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:
f;ycQc@f
T5U(B3j_ 一、实现方法
H
@E-=Ly }% |GV 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:
z#&qWO \}qv}hU #pragma data_seg("shareddata")
] @1ncn7N HHOOK hHook =NULL; //钩子句柄
h"nv[0!) UINT nHookCount =0; //挂接的程序数目
0$nJd_gW_ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
U`'w{~"D% static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
:(x 90;DW static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
/%N~$ &wW static int KeyCount =0;
wA)R7%& static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
XlNB9\"5 #pragma data_seg()
s*}d`"YvH 0$49X 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。
b}G +7B ]7"mt2Q=3 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:
X]CaWxM d}415 XA BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
/L[:C=u cKey,UCHAR cMask)
}`^<ZNkb/ {
` }Hnj* BOOL bAdded=FALSE;
1$2Rs-J for(int index=0;index<MAX_KEY;index++){
CUw
9aH if(hCallWnd[index]==0){
1r w>gR hCallWnd[index]=hWnd;
qOa-@MN HotKey[index]=cKey;
oq<# HotKeyMask[index]=cMask;
Bp6Evi bAdded=TRUE;
-XY]WWlq KeyCount++;
(/Y
gcT break;
&q` =xF }
ZNA?`Z)f }
?,),%JQ return bAdded;
]g+(#x_.? }
IweQB} d //删除热键
qx? lCz a" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Cw^)}23R {
EGMcU|yL BOOL bRemoved=FALSE;
Yc5$915 for(int index=0;index<MAX_KEY;index++){
X:g5>is| if(hCallWnd[index]==hWnd){
y.oJzU[p% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Y2D)$ hCallWnd[index]=NULL;
-s!PO;qm HotKey[index]=0;
$fvUb_n HotKeyMask[index]=0;
cE]kI,Fw,M bRemoved=TRUE;
YGn:_9 KeyCount--;
6ensNr~ea break;
`") I[h }
6<~y!\4;F }
,zyrBO0 Eq }
_bz,G"w+: return bRemoved;
g%[Ruugu }
n<$I, IRE nMbV{h , E|Lh$9XONA DLL中的钩子函数如下:
XF$C)id2p nW%c95E LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
+1623E {
Gsh2 BOOL bProcessed=FALSE;
3a S>U # if(HC_ACTION==nCode)
-T(V6&'Qi {
f3h9CV if((lParam&0xc0000000)==0xc0000000){// 有键松开
nb!m>0*/ switch(wParam)
CUd'*Ewu {
<z4!m/f[( case VK_MENU:
#sHP\|rA MaskBits&=~ALTBIT;
5m3sjcp_ break;
t2$:*PvE case VK_CONTROL:
3G&1. 8 MaskBits&=~CTRLBIT;
Te/)[I'Tn break;
8+ W^t I case VK_SHIFT:
/][U$Q;Ke MaskBits&=~SHIFTBIT;
ljCgIfZ_4 break;
D.GSl default: //judge the key and send message
= @f;s<v/ break;
0&-sz=L }
#,;k>2j0 for(int index=0;index<MAX_KEY;index++){
Y#5S;?bR if(hCallWnd[index]==NULL)
]_,~q@r$ continue;
pQ hv3F if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
, $=V {
#>V;ZV5" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
5-QXvw(TH bProcessed=TRUE;
~!OjdE!u }
U#P#YpD;== }
y%y#Pb| }
ij),DbWd else if((lParam&0xc000ffff)==1){ //有键按下
G#*;3X$ switch(wParam)
PrcM'Q {
b +_E)4 case VK_MENU:
}1P MaskBits|=ALTBIT;
yC5|"+
A$ break;
4c yv
8 case VK_CONTROL:
*%e#)sn* MaskBits|=CTRLBIT;
-d~'tti break;
5*r6#[S\ case VK_SHIFT:
~eP2PG MaskBits|=SHIFTBIT;
td~3N,S break;
#]'xUgcE9 default: //judge the key and send message
g/J!U8W" break;
@wPmx*SF }
zkOgL9
(_8 for(int index=0;index<MAX_KEY;index++){
=EJ"edw]%0 if(hCallWnd[index]==NULL)
\4[Ta,;t continue;
tQ67XAb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{mQJ6
G'ny {
#@fypCc SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
gr=`_k4~1 bProcessed=TRUE;
XTJ>y@ }
vX\e*
v }
GSH{1VS_b }
wMoAvA_oS if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
@!da1jN for(int index=0;index<MAX_KEY;index++){
+9J>'oe'D if(hCallWnd[index]==NULL)
^b~5zhY& continue;
J Nz0!wi if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
df'g},_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
L9@jmh*E //lParam的意义可看MSDN中WM_KEYDOWN部分
6>I.*Qt \l }
:Mk}Suf&H }
[1U_c*;i }
