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:
Z*P/ ubV'
m!zvt
一、实现方法
?lqqu#;8 Nq9pory^ 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:
C%z9Q D]d! lMK/ #pragma data_seg("shareddata")
sAO/yG HHOOK hHook =NULL; //钩子句柄
\8*j"@ !H UINT nHookCount =0; //挂接的程序数目
A"DGn static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
Te!eM{_$T static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
lpd~U 2& static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
ZH=Bm^ static int KeyCount =0;
y+wy<[u static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
UCmJQJc #pragma data_seg()
r.@UH-2c W|;`R{<I% 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
)2Q0NbDn ;=%cA#}_0 DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
IY~I=} ?3LV$S)U BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*XDe:A cKey,UCHAR cMask)
u<n['Ur}| {
<Qbqxw BOOL bAdded=FALSE;
kVeY} 8 for(int index=0;index<MAX_KEY;index++){
rWJRoGk/ if(hCallWnd[index]==0){
B\|^$z2 hCallWnd[index]=hWnd;
jA@
uV,w HotKey[index]=cKey;
=JTwH>fD HotKeyMask[index]=cMask;
m-[xrVV bAdded=TRUE;
S"+#=C KeyCount++;
),o=~,v: break;
\(?d2$0m }
BB/c5?V }
qbD_ return bAdded;
ndBqXS }
ok-q9dM //删除热键
_M>S =3w BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cy8r}wD {
GAR6nJCz BOOL bRemoved=FALSE;
IAmMO[9H for(int index=0;index<MAX_KEY;index++){
RT%{M1tkS if(hCallWnd[index]==hWnd){
isnpSN"z if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
ev7A;; hCallWnd[index]=NULL;
Nb0T3\3W HotKey[index]=0;
RY,L'GtO HotKeyMask[index]=0;
FD8 bRemoved=TRUE;
't\sXN+1 KeyCount--;
pP\^bjI break;
:-2sKD y }
a[=B?Bd }
w(Mi? }
j)mS3#cH return bRemoved;
#5{lOeN }
Q\^BOdX^` tnXW7ej ^ tuo'Uk) DLL中的钩子函数如下:
:K \IS ` \u/=?b LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
#)T'a {
I$TD[W BOOL bProcessed=FALSE;
s,laJf if(HC_ACTION==nCode)
Q."rE"}< {
FGo)]U if((lParam&0xc0000000)==0xc0000000){// 有键松开
>^f]Lgp switch(wParam)
wC<FF2T {
85H*Xm?d# case VK_MENU:
U|+`Eth8( MaskBits&=~ALTBIT;
.p~.S&) break;
x;7p75Wm case VK_CONTROL:
LKud' MaskBits&=~CTRLBIT;
7,{!a56zX break;
.KYDYdoS' case VK_SHIFT:
1ww~!R MaskBits&=~SHIFTBIT;
Y=UN`vRR break;
kgX"I ?>d default: //judge the key and send message
-,"eN}P^ break;
?zXlLud8 }
${UH!n{ for(int index=0;index<MAX_KEY;index++){
!NhVPb, if(hCallWnd[index]==NULL)
U,`F2yD/! continue;
4d-"kx3X if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{RH)&k&% {
*^%ohCUi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
`7
J4h9K bProcessed=TRUE;
y(r(q }
a3_pF~Qx }
pmDFmES }
XCO;t_% else if((lParam&0xc000ffff)==1){ //有键按下
8rjiW# switch(wParam)
Xu[A,6 {
k'd=|U;(FV case VK_MENU:
v$|cF'yyF= MaskBits|=ALTBIT;
W'C~{}c= break;
OWHHN< case VK_CONTROL:
R?kyJ4S MaskBits|=CTRLBIT;
)G|'PXI@, break;
eq36mIo case VK_SHIFT:
^pvnUODW[ MaskBits|=SHIFTBIT;
,-Yl%R.W= break;
Qnv)\M1 default: //judge the key and send message
E"Y[k8-:2/ break;
zO)3MC7l* }
K!SFS for(int index=0;index<MAX_KEY;index++){
>VvA&p71b if(hCallWnd[index]==NULL)
k iY1 continue;
&B ^LaRg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oei2$uu {
BP0*`TY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
5+iXOs< bProcessed=TRUE;
YZ^;xV }
HY7#z2L }
b(:U]>J }
WQYw@M~4Q! if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
e[L%M:e9U for(int index=0;index<MAX_KEY;index++){
IM~2=+ if(hCallWnd[index]==NULL)
[Xo[J?w],2 continue;
eq$.np if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|Skhx9}; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kG3m1: : //lParam的意义可看MSDN中WM_KEYDOWN部分
Zm/I & }
Gmh6|Dsg }
.OSFLY#[? }
