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:
\__xTL\
?<efKs 一、实现方法
V~MyX&` gN;
E}AQt 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:
tUT:vK` (i;,D- #pragma data_seg("shareddata")
;Z.sK-NJ4 HHOOK hHook =NULL; //钩子句柄
}U ue}VOA UINT nHookCount =0; //挂接的程序数目
J;*2[o.N static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
3<O=,F static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
jp880} static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Rrw6\iO static int KeyCount =0;
8DkZ@} static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
&t,"k'p #pragma data_seg()
$bFH%EA. ~xt]g zp{ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
"h7Np/ m3 ^H`4BWc DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
p735i`8 t03T1.:(Mg BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
66{Dyn7J~ cKey,UCHAR cMask)
e(H{C {
X:m m<4 BOOL bAdded=FALSE;
oer3DD( for(int index=0;index<MAX_KEY;index++){
ijACfl{!:t if(hCallWnd[index]==0){
+:3s f%0 hCallWnd[index]=hWnd;
=wznkqyhi HotKey[index]=cKey;
yA~1$sA1 HotKeyMask[index]=cMask;
d]vom@iI bAdded=TRUE;
95mwDHbA KeyCount++;
p0Pmmp7r
break;
-,q
qQf }
*:?XbtIK u }
`_e5pW=:> return bAdded;
_0o65?F }
[L=M=;{4 //删除热键
}poLHS/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1v inO! {
"Pl.G[Buc- BOOL bRemoved=FALSE;
U;#G$ for(int index=0;index<MAX_KEY;index++){
($Q|9>5, if(hCallWnd[index]==hWnd){
%?Q< if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
HdRwDW@7= hCallWnd[index]=NULL;
#xh
M&X HotKey[index]=0;
6 apK HotKeyMask[index]=0;
A [_T~+-G bRemoved=TRUE;
xg;vQKS6 KeyCount--;
Ui'*$W]v break;
?OFfU 4 }
vLpIVNA]]Y }
|]eWO#vs }
U>0bgL return bRemoved;
y*!8[wASHq }
{hoe^07XK {wD:!\5 VV"w{#XKw DLL中的钩子函数如下:
1L%$\0B4hm '.]<lh! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
WsW] 1p {
K!(hj '0. BOOL bProcessed=FALSE;
9^E!2CJ if(HC_ACTION==nCode)
^qLesP#
{
vi]cl=S if((lParam&0xc0000000)==0xc0000000){// 有键松开
63QF1*gPH switch(wParam)
vr4{|5M {
CYYo+5x case VK_MENU:
yCwe:58 MaskBits&=~ALTBIT;
b+$E*} break;
jB,VlL case VK_CONTROL:
ko"xR%Q MaskBits&=~CTRLBIT;
a5 pXn v]A break;
gOr%N!5 case VK_SHIFT:
@M6F?; MaskBits&=~SHIFTBIT;
O*yA50Cn break;
h0")NBRV& default: //judge the key and send message
Ro=dgQ0:t break;
,I
H~ }
?3gf)g= for(int index=0;index<MAX_KEY;index++){
\46*4?pP if(hCallWnd[index]==NULL)
cNMDI continue;
u7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
o|w
w>m {
Q]<6voyy SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
#u3E{NB bProcessed=TRUE;
HGF&'@dn }
h-\Ov{~ }
:mhO/Bx }
=s9*=5r 8 else if((lParam&0xc000ffff)==1){ //有键按下
UkcH+0o switch(wParam)
\f7R^;`_<R {
K{:[0oIHc case VK_MENU:
x,HD,VQR/ MaskBits|=ALTBIT;
%CQv&d2 break;
{s{+MbD case VK_CONTROL:
vy-q<6T}:p MaskBits|=CTRLBIT;
N~P1^x~ break;
5> !N)pA case VK_SHIFT:
BS%pS( MaskBits|=SHIFTBIT;
e ^ZY break;
WLiF D. default: //judge the key and send message
^fE8|/]nG9 break;
o5:md :\ }
@|{8/sOq for(int index=0;index<MAX_KEY;index++){
9CAu0N5< if(hCallWnd[index]==NULL)
7rG+)kHG continue;
iUs_)1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0"Zxbgu) {
,y@WFRsx SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
X^rFRk bProcessed=TRUE;
53>(2 _/[r }
<d O~; }
1jE {]/Y7& }
!x!1H5" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
bXA%|7* for(int index=0;index<MAX_KEY;index++){
K"ly\$F if(hCallWnd[index]==NULL)
3p]\l ]= continue;
/qFY$vj if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
p)VMYu SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
E{}J-_oS45 //lParam的意义可看MSDN中WM_KEYDOWN部分
#CcEI }
@d:GtAW }
Gl"hn }
