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:
-h<Rby
wx|eO[14 一、实现方法
b:uMON,H
_A %8oYS 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:
N\OeWjA F jP9)utEm6 #pragma data_seg("shareddata")
OJ:iQ HHOOK hHook =NULL; //钩子句柄
I?mU _^no UINT nHookCount =0; //挂接的程序数目
`:XrpD static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
sA u ;i static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Vg)]F+E static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
ovn)lIs static int KeyCount =0;
^gpswhp
5 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*MFsq}\ $ #pragma data_seg()
hDJ84$eVZ E%vG# 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|J_! R8lBhLs 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:
45;{tS.z,B vNJ!d BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ta-kqt!' cKey,UCHAR cMask)
OJL?[<I {
/M;A)z BOOL bAdded=FALSE;
Gdd lB2L)x for(int index=0;index<MAX_KEY;index++){
{-(B if(hCallWnd[index]==0){
tNI~<#+lg hCallWnd[index]=hWnd;
p Rn vd| HotKey[index]=cKey;
Jn_; cN HotKeyMask[index]=cMask;
*hp3w bAdded=TRUE;
\*0ow`|K KeyCount++;
PKhH0O\_U break;
HV^*_ }
+8 avA:o }
$DOBC@xxzT return bAdded;
b{KpfbxcI }
9oL/oL-J/ //删除热键
(@H'7 , BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
i(XcNnn6 {
*LbRLwt BOOL bRemoved=FALSE;
5X5 &(S\ for(int index=0;index<MAX_KEY;index++){
8uR4ZE* if(hCallWnd[index]==hWnd){
`eat7O if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
bt/u^E hCallWnd[index]=NULL;
}-:s9Lt HotKey[index]=0;
`)[bu HotKeyMask[index]=0;
tU02t#8 bRemoved=TRUE;
!dVth)UV KeyCount--;
IG1+_-H: break;
!`yg bI. }
'{:WxGgi }
:6 ?&L }
4%TY`
II return bRemoved;
]C =+ }
&xlz80% i6p0(OS&D -o\r]24 DLL中的钩子函数如下:
]:m}nJ_ :66xrw LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
_
FcfNF {
5sD\4 g)HK BOOL bProcessed=FALSE;
_N 5$>2 if(HC_ACTION==nCode)
|RBgJkS;8 {
.6yC' 3~;o if((lParam&0xc0000000)==0xc0000000){// 有键松开
jj,Y: switch(wParam)
FfnW {
5fK#*(x case VK_MENU:
Y!C=0&p MaskBits&=~ALTBIT;
Cebl"3Q break;
-t, .A/? case VK_CONTROL:
x;,H>!r"i MaskBits&=~CTRLBIT;
}\E2Z[ break;
^d! (8vh case VK_SHIFT:
YPraf$ MaskBits&=~SHIFTBIT;
`k} break;
85P7I=`*d default: //judge the key and send message
T/#$44ub break;
HF9d~7R }
FTx&] QN? for(int index=0;index<MAX_KEY;index++){
Y3+GBqP if(hCallWnd[index]==NULL)
jrGVC2*rD continue;
'OKDB7Ni if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5gV%jQgkC {
beyC't SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Farcd!} bProcessed=TRUE;
/`YHPeXu }
8v7;{4^ }
2YD;Gb[8 }
io_4d2uBh else if((lParam&0xc000ffff)==1){ //有键按下
_q >>]{5 switch(wParam)
J+3PUfg>@R {
20G..>zW case VK_MENU:
Z[Gs/D MaskBits|=ALTBIT;
E"D+CD0 break;
IT a8*Myj case VK_CONTROL:
P>/n!1c MaskBits|=CTRLBIT;
|kL^k{=zV break;
>y%*HC!G case VK_SHIFT:
Hn%n>Bnl MaskBits|=SHIFTBIT;
}v[*V break;
z\Vu`Yz default: //judge the key and send message
Fa`/i v break;
;Ub;AqY }
/79_3;^ for(int index=0;index<MAX_KEY;index++){
9*gD;) ! if(hCallWnd[index]==NULL)
6$qn'K$ continue;
#F\}PCBe' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5`oVyxJ< {
}R#YO$J7 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
yjUSM}$ bProcessed=TRUE;
-7:J#T/\ }
Yb8o`j+t }
[bd fp
a }
#<20vdc if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
yk1syN_ for(int index=0;index<MAX_KEY;index++){
IKhpe5} if(hCallWnd[index]==NULL)
@G0k+ continue;
RI_:~^nO{r if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|EuWzhNAO SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
R8a4F^{* //lParam的意义可看MSDN中WM_KEYDOWN部分
]2kgG*^n" }
=vxiqRm }
;EZ$8| }
