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:
7G=P|T\
L$kAe1 V^m 一、实现方法
t>`LO g~sNY|% 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
3g
"xm
x$b[m20 #pragma data_seg("shareddata")
nR'EuI~(} HHOOK hHook =NULL; //钩子句柄
\6
0WP-s UINT nHookCount =0; //挂接的程序数目
p$G3r0@ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
s3RyLT static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
'\mZ7.Jj static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
3#ZKuGg= static int KeyCount =0;
Ip|^?uyrk static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
vo<#sa^,j #pragma data_seg()
8BH)jna`Qo Leick6 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。
Wn#JYp C>;8`6_!gU 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:
p. ~jo #i=^WN<V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
$I]x &cF cKey,UCHAR cMask)
BW\5RIWwE5 {
.W.U:C1 BOOL bAdded=FALSE;
67:<X(u+! for(int index=0;index<MAX_KEY;index++){
!Jp.3,\?~ if(hCallWnd[index]==0){
#UN{
J6{ hCallWnd[index]=hWnd;
2EcYO$R! HotKey[index]=cKey;
+VCo=oA HotKeyMask[index]=cMask;
D>^ix[:J bAdded=TRUE;
Sqt"G6< KeyCount++;
3E@&wpj break;
3Qr!?=nf }
&rWJg6/ }
&Gwh<%=U return bAdded;
l"!;Vkg.5 }
<RsKV$Je
I //删除热键
Kd1\D!#!6 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
%,q#f# {
Cx'=2Y 7 BOOL bRemoved=FALSE;
ur[bh for(int index=0;index<MAX_KEY;index++){
H)fo4N4ii if(hCallWnd[index]==hWnd){
)_.H #|r if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
O5*uL{pvT{ hCallWnd[index]=NULL;
=YsTF T HotKey[index]=0;
HON[{Oq HotKeyMask[index]=0;
54j
$A bRemoved=TRUE;
6oBt<r?CJ KeyCount--;
<aD+Ki6 break;
`7n,( }
.Vjpkt:H }
gbZ X'D
}
M8Lj*JN return bRemoved;
P[oB' }
LtIZgOd< m:7bynT{ S60`'!y DLL中的钩子函数如下:
sgsMlZ3/ <W^~Y31:0 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
KePHn:c {
1vd+p!n BOOL bProcessed=FALSE;
7NqV* if(HC_ACTION==nCode)
tqf-,BLh {
=#fvdj if((lParam&0xc0000000)==0xc0000000){// 有键松开
tR/
JY;jn switch(wParam)
(_<n0
{
/qze case VK_MENU:
.}>[Kr MaskBits&=~ALTBIT;
>Cc$ P break;
z<=t3dj case VK_CONTROL:
#Og_q$})f MaskBits&=~CTRLBIT;
1S#bV} ! break;
7si.] case VK_SHIFT:
[]^>QsS(X MaskBits&=~SHIFTBIT;
(o=iX,@'2 break;
$MGd>3%y default: //judge the key and send message
Nh-*Gt? break;
Vi-@z;k
}
|@|D''u>6 for(int index=0;index<MAX_KEY;index++){
4B
pm{b if(hCallWnd[index]==NULL)
6>%NL"* ] continue;
<O&s 'A[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
T^SOq:m& {
gE(03SX SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
K)Ka"H bProcessed=TRUE;
%LmB`DqZ }
AkC\CdmA }
pDfF'jt9 }
4TV9t"Dk+c else if((lParam&0xc000ffff)==1){ //有键按下
2O>iAzc switch(wParam)
zqn*DbT
{
.YbD.{]D case VK_MENU:
Jt][b MaskBits|=ALTBIT;
H^0KNMf( break;
p]HtJt|] case VK_CONTROL:
<C(2(3 MaskBits|=CTRLBIT;
r|8..Ll break;
lPP7w`[PA case VK_SHIFT:
Ok\UIi~ MaskBits|=SHIFTBIT;
wEyh;ID3# break;
vzPrG%Uu7g default: //judge the key and send message
-K4RQ{=>UZ break;
"
8v }
='azVw%_ for(int index=0;index<MAX_KEY;index++){
(>'d`^kjk if(hCallWnd[index]==NULL)
6zSN?0c continue;
.v'8G)6g if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
PeZ=ONY5 {
>d|W>|8e SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
K+H82$
# bProcessed=TRUE;
Rlu;l }
s RB8 jY }
i=rW{0c% }
6iOAYA= if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
0jq#,p=l; for(int index=0;index<MAX_KEY;index++){
Hr'#0fW if(hCallWnd[index]==NULL)
mqpZby continue;
) Lv{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
iFnM6O$( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
yuWrU<Kw //lParam的意义可看MSDN中WM_KEYDOWN部分
bK7DGw`1 }
8cl!8gfv }
