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:
-7!&@wuQ
P=1I<Pew 一、实现方法
J9T3nTfL %6--}bY^ 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:
p\{-t84n bqQq=SO #pragma data_seg("shareddata")
[yj).*0 HHOOK hHook =NULL; //钩子句柄
u{z``] UINT nHookCount =0; //挂接的程序数目
` ]Ppau static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
0P>OJYFr' static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Blq8H"3!: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Vb
qto|X@ static int KeyCount =0;
h$N0D ! static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
w-@6|o,S #pragma data_seg()
sE{ pzPq! >R/$1e1Y 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
g,:j/vR M/Pme&% DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
"n:{!1VGw 6oSQQhge BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
c%*($)# cKey,UCHAR cMask)
l^J75$7 {
wv^rS^~ BOOL bAdded=FALSE;
lnGq :- for(int index=0;index<MAX_KEY;index++){
~XeFOMq if(hCallWnd[index]==0){
*Ei|fe$sa hCallWnd[index]=hWnd;
PA w-6; HotKey[index]=cKey;
_7DkS}NJs HotKeyMask[index]=cMask;
CQ;]J=|<_ bAdded=TRUE;
~ d^<_R KeyCount++;
;6
+}z~ break;
.Wi{lt }
20rkKFk* }
/=uMk]h return bAdded;
PCn Q_A-Q }
PM":Vd/ //删除热键
Il.Ed-&62 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lt$zA%`odc {
V#ev-\k}@ BOOL bRemoved=FALSE;
7m#[!%D for(int index=0;index<MAX_KEY;index++){
7j7e61
Ax if(hCallWnd[index]==hWnd){
$(Ugtimdv if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
qNyzU@ hCallWnd[index]=NULL;
/WPv\L HotKey[index]=0;
L}#0I+Ml7 HotKeyMask[index]=0;
0N=X74 bRemoved=TRUE;
u9=SpgB# KeyCount--;
f`>/
H!<2 break;
"!K'A7.^ }
LflFe@2 }
<\zCpkZ'B }
D}3XFuZs_ return bRemoved;
6a}"6d/sTL }
midsnG+jnf TO,rxf `IINq{Zk DLL中的钩子函数如下:
FI8Oz, fQ+VT|jzx LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[~D|peM3 {
Z['\61 BOOL bProcessed=FALSE;
M\b")Tu{0 if(HC_ACTION==nCode)
PN+G:Qv {
z=&z_}M8 if((lParam&0xc0000000)==0xc0000000){// 有键松开
\RQ='/H* switch(wParam)
e$c?}3E!z {
+*oS((0s case VK_MENU:
7nzGAz_W MaskBits&=~ALTBIT;
M9!AIHq4 break;
a:YI"*S
case VK_CONTROL:
_B2V "p MaskBits&=~CTRLBIT;
>*twTlb{ break;
#sKWd case VK_SHIFT:
m"c :"I6 MaskBits&=~SHIFTBIT;
TaJB4zB break;
2S`?hxAL default: //judge the key and send message
1G~S|,8p break;
aKF*FFX }
c':ezEaC for(int index=0;index<MAX_KEY;index++){
C9S@v D+ if(hCallWnd[index]==NULL)
W&:[r/8wA continue;
J` {6l if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[=*E+Oc {
Bqws!RM'&@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
y'ja< 1I> bProcessed=TRUE;
wxLXh6|6%_ }
6`\]derSon }
$3=:E36K }
H]<]^Zmjy else if((lParam&0xc000ffff)==1){ //有键按下
(UNtRz'=; switch(wParam)
gJ2
H=#M {
(kTXP_ case VK_MENU:
64Gi8|P MaskBits|=ALTBIT;
PU9`<3z5 break;
<I;*[;AK case VK_CONTROL:
U3vEdw<lV MaskBits|=CTRLBIT;
T)7TyE|"2g break;
z1 i &Ge case VK_SHIFT:
(B>Zaro# MaskBits|=SHIFTBIT;
>zY \Llv break;
F)$K default: //judge the key and send message
wN37zPnV~ break;
5TBI<K }
WKA'=,`v for(int index=0;index<MAX_KEY;index++){
D 7shiv|, if(hCallWnd[index]==NULL)
6*GjP ;S= continue;
Mu_i$j$vvP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
T#:F]= {
'!vc/Hw SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
LU!1s@ bProcessed=TRUE;
-'rj&x{Q)U }
iZ[tHw|| }
Q"a2.9Eo }
Z#`0txCF if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
SP
2 8 for(int index=0;index<MAX_KEY;index++){
-7'#2P<) if(hCallWnd[index]==NULL)
9CUimZ continue;
IN^9uL]B if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
4lc)& SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
*2u
E //lParam的意义可看MSDN中WM_KEYDOWN部分
8dT'xuch }
:s8A:mx }
