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:
NC@OmSR\0
W[w8@OCNf 一、实现方法
?5jkb trtI^^/% 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:
tE=P9 \4 D]Bvjh #pragma data_seg("shareddata")
yC6XO&:g HHOOK hHook =NULL; //钩子句柄
/&cb`^"U^ UINT nHookCount =0; //挂接的程序数目
|f?tyQ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
bC)diC static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
{b=]JPE static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
![{> f6{J static int KeyCount =0;
q%8,@xg static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
;~#rdL #pragma data_seg()
*|a_(bQ4@ Nt'(JAZ; 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。
)TBBYCL3 *:aJlvk 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:
Ql3hq.E /\_0daUx BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
[#M^:Q cKey,UCHAR cMask)
D CcM~ {
]'EtLFv) BOOL bAdded=FALSE;
.@gv}`> for(int index=0;index<MAX_KEY;index++){
s+h`,gg9 if(hCallWnd[index]==0){
u-f_,],p hCallWnd[index]=hWnd;
^<.mUaP HotKey[index]=cKey;
yL7a*C& HotKeyMask[index]=cMask;
)$]_;JFr bAdded=TRUE;
A8dIL5 KeyCount++;
VSL6tQp break;
/RIvUC1 }
<A; R%\V }
{I&>`?7. return bAdded;
b(wW;C'#0p }
y.=ur,Nd //删除热键
pGc_Klq BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
am]$`7R5d {
V{HP8f91 BOOL bRemoved=FALSE;
t"cGv32b for(int index=0;index<MAX_KEY;index++){
Rs$k3 if(hCallWnd[index]==hWnd){
Cb%?s if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
MRMswNQ hCallWnd[index]=NULL;
+ng8!k HotKey[index]=0;
`b=?z%LuT HotKeyMask[index]=0;
!iN=py bRemoved=TRUE;
}Dc0 Y KeyCount--;
$-Lk,}s.* break;
!_3Rd S }
Uf}s6# }
F4xYfbwY"] }
-NHA{?6r return bRemoved;
Mj&q"G }
T>7$<ulm {dM18;
] lE6:^V DLL中的钩子函数如下:
_z4c7_H3 ]vo&NE LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
'H+H4( {
fjVGps$j BOOL bProcessed=FALSE;
(RW02%`jjy if(HC_ACTION==nCode)
:s`~m;Y9? {
!C]0l if((lParam&0xc0000000)==0xc0000000){// 有键松开
H`odQkZ! switch(wParam)
KSe`G;{ {
3WZdP[o! case VK_MENU:
q,w8ca4~y MaskBits&=~ALTBIT;
7D PKKvQ break;
R >f$*T
case VK_CONTROL:
96x$Xl; MaskBits&=~CTRLBIT;
BQmHYar break;
dF$a52LS case VK_SHIFT:
FRqJ#yd] MaskBits&=~SHIFTBIT;
kcGs2Y_*& break;
hfw$820y[ default: //judge the key and send message
}i0(^"SoXZ break;
ye!}hm=w }
:)hS-*P for(int index=0;index<MAX_KEY;index++){
Qk 2^p^ T6 if(hCallWnd[index]==NULL)
QT)D|]bH continue;
~IrrX,mp: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
tl5}#uJ {
fl%X>\i/7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
!ZlBM{C bProcessed=TRUE;
Zt;3HY=y }
T:k-`t0":N }
$<'i+kK }
V/xGk9L~ else if((lParam&0xc000ffff)==1){ //有键按下
]'+PJdA switch(wParam)
r:.3P {
m?wPZ^u case VK_MENU:
%N``EnF2 MaskBits|=ALTBIT;
{6}H}_(] break;
euO!vLd X case VK_CONTROL:
3Ov? kWFO MaskBits|=CTRLBIT;
mY!os91KoO break;
6_xPk`m case VK_SHIFT:
BOqu$f+ MaskBits|=SHIFTBIT;
:K
J#_y\rt break;
y*ux7KO default: //judge the key and send message
Ed6k7 break;
E&js`24 & }
M18<d1* for(int index=0;index<MAX_KEY;index++){
a@+n if(hCallWnd[index]==NULL)
m][i-|@M continue;
IXQxjqd^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
j'xk[bM {
l6kq P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
%<[?; bProcessed=TRUE;
Rb!V{jQ }
R1A|g=kF }
MLVrL r t }
8nKZ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
{|:ro!& for(int index=0;index<MAX_KEY;index++){
-l)u`f^n| if(hCallWnd[index]==NULL)
f&5'1tG continue;
4o|-v if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Cf&.hod SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
T-.Q //lParam的意义可看MSDN中WM_KEYDOWN部分
Nj~3FL }
}fqz8'E9 }
b"J J3$D }
