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:
ibw;BU
}`FPe 一、实现方法
S`KCVQ>V nP31jm+A 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:
Q6>( Z OG`Oi^2 #pragma data_seg("shareddata")
ZW%`G@d"H- HHOOK hHook =NULL; //钩子句柄
e84TLU?~ UINT nHookCount =0; //挂接的程序数目
s'4p+eJ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
)>p6h]]a static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
WE]^w3n9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
{NDP}UATw static int KeyCount =0;
a| cD{d static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
*[n^6) #pragma data_seg()
:[3\jLrc 8ipLq`) 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。
g2q=&eI" lh5d6VUA 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:
XU7bWafy ` 454=3H BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
6B{Awm@v}X cKey,UCHAR cMask)
iN*@f8gf {
_3S{n=9 BOOL bAdded=FALSE;
pnU
g:R@ for(int index=0;index<MAX_KEY;index++){
.YRSd if(hCallWnd[index]==0){
Xv:IbM>
Qc hCallWnd[index]=hWnd;
*93 N0m4Rl HotKey[index]=cKey;
&EOh}O< HotKeyMask[index]=cMask;
+n dyR bAdded=TRUE;
Le!I-i(aD KeyCount++;
4{KsCd) break;
ND>}t#^$ }
(Q+3aEUE }
VUb*,/hxa return bAdded;
YBP{4Rl }
(1^(V)@ //删除热键
SH.'E Hd BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
)EoG@:[ {
T2{+fRvN BOOL bRemoved=FALSE;
UsTPNQj for(int index=0;index<MAX_KEY;index++){
wah` if(hCallWnd[index]==hWnd){
hj4Rr(T if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
y(k2p hCallWnd[index]=NULL;
&bRH(yF HotKey[index]=0;
o[6hUX0tN HotKeyMask[index]=0;
$u :=lA:N bRemoved=TRUE;
@w0[5ZAj KeyCount--;
FQyiIT6 break;
D }\`5L< }
jo^*R'} }
,o)MiR9-[A }
_*9Zp1r return bRemoved;
Gm.hBNgp }
uOQ5.S+ 4]bT O abND#t DLL中的钩子函数如下:
|j,Mof #d~"bn q;c LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
yrjm0BM# {
nTAsy0p] BOOL bProcessed=FALSE;
?P5D!b:( if(HC_ACTION==nCode)
^?2txLv,6 {
VxCH}&! if((lParam&0xc0000000)==0xc0000000){// 有键松开
OH~t\fQ1Zf switch(wParam)
}=U\v'%m {
v!,O7XGH~ case VK_MENU:
j!s&yHE1 MaskBits&=~ALTBIT;
b Y>Ug{O; break;
181P;R=}< case VK_CONTROL:
"#7i-?= MaskBits&=~CTRLBIT;
'|Oi#S break;
EY>A(
case VK_SHIFT:
=N=,;<6%A MaskBits&=~SHIFTBIT;
iB?@(10}ES break;
&[YG\8sxWa default: //judge the key and send message
N(9'U0z break;
9hv\%_>o }
=4zsAa for(int index=0;index<MAX_KEY;index++){
]HRZ9oP if(hCallWnd[index]==NULL)
$H#&.IjY continue;
& zG= if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
rdb%/@.- {
"\9@gfsp) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
en bProcessed=TRUE;
4Mprc~ 7vr }
Cpj_mMtu }
8[DD=[& }
,
?%`Ky/ else if((lParam&0xc000ffff)==1){ //有键按下
$*PyzLS switch(wParam)
MwuH.# Ez {
pK3cg|} case VK_MENU:
0`x<sjG\q MaskBits|=ALTBIT;
p])km%zB( break;
#zXDh3%]a case VK_CONTROL:
u7/M>YJ`T MaskBits|=CTRLBIT;
d1,azM break;
[J^,_iN[. case VK_SHIFT:
}$7Hf+G MaskBits|=SHIFTBIT;
f5G17: Q break;
wy^>i$TC default: //judge the key and send message
+?c&Gazi break;
H(pOR<` }
K9*K4'#R for(int index=0;index<MAX_KEY;index++){
B82A:t) if(hCallWnd[index]==NULL)
t*DM^.@ continue;
%|;^[^7+}t if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
l"cYW9 {
Dk4Wj"LS SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
nBNZ@nD bProcessed=TRUE;
6s Pd")%G }
)X@(>b{ }
"aP/214Ul }
nZ{~@E2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
rz3&khi for(int index=0;index<MAX_KEY;index++){
eQ*gnV}rE% if(hCallWnd[index]==NULL)
ue`F| continue;
!0w'S>e if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
K,So#Ui SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
_ p?q/-[4 //lParam的意义可看MSDN中WM_KEYDOWN部分
xUG|@xIwc }
?56Zw"89 }
UP,(zKTA }
&Zf@vD return CallNextHookEx( hHook, nCode, wParam, lParam );
|5O%@ }
"['YMhu_ v+\E%H 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:
