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:
eT8h:+k
*y W9-( 一、实现方法
+R31YR8C0 ZaFqGcS~ 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:
_3gF~qr dW#l3_'3T #pragma data_seg("shareddata")
y{nX 6 HHOOK hHook =NULL; //钩子句柄
HGW;] 8xl UINT nHookCount =0; //挂接的程序数目
{dV!sQD static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
{1GIiP-U static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
"~IGE3{ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
";59,\6
static int KeyCount =0;
u?8e>a static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
]8opI\ #pragma data_seg()
-} +PE 4fh lpefOnO[ 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。
D&8*4> >Wj8[9zf 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:
bvo
}b-]E cp+eh BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
@'S !G"\ cKey,UCHAR cMask)
}$s._)a {
r}t%DH BOOL bAdded=FALSE;
uC1v^!D for(int index=0;index<MAX_KEY;index++){
Y FW0 if(hCallWnd[index]==0){
%W$?*Tm hCallWnd[index]=hWnd;
?^:
xNRE$j HotKey[index]=cKey;
1;+(HB HotKeyMask[index]=cMask;
q5~fU$ , bAdded=TRUE;
ivi&; KeyCount++;
{7FD-Q[tS break;
R<1[hH9"o }
=+wkjTO }
p5=VGKp return bAdded;
eadY(-4|I- }
5W?r04 //删除热键
+'?axv6e BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%MN>b[z
{
fehM{)x2: BOOL bRemoved=FALSE;
2 lBu"R 6} for(int index=0;index<MAX_KEY;index++){
rjT!S1Hs if(hCallWnd[index]==hWnd){
4_?*@L1 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
j'FBt8P' hCallWnd[index]=NULL;
TM$`J HotKey[index]=0;
6.GIUM%D HotKeyMask[index]=0;
!rgdOlTR ^ bRemoved=TRUE;
m2Q#ATLW KeyCount--;
,vUMy&AV break;
ed7Hz#Qc }
qL68/7:A }
-o0~xspF }
{-\VX2:;[9 return bRemoved;
)`]} D[j }
TWgI-xB "@E(}z'sM |;P9S DLL中的钩子函数如下:
?QCHkhU Y<-dd"\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
||k^pzj% {
]#x?[F BOOL bProcessed=FALSE;
B(dq$+4 if(HC_ACTION==nCode)
LP:C9Ol\ {
!/MHD if((lParam&0xc0000000)==0xc0000000){// 有键松开
FA;uu\ switch(wParam)
lO0 PZnW9 {
-|xyj2M case VK_MENU:
g4*]R>f MaskBits&=~ALTBIT;
20H$9M=} break;
Flzl,3rW4 case VK_CONTROL:
*a4nd_! MaskBits&=~CTRLBIT;
Y$?<y break;
S[cVoV case VK_SHIFT:
c)fTI,.$ MaskBits&=~SHIFTBIT;
?I.<mdhN#t break;
geu8$^ default: //judge the key and send message
q#N8IUN}4 break;
ro4 XA1 }
KBo/GBD]| for(int index=0;index<MAX_KEY;index++){
nr<&j#!L if(hCallWnd[index]==NULL)
NI136P continue;
hE>i~:~R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r$~
f[cA {
<ib#PLRM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Ym*Ed[S bProcessed=TRUE;
u%=M4|7 }
M&iA^Wrs }
G#;$; }
ZO $}m? else if((lParam&0xc000ffff)==1){ //有键按下
d`;_~{sleR switch(wParam)
{'#^ {
ISuye2tExq case VK_MENU:
+9mnxU> MaskBits|=ALTBIT;
64OgE! break;
Vee`q. case VK_CONTROL:
D=nuK25 MaskBits|=CTRLBIT;
7$7Y)&\5w break;
[/ E_v gZ case VK_SHIFT:
wDV%.Cc MaskBits|=SHIFTBIT;
w;(`!^xv break;
qwU,D6 default: //judge the key and send message
agFWye break;
D'Gmua]I }
7uQ-:n for(int index=0;index<MAX_KEY;index++){
NK+iLXC if(hCallWnd[index]==NULL)
j6KGri continue;
,IW$XD if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cO"7wgg {
;Qc_Tf=, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
NQ@."8 bProcessed=TRUE;
T)ra>r<# }
J34lu{'if }
vH+QI }
J!o[/`4ib if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
b_]14 v for(int index=0;index<MAX_KEY;index++){
l1\/ ` if(hCallWnd[index]==NULL)
$b/oiy!=|3 continue;
^MesP:[2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
bb6J$NR SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%<q l //lParam的意义可看MSDN中WM_KEYDOWN部分
gekW&tRie }
b"y][5VE }
0'm4
)\ }
