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:
qiEw[3Za]' W:5uoO]=< 一、实现方法
yW3!V-iA ca )n*SD 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:
gY!+x=cx0 jQ>~ #pragma data_seg("shareddata")
>3aB{[[N HHOOK hHook =NULL; //钩子句柄
*CtWDUxSdW UINT nHookCount =0; //挂接的程序数目
{`RCh]W static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
`Hlv*" w$ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
>|j8j:S[ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Fsdp"X. static int KeyCount =0;
B \WIoz;' static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
eKpWFP0 #pragma data_seg()
hA"N&v~ N\vc<Zpn 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。
|e9}G,1 E:i3
/Ep? 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:
+Q'/c0o r^@*Cir BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
kL&^/([9 cKey,UCHAR cMask)
0zEn`rq& {
"ex?
#qD& BOOL bAdded=FALSE;
}&!rIU for(int index=0;index<MAX_KEY;index++){
9]S}m[8k if(hCallWnd[index]==0){
:n>h[{o% hCallWnd[index]=hWnd;
yx-{}Yj^ HotKey[index]=cKey;
H,uOshR HotKeyMask[index]=cMask;
O" z=+79q bAdded=TRUE;
Ohjqdv@ KeyCount++;
MVTU$
65 break;
#ucOjdquq }
`*~:nvU }
v&?Bqj return bAdded;
& XrV[d[> }
!|`YNsR //删除热键
un\"1RdO BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
9(H8MUF0{ {
LN7;Yr BOOL bRemoved=FALSE;
Gd'^vqo< for(int index=0;index<MAX_KEY;index++){
)`U T#5 if(hCallWnd[index]==hWnd){
."h;H^5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
A5nu`e9& hCallWnd[index]=NULL;
?$o8=h HotKey[index]=0;
i=SX_#b^ HotKeyMask[index]=0;
*M8 4Dry`y bRemoved=TRUE;
jm*v0kNy KeyCount--;
D}_\oE/n break;
PPmZ[N9(; }
$y`|zK|G- }
{UwJg }
Xe*
L^8+ return bRemoved;
aUJ& }
uT=sDWD: PAqziq. dLo%+V#/A DLL中的钩子函数如下:
w%L0mH2]ng ; xs?^N| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{E@@14]g {
$<T)_g BOOL bProcessed=FALSE;
[.0R"|$sy+ if(HC_ACTION==nCode)
4}l,|7_&I {
3J@#V ' if((lParam&0xc0000000)==0xc0000000){// 有键松开
zf^!Zqn[8z switch(wParam)
Gd"lB*^Ht {
E|Z Y2&J`4 case VK_MENU:
}G-qOt MaskBits&=~ALTBIT;
%Uuhi&PA-l break;
mWO=(}Fb\ case VK_CONTROL:
\24neD4cM@ MaskBits&=~CTRLBIT;
{U&Mo97rzX break;
N=|w]t0*yc case VK_SHIFT:
%1e`R*I MaskBits&=~SHIFTBIT;
koaH31Q break;
`<[Zs]Fe4 default: //judge the key and send message
P 0,]Ud break;
jp2l}C }
>j\zj] -" for(int index=0;index<MAX_KEY;index++){
X8Gw8^t if(hCallWnd[index]==NULL)
Tqm9><!r continue;
Kf(% aDYq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1{"e'[L {
CK.Z-_M SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*}yW8i}36 bProcessed=TRUE;
e}aD<EG }
dpTap<Noby }
:#b[gWl0Ru }
+dR$;!WB3 else if((lParam&0xc000ffff)==1){ //有键按下
011 _(v switch(wParam)
.lRO;D {
T w/CJg
case VK_MENU:
u},<On MaskBits|=ALTBIT;
t?{E_70W break;
AnI ENJ case VK_CONTROL:
TB1 1crE MaskBits|=CTRLBIT;
3+Xz5>"a break;
8`'_ckIgr case VK_SHIFT:
{8b6A~/ MaskBits|=SHIFTBIT;
1\_4# @') break;
'ApWYt default: //judge the key and send message
5AQ $xm4 break;
t5[{ihv~: }
HOXqIZN85 for(int index=0;index<MAX_KEY;index++){
c_&iGQ if(hCallWnd[index]==NULL)
k1B7uA'h"G continue;
2I6 c7H s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
KJJ8P`Kx {
8h-6;x^^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
F|Jo|02 bProcessed=TRUE;
/.Gx
n0 }
aRg-
rz }
0=7C-A1(D }
wGAN"K:e if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
'szkn0 for(int index=0;index<MAX_KEY;index++){
Uu8Z2M if(hCallWnd[index]==NULL)
a&4>xZU # continue;
aCy2.Qn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
rVFAwbR SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
L 'H1\'
o //lParam的意义可看MSDN中WM_KEYDOWN部分
