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:
,A'| Z
?r KbL^2 一、实现方法
10fxK d7Vp^^}( 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:
U$mDAi$ hw,nA2w\ #pragma data_seg("shareddata")
]XU4nNi HHOOK hHook =NULL; //钩子句柄
HdN5zl,q UINT nHookCount =0; //挂接的程序数目
VcGl8~#9 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
>ei~:z]R static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
gUNhN1= static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
G &xtL static int KeyCount =0;
eT+i& static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
yI1:L
- #pragma data_seg()
"]#Ij6ml t5%cpkgh4 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。
<4+P37^~ KF
zI27r 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:
s]%Cz \ f[1cN`|z BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
yAfwQ$Ll7 cKey,UCHAR cMask)
q[_qZ {
r[4n2Mys BOOL bAdded=FALSE;
pd:7K'yaw for(int index=0;index<MAX_KEY;index++){
"h#R>3I1) if(hCallWnd[index]==0){
Wk\(jaL% hCallWnd[index]=hWnd;
GA[Ebzi HotKey[index]=cKey;
M#;
ks9 HotKeyMask[index]=cMask;
@Wc5r# bAdded=TRUE;
]o8]b7- KeyCount++;
Bhxs(NO break;
yI 2UmhA }
3("C'(W }
n9xP8<w8
return bAdded;
Iz1x| EQ }
[a04(
2g //删除热键
`p&[b]b BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>*RU:X {
Hl`OT5pNf BOOL bRemoved=FALSE;
`*Yw-HL for(int index=0;index<MAX_KEY;index++){
l3sF/zkH if(hCallWnd[index]==hWnd){
|]4!WBK if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
\= v.$u"c hCallWnd[index]=NULL;
3Rc*vVnI HotKey[index]=0;
)[ A-d(y= HotKeyMask[index]=0;
d
#1Y^3n bRemoved=TRUE;
H"FK(N\ KeyCount--;
sqrLys_S break;
l::q
F 0 }
R3~,&ab }
B:Ts_9* }
EY )2, return bRemoved;
ZU73UL }
g%&E~V/g$ sq!$+=1-X mY.v: DLL中的钩子函数如下:
rS{}[$Zpl iX$G($[l( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
D`T;j[SsS# {
!BsQJ_H BOOL bProcessed=FALSE;
U?#wWbE1 if(HC_ACTION==nCode)
P9/ (f$ = {
|Y>Jf~SN if((lParam&0xc0000000)==0xc0000000){// 有键松开
u#,8bw?1 switch(wParam)
I.n,TJoz4J {
xvV";o case VK_MENU:
{4D`VfX_ MaskBits&=~ALTBIT;
i)?7+<X break;
SXk.7bMV6 case VK_CONTROL:
UJL2IF-x MaskBits&=~CTRLBIT;
(-gomn break;
h^SWb91"G case VK_SHIFT:
f' ?/P~[ MaskBits&=~SHIFTBIT;
Q#\Nhc break;
n9'3~qVZ default: //judge the key and send message
t>[W]%op break;
riDb!oC }
17 Ugz? for(int index=0;index<MAX_KEY;index++){
4rU/2}.q if(hCallWnd[index]==NULL)
hq
3n&/ continue;
Nap[=[rv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=6u@JpOl {
|NuMDVd+s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
~[HzGm% bProcessed=TRUE;
C|V7ZL>W }
;Z]Wj9iY }
w"v!+~/9 }
r{;NGQYs else if((lParam&0xc000ffff)==1){ //有键按下
BS9VwG<Z switch(wParam)
7%y$^B7{ {
$ln8Cpbca case VK_MENU:
BpZ~6WtBq MaskBits|=ALTBIT;
lL}NiN-)t break;
'X;cgAq8( case VK_CONTROL:
T Rv MaskBits|=CTRLBIT;
=SJ#6uFS break;
0$*7lQ<a#M case VK_SHIFT:
8K,X3a9 MaskBits|=SHIFTBIT;
h p]J>i. break;
7?*+,Fo# default: //judge the key and send message
i g(O$y break;
k =5k)}i }
50cVS)hG6d for(int index=0;index<MAX_KEY;index++){
*?FVLE if(hCallWnd[index]==NULL)
.d<K` .O; continue;
tF:AnNp= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(BEe^]f {
YvJFZ_faX SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
j'D%eQI,V bProcessed=TRUE;
WXy8<?s }
"`>6M&`U }
0P$1=oK }
8A#,*@V[ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
i#'K7XM2 for(int index=0;index<MAX_KEY;index++){
MgeC-XQM if(hCallWnd[index]==NULL)
MgXZN{ continue;
o701RG~) if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
csy6_q( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
RlOy,/-< //lParam的意义可看MSDN中WM_KEYDOWN部分
2:38CdkYp }
g(@F`W[ }
^Hx}.?1 }
