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:
O*v&CHd3
>3p~>;9sc 一、实现方法
i{m!v6j: Q>D//_TF 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:
H?O5 "4a q{`1[R #pragma data_seg("shareddata")
/69yR HHOOK hHook =NULL; //钩子句柄
"LTw;& y UINT nHookCount =0; //挂接的程序数目
)T"Aji-hy static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
nQQHm6N static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
.mfLH N%: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
oc)`hg2= static int KeyCount =0;
;4!H- qZ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
MlYm\x8{M #pragma data_seg()
QOEi.b8r `bBkPH}M 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。
0?$|F0U"J F oC
$X DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
|;NfH|43; *-PjcF}Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
e4N d cKey,UCHAR cMask)
^7\kvW {
x?o#}:S BOOL bAdded=FALSE;
RAl/p9\A+ for(int index=0;index<MAX_KEY;index++){
?:3hp2k< if(hCallWnd[index]==0){
n4!RGq.} hCallWnd[index]=hWnd;
.iy>N/u HotKey[index]=cKey;
3v\P6 HotKeyMask[index]=cMask;
%JrZMs> bAdded=TRUE;
+Kb 7N, " KeyCount++;
g,]o+nT break;
ViiJDYT>E< }
('J@GTe@xj }
Q k}RcP return bAdded;
Vm<_e }
7(]F+\A3 //删除热键
4ams~ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
C<C$df
{
{,JO}Dmu5 BOOL bRemoved=FALSE;
Mq<ob+ for(int index=0;index<MAX_KEY;index++){
Ic4#Tk20i if(hCallWnd[index]==hWnd){
?Fx~_GT if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
hhaiHi!$ hCallWnd[index]=NULL;
]?+i6 [6U HotKey[index]=0;
X PyDZk/m HotKeyMask[index]=0;
Qu[QcB{ro- bRemoved=TRUE;
m[xl)/e KeyCount--;
ZN#b5I2Pf break;
8)bR\s }
cy.r/Z} }
~D3S01ecM }
s>o#Ob@4' return bRemoved;
)KE }
&*>.u8:r :.ZWYze mq[=,,# DLL中的钩子函数如下:
0Qa0 Y[f]L4,V LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
avq$aq(3& {
`sqr>QD BOOL bProcessed=FALSE;
>\[]z^J if(HC_ACTION==nCode)
OiQf=Uz\ {
:wS&3:h if((lParam&0xc0000000)==0xc0000000){// 有键松开
NH|I>vyN switch(wParam)
_cQ
'3@ {
pZ'q_Oux case VK_MENU:
KxK,en4)+ MaskBits&=~ALTBIT;
OU UV8K break;
:W, S case VK_CONTROL:
6}-No MaskBits&=~CTRLBIT;
W"Y)a|rG% break;
y@7fR9hp< case VK_SHIFT:
I9zs MaskBits&=~SHIFTBIT;
A]!0Z:{h% break;
9oJM?&i default: //judge the key and send message
s0dP3tz> break;
,Tr&`2w }
3`yO&upk for(int index=0;index<MAX_KEY;index++){
kyAN O if(hCallWnd[index]==NULL)
xH\\#4/ continue;
L0"|4= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0\XWdTj{ {
eZOR{|z SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
.4^+q9M bProcessed=TRUE;
_aevaWtEx }
\85%d0@3 }
}y6@YfV${ }
nDdY~f.B else if((lParam&0xc000ffff)==1){ //有键按下
~'lT8 n_ switch(wParam)
kVQm|frUz {
Ztmh z_u7 case VK_MENU:
=!q]0# MaskBits|=ALTBIT;
F2}Fuupb. break;
ybiTWM case VK_CONTROL:
7JBs7LG MaskBits|=CTRLBIT;
aC[G_ACwc break;
cxs@ph&Wk case VK_SHIFT:
$B-/>Rz MaskBits|=SHIFTBIT;
0RA#Y(IR break;
B{&W|z{$ default: //judge the key and send message
L@GICW~ break;
LHA^uuBN} }
]%D!-[C%1 for(int index=0;index<MAX_KEY;index++){
yS~Y"#F!. if(hCallWnd[index]==NULL)
UUDUda continue;
+@?Q "B5u} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>`UqS`YQK {
dP_QkO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>hNSEWMY` bProcessed=TRUE;
CWkWW/ZI }
"}Om0rB}1 }
'O)v@p " }
<@(\z
if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
>u>
E !5O for(int index=0;index<MAX_KEY;index++){
b\ED<' if(hCallWnd[index]==NULL)
:bct+J}l~ continue;
O80Z7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
T+Re1sPr? SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>
Hv9Xz //lParam的意义可看MSDN中WM_KEYDOWN部分
`3\U9ZH23 }
I%r7L }
Y9X,2L7V }
E>QS^)ih return CallNextHookEx( hHook, nCode, wParam, lParam );