}Wf \\ return CallNextHookEx( hHook, nCode, wParam, lParam );
1{B^RR. }
qF m=(J% 9s\;,!b 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
ek~bXy{O` XJl2_# BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
KlbL<9P> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
h$)},% e uc@f# (- 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:
CN6@g^)P -`FPR4; LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
G<9UL*HU {
8YJ8_$Z if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
ZSj^\JU {
@N?A0S/ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
z}v6!u|iZu SaveBmp();
Mq!03q6 return FALSE;
,>X
+tEgR }
y>T:fu …… //其它处理及默认处理
` z<k7ig }
qiQS:0|_ kIS_6! $
BV4 i$ 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。
:hYV\8$ vy?Zz<c; 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。
6;g_}Zx
zj.;O#hW 二、编程步骤
>]?!c5= AyZL( 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";
P#5&D*`}h swv1>52{ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
GaMiu!|, |IL..C 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;
MY11 5% t(FIBf3 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;
0q`n] NM .du FMJl 5、 添加代码,编译运行程序。
4J3cQ;z X_Vj&{ 三、程序代码
Op^r }7 $OK}jSH*v) ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
jRP.Je@t #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
;`IZ&m$ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
c`
^I% i #if _MSC_VER > 1000
I_s4Pf[l #pragma once
x}I'W?g #endif // _MSC_VER > 1000
.c~`{j} #ifndef __AFXWIN_H__
Z'EXq.hk #error include 'stdafx.h' before including this file for PCH
{VqcZhqy/l #endif
_JZS;8WYR #include "resource.h" // main symbols
L1;IXCc= class CHookApp : public CWinApp
9$F '*{8 {
c}K>#{YeB public:
R(Y4n w+Y- CHookApp();
Jybx'vZj // Overrides
]i\C4* // ClassWizard generated virtual function overrides
Gz)]1Z{%$ //{{AFX_VIRTUAL(CHookApp)
9l9h*Pgt public:
bd],fNgJ virtual BOOL InitInstance();
^i}*$ZC72 virtual int ExitInstance();
|` gSkv //}}AFX_VIRTUAL
ajFSbi)l //{{AFX_MSG(CHookApp)
'(M8D5?N- // NOTE - the ClassWizard will add and remove member functions here.
/ 0Z_$Q&e // DO NOT EDIT what you see in these blocks of generated code !
~Y^
UP //}}AFX_MSG
z.itVQs$I DECLARE_MESSAGE_MAP()
X2PQL"` };
86(8p_&zC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
-z%|
Jk BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wmu#@Hf/[h BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
o'S&YD BOOL InitHotkey();
03aa>IO BOOL UnInit();
9
z_9yT #endif
O+U9 p C]{:>= K //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
r9@4-U7v& #include "stdafx.h"
xB=~3 #include "hook.h"
oW]~\vp^0 #include <windowsx.h>
^3*k6h[( #ifdef _DEBUG
,1+AfI #define new DEBUG_NEW
:Z0m " #undef THIS_FILE
S`ms[^-q* static char THIS_FILE[] = __FILE__;
&y-(UOqbkP #endif
L$*sv. #define MAX_KEY 100
S0+nQM% #define CTRLBIT 0x04
$7%e|0jC #define ALTBIT 0x02
}$-;P=k #define SHIFTBIT 0x01
T@c{5a #pragma data_seg("shareddata")
@?,iy?BSG HHOOK hHook =NULL;
`8$gaA* UINT nHookCount =0;
Z~O1$,Z static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Aa^%_5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
i^LLKx7M& static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
kI5`[\ static int KeyCount =0;
Y{~[N y E static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
fv?vO2nj #pragma data_seg()
^Y"c1f2 HINSTANCE hins;
`em}vdY void VerifyWindow();
a!ao{8# BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
QAiont ,! //{{AFX_MSG_MAP(CHookApp)
-A}U^-'a} // NOTE - the ClassWizard will add and remove mapping macros here.