ZSuoD$~k[ return CallNextHookEx( hHook, nCode, wParam, lParam );
TxJk.c }
OG5{oH#K t#^Cem< 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:
1SExlU
7kLurv BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
)ros-dp` BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Nx 42k|8
g88k@<Y 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:
jZA1fV tm~9XFQ< LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
0>28o. {
;/Hr ZhOE if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
"*bLFORkq' {
K(+=V)'Dz //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
cXq9k!I% SaveBmp();
L^JU{\C return FALSE;
QLJ\> }
]64Pk9z= …… //其它处理及默认处理
tx09B)0 }
bBi>BP= %p 6Ms s ~Eo]e 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。
k=s^-Eiu t/[2{'R4 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。
k8s)PN Cog }a 二、编程步骤
o<nM-"yWb o@)Fy51DD 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";
Ue}1(2.v 1S?~c25=h 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
*y4DK6OFe `y>m
>j 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;
u`XRgtI{g? 9K$
x2U 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;
z qA>eDx sl$6Zv-l%0 5、 添加代码,编译运行程序。
^(q .f=I!a 1UMEbb 三、程序代码
S)EF&S(TC <V^o.4mOg> ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
HM% +Y47a #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
I#OZ:g^ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
%Xc,l Y1? #if _MSC_VER > 1000
:W)lt28_ #pragma once
L(3&,!@ #endif // _MSC_VER > 1000
"]eB2k_> #ifndef __AFXWIN_H__
T6/P54S #error include 'stdafx.h' before including this file for PCH
U6-47m0% #endif
cxR.:LD} #include "resource.h" // main symbols
.rBU"Rbo class CHookApp : public CWinApp
Uh.swBC n {
;r@=[h
public:
7&id(&y/ CHookApp();
vv)q&,<c // Overrides
;pm/nu // ClassWizard generated virtual function overrides
N^QxqQ~
//{{AFX_VIRTUAL(CHookApp)
LuZlGm public:
t^&hG7L_m, virtual BOOL InitInstance();
l;q]z virtual int ExitInstance();
]Gi&:k //}}AFX_VIRTUAL
"M:ui0YP //{{AFX_MSG(CHookApp)
\`y:#N<c // NOTE - the ClassWizard will add and remove member functions here.
6$OmOCA% // DO NOT EDIT what you see in these blocks of generated code !
g%J\YRo //}}AFX_MSG
9,8/DW.K DECLARE_MESSAGE_MAP()
eBa#Z1Z };
]WNY"B>+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
lW"0fZ_x'E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
~C{:G;Iy0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
VP!4Nob BOOL InitHotkey();
S:z|"u:+ BOOL UnInit();
>$ZhhM/} J #endif
GJdL1ptc u.A}&'H //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
3/gR}\= #include "stdafx.h"
+X#6dv$ #include "hook.h"
:?UcD_F #include <windowsx.h>
g{Av
=66Z #ifdef _DEBUG
ASdW!4.p #define new DEBUG_NEW
Yz;7g8HI #undef THIS_FILE
fln[Q2zl static char THIS_FILE[] = __FILE__;
%<^^ Mw #endif
Ab[o~X" #define MAX_KEY 100
{_!,T%>+1 #define CTRLBIT 0x04
-~c-mt #define ALTBIT 0x02
F;_c x #define SHIFTBIT 0x01
</kuJh\ #pragma data_seg("shareddata")
bj`GGxzOb HHOOK hHook =NULL;
v2tVq_\AMx UINT nHookCount =0;
I:t?# )wl static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
vw>(JCR static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
jW7ffb
`O static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
&IXmy-w static int KeyCount =0;
g}R#0gkdk} static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
,|z@Dy #pragma data_seg()
`}`Q qv HINSTANCE hins;
'__>M>[ void VerifyWindow();
jv v= BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
)o:sDj`b] //{{AFX_MSG_MAP(CHookApp)
CF3x\6.q} // NOTE - the ClassWizard will add and remove mapping macros here.
