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:
|A8xy#
`~(KbH=] 一、实现方法
j42U|CuK ) e;)9~ 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:
UStZ3A' PfF7*}P #pragma data_seg("shareddata")
UyEyk$6SU HHOOK hHook =NULL; //钩子句柄
hz>&E,<8q UINT nHookCount =0; //挂接的程序数目
6AUXYbK, static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
&
WYIfx{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}f; Zx)! static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
esLPJx static int KeyCount =0;
kzbgy)PK3 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
q/XZb@rt #pragma data_seg()
zX{[Z \2L%%M 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
V\r5 t(\d;ybyx DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
x5c
pv s@jzu BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Fwm{oypg% cKey,UCHAR cMask)
[8^jwnAYS {
NMJ230? BOOL bAdded=FALSE;
j_o6+Rk for(int index=0;index<MAX_KEY;index++){
0^?3hK if(hCallWnd[index]==0){
'<^%>R2 hCallWnd[index]=hWnd;
\T/~"
w HotKey[index]=cKey;
U*(m'Ea HotKeyMask[index]=cMask;
Y6?d
y\ bAdded=TRUE;
"F7g8vu KeyCount++;
gX{V>T(< break;
A%"mySW }
38>8{Ma }
f]h99T return bAdded;
CTD{!I( }
I'`Q_5s5 //删除热键
d-#MRl$rtK BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
s4@AK48 {
:\4?{,@_h BOOL bRemoved=FALSE;
(=j]fnH? for(int index=0;index<MAX_KEY;index++){
8;5 UO,`T if(hCallWnd[index]==hWnd){
ullq}} if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
";J1$a hCallWnd[index]=NULL;
7;dV]N HotKey[index]=0;
{[m %1O1 HotKeyMask[index]=0;
94 H\,}i8 bRemoved=TRUE;
JY"<b6C^ KeyCount--;
#c5G"^)z break;
NFDi2L>Ba }
Y`uL4)hR5 }
A%Pjg1(uX }
&\F`M|c return bRemoved;
g|9'Lk }
R.Ao%VT 8*V3g_z :5L9tNr{_ DLL中的钩子函数如下:
$*Njvr7 yxf|Njo0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
^*C8BzcH {
exiCy1[+ BOOL bProcessed=FALSE;
' &^:@V if(HC_ACTION==nCode)
od"Oq?~/t {
/VgA}[%y if((lParam&0xc0000000)==0xc0000000){// 有键松开
a-MDZT<xA+ switch(wParam)
5)wz `OS {
razVO]]E case VK_MENU:
?dl7!I@<E< MaskBits&=~ALTBIT;
iN %kF'&9 break;
~gNa<tg"1 case VK_CONTROL:
)V*Z|,#no MaskBits&=~CTRLBIT;
ULIbVy7Y break;
frWw-<HoI case VK_SHIFT:
4N[8LC;MH MaskBits&=~SHIFTBIT;
q~^Jd=cB\ break;
bJ*jJl x default: //judge the key and send message
GPy+\P` break;
nbj &3z, }
9fp1*d for(int index=0;index<MAX_KEY;index++){
[[}KCND if(hCallWnd[index]==NULL)
QmvhmsDL continue;
ArDkJ`DE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
x=pq-&9>B {
6Z] * ce<r SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
t|0Zpp; bProcessed=TRUE;
^G.PdX$M }
2j9Mr }
'2vZ%C$ }
ypM0}pdvTp else if((lParam&0xc000ffff)==1){ //有键按下
f
wWI2"} switch(wParam)
`PXSQf {
f}PT3 case VK_MENU:
ng(STvSh: MaskBits|=ALTBIT;
(]n^_G#-$ break;
8_US.52V case VK_CONTROL:
dE=4tqv-r MaskBits|=CTRLBIT;
H4ml0SS^ break;
9XImgeAs case VK_SHIFT:
v}XMFC ! MaskBits|=SHIFTBIT;
nsQx\Tnhx break;
~5<-&Dyp7 default: //judge the key and send message
I,OEor6%R( break;
h[b;_>7 }
L=nyloz,0 for(int index=0;index<MAX_KEY;index++){
LE%3..
