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:
%#@5(_'
C7_#D O6" 一、实现方法
8o!LgT5 "%K[kA6 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:
NSQ#\:3:S tQcn%CK #pragma data_seg("shareddata")
3/4r\%1b+ HHOOK hHook =NULL; //钩子句柄
4!DXj0^ UINT nHookCount =0; //挂接的程序数目
6_O3/ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
3zo:)N \K static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
!Q5NV4gd+ static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
n^%",*8gD* static int KeyCount =0;
_:VIlg
U static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
}vt>}%% #pragma data_seg()
YF<U'EVU- ~3qt<" 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。
br4 %(w(d T7j,%ay9 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:
?=%#lZ&? CG[04y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
T&s}~S=m cKey,UCHAR cMask)
P6u%-# {
rjL4t^rT BOOL bAdded=FALSE;
|M(0CYO for(int index=0;index<MAX_KEY;index++){
0v'!(&m if(hCallWnd[index]==0){
wZKEUJpQ hCallWnd[index]=hWnd;
8U7X/L
HotKey[index]=cKey;
qBqh>Wo HotKeyMask[index]=cMask;
gR@,"6b3 bAdded=TRUE;
?a'P;&@7 KeyCount++;
#]lK! : break;
]%I|C++0 }
t(=Z@9)]4F }
lIgAc!q( return bAdded;
7aJ:kumDZ }
[M&.'X //删除热键
Rge\8H/z BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`6 ?.ihV {
"i~~Q'=7 BOOL bRemoved=FALSE;
v_NL2eQ~ for(int index=0;index<MAX_KEY;index++){
#lO~n.+P if(hCallWnd[index]==hWnd){
) (l=_[1Z5 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
~?uch8H hCallWnd[index]=NULL;
qt4^e7o HotKey[index]=0;
0M|Jvw'n| HotKeyMask[index]=0;
C}(9SASs% bRemoved=TRUE;
_4~q&?}V KeyCount--;
dn:/8~B"X break;
3Tz~DdB }
D4\
*
,w }
Q(h/C!rKe }
M 3c return bRemoved;
9hdz<eFL }
|J^$3RX s!WI:E7 |!"qz$8fB DLL中的钩子函数如下:
@]X5g8h $gysy!2}. LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
H:.l:PJ {
MNd[Xzm BOOL bProcessed=FALSE;
~oE@y6Q if(HC_ACTION==nCode)
^4[|&E: {
8 ;o*c6+ if((lParam&0xc0000000)==0xc0000000){// 有键松开
l[M?"<Ot; switch(wParam)
Gey j`t {
sL\W6ej case VK_MENU:
fQ_(2+FM MaskBits&=~ALTBIT;
dIOiP\^ break;
kyu
PN<? case VK_CONTROL:
+z?SKc MaskBits&=~CTRLBIT;
H:_R[u4r break;
c,_??8 case VK_SHIFT:
GNab\M. MaskBits&=~SHIFTBIT;
fE,Io3 break;
0=V
-{ default: //judge the key and send message
-1c{Jo break;
<^fvTb &* }
sH /08Z for(int index=0;index<MAX_KEY;index++){
=w2_1F" if(hCallWnd[index]==NULL)
/'Q2TLy= continue;
ZCz#B2Sf8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
CCU<t
Q {
;eT+Ly|{ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Or,W2 bProcessed=TRUE;
>j_N6B! }
1 JB~G7 }
E 9v<VoNP` }
fe!{vrS else if((lParam&0xc000ffff)==1){ //有键按下
ayh=@7* switch(wParam)
vw[i.af {
D=:O^< case VK_MENU:
j/uu&\e MaskBits|=ALTBIT;
2^4OaHY88 break;
)l[bu6bM case VK_CONTROL:
Rxk0^d:sNi MaskBits|=CTRLBIT;
i;mA| break;
H?tX^HO:q case VK_SHIFT:
l{4rKqtX MaskBits|=SHIFTBIT;
)k6kK} break;
5:|=/X%#qp default: //judge the key and send message
RGy+W- break;
m\e?'-(s }
C5x*t Q| for(int index=0;index<MAX_KEY;index++){
7j8Ou3 if(hCallWnd[index]==NULL)
aYws{Vii continue;
@t4OpU<'*b if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
C9L_`[9DO {
!i5~>p|4@ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
MyaJhA6c bProcessed=TRUE;
V3c7F4\ }
yrQfPR }
s0*@zn>h }
eq,`T; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
O8)N`#1>+ for(int index=0;index<MAX_KEY;index++){
#9CLIYJAd if(hCallWnd[index]==NULL)
{W$K@vuV;? continue;
(fcJp)D if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
-)Of\4kx SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#VynADPs`o //lParam的意义可看MSDN中WM_KEYDOWN部分
/nB|Fo_&Q }
_BHEK }
^vha4<'-qG }