Y'000#+ // DO NOT EDIT what you see in these blocks of generated code!
bp/l~h.7W //}}AFX_MSG_MAP
6|lsG6uf END_MESSAGE_MAP()
sCJ|U6Q- 8+Tv@ CHookApp::CHookApp()
T-yEn&r4) {
:@5{*o // TODO: add construction code here,
QDj%m %Xd // Place all significant initialization in InitInstance
p*<I_QM! }
/pkN=OBR (xvg.Nby CHookApp theApp;
&0f/F:M LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#|8%h {
Id^q!4Th9 BOOL bProcessed=FALSE;
;o)'dK if(HC_ACTION==nCode)
s]e`q4ip {
8pf]M& if((lParam&0xc0000000)==0xc0000000){// Key up
gFuK/]gzI switch(wParam)
&x B^ {
g?|Z/eVJ case VK_MENU:
R|}4H*N MaskBits&=~ALTBIT;
SVZ@'X\[M break;
F#yn'j8 case VK_CONTROL:
Y,L[0% MaskBits&=~CTRLBIT;
X]9<1[f break;
lH?jqp case VK_SHIFT:
q {}5wM MaskBits&=~SHIFTBIT;
3]'ab-,Vp break;
2.</n}g default: //judge the key and send message
zOA~<fhT break;
J~J+CGT~2 }
P<Z` 8a[ for(int index=0;index<MAX_KEY;index++){
&ZMQ]'& if(hCallWnd[index]==NULL)
|wJdp,q R continue;
$bp$[fX(e if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
sqpo5~ {
";`jS&"= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.fqy[qrM bProcessed=TRUE;
L'a+1O1q&i }
oCE'@}s.i }
|5`ecjb. }
W$wX[ else if((lParam&0xc000ffff)==1){ //Key down
&b^_~hB:q switch(wParam)
i,"Xw[H*s {
uWClT): case VK_MENU:
JFc,f MaskBits|=ALTBIT;
(!8b$)k break;
l'Za"TL: case VK_CONTROL:
F{QOu0$cA4 MaskBits|=CTRLBIT;
"0nsY E break;
AH/^v;- case VK_SHIFT:
[?:MIl#! MaskBits|=SHIFTBIT;
!_3b#Caf break;
Z'9 | default: //judge the key and send message
u4T$ break;
q9_AL8_ }
C7R3W, for(int index=0;index<MAX_KEY;index++)
I6;6x {
yKrbGK*=_ if(hCallWnd[index]==NULL)
BI%~0Gj8 continue;
fBZLWfp9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#?r|6<4X {
ChUE,) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
xx1l Ecj bProcessed=TRUE;
&QD)1b[U }
LHx ")H?, }
2!}F+^8'P }
3
eF c if(!bProcessed){
@=AQr4& for(int index=0;index<MAX_KEY;index++){
'MX|=K!C if(hCallWnd[index]==NULL)
!%}n9vr!}\ continue;
)M"NMUuU" if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
e <{d{ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
V,VL?J\ }
9XQE5^ }
W+u,[_ }
-0q|AB< return CallNextHookEx( hHook, nCode, wParam, lParam );
N2 3:+u<)E }
A{-S )Z3} fnr8{sr.2Z BOOL InitHotkey()
Q[#8ErUY {
3f^jy( if(hHook!=NULL){
*^g]QQ nHookCount++;
F4-rPv return TRUE;
stfniV }
ng|^Zm% else
@8`I!fZ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3B%7SX if(hHook!=NULL)
o~y{9Q nHookCount++;
oDD"h,Z return (hHook!=NULL);
!hfpa_5 }
EUI*:JU- BOOL UnInit()
(||qFu9a {
Hc<@T_h+2 if(nHookCount>1){
Q3=5q w^ nHookCount--;
y2?9pVLa\y return TRUE;
1k:yU( }
6~ y' BOOL unhooked = UnhookWindowsHookEx(hHook);