DvCt^O* return CallNextHookEx( hHook, nCode, wParam, lParam );
/WfxI>v }
vo-{3]u#= :Eyv= = 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:
5,Y2Lzr K;PpS*! BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
M=A9ax BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%U7B0- hz%IxI9 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:
ap~Iz
_1'Pb/1 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
;GSJnV {
*&]l if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
2LU'C,o? {
P>-,6a> //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
$EIkk= z SaveBmp();
D,/9rH return FALSE;
Ah6x2(: }
08a|]li …… //其它处理及默认处理
[Bo$? }
KF)i66 3D0I5LF& val<N293L> 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。
^@2Vh*k Bl];^W^P 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。
6pR#z@, aw1J#5j`n 二、编程步骤
M'iKk[Hjfx P1n@E*~V5 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";
iurB8~Y xF;v 6d 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
1\0@?6`^ Gu).*cU 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;
rR~X>+K w ZAXfNA 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;
~0|hobk {6sfa?1j 5、 添加代码,编译运行程序。
Fr3t[:D x[" 三、程序代码
(K6StNtN ]s@8I2_ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
[udV } #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Y +54z/{ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Ui!|!V- #if _MSC_VER > 1000
V?BVk8D}; #pragma once
)6^xIh #endif // _MSC_VER > 1000
rU@?v+i #ifndef __AFXWIN_H__
3 H2;mqq #error include 'stdafx.h' before including this file for PCH
I >Q,]S1h #endif
Ai18]QD- #include "resource.h" // main symbols
u$8MVP class CHookApp : public CWinApp
Cl!jK^AbG {
wtS*w public:
,&]`
b#Rc CHookApp();
5Suc#0y // Overrides
|LE++t*X~ // ClassWizard generated virtual function overrides
/ASI0h //{{AFX_VIRTUAL(CHookApp)
MPN=K|* public:
%0]b5u virtual BOOL InitInstance();
L$Ar]O) virtual int ExitInstance();
zqr%7U //}}AFX_VIRTUAL
G| oG: //{{AFX_MSG(CHookApp)
*%'7~58ObS // NOTE - the ClassWizard will add and remove member functions here.
[Od9,XBa // DO NOT EDIT what you see in these blocks of generated code !
a' o8n6i //}}AFX_MSG
@|%ICG c DECLARE_MESSAGE_MAP()
B-'BJ|*4I };
VQMd[/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
G;c0 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
1e&b;l'*= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
14!a)Ijl BOOL InitHotkey();
\'tz| BOOL UnInit();
F6]!?@ #endif
.+L_!A D s,"E#? //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
(A fbS=[ #include "stdafx.h"
42wC."A #include "hook.h"
=M{CZm #include <windowsx.h>
@ZR4%A"X4 #ifdef _DEBUG
5>[sCl- #define new DEBUG_NEW
0*/ r' #undef THIS_FILE
;}jbdS3 static char THIS_FILE[] = __FILE__;
4m[C-NB!g #endif
| 4oM+n;Y #define MAX_KEY 100
G^@Jgx3n #define CTRLBIT 0x04
&\lS #define ALTBIT 0x02
`m; "I #define SHIFTBIT 0x01
)LrCoI =| #pragma data_seg("shareddata")
SOQ-D4q HHOOK hHook =NULL;
) wo2GF UINT nHookCount =0;
m<,G:?RM static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
],}afa!A static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
{G1aAM\Hz static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
;E? hz static int KeyCount =0;
w$[Ds static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
$N+{r= #pragma data_seg()
-1r &s HINSTANCE hins;
Nk7e iQ void VerifyWindow();
R ms01m>Y BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
!0csNg! //{{AFX_MSG_MAP(CHookApp)
#[0\=B- // NOTE - the ClassWizard will add and remove mapping macros here.
3auJ^B} // DO NOT EDIT what you see in these blocks of generated code!
