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:
Pko2fJt1
SGK=WLGM8 一、实现方法
2Ysl|xRo ZBcT@hxm 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:
j 5{"j f;Uf=.#F #pragma data_seg("shareddata")
*B ]5K{N HHOOK hHook =NULL; //钩子句柄
9d8bh4[ UINT nHookCount =0; //挂接的程序数目
T>e4Og"? static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
\
W.uV[\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
DuzJQSv static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Y%"73.x static int KeyCount =0;
}+3v5Nz; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
tJgo%P1 #pragma data_seg()
#lo1GoL\ \pJBBG 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。
3<vw#]yL n |Is&fy 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:
)cUFb:D*" >ngP\&\ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
{S2?
} cKey,UCHAR cMask)
!hS~\+E {
`fm^#Nw BOOL bAdded=FALSE;
u?-X07_ for(int index=0;index<MAX_KEY;index++){
PY{])z3N if(hCallWnd[index]==0){
/QT"5fxKJ hCallWnd[index]=hWnd;
8O='Q-&8 HotKey[index]=cKey;
%g+*.8;"b HotKeyMask[index]=cMask;
jcVK4jW bAdded=TRUE;
XZ1oV?Z4 KeyCount++;
W:V:Ej7 h break;
O77bm,E }
-Uu65m~:{k }
fH6mv0 return bAdded;
WY3D.z-</ }
yWkg4 //删除热键
mO|YX/> BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
p%?m|(4f {
co-dq\P BOOL bRemoved=FALSE;
J=@D]I*3 for(int index=0;index<MAX_KEY;index++){
']cRSj. if(hCallWnd[index]==hWnd){
g[ dI% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kEr;p{5 hCallWnd[index]=NULL;
,'0Zd(s HotKey[index]=0;
!caY HotKeyMask[index]=0;
)~CnDk}^R bRemoved=TRUE;
jXCSD@?]K KeyCount--;
vD@=V#T break;
L%sskV( }
D<SLv,Y }
CQGq}.Jt! }
Q`* v|Lp return bRemoved;
U 4Sxr }
*W&}}iL t7].33%\ Aq~}<qkIF+ DLL中的钩子函数如下:
`N.^+Mvx- I C?bqC+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
$-Wn|w+h<a {
(|kcSnF0 BOOL bProcessed=FALSE;
~n<U8cm O if(HC_ACTION==nCode)
brXLx+H8 {
dvLO #o{ if((lParam&0xc0000000)==0xc0000000){// 有键松开
KDQqN]rg switch(wParam)
Yfotq9.=+ {
gZ b+m case VK_MENU:
-<MA\iSP MaskBits&=~ALTBIT;
QgZ`~ break;
ljJi|+^$ case VK_CONTROL:
qY^@^)b[ MaskBits&=~CTRLBIT;
a"6AZT"8 break;
T|fmO<e*n case VK_SHIFT:
zJ9[),;7B MaskBits&=~SHIFTBIT;
:#I7);ol break;
\4qwLM?E^ default: //judge the key and send message
~,jBm^4 break;
sCi"qtHP }
byrK``f for(int index=0;index<MAX_KEY;index++){
M`jqUg if(hCallWnd[index]==NULL)
,|u^-J@
continue;
%hnv
go:^g if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
gp`H>Sn.| {
"?r=n@Kv SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
45+w)Vf! bProcessed=TRUE;
@s[Vtw%f }
#Y9'n0 AL }
qT}AY.O%^ }
ZA>p~Zt else if((lParam&0xc000ffff)==1){ //有键按下
Yc] switch(wParam)
(}jYi*B {
,dZ&i!@? case VK_MENU:
S="teH[ MaskBits|=ALTBIT;
Vy6A]U\% break;
*RpBKm&^7 case VK_CONTROL:
/xseI)y.B MaskBits|=CTRLBIT;
wAn}ic".b break;
WhU-^`[* case VK_SHIFT:
p(J,fus MaskBits|=SHIFTBIT;
(Z{&[h break;
*pMu,?uE default: //judge the key and send message
<XAW-m9SC break;
W{6%Hhp }
<R%]9#re for(int index=0;index<MAX_KEY;index++){
|5(<
Vk= if(hCallWnd[index]==NULL)
'tRaF continue;
Kq. MmR!gl if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
mxxuD"5 {
=^L?Sgg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
(ZI11[e{ bProcessed=TRUE;
^ .]]0Rp& }
g*uo2-MN&e }
sh|@X\EZO }
aLKvl~s;m if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
GLIe8T*ht for(int index=0;index<MAX_KEY;index++){
N9s ,.. if(hCallWnd[index]==NULL)
H|]~(.w 1} continue;
vI)-Zz[3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Ev' BmDk SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
luYa+E0 //lParam的意义可看MSDN中WM_KEYDOWN部分
fsr0E=nV }
