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:
sZxTsUW
Vgkj4EE 一、实现方法
N6p0` )V+/@ 4 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:
I<,~>'cq. {T,}]oX #pragma data_seg("shareddata")
US^%pd HHOOK hHook =NULL; //钩子句柄
"L`BuAB UINT nHookCount =0; //挂接的程序数目
nk_X_y static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
GA`
bWl static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
64'QTF{D static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
=qoOr~ static int KeyCount =0;
;($xAAR static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
9z{g3m70@ #pragma data_seg()
D|<_96_m ZR%$f- 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。
/ueOc<[8" (UhJ Pco" 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:
%.wR@9? Q9h=1G\K BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
O"kb*// cKey,UCHAR cMask)
ZR0 OqSp] {
|uz\XK BOOL bAdded=FALSE;
` ~^ My~f for(int index=0;index<MAX_KEY;index++){
w-$iKtb. if(hCallWnd[index]==0){
(x@J@ GP* hCallWnd[index]=hWnd;
TuPD5-wB& HotKey[index]=cKey;
_Gt;= HotKeyMask[index]=cMask;
6R8>w, bAdded=TRUE;
:;hX$Qz KeyCount++;
!>ZBb\EyK break;
fx4#R(N }
]q4LNo }
ZREy I(_ return bAdded;
KF@%tR}V{ }
kka{u[ruA //删除热键
Anpp`>}N BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6I=xjgwvf {
{06ClI BOOL bRemoved=FALSE;
fF>hca> for(int index=0;index<MAX_KEY;index++){
Z%LS{o~LK. if(hCallWnd[index]==hWnd){
]N0B.e~D if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
_A&
[rBm| hCallWnd[index]=NULL;
l+@k:IK HotKey[index]=0;
+t1+1Zv HotKeyMask[index]=0;
\}9)`1D bRemoved=TRUE;
\o3s&{+y, KeyCount--;
xhCQRw break;
uPN^o.,/. }
_D@QsQ_Z }
} _];yw }
Wd(|w8J{a return bRemoved;
ZAeJTCCk }
]9'F<T= $_ _*[vKS A& VKu_l DLL中的钩子函数如下:
pFiE2V_aS nRw.82eK. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
)+hJi/g {
_8-1wx BOOL bProcessed=FALSE;
Er8F_,M+ if(HC_ACTION==nCode)
q o-|.I {
'qo(GGC M if((lParam&0xc0000000)==0xc0000000){// 有键松开
a #s
Nd switch(wParam)
<;>k[P' {
[;
$:Lr case VK_MENU:
I7SFGO MaskBits&=~ALTBIT;
|HJ`uGN<b break;
)k[XO case VK_CONTROL:
`WxGU MaskBits&=~CTRLBIT;
,1!Y!,xy break;
Wnp[8IEU case VK_SHIFT:
!B{(EL=g MaskBits&=~SHIFTBIT;
1cMdoQ break;
k\/es1jOEh default: //judge the key and send message
KyDd( 'i break;
q3-cWfU }
j5[>HL for(int index=0;index<MAX_KEY;index++){
-Gl!W`$I` if(hCallWnd[index]==NULL)
p14$XV continue;
k%-UW% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
H15!QxD# {
&`>dY
/Y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
[AD%8H bProcessed=TRUE;
#a9R3-aP }
W$l4@A }
DIvxut }
?vF8 y;Jh else if((lParam&0xc000ffff)==1){ //有键按下
i? #U>0! switch(wParam)
I{H!KrM! {
JlE+CAny case VK_MENU:
FOPmvlA\-< MaskBits|=ALTBIT;
-)bu& break;
(5y*Btd= case VK_CONTROL:
;F71f#iY MaskBits|=CTRLBIT;
9WQ'"wyAQ break;
)liNjY@ case VK_SHIFT:
9n\v{k= MaskBits|=SHIFTBIT;
s-&i!d break;
(tzAUrC default: //judge the key and send message
K7(GdKZe break;
eISHV.QV }
AGVipI # for(int index=0;index<MAX_KEY;index++){
aK,\e/Oo if(hCallWnd[index]==NULL)
xs"\c7pC continue;
$SniQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G&M)n*o {
>%_i#|dE> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
LA6Ik_-F bProcessed=TRUE;
(V/!0Lj }
I3l1 _ }
Hb^ovc0 }
mryT%zSlM if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
v"J|Ebx for(int index=0;index<MAX_KEY;index++){
cj[%.M5iBA if(hCallWnd[index]==NULL)
cyL|.2, continue;
oK"#*n if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T0\[":
A SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#\z"k<{* //lParam的意义可看MSDN中WM_KEYDOWN部分
[E}pU8.t6 }
*s2 C+@ef }
1'k,P;s }