9@}5FoX" return CallNextHookEx( hHook, nCode, wParam, lParam );
y9k'jEZ"oh }
SVObJsB^ % bKy 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:
dKhS;!K9p FAX[|p BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}z,9!{~` BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
nJ$2RN ].sD#~L_ 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:
C-g,uARX(r /1_O5'5+v LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
f:6F5G {
X ka+1c if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
%<8r`BMo {
ev4_}! //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
*9|p}q9n SaveBmp();
9_8\xLk return FALSE;
=R ZPDu }
ZXXJ!9-&+J …… //其它处理及默认处理
g yegdky3 }
Y!+H9R <[w5M?n8 hj{)6dBX% 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。
~NLthZ(O KT+{-"4- 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。
d c/^ RJKi98xwJ
二、编程步骤
R / ND f` A~X\ dcn 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";
f'*/IG g<7Aln}Nl\ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
ia-ht>F*; k~I]Y, 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;
CD5% iFy My Ky*wD 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;
6uKP
BL@, ; 6PRi/@ 5、 添加代码,编译运行程序。
BoOuN94 u~>G8y)k9O 三、程序代码
x-W~&`UU j"fx|6l) ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
unKl5A[h #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
!\'H{,G #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
%3AE2" #if _MSC_VER > 1000
pvb&vtp #pragma once
1.PN_9% #endif // _MSC_VER > 1000
5g
O9 < #ifndef __AFXWIN_H__
0*+EYnu+ #error include 'stdafx.h' before including this file for PCH
HF"TS* #endif
IP@3R(DS% #include "resource.h" // main symbols
U$3DIJVI class CHookApp : public CWinApp
#`!mQSK {
agE-, public:
|=KzQY|u CHookApp();
587;2 // Overrides
#Ma:Av/
) // ClassWizard generated virtual function overrides
=F}qT|K //{{AFX_VIRTUAL(CHookApp)
sI h5cT public:
UFu0{rY_ virtual BOOL InitInstance();
u&[L!w virtual int ExitInstance();
9
W|'~r //}}AFX_VIRTUAL
bfm+!9=9S //{{AFX_MSG(CHookApp)
cB36w$n8 // NOTE - the ClassWizard will add and remove member functions here.
"K$c 9Z8 // DO NOT EDIT what you see in these blocks of generated code !
{qU;;`P]| //}}AFX_MSG
"C(yuVK1G DECLARE_MESSAGE_MAP()
Lusd kc7 };
ofw&?Sk0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
<mj/P|P@ BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}q'IY:r BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
U OGjil{. BOOL InitHotkey();
9Kgyt BOOL UnInit();
*SIYZE' #endif
Vh2uzG >B=s+}/ME //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
7l[@c|e #include "stdafx.h"
i$`o,m# #include "hook.h"
ZJc{P5a1J #include <windowsx.h>
H9i7y,[* #ifdef _DEBUG
5j$&Zgx51 #define new DEBUG_NEW
r!O[|h #undef THIS_FILE
BFhEDkk static char THIS_FILE[] = __FILE__;
"A&A?% #endif
\13Q >iAu #define MAX_KEY 100
7Z~JuTIZ #define CTRLBIT 0x04
"\T-r 2 #define ALTBIT 0x02
V6'u\Ch| #define SHIFTBIT 0x01
/U0Hk>$~( #pragma data_seg("shareddata")
|)" y HHOOK hHook =NULL;
ryw%0H18 UINT nHookCount =0;
!#WQ8s!?o static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
g5"I{ol5T~ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
TJZ/lJU static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
UNwjx7usD static int KeyCount =0;
!8T04988j static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
B|yz~wuS #pragma data_seg()
_+nk3-yQw HINSTANCE hins;
v\MQ?VC void VerifyWindow();
NZ&ZK@h}. BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
ao=e{R) //{{AFX_MSG_MAP(CHookApp)
x?lRObHK // NOTE - the ClassWizard will add and remove mapping macros here.