}\v^+scD }
5IMSNGS return CallNextHookEx( hHook, nCode, wParam, lParam );
!jS4!2' }
hN`gB#N3 v@ONo?) 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:
+I|8Q|^SD X7aXxPCq1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
6(56,i<#/ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
OsW"CF2 TW`mxj_J2 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:
g jG2 #G_/.h@ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
x;$|#]+
{
<Mgf]v.QS if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
~] =?b)B {
||TtNH //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
[h}K$q SaveBmp();
!awh*Xj6 return FALSE;
Oo%!>!Lt, }
3
%(Y$8U …… //其它处理及默认处理
AfWl6a?T8: }
rFag@Z"[" :q2YBa K, (65>86; 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。
993d/z|DX Mps
*}9 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。
i|2$8G3 \ 3NS>v[1 二、编程步骤
FuP}Kec m% bE-# 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";
#0MK(Ut/ `6 Y33bQ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
xcSR{IZ `ENP=kL(+ 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;
./maY1>T |Mg }2!/L 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;
!y vJpdsof q@ Kk\m 5、 添加代码,编译运行程序。
[%.18FWI Gj6. Iv 三、程序代码
2:J,2=% nTZ> |R) ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
S!j^|! #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
wkT;a&_ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
RebTg1vGu #if _MSC_VER > 1000
N^$9;CKP= #pragma once
!P|5#.eC #endif // _MSC_VER > 1000
2,AaP*, #ifndef __AFXWIN_H__
D3?N<9g #error include 'stdafx.h' before including this file for PCH
Qyj(L[K J #endif
.w'vD/q; #include "resource.h" // main symbols
jKt-~: class CHookApp : public CWinApp
&tBA^igXK {
^@_).:oX7 public:
_^;;i4VZ CHookApp();
KSOO?X0j // Overrides
O_CT+Ou // ClassWizard generated virtual function overrides
x}"Q8kD //{{AFX_VIRTUAL(CHookApp)
>~&(P_<b public:
x YT}>#[ virtual BOOL InitInstance();
EhXiv#CZ virtual int ExitInstance();
e{t=>vry //}}AFX_VIRTUAL
WFh@%j //{{AFX_MSG(CHookApp)
aF])"9 // NOTE - the ClassWizard will add and remove member functions here.
T'R,vxP)\ // DO NOT EDIT what you see in these blocks of generated code !
;:_(7| //}}AFX_MSG
wW()Zy0) DECLARE_MESSAGE_MAP()
t-lv|%+8 };
uYTCd ZQh LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
#{>uC&jD BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
F"BL#g66 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
:`zV
[A:D BOOL InitHotkey();
v |ifI BOOL UnInit();
IO[^z
v4F #endif
('BLU.7IX 9r8D*PvS //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
t&f" jPu> #include "stdafx.h"
[aNhP;< #include "hook.h"
~u2w`H?V #include <windowsx.h>
Ars,V3ep #ifdef _DEBUG
6PJ'lA;*b #define new DEBUG_NEW
('HxHOh2 #undef THIS_FILE
t&pGQ static char THIS_FILE[] = __FILE__;
66dTs,C #endif
;Id"n7W #define MAX_KEY 100
I7b i@t #define CTRLBIT 0x04
6H6Law!) #define ALTBIT 0x02
^f0(aYWx #define SHIFTBIT 0x01
86{ZFtv #pragma data_seg("shareddata")
~>w:;M=sV8 HHOOK hHook =NULL;
96)v#B?p UINT nHookCount =0;
>t,O2~ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
YE_6OLW static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
1)Eq&ASB static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
{_Np<r;j< static int KeyCount =0;
|`v^ d| static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[)iN)$Mv #pragma data_seg()
KT=a(QL HINSTANCE hins;
y^YVo^3 void VerifyWindow();
2$DSBQEx BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
BJIFl!w //{{AFX_MSG_MAP(CHookApp)
_Ff".t<" // NOTE - the ClassWizard will add and remove mapping macros here.