5AV5`<r. // DO NOT EDIT what you see in these blocks of generated code!
P~Cx#`#(V //}}AFX_MSG_MAP
~4YU END_MESSAGE_MAP()
f,utA3[ *^]Hqf(` CHookApp::CHookApp()
<4!SQgL {
Z["[^=EP // TODO: add construction code here,
JY4sB8 // Place all significant initialization in InitInstance
H4#|f n }
f>d aK9$( ]=T`8)_r) CHookApp theApp;
k.b->U LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
DpG|Kl|d {
7;H!F!K] BOOL bProcessed=FALSE;
+z/_'DE if(HC_ACTION==nCode)
EMyMed_ {
$`L!2 if((lParam&0xc0000000)==0xc0000000){// Key up
^(5Up=.EA switch(wParam)
"P O>@tY {
`/en&l case VK_MENU:
-X#Zn># MaskBits&=~ALTBIT;
=bt/2nPV break;
{ir8n731p
case VK_CONTROL:
Ys8p,.OMs MaskBits&=~CTRLBIT;
z:C
VzK, break;
u_+64c_7 case VK_SHIFT:
Lyjt$i W% MaskBits&=~SHIFTBIT;
/(#;(] break;
gWcl@|I;\ default: //judge the key and send message
yEm[C(gZ break;
qi!Nv$e }
[o]^\ay for(int index=0;index<MAX_KEY;index++){
*m_B#~4 if(hCallWnd[index]==NULL)
4c"x&x| continue;
h`X>b/V if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
;{xk[fm= {
N;4tvWI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
C^sHj5\( bProcessed=TRUE;
c#lW ? }
")%)e ;V3 }
OV)J }
R7xKVS_MP else if((lParam&0xc000ffff)==1){ //Key down
@I{v switch(wParam)
_=ani9E]uF {
>^vyp! case VK_MENU:
7v9l+OX,6 MaskBits|=ALTBIT;
fI:j@Wug break;
#3!l6] case VK_CONTROL:
4L'dV MaskBits|=CTRLBIT;
[se J'Io break;
o&tETJ5Bhe case VK_SHIFT:
0OJBC~?{\ MaskBits|=SHIFTBIT;
cB~D3a0Th break;
lCmTm default: //judge the key and send message
Y](kMNUSg break;
".Lwq_ }
H^UuT for(int index=0;index<MAX_KEY;index++)
bB01aiUw@l {
eJWcrVpn if(hCallWnd[index]==NULL)
\4;}S&` k continue;
G$b*N4yR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
TiiMX {
?f{{{0$S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
u,]?_bK) bProcessed=TRUE;
&DnX6%2 }
RLuA^ONI }
JO*}\Es }
gmG
M[c \ if(!bProcessed){
=pQ'wx|>| for(int index=0;index<MAX_KEY;index++){
BEn,py7 if(hCallWnd[index]==NULL)
Q
a(>$. h continue;
tqdw
y. if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
]w2nVC3 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
4`(b(DL] }
fQZ,kl }
FjUf| }
(8bo"{zI return CallNextHookEx( hHook, nCode, wParam, lParam );
ivy+e-) }
,{{e'S9cy ["N{6d&Q BOOL InitHotkey()
qo2/? ]
{
/%W&zd=%# if(hHook!=NULL){
>lZ9Y{Y4v nHookCount++;
xWNB/{F return TRUE;
\>}G|yL }
}bwH(OOS else
Bismd21F6= hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
e;QPn( if(hHook!=NULL)
{<\ [gm\X nHookCount++;
-)S(eqq1 return (hHook!=NULL);
g=8}G$su{% }
)?@X{AN& BOOL UnInit()
@.JhL[f {
@EPO\\C"f if(nHookCount>1){
P)VysYb? nHookCount--;
%!_okf return TRUE;
IhIPy~Hgt }
