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:
j1Ng[
CLn}BxgD 一、实现方法
M@TXzn!&o @0v%5@ 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:
$>Mqo \NgBF #pragma data_seg("shareddata")
#<4/ * < 5 HHOOK hHook =NULL; //钩子句柄
<
.\2Ec UINT nHookCount =0; //挂接的程序数目
FxK2 1 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
S8S<>W static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
,xhB static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
^y1P~4w? static int KeyCount =0;
+CQ$-3 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
7?[{/`k~? #pragma data_seg()
)|Il@unp/ 8Ev,9 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。
[Y%H8} &OXnZT3P 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:
)9PP3" I N.l\2S} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
5VLJ:I?0O cKey,UCHAR cMask)
<}vult^ {
#("/ 1N6 BOOL bAdded=FALSE;
@An "ClDa for(int index=0;index<MAX_KEY;index++){
n}f*>Mn if(hCallWnd[index]==0){
mqIcc'6f hCallWnd[index]=hWnd;
qad`muAd HotKey[index]=cKey;
ruf*-&Kr7 HotKeyMask[index]=cMask;
uFXu9f+ bAdded=TRUE;
Gl@-RLo KeyCount++;
/-mo8]J#2~ break;
E+tV7xa~ }
`g~T #U\>d }
S,'y
L7s return bAdded;
~"t33U6 }
faqh }4 //删除热键
(:TZ~"VY BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
;OTd< {
piy_9nk BOOL bRemoved=FALSE;
;FI"N@z for(int index=0;index<MAX_KEY;index++){
+OTNn@!9 if(hCallWnd[index]==hWnd){
#xlT,:_:) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
p2\mPFxEP hCallWnd[index]=NULL;
uPvE;E_ HotKey[index]=0;
\{Yi7V
Xv HotKeyMask[index]=0;
.dr-I7&! bRemoved=TRUE;
1~|o@CO KeyCount--;
8}A+{xVp8 break;
%YhM?jMW }
0IP5&[-P }
*fIb|r }
*It`<F| return bRemoved;
R{X@@t9@ }
tsqkV7? XXe?@w2{ FVw4BUOmi DLL中的钩子函数如下:
:v(fgS2\
-9(9LU2 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
0~;Owu {
SZ*Nr=X BOOL bProcessed=FALSE;
P%nN#Qm if(HC_ACTION==nCode)
lZI?k=rWv {
m%[Ul@!V if((lParam&0xc0000000)==0xc0000000){// 有键松开
MD62ObK! switch(wParam)
=;!$Qw4 {
|oL}c!0vs case VK_MENU:
=MP?aH
[ MaskBits&=~ALTBIT;
Js706 break;
[*jvvkAp case VK_CONTROL:
hh$V[/iK MaskBits&=~CTRLBIT;
M|l`2Hpe break;
> 0kZ-M5 case VK_SHIFT:
k>ERU]7[ MaskBits&=~SHIFTBIT;
Te :4z@? break;
L]_1z default: //judge the key and send message
1lf5xm. break;
10C,\ }
vp#A D9h1 for(int index=0;index<MAX_KEY;index++){
At?]FjL6S if(hCallWnd[index]==NULL)
<Y9 L3O`[ continue;
x9NcIa9 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
T]#S=]G {
<NVSF6` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
IL\2?(&Z bProcessed=TRUE;
1J
tt\yq }
I<["ko,t@? }
~53uUT|B }
y!,Ly_x$@ else if((lParam&0xc000ffff)==1){ //有键按下
$^ wqoW%t switch(wParam)
#"6O3.P {
c[h{C!d1 case VK_MENU:
DviR D[+q" MaskBits|=ALTBIT;
w}`TJijl break;
uq~Z case VK_CONTROL:
pm.Zc'23
MaskBits|=CTRLBIT;
\*(A1Vk break;
>&mNC\PA case VK_SHIFT:
2A5R3x=\ MaskBits|=SHIFTBIT;
{ !;I4W%! break;
bIR&e E default: //judge the key and send message
04u^Q break;
Yr\pgK, }
WLB@]JvTBY for(int index=0;index<MAX_KEY;index++){
*T+Bjj;w if(hCallWnd[index]==NULL)
^Qx
qv continue;
."u-5r<O if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{4%B^+}T
{
VXM5
B SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
]V4Fm{] bProcessed=TRUE;
?$>#FKrt }
p#yq 'kY }
hS?pc<~`# }
@`,~d{ziF if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
m4=[e! for(int index=0;index<MAX_KEY;index++){
G1vg2'A if(hCallWnd[index]==NULL)
d[p-zn. continue;
lhN2xg5x if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
fs:%L SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9Ez>srH( //lParam的意义可看MSDN中WM_KEYDOWN部分
m#^ua^JV }
mw[T[ }