3dfSu' }
+{&g|V return CallNextHookEx( hHook, nCode, wParam, lParam );
|RdSrVB }
2*N# %ZUX O1PdM52 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:
"wc $'7M 7O j9~3o4 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
z;)% i f6 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
p w8'+FX l\)Q3.w 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:
LBzpaLd X^`ld&^*({ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
]|oqJ2P {
u Wtp2]A if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
C" {j0X` {
u]"RAH //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
)yJjJ:re SaveBmp();
l}{O return FALSE;
uxBk7E%6 }
HukHZ;5 …… //其它处理及默认处理
V=U %P[S }
Aka`L:k $J+$8pA HD|5:f AqA 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
:Wln$L$ 1Pbp=R/7ar 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。
.(krB%N U]d+iz??b 二、编程步骤
r+n&Pp+9 G{<wXxq% 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";
#gq3 e tpS F[W 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
8LOzL,Ah 94+#6jd e 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;
/W;;7k ck;owGlT 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;
F+X3CB,f QJ
QQ- 5、 添加代码,编译运行程序。
>2ct1_ 5:6mptn> 三、程序代码
Zn/1uWO Q{RHW@_/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
W'[!4RQL #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
;:cM^LJ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
d-4u*> #if _MSC_VER > 1000
a&&EjI #pragma once
*i|hcDk #endif // _MSC_VER > 1000
i
):el= #ifndef __AFXWIN_H__
m{X;|-DK[ #error include 'stdafx.h' before including this file for PCH
`7NgQ*g.d/ #endif
;YB8X&H$ #include "resource.h" // main symbols
0xsvxH"* class CHookApp : public CWinApp
3x#G
SS {
>Kxl+F public:
K_xn> CHookApp();
CZ@M~Si_ // Overrides
8`+X6iZOQ // ClassWizard generated virtual function overrides
z-,'W` //{{AFX_VIRTUAL(CHookApp)
u%2u%-w public:
Y?> S.B7 virtual BOOL InitInstance();
dJkTHmw virtual int ExitInstance();
:=* -x //}}AFX_VIRTUAL
iS{)Tll}& //{{AFX_MSG(CHookApp)
3B,nHU // NOTE - the ClassWizard will add and remove member functions here.
L\"$R":3{d // DO NOT EDIT what you see in these blocks of generated code !
.UJk0%1 //}}AFX_MSG
"5@Y\L DECLARE_MESSAGE_MAP()
cq/)Yff@: };
v<O\ l~S LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
<ioX|.7ZX BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
WTXTr0= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
y
jb.6 BOOL InitHotkey();
d;f,vN( BOOL UnInit();
0FXM4YcrJO #endif
bw@tA7Y *H;&hq //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
SN11J+ #include "stdafx.h"
lcih
[M6z #include "hook.h"
/8.; #include <windowsx.h>
;$nK
^ #ifdef _DEBUG
m^`X|xK- #define new DEBUG_NEW
b*,R9 #undef THIS_FILE
SN+&'?$WD static char THIS_FILE[] = __FILE__;
3>;U||O #endif
luV%_[F #define MAX_KEY 100
9t= erhUr #define CTRLBIT 0x04
n32?GRp #define ALTBIT 0x02
mv5!fp_*7 #define SHIFTBIT 0x01
H~
(I #pragma data_seg("shareddata")
bju0l[;= HHOOK hHook =NULL;
S6cSeRmw UINT nHookCount =0;
ImgKqp0Z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
(|Xf=q,Le static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
r,F'Jd5 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
(33[N static int KeyCount =0;
p/@z4TCNX static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{ `-EX #pragma data_seg()
qlSMg;"Ghw HINSTANCE hins;
bBjVot void VerifyWindow();
E#T'=f[r~ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
Y5K!DMKY //{{AFX_MSG_MAP(CHookApp)
')_jK',1 // NOTE - the ClassWizard will add and remove mapping macros here.
