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:
jl)7Jd
8aMmz!S 一、实现方法
^T< HD ?LAiSg=eq 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:
k
x?m "a% {^jRV@ #pragma data_seg("shareddata")
HB0DG<c- HHOOK hHook =NULL; //钩子句柄
+U^H`\EUr UINT nHookCount =0; //挂接的程序数目
n@PXC8} static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
-TT{4\%s static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
{yCE >F\ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
q L-Ni static int KeyCount =0;
g)**)mz[ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
;JHR~ TV #pragma data_seg()
G)8H9EV t}X+P`Ovq 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。
`D,mZj/b PHh4ZFl]_I 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:
9cJ1J7y F`eo3z BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ZP(T=Q cKey,UCHAR cMask)
=c34MY(#X {
0qSf7"3f BOOL bAdded=FALSE;
VTl\'>(Cl for(int index=0;index<MAX_KEY;index++){
"
Z2D@l if(hCallWnd[index]==0){
JF6=0 hCallWnd[index]=hWnd;
ai$s HotKey[index]=cKey;
sD{d8s[( HotKeyMask[index]=cMask;
>ca w
: bAdded=TRUE;
-E+LA KeyCount++;
ypy break;
>MLPmER }
5STk" }
M=t;t0 return bAdded;
j9g0k<eg }
"x4}FQ //删除热键
gaC[%M BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,\'E<O2T {
8k9q@FSln BOOL bRemoved=FALSE;
&S9O:>=* for(int index=0;index<MAX_KEY;index++){
4sM9~zC5 if(hCallWnd[index]==hWnd){
q!Q*T^-rO if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
DPBWw[ hCallWnd[index]=NULL;
xDO1gnH% HotKey[index]=0;
xWxgv;Ah HotKeyMask[index]=0;
kj]m@mS[ bRemoved=TRUE;
2=`}:&0l KeyCount--;
1`F25DhhY break;
E!
mxa }
PE&$2( }
FC
q&- }
YtFH@M return bRemoved;
Rwe!xY^d8 }
]\6*2E{1m ?O.'_YS xv9G% DLL中的钩子函数如下:
wCw_aXqq }_,={<g LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
HzZ.q2Zz% {
Jie=/:& BOOL bProcessed=FALSE;
3!Ca b/T if(HC_ACTION==nCode)
V1
{'d[E* {
L',7@W if((lParam&0xc0000000)==0xc0000000){// 有键松开
39oI
&D>8 switch(wParam)
/ULO#CN?; {
+O?`uV case VK_MENU:
Gi Max MaskBits&=~ALTBIT;
JXqwy^f break;
o)sX?IiC case VK_CONTROL:
>d<tcaB MaskBits&=~CTRLBIT;
dhmrh5Uf break;
nV>=n,+s" case VK_SHIFT:
3fq'<5 ^ MaskBits&=~SHIFTBIT;
s&D>'J break;
6T-iBJT default: //judge the key and send message
JTdcLmL break;
,'a[1RN }
Z/+H for(int index=0;index<MAX_KEY;index++){
;s!GpO7 + if(hCallWnd[index]==NULL)
\$Aw[
5&t continue;
Q|tzA10E
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@i>o+>V {
TykY> cl
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
oG'
'my#3 bProcessed=TRUE;
8c' 5P }
&O|qx~( }
+{[E Ow }
z2god 1" else if((lParam&0xc000ffff)==1){ //有键按下
=:(<lKf,<F switch(wParam)
gbu@& {
n*y@3. case VK_MENU:
#p/'5lA&j MaskBits|=ALTBIT;
x_OZdI break;
"fWm{; case VK_CONTROL:
ldNWdz MaskBits|=CTRLBIT;
'aJm4W&j break;
XE?,)8 case VK_SHIFT:
*(j-jbA MaskBits|=SHIFTBIT;
h45RwQ5Z break;
b_GAK default: //judge the key and send message
Z8q*XpUH break;
Lo
uYY:Q }
V2BsvR` for(int index=0;index<MAX_KEY;index++){
e<-^ if(hCallWnd[index]==NULL)
}`D-]/T8. continue;
fp'%lbk= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7!('+x(> {
N7}yU~j^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
aKk0kC bProcessed=TRUE;
[A46WF>L }
U?(+ {4l }
<: I]0|[ }
8npjQ;%4> if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
*}Nh7>d( for(int index=0;index<MAX_KEY;index++){
L0>w|LpRc if(hCallWnd[index]==NULL)
q a}=p continue;
zJT,Hv . if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^ Mw=!n[ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
A]AM|2 D //lParam的意义可看MSDN中WM_KEYDOWN部分
p5 )+R/ }
n%I9l] }
;ksxz }
&ZAc3@l[c return CallNextHookEx( hHook, nCode, wParam, lParam );
