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:
Z%{`j!!p
3|Y.+W 一、实现方法
;%/}(&E2 ;0dl 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:
Jk`0yJi$q $B )jSxSy #pragma data_seg("shareddata")
GSGaYq HHOOK hHook =NULL; //钩子句柄
aqP"Y9l UINT nHookCount =0; //挂接的程序数目
6(B[(Af static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
>Qf`xUZ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
#%/0a static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
<@c9S,@t static int KeyCount =0;
Jb!s#g static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
@i>4k #pragma data_seg()
K pKZiUQm ZyrVv\' 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。
]%(X}]} _10I0Z0 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:
{UuSNZ[^ w!l*!G BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
%G,d&%f cKey,UCHAR cMask)
1VPxCB\ {
*)T7DN8 BOOL bAdded=FALSE;
hIo^/_K for(int index=0;index<MAX_KEY;index++){
J)^Kls\>t if(hCallWnd[index]==0){
g0s*4E hCallWnd[index]=hWnd;
E`q)vk HotKey[index]=cKey;
fTI~wF8! HotKeyMask[index]=cMask;
kI^Pu bAdded=TRUE;
ou\~^ KeyCount++;
kybDw{(}gc break;
jrO{A3<E }
{%v{iE> }
Mgux(5`; return bAdded;
z|m-nIM }
:w9s bW //删除热键
9d+z?J: BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E>1%7"
i< {
hhJ>>G4R2 BOOL bRemoved=FALSE;
(7|!%IO. for(int index=0;index<MAX_KEY;index++){
-aM7>YR if(hCallWnd[index]==hWnd){
\~:_h#bW if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
UmP\; hCallWnd[index]=NULL;
-pN'r/$3V HotKey[index]=0;
f!}e*oX HotKeyMask[index]=0;
MJcWX|(y bRemoved=TRUE;
?,UO$#Xm KeyCount--;
NvJ}|w,Z break;
ej]>*n }
'Fa~l'G7X }
cx+%lco! }
hx!hI1
return bRemoved;
aB~=WWLR\ }
g-2(W x3=SMN|a 7HQ|3rt DLL中的钩子函数如下:
K]>X31Ho kIH)>euZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
kO'NT: {
k mX:~KMb BOOL bProcessed=FALSE;
tZN'OoZ if(HC_ACTION==nCode)
]]V|]}<)m {
aq]bF%7 if((lParam&0xc0000000)==0xc0000000){// 有键松开
,M9Hdm switch(wParam)
&}b-aAt {
g:[yA{Eh case VK_MENU:
T3/Gl6f MaskBits&=~ALTBIT;
MMyJAGh
^G break;
8'VcaU7Nh case VK_CONTROL:
fTV3lyk MaskBits&=~CTRLBIT;
x4/f5 break;
-Z&9pI(3R~ case VK_SHIFT:
^r^) &] MaskBits&=~SHIFTBIT;
O`'r:W break;
-hP>;~*4 default: //judge the key and send message
;c0z6E / break;
w7Vl,pN, }
1|H(q for(int index=0;index<MAX_KEY;index++){
j<'ZO)q`Q if(hCallWnd[index]==NULL)
Bpdx]5qfK continue;
!WQ S.& if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gP>`DPgb^ {
f/%QMhM: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
nCdxn#| bProcessed=TRUE;
mI3
\n }
f VpE&F }
{h}e 9 }
5c6?$v/ else if((lParam&0xc000ffff)==1){ //有键按下
yxL(mt8 switch(wParam)
HpR(DG)
? {
hD>cxo case VK_MENU:
E9v_6d[ MaskBits|=ALTBIT;
F@kd[>/[ break;
VK]sK e case VK_CONTROL:
s92SN F}g MaskBits|=CTRLBIT;
0tp3mYd break;
+jGSD@32> case VK_SHIFT:
bv4G!21]*; MaskBits|=SHIFTBIT;
%j2ZQ/z break;
uxD$dd? default: //judge the key and send message
.a]9 rQQ&_ break;
6,Y<1b*|Vo }
VgcLG ]tE[ for(int index=0;index<MAX_KEY;index++){
<P1x3 if(hCallWnd[index]==NULL)
x10u?@ continue;
"'*w_H0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ggp. %kS6F {
J=AF`[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
?bH!|aW(H bProcessed=TRUE;
^mCKRWOP' }
|lVoL.Z,0 }
_*LgpZ-2( }
W60C$*h if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
-DE?L,9X9 for(int index=0;index<MAX_KEY;index++){
;n;bap if(hCallWnd[index]==NULL)
Eh/Z4pzT continue;
eaCh;IpIf if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
@_C?M5v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p2uZ*sY(D //lParam的意义可看MSDN中WM_KEYDOWN部分
pn-`QB:{h }
y-#01Z }
