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:
-&Rv=q>
*;<fh,wOk 一、实现方法
qmrT dG _#8hgwf> 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:
aacy5E pjeNBSu6 #pragma data_seg("shareddata")
sZ `Tv[ HHOOK hHook =NULL; //钩子句柄
AxEyXT( h5 UINT nHookCount =0; //挂接的程序数目
&G{GLP?H static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
&o:5lxR{ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
[M|^e;tWK static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
=*\s`ox` static int KeyCount =0;
;blL\|ch; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
,Z`}!%? #pragma data_seg()
H/,KY/>i eaw!5]huu 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。
^m\o(R Kd\0nf6 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:
1/DtF j\y;~
V BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Ymut]`dX cKey,UCHAR cMask)
@C;1e7 {
+f3Rzx] BOOL bAdded=FALSE;
v rs for(int index=0;index<MAX_KEY;index++){
v:O{"s if(hCallWnd[index]==0){
'/\ hCallWnd[index]=hWnd;
`+H=3`}X HotKey[index]=cKey;
A7p4M?09 HotKeyMask[index]=cMask;
jv)+qmqo! bAdded=TRUE;
bvox7V> KeyCount++;
"HOZ2_(o break;
~1G^IZ6 }
ptCF))Zm' }
\:vF FK4a return bAdded;
WogUILB }
c{q+h V= //删除热键
.3
EZk86 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;n&95t1$ {
8_Oeui(i BOOL bRemoved=FALSE;
"j>X^vn for(int index=0;index<MAX_KEY;index++){
{R1]tGOf if(hCallWnd[index]==hWnd){
rOJ>lPs if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Y=S0|!u hCallWnd[index]=NULL;
5KCQvv\ HotKey[index]=0;
s*uA3}j HotKeyMask[index]=0;
i<uU_g'M bRemoved=TRUE;
q;{(o2g KeyCount--;
)_#V>cvNG break;
4_#$k{ }
4I4m4^ }
Ob0sB@ }
M.}9)ho return bRemoved;
=G-OIu+H!U }
.:S/x{~ "K{_?M`;e
}x'*3zI DLL中的钩子函数如下:
x9lA';}) AL]gK)R LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
.$U,bE {
QV|6"4\ BOOL bProcessed=FALSE;
JPI%{@Qc^ if(HC_ACTION==nCode)
DV5hTw0 {
Q'<AV1< if((lParam&0xc0000000)==0xc0000000){// 有键松开
.S` q2C\ switch(wParam)
:V/".K-:J {
6H#:rM case VK_MENU:
wE
.H:q4& MaskBits&=~ALTBIT;
Ev fvU:z break;
HE}0_x. case VK_CONTROL:
mxlh\'b MaskBits&=~CTRLBIT;
Xaz "! break;
[4Q;(67 case VK_SHIFT:
x'|ty[87 MaskBits&=~SHIFTBIT;
|<W$rzM break;
@Q1!xA^S default: //judge the key and send message
9*" break;
m6Dm1'+ }
Tmg C {_ for(int index=0;index<MAX_KEY;index++){
r)<A YX]J if(hCallWnd[index]==NULL)
OUv )`K continue;
2Kxb(q" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
v93b8/1 {
{&1L &f< SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
cy%M$O|hX5 bProcessed=TRUE;
_}[
Du/c }
}?[];FB }
gM96RY }
|MNSIb&,W else if((lParam&0xc000ffff)==1){ //有键按下
ieyK$q switch(wParam)
^t0!Dbx3SE {
.6y+van case VK_MENU:
L>Y+}]~ MaskBits|=ALTBIT;
C[FHqo9M?H break;
Ym'h
vK case VK_CONTROL:
.; MS78BR MaskBits|=CTRLBIT;
1RAkqw<E break;
f+e"`80$*C case VK_SHIFT:
1W|jC MaskBits|=SHIFTBIT;
d1~#@6CIz break;
.@ H:P default: //judge the key and send message
pGie!2T E break;
'54\!yQ<{ }
/-M:6 for(int index=0;index<MAX_KEY;index++){
Dk
`&tr if(hCallWnd[index]==NULL)
#`Su3~T=S continue;
eWH0zswG if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~WA@YjQ] {
tZ]gVgZg SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
rPk|2l,E,3 bProcessed=TRUE;
-2.7Z`*( }
jKUEs75] }
:zL)O }
^J^,@Hf_ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
QE]'Dc% for(int index=0;index<MAX_KEY;index++){
Ts!'>_<Je if(hCallWnd[index]==NULL)
')xOL=w continue;
L;V8c if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
I%d=c0>% SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+\=g&G, //lParam的意义可看MSDN中WM_KEYDOWN部分
1l-5H7^w2? }
h&4s%:_4 }
LL<xygd }
