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:
<a[8;YQC
v!h-h&p O7 一、实现方法
+mOtYfW A y[L{!)2{ 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:
GiwA$^Hg\ 'R'a/ZR`B7 #pragma data_seg("shareddata")
gbf=H8] HHOOK hHook =NULL; //钩子句柄
"I FGW4FnL UINT nHookCount =0; //挂接的程序数目
l{o{=]x1 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
AHD%6 \$ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
kD7(}N8YR static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
TPFmSDq static int KeyCount =0;
32P ]0&_O static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
K.1yncS^ #pragma data_seg()
~RAH -] nnl9I4-O 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。
NT/B4'_@ $QBUnLOek& 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:
xF|*N<9(</ \U>Kn_7m BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ea>\.D-S cKey,UCHAR cMask)
4F6o {
M
F: Eu BOOL bAdded=FALSE;
t3g!5 for(int index=0;index<MAX_KEY;index++){
"1Aus if(hCallWnd[index]==0){
$i>VI hCallWnd[index]=hWnd;
J3^Z PW HotKey[index]=cKey;
1^^D :tt HotKeyMask[index]=cMask;
lFY8^#@ bAdded=TRUE;
1tz .e\ KeyCount++;
):ZumG#o break;
tgA
|Vwwk }
!r0P\ }
Rj`Y X0?+ return bAdded;
*7ro [ }
S]/+n> //删除热键
C
P{h+yCj BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
toJ&$HrE {
w/6@R 4)p BOOL bRemoved=FALSE;
S6tH!Z=(g for(int index=0;index<MAX_KEY;index++){
`_^=OOn
if(hCallWnd[index]==hWnd){
]_8 \g`"u if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
F
&}V65 hCallWnd[index]=NULL;
RhmVHhj HotKey[index]=0;
f"^tOgGH HotKeyMask[index]=0;
V7_??L%Ct` bRemoved=TRUE;
BKJwM'~ KeyCount--;
wF\5 X break;
-ge :y2R_w }
B098/`r }
jn:9Cr,o;g }
%Jb/HWC[ return bRemoved;
}$wWX}@ }
wU $j/~L $TK<~3` +#wh`9[wBt DLL中的钩子函数如下:
;5.S" /l.ox.4z# LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@TqqF:c7 {
{wS)M BOOL bProcessed=FALSE;
0DQ\akh if(HC_ACTION==nCode)
a*T=;P3(I {
xA7Aw0 if((lParam&0xc0000000)==0xc0000000){// 有键松开
#y2IHO- switch(wParam)
6 $*\% {
]$=\zL case VK_MENU:
gd=gc<z YP MaskBits&=~ALTBIT;
BJ$\Mb##3@ break;
fa:V8xa
case VK_CONTROL:
:Y\!~J3W MaskBits&=~CTRLBIT;
9`8D Ga break;
W_\~CntyZ case VK_SHIFT:
NJqjW MaskBits&=~SHIFTBIT;
ZaKT~f%%z break;
f?[0I\V[$ default: //judge the key and send message
FcaO- break;
$eQf 5)5 }
W5c?f, for(int index=0;index<MAX_KEY;index++){
f?P>P23 if(hCallWnd[index]==NULL)
k __MYb continue;
KbicP< if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
E{B8+T:3 {
{<J(*K*\Jo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Dqz9NB bProcessed=TRUE;
QY}1i .f }
a* GiLq }
)u67=0s2i+ }
QswbIP/>:' else if((lParam&0xc000ffff)==1){ //有键按下
]?"1FSu-8r switch(wParam)
=|Vm69 {
X) O9PQ case VK_MENU:
"%[a Wb MaskBits|=ALTBIT;
e4rhB"qQdn break;
M%S.Z4D
(0 case VK_CONTROL:
R'e>YDC MaskBits|=CTRLBIT;
3`%U)gCT5 break;
8F(Vd99I case VK_SHIFT:
:.J]s<J(F MaskBits|=SHIFTBIT;
8Vf]K}d break;
+[C><uP default: //judge the key and send message
rfwX:R6,g break;
S)L(~N1 }
hxX-iQya
for(int index=0;index<MAX_KEY;index++){
Z}NMDb:t
if(hCallWnd[index]==NULL)
1*vt\,G continue;
Y[p if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
q?TI(J+/ {
f0Zn31c^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
66jL2XU< bProcessed=TRUE;
KvtX>3#qM }
E3`&W8 }
zhW.0:9
CR }
Pko2fJt1 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
A!n)Fpk
for(int index=0;index<MAX_KEY;index++){
F4$N:Jkl if(hCallWnd[index]==NULL)
iF!r}fUU6 continue;
Z.x9SEe1t if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
/~nPPC SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
XI8rU)q //lParam的意义可看MSDN中WM_KEYDOWN部分
+w(>UBy- }
n)6mfoe }
}+3v5Nz; }
rh+2
7" return CallNextHookEx( hHook, nCode, wParam, lParam );
\pJBBG }
l$mfsm|{: |WMP_sGn 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
^Ox|q_E
w} *!p#1fE BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
R3\oLT4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
OEwKT7CX v==]v2- 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
x+B7r&#: v5Qp[O_ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
l:?w{'i$ {
:^H#i:4 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
+D&aE$< {
n(.U>_
P //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*~H\#N|x SaveBmp();
BL?Bl&p( return FALSE;
+PfXc?VU }
p%?m|(4f …… //其它处理及默认处理
c^a Dr }
']cRSj. i<ug("/ ,rZp(moj 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。
hNWZ1r~_ .
