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:
<jRs/?1R
,JmA e6 一、实现方法
G.c@4Wz+ ?4}EhXR( 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:
UT7".1H =m=utd8 #pragma data_seg("shareddata")
Gg9NG`e6I HHOOK hHook =NULL; //钩子句柄
u(|k/~\ UINT nHookCount =0; //挂接的程序数目
=.Q|gZ
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
zwKm;;v8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
jZ>'q/ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
2_HPsEx static int KeyCount =0;
ZW|VAn'> static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
/A) v$Bv= #pragma data_seg()
a4M`Bk;mb R!.HS0i. 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。
c~UYs\ }qOC*k: 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:
$0K%H o$r]Z1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
1f1J'du cKey,UCHAR cMask)
<U$A_]*w {
#Rdq^TGMi; BOOL bAdded=FALSE;
weiqt
*,8 for(int index=0;index<MAX_KEY;index++){
/< CjBW: if(hCallWnd[index]==0){
'3@WF2a hCallWnd[index]=hWnd;
6'6@VB HotKey[index]=cKey;
/Iu._2 HotKeyMask[index]=cMask;
'2%/h4jY bAdded=TRUE;
=}~hbPJM KeyCount++;
kM?p >V6 break;
y]`@%V2P }
&xqr&(o }
B$ )6X return bAdded;
-zVa[& }
[\&Mo]"0 //删除热键
0|:Ic, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
_r|$H_# {
M_4g%uHG BOOL bRemoved=FALSE;
uOrvmb for(int index=0;index<MAX_KEY;index++){
W+~ w if(hCallWnd[index]==hWnd){
.SdEhW15) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
1W5\ hCallWnd[index]=NULL;
+mT}};-TS HotKey[index]=0;
xW,(d5RtZ HotKeyMask[index]=0;
A2"xCJ0` bRemoved=TRUE;
>cD+&h34 KeyCount--;
c])b?dJ* break;
5Ffz^;i }
u-h3xj }
9Yowz]') }
`8TM<az-L return bRemoved;
$E4W{ad2jW }
%6"b<
MAO 1a90S*M R6Cm:4m}I DLL中的钩子函数如下:
Tf"DpA!_ >M^
1m( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[lA[wCw {
DwZt.* BOOL bProcessed=FALSE;
ys;e2xekg if(HC_ACTION==nCode)
@"HR"@pX {
@:xO5L}Io if((lParam&0xc0000000)==0xc0000000){// 有键松开
D.<CkDB switch(wParam)
&hba{!`y {
>{4pEy case VK_MENU:
5e,Dk0d MaskBits&=~ALTBIT;
W&4`eB/4} break;
H9w*U case VK_CONTROL:
g}3c r. MaskBits&=~CTRLBIT;
*ma/_rjK break;
xIrpGLPSh case VK_SHIFT:
K.R2)o` MaskBits&=~SHIFTBIT;
}FMl4 _}u break;
IO xj$ ?%l default: //judge the key and send message
-&kQlr break;
KF'H|)!K }
*4qsM,t for(int index=0;index<MAX_KEY;index++){
-H`G6oMOO if(hCallWnd[index]==NULL)
R\:C|/6f continue;
_:'m/K3Ee if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
NI(`o8fN {
"`"j2{9|e! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^;s`[f|w bProcessed=TRUE;
{7eKv+30 }
H]=3^ g64 }
`CK;,>i }
X{#@ :z$ else if((lParam&0xc000ffff)==1){ //有键按下
vtmO switch(wParam)
#K!Df%,< {
\MtiLaI" case VK_MENU:
:/vB,JC MaskBits|=ALTBIT;
$hSu~}g break;
OV8b~k4= case VK_CONTROL:
h;4g#|, MaskBits|=CTRLBIT;
|7`Vw Z break;
Uzb"$Ue4 case VK_SHIFT:
Z{p6Q1u MaskBits|=SHIFTBIT;
Sc6wC H break;
X=\#n-* default: //judge the key and send message
C3@.75-E break;
F` I-G~e }
r$v?[x>+K for(int index=0;index<MAX_KEY;index++){
$xu?zd" if(hCallWnd[index]==NULL)
;wQWt_OtuJ continue;
% C
3jxt if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:GK{JP {
j5'Jp} SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6>=>Yj bProcessed=TRUE;
)1fQhdO}x }
@L<[38 }
DQlaSk4hF_ }
b7AuKY{L if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
HnP;1Gi for(int index=0;index<MAX_KEY;index++){
oLr"8R\d>t if(hCallWnd[index]==NULL)
!W%HAlUAG[ continue;
X^|oY]D if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
zK-hNDFL{ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(uG4W|?p //lParam的意义可看MSDN中WM_KEYDOWN部分
D8?$Fn= }
BRD'5 1]| }
}uHc7gTBF7 }