<.d^jgG(j return CallNextHookEx( hHook, nCode, wParam, lParam );
Ng=_#< }
,\".|m1o. 3n ~n-Jo 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
DAvF ND$= Ej;BI#gx= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Wjf,AjL\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
LN!e_b cJ^:b4j 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:
)P|&o%E j*7#1<T LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
/);S?7u. {
h!yI(cY if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
K*"Wq:T;B {
8(jUCD //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
39!$x[ SaveBmp();
I=;.o> return FALSE;
n^xB_DJ~ }
]i)g!J8f- …… //其它处理及默认处理
*PF}L%K(? }
&N+i3l6` z\F#td{ r O5v)}4 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。
8c%Sd'+Pt Vs"1:gi& 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。
dX^d\
wX $eSSW+8q" 二、编程步骤
(gQr?K x 8_nLZ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
3_ P<0% J]-z7<j'] 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
jl)7Jd %@,!
( 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
.@`5>_ ^T< HD 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
@
=XJ< g^mnYg5 5、 添加代码,编译运行程序。
fvNj5Vq: ~c\iBk 三、程序代码
JjC&
io )?$zY5 ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
FPC^-mD #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
-TT{4\%s #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
N'@E^
rYc #if _MSC_VER > 1000
:G8:b. #pragma once
|!?lwBs4 #endif // _MSC_VER > 1000
#*~3gMI{= #ifndef __AFXWIN_H__
,bRYqU?#0 #error include 'stdafx.h' before including this file for PCH
.Z9{\tj #endif
hf1h*x^J #include "resource.h" // main symbols
VEGp!~D class CHookApp : public CWinApp
t4H*&U {
bQ`|G(g-d public:
S0]JeP+3! CHookApp();
IW$ qP&a // Overrides
9\S,$A{{* // ClassWizard generated virtual function overrides
2,^U8/ //{{AFX_VIRTUAL(CHookApp)
i%3q*:A]2 public:
zEMZz$Y virtual BOOL InitInstance();
<KEVA?0> virtual int ExitInstance();
d cG)ql4d //}}AFX_VIRTUAL
6=3;(2u[C" //{{AFX_MSG(CHookApp)
Bgf'Hm%r // NOTE - the ClassWizard will add and remove member functions here.
r=4vN=: // DO NOT EDIT what you see in these blocks of generated code !
ph~d%/^jI //}}AFX_MSG
*Me&>"N" DECLARE_MESSAGE_MAP()
@;b @O
_ };
s*9lYk0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
=}OcMM`f BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
E06)&tF BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
w^=uq3X? BOOL InitHotkey();
8}.V[,]6 BOOL UnInit();
Y$<p_X, #endif
>E\U$}WCG @@ =e-d //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
iu.$P-s #include "stdafx.h"
$X ]t}= #include "hook.h"
z>A;|iL #include <windowsx.h>
D0*+7n3 #ifdef _DEBUG
Y0;66bfh} #define new DEBUG_NEW
z:)z]6 #undef THIS_FILE
.:9XpKbt static char THIS_FILE[] = __FILE__;
R^Y>v5jAe #endif
w%uM=YmuT #define MAX_KEY 100
rGgP9
( #define CTRLBIT 0x04
Mq Q'Kjo #define ALTBIT 0x02
2"pFAQBw~i #define SHIFTBIT 0x01
,UATT]> #pragma data_seg("shareddata")
Dwbt^{N^ HHOOK hHook =NULL;
PE&$2( UINT nHookCount =0;
G"|c_qX static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
c-`izn] static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
@E%fAC static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
X(qs]: static int KeyCount =0;
iM +p{/bN static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[t+qYe8 #pragma data_seg()
* amZ HINSTANCE hins;
^2-+MWW. void VerifyWindow();
^<`uyY))Q BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
+BgUnu26 //{{AFX_MSG_MAP(CHookApp)
C%q]o // NOTE - the ClassWizard will add and remove mapping macros here.