S|tA%2z }
k*;U?C! 5%2~/
" 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:
'S6zk wC] EM@|^47$ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0bh
6ay4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
r5s{t4 ;Ch -Ct+W;2 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:
c9[{P~y 3iw3:1RZUZ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
d~QKZ&jf {
acS~%^"<_ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
sC\?{B0r
{
WDghlC6g!l //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
d[l8qaD SaveBmp();
B bmw[Qf\ return FALSE;
@@\qso }
DL V ny] …… //其它处理及默认处理
ppIXS( }
'Grej8 .)tQ&2
;U4O` pZ 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。
uxxk&+M [,Rc&7p~R 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。
1sg:8AA cZN<}n+q 二、编程步骤
h!dij^bD 17'd~-lE 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";
t8RtJ2; eg*a Vb 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
)8^E{w^D} T^^7@\vDI 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;
=M?+KbTJ3
bMc[0 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#u{th q'S[TFMNE 5、 添加代码,编译运行程序。
+Iuu8t } OIe! 三、程序代码
%G(VYCeK :7X4VHw/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
;L fn&2G #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
392(N( #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
UUz{Qm% #if _MSC_VER > 1000
;V~x[J|x #pragma once
olQP>sa #endif // _MSC_VER > 1000
W>!:K^8] #ifndef __AFXWIN_H__
dn'|~zf. #error include 'stdafx.h' before including this file for PCH
Sm {Sq #endif
VTL_I^p #include "resource.h" // main symbols
[H\0
' class CHookApp : public CWinApp
r[ k {
<[ dt2)%L> public:
" TCJT390 CHookApp();
h(kPf]0 // Overrides
wclj9&k // ClassWizard generated virtual function overrides
jl}9R]Y_2 //{{AFX_VIRTUAL(CHookApp)
J1(SL~e], public:
~c v|, virtual BOOL InitInstance();
+vJ}'uR3P virtual int ExitInstance();
g
\S6>LG! //}}AFX_VIRTUAL
F\&wFA'J //{{AFX_MSG(CHookApp)
56YqYu. // NOTE - the ClassWizard will add and remove member functions here.
='.b/]! _ // DO NOT EDIT what you see in these blocks of generated code !
0
J"g"= //}}AFX_MSG
u `w w DECLARE_MESSAGE_MAP()
l$!ExXEZO; };
V"8Go;[ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
&&$*MHJ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
T0fm6
J BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~h<T0Zc BOOL InitHotkey();
XC<'m{^(m BOOL UnInit();
\'g7oV;>cI #endif
wG:RvgX} <z60EvHg //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7>zUT0SS #include "stdafx.h"
[H!do$[> #include "hook.h"
u)EtEl7Wq #include <windowsx.h>
LR.]&(kyd #ifdef _DEBUG
b"o\-iUioe #define new DEBUG_NEW
|#t^D.j #undef THIS_FILE
0u"j^v static char THIS_FILE[] = __FILE__;
U43U2/^ #endif
Vq#0MY)2gS #define MAX_KEY 100
}t(5n $go6 #define CTRLBIT 0x04
@ukL!AV?Y #define ALTBIT 0x02
]7,0> #define SHIFTBIT 0x01
rvhMu}. #pragma data_seg("shareddata")
'Kmf6iK>[ HHOOK hHook =NULL;
1)}hzA UINT nHookCount =0;
WUYU\J&q3 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
7^.g\Kt? static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
SsMs#C8u% static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
n|.eL8lX.< static int KeyCount =0;
zvnd@y{[ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
?Nt m5(R #pragma data_seg()
LhF;A~L HINSTANCE hins;
0ZD)(ps| void VerifyWindow();
0%rE*h9+ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
VtN@B* //{{AFX_MSG_MAP(CHookApp)
~_CZ1 // NOTE - the ClassWizard will add and remove mapping macros here.
oKkDG|IE // DO NOT EDIT what you see in these blocks of generated code!
