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:
j9bn|p$DA
M?3Nh; 一、实现方法
>~D-\,d|f (b]r_|' 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
b/yXE)3
X (B0tgg^jj, #pragma data_seg("shareddata")
AJ:(NV1= HHOOK hHook =NULL; //钩子句柄
1pM"j! UINT nHookCount =0; //挂接的程序数目
WZ3GI
l static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
A<+veqb4 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}H>}v/ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
U^xz>:~ static int KeyCount =0;
Jxq;Uu9 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
3Dm`8Xt
#pragma data_seg()
7M#irCX )PU_'n=> 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。
` !JcQ'u #cZ<[K q6 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:
]W7e2:Hra
/uyZ[=5 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
V1 H3} cKey,UCHAR cMask)
5d4/}o}%" {
{FrcpcrQa BOOL bAdded=FALSE;
:'F7^N3;H for(int index=0;index<MAX_KEY;index++){
$4&%<'l3I if(hCallWnd[index]==0){
V"r2 t9A hCallWnd[index]=hWnd;
OH* HotKey[index]=cKey;
(PM!{u= HotKeyMask[index]=cMask;
HZ+l){u bAdded=TRUE;
-/7[\S KeyCount++;
Pr!H>dH8o break;
`E4+#_ v }
qkg`4'rLg }
m7F"kD return bAdded;
bH7 lUS~ }
Y
>83G`*}b //删除热键
I|SQhbi BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
XEB1%. p {
'H]&$AZ;@ BOOL bRemoved=FALSE;
j\uh]8N3< for(int index=0;index<MAX_KEY;index++){
q\`0'Z, if(hCallWnd[index]==hWnd){
\d,wcL if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
{Y(# <UDM hCallWnd[index]=NULL;
9?IvSv}z HotKey[index]=0;
%:DH_0 HotKeyMask[index]=0;
sgc pH bRemoved=TRUE;
E;m-^dxc KeyCount--;
*Bse3%-v break;
}1sFddGVt }
!97k }
TrEo5H ; }
Hkv4^| return bRemoved;
.wb[cCUQ }
S]O0zv^} $BPTk0Y lDV}vuM<4 DLL中的钩子函数如下:
{?zBc E: ZSUbPz LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?q%&" {
[T<Z? BOOL bProcessed=FALSE;
UrP jZ:K' if(HC_ACTION==nCode)
d<@SRHP( {
VsrYU@V if((lParam&0xc0000000)==0xc0000000){// 有键松开
G 5T{* switch(wParam)
b":3J)Y6. {
6N<v&7cSB case VK_MENU:
=Ay'\j MaskBits&=~ALTBIT;
]8c%)%Vi break;
Hy9c<X[F9 case VK_CONTROL:
g9XAUZe MaskBits&=~CTRLBIT;
/ta5d;@ break;
H E'1Wa0r case VK_SHIFT:
?uBZ"^' MaskBits&=~SHIFTBIT;
NQdz]o break;
0|^/ e-^ default: //judge the key and send message
jmH=W) break;
gjGKdTr' }
?C6DK{S( for(int index=0;index<MAX_KEY;index++){
^Fe%1Lnt if(hCallWnd[index]==NULL)
vRR(b!Lq continue;
e0nr dM[i if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
)^)j=xs {
*2(W`m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,2R7AHk bProcessed=TRUE;
*\M$pUS{ }
Ul`~d
!3zH }
Q~y) V }
K4[XP]\jr else if((lParam&0xc000ffff)==1){ //有键按下
>B~vE2^tQ~ switch(wParam)
?:
XY3!{ {
ylo/]pVs case VK_MENU:
1\{_bUZ& MaskBits|=ALTBIT;
Bw`7ND}&
break;
eM1=r:jgE case VK_CONTROL:
&{5v[:$ MaskBits|=CTRLBIT;
R=ipK63 break;
4L`<xX;:{ case VK_SHIFT:
!VXs
yH3r5 MaskBits|=SHIFTBIT;
}nO[;2Na break;
bFv,.(h' default: //judge the key and send message
^hN.FIzM break;
M`=bJO: }
[JzOsi~R for(int index=0;index<MAX_KEY;index++){
5{esL4k if(hCallWnd[index]==NULL)
i"HENJyCb continue;
'cpO"d?{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-<jd/ 5 {
Tx|}ke~ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
v
Wt{kg; bProcessed=TRUE;
S
Y7'S# }
l"ZfgJ}W }
$UX^$gG }
pT;{05 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
OZ9ud ]@\ for(int index=0;index<MAX_KEY;index++){
r@.3.Q if(hCallWnd[index]==NULL)
ifYC&5}SI continue;
,m08t9F if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p`CVq `k SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
B/n/bi8T //lParam的意义可看MSDN中WM_KEYDOWN部分
RhPEda2 }
9_07?`Jr
}
CB1AL]|3 }