`^'0__<M // DO NOT EDIT what you see in these blocks of generated code!
@ev8"JZ1 //}}AFX_MSG_MAP
B]wfDUG END_MESSAGE_MAP()
$m[*)0/ @M=\u-jJ. CHookApp::CHookApp()
~^v*f {
$LHF=tYS // TODO: add construction code here,
KF}_|~~T // Place all significant initialization in InitInstance
&]jCoBj+_ }
K'zBDrkW-x iXD=_^^o . CHookApp theApp;
>d<tcaB LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
TLT6z[ {
!+Zso& BOOL bProcessed=FALSE;
3}x6IM2 if(HC_ACTION==nCode)
!HSX:qAP$ {
t6! B if((lParam&0xc0000000)==0xc0000000){// Key up
qLk7C0 switch(wParam)
H5/w!y@ {
,'a[1RN case VK_MENU:
ROj9#: MaskBits&=~ALTBIT;
22gh,e2o break;
N51WY7 case VK_CONTROL:
GEZ!z5";BQ MaskBits&=~CTRLBIT;
M6:$ 0(r break;
}ZkGH}K_} case VK_SHIFT:
Hr!%L*h? MaskBits&=~SHIFTBIT;
IIUTo break;
_GsHT\ default: //judge the key and send message
uYMH5Om+i break;
$x;(C[ }
`V=F>s$W for(int index=0;index<MAX_KEY;index++){
~NBlJULS if(hCallWnd[index]==NULL)
z2god 1" continue;
:8l#jU`y if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
nAk;a|Q {
mJa8;X!r6 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?7Skk bProcessed=TRUE;
Gn>~CoFN }
(k24j*1e$ }
GpGq' 8|( }
ldNWdz else if((lParam&0xc000ffff)==1){ //Key down
C)|#z/" switch(wParam)
,Laz515 {
3 ,
nr*R! case VK_MENU:
^=,N]
j MaskBits|=ALTBIT;
>IEc4 break;
?Y'r=Q{w case VK_CONTROL:
Rq,Fp/ MaskBits|=CTRLBIT;
e\WG-zi/ break;
DPylc9[- case VK_SHIFT:
?oulQR6: MaskBits|=SHIFTBIT;
P/ 7aj:h~P break;
2br~Vn0N default: //judge the key and send message
c2Up<#t break;
-< }#ImTN }
4<y|SI! for(int index=0;index<MAX_KEY;index++)
E9#.!re|^ {
[A46WF>L if(hCallWnd[index]==NULL)
G:Cgq\+R continue;
Rv@(
[rn+ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
GL'zNQP- {
;1L7+.A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
QIu!o,B bProcessed=TRUE;
</33>Fu) }
0;:AT|U/d }
7,,#f&jP }
Qm2(Z8Gh if(!bProcessed){
q-4#)EnW for(int index=0;index<MAX_KEY;index++){
wZ\% !#}7 if(hCallWnd[index]==NULL)
9Lqo^+0)\ continue;
TTm if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
GL8 N!, SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
!)h?2#V8; }
O*-sSf }
H'wh0K( }
Zm#qW2a]P return CallNextHookEx( hHook, nCode, wParam, lParam );
.Af H>)E }
F >co# }I
^e:,{ BOOL InitHotkey()
-K U@0G {
{pM3f if(hHook!=NULL){
Cswa5l`af nHookCount++;
egy#8U)Z return TRUE;
R4Si{J*O }
^9xsbv
B0 else
$-;x8O]u hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
.}DL%E`n if(hHook!=NULL)
C 8qVYrw nHookCount++;
<]kifiN# return (hHook!=NULL);
2-.%WhE/ }
~7"6Y] BOOL UnInit()
rBovC {
O!.mc=Gx7 if(nHookCount>1){
SM8m\c nHookCount--;
:R9 DJh\ return TRUE;
E?3$ *t }
{GM8}M~D& BOOL unhooked = UnhookWindowsHookEx(hHook);
}Q%fY(bp if(unhooked==TRUE){
<|_b: nHookCount=0;
Ax"I$6n> hHook=NULL;
8et.A }
DsH`I%w{ return unhooked;
3+| {O }
{;j@-=pV +)7Yqh#$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
