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:
sZH7EK
GWVdNYpmr 一、实现方法
aOHCr>po, p~.@8r( 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:
)1vojp
4Za SRTpE, #pragma data_seg("shareddata")
BQU5[8l HHOOK hHook =NULL; //钩子句柄
zvf]}mNx UINT nHookCount =0; //挂接的程序数目
5);#\&B static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
[86'/:L\2 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
, _$"6 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
<J)A_Kx[57 static int KeyCount =0;
h9I)<_}R static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
is(!_Iv #pragma data_seg()
nnG2z@$- PNKT \yd 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。
pPZ/ O6 $3TTHS o DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
"Y!dn|3
@__;RVQ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
f}X8|GlBo cKey,UCHAR cMask)
j/<y {
r.wIk0 BOOL bAdded=FALSE;
5uV"g5?w for(int index=0;index<MAX_KEY;index++){
"56?/ jF if(hCallWnd[index]==0){
g<iwxF hCallWnd[index]=hWnd;
12d}#G<q- HotKey[index]=cKey;
^?X ^+ HotKeyMask[index]=cMask;
ju^"vw bAdded=TRUE;
}C{}oLz KeyCount++;
;Co[y=Z break;
Ef`5fgp?
S }
"T a9
}
{ 1@4}R4 return bAdded;
c,+(FQ9 }
P\X=* //删除热键
B!r48<p BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
LA+$_U"Jk {
PF'5z#] NP BOOL bRemoved=FALSE;
) qyx|D for(int index=0;index<MAX_KEY;index++){
a0?iR5\ if(hCallWnd[index]==hWnd){
/SCZ& if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Q}Ze-JIL$ hCallWnd[index]=NULL;
64!ame}n+ HotKey[index]=0;
< R|)5/9 HotKeyMask[index]=0;
bL'# bRemoved=TRUE;
{wpMg KeyCount--;
#U$YZ#B break;
T`g?)/ }
uq|vNLW26 }
I[g?Ju > }
{V%%^Zhwy return bRemoved;
8sR }
J\xz^%p Lz9$,Y[ K#l
-? DLL中的钩子函数如下:
C`2*2Y%xkG bIb6yVnHi LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[ GR|$/(z= {
yhSk"e'G BOOL bProcessed=FALSE;
;/?Z<[B if(HC_ACTION==nCode)
%Ye)8+- {
A*\o
c if((lParam&0xc0000000)==0xc0000000){// 有键松开
u#41osUVW> switch(wParam)
o%V
@D'w {
XlPK3^'N)h case VK_MENU:
lBlSNDs MaskBits&=~ALTBIT;
:(bdI] break;
$z2xZqe case VK_CONTROL:
ZL4l
(&" MaskBits&=~CTRLBIT;
)|U_Z"0H^ break;
<CZI7]PM7 case VK_SHIFT:
lfxuc7Rdla MaskBits&=~SHIFTBIT;
aW0u8Dz break;
)myf)"l5 default: //judge the key and send message
U6c)"^\ break;
*F\T}k7 }
8%;}LK for(int index=0;index<MAX_KEY;index++){
Ne &Xf if(hCallWnd[index]==NULL)
tMxsR>sH continue;
p!HPp Ef+# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a4A`cUt {
Z"6 2#VM SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
)ZT6:) bProcessed=TRUE;
DNm(:%)0 }
QuSV&>T\ }
5~@?>)TBv }
FovE$Dj] else if((lParam&0xc000ffff)==1){ //有键按下
Pv< QjY switch(wParam)
d>lt {
Wyy^gJl case VK_MENU:
mSU@UD|' MaskBits|=ALTBIT;
w+t# Yb\7 break;
i/NDWVFD case VK_CONTROL:
-h>Z,-DE6 MaskBits|=CTRLBIT;
~'NX~<m break;
Gx.P]O 3 case VK_SHIFT:
f"vk# 3 MaskBits|=SHIFTBIT;
rpUy$qrRc break;
J6*f Uh default: //judge the key and send message
MVeFe\r break;
vTpStoUM }
}P#Vsqe V for(int index=0;index<MAX_KEY;index++){
t";{1. if(hCallWnd[index]==NULL)
5,S,\O9>X continue;
fZ[kh{| if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~ct2`M$TL( {
z<a$q3!# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8jRs=I bProcessed=TRUE;
]53O}sH> }
y|^EGnaE }
F;#zN }
9*4 . if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
!6M Bxg > for(int index=0;index<MAX_KEY;index++){
G@9u:\[l if(hCallWnd[index]==NULL)
Yg/}ghF\ continue;
Vr 8:nP: if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
`AR"!X SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
yk<VlS //lParam的意义可看MSDN中WM_KEYDOWN部分
@|BD|{k }
>W
r$Y{ }
a.?v*U@z@# }
