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:
n0o'ns
99T_y`df 一、实现方法
J{98x zb KH4
5A'o 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:
PA5_ O0?.$f9 s #pragma data_seg("shareddata")
|T53m;D HHOOK hHook =NULL; //钩子句柄
],rtSUO UINT nHookCount =0; //挂接的程序数目
d',OQ,~{ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
zE"ME*ou static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
qPgLSZv static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
76i)m! static int KeyCount =0;
Nr.maucny static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
3EGQ$ #pragma data_seg()
3q*y~5&I Z<@Kkbj 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。
<|= UrG R#ayN* 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:
8=
jl]q$< vRm.#+Td BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
W}6(; tI cKey,UCHAR cMask)
l V[d`%( {
tz(\|0WDQ BOOL bAdded=FALSE;
n[zP}YRr for(int index=0;index<MAX_KEY;index++){
y(M- if(hCallWnd[index]==0){
dQfVdqg hCallWnd[index]=hWnd;
PZn[Yb: HotKey[index]=cKey;
?b?`(JTR HotKeyMask[index]=cMask;
klC;fm2C bAdded=TRUE;
["|' f KeyCount++;
#*^vd{fl break;
=3rPE"@,[ }
oiP8~ }
\I
r&&% return bAdded;
y~)rZ-eSB }
Eq>3|(UT //删除热键
w_30g6tA BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
7I~Ww{ {
,fS}cpV BOOL bRemoved=FALSE;
@WIcH:_w- for(int index=0;index<MAX_KEY;index++){
(eS/Q%ZGK if(hCallWnd[index]==hWnd){
KjR^6v if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
FYIzMp.4 hCallWnd[index]=NULL;
v,t&t9}/ HotKey[index]=0;
SJY<#_b HotKeyMask[index]=0;
R["2kEF bRemoved=TRUE;
5m,{?M` KeyCount--;
J[9yQ break;
D[. ; H)V }
AJ-p|[wPz }
"kC uCc }
[jl'5l d return bRemoved;
Uf^zA/33 }
Kg0Vbzvb C2GF
N1i I8r5u=PH DLL中的钩子函数如下:
wN,DTmtD
1
h(oty2p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
i3I'n* {
b#p)bcz!I BOOL bProcessed=FALSE;
J{$+\ if(HC_ACTION==nCode)
[u[`!L= {
%OW LM if((lParam&0xc0000000)==0xc0000000){// 有键松开
u}u;jTi>2 switch(wParam)
uLV@D r {
~@ZdO+n? case VK_MENU:
jbQ2G|:Q MaskBits&=~ALTBIT;
fu|N{$h%X break;
@MIBW)P< case VK_CONTROL:
jRN*W2]V MaskBits&=~CTRLBIT;
0raVC=[ break;
.uzg2Kd_ case VK_SHIFT:
]_NN,m>z MaskBits&=~SHIFTBIT;
8U!; break;
Hl"rGA> default: //judge the key and send message
'0g1v7Gx break;
iq$edq[ }
#yZZ$XO k for(int index=0;index<MAX_KEY;index++){
?c)PBJ+] if(hCallWnd[index]==NULL)
q0Fq7rWP continue;
ZN!OM)@:! if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
uN bOtA {
IWeQMwg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
usiv`.