o= N_0. {
}%I)bU BOOL bAdded=FALSE;
I\peO/w for(int index=0;index<MAX_KEY;index++){
um$ K^ if(hCallWnd[index]==0){
6
&)fZt hCallWnd[index]=hWnd;
g w`}eA$ HotKey[index]=cKey;
)XAD#GYM HotKeyMask[index]=cMask;
JdW:%,sv bAdded=TRUE;
jt8%
L[ KeyCount++;
"JCvsCe break;
Z`lCS
o; }
.4-I^W"1 }
x#s=eeP1 return bAdded;
ViG4tb }
M`kR2NCi H<6/i@ly BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
*|DIG{ {
pr(16P BOOL bRemoved=FALSE;
Ug|o($CY for(int index=0;index<MAX_KEY;index++){
Fl^}tC if(hCallWnd[index]==hWnd){
T c{]w?V if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
3e.v'ccK& hCallWnd[index]=NULL;
:,^pL At HotKey[index]=0;
'of5v6:8 HotKeyMask[index]=0;
#Ua+P(1q bRemoved=TRUE;
H21\6 GY KeyCount--;
#815h,nP+ break;
`+(|$?C u }
bUp
,vc* }
boR&'yX }
wGC)gW return bRemoved;
y`EcBf }
hp E? i-EFq@xl void VerifyWindow()
6QOdd6_d {
;=.QT for(int i=0;i<MAX_KEY;i++){
sgn,]3AUq if(hCallWnd
!=NULL){ <E|K<}W#
if(!IsWindow(hCallWnd)){ \
l+RX*
hCallWnd=NULL; eiF!yk?2
HotKey=0; <4W"ne28
HotKeyMask=0; a9q68
KeyCount--; L/w9dk*uv
} !(hP{k ^g
} :I5]|pt
} O]n"aAu@
} *My? l75
O\T
BOOL CHookApp::InitInstance() cf|<~7
{ +_?;%PKkuF
AFX_MANAGE_STATE(AfxGetStaticModuleState()); OjCT*qyU<
hins=AfxGetInstanceHandle(); b\%=mN
InitHotkey(); =>hq0F4[;
return CWinApp::InitInstance(); EO,;^RtB
} W&]grG2/
z+1#p.F$@
int CHookApp::ExitInstance() x, js}Mlw
{ @\_tS H
VerifyWindow(); '!!w|kd
UnInit(); Lrz>0_Q
return CWinApp::ExitInstance(); 0*%j6*XDq9
} S zOB{
Fz16m7.
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L;xc,"\3
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _VR Sdr5
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <}%>a@
#if _MSC_VER > 1000 r +;C}[E
#pragma once >Ge&v'~_|
#endif // _MSC_VER > 1000 RC8{QgaI
"JSg/optc
class CCaptureDlg : public CDialog ,SJB3if
{ qqSk*oH~
// Construction Xt/T0.I
public: )vsiX}3
BOOL bTray; H!&]Di1Eh
BOOL bRegistered; (^eSm]<
BOOL RegisterHotkey(); E`>-+~ZUsk
UCHAR cKey; Nm<3bd
UCHAR cMask; ]}F_nc2L
void DeleteIcon(); 6Pl$DSu
void AddIcon(); sRo%=7Z
UINT nCount; ~,Q+E8
void SaveBmp(); s_K:h
CCaptureDlg(CWnd* pParent = NULL); // standard constructor !5 %c`4
// Dialog Data G3 #c
//{{AFX_DATA(CCaptureDlg) #:{PAt
enum { IDD = IDD_CAPTURE_DIALOG }; D<}KTyG]
CComboBox m_Key; HPpKti7g
BOOL m_bControl; Qm,|'y:Tg
BOOL m_bAlt; VbK| VON[
BOOL m_bShift; R|8)iW^
CString m_Path; F%6al,8P
CString m_Number; G F,/<R #
//}}AFX_DATA T eG5|`t],
// ClassWizard generated virtual function overrides %|o4 U0c
//{{AFX_VIRTUAL(CCaptureDlg) 'HkV_d[li
public: UBi0
/
virtual BOOL PreTranslateMessage(MSG* pMsg); vhZpYW8
protected: &~G>pvZ
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Az6f I*yP
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,;H)CUe1"
//}}AFX_VIRTUAL lW?}jzuo
// Implementation $~50M5&K#
protected: Kw&J<H
HICON m_hIcon;
6I72;e^!