d{~Qd|<rr }
*[0)]|r u,),kj< 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:
xD4G(]d! (*dJ
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
) kK" 1\m BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{pM3f n^$HC=}S 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
>TddKR@C 0/0rWqg
/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
qwDoYyyu {
A3mS Sc6 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
4&'_~ qU {
[Se0+\,& //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Z=CY6Zu7 SaveBmp();
u(P;) E"1 return FALSE;
d&5GkD.P }
<_#a%+5d …… //其它处理及默认处理
[! YSW' }
O^r,H,3S <xh";seL /-Y.A<ieN8 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。
P( 1Z 2}6StmE } 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。
MNocXK N*'d]P2P`J 二、编程步骤
"bA8NQIP )KKmV6>b 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";
B qcFbY z K6'wL!!I 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
u5A$VRMN &6^QFqqW`- 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
aH*5(E] HG&rE3@ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
dPmNX-'7 :y^%I xs{1 5、 添加代码,编译运行程序。
}5=tUfh)]' 9Bi{X_.9 三、程序代码
p* tAwl ^ ^k]2oG ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
L~HL*~#d
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
5^C.}/#>F #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
6.k>J{GG #if _MSC_VER > 1000
wg=-&- #pragma once
c3C<P #endif // _MSC_VER > 1000
:NXM.@jJ=" #ifndef __AFXWIN_H__
LIfYpn6 #error include 'stdafx.h' before including this file for PCH
\kG;T=H #endif
l g*eSx>M #include "resource.h" // main symbols
!@9G9<NK class CHookApp : public CWinApp
a$]i8AeG {
@"L*! public:
-}9># <v CHookApp();
DGO\&^GT^ // Overrides
qORRpWyx& // ClassWizard generated virtual function overrides
D}]u9jS1 //{{AFX_VIRTUAL(CHookApp)
aLO'.5
~^ public:
$kd9^lj#[ virtual BOOL InitInstance();
eY8rm virtual int ExitInstance();
tl^![Z //}}AFX_VIRTUAL
.a7!*I#g //{{AFX_MSG(CHookApp)
!+T29QYK8 // NOTE - the ClassWizard will add and remove member functions here.
#SqU>R // DO NOT EDIT what you see in these blocks of generated code !
i2 G.<(3O //}}AFX_MSG
`R,g_{Mj DECLARE_MESSAGE_MAP()
;lc/FV[/ };
KLCd`vr.xf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
c&I"&oZ@& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
% jSB9 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Mh8s @g BOOL InitHotkey();
rVv4R/3+ BOOL UnInit();
wOF";0EN #endif
lC'U3Q& `w EAU7m: //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
i2X%xYv ^ #include "stdafx.h"
kR65{h"gZT #include "hook.h"
GDY=^r #include <windowsx.h>
J3c8WS{: #ifdef _DEBUG
N^%7 #define new DEBUG_NEW
f8S! FGiNc #undef THIS_FILE
][ 1
iKT static char THIS_FILE[] = __FILE__;
z~Is
E8 #endif
+MyXIWmD #define MAX_KEY 100
;3Z6K5z*f #define CTRLBIT 0x04
c|<E~_.w@ #define ALTBIT 0x02
!U4<4<+ #define SHIFTBIT 0x01
qaiR329fx #pragma data_seg("shareddata")
}fh<L CwTi HHOOK hHook =NULL;
+jb<=ERV[ UINT nHookCount =0;
"-R19SpJKh static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
A8T8+M: static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
1Uk Gjw1J static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
IIO-Jr static int KeyCount =0;
S(PU"}vZy static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&NH[b1NMr #pragma data_seg()
F}c}I8Ao HINSTANCE hins;
/Suh&qw>
void VerifyWindow();
GS+Z(,J>= BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
85qD~o?O //{{AFX_MSG_MAP(CHookApp)
_*fOn@Vwo // NOTE - the ClassWizard will add and remove mapping macros here.