ZP-dW|<[x return CallNextHookEx( hHook, nCode, wParam, lParam );
Dv@PAnk3C }
Rv,82iEKs flP>@i:e6 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
P'sfi>A TtPr)F| BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
JT04vm4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
H8&p<= vs+QbI6>- 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
B52yaG8C I+|uUg5 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
JdiP>KXV {
C`NmZwL if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
F}D3,&9N {
<4c%Q) //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
(0OM"`j SaveBmp();
y@3Q;~l, return FALSE;
o&z!6"S< }
Me,<\rQ …… //其它处理及默认处理
;'}'5nO=$ }
H-,TS^W H@D;e w>[T&0-N 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。
J=iRul^S .*Vkua 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。
rLzW` u]E.iXp 二、编程步骤
PO o%^'( I8u!\F 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";
NEVp8)w IP ,.+:i 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]g,lRG Z5B/|{ 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;
c<4F4k7 !n<o)DsZR 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;
? %(spV "|t!7hC 5、 添加代码,编译运行程序。
VRbQdiZ{ : @6mFTV 三、程序代码
dJi|D M'2r@NR8 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
){P^P!s$ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
()\jCNLT #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
!9]d|8! #if _MSC_VER > 1000
TH4\HY9qa? #pragma once
>zngJ$ #endif // _MSC_VER > 1000
UpfZi9v?W #ifndef __AFXWIN_H__
&|
!B!eOY #error include 'stdafx.h' before including this file for PCH
0V`[Zgf #endif
BzN@gQo #include "resource.h" // main symbols
#U ASH& class CHookApp : public CWinApp
%tm p {
7-*=|gl+ public:
Qxa{UQh}9 CHookApp();
}k7'"`#?" // Overrides
a#[-*ou` // ClassWizard generated virtual function overrides
Ck'aHe22' //{{AFX_VIRTUAL(CHookApp)
Ri)uq\E/# public:
fS=hpL6]@ virtual BOOL InitInstance();
jfp z`zE virtual int ExitInstance();
tR)H~l7q //}}AFX_VIRTUAL
+Xy*?5E;C //{{AFX_MSG(CHookApp)
jc:s` 4 // NOTE - the ClassWizard will add and remove member functions here.
?*u*de[, // DO NOT EDIT what you see in these blocks of generated code !
314=1JbL //}}AFX_MSG
L0NA*C
DECLARE_MESSAGE_MAP()
lAi2,bz" };
l]6%lud8_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
9P WY52! BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
X.FGBR7=q BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1^G{tlA- BOOL InitHotkey();
'@=PGpRF BOOL UnInit();
"%6/a7S #endif
d~9!,6XM #FH[hRo=6 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
GJA`l8`SQ #include "stdafx.h"
\Qy$I-Du #include "hook.h"
tTanW2C #include <windowsx.h>
F]+~x/! #ifdef _DEBUG
r ?m6$ #define new DEBUG_NEW
hdma=KqZ( #undef THIS_FILE
y 1\'(1 static char THIS_FILE[] = __FILE__;
$8~e}8dt| #endif
Jkt4@h2Q} #define MAX_KEY 100
=E*Gb[r_7 #define CTRLBIT 0x04
)>a B #define ALTBIT 0x02
('[TLHP #define SHIFTBIT 0x01
# Su~`] #pragma data_seg("shareddata")
#0Ds'pE- HHOOK hHook =NULL;
qxOi>v0\H UINT nHookCount =0;
PBjmGwg7 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
(eWPis[ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
\cJa;WM> static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
MXtkP1A` static int KeyCount =0;
{y)s.b~JB static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
2f~($}+* #pragma data_seg()
~NcQ1. HINSTANCE hins;
Zyf P;& void VerifyWindow();
ca<" BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
e^1uVN //{{AFX_MSG_MAP(CHookApp)
RP4Ku9hk // NOTE - the ClassWizard will add and remove mapping macros here.
