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:
5XA6IL|/l
n1.]5c3p 一、实现方法
_YO`x duT2:~H2 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:
0(:"q!h l"b78n #pragma data_seg("shareddata")
bWUo(B#*I HHOOK hHook =NULL; //钩子句柄
l)=Rj`M UINT nHookCount =0; //挂接的程序数目
N;<<-`i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
(#LV*&K%IC static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
GfL}f9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
##1[/D( static int KeyCount =0;
j4+hWalm static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Fgt/A#`fz #pragma data_seg()
Hz%#&E O2ety2}?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。
>Y)jt*vQ 'S E%9 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:
t<~riFs] 5pE[}@-c9 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
&tHT6,Xv( cKey,UCHAR cMask)
2syKYHV {
K=+w,H#`C BOOL bAdded=FALSE;
y%`^*E& for(int index=0;index<MAX_KEY;index++){
K(Zd-U if(hCallWnd[index]==0){
e=1&mO? hCallWnd[index]=hWnd;
.+|G`*1<i HotKey[index]=cKey;
s1:UCv-% HotKeyMask[index]=cMask;
p\b:uy6# bAdded=TRUE;
u <D&RT KeyCount++;
u23^* - break;
g9'50<|J }
VG q' }
[$OD+@~A2 return bAdded;
IAhyGD{b }
<P(d%XEl //删除热键
-"<H$ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_I3j7f,V {
.e"De-u BOOL bRemoved=FALSE;
O&E1(M|*> for(int index=0;index<MAX_KEY;index++){
!+JSg uy if(hCallWnd[index]==hWnd){
cQ1oy-paD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
^md7ezXL hCallWnd[index]=NULL;
v9u/<w68! HotKey[index]=0;
LN" bGe HotKeyMask[index]=0;
ofj7$se bRemoved=TRUE;
Q?I)1][ !" KeyCount--;
M)Vz9, break;
U$ _?T-x }
#xm<|s }
"|.>pD#0& }
^qy$M> return bRemoved;
[
C]=p }
rV[#4,} PF uy~5!i& QE=Cum
DLL中的钩子函数如下:
=_D82`p /n/U)!tp LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
lWd)(9Kj {
Gxy>aS3 BOOL bProcessed=FALSE;
L7wl3zG if(HC_ACTION==nCode)
FOM~Uj {
](x4q if((lParam&0xc0000000)==0xc0000000){// 有键松开
N 2L/A switch(wParam)
HI,1~Jw+ {
{!o-y= case VK_MENU:
|.*),t3
(w MaskBits&=~ALTBIT;
/-8v]nRB break;
wU2y<?$\8 case VK_CONTROL:
E`=y9r*Z MaskBits&=~CTRLBIT;
[j
'Ogm7" break;
OMvwmm case VK_SHIFT:
^ Gq2"rDM MaskBits&=~SHIFTBIT;
%+Z0$Q
break;
~Rs|W; default: //judge the key and send message
B5 C]4 break;
TEh]-x`
}
0{BPT>' for(int index=0;index<MAX_KEY;index++){
6IctW5b if(hCallWnd[index]==NULL)
oZA|IF8U0 continue;
x
+q"%9.c if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
2t<
dCw {
"SNsOf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
o~NeS|a bProcessed=TRUE;
?\<2*sW [k }
!6@xX08z }
0u,=OvU }
wf=#w}f else if((lParam&0xc000ffff)==1){ //有键按下
prlB9,3|C switch(wParam)
5y(irbk7 {
JAC W#'4hV case VK_MENU:
bsuUl*l) MaskBits|=ALTBIT;
OV7vwj/- break;
n{r+t=X case VK_CONTROL:
Zj<oh8 MaskBits|=CTRLBIT;
:0CR=]WM break;
yD#w @yG case VK_SHIFT:
} <2F]UuR MaskBits|=SHIFTBIT;
0Y)b319B break;
Te[[xhTyw default: //judge the key and send message
C:
kl/9M@ break;
>u*woNw(XM }
i>ORCOOU for(int index=0;index<MAX_KEY;index++){
!Ya
+ if(hCallWnd[index]==NULL)
\$?[>=<wB continue;
Y@9L8XNP> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
R>/M>*C {
**_VNDK+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
c*RZbE9k bProcessed=TRUE;
#xW%RF }
-fL|e/ }
iV'-j,-i }
s.=)p"pTd if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
z9w@-]) for(int index=0;index<MAX_KEY;index++){
qE$.a[ if(hCallWnd[index]==NULL)
k5!k3yI continue;
F|xXMpC.f
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
)tFFa*Z' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
oxO}m7ULH //lParam的意义可看MSDN中WM_KEYDOWN部分
&U4]hawbOU }
j"94hWb }
?aOR ^ K }
