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:
ibZt2@GB)I
TZ&4 一、实现方法
n=<NFkeX |dl0B26x 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:
[ 5CS}FB :"OZc7
~ #pragma data_seg("shareddata")
_KSfP7VU HHOOK hHook =NULL; //钩子句柄
A6?qIy UINT nHookCount =0; //挂接的程序数目
BB2_J=wA static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
*1|YLy static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
x38SSzG:L static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
tsTR2+GZS static int KeyCount =0;
>u9id>+ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Ax5mP8S #pragma data_seg()
O3^98n2 G*P[z'K= 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。
(TT3(|v :DOr!PNA 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:
o9KyAP$2 4c5^7";P BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
avu*>SB cKey,UCHAR cMask)
Ij;==f~G {
x !#Ma BOOL bAdded=FALSE;
]k[Q]:q for(int index=0;index<MAX_KEY;index++){
Cp .1/ if(hCallWnd[index]==0){
2gQY8h8 hCallWnd[index]=hWnd;
;,v!7 HotKey[index]=cKey;
s"I-YFP%c HotKeyMask[index]=cMask;
R4#;<) bAdded=TRUE;
CTh1+&Pa KeyCount++;
]^iFqQe break;
Nd]0ta }
XAjd
%Xv< }
B,~f " return bAdded;
jGO9n }
)LkM,T //删除热键
VqcBwJ!?p BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Gkdm7 SV {
:[y]p7;{f BOOL bRemoved=FALSE;
Nj0-`j0E for(int index=0;index<MAX_KEY;index++){
52>[d3I3 if(hCallWnd[index]==hWnd){
4mEzcwo' if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
>X;xIyRL hCallWnd[index]=NULL;
8q_1(& O HotKey[index]=0;
r5f^WZ$- HotKeyMask[index]=0;
+IwdMJ8&8 bRemoved=TRUE;
Xtuhc dzu[ KeyCount--;
Hnfvo*6d.e break;
I#i?** }
e%PCe9 }
mDb-=[W5 }
Jz~+J*r;]A return bRemoved;
kmZ.U># }
+\+Uz!YS th5,HO~ *e(:["v DLL中的钩子函数如下:
T&o,I NY4!TOp LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
j`>?"1e@x {
fUb1/-} BOOL bProcessed=FALSE;
DBQOxryP>o if(HC_ACTION==nCode)
5."5IjZu {
{F;,7Kn+l if((lParam&0xc0000000)==0xc0000000){// 有键松开
' oBo| switch(wParam)
gb.f%rlZ` {
Q{H17]W case VK_MENU:
TFBYY{Y MaskBits&=~ALTBIT;
T&?w"T2y break;
hmc\|IF` case VK_CONTROL:
/6Y0q9 MaskBits&=~CTRLBIT;
R
^HohB break;
77+|#<J case VK_SHIFT:
/uK)rG
F MaskBits&=~SHIFTBIT;
Bs_S.JP<` break;
=YWT|%^uX default: //judge the key and send message
A{4Dzm ! break;
aML#Z |n }
'
be P for(int index=0;index<MAX_KEY;index++){
9OPK4- if(hCallWnd[index]==NULL)
v2IEJ continue;
*y)4D[
z- if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#0}Ok98P {
)J;ny!^2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
lo"j )Zt bProcessed=TRUE;
+c-6#7hh }
2>\b: }
pNP_f:A| }
N2ni3M5v else if((lParam&0xc000ffff)==1){ //有键按下
%,33gZzf switch(wParam)
BqQ] x'AF {
||R0U@F, case VK_MENU:
R78!x*U} MaskBits|=ALTBIT;
3 t/ R 2M break;
xC<R:"Mn case VK_CONTROL:
|a%B|CX MaskBits|=CTRLBIT;
wHA/b.jH break;
tJff+n> case VK_SHIFT:
'P+f|d[ MaskBits|=SHIFTBIT;
I4rV5;f
H4 break;
ojX%RU default: //judge the key and send message
l+t #"3 break;
;?0_Q3IML }
UMT\Q6p for(int index=0;index<MAX_KEY;index++){
])eOa% if(hCallWnd[index]==NULL)
U9x4j_.q continue;
_8al if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FH4u$g+ {
<F ew<r2 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
]y.Rg{iv bProcessed=TRUE;
wjL|Z8 }
oBb?"2 ~9 }
w %;hl#s }
yDzdE; if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
S)+CTVVE for(int index=0;index<MAX_KEY;index++){
tL1P<1j_ if(hCallWnd[index]==NULL)
vuXS/ d continue;
C9o$9 l+B if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
j]>=1Rd0b( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
>o#ERNf //lParam的意义可看MSDN中WM_KEYDOWN部分
4ffU;6~l' }
~xw5\Y^ }
juH wHt }
