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:
[J{M'+a
Hdn%r<+c 一、实现方法
s-Z< >,9ah"K_x 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:
wDv G5 pz hPEp; #pragma data_seg("shareddata")
>, 9R :X( HHOOK hHook =NULL; //钩子句柄
tQ@%3` UINT nHookCount =0; //挂接的程序数目
_oILZ, static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
<TDp8t9bU static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
-5 Q
gJ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
B&M-em= static int KeyCount =0;
Jn#05Z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
oOAn 5t@ #pragma data_seg()
C3]"y7 YAc~,N 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。
dPm_jX G2[?b2)8 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:
t|5T,YFG WXj
iKW( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
\{@n>Mh cKey,UCHAR cMask)
$!ATj`}kb {
?=dp]E{ BOOL bAdded=FALSE;
)&") J}@ for(int index=0;index<MAX_KEY;index++){
blk4@pg if(hCallWnd[index]==0){
:f/T$fa* hCallWnd[index]=hWnd;
D^30R*gV HotKey[index]=cKey;
&Rp/y%9 HotKeyMask[index]=cMask;
dc+U#]tS bAdded=TRUE;
0XWhSrHM KeyCount++;
n$u@v(I break;
wyi%!H }
'|
6ZPv&N }
d$gT,+|vu return bAdded;
MV?#g-5 }
<Crbc$!OeX //删除热键
Ifu[L&U BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~x-v%x6 {
(rE.ft5$9 BOOL bRemoved=FALSE;
I)AbH<G{ for(int index=0;index<MAX_KEY;index++){
2gM/".|{ if(hCallWnd[index]==hWnd){
!LX) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
w2(pgWed hCallWnd[index]=NULL;
^Mm sja5K HotKey[index]=0;
a`*Dq"9pV HotKeyMask[index]=0;
579<[[6~d2 bRemoved=TRUE;
'~\\:37+ KeyCount--;
&*YFK/ ] break;
)7jJ3G* }
xCYK"v6\ }
4c'F.0^ }
sd,KB+) return bRemoved;
WcOnv'l, }
+.2OZ3( Q^{XM 7@NV|Idtd DLL中的钩子函数如下:
uz
/Wbc>y .dO8I/lhV LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
MfU0*nVF~ {
]I[\Io 1 BOOL bProcessed=FALSE;
H2JKQm_ if(HC_ACTION==nCode)
[q!/YL3% {
Gpf9uj% if((lParam&0xc0000000)==0xc0000000){// 有键松开
{~"fq.h!M switch(wParam)
Kk\TW1w3 {
ak"W/"2: case VK_MENU:
U0ZPY )7k MaskBits&=~ALTBIT;
!Pc&Sg break;
Wi+}qO case VK_CONTROL:
fWz=bJ"V MaskBits&=~CTRLBIT;
9-"!v0[' break;
V]5MIiNl case VK_SHIFT:
R
KXhD PA MaskBits&=~SHIFTBIT;
QF4)@ r{2x break;
^iqy|zNtn default: //judge the key and send message
!I jU *c@ break;
M px98xcO }
wM1&_%N for(int index=0;index<MAX_KEY;index++){
5kik+ if(hCallWnd[index]==NULL)
&Sdf0" continue;
[C`LKA$t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
<]f{X<ef {
cw/E?0MWb SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
qO RL
7?{ bProcessed=TRUE;
Ly q[gQjr }
vI20G89E }
~$jRn(2 }
V.-cm51I else if((lParam&0xc000ffff)==1){ //有键按下
:Xs3Vh,V switch(wParam)
=eyPo(B {
mfx-Ja_a case VK_MENU:
5q;c=oRUj MaskBits|=ALTBIT;
z)ndj
1,#) break;
Sfa;;7W@R case VK_CONTROL:
jR2^n`D MaskBits|=CTRLBIT;
odTa2$O break;
HV=P!v6 case VK_SHIFT:
1$)}EL MaskBits|=SHIFTBIT;
>+9:31p
break;
sH.,O9'r default: //judge the key and send message
v|R#[vtFd break;
Ei4Iv#Oi` }
V<ii for(int index=0;index<MAX_KEY;index++){
^6QzaC3 if(hCallWnd[index]==NULL)
`b KJ continue;
KU^|T2s% if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
jx#9
{
yioX^`Fc(~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~5o2jTNy`p bProcessed=TRUE;
F<4>g+Ag }
D]twid~OS }
pnTz.)'46 }
fXSuJ<G if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
u&Yd+'); for(int index=0;index<MAX_KEY;index++){
Z.b?Jzj if(hCallWnd[index]==NULL)
W1JvLU5L*r continue;
@:}l a if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
! NJGW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
TDX~?>P //lParam的意义可看MSDN中WM_KEYDOWN部分
+45.fo }
+y^'\KN }
