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:
M1\/ueOe
efm<bJB2 一、实现方法
F*u;'K ponvi42u 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:
~{{:-XkVB \U8Vsx1tl #pragma data_seg("shareddata")
A5\S0l$Q HHOOK hHook =NULL; //钩子句柄
chbs9y0 UINT nHookCount =0; //挂接的程序数目
+/'jX?7x% static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
/PlsF static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
75ob1h" static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
,\IZ/1 static int KeyCount =0;
ce\-oT static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
#(G&%I A|; #pragma data_seg()
Zl*!pQ N:.bnF( 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。
fAi113q! jXQ_7 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:
/zM7G?y Uw!v=n3#! BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
fyeS) cKey,UCHAR cMask)
bC|~N0b {
r` @Dgo} BOOL bAdded=FALSE;
ub&1L_K for(int index=0;index<MAX_KEY;index++){
`y(3:##p if(hCallWnd[index]==0){
hkY E7 hCallWnd[index]=hWnd;
A
[JV*Dt HotKey[index]=cKey;
MvCBgLN HotKeyMask[index]=cMask;
_rv_-n]"o bAdded=TRUE;
?5D7n"jY KeyCount++;
K;~dZ break;
5sH ee, }
IM+PjYJ }
G[mYx[BTz return bAdded;
^AN9m]P }
\[BnAgsF //删除热键
9bB~r[k BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
7%tn+ {
[,c>-jA5 BOOL bRemoved=FALSE;
Tr8+E;; for(int index=0;index<MAX_KEY;index++){
5BZ5Gl3 if(hCallWnd[index]==hWnd){
`'/8ifKz if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)-mB^7uXGv hCallWnd[index]=NULL;
4d#W[ HotKey[index]=0;
ZO,]h9?4 HotKeyMask[index]=0;
-(jcsqDk bRemoved=TRUE;
LakP'P6`E KeyCount--;
? DPL7 break;
^l9S5
{ }
B\6\QQ;rUo }
5Z@Q^ }
xn-n{U" return bRemoved;
8ydOS }
J-U}iU| (efH>oY[ \Tc$P# DLL中的钩子函数如下:
uwbj`lpf pCq{F*; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
_jtBU {
j8lbn |. BOOL bProcessed=FALSE;
6wGf47 if(HC_ACTION==nCode)
# RtrHm {
j9Lc2' if((lParam&0xc0000000)==0xc0000000){// 有键松开
EfOJ%Xr[,l switch(wParam)
m^wYRA. {
p%}oo#%J case VK_MENU:
noacnQ_I$ MaskBits&=~ALTBIT;
!Ed';yfz\( break;
)msqt!Ev case VK_CONTROL:
GR"Jk[W9 MaskBits&=~CTRLBIT;
~($h9*\ break;
o/Z?/alt4 case VK_SHIFT:
)#1@@\< ^T MaskBits&=~SHIFTBIT;
P?>p+dM break;
Gv<K#@9T default: //judge the key and send message
lO:[^l?F break;
8tsW^y;S }
*r%=p/oQ}B for(int index=0;index<MAX_KEY;index++){
<jxTI%'f59 if(hCallWnd[index]==NULL)
:=-h'<D continue;
[~x
Ql if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7dAa~!/( {
hEDj"`Px SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Pj^6.f+ bProcessed=TRUE;
Zd042
% }
q")}vN }
H1+G:TM }
syMB~g else if((lParam&0xc000ffff)==1){ //有键按下
@zE_fL switch(wParam)
[gU z9iU {
U)N;=gr\ case VK_MENU:
7,Nd[
oL*7 MaskBits|=ALTBIT;
68d(6?OgW break;
e)O6k7U$ case VK_CONTROL:
nXXyX[c4e MaskBits|=CTRLBIT;
^IY1^x break;
dKhDO`.s case VK_SHIFT:
]^R;3kU4Q MaskBits|=SHIFTBIT;
j$BM$q/c break;
0Bb amU default: //judge the key and send message
t-e:f0iz break;
*SLv$A }
ob-y {x,R for(int index=0;index<MAX_KEY;index++){
CKyX Z if(hCallWnd[index]==NULL)
y~jTI[kS continue;
3}2'PC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8nW#Q<s {
Y ~xcJH SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
x%5n& B bProcessed=TRUE;
nTyKZ(#u }
t /1KKEZM }
U8;k6WT| }
*ix&"|h if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
bR(rZu5 for(int index=0;index<MAX_KEY;index++){
*q\Ve)E} if(hCallWnd[index]==NULL)
7jvf:#\LtL continue;
_}8O15B| if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
YOqGFi~` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\IQf| //lParam的意义可看MSDN中WM_KEYDOWN部分
UzWf_r }
K]1A,Q }
De6WC*trq }
M|w;7P} return CallNextHookEx( hHook, nCode, wParam, lParam );