>a8iY|QY return CallNextHookEx( hHook, nCode, wParam, lParam );
*fN+wiPD }
# ~<]z 93*csO?Db 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:
p%I)&- 8 N[Z`tk?- BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
lY,^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
eo+<@83 V.Hv6 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:
N,Y)'s< Zc7;&cz LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
w$
8r<?^3 {
cSt)Na~C if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
KVZB`c$<t {
R3B+vLGX //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
qO{z{@jo55 SaveBmp();
ZthT('"a return FALSE;
JBY.er`6C }
%`]+sg[i …… //其它处理及默认处理
qzW3MlD }
snaAn?I4 "0eX/rY% oc1BOW z 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
|~Dl<#58 ~& -h5=3 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
5RPG3ppS sVyV|!K 二、编程步骤
r;Sk[Y5# KZKE&bTx 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
:T-DxP/ +bumWOQ' 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
g Wtc3 '| i?-(f) 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
,`t+X=# [c{\el9H 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
FL{Uz+Q /A{ Zf'DI 5、 添加代码,编译运行程序。
x2!R&q8U> K P]ar. 三、程序代码
U9oUY> 9
{/QVs?d ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Lt*P& #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
G9:XEEN #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
REW[`MBQ #if _MSC_VER > 1000
2U)n^ #pragma once
;,bgJgK #endif // _MSC_VER > 1000
oC5h-4~ #ifndef __AFXWIN_H__
]dUG=dWO #error include 'stdafx.h' before including this file for PCH
_a$qsY #endif
^xe+(83S2? #include "resource.h" // main symbols
wI@87& class CHookApp : public CWinApp
@R&d<^I&M {
4en3yA0.w public:
Gxw1P@<F: CHookApp();
`'1g>Ebk0 // Overrides
nCY kUDnZ // ClassWizard generated virtual function overrides
x9YQd69 //{{AFX_VIRTUAL(CHookApp)
$toTMah
w public:
qFm w9\Fn virtual BOOL InitInstance();
)]@h}K} virtual int ExitInstance();
X%yG{\6: //}}AFX_VIRTUAL
:[CV_ME.; //{{AFX_MSG(CHookApp)
UWT%0t_T // NOTE - the ClassWizard will add and remove member functions here.
o]1BWwtY& // DO NOT EDIT what you see in these blocks of generated code !
a7g;8t-& //}}AFX_MSG
9xR5Jm>k DECLARE_MESSAGE_MAP()
wQSan&81Q };
ABCm2$< LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Yg&(kmm BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
?X@!jB,Pv BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
G80N8Lm BOOL InitHotkey();
4)gG_k BOOL UnInit();
x7S\-<8 #endif
!Gmnck&+ @j|E"VYY //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
&5 "!0 #include "stdafx.h"
3^/w`(-{@ #include "hook.h"
.\
Ijq! #include <windowsx.h>
=UKxf #ifdef _DEBUG
\0)jWCK #define new DEBUG_NEW
vhBW1/w&F #undef THIS_FILE
G^.N$wcv static char THIS_FILE[] = __FILE__;
DhE-g< #endif
b1C)@gl !Z #define MAX_KEY 100
afrF%! #define CTRLBIT 0x04
`;85Mo:qJ #define ALTBIT 0x02
4aHogheg #define SHIFTBIT 0x01
neFwxS? #pragma data_seg("shareddata")
oxxuw
Dcl HHOOK hHook =NULL;
'D21A8*N UINT nHookCount =0;
{;{U@Z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
rI>x'0Go* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
YY;<y%:8Z static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
N`W[Q>n static int KeyCount =0;
kyHli~Nr" static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
` @ QZK0Ox #pragma data_seg()
7${<u 0((! HINSTANCE hins;
<Z^by;d|z void VerifyWindow();
|0[Buh[_:c BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
~$y"Ldrp //{{AFX_MSG_MAP(CHookApp)
AQ)gj$
m3 // NOTE - the ClassWizard will add and remove mapping macros here.