KC; o if(unhooked==TRUE){
Wk3-J&QbS nHookCount=0;
2brY\c
F hHook=NULL;
r{d@74 }
CeOA_M return unhooked;
Go:(R {P }
S9$,.aq 3)CIqN BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
aynaV {
E<! L^A
M` BOOL bAdded=FALSE;
=AzkE] for(int index=0;index<MAX_KEY;index++){
VfJ{);
if(hCallWnd[index]==0){
A9SL|9Q hCallWnd[index]=hWnd;
n2-+.9cY HotKey[index]=cKey;
ami>Pp HotKeyMask[index]=cMask;
OW=3t#"7Kp bAdded=TRUE;
g8'8"9:xC KeyCount++;
"]p&7 break;
DFZ@q=ZT }
w0nbL^f }
):tv V return bAdded;
z]%@r 7 }
Jia@HrLR {Y-'i;j? BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
kk<%VKC {
qHe
H/e%`V BOOL bRemoved=FALSE;
'^WR5P<8c for(int index=0;index<MAX_KEY;index++){
c-NUD$ if(hCallWnd[index]==hWnd){
&@{`{ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
dVMl;{ hCallWnd[index]=NULL;
Ca?w"m~h HotKey[index]=0;
sl$y&C- HotKeyMask[index]=0;
^Lfwoy7R bRemoved=TRUE;
ZBY}Mz$ KeyCount--;
L3Y2HZ break;
C^'r>0 }
2P'Vp7f6 Y }
:+QNN< }
.j,xh )v" return bRemoved;
fk?!0M6d }
X1}M_h% <W3p! void VerifyWindow()
7z, $ {
OA9P"* for(int i=0;i<MAX_KEY;i++){
91&=UUkK? if(hCallWnd
!=NULL){ M Tl
@#M
if(!IsWindow(hCallWnd)){ ^)Y3V-@t
hCallWnd=NULL; &Q"vXs6Gt
HotKey=0; Brs}
HotKeyMask=0; #k>n5cR@0
KeyCount--; Cpd>xXZz&S
} '
ZTRl+
} 0^J%&1a Ic
} 4%qmwt*p
} X1oR
s8]%L4lvu
BOOL CHookApp::InitInstance() H@zv-{}T8
{ (ESFR0
AFX_MANAGE_STATE(AfxGetStaticModuleState()); mP15PZ
hins=AfxGetInstanceHandle(); $(0<T<\
InitHotkey(); n;xzjq-
return CWinApp::InitInstance(); rttKj{7E
} (dNF)(wn
,mCf{V]#
int CHookApp::ExitInstance() IN1n^f$:
{ #2Q%sE?
VerifyWindow(); %j1 7QD8
UnInit(); |SMigSu r`
return CWinApp::ExitInstance(); #>_fYjT
} }2BNy9q@
d@*dbECG
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +N,Fq/x
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RDQ]_wsyKG
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ zn= pm#L
#if _MSC_VER > 1000 t W
#pragma once s2N'Ip
#endif // _MSC_VER > 1000 q2*)e/}H
]!P6Z?
class CCaptureDlg : public CDialog tZ@&di:-F
{ hTby:$aCg
// Construction J'=s25OWU
public: c; .y
BOOL bTray; ]moBVRd
BOOL bRegistered; p\'X%R
BOOL RegisterHotkey(); dXY}B=C
UCHAR cKey; t,XbF
UCHAR cMask; zTG1 0
void DeleteIcon(); xk8NX-:
void AddIcon(); G;t<dJ8
UINT nCount; ]+qd|}^
void SaveBmp(); Jq>5:"jZ0
CCaptureDlg(CWnd* pParent = NULL); // standard constructor p'@z}T?F
// Dialog Data :nnch?J_
//{{AFX_DATA(CCaptureDlg) (1er?4
enum { IDD = IDD_CAPTURE_DIALOG }; \KpJIHkBRy
CComboBox m_Key; <$uDN].T4
BOOL m_bControl; si]MQ\i+
BOOL m_bAlt; v/]xdP^Z
BOOL m_bShift; mpDxJk!
CString m_Path; ~]W
@+\l
CString m_Number; 066\zAPdH
//}}AFX_DATA `+TC@2-?
