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:
dnIBAe
R?&S]?H 一、实现方法
[Q 2t,tQx GF/p|I D 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:
zRE7 w: D *LZ_ #pragma data_seg("shareddata")
]&G5/]f HHOOK hHook =NULL; //钩子句柄
?ST}0F00} UINT nHookCount =0; //挂接的程序数目
;_Rx|~!! static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
ryn) static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
HWefuj static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
}=GyBnXu static int KeyCount =0;
jZ{S{"j static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
aF;TsB #pragma data_seg()
'}rDmt~ D 1hKjB& 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。
`jZX(H G8;S`-D1a, 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:
lMm-K%(2 }zobIfIF BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
\
qs6% cKey,UCHAR cMask)
6=@n
b3D% {
I Mv^ 9T: BOOL bAdded=FALSE;
wl{p,[] for(int index=0;index<MAX_KEY;index++){
3,F/i+@ if(hCallWnd[index]==0){
+I Ze`M%n hCallWnd[index]=hWnd;
<7jb4n< HotKey[index]=cKey;
c^6`"\X^g HotKeyMask[index]=cMask;
"FXS;Jf bAdded=TRUE;
FI/YJ@21 KeyCount++;
-pD&@Wlwak break;
R_1C+ }
t~a$|(
9 }
{tT`It return bAdded;
7YN)T? }
N{`l?t0I //删除热键
M|v.5l# BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@NHRuk+ {
L$Leo6<3a BOOL bRemoved=FALSE;
z\E"={P& for(int index=0;index<MAX_KEY;index++){
<zf+Ii1:, if(hCallWnd[index]==hWnd){
N*SgP@Bt if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
QlS5B.h, hCallWnd[index]=NULL;
p;7 4+q HotKey[index]=0;
PPqTmx5S HotKeyMask[index]=0;
<bx9;1C>zd bRemoved=TRUE;
d=#p w*w KeyCount--;
KJ)nGoP> break;
n>E*g|a }
fD~!t 8J }
C}h@ El }
NI1HUUZz return bRemoved;
bF KPV%` }
@|GeR [[e |GQ (v`;ym DLL中的钩子函数如下:
.?p}: +r0eTP=zf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
F3Y>hs):7 {
BY0|exW BOOL bProcessed=FALSE;
)KqR8UO if(HC_ACTION==nCode)
f^)uK+:. {
'!-? if((lParam&0xc0000000)==0xc0000000){// 有键松开
B\_u${C switch(wParam)
7rSUSra {
^-IsK#r.k case VK_MENU:
Is@a,k MaskBits&=~ALTBIT;
O^}v/}d break;
7I(t,AKJ case VK_CONTROL:
V./w06;0 MaskBits&=~CTRLBIT;
{%_j~ break;
Ys$YI{ case VK_SHIFT:
Uk:.2%S2 MaskBits&=~SHIFTBIT;
"rGOw'!q> break;
!/}FPM_ default: //judge the key and send message
,%h!% nz! break;
.gN$N=7< }
HqdJdWl#" for(int index=0;index<MAX_KEY;index++){
z"K(
bw6 if(hCallWnd[index]==NULL)
ey)u7-O continue;
WkaR{{nM if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
f9,EWuQNS {
HB7( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
z8[H:W#G bProcessed=TRUE;
V+qJrZ,i }
]1?=jlUl }
{KDgK }
"W@XP+POAY else if((lParam&0xc000ffff)==1){ //有键按下
/u)Rppu switch(wParam)
lKEX"KQ! {
s^>lOQ= case VK_MENU:
zq;DIWPIoJ MaskBits|=ALTBIT;
Px?Ao0)Z, break;
*v
rWA case VK_CONTROL:
'e]HP-Y< MaskBits|=CTRLBIT;
Vf0fT?/K break;
xHB/]Vd- case VK_SHIFT:
h}|6VJ@. MaskBits|=SHIFTBIT;
MCeu0e^) break;
BF36V\ default: //judge the key and send message
B:-U`CHHQ break;
A)Qh }
1TNz&=e for(int index=0;index<MAX_KEY;index++){
i-,D_ if(hCallWnd[index]==NULL)
X0WNpt&h continue;
5g``30:o if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\Mb(6~nC {
k&)K( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
ZBX bProcessed=TRUE;
>5;N64]!) }
\+k, :8s/ }
rH_Jh}Y }
~BZXt7DE if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
gYatsFyL for(int index=0;index<MAX_KEY;index++){
5`{vE4A]q if(hCallWnd[index]==NULL)
X>8-`p continue;
e?V,fzg if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
bj@xqAGl SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
yl-fbYH //lParam的意义可看MSDN中WM_KEYDOWN部分
Ly9Q}dL }
lhqQCV }
k(P3LJcYQ }