?jDdF }
nWd]P\a'V }
_#2AdhCu return CallNextHookEx( hHook, nCode, wParam, lParam );
9N?BWv} }
DQ a0S7I a1p}y2 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:
{Al}a`da <l,Kg
'v BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2G4OK7x BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
e?"XMY X=Th 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"~%[k 6,D)o/_ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Uz&XqjS {
H%AF, if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
fNkN {
V6.w=6:`X //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Mr8r(LGY SaveBmp();
G{8> return FALSE;
'aFj yY?% }
j![ ; ; …… //其它处理及默认处理
1E]|>)$ }
X 9lh@`3 f T&>L RkW)B^# 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。
%#^)hX,+Q Z6Owxqfht 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。
K:i{us` ,2I8,MOg 二、编程步骤
c,\!<4 \vU1*:3 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";
0!^vQ ~S='~ g) 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
jZ;dY~fE jw^Pt~@ 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;
-wqnmK+G m3La;%aA0 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;
T==(Pw7R7 rTR4j>Ua~ 5、 添加代码,编译运行程序。
Ai 9UB=[R 6jGPmOM/ 三、程序代码
U6 R"eQUTV D)u 9Y ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
QnWM<6xK" #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
<`~zKFUQ[ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]B;\?Tim #if _MSC_VER > 1000
ns{BU->f #pragma once
;T6x$e #endif // _MSC_VER > 1000
^YpA@`n #ifndef __AFXWIN_H__
s /?&H- #error include 'stdafx.h' before including this file for PCH
cP4K9:k #endif
k>N >_{\ #include "resource.h" // main symbols
Pd,+=
ML
class CHookApp : public CWinApp
eTV%+ {
cvf@B_iN9 public:
YRkp(}*!\ CHookApp();
$SP*hkU // Overrides
]T3dZ`-( // ClassWizard generated virtual function overrides
-d+o\qp"# //{{AFX_VIRTUAL(CHookApp)
"A9qC*6[ public:
Pl/}`H:R& virtual BOOL InitInstance();
q0sdL86 virtual int ExitInstance();
;rj|> //}}AFX_VIRTUAL
W]B75 //{{AFX_MSG(CHookApp)
[H4)p ,R // NOTE - the ClassWizard will add and remove member functions here.
_GW, 9s^A // DO NOT EDIT what you see in these blocks of generated code !
'lWgHmE //}}AFX_MSG
#ULjK*)R DECLARE_MESSAGE_MAP()
$R&K-;D/8 };
v?O6|0#x LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k`(Cwp{Oc BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Kry^47" BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
L9}%tEP BOOL InitHotkey();
IIh \d.o BOOL UnInit();
Fo.p}j+> #endif
'nQQqx%v W ])Lc3X //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
JmBe1"hs #include "stdafx.h"
^.gBHZ #include "hook.h"
UlD]!5NO #include <windowsx.h>
I?R?rW #ifdef _DEBUG
bnzIDsw!Q #define new DEBUG_NEW
!,Uzt1K: #undef THIS_FILE
KAI/*G\z static char THIS_FILE[] = __FILE__;
@h
E7F} #endif
Ge_Gx*R #define MAX_KEY 100
e8,!x9%J #define CTRLBIT 0x04
wAA9M4 #define ALTBIT 0x02
is6M{K3 #define SHIFTBIT 0x01
JqTR4[`Z\ #pragma data_seg("shareddata")
Oj]4jRew HHOOK hHook =NULL;
~ TfN*0 UINT nHookCount =0;
8?4/ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
s2kom) static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
:ceT8-PBRx static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Va-. static int KeyCount =0;
1e)5D& njS static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
-qs
R,H #pragma data_seg()
L "[>tY HINSTANCE hins;
3uy^o void VerifyWindow();
W*WSjuFr2 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
qe_qag9 //{{AFX_MSG_MAP(CHookApp)
h8
!(WO! // NOTE - the ClassWizard will add and remove mapping macros here.