// ClassWizard generated virtual function overrides '{JMWNY
//{{AFX_VIRTUAL(CCaptureDlg) {~EsO1p
public: sKiy1Ww
virtual BOOL PreTranslateMessage(MSG* pMsg); 1#>uqUxah
protected: 8BS Nm
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w[QC
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Zmk 9C@
//}}AFX_VIRTUAL c(3idO*R)
// Implementation 2"Unk\Y
protected: jgpF+V-n$
HICON m_hIcon; MbTmdRf
// Generated message map functions 2Z^p)
//{{AFX_MSG(CCaptureDlg) Gh{9nM_\"
virtual BOOL OnInitDialog(); ?5pZp~
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); I7f:T N
afx_msg void OnPaint(); )&)tX.
afx_msg HCURSOR OnQueryDragIcon(); W Kd:O)J
virtual void OnCancel(); jM{5nRQ
afx_msg void OnAbout(); 4|eI_u{_
afx_msg void OnBrowse(); @Y9tkJIt
afx_msg void OnChange(); 5wvh
@Sc\
//}}AFX_MSG 9Z 6
DECLARE_MESSAGE_MAP() (8W?ym
}; pF~aR]Q
#endif }.=wQ_
R>[G6LOG
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file OCqknA
#include "stdafx.h" 5HAAa I
#include "Capture.h" /b4>0DXT5
#include "CaptureDlg.h" -"Nvu
#include <windowsx.h> X1u\si%.4S
#pragma comment(lib,"hook.lib") &,/-<y-S
#ifdef _DEBUG 1F2(MKOo!
#define new DEBUG_NEW gI Gi7x
#undef THIS_FILE KAr5>^<zw
static char THIS_FILE[] = __FILE__; 4>HQ2S{t
#endif !Xq5r8]
#define IDM_SHELL WM_USER+1 AQ"rk9Z
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gd]k3XN$f
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -gb@BIV#
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^v3J
ld
class CAboutDlg : public CDialog !.|A}8nK
{ te>Op 1R
public: x+Ly,9nc$
CAboutDlg(); RtaMrG=D
// Dialog Data \:Hh'-77q
//{{AFX_DATA(CAboutDlg) 3Z}m5f`t
enum { IDD = IDD_ABOUTBOX }; mI;\ UOh'
//}}AFX_DATA NeewV=[%
// ClassWizard generated virtual function overrides W{}M${6&
//{{AFX_VIRTUAL(CAboutDlg) 2rf#Bq?7
protected: PP6gU=9[)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '?mky,:HT
//}}AFX_VIRTUAL @_#]7
// Implementation qs
(L2'7/
protected: Nfl5tI$U:
//{{AFX_MSG(CAboutDlg) Ivq|-LDNc
//}}AFX_MSG =AuxMEg
DECLARE_MESSAGE_MAP() BUBtK-n~"3
}; ^w
jM u5f
)b|xzj @
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m\ @Q}
{ W=K+kB
//{{AFX_DATA_INIT(CAboutDlg) sg<c1
//}}AFX_DATA_INIT a7z%)i;Z
} Nqj5, 9*c
w(odgD
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .
{ Oj7).U0;#
CDialog::DoDataExchange(pDX); KM
oDcAjH
//{{AFX_DATA_MAP(CAboutDlg) zK: 2.4
//}}AFX_DATA_MAP 6ZC~q=my
} \%#luk@:
Oh7wyQiV
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Gfle"_4m8
//{{AFX_MSG_MAP(CAboutDlg) !@)tkhP
// No message handlers qi1#s,
//}}AFX_MSG_MAP X'7MW?