jr=>L: return CallNextHookEx( hHook, nCode, wParam, lParam );
DJu&l }
OSDx &AS<2hB 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:
KXS{@/"-B P_Bhec|#fT BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
[&B}{6wry BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
@=0O'XM ^-|yF2>` 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:
3!OO_ |*5QFp LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
"92Z"I~1 {
-y+u0,=p. if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
>e4w8Svcy {
aglW\LT^ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
sA}X ha SaveBmp();
uQYBq)p| return FALSE;
[|NgrU_. }
HfN:oww …… //其它处理及默认处理
"\:ZH[j }
)RFE<
Qcj -T 5$l r8uc. z2% 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
t622b?w |}O9'fyU8 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
! 54(K6a[ }$zJdf,\ 二、编程步骤
"V>7u{T a BHV 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";
j+E[[
LM~,`#3Ru 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
pH'1be{K U_/<tWl\[3 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
"?yu^ 2Y2J)5, 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
GkutS.2G# JuD$CHg;# 5、 添加代码,编译运行程序。
FQ72VY &7gE=E(M 三、程序代码
:2\H>^uV u\]aUP
e ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
)t/[z3rn #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
BUozpqN} #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
YnCWmlC #if _MSC_VER > 1000
7T)J{:+0!| #pragma once
pKM5<1J #endif // _MSC_VER > 1000
q%/ciPgE #ifndef __AFXWIN_H__
g3i !> #error include 'stdafx.h' before including this file for PCH
IIW6;jS #endif
1 ^k#g, #include "resource.h" // main symbols
*"%MT: class CHookApp : public CWinApp
-XSu;'4q {
aKly1G public:
#CM^f^* CHookApp();
?D^l&`S // Overrides
}g? 9/)z // ClassWizard generated virtual function overrides
4*<27 //{{AFX_VIRTUAL(CHookApp)
A^a9,T public:
1Xv- e8M virtual BOOL InitInstance();
xP1`FSO8= virtual int ExitInstance();
#&hu-gMV //}}AFX_VIRTUAL
_DAAD,'<a //{{AFX_MSG(CHookApp)
F> F&+63Q- // NOTE - the ClassWizard will add and remove member functions here.
f17pwJ~= // DO NOT EDIT what you see in these blocks of generated code !
gXR1nnK //}}AFX_MSG
%mda=%Yn DECLARE_MESSAGE_MAP()
g!k'tizYD };
mB:I8g7 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
54A ndyeA BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
"I|[m%\ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
u/D=&"tL BOOL InitHotkey();
d9hJEu!Lu BOOL UnInit();
p:,(r{*? #endif
$g|/.XH% Tn# >"Ag //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
igV4nL #include "stdafx.h"
^PCshb## #include "hook.h"
D:uBr|(' #include <windowsx.h>
a*8^M\>m4 #ifdef _DEBUG
Jk.Ec)w #define new DEBUG_NEW
xY/
S;dE #undef THIS_FILE
U 9?!|h;7 static char THIS_FILE[] = __FILE__;
\mt0mv;c #endif
4YVxRZ1[3 #define MAX_KEY 100
XG5mfKMt+ #define CTRLBIT 0x04
|!\(eLR9> #define ALTBIT 0x02
<*Kj7o{Qn #define SHIFTBIT 0x01
wec|~Rc- #pragma data_seg("shareddata")
UeVRd HHOOK hHook =NULL;
P2nb&lVdu UINT nHookCount =0;
?hu$ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
%h ?c static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
j}=$2|}8{ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
"[.adiw static int KeyCount =0;
mn=G6h
T}W static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
(+Yerc.NQt #pragma data_seg()
Jmln*,Ol7 HINSTANCE hins;
h5bQ void VerifyWindow();
/^E2BRI BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
\pzqUTk //{{AFX_MSG_MAP(CHookApp)
CapWn~*g // NOTE - the ClassWizard will add and remove mapping macros here.