bProcessed=TRUE;
sGIY\% }
'$u3i
#.\ }
1Sox@Ko }
=jvM$ else if((lParam&0xc000ffff)==1){ //有键按下
)e.Y"5My switch(wParam)
+}c
'4hRv {
4,L( case VK_MENU:
IVD1mk MaskBits|=ALTBIT;
?Dro)fH1 break;
5T,Doxo case VK_CONTROL:
gwk$|aT@ MaskBits|=CTRLBIT;
kYBTmz}z break;
}B2H)dG^K case VK_SHIFT:
dsP|j(y MaskBits|=SHIFTBIT;
|K?fVL break;
`j*&F8} default: //judge the key and send message
QjETu break;
iMRb`
\KH }
<)y44x|S' for(int index=0;index<MAX_KEY;index++){
(g,lDU[= if(hCallWnd[index]==NULL)
Q\G8R^9j p continue;
Izq]nR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
YK *2 {
a,o)i8G9R< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
U#G[#sd> K bProcessed=TRUE;
A0.)=q }
j"o`K}C }
J 2%^%5&0 }
dDN#>| if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+7?p&-r)x for(int index=0;index<MAX_KEY;index++){
2<}^m/} if(hCallWnd[index]==NULL)
q[{q3-W continue;
/km^IH if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Be+'&+ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]c{Zh?0 //lParam的意义可看MSDN中WM_KEYDOWN部分
\7Hzj0hSi }
ey<u }
v'* }
"!<Kmh5 return CallNextHookEx( hHook, nCode, wParam, lParam );
V x1C4 }
j &)Xi^^ :P`sK&b_ 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:
b)@%gS\F 3F2> &p|7 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_F
xq BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
DG8]FhD^b Et@= <g 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:
.!0),KmkK i' J.c4 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
kRNr`yfN {
$wU.GM$t~ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
c38RE,4U {
p,}-8#K[ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
^_3idLE SaveBmp();
x!bFbi#!" return FALSE;
%cG6=`vR }
9 m&"x/k …… //其它处理及默认处理
N;tUrdgQ }
o:#l r{ r/=v;4.W !q~s-~d^ 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。
<uNBsYMuC =]E(iR_& 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。
STu!v5XY}- g[Ah>
5 二、编程步骤
'qQ 5K
o e/lfT?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";
'1;Q'-/J {U(-cdU{e` 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
r=4'6! qdh;zAMx 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;
"L.)ML a*hOT_;# 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;
5%D:wS1 h>= e<H?f 5、 添加代码,编译运行程序。
s<'^
@Y K"Vv= 三、程序代码
A/RHb^N k\|G%0Jw ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
<aa#OX #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
>i~W$;t #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
`,H\j? #if _MSC_VER > 1000
5%(J +d #pragma once
Gm^@lWzG #endif // _MSC_VER > 1000
mbv\Gn#> #ifndef __AFXWIN_H__
,@%1q)S?A #error include 'stdafx.h' before including this file for PCH
EiWy`H; #endif
S%uH*&` #include "resource.h" // main symbols
sR,]eo<p& class CHookApp : public CWinApp
* X\i=
K! {
1i#uKKwE public:
r&)/3^S ' CHookApp();
0F=UZf& // Overrides
K"VphKvR // ClassWizard generated virtual function overrides
LtbL[z>] //{{AFX_VIRTUAL(CHookApp)
s4P8PDhz public:
nlXg8t^G virtual BOOL InitInstance();
MBs]<(RJZ virtual int ExitInstance();
,kuJWaUC@ //}}AFX_VIRTUAL
.Br2^F //{{AFX_MSG(CHookApp)
+l@H[r;$ // NOTE - the ClassWizard will add and remove member functions here.
B)/X:[ // DO NOT EDIT what you see in these blocks of generated code !
m9Gyjr'L //}}AFX_MSG
2H;&E1: DECLARE_MESSAGE_MAP()
7&XU]I };
%!%3jo0t LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
?{%P9I BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
meu\jg BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
5tHv'@ BOOL InitHotkey();
OP]=MZP| BOOL UnInit();
Dk|S`3 #endif
iN+Dmq5 LW?] ~| //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
'VFxg, #include "stdafx.h"
]Rohf WHX #include "hook.h"
[Ua4{3# #include <windowsx.h>
dKDtj: #ifdef _DEBUG
-liVYI2s #define new DEBUG_NEW
PKT0Drv}c7 #undef THIS_FILE
?H eC+=/Z static char THIS_FILE[] = __FILE__;
SPOg' #endif
G%S=K2v #define MAX_KEY 100
+e<P7}ZQ #define CTRLBIT 0x04
LdI) #define ALTBIT 0x02
iq,qf)BY.| #define SHIFTBIT 0x01
LdR}v%EH #pragma data_seg("shareddata")
*ntq;] HHOOK hHook =NULL;
[%;LZZgl UINT nHookCount =0;
?VEJk,/k static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
l*uNi47| static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
qd~)Ya1 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
\.myLkm static int KeyCount =0;
;j=/2vU~@ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
n9gj{]% #pragma data_seg()
5[`!\vCiZ HINSTANCE hins;
\6)l(b; void VerifyWindow();
'P32G?1C&p BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
$5r[YdnY< //{{AFX_MSG_MAP(CHookApp)
w;0NtV| // NOTE - the ClassWizard will add and remove mapping macros here.
d]VL(& // DO NOT EDIT what you see in these blocks of generated code!
