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:
@HY P_hR
q AsTiT6r 一、实现方法
C?<[oQb# f'tQLF[r< 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:
Z}IuR|= a4]=4[(iu> #pragma data_seg("shareddata")
Y$fF"pG? HHOOK hHook =NULL; //钩子句柄
{+gK\Nz UINT nHookCount =0; //挂接的程序数目
)Q<u0AxAn static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
%wGQu;re static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
"b"|ay static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
%+(fdk-k+ static int KeyCount =0;
L9l]0C37e static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
&O5&pet #pragma data_seg()
fAR6 oJc7az 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
rT;_"y}
=A_{U(> DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
7p{2&YhB KPZqPtb; BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
VK|$SY( cKey,UCHAR cMask)
LX(`@-<DH {
20M]gw] BOOL bAdded=FALSE;
aq9Ej]1b for(int index=0;index<MAX_KEY;index++){
kZc Ge* if(hCallWnd[index]==0){
`0=j,54cx hCallWnd[index]=hWnd;
N*KM6j HotKey[index]=cKey;
/1hcw|cfC HotKeyMask[index]=cMask;
BtQqUk#L2 bAdded=TRUE;
*N](Xtbj KeyCount++;
Xa$tW%) break;
Lp+?5DjLT }
oP:OurX8V }
J$(79gH{ return bAdded;
+('=RyoT }
J|8 u //删除热键
g{hbq[>X] BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
D&6.> wt
. {
"&\]1A}Z-x BOOL bRemoved=FALSE;
{!pYQ|# for(int index=0;index<MAX_KEY;index++){
y)7;"3Q< if(hCallWnd[index]==hWnd){
= d !YM6G if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
BbgKaC q hCallWnd[index]=NULL;
.]; ` HotKey[index]=0;
|jKFk.M HotKeyMask[index]=0;
2p*L~! iM bRemoved=TRUE;
n,p \~Tu, KeyCount--;
U.ew6`'Te break;
hgdr\
F }
?~; q r }
|e2s{J2 }
fh&Q(:ZU return bRemoved;
C1-Jj_XQ. }
nd h\+7 u}jC$T>2%6 |+1k7S, DLL中的钩子函数如下:
I.1(qbPkF+ &qm:36Y7Xg LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Eq5X/Hx {
%,udZyO3uR BOOL bProcessed=FALSE;
}jL4F$wC if(HC_ACTION==nCode)
&Z+.FTo {
NDG?Xs [2 if((lParam&0xc0000000)==0xc0000000){// 有键松开
djDE0-QxcR switch(wParam)
g7K<"Z {M {
jZ?^ |1 case VK_MENU:
UFj/Y; MaskBits&=~ALTBIT;
tSiQrI break;
?1H>k<Jp case VK_CONTROL:
jG,^~5x MaskBits&=~CTRLBIT;
VWMr\]g break;
VS+5{w:t case VK_SHIFT:
s)9sbJ MaskBits&=~SHIFTBIT;
:(4];Va break;
i6k~j%0m default: //judge the key and send message
E{'\(6z_ break;
lH>6;sE }
C+-sf for(int index=0;index<MAX_KEY;index++){
q94*2@KV if(hCallWnd[index]==NULL)
n:JG+1I continue;
i]0$7s9! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
wtfM}MW\ {
D!bi>]Yd SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
<-!'V,c bProcessed=TRUE;
N||s# }
[Ib17#74 }
z_:r&UP`" }
0Pg@%>yb~ else if((lParam&0xc000ffff)==1){ //有键按下
n:%A4* switch(wParam)
!jN$U%/,%. {
AKAxfnaR case VK_MENU:
Jv D`RUh MaskBits|=ALTBIT;
Cx8
H break;
/O$)m[ case VK_CONTROL:
Le,+jm MaskBits|=CTRLBIT;
#s-li b break;
*
Vymb case VK_SHIFT:
&-ZRS/_d> MaskBits|=SHIFTBIT;
PML84*K - break;
;}AcyVV default: //judge the key and send message
2spK#0n.HV break;
mC EWp }
CdiL{zH\3 for(int index=0;index<MAX_KEY;index++){
21\?FQrz if(hCallWnd[index]==NULL)
)H1chNI) continue;
x_x|D|@wM if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9q"G g? {
O9)k)A]`O SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
*9}~?#b bProcessed=TRUE;
Ky'\t7p u }
7x`4P|Uu }
,+RoJwi m }
2$oGy if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
CIf""gL9 for(int index=0;index<MAX_KEY;index++){
Xd9<`gu if(hCallWnd[index]==NULL)
s_`y"'^ continue;
KnYHjJa if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
z';h5GNd>z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$dHD //lParam的意义可看MSDN中WM_KEYDOWN部分
uszMzO~ }
,9/s`o }
^s?i&K,! }