@Xts}(L }
7o-umZ}8 <j+DY@* 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:
>,yE;zuw ]6bh #N;. BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
s3Pr$h BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
bH% k) W1dpKv 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:
9w9[0BX# dkVF LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
.B_LQ;0:
{
["TUSf] if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
j^-E,YMC {
c07'mgsU //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
% put=I SaveBmp();
:m#[V7
return FALSE;
SVB> 1s9F }
"%ou'\} …… //其它处理及默认处理
gG*]|>M JI }
va 7I_J FOV%\=Hl GrPKJ~{6 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。
wFI2(cQ &\),V 1" 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。
RdaAS{>Sk 8S/SXyS 二、编程步骤
%Z_/MNI @`t#Bi9 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";
14>WpNN pn"TFapJA 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
s2F<H# y.vYT{^ 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;
kd55y >1uo5,wrF 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;
bvn%E
H ^#i3JMq 5、 添加代码,编译运行程序。
y#tuwzE E&>3 {uZI 三、程序代码
^EtBo7^t
1'Sr0
oEd3 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
+\Uq=@ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
w8veh[%3n #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
}OZut!_ #if _MSC_VER > 1000
*ay&&S* #pragma once
n$Nb,/o #endif // _MSC_VER > 1000
Lsu_f'p0 #ifndef __AFXWIN_H__
-nK\+bTL} #error include 'stdafx.h' before including this file for PCH
[7Fx#o=da #endif
B8Vhl:p #include "resource.h" // main symbols
"2'4b class CHookApp : public CWinApp
KYw~(+gHv2 {
R;d)I^@ public:
v;6O# ta' CHookApp();
9!XXuMWU< // Overrides
ce56$L8[ // ClassWizard generated virtual function overrides
xgp 6lO [ //{{AFX_VIRTUAL(CHookApp)
wmV7g7t6 public:
IN^dJ^1+ virtual BOOL InitInstance();
b?^CnMO virtual int ExitInstance();
Xmb001 //}}AFX_VIRTUAL
)70i/%}7 //{{AFX_MSG(CHookApp)
|(eRv?Qy@ // NOTE - the ClassWizard will add and remove member functions here.
npCiqO // DO NOT EDIT what you see in these blocks of generated code !
iVaCX Xf ' //}}AFX_MSG
C(Cuk4K DECLARE_MESSAGE_MAP()
0%(.$c>:f };
OUtXu7E$ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
aw\0\'} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(J6>]MZ#) BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
e0Jz|?d= BOOL InitHotkey();
ztEM>xsk BOOL UnInit();
PKjM1wqaG@ #endif
F`Ld
WA L#|6Lnp^ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
XG!s+ShFV #include "stdafx.h"
?9Hs,J #include "hook.h"
b'O>qQ #include <windowsx.h>
$n#NUPzG+ #ifdef _DEBUG
eAl;:0=%L #define new DEBUG_NEW
x=I|O;">< #undef THIS_FILE
3;%dn\
D static char THIS_FILE[] = __FILE__;
^yFtL(x, #endif
^'G,sZ6'Nh #define MAX_KEY 100
z)_h"y?H{% #define CTRLBIT 0x04
=O
o4O CF2 #define ALTBIT 0x02
V44M=c7E #define SHIFTBIT 0x01
w D}g\{P #pragma data_seg("shareddata")
qP5'&!s&! HHOOK hHook =NULL;
nj4G8/U-q UINT nHookCount =0;
'DdR2 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"o}}[hRP static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
o6ag{Yp static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
/%{Qf static int KeyCount =0;
7#[8td static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
kSUpEV+/ #pragma data_seg()
/^\UB
fE HINSTANCE hins;
i"RBk% void VerifyWindow();
2tqj]i BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:vXlni7N[M //{{AFX_MSG_MAP(CHookApp)
jU2vnGw_ // NOTE - the ClassWizard will add and remove mapping macros here.
ad#4W0@S // DO NOT EDIT what you see in these blocks of generated code!
