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:
p:,Y6[gMo
d{
(,Gy>I 一、实现方法
eh#37*- yI w}n67 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:
=O/Bte. I8F+Z #pragma data_seg("shareddata")
]!UYl HHOOK hHook =NULL; //钩子句柄
e4X
df>B UINT nHookCount =0; //挂接的程序数目
N&8TG static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
lwnO static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
}ze+ tf static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
wak 26W>I3 static int KeyCount =0;
G#iQX` static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
A#uU]S #pragma data_seg()
,RP-)j"Wff gfk)`>E 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。
c,UJ uCZ ?0b-fL^^+l 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:
r4.6W[|d T&U}}iWN BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
KaIKb=4L| cKey,UCHAR cMask)
V>$( N/1 {
91
jRIB BOOL bAdded=FALSE;
Xo^8o0xi for(int index=0;index<MAX_KEY;index++){
AXfU$~ if(hCallWnd[index]==0){
}v1wpv/b( hCallWnd[index]=hWnd;
>DL HotKey[index]=cKey;
5s7BUT HotKeyMask[index]=cMask;
CB7dr&> bAdded=TRUE;
*[MWvs:, KeyCount++;
rK~-Wzwu break;
|9@,ri\'Rg }
0SpB2>_ }
AZ:7_4jz return bAdded;
n
`j._G
}
~{x1/eH //删除热键
~C-Sr@ a?/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
IQQv+af5 {
:XKYfc_y BOOL bRemoved=FALSE;
~G@NWF?7 for(int index=0;index<MAX_KEY;index++){
[%IOB/{N if(hCallWnd[index]==hWnd){
Pz]WT1J0 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
yUoR6w hCallWnd[index]=NULL;
sYTz6- HotKey[index]=0;
lR(9;3 HotKeyMask[index]=0;
=4ygbk bRemoved=TRUE;
*MJm: KeyCount--;
l\U
Q2i break;
37bMe@W }
Iil2R}1 }
_S!^=9bJ }
#-az]s|N return bRemoved;
J%|?[{rO{' }
U }2@ 7T[~~V^x HC0juT OiO DLL中的钩子函数如下:
0JR/V68$ ~$!,-r LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
UhB+c {
?7\V)$00(& BOOL bProcessed=FALSE;
E4#{&sRT if(HC_ACTION==nCode)
\0@DOW22C {
=g% L$b<i if((lParam&0xc0000000)==0xc0000000){// 有键松开
ZvY"yl?e switch(wParam)
,%i
Scr,z {
[i.@q}c~E case VK_MENU:
vrn4yHoZ MaskBits&=~ALTBIT;
+in)(a. break;
?pL|eS7 case VK_CONTROL:
+Z#=z,.^ MaskBits&=~CTRLBIT;
K5>3 break;
eAHY/Y! case VK_SHIFT:
31n"w; MaskBits&=~SHIFTBIT;
vE ]ge break;
8)B{x[?| default: //judge the key and send message
Za.}bR6?Y break;
H`[FC|RYyE }
|$.?(FZYu for(int index=0;index<MAX_KEY;index++){
h'ik3mLH if(hCallWnd[index]==NULL)
=D zrM% continue;
b,~'wm8:A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
IRW0.'Dn {
;W0J SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
:kZ]Swi 5 bProcessed=TRUE;
*h^->+0n }
hvt]VC]] }
tqZ91QpW }
s/1r{;q else if((lParam&0xc000ffff)==1){ //有键按下
88Pt"[{1 switch(wParam)
YznL+TD {
@Z]0c=-+ case VK_MENU:
bR`5g MaskBits|=ALTBIT;
-]%EX:bm break;
_JH.&8 case VK_CONTROL:
b:1B
> MaskBits|=CTRLBIT;
5nPvEN/ break;
hB?#b`i^ case VK_SHIFT:
;NP-tA) MaskBits|=SHIFTBIT;
C&O8fNB_ break;
)Rr6@o default: //judge the key and send message
E2hsSqsu=
break;
+Q&l}2 }
@`.4"*@M for(int index=0;index<MAX_KEY;index++){
0+&WIs if(hCallWnd[index]==NULL)
O"9t,B>=i continue;
zJ`u>:*$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
r*HSi.'21 {
cT(nKHL SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
qw+7.h#V bProcessed=TRUE;
YB*)&@yx }
|:)Bo<8 }
W83d$4\d }
HB9"T5Pd* if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
&0 QUObK for(int index=0;index<MAX_KEY;index++){
V``|<`!gd if(hCallWnd[index]==NULL)
?!ap@)9 continue;
Ust +g4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
x1=`Z@^ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U<6)CW1; //lParam的意义可看MSDN中WM_KEYDOWN部分
!&%KJS6p4 }
RqROl!6 }
<h(AJX7wsD }