mGf@J6wGz BOOL unhooked = UnhookWindowsHookEx(hHook);
:nk $?5ib if(unhooked==TRUE){
u19d!#g nHookCount=0;
Mp8BilH-T hHook=NULL;
!'E{D`A9 }
0taopDi;d return unhooked;
aTJs.y-I~ }
?V3kIb ;xp^FKP BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+mc0:e{WF {
1trk BOOL bAdded=FALSE;
4g^nhJP$ for(int index=0;index<MAX_KEY;index++){
$@H]0<3, if(hCallWnd[index]==0){
Qw&It hCallWnd[index]=hWnd;
?Q`u\G3.m HotKey[index]=cKey;
IF"-{@ HotKeyMask[index]=cMask;
(]*otVJ bAdded=TRUE;
?`jh5Kw%y KeyCount++;
Xbm\"g \ break;
n*7Ytz3#' }
_FG?zE }
^Q)&lxlxpx return bAdded;
ryk(Am< }
s\7]"3:wD 6xLLIby, BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'"#W!p {
zUw=e}?: BOOL bRemoved=FALSE;
e
MX?x7 for(int index=0;index<MAX_KEY;index++){
z%$,F9/ if(hCallWnd[index]==hWnd){
&f2'cR if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Z?IwR hCallWnd[index]=NULL;
HY
(|31 HotKey[index]=0;
=LP,+z HotKeyMask[index]=0;
c:%ll&Xtn bRemoved=TRUE;
}p2YRTH x KeyCount--;
6Dx^$=Sa$ break;
=3~u.iq$ }
:cx}I }
@Yv+L) }
*3,Kn}ik return bRemoved;
fT:a{ }
#M9rt~4 wOhiC$E46 void VerifyWindow()
s<}d)L( {
;ALkeUR[ for(int i=0;i<MAX_KEY;i++){
9DAk|K if(hCallWnd
!=NULL){ ]z^*1^u^ig
if(!IsWindow(hCallWnd)){ ukZ>_ke`+
hCallWnd=NULL; G-vBJlt=t
HotKey=0; vMDX
HotKeyMask=0; TB!z:n
KeyCount--; YIb=rR[ $
} 3k5C;5
} L=Pz0
} !|SVRaS
} nhbCk6Y5LZ
WyO7,Qr\
BOOL CHookApp::InitInstance() 0N" VOEvG
{ DH3.4EUWS
AFX_MANAGE_STATE(AfxGetStaticModuleState()); :P!"'&gCL
hins=AfxGetInstanceHandle(); 7U:-zfq
InitHotkey(); O@[jNs)].
return CWinApp::InitInstance(); F@+FXnz
} {
S]"-x
XOk0_[
int CHookApp::ExitInstance() YlF<S49loC
{ YPq4VX,
VerifyWindow(); O.ce"5Y^
UnInit(); C`p)S`d
return CWinApp::ExitInstance(); BtPUUy.
} 7q%<JZPY
!uoQLiH+
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >EMsBX
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) .V4w+:i
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ XN*?<s3
#if _MSC_VER > 1000 f&z@J,_=
#pragma once 6}Iu~|5
#endif // _MSC_VER > 1000 .Mn+Bd4f
eM3-S=R?<g
class CCaptureDlg : public CDialog fj/sN HU
{ Myal3UF
// Construction +{qX,
public: Q9Y$x{R&
BOOL bTray; ^oL43#Nlo
BOOL bRegistered; R{GT?
wl
BOOL RegisterHotkey(); f3g#(1
UCHAR cKey; uQ} 0hs
UCHAR cMask; `oDs]90
void DeleteIcon(); %[l*:05
void AddIcon(); ~v
/N G
UINT nCount; R<5GG|(B
void SaveBmp(); zOkIPv52~
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ] bPj%sb*@
// Dialog Data 1XwW4cZ>:
//{{AFX_DATA(CCaptureDlg) ]VYv>o`2
enum { IDD = IDD_CAPTURE_DIALOG }; R')D~JJ<8a
CComboBox m_Key; O%w"bEr)N
BOOL m_bControl; UG]]Vk1d]
BOOL m_bAlt; <c,/+
lQ^
BOOL m_bShift; .e^AS~4pl
CString m_Path; ( %i)A$i6a
CString m_Number; u:6PAVW?