2GigeN|1N //}}AFX_MSG_MAP
\qW^AD(it< END_MESSAGE_MAP()
USgO`l\}4 u1'l4VgT CHookApp::CHookApp()
SdI> {
@GweNo`p7 // TODO: add construction code here,
>;M STHeW // Place all significant initialization in InitInstance
W>CG;x{ }
c.-dwz "_rpErm
} CHookApp theApp;
P
2x.rukT| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
~}D"8[ABj {
Ly`.~t(~l BOOL bProcessed=FALSE;
/_(l:q^ if(HC_ACTION==nCode)
?6\A$? {
Wb^g{F!W if((lParam&0xc0000000)==0xc0000000){// Key up
PEtr8J$uB switch(wParam)
bV)h\:oC {
W-1Ub |8C case VK_MENU:
LmR OG-9 MaskBits&=~ALTBIT;
apxq] !
` break;
oB!-JX9 case VK_CONTROL:
V22Br#+ MaskBits&=~CTRLBIT;
cR6#$-a break;
We"\nOP case VK_SHIFT:
Co<F<eXe MaskBits&=~SHIFTBIT;
>o"0QD break;
Es:oXA default: //judge the key and send message
P=4o)e7E! break;
Zq/=uB7Z }
~05(92bK for(int index=0;index<MAX_KEY;index++){
@A%\;oo if(hCallWnd[index]==NULL)
C !Lu`y continue;
\xk8+= /A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-A"0mS8L {
te3\MSv;O SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
d^aLue>g;+ bProcessed=TRUE;
`v Ebm Xb }
Uv:NY1(3! }
[k,FJ5X }
d+7Dy3i|g= else if((lParam&0xc000ffff)==1){ //Key down
n]_<6{: U switch(wParam)
?trqe/ {
G"prq& case VK_MENU:
R8u9tTW MaskBits|=ALTBIT;
% ELf7~ break;
|0N1]Hf case VK_CONTROL:
==W] 1@s MaskBits|=CTRLBIT;
u6p
nO break;
4,6nk.$yN case VK_SHIFT:
`SESj)W(y MaskBits|=SHIFTBIT;
Ha!]*wg# break;
oIY@xuj default: //judge the key and send message
')v<MqBr break;
TSYe~)I }
rWzO>v for(int index=0;index<MAX_KEY;index++)
vqBT^Q_q; {
[-x]% if(hCallWnd[index]==NULL)
!pe!Z-, continue;
*}N J if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
$x1PU67 {
R`emI7| SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%y2i1^ bProcessed=TRUE;
bp(X\:zAy }
}^3ICwzm }
9iQc\@eGd }
P<gr=& if(!bProcessed){
!T8h+3I for(int index=0;index<MAX_KEY;index++){
hj-#pL-t if(hCallWnd[index]==NULL)
Nm=\~LP90 continue;
XnI)s^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
9"mcN3x:\e SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
"G
@(AE( }
92K#xM/ }
M%Dv-D{ }
/\1MG>#K return CallNextHookEx( hHook, nCode, wParam, lParam );
_^pg!j[Fy} }
XDrNc!XN "~zQN(sR"P BOOL InitHotkey()
LZG~1tf {
vT>ki0P_; if(hHook!=NULL){
X$4 5<oz nHookCount++;
Y^W.gGM return TRUE;
u|a+:r)*4 }
.V:H~ else
hJ1: #%Qe. hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
w-.=u3 if(hHook!=NULL)
m"Y|xvIA nHookCount++;
BJi return (hHook!=NULL);
2K1odqO# }
K1K3s<y+ BOOL UnInit()
OCVF+D : {
E
_DSf if(nHookCount>1){
SecZ5(+= nHookCount--;
- &/n[EE return TRUE;
+WP }
m!-,K8 BOOL unhooked = UnhookWindowsHookEx(hHook);