v
L4@_ 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。
pjVF^gv,*
W!.vP~ > 二、编程步骤
K[/sVaPZ $T%~t@Cv1 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";
^w1&A3=6 +*AdSzX 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
m(6SiV=D9 $ &III 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;
d} {d5-_a ytkV"^1^ 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;
)!tqock*v qS.TVNZ 5、 添加代码,编译运行程序。
E!_mXjlPc n +R3 三、程序代码
LFHzd@Y7" A\IQM^i ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
TcjTF|q> #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
E]<Ce;Vj #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
%n7Y5|Uh #if _MSC_VER > 1000
S]#xG+$< #pragma once
y8k*{1MuO #endif // _MSC_VER > 1000
&R7N^*He #ifndef __AFXWIN_H__
5OS|Vp||b #error include 'stdafx.h' before including this file for PCH
#MwNyZ #endif
AXmW7/Sj" #include "resource.h" // main symbols
EqB3f_ class CHookApp : public CWinApp
H,Ik&{@j {
I]dt1iXu_{ public:
8;vpa* CHookApp();
[@RJ2q$ // Overrides
uOU?-WtPz // ClassWizard generated virtual function overrides
1>wQ&{ //{{AFX_VIRTUAL(CHookApp)
;3 |Z}P public:
WhU-^`[* virtual BOOL InitInstance();
3\~
RWoB0u virtual int ExitInstance();
*pMu,?uE //}}AFX_VIRTUAL
Z6Kw'3 //{{AFX_MSG(CHookApp)
<R%]9#re // NOTE - the ClassWizard will add and remove member functions here.
n@
rphJb // DO NOT EDIT what you see in these blocks of generated code !
{TV6eV //}}AFX_MSG
\8 ~`NF DECLARE_MESSAGE_MAP()
h%0hryGB };
4IEF{"c_8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
[LcHO] _^M BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
C OC6H'F BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
`_*NFv1_ BOOL InitHotkey();
qDzd_E@aR BOOL UnInit();
0
jszZ_ #endif
)C0dN>Gb <oP"kh<D4 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
!>,\KxnM #include "stdafx.h"
[dQL6k";b #include "hook.h"
"}ms| #include <windowsx.h>
]WsQ= #ifdef _DEBUG
uX!5G:x] #define new DEBUG_NEW
{Tps3{|wt #undef THIS_FILE
YKUb'D:t] static char THIS_FILE[] = __FILE__;
PQkFzyk #endif
kK0.j)( #define MAX_KEY 100
)}/ ycTs #define CTRLBIT 0x04
+ Z7 L&BI #define ALTBIT 0x02
pQ_EJX) #define SHIFTBIT 0x01
lR[]A #pragma data_seg("shareddata")
Ke*tLnO HHOOK hHook =NULL;
zeHf(N UINT nHookCount =0;
Q.]$t
2J static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
F&Bh\C)] static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
^Uj\s / static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
XtJIaD|:3 static int KeyCount =0;
t-gLh(-. static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
o4^|n1vN #pragma data_seg()
)V6Bzn}9 HINSTANCE hins;
'P:u/Sq?m void VerifyWindow();
=ObI BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
!Qqi% //{{AFX_MSG_MAP(CHookApp)
+nz6+{li\ // NOTE - the ClassWizard will add and remove mapping macros here.