K|US~Hgv return CallNextHookEx( hHook, nCode, wParam, lParam );
9WOu8Ia }
d`85P+Qen| D@#0 dDT 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
XjxPIdX_H #$FY+` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
n"iNKR>nW BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
"@4ghot t :VJV 5f{ 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:
b"Zq0M0l s_xV-C#q@ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
J,RDTXqn {
!I~C0u if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
#VO.%H}i {
Ey'J]KVW //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
s1{[{L3 SaveBmp();
un6cD$cHr return FALSE;
MO-!TZ+6 }
_AprkI_ …… //其它处理及默认处理
kymn)Ea }
aV<^IxE; 0potz]} V`[P4k+b 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
|gW
(|dPeix| 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
Qo.Uqz.C vGMJ ^q 二、编程步骤
DKTD Z* %MbyKz:X 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
t-!m
vx9Z {M[~E|@D 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
^Z#@3= , |l@j% 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
wYjQV?, #sZIDn J# 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
1+a@k
.1LPlZ 5、 添加代码,编译运行程序。
gJh}CrU- 2
Kla8 三、程序代码
gM#jA8gz }"n7~| ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
qi&D+~Gv! #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
U;pe: #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
1M+oTIN #if _MSC_VER > 1000
N 'i,> #pragma once
-6`;},Yr #endif // _MSC_VER > 1000
a8zZgIV #ifndef __AFXWIN_H__
nkRK+~> #error include 'stdafx.h' before including this file for PCH
lufeieW #endif
L<=) @7 #include "resource.h" // main symbols
(UGol[f< class CHookApp : public CWinApp
'B`#:tX^N {
c" +zgP public:
#]y5zi CHookApp();
Tm_8<$ 7 // Overrides
;%Q&hwj // ClassWizard generated virtual function overrides
' S ,2 //{{AFX_VIRTUAL(CHookApp)
&{ ZSE^ public:
4jGLAor| virtual BOOL InitInstance();
U(*yL- virtual int ExitInstance();
csDQva\ //}}AFX_VIRTUAL
3fp> 4;ym' //{{AFX_MSG(CHookApp)
m2 O&2[g // NOTE - the ClassWizard will add and remove member functions here.
UOt8Q0)} // DO NOT EDIT what you see in these blocks of generated code !
'_0 //}}AFX_MSG
krjN7& DECLARE_MESSAGE_MAP()
@1g&Z}L
o };
SO3cY#i
z" LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
+xp*]a BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
_B[WY BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.,M;huRg BOOL InitHotkey();
L M
/Ga BOOL UnInit();
Jq)U</ #endif
/H)Br~ l a+Ab]m8` //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
4,~tl~FD #include "stdafx.h"
,{8v4b- #include "hook.h"
OKAkl #include <windowsx.h>
[;^,CD|P #ifdef _DEBUG
u-szt ? O| #define new DEBUG_NEW
:u/mTZDi #undef THIS_FILE
41yOXy ;~l static char THIS_FILE[] = __FILE__;
0x ~`5h #endif
^A!$i$NON #define MAX_KEY 100
`WnQ #define CTRLBIT 0x04
smup,RNZRX #define ALTBIT 0x02
6D/tK| #define SHIFTBIT 0x01
utH%y\NMF| #pragma data_seg("shareddata")
,E}$[mHyjz HHOOK hHook =NULL;
[l*;E
f, UINT nHookCount =0;
mU@xcN static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
<lj\#'G3 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
R ]P;sk5 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
>1ZJ{se static int KeyCount =0;
6 P*O&1hv static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
[s}/nu~U #pragma data_seg()
8r^ ~0nm HINSTANCE hins;
WYszk ,E void VerifyWindow();
Q7GY3X*kA BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
N4wA#\- //{{AFX_MSG_MAP(CHookApp)
=~ jAoOC@ // NOTE - the ClassWizard will add and remove mapping macros here.
wz=z?AZW // DO NOT EDIT what you see in these blocks of generated code!