a ^)Mx9 return CallNextHookEx( hHook, nCode, wParam, lParam );
b(Z%#*e }
n/,7ryu G'Q7(c 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:
)%y~{j+ M .v" lY2:N BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
rd,mbH[<C BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
uPF yRWK u4<r$[]V 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
]R4)FH|>< HJJ^pk& LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
xu:m~8% {
g
Go if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
rp'fli?0e {
tt^ze|*&t //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
f]'@Vt> SaveBmp();
34oLl#q* return FALSE;
D@^F6am% }
bg
HaheU …… //其它处理及默认处理
KFZ[gqW8YY }
T?\CAk> Rm*}<JN31 y2 +a2 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
=O;SXzgE jVA~]a 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
?UfZ VyHv+ <{) 4gvH 二、编程步骤
4]B3C\
v ^mum5j 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
]Qu12Wg}P tl)}Be+Dt; 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Pj.~|5gnf ,#E5 /'c` 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
%UQ{'JW?K ,oG"wgf 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
zJnVO$A' r6$=|Yto 5、 添加代码,编译运行程序。
KvD$`"L/CT {cv;S2 三、程序代码
_#gsR"FZ$ bY2Mw8e% ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
lXPn]iLJ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
4 P;O8KA5y #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
b{I`$E<[ #if _MSC_VER > 1000
?:FotnU*p #pragma once
Hxl,U>za# #endif // _MSC_VER > 1000
@}?D<O8#"# #ifndef __AFXWIN_H__
Lq [wabF #error include 'stdafx.h' before including this file for PCH
%8*d)AB: #endif
`e9uSF:9C #include "resource.h" // main symbols
;:|KfXiC8 class CHookApp : public CWinApp
|f:d72{Qr {
q8h{-^" public:
w3w*"M CHookApp();
gr?pvf!I // Overrides
"B}08C,? // ClassWizard generated virtual function overrides
O0{ //{{AFX_VIRTUAL(CHookApp)
U]D.z}0 public:
/K!,^Xn virtual BOOL InitInstance();
}}1/Ede{5 virtual int ExitInstance();
vQ/\BN //}}AFX_VIRTUAL
*_QHtZG //{{AFX_MSG(CHookApp)
|d5L
Ifb( // NOTE - the ClassWizard will add and remove member functions here.
-{*V)J_Co // DO NOT EDIT what you see in these blocks of generated code !
DXz8C - //}}AFX_MSG
/a(zLHyz) DECLARE_MESSAGE_MAP()
e\_6/j7' };
BP[U`
! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
.V3Dql@z" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
l1)pr{A BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
n`}&,UA$4 BOOL InitHotkey();
N 9&@,3 BOOL UnInit();
Mak9qaWqF> #endif
BZ<z@DJp k@aP&Z~ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
%~5Q^3$O #include "stdafx.h"
GF!{SO4 #include "hook.h"
GnOo+hB #include <windowsx.h>
W`'|&7~ #ifdef _DEBUG
V
3]p3 #define new DEBUG_NEW
#Q@6:bBzv #undef THIS_FILE
XC1lo4| static char THIS_FILE[] = __FILE__;
erP>P #endif
y:OywIi( #define MAX_KEY 100
W{+0iAYnp #define CTRLBIT 0x04
Ql@yN@V #define ALTBIT 0x02
$M`;." #define SHIFTBIT 0x01
sYA-FO3gh #pragma data_seg("shareddata")
is?&%VY HHOOK hHook =NULL;
_<a)\UR UINT nHookCount =0;
j$|C/E5? static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
r65NKiQD static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
3Gl]g/ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
otSPi7|k static int KeyCount =0;
rgzI static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
dO4#BDn"= #pragma data_seg()
]0i2]=J&, HINSTANCE hins;
pmyM&'#Id void VerifyWindow();
Au._n,< BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
+@uC:3jM //{{AFX_MSG_MAP(CHookApp)
^Ai_/! " // NOTE - the ClassWizard will add and remove mapping macros here.