)Zas
x6` return CallNextHookEx( hHook, nCode, wParam, lParam );
vwKw?Z0%J }
~,ynJ]_aJB W`$[j0 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:
&hayR_F9 %3M95UZ2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-!cIesK;< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Dl%?OG< %[wTz$S" 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:
=7 VCtd/ M>T[!*nTj LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
IAI(Ix {
GR%{T'ZD` if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
}W$8M>l {
f=o4I2Y[ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
nq'M?c#E SaveBmp();
-Q$b7*"z( return FALSE;
'M8aW!~ }
66Gx.tE …… //其它处理及默认处理
,/&Z3e }
/7gi/uh~-( T~X41d\ WmNYO,> 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。
-`7$Qu2 VD$Eb 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。
L/?]^!. <Ct_d
Cc 二、编程步骤
+8AvTSgX% ~*}$>@f{[X 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";
>)Gd:636+ F;u_7OM 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
]p]UTCo!' #Fs|f3-@ 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;
YT=eVg53 aMTFW_w 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;
} ptMjT{9 UTCzHh1 5、 添加代码,编译运行程序。
y-9+a7j y-B=W]E 三、程序代码
51 b y 2z_2.0/3 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
XE rUS80 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\Q&,ISO\ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
VWi2(@R^ #if _MSC_VER > 1000
SfB8!V|; #pragma once
pQWHG#?7 #endif // _MSC_VER > 1000
CQ^3v09N;~ #ifndef __AFXWIN_H__
E0 l_-- #error include 'stdafx.h' before including this file for PCH
-5bA
$ #endif
"A3dvr #include "resource.h" // main symbols
2e1]}wlK class CHookApp : public CWinApp
[}2Z/
{
GABQUmtH public:
{fDTSr?/ CHookApp();
U \oy8FZ // Overrides
g|%L"-%gJ // ClassWizard generated virtual function overrides
#=,imsW) //{{AFX_VIRTUAL(CHookApp)
D WiBG public:
H !)=y virtual BOOL InitInstance();
+K~NV?c virtual int ExitInstance();
Ev9> @~^ //}}AFX_VIRTUAL
jqnCA<G~B- //{{AFX_MSG(CHookApp)
}< 5F // NOTE - the ClassWizard will add and remove member functions here.
+wO#'D // DO NOT EDIT what you see in these blocks of generated code !
o[\HOe~; //}}AFX_MSG
1(#;&:$`i DECLARE_MESSAGE_MAP()
?1I GYyu! };
kkCZNQ~I LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
BiwieF4x BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ZcE_f>KV BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
sLL7]m} BOOL InitHotkey();
T7*wS#z)h BOOL UnInit();
1B=>_3_ #endif
ExBUpDQc {QAv~S>4 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
39i9wrP #include "stdafx.h"
/+]s.V. #include "hook.h"
,e722wz #include <windowsx.h>
G}d-(X #ifdef _DEBUG
p#P~Q/; #define new DEBUG_NEW
]< l6s #undef THIS_FILE
:[l\@>H1tX static char THIS_FILE[] = __FILE__;
/ |r' #endif
u{<"NR h #define MAX_KEY 100
G3i !PwW #define CTRLBIT 0x04
=='Td[ #define ALTBIT 0x02
}T2xXbU #define SHIFTBIT 0x01
)!bUR\ #pragma data_seg("shareddata")
%r\n%$@_ HHOOK hHook =NULL;
56lCwXCgA UINT nHookCount =0;
0|4%4Mt static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
&)d$t'7p static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
df}r% i static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Vv.r8IGYm static int KeyCount =0;
n.MRz WJpZ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
"p&Y^] #pragma data_seg()
d[^KL;b?6 HINSTANCE hins;
x&sI=5l void VerifyWindow();
))kF<A_MK BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
r|Z3$J{^" //{{AFX_MSG_MAP(CHookApp)
!LMN[3M_ // NOTE - the ClassWizard will add and remove mapping macros here.