AX6e}-S1n // DO NOT EDIT what you see in these blocks of generated code!
5^pQ=Sgt //}}AFX_MSG_MAP
eK]GyY/Y END_MESSAGE_MAP()
CvlAn7r,@ ofS9h*wrJ CHookApp::CHookApp()
ao
32n {
m^p
Q55, // TODO: add construction code here,
Rd 2* // Place all significant initialization in InitInstance
1V)0+_Yv }
=#8J9 <&:3|2p CHookApp theApp;
\@5W&Be^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
2H4+D) {
N:=D@x~] BOOL bProcessed=FALSE;
}P^{\SDX if(HC_ACTION==nCode)
H.'_NCF&;L {
ucTkWqG if((lParam&0xc0000000)==0xc0000000){// Key up
-6#i~a] switch(wParam)
28zt.9 {
d
d8^V_Kx case VK_MENU:
5C/u`{4]Hg MaskBits&=~ALTBIT;
F*}b), break;
3<B{-z case VK_CONTROL:
<;M 6s~ MaskBits&=~CTRLBIT;
&u$l2hSS break;
2f F)I& case VK_SHIFT:
)-[X^l
j MaskBits&=~SHIFTBIT;
Y ||!V break;
xOP\ +( default: //judge the key and send message
tw^V?4[Miu break;
r/8,4:rh }
t'~:me! for(int index=0;index<MAX_KEY;index++){
Z3 &8(vw if(hCallWnd[index]==NULL)
YAsvw\iseK continue;
9'O<d/xj/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
J0^p\mG {
AlGD .K SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,v(G2`Z bProcessed=TRUE;
GMd81@7 }
#~nI^
ggW }
vrh}X[JEw' }
0p![&O else if((lParam&0xc000ffff)==1){ //Key down
IgZX,4i=o switch(wParam)
|qfnbi-\ {
D`iWf3a. case VK_MENU:
L[<MBgFKv MaskBits|=ALTBIT;
/ZX8gR5x break;
dDAdZxd case VK_CONTROL:
cND2(<jx: MaskBits|=CTRLBIT;
Wu%;{y~#} break;
{{:MJ\_"h_ case VK_SHIFT:
("wPkm^ MaskBits|=SHIFTBIT;
CEt_wKzf break;
E/Y.f default: //judge the key and send message
wHdq :,0-! break;
0W#.$X5 }
e(j"u;= for(int index=0;index<MAX_KEY;index++)
WF_G GF{ {
6$2)m;| XY if(hCallWnd[index]==NULL)
n6
) continue;
ptYQP^6S[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7-bU9{5 {
7J##IH+z35 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Oxy.V+R bProcessed=TRUE;
"!r7t4 }
O]i}r`E8, }
%5jxq9:K }
mii9eZ if(!bProcessed){
IN),Lu0K for(int index=0;index<MAX_KEY;index++){
,NKDEcw] if(hCallWnd[index]==NULL)
X2Y-TET continue;
amgYr$)m if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^i#F+Q`1 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
QfRt3\^` }
mLKwk6I }
v:<u0B-)$ }
j =[Td return CallNextHookEx( hHook, nCode, wParam, lParam );
g7#_a6 }
D6c4tA^EO 8V.x%T BOOL InitHotkey()
%]RzC`NZ {
F71.%p7C8" if(hHook!=NULL){
O zY&^:> nHookCount++;
ytr~} M% return TRUE;
%F1 Ce/ }
7teg*M{ else
2A
{k>TjQ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]`]m41+w if(hHook!=NULL)
cD]{ Nn nHookCount++;
`[/BG)4 return (hHook!=NULL);
" ?n~ /9` }
=@&]PYv BOOL UnInit()
o=4d2V%m {
,]1K^UeZ if(nHookCount>1){
!dStl:B nHookCount--;
`QAotSO+ return TRUE;
jcv3ES^ }