W*hRYgaX3 // DO NOT EDIT what you see in these blocks of generated code!
X9f!F2x //}}AFX_MSG_MAP
Q<y&*o3YF| END_MESSAGE_MAP()
eeuTf %#rH~E CHookApp::CHookApp()
3N) bJ {
3B(6^iS // TODO: add construction code here,
\advFKN // Place all significant initialization in InitInstance
+fd^$Qd%K }
RNyw`> S-"OfWg< CHookApp theApp;
+_8*;k@F' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
r@3VN~ {
=<.8 BOOL bProcessed=FALSE;
D]9I-| if(HC_ACTION==nCode)
VP$ `.y {
'm@0[i if((lParam&0xc0000000)==0xc0000000){// Key up
"28b&pm switch(wParam)
d#N<t` {
r^?Q o
case VK_MENU:
RZ!-,|"cwL MaskBits&=~ALTBIT;
sskwJu1 break;
,%+i}H,3 case VK_CONTROL:
6xs_@Vk|d MaskBits&=~CTRLBIT;
/-wAy-W break;
kzhncku case VK_SHIFT:
JkazB1h MaskBits&=~SHIFTBIT;
i6)$pARp break;
j*m7&wOE default: //judge the key and send message
_MfB,CS
break;
_5vAnt* }
We#u-#k_O for(int index=0;index<MAX_KEY;index++){
[N}:Di,S if(hCallWnd[index]==NULL)
yWa-iHWC continue;
y!SElKj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZM/*cA!" {
n|vIo) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
swvn*xr bProcessed=TRUE;
Z8P{Cr~U9 }
e9;<9uX }
">}l8MA }
y K~;LV else if((lParam&0xc000ffff)==1){ //Key down
I| qoH N,g switch(wParam)
dnVl;L8L3 {
@,D 3$P8} case VK_MENU:
K@P5]}'# MaskBits|=ALTBIT;
)8ejT6r break;
)miY>7K case VK_CONTROL:
9 veq MaskBits|=CTRLBIT;
H/>86GG break;
;E/:_DWPD case VK_SHIFT:
k=j--`$8k MaskBits|=SHIFTBIT;
<@9p|[! break;
=PiDZS^" default: //judge the key and send message
12*'rU;* break;
AvdxDN }
P
agzp%m for(int index=0;index<MAX_KEY;index++)
] Cpd`}' {
MP\$_;&xB if(hCallWnd[index]==NULL)
P SDzs\s continue;
A.<HOx if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&k+G^ !=s# {
<o^_il$W SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
$j*j {}K bProcessed=TRUE;
w#wlZ1f }
[?mDTD8zU }
Y,OSQBgk }
TTaSg\K if(!bProcessed){
#(C2KRRiA for(int index=0;index<MAX_KEY;index++){
*a* \E
R if(hCallWnd[index]==NULL)
E%\j R continue;
5
T1M:~u i if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Q}~of}h/ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Z-`j)3Y }
JnCp'` }
]%jlaXb }
c#M'Mye return CallNextHookEx( hHook, nCode, wParam, lParam );
(.,`<rXw }
ps1ndGp~# 3!M;Z7qF] BOOL InitHotkey()
beFVjVVHq {
oR>o/$z$)g if(hHook!=NULL){
F23/|q{{ nHookCount++;
4:-h\% return TRUE;
!uLW-[F, }
QLYb>8?"C else
lwhAF, '$ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
iva&W if(hHook!=NULL)
W8j)2nKD nHookCount++;
5;5;bBo~ return (hHook!=NULL);
mAh0xgm }
%pmowo~{ BOOL UnInit()
5inmFT?9Z {
Q.Hy"~ if(nHookCount>1){
mRB-} nHookCount--;
@BWroNg{ return TRUE;
n<6p 0w }
1J<Wth{ BOOL unhooked = UnhookWindowsHookEx(hHook);
{7&(2Z]z if(unhooked==TRUE){
v]|^.x: nHookCount=0;
m`!C|?hu hHook=NULL;
bj4cW\b( }
`T2RaWR4= return unhooked;
%;kr%%t% }
=s`\W7/;{- 1UX"iOx( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
59gt#1k {
Szrr`.'] BOOL bAdded=FALSE;
+HNY!fv9 for(int index=0;index<MAX_KEY;index++){