\hQ[5> //}}AFX_MSG_MAP
d?WA}VFU END_MESSAGE_MAP()
dMw7Lp& 0`"]mYH CHookApp::CHookApp()
6g8{;6x {
jIK*psaV // TODO: add construction code here,
YKf,vHau // Place all significant initialization in InitInstance
Namw[TgJ }
Y fk[mo af\>+7x93 CHookApp theApp;
kLR4?tX! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
m46Q%hwV {
.a:"B\B` BOOL bProcessed=FALSE;
\E9Z
H3; if(HC_ACTION==nCode)
r1EccY {
gR.zL>=_5e if((lParam&0xc0000000)==0xc0000000){// Key up
]p(+m_F switch(wParam)
ldrKk'S,B {
*PMvA1eN=# case VK_MENU:
Mr<2I MaskBits&=~ALTBIT;
\ :8~na+( break;
/tc*jXB case VK_CONTROL:
dn$1OhN8M MaskBits&=~CTRLBIT;
p&B98c break;
&zlwV"W case VK_SHIFT:
:g2?)Er- MaskBits&=~SHIFTBIT;
uT8/xNB! break;
OZ&J'Y default: //judge the key and send message
-LzHCO/7( break;
%Z 9<La }
!e&ZhtTuC for(int index=0;index<MAX_KEY;index++){
`Q1S8i$ if(hCallWnd[index]==NULL)
r|:|\"Yk continue;
uaNJTob if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%CfJ.;BDNE {
{ >{|3 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
AW&HWc~A bProcessed=TRUE;
I7 pxi$8f }
cE/7B'cR }
m'KY;C }
C&bw1`XJf else if((lParam&0xc000ffff)==1){ //Key down
7_.z3Km: switch(wParam)
Z8(1QU,~2 {
= PcmJG] case VK_MENU:
.UakO,"z MaskBits|=ALTBIT;
rhMsZ={M break;
x6* {@J&5* case VK_CONTROL:
kCL)F\v"iT MaskBits|=CTRLBIT;
I$\dT1m$ break;
Ljq/f&
c case VK_SHIFT:
:7D&=n ) MaskBits|=SHIFTBIT;
jRm:9`.Q break;
L^KGY<hp4 default: //judge the key and send message
O}MY:6Pe break;
[^A.$, }
Jn +[:s. for(int index=0;index<MAX_KEY;index++)
Z_}vjk~s {
7e/Uc!&* if(hCallWnd[index]==NULL)
F}DdErd!f continue;
sVZb[|zSri if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>"f,'S5* {
lzBy;i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Qpndi$2H! bProcessed=TRUE;
pNcNU[c }
*SzP7]1m }
AEX]_1TG }
[N$da=`wv if(!bProcessed){
`mQY%p| for(int index=0;index<MAX_KEY;index++){
muQH!Q if(hCallWnd[index]==NULL)
`x lsvK> continue;
Z=sy~6m+v if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$R2T) SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>>rW-& }
?t'ZX~k }
3q R@$pm }
Lt8chNi
[ return CallNextHookEx( hHook, nCode, wParam, lParam );
XASoS5 }
02Ur'| ME[Wg\ BOOL InitHotkey()
w
(W+Y+up {
gAhCNOp if(hHook!=NULL){
%RL\t5TV nHookCount++;
^b~&}uU return TRUE;
Kf76./ }
b3wE8Co else
$Tfq9 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
t LdBnf if(hHook!=NULL)
a^'1o9 nHookCount++;
y<m{eDV7 return (hHook!=NULL);
S6B(g_D| }
df
nmUE BOOL UnInit()
hqnJ@N$yY {
=$}P'[V if(nHookCount>1){
b=9(gZ 9 nHookCount--;
|VB}Kv
return TRUE;
`)`_G!a }
D%LqLLD BOOL unhooked = UnhookWindowsHookEx(hHook);
o$'Fz[U if(unhooked==TRUE){
>-r\]/^ nHookCount=0;
jC*(ZF1B hHook=NULL;
q]0a8[]3 }
(ivV [ return unhooked;
82&JYx }
4))u*c/, QUaz;kNC7 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#StD]d {
AU}lKq7% BOOL bAdded=FALSE;
