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:
}?b\/l<
DKo6lP` 一、实现方法
{?
yRO] C\rT'!Uk\Q 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:
Zy Df@(z` ; 8VZsh #pragma data_seg("shareddata")
`?:{aOI HHOOK hHook =NULL; //钩子句柄
[/ CB1//Y UINT nHookCount =0; //挂接的程序数目
va~:Ivl-) static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
7|Vpk&.> static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
)YCH>Za static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
r<]^.]3zj static int KeyCount =0;
Y&VypZ"G> static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
y;0Zk~R$ #pragma data_seg()
mj9|q8v{+ Z$0mKw 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
HH*,Oe XffHF^l9F DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
yR F+ `zs@W
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
=PU@'OG cKey,UCHAR cMask)
wV-N\5!r%H {
5Bcmz'?! BOOL bAdded=FALSE;
qoan<z7 for(int index=0;index<MAX_KEY;index++){
`U?S 9m if(hCallWnd[index]==0){
mGz'%?zj hCallWnd[index]=hWnd;
4YOLy\"S HotKey[index]=cKey;
X"8$,\wX, HotKeyMask[index]=cMask;
<q MX,h2 bAdded=TRUE;
NVVAh5R KeyCount++;
u 'ng'j' break;
)`=N+k] }
Q2|6W E }
D9(4%^HxV1 return bAdded;
uPFbKSJj }
48gpXcc@| //删除热键
VQ~eg wJL BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
I%?M9y.u6 {
1_~'?'&^ BOOL bRemoved=FALSE;
PC=s:`Y}R for(int index=0;index<MAX_KEY;index++){
PVKq&Q? if(hCallWnd[index]==hWnd){
Kd#64NSi$A if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
PHsM)V+ hCallWnd[index]=NULL;
B_r:da CS: HotKey[index]=0;
4yu=e;C wy HotKeyMask[index]=0;
RplcM%YJn bRemoved=TRUE;
kSJ:4! lFU KeyCount--;
Rlr[uU_ break;
Yv*i69" }
xoSBMf }
6yaWxpW }
4[0.M return bRemoved;
)sEAPIka }
8W.-Y|[5? z ISy\uka /Wjf"dG} DLL中的钩子函数如下:
<
Lrd(b; ^-}3+YA LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
lZ+1A0e {
.b%mr:nEt7 BOOL bProcessed=FALSE;
oRn 5blj if(HC_ACTION==nCode)
gn 9CZ {
yErvgf if((lParam&0xc0000000)==0xc0000000){// 有键松开
'bef3P9` switch(wParam)
KbRKPA` {
v^IMN3^W case VK_MENU:
Yh% MaskBits&=~ALTBIT;
@iz6)2z break;
87VXVI case VK_CONTROL:
`tsqnw MaskBits&=~CTRLBIT;
ku5g`ho break;
"%t !+E>nr case VK_SHIFT:
P[cGCmM MaskBits&=~SHIFTBIT;
*u<@_Oa break;
"jl`FAu)q default: //judge the key and send message
3TD!3p8 break;
E<_+Tc }
!I8(Y for(int index=0;index<MAX_KEY;index++){
$r)nvf`\ if(hCallWnd[index]==NULL)
64!V8&Ay continue;
!91<K{#A{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]_)=xF19 {
Lop=._W SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
VM
ny>g&3 bProcessed=TRUE;
T|nN. }
qo;F]v*pkK }
Z$@ XMq! }
|Oaj
Jux else if((lParam&0xc000ffff)==1){ //有键按下
]| =#FFz switch(wParam)
2TC7${^9}J {
=HvLuVc case VK_MENU:
F9SIC7}uH MaskBits|=ALTBIT;
d7QQ5FiB break;
4VL]v9 case VK_CONTROL:
xZ"kJ'C4} MaskBits|=CTRLBIT;
t#g6rh& break;
4fzM%ku case VK_SHIFT:
Ib4 8` MaskBits|=SHIFTBIT;
$VJ=A< break;
<$;fOp default: //judge the key and send message
8>jd2'v{ break;
Y-,1&$& }
0 g(hY: for(int index=0;index<MAX_KEY;index++){
)%OV|\5# if(hCallWnd[index]==NULL)
6{I5 23g continue;
ZGOI8M]@ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7"
cgj# {
RT2a:3f SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Vi>kK|\b bProcessed=TRUE;
@{n2R3)k
B }
58My6(5y }
<BN)>NqM }
/SD2e@x{U if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
:XZ for(int index=0;index<MAX_KEY;index++){
Ad7=JzV if(hCallWnd[index]==NULL)
5G=CvGu continue;
Hv>Hz*s_I if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
BO ^T
: SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
=l3*{ ?G //lParam的意义可看MSDN中WM_KEYDOWN部分
UIv