#x6EZnG }
#wZbG|% return CallNextHookEx( hHook, nCode, wParam, lParam );
0|6Y%a\U }
aZ8f>t1Q Vy6~O|68= 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
^"iJ cs 58: G5 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
K+|0~/0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
OHv4Yy]$B zeD=-3 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:
Dxe]LES\] |$Cfm} LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
1}~ZsrF {
Z>[n~{-,p if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
0|kH0c,T- {
8p#V4liE //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
$ I
J^ SaveBmp();
j8+>E?nm return FALSE;
KMx
'( }
b!qlucAeE …… //其它处理及默认处理
6OR) 97 }
akG|ic-~ n}C0gt-
i (`Q{l 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& y;5 MaLH2?je^n 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。
'Hsd7Dpi} n5y0$S/D 二、编程步骤
'$[a-)4 n72kJ3u. 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";
-EE}HUP) P('bnDU 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
vDyGxU!#\ d .Q<!Au3 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;
U ]7;K>.T *xN?5u% 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;
+F~B"a :kC*<f\ 5、 添加代码,编译运行程序。
NU"L1dK
@ 4n*`%V 三、程序代码
U|b)Bw<P ,ZVhL* " ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
}}l jVUpC% #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
s^k<r;'\ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
.LGA0 #if _MSC_VER > 1000
lQv(5hIm #pragma once
c9djBUAk& #endif // _MSC_VER > 1000
\wR\i^ #ifndef __AFXWIN_H__
*;l[| #error include 'stdafx.h' before including this file for PCH
7=s7dYlu #endif
-"I9` #include "resource.h" // main symbols
vGOO"r(xL class CHookApp : public CWinApp
X<H{ {
DT_%Rz~< public:
?@<Tzk]a. CHookApp();
*J{E1])<a // Overrides
&x$ps // ClassWizard generated virtual function overrides
ZH`(n5 //{{AFX_VIRTUAL(CHookApp)
6Ilj7m* public:
4wWfaL5" virtual BOOL InitInstance();
L\R(//V virtual int ExitInstance();
4>/i,_&K K //}}AFX_VIRTUAL
xZ(d*/6E //{{AFX_MSG(CHookApp)
DPCQqV |7 // NOTE - the ClassWizard will add and remove member functions here.
iba8G]2 // DO NOT EDIT what you see in these blocks of generated code !
z/nW;ow //}}AFX_MSG
rxj# DECLARE_MESSAGE_MAP()
`XM0Mm% };
t^2$ent LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
:(4q\~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0<##8m@F8 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
7X>*B~(R BOOL InitHotkey();
KL*+gq0k BOOL UnInit();
ge1U1o #endif
(hh^? AmQsay#I_ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
P<;Puww/ #include "stdafx.h"
Wz#ZkNO #include "hook.h"
g`~;"%u7cn #include <windowsx.h>
2wa'WEx #ifdef _DEBUG
bP,Ka #define new DEBUG_NEW
>qUD_U3A #undef THIS_FILE
/B|"<`-H static char THIS_FILE[] = __FILE__;
CAmIwAx6; #endif
ff=RKKnN #define MAX_KEY 100
k5*Z@a #define CTRLBIT 0x04
x3F94+<n{ #define ALTBIT 0x02
7%G&=8tq #define SHIFTBIT 0x01
_#uRKy<`N #pragma data_seg("shareddata")
I}m>t}QRI_ HHOOK hHook =NULL;
YN~1.!F UINT nHookCount =0;
uJ8FzS>[V static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
BqM[{Kv static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
=dmxE*C static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
O-box? static int KeyCount =0;
y'n<oSB} static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
r?dkE=B #pragma data_seg()
bR$5G HINSTANCE hins;
16Jjf|]j void VerifyWindow();
FC BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
N34bB>_ //{{AFX_MSG_MAP(CHookApp)
0.c96& // NOTE - the ClassWizard will add and remove mapping macros here.