Q/`W[Et // DO NOT EDIT what you see in these blocks of generated code!
Hv-f :P O //}}AFX_MSG_MAP
wyB END_MESSAGE_MAP()
3GPGwzX
| #AF.1;(k CHookApp::CHookApp()
d8.A8<wUr {
`Ha<t. v( // TODO: add construction code here,
ne
8rF.D // Place all significant initialization in InitInstance
"P a y2 }
).IK[5Q` dy3fZ(=q^ CHookApp theApp;
dfT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
_~bG[lX ! {
ZKt`>KZ BOOL bProcessed=FALSE;
YK>?;U+| if(HC_ACTION==nCode)
Ynl Zyw! {
zKfY0A R if((lParam&0xc0000000)==0xc0000000){// Key up
#=,c8"O switch(wParam)
#Wq@j1? {
9k;%R5( case VK_MENU:
[r^WS;9n MaskBits&=~ALTBIT;
=F09@C, break;
T
3<2ds case VK_CONTROL:
6"yIk4u: MaskBits&=~CTRLBIT;
v]y=+* A break;
Qv]>L4PO case VK_SHIFT:
),XDY_9K MaskBits&=~SHIFTBIT;
95sK ;`rE+ break;
BMb0Pu8 default: //judge the key and send message
;]>a7o break;
soh9Oedml- }
cnB:bQQK8 for(int index=0;index<MAX_KEY;index++){
`5SQ4 if(hCallWnd[index]==NULL)
K"8! continue;
bMGXx>x if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
=-]NAj\ {
gwDVWhq SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
gP`CQ0t bProcessed=TRUE;
IHv>V9yiG }
7A^L$TY }
Pr3>}4M }
Qn}M else if((lParam&0xc000ffff)==1){ //Key down
P52qt N< switch(wParam)
*BKIA {
|Q$Dj!!1P case VK_MENU:
oj[<{/,C9 MaskBits|=ALTBIT;
lsU`~3nr break;
Z6#(83G4 case VK_CONTROL:
|eqp3@Y1E MaskBits|=CTRLBIT;
KebC$g@W break;
as"@E>a case VK_SHIFT:
J7wIA3.O MaskBits|=SHIFTBIT;
6L3i
break;
T:g%b @ default: //judge the key and send message
a}[rk*QmZ break;
R]0tG
}
6t3Zi:=I for(int index=0;index<MAX_KEY;index++)
))I[@D1b {
aa}U87]k if(hCallWnd[index]==NULL)
1cD continue;
VYkUUp if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
?@ 7Reh\ {
Ks-$([_F SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
's$/-AV bProcessed=TRUE;
{Gw{W&< }
j-wKm_M#jX }
cC9haxW }
^M+aQg% if(!bProcessed){
9JO1O:W for(int index=0;index<MAX_KEY;index++){
|d=GAW
v if(hCallWnd[index]==NULL)
>^D5D%" continue;
Q}#xfrprF if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#lF 2qw SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
6
2t9SY }
Jt3*(+J>/ }
B^C5? }
&t}6sD9o return CallNextHookEx( hHook, nCode, wParam, lParam );
XV1XzG# C }
J:G{ XoGOY|2`6 BOOL InitHotkey()
fvj {
b?:?" if(hHook!=NULL){
Wz;@Rl|F nHookCount++;
nI/kX^Pd return TRUE;
TjOK8
t }
7{38g else
p,14'HS%@ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
DuIgFp if(hHook!=NULL)
)NO,G nHookCount++;
}>_ return (hHook!=NULL);
=.qPjp_Qd }
l=C|4@ BOOL UnInit()
Bnw^W_ {
Lm+E? Ca if(nHookCount>1){
7Ac.^rv5 nHookCount--;
d w'P =8d return TRUE;
I(<Trn }
\vE-;, BOOL unhooked = UnhookWindowsHookEx(hHook);
vd/ BO if(unhooked==TRUE){
gi+FL_8CzU nHookCount=0;
d}wE4(]b hHook=NULL;
S";}gw?r6 }
9H2mA$2jnE return unhooked;
t-SZBNb }