9xB^dKM3 for(int index=0;index<MAX_KEY;index++){
vz)A~"E if(hCallWnd[index]==0){
= PqQJE} hCallWnd[index]=hWnd;
5{zXh HotKey[index]=cKey;
q#pBlJ.LK HotKeyMask[index]=cMask;
Tg&{P{$ bAdded=TRUE;
B cX}[?c KeyCount++;
2}'qu) break;
qDqIy+WR }
b+'G^!JR }
+e)So+.W return bAdded;
qlIC{:E0 }
/&$'v:VB Z_iu^Q BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#-'=)l}i1A {
i6kW"5t BOOL bRemoved=FALSE;
iVd*62$@$ for(int index=0;index<MAX_KEY;index++){
y rdJX if(hCallWnd[index]==hWnd){
+o?.<[>!GR if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
h.%VWsAO7 hCallWnd[index]=NULL;
weT33O"!1 HotKey[index]=0;
HyiuU` HotKeyMask[index]=0;
kN`[Q$B bRemoved=TRUE;
0(Vbji KeyCount--;
Z9i,#/ break;
L4zSro:Si }
ldM [8 }
Oe'Nn250
}
w^ui%9
&6H return bRemoved;
0Q;T
<%U }
)*G3q/l1u6 M`FsKK` void VerifyWindow()
DvG. G+mo# {
W2wDSP- for(int i=0;i<MAX_KEY;i++){
O*z x{a6 if(hCallWnd
!=NULL){ -vGyEd7
if(!IsWindow(hCallWnd)){ +AZ=nMgW
hCallWnd=NULL; ,M>W) TSH
HotKey=0; H'<9;bD -
HotKeyMask=0; 3rZFN^
KeyCount--; Fw+JhIVP
} o2W pi
} en=Z[ZIPO
} )"WImf:*
} 1HN_
V{HZ/p_Y
BOOL CHookApp::InitInstance() 8q)2)p
{ c?}C{
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3! dD!'
hins=AfxGetInstanceHandle(); LOX[h$
InitHotkey(); 7FqmT
return CWinApp::InitInstance(); (
]AErz+
} T?) U|
O!d^v9hM,
int CHookApp::ExitInstance() E;$t|~#
{ Ufq"_^4
VerifyWindow(); Wv77ef
UnInit(); ~`#.ZMO
return CWinApp::ExitInstance(); )FMpfC>An
} 3a:(\:?z
Y5-X)f
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'an{<82i
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b/"gkFe#
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kmy?`P10(z
#if _MSC_VER > 1000 GL@s~_;T6
#pragma once 0+/L?J3
#endif // _MSC_VER > 1000 <z#r3J
cK(}B_D$
class CCaptureDlg : public CDialog IQGIU3O
{ [dk|lkj@u\
// Construction B6 x5E
public: A{>]M@QC2
BOOL bTray; izY,t!
BOOL bRegistered; f4/!iiS}r
BOOL RegisterHotkey(); >%qGK-_
UCHAR cKey; ^M,t`r{
UCHAR cMask; ;1NZY.pyc
void DeleteIcon(); kC01s
void AddIcon(); U>e@m?
UINT nCount; 3 V8SKBS
void SaveBmp(); _L_SNjA_
CCaptureDlg(CWnd* pParent = NULL); // standard constructor oMLpl3pl
// Dialog Data 01H3@0Q6
//{{AFX_DATA(CCaptureDlg) csRba;Z[
enum { IDD = IDD_CAPTURE_DIALOG }; PaMi5Pq
CComboBox m_Key; YxS*im[%]
BOOL m_bControl; S^I38gJd
BOOL m_bAlt; qI<*Cze
BOOL m_bShift; eY\tO"Hc
CString m_Path; :lgIu .
CString m_Number; \Y>^L{
//}}AFX_DATA Lg9]kpOpa
// ClassWizard generated virtual function overrides s<E_74q1
//{{AFX_VIRTUAL(CCaptureDlg) I}n"6'*
public: b 7aAP*$
virtual BOOL PreTranslateMessage(MSG* pMsg); /P^@dL
protected: q<oA%yR
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support </bWFW~x
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~ZG>n{Q
//}}AFX_VIRTUAL cAVe(:k)
// Implementation &|9mM=^
protected:
6C
r$R]5
HICON m_hIcon; /W:}p(>4a
// Generated message map functions PM9HfQU?