/wHfc[b> return CallNextHookEx( hHook, nCode, wParam, lParam );
ZQ_~
L!ot }
S|IDFDn IZ.b 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:
sP8_Y, |FFMQ" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
g^\>hjNX BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2Myz[)<P_ i.ivHV~- 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:
ty9(mtH+ aprgThoD LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
KDDx[]1Q {
0=OvVU;P if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
C$v
!emu {
o 7 &q //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
'1\UFz SaveBmp();
f{]W*!VV- return FALSE;
)L,Nh~ }
~@D!E/hZx …… //其它处理及默认处理
=VZ0+Yl }
M3)Id?|]6 e#tWQM3 y#lg)nB 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。
cW^u4%f't' 3+D4$Y" 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。
|q_Hiap#a %B Rll 二、编程步骤
r`:dUCFE }iB>3|\ 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";
Z2k5qs7g \3j4=K'nE 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
l-[5Zl;" 0LUw 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;
-kzg(+sm ~$4!C'0 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;
v%Su#xq/ T@N)BfkB
5、 添加代码,编译运行程序。
qNbgN{4 Ymg,NkiP0 三、程序代码
@'?7au '' .[o?qCsw ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
t~]tw #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
LO,k'gg< #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
DEpn> #if _MSC_VER > 1000
=,W~^<\" #pragma once
NUX2{8gs #endif // _MSC_VER > 1000
[\ppK C #ifndef __AFXWIN_H__
ew8Manx #error include 'stdafx.h' before including this file for PCH
LBhDP5qF #endif
HwZ@T &_4 #include "resource.h" // main symbols
v;R+{K87 class CHookApp : public CWinApp
0 aiE0b9c {
T7XbbU public:
}cI _$ CHookApp();
A4VVy~sd // Overrides
st(Y{Gs // ClassWizard generated virtual function overrides
'Z^KpW //{{AFX_VIRTUAL(CHookApp)
D??
\H\ public:
CK} _xq2b virtual BOOL InitInstance();
kS(v|d virtual int ExitInstance();
aaesgF //}}AFX_VIRTUAL
C6}`qD //{{AFX_MSG(CHookApp)
Ns`:= // NOTE - the ClassWizard will add and remove member functions here.
yvKKE // DO NOT EDIT what you see in these blocks of generated code !
s!K9-qZl< //}}AFX_MSG
K9euNa DECLARE_MESSAGE_MAP()
zzyD'n7D };
3VmF1w
2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
0[SrRpD BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.?-]+-J?` BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
1BA5| BOOL InitHotkey();
P;lDri BOOL UnInit();
%;tBWyq}_ #endif
u=!n9W~" (W$>!1~ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
TInp6w+u #include "stdafx.h"
Wwo`R5 #include "hook.h"
(C8r^m|A #include <windowsx.h>
$T}Dn[. #ifdef _DEBUG
si>gYO #define new DEBUG_NEW
{DGnh1 #undef THIS_FILE
*[wj ) static char THIS_FILE[] = __FILE__;
~px)Jd #endif
WzO[-csy #define MAX_KEY 100
n%:&N #define CTRLBIT 0x04
;"DI)hdz #define ALTBIT 0x02
&<S]=\ #define SHIFTBIT 0x01
"Bbd[ZI8 #pragma data_seg("shareddata")
{}v<2bS HHOOK hHook =NULL;
RB/;qdqR UINT nHookCount =0;
2o9IP>#u static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
HpTX6}^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
++M%PF [
{ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
}h`ddo static int KeyCount =0;
bjGQ04da static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
1
gx(L*y, #pragma data_seg()
I r;Z+}4>Y HINSTANCE hins;
7W\aX*] void VerifyWindow();
m^ [VM&% BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
_f~m&="T! //{{AFX_MSG_MAP(CHookApp)
e.pq6D5 // NOTE - the ClassWizard will add and remove mapping macros here.
sBm/9vu // DO NOT EDIT what you see in these blocks of generated code!