//}}AFX_DATA yMJY6$Ct
// ClassWizard generated virtual function overrides k|ol+
9Z
//{{AFX_VIRTUAL(CCaptureDlg) R(i2TAaaU
public: )ZyEn%
virtual BOOL PreTranslateMessage(MSG* pMsg); I3{koI
protected: 1l8kuwH
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u-31$z<<5}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e:h(,
//}}AFX_VIRTUAL POnI&y]
// Implementation jJX-S
protected: (c'=jJX
HICON m_hIcon; `|["{j}^
// Generated message map functions _fVC\18T
//{{AFX_MSG(CCaptureDlg) e)(m0m\
virtual BOOL OnInitDialog();
IjK
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); j-?zB.jAh
afx_msg void OnPaint(); %XpYiW#AK
afx_msg HCURSOR OnQueryDragIcon(); ?gq',FFDq
virtual void OnCancel(); qWQ7:*DL
afx_msg void OnAbout(); BIFuQ?j3
afx_msg void OnBrowse(); -w0U}Te^
afx_msg void OnChange(); ))pp{X2m
//}}AFX_MSG Rk1B \L|M
DECLARE_MESSAGE_MAP() ^m3[mY [a
}; #Cwzk{p(
#endif oAMB}a;
\Mujx3Fmvx
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <@Lw '
#include "stdafx.h" (>E}{{>2r
#include "Capture.h" L>,j*a_[
#include "CaptureDlg.h" 4\#!Gv-
#include <windowsx.h> oX2J2O
#pragma comment(lib,"hook.lib") &$'=SL(Z
#ifdef _DEBUG f;Iaf#V_
#define new DEBUG_NEW C*S%aR
#undef THIS_FILE 6{XdLI
static char THIS_FILE[] = __FILE__; l~Em2@c
#endif ]<V,5'xh
#define IDM_SHELL WM_USER+1 ,%|$#
g 0
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ) <lpI';T
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E^RPK{zO
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :HJ@/s!J
class CAboutDlg : public CDialog xnyp'O8yk
{ WFOO6
kMz
public: zF&>1y.$
CAboutDlg(); # j=r
// Dialog Data K3c(c%$<R
//{{AFX_DATA(CAboutDlg) k 5<[N2D|!
enum { IDD = IDD_ABOUTBOX }; #4WA2EW
//}}AFX_DATA :%#(<@ {
// ClassWizard generated virtual function overrides \~1>%F'op
//{{AFX_VIRTUAL(CAboutDlg) CoZXbTq
protected: w|"cf{$^x
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8?n6\cF
//}}AFX_VIRTUAL |;L%hIR[
// Implementation N+<`Er
protected: 5y}kI
//{{AFX_MSG(CAboutDlg) wU\3"!^h
//}}AFX_MSG 12NV
DECLARE_MESSAGE_MAP() 6.%V"l
}; 3$R^tY2UU
" <GDOL
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +O@v|}9"w3
{ x8]9Xe:_>O
//{{AFX_DATA_INIT(CAboutDlg) rC(-dJkV
//}}AFX_DATA_INIT STC'j1U
} F-^#EkEGe
b&Dc DX
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {kLL&`ii
{ ?c vXuxCm
CDialog::DoDataExchange(pDX); &DqeO8?Q
//{{AFX_DATA_MAP(CAboutDlg) w% Ug9
//}}AFX_DATA_MAP g@&@]63
} ;'o:1{Y
\XG18V&
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %H-(-v^T*
//{{AFX_MSG_MAP(CAboutDlg) #-QQ_
// No message handlers bS0z\!1
//}}AFX_MSG_MAP (I?CW~3#
END_MESSAGE_MAP() B:YUb{CJ
zLG5m]G4D
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :Kc}R)6
: CDialog(CCaptureDlg::IDD, pParent) q><E?
{ ]FJpe^
ua
//{{AFX_DATA_INIT(CCaptureDlg) ^,Sl^ 9K
m_bControl = FALSE; Q(
WE.ux)<
m_bAlt = FALSE; K%Sy~6iD&
m_bShift = FALSE; t=`bXBX1
m_Path = _T("c:\\"); ,{@,dw`lUz
m_Number = _T("0 picture captured."); !wws9
nCount=0; N6GvzmG#g
bRegistered=FALSE; `_IgH
bTray=FALSE; ] M"l-A
//}}AFX_DATA_INIT TP6iSF
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 29+p|n
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (_}w4N#
} UuV<#N)
0n<t/74
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) P|"U
{ mUj=NRq
CDialog::DoDataExchange(pDX); EM_`` 0^
//{{AFX_DATA_MAP(CCaptureDlg) zh hHA9
DDX_Control(pDX, IDC_KEY, m_Key); YpFh_Zr[
DDX_Check(pDX, IDC_CONTROL, m_bControl); 4XkSj9D~z
DDX_Check(pDX, IDC_ALT, m_bAlt); 5WR(jl+M
DDX_Check(pDX, IDC_SHIFT, m_bShift); =H'7g6
DDX_Text(pDX, IDC_PATH, m_Path); -{
Ng6ntS
DDX_Text(pDX, IDC_NUMBER, m_Number); VQ{.Ls2`Z
//}}AFX_DATA_MAP =6mnXpM.