Sy<io@df // DO NOT EDIT what you see in these blocks of generated code!
rbs&A{i //}}AFX_MSG_MAP
C
=B a|Z END_MESSAGE_MAP()
?j)#\s2 ?A~=.u@[d CHookApp::CHookApp()
Kzy9i/bL {
tK
`A_hC // TODO: add construction code here,
ggpa!R // Place all significant initialization in InitInstance
l@]Fzl }
19RbIG/X b@sq}8YD|z CHookApp theApp;
(`u+(M!^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
.4[M-@4+] {
ylDfr){ BOOL bProcessed=FALSE;
= )4bf"~8 if(HC_ACTION==nCode)
8#9OSupp {
Cv/3-&5S if((lParam&0xc0000000)==0xc0000000){// Key up
Ns#L9T# switch(wParam)
]\]mwvLT {
ymT]ow6C case VK_MENU:
prB:E[1 MaskBits&=~ALTBIT;
A7eYKo
q break;
[?(qhp! case VK_CONTROL:
2wgcVQ
Awa MaskBits&=~CTRLBIT;
1_StgFu u break;
\&U"7gSL case VK_SHIFT:
[4@@b"H MaskBits&=~SHIFTBIT;
8ZJ6~~h break;
Z=<D` default: //judge the key and send message
s?fEorG
break;
+ZV?yR2yn }
wo$ F_!3u for(int index=0;index<MAX_KEY;index++){
2z1r|?l if(hCallWnd[index]==NULL)
Ik@MIxLK continue;
KXUJ*l-5 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ju4wU;Nu {
{UF|-VaG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
RB;2 bProcessed=TRUE;
pW>.3pj }
:5jor Vu }
@V+KL>Qw }
5d}bl{ else if((lParam&0xc000ffff)==1){ //Key down
,4}s 1J# switch(wParam)
p%/lP{ {
2uMSeSx$ case VK_MENU:
:U]Pm:ivTU MaskBits|=ALTBIT;
|HPb$#i break;
E/D@;Ym18 case VK_CONTROL:
3wfJ!z-E8 MaskBits|=CTRLBIT;
U.<a d break;
'C;KNc case VK_SHIFT:
r4iT
9D MaskBits|=SHIFTBIT;
faZc18M^1 break;
?}jjBJ& default: //judge the key and send message
6'e 'UD break;
f9'dZ}B }
q ^Gj
IP for(int index=0;index<MAX_KEY;index++)
>R.!Qze\G {
kq(]7jU$[ if(hCallWnd[index]==NULL)
h*sL' fJ] continue;
qSaCl6[Do if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
E.^u:0:P {
k\ZU%"^J SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
pvRa bProcessed=TRUE;
s&DAO r!i }
dQ#oY|a }
=S\pI }
lg
1r] if(!bProcessed){
8P&z@E{y for(int index=0;index<MAX_KEY;index++){
Qr?(2t# if(hCallWnd[index]==NULL)
0.1?hb|p5T continue;
9Dyy&$s if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
q@Zeu\T,*# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
lH"VLO2l }
1W9uWkk_d }
<u }
D@k#'KU return CallNextHookEx( hHook, nCode, wParam, lParam );
'2{60t_A }
(&/~q:a> C4|79UG>s BOOL InitHotkey()
j"&Oa&SH {
/EL3Tt if(hHook!=NULL){
?Uhjyi nHookCount++;
EclsOBg return TRUE;
>-(,BfZ }
2F ~SH else
AQc9@3T~Bi hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
:r&4/sN}< if(hHook!=NULL)
V<d`.9*} nHookCount++;
X"T)X#:) return (hHook!=NULL);
qf%p#+:B3 }
VZ2CWE)t BOOL UnInit()
"b`3 {
1#2L9Bi if(nHookCount>1){
;|oem\dKv nHookCount--;
,LL=b-Es return TRUE;
xJFxrG'c }
xB}B1H% BOOL unhooked = UnhookWindowsHookEx(hHook);
YH-W{]. if(unhooked==TRUE){