VUD9ZyPw Nx!7sE*b$1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-i]2b {
MRzY<MD BOOL bAdded=FALSE;
Gz2\&rmN for(int index=0;index<MAX_KEY;index++){
5kCXy$"% if(hCallWnd[index]==0){
P`y.3aK hCallWnd[index]=hWnd;
>RrG&Wv59 HotKey[index]=cKey;
\"d\b><R HotKeyMask[index]=cMask;
O7p=|F" bAdded=TRUE;
Q1!+wC KeyCount++;
'tt4"z2 break;
|#Q0UM|'Q }
e@PY(#ru }
rj/nn)vv; return bAdded;
@B!gxW\C }
/xd|mo)D 4}0Ry\
6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
c=re( {
;8b!T
-K BOOL bRemoved=FALSE;
fIn^a3TV for(int index=0;index<MAX_KEY;index++){
M2nUY`%#v if(hCallWnd[index]==hWnd){
<slrzc_>& if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
gI/(hp3ob hCallWnd[index]=NULL;
f67t.6Vw2+ HotKey[index]=0;
>|mZu)HIY; HotKeyMask[index]=0;
[4+I1UR` bRemoved=TRUE;
~DS.b-E KeyCount--;
<:!:7 break;
.&n!4F' }
<VhD>4f{] }
%0'7J@W }
(UZ].+)s return bRemoved;
#Fkp6`Q$x }
\/-4 jF: - *qoF(/U void VerifyWindow()
PoLk{{l3 {
:mt<]Oy3 for(int i=0;i<MAX_KEY;i++){
pDcGf7 if(hCallWnd
!=NULL){ u[nLrEnD
if(!IsWindow(hCallWnd)){ ~VV $wU!A
hCallWnd=NULL; orAr3`AR3
HotKey=0; BN6cu9a
HotKeyMask=0; 24\^{3nOK
KeyCount--; :Xu9`5
} Q'YakEv >=
} YUTI)&y
} %q6I-
}
Az/B/BLB
?U
=Mdw
BOOL CHookApp::InitInstance() eV"Uv3
{ ]1MZ:]k
AFX_MANAGE_STATE(AfxGetStaticModuleState()); gL`aLg_
hins=AfxGetInstanceHandle(); #VxN [770
InitHotkey(); _>_"cKS
return CWinApp::InitInstance(); b"Jr_24t3v
} U|8?$/*\
)5u#'5I>
int CHookApp::ExitInstance() 0n\AUgVPF
{ h<qi[d4X
VerifyWindow(); [MD"JW?4B
UnInit(); c= aZ[
return CWinApp::ExitInstance(); <YrsS-9
} %CqG/ol
7cO1(yE#vr
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3,J{!
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =&~ K;=:
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8Nx fYA
#if _MSC_VER > 1000 @~FJlG(n
#pragma once .pH 4[~
#endif // _MSC_VER > 1000 X.ZG-TC
)k]{FM
class CCaptureDlg : public CDialog C8=r sh
{ /JIVp_-p
// Construction 7^1K4%IPl
public: + -rSO"nc
BOOL bTray; zoBp02j
BOOL bRegistered; n^nQrRIp
BOOL RegisterHotkey(); {MUO25s02
UCHAR cKey; UG]x CkDS
UCHAR cMask; TCi0]Y~a
void DeleteIcon(); %&J`mq
void AddIcon(); u++a0>N
UINT nCount; 5i'KGL
void SaveBmp(); <3Rq!w/
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3@* ~>H
// Dialog Data v!=e]w6{
//{{AFX_DATA(CCaptureDlg) 6U,:J'5gP
enum { IDD = IDD_CAPTURE_DIALOG }; ;CuL1N#I
CComboBox m_Key; M&e=LV
BOOL m_bControl;
"#pN
BOOL m_bAlt; CY"i|s
BOOL m_bShift; !e~d,NIy
CString m_Path; cW?6Iao
CString m_Number; ;KG}Yr72
//}}AFX_DATA n.,ZgLx["
// ClassWizard generated virtual function overrides Kr`.q:0GK
//{{AFX_VIRTUAL(CCaptureDlg) Xd.y or
public: B5_QH8kt7
virtual BOOL PreTranslateMessage(MSG* pMsg); Mb97S]878I
protected: 2\gbciJ[{(
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Djf~8q V!