#_[W*-|L //}}AFX_MSG_MAP
RiM!LX END_MESSAGE_MAP()
8qQrJFm|3* +%RB&:K7, CHookApp::CHookApp()
q| 7$@H^* {
O_/|Wx // TODO: add construction code here,
~l>2NY // Place all significant initialization in InitInstance
gpzZs<ST }
SI@Yct]<g 9q
f=P3 CHookApp theApp;
9Kd:7@U LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
s~MCt|a {
Hs6}~d BOOL bProcessed=FALSE;
B#;0{ if(HC_ACTION==nCode)
[}bPkD {
7FD.3/ if((lParam&0xc0000000)==0xc0000000){// Key up
2XGbqZj switch(wParam)
naB`@ {
=5Auk5& case VK_MENU:
nvnJVkL9s MaskBits&=~ALTBIT;
?e+$?8l[3 break;
n"c3C) case VK_CONTROL:
&26H MaskBits&=~CTRLBIT;
I &I
q break;
fE/|U|5L[ case VK_SHIFT:
9J'3b < MaskBits&=~SHIFTBIT;
h9L/.>CX break;
GLIP;)h1 default: //judge the key and send message
sOLR *=F{ break;
!`F^LXGA }
@s/0 .7 for(int index=0;index<MAX_KEY;index++){
Kw^tvRt'* if(hCallWnd[index]==NULL)
f.y~ Sew continue;
`T;Y%"X! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-S %)2(f^ {
*<nfA} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
|;6l1]hk6 bProcessed=TRUE;
K~JXP5`( }
MW6KEiQ" }
@:"GgkyDl# }
koAM",5D else if((lParam&0xc000ffff)==1){ //Key down
[v$NxmRu switch(wParam)
#[{xEVf {
J=qPc}+ case VK_MENU:
bP ,_H MaskBits|=ALTBIT;
}8cX0mZ1j break;
$1$T2'C~+ case VK_CONTROL:
<"XDIvpc%L MaskBits|=CTRLBIT;
F"M$ "rC] break;
+O,h<*y case VK_SHIFT:
FI$#x%A MaskBits|=SHIFTBIT;
jB-)/8.qk break;
N$SJK default: //judge the key and send message
+B0G[k7 break;
^ M4-O~ }
K'zG[[P for(int index=0;index<MAX_KEY;index++)
kwd)5J {
h*GU7<F:a if(hCallWnd[index]==NULL)
AE"E($S` continue;
L/R ES if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@)YQiE$ {
|r=.}9
- SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ib%x&?|| bProcessed=TRUE;
t,yzqn
}
2i3& 3oz]O }
eZWR)+aq }
@j Y_^8#S if(!bProcessed){
"gPAxt for(int index=0;index<MAX_KEY;index++){
_ooSMp| if(hCallWnd[index]==NULL)
|ozlaj continue;
uJ! yM;{+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
zUhJr$N$ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
?~5J!|r# }
f{Dc R" }
MYb^ILz H3 }
aab?hR return CallNextHookEx( hHook, nCode, wParam, lParam );
HKdR?HM1 }
!bHM:!6^ sC .R. BOOL InitHotkey()
{PCf'n {
nBVknyMFNF if(hHook!=NULL){
!7K-Kqn nHookCount++;
5vso%}c return TRUE;
FiQx5}MMhu }
=abth6#) else
7o4 vf~ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
rGe^$!QB if(hHook!=NULL)
F^]?'`7md nHookCount++;
cs%NsnZ return (hHook!=NULL);
iY2%_b!5 }
Q4;br?2H BOOL UnInit()
RO"*&o'K' {
HGgw<Os-k if(nHookCount>1){
\O7?!i nHookCount--;
-~HlME*~f return TRUE;
[[[QBplJ }
c[Mz#BWG BOOL unhooked = UnhookWindowsHookEx(hHook);
(Rc0 l; if(unhooked==TRUE){
M\s^>7es nHookCount=0;
-0)So hHook=NULL;
~"*;lT5KX }
-e{H 8ro return unhooked;
pw7_j;}l }
d.7Xvx0Yww p ?HODwZ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}fo?K|Xx {
79^on8 k} BOOL bAdded=FALSE;
S %"7`xl for(int index=0;index<MAX_KEY;index++){
8elT/Wl if(hCallWnd[index]==0){
A/U tf0{3" hCallWnd[index]=hWnd;
n]B)\D+V^ HotKey[index]=cKey;
N[$(y}
!s HotKeyMask[index]=cMask;
T_}\ bAdded=TRUE;