H7"m/Bia if(unhooked==TRUE){
<_"^eF+fZ nHookCount=0;
j3`"9bY hHook=NULL;
'YcoF;&[C }
* -Kf return unhooked;
AK*F,H9 }
` E2@GX+, ~ST7@-D0 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9"YOj_z {
wKq-|yf, BOOL bAdded=FALSE;
Iq-+X3i for(int index=0;index<MAX_KEY;index++){
mzl %h[9iI if(hCallWnd[index]==0){
KF[P
/cFI hCallWnd[index]=hWnd;
/J"U`/
{4 HotKey[index]=cKey;
n"1LVJN7 HotKeyMask[index]=cMask;
^&W(|R-,J& bAdded=TRUE;
pv2u.qg5z KeyCount++;
T*%Q s&x; break;
\666{. a }
{T]^C }
tC=`J%Ik return bAdded;
K)AJx" }
C>vp
oCA d +Vx:`tT BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
OI9V'W$ {
Er6'Ig|U BOOL bRemoved=FALSE;
:-=,([TJ for(int index=0;index<MAX_KEY;index++){
/OpVr15 if(hCallWnd[index]==hWnd){
4q`$nI Bi if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
(\ze
T5 hCallWnd[index]=NULL;
P-?ya!@" HotKey[index]=0;
y/ #{pyJ HotKeyMask[index]=0;
*jps}uk< bRemoved=TRUE;
TqM(I[J7\ KeyCount--;
R~$W break;
fJ3*'( }
l0m\2Ttf }
$~|#Rz%v }
:dtX^IT return bRemoved;
Sn\S`D }
7B`,q-x. D|u! KH void VerifyWindow()
)vFJx[a<n` {
wj fk > for(int i=0;i<MAX_KEY;i++){
jrMY]Ea2` if(hCallWnd
!=NULL){ r?s,
if(!IsWindow(hCallWnd)){ 38wt=0br
hCallWnd=NULL; +6=2B0$
r
HotKey=0; KrhAObK
HotKeyMask=0; Mb6#97
KeyCount--; yB&+2
} mr+J#
} ydCVG,"
} p:9)}y
} KB$s7S"=
Xj/U~
BOOL CHookApp::InitInstance() !H`Q^Xf}
{ BTXS+mvl
AFX_MANAGE_STATE(AfxGetStaticModuleState()); [/}y!;3iXM
hins=AfxGetInstanceHandle(); %E95R8SL
InitHotkey(); :GU6v4u
return CWinApp::InitInstance(); edh?I1/
} qHGXs@*M&
y`?{2#1H
int CHookApp::ExitInstance() Im;8Abf
{ 9{?L3V!+r
VerifyWindow(); }nDKSC/[V!
UnInit(); JfmNI~%
return CWinApp::ExitInstance(); -uDB#?q:W
} D@V1}/$UoN
@_tQ:U,v
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file cSYW)c|t
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sE4=2p`x
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ HSk gS
#if _MSC_VER > 1000 ~RV>V*l
#pragma once } PD]e*z{Z
#endif // _MSC_VER > 1000 "p43#
ESk<*-
class CCaptureDlg : public CDialog l[EnFbD6
{ =qY!<DB[L
// Construction P=:mn>
public: ?=:wIMV
BOOL bTray; =#N;ZG
BOOL bRegistered; lMu}|d
BOOL RegisterHotkey(); jseyT#2
UCHAR cKey; c+PT"/3
UCHAR cMask; <szD"p|K
void DeleteIcon(); nJJ9>#<g$
void AddIcon(); Nf0'>`/
UINT nCount; %vjLw`
void SaveBmp(); o9dqHm
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Z^i=51
// Dialog Data R u^v!l`!7
//{{AFX_DATA(CCaptureDlg) C:qb-10|A
enum { IDD = IDD_CAPTURE_DIALOG }; O$}p}%%y7
CComboBox m_Key; Qe=,EXf
BOOL m_bControl; ]:CU.M1
BOOL m_bAlt; 6LUO
BOOL m_bShift; c}iVBN6~.<
CString m_Path; yc.Vm[!