e]-%P(}Z return CallNextHookEx( hHook, nCode, wParam, lParam );
oUx%ra{ }
0Ait7` M*2
Nq=3 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:
(Fs{~4T MZ"|Jn BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
s"B+),Jod BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)%vnl~i! #dDM
"s 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:
ch]{=61 jH?!\F2)+ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
E D^0t {
aDda&RM if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
uS7kkzt-x {
_(F8}s //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
oMHTB!A=2 SaveBmp();
6QAhVg: A return FALSE;
{3!E8~ }
t[o_!fmxZ …… //其它处理及默认处理
a6!|#rt }
t4Pi <m:7 D`3`5.b FA!!S`{\ 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。
()e|BFL . RAj>{/E#W 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。
h]pz12Yf
{[dY$
二、编程步骤
AL;4-(KH %uDH_J|^ 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";
"NtY[sT{V R*DQLBWc 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
7>
8L%(7 58P[EMhL 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;
il% u)NN |H.ARLS 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;
bXk(wXX Dvm[W),(k 5、 添加代码,编译运行程序。
|dhKeg_ :f~qt%%/ 三、程序代码
}/2M?W0 (9Q@I8}Iy ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
%"^8$A?>,k #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
e%C_> #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
$[\\{XJ. #if _MSC_VER > 1000
iTVZo?lVo #pragma once
T{)_vQ #endif // _MSC_VER > 1000
v?_L_{x;W #ifndef __AFXWIN_H__
(D0\uld9 #error include 'stdafx.h' before including this file for PCH
&yG5w4< #endif
^09-SUl^ #include "resource.h" // main symbols
Q2[;H!" class CHookApp : public CWinApp
yt<h!k$ _P {
+`tk LvM public:
Q)im2o@z CHookApp();
p0hE`! // Overrides
bE?X?[K // ClassWizard generated virtual function overrides
=YY 7V! //{{AFX_VIRTUAL(CHookApp)
-\n%K public:
%`*On~ virtual BOOL InitInstance();
quRTA"!E virtual int ExitInstance();
H*Tzw,f~ v //}}AFX_VIRTUAL
nF$HWp> //{{AFX_MSG(CHookApp)
:0Z\-7iK // NOTE - the ClassWizard will add and remove member functions here.
ih-J{1 // DO NOT EDIT what you see in these blocks of generated code !
jl5&T{z //}}AFX_MSG
)Z)Gb~G DECLARE_MESSAGE_MAP()
LGK@taw^ };
_!,Ees=b LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
^h^.;Iqr= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
in6*3C4 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
(eSsx/ BOOL InitHotkey();
")<5VtV BOOL UnInit();
/36gf #endif
%j.n^7i]^: inh
J|pe" //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
GSW%~9WBa #include "stdafx.h"
pQ>|dH+. #include "hook.h"
OX%#8Lx #include <windowsx.h>
U7Oa
13Qz #ifdef _DEBUG
2T(7V[C%9 #define new DEBUG_NEW
fbD,\ rjT #undef THIS_FILE
cQ
|Q-S static char THIS_FILE[] = __FILE__;
y%?'<j #endif
b!bg sd #define MAX_KEY 100
voQJ!h1 #define CTRLBIT 0x04
E^A S65%bL #define ALTBIT 0x02
PQp/&D4K #define SHIFTBIT 0x01
0TZB}c#qT #pragma data_seg("shareddata")
sUU[QP- HHOOK hHook =NULL;
.N( X.C UINT nHookCount =0;
`]^W#6l static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"By$!R-& static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
> l]Ble static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
Ft?eqDS1 static int KeyCount =0;
V>/,&~0 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
vn!5@""T #pragma data_seg()
[>t;P, HINSTANCE hins;
]|tR8`DGZ% void VerifyWindow();
+abb[ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
$JUkwsc //{{AFX_MSG_MAP(CHookApp)
ja9=b?]0, // NOTE - the ClassWizard will add and remove mapping macros here.