//{{AFX_MSG(CCaptureDlg) m( B6FPjr
virtual BOOL OnInitDialog(); zLOmtZ(['
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,m3AVHa*G
afx_msg void OnPaint(); 5w}xjOYIjV
afx_msg HCURSOR OnQueryDragIcon(); -|J?-
virtual void OnCancel(); "N4c>2Q
afx_msg void OnAbout(); xqP0Z),Ow
afx_msg void OnBrowse(); BAzc'x&<
afx_msg void OnChange(); Gg5vf]VFo
//}}AFX_MSG &Radpb2p6
DECLARE_MESSAGE_MAP() /Klwh1E
}; js;IUSj.
#endif lDMYDy{<
i;6\tK"!
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~+l%}4RZ
#include "stdafx.h" _[0Ugfz(
#include "Capture.h" 9nM {x?
#include "CaptureDlg.h" _32ltnBX
#include <windowsx.h> !Z%QD\knY
#pragma comment(lib,"hook.lib") A.35WGu&:
#ifdef _DEBUG gxU(&
#define new DEBUG_NEW oS_'@u.5
#undef THIS_FILE uKpl+>
static char THIS_FILE[] = __FILE__; 86R}G/>>e
#endif -6+HA9zz@C
#define IDM_SHELL WM_USER+1 pNVao{::5
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G <Lm}
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xs.[]>nQN
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; kwWO1=ikz@
class CAboutDlg : public CDialog `+"QhQ4w
{ -7=pb#y
public: 5wGyM10
CAboutDlg(); f} Uw%S=w,
// Dialog Data xU@Z<d,k
//{{AFX_DATA(CAboutDlg) #Sn&Wo
enum { IDD = IDD_ABOUTBOX }; "_?^uymw
//}}AFX_DATA S'ikr
// ClassWizard generated virtual function overrides 7-^df0
//{{AFX_VIRTUAL(CAboutDlg) <408lm
protected:
~ikTo -
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HK2`.'D
//}}AFX_VIRTUAL y)s/\l&
// Implementation ;R2(Gb
protected: em>CSBx
//{{AFX_MSG(CAboutDlg) Yd/qcC(&
//}}AFX_MSG {W `/KU?u
DECLARE_MESSAGE_MAP() X 8[T*L.
}; 2$T~(tem
WY*}|R2R
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =1\'xz}p?
{ !my5-f>{(
//{{AFX_DATA_INIT(CAboutDlg)
9]AKNQq m
//}}AFX_DATA_INIT Ir0er~f+z
} ^e&,<+qY
s-8>AW
ep
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >vP^l
{SD
{ ?hfosBn&[
CDialog::DoDataExchange(pDX); T}u '
//{{AFX_DATA_MAP(CAboutDlg) 3`, m=1[)
//}}AFX_DATA_MAP 'JkK0a2D
} .`hlw'20
AiO,zjM =
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i"_f46rP
//{{AFX_MSG_MAP(CAboutDlg) b~#rUOXb8?
// No message handlers hR=4w$
//}}AFX_MSG_MAP \[,7#
END_MESSAGE_MAP() oiFtPki
n`^</0
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (TnYUyFP`
: CDialog(CCaptureDlg::IDD, pParent) Ef?_d]
{ m$@Cw Qj
//{{AFX_DATA_INIT(CCaptureDlg) k]f73r
m_bControl = FALSE; 0_&oMPY
m_bAlt = FALSE; `bH Eu"(,
m_bShift = FALSE; uQ8]j .0
m_Path = _T("c:\\"); kkzXv`+
m_Number = _T("0 picture captured."); JVXBm]
nCount=0; jkD5Z`D
bRegistered=FALSE; &VQwuO
bTray=FALSE; 6fkL@It
//}}AFX_DATA_INIT `8'|g8,wb0
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ge97e/CY
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /CX<k gz@
} j?.VJ^Ff/u
}F1^gN&QF
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) zA+^4/M
{ ?cpID8Z
CDialog::DoDataExchange(pDX); '4O1Y0K
//{{AFX_DATA_MAP(CCaptureDlg) 3}N:oJI$z
DDX_Control(pDX, IDC_KEY, m_Key); Kt`0vwkjvI
DDX_Check(pDX, IDC_CONTROL, m_bControl); ,l@hhaLm?