2wA2 }
Z-j%``I?h }
\h"QgHzp }
Z5{M_^ return CallNextHookEx( hHook, nCode, wParam, lParam );
MgLz:2
:F }
qx/GioPU
/m*vY` 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
*K\/5Fzl UkL'h&J~ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
3C8'@-U BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Z,,Wo
%)o r,b-c 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
(#.)~poZ /$x6//0If LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
18!0Hl> {
lBTgI"n=eK if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
D`.CXFI+U {
Efw/bTEg //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
|^@TA=_ SaveBmp();
o0Hh&:6!M return FALSE;
aARm nV }
EY!aiH6P …… //其它处理及默认处理
fr\UX}o }
@,sg^KB !/$BXUrd 5,qfr!hN, 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
,[^P X;p,Wq#D' 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
PHD$E s 4oOe 二、编程步骤
_Oq (&I g!%csf 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";
c66Iy" :h3
Gk;u 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
VxfFk4 7z6y n=B 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;
c{#lKD<7 TZZqV8 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;
eGLLh_V" f.'o4HSj 5、 添加代码,编译运行程序。
./ib{ @A. diqG8KaK 三、程序代码
Qo{^jDe,c* }` ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
AC(}cMM+ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
=J?<M?ugf #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
4- 6' #if _MSC_VER > 1000
12E@9s$Z #pragma once
+2W#=G #endif // _MSC_VER > 1000
8'#%7+ "=! #ifndef __AFXWIN_H__
R{6.O+j` #error include 'stdafx.h' before including this file for PCH
Mi'eViH #endif
.'7o,)pJ< #include "resource.h" // main symbols
'L0 2lM class CHookApp : public CWinApp
<v[,A8Q {
S3j/(BG public:
M* QqiE CHookApp();
kAbT&Rm" // Overrides
0 x"3 // ClassWizard generated virtual function overrides
f+$/gz //{{AFX_VIRTUAL(CHookApp)
M6|Q~8$ public:
NCSb`SC: virtual BOOL InitInstance();
.f&,~$e4 virtual int ExitInstance();
I[<C)IG //}}AFX_VIRTUAL
35jP</ //{{AFX_MSG(CHookApp)
sOLo[5y' // NOTE - the ClassWizard will add and remove member functions here.
R`>E_SY // DO NOT EDIT what you see in these blocks of generated code !
[N#2uo //}}AFX_MSG
Cg21-G. DECLARE_MESSAGE_MAP()
UXa3>q> };
(g~&$&pa LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
n&[U/`o BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-_pI:K[ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
m2<sVTN`^ BOOL InitHotkey();
;Cyt2]F BOOL UnInit();
w>VM-- #endif
-oe&1RrdVg
D[]vJ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
oOe5IczS( #include "stdafx.h"
/k}vm3 #include "hook.h"
%t%+;(M9 #include <windowsx.h>
b9w9M&?fT #ifdef _DEBUG
p#J}@a #define new DEBUG_NEW
O,xU+j~) #undef THIS_FILE
]rHdG^0uss static char THIS_FILE[] = __FILE__;
se$GE:hC1Q #endif
"vjz $. #define MAX_KEY 100
}e9:2 #define CTRLBIT 0x04
R[Kyq|UyVr #define ALTBIT 0x02
KH2a 2 #define SHIFTBIT 0x01
^i#q{@g #pragma data_seg("shareddata")
&Cdk%@Tj]B HHOOK hHook =NULL;
~c3!,C UINT nHookCount =0;
P7"g/j" " static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
k9WihejS static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
T6-e static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
YJXh|@LT static int KeyCount =0;
7PP76$ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
.wS' Xn& #pragma data_seg()
+<AX
0( HINSTANCE hins;
`;4zIBJ void VerifyWindow();
jcOxtDTSW BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
C8@SuJ //{{AFX_MSG_MAP(CHookApp)
;9 XM
s) // NOTE - the ClassWizard will add and remove mapping macros here.