S`$%C=a. // DO NOT EDIT what you see in these blocks of generated code!
x-]:g&5T //}}AFX_MSG_MAP
t+_\^Oa) END_MESSAGE_MAP()
<ZheWl hz*T"HJ]t CHookApp::CHookApp()
QO^V@"N {
L^*f$Balz // TODO: add construction code here,
Bal e_s^ // Place all significant initialization in InitInstance
3!$+N\ #w }
=fJU+N+< &,yF{9$G CHookApp theApp;
C+g}+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
~(8f Uob {
>lKu[nq; BOOL bProcessed=FALSE;
d%. |MAE if(HC_ACTION==nCode)
E- [Eg {
V:>r6 if((lParam&0xc0000000)==0xc0000000){// Key up
0N~kq-6.\ switch(wParam)
?|98Y"w {
ul#y'iY] case VK_MENU:
+80bG(I_ MaskBits&=~ALTBIT;
P;o{t break;
JsNj!aeU% case VK_CONTROL:
qS9<_if2 MaskBits&=~CTRLBIT;
D'vaK89\ break;
7B=VH r case VK_SHIFT:
zjh:jrv~ MaskBits&=~SHIFTBIT;
WMC\J(@. break;
T0Xm}i default: //judge the key and send message
;i\N!T{> break;
/(*Ucv2i}T }
GcDA0%i for(int index=0;index<MAX_KEY;index++){
L9N}lH if(hCallWnd[index]==NULL)
n}_}#(a continue;
2Z%n
"z68 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-gm5Eqi {
qdn_ZE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
YoW)]n bProcessed=TRUE;
URs]S~tk }
ox%j_P9@: }
AH :uG# }
e4,SR(O> else if((lParam&0xc000ffff)==1){ //Key down
f;Oh"Yt switch(wParam)
"[!b5f3!I {
'tY(&& case VK_MENU:
+<.o,3 MaskBits|=ALTBIT;
LRts
W(A/ break;
!^&VZh case VK_CONTROL:
9:Oz-b MaskBits|=CTRLBIT;
oKsArZG break;
?&-1(& case VK_SHIFT:
2|=hF9
MaskBits|=SHIFTBIT;
3qn_9f ] break;
B}[f]8jrM default: //judge the key and send message
0&j90J$` break;
0FtwDM)) }
zWhj>Za for(int index=0;index<MAX_KEY;index++)
YLi6GY {
/AADFa if(hCallWnd[index]==NULL)
8QK8q:| continue;
]"b:IWPeI if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!p).3Kx0 {
D\b$$z]q SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
'/NpmNY:L bProcessed=TRUE;
w2UEU5% }
*U,JQ }
NS2vA>n8R }
vQyY
% if(!bProcessed){
Vx2/^MiXy for(int index=0;index<MAX_KEY;index++){
Yi?bY if(hCallWnd[index]==NULL)
@;` 's continue;
+/Y2\s if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
S'8+jY SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+^+'.xQ }
\c4jGJ }
Q5T3 }
d\nXK#)Q return CallNextHookEx( hHook, nCode, wParam, lParam );
vRe X7 }
`DF49YP"~ T>'O[=UWh BOOL InitHotkey()
lUB?eQuN_ {
m9A%Z bQ^ if(hHook!=NULL){
5RN!"YLI3 nHookCount++;
mf$YsvPq*+ return TRUE;
YB7n}r23 }
c>K]$;} else
OQ hQ!6 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
T2S_>
#."l if(hHook!=NULL)
PXYLLX\3 nHookCount++;
'z5jnI return (hHook!=NULL);
pT->qQ3; }
=~h b& BOOL UnInit()
}n4 T!N {
lbda/Zx if(nHookCount>1){
UjQz nHookCount--;
_\X ,a5Un return TRUE;
j=irx5: }
i,r:R
g~ BOOL unhooked = UnhookWindowsHookEx(hHook);
17Cb{Q if(unhooked==TRUE){
uAeo&|& nHookCount=0;
e
O\72? K hHook=NULL;
fV|uKs(W }
6!"wiM"] return unhooked;
,{HQKHg }
k3qQU) vvv'!\'# BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
v,ZYh w {