ajayj|h return CallNextHookEx( hHook, nCode, wParam, lParam );
47xJ(yO }
~'e/lX9g- gNO<`9q 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:
0FFx E{*~>#+ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
YN
~7 nOw BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
k4+F >*v^E9Y 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:
s:UQ~p}"S V Z[[zYe LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
uJ4RjLM` {
99}n%(V if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
f_r1(o5:Y {
37 wm[Z //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Z;aQ/n[` SaveBmp();
5Y
4W:S return FALSE;
I%43rdoPe }
tdn[]|= …… //其它处理及默认处理
^<R*7mB* }
!+4}x;!8 _W4i?Bde \$2E 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。
ki#O ^vl gg(^:`+ 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。
w<<G}4~u| z6vRTY 二、编程步骤
Eoug/we ;K[`o/#4" 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";
MX 2UYZ& 'Lft\.C 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
EnJAHgRV;e jZcjiOX 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;
g_}r)CgG| `Njv#K} U 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;
!Jw Af:4 XSO6 5、 添加代码,编译运行程序。
!Re/W
ykY ,>n 4
`A 三、程序代码
N0h"EV[ q#-szZQ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
\.A~>=: #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
R/M:~h~F! #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ur-&- G^ #if _MSC_VER > 1000
yf! #pragma once
@4m_\]Wy #endif // _MSC_VER > 1000
nJF"[w, ? #ifndef __AFXWIN_H__
:2?J#/o #error include 'stdafx.h' before including this file for PCH
inavi5. #endif
v6
DN:!& #include "resource.h" // main symbols
Rx*T7*xg{ class CHookApp : public CWinApp
L=Q-r[ {
9}Tf9>qP>M public:
'2a }1? CHookApp();
t$8f:*6(* // Overrides
_cx}e!BK# // ClassWizard generated virtual function overrides
'+NmHu:q //{{AFX_VIRTUAL(CHookApp)
v9Oyboh(y public:
4^VY virtual BOOL InitInstance();
;8;nY6Ie virtual int ExitInstance();
g6$X { //}}AFX_VIRTUAL
*plsZ*Q8 //{{AFX_MSG(CHookApp)
BclZsU=xn // NOTE - the ClassWizard will add and remove member functions here.
E27wxMU // DO NOT EDIT what you see in these blocks of generated code !
8w~I(2S:# //}}AFX_MSG
~zFs/(k DECLARE_MESSAGE_MAP()
!'Xk=+ };
YMwMaU)K, LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
OC9_EP\" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
!SIGzj BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
|]~tX zY BOOL InitHotkey();
A"k6n\!n; BOOL UnInit();
Aj.TX%}`h #endif
nbMnqkNb g>x2[//pk //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
H1f){L97wR #include "stdafx.h"
/] ce?PPC #include "hook.h"
_CPe #include <windowsx.h>
{Q?AIp6u| #ifdef _DEBUG
za'Eom-<u #define new DEBUG_NEW
7rc^-!k #undef THIS_FILE
D{h1"q static char THIS_FILE[] = __FILE__;
)H#Hs<)Qy #endif
[[QrGJr #define MAX_KEY 100
_wKFT> #define CTRLBIT 0x04
[kgT"?w= #define ALTBIT 0x02
Q <EFd #define SHIFTBIT 0x01
(F]f{8 #pragma data_seg("shareddata")
/s(/6~D| HHOOK hHook =NULL;
ox] LlR K UINT nHookCount =0;
|uQJMf[L) static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
D,d mlv static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
s
d>&6R^ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
kg7oH.0E static int KeyCount =0;
\&]'GsfF static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
KP[ax2!x #pragma data_seg()
m;lwMrY\7> HINSTANCE hins;
U;:>vi3p void VerifyWindow();
07Yh BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
{QTfD~z^K //{{AFX_MSG_MAP(CHookApp)
^Qrdh0j // NOTE - the ClassWizard will add and remove mapping macros here.