:1=mNrg BOOL unhooked = UnhookWindowsHookEx(hHook);
Jc:*X4-' if(unhooked==TRUE){
.Mdxbs6.C nHookCount=0;
[u=b[( hHook=NULL;
-i7W|X" }
Yc+/="&z return unhooked;
Mryi6X T }
,`)!K}2 Sh}AGNE' BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
eB^:+h#A_ {
8xZN4ck_@ BOOL bAdded=FALSE;
lRX*\M\` for(int index=0;index<MAX_KEY;index++){
!$f@j6. if(hCallWnd[index]==0){
f
\[Z`D hCallWnd[index]=hWnd;
qP *$wKY, HotKey[index]=cKey;
bY&s$Ry3" HotKeyMask[index]=cMask;
#*1\h=bzmW bAdded=TRUE;
i{
eDV
KeyCount++;
dGTAZ(1W break;
7[ *,t }
0:Ak4L6k }
fLxFF return bAdded;
7-Fh!=\f/ }
iVREkZ2SC /DJyNf* BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
N@)tU;U3O {
bxK1v7 BOOL bRemoved=FALSE;
`4gm'C for(int index=0;index<MAX_KEY;index++){
SP97Q- if(hCallWnd[index]==hWnd){
;HgV(d#X if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
owJPEx hCallWnd[index]=NULL;
}I9\=jT HotKey[index]=0;
$+R0RqV$V~ HotKeyMask[index]=0;
ie=tM'fb bRemoved=TRUE;
iw12x: KeyCount--;
a<rk'4,8a break;
sn]8h2z }
iKs/8n }
X-e)w }
W{?7Pn?1` return bRemoved;
OtrO"K }
^kzw/.I{ W,}HQ void VerifyWindow()
=;i@,{
~ {
CT6a for(int i=0;i<MAX_KEY;i++){
l{E+j% if(hCallWnd
!=NULL){ 5kofO
if(!IsWindow(hCallWnd)){ oost}%WxN
hCallWnd=NULL; ZS4lb=)G
HotKey=0; { P&l`
HotKeyMask=0; LTm2B_+
KeyCount--; .UU BAyjm
} '&xv)tno
} K\`L>B. 1
} mflH &Bx9
} !/BXMj,=
^$4d'
BOOL CHookApp::InitInstance() 4M}u_}9
{ F9^8/Z
AFX_MANAGE_STATE(AfxGetStaticModuleState()); bYYyXM
hins=AfxGetInstanceHandle(); 3;u* _ ]N_
InitHotkey(); k "LbB#Q
return CWinApp::InitInstance(); 9axJ2J'g
} >u4%s7v
CVyqr_n65/
int CHookApp::ExitInstance() +>@<'YI<
{ EX~ U(JB6
VerifyWindow(); q1;}~}W;z4
UnInit(); KE]!7+8-
return CWinApp::ExitInstance(); AVyqtztQ
} k
?X
QyuSle
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2a3hm8%U
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) SYOND>E
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l23_K7
#if _MSC_VER > 1000 /o*r[g7<
#pragma once BHy#g>KUF
#endif // _MSC_VER > 1000 6HW<E~G'6
`i<;5s!rX
class CCaptureDlg : public CDialog j{C+`~O
{ Ig-9Y;hdmn
// Construction XI~2Vzht
public: Ec y|l;
BOOL bTray; 82WXgB>
BOOL bRegistered; !=;^Grv>
BOOL RegisterHotkey(); KDhr.P.~
UCHAR cKey; w*Vf{[a'
UCHAR cMask; (`>RwooE
void DeleteIcon(); %K@D{)r_^
void AddIcon(); G9TK)Nz
UINT nCount; 2M3.xUS
void SaveBmp(); hu%UEB
CCaptureDlg(CWnd* pParent = NULL); // standard constructor
n4h@{Xg
// Dialog Data }xJ9EE*G/
//{{AFX_DATA(CCaptureDlg) \Azl6`Em
enum { IDD = IDD_CAPTURE_DIALOG }; x00"d$!
CComboBox m_Key; AkrUb$ }
BOOL m_bControl; yQ?N*'}$
BOOL m_bAlt; )q&=x2`
BOOL m_bShift; s?@{
CString m_Path; HF"
v
\
CString m_Number; K'+GK S7.