7?"9J`* // DO NOT EDIT what you see in these blocks of generated code!
]0YDb~UB //}}AFX_MSG_MAP
AgCs;k&IG END_MESSAGE_MAP()
(-'PD_| i]@c.QiFN CHookApp::CHookApp()
YR8QO-7
.) {
wKLN:aRF2 // TODO: add construction code here,
ebD{ pc`& // Place all significant initialization in InitInstance
%\l0-RA@< }
&&*wmnWCS{ [[$Mh_MD CHookApp theApp;
Y)v% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Hq-v@@0 * {
Uk|9@Auav BOOL bProcessed=FALSE;
hvL6zCi if(HC_ACTION==nCode)
`{WCrw6) {
b8e*Pv/ if((lParam&0xc0000000)==0xc0000000){// Key up
N&,"kRFFo switch(wParam)
{~"Em'}J {
YiO3<}Uf case VK_MENU:
ZgK@Fl*k MaskBits&=~ALTBIT;
tB!|p 6 break;
gvK"*aIj case VK_CONTROL:
X)y*#U MaskBits&=~CTRLBIT;
>["Kd.ye break;
"|\94 case VK_SHIFT:
hN}5u"pS MaskBits&=~SHIFTBIT;
%D. @L break;
[@zkv)D6 default: //judge the key and send message
lvG3<ls0K$ break;
. *Z#cq0 }
F-i&M1\_ for(int index=0;index<MAX_KEY;index++){
|:}L<9Sq if(hCallWnd[index]==NULL)
0x6@{0 continue;
}:"R-s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ELD
+:b {
P0Aas)! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
sbpu
qOL bProcessed=TRUE;
,qYf#fU#7 }
={OCa1 }
KM E XT$p }
$/os{tzjd else if((lParam&0xc000ffff)==1){ //Key down
&9k"9 switch(wParam)
i /C'0 {
l; */M.B case VK_MENU:
B piEAwh MaskBits|=ALTBIT;
S[ i$e break;
\:C%>
.VG case VK_CONTROL:
xvHOY: MaskBits|=CTRLBIT;
"_Zh5
g break;
mJ/^BT] case VK_SHIFT:
QK,=5~I J MaskBits|=SHIFTBIT;
:0{AP_tvcC break;
-<_+-t
default: //judge the key and send message
Cnk#Ioz break;
'\4c "Ho }
(1OW6xtfG for(int index=0;index<MAX_KEY;index++)
;k-g_{M {
}D(DU5r if(hCallWnd[index]==NULL)
_8Pmv$ continue;
s-fKh` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PZ~`O {
EC0zH#N SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
n&3iz05} bProcessed=TRUE;
e3G7K8 }
.`b4h"g: }
q=J9LQ }
T %$2k> if(!bProcessed){
@^BS# for(int index=0;index<MAX_KEY;index++){
2J1B$.3' if(hCallWnd[index]==NULL)
5^bh.uF continue;
3KB|NS if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
V,`!rJ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`e4o 1* }
ZE{aS4c }
dVij <! Lu }
r{bgTG return CallNextHookEx( hHook, nCode, wParam, lParam );
?L`MFR }
jo]m12ps )j$b9ZBk BOOL InitHotkey()
p|xs|O6{ {
wV7@D[8 if(hHook!=NULL){
>B @i
E nHookCount++;
tj`tLYOZ@- return TRUE;
p`shYyE }
[P (rY else
9(i0"hS^ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
&Xj {:s# if(hHook!=NULL)
5)h+(u C3 nHookCount++;
\H},ouU return (hHook!=NULL);
W*1d
X"S }
#i'C BOOL UnInit()
T2;v<( {
.~FKyP>[$ if(nHookCount>1){
@&/s~3 nHookCount--;
3U :YA&K( return TRUE;
`NYF?% }
7Y$4MMNQ BOOL unhooked = UnhookWindowsHookEx(hHook);
u<BHf@AI if(unhooked==TRUE){
ay!6T`U` nHookCount=0;
=ip~J<sw& hHook=NULL;
liBAJx }
HQ ELK return unhooked;
BT
y]!%r' }
v4nvZ6 0(Yh~{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Nv}U/$$S {