N'VTdf? BOOL bAdded=FALSE;
?-<lIFFh for(int index=0;index<MAX_KEY;index++){
__'4Qt if(hCallWnd[index]==0){
uL^; i"" hCallWnd[index]=hWnd;
rZ `1G HotKey[index]=cKey;
ih".y3 HotKeyMask[index]=cMask;
^#<L!yo^ bAdded=TRUE;
{\D&* KeyCount++;
KJ'ID break;
mG\QF0h }
'G l~P><e }
z1Bi#/i return bAdded;
\L(cFjLIl }
|qn2b= C7ivAh BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]5"k%v| {
t<Yi!6 BOOL bRemoved=FALSE;
"jum*<QZz for(int index=0;index<MAX_KEY;index++){
PiKP. if(hCallWnd[index]==hWnd){
o@zxzZWg if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
:TU|:2+ hCallWnd[index]=NULL;
aNEah HotKey[index]=0;
z qq HotKeyMask[index]=0;
VQHB}Y@^ bRemoved=TRUE;
\uOM,98xS KeyCount--;
'_G\_h}5 break;
q k^FyZ< }
I;t@wbY, }
|ZH(Z}m }
'-%1ILK$3r return bRemoved;
.@,t}:lD }
d#0:U
Y% ~ z9ADF(J?0' void VerifyWindow()
dR]-R/1| {
kP%hgZ for(int i=0;i<MAX_KEY;i++){
UA8hYWRP if(hCallWnd
!=NULL){ losqc *|
if(!IsWindow(hCallWnd)){ [
@eA o>
hCallWnd=NULL; pz
/[${X
HotKey=0; 7?=^0?a
HotKeyMask=0; XG.[C>
KeyCount--; V+"%BrM
} '%rT]u3U
} p3U)J&]c6
} Rsfb?${0G
} M9W
zsWM
r&E gP
BOOL CHookApp::InitInstance() =%7drBo D
{ MT&aH~YB
AFX_MANAGE_STATE(AfxGetStaticModuleState()); |X8?B=
hins=AfxGetInstanceHandle(); k)n
b<JW|r
InitHotkey(); 6#+&/ "*
return CWinApp::InitInstance(); 9Y,JYc#
} ~JXz
2xLtJR4L
int CHookApp::ExitInstance() 1X2j%qI&
{ U9:)qvMXe
VerifyWindow(); 4[$:KGh3
UnInit(); _U^[h !
return CWinApp::ExitInstance(); ~9+01UU^
} d^}p#7mB\
tS2&S 6u
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file (kLaXayn
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @-)?uYw:r
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^y/Es2A#t
#if _MSC_VER > 1000 {1Ra|,;
#pragma once (+|+ELfqW
#endif // _MSC_VER > 1000 5I2,za&e
src9EeiV
class CCaptureDlg : public CDialog oFU:]+.+D
{ 27D*FItc
// Construction g3$'Ghf
public: !{jw!bB
BOOL bTray; ez'NHodwk2
BOOL bRegistered; 4{uQ}ea
BOOL RegisterHotkey(); d&NnpjH}c
UCHAR cKey; epiviCYC
UCHAR cMask; B"&-) (
void DeleteIcon(); :8)Jnh\5
void AddIcon(); 'v]0;~\mp>
UINT nCount; $NVVurXa
void SaveBmp(); YcobK#c
CCaptureDlg(CWnd* pParent = NULL); // standard constructor t<8)h8eW
// Dialog Data MIZdk'.U
//{{AFX_DATA(CCaptureDlg) G]ek-[-
enum { IDD = IDD_CAPTURE_DIALOG }; j?N<40z
CComboBox m_Key; Mr)t>4
BOOL m_bControl; h =A
BOOL m_bAlt; ?y-^Fq|h
BOOL m_bShift; TGF$zvd
CString m_Path; [K3
te
CString m_Number; e v$:7}h=
//}}AFX_DATA F\DiT|?}
// ClassWizard generated virtual function overrides dun`/QKV
//{{AFX_VIRTUAL(CCaptureDlg) U*C^g}iA
public: d0 )725Ia
virtual BOOL PreTranslateMessage(MSG* pMsg);
zIrOMh
protected: nc;eNB
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C1D:Xi-
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); y47N(;vy
//}}AFX_VIRTUAL \V$qAfP)
// Implementation _Xd"'cXw
protected: \}jA1oy
HICON m_hIcon; 3*h"B$g!
