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:
3_ bE12 SFu]*II;{ 一、实现方法
FR9w0{o
HNJR&U t 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:
gmUXh;aHc ?rm3Iac0S #pragma data_seg("shareddata")
NX[-Y]t HHOOK hHook =NULL; //钩子句柄
tJG+k)EE UINT nHookCount =0; //挂接的程序数目
HLe/|x\@< static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
&\>=4)HB; static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}/w]+f* static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
m?<^b_a} static int KeyCount =0;
~8 B] static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
f+cN'jH
E #pragma data_seg()
3"BSP3/[l LR "=( 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。
ZZ>"LH `@q\R-` 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:
oF0DprP@ U{\9mt7b! BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
["O_Phb| cKey,UCHAR cMask)
ZveNe~D7C {
`q9n`h1 BOOL bAdded=FALSE;
eMV{rFmT for(int index=0;index<MAX_KEY;index++){
k vpkWD; if(hCallWnd[index]==0){
ZaBmH|k hCallWnd[index]=hWnd;
)x,/+R]{8l HotKey[index]=cKey;
2tb+3K1 HotKeyMask[index]=cMask;
u`.3\Geh bAdded=TRUE;
4se6+oJe KeyCount++;
SK5_^4 break;
3'Hz,qP }
ZEp>~dn; }
KE4#vKV0yC return bAdded;
qyBC1an5, }
~.tl7wKkR/ //删除热键
^e]O-,UBk BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
csd9[=HW/Q {
eZoAy[ BOOL bRemoved=FALSE;
<NEz{ 1Z for(int index=0;index<MAX_KEY;index++){
=@nE:uto] if(hCallWnd[index]==hWnd){
k:&vW21E if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
yq?\.~ax hCallWnd[index]=NULL;
?I8r2M] HotKey[index]=0;
.=)[S5.BVq HotKeyMask[index]=0;
~,_@|,) bRemoved=TRUE;
BbM/Rd1tAm KeyCount--;
1V wcJd break;
AdpJ4}|0 }
gg/ts]$ }
YQ@2p?4m }
p"FWAC! return bRemoved;
EKD#s,(V*X }
v, CWE [_KV;qS%/ S
n<X DLL中的钩子函数如下:
B^!-%_q -e_|^T" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
QE8`nMf {
.l hS BOOL bProcessed=FALSE;
,1g_{dMx if(HC_ACTION==nCode)
?@z/#3b {
aX~Jk >a0 if((lParam&0xc0000000)==0xc0000000){// 有键松开
V.9p4k` switch(wParam)
7|o!v);uR {
lUaJC'~p case VK_MENU:
33SCHQ MaskBits&=~ALTBIT;
cV"Ov@_.k break;
3GNcnb case VK_CONTROL:
z9:yt5ar MaskBits&=~CTRLBIT;
jXVvVv break;
H+562W case VK_SHIFT:
#sg*GK+|:R MaskBits&=~SHIFTBIT;
Yi]`"\ break;
kS35X)- default: //judge the key and send message
j7^A%9 break;
t-5K
dLB }
!g`I*ZE+e for(int index=0;index<MAX_KEY;index++){
w=CzPNRHH! if(hCallWnd[index]==NULL)
p>O/H1US; continue;
qDTdYf if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
n|pdYe8\ {
*T#^|<.XG SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&qK:LHhj bProcessed=TRUE;
:
h(Z\D_ }
F\hVunPVx }
6yBd9= 3K }
c3Gy1#f:#2 else if((lParam&0xc000ffff)==1){ //有键按下
pH2/."zE< switch(wParam)
D)bL;h {
xFekSH7[F case VK_MENU:
6O/c%1VHA3 MaskBits|=ALTBIT;
L+VQtp&" break;
SuB8mPn case VK_CONTROL:
"G-h8IN^O MaskBits|=CTRLBIT;
kxN
O9w break;
Ozhn`9L+1! case VK_SHIFT:
98)C
7N' MaskBits|=SHIFTBIT;
xmEom break;
?:M4GY"gV default: //judge the key and send message
AAs&P+;
break;
zRa2iCi }
ar\K8mj for(int index=0;index<MAX_KEY;index++){
*7-rm if(hCallWnd[index]==NULL)
@e& 0Wk continue;
}zS5o
[OE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
j:qexhtho {
o$Ylqb# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9pPLOXr , bProcessed=TRUE;
[=BMvP5 }
n*Dn{ 7v#z }
'l`prp3 }
?G,gPb if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
!zm;C@}ln for(int index=0;index<MAX_KEY;index++){
_G-y{D_S& if(hCallWnd[index]==NULL)
u]7wd3( continue;
dWQB1Y*N if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
!V(r