//}}AFX_DATA *Em 9R
// ClassWizard generated virtual function overrides [ Lt1OdGl
//{{AFX_VIRTUAL(CCaptureDlg) Jtnuo]{R
public: Uc/MPCqZ
virtual BOOL PreTranslateMessage(MSG* pMsg); 'j6PL;~c
protected: ?g+0S@{i $
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8l-+
4~mH
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WBFG_])
//}}AFX_VIRTUAL u>Z;/kr
// Implementation QKDY:1]
protected: HaXlc8
HICON m_hIcon; >:!TfuU^R
// Generated message map functions rj&
//{{AFX_MSG(CCaptureDlg) AdxCP\S&
virtual BOOL OnInitDialog(); !([Q1r{u
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); br*L|s\P\9
afx_msg void OnPaint(); U$@p"F@P
afx_msg HCURSOR OnQueryDragIcon(); )sWdN(E3
virtual void OnCancel(); oM/(&"
afx_msg void OnAbout(); -yHVydu=
afx_msg void OnBrowse(); RUC
V!L
afx_msg void OnChange(); *lRP ZN
//}}AFX_MSG 2cY7sE068
DECLARE_MESSAGE_MAP() TK<~(Dk
}; dPwe.:
#endif 3
[: x#r
Va/LMw
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D$
zKkPYI
#include "stdafx.h" `X'-4/Y
#include "Capture.h" #80DM
#include "CaptureDlg.h" }2:/&H'
#include <windowsx.h> *Nloa/a&9
#pragma comment(lib,"hook.lib") pRe, B'&
#ifdef _DEBUG UKMr,{iy
#define new DEBUG_NEW "z)dz,&T
#undef THIS_FILE NTS
tk{s,
static char THIS_FILE[] = __FILE__; +h_'hz&HlS
#endif Me;@/;c(
#define IDM_SHELL WM_USER+1 tz\7,yGT
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m/gl7+
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J;,6ydf8!
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D ksSD
class CAboutDlg : public CDialog %B5.zs]Of
{ )F4H'
public: 4:RL[;
CAboutDlg(); xq+$Q:f
// Dialog Data -bJht
//{{AFX_DATA(CAboutDlg) t-*oVX3D
enum { IDD = IDD_ABOUTBOX }; H6X]D"Y,
//}}AFX_DATA Ve#VGlI
// ClassWizard generated virtual function overrides Vui5Z K
//{{AFX_VIRTUAL(CAboutDlg) teH $hd-q
protected: FZ'|z8Dm
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <ek_n;R
//}}AFX_VIRTUAL *jM~VTXwt
// Implementation z6 2gF|Uj
protected: F#>?i}
//{{AFX_MSG(CAboutDlg) ig:,: KN
//}}AFX_MSG A ^@:Ps
DECLARE_MESSAGE_MAP() nQ2V
}; k_?xiOSh
xtMN<4#E
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) xzTTK+D@
{ fYU/Jn#
//{{AFX_DATA_INIT(CAboutDlg) OBaG'lrZy
//}}AFX_DATA_INIT k0~mK7k
} &0Yv*,4]
]v j=M-:+
void CAboutDlg::DoDataExchange(CDataExchange* pDX) NKf][!bi
{ 6KC.l}Y*
CDialog::DoDataExchange(pDX); a<9gD,]P
//{{AFX_DATA_MAP(CAboutDlg) |Z'NMJU
//}}AFX_DATA_MAP HTiqErD2_
} |!:ImX@
tn!z^W
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g BfYm
//{{AFX_MSG_MAP(CAboutDlg) ZLw7-H6Fh
// No message handlers f(~xdR))eh
//}}AFX_MSG_MAP u&Ts'j
END_MESSAGE_MAP() ZRN*.
.|`JS?L[
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d1VNTB
: CDialog(CCaptureDlg::IDD, pParent) CnyCEIO-
{ {E`[`Kf
//{{AFX_DATA_INIT(CCaptureDlg) :#W40rUb
m_bControl = FALSE; xp-.,^q\w
m_bAlt = FALSE; C9>tj=yEY
m_bShift = FALSE; Sn=|Q4ZN
m_Path = _T("c:\\"); -3`S;Dmn
m_Number = _T("0 picture captured."); ?Iy$'am]L
nCount=0; _ #]uk&5a
bRegistered=FALSE; ^*(*tS|M
bTray=FALSE; V)#se"GV
//}}AFX_DATA_INIT lj0"2@z3"E
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 VL=. JwK
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;1PnbU b
} _V\rs{
5
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Qk
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Y^DS~CrM
{ d#E]>:w9
CDialog::DoDataExchange(pDX); 5VIc
//{{AFX_DATA_MAP(CCaptureDlg) )jkX&7x
DDX_Control(pDX, IDC_KEY, m_Key); ?,~B@Kx
DDX_Check(pDX, IDC_CONTROL, m_bControl); J%`-K"NB
DDX_Check(pDX, IDC_ALT, m_bAlt); u:#+R_0#97
DDX_Check(pDX, IDC_SHIFT, m_bShift); .w=( G
DDX_Text(pDX, IDC_PATH, m_Path); Y/cnj n
DDX_Text(pDX, IDC_NUMBER, m_Number); }pOL[$L
//}}AFX_DATA_MAP W FVx7
} ;mH O#
<>JN3?