// Generated message map functions lJdBUoO
//{{AFX_MSG(CCaptureDlg) DPT6]pl"y
virtual BOOL OnInitDialog(); sjyr9AF
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); K KB+o)*W
afx_msg void OnPaint(); 6MVu"0#
afx_msg HCURSOR OnQueryDragIcon(); vS8&,wJ!
virtual void OnCancel(); 7% D 4
afx_msg void OnAbout(); r E m/Q!
afx_msg void OnBrowse(); oy8jc];SO
afx_msg void OnChange(); OE@[a
//}}AFX_MSG Q7aPW\-
DECLARE_MESSAGE_MAP() Jo {:]:
}; r'*$'QY-N
#endif ?/o 8f7Z
w,p'$WC*
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FLW VI4*
#include "stdafx.h" gQPw+0w
#include "Capture.h" E]mm^i`|
#include "CaptureDlg.h" 9-pt}U
#include <windowsx.h> %aNm j)L
#pragma comment(lib,"hook.lib") <Z%=lwtX
#ifdef _DEBUG ,\6Vb*G|E>
#define new DEBUG_NEW 712nD ?>
#undef THIS_FILE G`FYEmD
static char THIS_FILE[] = __FILE__; (mIjG)4t
#endif p]mN)
#define IDM_SHELL WM_USER+1 {mJ'
Lb0;
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r:bJU1P1$s
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qofAA!3z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; EHC7b^|3}
class CAboutDlg : public CDialog 6B?jc/V.R
{
N9!L8BBaK
public: VM%g QOo<
CAboutDlg(); t+U.4mS-
// Dialog Data KZ%i&w#<
//{{AFX_DATA(CAboutDlg) |]9@JdmV
enum { IDD = IDD_ABOUTBOX }; r?/Uu
&
//}}AFX_DATA { U;yW)
// ClassWizard generated virtual function overrides x-[ItJ% l
//{{AFX_VIRTUAL(CAboutDlg) hS,&Nj+
protected: xF[%R{Mn'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mXz*Gi
//}}AFX_VIRTUAL `6~0W5
// Implementation :K6JrS
protected: *a Z1 4
//{{AFX_MSG(CAboutDlg) 76 !LMNf
//}}AFX_MSG :i<*~0r<
DECLARE_MESSAGE_MAP() zP,r,ok7
}; 4k225~GQ:C
D./{f8
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E]'
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{ (u &x.J
//{{AFX_DATA_INIT(CAboutDlg) Or? )Nlg6x
//}}AFX_DATA_INIT 7FE36Ub9
} ;dzL9P9IU
KUJ Lx
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R,BJr y
{ Z[nHo'
CDialog::DoDataExchange(pDX); (,h2qP-;ud
//{{AFX_DATA_MAP(CAboutDlg) b=5w>*
//}}AFX_DATA_MAP 3Z?ornS
} dx@dnWRT,
G!Brt&_'
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3Q$4`p;
//{{AFX_MSG_MAP(CAboutDlg) ;5ki$)v"
// No message handlers |*c1S
-#
//}}AFX_MSG_MAP Tdcc<T
END_MESSAGE_MAP() gML8lu0)
gxl7jY
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $E@n;0P
: CDialog(CCaptureDlg::IDD, pParent) &x1A{j_
{ Lng. X8D
//{{AFX_DATA_INIT(CCaptureDlg) GNJ/|9
m_bControl = FALSE; M 2hZ'
m_bAlt = FALSE; un 5r9
m_bShift = FALSE; A`uHZCwJ5
m_Path = _T("c:\\"); r
&.~
{
m_Number = _T("0 picture captured."); T_S3_-|{==
nCount=0; v*!N}1+J
bRegistered=FALSE; F-s{#V1=
bTray=FALSE; y$%oR6K7-
//}}AFX_DATA_INIT %C/p+Tg
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #%[;vK
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); on7
n4
} v":q_w<k
:6Nb,Hh~
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1%v6d
!