^3O`8o // DO NOT EDIT what you see in these blocks of generated code!
i5 ;_ //}}AFX_MSG_MAP
)YY8`\F>1 END_MESSAGE_MAP()
\R|qXB $ q/eod CHookApp::CHookApp()
spG3"Eodi {
MZWicfUy // TODO: add construction code here,
c`s ]ciC // Place all significant initialization in InitInstance
Dd'4W }
lU8X{SV! N_o|2 CHookApp theApp;
bH`r=@.:cu LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Q&`if
O {
Vg^,Ky, BOOL bProcessed=FALSE;
1zGhX]z if(HC_ACTION==nCode)
rp_Aw {
c 4
bo if((lParam&0xc0000000)==0xc0000000){// Key up
&s~b1Va switch(wParam)
"?Yf3G: \0 {
*wl&Zzx case VK_MENU:
#-7m@EU;O MaskBits&=~ALTBIT;
&]S\GnqlU] break;
j<PpCL_8% case VK_CONTROL:
+@BjQ|UZ MaskBits&=~CTRLBIT;
:TRhk. break;
X$(YCb case VK_SHIFT:
+2JC**)I MaskBits&=~SHIFTBIT;
]&_z@Z.i break;
e3=-7FU default: //judge the key and send message
20`QA
u)' break;
r}M2t$nv }
9?I?;l{ for(int index=0;index<MAX_KEY;index++){
bZCNW$C3l if(hCallWnd[index]==NULL)
ZRn!z`.0 continue;
PL*1-t?# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
i:n1Di1~E {
jpt-5@5O SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
u!TMt8+c bProcessed=TRUE;
P*g:rg }
cNG`-+U' }
/|WBk} }
!f01.Tq8 else if((lParam&0xc000ffff)==1){ //Key down
+z O.|`+ switch(wParam)
|wkUnn4UB8 {
\xjI=P'-25 case VK_MENU:
_r?.%]\. MaskBits|=ALTBIT;
]EfM;'j[ break;
9/dI 6 P7 case VK_CONTROL:
|*y'H* MaskBits|=CTRLBIT;
O`TM} break;
k. ?@qCs[ case VK_SHIFT:
rOTxD/ MaskBits|=SHIFTBIT;
.mvpFdn break;
k~=W1R% default: //judge the key and send message
V]6CHE:BS break;
I.{%e;Reg }
q 1~3T;Il for(int index=0;index<MAX_KEY;index++)
k*|WI$ {
fYiof]v@_m if(hCallWnd[index]==NULL)
:89AYqT" continue;
Rd,5&X$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^+u/Lw& {
b>'y[P! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_qjkiKm?1F bProcessed=TRUE;
UUR` m }
+qee8QH }
5K {{o'' }
S&{#sl#e if(!bProcessed){
AI9#\$aGV for(int index=0;index<MAX_KEY;index++){
@%gth@8 if(hCallWnd[index]==NULL)
k[8{N continue;
C7_nA:Rc if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|`Q2K9'4bL SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
O>/&-Wk= }
~pPj }
Y~P*
!g }
"#=WD return CallNextHookEx( hHook, nCode, wParam, lParam );
li }
fT0+inRG cjc1iciZ BOOL InitHotkey()
>{.|Ng4K {
Fh~
pB>t if(hHook!=NULL){
AR6hfdDDT nHookCount++;
J9q[u[QZ9O return TRUE;
n7iIY4gZ }
VY j
pl else
Xo
,U$zE hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
{LqahO* if(hHook!=NULL)
?h3t"9 nHookCount++;
9e0t return (hHook!=NULL);
63T4''bwu }
0<u(!iL BOOL UnInit()
2W6t0MgZ {
iE* Y@E5x0 if(nHookCount>1){
B<!WAw+ nHookCount--;
M:R|hR{=* return TRUE;
e<duDW$X }
r%vO^8FQ BOOL unhooked = UnhookWindowsHookEx(hHook);
*9|*21 if(unhooked==TRUE){
:\IZ- nHookCount=0;
FGu#Pa hHook=NULL;
L
/V;; }
04@?Jb1 * return unhooked;
Zz^!QlF }
`+ 5,=S VZCCMh- BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
K yDPD' {
\KkAU 6 BOOL bAdded=FALSE;