CQzJ_aSJ( // DO NOT EDIT what you see in these blocks of generated code!
sRb)*p' //}}AFX_MSG_MAP
S1;#58 END_MESSAGE_MAP()
QSEf ) <^9` CHookApp::CHookApp()
(+bk +0 {
U{n
0Z // TODO: add construction code here,
SH5GW3\h // Place all significant initialization in InitInstance
xC!, v 0& }
f#/v^Ql* +vBq,'k` CHookApp theApp;
fkyj&M/ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
hU+sg~E {
i4v7x;m_p BOOL bProcessed=FALSE;
[D?RL`ZF if(HC_ACTION==nCode)
x"5/1b3aq {
*V3 }L
Z if((lParam&0xc0000000)==0xc0000000){// Key up
}N*6xr*X+ switch(wParam)
i@Q)`>4 {
{&"rv<p case VK_MENU:
-&D~TL# MaskBits&=~ALTBIT;
[|xHXcW break;
x:"_B case VK_CONTROL:
~%k<N/B MaskBits&=~CTRLBIT;
VGA?B@ break;
70a7}C\/o case VK_SHIFT:
"+r8izB MaskBits&=~SHIFTBIT;
Yep(,J~' break;
lySeq^y?Q default: //judge the key and send message
2\lUaC#E break;
RBJgQ<j8 }
'1|r+(q|2 for(int index=0;index<MAX_KEY;index++){
y7ijT='8 if(hCallWnd[index]==NULL)
m(XcPb continue;
X@5!I+u\L if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
XQ%*U=)s {
a@lvn/b2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
tlQ3BKp bProcessed=TRUE;
kdITh9nx<r }
S;MS,R }
d9sl(;r }
TJp( else if((lParam&0xc000ffff)==1){ //Key down
QrHI}r switch(wParam)
O:q 0- {
= %\;7 case VK_MENU:
o-_0 MaskBits|=ALTBIT;
>QU1_'1r break;
| wKZ-6 case VK_CONTROL:
|u<qbl MaskBits|=CTRLBIT;
2W~,,$
G break;
&M*&oi ( case VK_SHIFT:
}.$oZo9J MaskBits|=SHIFTBIT;
'|G_C%,B break;
e$4 5 OL default: //judge the key and send message
959&I0=g" break;
J}hi)k }
S`5^H~ for(int index=0;index<MAX_KEY;index++)
r,A750P^ {
b-@6w(j if(hCallWnd[index]==NULL)
e 9U\48 continue;
T8JM4F if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Gyw@+(l {
`QC{}Oo^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
5 b( [1*
bProcessed=TRUE;
\vs,$h }
6K5KZZG
}
1%G<gbHpI }
c1'OIK C if(!bProcessed){
<:W]u T for(int index=0;index<MAX_KEY;index++){
WhMr'l/e if(hCallWnd[index]==NULL)
\RnGKQ"4 continue;
-:Nowb if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
6I.N:)= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
u7UqN }
Yi1_oe }
2(YZTaY }
sf2_x>U1 return CallNextHookEx( hHook, nCode, wParam, lParam );
xiX~*Zs }
:G?"BL5vP C=t:0.:PJ BOOL InitHotkey()
-P]J:7*0?\ {
xV:.)Dq9 if(hHook!=NULL){
G9<pYt{: nHookCount++;
qN1(mxa.? return TRUE;
vHcB^Z }
eOt T* else
no?TEXp* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
f"~+mO if(hHook!=NULL)
+M/04 nHookCount++;
Z=_p return (hHook!=NULL);
\O/EY& }
i%GjtYjS BOOL UnInit()
:+|b7fF {
?"$W=*P\o if(nHookCount>1){
4d)w2t?H% nHookCount--;
L"rLalUw return TRUE;
if9I7@ }
`o8b\p\zn BOOL unhooked = UnhookWindowsHookEx(hHook);
a\$PqOB! if(unhooked==TRUE){
]F r+cP nHookCount=0;
i,NN" hHook=NULL;
N'+d1 }
y,tA~ return unhooked;
KFor~A# D }
&THM]3: 0|nvi=4~e| BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
/ZlW9| {
pM9Hav@iWU BOOL bAdded=FALSE;