{ |<u+Xi
~
CDialog::DoDataExchange(pDX); cA Nt7
//{{AFX_DATA_MAP(CCaptureDlg) RvAgv[8
DDX_Control(pDX, IDC_KEY, m_Key); or*{P=m+R
DDX_Check(pDX, IDC_CONTROL, m_bControl); gHPJiiCv
DDX_Check(pDX, IDC_ALT, m_bAlt); @mCe{r*`
DDX_Check(pDX, IDC_SHIFT, m_bShift); 4;AF\De
DDX_Text(pDX, IDC_PATH, m_Path); $bG*f*w
DDX_Text(pDX, IDC_NUMBER, m_Number); Br!;Ac&N
//}}AFX_DATA_MAP d}Pfj=W
} ><}nZ7
7Vy_Cec1
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) u1 Q;M`+>
//{{AFX_MSG_MAP(CCaptureDlg) x[58C +
ON_WM_SYSCOMMAND() nz3*s#k\-
ON_WM_PAINT() ~s+vJvWz
ON_WM_QUERYDRAGICON() )7 & -DI1
ON_BN_CLICKED(ID_ABOUT, OnAbout) v^ ^Ibv
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) bW=q G
ON_BN_CLICKED(ID_CHANGE, OnChange) i9L]h69r
//}}AFX_MSG_MAP 4z(~)#'^
END_MESSAGE_MAP() b1?^9c#0d
?(gha
BOOL CCaptureDlg::OnInitDialog() g)#?$OhP"
{ dM;\)jm
CDialog::OnInitDialog(); oE+P=
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); AAQ!8!
ASSERT(IDM_ABOUTBOX < 0xF000); ee?
d?:L
CMenu* pSysMenu = GetSystemMenu(FALSE); >8"(go+02
if (pSysMenu != NULL) FygNWI '
{ >pp/4Ia!
CString strAboutMenu; ycBgr,Ynu<
strAboutMenu.LoadString(IDS_ABOUTBOX); 3JGrJ!x
if (!strAboutMenu.IsEmpty()) D\_nqx9O
{ v;\cM/&5
pSysMenu->AppendMenu(MF_SEPARATOR); BI?, 3
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G[ U5R?/
} $l*?Ce:
} )8C`EPe
SetIcon(m_hIcon, TRUE); // Set big icon HTYyX(ya
SetIcon(m_hIcon, FALSE); // Set small icon X|a{Z*y;r*
m_Key.SetCurSel(0); q~}oU5
RegisterHotkey(); Tv"T+!Z
CMenu* pMenu=GetSystemMenu(FALSE); UDI\o1Rbp
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .T3N"}7[
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )vO"S
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5@xR`g-
return TRUE; // return TRUE unless you set the focus to a control
oT\K P
} Ga5s9wC
#ELeW3
S}
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b\0>uU
{ B2kZ_4rB
if ((nID & 0xFFF0) == IDM_ABOUTBOX) fx|d"VF[
{ t}k:wzZ@
CAboutDlg dlgAbout; mI7lv;oN<5
dlgAbout.DoModal(); 6]iU-k0b
} W+a/>U
else #HgNwM
{ "Vq=
Ph
CDialog::OnSysCommand(nID, lParam); UE^o}Eyg
} C_N|o|dX
} Z
01A~_
)IcSdS0@M
void CCaptureDlg::OnPaint() 5! );4+
{ D=^&?@k<
if (IsIconic()) *1EmK.-'u
{ F9eEQ{L
CPaintDC dc(this); // device context for painting 4"@;.C""
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?7NSp2aq2A
// Center icon in client rectangle UK,bfLPt~
int cxIcon = GetSystemMetrics(SM_CXICON); ?L0;,
\-t
int cyIcon = GetSystemMetrics(SM_CYICON); -u@ ^P7
CRect rect; , mz;$z6i
GetClientRect(&rect); }OEL] 5
int x = (rect.Width() - cxIcon + 1) / 2; i!2k f
int y = (rect.Height() - cyIcon + 1) / 2; |aLK_]!
// Draw the icon ow \EL
dc.DrawIcon(x, y, m_hIcon); a"-uJn
} `"65 _?B i
else ^"7-`<J
{ 8p 4[:M@
CDialog::OnPaint(); 1*p6UR&
} =
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} >fYcr#i0[
$\ZWQct
HCURSOR CCaptureDlg::OnQueryDragIcon() fJ8>nOh
{ Q`*U U82!
return (HCURSOR) m_hIcon; <5G(Y#s/?