CBnouKc: //}}AFX_MSG_MAP
-=t3O# END_MESSAGE_MAP()
A;WwS?fyQ _QMHPRELk CHookApp::CHookApp()
:Nj`_2 {
BUA6( // TODO: add construction code here,
R4~zL!7; // Place all significant initialization in InitInstance
a[74%L? }
c<h!QnJ Bpm5dT; CHookApp theApp;
,F`KQ
)\" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
'D0X?2 {
w^'?4M! BOOL bProcessed=FALSE;
Vyt~OTI\ if(HC_ACTION==nCode)
nc\C4g {
yhtvr5z1 if((lParam&0xc0000000)==0xc0000000){// Key up
aa0`y switch(wParam)
*e-ptgO {
Oa\ `; case VK_MENU:
e:GgA MaskBits&=~ALTBIT;
mj(&`HRs4 break;
MCi` TXr case VK_CONTROL:
+F7<5YW&( MaskBits&=~CTRLBIT;
|:(23O break;
>: W-C{% case VK_SHIFT:
a:-)+sgHw MaskBits&=~SHIFTBIT;
;la#Vf:] break;
V@f6Lj default: //judge the key and send message
GIRSoRVsh break;
"'F;lzq }
g* \P6 for(int index=0;index<MAX_KEY;index++){
?9(o*lp if(hCallWnd[index]==NULL)
_Vo)<--+I continue;
W3jXZ> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2GiUPtO&Gj {
#j^('K| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
W8G9rB|T bProcessed=TRUE;
ib(>vp$V }
L8bI0a]r"* }
TDAWI_83- }
Y(hW(bd; else if((lParam&0xc000ffff)==1){ //Key down
e'~-`Z9-) switch(wParam)
8:P*z {
SLJ&{`"7 case VK_MENU:
c7+Djqs MaskBits|=ALTBIT;
?~aZ#%*i8 break;
atLV`U&t case VK_CONTROL:
1jH7<%y MaskBits|=CTRLBIT;
ocIt@#20K break;
6%gB
E case VK_SHIFT:
jFuC=6aF MaskBits|=SHIFTBIT;
Qy=HrL]x break;
F-BJe] default: //judge the key and send message
,&.W6sW break;
s;fVnaqG: }
5q|+p?C for(int index=0;index<MAX_KEY;index++)
Si?$\H*: {
a
-xW 8 if(hCallWnd[index]==NULL)
6X@mPj[/ continue;
24T@N~\g if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r-RCe3%g% {
`y\*m]: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
?xtt7*'D bProcessed=TRUE;
`6a]|7|f }
I86e&"40 }
t6'61*)|0 }
)t|^Nuj8 if(!bProcessed){
ss?] for(int index=0;index<MAX_KEY;index++){
hc-lzYS if(hCallWnd[index]==NULL)
n?'d|h continue;
|h5kg<Zgo if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;yF[2P ; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Wgxn`6 }
`S"W8_m }
W8f`J2^"M }
U?bG`. X return CallNextHookEx( hHook, nCode, wParam, lParam );
[NYj.#,oR }
^9&b+u=X wA?@v|,dZ BOOL InitHotkey()
nIf N" {
; D1FAz if(hHook!=NULL){
5a'yXB} nHookCount++;
hP?7zz$*j return TRUE;
7^ 4jcfJH }
g[/^cJHQ else
O$a#2p& hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
}l~]b3@qu if(hHook!=NULL)
%$Aqbd nHookCount++;
t,RyeS/ return (hHook!=NULL);
./$
<J6-J }
q1 H=/[a BOOL UnInit()
53B.2
4Tm {
S[vRw]* if(nHookCount>1){
JW=uK$s O nHookCount--;
Yt -W1vl return TRUE;
@4;&hP2Z: }
@gNpJB]V BOOL unhooked = UnhookWindowsHookEx(hHook);
~eDI$IO if(unhooked==TRUE){
:Df)"~/mO+ nHookCount=0;
x_yF|]aI! hHook=NULL;
A:/}` }
hQXxG/yFm return unhooked;
/T,zZ9= }
+9RJ%i&Ec +Y7Pg'35 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
}d_<\ {
DB#$~(o BOOL bAdded=FALSE;
g[M]i6h2 for(int index=0;index<MAX_KEY;index++){
hHpx?9O+! if(hCallWnd[index]==0){
GE@uOJ6H hCallWnd[index]=hWnd;
im=5{PbJ^ HotKey[index]=cKey;
29%=: *R$ HotKeyMask[index]=cMask;
(wife#)~ bAdded=TRUE;
2xDQ:=ec KeyCount++;
J==}QEhQ{ break;
?FN9rhAC }
j~epbl)pC }
0{Bf9cH return bAdded;
h6g:(3t6m }