2-j|q6m5 return CallNextHookEx( hHook, nCode, wParam, lParam );
R3?~+y& }
JO :m:
M mKe{y. 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:
}^`{YD
t$l[ 4
R- BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(g7nMrE$j BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
hXz"}X n YLSG
5vF+ 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:
}{K)5k@ hZ2PP ^ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
cb'8Li8,j {
et9c<' if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
g:[&]o} :9 {
JSGUl4N //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
,l0s(Cg SaveBmp();
cLR8U1k' return FALSE;
NA/+bgyuT> }
6bHj<6>MX …… //其它处理及默认处理
+Kf::[wP7 }
^<y$+HcH 1"v;w!uh m.V mS7_I 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。
B5I(ai7<M g^0 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。
5~rs55W Ho\+xX 二、编程步骤
lPFMNRt~8 ,(c="L4[ 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";
A)`M*(~ }DZkCzK 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
D(h|r^5 ?nt6vqaV 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;
w~Y#[GW 2ZE4^j| 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;
6PPvfD^ \[>Rt 5、 添加代码,编译运行程序。
R0/~)
P Wq,UxMz 三、程序代码
Mm/GIa -C8awtbC ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
V).M\ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
`q
xg #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
E*
lqC h #if _MSC_VER > 1000
SR 43#!99Q #pragma once
\lY26' #endif // _MSC_VER > 1000
~?L. n:wu #ifndef __AFXWIN_H__
ol:_2G2xQ #error include 'stdafx.h' before including this file for PCH
;c;;cJc! #endif
wwpvmb #include "resource.h" // main symbols
oa9T3gQ? class CHookApp : public CWinApp
-7pZRnv {
9k*'5(D4S public:
Y.}n ,y|J} CHookApp();
wEkW= // Overrides
Gm6^BYCk // ClassWizard generated virtual function overrides
7vHU49DV //{{AFX_VIRTUAL(CHookApp)
,>~92 public:
FD`V39## virtual BOOL InitInstance();
U#Z}a
d?VX virtual int ExitInstance();
Zd5frc$ //}}AFX_VIRTUAL
P"xP%zqo //{{AFX_MSG(CHookApp)
9xWeVlfQ // NOTE - the ClassWizard will add and remove member functions here.
)?_c7
R // DO NOT EDIT what you see in these blocks of generated code !
ChBZGuO: //}}AFX_MSG
VTV-$Du[} DECLARE_MESSAGE_MAP()
a2g1 5;kM };
w>!KUT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Rq\.RR]( BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
:|fzGf BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
J@)6]d/, BOOL InitHotkey();
"0]i4d1l BOOL UnInit();
Uq[NOJC #endif
Put+<o
< WJg?R^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
jmAWto}. #include "stdafx.h"
py,z7_Nuh #include "hook.h"
^c-1wV`/ #include <windowsx.h>
un..UU4 #ifdef _DEBUG
P [gqv3V #define new DEBUG_NEW
fwOvlD&e #undef THIS_FILE
7[8PSoo static char THIS_FILE[] = __FILE__;
Ao=.=0os #endif
hDfsqSK0 / #define MAX_KEY 100
;zp0,[r #define CTRLBIT 0x04
@y}1%{,% #define ALTBIT 0x02
:.Np7[~{ #define SHIFTBIT 0x01
_STN ^
#pragma data_seg("shareddata")
%pV/(/Q HHOOK hHook =NULL;
y=q\1~] Z UINT nHookCount =0;
<S5Am%vo static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
\5O4}sm$* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
a[t2TjB static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
zf6k% static int KeyCount =0;
i"zWv@1z static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
#:236^xYS #pragma data_seg()
5]gd,&^?> HINSTANCE hins;
CB6<Vng}C void VerifyWindow();
e>MC
3D`5 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:uqsRFo&4 //{{AFX_MSG_MAP(CHookApp)
A-4\;[P\ // NOTE - the ClassWizard will add and remove mapping macros here.