cUssF%ud] if(hCallWnd[index]==0){
\D(6t!Ox hCallWnd[index]=hWnd;
GGk.-Ew@ HotKey[index]=cKey;
0qXd?z$ HotKeyMask[index]=cMask;
!_rAAY bAdded=TRUE;
[=079UN-X KeyCount++;
a9PSg/p break;
_?&$@c }
4jefU}e9# }
Reca5r1O return bAdded;
zK893) }
So?SBh1C `9rwu:3i BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@Ong+^m|PC {
5qtZ`1Hq BOOL bRemoved=FALSE;
Q{6Bhx *> for(int index=0;index<MAX_KEY;index++){
ss'#sPX if(hCallWnd[index]==hWnd){
:U!kn b"/> if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
mw%do&e hCallWnd[index]=NULL;
e`ti*1]q HotKey[index]=0;
4]O{Nko) HotKeyMask[index]=0;
f3Ior.n( bRemoved=TRUE;
P.mz$M KeyCount--;
-o*IJQ_ break;
T8E=}!68w} }
d{2+>
>d }
1P(rgn:8e }
rLO1Sv return bRemoved;
&1Dq3%$c }
@ qWgokf r#
MJ void VerifyWindow()
tr0P;}= {
_cdrz)T for(int i=0;i<MAX_KEY;i++){
+@[T0cXp if(hCallWnd
!=NULL){ ScU?T<u:i
if(!IsWindow(hCallWnd)){ W|J8QNL?jm
hCallWnd=NULL; ?{l}35Q.@
HotKey=0; {h/[!I`
HotKeyMask=0; :GXiA
KeyCount--; ?.E6Ube
} ^6s<
} )8vz4e Y
} @Z> {/
} 'PRsZ`x.
R=P=?U.
BOOL CHookApp::InitInstance() Y`jvza%
{ : xI SS
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (#GOXz
hins=AfxGetInstanceHandle(); OW1i{
InitHotkey(); I\E`xkbBu
return CWinApp::InitInstance(); Cmg(#$X
} Q!8AFLff4
(hej
3;W
int CHookApp::ExitInstance() r'xZF~}k"~
{ QPf*!E
VerifyWindow(); xo2PxUO
UnInit(); WrH7tz
return CWinApp::ExitInstance(); 4b]/2H
} \U $'3M
p2 u*{k{
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9}4P%>_
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ! iuDmL
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }SYR)eE\
#if _MSC_VER > 1000 /.r|ron:e
#pragma once |kJ'FZZd
#endif // _MSC_VER > 1000 =W'a6)WE
3Ob"R%Yo
class CCaptureDlg : public CDialog vI3L <[W
{ i"mN0%
// Construction i[1K~yXq:
public: a^_\ #,}
BOOL bTray; 0nUcUdIf+
BOOL bRegistered; F#_JcEE
BOOL RegisterHotkey(); 0`%eP5
UCHAR cKey; \M0-$&[+Z
UCHAR cMask; P34UD:
void DeleteIcon(); 7(cRm$)L
void AddIcon(); 1!_$HA
UINT nCount; [. Vy
void SaveBmp(); {`,dWjy{%
CCaptureDlg(CWnd* pParent = NULL); // standard constructor _/Ky;p.
// Dialog Data Xkcy~e
//{{AFX_DATA(CCaptureDlg) tKOTQ8i4
enum { IDD = IDD_CAPTURE_DIALOG }; vYQ0e:P
CComboBox m_Key; $SAq/VHI1]
BOOL m_bControl; @9_H4V
BOOL m_bAlt; h>\T1PM
BOOL m_bShift; 5(RFkZn4[
CString m_Path; {3n|=
CString m_Number; JDPn
//}}AFX_DATA V45A>#?U
// ClassWizard generated virtual function overrides 87WIDr
//{{AFX_VIRTUAL(CCaptureDlg) ..BIoSrj
public: uYVlF@]
virtual BOOL PreTranslateMessage(MSG* pMsg); CT5\8C
protected: l~P%mVC3m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support T-e'r
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7\x7ySM
//}}AFX_VIRTUAL ZlQ@k{Es~
// Implementation ;f,`T
protected: Xc"l')1H
HICON m_hIcon; 3!E*h0$}
// Generated message map functions ZL/iX~}a'
//{{AFX_MSG(CCaptureDlg) {8+FxmH
virtual BOOL OnInitDialog(); ROcI.tL
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 8R?X$=$]!.