\;X+X,M // DO NOT EDIT what you see in these blocks of generated code!
V ~{fB~ //}}AFX_MSG_MAP
Cfu=u *u END_MESSAGE_MAP()
J @IS\9O $A_]:qI2 CHookApp::CHookApp()
ay
)/q5 {
iA
}vKQ // TODO: add construction code here,
]e?x# <S // Place all significant initialization in InitInstance
_HOIT }
Fg]?zEa O[@q%&_ CHookApp theApp;
_i0kc,*C\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/b#l^x:j {
5&Ts7& . BOOL bProcessed=FALSE;
bpAv1udX-W if(HC_ACTION==nCode)
Gbpw5n;e {
26?W
nu60 if((lParam&0xc0000000)==0xc0000000){// Key up
dq;|?ESP switch(wParam)
HeGYu?& {
_*M42<wcO case VK_MENU:
OWp%v_y] MaskBits&=~ALTBIT;
E>LkJSy= break;
/UcV case VK_CONTROL:
^ <`(lyph MaskBits&=~CTRLBIT;
g]~h(mI break;
w8Q<r. case VK_SHIFT:
?4H#G)F MaskBits&=~SHIFTBIT;
E(pF:po break;
~+X9g default: //judge the key and send message
8LkP)]4^sO break;
3\O|ii }
.0 )Y for(int index=0;index<MAX_KEY;index++){
g6t"mkMY
L if(hCallWnd[index]==NULL)
#hfuH=&oh continue;
:,12")N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
S{]7C?4` {
hY5WJ; SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
:# E*Y8- bProcessed=TRUE;
MB
ju![n }
3f Xv4R;!: }
%_-zWVJ }
5wao1sd# else if((lParam&0xc000ffff)==1){ //Key down
/
O/`< switch(wParam)
^efb
5 {
l- pe4x case VK_MENU:
n6d9\ MaskBits|=ALTBIT;
5vAf7\* break;
Jb)#fH$L case VK_CONTROL:
3ya1'qUC MaskBits|=CTRLBIT;
b !@Sn/ break;
>7`<!YJkK case VK_SHIFT:
nMfFH[I4 MaskBits|=SHIFTBIT;
enNiI$H]`_ break;
W%2
80\h default: //judge the key and send message
Ab%;Z5$fr break;
u cwnA }
uJHu>M}~ for(int index=0;index<MAX_KEY;index++)
1(zsOeX {
@ l1 if(hCallWnd[index]==NULL)
+MbIB&fRCB continue;
> oA?6x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QVF]Ci_= {
;=j@,
yu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
cfox7FmW bProcessed=TRUE;
)VCzn~uf }
.@-9'<K?~ }
lkyzNy9R }
""Zp:8o if(!bProcessed){
i&njqK!wS for(int index=0;index<MAX_KEY;index++){
{e|*01hE if(hCallWnd[index]==NULL)
ONNpiK- continue;
$@d9<83= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ihh4pD27g SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
rhpPCt }
=.]l*6WV }
1Gt/Tq$_b }
D'Z|}(d& return CallNextHookEx( hHook, nCode, wParam, lParam );
%N;!+
;F_g }
|9"p|6G?B }?cGf-c BOOL InitHotkey()
VL[R(a6c
< {
{QBB^px if(hHook!=NULL){
oLWJm nHookCount++;
!zPG?q]3 return TRUE;
)!g{Sbl }
B!gGK|8 else
)
\Y7& hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
2<&Bw2 if(hHook!=NULL)
Om M=o*d nHookCount++;
r1ws1 rr= return (hHook!=NULL);
j1SMeDDM
~ }
T081G`li BOOL UnInit()
p^(&qk?ut {
iv phlw if(nHookCount>1){
_#$*y nHookCount--;
.nYUL> return TRUE;
t+,4Ya|Xj }
:Rs^0F8)c BOOL unhooked = UnhookWindowsHookEx(hHook);
*lef=:&,, if(unhooked==TRUE){
}M1sksk5 nHookCount=0;
0-LpqX hHook=NULL;
Ku&!?m@C }
@&D?e:|!U return unhooked;
Z/^ u }
A2}Rl%+X]6 +(uYwdcN BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:'aAZegQY {
.(J?a" BOOL bAdded=FALSE;
jCTAKaq for(int index=0;index<MAX_KEY;index++){
R3k1RE2c&g if(hCallWnd[index]==0){
SI:U0gUc hCallWnd[index]=hWnd;
b3wM;jv HotKey[index]=cKey;
OB~X/ HotKeyMask[index]=cMask;
j3q~E[Mz\ bAdded=TRUE;
DmXcPJ[9 KeyCount++;
B\g]({E break;
1FtM>&%4 }
z} '! eCl }
g*w<* return bAdded;
-@>BHC }
#_mi `7!B# ~[k%oA%W BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vK$"# F~ {