IX 2 dic' return CallNextHookEx( hHook, nCode, wParam, lParam );
O/PO?>@-/ }
|]x>|Z?/u </jTWc'} 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:
IpI|G!Y, p u6@X7W" BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
@
M BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
nK9?|@S*' /}$D&KwYg 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
6Y&`mgMF' '/QS
sZR LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
}w/6"MJ[n {
Q}:#Hz?U if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
oD&axNk {
zP|^) h5 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
e4(E!;Z!QF SaveBmp();
2N[/Cc2Tg/ return FALSE;
4
oZm0
}
*32hIiCm …… //其它处理及默认处理
R*r;`x }
F!&$Z
. LF\HmKM, Q?]-/v 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。
%{;1i 0;2"X[e 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。
-]kvM aV`_@F-8 二、编程步骤
5l4YYwd>v ~"nF$DB 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Wg!JQRHtT fuF!3Q 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
.6[7D r6gfxW5 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
\2!1fN D,P{ ,/ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
qPF`=# @p ZjJ<9QM 5、 添加代码,编译运行程序。
Z|$M 9E N`et]'_A} 三、程序代码
!!?TkVyEyM }WDzzjDR+ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
k{ ~0BK #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
wGg_ vAn #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
FS^~e-A #if _MSC_VER > 1000
Ra/Pk G-7 #pragma once
VDTt}J 8 #endif // _MSC_VER > 1000
zv0bE?W9 #ifndef __AFXWIN_H__
u N8RG_Mb #error include 'stdafx.h' before including this file for PCH
^xm%~ #endif
Mqv[7.| #include "resource.h" // main symbols
h0a|R4J class CHookApp : public CWinApp
D0^h;wJ=4+ {
/odDJxJ
k public:
.bY
R CHookApp();
`IV7\}I| // Overrides
R9\ )a2 // ClassWizard generated virtual function overrides
Yhte&,D" //{{AFX_VIRTUAL(CHookApp)
n#^ii/H public:
e2qSU[ virtual BOOL InitInstance();
'e/wjV virtual int ExitInstance();
B,A,5SuMk //}}AFX_VIRTUAL
fLS].b]1N //{{AFX_MSG(CHookApp)
L@s_)?x0 // NOTE - the ClassWizard will add and remove member functions here.
-}(2}~{e( // DO NOT EDIT what you see in these blocks of generated code !
l}SHR|7< //}}AFX_MSG
o3YW(%cYR DECLARE_MESSAGE_MAP()
0p]v#z} };
@2g
<d LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
hjD%=Ri0Z BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
gVNoC-n) BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
F.),|t$\ BOOL InitHotkey();
s@IgaF { BOOL UnInit();
Z\3~7Ek2m #endif
{$g3R@f^~ L3=5tuQ[5 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
,&.$r/x|? #include "stdafx.h"
+/ rt'0o #include "hook.h"
C),i#v #include <windowsx.h>
2Gh&h( #ifdef _DEBUG
lg
+ >.^7k #define new DEBUG_NEW
JED\"(d( #undef THIS_FILE
< 1[K1'7h static char THIS_FILE[] = __FILE__;
sGa}Cf;H@g #endif
BU#3fPl #define MAX_KEY 100
3$ wK*xK #define CTRLBIT 0x04
CEW1T_1U<\ #define ALTBIT 0x02
LXqPNVp# #define SHIFTBIT 0x01
A `{hKS #pragma data_seg("shareddata")
}O Y/0p-Z HHOOK hHook =NULL;
XY#.?<"Q8 UINT nHookCount =0;
X|-[i hp; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
dXfLN<nD>U static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
0j;q^> static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
E!_3?:[S_ static int KeyCount =0;
E>+>!On)b static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
XBoq/kbw! #pragma data_seg()
|az2vD6P HINSTANCE hins;
)k;;O7Ck void VerifyWindow();
5|5p -B BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
HuJc*op-6 //{{AFX_MSG_MAP(CHookApp)
c?N,Cd~q // NOTE - the ClassWizard will add and remove mapping macros here.