?MDo. z3 return CallNextHookEx( hHook, nCode, wParam, lParam );
%/eG{oh- }
p5In9s e`Yj}i*bx] 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
h!B{7J >A )Sl' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
.)*&NY!nsl BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
AyJl:aN^ ~HY)$Yp; 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_-g|ukC +5fB?0D; LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
F%L"Q>aHW {
/{R
^J# if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
DzC`yWstP {
q~>!_q]FE //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
=K@LEZZ'/< SaveBmp();
gd[muR ~ return FALSE;
WjBml'^RY }
CfOyHhhKX …… //其它处理及默认处理
X8}r= K~ }
l(Y32]Z THl:>s fD%/]`y 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。
J5b3r1~D"[ Y1o[|ytW 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。
QXI~Toddj J
rK{MhO 二、编程步骤
dC<%D'L* hGFi|9/-u 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";
<\*)YKjn/@ =Vh]{y~$ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
OL1xxzo *wAX&+); 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;
E[hSL#0 7]@M 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;
u%L6@M2 Wz^;:6F 5、 添加代码,编译运行程序。
%2RXrH2&H mAH7;u< 三、程序代码
Gb2|e.z hz bvR~rn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Ob%iZ.D|3< #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
[voc_o7AI #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
bLTX_
R #if _MSC_VER > 1000
W'Gh:73'} #pragma once
0MT?}D&TL #endif // _MSC_VER > 1000
=ZHN]PP #ifndef __AFXWIN_H__
yI=nu53BV #error include 'stdafx.h' before including this file for PCH
s"7FmJ\7rw #endif
*K>2B99TXu #include "resource.h" // main symbols
iMry0z class CHookApp : public CWinApp
|
{zka.sJ
{
z:UkMn[ public:
E;yr46 CHookApp();
2w8YtM3+"z // Overrides
j % MY6" // ClassWizard generated virtual function overrides
oe6Ex5h //{{AFX_VIRTUAL(CHookApp)
[/ CB1//Y public:
!d0$cF): virtual BOOL InitInstance();
~#EXb?#uS virtual int ExitInstance();
0"-H34M<D //}}AFX_VIRTUAL
1`II%mf[ //{{AFX_MSG(CHookApp)
i Q3wi // NOTE - the ClassWizard will add and remove member functions here.
PazWMmI // DO NOT EDIT what you see in these blocks of generated code !
:z?T/9,C //}}AFX_MSG
?n<sN" DECLARE_MESSAGE_MAP()
w8>lWgN };
d*!H&1L LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
I9TNUZq(' BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
=PU@'OG BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
GDj_+G;tO\ BOOL InitHotkey();
yyPj!<.MGP BOOL UnInit();
9U9ghWH8 #endif
h1)+QLI ")boY/ P/w //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
q89yW)XG #include "stdafx.h"
7F~Jz*,B*W #include "hook.h"
vr>J$(F #include <windowsx.h>
823y; #ifdef _DEBUG
)`=N+k] #define new DEBUG_NEW
Q2|6W E #undef THIS_FILE
|rpMwkR static char THIS_FILE[] = __FILE__;
_ru<1n[4~ #endif
'o_ RC{k2" #define MAX_KEY 100
%[,^2s #define CTRLBIT 0x04
O[ans_8 #define ALTBIT 0x02
?`*`A9@ #define SHIFTBIT 0x01
4/o9K*M+ #pragma data_seg("shareddata")
54JI/!a HHOOK hHook =NULL;
TR?jT
U UINT nHookCount =0;
B_r:da CS: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
G4F~V't static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
#.j:P# static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
EY1L5Ba. static int KeyCount =0;
LGy!{c static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
xAsy07J? #pragma data_seg()
.<P@6Jq HINSTANCE hins;
;?o"{mbb void VerifyWindow();
c1]\.s BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
IxP$lx //{{AFX_MSG_MAP(CHookApp)
j{5oXW // NOTE - the ClassWizard will add and remove mapping macros here.