_l?5GLl_F$ KeyCount++;
f-\l<o( break;
Zv=p0xH }
(!'; }
Oed&B return bAdded;
7 #,+Q(2 }
(WW,]#^
"gCSbMq(Vq BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
B(MO!GNg= {
nDvny0^a BOOL bRemoved=FALSE;
>NwrJSx for(int index=0;index<MAX_KEY;index++){
u%O^hcfb if(hCallWnd[index]==hWnd){
fxLhVJ"b if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
`,(1' hCallWnd[index]=NULL;
%;9eh' HotKey[index]=0;
ZUyM:$ HotKeyMask[index]=0;
MjU>qx:: bRemoved=TRUE;
{kJ[) 7 KeyCount--;
=*'X break;
ftq~AF }
'q[V*4g }
\]J"e% }
"VWxHRVg4M return bRemoved;
s=huOjKL]
}
+V|]:{3W 7$GP#V1r/ void VerifyWindow()
@fpxGMy& {
CRWO R pP for(int i=0;i<MAX_KEY;i++){
)m[!HE`cZ if(hCallWnd
!=NULL){ ,`|KNw5
if(!IsWindow(hCallWnd)){ d*3R0Q|#{
hCallWnd=NULL; cf@#a@7m9
HotKey=0; qRB7I:m-Wi
HotKeyMask=0; 7k3":2:
KeyCount--; B0Z~L){i
} /KKX;L[D(
} v *:m|wl
} A|>a
Gy
} wCvD4C.WH
kX1hcAa
BOOL CHookApp::InitInstance() 1'_OM h*;
{ t*Q12Q
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'd?8OV
hins=AfxGetInstanceHandle(); PfrW,R~r
InitHotkey(); dm$:xE":
return CWinApp::InitInstance(); kd\G>
} .yWdlq##
6}ax~wYct
int CHookApp::ExitInstance() ur#"f'|-
{ 0l_-
VerifyWindow(); ~[9 ]M)=O0
UnInit(); k5xirB_
return CWinApp::ExitInstance(); n?
s4"N6
} 1xtbhk]D
Vxgc|E^J
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )QZ?Bf
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6ldDt?iSg
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fQx 4/4j
#if _MSC_VER > 1000 <1jiU%!w
#pragma once %n}]$
d
#endif // _MSC_VER > 1000 0\Oeo8<7)~
R1q04Zj{2
class CCaptureDlg : public CDialog gieX`}
{ :,VyOmf
// Construction K->p&6s
public: hcaH
BOOL bTray; %)aDh
}
BOOL bRegistered; E0oJ|My
BOOL RegisterHotkey(); ^$#Q_Y|
UCHAR cKey; Y66 vJ<lM
UCHAR cMask; o!H"~5Trv!
void DeleteIcon(); E>V8|Hz;
void AddIcon(); 3]VTQl{P
UINT nCount; t1~*q)!Mo
void SaveBmp(); P7Y[?='v
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \|&5eeE@
// Dialog Data )O&$-4gL'
//{{AFX_DATA(CCaptureDlg) $K
G?d>wx
enum { IDD = IDD_CAPTURE_DIALOG }; zR<jZwo]#
CComboBox m_Key; :e9E#o
BOOL m_bControl; [w4z)!
BOOL m_bAlt; pI^n("|
BOOL m_bShift; a,tP.Xsl
CString m_Path; ?4~lA
L1
CString m_Number; QnGJ4F
//}}AFX_DATA ):[[Ch_
// ClassWizard generated virtual function overrides dvj`%?=
//{{AFX_VIRTUAL(CCaptureDlg) ,,iQG' *
public: r-V./M@L
virtual BOOL PreTranslateMessage(MSG* pMsg); l;;:3:
protected: l`u*,"$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support eeX)JC0A
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1IsR}uLh
//}}AFX_VIRTUAL kB:R-St
// Implementation eeX>SL5'i
protected: 0!zWXKX
HICON m_hIcon; }ps6}_FE
// Generated message map functions l:[=M:#p
//{{AFX_MSG(CCaptureDlg) N!va12
virtual BOOL OnInitDialog(); G
dooy~cn
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); AUq?<Vg\
afx_msg void OnPaint(); /;>EyWW
afx_msg HCURSOR OnQueryDragIcon();
6$Dbeb
virtual void OnCancel(); PQs9@]w[
afx_msg void OnAbout(); 2KX *x_-
afx_msg void OnBrowse(); }$UFc1He\J
afx_msg void OnChange(); I'j?T.