! if(hCallWnd[index]==NULL)
4:GVZR|- continue;
M<hX!B if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
qn}4PVn4 {
g]PmmK_L SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
`bw>.Ay bProcessed=TRUE;
Squ'd }
ZT:&j4A|0 }
FGo{6'K(: }
KP`{ UD) if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
bx`s;r= for(int index=0;index<MAX_KEY;index++){
tn&~~G~# if(hCallWnd[index]==NULL)
8x#SpDI continue;
6," 86 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
3e+ Ih2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
48l!P(>?y //lParam的意义可看MSDN中WM_KEYDOWN部分
Q>]FO }
G9J+D?'hH }
Sz|;wsF{ }
P~/Glak return CallNextHookEx( hHook, nCode, wParam, lParam );
MA0}BJoW }
o,dO.isgh> Bj5_=oo+d 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:
Y -%g5 V+j58Wuf BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
s{\USD6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
lArYlR} eT* )r~ 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:
@}k5rcQ*/ MA1.I4dm LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
]f#1G$ {
Loo48 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
c `C
/U7j {
!8S$tk //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
/qp)n"> SaveBmp();
h8OmO5/H return FALSE;
qP=4D
9 ] }
J%]</J …… //其它处理及默认处理
-8H0f-1 }
(`<X9w, f'._{" w ryjs! 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。
M|IR7OtLV VX#4Gh,~N 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。
7~(|q2ib fR[kjwX)<1 二、编程步骤
naE;f) sTeW4Hnp 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";
!jZXh1g% B=?4; l7 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
E{+V_.tlu Q v=F' 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;
rBR,lS$4 h^QicvZ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
kex4U6&OQB Xi vzhI4 5、 添加代码,编译运行程序。
=^ Z1u:OI@( 三、程序代码
?&v+-4%4PI %-u Ra\ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
PU|
X+V> #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
7ip$#pzo #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ig:E`Fe@ #if _MSC_VER > 1000
~%)ug3%e #pragma once
doeYc #endif // _MSC_VER > 1000
'#JC 6#X #ifndef __AFXWIN_H__
@0js=3!2 #error include 'stdafx.h' before including this file for PCH
`+Ko{rf+9 #endif
LRe2wT>I #include "resource.h" // main symbols
^Yu<fFn class CHookApp : public CWinApp
-(;<Q_'s{" {
=>0G public:
]lgI Q;r CHookApp();
v PJ=~*P= // Overrides
myvn@OsEw // ClassWizard generated virtual function overrides
g'pB<?'E' //{{AFX_VIRTUAL(CHookApp)
bCSgdK public:
Py!
F virtual BOOL InitInstance();
(p1}i::Y8 virtual int ExitInstance();
;+Sc Vz //}}AFX_VIRTUAL
8Buus //{{AFX_MSG(CHookApp)
r;"uk+{i // NOTE - the ClassWizard will add and remove member functions here.
uO{'eT~ // DO NOT EDIT what you see in these blocks of generated code !
tB<2mjg //}}AFX_MSG
.~C[D
T+, DECLARE_MESSAGE_MAP()
+ 2j] };
gwQk
M4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
qN@-H6D1= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
D:I6nSoC BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
RHj<t"); BOOL InitHotkey();
rP<S
=eb BOOL UnInit();
{sR|W:fS$ #endif
vUD>+*D 3x6@::s~ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^;DbIo\6H #include "stdafx.h"
,^m;[Dl7 #include "hook.h"
2`V[Nb #include <windowsx.h>
6d#:v"^, #ifdef _DEBUG
J.g4I|{ #define new DEBUG_NEW
vbMt}bM(GD #undef THIS_FILE
eN Y? static char THIS_FILE[] = __FILE__;
5a^b{=#Y #endif
=.9uuF: #define MAX_KEY 100
`ZLA=oD #define CTRLBIT 0x04
4)OM58e} #define ALTBIT 0x02
w`a(285s)i #define SHIFTBIT 0x01
;qwNM~ #pragma data_seg("shareddata")
fo5+3iu^ HHOOK hHook =NULL;
[KT1.5M[ UINT nHookCount =0;
9?i~4&EY static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
*0!IHr"fn static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
m!H7;S-( static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
|.;LI=CT static int KeyCount =0;
o0`|r+E\ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
xZ.c@u6: #pragma data_seg()
!-<PV HINSTANCE hins;
U%zZw) void VerifyWindow();
Vv<Tjr BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
=c1t]%P, //{{AFX_MSG_MAP(CHookApp)
j ?gscQ3 // NOTE - the ClassWizard will add and remove mapping macros here.