Wz+7CRpeP //}}AFX_MSG_MAP
.P#+V$qhv END_MESSAGE_MAP()
I-L:;~. y!u=]BE
CHookApp::CHookApp()
| k?r1dj%O {
R>;m6Rb_ // TODO: add construction code here,
TfnBPO // Place all significant initialization in InitInstance
$2/v8 }
)aAKxC7w COc
t d CHookApp theApp;
vAcxca">S LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
zEy,aa:M {
kCHYLv3. BOOL bProcessed=FALSE;
| IB4-p if(HC_ACTION==nCode)
fWs @ZCt {
M]7>Ar'zsG if((lParam&0xc0000000)==0xc0000000){// Key up
6DT^:LHS switch(wParam)
DkJ "#8Yl= {
*Y`c.n" case VK_MENU:
O48*"Z1 MaskBits&=~ALTBIT;
eufGU)M break;
4GqwY"ja case VK_CONTROL:
;!(GwgllD MaskBits&=~CTRLBIT;
Wy.^1M/n>~ break;
gGE&}EoLU case VK_SHIFT:
UUR+PfY MaskBits&=~SHIFTBIT;
u:w break;
+x]3 -s default: //judge the key and send message
Xrr3KQaK& break;
0Zh]n;S3m }
2(i|n= for(int index=0;index<MAX_KEY;index++){
czg9tG8 if(hCallWnd[index]==NULL)
l4$Iv: continue;
9Q>85IiT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
h.jO3q {
p6X-P%s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
4l'`q+^- bProcessed=TRUE;
X'J!.Jj }
'YvRkWf:KC }
@! {Y9k2 }
-?p4"[ else if((lParam&0xc000ffff)==1){ //Key down
7 g|EqJ7 switch(wParam)
3|(<]@
$ {
xi[\2g+ case VK_MENU:
#Q1}h MaskBits|=ALTBIT;
nArG
I}@ break;
=K<`nF0w case VK_CONTROL:
5m2f\^U MaskBits|=CTRLBIT;
|8?DQhd} break;
$X,dQ]M case VK_SHIFT:
&embAqW: MaskBits|=SHIFTBIT;
k`w/ break;
|B
{*so] default: //judge the key and send message
d_7hh break;
2b
K1.BD }
0.[tEnLZ for(int index=0;index<MAX_KEY;index++)
`\$EPUM {
Y_<-.?jf if(hCallWnd[index]==NULL)
d:pGdr& . continue;
&B\ sG= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
K\FLA_J {
Wv||9[Rd SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Lp)P7Yt- bProcessed=TRUE;
jG{OLF6 ! }
:DrF)1C }
)=VAEQhL- }
(H8JV1J if(!bProcessed){
=!\Y;rk for(int index=0;index<MAX_KEY;index++){
l b;P&V if(hCallWnd[index]==NULL)
ey6ujV7! continue;
@H8DGeM if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
V8#NXUg<! SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
7,zE?KG / }
C TKeY }
~F8xXW0 }
OA^6l# return CallNextHookEx( hHook, nCode, wParam, lParam );
L2=:Nac }
>p'{!k {[3xi`0- BOOL InitHotkey()
v[r8-0c {
L5'?.9] if(hHook!=NULL){
Y?3f
Fg nHookCount++;
'50}QY_R. return TRUE;
g^^pPVK_ }
yfal'DqKF else
dI|D c hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
W>5[_d if(hHook!=NULL)
Sy']fGvx nHookCount++;
Y::O*I2 return (hHook!=NULL);
kD0bdE| }
q}!h(-y}5n BOOL UnInit()
,Ha <lU2K {
CW2)1%1iz if(nHookCount>1){
d&\3}uH nHookCount--;
3I(;c ,S return TRUE;
QYi4A"$` }
w {"1V7| BOOL unhooked = UnhookWindowsHookEx(hHook);
-QwH| if(unhooked==TRUE){
>ZW|wpO nHookCount=0;
050,S`%<g8 hHook=NULL;
j8nkNE]& }
}8POm# return unhooked;
k(M:#oA! }
XT4Gz|k .T)wG;+ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
TkJ[N4'0 {