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) NFq&a i
//{{AFX_MSG_MAP(CCaptureDlg) *6D0>F
ON_WM_SYSCOMMAND() tSX<^VER7
ON_WM_PAINT() B1dVHz#
ON_WM_QUERYDRAGICON() 7x`dEi<
ON_BN_CLICKED(ID_ABOUT, OnAbout) 3aIP^I1
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) vf6_oX<Os
ON_BN_CLICKED(ID_CHANGE, OnChange) |hBX"
//}}AFX_MSG_MAP KW.*LoO
END_MESSAGE_MAP() (
HCB\!g
R~OameRR
BOOL CCaptureDlg::OnInitDialog() q
SR\=:$
{ mLApF5Hy
CDialog::OnInitDialog(); LVNq@,s
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j\l9|vpp
ASSERT(IDM_ABOUTBOX < 0xF000); H]&a}WQ_
CMenu* pSysMenu = GetSystemMenu(FALSE); &4 Py
if (pSysMenu != NULL) / blVm1F
{ 7PQ03dtfg
CString strAboutMenu; (B|4wR\
strAboutMenu.LoadString(IDS_ABOUTBOX); 4CA(` _i~
if (!strAboutMenu.IsEmpty()) '.Iz*%"
{ k"_i7
pSysMenu->AppendMenu(MF_SEPARATOR); -6lsR
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (iub \`
} ?+#|h;M8
} a@(4X/|
SetIcon(m_hIcon, TRUE); // Set big icon ny# ?^.1
SetIcon(m_hIcon, FALSE); // Set small icon }
IJ
m_Key.SetCurSel(0); 9))E\U
RegisterHotkey(); _BGw)Z 6
CMenu* pMenu=GetSystemMenu(FALSE); 7)&}riQ
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _'pow&w~
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $="t7C9S
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2R9AYI
return TRUE; // return TRUE unless you set the focus to a control 533n
z8&9@
} ~uqpF-.
WAr;g?Q8
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) t^eWFX
{ "|P8L|
@*
if ((nID & 0xFFF0) == IDM_ABOUTBOX) K@av32{
{ Ln6\Iis
CAboutDlg dlgAbout; G.v zz-yG
dlgAbout.DoModal(); _,*ld#'s
} P$LHsg]
else o,o,(sII
{ l2&cwjc
CDialog::OnSysCommand(nID, lParam); nx{_^sK
} _$s ;QI]x
} *12,MO>go
-|E|-'
void CCaptureDlg::OnPaint() R^8L^8EL
{ 5G5P#<Vv
if (IsIconic()) zTA+s 2
{ &'%b1CbE
CPaintDC dc(this); // device context for painting 'a ]4]d
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); f#4,2Xf
// Center icon in client rectangle M"cB6{st[
int cxIcon = GetSystemMetrics(SM_CXICON); JjBG9Rp{
int cyIcon = GetSystemMetrics(SM_CYICON); QwF\s13
CRect rect; U*Q1(C
GetClientRect(&rect); Dn{
hU$*
int x = (rect.Width() - cxIcon + 1) / 2; +?"N5%a%F
int y = (rect.Height() - cyIcon + 1) / 2; .Up\ 0|b
// Draw the icon ^{z@=o<o
dc.DrawIcon(x, y, m_hIcon); VI83 3
} PL+r*M%ll
else mOiA}BGw
{ Rb!|2h)
CDialog::OnPaint(); 5]C}044
} WhPwD6l>
} _H[LUl9
,3 !D(&
HCURSOR CCaptureDlg::OnQueryDragIcon() Hn~=O8/2
{ o1jDQ+
return (HCURSOR) m_hIcon; J\7ukm"9
} nR%ASUx:Y
06hzCWm#
void CCaptureDlg::OnCancel() zj~(CNE
{ =&Dt+f&
if(bTray) CM$q{;y
DeleteIcon(); 3&H#LGoV$
CDialog::OnCancel(); LjZvWts?