P1V1as //}}AFX_MSG_MAP
;#/0b{XFj END_MESSAGE_MAP()
S
GM!#K 78]gtJ CHookApp::CHookApp()
&{z<kmc$6 {
P^i.La, // TODO: add construction code here,
E\$C/}T // Place all significant initialization in InitInstance
S_\
F }
Cj^{9'0 nIBFk?)6 CHookApp theApp;
>qh?L#Fk LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
F8=nhn {
c!wtf,F BOOL bProcessed=FALSE;
6ep>hS4A& if(HC_ACTION==nCode)
Fm3t'^SqF {
!9 f4R/ ? if((lParam&0xc0000000)==0xc0000000){// Key up
c-8!#~M( switch(wParam)
z<&m*0WYA {
wC`
R>) case VK_MENU:
1mH\k5xu MaskBits&=~ALTBIT;
SlaDt break;
CDdkoajBa case VK_CONTROL:
-^SA8y MaskBits&=~CTRLBIT;
WG5W0T_ break;
B42sb_ case VK_SHIFT:
zwr\:Hu4 MaskBits&=~SHIFTBIT;
W^3;F1 break;
1@_T m default: //judge the key and send message
#/
"+ break;
; Lql_1 }
*e/K:k for(int index=0;index<MAX_KEY;index++){
1%`7.;!i if(hCallWnd[index]==NULL)
BX< dSK continue;
AGq>=avv if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
9wh2f7k {
YRcps0Dx9 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
L*]0"E bProcessed=TRUE;
Xy7Z38G }
jd:B \%#![ }
1RqgMMJL }
ax|1b`XUr" else if((lParam&0xc000ffff)==1){ //Key down
k;Fh4Hv switch(wParam)
\40YGFO {
&.N$ case VK_MENU:
bx}fj#J]En MaskBits|=ALTBIT;
p#@Z$gTH`' break;
O#_b7i case VK_CONTROL:
<Kt3PyF MaskBits|=CTRLBIT;
>M;u*Go`QO break;
\x+3f case VK_SHIFT:
tju|UhP3 MaskBits|=SHIFTBIT;
&`!^Zq vG break;
aGoE,5 default: //judge the key and send message
[j9E pi( break;
0KvVw rWJ }
,1UZv>}S for(int index=0;index<MAX_KEY;index++)
Qa`hR {
11UB4CA if(hCallWnd[index]==NULL)
tIuoD+AW continue;
nII^mg~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
sl|_=oXT {
B0Xl+JIR# SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
glUo7^ay7 bProcessed=TRUE;
nH[+n `{o }
ux-CpI }
cAuY4RV }
K@:m/Z}|4 if(!bProcessed){
q/gB<p9 for(int index=0;index<MAX_KEY;index++){
G/?~\
}:s
if(hCallWnd[index]==NULL)
<{J5W6 continue;
J5yidymrpW if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
E4[}lX} SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
l]_=:)" ] }
P?ep] }
[QczlwmO }
*"{&FEV return CallNextHookEx( hHook, nCode, wParam, lParam );
0 P|&Pq&IH }
acW'$@y9?N Q^_/By@ BOOL InitHotkey()
C"w
{\
&R {
7Z,/g|s}z if(hHook!=NULL){
1np^(['ih nHookCount++;
U4,2 br> return TRUE;
m7qqY
}
}5 9U}@xC else
lmCZ8 j(FF hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Bl;KOR if(hHook!=NULL)
C+V*
Fh3 nHookCount++;
t+TYb#Tc return (hHook!=NULL);
`\Unpp\I }
0pgY1i7 BOOL UnInit()
53OJ-m%a {
V'gw\mcb if(nHookCount>1){
3f76kl(& nHookCount--;
6][1<}8 return TRUE;
*nTU#U }
-9Ws=r0R BOOL unhooked = UnhookWindowsHookEx(hHook);
/VTM 9)u if(unhooked==TRUE){
y'M#z_.z nHookCount=0;
~H /2R hHook=NULL;
\h{r;#g }
saZ>?Owz return unhooked;
PX,rWkOce }
v."Dnl `
%?9=h% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>^_ bD {
8;\sU?