T3+hxS }
I6h{S}2 }
M
HlP)' }
c:hOQZ return CallNextHookEx( hHook, nCode, wParam, lParam );
"k5 C? ~ }
d;H1B/ Y
KeOH 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
]%F3 xzOk O. @_2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ub./U@1 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4s.wQ2m xw]Zo<F 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
n"d~UV^Uw V'\4sPt LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2u/(Q># {
1,9RfY V if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
J1P82=$, {
C`7HC2Is //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
FHqa|4Ie SaveBmp();
"kVN|Do return FALSE;
B5P++aQ }
ayHI(4!$j …… //其它处理及默认处理
Ui'~d(F }
$A8eMJEpL h$4V5V |4x&f!%m 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。
boJQ3Xc <o^mQq& 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。
uWv l<{2 Y-7x**I 二、编程步骤
5/>G)& a(BWV?A 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";
BDD^*Y >LwAG:Ud 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
=KMd! $J\ Vy&F{T;$ 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;
%t:1)]2 VOp8 ,! 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;
7Ja^d-F7 hRtnO|Z6 5、 添加代码,编译运行程序。
%pe7[/ KvkiwO( 三、程序代码
f.Q?-M =+A8s$Pb ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
?gH[tN:= #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
b>&kL #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
U_Emp[ #if _MSC_VER > 1000
:q0C$xF #pragma once
Hg*6I%D[So #endif // _MSC_VER > 1000
sW@4r/F>:D #ifndef __AFXWIN_H__
i!ejK6Q #error include 'stdafx.h' before including this file for PCH
3[-L'!pOX3 #endif
-QI1>7sl #include "resource.h" // main symbols
J[RQF54qA{ class CHookApp : public CWinApp
FwmE1, {
)TVyRY Z1 public:
Bn-%).-ED CHookApp();
a~:'OW:Q // Overrides
X;6&:%ZL@^ // ClassWizard generated virtual function overrides
)I$_wB!UV //{{AFX_VIRTUAL(CHookApp)
u` R public:
c
R[DT04 virtual BOOL InitInstance();
V~NS<!+q virtual int ExitInstance();
y=G //}}AFX_VIRTUAL
&HT
PeB //{{AFX_MSG(CHookApp)
|A[Le
;, // NOTE - the ClassWizard will add and remove member functions here.
rnEWTk7& // DO NOT EDIT what you see in these blocks of generated code !
\62|w HX //}}AFX_MSG
pc:~_6S DECLARE_MESSAGE_MAP()
H [R|U };
ERCW5b[RT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
`?2S4lN/ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
CP["N(fF BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
,^`+mP BOOL InitHotkey();
y*2:(nI BOOL UnInit();
2{|
U #endif
ZMy,<wk SI4M<'fK //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
xBl}=M?Qu #include "stdafx.h"
s-3vp #include "hook.h"
s@K|zOx #include <windowsx.h>
J XbG|L #ifdef _DEBUG
x_s9DkX #define new DEBUG_NEW
GbBcC#0 #undef THIS_FILE
P)7SK&]r;= static char THIS_FILE[] = __FILE__;
G#
.z((Rj #endif
=Pd3SC})6V #define MAX_KEY 100
l"*zr ;# #define CTRLBIT 0x04
ikw_t? #define ALTBIT 0x02
#q6jE #define SHIFTBIT 0x01
G\=7d%T+ #pragma data_seg("shareddata")
r@/+ HHOOK hHook =NULL;
Ip|~j}
} UINT nHookCount =0;
!QSL8v@c static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
PL%U static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
3.xsCcmP static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
F
MHpa static int KeyCount =0;
N0vr>e` static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
L|u\3.: #pragma data_seg()
q~T*R<S HINSTANCE hins;
BwEO2a{ void VerifyWindow();
l _dWS9 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
=j#uH`jgW //{{AFX_MSG_MAP(CHookApp)
&) T5V // NOTE - the ClassWizard will add and remove mapping macros here.