5BB:. }
b]xE^zM-I` return CallNextHookEx( hHook, nCode, wParam, lParam );
[mA\,ny9 }
y#)ad\ -5sKJt]+i 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
.%T.sQ p1B~F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
M5T4{^i BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Mib<1ZM {~+o+LV 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
C`r{B.t`GT
ZBl!7_[_ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
pkT26)aW {
\9T/%[r# if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
U6yZKK {
ud:5_* //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
VDy\2-b8d SaveBmp();
'fr~1pmx#3 return FALSE;
Eu1t*>ZL }
<X~P62< …… //其它处理及默认处理
\O(~:KN }
k{-#2Qz QeNN*@
='i _2E* 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
#/LU@+ +/4wioGm 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
9@yi
UX .p$tb2%r 二、编程步骤
vvmG46IgZ 6Us*zKgW 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";
U3b&/z|b? dxK3462 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
P1I L] :DoE_ 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;
RgTrj o%sx(g=q6 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;
'jj|bN xmNs<mz 5、 添加代码,编译运行程序。
e]q(fPK B`?}jJa9* 三、程序代码
)0N^rw kW #[ ?E, ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
d_aHUmI^" #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
$s"{C"4q #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
} za"rU #if _MSC_VER > 1000
Z|6,*XEc #pragma once
=Cg1I\ #endif // _MSC_VER > 1000
L wP #ifndef __AFXWIN_H__
K0C3s #error include 'stdafx.h' before including this file for PCH
x_$`#m{hL5 #endif
Zj5B}[,l\ #include "resource.h" // main symbols
\^]*T'>b class CHookApp : public CWinApp
?`T-A\A= {
GW\66$| public:
J`xCd/G CHookApp();
35/K9l5 // Overrides
"'v^X!" // ClassWizard generated virtual function overrides
T3,}CK#O //{{AFX_VIRTUAL(CHookApp)
W|4h;[w public:
28x:]5=jb virtual BOOL InitInstance();
+
[~)a4# virtual int ExitInstance();
fe8}2#<o //}}AFX_VIRTUAL
2 pmqP-pKd //{{AFX_MSG(CHookApp)
"xV0$% // NOTE - the ClassWizard will add and remove member functions here.
Y4Y~ep // DO NOT EDIT what you see in these blocks of generated code !
Nn='9s9F?} //}}AFX_MSG
nR`)kORc DECLARE_MESSAGE_MAP()
>vKOG@I };
B&>z&!} LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
(Qf. S{; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
nN5fP<H2x BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
o9]i
{e>L BOOL InitHotkey();
"< })X.t BOOL UnInit();
X;7hy0Y #endif
CWa~~h<r- B!1Bg9D //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
NE4 }!I #include "stdafx.h"
pj#l s #include "hook.h"
Z~1uyr( #include <windowsx.h>
4~i?xo=;v #ifdef _DEBUG
6<mlx' #define new DEBUG_NEW
E4,
J"T|@ #undef THIS_FILE
PWk\#dJN& static char THIS_FILE[] = __FILE__;
&M{;[O{ #endif
L%;[tu(* #define MAX_KEY 100
Fxv5kho #define CTRLBIT 0x04
W[<ZI>mf #define ALTBIT 0x02
3nnoXc' #define SHIFTBIT 0x01
0)rayzv #pragma data_seg("shareddata")
bYBE h n HHOOK hHook =NULL;
$Ts;o UINT nHookCount =0;
SZ1yy[" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
6_g:2=6S static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
X.+|o@G static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
5
BLAa1 static int KeyCount =0;
\>[k0< static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
b} FhC"'i #pragma data_seg()
%ty`Oa2 HINSTANCE hins;
M@+Pq/f: void VerifyWindow();
mI'&!@WG BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
.t7ME{ //{{AFX_MSG_MAP(CHookApp)
s
w{e | // NOTE - the ClassWizard will add and remove mapping macros here.