)*q7pO\cty BOOL bAdded=FALSE;
&<\4q for(int index=0;index<MAX_KEY;index++){
t?pIE cl if(hCallWnd[index]==0){
B<vvsp\X hCallWnd[index]=hWnd;
!Qj)tS#Az HotKey[index]=cKey;
&;SwLDF"1 HotKeyMask[index]=cMask;
yf0vR%,\ bAdded=TRUE;
K|P9uHD KeyCount++;
u K+9gTv break;
# CP9^R S }
7UeE(=Hr5 }
,n
/SDEL return bAdded;
1Xk{(G<\ }
c+)36/; X kMfc"JXF BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
FF~on06! {
AQJ|^'% BOOL bRemoved=FALSE;
o(v"?Y 6 for(int index=0;index<MAX_KEY;index++){
&etL&s v if(hCallWnd[index]==hWnd){
0xvMR&.H if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Cy`<^_i hCallWnd[index]=NULL;
F)[XIY&2/ HotKey[index]=0;
s0X/1Cq HotKeyMask[index]=0;
% 8rr*l5 bRemoved=TRUE;
-52@%uB KeyCount--;
TsFV
;Sl3 break;
kx;xO>dC }
B` t6H }
8gu'dG = }
02]8|B(E90 return bRemoved;
&sr:\Qn X/ }
PU]7c2.y 5p#o1I void VerifyWindow()
iZDb.9@&t {
!>a&`j2:W for(int i=0;i<MAX_KEY;i++){
8o%<.] if(hCallWnd
!=NULL){ df21t^0/
if(!IsWindow(hCallWnd)){ ~:ub
hCallWnd=NULL; *Dd(+NI
HotKey=0;
]*kP>
HotKeyMask=0; pUCEYR
KeyCount--; ^^t]vojX
} 82^
z-t{
} EA%#/n
} 'AAF/ 9
} EDPI*@>
luG023'
BOOL CHookApp::InitInstance() ur~Tql
{ FEm1^X#]
AFX_MANAGE_STATE(AfxGetStaticModuleState()); >h/)r6
hins=AfxGetInstanceHandle(); _^ CQ*+F
InitHotkey(); z$8e6*
return CWinApp::InitInstance(); ZPxOds1m
} 1A)wbH)
3Aqe;Wf9%+
int CHookApp::ExitInstance() >ji}j~cH
{ 6bA~mC^&
VerifyWindow(); $z`cMQ r
UnInit(); eJVOVPg<,
return CWinApp::ExitInstance(); Z7KB?1{G
} b& _i/n(
SzgY2+Qq
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file VfE^g\Ia
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7Dx .;
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ |RvpEy76
#if _MSC_VER > 1000 $fj"*
#pragma once Hjo:;s
#endif // _MSC_VER > 1000 RJ`/qXL
]ukj]m/@
class CCaptureDlg : public CDialog 7y)|^4X2
{ :`Zl\!]E`o
// Construction $+)x)1
public: am$-sh72
BOOL bTray; =`7)X\i@z
BOOL bRegistered; C7fi1~
BOOL RegisterHotkey(); !kHyLEV
UCHAR cKey; ,pGCgOG#}c
UCHAR cMask; u1pYlu9IW
void DeleteIcon(); s6eq?1l3
void AddIcon(); nHhD<a!
UINT nCount; RL]lt0O{
void SaveBmp(); .@/z-OgXg
CCaptureDlg(CWnd* pParent = NULL); // standard constructor HpjIp.
// Dialog Data =%nqMV(y
//{{AFX_DATA(CCaptureDlg) CB{k;H
enum { IDD = IDD_CAPTURE_DIALOG }; !z4Hj{A_
CComboBox m_Key; -c<1H)W
BOOL m_bControl; rTH[?mkf4
BOOL m_bAlt; ?XTg%U
BOOL m_bShift; |]2eGrGj4
CString m_Path; /S=;DxZ,r
CString m_Number; 2}xFv2X
//}}AFX_DATA |Z^c#R
// ClassWizard generated virtual function overrides )lngef
/D_
//{{AFX_VIRTUAL(CCaptureDlg) gp|7{}Q{
public: ~:RDw<PWp
virtual BOOL PreTranslateMessage(MSG* pMsg); aBA#\eV
protected: >FMT#x t
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TF}4X;3Dsy
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \ /X!tlwxh
//}}AFX_VIRTUAL WHD/s
// Implementation :xUl+(+
protected: ?` ZGM
HICON m_hIcon; ZC\.};.