&&nO]p` // DO NOT EDIT what you see in these blocks of generated code!
p\_qHq\;j //}}AFX_MSG_MAP
GLQvAHC END_MESSAGE_MAP()
]GtR8w@w 6J-}&U CHookApp::CHookApp()
eH!|MHe {
$ XsQ e // TODO: add construction code here,
c;rp@_ULG? // Place all significant initialization in InitInstance
U\8#Qvghf }
q7 oR9 [E~,> Q CHookApp theApp;
EjX'&"3. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!en F8a {
cNr][AzU@ BOOL bProcessed=FALSE;
<Ihed| if(HC_ACTION==nCode)
mjl!Nth:< {
n{Qh8" if((lParam&0xc0000000)==0xc0000000){// Key up
3d'ikkXK switch(wParam)
y [9}[NMZ {
A%*DQ1N case VK_MENU:
R,w54}, MaskBits&=~ALTBIT;
}Q=se[(( break;
Zc3:9 case VK_CONTROL:
5652'p MaskBits&=~CTRLBIT;
Z^`=!n-V break;
g}
~<!VpX case VK_SHIFT:
T{H#]BF<E MaskBits&=~SHIFTBIT;
:iQ^1S`pH break;
fI
d) default: //judge the key and send message
,c7u break;
khN:+V| }
KvJP(!{ for(int index=0;index<MAX_KEY;index++){
)]b@eGNGj if(hCallWnd[index]==NULL)
K# i*9sM continue;
mz VuQ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0HJqsSZ$mW {
Go+xL/f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
F}B/-".^ bProcessed=TRUE;
Ddl% V7 }
9Oo*8wvGG }
;Jbc'V'fm }
k *;{n8o?) else if((lParam&0xc000ffff)==1){ //Key down
Sp~Gv>uMK switch(wParam)
FX|lhwmc( {
KpbZnW}g case VK_MENU:
=7]Q6h@X MaskBits|=ALTBIT;
aBVEk2 p break;
VVQ74b case VK_CONTROL:
Y\g90 MaskBits|=CTRLBIT;
1[/$ZYk: break;
d[RWkk5 case VK_SHIFT:
n|mJE,N MaskBits|=SHIFTBIT;
:YJ7J4 break;
[%iUg\'7d default: //judge the key and send message
&X]=Qpl break;
,4>WLJDo }
/Xu;/MMpd3 for(int index=0;index<MAX_KEY;index++)
x:n9dm {
TCKI if(hCallWnd[index]==NULL)
&v
auLp continue;
>.O*gv/_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ok>P [
&! {
22Y!u00D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
lGnql 1( bProcessed=TRUE;
YKw!pu= }
ZLN_,/7 }
1^60I#Vr@ }
ny if(!bProcessed){
3dX=xuQ%/ for(int index=0;index<MAX_KEY;index++){
@1/}-.(n if(hCallWnd[index]==NULL)
cdJ`Gk continue;
c6Yf"~TD0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
csFJ5 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
1IF'>* }
RlslF9f }
j""y2c1 }
Y( V3PnH return CallNextHookEx( hHook, nCode, wParam, lParam );
LG Y!j_bD }
Qw6KX#n p-i.ITRS BOOL InitHotkey()
|auX*hb9 {
I_zk' if(hHook!=NULL){
{+/
.5 nHookCount++;
g]==!!^<D return TRUE;
$||ns@F+ }
:?$Sb8OuIL else
){:q;E]^fB hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
/H%<oAjp6 if(hHook!=NULL)
3I;xU(rv nHookCount++;
a* W_fxb return (hHook!=NULL);
^z *):e }
5!SoN}$ BOOL UnInit()
/Oq)3fU
e {
2Z/][?Jj{ if(nHookCount>1){
\f /! nHookCount--;
rF8W(E_= return TRUE;
}1a <{& }
?`N57'iPb BOOL unhooked = UnhookWindowsHookEx(hHook);
<=)D=Ax/_[ if(unhooked==TRUE){
3XAp Y' nHookCount=0;
\tiUEE|k hHook=NULL;
`'[7~ Ew[ }
WbC0H78] return unhooked;
oeu|/\+HW }
daA47`+d )]c]el@y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
LXh@o1 {
KJ0xp hf BOOL bAdded=FALSE;
L@1,7@
for(int index=0;index<MAX_KEY;index++){
J$6-c'8 if(hCallWnd[index]==0){
JVUZ}#O hCallWnd[index]=hWnd;
>bX-!<S HotKey[index]=cKey;