p80 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
s*_fRf: //lParam的意义可看MSDN中WM_KEYDOWN部分
dHTx^1 }
-Ci&h }
^iBIp# }
)`(]jx! return CallNextHookEx( hHook, nCode, wParam, lParam );
cC>Svf[CzK }
TTFs|T6`q ~".@;Q 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:
Zhv%mUj~ VH~YwO!x BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
7)Vbp--b# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
i\l}M]Z# <xF]ca 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:
^e <E/j{~ K6
>\4'q LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
0}qlZFB {
@M B)B5 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
0ug&HEl_w {
Z]R#F0"U //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
qB,0(I1-! SaveBmp();
zRD-[Z/- return FALSE;
H8[A*uYL
}
uSRhIKy …… //其它处理及默认处理
A)3H`L }
?>7-a~*A@ a*LfT<hmU3 0+ $gR~^^ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
s2NBYDi$? 1%*\*z
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。
G`kz 0Vk U|Gy 9" 二、编程步骤
Uavl%Q PU,$YPrZ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
8{/.1: D>7J[ Yxg- 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
M-@X&bm,S N)
_24 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
7L6L{~8
W ]uypi#[ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
(DY[OIHI H\a"=&M 5、 添加代码,编译运行程序。
\.O&-oi Wh| T3& 三、程序代码
/z4c>)fV S}
OO) ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
dd<l;4( #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
~ gff{Nzk #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
;h+~xxu=X #if _MSC_VER > 1000
[RN]?, #pragma once
5|*`} ;/y #endif // _MSC_VER > 1000
Gj-nTN #ifndef __AFXWIN_H__
e%L[bGW' #error include 'stdafx.h' before including this file for PCH
[%^sl>,7 #endif
C$PS@4'U #include "resource.h" // main symbols
'UWkJ2:! class CHookApp : public CWinApp
{9}CU~R {
oC49c~`8 public:
jF0"AA CHookApp();
1<73uR&b% // Overrides
`MuX/[q // ClassWizard generated virtual function overrides
65qqs|&w;[ //{{AFX_VIRTUAL(CHookApp)
_Iav2=0Wi public:
} v:YSG virtual BOOL InitInstance();
-ycYQ~R virtual int ExitInstance();
mc8Q2eQat} //}}AFX_VIRTUAL
!|xB>d
q? //{{AFX_MSG(CHookApp)
t~j6w sx; // NOTE - the ClassWizard will add and remove member functions here.
\q1tT!] // DO NOT EDIT what you see in these blocks of generated code !
<MkvlLu((o //}}AFX_MSG
~Ay)kv; DECLARE_MESSAGE_MAP()
HrvyI)4{ };
fxPg"R!1i LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
gAdqZJR%] BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
0jlM~ H BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
n.2:fk BOOL InitHotkey();
j\~,Gtn>Z BOOL UnInit();
qc
@cdi #endif
./k7""4
jb&MC2 //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
y<
*-& #include "stdafx.h"
IJGw<cB]+ #include "hook.h"
M=uT8JB #include <windowsx.h>
G@`F{l #ifdef _DEBUG
HS{Vohy > #define new DEBUG_NEW
rx2']. #undef THIS_FILE
CL1*pL static char THIS_FILE[] = __FILE__;
|*NZ^6`@ #endif
Ld}?da Pj #define MAX_KEY 100
Fb]+h)on #define CTRLBIT 0x04
zG6l8%q'UE #define ALTBIT 0x02
!9_(y~g{N #define SHIFTBIT 0x01
ftxL-7y% #pragma data_seg("shareddata")
7[;!e nO HHOOK hHook =NULL;
{sC Ni UINT nHookCount =0;
b~,e(D9DG static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
196a~xNV static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
d'ZNp2L static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
}`<&l static int KeyCount =0;
Ph[MXb:* static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
D/."0 #q #pragma data_seg()
vnvpb!