// Generated message map functions A%oHx|PD
//{{AFX_MSG(CCaptureDlg)
EdE,K1gD
virtual BOOL OnInitDialog(); {?l#*XH;
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,#UaWq@7
afx_msg void OnPaint(); #G|iEC0C
afx_msg HCURSOR OnQueryDragIcon(); cW26TtU(
virtual void OnCancel(); Cz
Jze
afx_msg void OnAbout(); yu<sd}@
afx_msg void OnBrowse(); O@'/B" &
afx_msg void OnChange(); a*NcL(OC
//}}AFX_MSG `K~300-hOb
DECLARE_MESSAGE_MAP() 1N1MD@C?P
}; ; @-7'%(C
#endif zy8W8h(?
d>)*!l2,C
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }9aYU;9D
#include "stdafx.h" 9Rzu0:r.,
#include "Capture.h" 7$a,pNDw
#include "CaptureDlg.h" SI*O#K=w
#include <windowsx.h> w8kp6_i'
#pragma comment(lib,"hook.lib") GG5wiN*2S
#ifdef _DEBUG pz6fL=Xd
#define new DEBUG_NEW ^|Of
#undef THIS_FILE !TVlsm
static char THIS_FILE[] = __FILE__; O2us+DhQ
#endif %/CCh;N#
#define IDM_SHELL WM_USER+1 U{} bx
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vkOCyi?c
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~M3`mO+^U
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s|dcO
class CAboutDlg : public CDialog A|I7R-
{ {l%Of
public: B4r4PSB>!
CAboutDlg(); 9sFZs]uM
// Dialog Data Z[RE|l{
//{{AFX_DATA(CAboutDlg) p2GkI/6)uu
enum { IDD = IDD_ABOUTBOX }; 6FiI\
//}}AFX_DATA 'mXf8
// ClassWizard generated virtual function overrides (q59cA w~X
//{{AFX_VIRTUAL(CAboutDlg) ZO5_n
protected: uwXquOw
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C,P>7
//}}AFX_VIRTUAL )/1AF^ E
// Implementation oa? bOm
protected: 6.ASLH3#
//{{AFX_MSG(CAboutDlg) @Z&El:]3>
//}}AFX_MSG Jajo!X*Wai
DECLARE_MESSAGE_MAP() zXx H aM
}; ]wMd!.lm-
Fo=Icvo
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) --4,6va`e
{ >k"Z'9l
//{{AFX_DATA_INIT(CAboutDlg) 'X d_8.
//}}AFX_DATA_INIT 'c*Q/C;
} lE=(6Q
oDogM`T`
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rU=qr&f"B
{ (/UW}$] h
CDialog::DoDataExchange(pDX); )y4bb^;z
//{{AFX_DATA_MAP(CAboutDlg) -~\R.<+
//}}AFX_DATA_MAP ~[l6;bn
} umhg
O.!
HQJ_:x
Y
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hOw
//{{AFX_MSG_MAP(CAboutDlg) `U?"
{;j
{
// No message handlers 1O]'iS"
//}}AFX_MSG_MAP _y*@Hj
END_MESSAGE_MAP() M!Q27wT8O
I(tMw6C$:
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v W=$C
: CDialog(CCaptureDlg::IDD, pParent) ?f f !(U
{ NF8'O
//{{AFX_DATA_INIT(CCaptureDlg) M3P\1
m_bControl = FALSE; >-J%=P
m_bAlt = FALSE; _<s[HGA`z
m_bShift = FALSE; 44C"Pl
E
u
m_Path = _T("c:\\"); o?,c#g
m_Number = _T("0 picture captured."); *ggai?
nCount=0; k'6x_
G
bRegistered=FALSE; op8[8pt%
bTray=FALSE; E+Eug{+
//}}AFX_DATA_INIT pNFVa<D
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 t,w'w_C
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); aHR+4m~)
} =|+%^)E
Wf!u?nH.5
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _^ZBSx09)
{ \Gl>$5np
CDialog::DoDataExchange(pDX); ;$.^
//{{AFX_DATA_MAP(CCaptureDlg) jjT)3
c:J[
DDX_Control(pDX, IDC_KEY, m_Key); *lo0T93B
DDX_Check(pDX, IDC_CONTROL, m_bControl); F+<e9[
DDX_Check(pDX, IDC_ALT, m_bAlt); U{,:-R
DDX_Check(pDX, IDC_SHIFT, m_bShift); S1I# qb
DDX_Text(pDX, IDC_PATH, m_Path); 61SbBJ6[
DDX_Text(pDX, IDC_NUMBER, m_Number); V=d~}PJ>
//}}AFX_DATA_MAP <D`VFSEJ
} SX)o0v+
mI>=S
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2}uSrA7n]
//{{AFX_MSG_MAP(CCaptureDlg) BAIR!