DDX_Check(pDX, IDC_ALT, m_bAlt); ^8fO3<Jg
DDX_Check(pDX, IDC_SHIFT, m_bShift); T.K$a\/{,
DDX_Text(pDX, IDC_PATH, m_Path); ,u\M7,a^
DDX_Text(pDX, IDC_NUMBER, m_Number); H:~LL0Md%
//}}AFX_DATA_MAP hPEK@
} M
rVtxzH
fY-{,+ `'
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v$,9l+p/
//{{AFX_MSG_MAP(CCaptureDlg) 5gEUE {S
ON_WM_SYSCOMMAND() !hJKI.XH
ON_WM_PAINT() sS+9ly{9J
ON_WM_QUERYDRAGICON() Y<kvJb&1*
ON_BN_CLICKED(ID_ABOUT, OnAbout) v"bOv"!al
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) yWX:`*GV
ON_BN_CLICKED(ID_CHANGE, OnChange) HPt"
//}}AFX_MSG_MAP T>1E
END_MESSAGE_MAP() Yoaz|7LS
KH[%HN5v
BOOL CCaptureDlg::OnInitDialog() { >4exyu6
{ $/pd[ H[{
CDialog::OnInitDialog(); IS8ppu&E
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fQe- v_K
ASSERT(IDM_ABOUTBOX < 0xF000); <M 7WWtmx
CMenu* pSysMenu = GetSystemMenu(FALSE); ?=
ulfGrY
if (pSysMenu != NULL) R%5\1!Fl=G
{ ';$2j~
CString strAboutMenu; vB#3jI
strAboutMenu.LoadString(IDS_ABOUTBOX); ,AM6E63
if (!strAboutMenu.IsEmpty()) o"5R^a@
{ JEBx|U$'Y
pSysMenu->AppendMenu(MF_SEPARATOR); VT-&"Jn
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); KDCq::P<
} ybB/sShGM
} 8"p>_K=
SetIcon(m_hIcon, TRUE); // Set big icon NShA-G N5
SetIcon(m_hIcon, FALSE); // Set small icon %,)[%>#{
m_Key.SetCurSel(0); T>L6 X:d
RegisterHotkey(); !O $EVl
CMenu* pMenu=GetSystemMenu(FALSE); `cf&4Hn
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); |\,e9U>
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }rOO[,?Y
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); k^ID
return TRUE; // return TRUE unless you set the focus to a control oOSw>23x
} sLB{R#Pt
;pC-0m0Y
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]Nm_<%lT
{ 7';PI!$
if ((nID & 0xFFF0) == IDM_ABOUTBOX) JLs7[W)O
{ OyTBgS G?a
CAboutDlg dlgAbout; z3>}(+
dlgAbout.DoModal(); PUucYc
} scrNnO[3j
else #~
/-n
{ )5e}Id
CDialog::OnSysCommand(nID, lParam); zvD$N-#`p
} c\-I+lMBi
} N/^r9Nu
)Ax1?Nx$
void CCaptureDlg::OnPaint() }`*]&I[P
{ y" P$:l
if (IsIconic()) K b{
{ L2Mcs
CPaintDC dc(this); // device context for painting 9[8?'`m
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (R Ttz
// Center icon in client rectangle ?p6+?\H
int cxIcon = GetSystemMetrics(SM_CXICON); 8Zwq:lV Q
int cyIcon = GetSystemMetrics(SM_CYICON); gLu#M:4N
CRect rect; %tmK6cY4Y
GetClientRect(&rect); ssoe$Gr7>
int x = (rect.Width() - cxIcon + 1) / 2; >#xpg&2x
int y = (rect.Height() - cyIcon + 1) / 2; iPI6 _h
// Draw the icon > \KBXS}
dc.DrawIcon(x, y, m_hIcon); syV&Ds)
} |} .Y&1@U
else C>t1~^Q},9
{ nh,N(t9
CDialog::OnPaint(); 2<|+h=
&
} du`],/ 6
} d}IVYI
lq+FH&
HCURSOR CCaptureDlg::OnQueryDragIcon() '7wWdq
{ ,AACE7%l
return (HCURSOR) m_hIcon; ^d4#
} ;|}6\=(
OTalR;:]r
void CCaptureDlg::OnCancel() ^Cpvh}1#
{ z\Qg 3BS
if(bTray) 2NI3&;{4
DeleteIcon(); ]<TgBo|
CDialog::OnCancel(); K4A=lD+