L/BHexOB !}ilN 1> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{gsW(T>) {
3!aEClRtq BOOL bRemoved=FALSE;
*%X.ym' for(int index=0;index<MAX_KEY;index++){
3)Zu[c[%'J if(hCallWnd[index]==hWnd){
Vb2\/e:k if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ZW>o5x__b hCallWnd[index]=NULL;
4Q;<Q" HotKey[index]=0;
Lx%:t YZ HotKeyMask[index]=0;
\7yJ\I bRemoved=TRUE;
#pX8{Tf[ KeyCount--;
v; Es^
YI break;
WHP;Neb6 }
RK-x?ZYH' }
p'}lN|"{O }
Je^Y&a~ return bRemoved;
vevf[eO- }
4f!dYo4L N+NK` void VerifyWindow()
BhLZ7 * {
^#;RLSv
for(int i=0;i<MAX_KEY;i++){
//<:k8 if(hCallWnd
!=NULL){ p5-<P?B
if(!IsWindow(hCallWnd)){ `gI~|A4
hCallWnd=NULL; &mcR
HotKey=0; "qS!B.rt:
HotKeyMask=0; jn^fgH?
KeyCount--; iT.|vr1HG
} ^7Lk-a7gp
} !Av1Leb9$
} EL7T'zJ$
} .a,(pq Jg
F$h'p4$T
BOOL CHookApp::InitInstance() ds]?;l"
{ ?I[h~vr6.
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^!}F%
hins=AfxGetInstanceHandle(); iS
InitHotkey(); Ihg~Q4t
return CWinApp::InitInstance(); %K?iNe
} .fEwk
.b,~f
int CHookApp::ExitInstance() <(YF5Xm6$h
{ FZ p<|t
VerifyWindow(); n'?4.tb
UnInit(); "U{,U`@?
return CWinApp::ExitInstance(); r1G8]a gO
} 4\ FP
Y
9i][
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file < eQ[kM
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5mavcle{4r
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sLi*SR
#if _MSC_VER > 1000 3u_oRs
#pragma once b@6:1x
#endif // _MSC_VER > 1000 c4 5?St
4UD' %}>y
class CCaptureDlg : public CDialog .E$q&7@/j
{ 2h)8Fq_"
// Construction BSKEh"f
public: 1i'Zei)
BOOL bTray; JpK[&/Ct
BOOL bRegistered; +_~,86
BOOL RegisterHotkey(); OR;&TbWF(R
UCHAR cKey; _R74/|
UCHAR cMask; :tLbFW[
void DeleteIcon(); [D[D`gpjA
void AddIcon(); t8vc@of$c,
UINT nCount; ;&kn"b}G;
void SaveBmp(); fK_~lGY(
CCaptureDlg(CWnd* pParent = NULL); // standard constructor fa{@$ppx
// Dialog Data 6V2j*J
//{{AFX_DATA(CCaptureDlg) B\[-fq
enum { IDD = IDD_CAPTURE_DIALOG }; 3gc"_C\$
CComboBox m_Key; :B.G)M\
BOOL m_bControl; fhRjYYGI
BOOL m_bAlt; F\LsI;G
BOOL m_bShift; TatMf;?h&
CString m_Path; KO&:06V{
CString m_Number; H&bh<KPMh
//}}AFX_DATA -B9S}NPo
// ClassWizard generated virtual function overrides 6m[9b*s7
//{{AFX_VIRTUAL(CCaptureDlg) oLS7`+b$
public: Pm^lr! 3p
virtual BOOL PreTranslateMessage(MSG* pMsg); `W"G!X-
protected: j#3m|dQ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TQJF+;%
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }g{_AiP
rv
//}}AFX_VIRTUAL c~+l-GIWm
// Implementation 3dG4pl~
protected: jdM=SBy7q
HICON m_hIcon; S}cF0B1E*
// Generated message map functions ?Y3@" rdR
//{{AFX_MSG(CCaptureDlg) m}5q]N";x
virtual BOOL OnInitDialog(); \_VmY!I5\
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .zSD`v@[
afx_msg void OnPaint(); nxQ}&n
afx_msg HCURSOR OnQueryDragIcon(); s$GF 95^
virtual void OnCancel(); ET-Vm >]
afx_msg void OnAbout(); _-%d9@x
afx_msg void OnBrowse(); M|r8KW~S)
afx_msg void OnChange(); i03gX<=*
//}}AFX_MSG t`u!]DHv
DECLARE_MESSAGE_MAP() I4ilR$jg
}; Y Pszk5hn
#endif UX_I6_&
"={L+di:M
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file v!trsjb
#include "stdafx.h" 9":2"<'+
#include "Capture.h" #ElejQ|?