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); h}}7_I9
//}}AFX_VIRTUAL QwuSo{G
// Implementation 3Qp6$m
protected: i,L"%q)C
HICON m_hIcon; "AIS6%,
// Generated message map functions [TT:^F(Y
//{{AFX_MSG(CCaptureDlg) v'Up& /(
virtual BOOL OnInitDialog(); y }h2
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5UQ[vHMqI
afx_msg void OnPaint(); u%Z4 8wr
afx_msg HCURSOR OnQueryDragIcon(); W7 +Q&4Y
virtual void OnCancel(); p4K
8L'nZ
afx_msg void OnAbout(); _HAr0R8BY
afx_msg void OnBrowse(); $<f+CtD4
afx_msg void OnChange(); }~#qDrK
//}}AFX_MSG NNRKYdp,
DECLARE_MESSAGE_MAP() f&XM|Bg
}; P[e#j
#endif ^!O2Fw
5jTA6s9z A
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file *C> N
#include "stdafx.h" 1z3I^gI*i
#include "Capture.h" By<~h/uJ
#include "CaptureDlg.h" l_2YPon
#include <windowsx.h> be.Kx< I
#pragma comment(lib,"hook.lib") y|WOw(#
#ifdef _DEBUG ?_/T$b]
#define new DEBUG_NEW B_%O6
#undef THIS_FILE ET3+07
static char THIS_FILE[] = __FILE__; 92*Y( >
#endif ML
X: S?
#define IDM_SHELL WM_USER+1 @2 SL$0!QA
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C}]rx{xC
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G""=`@
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,E4qxZC(X
class CAboutDlg : public CDialog 3[To"You
{ l3kBt-m
public: H3S u'3
CAboutDlg(); uTP4r
// Dialog Data 7JP.c@s
//{{AFX_DATA(CAboutDlg) dJZ
9mP!d
enum { IDD = IDD_ABOUTBOX }; Rs 0Gqx
//}}AFX_DATA YZp]vlm~
// ClassWizard generated virtual function overrides nZUBblRJ)
//{{AFX_VIRTUAL(CAboutDlg) k12mxR/
protected: ;p)fW/<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _NM=9cWd
//}}AFX_VIRTUAL QBT_H"[
// Implementation GSg/I.)S
protected: ]F,v#6qi
//{{AFX_MSG(CAboutDlg) o=doL{#
//}}AFX_MSG [2ZZPY9?Q
DECLARE_MESSAGE_MAP() )TgjaR9G
}; wmgKh)`@_{
,vUMy&AV
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &k {1N.
{ "8`f x
//{{AFX_DATA_INIT(CAboutDlg) w1|YR
//}}AFX_DATA_INIT _{'HY+M
} "@E(}z'sM
\9dC z;
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Nv_"?er+y
{ \~ h7
CDialog::DoDataExchange(pDX); qn R{'d
//{{AFX_DATA_MAP(CAboutDlg) D'+kzb@
//}}AFX_DATA_MAP Ot_xeg;7
} nA^UF_rD-
rF5O?<(
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4]]1JL(Ka
//{{AFX_MSG_MAP(CAboutDlg) slMWk;fmD}
// No message handlers p,+$7f1S
//}}AFX_MSG_MAP ^++ec>
END_MESSAGE_MAP() u!&Vbo? .B
NbnuQPb'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -kd_gbnr3
: CDialog(CCaptureDlg::IDD, pParent) ~;0J4hR
{ u9"1%
//{{AFX_DATA_INIT(CCaptureDlg) \[w82%U
m_bControl = FALSE; q@x{6zj
m_bAlt = FALSE; rTjV/~
m_bShift = FALSE; _S;L|1>S
m_Path = _T("c:\\"); <w d+cPZQr
m_Number = _T("0 picture captured."); YS5 Pt)?
nCount=0; QeVM9br)m
bRegistered=FALSE; Vee`q.
bTray=FALSE; [/ E_v gZ
//}}AFX_DATA_INIT tA2I_WCl
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 wZm=h8d
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3g]Sp/
} ?qt>;o|Ue
@^$Xy<x
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) K?q1I<94
{ NQ@."8
CDialog::DoDataExchange(pDX); YRYAQj/7
//{{AFX_DATA_MAP(CCaptureDlg) %Ln7{w
DDX_Control(pDX, IDC_KEY, m_Key); 9ci=]C5o3K
DDX_Check(pDX, IDC_CONTROL, m_bControl); q|.