} D@jG+k-Lm
j?!BHNs
void CCaptureDlg::OnAbout() ~Sq!P
{ :{#%_^}k
CAboutDlg dlg; \}CQo0v
dlg.DoModal(); NBLiwL37{
} W lDcKY
sZ~q|}D-
void CCaptureDlg::OnBrowse() um/2.Sn>
{ )-2sk@y
CString str; IZr~h9
BROWSEINFO bi; 4<`Qyul-
char name[MAX_PATH]; \*>r[6]*&5
ZeroMemory(&bi,sizeof(BROWSEINFO)); ~3]ZN'b\
bi.hwndOwner=GetSafeHwnd(); 93Z/|7
bi.pszDisplayName=name; f?KHp|
bi.lpszTitle="Select folder"; p]/qf\E
bi.ulFlags=BIF_RETURNONLYFSDIRS; Eqx2.S
LPITEMIDLIST idl=SHBrowseForFolder(&bi); n-HQk7=mQ
if(idl==NULL) T{9pNf-
return; @|e4.(9A
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I``S%`h
str.ReleaseBuffer(); YH_mWN\Wu
m_Path=str; +sN'Y/-
if(str.GetAt(str.GetLength()-1)!='\\') aT9+]
Ig
m_Path+="\\"; qN5 ru2
UpdateData(FALSE); gmCW__oR
} N)F&c!anh
oJ
r&9.S
void CCaptureDlg::SaveBmp() 0?DD!H)&w
{ 5AX
AIP n)
CDC dc; {2|[7oNT6
dc.CreateDC("DISPLAY",NULL,NULL,NULL); z]/;?
CBitmap bm; j41)X'MgJ
int Width=GetSystemMetrics(SM_CXSCREEN); j`fQN
int Height=GetSystemMetrics(SM_CYSCREEN); ;m/h?Y~
bm.CreateCompatibleBitmap(&dc,Width,Height); ld RV
JVZc
CDC tdc; J[Ckz]
tdc.CreateCompatibleDC(&dc); [
" n+2;
CBitmap*pOld=tdc.SelectObject(&bm); +[LG>
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); U;o$=,_p
tdc.SelectObject(pOld); bn$('
BITMAP btm; :v=^-&t
bm.GetBitmap(&btm); n*'i{P]
DWORD size=btm.bmWidthBytes*btm.bmHeight; ,F&TSzH[@v
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); O)0}yF$0
BITMAPINFOHEADER bih; @D?KS;#
bih.biBitCount=btm.bmBitsPixel; c"nowbf
bih.biClrImportant=0; E_fH,YJ?9
bih.biClrUsed=0; |E%i
t?3M
bih.biCompression=0; ~0;l\^
bih.biHeight=btm.bmHeight; Yf=an`"
bih.biPlanes=1; 2sezZeMV
bih.biSize=sizeof(BITMAPINFOHEADER); tHhau.!
bih.biSizeImage=size; s}
I8:ufT
bih.biWidth=btm.bmWidth; W0zRV9"P
bih.biXPelsPerMeter=0; pUGFQ."\
bih.biYPelsPerMeter=0; W6e,S[J^FY
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); i~};5j(
static int filecount=0; ]lX`[HX7
CString name; xz$-_NWW
name.Format("pict%04d.bmp",filecount++); (-<s[VnXP
name=m_Path+name; Y/%(4q*'
BITMAPFILEHEADER bfh; GnX+.uQL|
bfh.bfReserved1=bfh.bfReserved2=0; jTR>H bh
bfh.bfType=((WORD)('M'<< 8)|'B'); }9Th`
bfh.bfSize=54+size; (D.B'V#>
bfh.bfOffBits=54; :,@"I$>*/
CFile bf; q=EHB5!q
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A`'k5uG
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $#ve^.VHv
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); G_vcuCHm
bf.WriteHuge(lpData,size); _1c0pQ ^}3
bf.Close(); ?S*Cvr+=4
nCount++; >,Z[IAU.x5
} 9\QeH'A
GlobalFreePtr(lpData); wZ(H[be
if(nCount==1) (G>S`B
m_Number.Format("%d picture captured.",nCount); s6U$]9 `
else lQ8h -Tz
m_Number.Format("%d pictures captured.",nCount); h_( #U)z_3
UpdateData(FALSE); /?ZO-]q
} B4D#TlB
Oc6_x46S4