b(.-~c(' HotKeyMask[index]=cMask;
Xr@l+zr bAdded=TRUE;
6m, KL5>W KeyCount++;
IdV,%d{ break;
,YP1$gj }
"<PoJPh }
[):{5hMA return bAdded;
97qtJ(ESI }
5"-una>D }
*
?n?' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
h*;g0QBkl {
ill-%OPeg BOOL bRemoved=FALSE;
{h/OnBwG for(int index=0;index<MAX_KEY;index++){
=_$XP if(hCallWnd[index]==hWnd){
dN$ 1$B^k if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
a"0B?3*r46 hCallWnd[index]=NULL;
4
[R8(U[g HotKey[index]=0;
RLYU\@kK? HotKeyMask[index]=0;
a)3O? Y bRemoved=TRUE;
Vl5SL{+D KeyCount--;
_o@(wGeu# break;
G$?|S@I, }
2Ueq6IuQ }
!Y ;H(.A/ }
N5pinR5 H return bRemoved;
Xt</ -` }
Od0S2hHO y-w2O] void VerifyWindow()
Ujce |>Wn {
`3f_d}b for(int i=0;i<MAX_KEY;i++){
,{.zh&=4 if(hCallWnd
!=NULL){ U0NOU#
if(!IsWindow(hCallWnd)){ w)45SZ.
hCallWnd=NULL; B#HV20\?v
HotKey=0; +V)qep"
HotKeyMask=0; }1U#Ve,=_
KeyCount--; t$U3|r
} qn2o[x
} E:u ReT
} L*zbike
} ,sO:$
(H&@u9K?a?
BOOL CHookApp::InitInstance() qSFc=Wwc
{ vVI6m{zYV
AFX_MANAGE_STATE(AfxGetStaticModuleState()); j2RRSz&9
hins=AfxGetInstanceHandle(); 38[)[{G)Hv
InitHotkey(); cvZni#o2)
return CWinApp::InitInstance(); ?j1_
n,d
} a$w},=
`E
VK @$JwdL
int CHookApp::ExitInstance() z=ML(1c=
{ OJ v}kwV
VerifyWindow(); |BwRlE2CFO
UnInit(); El~-M`Gf
return CWinApp::ExitInstance(); UH5w7M
} EoKC8/
,/i_QgP
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k/df(cs
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :=rA Yc3]
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FJO"|||Y'|
#if _MSC_VER > 1000 r8IX/ ,
#pragma once oS~}TR:}
#endif // _MSC_VER > 1000 w+q?T
%oAL
class CCaptureDlg : public CDialog _Ny8j~
{ =kd YN5R
// Construction ,5/V@;i
public: q.-y)C) ;
BOOL bTray; _e6a8
BOOL bRegistered; >R( 8/#|E
BOOL RegisterHotkey(); `'uUmyg
UCHAR cKey; }ppVR$7]0
UCHAR cMask; CV s8s
void DeleteIcon(); *i`v~>
void AddIcon(); UE^D2 u
UINT nCount; -g:lOht
void SaveBmp(); DKh}Y
!Q=:
CCaptureDlg(CWnd* pParent = NULL); // standard constructor L'>s(CR
// Dialog Data 1<`9HCm
//{{AFX_DATA(CCaptureDlg) w|=gSC-o
enum { IDD = IDD_CAPTURE_DIALOG }; N6h1|_o
CComboBox m_Key; 6MuWlCKF8
BOOL m_bControl; (YIhTSL"]
BOOL m_bAlt; Z)/6??/R
BOOL m_bShift; HzE1r+3Q@
CString m_Path; WNhbXyp_
CString m_Number; H6_xwuw:
//}}AFX_DATA w TlGJ$D0
// ClassWizard generated virtual function overrides sYI~dU2H
//{{AFX_VIRTUAL(CCaptureDlg) QjLji+L
public: p"KU7-BfvC
virtual BOOL PreTranslateMessage(MSG* pMsg); nB=0T`vQ
protected: O7v]p
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M:_!w[NiLp
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); So#dJ>
//}}AFX_VIRTUAL iSlFRv?a
// Implementation o
w2$o\hC
protected: ;
yyO0Ha
HICON m_hIcon; wy''tqg6
// Generated message map functions hm3jpWi8
//{{AFX_MSG(CCaptureDlg) r=qLaPG
virtual BOOL OnInitDialog(); 7$
d}!S
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); cS}r9gaQ
afx_msg void OnPaint(); P<u"97@8a
afx_msg HCURSOR OnQueryDragIcon(); 6^sHgYR
virtual void OnCancel(); e&2wdH&
afx_msg void OnAbout(); J/t!-!