{>.qo<k return CallNextHookEx( hHook, nCode, wParam, lParam );
XOJ@-^BX }
Rj,M|9Y)o r7N%onx 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:
#>qA&*+{n ,NQ>,}a0 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
x:IY6 l BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
u2Qs}FX IR*:i{ 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:
xqaw00,s +4Lj}8, LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
p:8]jD@}% {
)1]LoEdm` if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
h3kBNBI ) {
=|bW >y //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
$a+)v#?, SaveBmp();
x8*@<]! return FALSE;
& A @!g }
.s<tQU …… //其它处理及默认处理
74*iF'f?c }
"_/5{Nc$ hdee]qLS BGVy
\F< 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。
&8 4Izs/[ [{9&KjI0K 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。
{m<!-B95 @GE:<'_:{ 二、编程步骤
cOEzS FI(M 1iJ 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";
}sS1p6z WnC0T5S?U 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
GE.@*W U*em)/9 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;
Voc&T+A m &0S/]E`_M 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;
-qRO}EF +)K yG 5、 添加代码,编译运行程序。
1Du9N[2'P b1qli5 三、程序代码
jRIm_) >@U
lhJtW ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
4WV)&50 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
S~ 3| #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
)Z2t=&Nw #if _MSC_VER > 1000
j\8'P9~% #pragma once
-2Azpeh #endif // _MSC_VER > 1000
g ed k #ifndef __AFXWIN_H__
%uLyL4*L(p #error include 'stdafx.h' before including this file for PCH
9CTvG zkw #endif
$U/_8^6B0 #include "resource.h" // main symbols
4lfJc9J class CHookApp : public CWinApp
},LW@Z} {
K1>(Fs$ public:
k|T0Bly3P CHookApp();
kXbdR // Overrides
abM4G // ClassWizard generated virtual function overrides
Y_<(~eN` //{{AFX_VIRTUAL(CHookApp)
)z?Kq0 public:
\M`fkR,,' virtual BOOL InitInstance();
@3b|jJyf virtual int ExitInstance();
>qI|g={M //}}AFX_VIRTUAL
C\dlQQ //{{AFX_MSG(CHookApp)
F
/:2+ // NOTE - the ClassWizard will add and remove member functions here.
>#\&%0OZw // DO NOT EDIT what you see in these blocks of generated code !
2nPU $\du //}}AFX_MSG
h/%Hk;|9 DECLARE_MESSAGE_MAP()
\4`2k };
; i><03 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
emI]'{_G BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
7eg//mL"6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
L&nGjC+Lr BOOL InitHotkey();
VCvqiHn BOOL UnInit();
oWUDTio#[ #endif
RycO8z*p 8; s$?*Gi //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
XOy#?X/` #include "stdafx.h"
bz?
*#S #include "hook.h"
d.&~n`Rv!p #include <windowsx.h>
O}3M+ #ifdef _DEBUG
%7?v='s= #define new DEBUG_NEW
OAQ'/{~7 #undef THIS_FILE
{L8(5 static char THIS_FILE[] = __FILE__;
vv,(ta@t2 #endif
}`9}Q
O #define MAX_KEY 100
r8~U@$BBK #define CTRLBIT 0x04
2O5yS #define ALTBIT 0x02
{9Op{bZ #define SHIFTBIT 0x01
:I }_ #pragma data_seg("shareddata")
%R{clbbbn HHOOK hHook =NULL;
-h8!O+7 . UINT nHookCount =0;
}?Y+GT"E static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
BE}qwP^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
lA<IcW static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
8Q1){M9' static int KeyCount =0;
:8aIj_qds static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
K9*#H( #pragma data_seg()
^ffh HINSTANCE hins;
y|X\f! void VerifyWindow();
9D_4]'KG BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
#+eV5%Si //{{AFX_MSG_MAP(CHookApp)
S-h1p` // NOTE - the ClassWizard will add and remove mapping macros here.
ud-.R~f{e // DO NOT EDIT what you see in these blocks of generated code!