BOOL bAdded=FALSE;
2 WBq for(int index=0;index<MAX_KEY;index++){
H7g<
p" if(hCallWnd[index]==0){
!u;>Wyd W hCallWnd[index]=hWnd;
NCS!:d:Ry HotKey[index]=cKey;
)j&"%[2F HotKeyMask[index]=cMask;
F
# YPOH bAdded=TRUE;
'cd N3i( KeyCount++;
Iw=Sq8 break;
lE#m]D }
T1Ta?b }
)R)a@op return bAdded;
40P) 4w }
4FMF|U 6`H.%zM BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]$iN#d|ZU {
h
y-cG%f BOOL bRemoved=FALSE;
&xSa7FY for(int index=0;index<MAX_KEY;index++){
pBJAaCGm if(hCallWnd[index]==hWnd){
;3ft1 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
/CX VLl8~ hCallWnd[index]=NULL;
{padD p HotKey[index]=0;
`$RA< 3 HotKeyMask[index]=0;
rAqxTdF bRemoved=TRUE;
{I1~-8 KeyCount--;
]]iPEm"@ break;
WQePSU }
}iN2KeLAF }
9@VO+E$7L }
HK=[U9 o? return bRemoved;
NX6nQ }
' [0AHM d]v+mVAyE void VerifyWindow()
+V(5w`qx {
I=Zx"'Um for(int i=0;i<MAX_KEY;i++){
i76 Yo5 if(hCallWnd
!=NULL){ ?pGkk=,KB
if(!IsWindow(hCallWnd)){ %!j:fJ()
hCallWnd=NULL; #;tT8[Ewuw
HotKey=0; woOy*)@
HotKeyMask=0; %Z]'!X
KeyCount--; d5 j_6X
} le>Wm&E
} m~l
F`?
} kJK,6mN
} RuRt0Sd3
?w&SW{ I
BOOL CHookApp::InitInstance() x;E2~&E
{ |QZ58)>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ' P"g\;Ij
hins=AfxGetInstanceHandle(); [IBQvL
InitHotkey(); yubSj*
return CWinApp::InitInstance(); =!MY4&YX
} P>QpvSd_#
%"$@%"8;3
int CHookApp::ExitInstance() Yx d X#3
{ dKhA$f~
VerifyWindow(); 9h,u6e
UnInit(); 5_o$<\I\
return CWinApp::ExitInstance(); ./-JbW
} h1"zV6U
deX5yrvOie
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file )h$NS2B`
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wo^Sy41bF
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (&\aA 0-}H
#if _MSC_VER > 1000 T3&`<%,f
#pragma once &Vk; VM`5
#endif // _MSC_VER > 1000 !>^JSHR4t
S[:xqzyDg
class CCaptureDlg : public CDialog irBDGT~
{ g^>#^rLU
// Construction rw%l*xgX
public: !$qKb_#nC
BOOL bTray; i, n D5@#
BOOL bRegistered; ]rBM5~
BOOL RegisterHotkey(); )hKS0`$|
UCHAR cKey; }OShT+xeX
UCHAR cMask; GJ(d&o8
void DeleteIcon(); CZ{k@z`r
void AddIcon(); 2s ,8R
UINT nCount; P* #8ZMA<
void SaveBmp(); +{`yeZ9S
CCaptureDlg(CWnd* pParent = NULL); // standard constructor w=b(X
q+:
// Dialog Data *<V^2z$y_
//{{AFX_DATA(CCaptureDlg) 3yS
enum { IDD = IDD_CAPTURE_DIALOG }; TW&DFKK`
CComboBox m_Key; JN3cg
BOOL m_bControl; M~
h8Crz
BOOL m_bAlt; ^C^*,V3
BOOL m_bShift; %i{;r35M;9
CString m_Path; N]/!mo?