// Generated message map functions
"ppb%=
//{{AFX_MSG(CCaptureDlg) o4I!VK(C#s
virtual BOOL OnInitDialog(); fb=$<0Ocj
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); PB3!;
afx_msg void OnPaint(); nLN6@
afx_msg HCURSOR OnQueryDragIcon(); qwq+?fj={
virtual void OnCancel(); smLDm
afx_msg void OnAbout(); @*`UOgP7
afx_msg void OnBrowse(); |{|r?3
afx_msg void OnChange(); G]3ML)l
//}}AFX_MSG ^$s~qQQ}B
DECLARE_MESSAGE_MAP() Iz$W3#hi
}; J'Mgj$T $
#endif 5)zh@aJ@
.]P;fCQmM
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |EEz>ci
#include "stdafx.h" S
bqM=I+
#include "Capture.h" p~zTRnm
#include "CaptureDlg.h" a518N*]j
#include <windowsx.h> uL2{v
#pragma comment(lib,"hook.lib") Vwh&^{Eh
#ifdef _DEBUG qu~"C,
#define new DEBUG_NEW LXEu^F~{u#
#undef THIS_FILE p$!+2=)gY
static char THIS_FILE[] = __FILE__; s"Pk-Dv
#endif i\R\bv[9
#define IDM_SHELL WM_USER+1 $q@RHcj
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )eGu4iEPM
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 02c.;ka3
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [Jh))DIx
class CAboutDlg : public CDialog >fzzrD}]
{ Vi-!E
public: AYQh=$)(
CAboutDlg(); CH_Dat>
// Dialog Data h*X%:UbW
//{{AFX_DATA(CAboutDlg) . eag84_
enum { IDD = IDD_ABOUTBOX }; eRqexqO!
//}}AFX_DATA ,["|wqM
// ClassWizard generated virtual function overrides d~1"{WPSn
//{{AFX_VIRTUAL(CAboutDlg) 'N,NG$G2
protected: 6Oqnb+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D30Z9_^%:
//}}AFX_VIRTUAL mM^8YL
// Implementation LVcy.kU@]
protected: ppo$&W
&z
//{{AFX_MSG(CAboutDlg) H=SMDj)s+
//}}AFX_MSG :x5o3xE
DECLARE_MESSAGE_MAP() Pv$"DEXA2
}; 6g,3s?aT
d~bH!P
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mbG^fy'
{ WF.$gBH"
//{{AFX_DATA_INIT(CAboutDlg) 8_,wOkk_B
//}}AFX_DATA_INIT exMPw;8
} y42T.oK8c
}6{ )Jv
void CAboutDlg::DoDataExchange(CDataExchange* pDX) q>l kLHS
{ C]cT*B^
CDialog::DoDataExchange(pDX); aZCZ/
//{{AFX_DATA_MAP(CAboutDlg) 5N</Z6f'o
//}}AFX_DATA_MAP n)7$xYuH
} ]be2jQx3
+O:pZz
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +#"Ic:
//{{AFX_MSG_MAP(CAboutDlg) (V%vFD1)
// No message handlers X!HSS/'
//}}AFX_MSG_MAP k)t8J \
END_MESSAGE_MAP() -+2xdLa63
d1_*!LW$
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .B-,GD}
: CDialog(CCaptureDlg::IDD, pParent) ;? QAPTz
{ $,v+i
-
//{{AFX_DATA_INIT(CCaptureDlg) Z42 Suy
m_bControl = FALSE; r\- k/ 0
m_bAlt = FALSE; [B;Ek\ 5W
m_bShift = FALSE; M#<fh:>
m_Path = _T("c:\\"); ZaV66Y>
m_Number = _T("0 picture captured."); !_z>w6uR
nCount=0; FJH8O7
bRegistered=FALSE; c] 9CN
bTray=FALSE; K]Cs2IpI
//}}AFX_DATA_INIT qBrZg
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 y(BLin!O.