1hz:AUH }
~o+:M0)} return CallNextHookEx( hHook, nCode, wParam, lParam );
3[RP:W@% }
^iHwv*ss 9ozK}Cg4 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:
5f` a7R }u>F}mUa BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
s.zfiJ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
C`++r> N>+s8L.? 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:
;VLv2J* U)PNY LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
S~ff<A>f {
;`{PA
!> if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
_N-.=86* {
C,;hNg[ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
06Irx^n SaveBmp();
na5:)j4< return FALSE;
oC~8h8"l }
(F<VcB …… //其它处理及默认处理
{1<XOp#b }
5q.d$K | {DI`HB[ L$Uy 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。
FRSz3^A w %y{f]m 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。
cEP!DUo o9j*Yz 二、编程步骤
gG 9e.++: 5Oa`1?C1 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";
R.Plfm06Ue "<#-#j 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
WRq:xDRn0 7jj.maK 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;
h6yXW!8 &pL.hM^ 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;
:75$e%'A gH0'
Ok' 5、 添加代码,编译运行程序。
7lC ); j[^(<R8 三、程序代码
a-A>A_. ']bpsn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
s!vvAD;\ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
]ZkR~? #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<~%e{F:[# #if _MSC_VER > 1000
,C=Lu9 #pragma once
sULCYiT|Hn #endif // _MSC_VER > 1000
g}cb>'=={ #ifndef __AFXWIN_H__
W-pN #error include 'stdafx.h' before including this file for PCH
h~!KNF*XW #endif
S\,~6]^T #include "resource.h" // main symbols
^AI5SjOUx class CHookApp : public CWinApp
];3]/b)& {
56|o6-a^ public:
^PNE6 CHookApp();
xg|\\i // Overrides
Y<x;-8)* // ClassWizard generated virtual function overrides
#><P28m //{{AFX_VIRTUAL(CHookApp)
]uikE2nn public:
jHU5>Gt-} virtual BOOL InitInstance();
ja<!_^h=At virtual int ExitInstance();
5i<E AKL //}}AFX_VIRTUAL
p#]D-?CM) //{{AFX_MSG(CHookApp)
E`"<t:RzF // NOTE - the ClassWizard will add and remove member functions here.
c}QWa"\2n // DO NOT EDIT what you see in these blocks of generated code !
lBYc(cr //}}AFX_MSG
feSj3,<! DECLARE_MESSAGE_MAP()
\V1geSoE };
4
8}\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
$N}nO:`t BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ZFJqI BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
o'Uaz*-po BOOL InitHotkey();
_3;vir%) BOOL UnInit();
Epl\( #endif
K5h2 ~ |4slG //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
LNA5!E #include "stdafx.h"
_gLj(<^9 #include "hook.h"
U= Gw( #include <windowsx.h>
MeP,8,n' #ifdef _DEBUG
".Z1CBM( #define new DEBUG_NEW
<kmH^viX #undef THIS_FILE
(= T%eJ61 static char THIS_FILE[] = __FILE__;
ytWTJ>L #endif
{mkD{2)KQ #define MAX_KEY 100
,?3)L
#define CTRLBIT 0x04
Oi?+Z:lak #define ALTBIT 0x02
}[$qn| #define SHIFTBIT 0x01
$4*wK@xu #pragma data_seg("shareddata")
.# Jusd HHOOK hHook =NULL;
FC+}gJ(q UINT nHookCount =0;
6]Vf`i static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
&f;<[_QI= static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
RTLA* static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
>" z$p@7 static int KeyCount =0;
:vsF4 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
dYEsSFB m #pragma data_seg()
MnQ4,+ji- HINSTANCE hins;
k|r+/gIV void VerifyWindow();
-;i vBR BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
0bcbH9) 1q //{{AFX_MSG_MAP(CHookApp)
<%SG
<|t // NOTE - the ClassWizard will add and remove mapping macros here.