8Z1pQx-P2C // DO NOT EDIT what you see in these blocks of generated code!
$Eh8s( //}}AFX_MSG_MAP
/GDGE } END_MESSAGE_MAP()
l We1Q# .V'=z| CHookApp::CHookApp()
jn/
J-X= {
7$HN5T\! // TODO: add construction code here,
0s+pcqOd^ // Place all significant initialization in InitInstance
M>kk"tyM }
p#6V|5~8 MRZ/%OZ. CHookApp theApp;
n>[" h2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
:Tu%0="ye {
5Z@~d'D BOOL bProcessed=FALSE;
InCo[ 8SI if(HC_ACTION==nCode)
KfkE'_F {
.dStV6 if((lParam&0xc0000000)==0xc0000000){// Key up
o7B }~;L switch(wParam)
V {H/>>k7 {
mE+ case VK_MENU:
;;cPt44s MaskBits&=~ALTBIT;
(bBr O74lR break;
( /): case VK_CONTROL:
^,;AM(E MaskBits&=~CTRLBIT;
!?%'Fy6t break;
^>H+#@R case VK_SHIFT:
))z1T 8 MaskBits&=~SHIFTBIT;
{6uh Ub
break;
-'jPue2\ default: //judge the key and send message
|Vq&IfP break;
LNR~F_64Q }
4X^{aIlshk for(int index=0;index<MAX_KEY;index++){
+&:?*(?Q if(hCallWnd[index]==NULL)
rt5eN:'qY continue;
y!;PBsU%Sx if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Q[U_
0O,A9 {
xU5+"t~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ygz6 ~( bProcessed=TRUE;
@uaf&my,P }
vKCgtk }
{ylhh%t4hi }
RaNz)]+7` else if((lParam&0xc000ffff)==1){ //Key down
QxjX:O switch(wParam)
aTx*6;-PH {
1; "t8.*%e case VK_MENU:
/V%]lmxQ MaskBits|=ALTBIT;
]|y]?7 break;
,& ^vc_} case VK_CONTROL:
$^1L|KgXp MaskBits|=CTRLBIT;
4\6-sL?rW break;
Qn*a#]p case VK_SHIFT:
l`}Ag8Q MaskBits|=SHIFTBIT;
;N FTdP break;
e~wJO~ default: //judge the key and send message
L`!M3c@u break;
+.RC{o, }
Qf}^x9' for(int index=0;index<MAX_KEY;index++)
[v!TQwMU {
(DW[#2\. if(hCallWnd[index]==NULL)
|4F3Gu continue;
# XD-a if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{ fmY_T[Q8 {
HcrI3v|6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_Wjd`* bProcessed=TRUE;
(xJZeY)-b^ }
8?S)>-mwv }
Viu+#J;l }
s]X]jfA. if(!bProcessed){
N~%F/`Z<+ for(int index=0;index<MAX_KEY;index++){
SgOn:xg;3L if(hCallWnd[index]==NULL)
V0Z\e
_I continue;
+6xEz67A< if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
'kD~tpZ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U1>VKP;5Nn }
B`/cKfg }
?d -$lI }
=HF||p@ return CallNextHookEx( hHook, nCode, wParam, lParam );
NTHy!y<!h }
gGiLw5o, WaVP+Ap BOOL InitHotkey()
IkU:D"n7 {
{ER%r'(4Z if(hHook!=NULL){
Z]I[?$y nHookCount++;
mkCv
f return TRUE;
ZjE!?