1q!6Sny@ //}}AFX_MSG_MAP
{hM*h(W~3 END_MESSAGE_MAP()
7c6-S@L R@0ELxzA CHookApp::CHookApp()
QE5
85s5
{
E}qeh"sJt // TODO: add construction code here,
pz^"~0o5 // Place all significant initialization in InitInstance
viBf". }
2Xgw7`
!L >}/"gx CHookApp theApp;
+*
)Qi) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
8X]j;Rb {
z@ A5t4+3 BOOL bProcessed=FALSE;
q6{ %vd if(HC_ACTION==nCode)
1p&?MxLN-a {
<96ih$5D1 if((lParam&0xc0000000)==0xc0000000){// Key up
l(zkMR$b8 switch(wParam)
9ffRY,1@ {
nx,67u/Pb case VK_MENU:
^\mN<z( MaskBits&=~ALTBIT;
>|7&hj$ break;
zT~ GBC-IX case VK_CONTROL:
bah5 f MaskBits&=~CTRLBIT;
Pwz^{*u] break;
j&Ayk* case VK_SHIFT:
i4!n Oyk MaskBits&=~SHIFTBIT;
^B?koU l^ break;
s$:]$&5 default: //judge the key and send message
J\
break;
hv
.Mf.m }
yZFvpw|g for(int index=0;index<MAX_KEY;index++){
tQJ@//C\z if(hCallWnd[index]==NULL)
ASy7")5 continue;
VkhK2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z/uRz]Hi {
4'9h^C& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
uD:O[H-x bProcessed=TRUE;
/IV:JVT }
Q:VD2<2 }
,bmTBZV }
a$t [}D2 else if((lParam&0xc000ffff)==1){ //Key down
nhXa&Nro switch(wParam)
rmQGzQnun {
4b3p,$BWS case VK_MENU:
<k^9l6@ MaskBits|=ALTBIT;
(DKpJCx break;
o
ohf)) case VK_CONTROL:
+bf%]
MaskBits|=CTRLBIT;
|klL KX& break;
6nGDoW# case VK_SHIFT:
rzaEVXbz1 MaskBits|=SHIFTBIT;
! 2Y,
a break;
l/rhA6kEU default: //judge the key and send message
-R7f/a8 break;
R?|_`@@A }
[EGE| for(int index=0;index<MAX_KEY;index++)
$X*$,CCIB {
//Tr=!TQu if(hCallWnd[index]==NULL)
Bdbw!zRR$ continue;
}>frK#S if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Z^GriL {
A7b7IM [ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
)cs
y^-qw bProcessed=TRUE;
QTn-n)AE }
~Nc]`95 }
J?%D4AeS]v }
^<|If:| if(!bProcessed){
bR&hI9`%F for(int index=0;index<MAX_KEY;index++){
\HK#d1>ox if(hCallWnd[index]==NULL)
:f/ p5c continue;
U-n33ty`H if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ax>c&%vo SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
s.GhquFCrU }
'{oe}]., }
4qm5`o\hb }
eEc;w# return CallNextHookEx( hHook, nCode, wParam, lParam );
p Y>yJ) }
Ca1)>1Vz (J^
Tss BOOL InitHotkey()
o!\O) {
A<.Q&4jb if(hHook!=NULL){
#sqDZ]\B nHookCount++;
M;43F* return TRUE;
*=|i" }
^~`8 - TE else
Cq(Xa- hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Y6D=tb if(hHook!=NULL)
<&L;9fr nHookCount++;
=v;-{oN! return (hHook!=NULL);
\GvVs }
BgpJ;D+N4 BOOL UnInit()
Bgs~1E @8V {
WX\%FJ if(nHookCount>1){
#JLDj(a? nHookCount--;
U<6k!Y9ny return TRUE;
lP9I\Ge& }
R<U?)8g,h~ BOOL unhooked = UnhookWindowsHookEx(hHook);
2bxT%xH:g if(unhooked==TRUE){
~y|%D; nHookCount=0;
A|>C3S hHook=NULL;
~AE034_N }
EhD|\WLx! return unhooked;
yh0|f94m }
%*19S.=l }zobIfIF BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pKH4?F {
\
qs6% BOOL bAdded=FALSE;
H|TzD"2N for(int index=0;index<MAX_KEY;index++){
Bw#ubQJ8} if(hCallWnd[index]==0){
#63/;o:l$ hCallWnd[index]=hWnd;
{X =\ HotKey[index]=cKey;
l.34h HotKeyMask[index]=cMask;
_$bx4a bAdded=TRUE;
Z?X$8o^Z KeyCount++;
)>Lsj1qk break;
{!/y@/NK2 }
D1j7iv }