6=f)3!= // DO NOT EDIT what you see in these blocks of generated code!
=+iY<~8 //}}AFX_MSG_MAP
qPPe)IM'Sc END_MESSAGE_MAP()
=mYf]
PIX q;68tEupR CHookApp::CHookApp()
B<d=;V {
LhL |ETrJ // TODO: add construction code here,
owIpn=8|Q // Place all significant initialization in InitInstance
fOi
Rstci }
]?}>D?5 VlV
X CHookApp theApp;
h%EeU
3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
S70#_{ {
[QnN1k BOOL bProcessed=FALSE;
"W(D0oy if(HC_ACTION==nCode)
g}W`LIasv {
I0mp [6 if((lParam&0xc0000000)==0xc0000000){// Key up
W]po RTJ: switch(wParam)
`0Udg,KOs {
b<tV>d"Fv case VK_MENU:
<D|&)/# MaskBits&=~ALTBIT;
mz0{eO break;
f\
P0% case VK_CONTROL:
k{2Gq1S{ MaskBits&=~CTRLBIT;
33~MP; break;
>` s"C case VK_SHIFT:
s*PKr6X+ MaskBits&=~SHIFTBIT;
<1*kXTN( break;
Tf3CyH!k default: //judge the key and send message
S/E&&{`ls break;
"WKOlfPa }
QATRrIj{e for(int index=0;index<MAX_KEY;index++){
Bc8&-eZ, if(hCallWnd[index]==NULL)
J.UNw8z continue;
{]\7
M|9\
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
wa@Rlzij> {
!Q>xVlPVu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
{ {\oC$ bProcessed=TRUE;
$UzSPhv[ }
EGl<oxL*R2 }
ZS.=GjK }
M@T{uo else if((lParam&0xc000ffff)==1){ //Key down
,NGHv?.N switch(wParam)
/bykIUTKI {
]zYIblpde case VK_MENU:
<,:{Q75 MaskBits|=ALTBIT;
X(tx8~z break;
e(s0mbJE case VK_CONTROL:
6_%Cd`4Z MaskBits|=CTRLBIT;
cq[9#@
4= break;
{YiMd
oMhg case VK_SHIFT:
jj`#;Y MaskBits|=SHIFTBIT;
N}5 break;
d}O\:\}y default: //judge the key and send message
2WS*c7Ct break;
&h/r]KrZ }
{z>!Fw for(int index=0;index<MAX_KEY;index++)
$6n
J+ {
wNUT0 + if(hCallWnd[index]==NULL)
My>q%lF=fw continue;
bpc1>? if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8oE`>Y {
J!om"h SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
sV#%U%un bProcessed=TRUE;
~Z5AIm R| }
G
y[5'J` }
L]MWdD }
K^!#;,0 if(!bProcessed){
$]LS!@ Rm for(int index=0;index<MAX_KEY;index++){
V<
F&\ if(hCallWnd[index]==NULL)
I3>8B continue;
N'y<<tTA if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
N7s0Ua'-v SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Gbhw7
(& }
- ;gQy[U }
'=;e#
C`<{ }
F`4W5~` return CallNextHookEx( hHook, nCode, wParam, lParam );
x:-NTW
-g }
:Fhk$?/r h2'6W) BOOL InitHotkey()
bf/6AY7 {
w!"A$+~ if(hHook!=NULL){
Y%/RGYKh nHookCount++;
4
Y=0>FlY0 return TRUE;
] !*K|?VL }
qeM DC#N else
,esEh5=Ir hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
m%.4OXX"& if(hHook!=NULL)
80Y%C-Y: nHookCount++;
qoZi1,i' return (hHook!=NULL);
s O#cJAfuu }
bqH
[-mu6 BOOL UnInit()