'(ef }
[S}o[v\ else
(L)tC*Qjc
hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
%#.HFK if(hHook!=NULL)
NC*h7 nHookCount++;
S)@95pb return (hHook!=NULL);
1,p[4k~Ww }
+M+ht BOOL UnInit()
5"IbmD>D {
WH.5vrY Z if(nHookCount>1){
~$0Qvyb> nHookCount--;
T5eXcI0t return TRUE;
%}U-g"I }
m,e@bJ- BOOL unhooked = UnhookWindowsHookEx(hHook);
QES[/i + if(unhooked==TRUE){
EV:y} nHookCount=0;
DR`d^aBWQ hHook=NULL;
2EubMG }
e,_b return unhooked;
|M?yCo }
W9{>.E? Wmp,,H BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'"H'#%RU {
MorR&K BOOL bAdded=FALSE;
$Nr :YI for(int index=0;index<MAX_KEY;index++){
"+js7U- if(hCallWnd[index]==0){
Ks.pb !r hCallWnd[index]=hWnd;
Ix,`lFbH HotKey[index]=cKey;
6g*B=d(j HotKeyMask[index]=cMask;
%y~=+Sm%m bAdded=TRUE;
C:n55BE9 KeyCount++;
1.]Py" @: break;
jUq^$+N }
%3 ecV$ }
LI[ w?6B return bAdded;
$cri"G }
@0q%&v0 T`{W$4XS BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+Io[o6* {
8>Hnv]p BOOL bRemoved=FALSE;
zrjqB3R4@O for(int index=0;index<MAX_KEY;index++){
(5%OAjW if(hCallWnd[index]==hWnd){
8t!/Op? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
vcsi@! hCallWnd[index]=NULL;
j_E$C.XU{g HotKey[index]=0;
@ oE [! HotKeyMask[index]=0;
c+/SvRx^> bRemoved=TRUE;
Zqke8q KeyCount--;
Ti
}Ljp^O break;
$-m`LF@ }
6elmLDMni\ }
*5iNw_& }
C6=7zYhR return bRemoved;
F8km8lPQl }
X8Px
N3Ub|$}q void VerifyWindow()
mh>)N" {
5V\\w~&/ for(int i=0;i<MAX_KEY;i++){
2HBYReQ if(hCallWnd
!=NULL){ }E+}\&
if(!IsWindow(hCallWnd)){ >ZKE
hCallWnd=NULL; yz!j9pJ
HotKey=0; %ci/(wL
HotKeyMask=0; @cNX\$J
KeyCount--; ]R/VE"-
} 6X5`npf
} Hd6g0
} +1Oi-$
2-
} }3cOZd_,t
XCO{}wU)>
BOOL CHookApp::InitInstance() a_/\.
{ KwOn<0P
AFX_MANAGE_STATE(AfxGetStaticModuleState()); >h/J{T(P>h
hins=AfxGetInstanceHandle(); 8moX"w\~_h
InitHotkey(); [)|P-x-<
return CWinApp::InitInstance(); |a#4
} QT /TZ:
++-\^'&1
int CHookApp::ExitInstance() 0n+Wv@/
{ U@dztX@u
VerifyWindow(); r#
5))q-
UnInit(); pS
vDH-
return CWinApp::ExitInstance();
rxQn[
} OwrzD~
KFBo1^9N
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file (Vglcj
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =jjUwcl
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !.mMO_4}
#if _MSC_VER > 1000 .vG_ \-@
#pragma once L)JpMf0
#endif // _MSC_VER > 1000 .w^M?}dx
/u{ 9UR[g
class CCaptureDlg : public CDialog MNO T<(
{ ce&)djC7U
// Construction 1 ry:Z2
public: Yw<K!'C
BOOL bTray; pc<")9U%/
BOOL bRegistered; WK]SHiHD
BOOL RegisterHotkey(); 7Xm7{`jH
UCHAR cKey; .asHFT7]9
UCHAR cMask; \"c;MK{
void DeleteIcon(); =1fO"|L
void AddIcon(); g<O*4
]=
UINT nCount; -Y%#z'^-
void SaveBmp(); l@nkR&4[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ok[y3S
// Dialog Data GEXT8f(7
//{{AFX_DATA(CCaptureDlg) )nyud$9w'
enum { IDD = IDD_CAPTURE_DIALOG }; $A)i}M;uK