XF4NRs // DO NOT EDIT what you see in these blocks of generated code!
d[(%5pw~zL //}}AFX_MSG_MAP
-mZ{.\9 END_MESSAGE_MAP()
H]lD*3b a
8jG')zg CHookApp::CHookApp()
]sI{+$~:c {
BD ,3JDqT // TODO: add construction code here,
51%<N\>/4 // Place all significant initialization in InitInstance
"MT{t>< }
m<9W# =66,$~g{ CHookApp theApp;
]o8~b- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
`O=LQ m` {
M+Y^ A7 BOOL bProcessed=FALSE;
Z*5]qh2r8 if(HC_ACTION==nCode)
"%t !+E>nr {
g.EKdvY"%H if((lParam&0xc0000000)==0xc0000000){// Key up
1 pzd switch(wParam)
?y{"OuRf. {
H~qY7t case VK_MENU:
:n?}G0y MaskBits&=~ALTBIT;
%8L5uMx break;
;UjP0z case VK_CONTROL:
RA62Z&W3 MaskBits&=~CTRLBIT;
XG6UV(' break;
7w"YCRKh case VK_SHIFT:
{'
|yb MaskBits&=~SHIFTBIT;
T|nN. break;
[TpW$E0H default: //judge the key and send message
#lm1"~`5 break;
-aMwC5iR@ }
K[|d7e for(int index=0;index<MAX_KEY;index++){
)2,\Y if(hCallWnd[index]==NULL)
"V_PWEi continue;
_bq2h%G=8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
`!T6#6h {
785Y*.p SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
2|^bDg;W+u bProcessed=TRUE;
5h(]S[Zf3 }
w3IU'(|G }
[+y/qx79 }
o;:a6D`
else if((lParam&0xc000ffff)==1){ //Key down
8>jd2'v{ switch(wParam)
Y-,1&$& {
0r\hX6 k case VK_MENU:
hMs}r,* MaskBits|=ALTBIT;
l:kF0tj" break;
pRdO4?l case VK_CONTROL:
&"svt2 MaskBits|=CTRLBIT;
h:+>=~\ break;
)6mv7M{ case VK_SHIFT:
hMx/}Tw wt MaskBits|=SHIFTBIT;
eVWnD,' break;
]HP default: //judge the key and send message
:XZ break;
.~
W^P>t }
p>p=nL K for(int index=0;index<MAX_KEY;index++)
FCmS3KIa, {
5k}UXRB? if(hCallWnd[index]==NULL)
L7*~8Y continue;
BT+ws@|[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
^Sr`)vP {
0)qLW&
w SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
vi>V6IC4v bProcessed=TRUE;
R\=y/tw0H }
:FdV$E]]< }
*K\/5Fzl }
UkL'h&J~ if(!bProcessed){
oZ~M`yOz. for(int index=0;index<MAX_KEY;index++){
^\\cGJ&8c if(hCallWnd[index]==NULL)
T3{qn$t8 continue;
7b T5-=.
if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m5LP~Gb
SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
'bg%9} }
}g _#.>D+ }
SR S~s }
T ~t%3G
return CallNextHookEx( hHook, nCode, wParam, lParam );
uoKC+8GA }
aARm nV $y> J= BOOL InitHotkey()
r jL%M'; {
U07n7`2w if(hHook!=NULL){
femAVx}go nHookCount++;
aX1|&erI return TRUE;
#tBbvs+% }
FUm-Fp else
)f'cy@b hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
A\.M/)Qo if(hHook!=NULL)
v1zJr6ra9 nHookCount++;
(85F1"Jp return (hHook!=NULL);
:h3
Gk;u }
VxfFk4 BOOL UnInit()
D1lHq/ {
bd<zn*HZ* if(nHookCount>1){
Oy[t}*Ik nHookCount--;
Yb x4 Up@ return TRUE;
!H,R$3~ }
e$tKKcj0T BOOL unhooked = UnhookWindowsHookEx(hHook);
Q_1EAxt if(unhooked==TRUE){
Vo(d)"m? nHookCount=0;
7IZ(3B<87t hHook=NULL;
q^dI!93n| }
4- 6' return unhooked;
)r1Z}X(#d }
2&!G@5 P5vM y'1X BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Ef$xum{ {
8N8B${X BOOL bAdded=FALSE;
:ZU for(int index=0;index<MAX_KEY;index++){
"mT~_BsD if(hCallWnd[index]==0){
bU:"dqRm< hCallWnd[index]=hWnd;