OUdeQO? return bAdded;
G1nW{vce }
iZSSd{jO XsG]-Cw BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
CMg83 {
xLD6A5n,[ BOOL bRemoved=FALSE;
KOmP-q=6 for(int index=0;index<MAX_KEY;index++){
,X$Avdc2 if(hCallWnd[index]==hWnd){
6Ss{+MF|v if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Gz6GU.IyQy hCallWnd[index]=NULL;
{//F>5~[ HotKey[index]=0;
8uGPyH HotKeyMask[index]=0;
Ffxk] o&%c bRemoved=TRUE;
LNN:GD)> KeyCount--;
oOL3O@)w> break;
Z~,.l
}
pS<b|wu?f }
$3[cBX.= }
#y*=UV|h return bRemoved;
K?;p: }
'0O[ dN L$Leo6<3a void VerifyWindow()
]8_h9ziz {
H3c=B /+ for(int i=0;i<MAX_KEY;i++){
w7Pe<vT if(hCallWnd
!=NULL){ 3H%HJS
if(!IsWindow(hCallWnd)){ *3ne(c
hCallWnd=NULL; hZ'oCRM
HotKey=0; dikWk
HotKeyMask=0; Vd/S81/
KeyCount--; 6_y|4!,:W
} 3'"M31iA
} v\Wm[Ld
} y[zA[H:
} {4QOUqA u
<{U{pCT%
BOOL CHookApp::InitInstance() Fm;)7.%
>
{ @\DD|o67
AFX_MANAGE_STATE(AfxGetStaticModuleState()); kdUGmR0d
hins=AfxGetInstanceHandle(); hKTg~y^
InitHotkey(); > 4ct[fW+
return CWinApp::InitInstance(); Ds
G
*
} `Of wl%G
>#:/
GN?
int CHookApp::ExitInstance() PD}R7[".>
{ _RW[]MN3*
VerifyWindow(); psZeu*/r
UnInit(); bF KPV%`
return CWinApp::ExitInstance(); {\aSEE/'
} @|GeR
jSFN/C.9h
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 46zaxcY<!
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {IMzR'PN
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0lRH
Yu
#if _MSC_VER > 1000 Z8&C-yCC
#pragma once w}.'Tebu
#endif // _MSC_VER > 1000 [Kj:~~`T
0v@/I<
class CCaptureDlg : public CDialog AIm$in`P
{ jOb[h=B"
// Construction &
.?HuK
public: ]hj1.V+
BOOL bTray; @:7gHRJ!
BOOL bRegistered; ?&"^\p
BOOL RegisterHotkey(); }x.)gW
UCHAR cKey; aVP|:OAj
UCHAR cMask; >jX
UO
void DeleteIcon(); Hk]BC
void AddIcon(); tqQ0lv^J
UINT nCount; <c ovApx
void SaveBmp(); ~}5Ml_J$,l
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 30_un
// Dialog Data MA+-2pMc|7
//{{AFX_DATA(CCaptureDlg) ^-IsK#r.k
enum { IDD = IDD_CAPTURE_DIALOG }; ^2r}_AX
CComboBox m_Key; >fye^Tx
BOOL m_bControl; l;BX\S
BOOL m_bAlt; Nr"N\yOA/
BOOL m_bShift; -m160k3
CString m_Path; |)qK
g
CString m_Number; kP)o=\|W{z
//}}AFX_DATA ~RXpz-Ye
// ClassWizard generated virtual function overrides 'Y[A'.*}4
//{{AFX_VIRTUAL(CCaptureDlg) p??/r
public: O|Ic[XfLx
virtual BOOL PreTranslateMessage(MSG* pMsg); C|f7L>qe
protected: "rGOw'!q>
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y<`?@(0$
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q.MVF]
//}}AFX_VIRTUAL A'(7VJ
// Implementation r%l%yCH
protected: mY`]33??v
HICON m_hIcon; HqdJdWl#"
// Generated message map functions {(OIu]:
//{{AFX_MSG(CCaptureDlg) %%~}Lw
virtual BOOL OnInitDialog(); 4$aO;Z_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); sJb)HQ,7x
afx_msg void OnPaint(); Y_@"v#,
afx_msg HCURSOR OnQueryDragIcon(); [tqO}D
virtual void OnCancel(); jRG\C=&(x
afx_msg void OnAbout(); $W$# CTM
afx_msg void OnBrowse(); ZB[(Tv1
afx_msg void OnChange(); T@|l@xm~L
//}}AFX_MSG +oy&OKCa
DECLARE_MESSAGE_MAP() |WAD $3
}; P;[Y42\z|
#endif Blbq3y+Sq
]1?=jlUl
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3l%,D:
?