CComboBox m_Key; w~QUG^0Fx
BOOL m_bControl; 7%L%dyN
BOOL m_bAlt; lq=|=
BOOL m_bShift; >l{<p(
CString m_Path; h|"98PI
CString m_Number; cAIMt]_
//}}AFX_DATA ZurQr}
// ClassWizard generated virtual function overrides 9'C kV [
//{{AFX_VIRTUAL(CCaptureDlg) D`PnY&ffT
public: FW(y#Fmqs
virtual BOOL PreTranslateMessage(MSG* pMsg); Ks:~Z9r}
protected: *_}|EuY
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J6/Mm7R
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); " &'Jw
//}}AFX_VIRTUAL [TvH7ott'1
// Implementation lG,/tMy
protected: O79;tA<k
HICON m_hIcon; |3W\^4>,
// Generated message map functions 2KMLpO&De
//{{AFX_MSG(CCaptureDlg) SC)4u l%
virtual BOOL OnInitDialog(); {@1.2AWg
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); x&7%U
afx_msg void OnPaint(); EU.vw0}u8
afx_msg HCURSOR OnQueryDragIcon(); _;",7bT80
virtual void OnCancel(); h[72iVn
afx_msg void OnAbout(); =cE:,z;g
afx_msg void OnBrowse(); -q\5)nY
afx_msg void OnChange(); 5OP$n]|(
//}}AFX_MSG Oi +(`
DECLARE_MESSAGE_MAP() #k5WTcE
}; xiuAW
#endif ^l;nBD#nJ
pe=Ou0
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b}4k-hZL
#include "stdafx.h" J"'2zg1&
#include "Capture.h" #<|5<U
#include "CaptureDlg.h" Vc|r(lM
#include <windowsx.h> d)`XG cx{=
#pragma comment(lib,"hook.lib") X1G[&
#ifdef _DEBUG HH+R47%*
#define new DEBUG_NEW I7b(fc-r
#undef THIS_FILE cC
w,b]
static char THIS_FILE[] = __FILE__; GXB4&Q!C
#endif ;:1d<Q|
#define IDM_SHELL WM_USER+1 l=*^FK]L`
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v<bq1QG
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X&DuX %x0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^57[&{MuBF
class CAboutDlg : public CDialog 9PhdoREb
{ ~a m]G0
public: o>#<c
@
CAboutDlg(); =MO2M~e!
// Dialog Data B'6^E#9
//{{AFX_DATA(CAboutDlg) w~M5)b
enum { IDD = IDD_ABOUTBOX }; L^rtypkJ
//}}AFX_DATA _i~n!v
// ClassWizard generated virtual function overrides `Yp\.K z
//{{AFX_VIRTUAL(CAboutDlg) lGqwB,K$z4
protected: >U~.I2sz
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GyJp!
xFB
//}}AFX_VIRTUAL Dr6"~5~9w
// Implementation \@nmM&7C!4
protected: J]ivIQ
//{{AFX_MSG(CAboutDlg)
At%g^
//}}AFX_MSG !e6;@ *
DECLARE_MESSAGE_MAP() 8h9t8?
}; @va{&i`%A7
#{7=
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D
h ]+HF
{ vq_W zxaG
//{{AFX_DATA_INIT(CAboutDlg) o*97Nbjn
//}}AFX_DATA_INIT w( `X P
} gwQL9
UYx
N J:]jd
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /MTS>[E
{ 6k"Wy3/
CDialog::DoDataExchange(pDX); Nt67Ye3;
//{{AFX_DATA_MAP(CAboutDlg) 4nkH0dJQ
//}}AFX_DATA_MAP yXY8 oE
} !Qrlb>1z-
Svn|vH
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VZYdCZ&l7
//{{AFX_MSG_MAP(CAboutDlg) E5 H6&XU
// No message handlers jD0^,aiG
//}}AFX_MSG_MAP n?@3R#4D3
END_MESSAGE_MAP() '1ff| c!x9