&|55:Y87 // DO NOT EDIT what you see in these blocks of generated code!
dRt]9gIsx //}}AFX_MSG_MAP
Eiwo==M END_MESSAGE_MAP()
@-)?2CH[8 6x6PP}IX CHookApp::CHookApp()
.3!=]= {
r1xNU0A // TODO: add construction code here,
>*dqFZF // Place all significant initialization in InitInstance
)CEfG }
hesL$Z [ <+pwGKtD CHookApp theApp;
X8p-VCkV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
"ifYy>d {
0I& !a$: BOOL bProcessed=FALSE;
hbzU?_} if(HC_ACTION==nCode)
9>\s81^ {
A2g+m if((lParam&0xc0000000)==0xc0000000){// Key up
05.^MU?^U switch(wParam)
iIA&\'|;i {
8`kK)iCq case VK_MENU:
Hj$JXo[U MaskBits&=~ALTBIT;
0vt?yD break;
G2zfdgW${/ case VK_CONTROL:
U,~\}$<I MaskBits&=~CTRLBIT;
+A3@{2 break;
oaM $< case VK_SHIFT:
pQ!NhzQ MaskBits&=~SHIFTBIT;
STL&ZO break;
>@rsh-Z default: //judge the key and send message
g,r'].Jg break;
L"P$LEk }
kR3g,P{L for(int index=0;index<MAX_KEY;index++){
>PGW>W$ if(hCallWnd[index]==NULL)
8lg$] continue;
Ao69Qn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
/Z94<}C6b {
-uHD|
} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#ih(I7prH bProcessed=TRUE;
# 4L[8(+V }
d@<(Z7| }
z}&?^YU*)` }
x$tx!%,)/S else if((lParam&0xc000ffff)==1){ //Key down
=c"`>Vi@d switch(wParam)
k^:)|Z {
tXV9+AJ case VK_MENU:
QX1QYwcm G MaskBits|=ALTBIT;
I6,'o)l{_ break;
[#.E=s+& case VK_CONTROL:
0GK<l MaskBits|=CTRLBIT;
y1G Vn o break;
^2rNty,nH case VK_SHIFT:
y0k*iS
e MaskBits|=SHIFTBIT;
,]+P#eXgE break;
k7z;^: default: //judge the key and send message
R @N
I break;
jCa%(2~iQ7 }
a;WRTV for(int index=0;index<MAX_KEY;index++)
3(0k!o0" {
$T.we+u if(hCallWnd[index]==NULL)
) jv]Oz continue;
xb1 i{d if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?5_~Kn%2 {
_w0t+=& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
osPJ%I`^ bProcessed=TRUE;
/Ut h#s: }
SAMP,un7 }
9JYrP6I!_ }
YNyaz\L if(!bProcessed){
GVhO}m for(int index=0;index<MAX_KEY;index++){
nk|j(D if(hCallWnd[index]==NULL)
6A&e2K> A
continue;
`?r]OVe{y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
WDQtj$e+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
|h$*z9bsf }
^}7iouE C }
lO3W:,3_a }
Ysbd4rN return CallNextHookEx( hHook, nCode, wParam, lParam );
pESlBQ7{I }
3C'`K, ^PA >t$ BOOL InitHotkey()
VrLU07"0n {
ilJeI@ if(hHook!=NULL){
H'7AIY} nHookCount++;
(WZKqt)S"o return TRUE;
S81Z\=eK }
RP 'VEJ else
XHU&ix{Od hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-;9pZ'r if(hHook!=NULL)
{uH
4j4)2 nHookCount++;
Rj6:.KEJ return (hHook!=NULL);
7fRL'I#[@ }
O92a*) BOOL UnInit()
7yp7`|,p {
7xz~%xC. if(nHookCount>1){
,Fo7E nHookCount--;
#!V
[(/ return TRUE;
]+A>*0#" }
Pl^-]~ BOOL unhooked = UnhookWindowsHookEx(hHook);
*%<Ku&C if(unhooked==TRUE){
tTrUVuZ nHookCount=0;
ZfalB hHook=NULL;
at7|r\`?- }
v\7k return unhooked;
zWvG];fsN }