o[)*Y`xq<w // DO NOT EDIT what you see in these blocks of generated code!
qs!A)H# //}}AFX_MSG_MAP
i2+_~$f END_MESSAGE_MAP()
-G(#,rXk ]-;MY@ CHookApp::CHookApp()
spT$}F2n {
x;{Hd;<YF // TODO: add construction code here,
K5!OvqzG // Place all significant initialization in InitInstance
dngG= }
6bN8}\5 !<>*|a CHookApp theApp;
eZ BC@y LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
h@PE:= {
Ot`znJU@ BOOL bProcessed=FALSE;
jN-!1O._G if(HC_ACTION==nCode)
AQwai>eL {
|k^C- if((lParam&0xc0000000)==0xc0000000){// Key up
055C1RV% switch(wParam)
#I1q,fm {
>t{-_4Yv? case VK_MENU:
#>6Jsnv1 MaskBits&=~ALTBIT;
X0Wx\xDg[ break;
+ZOKfX case VK_CONTROL:
dhjX[7Bl9 MaskBits&=~CTRLBIT;
SY.ZEJcv break;
<nTZs`$LwL case VK_SHIFT:
Vh?RlIUA MaskBits&=~SHIFTBIT;
WPAT\Al&AE break;
/cT6X]o8 default: //judge the key and send message
nyetK break;
l <p(zLR }
,0c]/Sd*p for(int index=0;index<MAX_KEY;index++){
pu5%$}dBE if(hCallWnd[index]==NULL)
q@g#DP+C continue;
Dt!
< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(eAz
nTU {
~ #7@;C<nt SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0SQrz$y bProcessed=TRUE;
pHXs+Ysw+ }
P\WFm
}
?)T@qn+ }
@]!9;?so else if((lParam&0xc000ffff)==1){ //Key down
6_:I~TTX switch(wParam)
D|*yeS4> {
K|Eelhm case VK_MENU:
D5!#c-Y- MaskBits|=ALTBIT;
f `D(V-4 break;
70'gVCb case VK_CONTROL:
-y>~ :. MaskBits|=CTRLBIT;
<<b]v I break;
+#\7
#Y case VK_SHIFT:
ex
BLj
*] MaskBits|=SHIFTBIT;
4jSYR#Hqp` break;
W*%(J$E default: //judge the key and send message
]&N>F8.L+ break;
wX$|(Y} }
Zl>dBc% for(int index=0;index<MAX_KEY;index++)
f >.^7.is {
Q :.i[ if(hCallWnd[index]==NULL)
_a f $0! continue;
cUr!U\X[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
na|sKE;{ {
?4oP=. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
c/igw+L() bProcessed=TRUE;
7377g'jL }
8+J>jZ }
r6kJV4I=re }
DJ*mWi. if(!bProcessed){
"iR:KW@ for(int index=0;index<MAX_KEY;index++){
9ln=f= if(hCallWnd[index]==NULL)
q#@r*hl continue;
t|mK5aR4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
=H3tkMoi2 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
,@/O\fit) }
\m%c"'[ }
QM*
T?PR }
H>W8F2VT return CallNextHookEx( hHook, nCode, wParam, lParam );
fERO(o }
Xhq6l3 M DVVyWn[ BOOL InitHotkey()
;b:'i&r
{
5\=
y9Z- x if(hHook!=NULL){
N.H<'Q8& nHookCount++;
/&<V5?1| return TRUE;
O@4 J=P=w }
PR]b]= else
Wa7wV
9 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
SZyORN if(hHook!=NULL)
N#ZWW6 nHookCount++;
k}p8"'O return (hHook!=NULL);
r@m]#4 }
%B( rW?p& BOOL UnInit()
Uqb]&2 {
Dk>6PBl if(nHookCount>1){
ca,W:9#.xn nHookCount--;
IRwtM'%0 return TRUE;
-- FzRO{D }
JSi0-S[Y{ BOOL unhooked = UnhookWindowsHookEx(hHook);
k_!e5c if(unhooked==TRUE){
V.z8
]iG nHookCount=0;
wMj#.Jh hHook=NULL;
]ly" K!1, }
CGzu(@dd\ return unhooked;
9^ZtbmUf }
SJ<v< B atF#0*e> BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
yW(|auq {
S<-nlBs. BOOL bAdded=FALSE;
0#Lmajs for(int index=0;index<MAX_KEY;index++){
C l,vBjl h if(hCallWnd[index]==0){
R"9wVM;*c hCallWnd[index]=hWnd;
XL^05 HotKey[index]=cKey;
vXRY/Zzj1 HotKeyMask[index]=cMask;
KyfH8Na? bAdded=TRUE;