fMwJwMT8
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) S4s\ tA<
: CDialog(CCaptureDlg::IDD, pParent) KQ?E]}rZ
{ En+4@BC
//{{AFX_DATA_INIT(CCaptureDlg) Lcplc"C
m_bControl = FALSE; UBpYR>
<\
m_bAlt = FALSE; ywmx6q4MFL
m_bShift = FALSE; 9g>]m6
m_Path = _T("c:\\"); 9%oLv25{)
m_Number = _T("0 picture captured."); j9%u&
nCount=0; Z4}Yw{=f
bRegistered=FALSE; &of%;>$>M
bTray=FALSE; s7 O?)f f
//}}AFX_DATA_INIT "vH@b_>9|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =NAL*4c+
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B^U5=L[:p
} .,l?z
ex $d~
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zdyS"H}
{ CcgCKT
CDialog::DoDataExchange(pDX); gTW(2?xYf
//{{AFX_DATA_MAP(CCaptureDlg) #$K\:V+ 4
DDX_Control(pDX, IDC_KEY, m_Key); "pdG%$
DDX_Check(pDX, IDC_CONTROL, m_bControl); h_?D%b~5
DDX_Check(pDX, IDC_ALT, m_bAlt); 5LhFD
DDX_Check(pDX, IDC_SHIFT, m_bShift); >T.U\,om7
DDX_Text(pDX, IDC_PATH, m_Path); 2 'xT%
DDX_Text(pDX, IDC_NUMBER, m_Number); )oG_x{
//}}AFX_DATA_MAP :2 ?dl:l
} eXnMS!g%Z
RFDwL~-p
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n0@e%=H)I
//{{AFX_MSG_MAP(CCaptureDlg) $>OWGueq64
ON_WM_SYSCOMMAND() DB:Ia5|*i
ON_WM_PAINT() -}9ZZ#K
ON_WM_QUERYDRAGICON() r@"Vbq%
ON_BN_CLICKED(ID_ABOUT, OnAbout) oO$a4|&,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6T"[M
ON_BN_CLICKED(ID_CHANGE, OnChange) B2
Tp;)
//}}AFX_MSG_MAP P
et0yH
END_MESSAGE_MAP() zvdtP'&uj
`t{aN|3V[
BOOL CCaptureDlg::OnInitDialog() `WC~cb\
{ 7tUl$H;I/R
CDialog::OnInitDialog(); 6Ei>VcN4a
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 53=s'DZ
ASSERT(IDM_ABOUTBOX < 0xF000); syv6" 2Z'B
CMenu* pSysMenu = GetSystemMenu(FALSE); u <%,Ql
if (pSysMenu != NULL) Ca*^U-
{ {#zJx(2yG
CString strAboutMenu; ]5YG*sD4
strAboutMenu.LoadString(IDS_ABOUTBOX); bxc#bl3
if (!strAboutMenu.IsEmpty()) 1}QU\N(t
{ r_-iOxt~5
pSysMenu->AppendMenu(MF_SEPARATOR); W _yVVr
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); EbY%:jR
} o\g",O4-
} $0AN5 |`g\
SetIcon(m_hIcon, TRUE); // Set big icon S3P;@Rm
SetIcon(m_hIcon, FALSE); // Set small icon zK}$W73W^
m_Key.SetCurSel(0); !HY+6!hk
RegisterHotkey(); <S6|$7{1
CMenu* pMenu=GetSystemMenu(FALSE); (YGJw?]
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |TkMrj0
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D5]T.8kX(7
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O6YYOmt3
return TRUE; // return TRUE unless you set the focus to a control .?<,J
} <lB^>Hfu
oZmni9*SD
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ORA+>
{ @L=xY[&{
if ((nID & 0xFFF0) == IDM_ABOUTBOX) _Sosw|A
{ P,j)m\|
CAboutDlg dlgAbout; [L{q
dlgAbout.DoModal(); @2L+"=u#
} m.&z:`x[
else 3EI$tP @4
{ wg<DV!GZ
CDialog::OnSysCommand(nID, lParam); R}#?A%,*
} 3(}W=oI