#include "CaptureDlg.h" uD(t`W"
#include <windowsx.h> VAKy^nR5j
#pragma comment(lib,"hook.lib") xl2g0?
#ifdef _DEBUG 1;Xgc@
#define new DEBUG_NEW m r4b
#undef THIS_FILE "'A"U
static char THIS_FILE[] = __FILE__; |scUo~
#endif ({M?Q>s
#define IDM_SHELL WM_USER+1 %
{Q-8w!
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RrWNJ&o
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vg(K$o{BT
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
maDz W_3
class CAboutDlg : public CDialog *#2Rvt*Ox
{ O,mip
public: hZN<Yd8:
CAboutDlg(); ~G`J
r
// Dialog Data C3S`}o.
//{{AFX_DATA(CAboutDlg) =.b Y#4
enum { IDD = IDD_ABOUTBOX }; $bGD%9
z
//}}AFX_DATA [/ohk&
// ClassWizard generated virtual function overrides *48IF33&s
//{{AFX_VIRTUAL(CAboutDlg) SRCOs1(EK9
protected: %&<W(|U1<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4*M@]J "
//}}AFX_VIRTUAL p4wr`"Zz
// Implementation V`k8j-*s
protected: r7I
B{}>-
//{{AFX_MSG(CAboutDlg) JD~a UB%
//}}AFX_MSG &71e5<(dG
DECLARE_MESSAGE_MAP() n93zD*;5
}; 6[?}6gQ
sX:lE^)-z
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XnXb&@Y
{ !Iq{ 5:
//{{AFX_DATA_INIT(CAboutDlg) &1GUi{I
//}}AFX_DATA_INIT |(ocDmd
} Z;b+>2oL
A}G|Yfn
void CAboutDlg::DoDataExchange(CDataExchange* pDX) E*|tOj9`1n
{ 9#rt:&xo0
CDialog::DoDataExchange(pDX); Z@J.1SaB
//{{AFX_DATA_MAP(CAboutDlg) l2&hBacT
//}}AFX_DATA_MAP &qRJceT(
} ~m`!;rE
V8"Wpl9Cz
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0YS?=oi
//{{AFX_MSG_MAP(CAboutDlg) j|K.i/
// No message handlers k/lFRi-i
//}}AFX_MSG_MAP np6HUH
END_MESSAGE_MAP() ]}2Ztr)zZ
nY^Nbh0
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) '[Gm8K5
: CDialog(CCaptureDlg::IDD, pParent) Fu)Th|5GZ
{ -&Gfh\_NW
//{{AFX_DATA_INIT(CCaptureDlg) hz)9"B\S
m_bControl = FALSE; f\K#>u*
Q
m_bAlt = FALSE; \0AiCMX[
m_bShift = FALSE; n`L,]dco
m_Path = _T("c:\\"); h0VzIuV
m_Number = _T("0 picture captured."); uD)-V;}P@;
nCount=0; 3s(Ia^
bRegistered=FALSE; -7`-wu
bTray=FALSE; @Fx@5e
//}}AFX_DATA_INIT FA$zZs10\
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 qY(:8yC36
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); T9)wj][ .