m(Bv}9 HotKey[index]=cKey;
kAbT&Rm" HotKeyMask[index]=cMask;
FAU^(]-5m bAdded=TRUE;
2@ACmh KeyCount++;
R_4600 break;
|vWx[=`o }
I[<C)IG }
8X*6i-j5E return bAdded;
WFN5&7$ W }
}(TZ}* d '1r:z, o| BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>&U]j*'4 {
kS?!"zk> BOOL bRemoved=FALSE;
iQin|$F_O for(int index=0;index<MAX_KEY;index++){
wTIOCj if(hCallWnd[index]==hWnd){
0t*q5pAG". if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
%wvSD&oz hCallWnd[index]=NULL;
4U> HotKey[index]=0;
`t ZvIy* HotKeyMask[index]=0;
oOe5IczS( bRemoved=TRUE;
{My/+{eS!? KeyCount--;
~`mOs1 d break;
R4QXX7h! }
Dw6Q2Gnv }
|yN7#O-D }
le|e 4f*+ return bRemoved;
}QG6KJh_% }
HHoh//(\ Z:9"7^+ void VerifyWindow()
}L@!TWR-Qu {
0=(5C\w2 for(int i=0;i<MAX_KEY;i++){
&Cdk%@Tj]B if(hCallWnd
!=NULL){ ~c3!,C
if(!IsWindow(hCallWnd)){ 0xC{Lf&
hCallWnd=NULL; HK5\i@G+<
HotKey=0; bv$)^
HotKeyMask=0; $N5}N\C:a
KeyCount--; `Nu3s<O7CF
} K}! VY`
} ep,kImT
} ~++y4NB8Q
} t~ Q{\!
,p>=WX
BOOL CHookApp::InitInstance() .azdAq'r&\
{ sRb)*p'
AFX_MANAGE_STATE(AfxGetStaticModuleState()); (K>5DU
hins=AfxGetInstanceHandle(); `2d ,=.X
InitHotkey(); 1|n,s-
return CWinApp::InitInstance(); SukRJvi
} 0j4bu}@
-5d8j<,
int CHookApp::ExitInstance() ;l5F
il,3
{ F
~
/{1Q*
VerifyWindow(); I`E9]b(w
UnInit(); >K;p+( <6
return CWinApp::ExitInstance(); i4v7x;m_p
} [D?RL`ZF
)iluu1,o
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3(}HD*{E[@
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;VYL7Xu](
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ z)yxz:E
#if _MSC_VER > 1000 @+:S'mAQC
#pragma once vXRfsv y
#endif // _MSC_VER > 1000
JTQ$p*2]
KDwjck"5;
class CCaptureDlg : public CDialog 8GV$L~i
{ [L]
ca*
// Construction N
0&h5
public: 7oh6G
BOOL bTray; ]6W#P7
BOOL bRegistered; B.;/N220P
BOOL RegisterHotkey(); X]tjT
UCHAR cKey; _)zSjFX9
UCHAR cMask; *ukugg.
void DeleteIcon(); BRFA%FZ,
void AddIcon(); J/M1#sE
UINT nCount; kiZA$:V8
void SaveBmp(); AAxY{Z-4
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Bj;Fy9[yb
// Dialog Data AnfJyltS
//{{AFX_DATA(CCaptureDlg) $^y6>@~
enum { IDD = IDD_CAPTURE_DIALOG }; iAbtv^fn
CComboBox m_Key; mz3!HksZ"
BOOL m_bControl; @T|mHfQ8
BOOL m_bAlt; ?msx
BOOL m_bShift; 6*/0 yGij
CString m_Path; `\(Fax
CString m_Number; 7?qRY9Qu
//}}AFX_DATA sr
sDnf
// ClassWizard generated virtual function overrides a(NN%'fDD
//{{AFX_VIRTUAL(CCaptureDlg) FG38) /
public: C5\bnk{
virtual BOOL PreTranslateMessage(MSG* pMsg); uK="#1z cC
protected: +kd88Fx
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O (<Wn-
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mH}/QfUlq
//}}AFX_VIRTUAL mfIY7DP
// Implementation .&TJSIx$
protected: nUz2~z
HICON m_hIcon; @]Aul9.h
// Generated message map functions 2N9
BI-a
//{{AFX_MSG(CCaptureDlg) \3hhM}6)DM
virtual BOOL OnInitDialog(); ^EN_C<V;"d
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #|
`W ]
afx_msg void OnPaint(); \vs,$h
afx_msg HCURSOR OnQueryDragIcon(); L8Z[Ly+_
virtual void OnCancel(); 8tK 8|t5+
afx_msg void OnAbout();
^GB9!d.