*nluK // DO NOT EDIT what you see in these blocks of generated code!
x
SF#ys4v //}}AFX_MSG_MAP
eP|:b & END_MESSAGE_MAP()
FD*`$.e3\ >IC.Zt@ CHookApp::CHookApp()
*j2P#et {
S&8gZ~B // TODO: add construction code here,
+?[TH?2c+ // Place all significant initialization in InitInstance
xaX3<V@S }
tXcc#!'4C (ta!4h, CHookApp theApp;
,<%Y.x%4z[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
`#A&v {
3zp)!QJi BOOL bProcessed=FALSE;
K!"[,=u_ if(HC_ACTION==nCode)
b-ULoV {
X3#|9 if((lParam&0xc0000000)==0xc0000000){// Key up
1j# ~:=I switch(wParam)
Lg[*P8wE {
..3TB=Z# case VK_MENU:
#IA[erf: MaskBits&=~ALTBIT;
CtV$lXxup break;
^.&uYF& case VK_CONTROL:
uO>$,s MaskBits&=~CTRLBIT;
C[gCwDwl break;
2[LT!TT case VK_SHIFT:
[#$ -kd~ MaskBits&=~SHIFTBIT;
THWT\3~, break;
=|bM|8, default: //judge the key and send message
1`r
4 break;
[Pi8gj* }
W`^'hka for(int index=0;index<MAX_KEY;index++){
?ah-x""Y if(hCallWnd[index]==NULL)
u1/4WYJeJ continue;
D)8&v`LS if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a9mLPP {
I1BVqIt1i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*L%HH@] %_ bProcessed=TRUE;
F(^vD_G }
oqB(l[%z2 }
JGX E{FT }
_W/s=pCh else if((lParam&0xc000ffff)==1){ //Key down
DbP!wU lqR switch(wParam)
mEv<r6qDT {
VmHok case VK_MENU:
m,,-rC MaskBits|=ALTBIT;
|3/=dG break;
YH&`+ + case VK_CONTROL:
f%` =>l MaskBits|=CTRLBIT;
b/5?)!I break;
j1*'yvGM case VK_SHIFT:
k q8:h MaskBits|=SHIFTBIT;
$IA(QC_]AO break;
Oj\lg2Ck
default: //judge the key and send message
HhhN8t break;
D' ZR>@w@ }
hU3c;6]3 for(int index=0;index<MAX_KEY;index++)
L&MR%5 {
WW\u}z.QJ if(hCallWnd[index]==NULL)
C$SuFL(pb continue;
g2JNa?z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[U]U *x {
\Pi\c~)Pr SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9Iq [@v bProcessed=TRUE;
*r@7 :a5 }
#Gx%PQ` }
QxH%4 )? }
R22YKXU if(!bProcessed){
7/a[;`i*! for(int index=0;index<MAX_KEY;index++){
S3EY9:^C if(hCallWnd[index]==NULL)
" JFx continue;
P {i\x# if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!'w h hi SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
D)U
9xA)J }
c [sydl }
UBzX%:A }
Z,)4(#b = return CallNextHookEx( hHook, nCode, wParam, lParam );
jOa .h }
^=.R#zrc D+P( BOOL InitHotkey()
F{0Z {
BaZ$p O^ if(hHook!=NULL){
x^Q:U1 nHookCount++;
P}29wr IZ return TRUE;
bGOOC?[UX }
/W1!mih else
t6m3lq{ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
?1*Ka if(hHook!=NULL)
0_q8t!<xJw nHookCount++;
y^zII5|s return (hHook!=NULL);
=e](eA; }
h:-ZXIv? BOOL UnInit()
QMLz {
1"YN{Ut;G if(nHookCount>1){
n/6#rj^$ nHookCount--;
NY
756B*
return TRUE;
Y<-h#_ }
FeoI+KA BOOL unhooked = UnhookWindowsHookEx(hHook);
jj_z#6{ if(unhooked==TRUE){