} g%\L&}Jd
qm(1:iK,0
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1^{`lK~2
{ ._<ii 2K'
CDialog::DoDataExchange(pDX); JSW&rn
//{{AFX_DATA_MAP(CCaptureDlg) =n0*{~r
DDX_Control(pDX, IDC_KEY, m_Key); -(;LQDG |
DDX_Check(pDX, IDC_CONTROL, m_bControl); 8/Rm!.8+~
DDX_Check(pDX, IDC_ALT, m_bAlt); c8DZJSO
DDX_Check(pDX, IDC_SHIFT, m_bShift); `ROEV~
DDX_Text(pDX, IDC_PATH, m_Path); Dip*}8$o(w
DDX_Text(pDX, IDC_NUMBER, m_Number); $a.u05
//}}AFX_DATA_MAP _CdROo6I
} U9ZbVjqv@
a8s4T$
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b!a
%YLL
//{{AFX_MSG_MAP(CCaptureDlg) ^M
Ey,
ON_WM_SYSCOMMAND() nGa1a
ON_WM_PAINT() T1NH eH>
ON_WM_QUERYDRAGICON() v>-YuS
ON_BN_CLICKED(ID_ABOUT, OnAbout) F?4Sz#
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;^-:b(E
ON_BN_CLICKED(ID_CHANGE, OnChange) xP@/9SM
//}}AFX_MSG_MAP r
nBOj#N
END_MESSAGE_MAP() }uQ${]&D
Do;#NLrWb
BOOL CCaptureDlg::OnInitDialog() =nhzMU9c\y
{ *Bw #c
j
CDialog::OnInitDialog(); |:2c$zq
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); {ZqQ!!b
ASSERT(IDM_ABOUTBOX < 0xF000); K$-;;pUl
CMenu* pSysMenu = GetSystemMenu(FALSE); +hH}h?K
if (pSysMenu != NULL) Lq04T0
{ K{L.ZH>7
CString strAboutMenu; Z?1OdoT-
strAboutMenu.LoadString(IDS_ABOUTBOX); "#S>I8d
if (!strAboutMenu.IsEmpty()) e@jfIF0=}
{ v0 ];W|
pSysMenu->AppendMenu(MF_SEPARATOR); oI@9}*
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5"=:#zN
} E`xU m9F
} r_2btpL^
SetIcon(m_hIcon, TRUE); // Set big icon Y'N'hRD
SetIcon(m_hIcon, FALSE); // Set small icon 7rIlTrG
m_Key.SetCurSel(0); nW5K[/1D
RegisterHotkey(); ]Oso#GYD
CMenu* pMenu=GetSystemMenu(FALSE); >saI+u'o
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (@Zcx9
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); _01Px a2.
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); A3s57.Z]|
return TRUE; // return TRUE unless you set the focus to a control /77z\[CeYH
} |Fv?6qw+
2k+16/T
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) -e*BqH2t
{ v2J0u:#,
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Q!$IQJ]|Y
{ D 'L{wm
CAboutDlg dlgAbout; \ X$)vK
dlgAbout.DoModal(); -P#nT 2
} ;.s:X
else Kbas-</Si
{ "DjU:*'
CDialog::OnSysCommand(nID, lParam); =Ahw%`/&}]
} v*r9j8
} Z[}
$n-V
"$8w.C
void CCaptureDlg::OnPaint() &;v!oe
{ OCW+?B;
if (IsIconic()) }1>atgq]w
{ &=zU611,
CPaintDC dc(this); // device context for painting sXB+s
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3w'W~
// Center icon in client rectangle Jz$>k$!UD
int cxIcon = GetSystemMetrics(SM_CXICON); Yu3_=:
<C
int cyIcon = GetSystemMetrics(SM_CYICON); @HEPc95
CRect rect; 263*: Y
GetClientRect(&rect); }W}G X(?P
int x = (rect.Width() - cxIcon + 1) / 2; QymD-A"P
int y = (rect.Height() - cyIcon + 1) / 2; ZQ[~*)
// Draw the icon rzV"Dm$'
dc.DrawIcon(x, y, m_hIcon); 3!Bj{;A
} b1=pO]3u
else P<L&c_u
{ -N z}DW>
CDialog::OnPaint(); XV5`QmB9
} +/q0Y`v
} Z| L2oce
,?y7,nb
HCURSOR CCaptureDlg::OnQueryDragIcon() HRHrSf7
{ D rTM$)
return (HCURSOR) m_hIcon; K:w]>a
} (1 yGg==W.
