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:
H6eGLg={
]gW J, 一、实现方法
S7vE[VF5 one>vi`= 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:
GwULtRa/ -iHhpD9"X #pragma data_seg("shareddata")
:KLD~k7yA( HHOOK hHook =NULL; //钩子句柄
IY&a! UINT nHookCount =0; //挂接的程序数目
*GhRU5 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
BTyVfq
sx static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
`<n:D`{dZ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
[C6?:'}FA static int KeyCount =0;
\zUsHK?L"t static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
NC}#P<U #pragma data_seg()
){:aGGtko v(O.GhJ@ 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。
;=OH=+Rl =.c"&,c?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:
~e<<aTwN v2'JL(= BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Ln|${c cKey,UCHAR cMask)
"q.uiz+1: {
M=A9ax BOOL bAdded=FALSE;
%U7B0- for(int index=0;index<MAX_KEY;index++){
O~el2 if(hCallWnd[index]==0){
Q:\hh=^ hCallWnd[index]=hWnd;
bRK9Qt#3 HotKey[index]=cKey;
Tjqn::~D HotKeyMask[index]=cMask;
B .mV\W bAdded=TRUE;
M}Mzm2d#` KeyCount++;
*@nUas2" break;
?s]`G'=>V` }
`,Gk1~Wv }
[
UJj*n return bAdded;
8.':pY'8" }
C.-a:oQ[ //删除热键
MjTKM; BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Hi9z<l=$
{
h'p0V@!N BOOL bRemoved=FALSE;
;>9pJ72r for(int index=0;index<MAX_KEY;index++){
`%3p.~> if(hCallWnd[index]==hWnd){
ErC[Zh"'' if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
N3<Jh hCallWnd[index]=NULL;
E6k&r} HotKey[index]=0;
M'iKk[Hjfx HotKeyMask[index]=0;
~@a
R5Q>us bRemoved=TRUE;
+kL(lBv' KeyCount--;
dk/*%a
+ break;
<4,?lZ }
}o-P }
N sL"p2w~ }
uw!|G> return bRemoved;
df& |Lc1J }
W)cLMGet ;G]'}$`/q :\_MA^< DLL中的钩子函数如下:
=1\wZuK# .<%M8rcj LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
ud D[hPJd {
59J9V3na BOOL bProcessed=FALSE;
^E17_9? if(HC_ACTION==nCode)
,IE0+!I {
di2=P)3 if((lParam&0xc0000000)==0xc0000000){// 有键松开
/g''-yT7# switch(wParam)
dAl<'~g {
iGLYM- case VK_MENU:
{2r7:nvR MaskBits&=~ALTBIT;
P*Sip?tdE break;
|81N/]EER case VK_CONTROL:
6~WE#z_ MaskBits&=~CTRLBIT;
ycD.:w p\' break;
YCO:bBmp: case VK_SHIFT:
@98SC}}u MaskBits&=~SHIFTBIT;
%)Dd{|c break;
QL18MbfqP default: //judge the key and send message
T9-a
uK0d break;
yW?%c#9D }
T
l(uqY?9 for(int index=0;index<MAX_KEY;index++){
|9]K:A if(hCallWnd[index]==NULL)
Tpx,41(k continue;
#9VY[< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#/<Y!qV& {
4 GW[GT SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
, vyx`wDd bProcessed=TRUE;
%W;Gf9.w }
@(fY4]K }
ilpZ/Rs }
agT[y/gb else if((lParam&0xc000ffff)==1){ //有键按下
e~]e9-L>I switch(wParam)
"IJMvTmj {
MWh+h7k' case VK_MENU:
.fY<"2g MaskBits|=ALTBIT;
l>Ja[`X@ break;
^!_7L4&y case VK_CONTROL:
':)j@O3- MaskBits|=CTRLBIT;
5G;^OI!g break;
WV"QY/e3 case VK_SHIFT:
6D"`FPC MaskBits|=SHIFTBIT;
w]o5L break;
l zPS
RT default: //judge the key and send message
luk2fi<$ break;
[Vp2!" }
'xoE
[0! for(int index=0;index<MAX_KEY;index++){
@k6}4O?{ if(hCallWnd[index]==NULL)
sNmC#, continue;
p+UHJ& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<JM%Kn ) {
#'J7Wy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
C+m^Z[ bProcessed=TRUE;
)Q/`o,Vm }
EiP&Y,vT }
(A fbS=[ }
42wC."A if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
lv_% for(int index=0;index<MAX_KEY;index++){
edk9Qd9 if(hCallWnd[index]==NULL)
_XNR um4 continue;
PG[O?l if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{)9HS~e T SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
N<"6=z@w+ //lParam的意义可看MSDN中WM_KEYDOWN部分
RdvTtXg }
6ri?y=-c }
c&?a,fpb }
