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:
$ "Afy)Ir
"E.\6sC 一、实现方法
8)N0S% B 7egq4gN]2Y 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:
y k?SD1hj FyCBNtCv #pragma data_seg("shareddata")
7g-Dfg.w HHOOK hHook =NULL; //钩子句柄
#`/bQ~s UINT nHookCount =0; //挂接的程序数目
dIma{uv static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
$h,d?
.u6w static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
+<&E3O r static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
w{3ycR static int KeyCount =0;
+|6`E3j% static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
cI5N"U@yN #pragma data_seg()
]* 0(-@
4bnt=5] 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
oWI!u 5 fTBVvY4( DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
*\D}eBd| jDkm:X}: BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
GSP?X$E cKey,UCHAR cMask)
012Lwd {
yX`#s]M BOOL bAdded=FALSE;
((qGh>* for(int index=0;index<MAX_KEY;index++){
?b56AE if(hCallWnd[index]==0){
avg4K*v v hCallWnd[index]=hWnd;
{#N%Bq} HotKey[index]=cKey;
\6{LR& HotKeyMask[index]=cMask;
P/G>/MD/l bAdded=TRUE;
)AI?x@ KeyCount++;
JRXRi*@ break;
7{4w2) }
d.p'pGL }
;`+`#h3-V return bAdded;
5Dd:r{{ Q }
)9B:Y;>) //删除热键
zd.'*Dj BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
okstY4f' {
NEw$q4 BOOL bRemoved=FALSE;
Ps3~{zH` for(int index=0;index<MAX_KEY;index++){
BKay*!'PX if(hCallWnd[index]==hWnd){
->h5T%sn if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
%&h c"7/k hCallWnd[index]=NULL;
KzNm^^#/$A HotKey[index]=0;
FIS "Z( HotKeyMask[index]=0;
nM8[ bRemoved=TRUE;
IB8gDP2 KeyCount--;
0elxA8Z~e break;
E=]]b;u-n }
>'b=YlUL }
\x(^]/@ }
Z/g]o# return bRemoved;
VO_dA4C}z }
R5(F)abi H:Y&OZ n'M>xq_ DLL中的钩子函数如下:
Ys3uPs )c+k_;t'+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
UFw](%=&M {
Juu+vMn1 BOOL bProcessed=FALSE;
G?xJv`"9iC if(HC_ACTION==nCode)
O m9jtWk {
)M:)y if((lParam&0xc0000000)==0xc0000000){// 有键松开
{$33B'wk switch(wParam)
%j5ywr: {
?:uNN case VK_MENU:
C?o6(p"b MaskBits&=~ALTBIT;
(` c
G break;
E
oe}l
case VK_CONTROL:
50$W0L$ MaskBits&=~CTRLBIT;
Ryv_1gR! break;
I2[]A,f, case VK_SHIFT:
2 hq\n< MaskBits&=~SHIFTBIT;
#]Y*0Wzpfn break;
a
<wL#Id default: //judge the key and send message
>bIF>9T break;
5jZiJw( }
x-;`-Uo% for(int index=0;index<MAX_KEY;index++){
`]<`$71w if(hCallWnd[index]==NULL)
gKi{Y1 continue;
=J/ FJb if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>2lwWXA {
:NE/Ddgc' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
;gB`YNL bProcessed=TRUE;
!20XsO }
efOjTA% }
3CZS) }
`hUHel;6 else if((lParam&0xc000ffff)==1){ //有键按下
?9xu{B>6 switch(wParam)
q>s`uFRg( {
5/@UVY9_ case VK_MENU:
K{=PQ XSU MaskBits|=ALTBIT;
4 b,N8 break;
."6[:MF case VK_CONTROL:
@~:8ye MaskBits|=CTRLBIT;
Ed-M7#wY break;
Or+p%K}-7 case VK_SHIFT:
$/Ov2z MaskBits|=SHIFTBIT;
$kPHxD!" break;
~ ?^/u8 default: //judge the key and send message
n7! H:{L break;
1cC1*c0Z }
>:
Wau for(int index=0;index<MAX_KEY;index++){
(f#b7O-Wn if(hCallWnd[index]==NULL)
n}n EcXb continue;
h{'t5&yY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
m_7
nz!h {
MesRa( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
5V5w:U>_z bProcessed=TRUE;
D4u%6R|F }
z5 m>H;P }
"484n/D }
{?8B,G2r if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
@g-Tk for(int index=0;index<MAX_KEY;index++){
nJFg^s1 if(hCallWnd[index]==NULL)
V5mTu)tp5 continue;
=|U@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#x@ eDnb_ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
UKBJ_r //lParam的意义可看MSDN中WM_KEYDOWN部分
7hw .B'7 }
EbQa? }
EqB)sK/3 }
zGlZ!t: return CallNextHookEx( hHook, nCode, wParam, lParam );