'4"9f]: // DO NOT EDIT what you see in these blocks of generated code!
)$>
pu{o //}}AFX_MSG_MAP
(}#8$ ) END_MESSAGE_MAP()
Asy&X ma gZmY~ CHookApp::CHookApp()
Q[wTV3d {
MXsCm( // TODO: add construction code here,
'o!{YLJ fM // Place all significant initialization in InitInstance
YLx4qE }
:j)v=qul L/[b~D>T% CHookApp theApp;
9i=HZ\s3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
B%.vEk)* {
Fad.!%[ BOOL bProcessed=FALSE;
$$5E+UDOs if(HC_ACTION==nCode)
~OE1Sd:2 {
FJ/c(K if((lParam&0xc0000000)==0xc0000000){// Key up
j6JK4{ switch(wParam)
NKSK+ll2 {
<73dXTZ0 case VK_MENU:
^5GyW`a}
MaskBits&=~ALTBIT;
, S
} break;
F?Fs x)2k case VK_CONTROL:
B1U<m=Y MaskBits&=~CTRLBIT;
t/k MV6 break;
WXj
iKW( case VK_SHIFT:
'bb*$T0= MaskBits&=~SHIFTBIT;
(*K=&e0O break;
- _KO}_ default: //judge the key and send message
9K6G% break;
+W7#G `> }
jR_o!n~5 for(int index=0;index<MAX_KEY;index++){
S=@bb$4-T if(hCallWnd[index]==NULL)
o?O> pK continue;
0XWhSrHM if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%`# HGji) {
mWP1mc:M( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,8`CsY^1 bProcessed=TRUE;
!!\x]$v }
fN!lXPgM }
~ubcD6f }
sA|!b.q else if((lParam&0xc000ffff)==1){ //Key down
O!U8"Yr$ switch(wParam)
_pN:p7l( {
N fBH case VK_MENU:
}HKt{k&$ MaskBits|=ALTBIT;
^Mm sja5K break;
lE*.9T case VK_CONTROL:
{UF|-VaG MaskBits|=CTRLBIT;
Ri}JM3\J break;
23opaX5V= case VK_SHIFT:
=/4}!B/ MaskBits|=SHIFTBIT;
&ha<pj~ break;
?ZkVk =t? default: //judge the key and send message
(D\`:1g break;
wqyF"^It" }
7i9wfc h$U for(int index=0;index<MAX_KEY;index++)
N\zUQ
J {
E_K32)J- if(hCallWnd[index]==NULL)
R78lV-};Q continue;
alZ83^YN' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
h ?+vH{}j {
kfy|3KA3m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Q_|Lv& bProcessed=TRUE;
e]smnf }
v79\(BX }
c nV2}U/\ }
AF-uTf if(!bProcessed){
uO;_T/^u for(int index=0;index<MAX_KEY;index++){
yUzpl[*e^o if(hCallWnd[index]==NULL)
(:2,Rr1" continue;
_.y0QkwV if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
&E&e5(&$ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
PtT=HvP!k }
Eax^1 |6 }
xVn"xk }
aOH$}QnS return CallNextHookEx( hHook, nCode, wParam, lParam );
y.l`NTT]< }
o`8dqP nCz_gYcIx BOOL InitHotkey()
RvQl{aL {
$H9+>Z0( if(hHook!=NULL){
Tjfg[Z/x nHookCount++;
vyt$ return TRUE;
a19yw]hF5 }
G8y:f%I!b else
lm?1 K:+[ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
f
xWW"B*A if(hHook!=NULL)
%V>Ss9;/8 nHookCount++;
cK;,=\ return (hHook!=NULL);
Q -!,yCu }
X*'tJN$ BOOL UnInit()
G8w<^z>pTg {
x<m{B@3T if(nHookCount>1){
p[Pa(a,B7 nHookCount--;
l\PDou@5 return TRUE;
G:W4<w }
%h)6o99{wF BOOL unhooked = UnhookWindowsHookEx(hHook);
hL1q9% if(unhooked==TRUE){
IFrq\H0 nHookCount=0;
v8
Q/DJ~ hHook=NULL;
Q}pnb3J>T }
Pm2T!0 return unhooked;
mN5`Fct*A> }
m!{}Y]FZn c\X0*GX BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[kdt]+'+ {
v3b[08
F BOOL bAdded=FALSE;
~ vD7BO` for(int index=0;index<MAX_KEY;index++){
1<hj3 if(hCallWnd[index]==0){
s?;rP,{:p hCallWnd[index]=hWnd;
b 9M.p*! HotKey[index]=cKey;
8no_xFA HotKeyMask[index]=cMask;
t`b>iX%(1t bAdded=TRUE;
IUX~dO KeyCount++;
V K/;ohTTP break;
(mq 7{;7y }
Pb0+z=L }
:Jp$_T&E return bAdded;