`veq/! // DO NOT EDIT what you see in these blocks of generated code!
n/&}|998? //}}AFX_MSG_MAP
Cuk!I$ END_MESSAGE_MAP()
DJ!<:9FD R)>F*GsR CHookApp::CHookApp()
?}n\&|+ {
19g-#H! // TODO: add construction code here,
A~!v+W%vO1 // Place all significant initialization in InitInstance
.!B>pp(9 }
(FY<%.Pa ri]"a?Rm CHookApp theApp;
ac2G;}B| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Rg3cqe#O/ {
mF6 U{= BOOL bProcessed=FALSE;
5, j&-{0W if(HC_ACTION==nCode)
*!wBn {
;7HL/- if((lParam&0xc0000000)==0xc0000000){// Key up
C<T)'^7z switch(wParam)
w.:fl4V {
g.V{CJ*V case VK_MENU:
^wtr~D| MaskBits&=~ALTBIT;
pE~>k: break;
^@4$O|3Wh' case VK_CONTROL:
H[u[3 MaskBits&=~CTRLBIT;
WlF}R\N! break;
T\
cJn>kCn case VK_SHIFT:
Cb1fTl% MaskBits&=~SHIFTBIT;
4(hHp6}b break;
5LF#w_x default: //judge the key and send message
zYz0R:@n+ break;
0C,2gcq }
M?nYplC for(int index=0;index<MAX_KEY;index++){
,~TV/l< if(hCallWnd[index]==NULL)
3lw8%QD> continue;
c:@lR/oe" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
8etNS~^ {
!e0OGf SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Jq1^}1P bProcessed=TRUE;
9[9
ZI1*s }
mjI
$z3 }
U7(t >/ }
mT3'kUZ}] else if((lParam&0xc000ffff)==1){ //Key down
z+=wql*Eo switch(wParam)
#K4lnC2qz {
>}p'E9J?r case VK_MENU:
4Gsbcl{ MaskBits|=ALTBIT;
B.T|e,g26 break;
+YNN$i case VK_CONTROL:
i+Fk MaskBits|=CTRLBIT;
Vlka+$4! break;
4kr! Af case VK_SHIFT:
*.2[bQL@v MaskBits|=SHIFTBIT;
rmq^P;At break;
]rY3bG'& default: //judge the key and send message
03$lg DQ break;
`Cv@16 }
"(QI7:iM for(int index=0;index<MAX_KEY;index++)
tnn,lWu| {
zNo(|;19 if(hCallWnd[index]==NULL)
,xzSFs>2 continue;
@Q%g#N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
s7(I {
,RYahu SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Li{R?Osx bProcessed=TRUE;
8K;wX%_, }
h88IP:bo }
Y;B#_}yF }
f'-)
3T if(!bProcessed){
8A,="YIt for(int index=0;index<MAX_KEY;index++){
t)62_nu if(hCallWnd[index]==NULL)
Qt
VZ)777 continue;
.zM M!l3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
6tDCaB SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
NA<6s]Cs. }
gT=RJB }
Sd\+f6x }
b- FJMY return CallNextHookEx( hHook, nCode, wParam, lParam );
wvuh }
B+pJWl8u J_tI]?jrU BOOL InitHotkey()
l4LowV7 {
U*R if(hHook!=NULL){
}w%W A&"W nHookCount++;
sP`
k{xG return TRUE;
$mF(6<w }
Ozo)} else
B*,Qw_3dG hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
,iYKtS3 if(hHook!=NULL)
;A3aUN;"I nHookCount++;
Cjn)`Q8 return (hHook!=NULL);
M%#H>X\/ }
|TE\ ] BOOL UnInit()
6Y-sc*5 {
SaA9)s if(nHookCount>1){
i(pevu nHookCount--;
|#rP~Nj) return TRUE;
<zdo%~ba }
P?Fm<s: BOOL unhooked = UnhookWindowsHookEx(hHook);
s(3iGuT if(unhooked==TRUE){
/EXubU73 nHookCount=0;
L3
VyW8Y hHook=NULL;
l*0`{R }
A>OGU ^ return unhooked;
%J
'RO }
\NN5'DBx [ ]LiL;A& BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"p[FFg {
320g!r BOOL bAdded=FALSE;
?->&)oAh for(int index=0;index<MAX_KEY;index++){
VdfV5" if(hCallWnd[index]==0){
pSml+A: hCallWnd[index]=hWnd;
ap%
Y} HotKey[index]=cKey;
h4 X > HotKeyMask[index]=cMask;