#f<v% BOOL bAdded=FALSE;
a HVzBcCPh for(int index=0;index<MAX_KEY;index++){
#y[U2s Se if(hCallWnd[index]==0){
YM};85 K hCallWnd[index]=hWnd;
PfZS"yk HotKey[index]=cKey;
b\"w/'XX HotKeyMask[index]=cMask;
vP=68muD bAdded=TRUE;
O =;jDWE KeyCount++;
J/O{x break;
+<j7^AEG }
8XG';K_ }
.r2*tB). return bAdded;
9Msy=qvYG }
z~ywFk}KGd R|v'+bv
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H]pI$t3~ {
yIrJaS- BOOL bRemoved=FALSE;
Zk`yd8C for(int index=0;index<MAX_KEY;index++){
'E+"N'M| if(hCallWnd[index]==hWnd){
bMGn&6QiP[ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#c5jCy}n hCallWnd[index]=NULL;
N+h05` HotKey[index]=0;
l?=\9y HotKeyMask[index]=0;
jj1\oyQ8 bRemoved=TRUE;
'3Lu_]I- KeyCount--;
OQ7 `n<I<) break;
m3TR}=n }
8AX_y3$ }
:nQlS }
]"lB!O~ return bRemoved;
7jgj;% }
m1U:&{:^ T!8^R|!a6 void VerifyWindow()
](A2,F
9(U {
T*f/M for(int i=0;i<MAX_KEY;i++){
>WIc"y. if(hCallWnd
!=NULL){ xbm%+
if(!IsWindow(hCallWnd)){ ]S%(l,
hCallWnd=NULL; Zym6btc
HotKey=0; qh:Bc$S
HotKeyMask=0; aL( hWE
KeyCount--; 1[^YK6a/
} #3QPcoxa
} b7Jxv7$e
} iN[x
*A|h
} oojl"j4
Y.\x.Hg
BOOL CHookApp::InitInstance() $[A\i<#
{ tqZ+2c<W3
AFX_MANAGE_STATE(AfxGetStaticModuleState()); NS~;{d\
hins=AfxGetInstanceHandle(); DK\XC%~m
InitHotkey(); \xj;{xc
return CWinApp::InitInstance(); +yp:douERi
} Z*ip=FYR
P"8Ix
int CHookApp::ExitInstance() \3$!) z
{ u3C_Xz
VerifyWindow(); RqtBz3v
UnInit(); l! F$V;R
return CWinApp::ExitInstance(); BVw2skOT
} ;^5k_\
motK}G
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ch8a
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =FrB{Eu
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Gv_~@MN
#if _MSC_VER > 1000 wQSye*ec
#pragma once #GE]]7:Na
#endif // _MSC_VER > 1000 Q$c6l[(g
;:fW]5"R
class CCaptureDlg : public CDialog rG}e\ziKuj
{ IT1YF.i
// Construction }/F$73Xd
public: AJ bCC
BOOL bTray; c3^!S0U
BOOL bRegistered; _^r};}-}
BOOL RegisterHotkey(); 9%"7~YCDas
UCHAR cKey; U`%t&7)
UCHAR cMask; LE\=Y;%
void DeleteIcon(); ^$K&Met
void AddIcon(); Yv5H41o"
UINT nCount; X0VSa{
void SaveBmp(); mdWA5p(
CCaptureDlg(CWnd* pParent = NULL); // standard constructor V4n~Z+k
// Dialog Data At'CT5=
//{{AFX_DATA(CCaptureDlg) DB5J3r81
enum { IDD = IDD_CAPTURE_DIALOG }; iT>u&0B-
CComboBox m_Key; R}ki%i5|
BOOL m_bControl; hMa; \ k
BOOL m_bAlt; Y~WdN<g
BOOL m_bShift; 0O9b
7F
CString m_Path; JWixY/
CString m_Number; ^#HaH
//}}AFX_DATA 7k(}U_v
// ClassWizard generated virtual function overrides !6KX^j-
//{{AFX_VIRTUAL(CCaptureDlg) Y%XF64)6
public: *siX:?l
virtual BOOL PreTranslateMessage(MSG* pMsg); ~U0%}Bbh
protected: Qt>K{ >9Cf
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l 88=
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2R[v*i^S
//}}AFX_VIRTUAL a!9'yc
// Implementation }a7d(7
protected: (/e&m=~
HICON m_hIcon; f#0HiE!