z9
0JZA {
P
DY :?/ if(nHookCount>1){
At@0G\^ nHookCount--;
rd&d~R6 return TRUE;
$W|JQ h }
,~cK]!:>s BOOL unhooked = UnhookWindowsHookEx(hHook);
6Mk#) ebM if(unhooked==TRUE){
; s(bd#Q nHookCount=0;
sq=EL+=j hHook=NULL;
b;
of9hY }
f&$Bjq return unhooked;
vFL$wr }
s 4rva G@a jUE:QOfRib BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>h8m8J {
J,,VKA& BOOL bAdded=FALSE;
9U; for(int index=0;index<MAX_KEY;index++){
XcNL\fl1 if(hCallWnd[index]==0){
"<|KR{/+ hCallWnd[index]=hWnd;
1M`>;fjYa HotKey[index]=cKey;
<SJ6<' HotKeyMask[index]=cMask;
7[=G;2< bAdded=TRUE;
n`^jNXE KeyCount++;
,JI] Eij^ break;
Zsapu1HoL\ }
lrc%GU): }
p[&Jl return bAdded;
S8qg"YR }
}Nn+Ny ,]\cf BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
P8=|#yCi {
`ZL^+h<b>M BOOL bRemoved=FALSE;
+E9G"Z65iP for(int index=0;index<MAX_KEY;index++){
&M5v EPR if(hCallWnd[index]==hWnd){
GTB\95j] if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}],l m hCallWnd[index]=NULL;
&wU"6E HotKey[index]=0;
(!@gm)#h HotKeyMask[index]=0;
:V6
[_VaF bRemoved=TRUE;
\
o2oQ3 KeyCount--;
I wj[ ^ break;
KRGj6g+ }
9.xb-m7 }
{
(.@bT@ }
>]_6|Wfl return bRemoved;
,L }
l'<&H#A;' QN;5+p[N void VerifyWindow()
Mm,\e6#* {
3 US`6Y" for(int i=0;i<MAX_KEY;i++){
r1q'+i if(hCallWnd
!=NULL){ =~D[M)UO|
if(!IsWindow(hCallWnd)){ A ___|
#R
hCallWnd=NULL; Ma\%uEgTD
HotKey=0; 5Kd"W,
HotKeyMask=0; t0cS.hi
KeyCount--; sh,4n{+
} 'r=2f6G>cP
} W 8`6O2
} hwk] ;6[
} >4bw4
Z1
X`<z5W] !
BOOL CHookApp::InitInstance() [pms>TQ2
{ s8A"x`5(
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^%%Rf
hins=AfxGetInstanceHandle(); "&XhMw4
InitHotkey(); (8~mf$ zx,
return CWinApp::InitInstance(); V* JqC
} #5y+gdN
8=bn
TJf
int CHookApp::ExitInstance() ^W}|1.uZ
{ #/I+[|=[O
VerifyWindow(); f.` 8vaV
UnInit(); q9x@Pc29d
return CWinApp::ExitInstance(); cl#XiyK>
} @Wd(>*"zw
"<Di
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C<C^7-5
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wGMoh.GTh
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <x$nw'H9
#if _MSC_VER > 1000 XU<owk
#pragma once h('5x,G%
#endif // _MSC_VER > 1000 'H`:c+KDG`
IW@xT@
class CCaptureDlg : public CDialog *:\[;69[
{ vS ( Y_6
// Construction ,;YNI
public: 3
u=\d)eq
BOOL bTray; rVhfj~Ts
BOOL bRegistered; `"'u
mIz
BOOL RegisterHotkey(); QgH{J80
UCHAR cKey; ekfa"X_
UCHAR cMask; ^Rl?)_)1HE
void DeleteIcon(); D:K"J><@
void AddIcon(); $EIKi'!8
UINT nCount; N:'GNMu
void SaveBmp(); YG?4DF
CCaptureDlg(CWnd* pParent = NULL); // standard constructor M-;MwLx
// Dialog Data Xa-TNnws?