#include "stdafx.h" M{xVkXc>
#include "Capture.h" @vQa\|j
#include "CaptureDlg.h" GzFE%< 9F
#include <windowsx.h> V-_/(xt*
#pragma comment(lib,"hook.lib") Hl3)R*&'J
#ifdef _DEBUG 3u*hTT
#define new DEBUG_NEW UQ3@@:L_
#undef THIS_FILE kwHqvO!G
static char THIS_FILE[] = __FILE__; VkpHzr[k
#endif b(RBG
#define IDM_SHELL WM_USER+1 Mi}I0yhVm
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rQEi/
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :wU_-{>>2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *v
rWA
class CAboutDlg : public CDialog !\0F.*
{ fYhR#FVI
public: poD\C;o"
CAboutDlg(); ,?k%jcR
// Dialog Data 5#0e={X
//{{AFX_DATA(CAboutDlg) ]G0dS
Fh{j
enum { IDD = IDD_ABOUTBOX }; '_qQrP#
//}}AFX_DATA rKzlK 'U
// ClassWizard generated virtual function overrides P>Q{He:
//{{AFX_VIRTUAL(CAboutDlg) 85D^@{
protected: q[G/}
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #%^\\|'z
//}}AFX_VIRTUAL =4zNo3IvL+
// Implementation vJRnBq+y
protected: W7L+8LU;
//{{AFX_MSG(CAboutDlg) mP pvZ
//}}AFX_MSG @H\pipT_b
DECLARE_MESSAGE_MAP() H#L#2M%
}; IyS"
uxOJ3
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K 3Yw8t2J
{ yW\XNX
//{{AFX_DATA_INIT(CAboutDlg) URK!W?3c
//}}AFX_DATA_INIT rLJ[FqS
} &$qF4B*
+2DE/wE]e+
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BWUt{,?KU
{ j1YH9T#|D
CDialog::DoDataExchange(pDX); a@#Q:O)4
//{{AFX_DATA_MAP(CAboutDlg) ]U,CKJF%/
//}}AFX_DATA_MAP x_==Ss
} )nwZ/&@
qL|
5-(P
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) AJyq>0p
//{{AFX_MSG_MAP(CAboutDlg) aDL)|>"Q
// No message handlers [$l"-*s4
//}}AFX_MSG_MAP TZ_rsj/t
END_MESSAGE_MAP() x(PKFn
k6Ihc?HL
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gYatsFyL
: CDialog(CCaptureDlg::IDD, pParent) hH%,!tSx
{ -J,Q;tj
//{{AFX_DATA_INIT(CCaptureDlg) 7DtIVMiK
m_bControl = FALSE; <%z@
m_bAlt = FALSE; 1E8H%2$ V
m_bShift = FALSE; S_!hsY
m_Path = _T("c:\\"); 99e*]')A%
m_Number = _T("0 picture captured."); XFW5AP
nCount=0; 4'SaEsA~
bRegistered=FALSE; FY]pv6@
bTray=FALSE; 5YiZ-CQ>
//}}AFX_DATA_INIT _Vjpw,
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 GQN98Y+h
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lhqQCV
} XRa(sXA3
k(P3LJcYQ
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -bypuMQ-p
{ *URdd,){i
CDialog::DoDataExchange(pDX); vwKw?Z0%J
//{{AFX_DATA_MAP(CCaptureDlg) v f`9*x F
DDX_Control(pDX, IDC_KEY, m_Key); P##Z[$IJ3
DDX_Check(pDX, IDC_CONTROL, m_bControl); &Y1`?1;nw
DDX_Check(pDX, IDC_ALT, m_bAlt); uBmxh%]C~
DDX_Check(pDX, IDC_SHIFT, m_bShift); bV@7mmz:X+
DDX_Text(pDX, IDC_PATH, m_Path); a3q\<"|
DDX_Text(pDX, IDC_NUMBER, m_Number); 0G5'Y;8
//}}AFX_DATA_MAP x>%joKY[
} E0QPE5_
@(-yrU
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +?;j&p
//{{AFX_MSG_MAP(CCaptureDlg) pOMgEEhfS
ON_WM_SYSCOMMAND() _J,xT
ON_WM_PAINT() flG=9~qcGQ
ON_WM_QUERYDRAGICON() {FWyu5.