// Generated message map functions ]n!V
//{{AFX_MSG(CCaptureDlg) 2n:<F9^"
virtual BOOL OnInitDialog(); x]{P.7IO'
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Mg;pNK\n
afx_msg void OnPaint(); {821e&r
afx_msg HCURSOR OnQueryDragIcon(); CS7b3p!I
virtual void OnCancel(); CO
wcus
afx_msg void OnAbout(); V eGSr
afx_msg void OnBrowse(); L4>14D\
afx_msg void OnChange(); o,*m,Qc
//}}AFX_MSG r&{8/ 5"
DECLARE_MESSAGE_MAP() nTeA=0 4
}; @dWA1tM
#endif l<v{8:,e #
JQV%W+-@
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \ 'm7un
#include "stdafx.h" EYT^*1,E*
#include "Capture.h" ;6G]~}>o
#include "CaptureDlg.h" A{+/$7vek
#include <windowsx.h> UP-eKK'z
#pragma comment(lib,"hook.lib") 5 pCicwea#
#ifdef _DEBUG <=4$.2ym
#define new DEBUG_NEW uY]';OtG
#undef THIS_FILE 7=P)` @
static char THIS_FILE[] = __FILE__; M| (VM=~
#endif $*C
}iJsF
#define IDM_SHELL WM_USER+1 d@Z DIy
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h4hAzFQ.s
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U%h.l
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h/Mt<5
class CAboutDlg : public CDialog TO6F
{ Y&6jFT_
public: {7:1F)Pj
CAboutDlg(); Y25`vE(
// Dialog Data D!`[fjs6A
//{{AFX_DATA(CAboutDlg) +(+lbCW/
enum { IDD = IDD_ABOUTBOX }; xV>
.]
//}}AFX_DATA Xf4Q Lw/r
// ClassWizard generated virtual function overrides /!]K+6>u
//{{AFX_VIRTUAL(CAboutDlg) 7X$CJ%6b
protected: iC#a+G*N_M
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1)z'-dQ-5$
//}}AFX_VIRTUAL f(Xin3#'
// Implementation $H<_P'h-B
protected: !VD$uT
//{{AFX_MSG(CAboutDlg) (HAdr5
//}}AFX_MSG ygz2bHpD~
DECLARE_MESSAGE_MAP() Zux L2W
}; ;]LQ}^MP(
$bE"3/uf
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) NS[ Z@@
{ 7!M; ?Y
//{{AFX_DATA_INIT(CAboutDlg) gq('8*S
//}}AFX_DATA_INIT ?p{-Yp*h
} {]IY;cL
,$6si
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1I2ndt
{ C6e5*S
CDialog::DoDataExchange(pDX); hC$e8t60
//{{AFX_DATA_MAP(CAboutDlg) Es[3Ppz
//}}AFX_DATA_MAP lMgguu~qg
} CEj_{uf|
Te+#
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
K3zY-yIco
//{{AFX_MSG_MAP(CAboutDlg) y;az&T
// No message handlers q,[;AHb
//}}AFX_MSG_MAP }R*%q
END_MESSAGE_MAP() l"J#Pvi
JAxzXAsAR
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) g3ukx$Q{>
: CDialog(CCaptureDlg::IDD, pParent) C^$E#|E9 N
{ )v(rEY
//{{AFX_DATA_INIT(CCaptureDlg) "-:H$
m_bControl = FALSE; ,zjz "7'
m_bAlt = FALSE; Y~Uf2(7b5
m_bShift = FALSE; /
B!j`UK
m_Path = _T("c:\\"); \4 b^*`d
m_Number = _T("0 picture captured."); 9"[,9HN
nCount=0; PS~_a
bRegistered=FALSE; / :$WOQ
bTray=FALSE; x1~AY/)v
//}}AFX_DATA_INIT IR"C?
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 `C4(C4u
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >:.c?{%g*
} ^2dQVV.
x}ZXeqt{{
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pauO_'j_1p
{ zeGWM,!