ZyE2=w7n }
3}::"X %G9:M;|' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F^kH"u[ {
E.v~<[g BOOL bRemoved=FALSE;
}Sa2s&[< for(int index=0;index<MAX_KEY;index++){
wAE,mw if(hCallWnd[index]==hWnd){
]Xcqf9k if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
n8"S;:Zm hCallWnd[index]=NULL;
BsVUEF ,N HotKey[index]=0;
ShanwaCDqv HotKeyMask[index]=0;
b?h9G3J_a bRemoved=TRUE;
*&)<'6 KeyCount--;
)AOD~T4s7 break;
juuBLv }
R}4o{l6 }
P8.tl"q }
0 3L"W^gc return bRemoved;
Sv.z9@S }
{O*<1v9< O4FW/)gq void VerifyWindow()
s}A)sBsaP3 {
N m-{$U for(int i=0;i<MAX_KEY;i++){
p2|c8n== if(hCallWnd
!=NULL){ zcItZP
if(!IsWindow(hCallWnd)){ ZjY_AbD
hCallWnd=NULL; y|b|_eE?{
HotKey=0; PqPLy
HotKeyMask=0; COFs?L.`
KeyCount--; lf0/0KH
} YS?P A#
} s8}:8
} M
^ZoBsZ
} Y_>z"T
BzF.KCScs
BOOL CHookApp::InitInstance() J[YA1
{ v6oPAqj,r
AFX_MANAGE_STATE(AfxGetStaticModuleState()); J><O
51
hins=AfxGetInstanceHandle(); L;nRI.
InitHotkey(); 52m^jT Sx
return CWinApp::InitInstance(); ?Li^XONz
} a%tm[Re
&o^ wgmS
int CHookApp::ExitInstance() /`\-.S9
{ vPmP<c)cb
VerifyWindow(); h@Ea$1'e,
UnInit(); E{T\51V]%
return CWinApp::ExitInstance(); GWjKZ1p
} Jkpw8E7
k(=\&T
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @5
kKMz
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p$f#W
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i0-!!
#if _MSC_VER > 1000 7zr\AgV9
#pragma once U`FybP2R~
#endif // _MSC_VER > 1000 WeuV+}\b
`m3@mJ!>\
class CCaptureDlg : public CDialog 34YYw@?}Y
{ Mn>dI@/gM
// Construction Ou2H~3^PL
public: BGOI$,
BOOL bTray; Rt7}e09HV
BOOL bRegistered; z(.$>O&6H
BOOL RegisterHotkey(); L)8 +/+
UCHAR cKey;
a[";K,
UCHAR cMask; huvg'Yt
void DeleteIcon(); -/x +M-X#
void AddIcon(); dwrc"GK!o
UINT nCount; .~v~~VL1NS
void SaveBmp(); ;zs*Zd7h M
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ez?vJDd
// Dialog Data :FG}k Y
//{{AFX_DATA(CCaptureDlg) Q)#<T]~=
enum { IDD = IDD_CAPTURE_DIALOG }; C>v
CComboBox m_Key; UgJlXB|a%2
BOOL m_bControl; JsnavI6
BOOL m_bAlt; &M>S$+I
n
BOOL m_bShift; e7,iO#@:m
CString m_Path; Redp'rXT<h
CString m_Number; [2i+f<
//}}AFX_DATA `Z|sp
// ClassWizard generated virtual function overrides G8u8&|
//{{AFX_VIRTUAL(CCaptureDlg) ^l$(- #'y
public: YD.3FTNGC
virtual BOOL PreTranslateMessage(MSG* pMsg); |\QR9>
protected: O b8[P=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3;>(W
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); m*i~Vjxj-m
//}}AFX_VIRTUAL R%#c~NOO
// Implementation ?b#?Vz
protected: rFx2S
HICON m_hIcon; /4_}wi\
// Generated message map functions *N>Qj-KAM_
//{{AFX_MSG(CCaptureDlg) =7e8N&-nv
virtual BOOL OnInitDialog(); *}/xy
SH3
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); GbP!l;a
afx_msg void OnPaint(); 7e8hnTzl8<
afx_msg HCURSOR OnQueryDragIcon(); P?9CBhN
virtual void OnCancel(); N"r ;d+LTL
afx_msg void OnAbout(); bw\=F_>L
afx_msg void OnBrowse(); q?L(V+X
afx_msg void OnChange(); t {"iIz_S
//}}AFX_MSG GU3/s&9
DECLARE_MESSAGE_MAP() 0f^.zt{T
}; ,7P^]V1
#endif >#?: x*[
2[po~}2-0
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [QbXj0en$
#include "stdafx.h" P;%QA+%7
#include "Capture.h" MuGg
z>CV[
#include "CaptureDlg.h" ap^=CEf
#include <windowsx.h> <y!r~?