CString m_Number; |I8Mk.Z=FA
//}}AFX_DATA /i|z.nNO
// ClassWizard generated virtual function overrides d4^`}6@
//{{AFX_VIRTUAL(CCaptureDlg) Tp%(I"H'_;
public: QGnxQ{ko
virtual BOOL PreTranslateMessage(MSG* pMsg); 3eIr{xs
protected: 'md0] R|
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1qdZc_x
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); f>Td)s1
M
//}}AFX_VIRTUAL uYO|5a<f~
// Implementation 6iezLG5
protected: PFSLyV*
HICON m_hIcon; 1' w:`/_
// Generated message map functions !|wzf+V
//{{AFX_MSG(CCaptureDlg) eOlKbJU
virtual BOOL OnInitDialog(); (il0M=M
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tOdT[&
afx_msg void OnPaint(); qztV,R T
afx_msg HCURSOR OnQueryDragIcon(); > 6CV4 L
virtual void OnCancel(); E;\M1(\u
afx_msg void OnAbout(); WV<tyx9Z
afx_msg void OnBrowse(); (g8*d^u#PO
afx_msg void OnChange(); |KCOfVh?|.
//}}AFX_MSG m7]hJ,0
DECLARE_MESSAGE_MAP() c$E)P$<j
}; `i!wq&1g7
#endif P<dy3;
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////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D@Da0
#include "stdafx.h" 8pZ<9t'
#include "Capture.h" t@zdmy
#include "CaptureDlg.h" 'w/qcD-
#include <windowsx.h> "`tXA
#pragma comment(lib,"hook.lib") 0Dv JZ|e
#ifdef _DEBUG Jcf"#u-Q/
#define new DEBUG_NEW P8yIegPY
#undef THIS_FILE X~T/qFS
static char THIS_FILE[] = __FILE__; aC=['a>)
#endif ~Vh =5J~
#define IDM_SHELL WM_USER+1 }6zbT-i
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %FkLQ+v/<
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'JmBh@A
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qojXrSb"y
class CAboutDlg : public CDialog n$+M%}/f
{ }U5Y=RYo
public: ('k<XOi
CAboutDlg(); &]p}+{ (>
// Dialog Data ".2K9j7$
//{{AFX_DATA(CAboutDlg) f_mhD dq
enum { IDD = IDD_ABOUTBOX }; .QWhK|(.!
//}}AFX_DATA =jAFgwP\
// ClassWizard generated virtual function overrides x!7yU_ls`
//{{AFX_VIRTUAL(CAboutDlg) -$8.3\6h
protected: L_O$>c
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3fS}:!sQ
//}}AFX_VIRTUAL mX# "+X|
// Implementation %|Qw9sbd
protected: Y>6.t"?Q^
//{{AFX_MSG(CAboutDlg) B&KL2&Z~Pq
//}}AFX_MSG {ShgJ;! Q
DECLARE_MESSAGE_MAP() f4t.f*#
}; Un=a
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Q
s(Bnb;
{ y=N"=Z
//{{AFX_DATA_INIT(CAboutDlg) #*$p-I=
//}}AFX_DATA_INIT
!rL<5L
} J\co1kO9/
n@>wwp
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f[~1<;|-
{ -E>)j\{PX7
CDialog::DoDataExchange(pDX); lJ
//{{AFX_DATA_MAP(CAboutDlg) HOW7cV'X
//}}AFX_DATA_MAP .J.vC1 4gi
} 0irr7Y
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4*H"Z(HP
//{{AFX_MSG_MAP(CAboutDlg) 7}
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// No message handlers -$k>F#
//}}AFX_MSG_MAP [I+9dSM1t
END_MESSAGE_MAP()
'ig, ATY
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) gT52G?-
: CDialog(CCaptureDlg::IDD, pParent) 649 !=
{ 7k8n@39?
//{{AFX_DATA_INIT(CCaptureDlg) QJX/7RA
m_bControl = FALSE; @|A|
m_bAlt = FALSE; khX|"d360
m_bShift = FALSE; 2:^njqX
m_Path = _T("c:\\"); ? Nj)6_&
m_Number = _T("0 picture captured."); ^$?qT60%d|
nCount=0; APBK9ky
bRegistered=FALSE; Lk,+Tfk"
bTray=FALSE; h[Tk;h
//}}AFX_DATA_INIT ]r"Yqv3
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Zr/r2
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6SEltm(
} yY=<'{!
c[(Pg%
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n~r 9!m$<
{ wq0aF"k
CDialog::DoDataExchange(pDX); N +Sq}hI
//{{AFX_DATA_MAP(CCaptureDlg) 6].:.b\qQc
DDX_Control(pDX, IDC_KEY, m_Key); XAic9SNu;
DDX_Check(pDX, IDC_CONTROL, m_bControl); R{}qK r
DDX_Check(pDX, IDC_ALT, m_bAlt); :=. *I
DDX_Check(pDX, IDC_SHIFT, m_bShift); !k&)EWP?