'W@X139zq // DO NOT EDIT what you see in these blocks of generated code!
e)zE*9 //}}AFX_MSG_MAP
L(fOe3
v END_MESSAGE_MAP()
bd5\Rt hV)D,oN3 CHookApp::CHookApp()
pW 2NrBq@w {
iT227v!s // TODO: add construction code here,
O@ F0UM`! // Place all significant initialization in InitInstance
RpOGY{[)[ }
y
U
=) g *GH`u*C_ CHookApp theApp;
iV58 m LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
SDwTGQ/0 {
+vIpt{733 BOOL bProcessed=FALSE;
.D!0$W mOZ if(HC_ACTION==nCode)
ZUVA EH% {
l_P-j96WD if((lParam&0xc0000000)==0xc0000000){// Key up
{*0<T|<n switch(wParam)
w)kNkD {
dZ rAn case VK_MENU:
aqRhh=iS MaskBits&=~ALTBIT;
yp KUkH/ break;
hb zC#@q case VK_CONTROL:
wKZ$iGMbz MaskBits&=~CTRLBIT;
`\T]ej}zvI break;
\>:CvTzF case VK_SHIFT:
x(etb<!jd MaskBits&=~SHIFTBIT;
#{?PbBE} break;
P9^-6;'Y default: //judge the key and send message
trPAYa}W break;
FbaEB RM }
}=gx# for(int index=0;index<MAX_KEY;index++){
\O*-#} ~\ if(hCallWnd[index]==NULL)
TcjEcMw, continue;
Hfwq/Is if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.S(TxksCz {
cZB7fmq% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Ne8Cgp bProcessed=TRUE;
M dZ&A}S }
3D!5T8 @ }
AsAT_yv# }
4wa`<H&S5 else if((lParam&0xc000ffff)==1){ //Key down
QDs^Ije switch(wParam)
Z:,U]Z( {
5p<ItU$pnL case VK_MENU:
qq) rd MaskBits|=ALTBIT;
y#Fv+`YDl break;
Rn`x7(WA case VK_CONTROL:
b$ve sJ MaskBits|=CTRLBIT;
WG6FQAo^8 break;
W-x?:X<} case VK_SHIFT:
\
e\?I9 MaskBits|=SHIFTBIT;
{sihus#Q break;
WHsgjvh" default: //judge the key and send message
r=5{o1" break;
;>
_$` }
1rv)&tKs for(int index=0;index<MAX_KEY;index++)
_LMM,!f {
P<l&0dPO8 if(hCallWnd[index]==NULL)
pP*zq"o continue;
]ndvt[4L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
QrB@cK] {
<,Ue
0 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,TXTS*V? bProcessed=TRUE;
TD'L'm|2 }
0Sle
}
&u /Nf&A }
u.mJQDTH if(!bProcessed){
lsNrAA%m for(int index=0;index<MAX_KEY;index++){
zm]aU`j if(hCallWnd[index]==NULL)
LQtj~c>X-| continue;
UUzYbuS>&l if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
wF <n= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9z}uc@#D=m }
73V|6tmgY }
2"Ecd }
\R|4( +]x return CallNextHookEx( hHook, nCode, wParam, lParam );
gZLP\_CL }
.q
`Hjmg< ZAv,*5&< BOOL InitHotkey()
G?EoPh^m {
Gnfd;.