afx_msg void OnBrowse(); h3h2 KqM'
afx_msg void OnChange(); 5tX|@Z:
z
//}}AFX_MSG ~Wm`SIV
DECLARE_MESSAGE_MAP() Ts:3_4-k
}; |)}F}~&
#endif PnJr
5^t68
WOl
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O{,Uge2n,
#include "stdafx.h" _~d C>`K
#include "Capture.h" 'sn%+oN
#include "CaptureDlg.h" #U{^L{1Gx
#include <windowsx.h> &%ej=O
#pragma comment(lib,"hook.lib") xV:.)Dq9
#ifdef _DEBUG !t3)j>h:
#define new DEBUG_NEW 403%~
#undef THIS_FILE P>z k
static char THIS_FILE[] = __FILE__; o) `zb?
#endif p^Kp= z
#define IDM_SHELL WM_USER+1 vtc} )s\
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xC9^x7%3O
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 72GXgah
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; DQDt*Uj,
class CAboutDlg : public CDialog R|Z $aHQ
{ E<1^i;F
public: c BQ|mA
CAboutDlg(); 0cC5
// Dialog Data ?g&6l0n`
//{{AFX_DATA(CAboutDlg) ..X efNbl
enum { IDD = IDD_ABOUTBOX }; zU:zzT}|TZ
//}}AFX_DATA {6!Mf+Xq
// ClassWizard generated virtual function overrides L,!Z
//{{AFX_VIRTUAL(CAboutDlg) a\$PqOB!
protected: +[V[{n
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1M7=*w,
//}}AFX_VIRTUAL %np b.C|+
// Implementation Hv>A$x$q
protected: 6]Q
~c"+5
//{{AFX_MSG(CAboutDlg)
Ash"D~
//}}AFX_MSG [R)?93
DECLARE_MESSAGE_MAP() z%Ywjfn'
}; pv+FPB
w1F7gd
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :W<aga;J
{ NIrK+uC.d
//{{AFX_DATA_INIT(CAboutDlg) 2lDgvug
//}}AFX_DATA_INIT 2mP|
hp?
} b#FN3AsR
v1?P$f*g
void CAboutDlg::DoDataExchange(CDataExchange* pDX) m=k(6
{ N+rLbK*
CDialog::DoDataExchange(pDX); ^2[0cne
//{{AFX_DATA_MAP(CAboutDlg) U5jY/e_
//}}AFX_DATA_MAP 41>Bm*if
} :Qh5ZO&G0
NDglse
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) wa6DJ
//{{AFX_MSG_MAP(CAboutDlg) c5>&~^~>Tx
// No message handlers pMM-LY7%{
//}}AFX_MSG_MAP s/0-DHd
END_MESSAGE_MAP() 9aD6mp
ZalG/PFy
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1wmS?
: CDialog(CCaptureDlg::IDD, pParent) lb2mWsg"
{ eXx6b~D
//{{AFX_DATA_INIT(CCaptureDlg) "Nj(0&
m_bControl = FALSE; Mc oHV]x
m_bAlt = FALSE; p+@Wh3
m_bShift = FALSE; )p4o4aM
m_Path = _T("c:\\"); ?|Fu^eR%X
m_Number = _T("0 picture captured."); N6=cqUM wt
nCount=0; Jg/l<4,K,
bRegistered=FALSE; W}EI gVHs
bTray=FALSE; r.**
z j
//}}AFX_DATA_INIT 3Zs|arde2
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zL5r8mD3
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); b[$%Wg
} wxB?}
{g@Wd2-J}
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) E&}r"rbI
{ ?^mgK9^v@
CDialog::DoDataExchange(pDX); B++.tQ=X.