} !QP~#a%
oIX]9~
void CCaptureDlg::OnAbout() t'FY*|xk
{ /__we[$E
CAboutDlg dlg; [T !#s
dlg.DoModal(); d;)Im
"
} O"_FfwO
a
~#@sZ0/<
void CCaptureDlg::OnBrowse() \
$z.x-U
{ 3Pkzzyk_|D
CString str; IjJ3./L!5
BROWSEINFO bi; QT^W00h
char name[MAX_PATH]; wnhac}
ZeroMemory(&bi,sizeof(BROWSEINFO)); w^z}!/"]u
bi.hwndOwner=GetSafeHwnd(); #OH# &{H
bi.pszDisplayName=name; 3 uhwoE
bi.lpszTitle="Select folder"; wrw~J
bi.ulFlags=BIF_RETURNONLYFSDIRS; s+o/:rrxY
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0SA
c1
if(idl==NULL) `<C)oF\~f
return; !</5 )B`5:
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "4}{Z)&R2
str.ReleaseBuffer(); d];E99}
m_Path=str; R:Z{,R+
if(str.GetAt(str.GetLength()-1)!='\\') Nn4<:2
m_Path+="\\"; |Pwb7:a3
UpdateData(FALSE); [2.pZB
} UPUO8W)<Z6
C6:<.`iD87
void CCaptureDlg::SaveBmp() WE68a!6
{ >\3=h8zw
CDC dc; OBl-6W
dc.CreateDC("DISPLAY",NULL,NULL,NULL); H2|&
CBitmap bm; t&H) :P
int Width=GetSystemMetrics(SM_CXSCREEN); -=5z&)
X
int Height=GetSystemMetrics(SM_CYSCREEN); D_(xhM
bm.CreateCompatibleBitmap(&dc,Width,Height); j`ggg]"&$
CDC tdc; ^|-x mUC
tdc.CreateCompatibleDC(&dc); ,W7\AY07]
CBitmap*pOld=tdc.SelectObject(&bm); X^r HugQ
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r9z/hm}E
tdc.SelectObject(pOld); ;40!2P8t
BITMAP btm; @kRe0:t
bm.GetBitmap(&btm); jQC6N#L
DWORD size=btm.bmWidthBytes*btm.bmHeight; 4Poi:0oOys
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rh?!f(_@
BITMAPINFOHEADER bih; |j<b?
bih.biBitCount=btm.bmBitsPixel; uZ\ >
bih.biClrImportant=0; N>'1<i?
bih.biClrUsed=0; *ZF7m_8u{
bih.biCompression=0; fQ'P2$
bih.biHeight=btm.bmHeight; #V*<G#B
bih.biPlanes=1; TZ ?va@2
bih.biSize=sizeof(BITMAPINFOHEADER); c_vj't
bih.biSizeImage=size; a]BnHLx
bih.biWidth=btm.bmWidth; D />REC^
bih.biXPelsPerMeter=0; K zKHC
bih.biYPelsPerMeter=0; b.Z K1
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); HG5|h[4Gt
static int filecount=0; 0:Yz'k5
CString name; c7L#f=Ot?
name.Format("pict%04d.bmp",filecount++); s>76?Q:i
name=m_Path+name; Qte=<Z)
BITMAPFILEHEADER bfh; \y"!`.E7\d
bfh.bfReserved1=bfh.bfReserved2=0; TOeJnk
bfh.bfType=((WORD)('M'<< 8)|'B'); c+Ejah+
bfh.bfSize=54+size; `2Ju[P
bfh.bfOffBits=54; w*u HB;?
CFile bf; 8L9xP'[^
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HBV~`0O$
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); a
UAPh
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); sq*d?<:3
bf.WriteHuge(lpData,size); bJmVq%>;
bf.Close(); w}K<,5I>
nCount++; `BdZqXKG
} :|EM1-lwf
GlobalFreePtr(lpData); `6?r.;wj
if(nCount==1) >-c ;
m_Number.Format("%d picture captured.",nCount); v|<Dc8i+
else \[%[`m
m_Number.Format("%d pictures captured.",nCount); /}]X3ng
UpdateData(FALSE); QjVP]C}p
} YFy5>*W
S%R:GZEf_
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xT#j-T
{ %j^[%&pT
if(pMsg -> message == WM_KEYDOWN) @G~T&6E!