m3Z}eC8LK return CallNextHookEx( hHook, nCode, wParam, lParam );
r9a!,^}F }
&t|V:_?/x !XA%[u 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:
!2U7gVt"* as|c`4r\O BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
;6
6_G Sjz BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
}rA+W-7 Z6([/n 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:
wp*&&0O! :F
w"u4WI LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
7a]Zws {
.P:f if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
EJ;0ypbG {
!^bB/e //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
r2F SaveBmp();
3et2\wOX1x return FALSE;
V& j.>Y }
S]%U] …… //其它处理及默认处理
Dw/Gha/ }
;E? hz Vt)\[Tl~ 5OW8G][ 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。
b|8>eY *5_8\7d 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。
y_4krY|Zx #JR ,C
-w 二、编程步骤
g6/N\[b% vWi.[] 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";
Q @OC = vV\F^ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
lPcVhj6No% 5az
4N T 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
NuS|X
Kg TGxCH 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;
kl3S~gE4@ :UDn^(# 5、 添加代码,编译运行程序。
0B$7S,2 OQL09u 三、程序代码
b~Pxgfu" :Nj`_2 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
h;ol" #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
*v
nxP9< #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Sd<@X@iU8D #if _MSC_VER > 1000
Fx[A8G #pragma once
o=RqegL #endif // _MSC_VER > 1000
_`X#c-J #ifndef __AFXWIN_H__
YK?*7 #error include 'stdafx.h' before including this file for PCH
jPYe_y #endif
Bpm5dT; #include "resource.h" // main symbols
Xlqz8cI class CHookApp : public CWinApp
T^%n!t {
sAD P~xvU
public:
K)Xs L CHookApp();
Ij6Wz.* // Overrides
_]D#)-uv}C // ClassWizard generated virtual function overrides
;4/dk_~p] //{{AFX_VIRTUAL(CHookApp)
/@:up+$ public:
nc\C4g virtual BOOL InitInstance();
kF+ }.x% virtual int ExitInstance();
>xZhK63C/ //}}AFX_VIRTUAL
<`p75B //{{AFX_MSG(CHookApp)
APtselC // NOTE - the ClassWizard will add and remove member functions here.
2htA7V*dD // DO NOT EDIT what you see in these blocks of generated code !
!,6v=n[Nz //}}AFX_MSG
.KU SNrs' DECLARE_MESSAGE_MAP()
n:bB$Ai2 };
Zu0;/_rN LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
3b?OW7H BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l@tyg7CwY BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
MCi` TXr BOOL InitHotkey();
ZH;y>Z BOOL UnInit();
u$%D9Z ^ #endif
g",w kO| s*)41\V0 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
xf^<ec #include "stdafx.h"
)p!*c, #include "hook.h"
a:-)+sgHw #include <windowsx.h>
aZawBU.: #ifdef _DEBUG
7Js>!KR #define new DEBUG_NEW
e\A(#l@g #undef THIS_FILE
I>kiah* static char THIS_FILE[] = __FILE__;
hM36QOdm #endif
=##s;zj(% #define MAX_KEY 100
,h@R' f! #define CTRLBIT 0x04
mP)3cc5T #define ALTBIT 0x02
gP%|:" #define SHIFTBIT 0x01
znQ'm^ h #pragma data_seg("shareddata")
O+E1M=R6h HHOOK hHook =NULL;
S}m$,<x UINT nHookCount =0;
S[L#M;n static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
%CxEZPe$ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
sMz^!RX@ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
?}=-eJ(7e static int KeyCount =0;
&'huS?gA9 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
J~iOP #pragma data_seg()
$/, BJ/9 HINSTANCE hins;
Y[iDX# void VerifyWindow();
62MRI BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
@QVqpE<| //{{AFX_MSG_MAP(CHookApp)
oTF^<I-C // NOTE - the ClassWizard will add and remove mapping macros here.
?y>Y$-v/C // DO NOT EDIT what you see in these blocks of generated code!