ON_WM_SYSCOMMAND() [gaB}aLn
ON_WM_PAINT() w~AW(
VX
ON_WM_QUERYDRAGICON() P.
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ON_BN_CLICKED(ID_ABOUT, OnAbout) bHRRgR`,
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 230ijq3YG
ON_BN_CLICKED(ID_CHANGE, OnChange) `E2RW{$A
//}}AFX_MSG_MAP U[O7}Nsb"
END_MESSAGE_MAP() 45 B
|U
jdf3XTw
BOOL CCaptureDlg::OnInitDialog() \o}=ob
{ 4+B&/}FDLo
CDialog::OnInitDialog(); ]KM3G
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "?=$(7uc
ASSERT(IDM_ABOUTBOX < 0xF000); >&[q`i{
CMenu* pSysMenu = GetSystemMenu(FALSE); !g[UFw
if (pSysMenu != NULL) =3;~7bYO
{ m)ENj6A>yP
CString strAboutMenu; VQ7A"&hh
strAboutMenu.LoadString(IDS_ABOUTBOX); dZkj|Ua~
if (!strAboutMenu.IsEmpty()) Z,I0<ecaD
{ g[L}puN
pSysMenu->AppendMenu(MF_SEPARATOR); zP8rW5/
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); EkpM'j=
} p~yGp]yJ9
} /_mU%fl
SetIcon(m_hIcon, TRUE); // Set big icon GK&R,q5}
SetIcon(m_hIcon, FALSE); // Set small icon 3S"kw
m_Key.SetCurSel(0); !BDJU
RegisterHotkey(); Ksf f]##H
CMenu* pMenu=GetSystemMenu(FALSE); 4Z0Y8y8)
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]sDlZJX<M
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?wVq5^ e
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m](q,65 2
return TRUE; // return TRUE unless you set the focus to a control c7@[RG !
} ZC97Z sE
KkZS 6rD\
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :Izdj*HL;A
{ &?*H`5#?G
if ((nID & 0xFFF0) == IDM_ABOUTBOX) M7.H;.?
{ ?t [C?{'
CAboutDlg dlgAbout; 9'0v]ar
dlgAbout.DoModal(); ;Dp<|n
} h3Y|0-D
else ;<H\{w@D
{ ]6].l$%z#
CDialog::OnSysCommand(nID, lParam); ^Is#_Z|
} $O9,Gvnxx
} rLE5fl5W
C zxF
void CCaptureDlg::OnPaint() }CQ)W1mO"
{ /TScYE:$HE
if (IsIconic()) evlz R/
{ ?sclOOh
CPaintDC dc(this); // device context for painting CD pLV:
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); aA=7x&z@
// Center icon in client rectangle 6]fz;\DgP
int cxIcon = GetSystemMetrics(SM_CXICON); g_e_L39
int cyIcon = GetSystemMetrics(SM_CYICON); -J^t#R^$`
CRect rect; \*\ )zj*r
GetClientRect(&rect); u&r+ylbsI
int x = (rect.Width() - cxIcon + 1) / 2; "f4atuuXa
int y = (rect.Height() - cyIcon + 1) / 2; '5}@#Mi
// Draw the icon .Lp\Jyegs
dc.DrawIcon(x, y, m_hIcon); ]L_h3Xz\X
} %YwIR.o
else 7i88iT
{ 9Bi{X_.9
CDialog::OnPaint(); i|CAN,'
} iJ p E`
} l [
Na vw
V?N8 ,)j
HCURSOR CCaptureDlg::OnQueryDragIcon() }\]J?I+ A
{ A;gU@8m
return (HCURSOR) m_hIcon; G'(8/os{
} f~{4hVA
(}MN16!