CDialog::DoDataExchange(pDX); 1Ne;U/
//{{AFX_DATA_MAP(CCaptureDlg) kiF}+,z"
DDX_Control(pDX, IDC_KEY, m_Key); ",~ZO<P
DDX_Check(pDX, IDC_CONTROL, m_bControl); Lum=5zDo
DDX_Check(pDX, IDC_ALT, m_bAlt); _E9[4%f
DDX_Check(pDX, IDC_SHIFT, m_bShift); b0}dy\dnQ
DDX_Text(pDX, IDC_PATH, m_Path); >JNdtP8s/1
DDX_Text(pDX, IDC_NUMBER, m_Number); +184|nJ<2
//}}AFX_DATA_MAP n%WjU)<
} I?1BGaAA
blomB2vQ
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mBL?2~M
//{{AFX_MSG_MAP(CCaptureDlg) g8/ ,E-u
ON_WM_SYSCOMMAND() }>iNT.Lvd
ON_WM_PAINT() e=##X}4zZ
ON_WM_QUERYDRAGICON() $$ $[Vn_H<
ON_BN_CLICKED(ID_ABOUT, OnAbout) yFm88
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )W_akUL
ON_BN_CLICKED(ID_CHANGE, OnChange) ;QVTb3Th
//}}AFX_MSG_MAP |QZ
E
END_MESSAGE_MAP() *QN,wBQ
x'-gvbj!
BOOL CCaptureDlg::OnInitDialog() ;~1xhpTk
{ w.rcYywI
CDialog::OnInitDialog(); B|o@|zF
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J<0sT=/2$
ASSERT(IDM_ABOUTBOX < 0xF000); {*;K>%r\o
CMenu* pSysMenu = GetSystemMenu(FALSE); P*[wB_^&UP
if (pSysMenu != NULL) E;H9]*x/
{ pa^_D~
CString strAboutMenu; H{*rV>%
strAboutMenu.LoadString(IDS_ABOUTBOX); SDbkPx
if (!strAboutMenu.IsEmpty()) me@`;Q3
{ SP<(24zdd
pSysMenu->AppendMenu(MF_SEPARATOR); IPTFx
)]G
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); C`ZU.|R
} K:13t|
} ,5U[#6^
SetIcon(m_hIcon, TRUE); // Set big icon "kFNOyj3\
SetIcon(m_hIcon, FALSE); // Set small icon qQfNT.
m_Key.SetCurSel(0); pSAtn
RegisterHotkey(); rPr]f;
CMenu* pMenu=GetSystemMenu(FALSE); p/eaO{6 6
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ZG +FX:v
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P@bPdw!JA
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3{qB<*!p"G
return TRUE; // return TRUE unless you set the focus to a control hKg +A
} IPn!iv)
W2%@}IDm
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +mft
{ q`8
5-
if ((nID & 0xFFF0) == IDM_ABOUTBOX) d %FLk=]
{ W9}
,f
CAboutDlg dlgAbout; r=37Q14v
dlgAbout.DoModal(); s-I M
} tYgHJ~1L*
else DBGU:V,85
{ o;
6^:
CDialog::OnSysCommand(nID, lParam); 4C?4M;
} )Ft+eMYti[
} b{&'r~
n5oX 51J
void CCaptureDlg::OnPaint() -cJ,rrN_9
{
|Ch,C
if (IsIconic()) "J*>g(H53
{ Af@\g-<W_
CPaintDC dc(this); // device context for painting @+nCNXK
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]H{*Z3S
// Center icon in client rectangle <H#0pFB
int cxIcon = GetSystemMetrics(SM_CXICON); uF[*@N
int cyIcon = GetSystemMetrics(SM_CYICON); Xe:rPxZf~
CRect rect; V$FZVG/@#
GetClientRect(&rect); d"E3ypPK
int x = (rect.Width() - cxIcon + 1) / 2; _B^X3EOc
int y = (rect.Height() - cyIcon + 1) / 2; Xk'Pc0@a
// Draw the icon '
-9=>
dc.DrawIcon(x, y, m_hIcon); O> _ F
} qnQ".
else Cb|1Jtb
{ 2 ( I4h[
CDialog::OnPaint(); -da: j-_
} K}
T=j+
} KSS]% 66Y
R-<8j`[0
HCURSOR CCaptureDlg::OnQueryDragIcon() Wt@hST
{ v:Gy>&
return (HCURSOR) m_hIcon; K;Hgq4
} 1R yE8DdP
gH,Pz
void CCaptureDlg::OnCancel() =z"8#_3A
{ f.%3G+
if(bTray) +Q"~2_q5/;
DeleteIcon(); =_j<x$,b-
CDialog::OnCancel(); Al@. KTK
} 3*\Q]|SI!