@3-,=x //}}AFX_MSG_MAP
Y(hW(bd; END_MESSAGE_MAP()
l- 1]w$
y $*AC>i\ CHookApp::CHookApp()
ol$2sI=.s {
GJIWG&C03 // TODO: add construction code here,
>k&8el6h // Place all significant initialization in InitInstance
Q$|^~ }
|-(IJG#) jJ*@5?A CHookApp theApp;
a@fE46o6< LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
z29qARiX {
c7+Djqs BOOL bProcessed=FALSE;
aE7u5PM if(HC_ACTION==nCode)
Wa[x`:cT?u {
VDByj "% if((lParam&0xc0000000)==0xc0000000){// Key up
f=:3! k,S switch(wParam)
wovmy{K {
m/YH^N0 case VK_MENU:
>:F,-cx< MaskBits&=~ALTBIT;
VG<Hw{ c3r break;
@cuD8<\i case VK_CONTROL:
* MSBjH| MaskBits&=~CTRLBIT;
]g;^w?9h break;
p~Hvl3SxR case VK_SHIFT:
4AY
_#f5u MaskBits&=~SHIFTBIT;
*<*0".# break;
& Fg|%,fv] default: //judge the key and send message
>H0) ph break;
}O,U2=Hw`] }
xl+DRPzl for(int index=0;index<MAX_KEY;index++){
zH)cU%I@. if(hCallWnd[index]==NULL)
2PVx++*]C continue;
XYqpI/s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
XJx,9trH {
$nB-ADRu@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4GG1E. z} bProcessed=TRUE;
SXRdNPXFO }
<91t`&aWW }
zVM4BT( }
le7
`uz!% else if((lParam&0xc000ffff)==1){ //Key down
?xtt7*'D switch(wParam)
Sao>P[#x {
*:=];1O case VK_MENU:
[_y9"MMwn MaskBits|=ALTBIT;
}Vvsh3 break;
t6'61*)|0 case VK_CONTROL:
D9 qX->p MaskBits|=CTRLBIT;
! jbEm8bt break;
_Kc1 case VK_SHIFT:
)\{'fF MaskBits|=SHIFTBIT;
IK*oFo{C=K break;
nK+lE0 default: //judge the key and send message
HQq`pG%m6 break;
t*{,Gk }
j~M#Ss-H8 for(int index=0;index<MAX_KEY;index++)
OSp?okV {
\\=.6cg<K if(hCallWnd[index]==NULL)
6(>3P continue;
s~S?D{! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NTqo`VWe {
%x&F4U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
dCB&c^ bProcessed=TRUE;
JNh=fvO2i }
^C!mCTL1N }
[NYj.#,oR }
IE&_!ce if(!bProcessed){
No:^hY:F8 for(int index=0;index<MAX_KEY;index++){
3c c1EQ9 if(hCallWnd[index]==NULL)
f?,-j>[.=f continue;
!8.En8Z<D- if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
B{s]juPG SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
12 idM* }
'@'B>7C# }
:3JCvrq }
n
vm^k return CallNextHookEx( hHook, nCode, wParam, lParam );
mO#I nTO }
}l~]b3@qu %$Aqbd BOOL InitHotkey()
l`SK*Bm~< {
./$
<J6-J if(hHook!=NULL){
5^\m`gS nHookCount++;
$fj])>=H return TRUE;
I0!j<G }
&k1/Z*/ else
r)V Lf#3B hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]Z_$'?f if(hHook!=NULL)
l;Q
>b]DZ nHookCount++;
XJe/tR return (hHook!=NULL);
X]qCS0GD' }
GGH;Z WSe BOOL UnInit()
#C4|@7w% {
BsKbn@'uC if(nHookCount>1){
p~h4\.*` nHookCount--;
Hw Z^D=A return TRUE;
0z/h+, }
xJ-*%'(KZ BOOL unhooked = UnhookWindowsHookEx(hHook);
~%`EeJwT if(unhooked==TRUE){
|VK:2p^ u nHookCount=0;
|V lMmaz hHook=NULL;
8=:A/47=J }
'f 3HKn<L return unhooked;