gI "ZhYI nHookCount=0;
4l7TrCB hHook=NULL;
bc=,$ }
:7UC=GKQk return unhooked;
\@;$xdA$ }
\(2w/~ (hNTr(z BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`-fWNHs {
Y[)b".K BOOL bAdded=FALSE;
[~*5uSG for(int index=0;index<MAX_KEY;index++){
1AQVj]#S if(hCallWnd[index]==0){
qmqWMLfC hCallWnd[index]=hWnd;
5xC4lT/U HotKey[index]=cKey;
WfpQ HotKeyMask[index]=cMask;
uNCM,J!#~ bAdded=TRUE;
/4/'&tY KeyCount++;
.DsdQ4Y break;
1/+d@s#t }
~k\Dde }
}A jE- K{ return bAdded;
vz5x{W }
vF@hg)A Wip@MGtJ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E! d?@Xr@ {
q\s"B.(G" BOOL bRemoved=FALSE;
2 j.6 for(int index=0;index<MAX_KEY;index++){
2t 6m# if(hCallWnd[index]==hWnd){
DmU,}]#: if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>RJjm&M hCallWnd[index]=NULL;
7irpD7P>
HotKey[index]=0;
-fpe HotKeyMask[index]=0;
WoM;) Q bRemoved=TRUE;
-]el_:H KeyCount--;
E|{(O break;
%"-bG'Yc }
<G|i!Pm }
j5m KJC }
!q\MXS($#u return bRemoved;
fwQVx Je }
YBh|\ )U12Rshl void VerifyWindow()
>[}lC7 z, {
R !g'zS' for(int i=0;i<MAX_KEY;i++){
GWFF.Mo^ if(hCallWnd
!=NULL){ yq. <,b=87
if(!IsWindow(hCallWnd)){ f~Y;ZvB
hCallWnd=NULL; 4`yE'%6.}
HotKey=0; mi[t1cN)=
HotKeyMask=0; OT0%p)
KeyCount--; ]1hyv m3
} /pY-how%!
} GDF/0-/Z
} aeZ$Wu>]W
} ')N[)&&Q{
1WjNF i
BOOL CHookApp::InitInstance() @k=UB&?I
{ 0JFS%Yjw[
AFX_MANAGE_STATE(AfxGetStaticModuleState()); "s-3226kj
hins=AfxGetInstanceHandle(); y0vJ@ %`
InitHotkey(); 6/Iq@BZ&
return CWinApp::InitInstance(); v[;R(pt?
} )
>;7"v
^'9.VVyz
int CHookApp::ExitInstance() .RNY}bbk
{ lfvt9!SJ+/
VerifyWindow(); :HW| mqKd
UnInit(); Y5c,O>T5Y
return CWinApp::ExitInstance(); WwsH7X)
} >|X )
Q":,oZ2
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /< k&[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :@uIEvD?
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (1EtC{
m
#if _MSC_VER > 1000 6VUs:iO1j5
#pragma once KH$|wv
#endif // _MSC_VER > 1000 s&hJ[$i
E1r-$gf_
class CCaptureDlg : public CDialog }7non
{ b5Q|$E
// Construction O&dBLh!G
public: {FQ@eeU
BOOL bTray; @E 8P>kq
BOOL bRegistered; @An}
BOOL RegisterHotkey(); 0=0,ix7?#
UCHAR cKey; \sMe2OL#z
UCHAR cMask; *\.8*6*$!
void DeleteIcon(); H )51J:4
void AddIcon(); Y5CDdn
UINT nCount; XGuxd
void SaveBmp(); +0}z3T1L
CCaptureDlg(CWnd* pParent = NULL); // standard constructor SR$ 'JGfp
// Dialog Data p}oGhO&=
//{{AFX_DATA(CCaptureDlg) [rkw k\m*
enum { IDD = IDD_CAPTURE_DIALOG }; !4-4i
CComboBox m_Key; @)\4 $#+-
BOOL m_bControl;
|nCVM\+5T
BOOL m_bAlt; 80zpRU"
BOOL m_bShift; #x qiGK
CString m_Path; ]_BH"ng}
CString m_Number; iYZn`OAx
//}}AFX_DATA _9g-D9
// ClassWizard generated virtual function overrides O8OAXRt/Y
//{{AFX_VIRTUAL(CCaptureDlg) (xfh 9=.