(. if(hHook!=NULL){
^cczJOxB nHookCount++;
P%{^ i] return TRUE;
bn^{c }
Pa{%\dsv else
uT}' Y)m hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]z l[H7 if(hHook!=NULL)
n` xR5!de nHookCount++;
Qa.<K{m#? return (hHook!=NULL);
7w'wjX- }
-i)ZQCE BOOL UnInit()
ptDY3n~' {
RLbKD> if(nHookCount>1){
X:6c}p%,! nHookCount--;
2Ou[u#H return TRUE;
-7S g62THS }
a"FCZ.O1 BOOL unhooked = UnhookWindowsHookEx(hHook);
UD8op]>L if(unhooked==TRUE){
D@Vt^_ nHookCount=0;
e6d<dXx hHook=NULL;
5[A@gw0u }
K{[%7AM return unhooked;
Zy o[(`y }
:/Q 8ELCs<xI BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
:a$\/E = {
+tVaBhd! BOOL bAdded=FALSE;
BaSZ71>9]r for(int index=0;index<MAX_KEY;index++){
SzjkI+-$: if(hCallWnd[index]==0){
DV _2P$tT| hCallWnd[index]=hWnd;
DpUbzr41+k HotKey[index]=cKey;
Fxm$9(Y HotKeyMask[index]=cMask;
w)Q0_2p. bAdded=TRUE;
(+B5|_xQu KeyCount++;
gLy&esJl1 break;
qWODs }
CitDm1DXt/ }
Kac' ;1 return bAdded;
^~3SSLS4" }
W3 'q\+ %`r?c<P} BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
UPG9)aF {
\4v]7SV BOOL bRemoved=FALSE;
JwAYG5W for(int index=0;index<MAX_KEY;index++){
Ib+Y~
XYR if(hCallWnd[index]==hWnd){
qYlhlHD if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Kjs.L!W hCallWnd[index]=NULL;
jpO7'ivG HotKey[index]=0;
[uI|DUlI6o HotKeyMask[index]=0;
Y?(r3E^x bRemoved=TRUE;
aFS,GiB KeyCount--;
%k'!Iq+ break;
YgUvOyaQXf }
YbTxn="_ }
px}|Mu7z~ }
WJ4li@T7V return bRemoved;
[%77bv85.G }
cd$m25CxC "4uS3h2r void VerifyWindow()
0@H|n^Md# {
K95p>E`9e for(int i=0;i<MAX_KEY;i++){
my4giC2a if(hCallWnd
!=NULL){ FW/W%^
if(!IsWindow(hCallWnd)){ o]; [R
hCallWnd=NULL;
@I_8T$N=
HotKey=0; iZaI_\"__
HotKeyMask=0; 7z!tKs"TMT
KeyCount--; =jX8.K4]
} L1Iz<>
} S$Q8>u6Wk
} lzYnw)Pv
} 1oN^HG6O
+eFFSt
BOOL CHookApp::InitInstance()
FE2f'e
{ Axe8n1*y
AFX_MANAGE_STATE(AfxGetStaticModuleState()); W!?7D0q
hins=AfxGetInstanceHandle(); ]y,==1To
InitHotkey(); UG'9*(*
return CWinApp::InitInstance(); +(C6#R<LI
} uWM{JEOl
kX>f^U{j
int CHookApp::ExitInstance() pBETA'fY
{ 20Z8HwQi
VerifyWindow(); ]K/DY Do-
UnInit(); oE(7v7iY
return CWinApp::ExitInstance(); $aN&nhoO<
} "QWq_R
.8y3O]
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?zQA
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) OU/MiyP2
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _c,'>aH=
#if _MSC_VER > 1000 ,ztI,1"k
#pragma once s;64N'HH
#endif // _MSC_VER > 1000 R
+WP0&d'
V( -mD
class CCaptureDlg : public CDialog 'rr^2d]`ST
{ D,g1<:<
// Construction C\di 7 z:
public: XwlbJ=mf
BOOL bTray; I+dbZBX
BOOL bRegistered; '*?WU_L(g
BOOL RegisterHotkey(); 9Iz%ht
UCHAR cKey; 3Ei5pX =g
UCHAR cMask; |j VM&R2s
void DeleteIcon(); T+<A`k: -
void AddIcon(); y^}6!>Ou:
UINT nCount; cdG|m[
void SaveBmp(); iTV) NsC}
CCaptureDlg(CWnd* pParent = NULL); // standard constructor d\ ~QBr?