X[~e|
DDX_Check(pDX, IDC_ALT, m_bAlt); l1\/ `
DDX_Check(pDX, IDC_SHIFT, m_bShift); {g *kr1JM
DDX_Text(pDX, IDC_PATH, m_Path); F$FCfP7
DDX_Text(pDX, IDC_NUMBER, m_Number); (!U5B
Hnd
//}}AFX_DATA_MAP ;w,g|=RQ
} 0'm4
)\
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) nJ`JF5tI
//{{AFX_MSG_MAP(CCaptureDlg) Xo(W\Pes
ON_WM_SYSCOMMAND() `ba<eT':
ON_WM_PAINT() wp8-(E^
ON_WM_QUERYDRAGICON() t:lDFv4s
ON_BN_CLICKED(ID_ABOUT, OnAbout) 0Z((cI\J
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .AX%6+o
ON_BN_CLICKED(ID_CHANGE, OnChange) _{^F8
//}}AFX_MSG_MAP D5@}L$u
END_MESSAGE_MAP() c uAp,!
OmK0-fa/
BOOL CCaptureDlg::OnInitDialog() b;;y|H
{ _u_|U
CDialog::OnInitDialog(); xPT$d,~"
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *2pE39
ASSERT(IDM_ABOUTBOX < 0xF000); z-0
N/?x1
CMenu* pSysMenu = GetSystemMenu(FALSE); j _E(h.
if (pSysMenu != NULL) gQ '=mU
{ |%X_<Cpk
CString strAboutMenu; Lrx"Hn{
strAboutMenu.LoadString(IDS_ABOUTBOX); OB(~zUe.R
if (!strAboutMenu.IsEmpty()) ByWad@-6i
{ YE"MtL {
pSysMenu->AppendMenu(MF_SEPARATOR); @ohJ'
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6xh-m
} 9<!??'@f
} :/Y4I)'
SetIcon(m_hIcon, TRUE); // Set big icon MS|1Q@S9
SetIcon(m_hIcon, FALSE); // Set small icon 2j>C4Ck
m_Key.SetCurSel(0); .$G^c
RegisterHotkey(); kmfz.:j{
CMenu* pMenu=GetSystemMenu(FALSE); hA~5,K0b
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); {;UBW7{
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =o"sBVj
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mp]UUpt
return TRUE; // return TRUE unless you set the focus to a control gd31d s!G
} ,qgR+]?({
[S`Fm>,
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uTrGb:^
{ &19z|Id
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "Jyb?5
{ Me,AE^pgL'
CAboutDlg dlgAbout; $/JnYkL{m
dlgAbout.DoModal(); vs.}Bou]
} 9EZh~tdV[
else DGAg#jh
{ ~Oj-W6-+&,
CDialog::OnSysCommand(nID, lParam); }W]k1Bsx
} 3o__tU)B
} 2-wvL&pi)
w\.z-6G
void CCaptureDlg::OnPaint() b WZX
{ vi.q]$ohbV
if (IsIconic()) oxqD/fY
{ kObgoMT<[
CPaintDC dc(this); // device context for painting iuq%Q\0@w
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); fm%-wUgj
// Center icon in client rectangle h|=&a0
int cxIcon = GetSystemMetrics(SM_CXICON); 3PZwz^oRh9
int cyIcon = GetSystemMetrics(SM_CYICON); 9=^4p=1J
CRect rect; N`rOlEk
GetClientRect(&rect); Rh#TR"
int x = (rect.Width() - cxIcon + 1) / 2; &5wM`
int y = (rect.Height() - cyIcon + 1) / 2; ~dqEUu!C
// Draw the icon _9zydtw
dc.DrawIcon(x, y, m_hIcon); $y*["~TJ
} TBqJ.a
else QI2T G,
{ vV9q5Bj:
CDialog::OnPaint(); u>-!5=D8
} q^w3n2
} [I` 6F6
;yH1vX
HCURSOR CCaptureDlg::OnQueryDragIcon() Me*]Bh
{ sh"\ kk9
return (HCURSOR) m_hIcon; @=[SsS
} "&/&v
_7zER6#}
void CCaptureDlg::OnCancel() K:eP Il{JE
{ G?6[K&w
if(bTray) xcYYo'U
DeleteIcon(); 0zAj.iG
CDialog::OnCancel(); sf5koe
} .sDVBT'%
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void CCaptureDlg::OnAbout() Z*|qbu)
{ ^CwzAB
CAboutDlg dlg; n300kpv
dlg.DoModal(); ukSi9| 1-,
} =e,2/Ep{i
*lIK?" mo
void CCaptureDlg::OnBrowse() `?VB)
{ %G$Kahx V>
CString str; _6
~/`_(KP
BROWSEINFO bi; DP NUm<>
char name[MAX_PATH]; &6E^<v?]