afx_msg void OnBrowse(); }w@gj"\H
afx_msg void OnChange(); &s:=qQa1
//}}AFX_MSG @;m$ua*|:
DECLARE_MESSAGE_MAP() ;`kWpM;
}; W}h|K:-S
#endif X/Y#U\
GQx9u^>
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file a\pi(9R
#include "stdafx.h" %fv)7 CRM
#include "Capture.h" {]^2R>0Q
#include "CaptureDlg.h" `@|w>8bMz{
#include <windowsx.h> #XI"@pD
#pragma comment(lib,"hook.lib") hq?jdNy
:
#ifdef _DEBUG rs:Q%V
^
#define new DEBUG_NEW a=+T95ulDy
#undef THIS_FILE khAqYu")
static char THIS_FILE[] = __FILE__; NhA#bn9y?
#endif 1kmQX+f
#define IDM_SHELL WM_USER+1 O%-h&C3
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7 jjU
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VFO\4:.
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
: tM?%=Q
class CAboutDlg : public CDialog b{RqwV5P
{ fYBH)E
public: YUscz!rM
CAboutDlg(); 2zK"*7b?
// Dialog Data &x0C4Kh
//{{AFX_DATA(CAboutDlg) yG&2UqX
enum { IDD = IDD_ABOUTBOX }; S$eDnw~$
//}}AFX_DATA u g\w\b
// ClassWizard generated virtual function overrides Kd3QqVJBz1
//{{AFX_VIRTUAL(CAboutDlg) :Q_x/+-
protected: {B0h+. C
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JRO$<
//}}AFX_VIRTUAL pUCK-rL
// Implementation 1zjaR4Tf
protected: Ax!Gu$K2o
//{{AFX_MSG(CAboutDlg) kZVm1W1
//}}AFX_MSG z/1{OL
DECLARE_MESSAGE_MAP() EA|k5W*b
}; (R'+jWH
Fk1.iRVzi
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |;u}sX1t9
{ s-k_d<
//{{AFX_DATA_INIT(CAboutDlg) z<pJYpxH
//}}AFX_DATA_INIT \cQ .|S
} R#(G%66
4DLq}v
void CAboutDlg::DoDataExchange(CDataExchange* pDX) n|i"S`
{ :EZQ'3X
CDialog::DoDataExchange(pDX); ++8_fgM
//{{AFX_DATA_MAP(CAboutDlg) lJ{V
//}}AFX_DATA_MAP +;q.Y?
} >qR~'$,$
9s` /~ a@
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Bux'hc
//{{AFX_MSG_MAP(CAboutDlg) ? _<[T
// No message handlers W#XG;
//}}AFX_MSG_MAP \M(*=5
END_MESSAGE_MAP() M)!skU
!QEL"iJ6M'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U,;xZe
: CDialog(CCaptureDlg::IDD, pParent) H"CUZ
{ 6;oe=Q:Q
//{{AFX_DATA_INIT(CCaptureDlg) ;GsQR+en
m_bControl = FALSE; /N)5
3!LT
m_bAlt = FALSE; 8LJ{i%
m_bShift = FALSE; !@g)10u
m_Path = _T("c:\\"); 1f4bt6[
m_Number = _T("0 picture captured."); ;/LD)$_
nCount=0; u+D[_yd^
bRegistered=FALSE; x*}bo))hb
bTray=FALSE; }!)F9r@\
//}}AFX_DATA_INIT =Q(vni83<
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DjHp+TyT
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 8)xt(~qF
} ~rv})4h
$/_qE
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) SwH2$:f
{ $h28(K%
CDialog::DoDataExchange(pDX); 8o-bd_
//{{AFX_DATA_MAP(CCaptureDlg) ?Zz'|.l@
DDX_Control(pDX, IDC_KEY, m_Key); NY.k.