Ud(`V:d }
=;L*<I <V&5P3)d9 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
q_fam,9 L^`}J7r BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
19U]2D/z BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
]0j9>s2|Z c-4STPNQi 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
)%Iv[TB[ a2@c%i LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
lS5ny {
1Y j~fb( if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
dY!Z {
|V,<+BEi //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
8?FueAM'
SaveBmp();
*C| return FALSE;
PL=^}{r }
TLa]O1=Bf. …… //其它处理及默认处理
~mz%E }
9J-b6, 3`.P'Fh(k 3251Vq % 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
VR?^HA9 N:5[,O<m_ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
%eWqQ3{P] fz_nsVD 二、编程步骤
S=|@L<O 1OaXo! 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
[\z/Lbn
,. )X+mV 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?\=/$Gt uKr1Z2 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;
kSncZ0K{ r#i?j}F} 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;
i'/m4 !>h n$L51#' 5、 添加代码,编译运行程序。
~p1EF;4 # eDKxn8+(H 三、程序代码
pJIv+ '-$XX%TOAc ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
= "ts`> #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
+C]&2zc. #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
B^ 7eo W #if _MSC_VER > 1000
I3b"|% #pragma once
7E$&2U^Js #endif // _MSC_VER > 1000
L:nXW z #ifndef __AFXWIN_H__
: esg( #error include 'stdafx.h' before including this file for PCH
gk0.zz([ #endif
qQ[b VD\* #include "resource.h" // main symbols
xb2?lL] class CHookApp : public CWinApp
R[tC^]ai {
7j<e)" public:
X@N$Z{ CHookApp();
"8f?h%t // Overrides
)=pD%$iq // ClassWizard generated virtual function overrides
Tb;d.^ //{{AFX_VIRTUAL(CHookApp)
t0&@h\K public:
dhPKHrS virtual BOOL InitInstance();
p&p.Q^"ok virtual int ExitInstance();
R6;Phdh<> //}}AFX_VIRTUAL
t:~t@4j} //{{AFX_MSG(CHookApp)
)}v3q6?_ // NOTE - the ClassWizard will add and remove member functions here.
gO?44^hMe // DO NOT EDIT what you see in these blocks of generated code !
q Dd~2"er //}}AFX_MSG
X?r48l?? DECLARE_MESSAGE_MAP()
RF}X
ER };
4Aes#{R3v LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
q}|U4MJm BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
% ~]xuP[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Ji'(`9F&a BOOL InitHotkey();
-XK0KYhgW BOOL UnInit();
&Nl2sey #endif
Z [Xa%~5>5 }alj[) //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
_cH@I?B #include "stdafx.h"
`|O yRU"EK #include "hook.h"
@~
Dh'w2q #include <windowsx.h>
t
!`Jse> #ifdef _DEBUG
>QE{O.Z #define new DEBUG_NEW
OWjJxORB #undef THIS_FILE
BG`s6aC|z< static char THIS_FILE[] = __FILE__;
^>&k]T` #endif
WKM)*@#, #define MAX_KEY 100
qem(s</: #define CTRLBIT 0x04
$P
o} #define ALTBIT 0x02
q0mOG^ #define SHIFTBIT 0x01
~,6b_W p/ #pragma data_seg("shareddata")
4DWwbO HHOOK hHook =NULL;
OKOu`Hz@ UINT nHookCount =0;
m*0,s static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
EOKzzX7 S static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
F N[R(SLbL static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
?^#lWx q static int KeyCount =0;
A~(l{g static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
;Q0bT`/X #pragma data_seg()
&NZfJs HINSTANCE hins;
x|64l`Vp(: void VerifyWindow();
Yd
cK&{ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
:6kj EI //{{AFX_MSG_MAP(CHookApp)
ygZ #y L // NOTE - the ClassWizard will add and remove mapping macros here.
q6P
wZ_ // DO NOT EDIT what you see in these blocks of generated code!