4>]B8ZxH nHookCount=0;
Qaiqx"x3 hHook=NULL;
hr
g'Z5n }
;Udx|1o return unhooked;
al4X} }
kB-<17 m\K1Ex BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`,FhCT5 {
''.\DC~K BOOL bAdded=FALSE;
>a: 6umY for(int index=0;index<MAX_KEY;index++){
z~;@Mo"*f if(hCallWnd[index]==0){
+@\=v}:
F hCallWnd[index]=hWnd;
IY|>'}UU# HotKey[index]=cKey;
t5S!j2E HotKeyMask[index]=cMask;
KU_""T bAdded=TRUE;
tCu9
D KeyCount++;
D]K?ntS[* break;
|1/?>=dDm }
PxJvE*6^H }
.y#>mXm>
return bAdded;
SFRYX,0m }
kX:8sbZ##4
L$ [1+* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
f5.Be% {
Vv>hr+e BOOL bRemoved=FALSE;
zBqNE` for(int index=0;index<MAX_KEY;index++){
t>"|~T$9 if(hCallWnd[index]==hWnd){
.kDJuJ^ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
qnw8#!%I hCallWnd[index]=NULL;
YKa9]Q HotKey[index]=0;
4o( Q+6m HotKeyMask[index]=0;
+qyx3c+ bRemoved=TRUE;
EOf*1/Ih KeyCount--;
qvRs1yr?q break;
tSaD=# v }
1(
]{tF }
H(Ad"1~.# }
l D]?9K29 return bRemoved;
{)-3g~ }
q}J Eesf /qXP\ a void VerifyWindow()
E_K32)J- {
zHvW@A'F for(int i=0;i<MAX_KEY;i++){
.H5^ N\V| if(hCallWnd
!=NULL){ 0Y*Ag,S
if(!IsWindow(hCallWnd)){ v0+$d\mP4<
hCallWnd=NULL; [<#`@Kr
HotKey=0; <rNz&;m}
HotKeyMask=0; OF`:);
KeyCount--; aOW$H:b
} 5K$d4KT
} +kOXa^K
} )'`@rq!
} E}|IU Pm
{uiL91j.
BOOL CHookApp::InitInstance() v79\(BX
{ V"|j Dnn5
AFX_MANAGE_STATE(AfxGetStaticModuleState()); v$R7"
hins=AfxGetInstanceHandle(); x c$jG?83#
InitHotkey(); wmit>69S
return CWinApp::InitInstance(); m?`$NJST
} r7*'s
_Ns_$_
int CHookApp::ExitInstance() 6$p6dmV|
{ M}9PicI?7
VerifyWindow(); Rhh.fV3
UnInit(); =OooTZb:x-
return CWinApp::ExitInstance(); :"Kr-Hm`
} 2;YL+v2
E)(Rhvij
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,}$[;$ye
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wmFS+F4`2
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2sT\+C&H
#if _MSC_VER > 1000 @5TJ]=
#pragma once 2Xp?O+b#"O
#endif // _MSC_VER > 1000 A)D1
#,0
Us8nOr>5
class CCaptureDlg : public CDialog ?) VBkA5j
{ (e[8`C
// Construction 6"jV>CNc@
public: AM4
:xz
BOOL bTray; A)u,Hvn
BOOL bRegistered; p}-B>v
BOOL RegisterHotkey(); Q E*`#r#e
UCHAR cKey; i
M!=/
UCHAR cMask; MH_3nN
void DeleteIcon(); Bfr$&?j#
void AddIcon(); g}*F"k4j
UINT nCount; Z<$y)bf
void SaveBmp(); (hIy31Pf
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]llvG\
// Dialog Data jftf]n&Z(q
//{{AFX_DATA(CCaptureDlg) u/X1v-2
enum { IDD = IDD_CAPTURE_DIALOG }; 0I[3%Q {
CComboBox m_Key; Lz}mz-N
BOOL m_bControl; T3^(I~03
BOOL m_bAlt; CYN|
BOOL m_bShift; ~ ^)4*@i6
CString m_Path; 0uf)6(f
CString m_Number; EB[B0e7}
//}}AFX_DATA lag%}^
// ClassWizard generated virtual function overrides 47
9yG/+\
//{{AFX_VIRTUAL(CCaptureDlg) g2GHsVS
public: c=~FXV!