// Dialog Data :P@rkT3Q t
//{{AFX_DATA(CCaptureDlg)
NsJ(`zk:
enum { IDD = IDD_CAPTURE_DIALOG }; k:#P|z$UD
CComboBox m_Key; CJXg@\\/
BOOL m_bControl; !V,{_(LT
BOOL m_bAlt; 'I /aboDB
BOOL m_bShift; N1}={yF.fQ
CString m_Path; 9 `w)
CString m_Number; [w&$| h:;
//}}AFX_DATA (>I`{9x>6
// ClassWizard generated virtual function overrides gW1b~(
fD
//{{AFX_VIRTUAL(CCaptureDlg) w&B#goS
public: d GFGr}&s
virtual BOOL PreTranslateMessage(MSG* pMsg); ^+m+zd_
protected: j~e;DO
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rJ!{/3e
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )h8\u_U
//}}AFX_VIRTUAL \0H's{uek
// Implementation 't9hXzAfW
protected: !DI{:I_h(
HICON m_hIcon; Z+StB15
// Generated message map functions NSFs\a@1
//{{AFX_MSG(CCaptureDlg) .LuB\o$
virtual BOOL OnInitDialog(); -pE(_
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Cc, `}SP
afx_msg void OnPaint(); =Odv8yhn
afx_msg HCURSOR OnQueryDragIcon(); j$TwL;
virtual void OnCancel(); A,)VM9M_l
afx_msg void OnAbout(); _C+b]r/E
afx_msg void OnBrowse(); bug
Ot7
afx_msg void OnChange(); Izv+i*(dl
//}}AFX_MSG l?q%?v8
DECLARE_MESSAGE_MAP() }h}<!s
}; W7\&~IWub
#endif )#}mH @
G5,~Z&}YS
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wfP5@ !I
#include "stdafx.h" q;:6_Qr
#include "Capture.h" /^ " 83?_
#include "CaptureDlg.h" gn{=%`[
#include <windowsx.h> "aFhkPdWn
#pragma comment(lib,"hook.lib") F>X-w+b4r
#ifdef _DEBUG P/ oXDI8
#define new DEBUG_NEW `+/H^
#undef THIS_FILE u?[ q=0.J7
static char THIS_FILE[] = __FILE__; o1/lZm{\~n
#endif D r9 ?2
#define IDM_SHELL WM_USER+1 olW|$?
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x5Z-{"
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $) 5Bf3P0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $j5,%\4<
class CAboutDlg : public CDialog j2Pn<0U
{ nCKbgM'"
public: >l+EJ3W
CAboutDlg(); =9LC<2
// Dialog Data PjIeZ&p
//{{AFX_DATA(CAboutDlg) <q,+ON\'
enum { IDD = IDD_ABOUTBOX }; 2Nj9U#A
//}}AFX_DATA K$
v"Uk
// ClassWizard generated virtual function overrides do-c1;M
//{{AFX_VIRTUAL(CAboutDlg) ZE`lr+_Y
protected: ?'r9"M>
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t+nRw?Z
//}}AFX_VIRTUAL 8)VgS&B~
// Implementation 3qQUpm+
protected: ba@=^Fa;
//{{AFX_MSG(CAboutDlg) C#w]4 $/
//}}AFX_MSG LjdYsai-
DECLARE_MESSAGE_MAP() w G8Wez%
}; YGsS4ia*4i
`Vq`z]}
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) o/,NG U
{ IB|]fzy
//{{AFX_DATA_INIT(CAboutDlg) uvA(Rn
//}}AFX_DATA_INIT 'xFYUU]#T^
} &gc`<kLu
RH~3M0'0
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :o"8MZp
{ cywg[
CDialog::DoDataExchange(pDX); l>v{
//{{AFX_DATA_MAP(CAboutDlg) 50a\e
//}}AFX_DATA_MAP <E\V`g
} dZ:r&Qa
ODf4+& u
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v.W{x?5
//{{AFX_MSG_MAP(CAboutDlg) :G)<}j"sM
// No message handlers ,M3z!=oIGn
//}}AFX_MSG_MAP H:a|x#"
END_MESSAGE_MAP() ' eO/PnYW
!k~z5z'=py
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 2r];V'r
: CDialog(CCaptureDlg::IDD, pParent) sXl ??UGe
{ ,2 WH/"
//{{AFX_DATA_INIT(CCaptureDlg) ^ua12f