6o7t eX KeyCount++;
e).;;0 break;
[!yA#{xl, }
&e@)yVLL }
($kw*H{Ah^ return bAdded;
*<!q@r<d }
)S(Ly. [5& nH@og BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#MlpOk*G {
Y}v3J(l BOOL bRemoved=FALSE;
U31@++C[ for(int index=0;index<MAX_KEY;index++){
?KOw~-u if(hCallWnd[index]==hWnd){
BhzD V if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
l"%80"zO hCallWnd[index]=NULL;
iGu%_-S HotKey[index]=0;
Wz s=BNm9 HotKeyMask[index]=0;
flo$[]`.7 bRemoved=TRUE;
d_M+W@{ KeyCount--;
w\YS5!P,V break;
,d,2Q }
Xs2 jR14` }
w|-3X }
]5c(:T F return bRemoved;
%:d7Ts&?Z }
t+iHsCG)> ;//9,x9;t void VerifyWindow()
U:C:ugm {
*k}m?;esb for(int i=0;i<MAX_KEY;i++){
?nGi if if(hCallWnd
!=NULL){ MCmb/.&wu
if(!IsWindow(hCallWnd)){ xdm \[s
hCallWnd=NULL; {]<c6*gQ
HotKey=0; \agZD+
HotKeyMask=0; T5."3i
KeyCount--; 1.F&gP)9
} rBNVI;JZW
} 8ROKfPj;z
} p8_^6wfg
} ]*\MIz{56'
hj9TiH/+
BOOL CHookApp::InitInstance() Td|u@l4B
{ GQn:lu3j:
AFX_MANAGE_STATE(AfxGetStaticModuleState()); oNyYx6q:Q
hins=AfxGetInstanceHandle(); 3X`9&0:j%
InitHotkey(); v}6iI}r
return CWinApp::InitInstance(); )x7n-|y6
} 0bDc
4m
B5;%R01A
int CHookApp::ExitInstance() oT):#,s
{ M}x%'=Pox
VerifyWindow(); **Ioy+
UnInit(); hr
fF1
>A
return CWinApp::ExitInstance(); %S^hqC
} 05q760I+
);7
d_#
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,Gt!nm_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3!{imQT
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oQ<[`.s
#if _MSC_VER > 1000 FN-/~Su~J
#pragma once $u!(F]^
#endif // _MSC_VER > 1000 1+;bd'Ie
U`ttT5;
class CCaptureDlg : public CDialog !H\oQv-I
{ KFd
+7C9
// Construction 7Ed0BJTa
public: 112WryS
BOOL bTray; B>^6tdz
BOOL bRegistered; n[iwi
BOOL RegisterHotkey(); ^?`fN'!p
UCHAR cKey; Swhz\/u9
UCHAR cMask; 9j>2C
void DeleteIcon(); vn^O m-\
void AddIcon(); G<$:[ +w
UINT nCount; @-!P1]V|
void SaveBmp(); #:gd9os :
CCaptureDlg(CWnd* pParent = NULL); // standard constructor )=[\Yf K
// Dialog Data T(D6'm:X
//{{AFX_DATA(CCaptureDlg) @(sz "
enum { IDD = IDD_CAPTURE_DIALOG }; <eG| `
CComboBox m_Key; 1_]X
BOOL m_bControl; \%a0Lp{ I
BOOL m_bAlt; 89FAh6u E
BOOL m_bShift; Xxg|01
CString m_Path; V/ G1C^'/
CString m_Number; .KA-=$~J1
//}}AFX_DATA [`\VgKeu
// ClassWizard generated virtual function overrides AOR?2u
//{{AFX_VIRTUAL(CCaptureDlg) i<^X z
public: Y\]ZIvTSb
virtual BOOL PreTranslateMessage(MSG* pMsg); )}@D\(/@
protected: ~v;I>ij
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nHdQe
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Vke<; k-
//}}AFX_VIRTUAL *(OG+OkC
// Implementation IgX &aW
protected: +#FqC/`l
HICON m_hIcon; xaMDec V
// Generated message map functions f8:nKb>nq$
//{{AFX_MSG(CCaptureDlg) hJEd7{n
virtual BOOL OnInitDialog(); ka9@7IFM
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); gZ,h95'
afx_msg void OnPaint(); odhS0+d^
afx_msg HCURSOR OnQueryDragIcon(); Fc1!i8vv
virtual void OnCancel(); F/s
n"2
afx_msg void OnAbout(); w \b+OW
afx_msg void OnBrowse(); wXQxZuk[
afx_msg void OnChange(); JQ1MuE'
//}}AFX_MSG ]/=R ABi
DECLARE_MESSAGE_MAP() S0^a)#D &
}; 7S a9
#endif C
t,p