virtual BOOL PreTranslateMessage(MSG* pMsg); Vw b6QIs
protected: #
,27,#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (T2\
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @#&y
//}}AFX_VIRTUAL mdukl!_x
// Implementation f#zm}+,`
protected: "9yQDS:
HICON m_hIcon; hIMD2
// Generated message map functions M\dZxhQ-l
//{{AFX_MSG(CCaptureDlg) >^
M=/+<c
virtual BOOL OnInitDialog(); y4N=v{EbL
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <>^otb,e$
afx_msg void OnPaint(); lAx^!#~\
afx_msg HCURSOR OnQueryDragIcon(); ?DKwKt
virtual void OnCancel(); ?ZT+4U00U
afx_msg void OnAbout(); ($Ck5`_MK
afx_msg void OnBrowse(); y4~;H{!
afx_msg void OnChange(); wdTjJfr
//}}AFX_MSG Ce_ES.
DECLARE_MESSAGE_MAP() B&c*KaK;~
}; D$G:#z*
#endif \*6Ld%:h$
:sXn*k4v
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file uvj`r5ei
#include "stdafx.h" B]5G"4,
#include "Capture.h" 4Rev7Mc
#include "CaptureDlg.h" h;2n2.Q
#include <windowsx.h> <GRrw
#pragma comment(lib,"hook.lib") MLn \b0
#ifdef _DEBUG :I^I=A%Pe(
#define new DEBUG_NEW B]|"ePj-
#undef THIS_FILE `f+l\'.s
static char THIS_FILE[] = __FILE__; e`Vb.E)
#endif u.L{3gkT
#define IDM_SHELL WM_USER+1 uO;_T/^u
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T_*R^Ukb5
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q3-V_~5^/z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; OMVK\_oXo
class CAboutDlg : public CDialog UFY_.N~
{ 7Q3a0`Iq
public: k874t D
CAboutDlg(); l|p
\8=
// Dialog Data [agp06 $D?
//{{AFX_DATA(CAboutDlg) Q7@.WG5
enum { IDD = IDD_ABOUTBOX }; o$+"{3svw?
//}}AFX_DATA $M 1/74
// ClassWizard generated virtual function overrides T`.RP&2/d
//{{AFX_VIRTUAL(CAboutDlg) or{X{_X7
protected: 2[R{IV8e
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i?1g{JW
//}}AFX_VIRTUAL Pf?y!dK<
// Implementation ^&6'FE
protected: iN+Tig?c
//{{AFX_MSG(CAboutDlg) }hd:avze
//}}AFX_MSG `8rInfV
DECLARE_MESSAGE_MAP() \5s#9
}; KZ;Q7 1
|VRzIA4M\
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *Af:^>mh
{ [exIK
//{{AFX_DATA_INIT(CAboutDlg) jLu`DKB
//}}AFX_DATA_INIT K}p!W"!o
} W4~:3Sk
L+o"<LV]
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `$odxo+
{ b 5X~^L
CDialog::DoDataExchange(pDX); :RE.m d
//{{AFX_DATA_MAP(CAboutDlg) Ysz&/ry
//}}AFX_DATA_MAP DHlCus=ic
} 1hn4YcHb
R<jt$--H
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OPsg3pW!]
//{{AFX_MSG_MAP(CAboutDlg) =Vm"2g,aA
// No message handlers PA(XdT{
//}}AFX_MSG_MAP ZW0gd7Wh
END_MESSAGE_MAP() B5Y
3GWhrx
8V$ :th('
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D-<9kBZs
: CDialog(CCaptureDlg::IDD, pParent) ( d2|r)O
{ &hb:~>
//{{AFX_DATA_INIT(CCaptureDlg) 1JI\e6]I
m_bControl = FALSE; v2uyn
m_bAlt = FALSE; Rg!Fu
m_bShift = FALSE; ]c'12 g]h
m_Path = _T("c:\\"); "\9!9U#!