H>/LC* 8- bAdded=TRUE;
MY$-D+#/` KeyCount++;
RE?j)$y?` break;
4t<l9Ilp }
AWqc?K@ }
|!=KLJUA return bAdded;
s/=.a2\ }
^HM9'*&KJ B<A=U r BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
iO?Sf8yJ: {
*?Pbk+}% BOOL bRemoved=FALSE;
%!_%%p,f for(int index=0;index<MAX_KEY;index++){
"k%B;!We) if(hCallWnd[index]==hWnd){
9"TPAywd if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
#ivN-WKCl hCallWnd[index]=NULL;
/j`vN HotKey[index]=0;
f|&ga'5g& HotKeyMask[index]=0;
iOO1\9{@ bRemoved=TRUE;
uSRvc0R\ KeyCount--;
'J=knjAT break;
6'^Gh B }
UVIR
P# }
+#/`4EnI }
O@gHx! L return bRemoved;
\a|bx4M }
1sHaG =yZiBJ void VerifyWindow()
01-n_ $b {
nnm9pnx for(int i=0;i<MAX_KEY;i++){
Oy `2ccQ# if(hCallWnd
!=NULL){ z12c9k%s
if(!IsWindow(hCallWnd)){ YV 5kzq
hCallWnd=NULL; M\f1]L|8d
HotKey=0; fcC?1M[BP~
HotKeyMask=0; 5jYZ+OB
KeyCount--; ;J)8#|
} 7rdPA9
} mAFVjSa2
} npW1Z3n
} /h!Y/\ kI
"V:24\vO
BOOL CHookApp::InitInstance() <f'2dT@6
{ xg>AW Q
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Yiq8>|
hins=AfxGetInstanceHandle(); s=uWBh3J
InitHotkey(); h{sY5d'D
return CWinApp::InitInstance(); LE"t'R
} Y.<&phv
J3$Ce%<
int CHookApp::ExitInstance() KP[H&4eoC
{ #Ang8O@y
VerifyWindow(); #O
|Z\|n
UnInit(); mOUIGlv
return CWinApp::ExitInstance(); U/|H%b
} u7Xr!d+wR
#78P_{#!
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s|1BqoE
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k$hNibpkt
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Nd"Rt
#if _MSC_VER > 1000 U;_b4S:
#pragma once ,3zF_y(*Y
#endif // _MSC_VER > 1000 V@(7K0
ARZ5r48)
class CCaptureDlg : public CDialog $|2@of.
{ "?lm`3W"
// Construction @"`{gdB$
public: 2`o}neF{
BOOL bTray; J01Y%W
BOOL bRegistered; #e!4njdM
BOOL RegisterHotkey(); ;I#S m;
UCHAR cKey; x 7;Zwd
UCHAR cMask; y,*>+xk,
void DeleteIcon(); _uR-Z_z
void AddIcon(); ~[CtsCiQ
UINT nCount; {\?zqIM
void SaveBmp(); #()u=)
CCaptureDlg(CWnd* pParent = NULL); // standard constructor g]z[!&%Ahs
// Dialog Data %>cl0W3x
//{{AFX_DATA(CCaptureDlg) B~/LAD_
enum { IDD = IDD_CAPTURE_DIALOG }; _V9 O,"DDc
CComboBox m_Key; tkG0xRH
BOOL m_bControl; H8ws6}C
BOOL m_bAlt; C XQPbt[5
BOOL m_bShift; 4@wH4H8
CString m_Path; F=29"1 ._
CString m_Number; M=!RJ%6f
//}}AFX_DATA u7e g:0Y
// ClassWizard generated virtual function overrides e*Gm()Vu,
//{{AFX_VIRTUAL(CCaptureDlg) e$E~@{[1)
public: Y!kz0([
virtual BOOL PreTranslateMessage(MSG* pMsg); C^hHt,&
protected: x=>+.'K
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;?y*@*2u
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5PJB<M_m:
//}}AFX_VIRTUAL &?@gUk74"
// Implementation 6;lJs,I1w{
protected: PC_#kz
HICON m_hIcon; ? 9.V@+i
// Generated message map functions $>3/6(bW
//{{AFX_MSG(CCaptureDlg) #nE%.k|R~
virtual BOOL OnInitDialog(); 9q2 >_Mv
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UH<nc;.B
afx_msg void OnPaint(); Q}J'S5%
afx_msg HCURSOR OnQueryDragIcon(); Sd3KY9,
virtual void OnCancel(); 4DVkycM
afx_msg void OnAbout(); u#8J`%g
afx_msg void OnBrowse(); OAc*W<Q0
afx_msg void OnChange(); 1$q>\
//}}AFX_MSG 1`tE Hu.