a"whg~ for(int index=0;index<MAX_KEY;index++){
e8VtKVcY if(hCallWnd[index]==0){
gbjql+Mx+ hCallWnd[index]=hWnd;
pXl*`[0X# HotKey[index]=cKey;
LHHDD\X HotKeyMask[index]=cMask;
c-=z<:Kf bAdded=TRUE;
y aLc~K KeyCount++;
k*!f@ M break;
?~WDlj3 }
QRlrcauM }
z~\Y*\f^Y3 return bAdded;
5v5K}hx }
cnR18NK :i/uRR BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E2( {[J {
7|^5E*8/ BOOL bRemoved=FALSE;
Ue!~|: for(int index=0;index<MAX_KEY;index++){
#Y<(7 if(hCallWnd[index]==hWnd){
TRku(w1f if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
N\W4LO6 hCallWnd[index]=NULL;
4<q'QU#l< HotKey[index]=0;
gYW HotKeyMask[index]=0;
TUM7(-,9 bRemoved=TRUE;
ZGC*BP/ KeyCount--;
>NAg*1 break;
/4Jm]" }
N2\{h(*u }
}o2e&.$4d }
+~!\;71:f return bRemoved;
oh.8WlI }
#6F/:j; Qcs>BOV~ void VerifyWindow()
*S] K@g {
7N}==T89[ for(int i=0;i<MAX_KEY;i++){
faPgp if(hCallWnd
!=NULL){ IT0 [;eqR
if(!IsWindow(hCallWnd)){ /r Z`e'}
hCallWnd=NULL; Uq:CM6q\
HotKey=0; b";D*\=x
HotKeyMask=0; !y-,r4\@`
KeyCount--; :2E?|}`7\
} /6nj
4.xxc
} t{o&$s93
} 3B3l)eX
} A
v[|G4n
WzdE XcY
BOOL CHookApp::InitInstance() hVdPO
{ yvt
:/X
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Pef$-3aP>E
hins=AfxGetInstanceHandle(); prCr"y` M
InitHotkey(); 0qhSV B5
return CWinApp::InitInstance(); ZFa<{J<2
} -|YDKcL
mxkv{;ad
int CHookApp::ExitInstance() -efB8)A
{ N!YjM x)P
VerifyWindow(); oz#;7
?9
UnInit(); (#5TM1/A
return CWinApp::ExitInstance(); {5J: ]{p
} y5$AAas
]n (:X
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $}z%}v
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) pPnJf{
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1^^9'/
#if _MSC_VER > 1000 #S*cFnd
#pragma once KdU&q+C^
#endif // _MSC_VER > 1000 @zAav>
K %Qj<{)
class CCaptureDlg : public CDialog Nd;,Wz]
{ ~2 M+Me
// Construction _~a5;[~
public: '1[Bbs
BOOL bTray; Q|i`s=|
BOOL bRegistered; O&ZVu>`g
BOOL RegisterHotkey(); Yo a|.2f
UCHAR cKey; K
f}h{X
UCHAR cMask; >gGdzL
void DeleteIcon(); T<S_C$O
void AddIcon(); X+;{&Efrl
UINT nCount; ^rIe"Kx
void SaveBmp(); I%gDqfdL
CCaptureDlg(CWnd* pParent = NULL); // standard constructor GZk{tTv
// Dialog Data qTi%].F"G
//{{AFX_DATA(CCaptureDlg) SVj4K\F
enum { IDD = IDD_CAPTURE_DIALOG }; VKb'!Ystl
CComboBox m_Key; 8V(-S,
BOOL m_bControl; $<v{$UOh
BOOL m_bAlt; $5S/~8g(
BOOL m_bShift; 8*m=U@5]
CString m_Path; x9B5@2J1
CString m_Number; J4>k9~q
//}}AFX_DATA ]] Jg%}o
// ClassWizard generated virtual function overrides _{ f7e^;
//{{AFX_VIRTUAL(CCaptureDlg) )9?
^;HS
public: C
Ch38qBp
virtual BOOL PreTranslateMessage(MSG* pMsg); 8zWKKcf7t
protected: GjGt'
m*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l>iE1`iL<
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #oQDt'
//}}AFX_VIRTUAL XWNDpL`j5
// Implementation kNDN<L
protected: N\Li/
HICON m_hIcon; @>4=}z_e
// Generated message map functions 8@Hl0{q
//{{AFX_MSG(CCaptureDlg) Q]"u?Q]
virtual BOOL OnInitDialog(); h Lv_ER?