m_Number = _T("0 picture captured."); d!i#@XZ^
nCount=0; vS{zLXg
bRegistered=FALSE; [j]3='2}G
bTray=FALSE; - s,M+Q(<
//}}AFX_DATA_INIT U 3f a*D
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =6sL}$
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Pgg\(D#X`
} |/R)FT#i
W%xg;uzp
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) MWxv\o
{ N5%zbfKM
CDialog::DoDataExchange(pDX); 9j;L-
//{{AFX_DATA_MAP(CCaptureDlg) ~;*SW[4
DDX_Control(pDX, IDC_KEY, m_Key); SXW8p>1Jw
DDX_Check(pDX, IDC_CONTROL, m_bControl); ,c;u]
DDX_Check(pDX, IDC_ALT, m_bAlt); <[eE5X(
DDX_Check(pDX, IDC_SHIFT, m_bShift); oS/cS)N20
DDX_Text(pDX, IDC_PATH, m_Path); N=QeeAI}}m
DDX_Text(pDX, IDC_NUMBER, m_Number); @rO4BTi>O
//}}AFX_DATA_MAP N BUSr}8|
} _*I@ J/
Gw5j6
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _*SA_.0
//{{AFX_MSG_MAP(CCaptureDlg) ymxYE#q
ON_WM_SYSCOMMAND() [8o!X)
ON_WM_PAINT() t)*MLg<C
ON_WM_QUERYDRAGICON() m6
)s X&
ON_BN_CLICKED(ID_ABOUT, OnAbout) ktILKpHt"
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c3>#.NP_
ON_BN_CLICKED(ID_CHANGE, OnChange) B4 cm_YGE
//}}AFX_MSG_MAP F( w
END_MESSAGE_MAP() Wx<fD()
u&!QP4$"z
BOOL CCaptureDlg::OnInitDialog() 2$MIA?A"Y
{ vIi#M0@N
CDialog::OnInitDialog(); 5ZRO{rf
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H~IN<3ko
ASSERT(IDM_ABOUTBOX < 0xF000); I-QaR
CMenu* pSysMenu = GetSystemMenu(FALSE); .9< i
if (pSysMenu != NULL) &F*L=Ng
{ %6vf~oG
CString strAboutMenu; cnUYhxE+s
strAboutMenu.LoadString(IDS_ABOUTBOX); 8$H_:*A?
if (!strAboutMenu.IsEmpty()) FM)Es&p&
{ YB^[HE\#y
pSysMenu->AppendMenu(MF_SEPARATOR); #Tjv(O[&
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %)Pn<! L
} rl0sN5n
} ){PL6|5x
SetIcon(m_hIcon, TRUE); // Set big icon /WlpRf%
SetIcon(m_hIcon, FALSE); // Set small icon 8e`'Ox_5a
m_Key.SetCurSel(0); 2&f]v`|M|
RegisterHotkey(); GtC bzNY
CMenu* pMenu=GetSystemMenu(FALSE); ]5+db0
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c3X'Sv
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yj6o533o
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0<8pG:BQ
return TRUE; // return TRUE unless you set the focus to a control +$hqwNh@Z@
} 5w\>Whbd
;<JyA3i^V,
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [84f[`!Ui
{ 1@j0kTJ~m
if ((nID & 0xFFF0) == IDM_ABOUTBOX) "QWF&-kAI
{ =,/08Cs
CAboutDlg dlgAbout; D{]t50a.
dlgAbout.DoModal(); ~JJuM
} ~i4h.ZLj
else _k0X)N+li
{ cH&-/|N
CDialog::OnSysCommand(nID, lParam); t4a/\{/#9|
} #+vIq?
} oA^aT:o +
SIBNU3;DL
void CCaptureDlg::OnPaint() `kn 'RZR
{ oJcDs-!
if (IsIconic()) (~R [K,G
{ MT8BP)C
CPaintDC dc(this); // device context for painting x:h0/f
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [Ch)6p
// Center icon in client rectangle [7Yfv
Xp
int cxIcon = GetSystemMetrics(SM_CXICON); *?zyF@K{%
int cyIcon = GetSystemMetrics(SM_CYICON); wF +9Iu
CRect rect; E^:8Jehq
GetClientRect(&rect); 7r`A6 \
!