$jMU|{ 'A@[a_ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/LMb~Hy, {
$[9,1.?C BOOL bAdded=FALSE;
2_Me
4 for(int index=0;index<MAX_KEY;index++){
R7aS{8nn if(hCallWnd[index]==0){
qZRx,^gd hCallWnd[index]=hWnd;
_|%pe]St HotKey[index]=cKey;
q@ !p HotKeyMask[index]=cMask;
DF D5">g@ bAdded=TRUE;
FkJa+ZA KeyCount++;
!g:UkU\J break;
;-84cpfu }
pL` snVz }
,])@?TJb@ return bAdded;
- bL
7M5 }
^aVoH/q*C W}B4^l BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
AMqu}G {
R<W#.mpo6 BOOL bRemoved=FALSE;
w`XwW#!}@$ for(int index=0;index<MAX_KEY;index++){
,Ie~zZE& if(hCallWnd[index]==hWnd){
FI@2KM if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.N~qpynY hCallWnd[index]=NULL;
!NuYx9L?L HotKey[index]=0;
]e+IaZ[Wo HotKeyMask[index]=0;
c)Ft#vzg&e bRemoved=TRUE;
_@D}2 KeyCount--;
2,|*KN*e`W break;
wP3PI.g-g }
\phG$4(7+ }
]*a)'k_@[ }
bu"Jb4_a> return bRemoved;
I%xrDiK97 }
SxXh
N 2L.UEAt void VerifyWindow()
N^|r.J {
uF5d
]{Qt for(int i=0;i<MAX_KEY;i++){
fX G+88:2 if(hCallWnd
!=NULL){ /:dVW"A|
if(!IsWindow(hCallWnd)){ W.p->,N
hCallWnd=NULL; Lc^nNUzPo
HotKey=0; G}i\UXFE
HotKeyMask=0; THQW8 V
KeyCount--; FM9b0qE
} wbI(o4rXE
} (omdmT%D
} 9BLz
} f
; |[
H^"BK-`hs
BOOL CHookApp::InitInstance() D+rDgrv
{ $V?zJ:a>L
AFX_MANAGE_STATE(AfxGetStaticModuleState()); uR)itmc?
hins=AfxGetInstanceHandle(); x@.iDP@(
InitHotkey(); XRs/gUT
return CWinApp::InitInstance(); IC[SJVH;
} lsW.j#yE!
3@$h/xMJ
int CHookApp::ExitInstance() F']Vg31c
{ `6j?2plZ
VerifyWindow(); P;KbS~ SlC
UnInit(); a[s%2>e
return CWinApp::ExitInstance(); nL^6{I~
} v)N6ZOj*C
DS>s_3V
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wO}
3i6
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) doc5;?6
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ e^~t52]
#if _MSC_VER > 1000 \,
n'D
#pragma once f]T1:N*t
#endif // _MSC_VER > 1000 !QVd'e
Djf2ir'
class CCaptureDlg : public CDialog oZ6xHdPc4
{ xx;'WL,g
// Construction pzU">)
public: {KwLcSn
BOOL bTray; TOMvJ>bF
BOOL bRegistered; aSHZR
BOOL RegisterHotkey(); C==tJog[
UCHAR cKey; .NjdkHYR
UCHAR cMask; r\],5x'xSu
void DeleteIcon(); eV9:AN }K=
void AddIcon(); Qk-y0
UINT nCount; f+xGf6V
void SaveBmp(); .E;6Xx_+r
CCaptureDlg(CWnd* pParent = NULL); // standard constructor oK5(,8
(4
// Dialog Data 9U}EVpD
//{{AFX_DATA(CCaptureDlg) |w~zh6~
enum { IDD = IDD_CAPTURE_DIALOG }; m$LZ3=v%8
CComboBox m_Key; $<s@S;Ri
BOOL m_bControl; R<UjhCvx.
BOOL m_bAlt; 1b|<
BOOL m_bShift; ;SC|VcbyH
CString m_Path; ^"buF\3L
CString m_Number; &<UOi@
//}}AFX_DATA k}T~N.0
// ClassWizard generated virtual function overrides {7/6~\'/@
//{{AFX_VIRTUAL(CCaptureDlg) mz\m^g3
public: Z,iklB-
virtual BOOL PreTranslateMessage(MSG* pMsg); MeplM$9
protected: 6@F Z,e
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ci*TX
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f4tia.