ON_BN_CLICKED(ID_ABOUT, OnAbout) t5paYw-b
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vMhYpt?7\
ON_BN_CLICKED(ID_CHANGE, OnChange) IAI(Ix
//}}AFX_MSG_MAP 2F1ZAl
END_MESSAGE_MAP() *g1L$FBG
CtM'L
BOOL CCaptureDlg::OnInitDialog() w
NH9WG
{ gN?0m4[$i
CDialog::OnInitDialog(); lEHwZ<je
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /xySwSmh3
ASSERT(IDM_ABOUTBOX < 0xF000); 3 > |uF
CMenu* pSysMenu = GetSystemMenu(FALSE); -Q$b7*"z(
if (pSysMenu != NULL) -#aZF2z
{ 'M8aW!~
CString strAboutMenu; Wr5 Q5s)c
strAboutMenu.LoadString(IDS_ABOUTBOX); hK(tPl$
if (!strAboutMenu.IsEmpty()) vU!8`x)
{ :.$"kXm^
pSysMenu->AppendMenu(MF_SEPARATOR); ?;
[ T
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5`~mqqR5
} ?E<c[*F05
} QH~Jy*\+PX
SetIcon(m_hIcon, TRUE); // Set big icon G>%AZr{M
SetIcon(m_hIcon, FALSE); // Set small icon j0FW8!!-g
m_Key.SetCurSel(0); 3B{[%#vO
RegisterHotkey(); ?,07;>&
CMenu* pMenu=GetSystemMenu(FALSE); ]#zZWg
zv
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e .l!3xY2'
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); L/?]^!.
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); RN[]Jt#6
return TRUE; // return TRUE unless you set the focus to a control <Ct_d
Cc
} (#o t^
!v9lk9SV
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O8lFx_N7Q
{ )iU^&@[S
if ((nID & 0xFFF0) == IDM_ABOUTBOX) FXahZW~Ol
{ Uoji@
CAboutDlg dlgAbout; =g~W%})
dlgAbout.DoModal(); +tt9R_S
} ]p]UTCo!'
else IU#x[P!
{ 5ZK&fKeCF
CDialog::OnSysCommand(nID, lParam); / p)F>WR
} Zu21L3
} s+,&|;Q
m'x;,xfY&F
void CCaptureDlg::OnPaint() b,@aqu
{ %d;<2b0
if (IsIconic()) tnb$sulc+
{ VFj(M
j`}G
CPaintDC dc(this); // device context for painting /0lC KU!=
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); S~)w\(r
// Center icon in client rectangle z/ 7$NxJH
int cxIcon = GetSystemMetrics(SM_CXICON); 3;_
n{&
int cyIcon = GetSystemMetrics(SM_CYICON); -(#-I$z
CRect rect; mS%4gx~~_n
GetClientRect(&rect); ;`(R7X
*3
int x = (rect.Width() - cxIcon + 1) / 2; MBw-*K'?zB
int y = (rect.Height() - cyIcon + 1) / 2; CPviR<ms_
// Draw the icon NTmi 2c
dc.DrawIcon(x, y, m_hIcon); /L v1$~
} dMvp&M\\'
else +E5=$`
{ %=Tr^{i
CDialog::OnPaint(); ;..o7I
} 1 ] #9
} K
|*5Kwi
3yV'XxC
HCURSOR CCaptureDlg::OnQueryDragIcon() j~`\XX{>
{ {]kaJ{U>
return (HCURSOR) m_hIcon; U)D[]BVg
} -5bA
$
wLJ]&puwm
void CCaptureDlg::OnCancel() :%X Ls,
{ UE :HMn6
if(bTray) [}2Z/
DeleteIcon(); 2.lgT|p
CDialog::OnCancel(); 5`-UMz<]
} PaO-J&<
qlsQ|/'D
void CCaptureDlg::OnAbout() O1P=#l iYX
{ 7G93,dJ
CAboutDlg dlg; j9R6ta3\l
dlg.DoModal(); OqUr9?+
} 6bO~/mpWT~
{Wv%zA*8
void CCaptureDlg::OnBrowse() >v+jh(^
{ Y`GOER
CString str; d=3'?l`
BROWSEINFO bi; _yH`t[
char name[MAX_PATH]; T!2=*~A
ZeroMemory(&bi,sizeof(BROWSEINFO)); jqnCA<G~B-