DDX_Text(pDX, IDC_PATH, m_Path); l gq=GHW
DDX_Text(pDX, IDC_NUMBER, m_Number); p8>%Mflf
//}}AFX_DATA_MAP &r_uQbx
} fEqC] *s
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BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )2j:z#'>
//{{AFX_MSG_MAP(CCaptureDlg) bKz{wm%
ON_WM_SYSCOMMAND() 3VO:+mT
ON_WM_PAINT() \9m*(_Qf
ON_WM_QUERYDRAGICON() ?Myh7
ON_BN_CLICKED(ID_ABOUT, OnAbout) O.\h'3C
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7sV/_3H+
ON_BN_CLICKED(ID_CHANGE, OnChange) uH{'gd,q8
//}}AFX_MSG_MAP 5w3Fqu>39?
END_MESSAGE_MAP() 78Y@OL_$
h8v>zNf'
BOOL CCaptureDlg::OnInitDialog() ,;iA2
{ ;sQbn|=e"
CDialog::OnInitDialog(); s-D?)
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ([pSVOnIz
ASSERT(IDM_ABOUTBOX < 0xF000); oXal
CMenu* pSysMenu = GetSystemMenu(FALSE); rxE&fjW
if (pSysMenu != NULL) 0D3OE.$0
{ tbur$00
CString strAboutMenu; wq\G|/%
strAboutMenu.LoadString(IDS_ABOUTBOX); &?<AwtNN
if (!strAboutMenu.IsEmpty()) ~[18q+,
{ IC~ljy]y_
pSysMenu->AppendMenu(MF_SEPARATOR); &YX6"S_B
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); VXC4%
} %$n02"@
} dr]&kqm
SetIcon(m_hIcon, TRUE); // Set big icon &HF]\`RNr
SetIcon(m_hIcon, FALSE); // Set small icon _}=E^/;(
m_Key.SetCurSel(0); TVkcDS
RegisterHotkey(); $I8[BYblB
CMenu* pMenu=GetSystemMenu(FALSE); &9P<qU^N)
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a@W7<9fY;
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); OlGR<X
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r%-n*_?.s
return TRUE; // return TRUE unless you set the focus to a control TA;,>f*
} uBeNXOre
ntH T
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) P;GprJ`l
{ qx%jAs+~
if ((nID & 0xFFF0) == IDM_ABOUTBOX) >]/dOH,A
{ 'lQYJ0
CAboutDlg dlgAbout; ~ x`7)3
dlgAbout.DoModal(); ^, wnp@
} g!^J ,e=
else In(NF#
{ el*9 Ih
CDialog::OnSysCommand(nID, lParam); ~3 @*7B5Q
} Czu1 )y
} pGkef0p@
otnV-7)@
void CCaptureDlg::OnPaint() 0vckoE
{ _S5gcPcF"
if (IsIconic()) V/-MIH7SF
{ cjT[P"5$
CPaintDC dc(this); // device context for painting d}% (jJ(I
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `o-*Tr
// Center icon in client rectangle 6\`DlUn'*
int cxIcon = GetSystemMetrics(SM_CXICON); .mt^m
int cyIcon = GetSystemMetrics(SM_CYICON); }su6izx
CRect rect; s=/^lOOO
GetClientRect(&rect); rw*M&qg!z
int x = (rect.Width() - cxIcon + 1) / 2; t-EV h~D1p
int y = (rect.Height() - cyIcon + 1) / 2; B$7[8h
// Draw the icon VM;g+RRq
dc.DrawIcon(x, y, m_hIcon); e6m1NH4,
} f\'G`4e
else `.8-cz
{ PP4d?+;V
CDialog::OnPaint(); 5"2@NL
} =1Sy@M bH3
} MBO,\t.