oa=TlBk<
void CCaptureDlg::OnAbout() *_J{_7pwe
{ _<F;&(o
CAboutDlg dlg; N^wHO<IO1
dlg.DoModal(); H2Z
e\c
} QBi]gT@&g
Q}l~n)=
void CCaptureDlg::OnBrowse() bYpeI(zK
{ ^~vM*.j~j
CString str; 2 A";oE
BROWSEINFO bi; ?WqaT) l~
char name[MAX_PATH]; TF!v ,cX
ZeroMemory(&bi,sizeof(BROWSEINFO)); p_]b=3wt~
bi.hwndOwner=GetSafeHwnd(); -F*vN'
bi.pszDisplayName=name; ~:0w%
bi.lpszTitle="Select folder"; oP4+:r)LKD
bi.ulFlags=BIF_RETURNONLYFSDIRS; <s\ZqL$f
LPITEMIDLIST idl=SHBrowseForFolder(&bi); h 6IXD N
if(idl==NULL) fE)o-q6Z
return; ^A=tk!C
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^Z\"d#A
str.ReleaseBuffer(); .p o,.}
m_Path=str; &Ruq8n<
if(str.GetAt(str.GetLength()-1)!='\\') Ndb7>"W
m_Path+="\\"; qP&:9eL
UpdateData(FALSE); B/;'D7i|S
} %I!2dXNFRF
[dz3k@ >0
void CCaptureDlg::SaveBmp() Rrl
{ ZQ*Us*9I
CDC dc; ;PMh>ZE`
dc.CreateDC("DISPLAY",NULL,NULL,NULL); kw#-\RR_c
CBitmap bm; %QGw`E
int Width=GetSystemMetrics(SM_CXSCREEN); Fsx<Sa
int Height=GetSystemMetrics(SM_CYSCREEN); Z^'\()3t
bm.CreateCompatibleBitmap(&dc,Width,Height); F&7|`o3
CDC tdc; -r3
s{HO
tdc.CreateCompatibleDC(&dc); KUm?gFh
CBitmap*pOld=tdc.SelectObject(&bm); P7Qel ,
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n{etDO
tdc.SelectObject(pOld); v4'kV:;&
BITMAP btm; dkDPze9l
bm.GetBitmap(&btm); wsH _pF
DWORD size=btm.bmWidthBytes*btm.bmHeight;
q~W:W}z
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bX:h"6{=R
BITMAPINFOHEADER bih; q3h&V
bih.biBitCount=btm.bmBitsPixel; dT?3Q;>B?
bih.biClrImportant=0; f^"pZS
bih.biClrUsed=0; nu~]9~)I
bih.biCompression=0; $)8,dS
bih.biHeight=btm.bmHeight; aH@-"Wi
bih.biPlanes=1; 5U+4vV/*
bih.biSize=sizeof(BITMAPINFOHEADER); O1t$]k:
bih.biSizeImage=size; kcg\f@d$
bih.biWidth=btm.bmWidth; `=,emP&(H&
bih.biXPelsPerMeter=0; d}ycC.h4k
bih.biYPelsPerMeter=0; ~Fwbi
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Sl ^PELU
static int filecount=0; ZE_
CString name; hLk6Hqr7
name.Format("pict%04d.bmp",filecount++); %OO}0OW
name=m_Path+name; mb1c9
BITMAPFILEHEADER bfh; =8<~pr-NO
bfh.bfReserved1=bfh.bfReserved2=0; 0jjtx'F
bfh.bfType=((WORD)('M'<< 8)|'B'); %+Z*-iX
bfh.bfSize=54+size; iI7ocyUv
bfh.bfOffBits=54; h4F%lGot
CFile bf; 3/Z>W|w#w
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ NT5'U
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); j4#uj[A
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); PR$;*|@
bf.WriteHuge(lpData,size); ^i!6z2/
bf.Close(); v0E6i!D/
nCount++; |K-`
} -]D/8,|s
GlobalFreePtr(lpData); VHl1f7%@H
if(nCount==1) A%$~
m_Number.Format("%d picture captured.",nCount); $8HiX6r
else R(VOHFvW6
m_Number.Format("%d pictures captured.",nCount); 2ag8?#
UpdateData(FALSE); Q%d1n*;+
} 8 p[n>qV9
Q3&q%n|<
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /"u37f?[^