{ .3Jggp
if(pMsg -> wParam == VK_ESCAPE) wk<QYLEk
return TRUE; dNB56E)5`J
if(pMsg -> wParam == VK_RETURN) JGHQ_AI
return TRUE; ~^UQw?;
} pMHY2t
return CDialog::PreTranslateMessage(pMsg); V+W,#5
} 1b-4wonQd
s>9w+|6Ji
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #(?EL@5
{ 8Tyf#`'I
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %($sj|_l
SaveBmp(); hIuKs5`
return FALSE; H
:}|UW
} dUk^DI,:l
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %TyR8
%
CMenu pop; X25cU{
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Q
Bc\=}
CMenu*pMenu=pop.GetSubMenu(0); lGwX.cA!'
pMenu->SetDefaultItem(ID_EXITICON); LBk1Qw}-
CPoint pt; 6-{QU] #
GetCursorPos(&pt); RM|<(kq
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >t.2!Z_RQ
if(id==ID_EXITICON) 5lu620o
DeleteIcon(); KcF2}+iM
else if(id==ID_EXIT) Mmq{]q~At
OnCancel(); Ie`kzssM
return FALSE; 5#p [Q _
} ^PMP2\JQA
LRESULT res= CDialog::WindowProc(message, wParam, lParam); s_yY,Z:
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~N&j6wHg#
AddIcon(); |
y\B*P
return res; MS%xOB*6
} Q|rrbx b
^sY ]N77
void CCaptureDlg::AddIcon() Q7gBxp
{ fT!n*;h
NOTIFYICONDATA data; FZ
DC?
data.cbSize=sizeof(NOTIFYICONDATA); nzmv>s&UW
CString tip; w&8gA[y*u
tip.LoadString(IDS_ICONTIP); {n2mh%I
data.hIcon=GetIcon(0); !G.)%+Z
data.hWnd=GetSafeHwnd(); Y .Na9&-(
strcpy(data.szTip,tip); n{J<7I e"*
data.uCallbackMessage=IDM_SHELL; o}mD1q0yE
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;
"<SK=W
data.uID=98; H1N_
Shell_NotifyIcon(NIM_ADD,&data); Edj}\e*-J
ShowWindow(SW_HIDE); \::<]
bTray=TRUE; S\JV96
} Af pB=3
E)|fKds
void CCaptureDlg::DeleteIcon() 2~AGOx
{ 6Daz1Pxd+
NOTIFYICONDATA data; -z)I;R
data.cbSize=sizeof(NOTIFYICONDATA); !n~p?joJ*
data.hWnd=GetSafeHwnd(); 'KMyaEh.u
data.uID=98; {<5rbsqk
Shell_NotifyIcon(NIM_DELETE,&data); uli,@5%\
ShowWindow(SW_SHOW); |XzqP +t
SetForegroundWindow(); n qg=I
ShowWindow(SW_SHOWNORMAL); *q{/`Z{wy
bTray=FALSE; 9]r6V
} ymT&[+V
&ok2Xw
void CCaptureDlg::OnChange() a*o#,T5A
{ }@_F( B
RegisterHotkey(); Ouc=4'$-
} K]yCt~A$
J~9l+?
BOOL CCaptureDlg::RegisterHotkey() yf(VwU,
x
{ ?ntyF-n&
UpdateData(); yeqZPzn
UCHAR mask=0; W6_/FkO
UCHAR key=0; (0g@Z`r
if(m_bControl) YQxVeS(
mask|=4; \74+ cN
if(m_bAlt) zpx
mask|=2; ^P
>; %
if(m_bShift) fn>MOD!l
mask|=1; ,.6Hh'^65^
key=Key_Table[m_Key.GetCurSel()]; UaA6
if(bRegistered){ l 3bo
DeleteHotkey(GetSafeHwnd(),cKey,cMask); BFc=GiPnQ
bRegistered=FALSE; # kl?ww U
} 'kPc`)\
cMask=mask; U@x5cw:
cKey=key; D'2&'7-sm\
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E#X(0(A)
return bRegistered; z@iu$DZ
} l'n"iQ!G
5rK7nLb
四、小结 1nhC! jDD
;0( |06=
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。