//}}AFX_VIRTUAL .{ x5(bi0S
// Implementation !h4 So4p
protected: HKxrBQr78
HICON m_hIcon; T3?kabbF
// Generated message map functions ~{NDtB)
//{{AFX_MSG(CCaptureDlg) D1g1"^~g
virtual BOOL OnInitDialog(); A(s/Nz>
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); W}=2?vHV=
afx_msg void OnPaint(); P2s0H+<
afx_msg HCURSOR OnQueryDragIcon(); O/-OW: 03
virtual void OnCancel(); H+ M~|Ju7
afx_msg void OnAbout(); 5N|77AAxK
afx_msg void OnBrowse(); qob!!A14p
afx_msg void OnChange(); V&}Z# 9Dx
//}}AFX_MSG )7`~U"r
DECLARE_MESSAGE_MAP() XqwdJND
}; (6A{6_p
#endif U)l>#gf8
Z'j<wRf
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B " B
#include "stdafx.h" :iWV:0)P
#include "Capture.h" {MEU|9@
Y
#include "CaptureDlg.h" TX+t
#include <windowsx.h> 0WPxzmY
#pragma comment(lib,"hook.lib") bQeYFY#^
#ifdef _DEBUG eo,]b1C2n
#define new DEBUG_NEW D@ lJ^+
#undef THIS_FILE EnUo B<
static char THIS_FILE[] = __FILE__; ]E3g8?L
#endif ~G$OY9UC
#define IDM_SHELL WM_USER+1 7yj2we
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s`TBz8QO$
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gI%n(eY
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h7w<.zwu
t
class CAboutDlg : public CDialog {38aaf|'/
{ ?@,:\ ,G
public: tO0+~Wm
CAboutDlg(); df)1}/*L
// Dialog Data H9Z3.F(2
//{{AFX_DATA(CAboutDlg) Xg)yz~Ug
enum { IDD = IDD_ABOUTBOX }; VcL
//}}AFX_DATA Nl8Cctrf
// ClassWizard generated virtual function overrides bpILiC
//{{AFX_VIRTUAL(CAboutDlg) 0CR;t`M@
protected: %In"Kh*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %)e+w+
//}}AFX_VIRTUAL kO#`m]
// Implementation .`p_vS9
protected: -I*A `M
//{{AFX_MSG(CAboutDlg) D0P% .r"v
//}}AFX_MSG WI9.?(5q
DECLARE_MESSAGE_MAP() 93dotuF
}; .G]# _U
S ] &->5"
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !L_ SHlU
{ w\ :b(I
//{{AFX_DATA_INIT(CAboutDlg) aVb]H0
//}}AFX_DATA_INIT #+G2ZJxL|
} ba ?k:b
w~&]gyf
void CAboutDlg::DoDataExchange(CDataExchange* pDX) K_aN7?#.v`
{ :&%;s*-9
CDialog::DoDataExchange(pDX);
i=D,T[|>a
//{{AFX_DATA_MAP(CAboutDlg) g2]-Q.
//}}AFX_DATA_MAP v3"xJN_,[p
} Uu+C<j&-
r;C\eN
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t;]egk
//{{AFX_MSG_MAP(CAboutDlg) E0Djo'64
// No message handlers /z5lxS@#
//}}AFX_MSG_MAP 8hfh,v5(
END_MESSAGE_MAP() w-$w
>C[1@-]G%7
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)
(ZK >WoV
: CDialog(CCaptureDlg::IDD, pParent) \gkajY-?
{ )'~FDw\6
//{{AFX_DATA_INIT(CCaptureDlg) x,dv~QU
m_bControl = FALSE; OpLSjr
m_bAlt = FALSE; Yn>zR I
m_bShift = FALSE; G,-OH-M!