afx_msg void OnPaint(); "Bl]_YPv
afx_msg HCURSOR OnQueryDragIcon(); ;e,_F/@`
virtual void OnCancel(); q.sErr[zc
afx_msg void OnAbout(); tt5t(+5j
afx_msg void OnBrowse(); !p$HS0c
afx_msg void OnChange(); P^9y0Q
//}}AFX_MSG BG ,ln(Vz
DECLARE_MESSAGE_MAP() 6S]K@C=r
}; *IBT!@*Q&
#endif <u "xHl8Io
4<%(Y-_sF
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ..jc^'L
#include "stdafx.h" cbe&SxJ
#include "Capture.h" 7A:k
#include "CaptureDlg.h" Do1 Ip&X
#include <windowsx.h> .\Gl)W
#pragma comment(lib,"hook.lib") e4:,W+g,9
#ifdef _DEBUG ay~c@RXW
#define new DEBUG_NEW {"{kWbXZ
#undef THIS_FILE matW>D;J
static char THIS_FILE[] = __FILE__; t&scvXh
#endif Fg` P@hC
#define IDM_SHELL WM_USER+1 "^M/iv(
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $sF'Sr{)y
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aumWU{j=
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }%e"A4v
class CAboutDlg : public CDialog %f[0&)1!.v
{ B=dF\.&Z
public: z+3GzDLy
CAboutDlg(); HURrk~[
// Dialog Data iCd$gwA>F
//{{AFX_DATA(CAboutDlg) Pw c)u&
enum { IDD = IDD_ABOUTBOX }; MnToL@
//}}AFX_DATA F)fCj^zL
// ClassWizard generated virtual function overrides _:dt8+T#
//{{AFX_VIRTUAL(CAboutDlg) =QdHji/sB
protected: 3=YK" 5J
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q8DSKi
//}}AFX_VIRTUAL ,uz+/K%OA5
// Implementation /G[2
protected: nV`n=x
//{{AFX_MSG(CAboutDlg) DX3xWdnr
//}}AFX_MSG Xn:5pd;?B6
DECLARE_MESSAGE_MAP() }ACWSk WK
}; (!'=?B "
KWuc*!
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Eo
h4#fZ\N
{ ,_SE!iL
//{{AFX_DATA_INIT(CAboutDlg) j&6O1
//}}AFX_DATA_INIT {7EnM1]
} wY$'KmNW
^7b[spqE
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $a
/jfpV
{ Oe#*-
CDialog::DoDataExchange(pDX); H]]UsY`
//{{AFX_DATA_MAP(CAboutDlg) %K9pnq/T^
//}}AFX_DATA_MAP .kbo]P
} Z\1*g k
6Bv!t2
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) lI,lR
//{{AFX_MSG_MAP(CAboutDlg) Q4~/Tl;
// No message handlers [Eq7!_3
//}}AFX_MSG_MAP |A .U~P):
END_MESSAGE_MAP() {TmrWFo
n,,hE_
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #.Q3}[M
: CDialog(CCaptureDlg::IDD, pParent) 9^yf'9S1
{ a"ct"g=
//{{AFX_DATA_INIT(CCaptureDlg) /-C`*P=:u
m_bControl = FALSE; RC[mpR;2
m_bAlt = FALSE; <[*%d~92z
m_bShift = FALSE; oc|%|pmRd<
m_Path = _T("c:\\"); .$ o0$`}
m_Number = _T("0 picture captured."); U3UKu/Z
nCount=0; |gV$ks\<
bRegistered=FALSE; )># Y,/q
bTray=FALSE; m=m T`EP
//}}AFX_DATA_INIT GbFtX\s+5j
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]t2zwHo#
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OEZ`5"j
} 3y#U|&]{
kU75
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) rnOg;|u8
{ vk:k ~
CDialog::DoDataExchange(pDX); YGdzA]3>
//{{AFX_DATA_MAP(CCaptureDlg) ^-wdIu~p?
DDX_Control(pDX, IDC_KEY, m_Key); n0\k(@+k
DDX_Check(pDX, IDC_CONTROL, m_bControl); r%:Q(|v?
