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:
>hO9b;F}
R?HuDxHk 一、实现方法
L\xR<m<, P(aN6)D 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:
pvhN.z ..Bf-)w #pragma data_seg("shareddata")
zKfY0A R HHOOK hHook =NULL; //钩子句柄
c7A]\1 ~ UINT nHookCount =0; //挂接的程序数目
[Gc9
3PA7q static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
t5k=ngA static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
w+gPU1|(r static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Ie(M9QMp static int KeyCount =0;
7V-uQ)* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
5M\bH'1 #pragma data_seg()
sp6A*mwl ),XDY_9K 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。
!q 9PO upiYo(sN. 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:
AI]lG]q8 (}
wMU]!_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
<xUX&J=; cKey,UCHAR cMask)
dy4~~~^A {
Bhk@0\a BOOL bAdded=FALSE;
EN5F*s@r for(int index=0;index<MAX_KEY;index++){
H`
h]y if(hCallWnd[index]==0){
jD?*sd hCallWnd[index]=hWnd;
!:Ob3Mq\ HotKey[index]=cKey;
H3+P;2{ HotKeyMask[index]=cMask;
$:D\yZ, bAdded=TRUE;
Qn}M KeyCount++;
!d&SVS^mo break;
QBjvbWoIG( }
]QJ7q} }
%*OQH?pyx} return bAdded;
@s0 mX3P }
|xrnLdng0R //删除热键
NmTo/5s BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
8;O /x {
IU\h,Ug BOOL bRemoved=FALSE;
o\X|\nUk for(int index=0;index<MAX_KEY;index++){
2FQTu*p&B if(hCallWnd[index]==hWnd){
4P?@NJp if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
5C-XQS1 hCallWnd[index]=NULL;
q^6l`JJ HotKey[index]=0;
:XB^IyO-A HotKeyMask[index]=0;
Zou;o9Ww bRemoved=TRUE;
%II o KeyCount--;
gnlU break;
=l>=]O~h }
3[<D"0#}, }
.f`KP!p. }
<MJ-w1A return bRemoved;
ne%(`XY{Q] }
DK1{Z;Z LeYI<a@n@$ /]2I%Q DLL中的钩子函数如下:
w{ Pl UL"
M?).5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?;ZnD(4? {
G4uA&"OE BOOL bProcessed=FALSE;
!J[! i"e if(HC_ACTION==nCode)
uCc5) {
mt4X if((lParam&0xc0000000)==0xc0000000){// 有键松开
} wx(P3BHD switch(wParam)
^(KDtc {
NMESGNa)z case VK_MENU:
WQMoAPfqL MaskBits&=~ALTBIT;
)1f.=QZN^; break;
S2EV[K8# case VK_CONTROL:
x[mh^V5ld MaskBits&=~CTRLBIT;
\zhCGDm1_ break;
xW58B case VK_SHIFT:
f/U~X; MaskBits&=~SHIFTBIT;
a0's6C break;
}>_ default: //judge the key and send message
Qe`Nb4xf break;
zICrp }
*!yA'z< for(int index=0;index<MAX_KEY;index++){
Z9i~>k if(hCallWnd[index]==NULL)
2\CZ"a#[ continue;
(&M,rW~Qxs if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#)4p,H {
3U*4E?g SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
O;.DQ bProcessed=TRUE;
vd/ BO }
cbW=kQc_ }
~J
>Jd }
HBA|NV3. else if((lParam&0xc000ffff)==1){ //有键按下
t-Ble switch(wParam)
G<Urj+3/Xo {
Nhtc^DX case VK_MENU:
^G
"Qp8 " MaskBits|=ALTBIT;
X$eR RSW break;
'l3 DP case VK_CONTROL:
%&wi@ *# MaskBits|=CTRLBIT;
)"%J~:`h} break;
>RrG&Wv59 case VK_SHIFT:
xu>grj MaskBits|=SHIFTBIT;
sTvw@o* break;
Fe2t[y:8h default: //judge the key and send message
<2wC)l3j* break;
/< Dtu UM }
1w+)ne_& for(int index=0;index<MAX_KEY;index++){
9TEAM<b; if(hCallWnd[index]==NULL)
tO3#kV\, continue;
$<L@B|}F) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
eTI?Mu>C {
r+tHVh SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fIn^a3TV bProcessed=TRUE;
$ )6x3&]P }
0Kg?X }
Q1(4l?X@ }
C%#u2C2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
VdGpreRPC for(int index=0;index<MAX_KEY;index++){
3teP6|K'g if(hCallWnd[index]==NULL)
fM"&=X continue;
m@YK8c#$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{gzVbZ# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
M3eFG@, //lParam的意义可看MSDN中WM_KEYDOWN部分
(/ -90u }
"YVr/u }
bd2QQ1[1vh }