q5(t2nNb
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M&V'*.xz
#include "stdafx.h" xS,24{-HJ
#include "Capture.h" QRQZ{m
#include "CaptureDlg.h" )zr*Ecz
#include <windowsx.h> }(nT(9|
#pragma comment(lib,"hook.lib") #rkq
?:Q
#ifdef _DEBUG [H}>
2Q
#define new DEBUG_NEW |4df)
#undef THIS_FILE PILpWhjL$9
static char THIS_FILE[] = __FILE__; #f2Ot<#-
#endif ^K?-+
#define IDM_SHELL WM_USER+1 6gV*G
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7iP+!e}$.
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <YaT r9%w
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -5<[oBL;
class CAboutDlg : public CDialog |.N[NY
{ e(0OZ_ w
public: !Km[Qw
k-
CAboutDlg(); S^rf^%
// Dialog Data &<F9Z2^
//{{AFX_DATA(CAboutDlg) `B)@
enum { IDD = IDD_ABOUTBOX }; I&1Lm)W&
//}}AFX_DATA |7|S>h^
// ClassWizard generated virtual function overrides
=^4Z]d
//{{AFX_VIRTUAL(CAboutDlg) <s9{o
uZ
protected: 53i]Q;k [
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z?o8h
N\
//}}AFX_VIRTUAL E5ce=$o
// Implementation l f>/
protected: N'`X:7fN
//{{AFX_MSG(CAboutDlg) xKUL}>8
//}}AFX_MSG P<PZ4hNx
DECLARE_MESSAGE_MAP() [dJ!JT/X{
}; P 45Irir
K<>kT4
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 25SWIpgG
{ HRf;bKZ
//{{AFX_DATA_INIT(CAboutDlg) >#]A2,
//}}AFX_DATA_INIT b80#75Bj>
} 0kE[=#'.'
meX2Y;
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z<%P"
{ $[|(&8+7
CDialog::DoDataExchange(pDX); P 9?cp{*
//{{AFX_DATA_MAP(CAboutDlg) OC=&!<
//}}AFX_DATA_MAP '(vZfzc{J
} *[si!e%
\L Q+
n+
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2K}49*
//{{AFX_MSG_MAP(CAboutDlg) :q9!
// No message handlers <],{at` v
//}}AFX_MSG_MAP $k~TVm
Yex
END_MESSAGE_MAP() !T0I; j&
}A3/(
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6v)TCj/
: CDialog(CCaptureDlg::IDD, pParent) v=llg ^
{ Z[?n{vD7
//{{AFX_DATA_INIT(CCaptureDlg) s$M(-"mg
m_bControl = FALSE; /!5Wd(:
m_bAlt = FALSE; B>2R-pa4~
m_bShift = FALSE; 5u$.!l8Nl
m_Path = _T("c:\\"); 6`e{l+c=F
m_Number = _T("0 picture captured."); b| L;*<KU
nCount=0;
)-2Nc7
bRegistered=FALSE; xi (@\A
bTray=FALSE; B;9,Qbb
//}}AFX_DATA_INIT OUBGbld
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4"P9z}y=i
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e9LX0=
} si0}b~t
tq
L(H25z
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) x3O%W?5
{ #
-'A
=j
CDialog::DoDataExchange(pDX); #NM)
//{{AFX_DATA_MAP(CCaptureDlg) a#p+.)Wm
DDX_Control(pDX, IDC_KEY, m_Key); e;.,x 5+
DDX_Check(pDX, IDC_CONTROL, m_bControl); *;A ;)'
DDX_Check(pDX, IDC_ALT, m_bAlt); 07 LyB\l~
DDX_Check(pDX, IDC_SHIFT, m_bShift); dseI~}
DDX_Text(pDX, IDC_PATH, m_Path); E+L7[
DDX_Text(pDX, IDC_NUMBER, m_Number); 0%f}Q7*R
//}}AFX_DATA_MAP V(S7mA:T
} aT0~C.vT
k(ouE|B
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _U~R
//{{AFX_MSG_MAP(CCaptureDlg) %2 r~
ON_WM_SYSCOMMAND() '?rR>$s
ON_WM_PAINT() XM]m%I
ON_WM_QUERYDRAGICON() t&U9Z$LS
ON_BN_CLICKED(ID_ABOUT, OnAbout) d.&_j`\F
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T<]{:\*n
ON_BN_CLICKED(ID_CHANGE, OnChange) lNe4e6
//}}AFX_MSG_MAP wv\X
END_MESSAGE_MAP() E1QJ^]MG.