XO+rg&Pu // DO NOT EDIT what you see in these blocks of generated code!
/,`OF/% //}}AFX_MSG_MAP
WdH/^QvTP END_MESSAGE_MAP()
h+ud[atk. tuLNGU CHookApp::CHookApp()
IVY)pS"pR" {
@{W"mc+ // TODO: add construction code here,
|kP utB // Place all significant initialization in InitInstance
u"4B5D }
Evd|_ W- hH HQmK<r
CHookApp theApp;
axpZ`BUc LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
)+R n[MMp {
wZs 2aa BOOL bProcessed=FALSE;
qV6WT&)T if(HC_ACTION==nCode)
uFhaN\S {
[dAQrou6P if((lParam&0xc0000000)==0xc0000000){// Key up
UWidT+'Sa switch(wParam)
J ZkQ/vp( {
Ptf(p` case VK_MENU:
a>x6n3{ MaskBits&=~ALTBIT;
*MB>,HU break;
g(Q1d-L4e case VK_CONTROL:
z_N";Rn MaskBits&=~CTRLBIT;
aCI3Tx&2qT break;
K{{_qFj@<y case VK_SHIFT:
zCuB+r=C MaskBits&=~SHIFTBIT;
fjOq@thD break;
T;?k]4.X default: //judge the key and send message
aL%E# break;
|R1T;J<[ }
i[@13kr for(int index=0;index<MAX_KEY;index++){
yOt#6Vw if(hCallWnd[index]==NULL)
H>A6VDu continue;
mf)+ 5On if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
pQK SPr {
=MMd& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
l<BV{Gl bProcessed=TRUE;
!1fZ7a }
),-gy~ }
QeG9CS)E}j }
|?ssHW else if((lParam&0xc000ffff)==1){ //Key down
HC/z3b; switch(wParam)
e"52'zAV- {
~7 U~ case VK_MENU:
r4fHD~#l{ MaskBits|=ALTBIT;
naW!b&: break;
>W;NMcN~ case VK_CONTROL:
Id##367R MaskBits|=CTRLBIT;
P/dnH break;
"X8jpg case VK_SHIFT:
c~?Zmdn: MaskBits|=SHIFTBIT;
r`.N? break;
[IQ|c?DxpL default: //judge the key and send message
q+y\pdhdO break;
&'x~<rx }
0=#>w_B for(int index=0;index<MAX_KEY;index++)
mr^3Y8$s {
2Jio_Hk if(hCallWnd[index]==NULL)
]Ob|!L( continue;
18!y7
_cFT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\1Xk[% {
dniU{v SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
:#pdyJQ_ bProcessed=TRUE;
6oNcj_?7?q }
~e 1l7H; }
X
3$ W60Q }
>
'hM"4f if(!bProcessed){
6e B; for(int index=0;index<MAX_KEY;index++){
8.#{J&h if(hCallWnd[index]==NULL)
iBd6&?E?< continue;
+7^p d9F. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
1J4Pnl+hN SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
1(Ta*"(0Ip }
:t{~Mi=T }
$KO2+^%y }
LWN{ return CallNextHookEx( hHook, nCode, wParam, lParam );
RI0^#S_{ }
B-R#?Xn:!I :Ko6.| BOOL InitHotkey()
^k;]"NR {
4
"HX1qP if(hHook!=NULL){
1!~cPD'F nHookCount++;
2t-w0~O return TRUE;
^,acU\}VqP }
\A"o[A2v else
by
X!, hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
B6Vlc{c5SO if(hHook!=NULL)
:^.wjUI nHookCount++;
hPDKxYD]f return (hHook!=NULL);
FM >ae-L- }
[d6! BOOL UnInit()
b}3"v( {
jC9us>b if(nHookCount>1){
yZ|"qP1 nHookCount--;
o@Oz
a return TRUE;
o)AwM" }
Ki\.w~Qs BOOL unhooked = UnhookWindowsHookEx(hHook);
8Ojqm#/f if(unhooked==TRUE){
_U<fS nHookCount=0;
/|1p7{km hHook=NULL;
/Vn>(;lo }
VThr]$2Y return unhooked;
Nr4:Gih }
w +t@G`d hfaU-IPcFX BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)U?_&LY)[M {
'4[=*!hs! BOOL bAdded=FALSE;
* x/!i^ for(int index=0;index<MAX_KEY;index++){