//{{AFX_DATA(CCaptureDlg) u1kCvi#N
enum { IDD = IDD_CAPTURE_DIALOG }; *Q2 oc:6
CComboBox m_Key; _UP 9b@Z"
BOOL m_bControl; /Xc9}~t6
BOOL m_bAlt; ,;MUXCC'
BOOL m_bShift; N DI4EA~z
CString m_Path; 2N(Z^
CString m_Number; 3J8>r|u;1'
//}}AFX_DATA ADxje%!1O
// ClassWizard generated virtual function overrides 08AD~^^
//{{AFX_VIRTUAL(CCaptureDlg) TUGD!b{
public: 82)=#ye_P
virtual BOOL PreTranslateMessage(MSG* pMsg); X ?ZLmP7|
protected: US's`Ehx
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support * >2FcoN;
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _lT'nFe=Q
//}}AFX_VIRTUAL +F,])p4,]i
// Implementation z<P?p
protected: OP= oSfa
HICON m_hIcon; T6?03cSE
// Generated message map functions rkh%[o9"/
//{{AFX_MSG(CCaptureDlg) .`u8(S+
virtual BOOL OnInitDialog(); Bk~lM'
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %H_-`A`
afx_msg void OnPaint(); :
maBec)
afx_msg HCURSOR OnQueryDragIcon(); @b2?BSdUp
virtual void OnCancel(); SH"<f_
afx_msg void OnAbout(); um<$L
afx_msg void OnBrowse(); r.u\qPT&
afx_msg void OnChange(); 2u0B=0x
//}}AFX_MSG ETX>wZ
DECLARE_MESSAGE_MAP() AL&<SxuP
}; eC 2~&:$L
#endif sAjUX.c
jpXbFWgN
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9!r0uU"
#include "stdafx.h" f;+.j/ +
#include "Capture.h" ]4')H;'y
#include "CaptureDlg.h" @az<D7j2
#include <windowsx.h> $6ucz'
#pragma comment(lib,"hook.lib") oFt_ yU-
#ifdef _DEBUG h1B_*L
#define new DEBUG_NEW xe.f]a
#undef THIS_FILE 1NTx?JJfW
static char THIS_FILE[] = __FILE__; rHybP6C<
#endif l7<VH z0b
#define IDM_SHELL WM_USER+1 PktnjdFV
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p.MLKp-'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KqBiF]Q
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -W/D Cj<
class CAboutDlg : public CDialog 3*{l^<`:gA
{ #;1RStb:zj
public: @^#
9N!Fj]
CAboutDlg();
DHhty qm
// Dialog Data _BgWy#
//{{AFX_DATA(CAboutDlg) b9wC:NgQx
enum { IDD = IDD_ABOUTBOX }; ]f`UflMO8
//}}AFX_DATA F}F{/
// ClassWizard generated virtual function overrides s/3sOb}sA
//{{AFX_VIRTUAL(CAboutDlg) "N EKz
protected: 4__HH~j ?Q
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]$.w
I~J%
//}}AFX_VIRTUAL ^[+2P?^K
// Implementation "9~KVILlLu
protected: cYOcl-*af
//{{AFX_MSG(CAboutDlg) [%/B"wTt
//}}AFX_MSG N!tNRMTi
DECLARE_MESSAGE_MAP() Aj O{c=d
}; 64y9.PY
gC%$)4-:
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) cdI"=B+C\
{ 39~WP$GM
//{{AFX_DATA_INIT(CAboutDlg) &P*r66
//}}AFX_DATA_INIT Dl\0xcE
} 9Ns%<FRO@
;_ 1Rk&o!
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |<1A<fU8a
{ uTl"4;&j
CDialog::DoDataExchange(pDX); ,Cy&tRjR B
//{{AFX_DATA_MAP(CAboutDlg) m<;MOS
//}}AFX_DATA_MAP ulEtZ#O{_
} ~dgFr6
5YUe>P D
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) +,i_G?eX
//{{AFX_MSG_MAP(CAboutDlg) QD-Bt=S7l
// No message handlers MP
)nQ
//}}AFX_MSG_MAP r'|ei ,
END_MESSAGE_MAP() ,>kXn1 ,
]g%HU%R-m
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >*|Eyv_
: CDialog(CCaptureDlg::IDD, pParent) *Hv d
{ Pc+,iK>
//{{AFX_DATA_INIT(CCaptureDlg) zQGj,EAM}
m_bControl = FALSE; e-xT.RnQ
m_bAlt = FALSE; AXo)(\
m_bShift = FALSE; @P=n{-pIW
m_Path = _T("c:\\"); 6@d/k.3p
m_Number = _T("0 picture captured."); Y'}c$*OkI
nCount=0; xo-{N[r
bRegistered=FALSE; ]N1,"W}
bTray=FALSE; hbx+*KM
//}}AFX_DATA_INIT ,oEAWNbgQ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :^x,>(a
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); K)\D,5X^
} d(5j#?
p-z!i +
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) (f*r
{ Vrp]YRL`
CDialog::DoDataExchange(pDX); 7 lq$PsC
//{{AFX_DATA_MAP(CCaptureDlg) J|z ' <W
DDX_Control(pDX, IDC_KEY, m_Key); x;4m@)Mu
DDX_Check(pDX, IDC_CONTROL, m_bControl); g ZES}]N
DDX_Check(pDX, IDC_ALT, m_bAlt); xKT;1(Mk
DDX_Check(pDX, IDC_SHIFT, m_bShift); #TgP:t]p
DDX_Text(pDX, IDC_PATH, m_Path); {D]I[7f8Ev
DDX_Text(pDX, IDC_NUMBER, m_Number); COH.`Tv{*
//}}AFX_DATA_MAP #S|On[Q!