LW1 4 'A}
BOOL CCaptureDlg::OnInitDialog() !u7KgB<=/F
{ !9d7wPUFr
CDialog::OnInitDialog(); D6ZHvY8R
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); MdBmq/[O
ASSERT(IDM_ABOUTBOX < 0xF000); VzG|Xtco[
CMenu* pSysMenu = GetSystemMenu(FALSE); O,%UNjx9K
if (pSysMenu != NULL) mE~WE+lw9
{ MIJuJ]U}
CString strAboutMenu; dk&F?B{6T
strAboutMenu.LoadString(IDS_ABOUTBOX); v H HgZ
if (!strAboutMenu.IsEmpty()) >iTmILA
{ er3Mvw
pSysMenu->AppendMenu(MF_SEPARATOR); 6))":<J
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); xw*e`9vAe
} 9^*RK6
} %H\b5&
_y
SetIcon(m_hIcon, TRUE); // Set big icon R0?bcP&
SetIcon(m_hIcon, FALSE); // Set small icon uda++^y:
m_Key.SetCurSel(0); Cd'D
~'=
RegisterHotkey(); _ZRmD\_t
CMenu* pMenu=GetSystemMenu(FALSE); kff N0(MR
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #S7oW@
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >LPb>t5%p
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Fyvo;1a
return TRUE; // return TRUE unless you set the focus to a control - (s0f
} *f+s
;+75"=[YT
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) JA^!i98{
{ 9a_P 9s3w
if ((nID & 0xFFF0) == IDM_ABOUTBOX) QQAEG#.5
{ 5*z>ez2YQ7
CAboutDlg dlgAbout; W ^<AUT
dlgAbout.DoModal(); U5"u
h} 3
} "kApGNB
else 8u*<GbKGI
{ z83v
J*.
CDialog::OnSysCommand(nID, lParam); a?gF;AYk
} ~gX1n9_n
} uyX
%&r
}Y-V!z5z!
void CCaptureDlg::OnPaint() s#7"ZN
{ #IH9S5B [
if (IsIconic()) NDRDP D
{ OP!R>|
CPaintDC dc(this); // device context for painting 99OZK
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *<\`"C;
// Center icon in client rectangle 89d%P
J0
int cxIcon = GetSystemMetrics(SM_CXICON); xh;gAh5n
int cyIcon = GetSystemMetrics(SM_CYICON); W'6DwV|
CRect rect; !oyo_h
GetClientRect(&rect); 0Y oKSo
int x = (rect.Width() - cxIcon + 1) / 2; v7(7WfqP
int y = (rect.Height() - cyIcon + 1) / 2; ;Tbo \Wp9
// Draw the icon ]]p\1G
dc.DrawIcon(x, y, m_hIcon); B~:yM1f@u4
} 4j3q69TZR
else 'bbw0aB4
{ bg~CV&]M
CDialog::OnPaint(); hP:>!KJ
} u-~ec{oBu
} HD<$0M|
.]>Tj^1
HCURSOR CCaptureDlg::OnQueryDragIcon() 7#JnQ|
]
{ #JYl%=#,
return (HCURSOR) m_hIcon; ]j0+4w
} {^oohW -
"e-z2G@z
void CCaptureDlg::OnCancel() knO
X5UnS
{ gb,ZN^3<-
if(bTray) ltOS()[X
DeleteIcon(); g:uVl;>
CDialog::OnCancel(); J *LPv9)
} L\mF[Kd#+T
?EUg B\
void CCaptureDlg::OnAbout() La6
9or
{ <HnJD/g
CAboutDlg dlg; 0^*,E/}P&
dlg.DoModal(); ">T\]V$R
} -+ F,L8
&/m^}x/_W
void CCaptureDlg::OnBrowse() !=S?*E +j)
{ o"Xv)#g&
CString str; ^m7y=CJM
BROWSEINFO bi; 4lPO*:/
char name[MAX_PATH]; ln_&Ux+l
ZeroMemory(&bi,sizeof(BROWSEINFO)); <Ve0Ph K
bi.hwndOwner=GetSafeHwnd(); /@
emE0
bi.pszDisplayName=name; W(s5mX,Kv
bi.lpszTitle="Select folder"; >!5RY8+
bi.ulFlags=BIF_RETURNONLYFSDIRS; @Yt394gA%\
LPITEMIDLIST idl=SHBrowseForFolder(&bi); I{w(`[Nxw*
if(idl==NULL) bR3Crz(9G
return; i).Vu}W#S
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MO0t