WT")tjVKA // DO NOT EDIT what you see in these blocks of generated code!
_|cSXZ| //}}AFX_MSG_MAP
4o;;'P END_MESSAGE_MAP()
<DPRQhNW] jkta]#O CHookApp::CHookApp()
TC44*BHq {
B!;:,(S~ // TODO: add construction code here,
7SH3k=x // Place all significant initialization in InitInstance
%'_:#!9 }
; %(sbA &0\:MJc CHookApp theApp;
0#Pa;( LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
.VNz(s {
SZLugyZ2Y BOOL bProcessed=FALSE;
?e4H{Y/M if(HC_ACTION==nCode)
U`8Er48X {
WagL8BpLx if((lParam&0xc0000000)==0xc0000000){// Key up
doe3V-if switch(wParam)
` OgT"FdL! {
<#57q% case VK_MENU:
T3<1{"& MaskBits&=~ALTBIT;
CGlEc break;
O(2c_! d case VK_CONTROL:
]0 = |?n$7 MaskBits&=~CTRLBIT;
o<txm ?+N break;
[KHlApL case VK_SHIFT:
QV HI}3~ MaskBits&=~SHIFTBIT;
='w 2"4 break;
?u?mSO/ default: //judge the key and send message
'J-a2oiM( break;
#NGtba }
7&wxnxSk^ for(int index=0;index<MAX_KEY;index++){
WcS`T?Xa if(hCallWnd[index]==NULL)
d4ld-y continue;
tKcC{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
G4P*U3&p {
\'[tfSB SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Ii5U)" bProcessed=TRUE;
[7HBn }
!.q99DB }
hcRe,}wJ }
jP_s(PQ else if((lParam&0xc000ffff)==1){ //Key down
~_"V7 switch(wParam)
8 @(?E[&O> {
@_$$'XA7 case VK_MENU:
lF.kAEC MaskBits|=ALTBIT;
V!Sm,S( break;
3{t[>O; case VK_CONTROL:
_deEs5i MaskBits|=CTRLBIT;
X$1YvYsID break;
~|Ln9f-g case VK_SHIFT:
fe`_0lxj MaskBits|=SHIFTBIT;
_[rQt8zn break;
dQ-shfTr] default: //judge the key and send message
j$XaO%y) break;
v=hn# U }
60$;Q,]o for(int index=0;index<MAX_KEY;index++)
_h \L6. {
[kqtkgK$j2 if(hCallWnd[index]==NULL)
[q3zs_nz continue;
$RRX- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}N(gP_?n {
%Cqp88] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
);JWrkpz bProcessed=TRUE;
Qc?W;Q+ }
p%sizn }
yp^k;G?_d }
Iy4%,8C]g if(!bProcessed){
1P1h);*Z for(int index=0;index<MAX_KEY;index++){
EmrkaV-?k if(hCallWnd[index]==NULL)
LL
(TD& continue;
W^xO/xu1/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[xrsa!$ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
7}~w9jK"F }
[
't.x= }
yhbU;qEG9 }
N\Lu+ x5 return CallNextHookEx( hHook, nCode, wParam, lParam );
PX/{!_mM }
7=u
Gf$/ +^esL9RG: BOOL InitHotkey()
{D..(f1*u {
Ri_2@U- if(hHook!=NULL){
z#PaQp5F nHookCount++;
ru 9@|FgAE return TRUE;
NQ[X=a8N }
ty#6% else
P*7G? hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
YZ8[h`z if(hHook!=NULL)
Q4LPi;{\ nHookCount++;
YG8C<g6E7 return (hHook!=NULL);
(tVT&eO }
[:gg3Qzx BOOL UnInit()
{5X,xdzR {
_4L6 if(nHookCount>1){
5fiWo^s} nHookCount--;
bQq/~ return TRUE;
Kx)PK }
LS9,:!$ BOOL unhooked = UnhookWindowsHookEx(hHook);
I}|a7,8 if(unhooked==TRUE){
*VJ ISJC nHookCount=0;
iEr?s-or hHook=NULL;
ilJ`_QN }
0k16f3uI
return unhooked;
*<67h*|) }
>2pxl(i -2[4 @ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
BgT ^ {
S#8)N` BOOL bAdded=FALSE;
D QxuV1 for(int index=0;index<MAX_KEY;index++){
7rRI-wZ if(hCallWnd[index]==0){
1_f+!