\I;cZ>{u"} }
XTV0Le\f &`\ ep9 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;TtaH {
XJUEwX BOOL bAdded=FALSE;
0A.PD rM: for(int index=0;index<MAX_KEY;index++){
_ j~4+H if(hCallWnd[index]==0){
J==}QEhQ{ hCallWnd[index]=hWnd;
?FN9rhAC HotKey[index]=cKey;
j~epbl)pC HotKeyMask[index]=cMask;
0{Bf9cH bAdded=TRUE;
`4LJ;KC( KeyCount++;
`qE4U4 break;
J;~E<_"Hn }
N r<9u$d9= }
TFO74^ return bAdded;
i-b1d'?Rb }
CJp-Y}fGEA ZPlPN;J^1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/u=aX {
>5.zk1&H BOOL bRemoved=FALSE;
`$at9 for(int index=0;index<MAX_KEY;index++){
okz]Qc>G if(hCallWnd[index]==hWnd){
mf}\s]_c if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>PIPp7C hCallWnd[index]=NULL;
8
}-7{ HotKey[index]=0;
ABcBEv3 HotKeyMask[index]=0;
[m\,+lG?)j bRemoved=TRUE;
k{a)gFH
O KeyCount--;
k d+l k: break;
fWj@e"G }
X@!X6j }
G]-%AO{K }
7%4.b7Q return bRemoved;
45)D+ }
};rm3;~ eg 9\AS@SH{^T void VerifyWindow()
wlr Ign% {
7H%_sw5S. for(int i=0;i<MAX_KEY;i++){
]U[&uymax if(hCallWnd
!=NULL){ S6GMUaR
if(!IsWindow(hCallWnd)){ @ u+|=x];
hCallWnd=NULL; 8b7;\C~$p
HotKey=0; )!eEO [\d
HotKeyMask=0; &Pq\cNYzW
KeyCount--; 088C|
} ^>^\CP]
} _dr*`yXi
} frc{>u~t
} E5gl ^Q?Z
,E?4f
@|X
BOOL CHookApp::InitInstance() "Hht
g:
{ 9 ZGV%Tw
AFX_MANAGE_STATE(AfxGetStaticModuleState()); jn$j^51`C
hins=AfxGetInstanceHandle(); wWTQ6~Y%d
InitHotkey(); '0RRFO
return CWinApp::InitInstance(); Ff<)4`J
} B'p5M.6d#:
4\ FP
int CHookApp::ExitInstance() |'<vrn
{ xl8#=qmCD
VerifyWindow(); y\#o2PVmY
UnInit(); sLi*SR
return CWinApp::ExitInstance(); 3u_oRs
} b@6:1x
Fc'[+L--Q
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \5hw9T&[B
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .E$q&7@/j
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2h)8Fq_"
#if _MSC_VER > 1000 BSKEh"f
#pragma once skR,-:"8
#endif // _MSC_VER > 1000 RM,'o[%
> rw"Rd'
class CCaptureDlg : public CDialog nLJBq)i
{ _R74/|
// Construction p+[}Hxx=
public: u s`}
BOOL bTray; @6b[GekZ<
BOOL bRegistered; Q>=-ext}q
BOOL RegisterHotkey(); cy3M^_5B<
UCHAR cKey; fK_~lGY(
UCHAR cMask; ;Iq5|rzDn
void DeleteIcon(); K_#UZA< Y
void AddIcon(); [))JX"a
UINT nCount; _2OuskL
void SaveBmp(); -!TcQzHUs
CCaptureDlg(CWnd* pParent = NULL); // standard constructor D0 ruTS
// Dialog Data .&iN(Bd
//{{AFX_DATA(CCaptureDlg) A"4@L*QV
enum { IDD = IDD_CAPTURE_DIALOG }; 3ji:O T
CComboBox m_Key; +
|C=ZU
BOOL m_bControl; ^f|<R8 `
BOOL m_bAlt; U5<@<j(@
BOOL m_bShift; o/1JO_41
CString m_Path; RZh}:
CString m_Number; X+iK<F$
//}}AFX_DATA !M(:U,?B
// ClassWizard generated virtual function overrides 0`n
5x0R
//{{AFX_VIRTUAL(CCaptureDlg) 8=F %+
public: jDTUXwx7V
virtual BOOL PreTranslateMessage(MSG* pMsg); JZ=5Bpw
protected: {ma;G[!