//{{AFX_DATA_MAP(CCaptureDlg) #s{>v$F
DDX_Control(pDX, IDC_KEY, m_Key); a8rsF
DDX_Check(pDX, IDC_CONTROL, m_bControl); hi"[R@UG
DDX_Check(pDX, IDC_ALT, m_bAlt); {6^c3R[
DDX_Check(pDX, IDC_SHIFT, m_bShift); C_dsYuQ5R
DDX_Text(pDX, IDC_PATH, m_Path); ~;_]U[eOL
DDX_Text(pDX, IDC_NUMBER, m_Number); 73P=<3
//}}AFX_DATA_MAP IhwJYPLF
} 9~I\WjB
"
"zc@(OA[z
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $TU=^W)X
//{{AFX_MSG_MAP(CCaptureDlg) d?GfT$1
ON_WM_SYSCOMMAND() t }7hD
ON_WM_PAINT() PwQW5,,h0
ON_WM_QUERYDRAGICON() ,*Y*ov23aQ
ON_BN_CLICKED(ID_ABOUT, OnAbout) 7)O?jc
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vnMt>]w-}
ON_BN_CLICKED(ID_CHANGE, OnChange) HAEgR
//}}AFX_MSG_MAP !I-+wc{ss
END_MESSAGE_MAP() F#7ZR*ZB1
okoD26tK
BOOL CCaptureDlg::OnInitDialog() ji?0;2Y
{ -Cd4yWkO
CDialog::OnInitDialog(); N(vzxx^
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); cR}}N F
ASSERT(IDM_ABOUTBOX < 0xF000); i:Pg&474f
CMenu* pSysMenu = GetSystemMenu(FALSE); qe4hNFq
if (pSysMenu != NULL) JiEcPii
{ lAJ)
CString strAboutMenu; ~:b bV6YO
strAboutMenu.LoadString(IDS_ABOUTBOX); DQP#h5O
if (!strAboutMenu.IsEmpty()) 2!\y0*}K
{ [6K2V:6:
pSysMenu->AppendMenu(MF_SEPARATOR); >/;\{IG
Wn
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \NhCu$'
} $SSE\+|3
} pRx^O
F(3
SetIcon(m_hIcon, TRUE); // Set big icon OOQfa#~k
SetIcon(m_hIcon, FALSE); // Set small icon V2g,JFp&
m_Key.SetCurSel(0); .3?'+KZ,
RegisterHotkey(); + L;[-]E8
CMenu* pMenu=GetSystemMenu(FALSE); Wy@Z)z?
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); q~p,A>K
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wYSvI
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4q/E7n
return TRUE; // return TRUE unless you set the focus to a control +P/"bwv0
} Wa
#,>
.{k(4_Q?I
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TP{lt6wws(
{ a3?Dtoy'
if ((nID & 0xFFF0) == IDM_ABOUTBOX) DBAJkBs
{ VH4P|w[YF
CAboutDlg dlgAbout; ;!, ]}2w*X
dlgAbout.DoModal(); E$.|h;i]Q
} fU@}]&
else ogs9obbZ!
{ Jc~^32
CDialog::OnSysCommand(nID, lParam); 1)/B V{n
} kMKI=>s+
} GC66n1- X
?Pw#!t
void CCaptureDlg::OnPaint() V[wEn9
{ H1| -f]!
if (IsIconic()) jz't!wj
{ t!c8c^HR
CPaintDC dc(this); // device context for painting aQCbRS6
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); daaUC
// Center icon in client rectangle FI.S?gy0
int cxIcon = GetSystemMetrics(SM_CXICON); AJ2Xq*fk
int cyIcon = GetSystemMetrics(SM_CYICON); 5IW^^<kiu
CRect rect; "M
v%M2'c
GetClientRect(&rect); [POcO
int x = (rect.Width() - cxIcon + 1) / 2; YP>VC(f
int y = (rect.Height() - cyIcon + 1) / 2; to[EA6J8l
// Draw the icon +1Si>I
dc.DrawIcon(x, y, m_hIcon); BS;rit:
} -le:0NUwI
else LnZ*,>1Z
{ /4#.qq0\{c
CDialog::OnPaint(); l"}W $3]u$
} z~4L=tA(
} 9r+ `j
e~$MIHBY]
HCURSOR CCaptureDlg::OnQueryDragIcon() 1]A%lud4
{ $Bz |[=
return (HCURSOR) m_hIcon; fbB(WE+
} |4-c/@D.~
SjKIn-
void CCaptureDlg::OnCancel() NhCO C
{ fdho`juFa
if(bTray) ^%M!!wlUH
DeleteIcon(); 9V?MJZ@aG
CDialog::OnCancel(); AS|gi!OVA
} ~ Cks)mJs
Z@
h<xo*r
void CCaptureDlg::OnAbout() ?@|1>epgd
{ ]O<Yr'
CAboutDlg dlg; ]SBv3Q0D7
dlg.DoModal(); L45&O
*%
} I-kM~q_
U'" ;
void CCaptureDlg::OnBrowse() 6TfL|W<
{ X^_,`H@
CString str; tFwQ /
BROWSEINFO bi; \b.2f+;3
char name[MAX_PATH]; eQcy'GA06
ZeroMemory(&bi,sizeof(BROWSEINFO)); ~IE:i-Kz
bi.hwndOwner=GetSafeHwnd(); g]$>G0E`oD
bi.pszDisplayName=name; 5Ag]1k{