%#9P?COs&W
void CCaptureDlg::OnCancel() .,mM%w,^O
{ ^zeL+(@ r/
if(bTray) 4Hd Si
DeleteIcon(); IMaYEO[
CDialog::OnCancel(); ^&m?qKN8
} sR!+d:LJ4
u]*5Ex (?
void CCaptureDlg::OnAbout() ;+/NjC1
{ :c<*%*e
CAboutDlg dlg; ~04[KG
dlg.DoModal(); 0||F`24
} kW(Kh0x
%M6
c0d[9-
void CCaptureDlg::OnBrowse() M5u_2;3
{ 6ZEdihBei
CString str; I61%H9;
BROWSEINFO bi; xgs@gw7!n0
char name[MAX_PATH]; 0BFz7
ZeroMemory(&bi,sizeof(BROWSEINFO)); H ;wR
bi.hwndOwner=GetSafeHwnd(); [`9^QEj
bi.pszDisplayName=name; R8uj3!3^
bi.lpszTitle="Select folder"; V4\560
bi.ulFlags=BIF_RETURNONLYFSDIRS; d<v~=
LPITEMIDLIST idl=SHBrowseForFolder(&bi); x~Cz?ljbn
if(idl==NULL) 3W'FcE)|E
return; 9'X@@6b*'
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6=3(oUl
str.ReleaseBuffer(); f?5A"-NS
m_Path=str; TZBVU&,{Z
if(str.GetAt(str.GetLength()-1)!='\\') 0V7 _n
m_Path+="\\"; ~4+8p9f
UpdateData(FALSE); +Y;8~+
} _<2RYXBC
}Az'Zu4 =
void CCaptureDlg::SaveBmp() z \^
{ Se/ss!If
CDC dc; ZR6&AiL(Bj
dc.CreateDC("DISPLAY",NULL,NULL,NULL); [%?hCc
CBitmap bm; sL8>GtVo
int Width=GetSystemMetrics(SM_CXSCREEN); GVZTDrC
int Height=GetSystemMetrics(SM_CYSCREEN); b?>VPuyBb
bm.CreateCompatibleBitmap(&dc,Width,Height); nUqL\(UuY
CDC tdc; GjL W`>
tdc.CreateCompatibleDC(&dc); (QKsB3X
CBitmap*pOld=tdc.SelectObject(&bm); {RJ52Gx(
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }v&K~!*
tdc.SelectObject(pOld); T,Fm"U6[(
BITMAP btm; `OBl:e
bm.GetBitmap(&btm); g+3Hwtl
DWORD size=btm.bmWidthBytes*btm.bmHeight; W
W35&mI)k
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }Q;BQ2[
BITMAPINFOHEADER bih; G}q<{<+$
bih.biBitCount=btm.bmBitsPixel; q55M8B 4w
bih.biClrImportant=0;
\eT/ %$
bih.biClrUsed=0; wO89&XZ<
bih.biCompression=0; S<9gyW
bih.biHeight=btm.bmHeight; hWm0$v1p
bih.biPlanes=1; $i -zMa
bih.biSize=sizeof(BITMAPINFOHEADER); df yrn%^Ia
bih.biSizeImage=size; #XfT1
bih.biWidth=btm.bmWidth; lm!FM`m
bih.biXPelsPerMeter=0; ]h0Y8kpd
bih.biYPelsPerMeter=0; |lY`9-M`I
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z) t{JHm:
static int filecount=0; ]An_5J
CString name; xjE7DCmA
name.Format("pict%04d.bmp",filecount++); _V&x`ks
name=m_Path+name; *cPN\Iu.W
BITMAPFILEHEADER bfh; yduuFK
bfh.bfReserved1=bfh.bfReserved2=0; wZ
O@J|
bfh.bfType=((WORD)('M'<< 8)|'B'); ^t7_3%%w
bfh.bfSize=54+size; 7<vy;"wB
bfh.bfOffBits=54; !9PX\Xbn
CFile bf; *iYMX[$
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~Z7)x7
z
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1S&0
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); w~p4S+k&
bf.WriteHuge(lpData,size); X4Lsvvz%@
bf.Close(); yj'Cy8
nCount++; $8=(I2&TW
} my]P_mE
GlobalFreePtr(lpData); 8'n#O>V@
if(nCount==1) HMhLTl{;
m_Number.Format("%d picture captured.",nCount); !@A|L#*
else y1nP F&_
m_Number.Format("%d pictures captured.",nCount); _E&U?>g+
UpdateData(FALSE); y&h~Oa?,;
} !%X>rGkc
#U:0/4P(
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &D)Hz
{ DVbYShB
if(pMsg -> message == WM_KEYDOWN) G$|G w
{ X:DMT>5k
if(pMsg -> wParam == VK_ESCAPE) @f\
X4!e*y
return TRUE; :bI,rEW#_
if(pMsg -> wParam == VK_RETURN) /8:gVXZi
return TRUE; ":nI_~q
} =?^-P{:\?