ZeroMemory(&bi,sizeof(BROWSEINFO)); %o+VZEH3
bi.hwndOwner=GetSafeHwnd(); d\V\,%&.
bi.pszDisplayName=name; k]"Rg2>%
bi.lpszTitle="Select folder"; V<@]Iv
bi.ulFlags=BIF_RETURNONLYFSDIRS; fD<3Tl8U0
LPITEMIDLIST idl=SHBrowseForFolder(&bi); yl%F}kBR
if(idl==NULL) KutR l$,
return; Ss&R!w9p
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); SA|f1R2uS
str.ReleaseBuffer(); 65Ysg}x
m_Path=str; , c/\'k\K)
if(str.GetAt(str.GetLength()-1)!='\\') y@G5I>v
m_Path+="\\"; ge[+/$(1
UpdateData(FALSE); XH0R:+s
} Tp`by
1s
F[c;iM(^
void CCaptureDlg::SaveBmp() M#d_kDMw
{ x1$tS#lS
CDC dc; =1%3".
"n@
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y2w 9]:J
CBitmap bm; (CH F=g
int Width=GetSystemMetrics(SM_CXSCREEN); %u43Pj
int Height=GetSystemMetrics(SM_CYSCREEN); 59p'Ega.
bm.CreateCompatibleBitmap(&dc,Width,Height); fdN-Zq@'
CDC tdc; oG5JJpLT
tdc.CreateCompatibleDC(&dc); ){")RrD(
CBitmap*pOld=tdc.SelectObject(&bm); fdzD6KZI
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); e4ajT
tdc.SelectObject(pOld); {JzX`Z30l
BITMAP btm; ?jBna
~
bm.GetBitmap(&btm); `yHV10
DWORD size=btm.bmWidthBytes*btm.bmHeight;
7+j@0v\
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }
CJQC
BITMAPINFOHEADER bih; s%J|r{F6
bih.biBitCount=btm.bmBitsPixel; nKh._bvfX
bih.biClrImportant=0; z8= Gc$w!
bih.biClrUsed=0; NwuME/C7#
bih.biCompression=0; r+>E`GGQ
bih.biHeight=btm.bmHeight; Lqbu]
bih.biPlanes=1; E'&UWDh
bih.biSize=sizeof(BITMAPINFOHEADER); j46fQ
bih.biSizeImage=size; }O@S;[v
S
bih.biWidth=btm.bmWidth; M:nXn7)+
bih.biXPelsPerMeter=0; 6U7z8NV&[
bih.biYPelsPerMeter=0; +vLuzM-
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); mhp5}
static int filecount=0; $[[6N0}*:
CString name; P~i^V;g
name.Format("pict%04d.bmp",filecount++); VE6T&fz`
name=m_Path+name; fh
)QX
BITMAPFILEHEADER bfh; Yq#I#
2RD
bfh.bfReserved1=bfh.bfReserved2=0; C_PXh>H]'
bfh.bfType=((WORD)('M'<< 8)|'B'); <h
U ZD;
bfh.bfSize=54+size; I1&Z@[
bfh.bfOffBits=54; &m4
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CFile bf; r['T.yo
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ i,S%:0c7)
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); iX.=8~3
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pt(GpbtWK
bf.WriteHuge(lpData,size); >;HbDp
bf.Close(); #'^p-Jdm
nCount++; l?a(=
} L1Fn;nR
GlobalFreePtr(lpData); nPfVZGt
if(nCount==1) x7l)i!/$
m_Number.Format("%d picture captured.",nCount); _w^p~To^
else BYVp~!u
m_Number.Format("%d pictures captured.",nCount); aAwnkQ$
UpdateData(FALSE); 3oxQ[.o
} E`iT>+LG<
U-3KuR+0
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }&rf'E9
{ !o:RIwS3
if(pMsg -> message == WM_KEYDOWN) A]BG*
{ )+oDa{dZ