8A{_GH{: BOOL bRemoved=FALSE;
vzF5xp. for(int index=0;index<MAX_KEY;index++){
A]L%dFK if(hCallWnd[index]==hWnd){
_2b tfY1U if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Og;-B0,A hCallWnd[index]=NULL;
iTW? W\d HotKey[index]=0;
Knhp*V? HotKeyMask[index]=0;
`Q+moX bRemoved=TRUE;
KYJjwXT28W KeyCount--;
$8l({:*q0 break;
`si#aU }
oJKa"H-jL }
#k3t3az2{ }
c:83LZ return bRemoved;
1_$xSrwcF }
c`x7u}C q P ;A}C void VerifyWindow()
@DW[Z`X {
e6=]m#O9 for(int i=0;i<MAX_KEY;i++){
,wKe
fpV;5 if(hCallWnd
!=NULL){ 9;yn}\N `
if(!IsWindow(hCallWnd)){ d2X[(3
hCallWnd=NULL; m~Ld~I"
HotKey=0; yBLK$@9
HotKeyMask=0; ,fEO>
i
KeyCount--; 0'&X
T^"
} .I3?7
} c62=* ] ,
} 5q@LxDy,b
} D .vw8H3
\b[9ebME
BOOL CHookApp::InitInstance() hP J4Oj1O
{ > Oh?%%6
AFX_MANAGE_STATE(AfxGetStaticModuleState()); k
{-
hins=AfxGetInstanceHandle(); PLM _#+R>
InitHotkey(); ,_!6U
return CWinApp::InitInstance(); \qsw"B*tv`
} qDWsvx]
eMK+X \
int CHookApp::ExitInstance() Ou'?]{
{ >Ps7I
VerifyWindow(); !gwjN_ZJ^
UnInit(); zr76_~B1u
return CWinApp::ExitInstance(); n{*e 9Aw
} 57F%j3.|/
^"8G`B$r
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file I
PE}gp
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]L2Oz
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fpM#XFj
#if _MSC_VER > 1000 9^P2I)aD
#pragma once }aB#z<B6
#endif // _MSC_VER > 1000 nW\(IkX\
QbYc[8-[
class CCaptureDlg : public CDialog 'NZGQebK
{ '%v#v 3'
// Construction 4^c-D
public: EjEFg#q
BOOL bTray; QzGV.Mt2
BOOL bRegistered; vUQFQ
BOOL RegisterHotkey(); 4{9d#[KW
UCHAR cKey; D-9\~gvh
UCHAR cMask; $awi>#[
void DeleteIcon(); 8U~.\`H-PT
void AddIcon(); D)='8jV7
UINT nCount; _17|U K|N
void SaveBmp(); >L((2wfiN
CCaptureDlg(CWnd* pParent = NULL); // standard constructor B\j~)vg
// Dialog Data `ia %)@
//{{AFX_DATA(CCaptureDlg) tP
~zKU
enum { IDD = IDD_CAPTURE_DIALOG }; -237Lx$/
CComboBox m_Key; jigs6#
BOOL m_bControl; OKuD"
BOOL m_bAlt; k/Mp6<?C:
BOOL m_bShift; QHf$f@bjI
CString m_Path; V7CoZnz
CString m_Number; c $;\i
//}}AFX_DATA ^.X [)U
// ClassWizard generated virtual function overrides J$uM 03
//{{AFX_VIRTUAL(CCaptureDlg) aP~gaSx
public: p(3sgY1
virtual BOOL PreTranslateMessage(MSG* pMsg); H;_yRUY9
protected: @
"d2.h
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u7]<=*V]
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 4yV].2#rl"
//}}AFX_VIRTUAL V:
p)m&y6
// Implementation mE$dO3
protected: ~bU7QLr
HICON m_hIcon; "|LQK0q3
// Generated message map functions QrjDF>
//{{AFX_MSG(CCaptureDlg) i1*C{Lf;%)
virtual BOOL OnInitDialog(); B<
;==|
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3_ 2hC!u!K
afx_msg void OnPaint(); W04av_u 5
afx_msg HCURSOR OnQueryDragIcon(); MZm'npRf
virtual void OnCancel(); 744=3v
afx_msg void OnAbout(); ySX/=T:<;
afx_msg void OnBrowse(); aPIr_7e
afx_msg void OnChange(); 4\Di,PPu
//}}AFX_MSG )q+4k m6
DECLARE_MESSAGE_MAP() /5a;_
}; _x\m|SF_g
#endif O8 RzUg&
)LFD6\z1pl
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -ut=8(6&
#include "stdafx.h" 0<P(M: a
#include "Capture.h" +^Jwo)R'b
#include "CaptureDlg.h" .j 'wQ+_
#include <windowsx.h> 19y
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#pragma comment(lib,"hook.lib") |^5 /(16
#ifdef _DEBUG OD4W}Y.