CString m_Number; VUXG%511T
//}}AFX_DATA uT8@p8
// ClassWizard generated virtual function overrides t^HQ=*c
//{{AFX_VIRTUAL(CCaptureDlg) +NGjDa
public: acuch
virtual BOOL PreTranslateMessage(MSG* pMsg); sY4sq5'!
protected: %T]NM3|U
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IwC4fcZX6
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0be1aY;m&
//}}AFX_VIRTUAL SFrQPdX6V
// Implementation E#t;G:+A
protected:
zzsQfI#
HICON m_hIcon; v,Lv4)
// Generated message map functions P-9[,3Zd
//{{AFX_MSG(CCaptureDlg)
kt8P\/~*i
virtual BOOL OnInitDialog(); V[-4cu,Ph^
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^06f\7A
afx_msg void OnPaint(); w9I7pIIl
afx_msg HCURSOR OnQueryDragIcon(); IYm~pXg^0
virtual void OnCancel(); a!MhxM5
afx_msg void OnAbout(); L8K=Q
afx_msg void OnBrowse(); 5y7rY!]Bf
afx_msg void OnChange(); #3@ Du(_n
//}}AFX_MSG `Tt}:9/3
DECLARE_MESSAGE_MAP() 8H4"mxO
}; jEj#|w
#endif BKDs3?&
{9sA'5
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \|2 0E51B[
#include "stdafx.h" Dm=t`_DL8
#include "Capture.h" ea3;1-b:
#include "CaptureDlg.h" Ad)Po
#include <windowsx.h> 9] /xAsD
#pragma comment(lib,"hook.lib") m,nZrap
#ifdef _DEBUG _{CMWo"l
#define new DEBUG_NEW (vm&&a@
#undef THIS_FILE
'Eds0"3
static char THIS_FILE[] = __FILE__; {@Y|"qIN
#endif 74YMFI
#define IDM_SHELL WM_USER+1 8<(qN>R
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f}q4~NPn-
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z -|gw.y
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; <.j `n
class CAboutDlg : public CDialog 12 HBq8o
{ 7Iu^l4=2
public: OjxaA[$
CAboutDlg(); 2XhtK
// Dialog Data ,i>u>YNZ
//{{AFX_DATA(CAboutDlg) 3-cCdn
enum { IDD = IDD_ABOUTBOX }; }ge~Nu>w
//}}AFX_DATA DSG tt/n
// ClassWizard generated virtual function overrides WAPN,WuW
//{{AFX_VIRTUAL(CAboutDlg) :.kc1_veYS
protected: (_G&S~@.
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [+0rlmB
//}}AFX_VIRTUAL K#bd b
// Implementation T^LpoN/T
protected: }gL:"C"~
//{{AFX_MSG(CAboutDlg) (.Hiee43
//}}AFX_MSG ?>b>LDpx?
DECLARE_MESSAGE_MAP() % 1Y!|306
}; _DPWp,k<~
?sQOz[ig;
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) `N$:QWJ
{ utIR\e#:B
//{{AFX_DATA_INIT(CAboutDlg) W7I.S5
//}}AFX_DATA_INIT s*`_Ka57]~
} FqQqjA
gL%%2 }$
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S9~X#tpKe
{ j)4:*R.Z]
CDialog::DoDataExchange(pDX); :^7P. lhK
//{{AFX_DATA_MAP(CAboutDlg) <<#-IsT
//}}AFX_DATA_MAP OO?d[7Wt0
} 4]L5%=atn
K)z{R n
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Yud]s~N
//{{AFX_MSG_MAP(CAboutDlg) V1Yab#
// No message handlers eQh@.U*S)
//}}AFX_MSG_MAP *^j'G^n
END_MESSAGE_MAP() e~#;ux
I&9_F%rX
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) E6"+\-e
: CDialog(CCaptureDlg::IDD, pParent) Vfkm{*t)
{ j#^EZ/
//{{AFX_DATA_INIT(CCaptureDlg) l,cnMr^.W
m_bControl = FALSE; V+#Sb
m_bAlt = FALSE; W;~ f865
m_bShift = FALSE; G-`4TQ
m_Path = _T("c:\\"); zrt \]h+
m_Number = _T("0 picture captured."); RbPD3&.