.T<=z // DO NOT EDIT what you see in these blocks of generated code!
{6;9b-a] //}}AFX_MSG_MAP
8H,4kY?Z END_MESSAGE_MAP()
jd]s<C3o 2"P99$" CHookApp::CHookApp()
}"vW4 {
V]OmfPve // TODO: add construction code here,
>2$5eI // Place all significant initialization in InitInstance
J?@DGp+t }
GcIDG`RX 6fH@wQ"wN CHookApp theApp;
p^<yj0Y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
y.5/?{GL {
Ars687WB BOOL bProcessed=FALSE;
T{wpJ"F5<] if(HC_ACTION==nCode)
4
%PfrJ {
>z;[2n' if((lParam&0xc0000000)==0xc0000000){// Key up
gTgMqvt switch(wParam)
Nk=JBIsKv {
WARb"8Kg case VK_MENU:
T{V/+RM MaskBits&=~ALTBIT;
bmN q[} break;
IEKU-k7}Z case VK_CONTROL:
C{sLz9 MaskBits&=~CTRLBIT;
GoA4f3 break;
5>3}_ case VK_SHIFT:
5w %_$x MaskBits&=~SHIFTBIT;
]{"Br$ break;
`U+l?S^$ default: //judge the key and send message
}kw/W#)J break;
f|^dD` }
4h@Z/G!T3 for(int index=0;index<MAX_KEY;index++){
JnHo 9K2. if(hCallWnd[index]==NULL)
q@b|F- continue;
VrZ>bma; if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
lb'GXd % {
uwRr LF SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&]
\X]p bProcessed=TRUE;
T+N|R }
DI!V^M[~u }
2H.654 }
/C/id)h> else if((lParam&0xc000ffff)==1){ //Key down
jiF?fX@ switch(wParam)
wApMzZ(X2y {
LL|7rS|o case VK_MENU:
jV(6>BAI_ MaskBits|=ALTBIT;
n@ w^V break;
gM [w1^lj case VK_CONTROL:
5{n*"88 MaskBits|=CTRLBIT;
piU/& break;
_+
.\@{c case VK_SHIFT:
&$`yo` MaskBits|=SHIFTBIT;
{.yStB.T break;
/y^7p9Z` default: //judge the key and send message
Oy 2+b1{ break;
'#(v=|J }
Q}S_%I}u: for(int index=0;index<MAX_KEY;index++)
k</%YKk {
_|"Y]:j_ if(hCallWnd[index]==NULL)
$lhC{&tBV continue;
e^lWR] v if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~G27;Npy {
w[6J
` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%Th>C2\ bProcessed=TRUE;
-Ij& }
V7TVt,-3 }
' oFxR003 }
gocrjjAHk if(!bProcessed){
Jvun?J
m for(int index=0;index<MAX_KEY;index++){
Fu^^i& if(hCallWnd[index]==NULL)
S$2b>#@UJ continue;
W+*5"h if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
+:3* SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\;rYo.+ }
;(}V"i7Hu }
CR2_;x:0 }
nI0[;'Hn, return CallNextHookEx( hHook, nCode, wParam, lParam );
[b:e:P 2 }
+nQw?'9Z z"*/mP2 BOOL InitHotkey()
~^+0 {
]tY
^0a if(hHook!=NULL){
r=c<--_@ nHookCount++;
Qv-@Zt!8 return TRUE;
fAB e }
Py{<bd else
HNL42\Kz! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
)/t?!T.[ if(hHook!=NULL)
t\$U`V) nHookCount++;
k? Xc return (hHook!=NULL);
~n}k\s~|4 }
L],f3< BOOL UnInit()
:6q]F<oK {
V34hFa if(nHookCount>1){
.G o{1[ nHookCount--;
UJs$q\#RO return TRUE;
?aW^+3i }
4~U'TE
@ BOOL unhooked = UnhookWindowsHookEx(hHook);
!a$ D4(`v if(unhooked==TRUE){
$4MrP$4TI nHookCount=0;
fh^lO ^ hHook=NULL;
HHjt/gc}` }
s}onsC return unhooked;
Cye$H9 2 }
-uh(?])H qaim6a BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