ns# hCallWnd[index]=hWnd;
Udtz zka HotKey[index]=cKey;
ElB[k< HotKeyMask[index]=cMask;
c"lwFr9x7 bAdded=TRUE;
T"za|Fo KeyCount++;
U_PH#e break;
i6n,N)%H }
F09%f"9 }
"h[)5V{ return bAdded;
1`L.$T,1! }
$"|r7n5[ m^qFaf)6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
K`9~#Zx$ {
=_C&lc" BOOL bRemoved=FALSE;
5j ]!r for(int index=0;index<MAX_KEY;index++){
O<L=N- if(hCallWnd[index]==hWnd){
U*Y]cohh if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2/V%jS[4#y hCallWnd[index]=NULL;
|T/OOIA=sI HotKey[index]=0;
a5ZXrWv HotKeyMask[index]=0;
9XDSL[[ bRemoved=TRUE;
x X3I` KeyCount--;
Q[NoFZ
V! break;
~>9G\/u j }
bK0(c1*a[e }
jR[c3EA
; }
&a=rJvnIO& return bRemoved;
8+gp"!E }
j?|Vx' w8Z#]kRv void VerifyWindow()
`3VI9GmQ {
<2 [vR|Q* for(int i=0;i<MAX_KEY;i++){
]nRf%Vi8g if(hCallWnd
!=NULL){ 57;0,k5Gy
if(!IsWindow(hCallWnd)){ 5,^DT15a4P
hCallWnd=NULL; G,?a8(
HotKey=0; 59j`Z^e
HotKeyMask=0; {p/Yz#
KeyCount--; +kYp!00
} ]k]bLyz\J
} B1~`*~@
} K*DH_\SPK
} \ Xh
C
)6p6<y
BOOL CHookApp::InitInstance() "k @[7
7
{ Pi?G:IF
AFX_MANAGE_STATE(AfxGetStaticModuleState()); U7n#TPet
hins=AfxGetInstanceHandle(); +3zQ"lLD^
InitHotkey(); [DeDU:
return CWinApp::InitInstance(); Ty{
SZUJ
} fm^`
VUUnB<j
int CHookApp::ExitInstance() PH8
88O
{ nZ'jj S[!
VerifyWindow(); Nk\ni>Du3
UnInit(); H#YI7l2
return CWinApp::ExitInstance(); /"A=Yf
} ai?J
2Ul8<${c{
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file EHf,VIC8
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V~/@KU8cH
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ '9.@r\g
#if _MSC_VER > 1000 M"s:*c_6
#pragma once iOv>g-t:
#endif // _MSC_VER > 1000 =e# h;x2
n]4Elrxx
class CCaptureDlg : public CDialog (#>X*~6
{ FywX
// Construction O-p`9(_m
public: DN=W2MEfc
BOOL bTray; =kwz3Wv
BOOL bRegistered; w$iPFZC'
BOOL RegisterHotkey(); :qj^RcmVPL
UCHAR cKey; ydO G8EI
UCHAR cMask; Oj%5FUP~[%
void DeleteIcon(); 'Y
,2CN
void AddIcon(); x5PM]~"p
UINT nCount; s92ol0`
void SaveBmp(); 9Ca0Tu
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7DK}c]js
// Dialog Data tpA-IL?KQw
//{{AFX_DATA(CCaptureDlg) ~Y~M}4
enum { IDD = IDD_CAPTURE_DIALOG }; aizws[C
CComboBox m_Key; }[!=O+gO
BOOL m_bControl; 0%&}w UjV
BOOL m_bAlt; A*+gWn,4Y_
BOOL m_bShift; (c}!gjm
CString m_Path; yLCMu | +
CString m_Number; d42Y` Wu
//}}AFX_DATA \/ri|fm6l#
// ClassWizard generated virtual function overrides DS%]7,g]
//{{AFX_VIRTUAL(CCaptureDlg) .7Yox1,
public: 5({_2meJ:
virtual BOOL PreTranslateMessage(MSG* pMsg); X8*~Cf73u
protected: F~rl24F
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l{^s4
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >JA-G@3i
//}}AFX_VIRTUAL |LLpG37_
// Implementation |dHtv 6I
protected: 9wf"5c
HICON m_hIcon; ZZHQ?p-
// Generated message map functions Tzjv-9^V
//{{AFX_MSG(CCaptureDlg) 0wTOdCvmb
virtual BOOL OnInitDialog(); G!C }ULq
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H-e$~vEbP
afx_msg void OnPaint(); Z VdQ$
afx_msg HCURSOR OnQueryDragIcon(); a"O;DYh
virtual void OnCancel(); p]y.N)a
afx_msg void OnAbout(); SfY 5Xgp
afx_msg void OnBrowse(); 32aI0CT
afx_msg void OnChange(); R87@.