@Q HINSTANCE hins;
"x=\mA#` void VerifyWindow();
.A<Hk1(-) BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
t!qLgJ5%y //{{AFX_MSG_MAP(CHookApp)
N, Ma\D+^t // NOTE - the ClassWizard will add and remove mapping macros here.
ErK1j // DO NOT EDIT what you see in these blocks of generated code!
f_S$CFa@ //}}AFX_MSG_MAP
6Bjo9,L END_MESSAGE_MAP()
}OAU5P!rp PO"lY'W.U CHookApp::CHookApp()
T\}U{9ELL {
)dhR&@r*w // TODO: add construction code here,
w!20 // Place all significant initialization in InitInstance
Ldz]FB| }
5;0w({1l B-C$>H^ CHookApp theApp;
`-pwP LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
?lsK?>uU {
.u7}p# BOOL bProcessed=FALSE;
=Z:]% if(HC_ACTION==nCode)
Th9V8Rg+E {
JfN5#+_i if((lParam&0xc0000000)==0xc0000000){// Key up
!t23
_b0 switch(wParam)
,]2?S5R {
= ){G case VK_MENU:
uxU-N MaskBits&=~ALTBIT;
xOe1v9< break;
UGO;5! case VK_CONTROL:
XMI*obS'z MaskBits&=~CTRLBIT;
bN.
G%1 break;
O0#[hY, case VK_SHIFT:
j;-Wf6h{ MaskBits&=~SHIFTBIT;
dw <i)P^
break;
>6o <Q default: //judge the key and send message
%`&n ;K.c break;
p<r<Y% }
7_1 Iadb for(int index=0;index<MAX_KEY;index++){
)-3~^Y#r_ if(hCallWnd[index]==NULL)
LBy`N_@ continue;
_ Lh0 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_C/|<Ot: {
M?h{'$T SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
G7 UUx+ X bProcessed=TRUE;
8IlUbj }
$?PI>9g! }
|KYl'"5\ }
kzZgNv#G; else if((lParam&0xc000ffff)==1){ //Key down
o&1mX switch(wParam)
{:gx*4}q8 {
HqWWWCWal case VK_MENU:
Zmyq6.1q~ MaskBits|=ALTBIT;
crIF5^3Yby break;
9xK>fM&u case VK_CONTROL:
@n)?=[p MaskBits|=CTRLBIT;
/ 3N2?zS{ break;
~JL
qh case VK_SHIFT:
_VT{2`|}) MaskBits|=SHIFTBIT;
F+H]{ss> break;
v8f3B<kj default: //judge the key and send message
@GKDSS4jv break;
SiaNL: }
Z?o0Q\}1 for(int index=0;index<MAX_KEY;index++)
aze#Cn,P} {
'r!!W0-K if(hCallWnd[index]==NULL)
W/2y;@ continue;
]vQa~} if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FFw(`[A_ {
K]m#~J3d> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
s=jmvvs_V} bProcessed=TRUE;
#g6 _)B=S }
H2jypVs$2 }
A5Jadz~ }
%0-oZL if(!bProcessed){
oT{9P?K8 for(int index=0;index<MAX_KEY;index++){
u*
pQVU if(hCallWnd[index]==NULL)
1Gr^,Ry continue;
-KGJr if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
ExO#V9DaW SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
QfEJU8/5d }
,9ueHE }
"> Qxb.Y} }
PL=v,NB return CallNextHookEx( hHook, nCode, wParam, lParam );
h~#F2#. }
l\{Qnb( *,X)tZ6VX BOOL InitHotkey()
}SSg>.48w {
viG= Ap.Th if(hHook!=NULL){
7-B|B{] nHookCount++;
rB+ ( return TRUE;
Hj
>fg2/ }
DIGw4g4Kt else
6Mc&=}bV hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
fh =R if(hHook!=NULL)
.$-;`&0cZ nHookCount++;
DLbP$&o return (hHook!=NULL);
k$%{w\?Jf }
#eKKH]J/ BOOL UnInit()
hD5@PeLh {
cY!Y?O if(nHookCount>1){