MPG+B/P&
HCURSOR CCaptureDlg::OnQueryDragIcon() g RU-g
{ gV`S%
return (HCURSOR) m_hIcon; <G9<"{
} pn*d[M|k
2}!R
T
void CCaptureDlg::OnCancel() iiN?\OO^~
{ Sw
"|iBZ@
if(bTray) D;C5,rNt
DeleteIcon(); $Sw,hb
CDialog::OnCancel(); T#N80BH[
} Nuq(4Yf1W
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void CCaptureDlg::OnAbout() /&6Q)
{ !PI0oh
CAboutDlg dlg; !qS05
dlg.DoModal(); `axQd%:AC
} `D"1
gD}{A
S5/p=H:
void CCaptureDlg::OnBrowse() Bxt_a.LthH
{ un&>
CString str; dcP88!#5-
BROWSEINFO bi; w= B
char name[MAX_PATH]; >vxWx[fRu
ZeroMemory(&bi,sizeof(BROWSEINFO)); 1O4D+0@
bi.hwndOwner=GetSafeHwnd(); Vy r]
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bi.pszDisplayName=name; U,d2DAvt
bi.lpszTitle="Select folder"; vC-[#]<
bi.ulFlags=BIF_RETURNONLYFSDIRS; T7s+9CE
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2_I+mQ
if(idl==NULL) -G!6U2*#
return; o[imNy~ ~
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4V>vg2
d
str.ReleaseBuffer(); K"I{\/x@
m_Path=str; D/*vj|
if(str.GetAt(str.GetLength()-1)!='\\') &gJW6<
m_Path+="\\"; (E IR z>
UpdateData(FALSE); F*.
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} \CDAFu#
P 4H*jy@?
void CCaptureDlg::SaveBmp() aYR\ <02
{ 9Mnem*
CDC dc; CP@o,v-
dc.CreateDC("DISPLAY",NULL,NULL,NULL); bsMC#xT
CBitmap bm; |&(H^<+Xp
int Width=GetSystemMetrics(SM_CXSCREEN); o KlF5I
int Height=GetSystemMetrics(SM_CYSCREEN); Qw}xGlF,
bm.CreateCompatibleBitmap(&dc,Width,Height); VrudR#q
CDC tdc; E4hq}
tdc.CreateCompatibleDC(&dc); XWc|[>iO
CBitmap*pOld=tdc.SelectObject(&bm); 69-$Wn43<
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); y^, "gD
tdc.SelectObject(pOld); dZ-Ny_@&
BITMAP btm; EO"=\C,
bm.GetBitmap(&btm); Px$'(eMj^3
DWORD size=btm.bmWidthBytes*btm.bmHeight; ud.poh~|
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ItMl4P`|
BITMAPINFOHEADER bih; M$#+W?m&
bih.biBitCount=btm.bmBitsPixel; 01-p
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bih.biClrImportant=0; Q.<giBh
bih.biClrUsed=0; D8a)( wm
bih.biCompression=0; 5#P: "U
bih.biHeight=btm.bmHeight; 2"zI R(
bih.biPlanes=1; ^?#@[4?"
bih.biSize=sizeof(BITMAPINFOHEADER); ]y$)%J^T
bih.biSizeImage=size; [;Vi~$p|Eo
bih.biWidth=btm.bmWidth; rT o%=0P
bih.biXPelsPerMeter=0; 1XQ87~
bih.biYPelsPerMeter=0; YBR)s\*
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gca|?tt
static int filecount=0; gp%tMTI1
CString name; ?Z5$0-g'hU
name.Format("pict%04d.bmp",filecount++); uAC hu]
name=m_Path+name; =":@Foa
BITMAPFILEHEADER bfh; IM$'J
bfh.bfReserved1=bfh.bfReserved2=0; LxIuxt=X|p
bfh.bfType=((WORD)('M'<< 8)|'B'); `Nkx7Z~w:
bfh.bfSize=54+size; Qa>%[jx,@,
bfh.bfOffBits=54; ozT._C
CFile bf; byp.V_a}/
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ W5TqC
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >Zi|$@7t-
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); twAw01".
bf.WriteHuge(lpData,size); p0"BO4({{
bf.Close(); U9bFUK/z
nCount++; kVy"+ZebK
} FW/6{tm
GlobalFreePtr(lpData); 1a \=0=[
if(nCount==1) M_yZR^;^-
m_Number.Format("%d picture captured.",nCount); oC5gME"2
else N45s'rF
m_Number.Format("%d pictures captured.",nCount); OX'/?B((
UpdateData(FALSE); qdKh6{
} }o~Tw?z-|
)kFme=;
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]eY Qio!