//}}AFX_MSG }l2JXf55
DECLARE_MESSAGE_MAP() #nd,c n
}; _8`|KY
#endif X3>(K1
bC{~/ JP
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &vn9l#\(
#include "stdafx.h" cP
Y^Bf5)
#include "Capture.h" v;A
#include "CaptureDlg.h" f;Dz(~hw
#include <windowsx.h> ["7}u^z@<+
#pragma comment(lib,"hook.lib") <*\J 6:^n
#ifdef _DEBUG _\<M58/z
#define new DEBUG_NEW +l#2u#e
#undef THIS_FILE !`Wu LhB`
static char THIS_FILE[] = __FILE__; .6hH}BM
#endif Mu%'cwp$
#define IDM_SHELL WM_USER+1 4H:WpW*r
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &d2/F i+
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o]j*
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <eI;Jph5
class CAboutDlg : public CDialog kDKpuA!
{ *SW,pHYnLb
public: @PI\.y_w
CAboutDlg(); (/M c$V
// Dialog Data 6 qq7:
//{{AFX_DATA(CAboutDlg) h
Na<LZ
enum { IDD = IDD_ABOUTBOX }; wVVe L$28
//}}AFX_DATA jL8zH
// ClassWizard generated virtual function overrides /IC'R"V a
//{{AFX_VIRTUAL(CAboutDlg) Zry>s0
protected: 7MfT~v
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y `{U45
//}}AFX_VIRTUAL q}!4b'z^
// Implementation c' 6H@m#=
protected: 8+u8piG
//{{AFX_MSG(CAboutDlg) }B5I#Af7
//}}AFX_MSG PX'LN
DECLARE_MESSAGE_MAP() Dz{e@+>M
}; zaZnL7ZJX
RD4)NN6y5}
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 40<&0nn
{ u%pief
//{{AFX_DATA_INIT(CAboutDlg) 8%4`Yj=
//}}AFX_DATA_INIT EI;\of2,
} %L/=heBBd
(pmo[2kg
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /F_
:@#H
{ JVkawkeX
CDialog::DoDataExchange(pDX); DHAWUS6
//{{AFX_DATA_MAP(CAboutDlg) ~JXHBX
//}}AFX_DATA_MAP %Z7!9+<
} g{%';
B'Wky>5)
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) w.8~A,5}Dh
//{{AFX_MSG_MAP(CAboutDlg) 'GFzI:Xr
// No message handlers ]ok>PH]
//}}AFX_MSG_MAP
W6~=?C
END_MESSAGE_MAP() c;^ J!e
^Toi_
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ff#-USK^R
: CDialog(CCaptureDlg::IDD, pParent) cabN<a
l
{ ^6+x0[13
//{{AFX_DATA_INIT(CCaptureDlg) #jX>FXo
m_bControl = FALSE; ?@1'WD t
m_bAlt = FALSE; wGvgMZ ]?'