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e$|)wOwU
} fe`G^hV
.Eyk?"^
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) HSFf&|qqx
{ gG> ^h1_o~
CDialog::DoDataExchange(pDX); ?PtRb:RHt
//{{AFX_DATA_MAP(CCaptureDlg) -^yc yZ
DDX_Control(pDX, IDC_KEY, m_Key); 1ORi]`
DDX_Check(pDX, IDC_CONTROL, m_bControl); Q"_T040B
DDX_Check(pDX, IDC_ALT, m_bAlt); tl#s:
DDX_Check(pDX, IDC_SHIFT, m_bShift); 6y!?xot
DDX_Text(pDX, IDC_PATH, m_Path); X(q=,^Mp
DDX_Text(pDX, IDC_NUMBER, m_Number); ~a,'
//}}AFX_DATA_MAP ]* Ki7h|B
} 1MFpuPJk
| (9FV^_
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $ aBSr1
//{{AFX_MSG_MAP(CCaptureDlg) 6HQwL\r79
ON_WM_SYSCOMMAND() A{T@O5ucj
ON_WM_PAINT() m|gd9m$,?
ON_WM_QUERYDRAGICON() JJ06f~Iw[
ON_BN_CLICKED(ID_ABOUT, OnAbout) A{"t0Ai='0
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 9 9BK/>R
ON_BN_CLICKED(ID_CHANGE, OnChange) q)y8Bv|
//}}AFX_MSG_MAP mV]g5>Q\
END_MESSAGE_MAP() n
9M6wS
VQ}3r)ch
BOOL CCaptureDlg::OnInitDialog() l:}4
6%
{ euC,]n.
CDialog::OnInitDialog(); ee[NZz
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Pt;Ahmi
ASSERT(IDM_ABOUTBOX < 0xF000); RIx6& 7$
CMenu* pSysMenu = GetSystemMenu(FALSE); iFchD\E*o
if (pSysMenu != NULL) UHHKI)(
{ k}qiIMdI
CString strAboutMenu; hvZR4|k>
strAboutMenu.LoadString(IDS_ABOUTBOX); CUcjJ|MZ
if (!strAboutMenu.IsEmpty()) mQuaO#
I,
{ @y&,e,3!
pSysMenu->AppendMenu(MF_SEPARATOR); X}^gmu<Vla
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); xM,(|p(
} ;g9:0,xT4
} bd;f@)X
SetIcon(m_hIcon, TRUE); // Set big icon <OB~60h"
SetIcon(m_hIcon, FALSE); // Set small icon > PA,72e
m_Key.SetCurSel(0); 6VE5C
g
RegisterHotkey(); sUMn
(@r
CMenu* pMenu=GetSystemMenu(FALSE); ^C
T}i'
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8nR,GW\
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &cE,9o%FZ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a}hM}U!
return TRUE; // return TRUE unless you set the focus to a control {627*6,
} z9w.=[Io
xK 'IsMo[
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (j"MsCwE
{ 5aQg^f%\
if ((nID & 0xFFF0) == IDM_ABOUTBOX) yt,;^o^
{ fdHxrH>*
CAboutDlg dlgAbout; feHAZ.8rp+
dlgAbout.DoModal(); *&MkkI#
} LRs;>O
else >*CK@"o
{ L@GD$F=<0
CDialog::OnSysCommand(nID, lParam); ^2@~AD`&h
} (Ad!hyE(
} o|C{ s
;wB3H
void CCaptureDlg::OnPaint() x*V<afLY[
{ ! .}{
f;Ls
if (IsIconic()) pdq h'+5
{ )Cfrqe1^
CPaintDC dc(this); // device context for painting +2O_LPV$,
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4N:
;Mo&B
// Center icon in client rectangle 6>J#M
int cxIcon = GetSystemMetrics(SM_CXICON); _gh7_P^H=d
int cyIcon = GetSystemMetrics(SM_CYICON); z6(Q
3@iO
CRect rect; Ba~Iy2\x
GetClientRect(&rect); 4VgDN(n0@
int x = (rect.Width() - cxIcon + 1) / 2; P^-9?uBno
int y = (rect.Height() - cyIcon + 1) / 2; ?yK\L-ad
// Draw the icon ]aL}&GlHt
dc.DrawIcon(x, y, m_hIcon); $vz%
} ^Yz05\
else ZZ7U^#RT
{ e vuP4-[y
CDialog::OnPaint(); =<xbE;,0
} k=_@1b-
} W -&5
v
_Oq\YQb v
HCURSOR CCaptureDlg::OnQueryDragIcon() &.B6P|N'
{ IrC=9%pd$R
return (HCURSOR) m_hIcon; L;`t%1
} k6S<46}h|
O ?Tg`] EX
void CCaptureDlg::OnCancel() ?Y* PVx9Y