} >L#HE
&Rgy/1
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /4\!zPPj.
//{{AFX_MSG_MAP(CCaptureDlg) 7Y:~'&U|
ON_WM_SYSCOMMAND() oGzZ.K3 A
ON_WM_PAINT() H3=U|wr|
ON_WM_QUERYDRAGICON() S`LS/)
ON_BN_CLICKED(ID_ABOUT, OnAbout) @v1f)(N
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }gE?ms4$
ON_BN_CLICKED(ID_CHANGE, OnChange) Ok-*xd
//}}AFX_MSG_MAP Az_s"}G
END_MESSAGE_MAP() 3pSkk
Td&w
BOOL CCaptureDlg::OnInitDialog() LB<,(dyh
{ B!vI^W
CDialog::OnInitDialog(); L< MIl[z7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); EwSE;R -
ASSERT(IDM_ABOUTBOX < 0xF000); c\.8hd=<
CMenu* pSysMenu = GetSystemMenu(FALSE); IxY%d}[uo
if (pSysMenu != NULL) Z/ "jLfP
{ qb+vptg@I
CString strAboutMenu; Fe(qf>E
strAboutMenu.LoadString(IDS_ABOUTBOX); 5feCA ,v7
if (!strAboutMenu.IsEmpty()) R3]Ra&h6N)
{ 0K-jF5i$`
pSysMenu->AppendMenu(MF_SEPARATOR); 3P1OyB
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); tHhA_
} ,q
yp2Y7
} !]tZE%?
SetIcon(m_hIcon, TRUE); // Set big icon LbGyD;#_
SetIcon(m_hIcon, FALSE); // Set small icon c&Pgz~iP
m_Key.SetCurSel(0); MB,;HeP!
RegisterHotkey(); _v2K1 1
CMenu* pMenu=GetSystemMenu(FALSE); ,!"\L~6
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YuWsE4$
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); C7ZU)MEUd/
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z5/g\G[
return TRUE; // return TRUE unless you set the focus to a control 6x*u S~'
} pn6 e{
Hu
.e@7
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /J8'mCuC.
{ '-F
}(9M
if ((nID & 0xFFF0) == IDM_ABOUTBOX) eMf+b;~R
{ ;!(.hCHvr
CAboutDlg dlgAbout; ;J3az`
dlgAbout.DoModal(); IrU}%ZVV
} y0Pr[XZ
else m:77pE&o
{ b??k|q
CDialog::OnSysCommand(nID, lParam); ;C8'7
} *)c,~R^
} g->cgExj
P=K+!3ZXo
void CCaptureDlg::OnPaint() A*ImruV
{ .!kqIx*3
if (IsIconic()) {0fQ"))"
{ n/_cJD\
CPaintDC dc(this); // device context for painting u 89u#gCAC
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Xp]tL3-p
// Center icon in client rectangle *N"bn'>3
int cxIcon = GetSystemMetrics(SM_CXICON); 3IqYp K(s
int cyIcon = GetSystemMetrics(SM_CYICON); n237%LH[
CRect rect; CErkmod{}e
GetClientRect(&rect); f!}c0nb
int x = (rect.Width() - cxIcon + 1) / 2; :%Dw3IrOM
int y = (rect.Height() - cyIcon + 1) / 2; h(hb?f@1:
// Draw the icon `;L0ax
dc.DrawIcon(x, y, m_hIcon); W?m?r.K?