m_bControl = FALSE; ykq'g|
m_bAlt = FALSE; ^Y^"'"
m_bShift = FALSE; OR+A_:c.D
m_Path = _T("c:\\"); 6T^lS^
m_Number = _T("0 picture captured."); J-J3=JG
nCount=0; LD+f'^>>Z
bRegistered=FALSE; Kla:e[{
bTray=FALSE; !Y;<:zx5
//}}AFX_DATA_INIT 8.I9}_
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =sQ(iso%f
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~Sy-gaJ
} j$eCe<.3
L2Ux9_S
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [Hcaw
{ '7nJb6V,0l
CDialog::DoDataExchange(pDX); Sa]mm/G
//{{AFX_DATA_MAP(CCaptureDlg) v`{:~q*
DDX_Control(pDX, IDC_KEY, m_Key); a@|.;#FF
DDX_Check(pDX, IDC_CONTROL, m_bControl); o_yRn16
DDX_Check(pDX, IDC_ALT, m_bAlt); R!{7OkC
DDX_Check(pDX, IDC_SHIFT, m_bShift); 0~xaUM`
DDX_Text(pDX, IDC_PATH, m_Path); |vy]8?Ak
DDX_Text(pDX, IDC_NUMBER, m_Number); Js}tZ\+P75
//}}AFX_DATA_MAP ^`&HWp
} ",Wf uz
R^9"N?Q7;`
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F7uhuqA]N
//{{AFX_MSG_MAP(CCaptureDlg) }%{=].)L
ON_WM_SYSCOMMAND() spiDm:Xe
ON_WM_PAINT() >5i ?JUZ
ON_WM_QUERYDRAGICON() aBCOGtf
ON_BN_CLICKED(ID_ABOUT, OnAbout) silp<13HN
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) #v qz{R~nM
ON_BN_CLICKED(ID_CHANGE, OnChange) -IvL+}K
//}}AFX_MSG_MAP sM9-0A
END_MESSAGE_MAP() S 1ibw \'
jI#z/a!j:
BOOL CCaptureDlg::OnInitDialog() |B1Af
{ h]C2 8=N
CDialog::OnInitDialog(); B_@7IbB
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )b (X
ASSERT(IDM_ABOUTBOX < 0xF000); aa=b<Cd
CMenu* pSysMenu = GetSystemMenu(FALSE); 8g5.7{ky
if (pSysMenu != NULL) 0(vdkC4\A
{ )GCLK<,swu
CString strAboutMenu; iJ*%dio
strAboutMenu.LoadString(IDS_ABOUTBOX); akrCs&Kka5
if (!strAboutMenu.IsEmpty()) Rc%PZ}es
{ 8a!2zwUBV
pSysMenu->AppendMenu(MF_SEPARATOR); O &\<F T5
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [5pn@o
} L3>4t: 8
} #?5VsD8
SetIcon(m_hIcon, TRUE); // Set big icon Pd&,G$l
SetIcon(m_hIcon, FALSE); // Set small icon s|p(KWo2U
m_Key.SetCurSel(0); Q5T(nEA
RegisterHotkey(); M->Kz{h?j
CMenu* pMenu=GetSystemMenu(FALSE); _6/Qp`s
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R''Sfz>8
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^1vq{/ X
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *q[^Q'jnN
return TRUE; // return TRUE unless you set the focus to a control 'U*udkn 2]
} # m_\1&g
`;T?9n
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) MSFNw
{ 2"_ 18l.
if ((nID & 0xFFF0) == IDM_ABOUTBOX) H;X~<WN&AW
{ .>a$g7Rj
CAboutDlg dlgAbout; i|[S5QXCh
dlgAbout.DoModal(); hXBqz9
} }"g@E-]N
else M`q#,Y?3^I
{ cRPr9LfD@
CDialog::OnSysCommand(nID, lParam); )8\Z=uC
} t>=GVu^
} I *1#
Yr Preuh
void CCaptureDlg::OnPaint() s')!<E+z\t
{ ;9
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if (IsIconic()) w 2s,
{ &<m
WA]cAL
CPaintDC dc(this); // device context for painting fdvi}SS8
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QZ_nQ3K
// Center icon in client rectangle g(M(Hn7
int cxIcon = GetSystemMetrics(SM_CXICON); p3i
qW,[@
int cyIcon = GetSystemMetrics(SM_CYICON); ]ZBgE\[
CRect rect; `7+tPbjs
GetClientRect(&rect); O7E;W| ]