//}}AFX_MSG H2[0@|<<
DECLARE_MESSAGE_MAP() fH9"sBiO
}; Ex]Ku
#endif xuqG)HthRS
w1zMY:9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #M!{D
#include "stdafx.h" <{ v
%2
#include "Capture.h" &|'yqzS3
#include "CaptureDlg.h" Mby4(M+&n
#include <windowsx.h> uR2|> m
#pragma comment(lib,"hook.lib") ^uw]/H3?L
#ifdef _DEBUG bnvY2-O6
#define new DEBUG_NEW 1D[>oK\
#undef THIS_FILE &CXk=Wj
static char THIS_FILE[] = __FILE__; t&x\@p9
#endif /L(}VJg-
#define IDM_SHELL WM_USER+1 +]wM$bP
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =Sr<d|\O
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]FvGAG.*
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "B +F6
class CAboutDlg : public CDialog Pz
D30VA
{ QAo/d4
public: u~FVI
CAboutDlg(); Oop6o$k
// Dialog Data wmR~e
//{{AFX_DATA(CAboutDlg) ^ @=4HtA
enum { IDD = IDD_ABOUTBOX }; lqrI*@>Tz
//}}AFX_DATA ,1CmB@
// ClassWizard generated virtual function overrides b$nev[`{6
//{{AFX_VIRTUAL(CAboutDlg) SQ+r'g
protected: =tA;JB
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~9k E.
//}}AFX_VIRTUAL ^ ~1QA
// Implementation s%vy^x29
protected: ui`EODhA(
//{{AFX_MSG(CAboutDlg) "D4% A!i
//}}AFX_MSG (s|WmSQ
DECLARE_MESSAGE_MAP() x7gd6"10^
}; (w"(RM~
WQ:Y NmQ1p
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GZx*A S]+
{ UNv!G/i-5
//{{AFX_DATA_INIT(CAboutDlg) /7+b.h])^
//}}AFX_DATA_INIT =\ 5f_g2M
} G[u6X_Q
yEh{9S%6p
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ndN*X'
{ >hG*=4oh
CDialog::DoDataExchange(pDX); hiV!/}'7
//{{AFX_DATA_MAP(CAboutDlg) }{,Wha5\n
//}}AFX_DATA_MAP
(igB'S5wf
} >fT%CGLC0
X6t9*|C
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) KMqGWO*
//{{AFX_MSG_MAP(CAboutDlg) !vK0|eV3
// No message handlers >6WZSw/Hq
//}}AFX_MSG_MAP B2LXF3#/
END_MESSAGE_MAP() y|0/;SjV
Q3bU"f
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) WL,2<[)Ew
: CDialog(CCaptureDlg::IDD, pParent) c8Q2H
{ w<]-~`K
//{{AFX_DATA_INIT(CCaptureDlg) 1!U:M8T|
m_bControl = FALSE; jyyig%
m_bAlt = FALSE;
- 3PLP$P
m_bShift = FALSE; ([rSYKpi
m_Path = _T("c:\\"); <:nyRy}
m_Number = _T("0 picture captured."); HFyQ$pbBU
nCount=0; !OPHS^L
bRegistered=FALSE; %yfl-c(u
bTray=FALSE; b *0u xvLu
//}}AFX_DATA_INIT !:esdJH
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L0=`1q
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LLzxCMc9*
} UpSJ%%.n
!5[SNr3^
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /$\8?<Pc".