DDX_Check(pDX, IDC_ALT, m_bAlt); X=1Po |
DDX_Check(pDX, IDC_SHIFT, m_bShift); s%cfJe_k
DDX_Text(pDX, IDC_PATH, m_Path); lwVo%-
DDX_Text(pDX, IDC_NUMBER, m_Number); K3Sa6"U
//}}AFX_DATA_MAP S]"U(JmW\
} P0mY/bBU
MbT;]Bo
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) p1BMQ?=($
//{{AFX_MSG_MAP(CCaptureDlg) MBIlt
1P
ON_WM_SYSCOMMAND() d O})#50f
ON_WM_PAINT() 1QA{NAnu&
ON_WM_QUERYDRAGICON() R>C^duos.
ON_BN_CLICKED(ID_ABOUT, OnAbout) <2.87:
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sxK|0i}6
ON_BN_CLICKED(ID_CHANGE, OnChange) tyI!y~-z
//}}AFX_MSG_MAP $`a>y jma
END_MESSAGE_MAP() >b1#dEY
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BOOL CCaptureDlg::OnInitDialog() q
HU}EEv
{ Tr6J+hS
CDialog::OnInitDialog(); }CM</
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }EMds3<
ASSERT(IDM_ABOUTBOX < 0xF000); R(^2+mV?
CMenu* pSysMenu = GetSystemMenu(FALSE); 7A,lQh
if (pSysMenu != NULL) xs}3=&c(
{ ;h"St0
CString strAboutMenu; B=<Z@u
strAboutMenu.LoadString(IDS_ABOUTBOX); hf`5NcnP
if (!strAboutMenu.IsEmpty()) VG=mA4Dd
{ 5LX'fL7zU
pSysMenu->AppendMenu(MF_SEPARATOR); .#OD=wkN0
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2 -C*RHRx
} I$y6N"|
} w7d<Ky_C
SetIcon(m_hIcon, TRUE); // Set big icon o9XT_!Cwg
SetIcon(m_hIcon, FALSE); // Set small icon r3}Q1b&
m_Key.SetCurSel(0); *x<3=9V
RegisterHotkey(); ?cB:1?\j
CMenu* pMenu=GetSystemMenu(FALSE); ob_*fP
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); /19ZyQw9
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6OPYq*|
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,_iR
return TRUE; // return TRUE unless you set the focus to a control >^Z==1
} p"dK,A5#)
x| =]Xxco
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J1\H^gyW)
{ uD0<|At/
if ((nID & 0xFFF0) == IDM_ABOUTBOX) i]{-KZC
{ >qL-a*w:a
CAboutDlg dlgAbout; j*fs [4
dlgAbout.DoModal(); H[DBL
} vU9j|z
else MXP3ZN'
{ 3 q^^Os
CDialog::OnSysCommand(nID, lParam); X+%5q =N
} s[n*fV']A
} K\VL[HP-
wfMtWXd;KB
void CCaptureDlg::OnPaint() ]n
'FD|
{ L5RBe
if (IsIconic()) 1
k\~%
{ uLq%Nu
CPaintDC dc(this); // device context for painting S2\|bs7;J,
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %2ZWSQD
// Center icon in client rectangle [dIlt"2fV
int cxIcon = GetSystemMetrics(SM_CXICON); *RllKP Y)
int cyIcon = GetSystemMetrics(SM_CYICON); KB5<)[bs
CRect rect; 9`FPV`/
GetClientRect(&rect); W }
int x = (rect.Width() - cxIcon + 1) / 2; -L6V)aK&
int y = (rect.Height() - cyIcon + 1) / 2; [rO TWN
// Draw the icon rYfN
dc.DrawIcon(x, y, m_hIcon); \\(3gB.Gd
} HxnWM\ p
else sMDHg
{ _0Z8V[
CDialog::OnPaint(); [9H986=
} &57s//PrX
} ]b&O#D9
#HyE-|_C
HCURSOR CCaptureDlg::OnQueryDragIcon() ;Ob`B@!=b
{ 2S@aG%-)
return (HCURSOR) m_hIcon; gw_]Y^U
} I=c}6
!)//b]
void CCaptureDlg::OnCancel() g&?RQ
{ !WgVk7aP`
if(bTray) C#oH7o+_.
