Sn6@
#define new DEBUG_NEW J8Wits]A]$
#undef THIS_FILE QY)p![6Fj
static char THIS_FILE[] = __FILE__; Nxe1^F33
#endif PzKTEYJL
#define IDM_SHELL WM_USER+1 u|IS7>Sm
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Cty{
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *Ze0V9$'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )KFxtM-
class CAboutDlg : public CDialog tjThQ
{ V6dq8Z"h
public: y$7Ys:R~
CAboutDlg(); %_s)Gw&sq
// Dialog Data <MG&3L.[
//{{AFX_DATA(CAboutDlg) kNWTM%u9
enum { IDD = IDD_ABOUTBOX }; 'M6+(`x
//}}AFX_DATA bI0xI[#Q
// ClassWizard generated virtual function overrides }F{s\qUt
//{{AFX_VIRTUAL(CAboutDlg) Ox J0."
protected: m@kLZimD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "W+>?u )
//}}AFX_VIRTUAL `$jun
// Implementation vE(]!CB
protected: hev;M)t
//{{AFX_MSG(CAboutDlg) CJN~p]\
//}}AFX_MSG bh5D}w
DECLARE_MESSAGE_MAP() =|AYT6z,
}; }d}sC\>U
9oc_*V0<
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) If'2
m_
{ L3\#ufytb
//{{AFX_DATA_INIT(CAboutDlg) \l(J6Tu
//}}AFX_DATA_INIT 8zeeC
eI U
} >6Uc|D
L,A+"
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -'qVnu
{ BJ5MCb.w
CDialog::DoDataExchange(pDX); $`GlXiV
//{{AFX_DATA_MAP(CAboutDlg) *CXc{{
//}}AFX_DATA_MAP LGuZp?"
} }h Wv
p
$Z)u04;&@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +r"}@8/\1
//{{AFX_MSG_MAP(CAboutDlg) b|.Cqsb
// No message handlers 2R,}
j@
//}}AFX_MSG_MAP ,!Q nh:
END_MESSAGE_MAP() R4 eu,,J
U:8]G
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e
bpt/q[
: CDialog(CCaptureDlg::IDD, pParent) oQ-m
{ "[7-1} l
//{{AFX_DATA_INIT(CCaptureDlg) mmJnE
m_bControl = FALSE; dz+!yE\f$
m_bAlt = FALSE; RdD>&D$I
m_bShift = FALSE; `,SL\\%u
m_Path = _T("c:\\"); ~.3v\Q
m_Number = _T("0 picture captured."); RN 4?]8
nCount=0; *_I`{9~'
bRegistered=FALSE; |Io:D:
bTray=FALSE; U)f('zD
//}}AFX_DATA_INIT bu6Sp3g
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #b*4v&<
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jC[_uG
} Q(-&}cY
8>WA5:]v
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5QK%BiDlr
{ J/P[9m30[
CDialog::DoDataExchange(pDX); +pG+ xI
//{{AFX_DATA_MAP(CCaptureDlg)
t[+bZUS$~
DDX_Control(pDX, IDC_KEY, m_Key); "9'3mmZm=?