int x = (rect.Width() - cxIcon + 1) / 2; h%4~0
int y = (rect.Height() - cyIcon + 1) / 2; ,|=iv
// Draw the icon >0[qi1
dc.DrawIcon(x, y, m_hIcon); _AA`R`p;
} u9da]*\7y
else Y>c5:F;
{ JB: mbH
CDialog::OnPaint(); j>0SE
} 5k_Mj*{6
} GN8`xR{J*
V~tu<"%
HCURSOR CCaptureDlg::OnQueryDragIcon() aa'0EU:
{ =D;UMSf
return (HCURSOR) m_hIcon; ZnxOa
} _,Io(QS
M]pel\{M
void CCaptureDlg::OnCancel() k
N
uN4/
{ +$Ddd`J'
if(bTray) SvCK;$:
DeleteIcon(); =[O<.'aG-
CDialog::OnCancel(); >(YPkmH
} <'+R%6
bE%mgaOh
void CCaptureDlg::OnAbout() ph5xW<VNP
{ B_6v'=7]
CAboutDlg dlg; '44nk(hM69
dlg.DoModal(); bsmoLT
} B "s8i{Vm
hBs>2u|z9
void CCaptureDlg::OnBrowse() UO7a}Tz<
{ ~,3v<A[5Vi
CString str; y("0Xve
BROWSEINFO bi; M<|~MR
char name[MAX_PATH]; jd*%.FDi{
ZeroMemory(&bi,sizeof(BROWSEINFO)); |4 d{X@`&
bi.hwndOwner=GetSafeHwnd(); {/[?YTDU
bi.pszDisplayName=name; McMK|_H
bi.lpszTitle="Select folder"; K:Xrfn{s
bi.ulFlags=BIF_RETURNONLYFSDIRS; 2+G:04eS,e
LPITEMIDLIST idl=SHBrowseForFolder(&bi); P*qNRP%
if(idl==NULL) 1x<rh\oo
return; ~QQ23k&
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "Jv,QTIcS
str.ReleaseBuffer(); 2w.9Q
(Sn
m_Path=str; XC8z|A-@
if(str.GetAt(str.GetLength()-1)!='\\')
} C2i#;b
m_Path+="\\"; e|+;j}^C
UpdateData(FALSE); j~0ZE
-e
} 3B_} :
*fy`JC
void CCaptureDlg::SaveBmp() x /Ky:
Ky
{ uB)6\fkTB
CDC dc; cB"F1~z
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1V9X(uP
CBitmap bm; #5"<.z
int Width=GetSystemMetrics(SM_CXSCREEN); N55=&-p
int Height=GetSystemMetrics(SM_CYSCREEN); Pc-8L]2oaF
bm.CreateCompatibleBitmap(&dc,Width,Height); 7!840 :a?+
CDC tdc; E*b[.vUp
tdc.CreateCompatibleDC(&dc); ;[\2/$-
CBitmap*pOld=tdc.SelectObject(&bm); TD=/C|
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); })u}PQ
tdc.SelectObject(pOld); m
?tnk?oX
BITMAP btm; KUqS(u
bm.GetBitmap(&btm); zinl.8Uk
DWORD size=btm.bmWidthBytes*btm.bmHeight; l8d%hQVqT
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); u9^;~i,
BITMAPINFOHEADER bih; *B~:L"N
bih.biBitCount=btm.bmBitsPixel; |JQP7z6j]
bih.biClrImportant=0; TF3q?0
bih.biClrUsed=0; nR'EuI~(}
bih.biCompression=0; 7[<sl35
bih.biHeight=btm.bmHeight; 5dEO_1q
%
bih.biPlanes=1; 3#ZKuGg=
bih.biSize=sizeof(BITMAPINFOHEADER); [(UqPd$
bih.biSizeImage=size; xR6IXF>*
bih.biWidth=btm.bmWidth; qJzK8eW
bih.biXPelsPerMeter=0; eii7pbc
bih.biYPelsPerMeter=0; K?m:.ZM
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BRLU&@G`1
static int filecount=0; ]4~D;mv
CString name; %((3'le
name.Format("pict%04d.bmp",filecount++); zLK
~i>aW
name=m_Path+name; D>^ix[:J
BITMAPFILEHEADER bfh; 3E@&wpj
bfh.bfReserved1=bfh.bfReserved2=0; )Nd:PnA
bfh.bfType=((WORD)('M'<< 8)|'B'); nt`l6b
bfh.bfSize=54+size; SF=|++b1f
bfh.bfOffBits=54; X}FF4jE]D(
CFile bf; @Iatlz*W
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hQxe0Pdt
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bUB6B
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Us]=Y}(
bf.WriteHuge(lpData,size); 5X#E@3g5
bf.Close(); sef]>q
nCount++; Huc|6~X
} 49AW6H.JT
GlobalFreePtr(lpData); 8#w)X/
if(nCount==1) k[%aCGo