NzKUtwnIz {
. @Ut?G BOOL bAdded=FALSE;
lO:.OZu for(int index=0;index<MAX_KEY;index++){
2DD:~Tbi if(hCallWnd[index]==0){
8>/Q1(q0 hCallWnd[index]=hWnd;
1
y}2+Kk HotKey[index]=cKey;
8.bKb<y HotKeyMask[index]=cMask;
7=]i~7uy bAdded=TRUE;
+\Q?w?DE| KeyCount++;
-*2Mf Mh break;
c#N<"cy> }
HG'{J ^t }
1}ZKc=Pfu return bAdded;
Yl;^ k0ZI }
}IEbyb zY+Fl~$S BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
{K#NB_*To {
.}')f;jH5< BOOL bRemoved=FALSE;
W0jZOP5_.$ for(int index=0;index<MAX_KEY;index++){
4(l?uU$ if(hCallWnd[index]==hWnd){
C6_@\&OA if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
`bKA+c,f hCallWnd[index]=NULL;
_ .i3,-l) HotKey[index]=0;
VGL#!4wK HotKeyMask[index]=0;
]\RRqLDzkg bRemoved=TRUE;
P\CDd=yWc KeyCount--;
VCy5JH break;
gfU-"VpHE }
pS 4&w8s }
eK /?%t }
(eCFWmO return bRemoved;
ZV}X'qGaq }
nxQ?bk}*d #sKWd void VerifyWindow()
1r r@ {
Q
'(ihUq*k for(int i=0;i<MAX_KEY;i++){
*s}|Hy if(hCallWnd
!=NULL){ g=}v>[k E
if(!IsWindow(hCallWnd)){ 04!(okubyp
hCallWnd=NULL; O$`UCq
HotKey=0; *p ? e.%nd
HotKeyMask=0; Q Z8QQ`*S
KeyCount--; f]~c)P
Cs
} tNs~M4TVVH
} ?(KvQK|d4
} O\;= V`z-
} #iSFf
]Pn!nSg
BOOL CHookApp::InitInstance() P4
ul[zZ
{ RK9>dkW
AFX_MANAGE_STATE(AfxGetStaticModuleState()); I.}1JJF*
hins=AfxGetInstanceHandle(); z}}]jR\y?
InitHotkey(); g(0;[#@
return CWinApp::InitInstance(); X_; *`,<T
} dw@E)
.
,NB( s`
int CHookApp::ExitInstance() ;~HNpu$
{ 'Tb0-1S?
VerifyWindow(); 71B3a
UnInit(); w#PZu+
return CWinApp::ExitInstance(); #_Ea[q7v
} 0rMqWP
o%(bQV-T
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +?-qfp,:0
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <D /a l9
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1q~LA[6
#if _MSC_VER > 1000 SqB/4P
#pragma once {ctwo X[;
#endif // _MSC_VER > 1000 RJJ1
d
O
A%F$Mk
class CCaptureDlg : public CDialog ;:#U6?=t
{ G_oX5:J*
// Construction GXb47_b^
public: }X1.Wt=?
BOOL bTray; %= u/3b:o
BOOL bRegistered; m^$5K's&
BOOL RegisterHotkey(); gn5% F5W
UCHAR cKey; |1V2tx
UCHAR cMask; *8!w&ME+.
void DeleteIcon(); Gj6. Iv
void AddIcon(); nTZ> |R)
UINT nCount; n85r^W
void SaveBmp(); F/<qE!(
CCaptureDlg(CWnd* pParent = NULL); // standard constructor yKDZ+3xK]
// Dialog Data 8$ DwpJ
//{{AFX_DATA(CCaptureDlg) M'u=H
enum { IDD = IDD_CAPTURE_DIALOG }; g3rRhS
CComboBox m_Key; QFzFL-H~N
BOOL m_bControl; %_tk7x
BOOL m_bAlt; q:yO92Ow
BOOL m_bShift; 4;\Y?M}g?
CString m_Path; kME^tpji
CString m_Number; vvh.@f
//}}AFX_DATA b7'F|h^
// ClassWizard generated virtual function overrides }J;~P
9Y
//{{AFX_VIRTUAL(CCaptureDlg) PPgW
^gj
public: )VY10R)$
virtual BOOL PreTranslateMessage(MSG* pMsg); u{+!&
2}k
protected: D Q 5W6W
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q [:<S/w
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #NJ<[Gew
//}}AFX_VIRTUAL t&pGQ
// Implementation ;Id"n7W
protected: 6H6Law!)