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) YaBZ#$r
{ EJCf[#Sf
if(pMsg -> message == WM_KEYDOWN) Kl'u
{ 65HP9`5Tm
if(pMsg -> wParam == VK_ESCAPE) Z!/!4(Fh
return TRUE; Q!91uNL
if(pMsg -> wParam == VK_RETURN) v)f;dq ^z-
return TRUE; Jbv[Ql#
} R&-Vm3mc3
return CDialog::PreTranslateMessage(pMsg); &x":
} 2l4*6rYa(
(&B`vgmb
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vcmB)P-T`O
{ PeX^aEc
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ xg;o<y KF
SaveBmp(); D2y[?RG
return FALSE; #VvU8"u
} } SNZl`>
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ wHR# -g'
CMenu pop; O)aWTI
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rA\6y6dFs
CMenu*pMenu=pop.GetSubMenu(0); Z!& u_
pMenu->SetDefaultItem(ID_EXITICON); mA?fCs
CPoint pt; FwjmC%iY
GetCursorPos(&pt); !RXG{1:
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %tE#%;Z
if(id==ID_EXITICON) 4:I'zR5
DeleteIcon(); ^pysoaZCT_
else if(id==ID_EXIT) svaclkT=
OnCancel(); *y0=sG1+D
return FALSE; R1/h<I:
} F"ua`ercI
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n^t!+
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D}MCVNd^
AddIcon(); lEYAq'=
return res; S;8gX1Uf
} W]CsKN,K
~Z>!SMXp<
void CCaptureDlg::AddIcon() 6Mj(B*c
{ Z1y=L$t8
NOTIFYICONDATA data; Mb^E
data.cbSize=sizeof(NOTIFYICONDATA); ,J4rKGG
CString tip; W\pO`FL
tip.LoadString(IDS_ICONTIP); WAUgbImc{
data.hIcon=GetIcon(0); Xl %ax!/
data.hWnd=GetSafeHwnd(); ?'IY0^
strcpy(data.szTip,tip);
Tb[1\
data.uCallbackMessage=IDM_SHELL; z[sP/{~z
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k
d9<&.y{
data.uID=98; fZtuP1-4
Shell_NotifyIcon(NIM_ADD,&data); k0v&U@+-J
ShowWindow(SW_HIDE); fe4Ki
bTray=TRUE; TF%MO\!
} a;h.I}*]
V#,jUH|
void CCaptureDlg::DeleteIcon() 5hvg]w95;
{ >+FaPym
NOTIFYICONDATA data; sqEOXO
data.cbSize=sizeof(NOTIFYICONDATA); =L]GQ=d
data.hWnd=GetSafeHwnd(); k^#+Wma7
data.uID=98; Fd;%wWY.zm
Shell_NotifyIcon(NIM_DELETE,&data); ]ft}fU5C1
ShowWindow(SW_SHOW); _*.ImD
SetForegroundWindow(); )gHfbUYS
ShowWindow(SW_SHOWNORMAL); )?MUUI :
bTray=FALSE; 0a}a
} (Zoopkxw
P;U(2;9 N
void CCaptureDlg::OnChange() )Y &RMYy
{ -(lCM/h
RegisterHotkey(); fc<~R
} >]<4t06D
UJiy]y
BOOL CCaptureDlg::RegisterHotkey() i@L_[d^|j`
{ @#2KmM~I
UpdateData(); xO{$6M3-~
UCHAR mask=0; k@[{_@>4^
UCHAR key=0; ~zYk,;m
if(m_bControl) IwVdx^9
mask|=4; XM57 UG
if(m_bAlt) x~u"KU2B
mask|=2; 1W'0h$5^"
if(m_bShift) @h,3"2W{Ev
mask|=1; e|d~&Bk0
key=Key_Table[m_Key.GetCurSel()]; UBWUq
if(bRegistered){ \ RS
,Y
DeleteHotkey(GetSafeHwnd(),cKey,cMask); P47x-;
bRegistered=FALSE; eXAJ%^iD
} Q#5~"C
cMask=mask; ;J,`v5z0:
cKey=key; \h@3dJ4
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); awl3|k/
return bRegistered; }0}=-g&
} LaX<2]Tx:
K"jS,a?s 6
四、小结 Z</57w#-7
wE3fKG.
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。