public: ;FQNO:NP
virtual BOOL PreTranslateMessage(MSG* pMsg); NbC2N)L4
protected: KomMzG:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?K+q~DzNSD
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f8
BZk h
//}}AFX_VIRTUAL ZNVrja*
// Implementation a^={X<K|/
protected: M8Vc5
HICON m_hIcon; *`}
!{
Mb
// Generated message map functions c/Fgx/hr
//{{AFX_MSG(CCaptureDlg) MuJP.]5>`
virtual BOOL OnInitDialog(); qA;Gl"HF
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &wAVO_s
afx_msg void OnPaint(); l?QA;9_R'
afx_msg HCURSOR OnQueryDragIcon(); 2eHVl.C5
virtual void OnCancel(); qu1+.z=|
afx_msg void OnAbout(); =z;]FauR!
afx_msg void OnBrowse(); RL:B.Lv/W
afx_msg void OnChange(); O6/:J#X%
//}}AFX_MSG ;yajt\a
DECLARE_MESSAGE_MAP() oYdE s&qq
}; &?1O D5
#endif ^2H;
dB6['z)2
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,PmUl=
#include "stdafx.h" Nc&J%a
#include "Capture.h" %3O))Ug5
#include "CaptureDlg.h" J%-4ZB"
#include <windowsx.h> {G0=A~
#pragma comment(lib,"hook.lib") c<, LE@V
#ifdef _DEBUG %&_^I*
#define new DEBUG_NEW !zvjgDlZv
#undef THIS_FILE PtYG%/s
static char THIS_FILE[] = __FILE__; IITUM)
#endif 41R6V>e@9J
#define IDM_SHELL WM_USER+1 ,jEc4ih4
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HCsd$M;Hbv
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5x%Blkx
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 51JB,}dGH}
class CAboutDlg : public CDialog &8w#
4*W
{ PW|=IPS
public: ~Th,<w*o
CAboutDlg(); Q^ZM| (s#
// Dialog Data ]Zt ]wnL+
//{{AFX_DATA(CAboutDlg) Q5ff&CE
enum { IDD = IDD_ABOUTBOX }; I 1n,c d[
//}}AFX_DATA (BFwE@1"
// ClassWizard generated virtual function overrides ~;?<OOt|wG
//{{AFX_VIRTUAL(CAboutDlg) tu Y+n2
protected: }% f7O
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0
zK{)HZ
//}}AFX_VIRTUAL [zBi*%5O
// Implementation O^3kPVr
protected: ]+46r!r|
//{{AFX_MSG(CAboutDlg) (:qc[,m
//}}AFX_MSG 9@ YKx0
DECLARE_MESSAGE_MAP() zBlv?JwG
}; Cdib{y<ji
6F!B*lr
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (M"rpG>L
{ ,[IDC3.4^R
//{{AFX_DATA_INIT(CAboutDlg) FLs$
//}}AFX_DATA_INIT Gc"hU:m
} E(j#R"
P
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) *<W8j[?
{ S\h5
D2G;
CDialog::DoDataExchange(pDX); v+"4YIN
//{{AFX_DATA_MAP(CAboutDlg) hO&b\#@~
//}}AFX_DATA_MAP CxeW5qc
} `:Gzjngc
JC%&d1
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4MS#`E7LrC
//{{AFX_MSG_MAP(CAboutDlg) s:7/\h
// No message handlers h Fik>B#!