DECLARE_MESSAGE_MAP() LvJ')HG
}; ?Jlz{ms I
#endif Ty"OJ
&=sVq^d@qe
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s<I[)FQVr
#include "stdafx.h" qNhQ2x\
#include "Capture.h" 959i2z
#include "CaptureDlg.h" )
#/@Jo2F
#include <windowsx.h> |k wkikGQS
#pragma comment(lib,"hook.lib") qzVmsxBNP
#ifdef _DEBUG y&0&K4aa
#define new DEBUG_NEW 9E (VU.
#undef THIS_FILE 8 oHyNo
static char THIS_FILE[] = __FILE__; h^P>,dy0
#endif wl{Fx+<^3
#define IDM_SHELL WM_USER+1 U}xQUFT|
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !@ml^&hP
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aW8Bx\q
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ?-g=Rfpag
class CAboutDlg : public CDialog y)W.xR
{ Ge+&C RhyX
public: W^2Q"c#7F
CAboutDlg(); {d\erG(
// Dialog Data kU8V,5
//{{AFX_DATA(CAboutDlg) )$/Gh&1G
enum { IDD = IDD_ABOUTBOX }; 2&E1) ^
//}}AFX_DATA 1NO<K`
// ClassWizard generated virtual function overrides ExDH@Lb
//{{AFX_VIRTUAL(CAboutDlg) J}7iXTh
protected: \o^M ,yI
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support eH2.,wY1
//}}AFX_VIRTUAL %d+:0.+`n
// Implementation IBx?MU#.
protected: ?-,v0#
//{{AFX_MSG(CAboutDlg) V8>%$O
sw
//}}AFX_MSG =nEl m*E
DECLARE_MESSAGE_MAP() _wWh7'u~G
}; b;&J2:`
(9h{7<wD`
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) C#X0Cn0ln
{ A2z%zMlZc
//{{AFX_DATA_INIT(CAboutDlg) B.&ly/d
//}}AFX_DATA_INIT ;l_%;O5
} ,Cg uY/y
H&65X
void CAboutDlg::DoDataExchange(CDataExchange* pDX) . `lcxC
{ =6t)-53
CDialog::DoDataExchange(pDX); :K&
//{{AFX_DATA_MAP(CAboutDlg) E[J7FgU)<S
//}}AFX_DATA_MAP tr2@{xb
} M:W9h+z
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0X\,!FL
//{{AFX_MSG_MAP(CAboutDlg) >2gemTy
// No message handlers vN%zk(?T
//}}AFX_MSG_MAP n
5NkjhP~Z
END_MESSAGE_MAP() w\pD'1e
QQKvy0?1
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Cw]Q)rX{
: CDialog(CCaptureDlg::IDD, pParent) JBdZ]
{ 0@E[IDmp
//{{AFX_DATA_INIT(CCaptureDlg) \GeUX<Fl
m_bControl = FALSE; -OZRSjmY
m_bAlt = FALSE; 5gg_c?Vh/
m_bShift = FALSE; @`U78)]
m_Path = _T("c:\\"); %@L(A1"#D
m_Number = _T("0 picture captured."); lhAwTOn`Q
nCount=0; t&u,Od
bRegistered=FALSE; GLA,,i'i9
bTray=FALSE; `gy]|gS#b
//}}AFX_DATA_INIT -p`hevRr
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 KcVCA
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w,]cFT
} ,,oiL
p"/1Kwqx
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 'DlY8rEGP
{ (F_Wys=6
CDialog::DoDataExchange(pDX); E9{Gaa/{
//{{AFX_DATA_MAP(CCaptureDlg) 6q?C"\_
DDX_Control(pDX, IDC_KEY, m_Key); no+{9Uf
DDX_Check(pDX, IDC_CONTROL, m_bControl); %;9f$:U
DDX_Check(pDX, IDC_ALT, m_bAlt); !z X`M1J
DDX_Check(pDX, IDC_SHIFT, m_bShift); eKpH|S!xU
DDX_Text(pDX, IDC_PATH, m_Path); yNAvXkp