} )f$4:Pq
L6CI9C;-b
void CCaptureDlg::OnCancel() bIGcszWr
{ -m}'I8
if(bTray) [RKk-8I
DeleteIcon(); ufk2zL8y
CDialog::OnCancel(); (qFZF7(Xa
} Lan|(!aW
t)j$lmQn
void CCaptureDlg::OnAbout() P-B5-Nz
{ n>pJ/l%`
CAboutDlg dlg; E@C.}37R
dlg.DoModal(); 02Vfg42
} a2.6S./
LC]0c)v#
void CCaptureDlg::OnBrowse() ?Ojv<L-f.:
{ G%HG6
CString str; 9_wDh0b~p
BROWSEINFO bi; )!0}<_2
char name[MAX_PATH]; I;rW!Hb
ZeroMemory(&bi,sizeof(BROWSEINFO)); K W&muD
bi.hwndOwner=GetSafeHwnd(); 8TpYt)]S
bi.pszDisplayName=name; ((`\i=-o5
bi.lpszTitle="Select folder"; )&T 5/+
bi.ulFlags=BIF_RETURNONLYFSDIRS; FDgo6x
LPITEMIDLIST idl=SHBrowseForFolder(&bi); t#(=$
if(idl==NULL) |kh{EUE
;
return; >N al\
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); _yAY5TIv
str.ReleaseBuffer(); T/ ECW
m_Path=str; HTQTDbhV^
if(str.GetAt(str.GetLength()-1)!='\\') zlP{1z;nV
m_Path+="\\"; _LZ(HTX~
UpdateData(FALSE); gd
* b0(
} lZRO"[<
3U^Vz9LW
void CCaptureDlg::SaveBmp() j~Pwt9G
{ lha;|
CDC dc; &iWTf K7
dc.CreateDC("DISPLAY",NULL,NULL,NULL); FbuWFC
CBitmap bm; <5%*"v
int Width=GetSystemMetrics(SM_CXSCREEN); 0V-jOc
int Height=GetSystemMetrics(SM_CYSCREEN); odca?
bm.CreateCompatibleBitmap(&dc,Width,Height); Ud+,/pE>FA
CDC tdc; /1Gmga5
tdc.CreateCompatibleDC(&dc); #W8F_/!n|
CBitmap*pOld=tdc.SelectObject(&bm); oH17!$Fly
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2p9^ =
tdc.SelectObject(pOld); Y7+c/co
BITMAP btm; .f0qgmIyL
bm.GetBitmap(&btm); hpXW tQ
DWORD size=btm.bmWidthBytes*btm.bmHeight; 9IXy96]]6
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8nBYP+t,e
BITMAPINFOHEADER bih; #Hr'plg
8
bih.biBitCount=btm.bmBitsPixel; s:lH4B
bih.biClrImportant=0; y@v)kN)Y9\
bih.biClrUsed=0; {HY3E}YJL
bih.biCompression=0; <ot`0
bih.biHeight=btm.bmHeight; [*O>Lk
bih.biPlanes=1; muXP5MO
bih.biSize=sizeof(BITMAPINFOHEADER); Es#:0KH].v
bih.biSizeImage=size; '^m'r+B"
bih.biWidth=btm.bmWidth; oU,8?(}'~
bih.biXPelsPerMeter=0; 5uG^`H@X
bih.biYPelsPerMeter=0; NsYEBT7f
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {Zv%DV4_$
static int filecount=0; ]8wm1_qV
CString name; PeIi@0vA
name.Format("pict%04d.bmp",filecount++); s@&3;{F6D
name=m_Path+name; VDOC>
BITMAPFILEHEADER bfh; }Ifa5Lq)
bfh.bfReserved1=bfh.bfReserved2=0; p>pN?53S
bfh.bfType=((WORD)('M'<< 8)|'B'); '*XIp:
bfh.bfSize=54+size; I}u\ov_Su
bfh.bfOffBits=54; 0`.&U^dG
CFile bf; |WS@q'
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ i 1w]j
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); evZP*N~G
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p #w8$Qjp
bf.WriteHuge(lpData,size); Hd;NvNS
bf.Close(); h-Y>>l>PW0
nCount++; {hN\=_6*EW
} m4h)Wq
GlobalFreePtr(lpData); An#[
+?
if(nCount==1) Y?1T
XsvF
m_Number.Format("%d picture captured.",nCount); ZzBaYoNy[0
else
Y*pXbztP
m_Number.Format("%d pictures captured.",nCount); V?*fl^f
UpdateData(FALSE); v+x rnz
} h
#gI1(uL
nLAwo3
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) du}HTrsC
{ hd9~Zw]V
if(pMsg -> message == WM_KEYDOWN) Has}oe[
{ ^L.I9a#]
if(pMsg -> wParam == VK_ESCAPE) 2HVqJib4Yn
return TRUE; hj"JmF$m
if(pMsg -> wParam == VK_RETURN) KM)MUPr
return TRUE; tk-)N+M.