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4SR(->@
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); g1@wf
//}}AFX_VIRTUAL bS rZ{l
// Implementation j Nc<~{/
protected: GNU;jSh5
HICON m_hIcon; s;1e0n
// Generated message map functions z0Xa_w=
//{{AFX_MSG(CCaptureDlg) m*oc)x7'
virtual BOOL OnInitDialog(); rzu
s
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tpYa?ZCM
afx_msg void OnPaint(); eYEc^nC,c)
afx_msg HCURSOR OnQueryDragIcon(); Hk u=pr3Gn
virtual void OnCancel(); 4RQ5(YTTuR
afx_msg void OnAbout(); Y<Q\d[3^F
afx_msg void OnBrowse(); qq;b~ 3kW
afx_msg void OnChange(); k1fRj_@WPT
//}}AFX_MSG !ZrB^?sO
DECLARE_MESSAGE_MAP() :JlDi>B
}; D|Si)_
Iz
#endif 4j3oT)+8
x=,8[W#XT
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file GN%(9N'W
#include "stdafx.h" _7@z_i_c
#include "Capture.h" ]l[2hy=
cV
#include "CaptureDlg.h" l>7r2;
#include <windowsx.h> J]fS({(\I
#pragma comment(lib,"hook.lib") |zpx)8Q
#ifdef _DEBUG ?@UAL.y
#define new DEBUG_NEW GMm'of#
#undef THIS_FILE A5XR3$5P
static char THIS_FILE[] = __FILE__; :woa&(wN;1
#endif <Wy>^<`
#define IDM_SHELL WM_USER+1 *]x_,:R6Ow
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a)S7}0|R
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C) .2gQ
G
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ce' TYkPM
class CAboutDlg : public CDialog 0JXqhc9'
{ lIh[|]
public: ]yLhJ_^
CAboutDlg(); 9=$!gC)
// Dialog Data W-D[z#)/Y
//{{AFX_DATA(CAboutDlg) kG^dqqn6
enum { IDD = IDD_ABOUTBOX }; 'msmXX@q
//}}AFX_DATA >IY,be6>P
// ClassWizard generated virtual function overrides 5AOfp2O
//{{AFX_VIRTUAL(CAboutDlg) 2OalAY6RS
protected: J#7y<
s
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @!\K>G >9[
//}}AFX_VIRTUAL ]a/'6GbR
// Implementation GZ8:e3ri
protected: I7mG/
//{{AFX_MSG(CAboutDlg) <zfKC
//}}AFX_MSG F_ljx
DECLARE_MESSAGE_MAP() L'9N9CR{i
}; *IZf^-=Q
HarFE4V
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) R0<< f]
{ U:|H9+5
//{{AFX_DATA_INIT(CAboutDlg) J&6:d
//}}AFX_DATA_INIT Gzm$OHbn
} o~C('1Fdb
ez*jjm
void CAboutDlg::DoDataExchange(CDataExchange* pDX) iP "EA8
{ =nVmthGw
CDialog::DoDataExchange(pDX); VJ{pN ~_1
//{{AFX_DATA_MAP(CAboutDlg) SI*^f\lu
//}}AFX_DATA_MAP <y>:B}9'
} )i!^]| $
Dg2uE8k
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7>-yaL{
//{{AFX_MSG_MAP(CAboutDlg) %j{.0H
// No message handlers QIV%6q+*R
//}}AFX_MSG_MAP h^M^7S
END_MESSAGE_MAP() %^.P~s6
I]uhi{\C
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @2e2^8X7f
: CDialog(CCaptureDlg::IDD, pParent) Pp_V5,i\
{ nY^Nbh0
//{{AFX_DATA_INIT(CCaptureDlg) d
4O
m_bControl = FALSE; ;[6&0!N\
m_bAlt = FALSE; -&Gfh\_NW
m_bShift = FALSE; hz)9"B\S
m_Path = _T("c:\\"); f\K#>u*
Q
m_Number = _T("0 picture captured."); 2F?kjg,
nCount=0; n`L,]dco
bRegistered=FALSE; h0VzIuV
bTray=FALSE; uD)-V;}P@;
//}}AFX_DATA_INIT ;nB2o-%
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 bPd-D-R