#define new DEBUG_NEW _EKF-&Q6
#undef THIS_FILE Cg6;I.K
static char THIS_FILE[] = __FILE__; /Dd\PjIH{
#endif y_%&]/%
#define IDM_SHELL WM_USER+1 FLbZ9pX}
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,VG9)K1K
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &l^n4
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $%}>zqD1
class CAboutDlg : public CDialog 1M+Zkak7p
{ Ru7L>(Njs
public: Sr7@ buF
CAboutDlg(); GVp
// Dialog Data Vu|dV\N0*
//{{AFX_DATA(CAboutDlg) `1,eX)S
enum { IDD = IDD_ABOUTBOX }; )+B=z}:Nfz
//}}AFX_DATA jeFN*r_
// ClassWizard generated virtual function overrides cju@W] !
//{{AFX_VIRTUAL(CAboutDlg) ,)uPGe"y
protected: 6aSM*S)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7-g^2sa'(
//}}AFX_VIRTUAL Em9my2oE
// Implementation /$*; >4=>f
protected: e[p^p!a
//{{AFX_MSG(CAboutDlg) w%~qB5wF6
//}}AFX_MSG yA0Y
14\*
DECLARE_MESSAGE_MAP() >0M:&NMda
}; %
&+|==-
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ps |QW
{ aKOf;^@
//{{AFX_DATA_INIT(CAboutDlg) r&/D~g\"|[
//}}AFX_DATA_INIT 5Q;dnC
} "?+UI
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) &08Tns"
{ yI *M[0
CDialog::DoDataExchange(pDX); m^Rd Iy)
//{{AFX_DATA_MAP(CAboutDlg) % IPyCEJD
//}}AFX_DATA_MAP dc)wu]
} _32/WQF6
W=M<
c@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) s|KfC>#
//{{AFX_MSG_MAP(CAboutDlg) .8%vd
// No message handlers ~|qXtds$
//}}AFX_MSG_MAP -
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END_MESSAGE_MAP() Hc"N&
%X[
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {MA@A5
: CDialog(CCaptureDlg::IDD, pParent) -^y1iN'D
{ ul}4p{ m[
//{{AFX_DATA_INIT(CCaptureDlg) CARq^xI-
m_bControl = FALSE; 7kOE/>P?