str.ReleaseBuffer(); ((Av3{05H&
m_Path=str; ta95]|z"j
if(str.GetAt(str.GetLength()-1)!='\\') 8i$|j~M a
m_Path+="\\"; l!gX-U%-
UpdateData(FALSE); (P E.v1T
} a;5clonB
`BZ|[
q3
void CCaptureDlg::SaveBmp() *& w/*h$!
{ pk u\)
CDC dc; iUz?mt;k
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1E$\&*(
CBitmap bm; 9'(^Coq
int Width=GetSystemMetrics(SM_CXSCREEN); b
B#QIXY/L
int Height=GetSystemMetrics(SM_CYSCREEN); G#Bm">+
bm.CreateCompatibleBitmap(&dc,Width,Height); :YLs]JI<
CDC tdc; ,$!F,c
tdc.CreateCompatibleDC(&dc); M2V`|19Q
CBitmap*pOld=tdc.SelectObject(&bm); <f
(z\pi1
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); xw{K,;WeO
tdc.SelectObject(pOld); NEIF1(:
BITMAP btm; @=G[mc\
bm.GetBitmap(&btm); 3` IR
^
DWORD size=btm.bmWidthBytes*btm.bmHeight; !hJ!ck]M
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7/M[T\c
BITMAPINFOHEADER bih; /w?zO,!
bih.biBitCount=btm.bmBitsPixel; KHP/Y{mH
bih.biClrImportant=0; !L+b{
bih.biClrUsed=0; ~_0XG0oA
bih.biCompression=0; 2iKteJ@h)
bih.biHeight=btm.bmHeight; E6R\DM
bih.biPlanes=1; kJ%a;p`O
bih.biSize=sizeof(BITMAPINFOHEADER); 4,@jSr|I3i
bih.biSizeImage=size; pj7al;
bih.biWidth=btm.bmWidth; +PBl3
bih.biXPelsPerMeter=0; p+ReQ.5|
bih.biYPelsPerMeter=0; HJb^l 4Q
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !d 4DTo
static int filecount=0; ^KD1dy3(
CString name; x
[vbi
name.Format("pict%04d.bmp",filecount++);
n?c[ E+i;
name=m_Path+name; #"oLz"{
BITMAPFILEHEADER bfh; pFs/ipZX^*
bfh.bfReserved1=bfh.bfReserved2=0; ,2 xD>+=
bfh.bfType=((WORD)('M'<< 8)|'B'); t"9r`0>
bfh.bfSize=54+size; +9]t]Vrw
bfh.bfOffBits=54; i{9.bpp/
CFile bf; Hxy=J
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ tSni[,4Kq
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [c;0eFSi2
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 63'%+
bf.WriteHuge(lpData,size); cjtcEW
bf.Close(); 1Z?uT[kR
nCount++; oNYFbZw
} Vo[.^0
GlobalFreePtr(lpData); cSv;HN:
if(nCount==1) E3{kH
7_'\
m_Number.Format("%d picture captured.",nCount); Vug[q=i
else 'I}wN5`
m_Number.Format("%d pictures captured.",nCount); @/N]_2@8;
UpdateData(FALSE); 14l6|a
}
n gJ{az
]):>9q$C
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 'Hj([N
{ fg,vTpBk
if(pMsg -> message == WM_KEYDOWN) <}.!G>X
{ 45BpZ~-
if(pMsg -> wParam == VK_ESCAPE) +_ 8BJ
return TRUE; {|0YcL
if(pMsg -> wParam == VK_RETURN) 9*~";{O.Oa
return TRUE; *yHz#u'
} R4 b!?}d
return CDialog::PreTranslateMessage(pMsg); *Cp:<Mnd
} f fI=Bt]t
d%L/[.&
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2zbn8tO
{ J!|R1
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ InRRcn(
SaveBmp(); M%$ITE
return FALSE; h'GOO(
} uwi.Sg11
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4Q1R:Ra
CMenu pop; ,ExY.'%1
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1));
0,&] 2YJ
CMenu*pMenu=pop.GetSubMenu(0); zgGJ<=G.