DDX_Check(pDX, IDC_CONTROL, m_bControl); z.)p
P'CJo
DDX_Check(pDX, IDC_ALT, m_bAlt); f h<*8w0H
DDX_Check(pDX, IDC_SHIFT, m_bShift); o a<q /
DDX_Text(pDX, IDC_PATH, m_Path); "T6#
DDX_Text(pDX, IDC_NUMBER, m_Number); D59T?B|BdD
//}}AFX_DATA_MAP PRs@zkO
} 2 x4=
lKV"Mh+6
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wW`}VKu
//{{AFX_MSG_MAP(CCaptureDlg) A6UO0lyu
ON_WM_SYSCOMMAND() uDayBaR
ON_WM_PAINT() ^O6*e]C$
ON_WM_QUERYDRAGICON() [-w@.^:]X
ON_BN_CLICKED(ID_ABOUT, OnAbout) RT*5d;l0
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) nr2r8u9r
ON_BN_CLICKED(ID_CHANGE, OnChange) Llz['"m
//}}AFX_MSG_MAP HDIk9WC^
END_MESSAGE_MAP() Z=+03
NZXjE$<Vr
BOOL CCaptureDlg::OnInitDialog() Lz4ehWntO
{ Bw<rp-
CDialog::OnInitDialog(); ZR3nK0
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 7}B
ASSERT(IDM_ABOUTBOX < 0xF000); .36^[Jsz":
CMenu* pSysMenu = GetSystemMenu(FALSE); &ak6zM
if (pSysMenu != NULL) gPEqjj
{ c-CYdi@
CString strAboutMenu; KN[d!}W:
strAboutMenu.LoadString(IDS_ABOUTBOX); 6C-YyI#s#
if (!strAboutMenu.IsEmpty()) 8_we:
9A
{ (P@Y36j>N
pSysMenu->AppendMenu(MF_SEPARATOR); IcF@F>>
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 85 ]SC$
} :tGYs8UK
} 61K"(r~
SetIcon(m_hIcon, TRUE); // Set big icon <{ru|-9
SetIcon(m_hIcon, FALSE); // Set small icon
K5"sj|d&
m_Key.SetCurSel(0); 3|kgTB-
RegisterHotkey(); 'Bq ZOZw
CMenu* pMenu=GetSystemMenu(FALSE); (f1M'w/OD
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); q<{NO/Mm
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); O`W%Tr
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H[Weu
return TRUE; // return TRUE unless you set the focus to a control 6yIvaY$KR
} n2ndjE$
0SV \{]2
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [Ot,q/hBJ
{ 3]LN;s]ac
if ((nID & 0xFFF0) == IDM_ABOUTBOX) JW+*d`8Z[
{ (> "QVxr
CAboutDlg dlgAbout; ^toAw8A=@0
dlgAbout.DoModal(); :FQ1[X1xm
} pY}/j;.[
else U;^[$Aq
{ V1bh|+o9
CDialog::OnSysCommand(nID, lParam); |V&G81sM
} 1dG06<!
} B~gV'(9g
yTAvF\s$(
void CCaptureDlg::OnPaint() VOgi7\
{ OtUrGQP
if (IsIconic()) (Mt5 P
{ w:ULi3
CPaintDC dc(this); // device context for painting 1B:aC|B
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O!R"v'
// Center icon in client rectangle w2"]Pl
int cxIcon = GetSystemMetrics(SM_CXICON); -- k:a$Nt
int cyIcon = GetSystemMetrics(SM_CYICON); `T WN^0!]
CRect rect; <'m6^]:
GetClientRect(&rect); clDHTj=~
int x = (rect.Width() - cxIcon + 1) / 2; @LX6hm*}
int y = (rect.Height() - cyIcon + 1) / 2; M] EsS^/X
// Draw the icon lrEj/"M
dc.DrawIcon(x, y, m_hIcon); \8b6\qF/\
} x8N|($1
else f~M8A.