} DXAA[hUjF
else :U`8s#
{ !m"(SJn"
CDialog::OnPaint(); Za{sT&(|
} ,4ftQJ
} %=J<WA6\
4a;8XAl
HCURSOR CCaptureDlg::OnQueryDragIcon() rJJI<{$
{ dB7E&"f
return (HCURSOR) m_hIcon; D/_=rAl1
} ;8UHnhk_O
?U]/4]
void CCaptureDlg::OnCancel() yi3@-
{ @>'.F<:P<
if(bTray) kW&{0xkGR
DeleteIcon(); <o5+*X
CDialog::OnCancel(); q2}<n'o+
} Lxm1.TOJ
K#g)t/SZ
void CCaptureDlg::OnAbout() mqGp]'{
{ x\j6=|
CAboutDlg dlg; |2!/<%Yr`
dlg.DoModal(); yKEE @@}\
} B[^mWVp6L
O&93QN0
void CCaptureDlg::OnBrowse() T`46\KkN
{ Zg%SE'kK
CString str; vs|>U-Mpw~
BROWSEINFO bi; @RKw1$BA
char name[MAX_PATH]; m?hC!n>
ZeroMemory(&bi,sizeof(BROWSEINFO)); 2s,wC!',
bi.hwndOwner=GetSafeHwnd(); >S5:zz\
bi.pszDisplayName=name; ,L&Ka|N0
bi.lpszTitle="Select folder"; uQ#3;sFO
bi.ulFlags=BIF_RETURNONLYFSDIRS; !8]W"@qb
LPITEMIDLIST idl=SHBrowseForFolder(&bi); GYot5iLg
if(idl==NULL) JpDc3^B*
return; 6vz9r)L
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); D,+I)-k<
str.ReleaseBuffer(); F7^d@hSV
m_Path=str; :Vq gmn
if(str.GetAt(str.GetLength()-1)!='\\') M:h~;+s
m_Path+="\\"; s% `o
UpdateData(FALSE); 8}m]XO
} GE=#8-@g~p
^I9x@t
void CCaptureDlg::SaveBmp() P-ma~g>I
{ :NHh`@0F
CDC dc; '3eP<earRP
dc.CreateDC("DISPLAY",NULL,NULL,NULL); MId\dFu
CBitmap bm; dI&2dcumS
int Width=GetSystemMetrics(SM_CXSCREEN); r7sPFM
int Height=GetSystemMetrics(SM_CYSCREEN); Nzz" w_#
bm.CreateCompatibleBitmap(&dc,Width,Height); ]J)WcM:
CDC tdc;
L's_lC
tdc.CreateCompatibleDC(&dc); C^RO@kM
CBitmap*pOld=tdc.SelectObject(&bm); $(_Xt- 6
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BuI&kU,WY
tdc.SelectObject(pOld); rWF~aec
BITMAP btm; >L?)f3_a
bm.GetBitmap(&btm); *""'v
DWORD size=btm.bmWidthBytes*btm.bmHeight; uY5 &93R
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FLY#
BITMAPINFOHEADER bih; [Fe`}F}Co8
bih.biBitCount=btm.bmBitsPixel; waXA%u50
bih.biClrImportant=0; #X7fs5$&
bih.biClrUsed=0; &ZFsK c#
bih.biCompression=0; n@w$5y1@
bih.biHeight=btm.bmHeight; =kohQ d.n
bih.biPlanes=1; xtN%v0ZZ
bih.biSize=sizeof(BITMAPINFOHEADER); v]gJ 7x
bih.biSizeImage=size; P5Ms
X~mT
bih.biWidth=btm.bmWidth; a;m-Vu!
bih.biXPelsPerMeter=0; &| el8;D
bih.biYPelsPerMeter=0; H Kx2QFB
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R<)7,i`F
static int filecount=0; yWu80C8q
CString name; ,6,#Lc
name.Format("pict%04d.bmp",filecount++); 6Km@A M]
name=m_Path+name; G_=`&i"4
BITMAPFILEHEADER bfh; SZH,I&8
bfh.bfReserved1=bfh.bfReserved2=0; )El#Ks5u
bfh.bfType=((WORD)('M'<< 8)|'B'); #sy)-xM
bfh.bfSize=54+size; E>xdJ
bfh.bfOffBits=54; @rkNx@[~
CFile bf; LJYFz=p"
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ K~AQ) ]pJI
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); CD%wi:C%|
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (4n 8[
bf.WriteHuge(lpData,size); /og2+!