#pragma comment(lib,"hook.lib") ]Rh(=bg
#ifdef _DEBUG suFOc
#define new DEBUG_NEW Ts .Zl{B
#undef THIS_FILE ;6nZ
static char THIS_FILE[] = __FILE__; ':D&c
#endif lmKq xs4
#define IDM_SHELL WM_USER+1 a~F@3Pd
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WG
!t!1p
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !`[I>:Ex
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ZT8Ji?_n
class CAboutDlg : public CDialog !9xANSb
{ G.nftp(*}
public: 9jGuelwN
CAboutDlg(); d[e:}1
// Dialog Data AH'4H."o/9
//{{AFX_DATA(CAboutDlg) i
`QK'=h[
enum { IDD = IDD_ABOUTBOX }; q'F_j"
//}}AFX_DATA WG/J4H`Od
// ClassWizard generated virtual function overrides Mp"ci+Iu
//{{AFX_VIRTUAL(CAboutDlg) BrH;(*H)8
protected: $Cd ;0gdv
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R P:F<`DB|
//}}AFX_VIRTUAL e=o{Zo?H=
// Implementation ix7
e])m(
protected: `3y!XET
//{{AFX_MSG(CAboutDlg) MIlCUk
//}}AFX_MSG XDdcq ]*|
DECLARE_MESSAGE_MAP() &lPBqw
}; %Mng8r
*76viqY;dE
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _lPl)8k
{ ?3,64[
//{{AFX_DATA_INIT(CAboutDlg) 4nII/cPG
//}}AFX_DATA_INIT z[\W\g*|ri
} SXBQ
T]#,R|)d
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zz 'dg-F
{ 40Qzo%eL
CDialog::DoDataExchange(pDX); mE^tzyh
//{{AFX_DATA_MAP(CAboutDlg) >!Ap/{2
//}}AFX_DATA_MAP nK jeH@
} \gp,Txueb
AO}i@YJth
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `@$"L/AJ
//{{AFX_MSG_MAP(CAboutDlg) B}q
// No message handlers ?$J7%I@
//}}AFX_MSG_MAP |c
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END_MESSAGE_MAP() F7Dc!JNa
-S,ir
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 827)n[#%|
: CDialog(CCaptureDlg::IDD, pParent) Jn[q<e"
{ sh
!~T<yy
//{{AFX_DATA_INIT(CCaptureDlg) W?^8/1U
m_bControl = FALSE; O~#uQm
m_bAlt = FALSE; >2lAy:B5
m_bShift = FALSE; ~w1{zxs
m_Path = _T("c:\\"); fsrg2:kQ
m_Number = _T("0 picture captured."); ^%oG8z,L
nCount=0; LZQFj/,Jg
bRegistered=FALSE; +f\pk \Ith
bTray=FALSE; RUS7Z~5
//}}AFX_DATA_INIT A&|Wvb=
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K/wiL69
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); yL;o{
G
} V5yxQb
vfJ3idvo*w
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) oDW<e'Jm
{ I(^jOgYU
CDialog::DoDataExchange(pDX); d4p{5F7]^
//{{AFX_DATA_MAP(CCaptureDlg) ^A11h6I
DDX_Control(pDX, IDC_KEY, m_Key); yZ;k@t_WRD
DDX_Check(pDX, IDC_CONTROL, m_bControl); `rz`3:ZH
DDX_Check(pDX, IDC_ALT, m_bAlt); CRc!|?