nCount=0; 2aQR#lcv
bRegistered=FALSE;
4to)ff
bTray=FALSE; rG7E[kii
//}}AFX_DATA_INIT Dq=&K,5;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O@*7O~eO
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ><<(6
} )8`7i{F
\G}02h
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j\W"P_ dpd
{ ZL!,s#
CDialog::DoDataExchange(pDX); q-7C7q
//{{AFX_DATA_MAP(CCaptureDlg) 0,~f"Dyqy
DDX_Control(pDX, IDC_KEY, m_Key); R]{zGFnx
DDX_Check(pDX, IDC_CONTROL, m_bControl); Swugt"`nN
DDX_Check(pDX, IDC_ALT, m_bAlt); O&DkB*-
DDX_Check(pDX, IDC_SHIFT, m_bShift); c6v@6jzx0Y
DDX_Text(pDX, IDC_PATH, m_Path); m\9R;$\
DDX_Text(pDX, IDC_NUMBER, m_Number); xBba&A]=
//}}AFX_DATA_MAP %6A."sePO
} gcS?r :
N=Q<mj;,
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) r~mZ?dI
//{{AFX_MSG_MAP(CCaptureDlg) 2xPkQOj3
ON_WM_SYSCOMMAND() ;/ wl.'GA
ON_WM_PAINT() OS$}ej\
ON_WM_QUERYDRAGICON() ie<zc+*rW
ON_BN_CLICKED(ID_ABOUT, OnAbout) Uh6LU5
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8 $5
y]%!
ON_BN_CLICKED(ID_CHANGE, OnChange) YUGE>"{
//}}AFX_MSG_MAP n6A N
END_MESSAGE_MAP() }kJfTsFS
o%EzK;Df
BOOL CCaptureDlg::OnInitDialog() p\;\hHai
{ l=|>9,La
CDialog::OnInitDialog(); { XI 0KiE
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); EY$Dtb+g8
ASSERT(IDM_ABOUTBOX < 0xF000); " V[=U13
CMenu* pSysMenu = GetSystemMenu(FALSE); VtP^fM^{
if (pSysMenu != NULL) KU]co4]8^s
{ _#\e5bE=Z
CString strAboutMenu; 0H$6_YX4A
strAboutMenu.LoadString(IDS_ABOUTBOX); <x!q!;
if (!strAboutMenu.IsEmpty()) mS$9D{
{ }Z="}Dg|T
pSysMenu->AppendMenu(MF_SEPARATOR); 3!l+)g
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \eF_Xk[
} bk(q8xR`
}
%wFz4:
SetIcon(m_hIcon, TRUE); // Set big icon [c^!;YBp)
SetIcon(m_hIcon, FALSE); // Set small icon G_m $?0\
m_Key.SetCurSel(0); ]QU
9|1
RegisterHotkey(); &9+]{jXF
CMenu* pMenu=GetSystemMenu(FALSE); YYE{zU
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -R]Iu\
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;\]&k
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #r|qitL3
return TRUE; // return TRUE unless you set the focus to a control !1b}M/Wx
} (HEi;
9T\uOaC"
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lGlh/B%
{ \DiAfx<Ub
if ((nID & 0xFFF0) == IDM_ABOUTBOX) C6?({
QB@
{ [S~/lm
CAboutDlg dlgAbout; +TZVx(Z&A
dlgAbout.DoModal(); 0&~JC>S
} m
>Rdsn~l
else 5g q
{ pqCp>BO?O
CDialog::OnSysCommand(nID, lParam); Iq0[Kd0.j
} 3jqV/w[-
}
UVd
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Zt"#'1
void CCaptureDlg::OnPaint() bA-/"'Vp9
{ *V`E)maU
if (IsIconic()) B:>>D/O
{
@+6cKP
CPaintDC dc(this); // device context for painting c
W1`[b
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); aBd>.]l?
// Center icon in client rectangle ,bxGd!&{Q
int cxIcon = GetSystemMetrics(SM_CXICON); ;=UkTn}N?l
int cyIcon = GetSystemMetrics(SM_CYICON); 8U%y[2sT
CRect rect; hAV@/oQ
GetClientRect(&rect); =o)B1(v@.
int x = (rect.Width() - cxIcon + 1) / 2; :anR/
int y = (rect.Height() - cyIcon + 1) / 2; ri2`M\;gt
// Draw the icon JLbmh1'
dc.DrawIcon(x, y, m_hIcon); S^x?<kYQau
} v@d]*TG
else *7w,o?l
{ RhWW61!"