PgsG*5WQ return CallNextHookEx( hHook, nCode, wParam, lParam );
ssl.Y! }
o* e'D7 GtKSA#oYZB 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:
:es=T`("A8 %zO>]f& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u5Mg BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
CtZOIx.;| szD9z{9"y 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:
%eGI]!vf )[ejb?{d LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
#q5tG\gnM {
EXR6Vb, if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
/x\~5cC {
;O~%y' //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
55=YM'5] SaveBmp();
)_}xK={ return FALSE;
i?,\>LTG }
0n\AUgVPF …… //其它处理及默认处理
.vd*~U" }
^FZ9q $"va8, ):fu]s" 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。
G/_xn5XDD M|R\[
Zf 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。
g+Y &rz }0]iS8*tL 二、编程步骤
WkV0,_(P X]dN1/_ 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";
:_Iz(
2hV xmtD0U1 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
<RcB: h ,rOh*ebF 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;
5?|y%YH;R\ \\{78WDA 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;
+ -rSO"nc O{Q+<fBC9 5、 添加代码,编译运行程序。
cfy9wD IR32O,) 三、程序代码
s~k62 ]#7baZ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
99n;%W> #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
=w<iYO #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
fw|t`mUGu #if _MSC_VER > 1000
Ex6Kxd}8 #pragma once
=6N=5JePB #endif // _MSC_VER > 1000
pp2 Jy{\d #ifndef __AFXWIN_H__
/=QsZ,~xo #error include 'stdafx.h' before including this file for PCH
Z1p%6f` #endif
Q+'fTmT[, #include "resource.h" // main symbols
M
#%V%< class CHookApp : public CWinApp
ony;U#^T {
iZ0(a public:
lq?N>~PG CHookApp();
cW?6Iao // Overrides
dvglh?7d // ClassWizard generated virtual function overrides
Kr`.q:0GK //{{AFX_VIRTUAL(CHookApp)
Xd.y or public:
'=d y
= virtual BOOL InitInstance();
(e9hp2m virtual int ExitInstance();
`:2np{ //}}AFX_VIRTUAL
(~(FQ:L%U //{{AFX_MSG(CHookApp)
"V,dH%&j // NOTE - the ClassWizard will add and remove member functions here.
mn(MgJKQ\ // DO NOT EDIT what you see in these blocks of generated code !
K
k^!P*# //}}AFX_MSG
k"cKxzB DECLARE_MESSAGE_MAP()
xX~m Fz0C };
NkQain9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
>f;oY9 {m BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
$GVf;M2* BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z[JM ]Wy BOOL InitHotkey();
nVGOhYn BOOL UnInit();
lg@q}
]1 #endif
K%SfTA1TCB Mi`t$hmP //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
rWBgYh #include "stdafx.h"
vVo# nzeZ5 #include "hook.h"
HBw0N? #include <windowsx.h>
o/!a7>xO4 #ifdef _DEBUG
`2'*E\ #define new DEBUG_NEW
2 xi@5;! #undef THIS_FILE
#QW%
;^ static char THIS_FILE[] = __FILE__;
" j:15m5 #endif
0JhUncx #define MAX_KEY 100
@!(V0 - #define CTRLBIT 0x04
lPz5.(5' #define ALTBIT 0x02
<q|eG\01S #define SHIFTBIT 0x01
~$bQ;`,L #pragma data_seg("shareddata")
;;LiZlf HHOOK hHook =NULL;
?_/T$b] UINT nHookCount =0;
?[lKft
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
b~K-mjJI static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
?\a';@h static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
[wJl]i static int KeyCount =0;
M5S<N_+Pe static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
L/O:V^1 #pragma data_seg()
o5NrDDH HINSTANCE hins;
4_\]zhS void VerifyWindow();
td2bL4 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
2K2jko9'a //{{AFX_MSG_MAP(CHookApp)
$7\hszjZ // NOTE - the ClassWizard will add and remove mapping macros here.