DDX_Check(pDX, IDC_CONTROL, m_bControl); N{bg-%s10i
DDX_Check(pDX, IDC_ALT, m_bAlt); db,?b>,EE
DDX_Check(pDX, IDC_SHIFT, m_bShift); 8<}=f4vUj5
DDX_Text(pDX, IDC_PATH, m_Path); AJ6l#j-
DDX_Text(pDX, IDC_NUMBER, m_Number); Kw"e4 a
//}}AFX_DATA_MAP rzHBop-8
} N9|J\;fzT
.?s jr4
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) o@gceZuk
//{{AFX_MSG_MAP(CCaptureDlg) Tk[]l7R~
ON_WM_SYSCOMMAND() (bv{17K
ON_WM_PAINT() :@jctH~
ON_WM_QUERYDRAGICON() %ZD]qaU0
ON_BN_CLICKED(ID_ABOUT, OnAbout) W7A!QS
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ox#vW6;)
ON_BN_CLICKED(ID_CHANGE, OnChange) G7CkP
//}}AFX_MSG_MAP U&6A)SW,k
END_MESSAGE_MAP() (${:5W
,Tar?&C:
BOOL CCaptureDlg::OnInitDialog() k^|z.$+
{ ]@Y!,bw&
CDialog::OnInitDialog(); IrZ\;!NK
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &4evh<z
ASSERT(IDM_ABOUTBOX < 0xF000); >3D1:0Sg
CMenu* pSysMenu = GetSystemMenu(FALSE); Vx.c`/
if (pSysMenu != NULL) I)1ih
{ Mj1f;$
CString strAboutMenu; :(ql=+vDb4
strAboutMenu.LoadString(IDS_ABOUTBOX); D$4GNeB+#
if (!strAboutMenu.IsEmpty()) 'z,kxra|n
{ "{~FEx4
pSysMenu->AppendMenu(MF_SEPARATOR); ]cP%d-x}
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zAM9%W2v_
} *w0|`[P+h
} *(5;5r
SetIcon(m_hIcon, TRUE); // Set big icon @!oN]0`F;
SetIcon(m_hIcon, FALSE); // Set small icon V
H`_
m_Key.SetCurSel(0); I,#E`)
RegisterHotkey(); i[9gcL"
CMenu* pMenu=GetSystemMenu(FALSE); )t+pwh!8
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `lE&:)
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); I~F&@
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `AE6s.p?
return TRUE; // return TRUE unless you set the focus to a control \^,Jh|T
} >;Oa|G
sE&nEc
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #2i$:c~
{ \EU3i;BNT%
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Y>aVnixx<
{ U/{t" e
CAboutDlg dlgAbout; sryA(V
dlgAbout.DoModal(); |DW^bv
} BMO,eQcB
else jt}oq%Bf
{ @1'OuX^
CDialog::OnSysCommand(nID, lParam); Z?xaXFm_
} \?v&JmEU
} qspGNu
X\!q8KEpR&
void CCaptureDlg::OnPaint() MF.!D;s
{ IWi0? V
if (IsIconic()) Hk+44
{ ^k%+ao
CPaintDC dc(this); // device context for painting l
opl
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); KO8vUR*2R
// Center icon in client rectangle 2m*ugBO;
int cxIcon = GetSystemMetrics(SM_CXICON); p'^}J$
int cyIcon = GetSystemMetrics(SM_CYICON); yB7si(,1>
CRect rect; =%I[o=6
GetClientRect(&rect); U%r{{Q1
int x = (rect.Width() - cxIcon + 1) / 2; 2X' H^t]7
int y = (rect.Height() - cyIcon + 1) / 2; )MI w/
// Draw the icon HLz<C
dc.DrawIcon(x, y, m_hIcon); /Z*$k{qIR&
} L|APX y]>
else r)>'cjx/
{ SE(<(w
CDialog::OnPaint(); *IbDA
} Y<POdbg
} z5({A2q
hoBFC1
HCURSOR CCaptureDlg::OnQueryDragIcon() l+6@,TY1U
{ 4J,6cOuW4
return (HCURSOR) m_hIcon; Mfz(%F|<
} o7+<sL
bS:$VyH6
void CCaptureDlg::OnCancel() GB `n
{ } -4p8Zt
if(bTray) z|AknEE,
DeleteIcon(); &/uakkS
CDialog::OnCancel(); "Vc|D (g
} bZWR.</