&O\(;mFc //}}AFX_MSG_MAP
bF}V4"d,B3 END_MESSAGE_MAP()
?dZt[vAMn ~|Y>:M+0Z CHookApp::CHookApp()
?NNn:t iD {
R5_i15< // TODO: add construction code here,
)QiQn=Ce // Place all significant initialization in InitInstance
?/*~;fM }
+?D6T!) hv$yV%.` CHookApp theApp;
^t"iX9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
qAkx<u {
\[2lvft! BOOL bProcessed=FALSE;
&sVvWNO#2 if(HC_ACTION==nCode)
9?T{}| ? {
~vdkFc(8B if((lParam&0xc0000000)==0xc0000000){// Key up
o/cjXun* switch(wParam)
M&Y .; {
}1 vT) case VK_MENU:
{4 >mc'dv MaskBits&=~ALTBIT;
!hxIlVd{ break;
O OFVnu case VK_CONTROL:
Z^KA MaskBits&=~CTRLBIT;
!7B\Xl'S break;
9<CG s3\ case VK_SHIFT:
72T I MaskBits&=~SHIFTBIT;
}}{!u0N},V break;
7XrfuG*L$ default: //judge the key and send message
Wk;5/ break;
=8G&3 R }
XV>JD/K2 for(int index=0;index<MAX_KEY;index++){
%5Kq^]q;Y if(hCallWnd[index]==NULL)
>"X\>M`" continue;
6`01EIk if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
|tMn={ {
Fnx`Ri SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
}w-wSkl1 bProcessed=TRUE;
Mc sTe|X }
&(rWw Oo6 }
{43yb_B( }
BF|(!8S$U else if((lParam&0xc000ffff)==1){ //Key down
)YW<" $s switch(wParam)
~!6K]hB4 {
aiCFH_H4;L case VK_MENU:
yTM{|D]$( MaskBits|=ALTBIT;
][PzgzG break;
nCg66-3A case VK_CONTROL:
}b3/b MaskBits|=CTRLBIT;
$.6K!x{( break;
dmrps+L case VK_SHIFT:
6Q|k7*,B MaskBits|=SHIFTBIT;
uw\1b.r'B break;
)+I.|5g default: //judge the key and send message
z(RL<N% break;
&Jc_Fc(M
}
&6 -k#r for(int index=0;index<MAX_KEY;index++)
yQS+P8x&|] {
}|)R
if(hCallWnd[index]==NULL)
w [>;a.$ continue;
k4J8O3E if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
:)f7A7 :; {
{aKqXL[UP SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
-php6$| bProcessed=TRUE;
=?0lA_
0 }
JF9yVE - }
10Wz,vW,n }
!4@G3Ae22 if(!bProcessed){
KP;(Q+qTx for(int index=0;index<MAX_KEY;index++){
;Z[]{SQ if(hCallWnd[index]==NULL)
n#Dv2 E=6 continue;
[t\B6XxT if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
"tit\a6\( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
{'+QH)w( }
zZ-wG }
f67NWFX }
bZ_mYyBh return CallNextHookEx( hHook, nCode, wParam, lParam );
Q~D`cc|] }
jd`},X / u),Qa=Wp BOOL InitHotkey()
Z[!d*O%R_ {
TOF
'2&H if(hHook!=NULL){
BDY}*cX nHookCount++;
hlZ@Dq%f return TRUE;
}G46g#_6d> }
W)j|rz. else
[mxTa\ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
UnDgu4#R`A if(hHook!=NULL)
3
vP(SIF nHookCount++;
r9 y.i(j return (hHook!=NULL);
Vpfp}pL }
PHg48Y"Nd BOOL UnInit()
I7 QCYB| {
t HD if(nHookCount>1){
@(``:)Z<b nHookCount--;
;Lw{XqT return TRUE;
"yziXT@V }
0rk]/--FGJ BOOL unhooked = UnhookWindowsHookEx(hHook);
QlFZO4 P3| if(unhooked==TRUE){
?zJpD8e nHookCount=0;
PeX1wK%f hHook=NULL;
@Fv=u }