mDC{c ? for(int index=0;index<MAX_KEY;index++){
J*F-tRuEw if(hCallWnd[index]==0){
y%Ui)UMnw] hCallWnd[index]=hWnd;
B08q/qi HotKey[index]=cKey;
#m1e_[ HotKeyMask[index]=cMask;
UB@>i3 bAdded=TRUE;
6|r`
k75. KeyCount++;
:
FF:{&d break;
wh
l)^D }
;Z:z'';Lm }
Sdz!J 1 return bAdded;
j0L9Q|s }
U5jY/e_ O$J'BnPpw BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
lY[>}L*H8 {
Ih!UL:Ckh BOOL bRemoved=FALSE;
[&k[k) for(int index=0;index<MAX_KEY;index++){
7
a !b} if(hCallWnd[index]==hWnd){
l"p%]\tZ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&STgj|t_ hCallWnd[index]=NULL;
O?L_9L* HotKey[index]=0;
B<
P H7 HotKeyMask[index]=0;
d~tG#<^` bRemoved=TRUE;
k[R/RhHQ, KeyCount--;
j )Zi4<./ break;
i >Hh_q;' }
"Nj(0& }
cpz}!D }
81V,yq] return bRemoved;
E,JDO d} }
>^ 0JlL`XG 8X][TJG$ void VerifyWindow()
aD8cqVhM3& {
#!u P>/ for(int i=0;i<MAX_KEY;i++){
)5_GJm&R9 if(hCallWnd
!=NULL){ Mcj4GjV6:"
if(!IsWindow(hCallWnd)){ FjRJSMwO,
hCallWnd=NULL; s<5q%5ix3
HotKey=0; T/p}Us
HotKeyMask=0; z{bMW^F
KeyCount--; S&}7jRH1
} ?`_US7.@
} h`Vb#5ik
} Yr-a8aSTE5
} 9~I\WjB
"
E^zgYkZO
BOOL CHookApp::InitInstance() ,RKBGOz?f
{ d%Jl9!u
AFX_MANAGE_STATE(AfxGetStaticModuleState()); kXzm
hins=AfxGetInstanceHandle(); #R4Mv(BG
InitHotkey(); :k6|-A2
return CWinApp::InitInstance(); A3*ti!X<6
} gF^l`1f"
MB"uJUk
int CHookApp::ExitInstance() okoD26tK
{ ji?0;2Y
VerifyWindow(); `* "u"7e
UnInit(); Yd~K\tX:n
return CWinApp::ExitInstance(); 25BW/23}e
} Q2cF++Q1
B)O=wx
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file NoO>CjeFb
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) l
" pCxA
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vP^]Y.6
#if _MSC_VER > 1000 d#Sc4xuf
#pragma once DalQ.
#endif // _MSC_VER > 1000 yA?>v'K
5#g<L ~
class CCaptureDlg : public CDialog fO[X<|9
{ `J[(Dx'y=t
// Construction G]E$U]=9r:
public: V.)y7B
BOOL bTray; @;qC% +^
BOOL bRegistered; (9*s:)zD-
BOOL RegisterHotkey(); @ \J R xJ
UCHAR cKey; /%po@Pm#I
UCHAR cMask; D%(9ot{!e
void DeleteIcon(); ^c83_93)R
void AddIcon(); bxyEn'vNvQ
UINT nCount; #pBAGm3
void SaveBmp(); @g9j+DcU
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2`+ ?s
// Dialog Data ZLyJ
//{{AFX_DATA(CCaptureDlg) =rl/l8|P
enum { IDD = IDD_CAPTURE_DIALOG }; Re5m
CComboBox m_Key; \ 3n{%\_
BOOL m_bControl; t;Jt+k~
BOOL m_bAlt; IJ!]1fXy+
BOOL m_bShift; |xZDc6HDW
CString m_Path; 33J}AK^FE
CString m_Number; 9-o{[
//}}AFX_DATA )b
m|],'
// ClassWizard generated virtual function overrides uYIw ?fXy
//{{AFX_VIRTUAL(CCaptureDlg) 1)/B V{n
public: v\rOs+.s
virtual BOOL PreTranslateMessage(MSG* pMsg); uEWW Y t
protected: +cvz
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GsqR8n=
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vVc:[i
//}}AFX_VIRTUAL 0t}=F4@&a
// Implementation [#V"a:8m}
protected: g-pDk*|I,Q
HICON m_hIcon; &FHE(7}/#
// Generated message map functions 8xj4N%PA
//{{AFX_MSG(CCaptureDlg) ,