{
'3,\@4
CDialog::OnPaint(); Ex(3D[WmMW
} \M+L3*W
} xHkxc}h
Ka-p& Uv1<
HCURSOR CCaptureDlg::OnQueryDragIcon() |:q/Dt@
{ Je7RrCz
return (HCURSOR) m_hIcon; dbF M,"^
} `rFAZcEj%
mP}#Ccji?
void CCaptureDlg::OnCancel() wD9a#AgEd
{ KS<Jv;
if(bTray) xAdq+$><
DeleteIcon(); d>i13dAI
CDialog::OnCancel(); Z`_.x
&Y
} h'5Cp(G
%FA@)?~
void CCaptureDlg::OnAbout() t9
F=^)s
{ h%}(h2W
CAboutDlg dlg; <[Oo*:A!7
dlg.DoModal(); Fwfo2
} *y7 $xa4
Y94MI1O5$
void CCaptureDlg::OnBrowse() H5xzD9K;/C
{ x0+glQrNN
CString str; LI
W*4r!
BROWSEINFO bi; iS: #o>
char name[MAX_PATH]; Faac]5u:*
ZeroMemory(&bi,sizeof(BROWSEINFO)); "QY1.:o<(
bi.hwndOwner=GetSafeHwnd(); 9]yW_]P
bi.pszDisplayName=name; CjZ2z%||=
bi.lpszTitle="Select folder"; rY}B-6qJn
bi.ulFlags=BIF_RETURNONLYFSDIRS; b`~wGe
LPITEMIDLIST idl=SHBrowseForFolder(&bi); +!O-kd
if(idl==NULL) p^QZ q>v
return; W|UtY`1
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); D<):ZfUbI
str.ReleaseBuffer(); shFc[A,r}
m_Path=str; H{zPft
if(str.GetAt(str.GetLength()-1)!='\\') :7b-$fm
m_Path+="\\"; ;#QhQx
UpdateData(FALSE); &O1v,$}'
} (FVX57
,=By$.rr'
void CCaptureDlg::SaveBmp() T@48 qg
{ q)I|2~Q c^
CDC dc; yYTVXs`fVj
dc.CreateDC("DISPLAY",NULL,NULL,NULL); A"l{?;~
CBitmap bm; "yh Pm
int Width=GetSystemMetrics(SM_CXSCREEN); ~"dhu]^
int Height=GetSystemMetrics(SM_CYSCREEN); ?J&)W,~
bm.CreateCompatibleBitmap(&dc,Width,Height); RQ'
H!(K
CDC tdc; J=}F2C
tdc.CreateCompatibleDC(&dc); vXcy#
CBitmap*pOld=tdc.SelectObject(&bm); 7_)|I?
=0d
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); At9X]t
tdc.SelectObject(pOld); }T(z4P3
BITMAP btm; G\~^&BAC
bm.GetBitmap(&btm); *xH\)|3,
DWORD size=btm.bmWidthBytes*btm.bmHeight; )"u:ytK{
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); V2 `>
]/|
BITMAPINFOHEADER bih; n9oR)&:o
bih.biBitCount=btm.bmBitsPixel; b|?;h21rG
bih.biClrImportant=0; F!g;A"?V
bih.biClrUsed=0; w~@[r4W
bih.biCompression=0; s>[{}7ca
bih.biHeight=btm.bmHeight; p@I9<^"
bih.biPlanes=1; h)dRR_
bih.biSize=sizeof(BITMAPINFOHEADER); /1.rz{wpb
bih.biSizeImage=size; U{#xW
bih.biWidth=btm.bmWidth; iuAq.$oi{
bih.biXPelsPerMeter=0; \{v,6JC
bih.biYPelsPerMeter=0; ; B$*)X9
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); L.)yXuo4
static int filecount=0; >)c9|e=8
CString name; d-$_|G+
name.Format("pict%04d.bmp",filecount++); ]+%=@mWYs
name=m_Path+name; ecFi(eMD
BITMAPFILEHEADER bfh; ~@9zil41
bfh.bfReserved1=bfh.bfReserved2=0; >FFVY{F
bfh.bfType=((WORD)('M'<< 8)|'B'); %$9bce-fcG
bfh.bfSize=54+size; )%j"
bfh.bfOffBits=54; `XMM1y>V9>
CFile bf; T.Zz;2I
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;}4k{{K
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L;)v&a7[P
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));
WL-0(
bf.WriteHuge(lpData,size); GU6qIz|
bf.Close(); Lb~\Yn'z
nCount++; {bkGYx5.C
} X;EJ&g/
GlobalFreePtr(lpData); !$>G#+y
if(nCount==1) KwFXB
m_Number.Format("%d picture captured.",nCount); h~UJCnzS