m_bAlt = FALSE; ;q'DGzh
m_bShift = FALSE; !+%Az*ik
m_Path = _T("c:\\"); 5=Zp%[#
m_Number = _T("0 picture captured."); i<0D
Z_rub
nCount=0; NH<Y1t
bRegistered=FALSE; $;Q=iv3
bTray=FALSE; `s#sE.=o
//}}AFX_DATA_INIT ;}n|,g>
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 k`{RXx
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6MrZ6dz^
} (cu'
Bi$
0{V Z8
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?hP<@L6K
{ i#Ne'q;T
CDialog::DoDataExchange(pDX); =I
%g;YK
//{{AFX_DATA_MAP(CCaptureDlg) t00\yb^vJ8
DDX_Control(pDX, IDC_KEY, m_Key); |;X?">7NW
DDX_Check(pDX, IDC_CONTROL, m_bControl); X!7cz t
DDX_Check(pDX, IDC_ALT, m_bAlt); +"TI_tK,S
DDX_Check(pDX, IDC_SHIFT, m_bShift); 0EcC
DDX_Text(pDX, IDC_PATH, m_Path); o",f(v&u%
DDX_Text(pDX, IDC_NUMBER, m_Number); 3(cU)
//}}AFX_DATA_MAP K'a#M g
} CM+F7#T?n
HTR "mQ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~| 4U@
//{{AFX_MSG_MAP(CCaptureDlg) z"
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ON_WM_SYSCOMMAND() Dlqn~
ON_WM_PAINT() wUh3Hd'
ON_WM_QUERYDRAGICON() m~Kch~~]
ON_BN_CLICKED(ID_ABOUT, OnAbout) [8B
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ON_BN_CLICKED(IDC_BROWSE, OnBrowse) U)O?|
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ON_BN_CLICKED(ID_CHANGE, OnChange) 0BbiQXU
//}}AFX_MSG_MAP 6R$F =MB
END_MESSAGE_MAP() .E?bH V
;:#?~%7>
BOOL CCaptureDlg::OnInitDialog() .(TQ5/
~
{ Jdk3)
\
CDialog::OnInitDialog(); f}Ne8]U/Hc
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =
]dz1~/
ASSERT(IDM_ABOUTBOX < 0xF000); se^NQ=
CMenu* pSysMenu = GetSystemMenu(FALSE); I?^Q084
if (pSysMenu != NULL) _WRR
3
{ k;"R y8[k
CString strAboutMenu; SdjUhR+o
strAboutMenu.LoadString(IDS_ABOUTBOX); t1.zWe+C>3
if (!strAboutMenu.IsEmpty()) 9^#zxmH)
{ Mhu53DT
pSysMenu->AppendMenu(MF_SEPARATOR); 60U{ e}Mkb
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); -Fp!w "=T
} l`~a}y "n
} []6ShcqJ[v
SetIcon(m_hIcon, TRUE); // Set big icon Y:tW]
SetIcon(m_hIcon, FALSE); // Set small icon -@gJqoo>
m_Key.SetCurSel(0); gLXvw]
RegisterHotkey(); ^cKv JSY
CMenu* pMenu=GetSystemMenu(FALSE); q>D4ma^
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !R] CmK
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); o1p$9PL\:
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); BM=V,BZy
return TRUE; // return TRUE unless you set the focus to a control wM2)KM}$
} .Y^d9.
)$lSG}WD
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8a":[Q[
{ 4cErk)F4
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Y7b,td1
{ [`Qp;_K?t
CAboutDlg dlgAbout; w>9H"Q[
dlgAbout.DoModal(); UL@5*uiX
} Mi%1+
else C,VqT6E<
{ @=MZ6q
CDialog::OnSysCommand(nID, lParam); 'EH
} N#-kk3!Z;
} FgHB1x4;
'^.=gTk
void CCaptureDlg::OnPaint() 0%&fUz36E6
{ Jq?^8y
if (IsIconic()) =?I1V#.
{ hNR>Hy\
CPaintDC dc(this); // device context for painting x#}j3"
PP
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <5!RAdaj+
// Center icon in client rectangle S#0|#Z5qD
int cxIcon = GetSystemMetrics(SM_CXICON); eqUn8<<s
int cyIcon = GetSystemMetrics(SM_CYICON); *`pec3"
CRect rect; L2/<+Zw
GetClientRect(&rect); U7f&N
int x = (rect.Width() - cxIcon + 1) / 2; Ie`SWg*WL
int y = (rect.Height() - cyIcon + 1) / 2; 6!Tf'#TV~!
// Draw the icon 1 [~|
dc.DrawIcon(x, y, m_hIcon); Cn./N aq
} 9>$%F;JP44
else ).O2_<&?F
{ BB73'W8y
CDialog::OnPaint(); )/N Xh'
} JY050FL
} 1WA""yb
ReGO9}
HCURSOR CCaptureDlg::OnQueryDragIcon() ~V$5 m j
{ n.H`1@
return (HCURSOR) m_hIcon; ][$$
=
} pQgOT0f
i7w}`vs
void CCaptureDlg::OnCancel() 5-QvQ&eH.