//}}AFX_MSG_MAP Hc=QSP
END_MESSAGE_MAP() 9M;t4Um
ZaU8eg7
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >>
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: CDialog(CCaptureDlg::IDD, pParent) \?>M?6D
{ IC&P-X_aP
//{{AFX_DATA_INIT(CCaptureDlg) ^e_LnJ+
m_bControl = FALSE; chKK9SC+|
m_bAlt = FALSE; / n_s"[I4
m_bShift = FALSE; -z~!%4 a
m_Path = _T("c:\\"); Ac|\~w[\
m_Number = _T("0 picture captured."); iW^J>aKy
nCount=0; dgF%&*Il]O
bRegistered=FALSE; S@qR~_>a
bTray=FALSE; E I zy
//}}AFX_DATA_INIT VJqk0w+
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]vlBYAW'
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ey=KA t
} X0u,QSt'O
q50F!yHC-
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2^=.j2
{ z'"7zLQ
CDialog::DoDataExchange(pDX); qEr?4h
//{{AFX_DATA_MAP(CCaptureDlg) \O;2^
DDX_Control(pDX, IDC_KEY, m_Key); `,-mXxTNT
DDX_Check(pDX, IDC_CONTROL, m_bControl); VwE4:/7YN
DDX_Check(pDX, IDC_ALT, m_bAlt); HKXC=^}x'
DDX_Check(pDX, IDC_SHIFT, m_bShift); D<;~eZ'
DDX_Text(pDX, IDC_PATH, m_Path); <;S$4tux
DDX_Text(pDX, IDC_NUMBER, m_Number); ![^pAEgx
//}}AFX_DATA_MAP YND }P9 h
} )Q'E^[Ua
g w([08
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) A,9JbX
//{{AFX_MSG_MAP(CCaptureDlg) |MFAP!rycS
ON_WM_SYSCOMMAND() Sy|GM~
ON_WM_PAINT() 4MzQH-U>/
ON_WM_QUERYDRAGICON() dHUbaf:e)T
ON_BN_CLICKED(ID_ABOUT, OnAbout) Ctz#9[|
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) m+hI3@j
ON_BN_CLICKED(ID_CHANGE, OnChange) k?14'X*7yu
//}}AFX_MSG_MAP n(J>'Z
END_MESSAGE_MAP() RyJy%|\-S
*z?Uh$I4
BOOL CCaptureDlg::OnInitDialog() 3$nK
{ ^obuMQ;
CDialog::OnInitDialog(); 9p qsr~
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Bi:lC5d5?
ASSERT(IDM_ABOUTBOX < 0xF000); din,yHu~
CMenu* pSysMenu = GetSystemMenu(FALSE); Bzrnmz5S
if (pSysMenu != NULL) Wr%ov6:
{ f\<r1
CString strAboutMenu; Ev5~= ]
strAboutMenu.LoadString(IDS_ABOUTBOX); !k)6r6
if (!strAboutMenu.IsEmpty()) yov~'S9
{ ^
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pSysMenu->AppendMenu(MF_SEPARATOR); F'Y ad
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cRVL1ne
} . ,^WCyvq
} y4Jc|)
SetIcon(m_hIcon, TRUE); // Set big icon I_ mus<sE
SetIcon(m_hIcon, FALSE); // Set small icon IC0L&;En
m_Key.SetCurSel(0); dT|f<E/P
RegisterHotkey(); CaJ-oy8
CMenu* pMenu=GetSystemMenu(FALSE); P35DVK S
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Dcvul4Q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tk%f_"}
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `FMo;,j
return TRUE; // return TRUE unless you set the focus to a control m}uOBR+
} b&U1^{(
'`P%;/z
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Y[6T7eZ0g
{ J,yKO(}<C
if ((nID & 0xFFF0) == IDM_ABOUTBOX) (`.OS)&
{ XP@dg4Z=z
CAboutDlg dlgAbout; ,Z@#( =f
dlgAbout.DoModal(); ( 2HM"Pd
} 4k;FZo]S
else f8]sjeY
{ #{8IFA
CDialog::OnSysCommand(nID, lParam); i)o;,~ee
} EL?(D
} " CT}34l
N-M.O:p
void CCaptureDlg::OnPaint() Tn}`VW~
{ 6h;(b2p{
if (IsIconic()) 8)X9abC
{ c* {6T}VZr
CPaintDC dc(this); // device context for painting DXiA4ihr=
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); KNx/1lf
// Center icon in client rectangle m^D'p
int cxIcon = GetSystemMetrics(SM_CXICON); DXLXGvcM
int cyIcon = GetSystemMetrics(SM_CYICON); :<qe2Z5k
CRect rect; *,\"}x*
GetClientRect(&rect); @V%\Gspv
int x = (rect.Width() - cxIcon + 1) / 2; >!=@TK(~
int y = (rect.Height() - cyIcon + 1) / 2; c@t?R$c
// Draw the icon Ga7E}y%
dc.DrawIcon(x, y, m_hIcon); >|QH
I
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} OIrm9D#
else f$o^Xu
{ Sa= tiOv
CDialog::OnPaint(); N(&{~*YE
} f^$,;
} Hf`i~6
GJ,&$@8)
HCURSOR CCaptureDlg::OnQueryDragIcon() $o[-xNn1
{ J/je/PC
return (HCURSOR) m_hIcon; &h334N|4{
} hQn?qJy%W
<~smBd
void CCaptureDlg::OnCancel() p;+O/'/j
{ N[I@}j
if(bTray) kTb$lLG\xk
DeleteIcon(); UBaXS_c\
CDialog::OnCancel(); ]RCo@QW
} GE/!$3
*
65/gG8>
void CCaptureDlg::OnAbout() .@VZ3"
{ !mNst$-H4
CAboutDlg dlg; 24jf`1XFW
dlg.DoModal(); Mn0.!J
"
} 8rsc@]W
pbVL|\oB}
void CCaptureDlg::OnBrowse() VgHO&vU
{ 'c35%?]