m_Path = _T("c:\\"); O| ]Ped9
m_Number = _T("0 picture captured."); ];;w/$zke
nCount=0; 6hK"k
bRegistered=FALSE; BT3O_X`u
bTray=FALSE; N -]PK%*
//}}AFX_DATA_INIT ~PnpYd<2
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sCQup^\
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E+zn\v
} c5e\ckqm^
F* }Q^%
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )yW_O:
{ kVnyX@
CDialog::DoDataExchange(pDX); 4d
G-
//{{AFX_DATA_MAP(CCaptureDlg) ]ECZU
DDX_Control(pDX, IDC_KEY, m_Key); MPn>&28"|K
DDX_Check(pDX, IDC_CONTROL, m_bControl); !^fR8Tp9
DDX_Check(pDX, IDC_ALT, m_bAlt); G3+a+=e
DDX_Check(pDX, IDC_SHIFT, m_bShift); N RSse"
DDX_Text(pDX, IDC_PATH, m_Path); "v!HKnDT
DDX_Text(pDX, IDC_NUMBER, m_Number); vXyo
//}}AFX_DATA_MAP "n }fEVJ,
} 2gAdZE&Y
X#,[2&17Fh
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) YBIe'(p
//{{AFX_MSG_MAP(CCaptureDlg) KHz838C]
ON_WM_SYSCOMMAND() &6=ZT:.6Te
ON_WM_PAINT() OIty
]c
ON_WM_QUERYDRAGICON() BJxmW's/
ON_BN_CLICKED(ID_ABOUT, OnAbout) 8M+F!1-#
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !a(qqZ|s
ON_BN_CLICKED(ID_CHANGE, OnChange) h)
PB
//}}AFX_MSG_MAP dG>Wu o
END_MESSAGE_MAP() !9 LAXM
EJaaW&>[
BOOL CCaptureDlg::OnInitDialog() ?>jArzI
{ _8pkejg
CDialog::OnInitDialog(); n3g
WMC
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G!LNP&~
ASSERT(IDM_ABOUTBOX < 0xF000); x ETVtq
CMenu* pSysMenu = GetSystemMenu(FALSE); #'Y6UGJ\n
if (pSysMenu != NULL) ZX6=D>)u
{ ,
gr&s+
CString strAboutMenu; 0*IY%=i
strAboutMenu.LoadString(IDS_ABOUTBOX); .Xz"NyW
if (!strAboutMenu.IsEmpty()) [-Tt11
{ k=~pA iRDN
pSysMenu->AppendMenu(MF_SEPARATOR); m\Fb ,
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); VE"0VB.
} MY*>)us\
} $4*E\G8
SetIcon(m_hIcon, TRUE); // Set big icon @1-GPmj-
SetIcon(m_hIcon, FALSE); // Set small icon pkV\D
m_Key.SetCurSel(0); $17
v,
RegisterHotkey(); X1V}%@3:
CMenu* pMenu=GetSystemMenu(FALSE); WlRZ|.
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CE7pg&dJ)i
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;7^j-6
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fRa-bqQ
return TRUE; // return TRUE unless you set the focus to a control *ez~~ Y
} 9Bvn>+_K
Z=Y_;dS9
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9k+&fyy
{ qTa]th;
if ((nID & 0xFFF0) == IDM_ABOUTBOX) !_z<W~t"
{ yH"$t/cU"R
CAboutDlg dlgAbout; %)hIpxOrX
dlgAbout.DoModal(); CbH T #
} # pjyhH@
else MV;Y?%>
{ 8&A|)ur4
CDialog::OnSysCommand(nID, lParam); >7(~'#x8A"
} zTBi{KrZ
} am'p^Z@
L[D/#0qp
void CCaptureDlg::OnPaint() ;GgQ@s@
{ T.w}6?2
if (IsIconic()) kq}eUY]
{ mLk6!&zN
CPaintDC dc(this); // device context for painting bHQKRV
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <j1d~XU}
// Center icon in client rectangle 3VRZM@i
int cxIcon = GetSystemMetrics(SM_CXICON); G0;EbJ/&
int cyIcon = GetSystemMetrics(SM_CYICON);
G_, t\
CRect rect; mp+\!