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Gp5[H}8K
afx_msg void OnPaint(); iQj2aK Gs
afx_msg HCURSOR OnQueryDragIcon(); [|E|(@J
virtual void OnCancel(); =!Ce#p?h,
afx_msg void OnAbout(); dPO|x+N,
afx_msg void OnBrowse(); `ot<BwxJ
afx_msg void OnChange(); Md(h-wYr
//}}AFX_MSG y`Km96Ui
DECLARE_MESSAGE_MAP() Y KWtsy
}; <QZ X""
#endif PS3%V_2
?84B0K2Ns
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $TR#-q
#include "stdafx.h" V-.Nc#
#include "Capture.h" D8,V'n>L
#include "CaptureDlg.h" jpI=B
#include <windowsx.h> wrmbO T
#pragma comment(lib,"hook.lib") $(JB"%S8c
#ifdef _DEBUG 9m:G8j'
#define new DEBUG_NEW t!JD]j>q
#undef THIS_FILE >wJt# ZB
static char THIS_FILE[] = __FILE__; (HD=m,}
#endif )mvD2]fK
#define IDM_SHELL WM_USER+1 Tyk\l>S
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]<B@g($
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); * M,'F^E2
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AKkr
)VgY
class CAboutDlg : public CDialog |ZBHXv
{ Rd^X.
public: _8eN^oc%
CAboutDlg(); ZclZD{%8J
// Dialog Data 6y
d/3k
//{{AFX_DATA(CAboutDlg) 0b~{l;
enum { IDD = IDD_ABOUTBOX }; NP?hoqeKs
//}}AFX_DATA @/yJTMcf
// ClassWizard generated virtual function overrides Zwxu3R_
//{{AFX_VIRTUAL(CAboutDlg) q;0QI{:5v
protected: ;*=MI/"N
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~w9.}
//}}AFX_VIRTUAL ZB@Bj>,bp
// Implementation >ho$mvT
protected: yYri.n
//{{AFX_MSG(CAboutDlg) \~bx%VWW4
//}}AFX_MSG z=/xv},
DECLARE_MESSAGE_MAP() !1<?ddH6
}; j\9v1O!T
C^W9=OH
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C.rLog#
{ Vv J]*D+e
//{{AFX_DATA_INIT(CAboutDlg) *4oj '}
//}}AFX_DATA_INIT tH\ aHU[
} ;4]
s P^+
k~+(X|!5w
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }'.k
{ <~}#Q,9
CDialog::DoDataExchange(pDX); nm.~~h+8M
//{{AFX_DATA_MAP(CAboutDlg) h..D1(M
//}}AFX_DATA_MAP @%}4R`S0
} 1deNrmp%
?}D|]i34
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1y)|m63&
//{{AFX_MSG_MAP(CAboutDlg) >nA6w$
// No message handlers @+(TM5Ub
//}}AFX_MSG_MAP Ebk_(Py\
END_MESSAGE_MAP() 5l
ioL)
P.Uz[_&l6
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gk.c"$2
: CDialog(CCaptureDlg::IDD, pParent) \ Rff3$
{ 0>KW94
//{{AFX_DATA_INIT(CCaptureDlg) asQXl#4r
m_bControl = FALSE; @ a?^2X^
m_bAlt = FALSE; ; M%n=+[O
m_bShift = FALSE; EX.`6,:+2
m_Path = _T("c:\\"); fZ)M
Dq
m_Number = _T("0 picture captured."); se:lKZZ]
nCount=0; =|_{J"sv
bRegistered=FALSE; *#n?6KqZ
bTray=FALSE;
4gRt^T-?
//}}AFX_DATA_INIT RO10$1IW.2
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 u_~*)w+mS@
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); },@1i<Bb
} @C34^\aH+
?-g/hXx;
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dLq)Z*r
{ Np?%pB!Q
CDialog::DoDataExchange(pDX); 6)B6c. 5o
//{{AFX_DATA_MAP(CCaptureDlg) A^9RGz4=
DDX_Control(pDX, IDC_KEY, m_Key); %1Pn;bUU!