{ Rq[d\BN0.d
if(pMsg -> message == WM_KEYDOWN) Ur>1eN%9'
{ 09G47YkSy1
if(pMsg -> wParam == VK_ESCAPE) u{\'/c7G
return TRUE; S5y.H
if(pMsg -> wParam == VK_RETURN) zhFm2
return TRUE; fbOqxF"?we
} )=29Hm"
return CDialog::PreTranslateMessage(pMsg); rZaO^}u]
} Z
f\~Cl
bP#!U'b" =
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @v#P u_
{ \y=oZk4
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [x>Ju&))$
SaveBmp(); zB`woI28
return FALSE; 23>[-XZb[O
} NE8W--Cg|
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @&WHX#
CMenu pop; ja';NIO-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));
G7al@
CMenu*pMenu=pop.GetSubMenu(0); T:Klr=&V
pMenu->SetDefaultItem(ID_EXITICON); [{BY$"b#:
CPoint pt; 5Q"w{ n
GetCursorPos(&pt); Cg]),S
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); C=r2fc~w
if(id==ID_EXITICON) ZqVbNIY
DeleteIcon(); Xzf,S;XV~
else if(id==ID_EXIT) p T 8?z
OnCancel(); `;;l {8
return FALSE; y3s+.5;
} wAprksZL#
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \?^2}K/
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }a6t <m`V
AddIcon(); F1L[3D^-
return res; ~RuX2u-2&u
} NEri{qxm
^1bslCe
void CCaptureDlg::AddIcon() f;zNNx<
;
{ m3lz#Pm'0
NOTIFYICONDATA data; .=#jdc/
data.cbSize=sizeof(NOTIFYICONDATA); CG=c@-"n/
CString tip; K\F0nToJ.
tip.LoadString(IDS_ICONTIP); L4g%o9G
data.hIcon=GetIcon(0); [c
8=b,EI
data.hWnd=GetSafeHwnd(); H,X|-B
strcpy(data.szTip,tip); 0Lxz?R x]<
data.uCallbackMessage=IDM_SHELL; 8v& \F
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Kg$RT?q-C6
data.uID=98; $El-pMq
Shell_NotifyIcon(NIM_ADD,&data); 5h#h>0F
ShowWindow(SW_HIDE); .w.:o2L
bTray=TRUE; =79R;|5
} 2(xC|
E
s5:S#
void CCaptureDlg::DeleteIcon() 'Be'!9K*d
{ `)n4I:)2
NOTIFYICONDATA data; Pj-INc96
data.cbSize=sizeof(NOTIFYICONDATA); yS\&2"o
data.hWnd=GetSafeHwnd(); \% =\4%:
data.uID=98; k k3^m1
Shell_NotifyIcon(NIM_DELETE,&data); <'I["Um
ShowWindow(SW_SHOW); :;7I_tb
SetForegroundWindow(); fo@^=-4A-
ShowWindow(SW_SHOWNORMAL); pD732L@q
bTray=FALSE; 9RaO[j`
} (G>[A}-
;[sW\Ou
void CCaptureDlg::OnChange() S }`sp[6
{ d qn5G!fI
RegisterHotkey(); p?:5U[KM
} 5:h[%3'bB
e{P v:jl
BOOL CCaptureDlg::RegisterHotkey() -Ks>s
{ 7w/IHM L
UpdateData(); #dA$k+3
UCHAR mask=0; \WCQ>c?~
UCHAR key=0; v~P,OP("c
if(m_bControl) o|(5Sr&H
mask|=4; NXY jb(4:
if(m_bAlt) I#M3cI!X?
mask|=2; ;!4gDvm
if(m_bShift) F1t( P 8
mask|=1; z*eBjHbF
key=Key_Table[m_Key.GetCurSel()]; smQ^(S^
if(bRegistered){ 2@D`^]]
DeleteHotkey(GetSafeHwnd(),cKey,cMask); do}LaUz
bRegistered=FALSE; jmM|on!
} 6Dq4Q|C
cMask=mask; #.bW9j/
cKey=key; $"^K~5Q
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rVYoxXv
return bRegistered; >1~
/:DJ
} _/s"VYFZ
i6`"e[aT[o
四、小结 @p+;iS1}
%iN>4;T8
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。