HICON m_hIcon; @Z=wE3T@
// Generated message map functions [0(mFMC`
//{{AFX_MSG(CCaptureDlg) =AzOnXW:S
virtual BOOL OnInitDialog(); S~|tfJpL
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); OequU'j
afx_msg void OnPaint(); t[ q3{-
afx_msg HCURSOR OnQueryDragIcon(); ~,G]glu8
virtual void OnCancel(); Cg*kN"8q
afx_msg void OnAbout(); |YXG(;-BS
afx_msg void OnBrowse(); U2=hSzY
afx_msg void OnChange(); 0/*X=5
//}}AFX_MSG CwB] )QV?
DECLARE_MESSAGE_MAP() :P"9;$FY
}; rxArTpS{.#
#endif DzE E:&*=
bx]14}6
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ja:\W\xhJ
#include "stdafx.h" v'$ykZ!Z
#include "Capture.h" 5Ny0b|+p
#include "CaptureDlg.h" ? 9qAe
#include <windowsx.h> X)y*#U
#pragma comment(lib,"hook.lib") I'P.K| "R
#ifdef _DEBUG 4(;20(q]
#define new DEBUG_NEW wV?[3bEhM
#undef THIS_FILE wb@]>MJ}[s
static char THIS_FILE[] = __FILE__; " _mmR
M
#endif hPS/CgLq
#define IDM_SHELL WM_USER+1 o`25
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %"{?[!C ?
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4bWfx_0W
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?!rU
|D
class CAboutDlg : public CDialog :> x:(K
{ }&=uZ:
public: cFe V?a
CAboutDlg(); @RQ+JYQi
// Dialog Data "hz>{oe
//{{AFX_DATA(CAboutDlg) Cnk#Ioz
enum { IDD = IDD_ABOUTBOX }; (1OW6xtfG
//}}AFX_DATA #dL5x{gV=
// ClassWizard generated virtual function overrides I<IC-k"Y
//{{AFX_VIRTUAL(CAboutDlg) hLCsQYNDU
protected: $]xE$dzJ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6_x}.bkIx=
//}}AFX_VIRTUAL ^"PfDTyA
// Implementation l A 0-?k
protected: |)~Ex 9%ev
//{{AFX_MSG(CAboutDlg) /YS@[\j4
//}}AFX_MSG hYs82P|2Ol
DECLARE_MESSAGE_MAP() &9S8al
8"
}; Zjw!In|vC
pW`ntE#L
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &E} I
{ 0-6:AHix
//{{AFX_DATA_INIT(CAboutDlg) HCI'q\\
//}}AFX_DATA_INIT 8') .ohD
} ~5x4?2
g/fp45s
void CAboutDlg::DoDataExchange(CDataExchange* pDX) : Bdi pc
{ 3U :YA&K(
CDialog::DoDataExchange(pDX); 7Y$4MMNQ
//{{AFX_DATA_MAP(CAboutDlg) ay!6T`U`
//}}AFX_DATA_MAP liBAJx
} BT
y]!%r'
gPF}aaB6
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) tg4LE?nv
//{{AFX_MSG_MAP(CAboutDlg) S,ouj;B
// No message handlers (CKhY~,/u
//}}AFX_MSG_MAP (,d4"C
END_MESSAGE_MAP() :mCw.Jz<h
<(u3+`f1s
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }z9I`6[
: CDialog(CCaptureDlg::IDD, pParent) +xoyKP!