DDX_Check(pDX, IDC_SHIFT, m_bShift); xH"W}-#[
DDX_Text(pDX, IDC_PATH, m_Path); ?GUz?'d
DDX_Text(pDX, IDC_NUMBER, m_Number); Ez/\bE
//}}AFX_DATA_MAP A]Q1&qM%
} mEB2RLCM
|5O >>a()
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Et}C`vZ+Ve
//{{AFX_MSG_MAP(CCaptureDlg) lPRdwg-
ON_WM_SYSCOMMAND() h;EwkbDQg>
ON_WM_PAINT() nE]~E xr
ON_WM_QUERYDRAGICON() x2j/8]'o
ON_BN_CLICKED(ID_ABOUT, OnAbout) (o x4K{
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2vqmsl?
ON_BN_CLICKED(ID_CHANGE, OnChange) Jt-XmGULB
//}}AFX_MSG_MAP [GR]!\!%~
END_MESSAGE_MAP() ]cF1c90%
<\1}@?NGC
BOOL CCaptureDlg::OnInitDialog() r^w\9a_
{ 9n>$}UI\
CDialog::OnInitDialog(); ]RH=s7L
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _W@,@hOH
ASSERT(IDM_ABOUTBOX < 0xF000); kyW6S+ #-
CMenu* pSysMenu = GetSystemMenu(FALSE); M^j<J0(O
if (pSysMenu != NULL) E8T"{
R80
{ 5,HCeN
CString strAboutMenu; ^%n124
strAboutMenu.LoadString(IDS_ABOUTBOX); /h?<MI\7V
if (!strAboutMenu.IsEmpty()) ?%cn'=>ZI
{ 6}VUD
-}B
pSysMenu->AppendMenu(MF_SEPARATOR); G 2%
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6QN1+MwB
} uY&=eQ_Cb
} to99_2
SetIcon(m_hIcon, TRUE); // Set big icon 8_xnWMOe
SetIcon(m_hIcon, FALSE); // Set small icon gCv"9j<j
m_Key.SetCurSel(0); 6#E]zmXO2
RegisterHotkey(); ^G}# jg.
CMenu* pMenu=GetSystemMenu(FALSE); -M"IVyy@
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qTyg~]e9(
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);
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pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); sW;7m[o
return TRUE; // return TRUE unless you set the focus to a control h6g=$8E
} sS
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n
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) FQ+8J 7
{ W;^N8ap%
if ((nID & 0xFFF0) == IDM_ABOUTBOX) HDyQzCG,
{ 'b8R#R\P
CAboutDlg dlgAbout; E::L?#V
dlgAbout.DoModal(); pp(H
PKs=}
} a*V9_Px$&
else BRe{1i 6
{ -r!42`S
CDialog::OnSysCommand(nID, lParam); /
>%L[RJ4
} aw1P5aPmX
} }.'Z=yy
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void CCaptureDlg::OnPaint() f:xUPH?+
{ iDZrK%fl
if (IsIconic()) WS5A Y @(~
{ ~NxEc8Y
CPaintDC dc(this); // device context for painting ,NDh@VYe
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :JR<SFjm
// Center icon in client rectangle qB+n6y%
int cxIcon = GetSystemMetrics(SM_CXICON); 5Yl6?