DeleteIcon(); [eLU}4v{
CDialog::OnCancel(); N6<G`k,
} \ sc's7
>mCS`D8
void CCaptureDlg::OnAbout() egn9O
{ iZ;y(
CAboutDlg dlg; "bmWr)
dlg.DoModal(); 7blo<|9
} 4iC=+YUn
E%e2$KfD
void CCaptureDlg::OnBrowse() =LyRCrA
{ aQ#6PO7.Z
CString str; {Q/_I@m].
BROWSEINFO bi; EF5:$#
char name[MAX_PATH]; 4<<T#oW.:G
ZeroMemory(&bi,sizeof(BROWSEINFO)); i"GCm`
bi.hwndOwner=GetSafeHwnd(); q'CtfmI`r=
bi.pszDisplayName=name; yr[HuwU
bi.lpszTitle="Select folder"; 3aERfIJyE
bi.ulFlags=BIF_RETURNONLYFSDIRS; C| g]Y 7
LPITEMIDLIST idl=SHBrowseForFolder(&bi); Jj'dg6QY'
if(idl==NULL) Nu4PY@m]C
return; Kq&JvY^
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?5Q_G1H&
str.ReleaseBuffer(); Br}0dha3E
m_Path=str; u8N"i),
if(str.GetAt(str.GetLength()-1)!='\\') .]y"04@]
m_Path+="\\"; )o N#%%SB<
UpdateData(FALSE); *$*V#,V-
} b3^d!#KVM
MzpDvnI9
void CCaptureDlg::SaveBmp() 2&KM&NX~
{ 2E_d$nsJ
CDC dc; p`T,VU&.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); P+(q38f[
CBitmap bm; jImw_Q
int Width=GetSystemMetrics(SM_CXSCREEN); N}X7g0>hV
int Height=GetSystemMetrics(SM_CYSCREEN); %WO4uOi:@
bm.CreateCompatibleBitmap(&dc,Width,Height); pUm|e5
CDC tdc; ]]!&>tOlI
tdc.CreateCompatibleDC(&dc); !J k|ha~r
CBitmap*pOld=tdc.SelectObject(&bm); Wo,"$Z6B
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); K;P<c,9X/
tdc.SelectObject(pOld); ;pVnBi
BITMAP btm; -XMWN$Ah
bm.GetBitmap(&btm); ^w+)A;?W
DWORD size=btm.bmWidthBytes*btm.bmHeight; DU lvlQW
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =BVBCh
BITMAPINFOHEADER bih; }U_z XuUz
bih.biBitCount=btm.bmBitsPixel; NKRI|'Y,
bih.biClrImportant=0; AEO7I
f@
bih.biClrUsed=0; $G D@e0
bih.biCompression=0; *^s^{0Ad
bih.biHeight=btm.bmHeight; &A)u!l Ue
bih.biPlanes=1; )Bpvi4O
bih.biSize=sizeof(BITMAPINFOHEADER);
?8TIPz J
bih.biSizeImage=size; OiJz?G:m
bih.biWidth=btm.bmWidth;
ZO\x|E!b
bih.biXPelsPerMeter=0; ~ "stI
bih.biYPelsPerMeter=0; ]Z=O+7(r
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Vohd
d_x
static int filecount=0; =P7!6V\f
CString name; lL6W:Fq@(
name.Format("pict%04d.bmp",filecount++); Y9ipy_@_?
name=m_Path+name; bO6LBSZx]
BITMAPFILEHEADER bfh; <NlL,
bfh.bfReserved1=bfh.bfReserved2=0; m={TBV,L
bfh.bfType=((WORD)('M'<< 8)|'B'); ~X<Ie9m1x
bfh.bfSize=54+size; NsUP0B}.
bfh.bfOffBits=54; Uk<2XGj
CFile bf; lm\~_ 4l1
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ DWmViuZmL
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "C'T>^qw*
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u3])_oj=
bf.WriteHuge(lpData,size); ~=i<O&nai
bf.Close(); jPA^SxM
nCount++; ~xakz BE
} 1b`WzoJgH
GlobalFreePtr(lpData); L2`a| T=
if(nCount==1)
7>!Rg~M
m_Number.Format("%d picture captured.",nCount); l2
mO{'|C
else fUa[3)I
m_Number.Format("%d pictures captured.",nCount); 4elA<<
UpdateData(FALSE); Jx3fS2
} ! w2BD^V-
MVXy)9q
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) v|@1W Uc,g
{ N5jJ,iz
if(pMsg -> message == WM_KEYDOWN) /^Ng7Mi!