{
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if(pMsg -> message == WM_KEYDOWN) :/ ~):tM
{ v\J!yz
if(pMsg -> wParam == VK_ESCAPE) =#7s+ d-
return TRUE; C,V|TF.i2
if(pMsg -> wParam == VK_RETURN) )tJL@Qo
return TRUE; Kv(Y }
} 3xc:Y>
*`
return CDialog::PreTranslateMessage(pMsg); 0^-z?Kb<}
} mm3zQ!2j.
=9#i<te
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @oUf}rMiDa
{ Lx9hq7<
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,oy4V ^B&
SaveBmp(); *9\oD~2Y
return FALSE; #1gTpb+t
} 9?EY.}~
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ LPtx|Sx![
CMenu pop; PGC07U:B
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <!$j9) ~x
CMenu*pMenu=pop.GetSubMenu(0); 0]f?Dx/8
pMenu->SetDefaultItem(ID_EXITICON); {6REfY
c
CPoint pt; @`#OC#
GetCursorPos(&pt); Q&\ZC?y4
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); TiwHLb9
if(id==ID_EXITICON) :FEd:0TS
DeleteIcon(); J$o[$G_Z
else if(id==ID_EXIT) 1',+&2)oj
OnCancel(); "i;*\+x
return FALSE; 18l~4"|fk
} Z3&XTsq
LRESULT res= CDialog::WindowProc(message, wParam, lParam); T#ecLD#
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2d,wrC<'$
AddIcon(); Ktj(&/~}
return res; T1Ln)CS?9
} 1KfJl S+
#$9U=^Z[
void CCaptureDlg::AddIcon() 2nOe^X!*
{ 9&?tQ"@x
NOTIFYICONDATA data; KyVe0>{_u
data.cbSize=sizeof(NOTIFYICONDATA); &@Ji+
CString tip; 6'3Ey'drH
tip.LoadString(IDS_ICONTIP); 6EW"8RG`
data.hIcon=GetIcon(0); 4c493QOd
data.hWnd=GetSafeHwnd(); r-Xjy*T
strcpy(data.szTip,tip); /
r`Y'rm
data.uCallbackMessage=IDM_SHELL; ZVCv(J
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; JC1BUheeb
data.uID=98; Y+S~b
Shell_NotifyIcon(NIM_ADD,&data); ^ ^U)WB
ShowWindow(SW_HIDE); D(W7O>5vQ2
bTray=TRUE; t/4/G']W
} !YuON6{)
M$E8:
void CCaptureDlg::DeleteIcon() *;~{_Disz
{ k;9#4^4(
NOTIFYICONDATA data; O;.d4pO(tC
data.cbSize=sizeof(NOTIFYICONDATA); I+-Rs2wb
data.hWnd=GetSafeHwnd(); IrVM|8vT3
data.uID=98; |G5=>W
Shell_NotifyIcon(NIM_DELETE,&data); iyHp$~,q?t
ShowWindow(SW_SHOW); Av\0GqF
SetForegroundWindow(); HvL9;^!
ShowWindow(SW_SHOWNORMAL); Q'vIeG"o
bTray=FALSE; eFeCS{LV+
} 'JXN*YO
"@):*3
4
void CCaptureDlg::OnChange() @5POgQ8
{ [K^q:3R
RegisterHotkey(); B@:XC&R^
} P-*RN
6'X.[0M
BOOL CCaptureDlg::RegisterHotkey() X]f#w
{ k/6Gj}l'o
UpdateData(); FL*w(Br.
UCHAR mask=0;
Q}`2Y^.
UCHAR key=0; pRa oR
if(m_bControl)
s2
t-T0;
mask|=4; Y?q*hS0!H
if(m_bAlt) 2R~=@
mask|=2; 5 }(YMsUb
if(m_bShift) 9fk\Ay1P
mask|=1; knj,[7uh
key=Key_Table[m_Key.GetCurSel()]; R _~m\P
if(bRegistered){ YQw/[
DeleteHotkey(GetSafeHwnd(),cKey,cMask); LP-KD
bRegistered=FALSE; KfN`ZZ<
} Yqj.z| }Nb
cMask=mask;
\1c`)
cKey=key; zke~!"iq
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +P<w<GfQ
return bRegistered; JhhT7\h(
} )r-|T&Sn
*~MiL9m+?
四、小结 X_Of k
M@z_Z+q9
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。