JI92Dc*o // DO NOT EDIT what you see in these blocks of generated code!
8SMa5a{ //}}AFX_MSG_MAP
0y#TGM|0D END_MESSAGE_MAP()
?^:
xNRE$j f&Meiu+ CHookApp::CHookApp()
iS28p {
ivi&; // TODO: add construction code here,
{7FD-Q[tS // Place all significant initialization in InitInstance
i(<do "Am< }
1Q9eS& N~M-|^L CHookApp theApp;
LD}ZuCp! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
.{k^
tf4 {
dp>Lh TLc BOOL bProcessed=FALSE;
HoKN<w if(HC_ACTION==nCode)
ZlYb8+rW {
p:^;A/D if((lParam&0xc0000000)==0xc0000000){// Key up
^VB_>|UN4 switch(wParam)
ZD]5"oHY {
9Dy/-%Ut9 case VK_MENU:
,0[h`FN MaskBits&=~ALTBIT;
gUxJ>~ break;
.;9I:YB$ case VK_CONTROL:
81U(*6 MaskBits&=~CTRLBIT;
oNr~8CA` break;
2qUC@d<K case VK_SHIFT:
]#x?[F MaskBits&=~SHIFTBIT;
eVbaxL!Q^ break;
|Xl,~-. default: //judge the key and send message
vc(6lN9> break;
c1p*}T }
AZYu/k for(int index=0;index<MAX_KEY;index++){
H?axlRmw3 if(hCallWnd[index]==NULL)
Y$?<y continue;
h+h`0(z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
c~+l|r=u? {
I-
X|- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Y r^C+Oyg bProcessed=TRUE;
3?GEXO&,E }
I8 {2cM; }
j5;eSL@/ }
`7zNVYur8 else if((lParam&0xc000ffff)==1){ //Key down
r z%=qY switch(wParam)
{!hA^[}| {
zy9# *gGq case VK_MENU:
P:yMj&) MaskBits|=ALTBIT;
JY tM1d break;
+kKfx! case VK_CONTROL:
xI7;(o" MaskBits|=CTRLBIT;
?5!>k^q break;
dF%sD|<) case VK_SHIFT:
skn`Q>a MaskBits|=SHIFTBIT;
w;(`!^xv break;
+[
944n default: //judge the key and send message
I)Dd"I break;
fhAK^@h }
QviH+9 for(int index=0;index<MAX_KEY;index++)
czf|c {
W=Ru?sG= if(hCallWnd[index]==NULL)
3%<xM/# continue;
Y&k6Xhuao if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8*^Q#;^~99 {
/CAi%UH,F SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
e8@@Pi<sB bProcessed=TRUE;
'o2x7~C@ }
Yl+r>+^ }
nkp!kqJ09 }
Q2)z1'Wv if(!bProcessed){
WX}"Pj/6 for(int index=0;index<MAX_KEY;index++){
gNO<`9q if(hCallWnd[index]==NULL)
z Uqt^_ continue;
Yq.Cz:>b if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
qsUlfv9L6 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
V Z[[zYe }
/u
}AgIb }
j1)HIQE|5f }
9i8D_[ return CallNextHookEx( hHook, nCode, wParam, lParam );
H/p<lp }
WVp7H Oc;0*v[I BOOL InitHotkey()
qHfs*MBJ% {
@O<kjR<b if(hHook!=NULL){
qTnfiYG} nHookCount++;
Q9N=yz return TRUE;
>WMH.5p }
SxYX`NQ else
`Njv#K} U hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
~l%Dcp if(hHook!=NULL)
)FM/^ nHookCount++;
N0h"EV[ return (hHook!=NULL);
>+=)Q,|R }
A\Q]o#U BOOL UnInit()
BlS0I%SN {
&3mseU if(nHookCount>1){
Ud0%O nHookCount--;
d{@X-4k: return TRUE;
8@|_];9#. }
|,j6cFNw BOOL unhooked = UnhookWindowsHookEx(hHook);
nJny9g if(unhooked==TRUE){
P8e1J0A nHookCount=0;
>~I~!i3 hHook=NULL;
MN|y5w}$u }
Re('7m h~ return unhooked;
BclZsU=xn }
G8@({EY !}^c.<38Q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
zr?%k]A%UO {
Dg/&m*Yl BOOL bAdded=FALSE;
_d&zHlc_ for(int index=0;index<MAX_KEY;index++){
PIn' tV if(hCallWnd[index]==0){
nI%0u<=d hCallWnd[index]=hWnd;
'5KgRK" HotKey[index]=cKey;
5.#r\' Z# HotKeyMask[index]=cMask;
y@'8vOh` bAdded=TRUE;
L4'@f KeyCount++;
dfGdY"& break;
@0?Mwy! }
*I`, L/ }
X^#48*"a return bAdded;
g1L$+xD^ }
Ck2O?Ne ',`iQt!Lx BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Yva^JB {
g/W<;o<v(I BOOL bRemoved=FALSE;
3k5OYUk for(int index=0;index<MAX_KEY;index++){
I)V2cOrXM if(hCallWnd[index]==hWnd){
|]HU$GtS if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
\y{Bnp5h hCallWnd[index]=NULL;
Miqu HotKey[index]=0;
mKtZ@r)u HotKeyMask[index]=0;
Y.3]vno?X bRemoved=TRUE;
Q1IN@Db}y KeyCount--;
[ECSJc&i break;
$:s1x\ol }
,<%Y.x%4z[ }
&4sUi K" }
nZ hL return bRemoved;
BbA>1#i5] }
n`? j.