bi.hwndOwner=GetSafeHwnd(); D'_Bz8H!p
bi.pszDisplayName=name; h|;qG)f^
bi.lpszTitle="Select folder"; {i [y9
bi.ulFlags=BIF_RETURNONLYFSDIRS; %.HJK
LPITEMIDLIST idl=SHBrowseForFolder(&bi); zsXpA0~3s
if(idl==NULL)
..W-76{
return; s9)8b$t]
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); LM)`CELsYc
str.ReleaseBuffer(); f{&bOF v
m_Path=str; 3l1cyPv
if(str.GetAt(str.GetLength()-1)!='\\') J
CGC
m_Path+="\\"; ;_?MX/w|&
UpdateData(FALSE); )2e#HBnH
} )?aaBaN$
/JJw 6[N
void CCaptureDlg::SaveBmp() n,'OiVl[
{ h9s >LY
CDC dc; g);^NAA
dc.CreateDC("DISPLAY",NULL,NULL,NULL); hJ;$A*Y
CBitmap bm; B 0ee?VC
int Width=GetSystemMetrics(SM_CXSCREEN); Wp0
Dq(
int Height=GetSystemMetrics(SM_CYSCREEN); ]wVk+%e
bm.CreateCompatibleBitmap(&dc,Width,Height); YT#3n
CDC tdc; ]lO h&Cz[
tdc.CreateCompatibleDC(&dc); s5&@Cxzl
CBitmap*pOld=tdc.SelectObject(&bm); `~BZ1)@
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,e722wz
tdc.SelectObject(pOld); ~x:DXEV,
BITMAP btm; w.{&=WTr
bm.GetBitmap(&btm); v-b0\_
DWORD size=btm.bmWidthBytes*btm.bmHeight; lUOvm\
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $md%xmQ[
BITMAPINFOHEADER bih; v`PY>c6~
bih.biBitCount=btm.bmBitsPixel; *Zk>2<^R
bih.biClrImportant=0; &a0r%L()X
bih.biClrUsed=0; g"VMeW^
bih.biCompression=0; 23F/\2MSG
bih.biHeight=btm.bmHeight; u.XQ&
bih.biPlanes=1; `:NaEF?Sj
bih.biSize=sizeof(BITMAPINFOHEADER); wK_]/Q-L
bih.biSizeImage=size; u+m,b76
bih.biWidth=btm.bmWidth; NpP')m!`}
bih.biXPelsPerMeter=0; <UP
m=Hb
bih.biYPelsPerMeter=0; 7,
}
$u
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8IQtz2
static int filecount=0; feM6K!fL`
CString name; hZXXBp
name.Format("pict%04d.bmp",filecount++); {Ro2ouQ!V
name=m_Path+name; thlY0XCq,%
BITMAPFILEHEADER bfh; ||7x;2e
bfh.bfReserved1=bfh.bfReserved2=0; LW6ZAETyL
bfh.bfType=((WORD)('M'<< 8)|'B'); y9H%
Xl
bfh.bfSize=54+size; <xpph
t<
bfh.bfOffBits=54; _gj&$zP
CFile bf; ;*TIM%6#
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S[3iA~)Z-
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); XN=67f$Hw
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =ac_,]z
bf.WriteHuge(lpData,size); en S}A*Io
bf.Close(); n:
ui
nCount++; MM_k
]-7
} #p(h]T32
GlobalFreePtr(lpData); Fxs;Fp
if(nCount==1) ;ea]$9
m_Number.Format("%d picture captured.",nCount); Rk<@?(l!6x
else :$;Fhf<5
m_Number.Format("%d pictures captured.",nCount); a]17qMl
UpdateData(FALSE); q%n6K
} gN8hJG'0
$,=6[T!z+e
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) SvM6iZ]
{ !%+2Yifna
if(pMsg -> message == WM_KEYDOWN) jd]s<C3o
{ "xI"
if(pMsg -> wParam == VK_ESCAPE) aimarU
return TRUE; qU2~fNY
if(pMsg -> wParam == VK_RETURN) k %e^kej
return TRUE; <P[T!gST
} bK"SKV
return CDialog::PreTranslateMessage(pMsg); i$G;f^Z!Y
} (
9!k#
H`bSYjgM!