{ 6;!)^b
CDialog::DoDataExchange(pDX); #s>'IPc0
//{{AFX_DATA_MAP(CCaptureDlg) jRDvVV/-wr
DDX_Control(pDX, IDC_KEY, m_Key); %{^|Av1Uz
DDX_Check(pDX, IDC_CONTROL, m_bControl); R/E6n &R
DDX_Check(pDX, IDC_ALT, m_bAlt); \x4:i\Fx@
DDX_Check(pDX, IDC_SHIFT, m_bShift); D Vg$rm`
DDX_Text(pDX, IDC_PATH, m_Path); ?Oy0p8
DDX_Text(pDX, IDC_NUMBER, m_Number); W
9}xfy09
//}}AFX_DATA_MAP cud9oJ-=;
} 7D 3-/_ v
>/}p{Tj
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) s!MD8ia
//{{AFX_MSG_MAP(CCaptureDlg) kj4=Q\Rfm
ON_WM_SYSCOMMAND() 5X5UUdTM
ON_WM_PAINT() @y * TVy
ON_WM_QUERYDRAGICON() `*kl> }$
ON_BN_CLICKED(ID_ABOUT, OnAbout) H=Cj/jE
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) N6+^}2'*)
ON_BN_CLICKED(ID_CHANGE, OnChange) Y8lZ]IB
//}}AFX_MSG_MAP SH8zkAA7u}
END_MESSAGE_MAP() 8s[1-l
-lv(@7o~
BOOL CCaptureDlg::OnInitDialog() $XkO\6kh
{ gyh8
CDialog::OnInitDialog(); V=1zk-XC
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jr#*;go
ASSERT(IDM_ABOUTBOX < 0xF000); E&@#*~
CMenu* pSysMenu = GetSystemMenu(FALSE); <_=O0 t|6
if (pSysMenu != NULL) c1y+kvv
{ b<"jmB{
CString strAboutMenu; WMWMb3
strAboutMenu.LoadString(IDS_ABOUTBOX); QSM3qke
if (!strAboutMenu.IsEmpty()) R(P(G;#j
{ 0sme0"Sl
pSysMenu->AppendMenu(MF_SEPARATOR); #QSSpsF@
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Sx0{]1J
} @k'V`ZQF
} ^f"|<r
SetIcon(m_hIcon, TRUE); // Set big icon TVSCjI
SetIcon(m_hIcon, FALSE); // Set small icon Ux= B*m1@{
m_Key.SetCurSel(0); 0mmHN`<
RegisterHotkey(); gnxD'1_
CMenu* pMenu=GetSystemMenu(FALSE); r[GH#vF;7
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _X=6M
gU
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zA3r&stN+
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IQ-l%x[fue
return TRUE; // return TRUE unless you set the focus to a control asmu<
} Lg#(?tMp,'
{7%HK2='
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \\Q){\S
{ 3=Rk(%:;
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5e7\tBab
{ Q%J,:J
CAboutDlg dlgAbout; S}]B |Q
dlgAbout.DoModal(); OZ"76|H1`
} !g=b=YK
else s&$e}yxVO
{ Zv-1*hhHf
CDialog::OnSysCommand(nID, lParam); jWh)bsqI!
} !)W#|sys&
} ]Ge>S?u
ryA+Lli.
void CCaptureDlg::OnPaint() |68/FJZ,5
{ -O-?hsV)y
if (IsIconic()) g4 +Hq *
{ .ns=jp
CPaintDC dc(this); // device context for painting B8.}9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); a+a6P5kJ
// Center icon in client rectangle /nX_Q?mo
int cxIcon = GetSystemMetrics(SM_CXICON); IX<9_q
int cyIcon = GetSystemMetrics(SM_CYICON); :7dc;WdM
CRect rect; ^L7!lzyo
GetClientRect(&rect); &1`Y&x:p
int x = (rect.Width() - cxIcon + 1) / 2; A 2A_F|f
int y = (rect.Height() - cyIcon + 1) / 2; v.u 5%
// Draw the icon e+VE FWz
dc.DrawIcon(x, y, m_hIcon); h9iQn<lp4.