M /-lW
virtual BOOL OnInitDialog(); pWSYbN+d
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 8H./@~_ =
afx_msg void OnPaint(); -))>7skc
afx_msg HCURSOR OnQueryDragIcon(); [POcO
virtual void OnCancel(); YP>VC(f
afx_msg void OnAbout(); &YO5N4X~o
afx_msg void OnBrowse(); j8zh^q
afx_msg void OnChange(); -?e~dLu
//}}AFX_MSG ~53E)ilB
DECLARE_MESSAGE_MAP() CEc&
G
}; ^8.R 'Yq
#endif Tr)a6Cf
(6u<w#u
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W0tBF&E"
#include "stdafx.h" 9r+ `j
#include "Capture.h" ?Ee?Ol?i2
#include "CaptureDlg.h" _S8]W
!c
#include <windowsx.h> Il2DZ5-
)
#pragma comment(lib,"hook.lib") -kES]P?2
#ifdef _DEBUG H`-%)c=
#define new DEBUG_NEW BT
98WR"\
#undef THIS_FILE t"2WJ-1k}
static char THIS_FILE[] = __FILE__; bVtboHlY
#endif l6xC'c,jg
#define IDM_SHELL WM_USER+1 =ADAMP
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I
m_yY
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m{mK;D
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +
h`:qB
class CAboutDlg : public CDialog yZxgUF&`
{ wz.Il-sm
public: 4I"QT(;
CAboutDlg(); EYGJDv(S
// Dialog Data TnL%_!V!
//{{AFX_DATA(CAboutDlg) MgHyKn'rL
enum { IDD = IDD_ABOUTBOX }; WaWT
5|A
//}}AFX_DATA ]j*o&6cQf
// ClassWizard generated virtual function overrides zVxiCyU
//{{AFX_VIRTUAL(CAboutDlg) [H0jDbN
protected: 1k2Ck
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vH#
US
//}}AFX_VIRTUAL "M7ry9dDH
// Implementation Lr)h>j6\
protected: hz Vpv,|G
//{{AFX_MSG(CAboutDlg) PHDKx+$
//}}AFX_MSG 3, ,Z
DECLARE_MESSAGE_MAP() $7TYix8=
}; uP|AP
GK95=?f~8;
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &BG^:4b
{ ~#I1!y~`
//{{AFX_DATA_INIT(CAboutDlg) ~W5fJd0
//}}AFX_DATA_INIT 4E4o=Z|K
} >m}.}g8
7*'_&0
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :b=`sUn<X+
{ s7FqE>#c0
CDialog::DoDataExchange(pDX); dAEz
hR[=
//{{AFX_DATA_MAP(CAboutDlg) /,Ln)?eD
//}}AFX_DATA_MAP ]_d(YHYf
} hx)Ed
KPW: r#d
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |t]-a%A=w
//{{AFX_MSG_MAP(CAboutDlg) 3(^9K2.s}
// No message handlers *2MUG
h
//}}AFX_MSG_MAP Q;m
.m2
END_MESSAGE_MAP() x18ei@c
&^9f)xb
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) cJ!wZT`
: CDialog(CCaptureDlg::IDD, pParent) 70HEu@-
{ }xLwv=Ia
//{{AFX_DATA_INIT(CCaptureDlg) 8k_,Hni
m_bControl = FALSE; SwC,=S
m_bAlt = FALSE; *sAoYx
m_bShift = FALSE; <6dD{{J]>p
m_Path = _T("c:\\"); jJ55Az?t:
m_Number = _T("0 picture captured."); v
bb mmv
nCount=0; 4$IPz7
bRegistered=FALSE; eqeVz`
bTray=FALSE; Nj#!L~^h,
//}}AFX_DATA_INIT CFul_qZ/e
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 htM5Nm[g
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >GT0x
} 0R_ZP12
OMKEn!Wq
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) J4`08,
{ 5uDQ*nJ|
CDialog::DoDataExchange(pDX); S`0@fieOf
//{{AFX_DATA_MAP(CCaptureDlg) O(&EnNm[2
DDX_Control(pDX, IDC_KEY, m_Key); EHzU`('?[