DDX_Text(pDX, IDC_NUMBER, m_Number); XU.ZYYZ=
//}}AFX_DATA_MAP ghJ81
} o"t+G/M
-MoI{3a
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j& f-yc'i-
//{{AFX_MSG_MAP(CCaptureDlg) m2%uGqz
ON_WM_SYSCOMMAND() N(Us 9
ON_WM_PAINT() 5xP\6Nx6&5
ON_WM_QUERYDRAGICON() *G$tfb(
ON_BN_CLICKED(ID_ABOUT, OnAbout) [V()7
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UaCEh?D+Y
ON_BN_CLICKED(ID_CHANGE, OnChange) wFpt#_fS
//}}AFX_MSG_MAP c+#GX)zh\G
END_MESSAGE_MAP() TPp%II'*
L #p-AK
BOOL CCaptureDlg::OnInitDialog() c]F$$BT
{ di`Ql._M
CDialog::OnInitDialog(); oddS~lW
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ofl3G
{u
ASSERT(IDM_ABOUTBOX < 0xF000); {hK$6bD3^
CMenu* pSysMenu = GetSystemMenu(FALSE); :*#AJV)
if (pSysMenu != NULL) pox\Gu~.0
{ .Xh ^L
CString strAboutMenu; "$PbpY
strAboutMenu.LoadString(IDS_ABOUTBOX); ;PI=jp
if (!strAboutMenu.IsEmpty()) /iNCb&[
{ ROr$S z
pSysMenu->AppendMenu(MF_SEPARATOR); ;JA2n\iP,
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I-4csw<Qy
} gIep6nq1`|
} BqK|4-Pf
SetIcon(m_hIcon, TRUE); // Set big icon k}l5v)m
SetIcon(m_hIcon, FALSE); // Set small icon e{.2*>pH
m_Key.SetCurSel(0); "m ):"
RegisterHotkey(); c[?S}u|['
CMenu* pMenu=GetSystemMenu(FALSE); nK1XJp
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l%.3hId-
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }m/aigA[1
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d~uK/R-KD
return TRUE; // return TRUE unless you set the focus to a control ZT95g
} m C_v!nL.
tTe\#o`
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &CF74AN#
{ cysYjuI i
if ((nID & 0xFFF0) == IDM_ABOUTBOX) :gVz}/C.@
{ il\#R%';5
CAboutDlg dlgAbout; Lo @mQ
dlgAbout.DoModal(); 0@{K'm/
} X !NH?0)
else ;2kiEATQ
1
{ UL$^zR3%d
CDialog::OnSysCommand(nID, lParam); "lx}.
} o\1"ux;b
} jwyJ=W-
;o_4)+}
void CCaptureDlg::OnPaint() .
[+ObF9=
{ Y(78qs1w
if (IsIconic()) ' ~ lC85
{ YN9ug3O+
CPaintDC dc(this); // device context for painting FVT_%"%C9
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]pl g@
// Center icon in client rectangle '81$8xxdY
int cxIcon = GetSystemMetrics(SM_CXICON); ,sP7/S)FR
int cyIcon = GetSystemMetrics(SM_CYICON); qbu Lcy3
CRect rect; #* j
GetClientRect(&rect); cG6Q$
int x = (rect.Width() - cxIcon + 1) / 2; 1$?O5.X:
int y = (rect.Height() - cyIcon + 1) / 2; 5W>i'6*
// Draw the icon ypwVzCUG
dc.DrawIcon(x, y, m_hIcon); Duj9PV`2
} K=M5d^K<E
else NtkEb :
{ .<^dv?@
CDialog::OnPaint(); X3".
} ZGSb&!Ke
} R0_%M
X3%7VFy9
HCURSOR CCaptureDlg::OnQueryDragIcon() U%"c@%B0
{ BM&95p
return (HCURSOR) m_hIcon; ~0>g 4
D.
} zGj0'!!-
8<Asg2]6
void CCaptureDlg::OnCancel() -uqJ~g D
{ c_x6FoE;L
if(bTray) ;gTdiwfgZ=
DeleteIcon(); 25t2tj@S
CDialog::OnCancel(); ?W1(
@.