{ '$L= sH5
if(bTray) Zs K'</7
DeleteIcon(); lj}1'K@M
CDialog::OnCancel(); Nno={i1jk
} @}rfY9o'
K?9H.#(
void CCaptureDlg::OnAbout() GL0' :LsZ
{ >8mW-p
CAboutDlg dlg; va*>q-QCr
dlg.DoModal();
$;`2^L
} 8'_
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qP .VK?jF|
void CCaptureDlg::OnBrowse() TX5/{cHd
{ &WWO13\qd
CString str; LF,c-Cv!jL
BROWSEINFO bi; -3XnK5
char name[MAX_PATH]; $YO]IK$
ZeroMemory(&bi,sizeof(BROWSEINFO)); _q!ck0_
bi.hwndOwner=GetSafeHwnd(); >a]
s
bi.pszDisplayName=name; [`nyq )
bi.lpszTitle="Select folder"; 0BwQ!B.
bi.ulFlags=BIF_RETURNONLYFSDIRS; K]azUK7
LPITEMIDLIST idl=SHBrowseForFolder(&bi); E6IL,Iq9
if(idl==NULL) %RF
return; &7y1KwfXn
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); %;XuA*e
str.ReleaseBuffer(); KqIe8bi^G
m_Path=str; Vblf6qaBs
if(str.GetAt(str.GetLength()-1)!='\\') I
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m_Path+="\\"; R$'nWzX#
UpdateData(FALSE); p.7p,CyB
} C4d1*IQk
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void CCaptureDlg::SaveBmp() *} 4;1OVT
{ 2F)OyE
CDC dc; $R}iL
dc.CreateDC("DISPLAY",NULL,NULL,NULL); j{+I~|ZB,
CBitmap bm; Z`h_oK#y15
int Width=GetSystemMetrics(SM_CXSCREEN); 6B P%&RL
int Height=GetSystemMetrics(SM_CYSCREEN); .TU15AAc
bm.CreateCompatibleBitmap(&dc,Width,Height); F>{uB!!L4
CDC tdc; 6E%k{ r
tdc.CreateCompatibleDC(&dc); e/~<\
CBitmap*pOld=tdc.SelectObject(&bm); <}>-ip?
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lk'jBl%
tdc.SelectObject(pOld); B
~bU7.Cd
BITMAP btm; 5 `mVe0uI
bm.GetBitmap(&btm); d`*vJ#$>2
DWORD size=btm.bmWidthBytes*btm.bmHeight; ,
Vr6
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )u:8Pv
BITMAPINFOHEADER bih; 9GOyVKUv
bih.biBitCount=btm.bmBitsPixel; ~oyPmIcb
bih.biClrImportant=0; D#(Pg
bih.biClrUsed=0; vx ,6::%]
bih.biCompression=0; AYtcN4\/
bih.biHeight=btm.bmHeight; BbhdGFG1
bih.biPlanes=1; ?AH<y/i<Y
bih.biSize=sizeof(BITMAPINFOHEADER); ITOGD
bih.biSizeImage=size; Wsz9X;
bih.biWidth=btm.bmWidth; G4]``
bih.biXPelsPerMeter=0; F=lj$?4{
bih.biYPelsPerMeter=0; SQRz8,sqkw
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1%{(?uz9
static int filecount=0; g[Y$SgJ
CString name; }6(:OB?