/il@`w;G return unhooked;
!U_K&f }
>M%\T}5 <HWS:'1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E9j+o y {
O40+M)e] BOOL bAdded=FALSE;
U;_[b"SW% for(int index=0;index<MAX_KEY;index++){
:_<_[Y]1 if(hCallWnd[index]==0){
Z!d7&T} hCallWnd[index]=hWnd;
87!C@XlK_ HotKey[index]=cKey;
MOn,Db$ HotKeyMask[index]=cMask;
S&O3HC bAdded=TRUE;
{",MCu_V KeyCount++;
J;t 7&Zpe break;
?)Nj c&G }
CD j~;$[B }
e;bYaM4UX return bAdded;
dBsX*}C }
S|V4[ssB seFGJfN\?f BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
oq/G`{`\ {
D(W,yq~7uY BOOL bRemoved=FALSE;
p Y)5bSA for(int index=0;index<MAX_KEY;index++){
g3n'aD@'x if(hCallWnd[index]==hWnd){
NE8 jC7 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
<%}QDO8\i hCallWnd[index]=NULL;
.D,p@4 HotKey[index]=0;
N(6|yZ<J3M HotKeyMask[index]=0;
gbOpj3 bRemoved=TRUE;
-Lu)'+ KeyCount--;
<Tw>|cFT break;
uf<@ruN }
in <(g@Zg }
b2(RpY2Y }
i!2TH~zl return bRemoved;
l:;PXy6) }
(GnuWc\p l5%G'1w#,j void VerifyWindow()
@[<nQZw: {
_!;Me
)C for(int i=0;i<MAX_KEY;i++){
O-]mebTvw if(hCallWnd
!=NULL){ Ft=zzoVKg
if(!IsWindow(hCallWnd)){ 4!Z5og1kn
hCallWnd=NULL; onCKI,"
HotKey=0; 0C<[9Dl.G8
HotKeyMask=0; _iKq~\v2
KeyCount--; .Ig+Dj{)
} )M=ioE8`h
} |yyO q
} m42T9wSsx
} g,`A[z2
`.x$7!zLC
BOOL CHookApp::InitInstance() 65z"
{ a8u9aEB
AFX_MANAGE_STATE(AfxGetStaticModuleState()); }7fZ[J3
hins=AfxGetInstanceHandle(); M7f;Pa
InitHotkey(); rn DCqv!'P
return CWinApp::InitInstance(); ERwHLA
} WPZ?*Sx
Ze<K=Q%(i
int CHookApp::ExitInstance() hPq%Lc
{ s?8<50s
VerifyWindow(); G6VF>2
UnInit(); 4?N8R$
return CWinApp::ExitInstance(); tH=P6vY
} 4tg<iH{
a`Gx=8
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file JvYPC
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %0#1t 5g
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6nhMP$h
#if _MSC_VER > 1000 ) 9,
#pragma once HW&%T7
a
#endif // _MSC_VER > 1000 80A.<=(=.
OY[e.N
t&
class CCaptureDlg : public CDialog |6Gm:jV
{ r"$.4@gc
// Construction 7+./zN
public: Gm*X'[\DD
BOOL bTray; dEBcfya
BOOL bRegistered; A+@&"
BOOL RegisterHotkey(); UR:aD_h
UCHAR cKey; dr4Z5mw"E
UCHAR cMask; CctJFcEZ
void DeleteIcon(); :Hxv6
void AddIcon(); iy""(c
UINT nCount; keRE==(D
void SaveBmp(); }kg ye2[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;?C#IU
// Dialog Data <dyewy*.L
//{{AFX_DATA(CCaptureDlg) 8H[:>;SI
enum { IDD = IDD_CAPTURE_DIALOG }; R_=6GZH$G
CComboBox m_Key; Jk,;JQ
BOOL m_bControl; .`?@%{
BOOL m_bAlt; Vh>Z,()>>@
BOOL m_bShift; UGK*G y
CString m_Path; #^+DL]*l
CString m_Number; |>@W
]CX[
//}}AFX_DATA -G6U$
// ClassWizard generated virtual function overrides .s$z/Jv
//{{AFX_VIRTUAL(CCaptureDlg) V|\7')Qq
public: yDNOt C|
virtual BOOL PreTranslateMessage(MSG* pMsg); QeF3qXI