q@
END_MESSAGE_MAP() Q6PMRG}/o
P`n"E8"ab<
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 55Ye7P-d
: CDialog(CCaptureDlg::IDD, pParent) -wnBdL
{ PW*[(VX
//{{AFX_DATA_INIT(CCaptureDlg) 2$joM`j$
m_bControl = FALSE; ZP4y35&%y
m_bAlt = FALSE; rWuqlx#
m_bShift = FALSE; R+=Xr<`%U|
m_Path = _T("c:\\"); l27J
m_Number = _T("0 picture captured."); Lyjp
nCount=0; -
SCFWc
bRegistered=FALSE; }pT>dbZ
bTray=FALSE; @.v{hkM`
//}}AFX_DATA_INIT ].N%A07
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s#(<zBZ9p#
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 69``j{Z+
} Gwfi
'R n\CMTH
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) DV~g
{ idZ]d6
CDialog::DoDataExchange(pDX); %wmbFj}
//{{AFX_DATA_MAP(CCaptureDlg) o5w =
DDX_Control(pDX, IDC_KEY, m_Key); \r\wqz7
DDX_Check(pDX, IDC_CONTROL, m_bControl); u< 5{H='6
DDX_Check(pDX, IDC_ALT, m_bAlt); ?Aky!43
DDX_Check(pDX, IDC_SHIFT, m_bShift); ue!wo-|#G
DDX_Text(pDX, IDC_PATH, m_Path); Q~)A
fa{
DDX_Text(pDX, IDC_NUMBER, m_Number); )m10IyUAY
//}}AFX_DATA_MAP 2TX.%%Ze
} $&0\BvS
2D{`AJ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Y:5Gp8Vi
//{{AFX_MSG_MAP(CCaptureDlg) ,k6V?{ZA
ON_WM_SYSCOMMAND() #Gu(h(Z s
ON_WM_PAINT() SMHQh.O?5
ON_WM_QUERYDRAGICON() {mB &xz:b
ON_BN_CLICKED(ID_ABOUT, OnAbout) ;#dzw!+Y
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lT F#efcW
ON_BN_CLICKED(ID_CHANGE, OnChange) ' n "n;
//}}AFX_MSG_MAP \.MPjD
END_MESSAGE_MAP() >m`<AynJ
!4fT<V(
BOOL CCaptureDlg::OnInitDialog() $7&t`E)qY
{ WeS$$:ro
CDialog::OnInitDialog(); P<R'S
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); PWN$x`h g[
ASSERT(IDM_ABOUTBOX < 0xF000); @@+BPLl
CMenu* pSysMenu = GetSystemMenu(FALSE); )9V8&,
if (pSysMenu != NULL) C,dRdEB>
{ @t,Y<)U
CString strAboutMenu; ?~rz'Pu~
strAboutMenu.LoadString(IDS_ABOUTBOX); '<hgc
if (!strAboutMenu.IsEmpty()) fzjZiBK@
{ [hKt4]R
pSysMenu->AppendMenu(MF_SEPARATOR); Znh)m
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W0N*c*k
} _!E/em
} d/` d:g
SetIcon(m_hIcon, TRUE); // Set big icon r[kmgPld
SetIcon(m_hIcon, FALSE); // Set small icon 3rVWehCv
m_Key.SetCurSel(0); kntn9G
RegisterHotkey(); _{0IX
CMenu* pMenu=GetSystemMenu(FALSE); %9`\7h7K
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "5$2b>_UE
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [!>DQE
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \t' ]Lf
return TRUE; // return TRUE unless you set the focus to a control bc*CP0t|
} #TG.weTC
FK`M+ j
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l=ZX9<3
{ JReJlDu
if ((nID & 0xFFF0) == IDM_ABOUTBOX) } !RBH(m%
{ 8H2A<&3i
CAboutDlg dlgAbout; a3E.rr;b
dlgAbout.DoModal(); MDOP2y`2i
} _[ufH*
else >$N ?\\#
{ 2vX!j!_
CDialog::OnSysCommand(nID, lParam); &s_)|K
} rn%q*_3-o
} LP5@ID2G
Xe:e./@
void CCaptureDlg::OnPaint() hGlRf_{
{ ~mu)Cw
if (IsIconic()) 7&
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{ v
L!?4k
CPaintDC dc(this); // device context for painting =&v&qne9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }#QYZ nR
// Center icon in client rectangle e:zuP.R
int cxIcon = GetSystemMetrics(SM_CXICON); Q%^!j_#
int cyIcon = GetSystemMetrics(SM_CYICON); .V\:)\<|
CRect rect; Tq!.M1{&
GetClientRect(&rect); s_Gf7uC
int x = (rect.Width() - cxIcon + 1) / 2; l*>,:y
int y = (rect.Height() - cyIcon + 1) / 2; SOo}}a0
// Draw the icon YV/JZc f
dc.DrawIcon(x, y, m_hIcon); RI-)Qx&!f
} }C9P--
else Rkz[x
{ szU_,.\
CDialog::OnPaint(); ZH8Oidj`
} x"n)y1y
} &{H LYxh
<&p0:S7
HCURSOR CCaptureDlg::OnQueryDragIcon() _q 1E4z
{ '"o&BmF
return (HCURSOR) m_hIcon; g0-J8&?X
} p;YS`*!s
tAH0o\1;
void CCaptureDlg::OnCancel() W>(p4m
{ 3eJ"7sftW
if(bTray) kESnlmy@J
DeleteIcon(); t{Xf3.