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -7`-wu
} ]k+m=OR{/
D,rZ0?R
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z+idLbIs
{ +?d} 7zh
CDialog::DoDataExchange(pDX); HDS"F.l5
//{{AFX_DATA_MAP(CCaptureDlg) \*"`L3
DDX_Control(pDX, IDC_KEY, m_Key); xl]
;*&
DDX_Check(pDX, IDC_CONTROL, m_bControl); =B(mIx;m
DDX_Check(pDX, IDC_ALT, m_bAlt); G6O/(8
DDX_Check(pDX, IDC_SHIFT, m_bShift); 9L)L|4A.l
DDX_Text(pDX, IDC_PATH, m_Path); I/p]DT
DDX_Text(pDX, IDC_NUMBER, m_Number); ixw(c&gL
//}}AFX_DATA_MAP $TG?4
} .JAcPyK^
F2>%KuM
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d6.}.*7Whc
//{{AFX_MSG_MAP(CCaptureDlg) ?R6`qe_F
ON_WM_SYSCOMMAND() 0BTLcEqgZ
ON_WM_PAINT() <_:zI r,
ON_WM_QUERYDRAGICON() (pYYkR"
ON_BN_CLICKED(ID_ABOUT, OnAbout) H(qm>h$bU
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :vQM>9l7
ON_BN_CLICKED(ID_CHANGE, OnChange) /iC_!n u
//}}AFX_MSG_MAP WE.Tuo5L
END_MESSAGE_MAP() 5$Kf]ZP
T*P+Fh"
BOOL CCaptureDlg::OnInitDialog() _ #'9kx|)
{ oR %agvc^^
CDialog::OnInitDialog(); i\p:#'zk5
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lrys3
ASSERT(IDM_ABOUTBOX < 0xF000); Tbh '_F6
CMenu* pSysMenu = GetSystemMenu(FALSE); nj2gs,k
if (pSysMenu != NULL) h>3H7n.
{ Hed$ytMaGz
CString strAboutMenu; OM!=ViN(=
strAboutMenu.LoadString(IDS_ABOUTBOX); I;j3*lV_
if (!strAboutMenu.IsEmpty()) ^ d\SPZ
{ E`AYee%l
pSysMenu->AppendMenu(MF_SEPARATOR); 3N<&u
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }kPVtSQ
} 25em[Q:
} 4lz{G*u
SetIcon(m_hIcon, TRUE); // Set big icon J{~Rxa
SetIcon(m_hIcon, FALSE); // Set small icon 9S1#Lr`r
m_Key.SetCurSel(0); $G[KT):N
RegisterHotkey(); ,")F[%v
CMenu* pMenu=GetSystemMenu(FALSE); xo~g78jm7,
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); +,_c/(P
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); mk= #\>
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V0NVGRQ
return TRUE; // return TRUE unless you set the focus to a control Lt>7hBe"
} u~'OcO
T]71lRY5
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )zJ=PF
{ y8?t-Pp]1
if ((nID & 0xFFF0) == IDM_ABOUTBOX) J}@GKNm
{ %h+uD^^$
CAboutDlg dlgAbout; +X^4;
&
dlgAbout.DoModal(); g42T#p8^
} 4v qNule
else WK;(P4Z
{ 9}
*$n&B
CDialog::OnSysCommand(nID, lParam); ~3=2=Uf
} /DU*M,
} h5-d;RKE
\cZfg%PN
void CCaptureDlg::OnPaint() 8p=>?wG
{ iz`jDa Q|1
if (IsIconic()) afm_ Rrg[
{ 'h}7YP, w
CPaintDC dc(this); // device context for painting 93D
\R
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E5{n?e
// Center icon in client rectangle t _\MAK
int cxIcon = GetSystemMetrics(SM_CXICON); {A3m+_8
int cyIcon = GetSystemMetrics(SM_CYICON); M 9"-WIG@h
CRect rect; 2Xgx*'t\
GetClientRect(&rect); F<r4CHfh;
int x = (rect.Width() - cxIcon + 1) / 2; ;r!\-]5$
int y = (rect.Height() - cyIcon + 1) / 2; 0w3b~RJ
// Draw the icon 0&$xX!]
dc.DrawIcon(x, y, m_hIcon); xIgql}.