protected: !?Wp+e6
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uwlr9nB
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :1Sl"?xU
//}}AFX_VIRTUAL h=-"SW
// Implementation -*.-9B~u
protected: },|M9I0
HICON m_hIcon; v%Wx4v@%SE
// Generated message map functions [$[:"N_
//{{AFX_MSG(CCaptureDlg) (5\NB0
virtual BOOL OnInitDialog(); # W"=ry3{
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QY= = GfHt
afx_msg void OnPaint(); $ImrOf^qt
afx_msg HCURSOR OnQueryDragIcon(); .bio7c6
virtual void OnCancel(); 7`u$
afx_msg void OnAbout(); B#9{-t3Vf
afx_msg void OnBrowse(); &r:7g%{n
afx_msg void OnChange(); %.Q
!oYehj
//}}AFX_MSG !>:?rSg*
DECLARE_MESSAGE_MAP() $tl\UH7%2
}; r(9~$_(vK
#endif Sfdu`MQR
6uR^%W8]
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Jec'`,Y
#include "stdafx.h" K$d$m <
#include "Capture.h" OrK&RC
#include "CaptureDlg.h" ={u0_j
W
#include <windowsx.h> 6^DR0sO
#pragma comment(lib,"hook.lib") c [5KG}
#ifdef _DEBUG CD8}I85K
#define new DEBUG_NEW 33}oO,}t,
#undef THIS_FILE ,~._}E&9I
static char THIS_FILE[] = __FILE__; _Zr.ba
#endif 71l%MH
#define IDM_SHELL WM_USER+1 !kC*g
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V dn&c
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )rixMl &[
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G%Lt.?m[
class CAboutDlg : public CDialog V(E/'DR
{ aCL!]4K84$
public: W|o'&
CAboutDlg(); #BSTlz
// Dialog Data 'PP#^aI,
//{{AFX_DATA(CAboutDlg) 0P]E6hWgg
enum { IDD = IDD_ABOUTBOX }; iJ~Vl"|m
//}}AFX_DATA Ot`VR&}
// ClassWizard generated virtual function overrides y\x+
//{{AFX_VIRTUAL(CAboutDlg) ^,]B@t2
protected: JwXT%op9RP
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z0do;_x]E
//}}AFX_VIRTUAL :GJ &_YHf
// Implementation fYW6b[lI
protected: C/-63O_
//{{AFX_MSG(CAboutDlg) M4W5f#C5Ee
//}}AFX_MSG x@Hc@R<!
DECLARE_MESSAGE_MAP() ~#/hzS
}; 9WR6!.y#f
9rA=pH%<>B
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ft!],n-n*
{ "V}[':fen
//{{AFX_DATA_INIT(CAboutDlg) Kx%Sku<F'
//}}AFX_DATA_INIT /7YF mI/0
} |.3DD"*
_hk.2FV:3m
void CAboutDlg::DoDataExchange(CDataExchange* pDX) H_QsNf
{ lMbAs.!
CDialog::DoDataExchange(pDX); WH\))y-
//{{AFX_DATA_MAP(CAboutDlg) vZBc!AW
//}}AFX_DATA_MAP QMpoa5ZQG
} lO_UPC\@fw
BGu?<bET
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Zp#v Hs
//{{AFX_MSG_MAP(CAboutDlg) mOlI#5H
// No message handlers :dqn h
//}}AFX_MSG_MAP z'EajBB\f
END_MESSAGE_MAP()
D N*t~Z3[
=7o"u3hG
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) `{xNXH]@
: CDialog(CCaptureDlg::IDD, pParent) Jtk|w[4L
{ 5kz)5,KjM
//{{AFX_DATA_INIT(CCaptureDlg) c?,i3s+2Y
m_bControl = FALSE; 4tS.G
m_bAlt = FALSE; 1{r)L{]
m_bShift = FALSE; 5>\/[I/!