wZiUzS;v if(hCallWnd[index]==0){
^dHQ<L3.* hCallWnd[index]=hWnd;
N1c=cZDV HotKey[index]=cKey;
i2~uhGJ HotKeyMask[index]=cMask;
f"QiVJq bAdded=TRUE;
(+>
2&@@< KeyCount++;
[1VA`:?W break;
QPJ\Iu@D$ }
elOeXYO0 }
G%<}TI1} return bAdded;
`p\=NP!n }
N{;!xIv s[yWBew BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Wwq:\C {
jxh:z BOOL bRemoved=FALSE;
mgq!) for(int index=0;index<MAX_KEY;index++){
r]DiB:. if(hCallWnd[index]==hWnd){
<'a~ Y3B"o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
.f\LzZ-I: hCallWnd[index]=NULL;
XA>W>| HotKey[index]=0;
OSgJj MQ HotKeyMask[index]=0;
SS=<\q#MS bRemoved=TRUE;
/4:bx#;A KeyCount--;
{ mi}3/ break;
MtLWpi u@[ }
XO <wK }
Z*%;;&? }
m1"m KM return bRemoved;
8i# }
uJ!&T Ms{";qiG void VerifyWindow()
(vs<Fo|] {
*'<AwG& for(int i=0;i<MAX_KEY;i++){
M!UTqf7XL if(hCallWnd
!=NULL){ 2Je$SE8
if(!IsWindow(hCallWnd)){ RgJ@J/p"
hCallWnd=NULL; rbw$=bX}
HotKey=0; _4ag-'5
HotKeyMask=0; b_0THy.Z
KeyCount--; Xz+%Ym
} rhJ&* 0M
} e~o!Qm
} AjC:E+g
} :t}\%%EbmE
b\k]Jx
BOOL CHookApp::InitInstance() )pB#7aEw
{ P6:9o}K6
AFX_MANAGE_STATE(AfxGetStaticModuleState()); |Wh3a#
hins=AfxGetInstanceHandle(); TlqHj
InitHotkey(); f-ltV<C_
return CWinApp::InitInstance(); *c0H_8e
} XH%L]
\iuR+I
int CHookApp::ExitInstance() U<Pjn)M~B
{ 7aG.?Ca%
VerifyWindow(); "s2_X+4oY
UnInit(); tcD7OC:"6
return CWinApp::ExitInstance(); ;FPx
} Pf*6/7S:
b/SBQ"B%
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m5\T,
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) hnnB4]c
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ma YU%h0
#if _MSC_VER > 1000 `zd,^.i5~
#pragma once vCzZjGBY
#endif // _MSC_VER > 1000 *FS8]!Qg
`KJ(. m
class CCaptureDlg : public CDialog SQp|
{ [GwAm>k
// Construction -9Q(3$}
public: Lkt4F
BOOL bTray; LU1I
`E
BOOL bRegistered; h<9s&
p
BOOL RegisterHotkey(); IkrB}
UCHAR cKey; Y-VDi.]W
UCHAR cMask; ]z'&oz
void DeleteIcon(); =~D? K9o
void AddIcon(); iSW2I~PD
UINT nCount; Ss3p6%V/
void SaveBmp(); ^QK`z@B
CCaptureDlg(CWnd* pParent = NULL); // standard constructor twT/uBQ4a
// Dialog Data ?w3RqF@}
//{{AFX_DATA(CCaptureDlg) E$d#4x
enum { IDD = IDD_CAPTURE_DIALOG }; ~#-?V[
CComboBox m_Key; a)_3r]sv^
BOOL m_bControl; m4:c$5
BOOL m_bAlt;
~?ab_CY
BOOL m_bShift; ^7gGtz2
CString m_Path; zj
6I:Qr
CString m_Number; fPR_3qgQ
//}}AFX_DATA S|85g1}t
// ClassWizard generated virtual function overrides ]\E"oZ
//{{AFX_VIRTUAL(CCaptureDlg) LGP"S5V
public: r$7.
virtual BOOL PreTranslateMessage(MSG* pMsg); &D,Iwq
protected: d?,'$$ aB
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xc^@"
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); asWk]jjMG
//}}AFX_VIRTUAL "<,lqIqA;
// Implementation N5Js.j>z
protected: }:Z.g
HICON m_hIcon; M'*s5:i
// Generated message map functions *ap,r&]#F
//{{AFX_MSG(CCaptureDlg) (q)}`1d'
virtual BOOL OnInitDialog(); 7]=&Q4e4
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #'L<7t
K
afx_msg void OnPaint(); C @(@n!o:!