s ]y@9z b void VerifyWindow()
Il%LI {
pMYEL for(int i=0;i<MAX_KEY;i++){
,Ww)>O+ if(hCallWnd
!=NULL){ dY68wW>d|
if(!IsWindow(hCallWnd)){ OqtQLqN
hCallWnd=NULL; 4Z"DF)+}
HotKey=0; IrjKI.PR
HotKeyMask=0; @>B#2t&
KeyCount--; k/=J<?h0
} I1BVqIt1i
} nV,qC.z
} SfyZ,0
} $`.7XD}
@zB {Ig
BOOL CHookApp::InitInstance() kih;'>H<
{ |3/=dG
AFX_MANAGE_STATE(AfxGetStaticModuleState()); T|Sz~nO}f
hins=AfxGetInstanceHandle(); iKN~fGRc
InitHotkey(); AcyiP
return CWinApp::InitInstance(); 8]]uk=P
} cjHo?m'
S=~[ 6;G
int CHookApp::ExitInstance() 6C4c.+S
{ ^](sCE7
VerifyWindow(); O;9u1,%w
UnInit(); )~v`dwKj;
return CWinApp::ExitInstance(); GL_YT.(!
} 8s-y+M@.
x5YW6R.<t
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E?z3 D*U
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) YD
H!Nl
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ynvU$}w ~'
#if _MSC_VER > 1000 I?uU}NK
#pragma once B\r2M`N5
#endif // _MSC_VER > 1000 .LhIB?
E^rKS&P
class CCaptureDlg : public CDialog 'FgBYy/
{ @)1>ba
// Construction R8I%Cyc
public: N4I`6uDgD
BOOL bTray; .T
6NMIp*
BOOL bRegistered; p:Ry F4{b2
BOOL RegisterHotkey(); 2-728
UCHAR cKey; T$%r?p(s
UCHAR cMask; Atc9[<~WG
void DeleteIcon(); Ok2KTsVl
void AddIcon(); OB`(,m#
UINT nCount; k\BJs@-
void SaveBmp(); \@;$xdA$
CCaptureDlg(CWnd* pParent = NULL); // standard constructor `-W.uOZ0
// Dialog Data M<^]Ywq*p
//{{AFX_DATA(CCaptureDlg) e+6mbJ7y
enum { IDD = IDD_CAPTURE_DIALOG }; @&?E3?5ll
CComboBox m_Key; O2;FaASF
BOOL m_bControl; uNCM,J!#~
BOOL m_bAlt; JJ_b{ao<
BOOL m_bShift; U;`C%vHff
CString m_Path; }A jE- K{
CString m_Number; d-c<dS+R
//}}AFX_DATA (
m/ujz
// ClassWizard generated virtual function overrides q\s"B.(G"
//{{AFX_VIRTUAL(CCaptureDlg) OL]P(HRm]~
public: )Tjh
virtual BOOL PreTranslateMessage(MSG* pMsg); 7irpD7P>
protected: ;\j7jz^uC
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B-^r0/y;
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %"-bG'Yc
//}}AFX_VIRTUAL g>G+?PY
// Implementation LNp{lC
protected: 5. ibH
HICON m_hIcon; 9gq+,g>E_
// Generated message map functions z^lcc7
//{{AFX_MSG(CCaptureDlg) z]_2lx2e
virtual BOOL OnInitDialog(); fF6bEJl3
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `-t8ag3
afx_msg void OnPaint(); =LXjq~p
afx_msg HCURSOR OnQueryDragIcon(); {uUV(FzF6
virtual void OnCancel(); @$}Ct
afx_msg void OnAbout(); `%QXaKO-
afx_msg void OnBrowse(); 0JFS%Yjw[
afx_msg void OnChange(); '8J!(+
//}}AFX_MSG #[f]-c(!