CString str; k~>(XG[x&
BROWSEINFO bi; C%o|}i v"
char name[MAX_PATH]; mU/o%|h
ZeroMemory(&bi,sizeof(BROWSEINFO)); -zg*p&F
bi.hwndOwner=GetSafeHwnd(); /Y0~BQC7!
bi.pszDisplayName=name; >. |({;n9
bi.lpszTitle="Select folder"; ?:;;0kSk
bi.ulFlags=BIF_RETURNONLYFSDIRS; b RR N
LPITEMIDLIST idl=SHBrowseForFolder(&bi); UQl?_[G
if(idl==NULL) @Q74
return; *S;}&VAZ
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 7>yd
str.ReleaseBuffer(); @>8(f#S%
m_Path=str; 'UhoKb_p
if(str.GetAt(str.GetLength()-1)!='\\') YdhTjvx
m_Path+="\\"; k~tEUsv
UpdateData(FALSE); 4Q|>k)H
} <o(;~
t<!m4Yd|#
void CCaptureDlg::SaveBmp() fd)8lK[KJ"
{ R]"Zv'M(AM
CDC dc; qed_ PsI
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7
Lm9I
CBitmap bm; :5k* kx#y
int Width=GetSystemMetrics(SM_CXSCREEN); q[$>\Nfg>B
int Height=GetSystemMetrics(SM_CYSCREEN); ytcLx77`:
bm.CreateCompatibleBitmap(&dc,Width,Height); <XeDJ8
'
CDC tdc; N^;lp<{6?
tdc.CreateCompatibleDC(&dc); HWjJ.;k}a
CBitmap*pOld=tdc.SelectObject(&bm); ^z
*0
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !<w6j-S
tdc.SelectObject(pOld); S@qPf0dL<
BITMAP btm; K"!rj.Da
bm.GetBitmap(&btm); &f.5:u%{b
DWORD size=btm.bmWidthBytes*btm.bmHeight; F-;J N
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O/~T+T%
BITMAPINFOHEADER bih; FQWjL>NB
bih.biBitCount=btm.bmBitsPixel; UFB|IeX?q
bih.biClrImportant=0; YgEd%Z%4
bih.biClrUsed=0; /~"-q
bih.biCompression=0; .eJKIck
bih.biHeight=btm.bmHeight; Vl5r~+$|
bih.biPlanes=1; %KyZ15_(-L
bih.biSize=sizeof(BITMAPINFOHEADER); %xgP*%Sv2
bih.biSizeImage=size; .O-)m'5
bih.biWidth=btm.bmWidth; 5Q10Ohh
bih.biXPelsPerMeter=0; ZX_QnSNZ?
bih.biYPelsPerMeter=0; v^C\
GDH
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3p#UEH3
static int filecount=0; LK h=jB^bT
CString name; ktU:Uq
name.Format("pict%04d.bmp",filecount++); ) 57'<
name=m_Path+name; x^y$ pr
BITMAPFILEHEADER bfh; khX/xL
bfh.bfReserved1=bfh.bfReserved2=0; st w@@GQ
bfh.bfType=((WORD)('M'<< 8)|'B'); 0}i
9`p
bfh.bfSize=54+size; lU1SN/'zx
bfh.bfOffBits=54; e@hPb$7
CFile bf; :DH@zR
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ `gl?y;xC
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !&U75FpN}:
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <$nPGz)}
bf.WriteHuge(lpData,size); Q=Q+*oog
bf.Close(); d!I%AlV
nCount++; `q}D#0
} ]@U?hD
GlobalFreePtr(lpData); SqAz((
if(nCount==1) nDkG}JkB!