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u@'0Vk0zGH
{ :NHH
Dl
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ xJ^>pg8
SaveBmp(); l:0s2
return FALSE; [v7^i_d
} $E<Esf$
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fqX"Lus `=
CMenu pop; ZRxZume<f
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 00I}o%akO
CMenu*pMenu=pop.GetSubMenu(0); Ars687WB
pMenu->SetDefaultItem(ID_EXITICON); s4Sd>D7
CPoint pt; KH)D08
GetCursorPos(&pt); Xp\/YJOibd
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); OMhef,,H
if(id==ID_EXITICON) h^,8rd
DeleteIcon(); 1wzqGmjmt
else if(id==ID_EXIT) (fNUj4[
OnCancel(); v 8T$ &-HJ
return FALSE; 'w>_+jLT
} #/"8F O%~p
LRESULT res= CDialog::WindowProc(message, wParam, lParam); mpAR7AG6
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W>r#RXmh
AddIcon(); ?]fF3 SJk
return res; 2XTPBZNe
} qPB8O1fyU
tO7v4
void CCaptureDlg::AddIcon() LTNj| u
{ !TZhQiorC
NOTIFYICONDATA data; s+Fi @lg,
data.cbSize=sizeof(NOTIFYICONDATA); iHwLZ[O{
CString tip; UNijFGi
tip.LoadString(IDS_ICONTIP); IdYzgDH
data.hIcon=GetIcon(0); ] h-,o
R?e
data.hWnd=GetSafeHwnd(); q)H1pwxD
strcpy(data.szTip,tip); u p.Q>28r
data.uCallbackMessage=IDM_SHELL; l Z#o+d2Y
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; lzw3= H
data.uID=98; F:*W5xX
Shell_NotifyIcon(NIM_ADD,&data); sK{l 9
ShowWindow(SW_HIDE); +iRq8aS_
bTray=TRUE; .Ha'p.
} 56^+;^f^`
JdIlWJY
void CCaptureDlg::DeleteIcon() CTWn2tpW
{ h\plQ[T
NOTIFYICONDATA data; 8N:owK
data.cbSize=sizeof(NOTIFYICONDATA); &_JD)mM5
data.hWnd=GetSafeHwnd(); CkJCi
data.uID=98; Gl1jxxd
Shell_NotifyIcon(NIM_DELETE,&data); ,Jc m+Wb
ShowWindow(SW_SHOW); ^w ] /
SetForegroundWindow(); lb'GXd %
ShowWindow(SW_SHOWNORMAL); S3L~~X/=
bTray=FALSE; obdFS,JxxG
} [
W2fd\4
91Uj}n%
void CCaptureDlg::OnChange() iX0iRC6f
{ pF
^#}L
RegisterHotkey(); #cj6{%c4
} fc/ &X
MCU_Z[N#10
BOOL CCaptureDlg::RegisterHotkey() *~m+Nc`D,N
{ 8ElKD{.BU8
UpdateData(); Z%I
UCHAR mask=0; ;'81jbh
UCHAR key=0; jTLSdul+
if(m_bControl) z4&iK)x
mask|=4; V9ssH87#
if(m_bAlt) lKEkXO
mask|=2; PW3GL3+
if(m_bShift) \*,=S52
mask|=1; }g$(+1g
key=Key_Table[m_Key.GetCurSel()]; G^q3Z#P
if(bRegistered){ gM [w1^lj
DeleteHotkey(GetSafeHwnd(),cKey,cMask); m*$|GW9
bRegistered=FALSE; ]f]<4HD=i
} 5K|"\
cMask=mask; Ed9Z9
cKey=key; }I@L}f5N
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )DYI
.
return bRegistered; ##Z_QB(;
} b;)~wU=
%0? M?Jf
四、小结 J9K3s_SN
^(*n]
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。