YdvXp/P:|
void CCaptureDlg::OnAbout() X)]>E]X
{ !V #*(_+n
CAboutDlg dlg; zQ<&[Tuwa
dlg.DoModal(); @.cord`
} 7>7n|N
IA1O]i
S
void CCaptureDlg::OnBrowse() *tZ3?X[b
{ |U1u:=[
CString str; 5C*Zb3VG4
BROWSEINFO bi; p({|=+bl
char name[MAX_PATH]; NY?iuWa*g
ZeroMemory(&bi,sizeof(BROWSEINFO)); /Tl ybSC1
bi.hwndOwner=GetSafeHwnd(); P/~dY[6m
bi.pszDisplayName=name; 5r8
["
bi.lpszTitle="Select folder"; G2[2y-Rv
bi.ulFlags=BIF_RETURNONLYFSDIRS; 0j;|IU\
LPITEMIDLIST idl=SHBrowseForFolder(&bi); HWoMzp5="3
if(idl==NULL) &flcJ`
return; ~O./A-l
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M[b~5L+S
str.ReleaseBuffer(); 1: cq\Y
m_Path=str; Y
uZ
if(str.GetAt(str.GetLength()-1)!='\\') S WsD]rn
m_Path+="\\"; gDfM} 2]/
UpdateData(FALSE); ,9=P=JH
} =fBr2%qK
,t1s#*j\!q
void CCaptureDlg::SaveBmp() 3S^Qo9S
{ YA8/TFu<_
CDC dc; Tz&cm=
dc.CreateDC("DISPLAY",NULL,NULL,NULL); BI#(L={5
CBitmap bm; xop\W4s_
int Width=GetSystemMetrics(SM_CXSCREEN); `,GFiTPd
int Height=GetSystemMetrics(SM_CYSCREEN); K24y;968
bm.CreateCompatibleBitmap(&dc,Width,Height); Q4ii25]*
CDC tdc; IP !zg|c,
tdc.CreateCompatibleDC(&dc); IMSm
CBitmap*pOld=tdc.SelectObject(&bm); t?uw^nV 3E
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &U.y):
tdc.SelectObject(pOld); H-5f!>)
BITMAP btm; Rx%kAt2X
bm.GetBitmap(&btm); TKw>eGe
DWORD size=btm.bmWidthBytes*btm.bmHeight; nYRD>S?uz
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <N80MUL|
BITMAPINFOHEADER bih; g5Hsz,x
bih.biBitCount=btm.bmBitsPixel; `~=Is.V[
bih.biClrImportant=0; ^kB9
I8u
bih.biClrUsed=0; 0Z%<H\Z
bih.biCompression=0; 9D%~~~
%b
bih.biHeight=btm.bmHeight; Q"xDRQA
bih.biPlanes=1; jTQN(a9Y
bih.biSize=sizeof(BITMAPINFOHEADER); *OE>gg&?Nh
bih.biSizeImage=size; ~ C_2D?
bih.biWidth=btm.bmWidth; g=v[@{9Pw
bih.biXPelsPerMeter=0; E\}Q9,Z$
bih.biYPelsPerMeter=0; kr1^`>O5
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5o(=?dXm4
static int filecount=0; p|*b] 36
CString name; @qJv
name.Format("pict%04d.bmp",filecount++); d<;XQ.Wo7
name=m_Path+name; iN`L* h
BITMAPFILEHEADER bfh; @D<Q'7mLh
bfh.bfReserved1=bfh.bfReserved2=0; ~b4fk^u`+
bfh.bfType=((WORD)('M'<< 8)|'B'); }>j1j^c1='
bfh.bfSize=54+size; ?~Vev D
bfh.bfOffBits=54; T5U(B3j_
CFile bf; H
@E-=Ly
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }% |GV
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R?%|RCht1
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0Zl1(;hx@
bf.WriteHuge(lpData,size); i%B$p0U<
bf.Close(); \@n/L{}(@
nCount++; |@)ij c4i
} bL7mlh
GlobalFreePtr(lpData); !C0=
h
if(nCount==1) b}q,cm
m_Number.Format("%d picture captured.",nCount); ]zK} X!
else aR;Q^YJ+a
m_Number.Format("%d pictures captured.",nCount); ?at~il$z'
UpdateData(FALSE); PsD]gN5"
} sAc)X!}
X]CaWxM
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d}415 XA
{ *JOv
if(pMsg -> message == WM_KEYDOWN) q`;URkjk
{ N=L
urXv
if(pMsg -> wParam == VK_ESCAPE) 7~`6~qg.