bf.Close(); Ix !O&_6s
nCount++; i;`rzsRb
} e m<(wJ-Y
GlobalFreePtr(lpData); ^.Vq0Qzy]
if(nCount==1) z+&mMP`-
m_Number.Format("%d picture captured.",nCount); ?n>h/[/
else AM*V4}s*9k
m_Number.Format("%d pictures captured.",nCount); #/!a=0
UpdateData(FALSE); q(i|
} ;OTD1=
ZffK];D
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4&~1|B{Z
{ Zz=+?L
if(pMsg -> message == WM_KEYDOWN)
v! uD]}
{ 3,e^;{w
if(pMsg -> wParam == VK_ESCAPE) Hn0,LH$/
return TRUE; y^=\w?d
if(pMsg -> wParam == VK_RETURN) &V$_u#<
return TRUE; (}vi"mCeW
} )U e9:e
return CDialog::PreTranslateMessage(pMsg); >y"V%
} aGx`ec*t
3J~Q pw0<
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Jj_E/c"
{ i,M<}e1
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *Ibl+
SaveBmp(); Xa#`VDh
return FALSE; g:`V:kbY$
} )FGm5-K@
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3|-)]^1O
CMenu pop; gI6./;;x
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); p ElF,Y
CMenu*pMenu=pop.GetSubMenu(0); E(*RtOC<W
pMenu->SetDefaultItem(ID_EXITICON); l_FttN
CPoint pt; }Zc.rk
GetCursorPos(&pt); |"?0H#
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); A#RA;Dt:
if(id==ID_EXITICON) 'J#u;KJ
DeleteIcon();
IM|VGT0
else if(id==ID_EXIT) i-~HT4iw
OnCancel(); z{Z'2 ,#
return FALSE; 4*d$o=wa
} {<o_6 z`$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); yNi/JM
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p)RASIB
AddIcon(); \-$wY%7
return res; s6%% /|
} ?<bByxa
CEq0ZL-W
void CCaptureDlg::AddIcon() CWdA8)n.
{ %WiDz0o
NOTIFYICONDATA data; 5Jh=${
data.cbSize=sizeof(NOTIFYICONDATA); 9'faH
CString tip; @v\Osp t=
tip.LoadString(IDS_ICONTIP); `WGT`A"
data.hIcon=GetIcon(0); x
hBlv
data.hWnd=GetSafeHwnd(); ,<0R'R
strcpy(data.szTip,tip); <43O,Kx'Su
data.uCallbackMessage=IDM_SHELL; d}j%.JJK
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3#`_t :"A
data.uID=98; C|bnUN
Shell_NotifyIcon(NIM_ADD,&data); x>d,\{U
ShowWindow(SW_HIDE); zBtlkBPu
bTray=TRUE; #S)+eH
} HWOs
DKnjmZ:J|
void CCaptureDlg::DeleteIcon() _TY9!:&}q
{ /J )MW{;O
NOTIFYICONDATA data; A-Be}A
data.cbSize=sizeof(NOTIFYICONDATA); 3&:Us|}
data.hWnd=GetSafeHwnd(); X|fl_4NC>
data.uID=98; K?o( zh;
Shell_NotifyIcon(NIM_DELETE,&data); o8;>E>;
ShowWindow(SW_SHOW); ZpvURp,I
SetForegroundWindow(); WcqQR))n
ShowWindow(SW_SHOWNORMAL); dc.9:u*w
bTray=FALSE; 0Am&:kX't
} uP2e/a
0F> ils
void CCaptureDlg::OnChange() "c` $U]M%
{ _ dEc? R}
RegisterHotkey(); FOVghq@
} }vzP\
:_V9Jwu
BOOL CCaptureDlg::RegisterHotkey() ~o_0RB
{ >uT,Z,7O
UpdateData(); /5 yjON{
UCHAR mask=0; FFX-kS
UCHAR key=0; 0=O(+
yi
if(m_bControl) wd*8w$\
mask|=4; +A%|.;
if(m_bAlt) + 2v6fan
mask|=2; 15dhr]8E
if(m_bShift) Yci>'$tQ
mask|=1; Ey96XJV
key=Key_Table[m_Key.GetCurSel()]; F|pM$Kd`
if(bRegistered){ 2*;qr|h,
DeleteHotkey(GetSafeHwnd(),cKey,cMask); $2uk;&"?A=
bRegistered=FALSE; 9'+Eu)l:
} "g27|e?y
cMask=mask; zGgPW
cKey=key; p_%dH
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )tYu3*'
return bRegistered; eA q/[(
} xe?!UCUb@
VF[$hs
四、小结 -([
ipg(r
~+DPq|-O
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。