m_Path = _T("c:\\"); oGRhnP'PF+
m_Number = _T("0 picture captured.");
1wP-
nCount=0; k'5?M
bRegistered=FALSE; 4BKI-;v$
bTray=FALSE; )6J9J+%bi
//}}AFX_DATA_INIT a)'5Nw9*
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 b^$|Nz;
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); McQe1
} 2FW\O0U
K]0JC/R6(@
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ynhmMy%
{ f|tjsZxQ
CDialog::DoDataExchange(pDX); A?pbWt~}
//{{AFX_DATA_MAP(CCaptureDlg) <h'5cO
DDX_Control(pDX, IDC_KEY, m_Key); 6gs01c,BA
DDX_Check(pDX, IDC_CONTROL, m_bControl); -B$2\ZE
DDX_Check(pDX, IDC_ALT, m_bAlt); fu]s/'8B
DDX_Check(pDX, IDC_SHIFT, m_bShift); M!XsJ<jN/
DDX_Text(pDX, IDC_PATH, m_Path); 9B7^lR
DDX_Text(pDX, IDC_NUMBER, m_Number); :FTMmW,>'
//}}AFX_DATA_MAP t?'!$6
} ssN6M./6
_ "VkGG
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +P`*kj-P\
//{{AFX_MSG_MAP(CCaptureDlg) fV'ZsJ N
ON_WM_SYSCOMMAND() Ls] g
ON_WM_PAINT() z3;*Em8Ir
ON_WM_QUERYDRAGICON() Ot6aRk
ON_BN_CLICKED(ID_ABOUT, OnAbout) De(Hw&
IV
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,^ . 88<
ON_BN_CLICKED(ID_CHANGE, OnChange) j4R(B
//}}AFX_MSG_MAP 7M<'/s
END_MESSAGE_MAP() mh{1*T$fP
CyXRi}W.
BOOL CCaptureDlg::OnInitDialog() %*0^0wz
{ In<n&ib
CDialog::OnInitDialog(); |~vI3]}fx
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Pf\D-1gi
ASSERT(IDM_ABOUTBOX < 0xF000); W1|0Yd ;P
CMenu* pSysMenu = GetSystemMenu(FALSE); .G#8a1#
if (pSysMenu != NULL) x?2@9u8Yb
{ yooX$
CString strAboutMenu; P<a)25be/
strAboutMenu.LoadString(IDS_ABOUTBOX); Ke2ccN
if (!strAboutMenu.IsEmpty()) "Pu!dJ5[]
{ iCHOv {p.
pSysMenu->AppendMenu(MF_SEPARATOR); [8=vv7wS
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); r[b(I@T+
} t7j);W%e6
} <4g{ fT0
SetIcon(m_hIcon, TRUE); // Set big icon F|e1"PkeoA
SetIcon(m_hIcon, FALSE); // Set small icon =pS5uR~
m_Key.SetCurSel(0); )W;o<:x3
RegisterHotkey(); K,:cJ
CMenu* pMenu=GetSystemMenu(FALSE); ?7.7`1m!v
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); opy("qH
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'kL#]
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $JMXV
return TRUE; // return TRUE unless you set the focus to a control !y@NAa0
} %}Ss,XJ
?&63#B,iZ
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) CzRc%%BA
{ Of[XKFn_
if ((nID & 0xFFF0) == IDM_ABOUTBOX) _lGdUt 2
{ 4,CXJ2
CAboutDlg dlgAbout; 7 /VK##z
dlgAbout.DoModal(); +#lM
} DVB{2~7 4
else &:dH,
{ <b`E_
CDialog::OnSysCommand(nID, lParam); =}DR)
9
} g1W.mAA3B
} JGsx_V1t
2.l Z:VLN
void CCaptureDlg::OnPaint() {B?Wu3-
{ <UV1!2nv*
if (IsIconic()) -EkWs/'h
{ !Wy6/F@Z
CPaintDC dc(this); // device context for painting BGD8w2
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T|7}EAR=b
// Center icon in client rectangle MGR!Z@1y
int cxIcon = GetSystemMetrics(SM_CXICON); )4gJd?