int x = (rect.Width() - cxIcon + 1) / 2; D;pfogK @
int y = (rect.Height() - cyIcon + 1) / 2; na;U]IK
// Draw the icon /kl41gx
dc.DrawIcon(x, y, m_hIcon); QEe\1>1"&
} `CWI%V
else Ue>;h9^
{ ~nQv
yM!$
CDialog::OnPaint(); t:DZow
} +:hZ,G?>
} {bxTODt@
}klET
HCURSOR CCaptureDlg::OnQueryDragIcon() =l %
{ As$:V<Z
return (HCURSOR) m_hIcon; 0w0\TWz*
} i'GBj,:
q~[@(+zP5
void CCaptureDlg::OnCancel() p)5j~Nl
{ W| z
djb
if(bTray) Zc_%hQf2A
DeleteIcon(); i8F^ N=
CDialog::OnCancel(); kZ&|.q1zki
} Z/#&c
v99gI%TA'
void CCaptureDlg::OnAbout() .?L&k|wX-
{ .eg?FB'7
CAboutDlg dlg; ,_STt)
dlg.DoModal(); tE i-0J
} E?{{z4
-^C't_Q o
void CCaptureDlg::OnBrowse() 6TN!63{Cz
{ OLThi[Yn
CString str; |v,5s=}7
BROWSEINFO bi; O5:?nD
char name[MAX_PATH]; 5pJ)OX
ZeroMemory(&bi,sizeof(BROWSEINFO)); ::k>V\;
bi.hwndOwner=GetSafeHwnd(); ra="4T$va
bi.pszDisplayName=name; WE_jT1^/
bi.lpszTitle="Select folder"; Q9-o$4#R[
bi.ulFlags=BIF_RETURNONLYFSDIRS; 0q|.]:][Eo
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Fap@cW3?8
if(idl==NULL) BoJYP
return; >k:BG{$Kae
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); T7vSp<i/
str.ReleaseBuffer(); YL(7l|^!
m_Path=str; 85>WK+=
if(str.GetAt(str.GetLength()-1)!='\\') 9ANC,+0p
m_Path+="\\"; r-27AJu
UpdateData(FALSE); hxIG0d!o
} F\' ^DtB
mN5`Fct*A>
void CCaptureDlg::SaveBmp() WD wW`
{ 7+I%0U}m
CDC dc; t<_Jx<{2
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ttazY#
CBitmap bm; D}n&`^1X+
int Width=GetSystemMetrics(SM_CXSCREEN); l>l)m-;O
int Height=GetSystemMetrics(SM_CYSCREEN); aNZJs<3;'D
bm.CreateCompatibleBitmap(&dc,Width,Height); 3kAmRU
CDC tdc; yv.Y-c=
tdc.CreateCompatibleDC(&dc); m!{}Y]FZn
CBitmap*pOld=tdc.SelectObject(&bm); I)wjTTM5
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c\X0*GX
tdc.SelectObject(pOld); Jr0D:
BITMAP btm; q+A^JjzT
bm.GetBitmap(&btm); ?vHow$
DWORD size=btm.bmWidthBytes*btm.bmHeight; q4].C|7
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tTWeOAF
BITMAPINFOHEADER bih; ,XD'f
bih.biBitCount=btm.bmBitsPixel; 0((3q'[ <
bih.biClrImportant=0; U}H2!et&,)
bih.biClrUsed=0; kOv2E]
bih.biCompression=0; [;bZQ6JR
bih.biHeight=btm.bmHeight; TTg>g~t`
bih.biPlanes=1; JsNqijVC
bih.biSize=sizeof(BITMAPINFOHEADER); F[q:jY
bih.biSizeImage=size; .C]V==z`[4
bih.biWidth=btm.bmWidth; ^P5+ _P
bih.biXPelsPerMeter=0; jy=dB-&
bih.biYPelsPerMeter=0; ]1A"l!yf
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 'b#`)w@/=
static int filecount=0; 'qGKS:8
CString name; Y2&>;ym!
name.Format("pict%04d.bmp",filecount++); czMu<@c [
name=m_Path+name; bFivHms
BITMAPFILEHEADER bfh; 8.Q;o+NU
bfh.bfReserved1=bfh.bfReserved2=0; f1cQ*#2~
bfh.bfType=((WORD)('M'<< 8)|'B'); %s.hqr,I
bfh.bfSize=54+size; Ql1HaC/5)-
bfh.bfOffBits=54; zzf;3S?
CFile bf; k+X=8()k
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ | aH;@V
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); j@4
yRl ^
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]Y#$!fIx
bf.WriteHuge(lpData,size); Ri$wt.b
bf.Close(); Qo*,2B9R L
nCount++; BMw_F)hTO
} ]+1?T)<!