void CCaptureDlg::OnCancel() %Mr^~7nN
{ N.?)s.D(
if(bTray) Kq;s${ |G
DeleteIcon(); Y(6 p&I
CDialog::OnCancel(); b>f{o_
} `-[|@QNFz
D}]u9jS1
void CCaptureDlg::OnAbout() e<r}{=1w
{ hYSf;cG}A
CAboutDlg dlg; d< b ,].
dlg.DoModal(); YOQ>A*@4
} Q=#N4[W'
IRIYj(J
void CCaptureDlg::OnBrowse() ;ji["b
{ % jSB9
CString str; eKW^\
BROWSEINFO bi; Z^O_7I<5E
char name[MAX_PATH]; y-lBaTE9
ZeroMemory(&bi,sizeof(BROWSEINFO)); YK )e
bi.hwndOwner=GetSafeHwnd(); \&b1%Asyz
bi.pszDisplayName=name; tWaM+W
bi.lpszTitle="Select folder"; pd}Cg'}X
bi.ulFlags=BIF_RETURNONLYFSDIRS; /<Yz;\:Jy
LPITEMIDLIST idl=SHBrowseForFolder(&bi); u_jhmKr~
if(idl==NULL) [(m+Ejzi%
return; -d_7 q
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '|@?R |i0
str.ReleaseBuffer(); 4^_'LiX3[
m_Path=str; %JPBD]&M
if(str.GetAt(str.GetLength()-1)!='\\') ' ?uwUBi
m_Path+="\\"; qaiR329fx
UpdateData(FALSE); E~`l/ W
} <3!Q Xc
0$=w8tP)
void CCaptureDlg::SaveBmp() &*#Obv
{ kV:T2}]|H
CDC dc; $d5}OI"g
dc.CreateDC("DISPLAY",NULL,NULL,NULL); #D-Ttla
CBitmap bm; 'g:.&4x_w
int Width=GetSystemMetrics(SM_CXSCREEN); ):7mK03J
int Height=GetSystemMetrics(SM_CYSCREEN); U5ME`lN*`
bm.CreateCompatibleBitmap(&dc,Width,Height); C9^C4
CDC tdc; $LW8 vo7
tdc.CreateCompatibleDC(&dc); `Jn2(+
CBitmap*pOld=tdc.SelectObject(&bm); RX?y}BDo0
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); sw+vyBV)r
tdc.SelectObject(pOld); :%>TM/E N
BITMAP btm; &vN^*:Q
bm.GetBitmap(&btm); M`p[ Zq
DWORD size=btm.bmWidthBytes*btm.bmHeight; "P a y2
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); r<5i
BITMAPINFOHEADER bih; JKA%$l0
bih.biBitCount=btm.bmBitsPixel; Y(F>;/AA
bih.biClrImportant=0;
" 2Q*-
bih.biClrUsed=0; *K;s*-|U
bih.biCompression=0; +g&M@8XO&
bih.biHeight=btm.bmHeight; zKfY0A R
bih.biPlanes=1; g17 fge6%
bih.biSize=sizeof(BITMAPINFOHEADER); }U@(S>,%
bih.biSizeImage=size; )6{,y{5!
bih.biWidth=btm.bmWidth; o^W.53yX
bih.biXPelsPerMeter=0; cC]lO
bih.biYPelsPerMeter=0; &] O^d4/
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); $S/EIN c
static int filecount=0; /YHnt-}v,
CString name; rmeGk&*R8
name.Format("pict%04d.bmp",filecount++); Y'yGhpT~
name=m_Path+name; 6 -BC/
BITMAPFILEHEADER bfh; e \.