DDX_Check(pDX, IDC_CONTROL, m_bControl); zXcSE"
DDX_Check(pDX, IDC_ALT, m_bAlt); 7:x.08
DDX_Check(pDX, IDC_SHIFT, m_bShift); ~p'/Z@Atu
DDX_Text(pDX, IDC_PATH, m_Path); 'QCvN b6
DDX_Text(pDX, IDC_NUMBER, m_Number); ~JC``&6E=}
//}}AFX_DATA_MAP y9W*/H{[`
} ik&loM_
,Oxdqx u7
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @Z3b^G[
//{{AFX_MSG_MAP(CCaptureDlg) ~e%*hZNo
ON_WM_SYSCOMMAND() "ajZ&{Z
ON_WM_PAINT() 7t@jj%F
ON_WM_QUERYDRAGICON() ? ~_%I
ON_BN_CLICKED(ID_ABOUT, OnAbout) s<<vHzm
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ReSP)%oW
ON_BN_CLICKED(ID_CHANGE, OnChange) k9}im
//}}AFX_MSG_MAP 4RTEXoXs
END_MESSAGE_MAP() YnJ=&21
? _HTOOa
BOOL CCaptureDlg::OnInitDialog() !o*oT}6n
{ j:<E=[Kl
CDialog::OnInitDialog(); i]Kq
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [W^6=7EO
ASSERT(IDM_ABOUTBOX < 0xF000); -(:BkA
CMenu* pSysMenu = GetSystemMenu(FALSE); F!fxA#
if (pSysMenu != NULL) HO' ELiZ_q
{ b?w4Nx#
CString strAboutMenu; .>}we ~O
strAboutMenu.LoadString(IDS_ABOUTBOX); I9Z8]Q+2"
if (!strAboutMenu.IsEmpty()) ge[\%
{ rTmcP23]
pSysMenu->AppendMenu(MF_SEPARATOR); @Ki`g(],P
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G4g},p!
} bzUc;&WDz
} I*ho@`U
SetIcon(m_hIcon, TRUE); // Set big icon vKaX,)P;?
SetIcon(m_hIcon, FALSE); // Set small icon nH[@EL
m_Key.SetCurSel(0); g@nE7H1V
RegisterHotkey(); S;|%'Sn|j9
CMenu* pMenu=GetSystemMenu(FALSE); c!kbHZ<Z
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); i~K~Czmok+
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X_%78$N-a`
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;K:.*sAa
return TRUE; // return TRUE unless you set the focus to a control VLQfuh;
} g1&GX(4[
w5~<jw%>
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (q
+Q.Q
{ Qz<v. _
if ((nID & 0xFFF0) == IDM_ABOUTBOX) oO= 6Kd+T
{ WBC'~ h<@
CAboutDlg dlgAbout; {{2ZWK 6|
dlgAbout.DoModal(); A`OU}'v?L
} Dhef|E<
else #}k^g:l1
{ >aa-ix
&
CDialog::OnSysCommand(nID, lParam); N|7._AR2
} ;Vp&f%u+v
} m4 4aKqw)
/]+t$K\cBq
void CCaptureDlg::OnPaint() 0D.YO<PU
{ (F_#LeJ|
if (IsIconic()) g00XZ0@
{ H 5sj%
v
CPaintDC dc(this); // device context for painting bZtjg
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Mb$&~!
// Center icon in client rectangle M%$zor
int cxIcon = GetSystemMetrics(SM_CXICON); *7-uQKp
int cyIcon = GetSystemMetrics(SM_CYICON); O"Xjv`j:
CRect rect; @Vb-BC,
GetClientRect(&rect); M?F({#]
int x = (rect.Width() - cxIcon + 1) / 2;
Rl6E
int y = (rect.Height() - cyIcon + 1) / 2; .^Ek1fi.
// Draw the icon nnr(\r~
dc.DrawIcon(x, y, m_hIcon); |@d7o]eM|
} <PfW
else '<XG@L
{ n*_FC
CDialog::OnPaint(); Dk[[f<H_{
} lT$A;7[
} E-!`6
6oJ~Jdn'
HCURSOR CCaptureDlg::OnQueryDragIcon() ZEApE+m
{ ?[VS0IBS
return (HCURSOR) m_hIcon; t,=khZ
} u1>| 2D
E@[`y:P
void CCaptureDlg::OnCancel() eb+[=nmP
{ Jh }3AoD
if(bTray) nwV\[E
DeleteIcon(); O<o_MZN
CDialog::OnCancel(); &4BN9`|:
} d3Y#_!)