return CDialog::PreTranslateMessage(pMsg); MV9r5 |3-
} Kjv2J;Xuh
[@x
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p0
{ V@Ax}<$A
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @kS|Jz$iY
SaveBmp(); w~ijD ^g
return FALSE; 2UQN*_
} ,=yOek}
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ W%=Zdm
rv
CMenu pop; % /~os2R
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); d4Ixuux<3
CMenu*pMenu=pop.GetSubMenu(0); S3nB:$_-;
pMenu->SetDefaultItem(ID_EXITICON); ]!q
}|bP
CPoint pt; /\nJ
GetCursorPos(&pt); .x]'eq}
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); BF>T*Z-Ki
if(id==ID_EXITICON) 1xq3RD
DeleteIcon(); av"Dljc
else if(id==ID_EXIT) C-_(13S
OnCancel(); F_K
return FALSE; Ct-rD79l
} N!]PIWnC
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,nI_8r"M>
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6Q?BwD+>
AddIcon(); y|$vtD%c
return res; eog\pMv
} CZF^Wxk
*Rz!i m|
void CCaptureDlg::AddIcon() jQO*oq}
{ 0kkRK*fp}x
NOTIFYICONDATA data; '9f6ZAnYpQ
data.cbSize=sizeof(NOTIFYICONDATA); /5&3WG&<u
CString tip; E*Pz <
tip.LoadString(IDS_ICONTIP); | pF5`dX
data.hIcon=GetIcon(0); 7k.d|<mRv
data.hWnd=GetSafeHwnd(); ]6jHIk|
strcpy(data.szTip,tip); /j`i/Ha1
data.uCallbackMessage=IDM_SHELL; Og_2k
~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; M?QQr~a
data.uID=98; 6s> sj7
Shell_NotifyIcon(NIM_ADD,&data); ~ W2:NQ>i
ShowWindow(SW_HIDE); 9yO{JgKA
bTray=TRUE; qn5yD!1
} t`N
">c"
>fW+AEt\JB
void CCaptureDlg::DeleteIcon() '#;,oX~5
{ [Od>NO,n+]
NOTIFYICONDATA data; 38Bnf
data.cbSize=sizeof(NOTIFYICONDATA); 4x=V|"
data.hWnd=GetSafeHwnd(); Pn~pej5'K
data.uID=98; 8XLxT(YFIs
Shell_NotifyIcon(NIM_DELETE,&data); nh _DEPMq
ShowWindow(SW_SHOW); Ry3+/]
SetForegroundWindow(); ORUWslMt
ShowWindow(SW_SHOWNORMAL); F<6KaZ|
bTray=FALSE; EGp~Vo-
} 3?a0
+]
@m*&c* r
void CCaptureDlg::OnChange() 9O(i+fM
{ c#]'#+aH
RegisterHotkey(); Ukk-(gjX
} ,-w-su=J_
?$>u!V<'
BOOL CCaptureDlg::RegisterHotkey() ;t.SiA
{ 0X] ekq
UpdateData(); [lDt0l5^
UCHAR mask=0; M="WUe_
UCHAR key=0; >
gA %MT
if(m_bControl) U08<V:~
mask|=4; 9}K(Q=
if(m_bAlt) xiOv$.@q
mask|=2; |G`4"``]k
if(m_bShift) *7:u-}c!
mask|=1; gJ)h9e*m^
key=Key_Table[m_Key.GetCurSel()]; 'sT}DX(7M
if(bRegistered){ MEdIw#P.}{
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0 .6X{kO
bRegistered=FALSE; #+2:d?t
} [[Jv)?jm
cMask=mask; +X2 i/}
cKey=key; k1QpX@
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /xX,
return bRegistered; ,H#qgnp
} |!jYv'%
?3B t;<^
四、小结 "w:\@Jwu(
zm;*:]S
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。