m_bShift = FALSE; AV p[gr
m_Path = _T("c:\\"); +RkYW*|$S
m_Number = _T("0 picture captured."); H[D/Sz5`
nCount=0; ]c)SVn$6
bRegistered=FALSE; BGX@n#:
bTray=FALSE; h,x]
//}}AFX_DATA_INIT fDd!Mt
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ca=e_sg
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); z7q2+;L
} (5> ibe
sYXS#;|M
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) >-P0wowL
{ GHy#D]Z
CDialog::DoDataExchange(pDX); 'T[zh#v>S
//{{AFX_DATA_MAP(CCaptureDlg) kgz{m;R
DDX_Control(pDX, IDC_KEY, m_Key); sD8S2
DDX_Check(pDX, IDC_CONTROL, m_bControl); ]lUu%<-;
DDX_Check(pDX, IDC_ALT, m_bAlt); o(P:f)B
DDX_Check(pDX, IDC_SHIFT, m_bShift); RY{tX`
DDX_Text(pDX, IDC_PATH, m_Path); =FmU]DV
DDX_Text(pDX, IDC_NUMBER, m_Number); x/=j$oA
//}}AFX_DATA_MAP j;)6uia*A
} uNbA>*c4M
/<0D
E22
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $T6Qg(p
//{{AFX_MSG_MAP(CCaptureDlg) IMza
2
ON_WM_SYSCOMMAND() GcR`{ 3hO
ON_WM_PAINT() (5~C
_Y
ON_WM_QUERYDRAGICON() c*dww
ON_BN_CLICKED(ID_ABOUT, OnAbout) 9#<Og>t2y
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5-^%\?,x
ON_BN_CLICKED(ID_CHANGE, OnChange) 8-:k@W
//}}AFX_MSG_MAP zc+;VtP|8
END_MESSAGE_MAP() %K"%Qm=Tl
u7?juI#Cl
BOOL CCaptureDlg::OnInitDialog() 1c#'5~nB
{ G+uiZ(p>
CDialog::OnInitDialog(); s{e(- 7'
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Ug21d42Z4
ASSERT(IDM_ABOUTBOX < 0xF000); $)Yo g]}
CMenu* pSysMenu = GetSystemMenu(FALSE); 3Mx@
if (pSysMenu != NULL) hli10p$
{
#-T.@a1X
CString strAboutMenu; /BM1AV{s6
strAboutMenu.LoadString(IDS_ABOUTBOX); Nz*sD^SJa
if (!strAboutMenu.IsEmpty()) iwQ-(GjM[A
{ "Vq]|j,B/c
pSysMenu->AppendMenu(MF_SEPARATOR); 4Umsc>yfK
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zU~..;C
} <im<(=m9
} vLuQe0l{
SetIcon(m_hIcon, TRUE); // Set big icon ;YDF*~9u
SetIcon(m_hIcon, FALSE); // Set small icon |A0$XU{
m_Key.SetCurSel(0); v9U(sEDq
RegisterHotkey(); 6;cY!
CMenu* pMenu=GetSystemMenu(FALSE); D a[C'm=
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); IY6_JGe_w
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yvCR = C
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Jwd&[
O
return TRUE; // return TRUE unless you set the focus to a control d&uTiH? 0
} toqzS!&.v
.dT;T%3fO
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xGfDz*t
{ 87KrSZ
if ((nID & 0xFFF0) == IDM_ABOUTBOX) {~fCqP.2
{ Cc)P5\jh
CAboutDlg dlgAbout; *O>aqu
dlgAbout.DoModal(); UglG!1L
} A&c@8
else ]TgP!M&q
{ O}_a3>1DY
CDialog::OnSysCommand(nID, lParam); UMuuf6
} EWIc|b:
} 3]<re{)J9O
*frJ^ Ws{
void CCaptureDlg::OnPaint() S9R]Zl7{-
{
iN_D8dI
if (IsIconic()) =5~F6to
{ <m,yFk
CPaintDC dc(this); // device context for painting K;p<f{PE
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Xexe{h4t_>
// Center icon in client rectangle Pzp+I}
int cxIcon = GetSystemMetrics(SM_CXICON); pXh~#o6V
int cyIcon = GetSystemMetrics(SM_CYICON); K\+}q{
CRect rect; .^lbLN^2
GetClientRect(&rect); d:hL
)x
int x = (rect.Width() - cxIcon + 1) / 2; sD8m<
int y = (rect.Height() - cyIcon + 1) / 2; NOr
<,
// Draw the icon ]A72)1
dc.DrawIcon(x, y, m_hIcon); 'd#\7J>d
} qzA]2'~Q
else 0sDwTb"
{ BwJ^_:(p~
CDialog::OnPaint(); b/B`&CIA0"
} Y^2Qxo3"3
} 6WN(22Io
C`n9/[,#
HCURSOR CCaptureDlg::OnQueryDragIcon() 96pk[5lj{?