int cyIcon = GetSystemMetrics(SM_CYICON); G=1m]>I8
CRect rect; ; VBpp<
GetClientRect(&rect); RYt6=R+f
int x = (rect.Width() - cxIcon + 1) / 2; d^tVD`Fm
int y = (rect.Height() - cyIcon + 1) / 2; %8
qSv%_
// Draw the icon G[#.mD{k
dc.DrawIcon(x, y, m_hIcon); qh$X^%g
} Ee8--
else tR<L`?4
{ BH5w@
CDialog::OnPaint(); 9<v}LeX
} 8hZwQ[hr
} 0vDg8i\
_e_4Q)z-a
HCURSOR CCaptureDlg::OnQueryDragIcon() _e* c
{ 6%%PP8.F
return (HCURSOR) m_hIcon; ?NlSeh
} `
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void CCaptureDlg::OnCancel() ~6kJ~R4
{ -Un=TX
if(bTray) )
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DeleteIcon(); {|XQO'Wg
CDialog::OnCancel(); ge$LIsE8
} qC..\{z
~5ubh2{
void CCaptureDlg::OnAbout() |YRY!V_w
{ _jmkl
B
CAboutDlg dlg; 8)Zk24:])_
dlg.DoModal(); UW/N MjK
} =53bLzr
{y b D
void CCaptureDlg::OnBrowse() ESIzGaM
{ 5z~\5x
CString str; H}
6CKP}
BROWSEINFO bi; |!Fk2Je,
char name[MAX_PATH]; ]`d2_mu
ZeroMemory(&bi,sizeof(BROWSEINFO)); G'9{a'
bi.hwndOwner=GetSafeHwnd(); .'/l'>
bi.pszDisplayName=name; KmL$M
bi.lpszTitle="Select folder"; _88QgThb
bi.ulFlags=BIF_RETURNONLYFSDIRS; .LObOR5J7
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,1
P[
if(idl==NULL) AW/wI6[T
return; B+Z13;}B
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); AK *N
str.ReleaseBuffer(); {zP#woz2Q
m_Path=str; > :Ze4}(
if(str.GetAt(str.GetLength()-1)!='\\') %b=p< h'(
m_Path+="\\"; )* TF"
UpdateData(FALSE); P"F{=\V1`<
} VNj@5s
A,BEKjR~J
void CCaptureDlg::SaveBmp() 8%ik853`
{ 2xn<E>]
CDC dc; `?9T~,
dc.CreateDC("DISPLAY",NULL,NULL,NULL); d0
-~|`5
CBitmap bm; 7F(5)Utt
int Width=GetSystemMetrics(SM_CXSCREEN); 8a>SC$8"
int Height=GetSystemMetrics(SM_CYSCREEN); #*2Rp8n
bm.CreateCompatibleBitmap(&dc,Width,Height); Uo6(|mm
CDC tdc; j[XYj6*d
tdc.CreateCompatibleDC(&dc); AIh*1>2Xn
CBitmap*pOld=tdc.SelectObject(&bm); 1,`H:%z%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); J#aVo&.Y
tdc.SelectObject(pOld); .X'<
D*
BITMAP btm; ooE{V*Ie
bm.GetBitmap(&btm); })[($$f/
DWORD size=btm.bmWidthBytes*btm.bmHeight; (A{NF(
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .X
`C^z]+
BITMAPINFOHEADER bih; mW4%2fD[
bih.biBitCount=btm.bmBitsPixel; T'1gy}
bih.biClrImportant=0; XoItV
bih.biClrUsed=0; vZkXt!%)
bih.biCompression=0; MEq"}zrh
bih.biHeight=btm.bmHeight; -(IC~
bih.biPlanes=1; T2weAk#J
bih.biSize=sizeof(BITMAPINFOHEADER); S|K}k:v8
bih.biSizeImage=size; v <Hb-~
bih.biWidth=btm.bmWidth; \c7>:DH
bih.biXPelsPerMeter=0; *)> do
L
bih.biYPelsPerMeter=0; vPmnN^
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); q*8lnk
static int filecount=0; y3IWfiz>/d
CString name; Z]vL%Gg*!
name.Format("pict%04d.bmp",filecount++); ]sj0~DI*m
name=m_Path+name; 1R*=.i%W
BITMAPFILEHEADER bfh; AhxGj+
bfh.bfReserved1=bfh.bfReserved2=0; B QjGv?p0s
bfh.bfType=((WORD)('M'<< 8)|'B'); ;7rv
bfh.bfSize=54+size; "!Lkp2\
bfh.bfOffBits=54; p=gX!4,9<
CFile bf; <1@
(ioPH
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9y~"|t
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Do*n#=
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); m22wF>9
bf.WriteHuge(lpData,size); *YvRNHP
bf.Close(); 8eyl,W=dn
nCount++; lS9n@
} Gvx[8I
GlobalFreePtr(lpData); C;qMw-*F
if(nCount==1) >eS$
m_Number.Format("%d picture captured.",nCount); 9DE)S)e8
else YBjdp=als
m_Number.Format("%d pictures captured.",nCount); $j*Qo/xd
UpdateData(FALSE); N 8t=@~]
} :"'nK6>
3?E}t*/
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ai^|N.!