{ YZ@-0_Z
if(bTray) 2=EKAg=S
DeleteIcon(); [%kucG C7
CDialog::OnCancel(); _TF>c:m3
} Zlo,#q
")
D!OW]
void CCaptureDlg::OnAbout() Hc9pWr"N
{ EVsZ:Ra^k
CAboutDlg dlg; t;3.;
dlg.DoModal(); AF6'JxG7
} ba13^;fm#
H=C;g)R
void CCaptureDlg::OnBrowse() P+h&tXZn8
{ 67?5Cv
CString str; G]CY3xw98
BROWSEINFO bi; 'o L8Z
char name[MAX_PATH]; qzz'v
ZeroMemory(&bi,sizeof(BROWSEINFO)); M5uN1*
bi.hwndOwner=GetSafeHwnd(); !4:,,!T
bi.pszDisplayName=name; oDa{HP\O]W
bi.lpszTitle="Select folder"; TZg7BLfy
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2Fi*)\{
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~l~g0J
if(idl==NULL) ): 6d_g{2
return; .>n|#XK
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); bE~lc}%
str.ReleaseBuffer(); k7*q.2 0
m_Path=str; @AOiZOH
if(str.GetAt(str.GetLength()-1)!='\\') QL#y)G53Q
m_Path+="\\"; cx}-tj"m-
UpdateData(FALSE); k9n93I|Cm
} hLRQ)
pyKag;ZtP
void CCaptureDlg::SaveBmp() ,e2va7}3
{ ,H*3_c&Q
CDC dc; #ZA
YP
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 30@ GFaab
CBitmap bm; Hik[pVK@
int Width=GetSystemMetrics(SM_CXSCREEN); 9&cZIP
int Height=GetSystemMetrics(SM_CYSCREEN); [@6iStRg7
bm.CreateCompatibleBitmap(&dc,Width,Height); }^muAr
CDC tdc; z{\.3G
tdc.CreateCompatibleDC(&dc); jxvVp*-=<j
CBitmap*pOld=tdc.SelectObject(&bm); nP^$p C
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); HdM;c*K
tdc.SelectObject(pOld); tANG ]
BITMAP btm; /
<p HDY
bm.GetBitmap(&btm); 0N.*c
DWORD size=btm.bmWidthBytes*btm.bmHeight; jTnu! H2o
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /7^~*
BITMAPINFOHEADER bih; H;2pk
bih.biBitCount=btm.bmBitsPixel; (&(f`c@I
bih.biClrImportant=0;
<T).+
M/
bih.biClrUsed=0; Cp%|Q.?
bih.biCompression=0; EeO{G*pq
bih.biHeight=btm.bmHeight; W=!f
bih.biPlanes=1; rAKdf??
bih.biSize=sizeof(BITMAPINFOHEADER); I1gu<a
bih.biSizeImage=size; }wVrmDh \
bih.biWidth=btm.bmWidth; !T*izMX}
bih.biXPelsPerMeter=0; 9=|5-?^
bih.biYPelsPerMeter=0; !r<7]nwV
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); lK-I[i!
static int filecount=0; :"4~VDu
CString name; }MNm>3
name.Format("pict%04d.bmp",filecount++); cF6|IlhO
name=m_Path+name; duI8^&|
BITMAPFILEHEADER bfh; L6m'u6:1{
bfh.bfReserved1=bfh.bfReserved2=0; C7{w I`~
bfh.bfType=((WORD)('M'<< 8)|'B'); Q *he%@w
bfh.bfSize=54+size; y_6HQ:
bfh.bfOffBits=54; wrbDbp1L
CFile bf; (rJvE*
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ O%r<I*T^r
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Ot?rsr
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); fOVRtSls
bf.WriteHuge(lpData,size); xk/(|f{L
bf.Close(); >L%%B-
nCount++; DxlX-
} {)mlXo(On
GlobalFreePtr(lpData); :|a[6Uwl\V
if(nCount==1) ydt1ED0Q-
m_Number.Format("%d picture captured.",nCount); 3r\QLIr L8
else nMhc3t
m_Number.Format("%d pictures captured.",nCount); .NKN2
UpdateData(FALSE); !>Xx</iD1
} L|<Mtw
+ '`RJ,K+[
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5GKz@as8
{ 9g7T~|P
if(pMsg -> message == WM_KEYDOWN) %^S1 fUwT
{ zSu2B6YU}
if(pMsg -> wParam == VK_ESCAPE) Xy._&&pt
return TRUE; J8jbtL O'
if(pMsg -> wParam == VK_RETURN) 2,+H;Ypi!