{ ]}[Yf
return (HCURSOR) m_hIcon; q|o|/ O-{
} Y/,$Y]%g
b"M`@';+
void CCaptureDlg::OnCancel() eh:}X}c=J]
{ 4r[pMJiq
if(bTray) -,Q $
DeleteIcon(); t{SMSp
CDialog::OnCancel(); Y^6[[vaj2
} hyb +#R
8b:clvh
void CCaptureDlg::OnAbout() &.Latx
{ Ji6`-~ k
CAboutDlg dlg; L;
q)8Pb
dlg.DoModal(); TcD[Teu
} 8.CKH4h
f[Fgh@4cj
void CCaptureDlg::OnBrowse() 8b 8\
{ 0^9:KZ.!
CString str; }B"|z'u
BROWSEINFO bi; E-sSRt
char name[MAX_PATH]; :,NFFN
ZeroMemory(&bi,sizeof(BROWSEINFO)); e" Eqi-
bi.hwndOwner=GetSafeHwnd(); qsihQd
bi.pszDisplayName=name; /&$"}Z6z
bi.lpszTitle="Select folder"; TTZ['HP
oI
bi.ulFlags=BIF_RETURNONLYFSDIRS; 1a&/Zlr
LPITEMIDLIST idl=SHBrowseForFolder(&bi); t0e{|du
if(idl==NULL) M_h8#7 {G
return; U.RW4df%E
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); VJN/#
str.ReleaseBuffer(); O:;OR'N9
m_Path=str; -4e)N*VVu
if(str.GetAt(str.GetLength()-1)!='\\') g={]Mzh
m_Path+="\\"; N&fW9s}
UpdateData(FALSE); NTm<6Is`
} U['JFLF
xN`r4
void CCaptureDlg::SaveBmp() aGB0-;.t7
{ JFRpsv
CDC dc; m']9Q3-
dc.CreateDC("DISPLAY",NULL,NULL,NULL); EWb(uWC8h
CBitmap bm; BFMS*t`
int Width=GetSystemMetrics(SM_CXSCREEN); 5[,+\
int Height=GetSystemMetrics(SM_CYSCREEN); 0{?:FQ#
bm.CreateCompatibleBitmap(&dc,Width,Height); <E>7>ZL
CDC tdc; 5=Kq@[(4
tdc.CreateCompatibleDC(&dc); F1gt3 ae
CBitmap*pOld=tdc.SelectObject(&bm); <rX\LwR
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =6cyE
tdc.SelectObject(pOld); -(\1r2
Y
BITMAP btm; HKTeqH_:
bm.GetBitmap(&btm); [x!i*
rW3
DWORD size=btm.bmWidthBytes*btm.bmHeight; ^^7L"je]g
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); euV $2Fg
BITMAPINFOHEADER bih; @s%X
bih.biBitCount=btm.bmBitsPixel; i}PK$sa#c
bih.biClrImportant=0; L#`2.nU
bih.biClrUsed=0; 7
9Qc`3a
bih.biCompression=0; 2J;kD2"!
bih.biHeight=btm.bmHeight; tYs8)\{
bih.biPlanes=1; .P)s4rQ\
bih.biSize=sizeof(BITMAPINFOHEADER); ,
Aq9fyC%
bih.biSizeImage=size; N[qA2+e$Z
bih.biWidth=btm.bmWidth; n1QEu"~Zj
bih.biXPelsPerMeter=0; `d7gm;ykp
bih.biYPelsPerMeter=0; @B,j;2eb
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); o'C~~Vg).