{ c+)36/; X
//{{AFX_DATA_INIT(CCaptureDlg) ~Hp#6+
m_bControl = FALSE; Gd]5xl
HRU
m_bAlt = FALSE; Huc3|~9
m_bShift = FALSE; yBXkN&1=%;
m_Path = _T("c:\\"); Zi2Eu4p l{
m_Number = _T("0 picture captured."); 1Ovx$*
nCount=0; op.PS{_t
bRegistered=FALSE; 'PmHBQvt&
bTray=FALSE; 8.q13t!D
//}}AFX_DATA_INIT jWO&SW so
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sp=7Kh?|>
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F1{?]>G
} U#UVenp@
)eTnR:=
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X$j|/))
{ eE#81]'6a
CDialog::DoDataExchange(pDX); gnKU\>2k
//{{AFX_DATA_MAP(CCaptureDlg) (F4d Fh
DDX_Control(pDX, IDC_KEY, m_Key); vMW-gk
DDX_Check(pDX, IDC_CONTROL, m_bControl); M;S-ESQ
DDX_Check(pDX, IDC_ALT, m_bAlt); sTYuwna~
DDX_Check(pDX, IDC_SHIFT, m_bShift); (|ct`KU0#
DDX_Text(pDX, IDC_PATH, m_Path); o%N0K
DDX_Text(pDX, IDC_NUMBER, m_Number); N~Sue
//}}AFX_DATA_MAP mTb2d?NS
} Zo}\gg3
7DHT)9lD/
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }{w_>!ee
//{{AFX_MSG_MAP(CCaptureDlg) |+$j(YuH
ON_WM_SYSCOMMAND() F_M~!]<na
ON_WM_PAINT() ~YT>:Np
ON_WM_QUERYDRAGICON() o<Rxt
*B
ON_BN_CLICKED(ID_ABOUT, OnAbout) -V<=`e
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) B9;,A;E};
ON_BN_CLICKED(ID_CHANGE, OnChange) ?SsRN jeL
//}}AFX_MSG_MAP x/jN&;"/
END_MESSAGE_MAP() zvQ^f@lq2
rTH[?mkf4
BOOL CCaptureDlg::OnInitDialog() MR l*rK
{ 2}xFv2X
CDialog::OnInitDialog(); ,{mf+ 3&$,
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u_/OTy
ASSERT(IDM_ABOUTBOX < 0xF000); q%=7<( w
CMenu* pSysMenu = GetSystemMenu(FALSE); 7$d c?K
if (pSysMenu != NULL) nF!_q;+Vp
{ :xUl+(+
CString strAboutMenu; {$QF*j
strAboutMenu.LoadString(IDS_ABOUTBOX); iR}i42Cu
if (!strAboutMenu.IsEmpty()) 2M(PH]D
{ h+'eFAZ
pSysMenu->AppendMenu(MF_SEPARATOR); krnk%ug
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {i7Fu+xZj
} !A^w6Q;`V
} RxDxLU2kt
SetIcon(m_hIcon, TRUE); // Set big icon r@@eC['
SetIcon(m_hIcon, FALSE); // Set small icon %RD7=Z-z
m_Key.SetCurSel(0); Jv{"R!e"P
RegisterHotkey(); ]zR;%p
CMenu* pMenu=GetSystemMenu(FALSE); ,;ruH^
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Er+3S@sfq,
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fOjt` ~ToI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #/sE{jm
return TRUE; // return TRUE unless you set the focus to a control [Jh))DIx
} Vi-!E
ujHzG}2z
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .gsu_N_v
{ "E[*rnsLN
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ZzaW@6LJF
{ j]F3[gpc
CAboutDlg dlgAbout; Q_|S^hxQ
dlgAbout.DoModal(); Va[dZeoy
} aKU8"
5
else }PD(kk6fX
{ J<:D~@qq
CDialog::OnSysCommand(nID, lParam); ,xM*hN3A
} i$<v*$.o
} nsw8[pk
i@?<]n
void CCaptureDlg::OnPaint() f7AJSHe
{ &IPK5o,
if (IsIconic()) yT9RNo/w
{ GQAg
ex)D
CPaintDC dc(this); // device context for painting BCDf9]X
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vh3iu+
// Center icon in client rectangle IG@&l0ARL
int cxIcon = GetSystemMetrics(SM_CXICON); iP\&fZY_
int cyIcon = GetSystemMetrics(SM_CYICON); "YU~QOGx@