DDX_Check(pDX, IDC_CONTROL, m_bControl); !L)~*!+Gf
DDX_Check(pDX, IDC_ALT, m_bAlt); RO?%0-6O&
DDX_Check(pDX, IDC_SHIFT, m_bShift); wh~g{(Xvq
DDX_Text(pDX, IDC_PATH, m_Path); (g8<"<
N?
DDX_Text(pDX, IDC_NUMBER, m_Number); S3oSc<&2
//}}AFX_DATA_MAP (4WAoye |
} 3TDjWW;#~
r?l7_aBv3
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D0 f.XWd
//{{AFX_MSG_MAP(CCaptureDlg) TrBBV]4
ON_WM_SYSCOMMAND() H]XY
ON_WM_PAINT() ~)k OOoH
ON_WM_QUERYDRAGICON() r- :u*
ON_BN_CLICKED(ID_ABOUT, OnAbout) b?~%u+'3
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) O
DLRzk(
ON_BN_CLICKED(ID_CHANGE, OnChange) bZB7t`C5
//}}AFX_MSG_MAP 0 kM4\En
END_MESSAGE_MAP() 9O.okU
XYM 5'
BOOL CCaptureDlg::OnInitDialog() YgN:$+g5
{
x=%p~$C
CDialog::OnInitDialog(); e/p 2| 4;
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0F495'*A
ASSERT(IDM_ABOUTBOX < 0xF000); +mgmC_Q(0
CMenu* pSysMenu = GetSystemMenu(FALSE); >5aZ?#TS1
if (pSysMenu != NULL) VW[!%<
{ 2qF
?%
CString strAboutMenu; R2 I
7d'|v
strAboutMenu.LoadString(IDS_ABOUTBOX); yi*2^??`
1
if (!strAboutMenu.IsEmpty()) nX|f?5 O
{ U^n71m>]%T
pSysMenu->AppendMenu(MF_SEPARATOR); XIAHUT5~J
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'fqX^v5n
} *x;&fyR
} +@ FM~q
SetIcon(m_hIcon, TRUE); // Set big icon []v t\I
;
SetIcon(m_hIcon, FALSE); // Set small icon *&d>Vk."]
m_Key.SetCurSel(0); Nzo;j0 [
RegisterHotkey(); ^J
TrytIB
CMenu* pMenu=GetSystemMenu(FALSE); [K\Vc9
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); B3j
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m4<5jC`-M
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [f?fA[,[
return TRUE; // return TRUE unless you set the focus to a control X(`wj~45VX
} );]9M~$
Cmsg'KqqT
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J ^y1=PM
{ IYo{eX~=
if ((nID & 0xFFF0) == IDM_ABOUTBOX) =u5a'bp0;;
{ 9uNkd2#
CAboutDlg dlgAbout; kma)DW
dlgAbout.DoModal(); /5l"rni
} GbLuXU
else 1TagQ
{ <yw6Om:n<
CDialog::OnSysCommand(nID, lParam); xE2sb*
} 8K]5fkC|
} =nQgS.D
"zn<\z$l
void CCaptureDlg::OnPaint() * 7<{Xbsj^
{ 0I`)<o-
if (IsIconic()) /oWn0
{ .}wVM`81z
CPaintDC dc(this); // device context for painting q,8TOn
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oV(|51(f
// Center icon in client rectangle bI_6';hq!