8R
int cyIcon = GetSystemMetrics(SM_CYICON); TarIPp
CRect rect; ?'@8kpb
GetClientRect(&rect); #\.,? A}9
int x = (rect.Width() - cxIcon + 1) / 2; rV R1wsaL
int y = (rect.Height() - cyIcon + 1) / 2; i|w81p^o
// Draw the icon /%}*Xh
dc.DrawIcon(x, y, m_hIcon); 5_I->-<
} oX S1QT`B
else Bm.:^:&k
{ G7qG$wd8h
CDialog::OnPaint(); Tx|Ir+f6L
} =vDEfO/T
} h|VeG3H
}XV+gyG=@
HCURSOR CCaptureDlg::OnQueryDragIcon() 6r"eN%m
{ P9^-6;'Y
return (HCURSOR) m_hIcon; 9[b<5Llt
} n>+mL"hs
6*B1 9+-
void CCaptureDlg::OnCancel() 4zev^FR
{ DnCP
aM4%
if(bTray) < Z{HX[y
DeleteIcon(); )6,de2Pb
CDialog::OnCancel(); v(B<Nb
} !%^^ \,
v0-cd
void CCaptureDlg::OnAbout() }.3nthgz
{ h U`wVy
CAboutDlg dlg; gVq;m>\|F
dlg.DoModal(); :3XA!o&.T3
} pk?w\A}
#MX'^RZ>2
void CCaptureDlg::OnBrowse() ,k{#S?:b
{ BSYzC9h`
CString str; M=1n QF2J
BROWSEINFO bi; 0fb`08,^
char name[MAX_PATH]; A )^`?m3
ZeroMemory(&bi,sizeof(BROWSEINFO)); L\)ZC
bi.hwndOwner=GetSafeHwnd(); A?CcHw
rT
bi.pszDisplayName=name; #33fGmd[
bi.lpszTitle="Select folder"; WM| dKF
bi.ulFlags=BIF_RETURNONLYFSDIRS; W3IpHV
LPITEMIDLIST idl=SHBrowseForFolder(&bi); GNXHM*~
if(idl==NULL) As 3.Q(#Z
return; 1Ty<\bZ=
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); jNLw=
str.ReleaseBuffer(); {;N,t]>8M
m_Path=str; /tP|b_7O
if(str.GetAt(str.GetLength()-1)!='\\') b7NM#Hb
m_Path+="\\"; =NnNN'}
UpdateData(FALSE); mz@T
} ^HV>`Pjd}=
[q/Abz'i
void CCaptureDlg::SaveBmp() JRSSn] pw
{ (@%gS[]
CDC dc; "OQ^U_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); Y' %^NP}o
CBitmap bm; Y%PwktQm
int Width=GetSystemMetrics(SM_CXSCREEN); K8>zF/# +
int Height=GetSystemMetrics(SM_CYSCREEN); &>%T^Y|J4
bm.CreateCompatibleBitmap(&dc,Width,Height); Pl=ZRKn
CDC tdc; |?qquD 4=
tdc.CreateCompatibleDC(&dc); CjlKMbnBH
CBitmap*pOld=tdc.SelectObject(&bm); Sx?ua<`:d
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 3gv|9T
tdc.SelectObject(pOld); 7on.4/;M
BITMAP btm; in~D
bm.GetBitmap(&btm); k p<OJy
DWORD size=btm.bmWidthBytes*btm.bmHeight; ( M7pT
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a^`rtvT
BITMAPINFOHEADER bih; 0BIy>wy:
bih.biBitCount=btm.bmBitsPixel; JsDpy{q
bih.biClrImportant=0; {B[=?6tQ
bih.biClrUsed=0; -7S g62THS
bih.biCompression=0; !P)O(i=
bih.biHeight=btm.bmHeight; Z?%zgqTXb
bih.biPlanes=1; .Nw=[
bih.biSize=sizeof(BITMAPINFOHEADER); f>W-
bih.biSizeImage=size; QV{}K
bih.biWidth=btm.bmWidth; W7 Cc
bih.biXPelsPerMeter=0; oW<5|FaN
bih.biYPelsPerMeter=0; 95YL]3V
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Pb?$t
static int filecount=0; %kdEun
CString name; u/M+u;
name.Format("pict%04d.bmp",filecount++); c&AygqN
name=m_Path+name; 5<UVD:~z
BITMAPFILEHEADER bfh; DV _2P$tT|
bfh.bfReserved1=bfh.bfReserved2=0; DpUbzr41+k
bfh.bfType=((WORD)('M'<< 8)|'B'); S,Xnzrz
bfh.bfSize=54+size; (>r[-Bft
bfh.bfOffBits=54; ~y/
nlb!