CRect rect; FJH8O7
GetClientRect(&rect); k yA(m;r
int x = (rect.Width() - cxIcon + 1) / 2; %iFIY=W
int y = (rect.Height() - cyIcon + 1) / 2; e$|)wOwU
// Draw the icon .Eyk?"^
dc.DrawIcon(x, y, m_hIcon); z`{zqP:
} e~[z]GLO%
else (w
{ KvOI)"0(
CDialog::OnPaint(); f3B8,>
} wDY7B
} tdK^X1
:u+#:8u
HCURSOR CCaptureDlg::OnQueryDragIcon() 9uoj3Rh<
{ 5!fW&OiY
return (HCURSOR) m_hIcon; ITPpT
} &Y2P! \\2
l:}4
6%
void CCaptureDlg::OnCancel() ee[NZz
{ [,X,2
if(bTray) Upen/1 bA
DeleteIcon(); U MIZ:*j
CDialog::OnCancel(); .Q@'O b`
} ?E@[~qq_
&h[}5
void CCaptureDlg::OnAbout() ^PpFI
{ Mc^7FWkw
CAboutDlg dlg; f_Bf}2Eedj
dlg.DoModal(); W4Q]<<6&
} be@uHikp;v
^Z+D7Q
void CCaptureDlg::OnBrowse() )S?}huX
{ w+P^c|
CString str; I ^92b
BROWSEINFO bi; $4,6&dwg
char name[MAX_PATH]; >Sah\u`
ZeroMemory(&bi,sizeof(BROWSEINFO)); Okc*)crw
bi.hwndOwner=GetSafeHwnd(); ?Qk#;~\yB
bi.pszDisplayName=name; !%9I%Ak^
bi.lpszTitle="Select folder"; S45_-aE
bi.ulFlags=BIF_RETURNONLYFSDIRS; Z8UM0B=i
LPITEMIDLIST idl=SHBrowseForFolder(&bi); v:;cTX=x`#
if(idl==NULL) G$<0_0GF
return; H:6$)#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); INpub5
str.ReleaseBuffer(); _r'M^=yx[
m_Path=str; {Wo7=aR
if(str.GetAt(str.GetLength()-1)!='\\') #m>mYp8E.5
m_Path+="\\"; \>k+Oyj
UpdateData(FALSE); BZ9iy~
} Q8i6kf!
@Iu-F4YT
void CCaptureDlg::SaveBmp() lX3h'h
{ pM3BBF%
CDC dc; ]9Hy
"#Fz
dc.CreateDC("DISPLAY",NULL,NULL,NULL); F)Lbr>H?I
CBitmap bm; /G ;yxdb
int Width=GetSystemMetrics(SM_CXSCREEN); !)34tu2
int Height=GetSystemMetrics(SM_CYSCREEN); _!zY(9%
bm.CreateCompatibleBitmap(&dc,Width,Height); +&@0;zSga
CDC tdc; 3I+pe;
tdc.CreateCompatibleDC(&dc); `Fj(g!`
CBitmap*pOld=tdc.SelectObject(&bm); 2wCRT}C
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5FxU=M1gF
tdc.SelectObject(pOld);
~A/_\-
BITMAP btm; 3
6
;hg#
bm.GetBitmap(&btm); AK
HH{_
DWORD size=btm.bmWidthBytes*btm.bmHeight; }T,uw8?f!
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O;2 u1p'iP
BITMAPINFOHEADER bih; 3QpTO,
bih.biBitCount=btm.bmBitsPixel; /Ny&;Y
bih.biClrImportant=0; o6 /?WR 9
bih.biClrUsed=0; @d\F; o<
bih.biCompression=0; jPfoI-
bih.biHeight=btm.bmHeight; tF|bxXsZ
bih.biPlanes=1; PW}.`
bih.biSize=sizeof(BITMAPINFOHEADER); PBmt.yF
bih.biSizeImage=size; (yfTkBy
bih.biWidth=btm.bmWidth; c+JlM1p@
bih.biXPelsPerMeter=0; AN@Vos
Cu
bih.biYPelsPerMeter=0; w8qI7/
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J}JnJV8|G
static int filecount=0; K_i2%t3
CString name; \cG'3\GI
name.Format("pict%04d.bmp",filecount++); qb Q> z+c
name=m_Path+name; y_6HQ:
BITMAPFILEHEADER bfh; rfjQx]3pB
bfh.bfReserved1=bfh.bfReserved2=0; PsLCO(26
bfh.bfType=((WORD)('M'<< 8)|'B'); U:Y?2$#
bfh.bfSize=54+size; L" o6)N
bfh.bfOffBits=54; ;c`B'
CFile bf; QU t!fF@t
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ZU`"^FQ3A
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); X\;y;pmRH
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mS0W@# |K
bf.WriteHuge(lpData,size); %9j]N$.V
bf.Close(); 6
Qmtb2
nCount++; du !.j
} FB@G.f
GlobalFreePtr(lpData); /vu7;xVG