DECLARE_MESSAGE_MAP() $%BI8_
}; tGE=!qk
#endif {wy{L-X
'0-YFx'U0V
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file T@wgWE<0y_
#include "stdafx.h" vB74r]'F
#include "Capture.h" yPrF2@#XZ/
#include "CaptureDlg.h" 6ChFsteGFr
#include <windowsx.h> E5aRTDLq
#pragma comment(lib,"hook.lib") x~Y{
{
#ifdef _DEBUG ;b{yu|
#define new DEBUG_NEW |`ya+/ff+
#undef THIS_FILE {V,aCr
static char THIS_FILE[] = __FILE__; JDJ"D\85
#endif fmq''1u
#define IDM_SHELL WM_USER+1 Y5CDdn
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HQvJ*U4++
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3Ccy %;
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =cpUc]~
class CAboutDlg : public CDialog 4#CHX^De
{
(C;Q<
public: /#WvC;B
CAboutDlg(); T;G<62`.h
// Dialog Data 2HUw^ *3
//{{AFX_DATA(CAboutDlg) %pIP#y[4
enum { IDD = IDD_ABOUTBOX }; TZ63=m
//}}AFX_DATA hK,a8%KnFA
// ClassWizard generated virtual function overrides MaPOmS8?
//{{AFX_VIRTUAL(CAboutDlg) 2E8G5?qe)
protected: Lqdapx"Z_
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AsD$M*It
//}}AFX_VIRTUAL dz?On\66
// Implementation &~Pk*A_:
protected: ,<N{Y[n]e
//{{AFX_MSG(CAboutDlg) @@j:z;^|
//}}AFX_MSG 0SfW:3
DECLARE_MESSAGE_MAP()
1fvN[
}; Q 0G5<:wc
hq&|
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =z;]FauR!
{ &|j0GP&
//{{AFX_DATA_INIT(CAboutDlg) R#T
6]
//}}AFX_DATA_INIT &?1O D5
} {,i-V57-h
\-pqqSy
void CAboutDlg::DoDataExchange(CDataExchange* pDX) n$`+03 a
{ P1AC2<H
CDialog::DoDataExchange(pDX); D2g/P8.<A
//{{AFX_DATA_MAP(CAboutDlg) !zvjgDlZv
//}}AFX_DATA_MAP S)g:+P
} a2Nxpxho
HCsd$M;Hbv
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =\_gT=tZ
//{{AFX_MSG_MAP(CAboutDlg) HdgNy \
// No message handlers z3]W #
//}}AFX_MSG_MAP Q^ZM| (s#
END_MESSAGE_MAP() ~|9VVeE
(BFwE@1"
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) xL1Li]fM!'
: CDialog(CCaptureDlg::IDD, pParent) 0
zK{)HZ
{ e@qH!.g)
//{{AFX_DATA_INIT(CCaptureDlg) ]/kpEx
m_bControl = FALSE; 5VP0Xa ~
m_bAlt = FALSE; "!D y[J
m_bShift = FALSE; F@k}p-e~
m_Path = _T("c:\\"); $,2T~1tE
m_Number = _T("0 picture captured."); hVmnXT
3Z
nCount=0; oz>2P.7
bRegistered=FALSE; W^H3 =hZ
bTray=FALSE; !b7"K|
//}}AFX_DATA_INIT ;xe.0j0h
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 w8>h6x"
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *
eC[74Kng
} 4MS#`E7LrC
H)i|?3Ip
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3r,~-6
{ ;RJ
8h
x
CDialog::DoDataExchange(pDX); ZaU8eg7
//{{AFX_DATA_MAP(CCaptureDlg) {@vnKyf^K
DDX_Control(pDX, IDC_KEY, m_Key); +:uz=~mo`
DDX_Check(pDX, IDC_CONTROL, m_bControl); &G\mcstX
DDX_Check(pDX, IDC_ALT, m_bAlt); / n_s"[I4
DDX_Check(pDX, IDC_SHIFT, m_bShift); \OA{&G.