} c]v
+
else Taasi`
k
{ Mi74Xl i
CDialog::OnPaint(); :`J>bHE
} M=%!IT
} 0j$OE
^saM$e^c:
HCURSOR CCaptureDlg::OnQueryDragIcon() \!w h[qEQ\
{ $l"MXxx5I
return (HCURSOR) m_hIcon; BXA]9eK
} bp%S62Dj
J @B4
R&V
void CCaptureDlg::OnCancel() 0N VI+Z$
{ : bv|Ah
if(bTray) q6&67u0
DeleteIcon(); -eL'KO5'
CDialog::OnCancel(); /f&By
p
} b *9-}g:
;*QN9T=0
void CCaptureDlg::OnAbout() k1iLnza%
{ ('d{t:TsY
CAboutDlg dlg; ;+%Z@b%
dlg.DoModal(); if@,vc
} /q*KO\L
':sTd^V
void CCaptureDlg::OnBrowse() P)IjL&[
{ ^&m?qKN8
CString str; .e$%[)D
BROWSEINFO bi; 'w6hW7"L
char name[MAX_PATH]; UE7'B?
ZeroMemory(&bi,sizeof(BROWSEINFO)); u]*5Ex (?
bi.hwndOwner=GetSafeHwnd(); ysVi3eq
bi.pszDisplayName=name; w_H2gaQ
bi.lpszTitle="Select folder"; oCA(FQ6
bi.ulFlags=BIF_RETURNONLYFSDIRS; >0V0i%inmF
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0n5!B..m}
if(idl==NULL) ^0Q'./A{&
return; \G3!TwC%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [B,p,Q"
str.ReleaseBuffer(); 2 `&<bt[g
m_Path=str; dXO=ZU/N
if(str.GetAt(str.GetLength()-1)!='\\') KpGUq0d@
m_Path+="\\"; ue9h
UpdateData(FALSE); J)huy\>,
} qUg9$oh{LI
8t\}c6/3"
void CCaptureDlg::SaveBmp() Ky6+~>
{ 6eo4#/+%
CDC dc; I61%H9;
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;^ov~PPl
CBitmap bm; >13/h]3
int Width=GetSystemMetrics(SM_CXSCREEN); l0#4Fma
int Height=GetSystemMetrics(SM_CYSCREEN); $WClpvVj
bm.CreateCompatibleBitmap(&dc,Width,Height); 0etwz3NuW
CDC tdc; nNs .,J)
tdc.CreateCompatibleDC(&dc); [`9^QEj
CBitmap*pOld=tdc.SelectObject(&bm); G"C;A`6
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;NG1{]|Z
tdc.SelectObject(pOld); Gl;f#}
BITMAP btm; mt^`1ekoY
bm.GetBitmap(&btm); \!4|tBKVY
DWORD size=btm.bmWidthBytes*btm.bmHeight; ;q&0,B
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /f]/8b g>
BITMAPINFOHEADER bih; K @C4*?P
bih.biBitCount=btm.bmBitsPixel; hiIyaWU
bih.biClrImportant=0; :iEA UM
bih.biClrUsed=0; 9'X@@6b*'
bih.biCompression=0; _XWnS9
bih.biHeight=btm.bmHeight; <S{7Ro
bih.biPlanes=1; e?1KbJ?.
bih.biSize=sizeof(BITMAPINFOHEADER); m0C{SBn-M
bih.biSizeImage=size; 0@v2*\D#
bih.biWidth=btm.bmWidth; UAKu_RO6S
bih.biXPelsPerMeter=0; D&f!( n
bih.biYPelsPerMeter=0; %r P !
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S;h&5.p
static int filecount=0; x97H(*
CString name; dm 2EH
name.Format("pict%04d.bmp",filecount++); 9.]kOs_
name=m_Path+name; `fMpV8vv
BITMAPFILEHEADER bfh; ()B7(Y
bfh.bfReserved1=bfh.bfReserved2=0; 9R>~~~{-Go
bfh.bfType=((WORD)('M'<< 8)|'B'); r},lu=em
bfh.bfSize=54+size; HSC6;~U
bfh.bfOffBits=54; Tplg2p%k
CFile bf; `Jqf**t
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ H\d;QN9Q;
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kw#X]`c3
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AbG &9=Ks
bf.WriteHuge(lpData,size); sy=dY@W^
bf.Close(); U\?+s2I)v
nCount++; ,0,Oe=d
} ?#i|>MRR>
GlobalFreePtr(lpData); jf 8w7T
if(nCount==1) kAt
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m_Number.Format("%d picture captured.",nCount); GqMB^Ad
else `xGT_0&ck
m_Number.Format("%d pictures captured.",nCount); @Rf^P(
UpdateData(FALSE); tbS#^Y
} nAvs~J
Yu;9&b
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)
.=CH!{j
{ :^5>wDu{
if(pMsg -> message == WM_KEYDOWN) _}^u-fJ/~
{ 3jS7 uU
if(pMsg -> wParam == VK_ESCAPE) &rcdr+'
return TRUE; s4N,^_j
if(pMsg -> wParam == VK_RETURN) xlk5Gob*
return TRUE; ;8uHRcdQ
} A`g.[7
return CDialog::PreTranslateMessage(pMsg); -FaaFw:Z;A
} cX Ma\#P
~\3l!zIq
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mfz"M)1p1
{ Wy!uRzbBv
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 03C .Xh=!