afx_msg HCURSOR OnQueryDragIcon(); Z
3BwbH
virtual void OnCancel(); z@*E=B1L
afx_msg void OnAbout(); Kv_2=]H
afx_msg void OnBrowse(); `Os=cMR
afx_msg void OnChange(); bI):-2&s}
//}}AFX_MSG qmS9*me
{
DECLARE_MESSAGE_MAP() i:lc]B
}; 0PzSp ]
#endif qu=~\t1[6
Jo? LPR
\6
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file VB |?S|<
#include "stdafx.h" p`tz*ewC
#include "Capture.h" %~rEJB@{
#include "CaptureDlg.h" 3CCs_AO
#include <windowsx.h> ah>c)1DA*H
#pragma comment(lib,"hook.lib") B#K gU&Loo
#ifdef _DEBUG v{u3[c
#define new DEBUG_NEW Z8v\>@?5R
#undef THIS_FILE c&['T+X
static char THIS_FILE[] = __FILE__; c_/BS n
#endif 5Rbl.5.A
#define IDM_SHELL WM_USER+1 FP@_V-
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N$fP\h^AR
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $BqiC!~
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (tK_(gO
class CAboutDlg : public CDialog sh/,"b2!P
{ |G j.E
public: _@5Xmr
CAboutDlg();
:1'
// Dialog Data L+t
/
E`
//{{AFX_DATA(CAboutDlg) ]U?nYppV
enum { IDD = IDD_ABOUTBOX }; r~b.tpH
//}}AFX_DATA m&)/>'W
// ClassWizard generated virtual function overrides qe]D4K8`Q3
//{{AFX_VIRTUAL(CAboutDlg) I?T
!
protected: {^]qaQ[5N
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 92TuuN#{
//}}AFX_VIRTUAL FFT)m^4p.
// Implementation x39tnf/F
protected: N,`@Q7
//{{AFX_MSG(CAboutDlg) Agcss20.
//}}AFX_MSG c`E>7Hjr-
DECLARE_MESSAGE_MAP() #MC#K{Xd
}; &;Ncc,jb
K,4Ig!
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z#{Y>.b
{ FZ*"^=)`G
//{{AFX_DATA_INIT(CAboutDlg) " ityx?
//}}AFX_DATA_INIT CD1Ma8I8
} R|?n
B`SX3,3
void CAboutDlg::DoDataExchange(CDataExchange* pDX) SSe;&Jk2d
{ +y|
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CDialog::DoDataExchange(pDX); +17!v_4^
//{{AFX_DATA_MAP(CAboutDlg) .Xlo-gHk
//}}AFX_DATA_MAP |nMjv]#
} 01(U)F\
[* xdILj
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7F`\Gz_2
//{{AFX_MSG_MAP(CAboutDlg) qlhc"}5x }
// No message handlers fTxd8an{
//}}AFX_MSG_MAP FB k7Cn!