} h`tf!M D]
1bCS4fs^>
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) / pGx!
//{{AFX_MSG_MAP(CCaptureDlg) i-sm 9K'ns
ON_WM_SYSCOMMAND() k6;pi=sYNW
ON_WM_PAINT() $7Tj<;TV
ON_WM_QUERYDRAGICON() ]go.IfH
ON_BN_CLICKED(ID_ABOUT, OnAbout) nF
'U*
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :mdoGb$dr
ON_BN_CLICKED(ID_CHANGE, OnChange) V* ,u;*
//}}AFX_MSG_MAP b#S-u }1PE
END_MESSAGE_MAP() YIl,8!
z~
%!L*ec%,
BOOL CCaptureDlg::OnInitDialog() OJ7y
{ %VrMlG4hx
CDialog::OnInitDialog(); 2T"[$iH!7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); XpT})AV
ASSERT(IDM_ABOUTBOX < 0xF000); a7]Z_Gk
CMenu* pSysMenu = GetSystemMenu(FALSE); sJ_3tjs)
if (pSysMenu != NULL) kPnuU!
{ ]/mRMm9"3h
CString strAboutMenu; Yp$@i20
strAboutMenu.LoadString(IDS_ABOUTBOX); hSk
if (!strAboutMenu.IsEmpty()) hLyV'*}
{ 8PGuZw<
pSysMenu->AppendMenu(MF_SEPARATOR); ;s-fYS6(>{
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !Ome;gS)
} \JF 2'm\M
} ><)fK5x
SetIcon(m_hIcon, TRUE); // Set big icon ?bG82@-
SetIcon(m_hIcon, FALSE); // Set small icon j2 #B l
m_Key.SetCurSel(0); bWB&8&p
RegisterHotkey(); 7{[i)
CMenu* pMenu=GetSystemMenu(FALSE); .R@euIva
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3TKl
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EmV ZqW
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %bhFl,tL
return TRUE; // return TRUE unless you set the focus to a control >>>MTV f
} ,0n=*o@W
u z:@
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) )Mw 3ZE92
{ SsIN@
if ((nID & 0xFFF0) == IDM_ABOUTBOX) mZ#IP
{ NV3oJ0f&2
CAboutDlg dlgAbout; #@L<<Q8}
dlgAbout.DoModal();
t`x_@pr
} e/IVZmUn^
else 2-wgbC5
{ Uetna!ABB
CDialog::OnSysCommand(nID, lParam); Sr6?^>A@t
} bB.Yq3KI
} DJH,#re>
3>^S6h}o
void CCaptureDlg::OnPaint() l{3ZN"`I
{ jTok1k
if (IsIconic()) l @r`NFWD@
{ RgVg~?A@
CPaintDC dc(this); // device context for painting '/F~vSQsR
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #Xun>0
// Center icon in client rectangle !p70g0+
int cxIcon = GetSystemMetrics(SM_CXICON); xb^M33-y
int cyIcon = GetSystemMetrics(SM_CYICON); E._ [P/PB
CRect rect; fH_Xm :%
GetClientRect(&rect); I8:G:s:
int x = (rect.Width() - cxIcon + 1) / 2; X^.~f+d~
int y = (rect.Height() - cyIcon + 1) / 2; V} t8H
// Draw the icon J2$=H1-
dc.DrawIcon(x, y, m_hIcon); I,?!NzB
} 7FP
@ v ng
else +|spC
{ ; 5!8LmZ0#
CDialog::OnPaint(); ;:ocU?