if(pMsg -> wParam == VK_ESCAPE) w^p
'D{{
return TRUE; cpFw]w%]
if(pMsg -> wParam == VK_RETURN) 27t:-O
return TRUE; RX=C)q2c
} ]J;^< 4l
return CDialog::PreTranslateMessage(pMsg); X LA
} 6peO9]Zy
sTeL4g|%{
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E} Uy-
{ !z(POK
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6g@j,iFy
SaveBmp(); =o{zw+|% %
return FALSE; n|SsV
} d|j3E
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &UbNp8h
CMenu pop; 3,oFT
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _
97F
CMenu*pMenu=pop.GetSubMenu(0); S<88>|&n]
pMenu->SetDefaultItem(ID_EXITICON); lb{*,S
CPoint pt; !ygh`]6V
GetCursorPos(&pt); JT[|l-\zo
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 46Nl];g1`
if(id==ID_EXITICON) V_Wv(G0-\
DeleteIcon(); T1M4@j
else if(id==ID_EXIT) D7[ 8*^
OnCancel(); Ga.a"\F.V
return FALSE; EtcAU}9
} 8!b#ez
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r<UZ\d -
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,D+pGxbr
AddIcon(); EXS
1.3>
return res; :f 1*-y
} FGzB7w#
dL |D
void CCaptureDlg::AddIcon() h.sH:]Z
{ DFVaZN?~
NOTIFYICONDATA data; ,Tvk&<!0
data.cbSize=sizeof(NOTIFYICONDATA); ,kpkXK
CString tip; }/SbmW8(1
tip.LoadString(IDS_ICONTIP); dE.R$SM
data.hIcon=GetIcon(0); XcR2]\
data.hWnd=GetSafeHwnd(); :nCGqg
strcpy(data.szTip,tip); 2%. A{!
data.uCallbackMessage=IDM_SHELL; x`WP*a7Fk]
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1bYc^(z0
data.uID=98; Xb?P'nD
Shell_NotifyIcon(NIM_ADD,&data); BC Jo/m
ShowWindow(SW_HIDE); -3_-n*k!
bTray=TRUE; Ldf<
} F7Mf>."
8l~]}2LAs
void CCaptureDlg::DeleteIcon() CDK0 $W n
{ -ce N}Cb3
NOTIFYICONDATA data; ]- " )r
data.cbSize=sizeof(NOTIFYICONDATA); =XzrmPu
data.hWnd=GetSafeHwnd(); ]EnB`g(4;
data.uID=98; =$X5O&E3'
Shell_NotifyIcon(NIM_DELETE,&data); <ZSH1~<{6
ShowWindow(SW_SHOW); 58DkVQ 6
SetForegroundWindow(); po4seW!
ShowWindow(SW_SHOWNORMAL); %nSm 32/t3
bTray=FALSE; MT[V1I{LV
} X#EMmB!
-=H*(M
void CCaptureDlg::OnChange() )M<"YI)g
{ Pv17wUB
RegisterHotkey(); s )POtJ<
} 9E'fM
MRR 5j;4GK
BOOL CCaptureDlg::RegisterHotkey() ai)S:2
{ "9'~6b
UpdateData(); 5z~rl}`v
UCHAR mask=0; ] JVs/
UCHAR key=0; x{6KsYEY
if(m_bControl) ;PCnEs
mask|=4; VUpa^R
if(m_bAlt) #k&"Rv;,
mask|=2; |`+kZ-M*
if(m_bShift) B7zyMh
mask|=1; V(I!HT5.W
key=Key_Table[m_Key.GetCurSel()]; )e(Rf!P{
if(bRegistered){ cXU8}>qY7
DeleteHotkey(GetSafeHwnd(),cKey,cMask); N:?UA
bRegistered=FALSE; 7I;xRo|
} ajC'C!"^Ty
cMask=mask; x' >Nz{B,P
cKey=key; VT8PV5z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $&&mGD;?K
return bRegistered; 7|% |w
} 0zQ"5e?qy
KJn@2x6LP
四、小结 8mj Pa^A
hsG~xRA\
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。