END_MESSAGE_MAP() '4,?YcZ?S
`zoHgn7B9q
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c |0p'EQ
: CDialog(CCaptureDlg::IDD, pParent) kNuvJ/St
{ ^-%'ItVO
//{{AFX_DATA_INIT(CCaptureDlg) 8vx
ca]DcV
m_bControl = FALSE; "6,fIsU
m_bAlt = FALSE; \8(Je"S
m_bShift = FALSE;
1^_W[+<S/
m_Path = _T("c:\\"); !(*&P
m_Number = _T("0 picture captured."); =Jp:dM*
nCount=0; O%t? -h
bRegistered=FALSE; d=1\= d/K
bTray=FALSE; =svFw&q"
//}}AFX_DATA_INIT JMAdsg/
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R0t!y3r&N
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,e'r 0
} FQek+[ox
uc9h}QJ*
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9>{fsy
{ `;mgJD
CDialog::DoDataExchange(pDX); m%9Yo%l~
//{{AFX_DATA_MAP(CCaptureDlg) _DR@P(0>_
DDX_Control(pDX, IDC_KEY, m_Key); ^"Bhp:o2
DDX_Check(pDX, IDC_CONTROL, m_bControl); BOpZ8p'eH1
DDX_Check(pDX, IDC_ALT, m_bAlt); :ok.[q
DDX_Check(pDX, IDC_SHIFT, m_bShift); Y`gO:d8
DDX_Text(pDX, IDC_PATH, m_Path); Q8m~L1//S
DDX_Text(pDX, IDC_NUMBER, m_Number); %
jDH{xSMb
//}}AFX_DATA_MAP >{AE@@PB^
}
c@A.jc
hy/g*>
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6+=_p$crMx
//{{AFX_MSG_MAP(CCaptureDlg) !\ b-Ot(
ON_WM_SYSCOMMAND() p,=IL_
ON_WM_PAINT() kB+$Kt<]L
ON_WM_QUERYDRAGICON() o0WwlmB5
ON_BN_CLICKED(ID_ABOUT, OnAbout) ybpOk
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2UQF:R?LQ
ON_BN_CLICKED(ID_CHANGE, OnChange) Zx8$M5
//}}AFX_MSG_MAP OX,em Ti
END_MESSAGE_MAP() (ot,CpI(I
"%K'~"S#Q,
BOOL CCaptureDlg::OnInitDialog() H~*N:$C
{ F=5+JjrX
CDialog::OnInitDialog(); )]n>.ZmLCB
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); g Cp`J(2v:
ASSERT(IDM_ABOUTBOX < 0xF000);
kNP-+o
CMenu* pSysMenu = GetSystemMenu(FALSE); KXZG42w
if (pSysMenu != NULL) LYAGpcG
{ <hzHrx'o{
CString strAboutMenu; Cuylozj$&
strAboutMenu.LoadString(IDS_ABOUTBOX); Dx\~#$S!=
if (!strAboutMenu.IsEmpty()) "d}']M?-h
{ ,t_&tbf3
pSysMenu->AppendMenu(MF_SEPARATOR); tOXyle~C
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ew4D';&;
} 1GA.c:
} !- [ZQ
SetIcon(m_hIcon, TRUE); // Set big icon `;Ui6{|
SetIcon(m_hIcon, FALSE); // Set small icon '!$QI@@
m_Key.SetCurSel(0); uj;iE
9
RegisterHotkey(); rHk(@T.]
CMenu* pMenu=GetSystemMenu(FALSE); ~LI }
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e!=7VEB
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w#2apaz
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &%v*%{|j
return TRUE; // return TRUE unless you set the focus to a control sc t3|H#
} -Tvnd,
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void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) qo:Zc`t(R
{ {^
BZ#)m|
if ((nID & 0xFFF0) == IDM_ABOUTBOX) zEjl@Kf
{ ys!O"=OJ
CAboutDlg dlgAbout; Dhm;K$T
dlgAbout.DoModal(); 4~Q<LEly
}
p7+>]sqX
else !pfpT\i]N:
{ C!_=L?QT^
CDialog::OnSysCommand(nID, lParam); eG+$~\%Fub
} (]k Q9}8
} S#CaJ}M
^?|4<Rm
void CCaptureDlg::OnPaint() BgN^].z&
{ ;=2JbA+"G
if (IsIconic()) /?BTET
{ IUAe6
CPaintDC dc(this); // device context for painting !C4)P3k
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); };rEN`L
// Center icon in client rectangle gWro])3
int cxIcon = GetSystemMetrics(SM_CXICON); m,+E5^
int cyIcon = GetSystemMetrics(SM_CYICON); K}q5,P(
CRect rect; },<Y
\
GetClientRect(&rect); ZC$u8$+P
int x = (rect.Width() - cxIcon + 1) / 2; n[BYBg1yG
int y = (rect.Height() - cyIcon + 1) / 2; lB_4jc
// Draw the icon 5~>j98K
dc.DrawIcon(x, y, m_hIcon); Tb^1#O
} ?AO=)XV2
else >q')%j
{ fLRx{Nu
CDialog::OnPaint(); N)jNvzm
} 'xEomo#
} (7_ezWSl>
m[l&&(+J,
HCURSOR CCaptureDlg::OnQueryDragIcon() ao7M([ff
{ vh|m[ p
return (HCURSOR) m_hIcon; I 8
?