bi.lpszTitle="Select folder"; $msT,$NJ
bi.ulFlags=BIF_RETURNONLYFSDIRS; \VHi
LPITEMIDLIST idl=SHBrowseForFolder(&bi); .{7?Y;_(
if(idl==NULL) _ H$Cm
return; T
fzad2}^
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |1g2\5Re
str.ReleaseBuffer(); g.DgJX&i
m_Path=str; >m}.}g8
if(str.GetAt(str.GetLength()-1)!='\\') 7*'_&0
m_Path+="\\";
[+{ ot
UpdateData(FALSE); /Ia=/Jj7N
} {aGQ[MH\9
1uB}Oe2~
void CCaptureDlg::SaveBmp() z9h`sY~
{ 'QeqWn
CDC dc; 5y=X?hF~)
dc.CreateDC("DISPLAY",NULL,NULL,NULL); t@}<&{zk
CBitmap bm; ~rpYZLH/:0
int Width=GetSystemMetrics(SM_CXSCREEN); |YZ`CN<
int Height=GetSystemMetrics(SM_CYSCREEN); QV{Nq=%]
bm.CreateCompatibleBitmap(&dc,Width,Height); X%`8h_
CDC tdc; s<:"rw`
tdc.CreateCompatibleDC(&dc); 70HEu@-
CBitmap*pOld=tdc.SelectObject(&bm); }xLwv=Ia
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,>{4*PM(
tdc.SelectObject(pOld); X?>S24I"9
BITMAP btm; En5Bsz!
bm.GetBitmap(&btm); m|24)%Vj;=
DWORD size=btm.bmWidthBytes*btm.bmHeight; KT?vs5jg$&
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "~]9}KM}3W
BITMAPINFOHEADER bih; E'XFn'
bih.biBitCount=btm.bmBitsPixel; e{=7,DRH<
bih.biClrImportant=0; T:;e 73
bih.biClrUsed=0; oVl:./(IB
bih.biCompression=0; l,6="5t
bih.biHeight=btm.bmHeight; hH"3Y}U@
bih.biPlanes=1; lG\lu'<C
bih.biSize=sizeof(BITMAPINFOHEADER); px4Z
bih.biSizeImage=size; K/MIDH
bih.biWidth=btm.bmWidth; 4yRT!k}o
bih.biXPelsPerMeter=0; Ba`]Sm=
bih.biYPelsPerMeter=0; qf)]!wU9
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Oq+C<}eg
static int filecount=0; V_+3@C
CString name; \hi{r@k>}
name.Format("pict%04d.bmp",filecount++); p@cPm8L3
name=m_Path+name; M_9|YjwS
BITMAPFILEHEADER bfh; =b`>ggw#
bfh.bfReserved1=bfh.bfReserved2=0; Oo7n_h1
bfh.bfType=((WORD)('M'<< 8)|'B'); }[ AIE[
bfh.bfSize=54+size; R0. `2=
bfh.bfOffBits=54; Qx.E+n\
CFile bf; 7t@jj%F
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Fi7pq2
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ANT^&NjJ7
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Jb
;el*,K
bf.WriteHuge(lpData,size); ?)]sfJG
bf.Close(); guwnYS
nCount++; tp 5]n`3rD
} "DRp4;
GlobalFreePtr(lpData); F<'g6f
if(nCount==1) !o*oT}6n
m_Number.Format("%d picture captured.",nCount); j:<E=[Kl
else tQ`tHe
m_Number.Format("%d pictures captured.",nCount); v`wPdb
UpdateData(FALSE); .':SD{
} _9L2JN$R6
:&_@U$
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ;yHA.}
{ s?0r\ cc|:
if(pMsg -> message == WM_KEYDOWN) QQC0uta`
{ B"+Ygvxb
if(pMsg -> wParam == VK_ESCAPE) 3l4k2
return TRUE; R?l>Vr
if(pMsg -> wParam == VK_RETURN) $Q47>/CUc^
return TRUE; /8Vh G|Wb
} _e`b^_
return CDialog::PreTranslateMessage(pMsg); bE0S)b)
} :$P <e~z'
r43dnwX
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |nm,5gPNC
{ RCxqqUS\C
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hfEGkaV._3
SaveBmp(); .'X$SF`
return FALSE; <Xl G :nmY
} YciZU
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !_x-aro3<
CMenu pop; xss D2*l
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); iT.hXzPzr*
CMenu*pMenu=pop.GetSubMenu(0); + FLzK(
pMenu->SetDefaultItem(ID_EXITICON); +d#ZSNu/
CPoint pt; ss,6;wfX
GetCursorPos(&pt); .bpxSU%X
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); eQC`e#%
if(id==ID_EXITICON) DbOWnXV"o
DeleteIcon(); _Z8zD[l
else if(id==ID_EXIT) [$] JvF
OnCancel(); C
#TS
return FALSE; Nk^#Sa?