GlobalFreePtr(lpData); 6S-1Wc4
if(nCount==1) X#l]%IrW!
m_Number.Format("%d picture captured.",nCount); T6s~f$G
else 8no_xFA
m_Number.Format("%d pictures captured.",nCount); F_8nxQ-
UpdateData(FALSE); .C
avb
} n^8LF9r
#;Yn8'a~
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DNsDEU
{ 4"$K66yk@
if(pMsg -> message == WM_KEYDOWN) >KjyxJ7
{ %
K$om|]p
if(pMsg -> wParam == VK_ESCAPE) w7b?ve3-
return TRUE; g8 (zvG;Y
if(pMsg -> wParam == VK_RETURN) |_&Tu#er3
return TRUE; e:9CD-
} k+xj 2)d7
return CDialog::PreTranslateMessage(pMsg); O'5d6m
} "=l<%em
P;%4Imq3
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7aH E:Dnwp
{ liEb(<$a
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ DlB"o.
SaveBmp(); hZ0p /Bdv
return FALSE; 0qXkWGB
} G~Xh4*#J
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L8<Yk`jx
CMenu pop; 3y!yz3E
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;Qpp[V`
CMenu*pMenu=pop.GetSubMenu(0); S~WsGLF s
pMenu->SetDefaultItem(ID_EXITICON); P0m;AqS#R
CPoint pt; ]h0Fv-[A
GetCursorPos(&pt); b6Jv|1w'
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z/bJDSQ
if(id==ID_EXITICON) #(o 'G4T
DeleteIcon(); !!Tk'=t9"3
else if(id==ID_EXIT) )|>LSKTEl
OnCancel(); gi::?ET/.
return FALSE; \>0F{-cR$
} pdnkHR$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xk}(u`:.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Lp\89tB>
AddIcon(); ".&x`C
return res; vkE[Ur>
} 3z Jbb3e
ZN)a}\]
void CCaptureDlg::AddIcon() %G9:M;|'
{ =>ooB/
NOTIFYICONDATA data; vF, !8e'v
data.cbSize=sizeof(NOTIFYICONDATA); ?#@JH
CString tip; D:Zpls.
tip.LoadString(IDS_ICONTIP); TGxspmY6
data.hIcon=GetIcon(0); ^H'zS3S
data.hWnd=GetSafeHwnd(); Ro+/=*ql~
strcpy(data.szTip,tip); ajy.K'B*
data.uCallbackMessage=IDM_SHELL; >SJ#
rZ
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &(!Sy?tNe
data.uID=98; x{u7# s1|/
Shell_NotifyIcon(NIM_ADD,&data); }{*((@GY}
ShowWindow(SW_HIDE); Wx}+Vq<q
bTray=TRUE; *#j+,q!X
} ~8'4/wh+8
K~nk:}3Ui
void CCaptureDlg::DeleteIcon() 7&G[mOx0
{ bK `'zi
NOTIFYICONDATA data; ]a|3"DP5
data.cbSize=sizeof(NOTIFYICONDATA); V}732?Jy
data.hWnd=GetSafeHwnd(); -Z&6PT7
data.uID=98; #84pRU~
Shell_NotifyIcon(NIM_DELETE,&data); D$k40Mz
ShowWindow(SW_SHOW); %
R~9qO
SetForegroundWindow(); jREj]V>
ShowWindow(SW_SHOWNORMAL); ^ri?eKy.-g
bTray=FALSE; )i&9)_ro
}
v#/Uq?us
9WQC\/w
void CCaptureDlg::OnChange() E?|"?R,,,
{ 5#JGNxO
RegisterHotkey(); DKL< "#.7
} L|G!of[8n
kzCD>m
BOOL CCaptureDlg::RegisterHotkey() |Ia3b VW
{ _%Ay\4H^\
UpdateData(); kvh}{@|-
UCHAR mask=0; ^.Y"<oZSS
UCHAR key=0; >LxYP7M
if(m_bControl) }S6Sz&)
mask|=4; 2Mx9Kd'a
r
if(m_bAlt) Z(AI]wk3<
mask|=2; 11}fPWK
if(m_bShift) .?b2Bd!MC
mask|=1; .fxI)
key=Key_Table[m_Key.GetCurSel()]; CQfrAk4mu
if(bRegistered){ -ecP@,
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6L~@jg~0A[
bRegistered=FALSE; \RZFq<6>
} \ief [
cMask=mask; +~J?/
cKey=key; d,au&WZ;_
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (x9d7$2
return bRegistered; $NP5Z0v7
} D/hQ{T
za7h.yK }
四、小结 IWN:GFH(
42LlR
0
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。