m%J?5rR3 nHookCount--;
'QE8 return TRUE;
=r/K#hOR\J }
6E) T;R(@ BOOL unhooked = UnhookWindowsHookEx(hHook);
EN`JzLjP if(unhooked==TRUE){
28^/By:J nHookCount=0;
G%~V b hHook=NULL;
|gA@$1+} }
:/(G#ZaV return unhooked;
IA0vSF: }
8x1!15Wiz &pI\VIx ? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
YTTy6*\,_ {
E4Q`)6]0 BOOL bAdded=FALSE;
On);SN' for(int index=0;index<MAX_KEY;index++){
O])vR< [ if(hCallWnd[index]==0){
\)28,` hCallWnd[index]=hWnd;
auN8M. HotKey[index]=cKey;
yam'LF HotKeyMask[index]=cMask;
Qf0P"s` bAdded=TRUE;
w31O~Ve KeyCount++;
aN"YEL>w break;
:gRrM)n }
2f:h z }
D?E
VzG return bAdded;
pu MVvo }
AT
t.}- Z%o.kd" BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ypM,i {
6T4"m BOOL bRemoved=FALSE;
'dwsm7Xd for(int index=0;index<MAX_KEY;index++){
5L6.7}B if(hCallWnd[index]==hWnd){
$!G|+OuTR if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
VT>-* hCallWnd[index]=NULL;
d
>L8SL HotKey[index]=0;
FsUH/Y
y HotKeyMask[index]=0;
P:6K bRemoved=TRUE;
51s\)d%l KeyCount--;
rs4:jS$) break;
>%6j -:S }
f|~'(~Sr }
=X'EDw }
;woK96"{t return bRemoved;
1Mq"f7X8
}
suQ`a_zJ GX19GI@k void VerifyWindow()
>7a
ENKOg: {
fPN/Mxu for(int i=0;i<MAX_KEY;i++){
%zc.b if(hCallWnd
!=NULL){ G{.=27
if(!IsWindow(hCallWnd)){ 7oLl RU
hCallWnd=NULL; mK M[[l&A
HotKey=0; Flpl,|n
a
HotKeyMask=0; J8FzQ2
KeyCount--; 9i #,V@
} dT1UYG}>j
} )`k+Oyvi<
} ajRht +{
} Q>yj<DR
m?Jnb\0
BOOL CHookApp::InitInstance() dh}"uM}a
{
L9hL@
AFX_MANAGE_STATE(AfxGetStaticModuleState()); mq<:^
hins=AfxGetInstanceHandle(); 56."&0
InitHotkey(); ^38kxwh
return CWinApp::InitInstance(); 9&kY>M>z0
} :1'1n
x2~fc
int CHookApp::ExitInstance() 5Q}HLjG8Z
{ !b K;/)
VerifyWindow(); 4cm~oZ
UnInit(); :'t"kS
return CWinApp::ExitInstance(); \py&v5J)s!
} N<(rP1)`v
Y,n8co^
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *s1o?'e
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U2_;
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 31g1zdT!
#if _MSC_VER > 1000 ^l(,'>Cn
#pragma once j}h%,
7
#endif // _MSC_VER > 1000 r+]a
Qc9[/4R>
class CCaptureDlg : public CDialog mV7_O//
{ |[V6R\l39
// Construction -K^(L#G
public: muK)Yw[#N
BOOL bTray; w0>5#jq#r
BOOL bRegistered; >&Ye(3w&
BOOL RegisterHotkey(); |%Y =]@f
UCHAR cKey; B
4e}%
UCHAR cMask; /KiaLS
void DeleteIcon(); Q Na*Y@i
void AddIcon(); R8% u9o
UINT nCount; }/ xdHt
void SaveBmp(); k3
' 5Ei
CCaptureDlg(CWnd* pParent = NULL); // standard constructor \>/AF<2"
// Dialog Data $H,9GIivD
//{{AFX_DATA(CCaptureDlg) ='/#G0W
enum { IDD = IDD_CAPTURE_DIALOG }; }q/[\3
CComboBox m_Key; 5',b~Pp
BOOL m_bControl; R;/LB^X]
BOOL m_bAlt; 2zjY|g/
BOOL m_bShift; \<=.J`o{
CString m_Path; 78mJ3/?rC
CString m_Number; FP6JfI8
//}}AFX_DATA fb]=MoiJ
// ClassWizard generated virtual function overrides 7z&^i-l.