} GIYdI#0RC
return CDialog::PreTranslateMessage(pMsg); !wE% <Fh
} 5l@}1n
[u*7( 4e
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :j3^p8]
{ J
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if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R`$jF\"`r
SaveBmp(); "qC3%9e
return FALSE; %4rlB$x
} xe6V7Wi/Tt
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ yn+m,K/
CMenu pop; xcl;~"c*
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6(?@B^S>2
CMenu*pMenu=pop.GetSubMenu(0); ^F?B_'
pMenu->SetDefaultItem(ID_EXITICON); s\3]0n9
CPoint pt; /|NyO+Io
GetCursorPos(&pt); c99|+i50
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gO*Gf2AG
if(id==ID_EXITICON) 0=7Ud<
DeleteIcon(); _&q&ID
else if(id==ID_EXIT) Y
?~n6<
OnCancel(); r9(c<E?,h
return FALSE; ER-Xd9R
}
":T"Y;
LRESULT res= CDialog::WindowProc(message, wParam, lParam); MY\mo,#
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) aBQ --Sz
AddIcon(); G+sB/l"
return res; ~7j-OWz9
} o6 NmDv5
N1g;e?T':
void CCaptureDlg::AddIcon() k}kwr[
{ PDc4ok`)
NOTIFYICONDATA data; $=>:pQbBVX
data.cbSize=sizeof(NOTIFYICONDATA); (/&ht-~EL
CString tip; Q ijO%)
tip.LoadString(IDS_ICONTIP); E{-pkqx
data.hIcon=GetIcon(0); f]2gjQHM
data.hWnd=GetSafeHwnd(); -$%~EY}
strcpy(data.szTip,tip); 9\Rk(dd
data.uCallbackMessage=IDM_SHELL; wrCV&2CG
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <MO40MP
data.uID=98; ;>>:7rdYt
Shell_NotifyIcon(NIM_ADD,&data); H.n|zGQTB
ShowWindow(SW_HIDE); GRL42xp'*D
bTray=TRUE; /;Cx|\
} ZA_~o#0%
c\P}ZQ
void CCaptureDlg::DeleteIcon() *2pE39
{ 4;Hm%20g
NOTIFYICONDATA data; h\)ual_r[j
data.cbSize=sizeof(NOTIFYICONDATA); 4K;0.W;~|
data.hWnd=GetSafeHwnd(); |C+
5
data.uID=98; MD1d
Shell_NotifyIcon(NIM_DELETE,&data); <;+QK=f
ShowWindow(SW_SHOW); Lrx"Hn{
SetForegroundWindow(); RM2feWm
ShowWindow(SW_SHOWNORMAL); 3!*`hQ;s
bTray=FALSE; zhRF>Y`
} EG=U](8T
},5LrX`L
void CCaptureDlg::OnChange() [A!=Hv_$
{ H lFVc
RegisterHotkey(); {![E)~
} bDw\;bnG
|QH )A
BOOL CCaptureDlg::RegisterHotkey() z} VCiS0
{ MS|1Q@S9
UpdateData(); { iLr$89
UCHAR mask=0; RKs_k`N0
UCHAR key=0; .$G^c
if(m_bControl) 0j#$Swa
mask|=4; L<<v
if(m_bAlt) 'HvW&~i(
mask|=2; HwMe^e;
if(m_bShift) |])Ko08*tE
mask|=1; 7V\M)r{q7
key=Key_Table[m_Key.GetCurSel()]; r_a1oO:
if(bRegistered){ \gZjq]3
DeleteHotkey(GetSafeHwnd(),cKey,cMask); +(q
r {G?
bRegistered=FALSE; ,qgR+]?({
} 7BA9zs392
cMask=mask; h7]>b'H
cKey=key; 5FNf)F
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); k|_
>I
return bRegistered; cz>`$Zz
} "Jyb?5
7.^1I7O
四、小结 t&bE/i_T
.|kp`-F51
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。