DDX_Text(pDX, IDC_PATH, m_Path); ?T2>juf]5~
DDX_Text(pDX, IDC_NUMBER, m_Number); hK{H7Ey*
//}}AFX_DATA_MAP Mn(iAsg
} Inv`C,$7Q#
hp)^s7H
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ey=KA t
//{{AFX_MSG_MAP(CCaptureDlg) EM*I%|n@m
ON_WM_SYSCOMMAND() OIL8'xY.w
ON_WM_PAINT() /O}<e TR
ON_WM_QUERYDRAGICON() bO2?DszT5
ON_BN_CLICKED(ID_ABOUT, OnAbout) 8Rwk
o6x
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8^>c_%e}
ON_BN_CLICKED(ID_CHANGE, OnChange) PQkw)D<n]_
//}}AFX_MSG_MAP v^b4WS+.:
END_MESSAGE_MAP() qU7_%Z
OALNZKP
BOOL CCaptureDlg::OnInitDialog() SOhM6/ID2/
{ ? +L,
CDialog::OnInitDialog(); GYx0U8MJ[e
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &7f8\TG|
ASSERT(IDM_ABOUTBOX < 0xF000); RyJy%|\-S
CMenu* pSysMenu = GetSystemMenu(FALSE); ]a4U\yr
if (pSysMenu != NULL) JP5e=Z<
{ mkn1LzE|F
CString strAboutMenu; r k W7;!
strAboutMenu.LoadString(IDS_ABOUTBOX); yx5e
if (!strAboutMenu.IsEmpty()) cK+TE8ao
{ RJ{$`d
pSysMenu->AppendMenu(MF_SEPARATOR); g0tnt)]
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N
$) G8
} aDKb78 1d
} T+v*@#iJ_
SetIcon(m_hIcon, TRUE); // Set big icon x,,y}_YX
SetIcon(m_hIcon, FALSE); // Set small icon AU$~Ap*rsa
m_Key.SetCurSel(0); ;o!p9MEpz;
RegisterHotkey(); |#@7$#j
CMenu* pMenu=GetSystemMenu(FALSE); NS[eQ_rT
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -I|xW
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hy*{{f;
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JpC'(N
return TRUE; // return TRUE unless you set the focus to a control ,Z@#( =f
} ?{S>%P A_B
X&pYLm72;
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dH^6K0J
{ x%}D+2ro-t
if ((nID & 0xFFF0) == IDM_ABOUTBOX) VI2lwE3
{ hpAdoy[
CAboutDlg dlgAbout; )hZ7`"f,ZN
dlgAbout.DoModal(); 7Jf~Bn
} <k:I2LF_
else -F ~DOG%
{ N)X Tmh2v|
CDialog::OnSysCommand(nID, lParam); ?G,4N<]Nu
} _uQ]I^ 'D
} q-JTGCFl
&kg^g%%
void CCaptureDlg::OnPaint() $D^\[^S
{ |p6d]#z3
if (IsIconic()) @t9HRL?T~
{ GJ,&$@8)
CPaintDC dc(this); // device context for painting >v:ex(y0
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); M~:_^B
// Center icon in client rectangle rVz.Ws#
int cxIcon = GetSystemMetrics(SM_CXICON); F0:]@0>r
int cyIcon = GetSystemMetrics(SM_CYICON); RQ,#TbAe
CRect rect; lMFR_g?r
GetClientRect(&rect); ]8p{A#1
int x = (rect.Width() - cxIcon + 1) / 2; Z1
D
int y = (rect.Height() - cyIcon + 1) / 2; w]wZJ/U`
// Draw the icon Mn0.!J
"
dc.DrawIcon(x, y, m_hIcon); \OwF!~&
} L/8oqO|
else / Q1*Vh4
{ QQl.5'PP
CDialog::OnPaint(); KL&/Yt
} ppAbG,7
} ?:;;0kSk
LDlYLsF9
HCURSOR CCaptureDlg::OnQueryDragIcon() .vu7$~7
{ n7!T{+ge
return (HCURSOR) m_hIcon; @>8(f#S%
} \dk1a
Tv ``\<
void CCaptureDlg::OnCancel() sVFO&|L
{ Qte5E}V`
if(bTray) *rq*li;
DeleteIcon(); !M~:#k
CDialog::OnCancel(); :5k* kx#y
} ]es|%j 2
n8,%<!F^
void CCaptureDlg::OnAbout() '.Y,VJaL
{ uKJ:)oyaCP
CAboutDlg dlg; UFB|IeX?q
dlg.DoModal(); IL@yGuO,
} u3h(EAH>
7U [C=NL
void CCaptureDlg::OnBrowse() 4&*lpl*N
{ 2Io|?