pMenu->SetDefaultItem(ID_EXITICON); !K2QD[x
CPoint pt; Piw i
GetCursorPos(&pt); O` !XW8
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ml)\R L
if(id==ID_EXITICON) #N|JC d_
DeleteIcon(); ,y-!h@(
else if(id==ID_EXIT) ?
47"$=G
OnCancel(); '
Qlj"U
return FALSE; V@y&n1?6
} (+xT5 2
LRESULT res= CDialog::WindowProc(message, wParam, lParam); mBB"e"o
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B@ z ng2[
AddIcon(); :)4c_51 `
return res; Z:<wB#G
} n``9H91
Z<=L
void CCaptureDlg::AddIcon() ugj I$u
{ 2[1t
)EW
NOTIFYICONDATA data; ]
X)~D!mA
data.cbSize=sizeof(NOTIFYICONDATA); u^Ktz
DmL
CString tip; WAtv4
tip.LoadString(IDS_ICONTIP); 3A =\Mb
data.hIcon=GetIcon(0); .h/2-pQ>
data.hWnd=GetSafeHwnd(); owyQFk
strcpy(data.szTip,tip); lqO>Q1_{K
data.uCallbackMessage=IDM_SHELL; A@Zqh<,Ud
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; M+j*5wNy
data.uID=98; 8N |K
Shell_NotifyIcon(NIM_ADD,&data);
JJs*2y
ShowWindow(SW_HIDE); egr"og{
bTray=TRUE; ?|_i"*]l
} oLq N
'6g-]rE[
void CCaptureDlg::DeleteIcon() M$!-B,1BX
{ {KK/mAp{
NOTIFYICONDATA data; {:\LFB_
data.cbSize=sizeof(NOTIFYICONDATA); rf`xY4I\
data.hWnd=GetSafeHwnd(); RFSwX*!
data.uID=98; j,
*=D6
Shell_NotifyIcon(NIM_DELETE,&data); +~P_o_M
ShowWindow(SW_SHOW); ~>_UTI
SetForegroundWindow(); Brd9"M|d
ShowWindow(SW_SHOWNORMAL); PRBlf
bTray=FALSE; =w:)AWZ
} o9C#5%9
+M#}(hK
void CCaptureDlg::OnChange() A@:U|)+4
{ Nq6;
z)$
RegisterHotkey(); !I&,!$
} i6P$>8jBQ-
3xdJ<Lrq
BOOL CCaptureDlg::RegisterHotkey() '.gi@Sr5
{ pp{p4Z
UpdateData(); V[Sj+&e&
UCHAR mask=0; a2]ZYY`R7
UCHAR key=0; %] :ZAmN
if(m_bControl) _7qa~7?f
mask|=4; RE D@|[Qh
if(m_bAlt) YdIZikF#
mask|=2; 19[!9ci
if(m_bShift) +%WW8OX
mask|=1; j/NX
key=Key_Table[m_Key.GetCurSel()]; p&4n"hC
if(bRegistered){ <5#2^ (
DeleteHotkey(GetSafeHwnd(),cKey,cMask); nz#eJ
bRegistered=FALSE; *XYp~b
} darbL_1
cMask=mask; w8:
cKey=key; 5'V-Ly)*%
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \MdieO*
return bRegistered; Eht8~"fj
} ][#|5UK8L
.RAyi>\e
四、小结 H;q[$EUNb
]n"U])pJd
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。