{ ![3l
K
if(pMsg -> wParam == VK_ESCAPE) vD3j(d
return TRUE; SU>cJ*
if(pMsg -> wParam == VK_RETURN) _8ubo\M~
return TRUE; /& wA$h
} /@feY?glc
return CDialog::PreTranslateMessage(pMsg); &)GlLpaT
} P)rz%,VF+
_t.Ub:
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M~LYq
{ JLu>w:\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j*#k%;c
SaveBmp(); cd:VFjT
return FALSE; ObEp0-^?
} W'}^m*F
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E-"b":@:
CMenu pop; ~?<VT
k
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^gdv:[m
CMenu*pMenu=pop.GetSubMenu(0); 7?a!x$-U(
pMenu->SetDefaultItem(ID_EXITICON); bXRSKp[$
CPoint pt; (bD'SWE
GetCursorPos(&pt); vR?E'K3
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SnFAv7_
if(id==ID_EXITICON) (ioJ G-2u
DeleteIcon(); O~&j}WN
else if(id==ID_EXIT) _ Y8jl,J
OnCancel(); J*m~fZ^
return FALSE; f3"sKL4|
} y7/=-~
LRESULT res= CDialog::WindowProc(message, wParam, lParam); CN!~(1v
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UMj8<Lq)j
AddIcon(); H0?Vq8I?
return res; BX-fV|
} >%i]p
|tdsg
void CCaptureDlg::AddIcon() =At)?A9[
{ "HrZv+{
NOTIFYICONDATA data; .qD=u1{p9
data.cbSize=sizeof(NOTIFYICONDATA); 8rpr10;U
CString tip; TT3\c,cs
tip.LoadString(IDS_ICONTIP); Hwiftx
data.hIcon=GetIcon(0); #!R =h|
data.hWnd=GetSafeHwnd(); 3iBUIv
strcpy(data.szTip,tip); ;noZmPa
data.uCallbackMessage=IDM_SHELL; *!&,)''
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; J[jzkzSu`
data.uID=98; #Pe|}!)u
Shell_NotifyIcon(NIM_ADD,&data); I.hy"y2&
ShowWindow(SW_HIDE); B
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bTray=TRUE; S7f"\[Aw
} j5V{,lf
WdJJt2'
void CCaptureDlg::DeleteIcon() r>Cv@4/j
{ . E?a
NOTIFYICONDATA data; {RHa1wc
data.cbSize=sizeof(NOTIFYICONDATA); |rwx;+
data.hWnd=GetSafeHwnd(); 9M Ug/
data.uID=98; p n(y4we
Shell_NotifyIcon(NIM_DELETE,&data); 3"p'WZ>
ShowWindow(SW_SHOW); ]=?.LMjnH
SetForegroundWindow(); ^Q5advxuq
ShowWindow(SW_SHOWNORMAL); 8 GW0w
bTray=FALSE; !X ={a{<,T
} S9lT4
NZ:KJ8ea"
void CCaptureDlg::OnChange() iNv"!'|
{ 84f^==Y
RegisterHotkey(); QM4O|x[
} @nxpcHj
I,@
6w
BOOL CCaptureDlg::RegisterHotkey() +~za6
{ O
2W2&vY
UpdateData(); rYPj3!#
UCHAR mask=0; 0+6=ag%
UCHAR key=0; @\|Fd)
if(m_bControl) %%qg<iO_
mask|=4; Da&Brm
if(m_bAlt) 2"8qtG`Et
mask|=2; ` 3h,Cy^
if(m_bShift) Z@6xu;O
mask|=1; E<r<ObeRv`
key=Key_Table[m_Key.GetCurSel()]; UthM?g^
if(bRegistered){
KU 98"b5
DeleteHotkey(GetSafeHwnd(),cKey,cMask); (65|QA
bRegistered=FALSE; JlhI3`X;/
} 3%YDsd vQx
cMask=mask; 6h{>U*N"&d
cKey=key; gX;)A|9e
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); x yyEaB
return bRegistered; UKzXz0
} R7 ^f|/l
't'2z
四、小结 o>e -M
yt1dYF0Xq
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。