CString str; #}~tTL
BROWSEINFO bi; ioi/`iQR
char name[MAX_PATH]; SgU@`Pb
ZeroMemory(&bi,sizeof(BROWSEINFO)); RZz?_1'
bi.hwndOwner=GetSafeHwnd(); maap X/J
bi.pszDisplayName=name; @fd<
bi.lpszTitle="Select folder"; neEqw+#Z
bi.ulFlags=BIF_RETURNONLYFSDIRS; Hca(2 ]T-
LPITEMIDLIST idl=SHBrowseForFolder(&bi); K'&,]r#
if(idl==NULL) G"r{!IFL
return; SqAz((
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %<yW(s9{
str.ReleaseBuffer(); +:Zwo+\kSN
m_Path=str; h%j4(v}r{C
if(str.GetAt(str.GetLength()-1)!='\\') |]kiH^Ap
m_Path+="\\"; U#f*
UpdateData(FALSE); Gb^63.}
} IR/S`HD_
IQBL;=.J.
void CCaptureDlg::SaveBmp() DS8HSSD
{ ca=MUm=B
CDC dc; J.~@j;[2
dc.CreateDC("DISPLAY",NULL,NULL,NULL); u/tJ])~@
CBitmap bm; n^'d8Y(
int Width=GetSystemMetrics(SM_CXSCREEN); frbd{o
int Height=GetSystemMetrics(SM_CYSCREEN); 6F^/k,(k4
bm.CreateCompatibleBitmap(&dc,Width,Height); za6 hyd^
CDC tdc; 1XS~b-St
tdc.CreateCompatibleDC(&dc); x.gz sd
CBitmap*pOld=tdc.SelectObject(&bm);
4H;g"nWqO
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); wW TuEM
tdc.SelectObject(pOld); lR?1,yLp
BITMAP btm; TrDTay
bm.GetBitmap(&btm); !UzE&CirV
DWORD size=btm.bmWidthBytes*btm.bmHeight; ,5 8-h?B0v
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]`-o\,lq
BITMAPINFOHEADER bih; 2-S}#S}2C
bih.biBitCount=btm.bmBitsPixel; F]OWqUV
bih.biClrImportant=0; X'd\b}Bm
bih.biClrUsed=0; aR6~r^jB
bih.biCompression=0; K*~xy bA
bih.biHeight=btm.bmHeight; (ht"wY#T<(
bih.biPlanes=1; w[2E:Nj
bih.biSize=sizeof(BITMAPINFOHEADER); DI{Qs[
bih.biSizeImage=size; P w6l'
bih.biWidth=btm.bmWidth; W&A^.% 2l
bih.biXPelsPerMeter=0; FkMM>X
bih.biYPelsPerMeter=0; L `2{H%J`
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @V4nc
'o.
static int filecount=0; } %3;j5 ;6
CString name; Sn97DCdk
name.Format("pict%04d.bmp",filecount++); C
B;j[.