m_Number.Format("%d picture captured.",nCount); (Q{JI~P
else e{8C0=
m_Number.Format("%d pictures captured.",nCount); V
FM[-
UpdateData(FALSE); I gJu/{:y^
} o#FctM'Z
#hBqgG:>
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #c|l|Xvq2
{ LNL}R[1(
if(pMsg -> message == WM_KEYDOWN) ir^d7CV,
{ 'bfxQ76@sa
if(pMsg -> wParam == VK_ESCAPE) m0G"Aj
return TRUE; xbiprhdv
if(pMsg -> wParam == VK_RETURN) ?"b __(3
return TRUE; >Iij,J5i
} v8-szW).
return CDialog::PreTranslateMessage(pMsg); UB@(r86d
} J.~@j;[2
}Z <I%GT
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1^k}GXsWmE
{ l<_v3/3
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !+$qSD,%x
SaveBmp(); hx^@aI
return FALSE; #o&T$D5
} P.(UbF d'
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pr>$m{
Z
CMenu pop; m#h`iW
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $I5|rB/4?
CMenu*pMenu=pop.GetSubMenu(0); &Hw:65O
pMenu->SetDefaultItem(ID_EXITICON); ^aaj=p:cV
CPoint pt;
4H;g"nWqO
GetCursorPos(&pt); `_ ^I 2
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P#pb48^-
if(id==ID_EXITICON) ^(Gl$GC$Mu
DeleteIcon(); -Ua5anzB
else if(id==ID_EXIT) WDNj7
OnCancel(); fTmJDUv+
return FALSE; T:j41`g%s
} |TJ gH<I
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [?z;'O}y
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ['(qeS@5O
AddIcon(); E.#JCO|(1
return res; 1mV
'
~W
} X'd\b}Bm
D*L@I@
[
void CCaptureDlg::AddIcon() nR%w5oe
{ ?r;F'%N=
NOTIFYICONDATA data; K*~xy bA
data.cbSize=sizeof(NOTIFYICONDATA); 8\il~IFyi
CString tip; 8?~>FLWTXZ
tip.LoadString(IDS_ICONTIP); SP0ueAa}
data.hIcon=GetIcon(0); ^C,rN;mX'
data.hWnd=GetSafeHwnd(); FUI/ A>
strcpy(data.szTip,tip); Q8TR@0d
data.uCallbackMessage=IDM_SHELL; ruhC:rg:/
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Fkv284,LM
data.uID=98; W&A^.% 2l
Shell_NotifyIcon(NIM_ADD,&data); +fvVora
ShowWindow(SW_HIDE); Njo.-k
bTray=TRUE; L `2{H%J`
} dsEvpa$?
F, =WfM\
void CCaptureDlg::DeleteIcon() xqT} 9,
{ |$8N*7UD
NOTIFYICONDATA data; "+Ks#
data.cbSize=sizeof(NOTIFYICONDATA); Xe}I;sKrB
data.hWnd=GetSafeHwnd(); =
CXX.%N
data.uID=98; 0>Kgz!I
Shell_NotifyIcon(NIM_DELETE,&data); yFo8x[
ShowWindow(SW_SHOW); TGpdl`k\T
SetForegroundWindow(); =)#XZ[#F
ShowWindow(SW_SHOWNORMAL); B"7~[,he
bTray=FALSE; uxW |&q
} $y)tcVc
%PVu>^
void CCaptureDlg::OnChange() y] Q/(O
{ ][f 0ZMa
RegisterHotkey(); J^kSp
} @$b7
eu
BT:b&"AR[
BOOL CCaptureDlg::RegisterHotkey() _J>Ik2EF
{ :>y5'q@R
UpdateData(); 98}l`J=i
UCHAR mask=0; ~LH).\V
UCHAR key=0; @&h_+|:-
if(m_bControl) L#V e[
mask|=4; G$`hPNSh
if(m_bAlt) $9@Z\0
mask|=2; ?:PF;\U
if(m_bShift) %AMF6l[
mask|=1; _=w=!U&W
key=Key_Table[m_Key.GetCurSel()]; d.sn D)X
if(bRegistered){ a/d8_(0
DeleteHotkey(GetSafeHwnd(),cKey,cMask); nQw, /Lk
bRegistered=FALSE; ylmVmHmc
} &WbHM)_n
cMask=mask; UuJ gB)
cKey=key; Dhft[mvo
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2J(,Xf
return bRegistered; m7,"M~\pX
} ]:6IW:
Kt#X'!9/<
四、小结 ,=6;dT
neWx-O
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。