CDialog::OnCancel(); g~Agy
} ,)7y?*D}
a) 5;Od
void CCaptureDlg::OnAbout() t{RdqAF
{ D0a3%LBS/2
CAboutDlg dlg; e95@4f^K2
dlg.DoModal(); !_#2$J*s^D
} S
0L"5B@
0dKi25J
void CCaptureDlg::OnBrowse() xRPUGGv
{ ]J>{ZL
CString str; vK~tgZ&
BROWSEINFO bi; \rY<DxtOq
char name[MAX_PATH]; sDzlNMr?P+
ZeroMemory(&bi,sizeof(BROWSEINFO)); v'H\KR-;
bi.hwndOwner=GetSafeHwnd(); 55]E<2't
bi.pszDisplayName=name; %_%/ym
bi.lpszTitle="Select folder"; UCF'%R
bi.ulFlags=BIF_RETURNONLYFSDIRS; %q)*8
LPITEMIDLIST idl=SHBrowseForFolder(&bi); g6Nw].{
if(idl==NULL) a2\r^fY/
return; 52>,JHq
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); K~ShV
str.ReleaseBuffer(); z9)I@P"
m_Path=str; L>Soj|WUy(
if(str.GetAt(str.GetLength()-1)!='\\') U|}Bk/0.
m_Path+="\\"; JVk"M=c
UpdateData(FALSE); -cW'g
} dpWBY3(7a
l/F'W}
void CCaptureDlg::SaveBmp() B2DWSp-8*
{ K\a=bA}DG
CDC dc; 8KhE`C9z
dc.CreateDC("DISPLAY",NULL,NULL,NULL); `oUuAL
CBitmap bm; mhZ60 RW
int Width=GetSystemMetrics(SM_CXSCREEN); {Mx3G*hr
int Height=GetSystemMetrics(SM_CYSCREEN); 8O0E;6b
bm.CreateCompatibleBitmap(&dc,Width,Height); -^+!:0';
CDC tdc; NT}r6V(Aju
tdc.CreateCompatibleDC(&dc); ~99DE78
CBitmap*pOld=tdc.SelectObject(&bm); :M'V**A(
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); tV5Uz&:b
tdc.SelectObject(pOld); I? o)X!
BITMAP btm; (#`1[n+b`x
bm.GetBitmap(&btm); v?en-,{A
DWORD size=btm.bmWidthBytes*btm.bmHeight; g8^YDrH
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qS{E+) P
BITMAPINFOHEADER bih; s#*T(pY
bih.biBitCount=btm.bmBitsPixel; [h^>Iq
(Z
bih.biClrImportant=0; mFdj+ &2\
bih.biClrUsed=0; eH9Ofhsry
bih.biCompression=0; Yf=Puy}q
bih.biHeight=btm.bmHeight; GIGC,zP@k
bih.biPlanes=1; JTn\NSa
bih.biSize=sizeof(BITMAPINFOHEADER); N
2\lBi
bih.biSizeImage=size; 8kwe ._&)
bih.biWidth=btm.bmWidth; Bw;LGEHi|
bih.biXPelsPerMeter=0; /:],bNb
bih.biYPelsPerMeter=0; l[D5JnWxt
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )lsR8Hi8
static int filecount=0; 2Yt+[T*
CString name; #ovmX
name.Format("pict%04d.bmp",filecount++); p^uX{!
name=m_Path+name; ~$\9T.tre2
BITMAPFILEHEADER bfh; Fw!TTH6l0
bfh.bfReserved1=bfh.bfReserved2=0; 6*]g~)7`Q~
bfh.bfType=((WORD)('M'<< 8)|'B'); q;<=MO/
bfh.bfSize=54+size; ,-GkP>8f(
bfh.bfOffBits=54; Ja@zeD)f"
CFile bf; wQV[ZfU^h
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ eumpNF%$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); E"l/r4*f@
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +.u)\'r;h
bf.WriteHuge(lpData,size); 1ae,s{|
bf.Close(); @ppT;9<d
nCount++; ^OWA
} '!wI8f
GlobalFreePtr(lpData); tDk !]
if(nCount==1) wVms"U.
m_Number.Format("%d picture captured.",nCount); ^UEExjf
else |{a`,%mw
m_Number.Format("%d pictures captured.",nCount); c4'k-\JvT
UpdateData(FALSE); f1_b``M
} #OT8_D
{r,MRZaa
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !lk
-MN.