//{{AFX_VIRTUAL(CCaptureDlg) \Zk<|T61$
public: w/0;N`YB
virtual BOOL PreTranslateMessage(MSG* pMsg); %eu_Pr 6X
protected: H~<wAer,Op
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e $5s],,n
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +zFEx%3^
//}}AFX_VIRTUAL RoD9
// Implementation z\IZ5'
protected: B<!wh
HICON m_hIcon; 1N8YD .3
// Generated message map functions BGT`) WP
//{{AFX_MSG(CCaptureDlg) xiQd[[(sM
virtual BOOL OnInitDialog(); 1$c[G}h
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =?B[oq
afx_msg void OnPaint(); `? f sU
afx_msg HCURSOR OnQueryDragIcon(); TsRbIq[
virtual void OnCancel(); 49#?I:l
afx_msg void OnAbout(); m`3gNox
afx_msg void OnBrowse(); VS<w:{*
afx_msg void OnChange(); -uK@2}NZ
//}}AFX_MSG ubi6=
DECLARE_MESSAGE_MAP() .V^h< d{
}; HtI>rj/\
x
#endif @v\jL+B+m
"8yDqm
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 52Q~` t7F
#include "stdafx.h" QTI^?@+N>
#include "Capture.h" Z5>}
#include "CaptureDlg.h" !:dhK
#include <windowsx.h> y=WCR*N
#pragma comment(lib,"hook.lib") p["20?^
#ifdef _DEBUG 7!,
p,|K
#define new DEBUG_NEW $5yH8JU
#undef THIS_FILE ]FO)U
static char THIS_FILE[] = __FILE__; EG!):P
#endif {$-\)K
#define IDM_SHELL WM_USER+1 C'0=eel[
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .$-%rU:*}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1\Vp[^#Vx
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !%yd'"6Dl
class CAboutDlg : public CDialog ez *O'U
{ cU=/X{&Om
public: [IuF0$w=dj
CAboutDlg(); |G>Lud
// Dialog Data a`QKNrA2
//{{AFX_DATA(CAboutDlg) WPNvZg9*c
enum { IDD = IDD_ABOUTBOX }; 2k""/xMF'
//}}AFX_DATA cX-)]D
// ClassWizard generated virtual function overrides /SYzo4(
//{{AFX_VIRTUAL(CAboutDlg) WO6; K]
protected: A&;Pt/#'
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K"ytE2:3
//}}AFX_VIRTUAL e/u(Re
// Implementation r)t-_p37
protected: Xc@%_6
//{{AFX_MSG(CAboutDlg) 4EEXt<c.
//}}AFX_MSG X6c ['Zrc
DECLARE_MESSAGE_MAP() _S#3!Wx
}; &l1CE19<
umj5M5oe3
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +QVe -
{ !F*CE cB
//{{AFX_DATA_INIT(CAboutDlg) DC%H(2
//}}AFX_DATA_INIT +aIy':P
} C")NNs=
wrt^0n'r)c
void CAboutDlg::DoDataExchange(CDataExchange* pDX) erZ%C <
{ l7=WO#Pb
CDialog::DoDataExchange(pDX); 5oIgxy
//{{AFX_DATA_MAP(CAboutDlg) _LSf
)
//}}AFX_DATA_MAP 9l9|w4YJs
} z}m)u
Ni 5Su
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L%O(
I
//{{AFX_MSG_MAP(CAboutDlg) j*)K>
\
// No message handlers p=U5qM.O
//}}AFX_MSG_MAP :Qra9;
Y
END_MESSAGE_MAP() o5 eFLJ6
Nl `8Kcv
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) E; Z1HF
R
: CDialog(CCaptureDlg::IDD, pParent) @#5PPXp
{ u~a@:D/F{G
//{{AFX_DATA_INIT(CCaptureDlg) HGRH9W
m_bControl = FALSE; 6*H F`@(
m_bAlt = FALSE; 'xY@I`x
m_bShift = FALSE; s\dF7/b
m_Path = _T("c:\\"); ;X3bgA']
m_Number = _T("0 picture captured."); J~vK`+Zs
nCount=0; !>5!Fb=Sy
bRegistered=FALSE; Enj],I
bTray=FALSE; )Dq/fW
//}}AFX_DATA_INIT ;iEFG^'tG
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KUqD<Jj?