name.Format("pict%04d.bmp",filecount++); p#I1l2nE
name=m_Path+name; 3@A k6Uh
BITMAPFILEHEADER bfh; CF4y$aC#
bfh.bfReserved1=bfh.bfReserved2=0; Z ISd0hV
bfh.bfType=((WORD)('M'<< 8)|'B'); D
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bfh.bfSize=54+size; F/h)azcn
bfh.bfOffBits=54; <v?-$3YT
CFile bf; tfO
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if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ G9jtL$}E<
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,fbO}
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :Fh*4
&Z
bf.WriteHuge(lpData,size); @U,cj>K
bf.Close(); 2B|3`trY4x
nCount++; aE+E'iL
} |(Sqd;#v
GlobalFreePtr(lpData); 7p{lDQ
if(nCount==1) FG?B:Zl%T
m_Number.Format("%d picture captured.",nCount); P
)`-cfg
else n{M!l\1
m_Number.Format("%d pictures captured.",nCount); - iU7'
UpdateData(FALSE); R5Ti|k.~Y"
} RP6QS )|
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <[(xGrEZV
{ 97Whn*
if(pMsg -> message == WM_KEYDOWN) O4t0 VL$
{ 9(eTCe-~6
if(pMsg -> wParam == VK_ESCAPE) M)!:o/!c S
return TRUE; QTjOLK$e$
if(pMsg -> wParam == VK_RETURN) Eb=;D1)y]
return TRUE; "rIBy
} blA]z!FU
return CDialog::PreTranslateMessage(pMsg); ?4}EhXR(
} [/I1%6;
},5_h0
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) QZ54Osdl
{ 6'N!)b^-
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ()+;KF8
SaveBmp(); u3H2\<
return FALSE; ]]Da/^K=Z
} GQ8r5V4:
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6axmH~_
CMenu pop; ^R4eW|H
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^y"$k
CMenu*pMenu=pop.GetSubMenu(0); ~ ]q^Akq
pMenu->SetDefaultItem(ID_EXITICON); (FAd'$lhX}
CPoint pt; ;zO(bj>
GetCursorPos(&pt); ;DKwv}
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~f2zMTI|
if(id==ID_EXITICON) S,,3h0$X
DeleteIcon(); S:"t]gbF =
else if(id==ID_EXIT) -W+67@(\8H
OnCancel(); `$\Y,9E}x
return FALSE; 0R2 AhA#
} tnmuCz
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1W5\
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) :*!u\lV \
AddIcon(); WLWE%bDP
return res; [@= [<
_r
} hoi hdVjv
)gCHwu
void CCaptureDlg::AddIcon() 3HA$k[%7P
{ 5 b[:B~J
NOTIFYICONDATA data; 6Bp{FOj:Ss
data.cbSize=sizeof(NOTIFYICONDATA); zY|]bP[NEH
CString tip; G1~|$X@@
tip.LoadString(IDS_ICONTIP); !DCJ2h%E[_
data.hIcon=GetIcon(0); b~b(Ed{r
data.hWnd=GetSafeHwnd(); q9oF8&O,
strcpy(data.szTip,tip); dTaR8i
data.uCallbackMessage=IDM_SHELL; y+?tUSPP
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]T(O;y*m
data.uID=98; Md
{,@ G
Shell_NotifyIcon(NIM_ADD,&data); 8'B\%.+"8e
ShowWindow(SW_HIDE); h{sW$WA
bTray=TRUE; S_:(I^
} x[}e1sXXs
.KT+,Y
void CCaptureDlg::DeleteIcon() 1qUdj[Bj
{ ojVpw4y.
NOTIFYICONDATA data; u ?g!E."v
data.cbSize=sizeof(NOTIFYICONDATA); H]=3^ g64
data.hWnd=GetSafeHwnd(); :Rt5=0x
data.uID=98; 2ZtqZ64i
Shell_NotifyIcon(NIM_DELETE,&data); Bd O$
ShowWindow(SW_SHOW); !Y]}&pUP
SetForegroundWindow(); ].dTEzL9X
ShowWindow(SW_SHOWNORMAL); *-|+phim
bTray=FALSE; h;4g#|,
} 6ddkUPTF
[l#WS
void CCaptureDlg::OnChange() X=\#n-*
{ 45MK|4\Y_
RegisterHotkey(); R|+R4'
} ;wQWt_OtuJ
+zs6$OI]V
BOOL CCaptureDlg::RegisterHotkey() DAu|`pyC%
{ 0!vC0T[
UpdateData();
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UCHAR mask=0; BE"nyTQ
UCHAR key=0; jq0tMTb%L
if(m_bControl) |}M']Vz
mask|=4; cZ!s/^o?f
if(m_bAlt) l IFt/
mask|=2; : l>Ue&
if(m_bShift) i9!Urq-
mask|=1; z)VIbEy
key=Key_Table[m_Key.GetCurSel()]; ==XP}w)m
if(bRegistered){ mzT} C&hfP
DeleteHotkey(GetSafeHwnd(),cKey,cMask); +cV!=gDT
bRegistered=FALSE; }qD.Ek
} rmMO-!s
cMask=mask; Oq[E\8Wn
cKey=key; 3,vH:L4
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /XSPVc<
return bRegistered; 9wq%Fnt
} bg
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o`77gkLO
四、小结 m|]^f;7z
4C*3#/TR
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。