name=m_Path+name; =
CXX.%N
BITMAPFILEHEADER bfh; <MxA;A
bfh.bfReserved1=bfh.bfReserved2=0; wKW.sZ!S1
bfh.bfType=((WORD)('M'<< 8)|'B'); af'ncZ@U
bfh.bfSize=54+size; 5G<`c
bfh.bfOffBits=54; %i&am=
CFile bf; jxK
`ShW=
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .Sm 8t$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); BT:b&"AR[
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vl7V?`_4
bf.WriteHuge(lpData,size); ^b&hy&ag
bf.Close(); V(G{_>>
nCount++; 'fb&3
} j%!xb><
GlobalFreePtr(lpData); *E@as
if(nCount==1) gYL#} ) g
m_Number.Format("%d picture captured.",nCount); %z1hXh#+
else BQMo*I>I
m_Number.Format("%d pictures captured.",nCount); FN0<iL
UpdateData(FALSE); <SRSJJR|(
} 17rg!'+
-P]onD
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J<L"D/
{ c*8k _o,
if(pMsg -> message == WM_KEYDOWN) P\X$fD
{ 1
RyvPP
if(pMsg -> wParam == VK_ESCAPE) q_6<}2m,U
return TRUE; Xt*h2&
if(pMsg -> wParam == VK_RETURN) E-rGOm" m
return TRUE; e58tf3
} _t7aOH
return CDialog::PreTranslateMessage(pMsg); U_0"1+jbq
} X{5(i3?S
9&4z4@on
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) cj3P]2B#
{ w##$SaTI
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &ZPyZj
SaveBmp(); ~EhM"go
return FALSE; NSh~O!pX
} 1`&"U[{
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;x=0+0JD
CMenu pop; A3e83g~L
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !vSj1w
CMenu*pMenu=pop.GetSubMenu(0); DmpD`^?-L
pMenu->SetDefaultItem(ID_EXITICON); &q[`lIV, L
CPoint pt; *+cW)klm
GetCursorPos(&pt); [RUYH5>Ik
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); k'{Bhi4
if(id==ID_EXITICON) TqXB2`7Ri
DeleteIcon();
Hn,;G`{
else if(id==ID_EXIT) TzY[-YlvF
OnCancel(); n|I5ylt
return FALSE; uyWt{>$
} 1A\N$9Dls
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 39,7N2 uY
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sq'bo8r
AddIcon(); V> @+&q
return res; }EWPLJA
} _ye74$#
{`1gDKH
void CCaptureDlg::AddIcon() ^NiS7 )FX
{ /aD3E"Op
NOTIFYICONDATA data; .qk_m-o
data.cbSize=sizeof(NOTIFYICONDATA); ;JQ;LbEn
CString tip; V17SJSC-
tip.LoadString(IDS_ICONTIP); dJD8c2G
data.hIcon=GetIcon(0); <2>Qr(bb
data.hWnd=GetSafeHwnd(); dBMr%6tz
strcpy(data.szTip,tip); rOd~sa-H
data.uCallbackMessage=IDM_SHELL; iqPMCOPZ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &C=[D_h
data.uID=98; uMe]].04
Shell_NotifyIcon(NIM_ADD,&data); 1US4:6xX_
ShowWindow(SW_HIDE); 5WvtvSO
bTray=TRUE; Gg=Y}S7:
} %gE*x
#
kls
6Dk#
void CCaptureDlg::DeleteIcon() a"&Gs/QKSC
{ fC$(l@O?
NOTIFYICONDATA data; YRm6~c
data.cbSize=sizeof(NOTIFYICONDATA); a8laPN
data.hWnd=GetSafeHwnd(); '6zD`Q
data.uID=98; YZ0Jei8+-
Shell_NotifyIcon(NIM_DELETE,&data); $,9A?'
ShowWindow(SW_SHOW); CDU$Gi
SetForegroundWindow(); UiLiy?EJ
ShowWindow(SW_SHOWNORMAL); qz<>9n@o
bTray=FALSE; MYVgi{
} w[X/|O
soXIPf
void CCaptureDlg::OnChange() "MNI_C#{
{ )UgLs|G~
RegisterHotkey(); &nyJ :?
} NP^j5|A*"
{N2MskK
BOOL CCaptureDlg::RegisterHotkey() 7)#8p@Q
{ 3"HW{=
UpdateData(); E+!A0!1
UCHAR mask=0; BL^\"Xh$|
UCHAR key=0; Uop`)
if(m_bControl) nWz7$O
mask|=4; Q^k\q
if(m_bAlt) +zf[Im%E
mask|=2; A4>j4\A[M
if(m_bShift) J70r`
mask|=1; bs9X4n5
key=Key_Table[m_Key.GetCurSel()]; GI _.[
if(bRegistered){ y8arFG
DeleteHotkey(GetSafeHwnd(),cKey,cMask); }@H(z
bRegistered=FALSE; jC}2>_#m(
} UHT2a9rG
cMask=mask; [ qx[ 0
cKey=key; 'YTSakNJ}
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); x^]J^L45
return bRegistered; s i=m5$V
} _ ,~D]JYE
> t~2
四、小结 _my!YS5n
O
!
iN
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。