static int filecount=0; .E+OmJwD
CString name; XkPv*%Er8
name.Format("pict%04d.bmp",filecount++); #^|| ]g/N
name=m_Path+name; (n=9c%w
BITMAPFILEHEADER bfh; !1a}| !Zn
bfh.bfReserved1=bfh.bfReserved2=0; CO-Iar
bfh.bfType=((WORD)('M'<< 8)|'B'); /8xH$n&xoC
bfh.bfSize=54+size; N'I(P9@
bfh.bfOffBits=54; izMYVI?0
CFile bf; 7\IL
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tNK^z7Dm
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); oW0gU?Rr)u
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vO\:vp4fH
bf.WriteHuge(lpData,size); t]s94 R q
bf.Close(); JOBz{;:R{
nCount++; }>2t&+v+
} gaQ[3g
GlobalFreePtr(lpData); w{PUj
if(nCount==1) N0+hejz
m_Number.Format("%d picture captured.",nCount); b-PSm=`
else j!YNg*H
m_Number.Format("%d pictures captured.",nCount); O!;H}{[dg
UpdateData(FALSE); \B_i$<Sz
} zhNQuK,L
?-e7e%
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WtIMvk
{ }N?g|
if(pMsg -> message == WM_KEYDOWN) wHx}U M"
{ ?RHn @$g8M
if(pMsg -> wParam == VK_ESCAPE) 'X9AG6K1
return TRUE; lM>.@:
if(pMsg -> wParam == VK_RETURN) 6N"m?g*Z
d
return TRUE; rwy+~
} H4t)+(:D'
return CDialog::PreTranslateMessage(pMsg); /vHYM S
} d$pYo)8o({
^f9>l;Lb
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8qn 9|
{ OY: u',T
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >-b&v $
SaveBmp(); 4S tjj!ew
return FALSE; 0; 7#ji
} `|nH1sHFq
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `19qq]
CMenu pop; U_]=E<el
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B`i$Wt<7
CMenu*pMenu=pop.GetSubMenu(0); j_p`Ng
pMenu->SetDefaultItem(ID_EXITICON); z)
:ka"e
CPoint pt; 69>/@<
GetCursorPos(&pt); ymYBm:"
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :$Q`>k7A
if(id==ID_EXITICON) 1Pm4.C)
DeleteIcon(); 0Z"s_r}h
else if(id==ID_EXIT) jgG$'|s}
OnCancel(); u^t$cLIZ
return FALSE; /hL\,x2
} g0PT8]8
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xx_tpC?
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qlw>+y-i
AddIcon(); 9TC)
w|
return res; Lbcy:E*g
} k@yh+ v5
09'oz*v{#
void CCaptureDlg::AddIcon() 30s; }
{ D93gH1z
NOTIFYICONDATA data; {Ur7#h5
data.cbSize=sizeof(NOTIFYICONDATA); gljo;f:
CString tip; V@[rf<,
tip.LoadString(IDS_ICONTIP); m^<p8KZ
data.hIcon=GetIcon(0); :5J_5,?;`
data.hWnd=GetSafeHwnd(); p}uncIod
strcpy(data.szTip,tip); pr_>b`p6
data.uCallbackMessage=IDM_SHELL; 28a$NP\KW
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sf$o(^P9\A
data.uID=98; #AShbl jm+
Shell_NotifyIcon(NIM_ADD,&data); R::zuv
ShowWindow(SW_HIDE); 'S*k_vuN
bTray=TRUE; wjrG7*_Y4v
} (-,>qMQs
D SvmVI
void CCaptureDlg::DeleteIcon() yI&9\fn
{ -jB3L:
NOTIFYICONDATA data; z8E1 m"
data.cbSize=sizeof(NOTIFYICONDATA); ];1R&:t
data.hWnd=GetSafeHwnd(); "oR@JbdX
data.uID=98; @ &pqt6/t
Shell_NotifyIcon(NIM_DELETE,&data); -\4zwIH
ShowWindow(SW_SHOW); 7/aOsW"6
SetForegroundWindow(); #Y2i*:<
ShowWindow(SW_SHOWNORMAL); S(
bTray=FALSE; Or8kp/d
} 22&;jpL'?
lj4o#^lC
void CCaptureDlg::OnChange() .1#kDM
{ iG#}`
RegisterHotkey(); kJT+
} i7 w(S3a
H}/05e
BOOL CCaptureDlg::RegisterHotkey() Wpr
,jN8b
{ uR$i48}
UpdateData(); Y1)!lTG
UCHAR mask=0; ^AL2H'
UCHAR key=0; X:|8vS+0gU
if(m_bControl) }gv8au<
mask|=4; W3GNA""O
if(m_bAlt) po7>IQS]
mask|=2; B$XwTJ>
if(m_bShift) Ji?#.r`"n
mask|=1; ~e-z,:Af
key=Key_Table[m_Key.GetCurSel()]; UG](go't
if(bRegistered){ u -3:k
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5Sva}9H
bRegistered=FALSE; g<wRN#B
} n<7u>;SJQ
cMask=mask; nS9wb1Zl
cKey=key; _MuZ4tc
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]{GDS! )
return bRegistered; #+k*1Jg
} ~TqT}:,H
Z6Fp\aI8@
四、小结 ok{!+VCB5
esX)"_xf
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。