} R?- zJ ;
else cN&:V2,
{ C|3cQ{
CDialog::OnPaint(); ZBN,%P!P0
} +Kg }R5+
} BD86t[${W
asLrXGGyT
HCURSOR CCaptureDlg::OnQueryDragIcon() |R!ozlL{}
{ k9:|CEP
return (HCURSOR) m_hIcon; 49}WJC7
)
} lB_X mI1t
~82 {Y
_{/
void CCaptureDlg::OnCancel() T3 4Z#PFwe
{ oj)(.X<8N
if(bTray) N#$]W"U
DeleteIcon(); PCV#O63[
CDialog::OnCancel(); Q&^\YgkCf
} &%qDi_UD
Tm7LaM
void CCaptureDlg::OnAbout() MEp{v|1
{ b0@K ~O;g
CAboutDlg dlg;
gwXmoM5
dlg.DoModal(); bw7g L\*
} u7Ix7`V
?.lo[X<,*
void CCaptureDlg::OnBrowse() KtH^k&z.f
{ qK9A
/Mc
CString str; k%kEW%I yG
BROWSEINFO bi; 'd&4MA 0X
char name[MAX_PATH]; |3Oyg ?2
ZeroMemory(&bi,sizeof(BROWSEINFO)); t imY0fx#
bi.hwndOwner=GetSafeHwnd(); yx:+Xy*N
bi.pszDisplayName=name; Y5;afU='
bi.lpszTitle="Select folder"; w9O!L9 6
bi.ulFlags=BIF_RETURNONLYFSDIRS; >gM"*Laa?
LPITEMIDLIST idl=SHBrowseForFolder(&bi); `8Ych@f]
if(idl==NULL) uwZ,l-6T
return; <o*b6m%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6-J}ZfGj
str.ReleaseBuffer(); y'>JT/Q5
m_Path=str; o8hE.pf&
if(str.GetAt(str.GetLength()-1)!='\\') 6?C';1
m_Path+="\\"; dG]B-(WTC
UpdateData(FALSE); ?K:.Pa
} c=9A d
&1&OXm$
void CCaptureDlg::SaveBmp() ^yq}>_
{ vNl)ltzJF
CDC dc; dga4|7-MY
dc.CreateDC("DISPLAY",NULL,NULL,NULL); BGwD{6`U
CBitmap bm;
kN8B,
int Width=GetSystemMetrics(SM_CXSCREEN); ?TK`s Gy
int Height=GetSystemMetrics(SM_CYSCREEN); X!'C'3 X
bm.CreateCompatibleBitmap(&dc,Width,Height); t,*1=S5
CDC tdc; )|k#cT{=M
tdc.CreateCompatibleDC(&dc); UwF-*(#41
CBitmap*pOld=tdc.SelectObject(&bm); .QwB7+V4
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I.T?A9Z
tdc.SelectObject(pOld); DG0I-"s
BITMAP btm; !cM<&3/
bm.GetBitmap(&btm); "19#{yX4
DWORD size=btm.bmWidthBytes*btm.bmHeight; *FZav2]-
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4#]g852
BITMAPINFOHEADER bih; M6^
\LtFt
bih.biBitCount=btm.bmBitsPixel; cL;%2TMk
bih.biClrImportant=0; HX}B#T
bih.biClrUsed=0; 3;> z %{
bih.biCompression=0; ]j6K3
bih.biHeight=btm.bmHeight; )cZHBG.0H
bih.biPlanes=1; .>.GQUr
bih.biSize=sizeof(BITMAPINFOHEADER); #=33TvprR2
bih.biSizeImage=size; G +41D
bih.biWidth=btm.bmWidth; bj6Yz,g F
bih.biXPelsPerMeter=0; }Bsh!3D<.
bih.biYPelsPerMeter=0; #)twk`!^
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d
ePk}Sn
static int filecount=0; U=69q]
CString name; B7|%N=S%/
name.Format("pict%04d.bmp",filecount++); <j,3Dn
name=m_Path+name; e.%I#rNI
BITMAPFILEHEADER bfh; &ni#(
bfh.bfReserved1=bfh.bfReserved2=0; WG,1%=M@
bfh.bfType=((WORD)('M'<< 8)|'B'); ^,AE;ZT7
bfh.bfSize=54+size; Q@>1z*'I
bfh.bfOffBits=54; C<I?4WM
CFile bf; -$0}rfX
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1r}i[5
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U1E@pDH
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v{uq
bf.WriteHuge(lpData,size); 2rf8)8':
bf.Close(); n8_X<jIp3
nCount++; =N{?ll6x7g
} *i:8g(
GlobalFreePtr(lpData); l>pB\<LL
if(nCount==1) xRhGBb{@s
m_Number.Format("%d picture captured.",nCount); oq!\100
else K\XQE50
m_Number.Format("%d pictures captured.",nCount); F~
\ONO5
UpdateData(FALSE); hif;atO
} ?Fny_{&^H
ort*Ux)
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) CsycR @[
{ ?YZgH>7"
if(pMsg -> message == WM_KEYDOWN) #0uu19+}
{ "RK"Pn+
if(pMsg -> wParam == VK_ESCAPE) Mog [,{w
return TRUE; C,W_0=!e
if(pMsg -> wParam == VK_RETURN) A:GqR;;"x>
return TRUE; HJ]e%og
} vN],9q
return CDialog::PreTranslateMessage(pMsg); rg
k1.0U0
} "#7Q}d!x
f77W{T4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L/-SWid)
{ @<pd@Mpf]
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R8u8jG(4
SaveBmp();
aY(s
&
return FALSE; DT>`.y%2W
} F9K`N8wlu
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iv6G9e{cx
CMenu pop; gWa0x-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); jy5[K.