CDialog::OnPaint(); ~_F <"40
} ":_~(?1+
} hRNnj
<c&Nm_)
HCURSOR CCaptureDlg::OnQueryDragIcon() $!vK#8-&{
{ ;LC?3.
return (HCURSOR) m_hIcon; 7fC:'1]G
} )!lx'>0>
'si{6t|
void CCaptureDlg::OnCancel() 3ESrd"W=
{ 9DmFa5E
if(bTray) =PjxMC._
DeleteIcon(); Q0%s|8Jc
CDialog::OnCancel(); +xuj ]J
} z~th{4#E;
e8eNef L$
void CCaptureDlg::OnAbout() iEx4va-j
{ (sSGJS'X
CAboutDlg dlg; AHU=`z
dlg.DoModal(); RBLOc$2
} +*IRI/KUD
#fDM{f0]R
void CCaptureDlg::OnBrowse() t[/APm-k~>
{ as(Zb*PdH
CString str; ^vJy<
BROWSEINFO bi; m7u" awM^
char name[MAX_PATH]; ')TS'p,n
ZeroMemory(&bi,sizeof(BROWSEINFO)); HLC I
bi.hwndOwner=GetSafeHwnd(); {TvB3QOsj
bi.pszDisplayName=name; ovZ!}
bi.lpszTitle="Select folder"; )|GYxG;8C
bi.ulFlags=BIF_RETURNONLYFSDIRS; 6 $K@s
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3:>hHQi
if(idl==NULL) M }$Td_g
return; K,,'{j2#f
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); qFI19`?8E
str.ReleaseBuffer(); &YBZuq2?
m_Path=str; kz G W/
if(str.GetAt(str.GetLength()-1)!='\\') Hb[P|pPT
m_Path+="\\"; }tQ^ch; Q
UpdateData(FALSE); _:%i6c*"
} ]!uId#OH
C%|m[,Gx
void CCaptureDlg::SaveBmp() }lP`3e
{ @p@b6iLpO
CDC dc; $$XeCPs0
dc.CreateDC("DISPLAY",NULL,NULL,NULL); "8Lv
CBitmap bm; rN,T}M=2
int Width=GetSystemMetrics(SM_CXSCREEN); L^=G(op*
int Height=GetSystemMetrics(SM_CYSCREEN); <`u_O!h
bm.CreateCompatibleBitmap(&dc,Width,Height); i]Bu7Fuu
CDC tdc; F_0@Sh"
tdc.CreateCompatibleDC(&dc); fRHzY?n9;
CBitmap*pOld=tdc.SelectObject(&bm);
QQt4pDir>
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?XV3Y3
tdc.SelectObject(pOld); eCiI=HcW;
BITMAP btm; gfKv$~
bm.GetBitmap(&btm); NieNfurG%
DWORD size=btm.bmWidthBytes*btm.bmHeight; i7e_~K
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ltKMvGEF
BITMAPINFOHEADER bih; EeGTBVms
bih.biBitCount=btm.bmBitsPixel; _j*a5fsPU
bih.biClrImportant=0; :sttGXQX
bih.biClrUsed=0; <*9(m
bih.biCompression=0; !Sl_qL
bih.biHeight=btm.bmHeight; {q^UWv?1
bih.biPlanes=1; !JBj%| !
bih.biSize=sizeof(BITMAPINFOHEADER); .#Z"Sj
bih.biSizeImage=size; DG}s`'
bih.biWidth=btm.bmWidth; F,V|In
bih.biXPelsPerMeter=0; /&9R*xNST#
bih.biYPelsPerMeter=0; mW~*GD~r
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _h 6c[*
static int filecount=0; rs,'vV-2\
CString name;
qt6@]Y
name.Format("pict%04d.bmp",filecount++); {vT9I4d8
name=m_Path+name; *U$%mZS]1
BITMAPFILEHEADER bfh; c|K:oi,z
bfh.bfReserved1=bfh.bfReserved2=0; zZP/C
bfh.bfType=((WORD)('M'<< 8)|'B'); qj4jM7
bfh.bfSize=54+size; !,C8
bfh.bfOffBits=54; BO8?{~i
CFile bf; >nvnU`\
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y(#6nG@S
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z:^ S-h
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); LIKQQ
bf.WriteHuge(lpData,size); fWb+08}C
bf.Close(); :F9Oj1lM%
nCount++; R&$fWV;'
} K=r~+4F
GlobalFreePtr(lpData); Z{/GT7 /
if(nCount==1) t,Q"Pt?
m_Number.Format("%d picture captured.",nCount); /`0>U
else 6G}4KGQc
m_Number.Format("%d pictures captured.",nCount); t/3HX]B_
UpdateData(FALSE); 4TYtgP1
} oKH+Q6S:
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +1@'2w{
{ mD|Q+~=|e
if(pMsg -> message == WM_KEYDOWN) x 0#u2j?zj
{ i r'C(zD=
if(pMsg -> wParam == VK_ESCAPE) $=`d[04
return TRUE; _g-0"a{-
if(pMsg -> wParam == VK_RETURN) fJ6Q:7
return TRUE; a 7=lZZ?