} `(q+@ #)
wZ0$ylEX
void CCaptureDlg::OnPaint() #:v|/2
{ (m|p|rL
if (IsIconic()) "/(J*)%{
{ |/Ggsfmby
CPaintDC dc(this); // device context for painting (VI4kRj
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); * A@~!@XE4
// Center icon in client rectangle }{n[_:[7
int cxIcon = GetSystemMetrics(SM_CXICON); <JuP+\JAm
int cyIcon = GetSystemMetrics(SM_CYICON); ,l_"%xYx
CRect rect; X) owj7U;
GetClientRect(&rect); l7Zqk GG]
int x = (rect.Width() - cxIcon + 1) / 2; 'Wn'BRXq3
int y = (rect.Height() - cyIcon + 1) / 2; AcwLs%'sx
// Draw the icon f2`[skNj
dc.DrawIcon(x, y, m_hIcon); dli?/U@hO
} _Q t
else VWj]X7v
{ lSPQXu*[
CDialog::OnPaint(); [GyW1-p33w
} -S"YEH9
} ,_!pUal
}:])1!a
HCURSOR CCaptureDlg::OnQueryDragIcon() ;/XWX$G@
{ "@xI
return (HCURSOR) m_hIcon;
X/}kNW!q
} r,cV(
z{wJQZ9"
void CCaptureDlg::OnCancel() Nz'fM daX,
{ pi*cO
if(bTray) pV9$Vg?-H
DeleteIcon(); `+CRUdr
CDialog::OnCancel(); B36_OH
} NoB)tAvw
jL8.*pfv
void CCaptureDlg::OnAbout() 2`9e20
{ 7v]>ID
CAboutDlg dlg; 5V':3o;D__
dlg.DoModal(); ,6=j'j1#a
} M2W4 RovfR
z\]]d?d?;
void CCaptureDlg::OnBrowse() 66(|3D X
{ G|H+
,B
CString str; --6C>iY[&u
BROWSEINFO bi; SP?~i@H
char name[MAX_PATH]; x"9`w42\r
ZeroMemory(&bi,sizeof(BROWSEINFO)); 93Kd7x-3
bi.hwndOwner=GetSafeHwnd(); $Ypt
/`
bi.pszDisplayName=name; A(V,qw8
bi.lpszTitle="Select folder"; n`8BE9h^
bi.ulFlags=BIF_RETURNONLYFSDIRS; LUc!a4i"fO
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Za_w@o
if(idl==NULL) _ I"}3*
return;
e{EKM4
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ++w7jVi9
str.ReleaseBuffer(); RZoSP(6
m_Path=str; aZn]8jC%
if(str.GetAt(str.GetLength()-1)!='\\') K~$A2b95
m_Path+="\\"; hfE5[
UpdateData(FALSE); 8s16yuM
} BpBMFEiP
~_6~Fi
void CCaptureDlg::SaveBmp() cc- liY"
{ />Kd w
CDC dc; 6hp>w{+
dc.CreateDC("DISPLAY",NULL,NULL,NULL); O_OgTa
CBitmap bm; p{X?_ F
int Width=GetSystemMetrics(SM_CXSCREEN); :%7y6V*
int Height=GetSystemMetrics(SM_CYSCREEN); \e+h">`WgX
bm.CreateCompatibleBitmap(&dc,Width,Height); o 9\J
vJk
CDC tdc; ?*cr|G$r[
tdc.CreateCompatibleDC(&dc); v+Mi"ZAd
CBitmap*pOld=tdc.SelectObject(&bm); hGh91c;4
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); l7 Pn5c
tdc.SelectObject(pOld); 1[p6v4qO{
BITMAP btm; Nk?eVJ)
bm.GetBitmap(&btm); sB`.G
DWORD size=btm.bmWidthBytes*btm.bmHeight; 7IkNS
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3w!8PPl
BITMAPINFOHEADER bih; 'tvX.aX2
bih.biBitCount=btm.bmBitsPixel; V1di#i:
bih.biClrImportant=0; o-i9 :AHs
bih.biClrUsed=0; .3>`y L
bih.biCompression=0; iOY: a
bih.biHeight=btm.bmHeight; uJ-Q]yQ
bih.biPlanes=1; A\ARjSdb
bih.biSize=sizeof(BITMAPINFOHEADER); RwKnNIp
bih.biSizeImage=size; >vQ8~*xd
bih.biWidth=btm.bmWidth; .JCd:'-
bih.biXPelsPerMeter=0; L7\V^f%yCm
bih.biYPelsPerMeter=0; Rtpk_ND!