} QV?\?9(
LRESULT res= CDialog::WindowProc(message, wParam, lParam); F~*
5`o
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) N:&^ql4
AddIcon(); >
]6Eb`v
return res; \J1Jn~
} 2OK%eVba
@8/-^Rh*
void CCaptureDlg::AddIcon() 0|4XV{\qT$
{ ^-=,q.[7
NOTIFYICONDATA data; RQe#X6'h
data.cbSize=sizeof(NOTIFYICONDATA); vLkZC
CString tip; ,Hj=]e2?
tip.LoadString(IDS_ICONTIP); lW>bXC
data.hIcon=GetIcon(0); nnr(\r~
data.hWnd=GetSafeHwnd(); Qz/=+A/4
strcpy(data.szTip,tip); )9@Ftzg|
data.uCallbackMessage=IDM_SHELL; uV%7|/fD
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m _:ib}
data.uID=98; ~~yo& ]
Shell_NotifyIcon(NIM_ADD,&data); OFDPtJ wV
ShowWindow(SW_HIDE); 1}V_:~7
bTray=TRUE; jfgAI7;b
} $vc:u6I[
JsiJ=zo<
void CCaptureDlg::DeleteIcon() \idg[&}l}
{ le8n!Dk(
NOTIFYICONDATA data; jUjQ{eT
data.cbSize=sizeof(NOTIFYICONDATA); B-eYWt8s
data.hWnd=GetSafeHwnd(); 5ue{&z
@T
data.uID=98; O<o_MZN
Shell_NotifyIcon(NIM_DELETE,&data); [>6:xGSe9X
ShowWindow(SW_SHOW); 'z+8;g.ekO
SetForegroundWindow(); >i`'e~%
ShowWindow(SW_SHOWNORMAL); W%Ky#!\-
bTray=FALSE; .;$/nz6vk
} $Cf_RFH0
uWMAXGL
void CCaptureDlg::OnChange() 4'_uN$${$
{ ot,<iE#za
RegisterHotkey(); nP_ s+k
} JO1c9NyKr
,gRsbC
BOOL CCaptureDlg::RegisterHotkey() QEtZ]p1H@
{ r%TgZ5~u
UpdateData(); <\yM{
V\
UCHAR mask=0; tR2IjvmsX
UCHAR key=0; Q*U$i#,
if(m_bControl) ^#"!uCq]gM
mask|=4; oOJN?97!k
if(m_bAlt) (u$Q
mask|=2; m2VF}%
EIr
if(m_bShift) `Jz"rh-M
mask|=1; 9~>;sjJk
key=Key_Table[m_Key.GetCurSel()]; S
W
if(bRegistered){ Af *^u|#
DeleteHotkey(GetSafeHwnd(),cKey,cMask); u^V`Ucd"R
bRegistered=FALSE; =u73AM}
} ZEHz/Y%
cMask=mask; 7G2TT a
cKey=key; L6U[H#3(
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xt40hZ$
return bRegistered; {) jQbAr(G
} tQUp1i{j\
=|uX?
四、小结 WFLT[j!1
5v>(xl
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。