{ :4V8Iz 71
if(pMsg -> message == WM_KEYDOWN) ".Q``d&X
{ bI_T\Eft
if(pMsg -> wParam == VK_ESCAPE) R
rtr\a
return TRUE; AsOkOS3
if(pMsg -> wParam == VK_RETURN) 5UgxuuP4
return TRUE; 8o SNnT
} \(db1zmS~
return CDialog::PreTranslateMessage(pMsg); xR`W9Z5
} v3ky;~ke
OdrnPo{
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?{Rv/np=F
{ N#Y|MfLc
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ c :{#H9
SaveBmp(); _3'FX#xc
return FALSE; LW$(;-rY
} T|o ]8z
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;;#_[Zl
CMenu pop; nH=8I~jp
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2`?58&
CMenu*pMenu=pop.GetSubMenu(0); ip`oL_c
pMenu->SetDefaultItem(ID_EXITICON); jrl'?`O
CPoint pt; y|7sh
GetCursorPos(&pt); ~.*G%TW &V
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); .a0]1IkatV
if(id==ID_EXITICON) $k,wA8OZ-
DeleteIcon(); A./VO
else if(id==ID_EXIT) 5>e#SW
OnCancel(); DQ86(4e*g#
return FALSE; S1Nwm?z
} 7%Q?BH7{
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,_$}>MY;
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)
4.7 PL
AddIcon(); y_7lSo8<
return res; QQPT=_P]
} Mkj`
PXRkK63
void CCaptureDlg::AddIcon() a
At<36{?
{ )#H&lH
NOTIFYICONDATA data; L^{1dVGWNa
data.cbSize=sizeof(NOTIFYICONDATA); 6Kbc:wlR
CString tip; E<~Fi.M;\
tip.LoadString(IDS_ICONTIP); o^!_S5zKe.
data.hIcon=GetIcon(0); !'jZ
!NFO
data.hWnd=GetSafeHwnd(); Xj Rk1~
strcpy(data.szTip,tip); Biva{'[m
data.uCallbackMessage=IDM_SHELL; 3hi0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; j+9;Cp]N V
data.uID=98; `Nnaw+<]
Shell_NotifyIcon(NIM_ADD,&data); =1vl-*uYh
ShowWindow(SW_HIDE); WEnI[JGe
bTray=TRUE; {PTB]D'
} L2,.af6+
Ki,SFww8r
void CCaptureDlg::DeleteIcon() +}.~"
{ vR)f'+_Nz
NOTIFYICONDATA data; s<XAH7?0
data.cbSize=sizeof(NOTIFYICONDATA); o
_G,Ph!7
data.hWnd=GetSafeHwnd(); aWCZ1F
data.uID=98; M&v;#CV
Shell_NotifyIcon(NIM_DELETE,&data); j TyR+#Wn
ShowWindow(SW_SHOW); ?^Q8#Y^M
SetForegroundWindow(); 2d# 3LnO
ShowWindow(SW_SHOWNORMAL); Q:5^K
bTray=FALSE; "K9/^S_
} aob+_9o
<l.l6okp
void CCaptureDlg::OnChange() MP3Vo|}3
{ i!a.6Gq
RegisterHotkey(); )/y7Fh
} 3 i;sB
y v58~w*"
BOOL CCaptureDlg::RegisterHotkey() mM $|cge"
{ ^ 5D%)@~
UpdateData(); ..K@'*u
UCHAR mask=0; -`8pahI
UCHAR key=0; +v.<Fw2k#
if(m_bControl) ]<xzCPB
mask|=4; B@ xjwBUk
if(m_bAlt) RDSkFK( D
mask|=2; {O=PVW2S
if(m_bShift) #aua6V!"
mask|=1; )z^NJ'v4(
key=Key_Table[m_Key.GetCurSel()]; lZr}F.7
if(bRegistered){ w!eY)p<
DeleteHotkey(GetSafeHwnd(),cKey,cMask); {M^BY,%*
bRegistered=FALSE; [KMNMg
} w:VD[\h
cMask=mask; +L,V_z
cKey=key; +7KRoF |
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;H4 s[#K
return bRegistered; !\}X?Gf
} B" 0a5-pkr
N*`qsv0
四、小结 H,3WdSL`K
K0usBA
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。