m_Number.Format("%d picture captured.",nCount); 7VAJJv3
else {WQq}-(
m_Number.Format("%d pictures captured.",nCount); YHB9mZi
UpdateData(FALSE); 0OnV0SIL
} :Wc_Utt
`:p1&OS
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) MG{l~|\x)
{ ,$N#Us(Wa
if(pMsg -> message == WM_KEYDOWN) x6W`hpL
{ GSi>l,y'
if(pMsg -> wParam == VK_ESCAPE) vcv CD7MD
return TRUE; B$XwTJ>
if(pMsg -> wParam == VK_RETURN) ~e-z,:Af
return TRUE; Jxa4hM0
} hr/o<#OW
return CDialog::PreTranslateMessage(pMsg); /TV=$gB`
} wNYg$d0M
r@kP*
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Z6Fp\aI8@
{ ]PR#W_&q
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?6"{!s{v
SaveBmp(); 4<gb36)|4
return FALSE; ,R2U`EO;
} y >+mc7n
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pw[g
CMenu pop; 2oCkG~j
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aG%,cQ 1
CMenu*pMenu=pop.GetSubMenu(0); y7)(LQRE
{
pMenu->SetDefaultItem(ID_EXITICON); ;j%BK(5
CPoint pt; >V$ Gx>I
GetCursorPos(&pt); ~}"]&%Q{J
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gckI.[!b
if(id==ID_EXITICON) y[?-@7i
DeleteIcon(); {d<;BLA
else if(id==ID_EXIT) n, i'Dhzk
OnCancel(); 8|%^3O 0X
return FALSE; 2RM+W2!!
} O"G >wv
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 04U")-\O
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /JkC+7H4
AddIcon(); VQ#3#Hj
return res; 3?n>yS
} T r0B[QF
Pr ]Ka
void CCaptureDlg::AddIcon() \QE)m<GUe
{ Q[F}r`
NOTIFYICONDATA data; re?s.djT
data.cbSize=sizeof(NOTIFYICONDATA); UMl#D>:C<
CString tip; kn"(mJe$
tip.LoadString(IDS_ICONTIP); 6GPp>X
data.hIcon=GetIcon(0); $-}e; V Zb
data.hWnd=GetSafeHwnd(); 4k-+?L!/G
strcpy(data.szTip,tip); mE%$HZ}
data.uCallbackMessage=IDM_SHELL; a2Pf/D]n
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y\dEk:\)
data.uID=98; .
\
Shell_NotifyIcon(NIM_ADD,&data); sm[94,26
ShowWindow(SW_HIDE); s, k
bTray=TRUE; h\v'9
} W"^wnGa@a
X3'H
`/
void CCaptureDlg::DeleteIcon() r}[7x]sP
{ EI!6MC)
NOTIFYICONDATA data; PxH72hBS
data.cbSize=sizeof(NOTIFYICONDATA); JRo?s~Ih
data.hWnd=GetSafeHwnd(); $/!{OU.t`
data.uID=98; w?kJ+lmOQy
Shell_NotifyIcon(NIM_DELETE,&data); #Zrlp.M4
ShowWindow(SW_SHOW); gUyR_5q)8l
SetForegroundWindow(); J{^RkGF
ShowWindow(SW_SHOWNORMAL); rV08ad
bTray=FALSE; ys 5&PZg*
} (Jz;W<E
i[wb0yL
void CCaptureDlg::OnChange() q.,JVGMS
{ |2{wG4
RegisterHotkey(); 8Q_SRwN
} \=_{na_
o=0]el^A
BOOL CCaptureDlg::RegisterHotkey() /0Ax*919j
{ S)DnPjN{
UpdateData(); \7CGUB>L
UCHAR mask=0; As>_J=8} 3
UCHAR key=0; OpHsob~
if(m_bControl) fW?o@vlO
mask|=4; y*X_T,K8
if(m_bAlt) n=[/Z!
mask|=2; l+V>]?j
if(m_bShift) BCA&mi3q
mask|=1; hP15qKy
key=Key_Table[m_Key.GetCurSel()]; ynbuN x*
if(bRegistered){ wiiCd
DeleteHotkey(GetSafeHwnd(),cKey,cMask); R=jI?p
bRegistered=FALSE; jYKor7KTqT
} z*-2.}&U<
cMask=mask; <_7*67{
cKey=key; >3Eo@J,?d
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kBffF@{
return bRegistered;
P
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} Y=Kc'x[,Zj
jbAx;Xt'=M
四、小结 pej|!oX
MjU6/pO}L
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。