} j!L7r'AV5
/=V!lRs
void CCaptureDlg::OnCancel() \7UeV:3Ojn
{ q-1vtbn
if(bTray) ]}S9KP
DeleteIcon(); JFu.o8[Q
CDialog::OnCancel(); &~<i"
W
} +pUYFDwFx
lib^JJF
void CCaptureDlg::OnAbout() (w_b
{ dtQ3iuV %
CAboutDlg dlg; 'e>'JZR
dlg.DoModal(); $Q|6W &?[;
} F)l1%FCm
PTpfa*t
void CCaptureDlg::OnBrowse() "T8b.ng
{ V[8!ymi0
CString str; .K_50%s
BROWSEINFO bi; Y3V2}
char name[MAX_PATH]; dF|n)+C~R
ZeroMemory(&bi,sizeof(BROWSEINFO)); x wfdJ(&
bi.hwndOwner=GetSafeHwnd(); 9e;{o,r@
bi.pszDisplayName=name; O|v8.3[cT
bi.lpszTitle="Select folder"; t }K8{
V
bi.ulFlags=BIF_RETURNONLYFSDIRS; pNHL &H\
LPITEMIDLIST idl=SHBrowseForFolder(&bi); #VZ-gy4$\B
if(idl==NULL) .i7"qq.M
return; svCm}`
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EAs^i+/
str.ReleaseBuffer(); RR`\q>|
m_Path=str; 5n::]Q%=D
if(str.GetAt(str.GetLength()-1)!='\\') ju.`c->k"
m_Path+="\\"; x {Rj2~KC
UpdateData(FALSE); %~dn5t;
} qe uc^+P;
us#ji i.<
void CCaptureDlg::SaveBmp() |o_
N$70
{ -Lsl
CDC dc; 3D,tnn+J
dc.CreateDC("DISPLAY",NULL,NULL,NULL); YEiw!
CBitmap bm; Ch=jt*0
int Width=GetSystemMetrics(SM_CXSCREEN); +nYF9z2
int Height=GetSystemMetrics(SM_CYSCREEN); 3cH^
,F
bm.CreateCompatibleBitmap(&dc,Width,Height); 5uM`4xkj
CDC tdc; vQ5rhRG)E
tdc.CreateCompatibleDC(&dc); $ -]9/Ct
CBitmap*pOld=tdc.SelectObject(&bm); u\K`TWb%
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lo7>$`Q
tdc.SelectObject(pOld); ?+]
BITMAP btm; L$]Y$yv
bm.GetBitmap(&btm); w~AO;X*Ke"
DWORD size=btm.bmWidthBytes*btm.bmHeight; {FNCC*=
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); B.?@VF
BITMAPINFOHEADER bih; 4E$6&,\
bih.biBitCount=btm.bmBitsPixel; ?R@u'4yK
bih.biClrImportant=0; V4*/t#L/
bih.biClrUsed=0; bM,%+9oz;
bih.biCompression=0; Z%{`j!!p
bih.biHeight=btm.bmHeight; [Z[ p@Ux
bih.biPlanes=1; 2"Ki5
bih.biSize=sizeof(BITMAPINFOHEADER); LD;!
s
bih.biSizeImage=size; 7U)w\A;~
bih.biWidth=btm.bmWidth; fHF*#
bih.biXPelsPerMeter=0; u~'j?K.^
bih.biYPelsPerMeter=0; OV^?cA
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); tHJahK:"k
static int filecount=0; ;3=RM\
CString name; A2nL=9~
name.Format("pict%04d.bmp",filecount++); O2~Q(q'
name=m_Path+name; w\>@>*E>
BITMAPFILEHEADER bfh; T#YJ5Xw
bfh.bfReserved1=bfh.bfReserved2=0; F@xKL;'N74
bfh.bfType=((WORD)('M'<< 8)|'B'); |x ir93 |
bfh.bfSize=54+size; .UUT@
w?
bfh.bfOffBits=54; .A7ON1lc^C
CFile bf; \uOR1z
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _BND{MsX
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _y9NDLRs8
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); JPe<qf-
bf.WriteHuge(lpData,size); ,/-DAo~O
bf.Close(); Zu ![v0
nCount++; I5E4mv0<i
} E`q)vk
GlobalFreePtr(lpData); fTI~wF8!