E5 Y92vu
void CCaptureDlg::OnAbout() }0f[x ?V
{ [qid4S~r,&
CAboutDlg dlg; se(_`a/4Q
dlg.DoModal(); nP_ s+k
} JO1c9NyKr
"CLd_H*)c
void CCaptureDlg::OnBrowse() 2Uk$9s
{ mtJI#P
CString str; \Dr@n^hk@[
BROWSEINFO bi; lfWxdi
char name[MAX_PATH]; *[_?4*F
ZeroMemory(&bi,sizeof(BROWSEINFO)); i<&2Ffvq
bi.hwndOwner=GetSafeHwnd(); v( (fRX.`
bi.pszDisplayName=name; _>&zhw2
bi.lpszTitle="Select folder"; 3:);vh!
bi.ulFlags=BIF_RETURNONLYFSDIRS; \_BaV0<
LPITEMIDLIST idl=SHBrowseForFolder(&bi); h4.ZR={E
if(idl==NULL) ?M\3n5;
return; BIX%Bu0'f
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )e{~x
u
str.ReleaseBuffer(); 6AzH'HF
m_Path=str; t
ZFG`'/
if(str.GetAt(str.GetLength()-1)!='\\') wRU pQ~=B2
m_Path+="\\"; j;<;?IW
UpdateData(FALSE); RCgs3JIE+2
} ,=z8aiUu
m qtl0P0
void CCaptureDlg::SaveBmp() kS+*@o
{ )2FS9h.t
CDC dc; g!aM-B^C
dc.CreateDC("DISPLAY",NULL,NULL,NULL); }R.cqk\qa^
CBitmap bm; :IS]|3wD
int Width=GetSystemMetrics(SM_CXSCREEN); )/f,.Z$
int Height=GetSystemMetrics(SM_CYSCREEN); }4ta#T Ea
bm.CreateCompatibleBitmap(&dc,Width,Height); | F:?
CDC tdc; ]36 R_Dp
tdc.CreateCompatibleDC(&dc); TQbhK^]
CBitmap*pOld=tdc.SelectObject(&bm); rXfQ_
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ywCE2N<-V?
tdc.SelectObject(pOld); +mV4Ty
BITMAP btm; g^8bY=*
.
bm.GetBitmap(&btm); '&s:,o-p
DWORD size=btm.bmWidthBytes*btm.bmHeight; wCc:HfmjJ
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); kqv>rA3
BITMAPINFOHEADER bih; *crpM3fO>
bih.biBitCount=btm.bmBitsPixel; 30[?XVI&
bih.biClrImportant=0; H
VG'v>s@
bih.biClrUsed=0;
KqaeRs.u
bih.biCompression=0; aoMQ_@0
bih.biHeight=btm.bmHeight; b6oPnP_3P
bih.biPlanes=1; v,1.n{!;
bih.biSize=sizeof(BITMAPINFOHEADER);
:E'38~
bih.biSizeImage=size; \+S~N:@><k
bih.biWidth=btm.bmWidth; }^P( p?~
bih.biXPelsPerMeter=0; -Z]?v3
9
bih.biYPelsPerMeter=0; sa*]q~a
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); "S)4Cjk
static int filecount=0; RQ9T<t42
CString name; 9k2HP]8=[{
name.Format("pict%04d.bmp",filecount++); <[[DS%(M^
name=m_Path+name; ' J]V"Z)
BITMAPFILEHEADER bfh; bg[q8IBCd
bfh.bfReserved1=bfh.bfReserved2=0; R}Z"Yxx
bfh.bfType=((WORD)('M'<< 8)|'B'); uVOOw&q_
bfh.bfSize=54+size; 0.|tKetHq
bfh.bfOffBits=54; sDWX} NV
CFile bf; _vvnxG!x&
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h^34{pKDn
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hRGK W
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c9iCH~
bf.WriteHuge(lpData,size); #).om*Xh
bf.Close(); /3rt]h"
nCount++; 3}n=o d=
} WynHcxC
GlobalFreePtr(lpData); ;c<:"ad(
if(nCount==1) JTl
37j
m_Number.Format("%d picture captured.",nCount); ,Ea.ts>
else
0qZ{:}`3
m_Number.Format("%d pictures captured.",nCount); t'0r4&\
UpdateData(FALSE); U}7$:hO"dX
} ma?569Z8~0
pk(<],0]X
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g:e|
{ 42tD$S5^
if(pMsg -> message == WM_KEYDOWN) #.a4}ya19
{ =4+UX*&i?.
if(pMsg -> wParam == VK_ESCAPE) Z4bN|\I
return TRUE; f{WJM>$:
if(pMsg -> wParam == VK_RETURN) &l{yEWA}g
return TRUE; %^gT.DsX-
} %+FM$xyJ
return CDialog::PreTranslateMessage(pMsg); =@V4V} ?