} E).Nu
L,p5:EW8.
void CCaptureDlg::OnAbout() [m?eSq6e2b
{ {[61LQ6V9
CAboutDlg dlg; o?b$}Qrl
dlg.DoModal(); P-ys$=
} -wvrc3F
NwIl~FNK
void CCaptureDlg::OnBrowse() `]_#_
{ VT?JTW
CString str; tmDI2Z%7
BROWSEINFO bi; ]L^X}[SH
char name[MAX_PATH]; l131^48U
ZeroMemory(&bi,sizeof(BROWSEINFO)); 5Lo{\7%
bi.hwndOwner=GetSafeHwnd(); )/HSt%>
bi.pszDisplayName=name; &`0y<0z
bi.lpszTitle="Select folder"; Z 3m5D K
bi.ulFlags=BIF_RETURNONLYFSDIRS; L10Vq}W"
LPITEMIDLIST idl=SHBrowseForFolder(&bi); qi;@A-cq
if(idl==NULL) Pan^@B=Q
return; ha1 J^e
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q!$ZBw-7>A
str.ReleaseBuffer(); m!er"0
m_Path=str; pi q%b]
if(str.GetAt(str.GetLength()-1)!='\\') I?lQN$A.E
m_Path+="\\"; aDm$^yP
UpdateData(FALSE); ,jQkR^]j-
} -1Yt3M&
j0>S)Q
void CCaptureDlg::SaveBmp() 3P\#moJ
{ p
)etl5
CDC dc; ba1zu|@w
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6vQAeuz<Fq
CBitmap bm; KVvIo1$N
int Width=GetSystemMetrics(SM_CXSCREEN); MScjq
int Height=GetSystemMetrics(SM_CYSCREEN); iS&fp[Th
bm.CreateCompatibleBitmap(&dc,Width,Height); 8&qCH>Cf
CDC tdc; t(?m!Z?tb
tdc.CreateCompatibleDC(&dc); eVjr/nm
CBitmap*pOld=tdc.SelectObject(&bm); 2BS2$#c>
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); S)C =Q~&
tdc.SelectObject(pOld); T12?'JL^r
BITMAP btm; n9<QSX&~<
bm.GetBitmap(&btm); e]!C
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DWORD size=btm.bmWidthBytes*btm.bmHeight; P+:FiVj@~
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &1ASWllD
BITMAPINFOHEADER bih; kn 5q1^
bih.biBitCount=btm.bmBitsPixel; m4<8v
bih.biClrImportant=0; usZmf=p-r
bih.biClrUsed=0; ,v4Z[ (
bih.biCompression=0; X4!`
V?
bih.biHeight=btm.bmHeight; F6dm_Oq&
bih.biPlanes=1; ~QJD.'z
bih.biSize=sizeof(BITMAPINFOHEADER); !sfOde)$
bih.biSizeImage=size; 8E H#IiP
bih.biWidth=btm.bmWidth; sycN
bih.biXPelsPerMeter=0; u3R0_8
_.w
bih.biYPelsPerMeter=0; 9IIQon
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Vz1ro
static int filecount=0; lj/?P9
CString name; i*:lZ eU61
name.Format("pict%04d.bmp",filecount++); v}Gq.(b
name=m_Path+name; j/TsHJ=
BITMAPFILEHEADER bfh; >k<.bEx(A
bfh.bfReserved1=bfh.bfReserved2=0; Us+|L |/
bfh.bfType=((WORD)('M'<< 8)|'B'); rV<yM$IA
bfh.bfSize=54+size; b7E= u0
bfh.bfOffBits=54; Bcg\p}
CFile bf; '!]ry<
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ oL1m<cQo9
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); eh2 w7@7Q
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,DqI> vx|
bf.WriteHuge(lpData,size); n,hHh=.Fu
bf.Close(); H^_[nL
nCount++; 3;Kv9i<~LE
} G#ZU^%$M,
GlobalFreePtr(lpData); uhSRl~tn
if(nCount==1) j2} C
m_Number.Format("%d picture captured.",nCount); ,'v ]U@WK
else (Gf1#,/3~
m_Number.Format("%d pictures captured.",nCount); cF_ Y}C
UpdateData(FALSE); (5]<t&M
} \|BtgT *$b
B_i@D?bTD
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |lm
{ poGF
if(pMsg -> message == WM_KEYDOWN) lsU|xOB
{ i=OPl
if(pMsg -> wParam == VK_ESCAPE) |!euty ::
return TRUE; 6AKH0t|4
if(pMsg -> wParam == VK_RETURN) u3(zixb
return TRUE; Q@6OIE
} P6&@fwJ<
return CDialog::PreTranslateMessage(pMsg); zGHP{a1O7
} j!B+Q
Bf~
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U=\ZeYK.