{ C2/}d? bki
if(pMsg -> message == WM_KEYDOWN) \=nrt?
{ o""~jc~
if(pMsg -> wParam == VK_ESCAPE) WzlC*iv
return TRUE; '6S %9ahE
if(pMsg -> wParam == VK_RETURN) J?Iq9f
return TRUE; P(ZQDTbM
:
} lG"H4Aa>
return CDialog::PreTranslateMessage(pMsg); EUcKN1
} FFzH!=7T?
4/*q0M{}B
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M{KW@7j
{ 3,6Ox45
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -s"0/)HD
SaveBmp(); ZkWL_ H)
return FALSE; J@#?@0]F
} j
_ ;fWBD:
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ I>n
g`
CMenu pop; '%7 Bx of
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &jf7k
<^
CMenu*pMenu=pop.GetSubMenu(0); u"+}I,'L
pMenu->SetDefaultItem(ID_EXITICON); $p$dKH
CPoint pt; >*qQ+_
GetCursorPos(&pt); xRxy|x[
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PK:2xN:=
if(id==ID_EXITICON) -%m3-xZA
DeleteIcon(); OJ3UE(,I=
else if(id==ID_EXIT) C`K^L=8`{
OnCancel(); GozPvR^/
return FALSE; ctn,
]ld
} ' [p)N,
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +^ yq;z
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) k<Sl1vK
AddIcon(); Oh; Jw
return res; G|4^_`-
} iRw&49
H3O@9YU
void CCaptureDlg::AddIcon() S# we3
{ `_qK&&s
NOTIFYICONDATA data; @*O?6>
data.cbSize=sizeof(NOTIFYICONDATA); $c9k*3{<+A
CString tip; r"wtZ]69
tip.LoadString(IDS_ICONTIP); LU2waq}VA
data.hIcon=GetIcon(0); q``wt
data.hWnd=GetSafeHwnd(); Y83GKh,*
strcpy(data.szTip,tip); }iww:H-1
data.uCallbackMessage=IDM_SHELL; "/+zMLY
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;O=h$8]
data.uID=98; Vfs$VY2.
Shell_NotifyIcon(NIM_ADD,&data); =r4!V>
ShowWindow(SW_HIDE); S~yR5cb
bTray=TRUE; w{,4rk;Hr
} 7$uJ7`e
")UwkF
void CCaptureDlg::DeleteIcon() X?Pl<l&
{ HuI`#.MpWE
NOTIFYICONDATA data; ]r/^9XaqtA
data.cbSize=sizeof(NOTIFYICONDATA); Sycw %k
data.hWnd=GetSafeHwnd(); Q!'qC*Gyfn
data.uID=98; =1hr2R(V
Shell_NotifyIcon(NIM_DELETE,&data); |m*.LTO
ShowWindow(SW_SHOW); WFv!Pbq,
SetForegroundWindow(); Gi?_ujZR
ShowWindow(SW_SHOWNORMAL); %s=Dj2+
bTray=FALSE; ,/2LY4` 5
} ukAKFc^)k
Y`ihi,s`H
void CCaptureDlg::OnChange() < n?=|g
{ Gt-UJ-RR y
RegisterHotkey(); )u} Q:`9
} \
v2H^j/
j,-C{ K
BOOL CCaptureDlg::RegisterHotkey() M0'v&g
{ u=NG6G
UpdateData(); l|"6yB |
UCHAR mask=0; 7 &%^>PU7
UCHAR key=0; Af-UScD%G
if(m_bControl) m,MSMw1p
mask|=4; [~mGsXV
if(m_bAlt) |D#2GeBw1h
mask|=2; DSyXr~p8
if(m_bShift) w=_Jc8/.
mask|=1; +pmu2}E.3
key=Key_Table[m_Key.GetCurSel()]; )b4$A:
if(bRegistered){ dF@)M
DeleteHotkey(GetSafeHwnd(),cKey,cMask);
R= 5**
bRegistered=FALSE; 2HL9E|h
} K 1#ji*Tp
cMask=mask; `wz[='yM
cKey=key; 6[ga$nF?
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `N87h"
return bRegistered; VG@};dwbz*
} pbk$o{$`W
/f{$I
四、小结 onei4c>@
|Ul,6K@f"5
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。