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); HNtl>H
} ?rn#S8nNx<
,d34v*U
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ()v{HBi
{ & ]/Z~V t
CDialog::DoDataExchange(pDX); C|A:^6d3=
//{{AFX_DATA_MAP(CCaptureDlg) [m3k_;[
DDX_Control(pDX, IDC_KEY, m_Key); p#95Q
DDX_Check(pDX, IDC_CONTROL, m_bControl); PH}^RR{H[
DDX_Check(pDX, IDC_ALT, m_bAlt); _mw(~r8R
DDX_Check(pDX, IDC_SHIFT, m_bShift); hd}"%9p
DDX_Text(pDX, IDC_PATH, m_Path); OjiQBsgnj
DDX_Text(pDX, IDC_NUMBER, m_Number); \!4sd2Yi
//}}AFX_DATA_MAP %v(\;&@
} (7g1eEK%
"~lGSWcU
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) p$cSES>r:
//{{AFX_MSG_MAP(CCaptureDlg) &t\KKsUtd
ON_WM_SYSCOMMAND() {r!X W
ON_WM_PAINT() <ZM8*bqi
ON_WM_QUERYDRAGICON() yr
/p3ys
ON_BN_CLICKED(ID_ABOUT, OnAbout) 7BhRt8FSD+
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) h[O!kwE
ON_BN_CLICKED(ID_CHANGE, OnChange) oLXQ#{([
//}}AFX_MSG_MAP D'823,-).
END_MESSAGE_MAP() Y"&c .
c*g(R.!
BOOL CCaptureDlg::OnInitDialog() ,4wZ/r>
d
{ Lc<C1I 5=
CDialog::OnInitDialog(); =K)au$BE|
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 4V`ypFme
ASSERT(IDM_ABOUTBOX < 0xF000); /#M|V6n
CMenu* pSysMenu = GetSystemMenu(FALSE); qeyBZ8BG
if (pSysMenu != NULL) HEjrat;5
{ Wh)QCp0|n
CString strAboutMenu; X>#!s Lt
strAboutMenu.LoadString(IDS_ABOUTBOX); 7QlA/iKqK
if (!strAboutMenu.IsEmpty()) 5!PU+9Kh
{ m{bw(+r
pSysMenu->AppendMenu(MF_SEPARATOR); H[{ch t
h
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <eq93
} IRZ?'Im
} ;?9u#FRtw
SetIcon(m_hIcon, TRUE); // Set big icon |'2E'?\/x
SetIcon(m_hIcon, FALSE); // Set small icon P2`!)teN
m_Key.SetCurSel(0); <,Zk9 t&
RegisterHotkey(); V}>0r+NL<
CMenu* pMenu=GetSystemMenu(FALSE); `~"l a>}
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "yI)F~A
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7
C5m#e3
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~pqp`
return TRUE; // return TRUE unless you set the focus to a control PQ2u R
} *HwTq[y
{qm(Z+wcmb
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b7/1]
{ @GYM4T
if ((nID & 0xFFF0) == IDM_ABOUTBOX) :LL>C)(f
{ vTD`Ja#h
CAboutDlg dlgAbout; ^zv28Wq>
dlgAbout.DoModal(); Pv`^#BX'
} a"{tq Nc
else ?hS n)
{ m#'2
3
CDialog::OnSysCommand(nID, lParam); o(.
PxcD
} JeJc(e
} 7K`A2
L44-: 3
void CCaptureDlg::OnPaint() a<[@p
{ 1@H3!V4
if (IsIconic()) _AQ :<0/#
{ :CN,I!:
CPaintDC dc(this); // device context for painting hIw<gb4J%
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); qPpC )6-Q
// Center icon in client rectangle j0k"iv
int cxIcon = GetSystemMetrics(SM_CXICON); >Z?3dM~ [
int cyIcon = GetSystemMetrics(SM_CYICON); AO9F.A<T5
CRect rect; ;fhFv&`mE
GetClientRect(&rect); *N$#cz
int x = (rect.Width() - cxIcon + 1) / 2; tLpDIA_8
int y = (rect.Height() - cyIcon + 1) / 2; 4
~17s`+
// Draw the icon ejwFQ'wTx
dc.DrawIcon(x, y, m_hIcon); 67Ai.3dR
} m?_S&/+*
else o_<o8!]l"
{ #Vanw !