} +hMF\@
} NJ!}(=1|K
D+Z,;XZ
HCURSOR CCaptureDlg::OnQueryDragIcon() vP/sG5$x
{ ; DI"9
return (HCURSOR) m_hIcon; g_MxG!+(V
} 2}#VB;B
-"n8Wv
void CCaptureDlg::OnCancel() >
,P,{"
{ SQf.R%cg$
if(bTray) a~`,zQ -@
DeleteIcon(); %A;s3]V
CDialog::OnCancel(); ?B:],aztf
} 4yR X{Bl|
a(+u"Kr
z
void CCaptureDlg::OnAbout() i8(n(
{ ~ouRDO
CAboutDlg dlg; vXcgl
dlg.DoModal(); c}#(,<8X
} @-}!o&G0
Z+! 96LR
void CCaptureDlg::OnBrowse() v|YJ2q?19
{ 7o`pNcabtz
CString str; PAy7b7m~B
BROWSEINFO bi; .h;X5q1
char name[MAX_PATH]; <p8>"~R
ZeroMemory(&bi,sizeof(BROWSEINFO)); (I(k$g[>
bi.hwndOwner=GetSafeHwnd(); 0,[-4m
bi.pszDisplayName=name; ${, !L l7)
bi.lpszTitle="Select folder"; m:5bb3
bi.ulFlags=BIF_RETURNONLYFSDIRS; 4fdO Ow
LPITEMIDLIST idl=SHBrowseForFolder(&bi); x9H
qc9q
if(idl==NULL) Gjf1Ba
return; %{";RfSVX%
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y t0s
str.ReleaseBuffer(); ;i;;{j@$i
m_Path=str; :<E\&6# oC
if(str.GetAt(str.GetLength()-1)!='\\') L~L]MC&
m_Path+="\\"; y O?52YO
UpdateData(FALSE); Zq"wq[GCN
} A/*h[N+2!
*Ja,3Qq
void CCaptureDlg::SaveBmp() 0'tm.,
{ n(el
CDC dc; /pnQKy.
dc.CreateDC("DISPLAY",NULL,NULL,NULL); zH?&FtO
CBitmap bm; \G &q[8F\
int Width=GetSystemMetrics(SM_CXSCREEN); 9 kS;_(DB
int Height=GetSystemMetrics(SM_CYSCREEN); 38(|a5
bm.CreateCompatibleBitmap(&dc,Width,Height); :vy./83W
CDC tdc; oJ)v6"j
tdc.CreateCompatibleDC(&dc); rZ7)sE5L
CBitmap*pOld=tdc.SelectObject(&bm); 3`Q>s;DjIU
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ),+u>Os&
tdc.SelectObject(pOld); I'16-
BITMAP btm; H.:
[#
a
bm.GetBitmap(&btm); D
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DWORD size=btm.bmWidthBytes*btm.bmHeight; 3`\)Qm
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X+k`UM~
BITMAPINFOHEADER bih; s2\6\8Ipn
bih.biBitCount=btm.bmBitsPixel; H3"D$Nv
bih.biClrImportant=0; s$;IR
c5!6
bih.biClrUsed=0; aQhr$aH
bih.biCompression=0; >d#6qXKAU
bih.biHeight=btm.bmHeight; } T<oLvS
bih.biPlanes=1; pNR69/wGi
bih.biSize=sizeof(BITMAPINFOHEADER); 1`8(O >5
bih.biSizeImage=size; <\S
j5
bih.biWidth=btm.bmWidth; z[ N_3n
bih.biXPelsPerMeter=0; ZE>!]# ,
bih.biYPelsPerMeter=0; wKs-<b%;
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Yo#F ;s7
static int filecount=0; 0_5j(
CString name; 7u7 <"?v=
name.Format("pict%04d.bmp",filecount++); -)ag9{ *
name=m_Path+name; H>2f M^
BITMAPFILEHEADER bfh; 7Ke#sW.HN
bfh.bfReserved1=bfh.bfReserved2=0; |MXv
w6P
bfh.bfType=((WORD)('M'<< 8)|'B'); 4 jeUYkJUM
bfh.bfSize=54+size; K=C).5=U
bfh.bfOffBits=54; z@S39Xp==
CFile bf; j{a3AEmps
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ iVGc\6+'
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *Ad7GG1/u
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); yS:1F
PA$_
bf.WriteHuge(lpData,size); -a$7b;gF
bf.Close(); XZ8;Ow=
nCount++; mh8~w~/[
} aF\?X&|
GlobalFreePtr(lpData); We*)RXm%
if(nCount==1) n/]$k4h
m_Number.Format("%d picture captured.",nCount); Yl6\}_h`
else g$ oe00b