GetClientRect(&rect); &b@!DAwAJ
int x = (rect.Width() - cxIcon + 1) / 2; ?4,*RCaI
int y = (rect.Height() - cyIcon + 1) / 2; sRe#{EuJ
// Draw the icon U ygw*+
dc.DrawIcon(x, y, m_hIcon); sAjKf\][
} v1X&p\[d
else d0}%%T
{ ofPF}
CDialog::OnPaint(); |p8"9jN@}c
} #-gGsj;F
} rPo\Dz
e2-70UvW^
HCURSOR CCaptureDlg::OnQueryDragIcon() (4{ C7
{ 4Fr7jD,#k
return (HCURSOR) m_hIcon; f?>-yMR|
} B=Zukg1G
e0|_Z])D
void CCaptureDlg::OnCancel() sx-Hw4.a"
{ 94'k7_q
if(bTray) 5}d/8tS
DeleteIcon(); uku}Mr"p
CDialog::OnCancel(); {sna)v$;
} Oj4u!SY\j
;5Wx$Yfx
void CCaptureDlg::OnAbout() _,Rsl$Tk'
{ P"V{y|2
CAboutDlg dlg; fZw9zqg
dlg.DoModal(); MKVfy:g%So
} M8#*zCp{5
9Ew:.&d
void CCaptureDlg::OnBrowse() n2jvXLJq
{ wzDk{4U
CString str; cz7CrK~5
BROWSEINFO bi; j5,^9'
char name[MAX_PATH]; >2| [EZ
ZeroMemory(&bi,sizeof(BROWSEINFO)); l?o-!M{
bi.hwndOwner=GetSafeHwnd(); )DGz`->
bi.pszDisplayName=name; zldfRo\wl
bi.lpszTitle="Select folder"; Bg 7j5
bi.ulFlags=BIF_RETURNONLYFSDIRS; R%Ui6dCLo
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Hyq@O8
if(idl==NULL) n2xLgK=
return; "W &:j:o
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (
K6~Tj
str.ReleaseBuffer(); J0ZxhxX35
m_Path=str; 96"yNqBf
if(str.GetAt(str.GetLength()-1)!='\\') 9lZAa8Rx i
m_Path+="\\"; rP^TN^bd|
UpdateData(FALSE); ,?xLT2>J_
} E-yT
z.2r@Psk
void CCaptureDlg::SaveBmp() yqC Q24
{ sJ))<,e5I
CDC dc; h&=O-5
dc.CreateDC("DISPLAY",NULL,NULL,NULL); }J ei$0x
CBitmap bm; ]>R`;"(
int Width=GetSystemMetrics(SM_CXSCREEN); ~ON1Zw[+
int Height=GetSystemMetrics(SM_CYSCREEN); qj~flw1:
bm.CreateCompatibleBitmap(&dc,Width,Height); F_A%8)N
CDC tdc; u* t,i`
tdc.CreateCompatibleDC(&dc); YG0Px Zmi
CBitmap*pOld=tdc.SelectObject(&bm); fm(mO%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); B :.@Qi^
tdc.SelectObject(pOld); GVmC }>z
BITMAP btm; s<[A0=LH
bm.GetBitmap(&btm); ;y>S7n>n:
DWORD size=btm.bmWidthBytes*btm.bmHeight; ?z2jk
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); gM4P j[W
BITMAPINFOHEADER bih; IDy_L;'`*
bih.biBitCount=btm.bmBitsPixel; #O2wyG)oU
bih.biClrImportant=0; uije#cj#O
bih.biClrUsed=0; 2v0!` &?M{
bih.biCompression=0; si_W:mLF{a
bih.biHeight=btm.bmHeight; 0U$:>bQ
bih.biPlanes=1; T vrk^!
bih.biSize=sizeof(BITMAPINFOHEADER); 4p.^'2m
bih.biSizeImage=size; ?Bo?JMV
bih.biWidth=btm.bmWidth; =43I1&_
bih.biXPelsPerMeter=0; !Y (apVQ
bih.biYPelsPerMeter=0; ze`1fO|%
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]UDd :2yt
static int filecount=0; 1EVfowIl
CString name; rh@r\H@j
name.Format("pict%04d.bmp",filecount++); Q,{^S,s<
name=m_Path+name; 4-mVB wq
BITMAPFILEHEADER bfh; \ht ?Gn
bfh.bfReserved1=bfh.bfReserved2=0; |xn#\epy@
bfh.bfType=((WORD)('M'<< 8)|'B'); 'T\dkSJv;V
bfh.bfSize=54+size; {P-xCmZ~Wt
bfh.bfOffBits=54; > 2#%$lX6
CFile bf; tR kF
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?hnx/z+uT
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); PgMbMH
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xq}-m!nX
bf.WriteHuge(lpData,size); 3UdU"d[75
bf.Close(); )zU:
nCount++; i[\w%(83Fi
} nX|Q~x]
GlobalFreePtr(lpData); Vtr3G.P^
if(nCount==1) 1BJ<m5/1%
m_Number.Format("%d picture captured.",nCount); W{
fZ[z
else H$!+A
m_Number.Format("%d pictures captured.",nCount); iv*V#J>
UpdateData(FALSE); gH[,Xx?BN!