int cxIcon = GetSystemMetrics(SM_CXICON); )dv w.X
int cyIcon = GetSystemMetrics(SM_CYICON); _5nS!CN
CRect rect; 8%@![$q<g
GetClientRect(&rect); aw\\oN*
int x = (rect.Width() - cxIcon + 1) / 2; LR:v$3 G(
int y = (rect.Height() - cyIcon + 1) / 2; a+U^mPe
// Draw the icon *WHQ1geI8
dc.DrawIcon(x, y, m_hIcon); V+A9.KoI
} n7J6YtUwP
else eVXlQO
{ 7O=N78M
CDialog::OnPaint(); bp>-{Nv
} ;yvx -
} m>H+noc^
Hd/|f;
HCURSOR CCaptureDlg::OnQueryDragIcon() YT*_
vmJV
{ [eb?Fd~WB]
return (HCURSOR) m_hIcon; s#8mD!T|
} pdz_qj!Z
d3m!34ml
void CCaptureDlg::OnCancel() '@ $L}C#OI
{ o*[n[\cR
if(bTray) kK0.j)(
DeleteIcon(); Q|DVB
CDialog::OnCancel(); e={X{5z0
} xzZ2?zWi
Tuk::
.jD
void CCaptureDlg::OnAbout() qy9RYIfZ
{ rwJCVkF
CAboutDlg dlg; lR[]A
dlg.DoModal(); (mNNTMe
} 8(6(,WwP}
<WHu</
void CCaptureDlg::OnBrowse() A>?_\<Gp
{ j5rB+
CString str; am'11a@*
BROWSEINFO bi; TbUouoc
char name[MAX_PATH]; Qb.Ve7c
ZeroMemory(&bi,sizeof(BROWSEINFO)); .J0Tn,m
bi.hwndOwner=GetSafeHwnd(); XTibx;yd<
bi.pszDisplayName=name; uPmK:9]3R
bi.lpszTitle="Select folder"; gPW% *|D,
bi.ulFlags=BIF_RETURNONLYFSDIRS; u6B,V
LPITEMIDLIST idl=SHBrowseForFolder(&bi); o4^|n1vN
if(idl==NULL) kK,Ne%}a2K
return; V!{}%;f
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); fj7\MTy
str.ReleaseBuffer(); vhEqHjR:
m_Path=str; 2`Ojw_$W7
if(str.GetAt(str.GetLength()-1)!='\\') =ObI
m_Path+="\\"; 3Uy4 8ue
UpdateData(FALSE); 8p;|&7
} iF_#cmSy$
3tt3:`g
void CCaptureDlg::SaveBmp() f"{|c@%
{ KBe\)Vs
CDC dc; '{[n,xeR
dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]T?Py)
CBitmap bm; 8JFns-5
int Width=GetSystemMetrics(SM_CXSCREEN); <Lt%[dn
int Height=GetSystemMetrics(SM_CYSCREEN); yx@%x?B
bm.CreateCompatibleBitmap(&dc,Width,Height); MJzY|
CDC tdc; At0ahy+
tdc.CreateCompatibleDC(&dc); _s1pif
CBitmap*pOld=tdc.SelectObject(&bm); Jp d|<\Ml
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F3%8E<QZd;
tdc.SelectObject(pOld); _K4E6c_
BITMAP btm; 7xhBdi[ dQ
bm.GetBitmap(&btm); ,Vc>'4E-
DWORD size=btm.bmWidthBytes*btm.bmHeight; I<``d Ne9Q
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9tMaOm
BITMAPINFOHEADER bih; ^%qe&Pe2
bih.biBitCount=btm.bmBitsPixel; :pp@x*uNP
bih.biClrImportant=0; Fuz'!
bih.biClrUsed=0; &(Yv&jX
bih.biCompression=0; SyB2A\A
bih.biHeight=btm.bmHeight; Fad.!%[
bih.biPlanes=1; mRNA ,*
bih.biSize=sizeof(BITMAPINFOHEADER); mr6 ~8I
bih.biSizeImage=size; EZY <k#
bih.biWidth=btm.bmWidth; P,eP>55'K
bih.biXPelsPerMeter=0;
4eRV?tE9
bih.biYPelsPerMeter=0; 2m*g,J?ql
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (\I9eBm
static int filecount=0; pef)c,U$
CString name; _<8~CWo:
name.Format("pict%04d.bmp",filecount++); qDVt
name=m_Path+name; @mJ#~@*(
BITMAPFILEHEADER bfh; e2dg{n$6"
bfh.bfReserved1=bfh.bfReserved2=0; f i_'Ny>#
bfh.bfType=((WORD)('M'<< 8)|'B'); 38 -vt,|
bfh.bfSize=54+size; eXYf"hU,
bfh.bfOffBits=54; !bq3c(d
CFile bf; B1U<m=Y
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ sU=7)*$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); vg"$&YX9"
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Zw`9B
bf.WriteHuge(lpData,size); \se
/2l