CMenu*pMenu=pop.GetSubMenu(0); %H"
pMenu->SetDefaultItem(ID_EXITICON); 5CN=a2&
CPoint pt; C=q&S6/+
GetCursorPos(&pt); h'=)dFw7
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); { >izfG,\
if(id==ID_EXITICON) \i//Aq
DeleteIcon(); 8w:mL^6x
else if(id==ID_EXIT) mhhc}dS(H
OnCancel(); 8~-TN1H
return FALSE; 3))R91I
} Ua
6O~,\
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;7?oJH;
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) H,w8+vZ4\
AddIcon(); wZ\93W-}
return res; X;6;v]
} #xu1
eX0<
=0Y0o_
void CCaptureDlg::AddIcon() \:1$E[3v
{ sfw*_}y
NOTIFYICONDATA data; x,10o
data.cbSize=sizeof(NOTIFYICONDATA); &`n:AR`
CString tip; p19(>|$J
tip.LoadString(IDS_ICONTIP); .$x}~Sw
data.hIcon=GetIcon(0); 9v*y&V9/
data.hWnd=GetSafeHwnd(); JluA?B7E
strcpy(data.szTip,tip); Tr:@Dv.O
data.uCallbackMessage=IDM_SHELL; oYf+I
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; juWXB+d2Y
data.uID=98; p qpsa'
Shell_NotifyIcon(NIM_ADD,&data); jFe8s@7
ShowWindow(SW_HIDE); vvxD}p=y
bTray=TRUE; Lv/}&'\(
} u;rmqo1
RS}_cm0
void CCaptureDlg::DeleteIcon() L3wj vq^
{ ]oSx]R>{f
NOTIFYICONDATA data; YQd($
data.cbSize=sizeof(NOTIFYICONDATA); wk8fa
data.hWnd=GetSafeHwnd(); S>(x x"Ia
data.uID=98; FO^6c
Shell_NotifyIcon(NIM_DELETE,&data); 4C_1wk('
ShowWindow(SW_SHOW); 5!Y\STn
SetForegroundWindow(); Wc+(xk
ShowWindow(SW_SHOWNORMAL);
gvo98Id
bTray=FALSE; NR_3nt^h
} GiuE\J9i
(EWGX |QA
void CCaptureDlg::OnChange() E`^D9:3:)
{ 45.g ;
RegisterHotkey(); ZZ^A&%E(a
} `^8mGR>OpI
af>i
BOOL CCaptureDlg::RegisterHotkey() L,#YP#O,j
{ rqN+0CT
UpdateData(); |z_Dw$-xm
UCHAR mask=0; 5 cQ]vb
UCHAR key=0; v}t{*P
if(m_bControl) 4+d(d
mask|=4; @aUNyyVP
if(m_bAlt) F1$XUos9
mask|=2; ,WOCG2h
if(m_bShift) {{P 3Z[
mask|=1; =#9#unvE!
key=Key_Table[m_Key.GetCurSel()]; qG
20
if(bRegistered){ }#e=*8F7
DeleteHotkey(GetSafeHwnd(),cKey,cMask); _^b\#Jz4U3
bRegistered=FALSE; ]O:8o<0
} z-We>KX
cMask=mask; "OI$PLK
cKey=key; >E4,zs@7t
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |iBf6smF
return bRegistered; CT|0KB&
} UQh.o
8h|} Q _
四、小结 (&Q!5{$W
y,&[OrCm^\
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。