return TRUE;
ae1fCw3k
if(pMsg -> wParam == VK_RETURN) ]R]X#jm
return TRUE; ')FNudsC
} PwNLJj+%
return CDialog::PreTranslateMessage(pMsg); q+G1#5
} vqxTf)ys
n#]G!7
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -)<Nd:A
{ /ci.IT$Q^
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g-(xuR^*
SaveBmp(); G6Fg<g9:
return FALSE; 86} rz
} ;j_#,Da9<
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %F/tbXy{
CMenu pop; 'Ph;:EMj
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )I}G:bBa
CMenu*pMenu=pop.GetSubMenu(0); If#7SF)n'
pMenu->SetDefaultItem(ID_EXITICON); I2l'y8)d
CPoint pt; *'t`;m~
GetCursorPos(&pt); }&naP
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KJkcmF}Q
if(id==ID_EXITICON) @',;/j80
DeleteIcon(); da^9Fb
else if(id==ID_EXIT) ta4<d)nB
OnCancel(); <*5D0q#~"
return FALSE; 3 \WdA$Wx
} >)
:d38M
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bo"I:)n;
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Tp6ysjao
AddIcon(); },L[bDOV07
return res; f!Ie
} r#~6FpFVK^
`4p9K
void CCaptureDlg::AddIcon() BzUx@,
{ lJ,s}l7
NOTIFYICONDATA data; |O+binq
data.cbSize=sizeof(NOTIFYICONDATA); \%^3Izsc
CString tip; LOYv%9$0*p
tip.LoadString(IDS_ICONTIP); / q!&I
data.hIcon=GetIcon(0); @<sP1`1
data.hWnd=GetSafeHwnd(); Z,&ywMm/G
strcpy(data.szTip,tip); t-Fl"@s
data.uCallbackMessage=IDM_SHELL; ,?f(~<Aj
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sR0nY8@F
data.uID=98; WL~`L!_. A
Shell_NotifyIcon(NIM_ADD,&data); K=>/(sWiq
ShowWindow(SW_HIDE); U5PCj ]-Xt
bTray=TRUE; 8UZEC-K
} Te/)[I'Tn
%qv7;E2C
void CCaptureDlg::DeleteIcon() zc(7p;w#p
{ xMh&C{q
NOTIFYICONDATA data; S9BJjo
data.cbSize=sizeof(NOTIFYICONDATA); 0nuFWV
data.hWnd=GetSafeHwnd(); A,/S/_Q=
data.uID=98; P$QfcJq&c*
Shell_NotifyIcon(NIM_DELETE,&data); 3WVHI$A9
ShowWindow(SW_SHOW); $_UF9l0
SetForegroundWindow(); Q&LkST-i
ShowWindow(SW_SHOWNORMAL); EkBM>*W
bTray=FALSE; mnia>;
0H
} J{ Vl2P?@
#75;%a8
void CCaptureDlg::OnChange() \#}%E h
b
{ ),Rj@52l
RegisterHotkey(); &_6:TqJ
} f<'C<xnf
3QVng^"B)
BOOL CCaptureDlg::RegisterHotkey() 6bn-NY:i
{ $p@g#3X`
UpdateData(); {Q"<q`c
UCHAR mask=0; tpD?-`9o
UCHAR key=0; StVv"YY
if(m_bControl) b6(yyYdF
mask|=4; BkF[nL*|
if(m_bAlt) G~Sfpf
mask|=2; -wt2ydzos
if(m_bShift) b,W'0gl
mask|=1; wtKh8^:YD
key=Key_Table[m_Key.GetCurSel()]; @wPmx*SF
if(bRegistered){ V_QVLW
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^s*} 0
bRegistered=FALSE; )wRD
} {1+H\(v
cMask=mask; FRW.
cKey=key; 2^aTW`>L
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >seB["C
return bRegistered; BSY#xe V
} m @%|Q;
wMoAvA_oS
四、小结 @!da1jN
+9J>'oe'D
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。