if(nCount==1) &A&2z l %#
m_Number.Format("%d picture captured.",nCount); gGbJk&E
else pq,8z= Uf
m_Number.Format("%d pictures captured.",nCount); #@cEJV;5"
UpdateData(FALSE); zE=^}K+
} h(FFG%H(
Z"9D1Uk
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Oz5Ze/HBN
{ i7O8f^|
if(pMsg -> message == WM_KEYDOWN) Mir(
}E
{ <OGXKv@
if(pMsg -> wParam == VK_ESCAPE) XNkZ^3mq
return TRUE; .#Lu/w' -M
if(pMsg -> wParam == VK_RETURN) ]L!:/k,=S
return TRUE; vn.j>;E'
} 6P`!yBAu
return CDialog::PreTranslateMessage(pMsg); CuYSvW
} 9t{Iv({6p
ghaO#kI
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6M6r&,yRu
{ \x~},!l
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )VkH':yCM
SaveBmp(); bx3kd+J7
return FALSE; o+T, O+i
} g-2(W
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x3=SMN|a
CMenu pop; 7HQ|3rt
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 10..<v7
CMenu*pMenu=pop.GetSubMenu(0); oN.#q$\` k
pMenu->SetDefaultItem(ID_EXITICON); RA:3ZV
CPoint pt; e8hwXz
GetCursorPos(&pt); >^adxXw.o
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9y*pn|A[F
if(id==ID_EXITICON) cG4$)q;q
DeleteIcon(); wGx*Xy1n<
else if(id==ID_EXIT) q4KYC!b
OnCancel(); Z:<6Ck
return FALSE; NfXEW-
} 6F?U:N#<
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \aGTi
pB
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fTV3lyk
AddIcon(); T@on
ue7
return res; DZU} p
} @HP7$U"
$McbVn)~f
void CCaptureDlg::AddIcon() @<=<?T>1
{ 9Z. WR-}
NOTIFYICONDATA data; {GQRJ8m
data.cbSize=sizeof(NOTIFYICONDATA); %g=SkQ&d
CString tip; F44KbUH
tip.LoadString(IDS_ICONTIP); hdy
N
data.hIcon=GetIcon(0); -e_L2<7
data.hWnd=GetSafeHwnd(); E3 aj
strcpy(data.szTip,tip); m 3"|$0C~
data.uCallbackMessage=IDM_SHELL; ??? ;H
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +IbQVU~/
data.uID=98; ivP#qM1*;
Shell_NotifyIcon(NIM_ADD,&data); j#
!U6T
ShowWindow(SW_HIDE); oTxE]a,
bTray=TRUE; e'5sT#T9 l
} \t%rIr
m7.6;k.
void CCaptureDlg::DeleteIcon() hD>cxo
{ E9v_6d[
NOTIFYICONDATA data; F@kd[>/[
data.cbSize=sizeof(NOTIFYICONDATA); 7G
&I]>
data.hWnd=GetSafeHwnd(); Et+W LQ6)
data.uID=98; N&-J,p~
Shell_NotifyIcon(NIM_DELETE,&data); hBNA,e:
ShowWindow(SW_SHOW); }:4b_-&Q5
SetForegroundWindow(); ^n<o,K4\}
ShowWindow(SW_SHOWNORMAL); T8-,t];i
bTray=FALSE; TCetd#;R
} #'oGtFCd`
H 5'Ke+4.e
void CCaptureDlg::OnChange() "DU1k6XC
{ okQ<_1e{
RegisterHotkey(); DjveMs$d
} NVq3h\[X
xPorlX)zW
BOOL CCaptureDlg::RegisterHotkey() ynU20g
{ h5VZ-v_j
UpdateData(); #m36p+U
UCHAR mask=0; _jD\kg#LY
UCHAR key=0; gP:H_nVh
if(m_bControl) _/@u[dWeL
mask|=4; >m4Q*a4M
if(m_bAlt) zpBkP-%}E
mask|=2; %<[U\TL`
if(m_bShift) hYEUiQ
mask|=1; MtKM#@
key=Key_Table[m_Key.GetCurSel()]; /{*0
\`;
if(bRegistered){ XPsRa[08WK
DeleteHotkey(GetSafeHwnd(),cKey,cMask); $I:&5 o i
bRegistered=FALSE; Y>Tok|PV
} "=3bL>\<
cMask=mask; s>1Wjz2M
cKey=key; IH$ZPux
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qB8R4wCf
return bRegistered; dE]yb|Ld
}
k;xIo(:
K *xca(6
四、小结 Ue2%w/Yo
n(?BZ'&!O
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。