m_Number.Format("%d pictures captured.",nCount); )z#M_[zC>
UpdateData(FALSE); ]w=6.LzO*
} juuV3et
iy_\1jB0
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \3@A C7
{ r'ydjy
if(pMsg -> message == WM_KEYDOWN) 8QGj:3
{ 'qg q8
if(pMsg -> wParam == VK_ESCAPE) !zNMU$p
return TRUE; C=/nZGG
if(pMsg -> wParam == VK_RETURN) #dgWXO
return TRUE; D%Y{(l+X
} z3[0BWXs
return CDialog::PreTranslateMessage(pMsg); -f-2!1&<3h
} :J}@*>c
8HLcDS#
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7E9h!<5v
{ .1F^=C.w
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ H19CVc\B
SaveBmp(); 61J01(+|
return FALSE; x@]pUA1
} 6A& f
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k&1~yW
CMenu pop; '.wyfS H@
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y[l19eU
CMenu*pMenu=pop.GetSubMenu(0); RZ[r XV5
pMenu->SetDefaultItem(ID_EXITICON); )ccdfSe
CPoint pt; 4%I(Z'*Cx
GetCursorPos(&pt); FT*
o;&_QS
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); jbqhNsTNK
if(id==ID_EXITICON) X=p~`Ar M{
DeleteIcon(); -R;.Md_
else if(id==ID_EXIT) WM}bM]oe
OnCancel(); WqC6c&NM
return FALSE; TvWhy`RQ
} ;mLbJT
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2Ax HhD.
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Tdr^~dcQ
AddIcon(); [-sE:O`yt
return res; [N/[7Q/y
} @:. 6'ji,`
gi7As$+E
void CCaptureDlg::AddIcon() n8M/Y}mH
{ M,Px.@tw.
NOTIFYICONDATA data; *s6MF{Ds
data.cbSize=sizeof(NOTIFYICONDATA); |^ml|cb
CString tip; zSYWNmj&
tip.LoadString(IDS_ICONTIP); iD|"} }01
data.hIcon=GetIcon(0); PaEsz$mgy
data.hWnd=GetSafeHwnd(); t
_Q/v
strcpy(data.szTip,tip); x=qACoq
data.uCallbackMessage=IDM_SHELL; jBEt!Azur
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 15r<n
data.uID=98; `
m`Sl[6
Shell_NotifyIcon(NIM_ADD,&data); Iy](?b
ShowWindow(SW_HIDE); E$FXs~a
bTray=TRUE; `oh'rm3'8
} -NVk>ENL4
T!hU37g h?
void CCaptureDlg::DeleteIcon() 2f]9I1{
{ NDRk%_Eu(
NOTIFYICONDATA data; O329Bkg
data.cbSize=sizeof(NOTIFYICONDATA); 4.3Bz1p
data.hWnd=GetSafeHwnd(); 'sm+3d
data.uID=98; VPf*>ph=
Shell_NotifyIcon(NIM_DELETE,&data); (o\:rLZu
ShowWindow(SW_SHOW); @Ns^?#u~
SetForegroundWindow(); m4nJ9<-
ShowWindow(SW_SHOWNORMAL); xnu|?;.}!
bTray=FALSE; +MQf2|--
} A;h0BQm/j
I ,AI$A
void CCaptureDlg::OnChange() 3yXF|
yV
{ &,fBg6A%
RegisterHotkey(); ?#\?&uFJ}
} SF;;4og
8jjJ/Mz`
BOOL CCaptureDlg::RegisterHotkey() -{ZTp8P>
{ AdB5D_ Ir
UpdateData(); .l*]W!L]
UCHAR mask=0; j~"X`: =
UCHAR key=0; fh
\<tnY
if(m_bControl) 7fl'nCo\"
mask|=4; y-"*[5{W
if(m_bAlt) Gr#p QE2;
mask|=2; UsYH#?|O
if(m_bShift) 5RTAM
mask|=1; %.b)%=
key=Key_Table[m_Key.GetCurSel()]; ;=Bf&hY&
if(bRegistered){ -Tk~c1I#`
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6[c
LbT0
bRegistered=FALSE; $+ZO{
(
} Gn;eh~uw;l
cMask=mask; +
&b`QcH<
cKey=key; `ivr$b#
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^<<( }3
return bRegistered; [(`T*c.#.X
} 5\f*xY
qB7.LR*'
四、小结 DSy,#yA
/Yx 1S'5
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。