return TRUE; 7P
} <t8})
return CDialog::PreTranslateMessage(pMsg); 2h=RNU|
} wNlp4Z'[
fRiHs\+
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8L:0Wp
{ {?8rvAjY
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?^dyQhb
SaveBmp(); 9:1ZL_yf
return FALSE; S7bSR?~L[
} ;.iy{&$
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5q\]] LV>
CMenu pop; TtzB[F
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [Y[|:_+5
CMenu*pMenu=pop.GetSubMenu(0); fA8 ,wy|>
pMenu->SetDefaultItem(ID_EXITICON); ?g 3sv5\u
CPoint pt; #u~8Txt
GetCursorPos(&pt); R#0UwRjeF
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %n^]1R#
if(id==ID_EXITICON) #r\uh\Cy
DeleteIcon(); =#W6+=YN8
else if(id==ID_EXIT) v"j7},P@
OnCancel(); L(.5:&Y=`
return FALSE; k20tn
ew
} G]{)yZ'}
LRESULT res= CDialog::WindowProc(message, wParam, lParam); y0xte&
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >">-4L17m
AddIcon(); 139_\=5|U/
return res; Y9ru~&/o$
} qg_=5s
ujaaO6oZ7
void CCaptureDlg::AddIcon() o!Y7y1$
{ MD +Q_
NOTIFYICONDATA data; +7=3[K
data.cbSize=sizeof(NOTIFYICONDATA); Lr`yl$6
CString tip; (uSfr]89'
tip.LoadString(IDS_ICONTIP); S;Vj5
data.hIcon=GetIcon(0); [ACa<U/
data.hWnd=GetSafeHwnd(); um/iK}O
strcpy(data.szTip,tip); &W1cc#(
data.uCallbackMessage=IDM_SHELL; r'&VH]m
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;X8eZQ
data.uID=98; #jQITS7
Shell_NotifyIcon(NIM_ADD,&data); a$ Z06j
ShowWindow(SW_HIDE); =cxjb,r
bTray=TRUE; SJ<nAX
} 0L'h5i>H)
O[!]/qP+.
void CCaptureDlg::DeleteIcon() HJDM\j*5
{ )gZ yW
NOTIFYICONDATA data; uKK+V6}!kj
data.cbSize=sizeof(NOTIFYICONDATA); *t63c.S
data.hWnd=GetSafeHwnd(); Up~#]X
data.uID=98; &U:;jlST9
Shell_NotifyIcon(NIM_DELETE,&data); $aEL>,X
ShowWindow(SW_SHOW); \]zHM.E1
SetForegroundWindow(); u-D%: lz85
ShowWindow(SW_SHOWNORMAL); Zf ;U=]R
bTray=FALSE; GujmBb
} 'Je;3"@
BPW2WSm@<
void CCaptureDlg::OnChange() U2;_{n*g%
{ WmeV[iI
RegisterHotkey(); k/>k&^?
} Z<`QDBN"4
3qP!
(*
BOOL CCaptureDlg::RegisterHotkey() nBR4j?':i
{ yN9/'c~
UpdateData(); YH@^6Be9
UCHAR mask=0; +d<o2n4!
UCHAR key=0; eGjEO&$
if(m_bControl) *5u0`k^j
mask|=4; 'bTtdFvJ
if(m_bAlt) q>t#5Z81
mask|=2; b}WU
if(m_bShift) @u?m4v{
mask|=1; R,8;GS42
key=Key_Table[m_Key.GetCurSel()]; +Y-Gp4"
if(bRegistered){ fTMn
DeleteHotkey(GetSafeHwnd(),cKey,cMask); EW]rD
bRegistered=FALSE; #V@[<S2
} 4PR!OB
cMask=mask; A|7%j0T
cKey=key; idEhxvAo
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /;
w(1)B
return bRegistered; 13kl\<6
} b-,4< H8m
f<<1.4)oSV
四、小结
(cx
Q<5
tw,uV)xm
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。