SaveBmp(); Z"]xdOre
return FALSE; $q^O%(
} sN=KR qe
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ vv!Bo~L1,
CMenu pop; 8ZFH}v@V1'
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); shD+eHo$
CMenu*pMenu=pop.GetSubMenu(0); PH[4y:^DN
pMenu->SetDefaultItem(ID_EXITICON); i:{:xKiC a
CPoint pt; PQ i
}Evxa
GetCursorPos(&pt); 5e)i!;7Uv
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); vyujC`61d
if(id==ID_EXITICON) n~.% p
DeleteIcon(); [Zh2DNp
else if(id==ID_EXIT) k5q(7&C
OnCancel(); yZ ?$8r
return FALSE; x!>d
6lgej
} pA*i!.E/b
LRESULT res= CDialog::WindowProc(message, wParam, lParam); aw]8V:)$J
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =m7C Jc
AddIcon(); uRFNfX(*
return res; 8cB=}XgYS
} *XHj)DC;
50COL66:7
void CCaptureDlg::AddIcon() J#+Op/mmo
{ y _6r/z^
NOTIFYICONDATA data; BL7>dZOa
data.cbSize=sizeof(NOTIFYICONDATA); 'r6 cVBb}
CString tip; xS-w\vbLV
tip.LoadString(IDS_ICONTIP); b#e]1Q
data.hIcon=GetIcon(0); @PKAz&0
data.hWnd=GetSafeHwnd(); 4_WH
6Z
strcpy(data.szTip,tip); v [dAywW
data.uCallbackMessage=IDM_SHELL; OW?uZ<z
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; >=bt
data.uID=98; X,&`WPA:S
Shell_NotifyIcon(NIM_ADD,&data); 3Nc'3NPQ'
ShowWindow(SW_HIDE); e5QOB/e&
bTray=TRUE; ]Kof sU_{
} 3Sk5I%
EkDws`@
void CCaptureDlg::DeleteIcon() GpScc'a7
{ makaI0M
NOTIFYICONDATA data; U-ERhm>uk
data.cbSize=sizeof(NOTIFYICONDATA); pz.Y=V\t
data.hWnd=GetSafeHwnd(); 6V+V
zDo
data.uID=98; =P1RdyP
Shell_NotifyIcon(NIM_DELETE,&data); ?U=mcdqd
ShowWindow(SW_SHOW); PKl]GegP
SetForegroundWindow(); i[mC3ghM6,
ShowWindow(SW_SHOWNORMAL); !'+\]eA
bTray=FALSE; <##|311o
} fi5YMYd1
C+DG+_%V*S
void CCaptureDlg::OnChange() _xa}B,H
{ 2-QuT"Gkd
RegisterHotkey(); Fka1]|j9
} k>7gy?Y!K<
u}^a^B$
BOOL CCaptureDlg::RegisterHotkey() llHN2R%(
{ S_a :ML<
UpdateData(); 8moUK3w
UCHAR mask=0; ?0? x+
UCHAR key=0; l#
}As.o}
if(m_bControl) :P HUsy
mask|=4; `^?}s-H+
if(m_bAlt) )Uc$t${en
mask|=2; !."Izz/
if(m_bShift) zuK/(qZ
mask|=1; 9Ilfv
key=Key_Table[m_Key.GetCurSel()]; =PI^X\if88
if(bRegistered){ 3| GNi~
DeleteHotkey(GetSafeHwnd(),cKey,cMask); >fW+AEt\JB
bRegistered=FALSE; '#;,oX~5
} 'm
cMask=mask; (xI)"{
cKey=key; <\B],M1=s=
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); VaOpO8y`
return bRegistered; AN|jFSQ'
} 4he v
;
Z&AHM &,yj
四、小结 r)) $XM
6-)7:9y
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。