else u,9q<&,
m_Number.Format("%d pictures captured.",nCount); e\N0@
UpdateData(FALSE); }$aNOf%:
} ;`j U_
vm}G[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8S>>7z!U
{ {D(,ft;s^
if(pMsg -> message == WM_KEYDOWN) yazZw}};
{ 3$_2weZxYn
if(pMsg -> wParam == VK_ESCAPE) UR:n5V4
return TRUE; 0wvU?z%WK
if(pMsg -> wParam == VK_RETURN) JDhwN<0R
return TRUE; 9d\N[[Vu]R
} L82NP)St
return CDialog::PreTranslateMessage(pMsg); x#
8IZ
} h48 bb.p2
E .;io*0
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {B^pnLc
{ 4ftj>O
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zoXuFg
SaveBmp(); >hb-5xC
return FALSE; v"
FO
} AM/lbMr
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ FsY`nWwg
CMenu pop; A- 0m8<
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); SLh~_ 5
CMenu*pMenu=pop.GetSubMenu(0); e"_"vbk
pMenu->SetDefaultItem(ID_EXITICON); UK:M:9
CPoint pt; 0w}{(P;
GetCursorPos(&pt); ]h8/M7k
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L>:FGNf^H
if(id==ID_EXITICON) jt%WPkY:
DeleteIcon(); "1%*'B^}bw
else if(id==ID_EXIT) cYD1~JX.
OnCancel(); `~E<Sf<M
return FALSE; 5f3!NeI
} *a4
b
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :SeLkQC
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Tw}z7U"
AddIcon(); mxhW|}_-j
return res; OfLM
} ]+,nA R
9OZ>y0)K~
void CCaptureDlg::AddIcon() )$F6
{ 1gAc,s2
NOTIFYICONDATA data; z1qUz7
data.cbSize=sizeof(NOTIFYICONDATA); u]#8$M2
CString tip; O3}P07
tip.LoadString(IDS_ICONTIP); 9/H^t*5t
data.hIcon=GetIcon(0); x`3.Wu\
data.hWnd=GetSafeHwnd(); R\
e#$"a5
strcpy(data.szTip,tip); 6\mC$: F
data.uCallbackMessage=IDM_SHELL; 2w7@u/OC'
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9BurjG1k?
data.uID=98; KM@`YV_"g
Shell_NotifyIcon(NIM_ADD,&data); yh$ ~*UV
ShowWindow(SW_HIDE); gyg|Tno
bTray=TRUE; 4sQ~&@[Q+
} Bf(Mot^
04[)qPPS
void CCaptureDlg::DeleteIcon() dcR6KG 8
{ G`WzJS*}v
NOTIFYICONDATA data; #nDL
data.cbSize=sizeof(NOTIFYICONDATA); 5Wl,J _<F
data.hWnd=GetSafeHwnd(); (ai72#nFtb
data.uID=98; C64eDX^
Shell_NotifyIcon(NIM_DELETE,&data); s9kTuhoK
ShowWindow(SW_SHOW); wEv*1y4
SetForegroundWindow(); rl41#6
ShowWindow(SW_SHOWNORMAL); a6 * Y%?
bTray=FALSE; {cX7<7N
} B8>FCF&}E
9XY|V<}
void CCaptureDlg::OnChange() "$4hv6 s
{ G dL4|xv
RegisterHotkey(); 3XBp6`
} U(8I+xZ
25w6KBTe;:
BOOL CCaptureDlg::RegisterHotkey() Ic_t c
{ H8x:D3C0
UpdateData(); 1=- X<M75
UCHAR mask=0; H|x k${R`
UCHAR key=0; X.:_"+I;
if(m_bControl) w7Pe
mask|=4; _i#@t7
if(m_bAlt) Mj,2\ijNM
mask|=2; e4 ?<GT
if(m_bShift) ?WMi S]Q\
mask|=1; jCam,$oE
key=Key_Table[m_Key.GetCurSel()]; }%
FDm@+
if(bRegistered){ }.w#X
DeleteHotkey(GetSafeHwnd(),cKey,cMask); >n#g9v K
bRegistered=FALSE; VQ/ <09e
} *%z<P~}
cMask=mask; 2>`m<&y
cKey=key; ^glbxbhI4
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1h&)I%`?
return bRegistered; P=}H1#
} zl,bMtQ
M55e=
四、小结 %y!
U3(L.8(sA
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。