bfh.bfReserved1=bfh.bfReserved2=0; a xz-H`oq4
bfh.bfType=((WORD)('M'<< 8)|'B'); NIG*
}[}P
bfh.bfSize=54+size; |?t}7V#[
bfh.bfOffBits=54; !+(H(,gI
CFile bf; H`
h]y
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ BBa!le9P
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IHv>V9yiG
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >[S\NAE>
bf.WriteHuge(lpData,size); X'p%K/-m
bf.Close(); [I,s: mn
nCount++; #9t3 <H[
} (Q"~bP{F
GlobalFreePtr(lpData); wQYW5X
if(nCount==1) {Rq5=/b
m_Number.Format("%d picture captured.",nCount); ]v l?J
else '#>(JN5\
m_Number.Format("%d pictures captured.",nCount); ?8YbTn1f)
UpdateData(FALSE); ,6aF~p;wI|
} o\X|\nUk
Va^(cnwa
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {dwlW`{
{ /%TL{k&m$
if(pMsg -> message == WM_KEYDOWN) +|qw>1J(
{ W4=A.2[q
if(pMsg -> wParam == VK_ESCAPE) =m6<H
return TRUE; W8M(@*
T
if(pMsg -> wParam == VK_RETURN) JvYs6u
return TRUE; bT`et*]
} ohi0_mBz
return CDialog::PreTranslateMessage(pMsg); 's$/-AV
} j:U6q,f]
mpD[k9`x#
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0F 6~S
{ %rO)w?
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9JO1O:W
SaveBmp(); j+Q+.39s-~
return FALSE; h]&o)%{4
} 5YLc4z*
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ C)ic;!$Qhb
CMenu pop; dte-2?%~j
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =z\/xzAwX
CMenu*pMenu=pop.GetSubMenu(0); );{76
pMenu->SetDefaultItem(ID_EXITICON); "p[3^<~uQ
CPoint pt; `Dp4Z>|
K
GetCursorPos(&pt); u56F;y
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); WQMoAPfqL
if(id==ID_EXITICON) )1f.=QZN^;
DeleteIcon(); *A0*.>@N
else if(id==ID_EXIT) Kxi@"<`S
OnCancel(); $Km~x
return FALSE; PoD/i@
} 68~5Dx
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r`e6B!p
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) omI"xx
AddIcon(); dv?t;D@p!
return res; "8E=*2fcw
} hHgH'
*!yA'z<
void CCaptureDlg::AddIcon() z&z5EtFUTh
{ {Rn*)D9
NOTIFYICONDATA data; H=9{|%iS
data.cbSize=sizeof(NOTIFYICONDATA); /!U(/
CString tip; E5\>mf
,;u
tip.LoadString(IDS_ICONTIP); ={50>WXE
data.hIcon=GetIcon(0); Ss:'HH4
data.hWnd=GetSafeHwnd(); G> sqfYkK
strcpy(data.szTip,tip); seb/rxb
data.uCallbackMessage=IDM_SHELL; +pe\9F
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; r9p ((ir
data.uID=98; &_' evZ8
Shell_NotifyIcon(NIM_ADD,&data); ?gCP"~
ShowWindow(SW_HIDE); B^.:dn
bTray=TRUE; CIz_v.&:
} /as+ TU`A
SPnW8
void CCaptureDlg::DeleteIcon() y2nT)nL
{ eWXR #g!%>
NOTIFYICONDATA data; NKRm#
data.cbSize=sizeof(NOTIFYICONDATA); QN#tj$x
data.hWnd=GetSafeHwnd(); f]2;s#cu
data.uID=98; A(z
m
Shell_NotifyIcon(NIM_DELETE,&data); 7?8+h
ShowWindow(SW_SHOW); KK4rVb:-
SetForegroundWindow(); >^g\s]c[
ShowWindow(SW_SHOWNORMAL); &Y3ZGRT
bTray=FALSE; @ ZN@EOM$+
} PR%n>a#
$p*.[)
void CCaptureDlg::OnChange() _jaB[Q=By
{ 3S
@)Ans
RegisterHotkey(); {uxTgX
} u.}H)wt
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BOOL CCaptureDlg::RegisterHotkey() HT6$|j
{ m@YK8c#$
UpdateData(); {gzVbZ#
UCHAR mask=0; BY@l:y4
UCHAR key=0; Kp19dp}'b
if(m_bControl) FJFO0Hb6
mask|=4; E0.o/3Gw6
if(m_bAlt) 9}+X#ma.Nc
mask|=2; F:A Vik
if(m_bShift) pDcGf7
mask|=1; 77'@U(
key=Key_Table[m_Key.GetCurSel()]; BCX2C
if(bRegistered){ c7nbHJi
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ao\Im(?
bRegistered=FALSE; Sa/]81aG
} lBudC
cMask=mask; H;#C NB<e
cKey=key; T/:6Z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D5Z)"~'
return bRegistered; WwUHHm<v
} >?.jN|
*d31fBCk%
四、小结 fr}.#~{5Y
Hk$do`H-=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。