CDialog::OnPaint(); aIk%$M at
} YSt' ]
} n-dO |3,
-\j}le6;c
HCURSOR CCaptureDlg::OnQueryDragIcon() LD WFc_
{ Da)[mxJ
return (HCURSOR) m_hIcon; C CX\"-C
} }abM:O
"Y
g[j"]~
void CCaptureDlg::OnCancel() <Ja>
{ ,k/*f+t
if(bTray) p~28?lYv
DeleteIcon(); xX
CDialog::OnCancel(); =%|S$J
} S"w$#"EJA
Warz"n]iC
void CCaptureDlg::OnAbout() fAf sKO*
{ PKu+$
CAboutDlg dlg; jd=k[Yqr
dlg.DoModal(); ;y?,myO
} \{n]&IjA
i
4eb\j
void CCaptureDlg::OnBrowse() 1P4jdp=~
{ oa+Rr&t'
CString str; 0?ZJJdI3
BROWSEINFO bi; S
1|[}nYP
char name[MAX_PATH]; <?,o
{
ZeroMemory(&bi,sizeof(BROWSEINFO)); *;O$=PE
bi.hwndOwner=GetSafeHwnd(); ;*+jCL2F
bi.pszDisplayName=name; VZJs@qx:Z
bi.lpszTitle="Select folder"; |J2Rwf
bi.ulFlags=BIF_RETURNONLYFSDIRS; (hVhzw"~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); CJ&0<Z}{m
if(idl==NULL) ZYrXav<
return; &M~*w~w`
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0,nDyTS^
str.ReleaseBuffer(); uA:|#mO
m_Path=str; iU{F\>
if(str.GetAt(str.GetLength()-1)!='\\') c0u!V+V%
m_Path+="\\"; f>5{SoM
UpdateData(FALSE); qr(SAIX"
} <O>r e3s
9>qR6k?
void CCaptureDlg::SaveBmp() waW2$9O
{ A5+vz u^
CDC dc; z:|4S@9
dc.CreateDC("DISPLAY",NULL,NULL,NULL); .wx;!9
CBitmap bm; AU$W=Z*
int Width=GetSystemMetrics(SM_CXSCREEN); Zo22se0)
int Height=GetSystemMetrics(SM_CYSCREEN); nvxftbfE^D
bm.CreateCompatibleBitmap(&dc,Width,Height); N9Yc\?_NU_
CDC tdc; Tul_/` An
tdc.CreateCompatibleDC(&dc); |~CN]N
CBitmap*pOld=tdc.SelectObject(&bm); ;58l_ue
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); s6w</
tdc.SelectObject(pOld); Z6X?M&-Lz
BITMAP btm; yEy}
PCJ&
bm.GetBitmap(&btm); Sq}hx
DWORD size=btm.bmWidthBytes*btm.bmHeight; >"B95$x5
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); oKiBnj5J
BITMAPINFOHEADER bih; (J][(=s;a
bih.biBitCount=btm.bmBitsPixel; wnP#.[,V
bih.biClrImportant=0; <Jo_f&&{
bih.biClrUsed=0; <n>Kc}c
bih.biCompression=0; FlRbGg^
bih.biHeight=btm.bmHeight; q/?#+d
bih.biPlanes=1; WsQo+Ua
bih.biSize=sizeof(BITMAPINFOHEADER); 7Xm pq&g
bih.biSizeImage=size; U/m6% )Yx(
bih.biWidth=btm.bmWidth; ;c_X
^"d
bih.biXPelsPerMeter=0; 0CQ\e1S,#
bih.biYPelsPerMeter=0; 1Qtojph
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &
p"ks8"
static int filecount=0; N0sf
V
CString name; 4_8%ZaQ\.?
name.Format("pict%04d.bmp",filecount++); a [iC!F2
name=m_Path+name; %7Z_Hw
BITMAPFILEHEADER bfh; y|nMCkuX
bfh.bfReserved1=bfh.bfReserved2=0; 9PVM06
bfh.bfType=((WORD)('M'<< 8)|'B'); )Rn}4)9!iT
bfh.bfSize=54+size; 7:I`
~ @m
bfh.bfOffBits=54; j{IAZs#@>
CFile bf; ,-&ler~[
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ VieC+Kk
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $[6:KV
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); T#Qn\8
bf.WriteHuge(lpData,size); { o=4(RC
bf.Close(); I`}-*%ki(
nCount++; AM1 J ^Dp
} "6lf~%R"
GlobalFreePtr(lpData); OA_:_%a(
if(nCount==1) LXG,IG
m_Number.Format("%d picture captured.",nCount); Mje6Q
else d3+pS\&IX?