} ;),,Hk
return CDialog::PreTranslateMessage(pMsg); 6urU[t1
} E25w^x2
Rg+#(y
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C\OZs%]At
{ Mz86bb^J
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ WF_QhKW|k
SaveBmp(); UJ(UzKq8
return FALSE; TtH!5{$s
} ,?HM5c{'[Y
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {oR@'^N
CMenu pop; ?RW1%+[
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K-K>'T9F}
CMenu*pMenu=pop.GetSubMenu(0); HLdHyK/S
pMenu->SetDefaultItem(ID_EXITICON); iq^;c syKb
CPoint pt; atmW? Z
GetCursorPos(&pt); K4+|K:e
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2?v }w<Ydl
if(id==ID_EXITICON) YU!s;h
DeleteIcon(); P=L@!F+s
else if(id==ID_EXIT) @,-D
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OnCancel(); -M_>]ubG
return FALSE; K
V
} %iJ}H6m
LRESULT res= CDialog::WindowProc(message, wParam, lParam); >oaL -01i
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6j+X@|2^
AddIcon(); "WO0rh`
return res; TJ_6:;4,|_
} 7,8TMd1`M
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void CCaptureDlg::AddIcon() pn){v
{ w`3.wALb
NOTIFYICONDATA data; eT ]*c?"
data.cbSize=sizeof(NOTIFYICONDATA); #F2DEo^0
CString tip; (x.qyYEoI
tip.LoadString(IDS_ICONTIP); AN[pjC<
data.hIcon=GetIcon(0); rg]b$tL~
data.hWnd=GetSafeHwnd(); $ndBT+i
strcpy(data.szTip,tip); g}K/ba'
data.uCallbackMessage=IDM_SHELL; D!Nc&|X^
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; hE'7M;
data.uID=98; Eb63O
Shell_NotifyIcon(NIM_ADD,&data); X}C8!LA
ShowWindow(SW_HIDE); .*>C[^
bTray=TRUE; X.,R%>O}`P
} IB 4L(n1
1p&=tN
void CCaptureDlg::DeleteIcon() t}pYSSTz
{ Gv
}
NOTIFYICONDATA data; },Grg~l
data.cbSize=sizeof(NOTIFYICONDATA); G{Ju2HY
data.hWnd=GetSafeHwnd(); 0Q,Tcj
data.uID=98; gSyBoY
Shell_NotifyIcon(NIM_DELETE,&data); yv>uzb`N
ShowWindow(SW_SHOW); {TMng&
SetForegroundWindow(); qs_cC3"=%=
ShowWindow(SW_SHOWNORMAL); /RxqFpu|.
bTray=FALSE; p|a`Q5z!
} Zu4CFX-4
P6ka'!z
void CCaptureDlg::OnChange() wgvCgr<
{ |Zp')
JiS
RegisterHotkey(); |UQ[pas
} US-f<Wq
Sz')1<
BOOL CCaptureDlg::RegisterHotkey() p:{L fQ
{ o54=^@>O<j
UpdateData(); Az#kE.8b*A
UCHAR mask=0; f(!cz,y^\*
UCHAR key=0; xCT2FvX6
if(m_bControl) d/$e#8
mask|=4; sE|8a
if(m_bAlt) VsK8 :[Al
mask|=2; $kMe8F_
if(m_bShift) ?6x&A t
mask|=1; yGC
HWP
key=Key_Table[m_Key.GetCurSel()]; (I>S qM
Y
if(bRegistered){ cd=H4:<T5
DeleteHotkey(GetSafeHwnd(),cKey,cMask); p?P.BU\CR
bRegistered=FALSE; m6xbO
} M\IdQY-c
cMask=mask; o:
> (Tv
cKey=key; mRGr+m
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nKtRJ,>
return bRegistered; :fy,%su
} _z.CV<
s*i,Ph
四、小结 Lk^bzW>f
.N\t3\9}
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。