CFile bf; S"xKL{5
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ a'2$nbp}
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .w0s%T,8}^
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~g5[$r-u-u
bf.WriteHuge(lpData,size); 8P1=[i]
bf.Close(); `[W[H(AjQ
nCount++; LN@F+CyDc
} i'#E)
GlobalFreePtr(lpData); mGJasn
if(nCount==1) ie2WL\tR4
m_Number.Format("%d picture captured.",nCount); Bs O+NP
else /+@p7FqlE
m_Number.Format("%d pictures captured.",nCount); `QyO`y=?[Y
UpdateData(FALSE); hRK/T7v
} ZuS0DPS`L
vSi.txV2
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !*oi!ysU;O
{ yF"1#{*y
if(pMsg -> message == WM_KEYDOWN) 0cJWJOj&
{ =Ur}~w&H8
if(pMsg -> wParam == VK_ESCAPE) WJ4li@T7V
return TRUE; [%77bv85.G
if(pMsg -> wParam == VK_RETURN) rEv$+pP
return TRUE; z@B=:tf
} A29gz:F(
return CDialog::PreTranslateMessage(pMsg); m^GJuPLW
} :}@g6
FW/W%^
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \}p6v }
{ /.Ww6a~
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <8d^^0
SaveBmp(); ?e,pN,4
return FALSE; }j*KcB_
} wnM9('\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ rL+!tH
CMenu pop; `kZ@Zmj#
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _Jme!Oaa
CMenu*pMenu=pop.GetSubMenu(0); 6P5Ih
pMenu->SetDefaultItem(ID_EXITICON); ENGg
~D
CPoint pt; YN!>}
GetCursorPos(&pt); ^(|vsFzn
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); UG'9*(*
if(id==ID_EXITICON) 0Sgaem`
DeleteIcon(); rz@=pR :
else if(id==ID_EXIT) ds?v'|
OnCancel(); ~ ; -! n;
return FALSE; pBETA'fY
} 20Z8HwQi
LRESULT res= CDialog::WindowProc(message, wParam, lParam); IFDZfx
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) yjhf
AddIcon(); " e}3:U5n
return res; =
Wu
*+paQ
} )tl.s)"N
F@<CsgKB-
void CCaptureDlg::AddIcon() TJ1+g
\
{ J,AR5@)1
NOTIFYICONDATA data; ?84
s4BpV1
data.cbSize=sizeof(NOTIFYICONDATA); m"o ;L3
CString tip; Zxbo^W[[
tip.LoadString(IDS_ICONTIP); <K8\n^i~c
data.hIcon=GetIcon(0); unBy&?&p
data.hWnd=GetSafeHwnd(); U5He?
strcpy(data.szTip,tip); 69J4=5lX
data.uCallbackMessage=IDM_SHELL; 4Rvf
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; G=A,9@+c
data.uID=98; uU:CR>=AKW
Shell_NotifyIcon(NIM_ADD,&data); ;~\MZYs3m
ShowWindow(SW_HIDE); F$hYKT2|
bTray=TRUE; #_(jS+lP?k
} 86\S?=J-b
IjR'Qou5
void CCaptureDlg::DeleteIcon() opJMS6%r
{ -tyK~aasQ
NOTIFYICONDATA data; GF5^\Rf
data.cbSize=sizeof(NOTIFYICONDATA); |"9 #bU
data.hWnd=GetSafeHwnd(); Xa[?^P
data.uID=98; o4zM)\;F
Shell_NotifyIcon(NIM_DELETE,&data); tc!wLnhG
ShowWindow(SW_SHOW); "B8"_D&
SetForegroundWindow(); NN1$'"@NL
ShowWindow(SW_SHOWNORMAL); K"[AxB'F
bTray=FALSE; YBP:q2H
} a'jR#MQl?
Xixqxm*8
void CCaptureDlg::OnChange() hQDTS>U
{ IrWD%/$H
RegisterHotkey(); E4W zU
} |R#"Th6mH!
<1.A=_
M
BOOL CCaptureDlg::RegisterHotkey() KhW;RD
{ NU*fg`w
UpdateData(); {nvLPUL
UCHAR mask=0; Wf&W^Q
UCHAR key=0; !\,kZ|#>
if(m_bControl) <@Fy5k-%.
mask|=4; ,57`D'
if(m_bAlt) Gsc\/4Wx
mask|=2; acw4B5]
if(m_bShift) \C`~S7jC
mask|=1; .^m>AKC0cX
key=Key_Table[m_Key.GetCurSel()]; aKd+CO:
if(bRegistered){ YNBHBK4;
DeleteHotkey(GetSafeHwnd(),cKey,cMask); %T[^D&9$,
bRegistered=FALSE; CCX8>09
} C{q :_M;
cMask=mask; F1Hh7
F
cKey=key; T1r3=Y4
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2"d!(J6}K
return bRegistered; ??i4z[0M
} TcGoSj<Z
W.1As{
四、小结 I6s3+x;O
f5GdZ_
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。