bf.Close(); MmbS["A
nCount++; Y6Mp[=
} C9FzTg/c
GlobalFreePtr(lpData); vT&)
5nN
if(nCount==1) ;usR=i36b
m_Number.Format("%d picture captured.",nCount); .,9e~6}
else YjR`}rdwo
m_Number.Format("%d pictures captured.",nCount); }t FRl
UpdateData(FALSE); M}S1Zz%Ii1
} om1@;u8u
%FhUjHm
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) nn?h;KzB
{ y!kU0
if(pMsg -> message == WM_KEYDOWN) e|e"lP
{ kR
!O-@GJ]
if(pMsg -> wParam == VK_ESCAPE) 6/=0RTd
return TRUE; b)(rlX
if(pMsg -> wParam == VK_RETURN) d$gT,+|vu
return TRUE; #GbfFoE
} }|j\QjH
return CDialog::PreTranslateMessage(pMsg); "8#EA<lsS
} JnY.]:
KB$SB25m
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6]^~yby P
{ QB"Tlw(
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n90DS/Yx
SaveBmp(); xe&w.aBI>
return FALSE; t9\}!{<s
} N fBH
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2N}U B=J
CMenu pop; t8?$q})RL
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^D5+S`V
CMenu*pMenu=pop.GetSubMenu(0); tZL {;@
pMenu->SetDefaultItem(ID_EXITICON); nc[Kh8N9
CPoint pt; xo.k:F
GetCursorPos(&pt); iRIO~XVo
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )7jJ3G*
if(id==ID_EXITICON) xCYK"v6\
DeleteIcon(); 4c'F.0^
else if(id==ID_EXIT) i!i=6m.q7
OnCancel(); \5pBK
return FALSE; TZ+- >CG
} =H_vRd
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (~
`?_
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Jmml2?V-c
AddIcon(); !zZ3F|+HB
return res; 8 t5o&8v
} -FGM>~x
/7fD;H^*
void CCaptureDlg::AddIcon() '5xvR G
{ t}wwRWo2?f
NOTIFYICONDATA data; dZ,IXA yB
data.cbSize=sizeof(NOTIFYICONDATA); wsEOcaie
CString tip; Tv6HPD$[
tip.LoadString(IDS_ICONTIP); oWb\T
2!m
data.hIcon=GetIcon(0); nXT/zfS
data.hWnd=GetSafeHwnd(); Fxx-2(U
strcpy(data.szTip,tip); PY76;D*`
data.uCallbackMessage=IDM_SHELL; 0Lx,qZ'
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E'cI} q
data.uID=98; 4G3u8)b=
Shell_NotifyIcon(NIM_ADD,&data); $}8@?>-w
ShowWindow(SW_HIDE); BA6(Owb
bTray=TRUE; :%4N4|
Q
} ;@FCaj&
]J^/`gc
void CCaptureDlg::DeleteIcon() { u %xc"0y
{ _O3X;U7rc
NOTIFYICONDATA data; 0$B X8?Z
data.cbSize=sizeof(NOTIFYICONDATA); 5rH?FQE
data.hWnd=GetSafeHwnd(); ^r@,(r6w
data.uID=98; `Fx+HIng,
Shell_NotifyIcon(NIM_DELETE,&data); H#/Hs#
ShowWindow(SW_SHOW); ;-Ki`x.oJ
SetForegroundWindow(); ~Z:)Y*
ShowWindow(SW_SHOWNORMAL); ufn%sA
bTray=FALSE; 7ND4Booul
} L-DL)8;`
fl}!V4
void CCaptureDlg::OnChange() ZKTY1JW_
{ 8.zYa(<2
RegisterHotkey(); }Y!v"DO#Q*
} \k9]c3V
<%N*IE"q
BOOL CCaptureDlg::RegisterHotkey() n/ZX$?tKAK
{ -A^o5s
UpdateData(); jRN>^Ur;g
UCHAR mask=0; !Bv.@~
UCHAR key=0; +yI2G!
$T9
if(m_bControl) @+7CfvM
mask|=4; ~5>k_\G8
if(m_bAlt) D4O^5?F)|
mask|=2; )8`i%2i=
if(m_bShift) -)Hc^'.
mask|=1; {_R{gpj'
key=Key_Table[m_Key.GetCurSel()]; Ei4Iv#Oi`
if(bRegistered){ 7nPjeh
DeleteHotkey(GetSafeHwnd(),cKey,cMask); <<PXh&wu0
bRegistered=FALSE; S1o[)q
} }z F,dst
cMask=mask; #Q"04'g
cKey=key; (
TJGJY
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9Cs/B*3 )b
return bRegistered; g=$nNQ
\6=
} (tCBbPW6T?
zSagsH |W
四、小结 *Ksk1T+>
'<U4D
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。