} ^i+[m
mzWP8Hlw
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) En(7(qP6}
{ XVt/qb%)r
if(pMsg -> message == WM_KEYDOWN) 8'A72*dhX
{ ldGojnS
if(pMsg -> wParam == VK_ESCAPE) #EDEYEW7
return TRUE; |~WYEh
if(pMsg -> wParam == VK_RETURN)
.[?BlIlm
return TRUE; )tS-.P rA-
} yhpz5[AuO
return CDialog::PreTranslateMessage(pMsg); kZLMtj-
} (luKn&826
F30
]
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7{e=="#*
{ lT'9u,6
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7\ypW $Ot
SaveBmp(); y500Xs[c
return FALSE; 9xFO]Y"
} Dw_D+7>(v
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $d/&k`
CMenu pop; ecj7BT[mLI
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); pXu/(&?
CMenu*pMenu=pop.GetSubMenu(0); =wG+Ao
pMenu->SetDefaultItem(ID_EXITICON); H6K`\8/SeN
CPoint pt; c0_E_~
GetCursorPos(&pt); n((vY.NDV
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ";x+1R.d
if(id==ID_EXITICON) h1[WhBL-O
DeleteIcon(); t
P"\J(x
else if(id==ID_EXIT) ffe1lw%
OnCancel(); !2tW$BP^
return FALSE; sbj";h=E
} ]ikomCg
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }7s>B24J
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8z2Rry
w
AddIcon(); El-
? %
return res; R"AUSO|{
} ~Rpm-^
ka"337H
void CCaptureDlg::AddIcon()
?wb+L
{ WG7k(Sp]
NOTIFYICONDATA data; vUA0FoOp
data.cbSize=sizeof(NOTIFYICONDATA); D)@XoM(
CString tip; e`K)_>^n#
tip.LoadString(IDS_ICONTIP); '?QuJFki
data.hIcon=GetIcon(0); p|+B3
data.hWnd=GetSafeHwnd(); @U{<a#
strcpy(data.szTip,tip); l;A,0,i
data.uCallbackMessage=IDM_SHELL; 52_#
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5J2=`=FK
data.uID=98; /)
4GSC}Gg
Shell_NotifyIcon(NIM_ADD,&data); B,WTHU[AV
ShowWindow(SW_HIDE); tK(g-u0N`(
bTray=TRUE; bFS>)
} }8-\A7T
S6d`ioi-
void CCaptureDlg::DeleteIcon() k S#
CEU7
{ n5-)/R[z
NOTIFYICONDATA data; ^].jH+7i*
data.cbSize=sizeof(NOTIFYICONDATA); Ih}1%Jq
data.hWnd=GetSafeHwnd(); b5G}3)'w
data.uID=98; fvq,,@23
Shell_NotifyIcon(NIM_DELETE,&data); cO2& VC
ShowWindow(SW_SHOW); S~Z|PLtF
SetForegroundWindow(); :O<bA&:d
ShowWindow(SW_SHOWNORMAL); hU]HTX'R
bTray=FALSE; g*UMG>
}
+=q)
}@1q@xU
void CCaptureDlg::OnChange() ?>c=}I#Ui-
{ + @9.$6N
RegisterHotkey(); 2&PPz}Sw
} ?~"bR%
J5p"7bc
BOOL CCaptureDlg::RegisterHotkey() _@mRb^
{ Uxfl_@lJ
UpdateData(); h^9"i3H
UCHAR mask=0; "gtHTqheH
UCHAR key=0; K;hh&sTB
if(m_bControl) "xmP6=1
mask|=4; }?F`t[+
if(m_bAlt) 9E2j!
mask|=2; mR\`DltoV
if(m_bShift) FWue;pw3
mask|=1; Wz4&7KYY
key=Key_Table[m_Key.GetCurSel()]; {rfF'@[
if(bRegistered){ 3f" %G\
DeleteHotkey(GetSafeHwnd(),cKey,cMask); u]
:m"LM
bRegistered=FALSE; >d"3<S ;b
} j*"3t^|-
cMask=mask; {t"+
3zy'
cKey=key; vb 1@yQ
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )#|<w9uec
return bRegistered; l0&EZN0V2
} Jd\apBIf
e^4 p%
四、小结 :@W.K5
iv`O/T
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。