if(nCount==1) PF.HYtZqK
m_Number.Format("%d picture captured.",nCount); fRiHs\+
else {?8rvAjY
m_Number.Format("%d pictures captured.",nCount); 99`xY$
UpdateData(FALSE); e*tOXXY1
} w"~T5%p
]?^mb n
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) FX{Sb"
{ )lZb=t
if(pMsg -> message == WM_KEYDOWN) Pu=YQ
#F'
{ FGC[yz1g:
if(pMsg -> wParam == VK_ESCAPE) F
J)la9
return TRUE; n}"MF>zDK
if(pMsg -> wParam == VK_RETURN) hQ9VcS6=gD
return TRUE; hGsYu )
} }q^CR(h (R
return CDialog::PreTranslateMessage(pMsg); V[~/sc )
} (uSfr]89'
d4lEd>Ni
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .mMM]*e[0
{ !( /dbHB
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ).\%a
h
SaveBmp(); L~\Ir
return FALSE; 2gA6$s7
} `U(FdT
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uKK+V6}!kj
CMenu pop; [j):2
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zMtx>VI
CMenu*pMenu=pop.GetSubMenu(0); <%!EI@N
pMenu->SetDefaultItem(ID_EXITICON); 7"1M3P5*8
CPoint pt; XOU
9r(
GetCursorPos(&pt); {D$+~lO
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hDCR>G
if(id==ID_EXITICON) p~qdkA<
DeleteIcon(); 3= PRe
else if(id==ID_EXIT) 3:s!0ty"
OnCancel(); O.i.<VD7
return FALSE; 0`:0m/fsU
} arm26YA-,
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5LR
k)@t
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u{J$]%C
AddIcon(); W2'u]1bs
return res; tmKHT
} }gete'I
wZ0RI{)s'
void CCaptureDlg::AddIcon() `fS$@{YI_
{ Kqm2TMO]>V
NOTIFYICONDATA data; @kd`9Yw
data.cbSize=sizeof(NOTIFYICONDATA); jBb:)
CString tip; qx|~H'UuBN
tip.LoadString(IDS_ICONTIP); pC^d-Ii
data.hIcon=GetIcon(0); K|]/BjB/
data.hWnd=GetSafeHwnd(); n&1q*
strcpy(data.szTip,tip); :<hM@>eFn
data.uCallbackMessage=IDM_SHELL; {\hjKP
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =bgWUu\F
data.uID=98; #Pt_<?JtV
Shell_NotifyIcon(NIM_ADD,&data); tnE),
ShowWindow(SW_HIDE); Q`kV|
pjg
bTray=TRUE; H%pD9'q~
} DaP,3>M
42M_ %l_
void CCaptureDlg::DeleteIcon() F/V-@SF
{ @CMEmgk~
NOTIFYICONDATA data; T[Lz4;TRk5
data.cbSize=sizeof(NOTIFYICONDATA); V/`vX;%
data.hWnd=GetSafeHwnd(); (1 (~r"4I
data.uID=98; 6%it`A8}
Shell_NotifyIcon(NIM_DELETE,&data); M0yv=g
ShowWindow(SW_SHOW); &+ "<ia(
SetForegroundWindow(); xpX<iT>5u
ShowWindow(SW_SHOWNORMAL); ;* QK^ #
bTray=FALSE; ~[%_]/#&%z
} PriLV4?
{7jl) x3l
void CCaptureDlg::OnChange() ":0u%E?s
{ {xx}xib3
RegisterHotkey(); v*[UG^+)
} O uNPD q%
4%2APvLW
BOOL CCaptureDlg::RegisterHotkey() Idb*,l|<
{ DQ(0:r
UpdateData(); w?>f:2(=[
UCHAR mask=0; C$q};7b1N
UCHAR key=0; XLC9B3Jt
if(m_bControl) )X?oBNsj
mask|=4; f"RC(("6W
if(m_bAlt) /5)*epF+
mask|=2; ynv{
rMl
if(m_bShift) l]4=W<N
mask|=1; WG A1XQ{
key=Key_Table[m_Key.GetCurSel()]; /v^'5j1o
if(bRegistered){ [0EWIdT*b
DeleteHotkey(GetSafeHwnd(),cKey,cMask); (P`=9+
bRegistered=FALSE; JcUU#>
} 0KnL{Cj
cMask=mask; j*@@H6G
cKey=key; ]Cj@",/3#
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?V,q&=9
return bRegistered; w%.hALN5-C
} XjF@kQeM=
arDl2T,igF
四、小结 GQ;0KIN
O`c+y
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。