m_Number.Format("%d pictures captured.",nCount); xpKD 'O=T
UpdateData(FALSE); lq}= &)%C
} <K%qaf
!,+peMy
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5v=%pQbY
{ &eG,CIT
if(pMsg -> message == WM_KEYDOWN) >
F&Wuf
{ D:U:( pg
if(pMsg -> wParam == VK_ESCAPE) 4T`u?T]
return TRUE; d Ayof=
if(pMsg -> wParam == VK_RETURN) !1]72%k[
return TRUE; K~5QL/=1
} p}hOkx4R\
return CDialog::PreTranslateMessage(pMsg); 7KnZ
} cj`g)cX|
=M>1;Qr<Z/
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D%N^iJC,9
{ =2BGS\$#
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j#"?Oe{_1
SaveBmp(); I&U?8
return FALSE; KtU I(*$`
} YBN@{P$
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p)N=
CMenu pop; FRQ0tIp
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G,e>dp_cPu
CMenu*pMenu=pop.GetSubMenu(0); DmM<Kkg.J
pMenu->SetDefaultItem(ID_EXITICON); lplEQ]J|
CPoint pt; WLQm|C,
GetCursorPos(&pt); P&V,x`<Z
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SG2s!Ht
if(id==ID_EXITICON) 5vj;lJKcd`
DeleteIcon(); "GEJ9_a[
else if(id==ID_EXIT) h!?7I=p~#
OnCancel(); N0oBtGb
return FALSE; ;"hED:z6%
} +u#;k!B/>
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,OsFv}v7
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) YgNt>4K
AddIcon(); ^]3Y11sI
return res; sWP5=t(i+9
} Yj|Oy
Cb7f-Eag
void CCaptureDlg::AddIcon() tI|?k(D
{ K4YpE}]u
NOTIFYICONDATA data; <f &z~y=
data.cbSize=sizeof(NOTIFYICONDATA); Dj'aWyW'
CString tip; \?{nP6=
tip.LoadString(IDS_ICONTIP); ?~$0;5)QC
data.hIcon=GetIcon(0); )Ge.1B$8h
data.hWnd=GetSafeHwnd(); "~0m_brf
strcpy(data.szTip,tip); V.vA~a
data.uCallbackMessage=IDM_SHELL; t&T0E.kh*X
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &[f.;1+C
data.uID=98; ~0,Utqy
Shell_NotifyIcon(NIM_ADD,&data); dElOy?v
ShowWindow(SW_HIDE); -@X?~4Idz
bTray=TRUE; XZYpU\K
} H'Bor\;[>
r t@Jw]az
void CCaptureDlg::DeleteIcon() fpJM)HU
{ vyP3]+n
NOTIFYICONDATA data; 1P:r=Rt/
data.cbSize=sizeof(NOTIFYICONDATA); 0W<:3+|n4
data.hWnd=GetSafeHwnd(); obKWnet
data.uID=98; "5"6mw?
Shell_NotifyIcon(NIM_DELETE,&data); @r]wZ~@
ShowWindow(SW_SHOW); A9'
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SetForegroundWindow(); uo;aC$US
ShowWindow(SW_SHOWNORMAL); fhw.A5Ck
bTray=FALSE; IugYlt
} W+-a@)sh3Q
4HQP,
void CCaptureDlg::OnChange() hqIYo
.<
{ N=^{FZ
RegisterHotkey(); Gx
ci
} `mXbF
[`nY/g:
BOOL CCaptureDlg::RegisterHotkey() k
#y4pF_
{ ;UTT>j
UpdateData(); 17AJT
UCHAR mask=0; Dj}n!M`2I
UCHAR key=0; mr
dG-t(k
if(m_bControl) +b"RZ:tKp
mask|=4; bwR_ uF
if(m_bAlt) Q?-HU,RBO
mask|=2; +ntrp='7O7
if(m_bShift) P9=L?t.
mask|=1; PXqLK3AE
key=Key_Table[m_Key.GetCurSel()]; knrR%e;
if(bRegistered){ d0ThhO
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7cV9xIe^
bRegistered=FALSE; xdb9oH
} wNMg Y
cMask=mask; AuuZWd
cKey=key; <7N8L
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M3c!SXx\
return bRegistered; DFKFsu8s
} 4A6D>ChB'E
Pj9n`LwM
四、小结 8.FBgZh*
/HbxY
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。