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9U&~H*Hf
static int filecount=0; 42$ pvw<
CString name; f|f)Kys%5
name.Format("pict%04d.bmp",filecount++); W% @r
name=m_Path+name; eF-U
1ZJT
BITMAPFILEHEADER bfh; R&.mNji*
bfh.bfReserved1=bfh.bfReserved2=0; fVf
@Ngvu
bfh.bfType=((WORD)('M'<< 8)|'B'); (;VlK#rnC
bfh.bfSize=54+size; ":@\kw
bfh.bfOffBits=54; ~'1gX`o:
CFile bf; &A}hx\_T
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ B']-4X{SGa
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); fk&>2[^&
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rj}O2~W~4
bf.WriteHuge(lpData,size); >PuQ{T I
bf.Close(); hZ_@U?^
nCount++; :3b.`s(M
} boS=
GlobalFreePtr(lpData); A |u-VXQ
if(nCount==1) H46N!{<;@
m_Number.Format("%d picture captured.",nCount); 6 &Lr/J76
else !,lk>j.V
m_Number.Format("%d pictures captured.",nCount); tNoPpIu
UpdateData(FALSE); H #Hhi<2
} `6y=ky.,
OEw#;l4 C
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Znw3P|>B
{ 7+9o<j@@o
if(pMsg -> message == WM_KEYDOWN) H2lQ(Y+H
{ y%Rq6P=4Q
if(pMsg -> wParam == VK_ESCAPE) &&% oazR=
return TRUE; &NKb},~
if(pMsg -> wParam == VK_RETURN) N C%96gfD
return TRUE; mq}V @H5
} E)%DLZ
return CDialog::PreTranslateMessage(pMsg); `L
LS|S]
} ZyM7)!+kPa
brCXimG&jo
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {oSdVRI
{ nuH=pIq6x
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2##;[
SaveBmp(); `>0%Ha
return FALSE; &@K6;T
} 8eVy*h2:=
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4< +f|(fIA
CMenu pop; WeJ=]7T'L
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Q6T"8K/
CMenu*pMenu=pop.GetSubMenu(0); X1HEeJ|
pMenu->SetDefaultItem(ID_EXITICON); U&i#cF
CPoint pt; V0NLwl
O
GetCursorPos(&pt); 4a0Ud !Qcs
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); i?ZVVE=r
if(id==ID_EXITICON) k%3)J"|/
DeleteIcon(); 9a[1s|>w-
else if(id==ID_EXIT) A9lw^.
OnCancel(); yAAV,?:o[
return FALSE; 3 [j,d]\|
} Atb`Q'Yrw
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n}b{u@$
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) hraR:l
D
AddIcon(); L3w.<h
return res; |sI@m@
} N5{v;~Cm}V
A_l\ij$Y
void CCaptureDlg::AddIcon() vf zC2
{ t{g@z3
NOTIFYICONDATA data; BTD_j&+(
data.cbSize=sizeof(NOTIFYICONDATA); _CPj]m{
CString tip; #K0/ >W
tip.LoadString(IDS_ICONTIP); DXG`% <ZMn
data.hIcon=GetIcon(0); mKjTJzS
data.hWnd=GetSafeHwnd(); #1%ahPhR+
strcpy(data.szTip,tip); w[F})u]E
data.uCallbackMessage=IDM_SHELL; J6[}o4Z
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~;jgl_5?b
data.uID=98; *v%gNq
Shell_NotifyIcon(NIM_ADD,&data); `v@Z|rv,
ShowWindow(SW_HIDE); CuK>1_Dq
bTray=TRUE; qH0JZdk
} ]?)uYot
cpl Ny?UIC
void CCaptureDlg::DeleteIcon() yKuZJXGVo
{ c0Bqm
NOTIFYICONDATA data; KAXjvZN1
data.cbSize=sizeof(NOTIFYICONDATA); @Co6$<
data.hWnd=GetSafeHwnd(); %19~9Tw
data.uID=98; VQ,5&-9Y3
Shell_NotifyIcon(NIM_DELETE,&data); Y#I8gzv
ShowWindow(SW_SHOW); 0ETT@/)]z
SetForegroundWindow(); dH.Fb/7f
ShowWindow(SW_SHOWNORMAL); `k>C%6FG$#
bTray=FALSE; Op8Gj
`
} p+<qI~
Y[vP]7-
void CCaptureDlg::OnChange() X3 1%T"
{ jJw
RegisterHotkey(); cLp_\\
} 2q]ZI
[L7s(Zs>
BOOL CCaptureDlg::RegisterHotkey() \BH?GMoP
{ 8\9W:D@"x
UpdateData(); kP}l"CN4
UCHAR mask=0; 50|nQ:u,
UCHAR key=0; 5x|$q kI
if(m_bControl) wl%ysM|x
mask|=4; ;hODzfNkS
if(m_bAlt) k>Fw2!mA^
mask|=2; I
L7kpH+y
if(m_bShift) 7[='m{{=C
mask|=1; :R
+BC2x
key=Key_Table[m_Key.GetCurSel()]; *g
%bdO
if(bRegistered){ TghT{h@
DeleteHotkey(GetSafeHwnd(),cKey,cMask); *~4<CP+"0
bRegistered=FALSE;
#tpz74O
} !SE
cMask=mask; @aN~97
H\
cKey=key; -O,:~a=*_
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6HJsIeQ
return bRegistered; o3\^9-jmp
} R\X;`ptT
mXhC-8P
四、小结 `Ix`/k}
7)1%Z{Dy
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。