} ~SP.&>Q>
t3v*P6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p !U#53
{ O)&xT2'J
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \f0I:%-
SaveBmp(); duV|'ntr
return FALSE; ~>xn9vb=
} 7Dom[f
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [,|KVc=&H
CMenu pop; Rm)vY}v
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :#I8Cf
CMenu*pMenu=pop.GetSubMenu(0); J'^BxN&
pMenu->SetDefaultItem(ID_EXITICON); SM![ yC
CPoint pt; F)5QpDmqb
GetCursorPos(&pt); 9j$
OU@N
8
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H>;km$b +
if(id==ID_EXITICON)
(= uwx#
DeleteIcon(); ?GB($D=Y'&
else if(id==ID_EXIT) ]n\WCU]0
OnCancel(); Fov/?:f$
return FALSE; t*e+[
} ^=E4~22q
LRESULT res= CDialog::WindowProc(message, wParam, lParam); u#la+/
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9%kY8#%SV
AddIcon(); mcS/-DaN?
return res; U|-4*l9Ed
} {eqUEdC
= ?vk n
void CCaptureDlg::AddIcon() f1hi\p0q
{ VH,k EbJ
NOTIFYICONDATA data; DU]MMR
data.cbSize=sizeof(NOTIFYICONDATA); w0^( jMQe^
CString tip; *G>V`||RW
tip.LoadString(IDS_ICONTIP); Qf7]t-Kp
data.hIcon=GetIcon(0); <74q]C
data.hWnd=GetSafeHwnd(); =@gH$Q_1
strcpy(data.szTip,tip); k;;?3)!
data.uCallbackMessage=IDM_SHELL; zUIh8cAoE
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8X5;)h
data.uID=98; dGP*bMCT
Shell_NotifyIcon(NIM_ADD,&data); L.l%EcW=,
ShowWindow(SW_HIDE); _BtppQIWv
bTray=TRUE; >:Xzv
} d7$H})[^
T*-*U/
void CCaptureDlg::DeleteIcon() @\u)k
{ I)_072^O
NOTIFYICONDATA data; ZRD* ^9)
data.cbSize=sizeof(NOTIFYICONDATA); CHN!o9f
data.hWnd=GetSafeHwnd(); ,^:Zf|V
data.uID=98; Xdq2 .:\
Shell_NotifyIcon(NIM_DELETE,&data); T1\Xz-1
ShowWindow(SW_SHOW); H<X4R
SetForegroundWindow(); P}DrUND
ShowWindow(SW_SHOWNORMAL); L1P]T4a@)
bTray=FALSE; _
CXKJ]m4
} S;i^ucAF
A<y3Tc?Q
void CCaptureDlg::OnChange() J U}XSb
{ W4|1wd}.t
RegisterHotkey(); [)Xu60?Q
} pWbzBgM?nU
iDp]lu
BOOL CCaptureDlg::RegisterHotkey() zdU<]ge
{ K]N^6ome
UpdateData(); 6\OSIxJZF
UCHAR mask=0; &"Ua"H)
UCHAR key=0; s3/->1#i
if(m_bControl) F@"Xd9q?
mask|=4; SO]x^+[
if(m_bAlt) jWUN~#p!
mask|=2; htMsS4^Kvd
if(m_bShift) y !47!Dn
mask|=1; ;T-i+_
key=Key_Table[m_Key.GetCurSel()]; R:0Fv9bwS
if(bRegistered){ "EWU:9\0
DeleteHotkey(GetSafeHwnd(),cKey,cMask); vb{&T<
bRegistered=FALSE; >F Z6\
} 0pBlmPafY
cMask=mask; j=PQoEtU'<
cKey=key; q,QMvUK:
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T/)$}#w0i
return bRegistered; i3rvDch
} =f.f%g6
JEU?@J71O
四、小结 E)#3*Wlu$
-58r*[=8
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。