{ |GM?4'2M.
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G&)A7WaC
SaveBmp(); H{
p
return FALSE; ;|
##~Y.9
} T~J6(,"
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ R(@B4M2
CMenu pop; ,-myR1}
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^s\(2lB\F
CMenu*pMenu=pop.GetSubMenu(0); a FjcyD
pMenu->SetDefaultItem(ID_EXITICON); Ki(qA(r
CPoint pt; @(Wx(3JR?}
GetCursorPos(&pt); @G+Hrd6
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <f%JZ4p*
if(id==ID_EXITICON) xPWzm
hF
DeleteIcon(); !*HH5qh6
else if(id==ID_EXIT) w&jyijk(
OnCancel(); !(~eeE}|lM
return FALSE; W(Z_ac^e[
} j$'L-kK+
LRESULT res= CDialog::WindowProc(message, wParam, lParam); zPEx;lO$
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !4\`g?
AddIcon(); 4G"T{A`O
return res; oXRmnt
} X|^E+
`M4
,+-l1GpL
void CCaptureDlg::AddIcon() lyNa(3
{ ?
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NOTIFYICONDATA data; _)
k=F=
data.cbSize=sizeof(NOTIFYICONDATA); 3 GmU$w
CString tip; [g`9C!P-G
tip.LoadString(IDS_ICONTIP); e`
Z;}&
,
data.hIcon=GetIcon(0); `CA-s
data.hWnd=GetSafeHwnd(); ^\Tde*48
strcpy(data.szTip,tip); P+ONQN|
data.uCallbackMessage=IDM_SHELL; j|gQe .,1
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; _U( b
data.uID=98; 3TVp
oB`
Shell_NotifyIcon(NIM_ADD,&data); B38_1X7
ShowWindow(SW_HIDE); EtvZk9d6h*
bTray=TRUE; p \A ^kX^5
} o%XAw
kW0|\
void CCaptureDlg::DeleteIcon() [* ,k
{ ,*$L_itL
NOTIFYICONDATA data; `WQz_}TqB
data.cbSize=sizeof(NOTIFYICONDATA); /yPFts_q
data.hWnd=GetSafeHwnd(); ,~u 5SR
data.uID=98; N7Vv"o
Shell_NotifyIcon(NIM_DELETE,&data); l5_RG,O0A
ShowWindow(SW_SHOW); !
7A _UA8
SetForegroundWindow(); )#n0~7
&
ShowWindow(SW_SHOWNORMAL); E/2 kX 3}
bTray=FALSE; O32p8AxEz
} 'Vq
<;.A
Dg3Sn|!f
void CCaptureDlg::OnChange() RAYDl=}
{ OD7tM0Wn
RegisterHotkey(); iU"jV*P]
} d2`m0U
Aq674
BOOL CCaptureDlg::RegisterHotkey() K>iM6Uv
{ H&\[iZ|-N
UpdateData(); d.Wq@(ZoA
UCHAR mask=0; aNLRUdc.
UCHAR key=0; c<- F_+[
if(m_bControl) soh)IfZ
mask|=4; >]K:lJ]l
if(m_bAlt) eH,r%r,
mask|=2; {JTO
Q 8&
if(m_bShift) TbX#K:l
mask|=1; e/hA>
key=Key_Table[m_Key.GetCurSel()]; f'&30lF
if(bRegistered){ Br^4N9
DeleteHotkey(GetSafeHwnd(),cKey,cMask); tS#=I.ET
bRegistered=FALSE; &XAG|
#
} QY2/mtI
cMask=mask; "#,]`ME;
cKey=key; 0,$eiY)u$
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ~2u~}v5m7
return bRegistered; 1AMxZ (e
} 9RA~#S|(T
~,[-pZ<
四、小结 :U;n?Zu
S
Xi"+{6
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。