p1 o?^A& {!=IGFe BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
wngxVhu8Ld BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
@]OI(B #Q;#A |EZ 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:
<H$ CCo o XGf#>keg LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
C#gQJ=!B {
1Og9VG1^ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
U_14CLsdG {
,x_g|J _Y //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
0m?ul%= SaveBmp();
z`TI<B return FALSE;
\0b",|"3 }
[V1gj9t=, …… //其它处理及默认处理
i~\gEMaO }
FL` . (, 0wOgQ n {a>)VZw_# 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。
u<+;]8[o S?D2`b 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。
EkJo.'0@ *gBaF/C 二、编程步骤
@GGyiK@ Q>X ;7nt0 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";
2*Gl|@~N :CH'Bt4< 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Ju:=-5r"' ytJ |jgp' 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;
2wu
5`Z[E n)pBK>+ 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;
qHvW{0E 7\jH?Zi 5、 添加代码,编译运行程序。
OxqP:kM QO|ODW+D 三、程序代码
M`"2; +LrW#K; ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
\2~.r/`1 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
I\4I,ds #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
]QpR>b=[j #if _MSC_VER > 1000
k"AY7vq@!P #pragma once
9#_49euy|P #endif // _MSC_VER > 1000
!hJ%{. #ifndef __AFXWIN_H__
Q}I. UG_ #error include 'stdafx.h' before including this file for PCH
4CNK ]2 #endif
#He:p$43 #include "resource.h" // main symbols
Ot v{#bB$ class CHookApp : public CWinApp
lJq
%me;4m {
@Wdnc/o] public:
d[ {=/~0 CHookApp();
^QXUiXzl // Overrides
)Q9J, // ClassWizard generated virtual function overrides
$KtMv +m" //{{AFX_VIRTUAL(CHookApp)
w}7`Vas9 public:
:%s9<g;-h_ virtual BOOL InitInstance();
>2N`l virtual int ExitInstance();
ujDAs%6MZ //}}AFX_VIRTUAL
Hjlx,:'M //{{AFX_MSG(CHookApp)
|n]^gTJt // NOTE - the ClassWizard will add and remove member functions here.
t+66kB N // DO NOT EDIT what you see in these blocks of generated code !
UIzk-.< //}}AFX_MSG
3):7mE( DECLARE_MESSAGE_MAP()
R(x%<I };
_Z 9I') LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
4?8GK BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
UlQ }
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
mAXTO7 BOOL InitHotkey();
BXm{x6\ BOOL UnInit();
M}us^t* #endif
?ILNp`k r`6XF //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
,{YC|uB #include "stdafx.h"
arDY@o~ #include "hook.h"
}8 ,b;Q #include <windowsx.h>
R-Uj\M> #ifdef _DEBUG
7dxY07yu #define new DEBUG_NEW
\b~zyt6- #undef THIS_FILE
%K?~$;Z. static char THIS_FILE[] = __FILE__;
5E~][. d #endif
6V!yfps) #define MAX_KEY 100
0(0Ep(Vj #define CTRLBIT 0x04
e@@kTny( #define ALTBIT 0x02
sE]eIN #define SHIFTBIT 0x01
gM_Z/$ #pragma data_seg("shareddata")
_es>G'S HHOOK hHook =NULL;
Z=n& fsE UINT nHookCount =0;
H2rh$2
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
7*u0)Hog static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
4AUY8Pxp static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
dqPJ 2j $\ static int KeyCount =0;
^Fy)
oWS static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&\K,kS [.r #pragma data_seg()
W9.ZhpM HINSTANCE hins;
Sd}fse void VerifyWindow();
hnH:G`[F BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
)Z"7^i //{{AFX_MSG_MAP(CHookApp)
9O P
d'f // NOTE - the ClassWizard will add and remove mapping macros here.
nn5S 7! // DO NOT EDIT what you see in these blocks of generated code!
vy6NH5Q //}}AFX_MSG_MAP
'$l*FWOEal END_MESSAGE_MAP()
EGU?54 S\GG(#b! CHookApp::CHookApp()
\-`L}$ {
h.=YAcR0D // TODO: add construction code here,
69\0$O // Place all significant initialization in InitInstance
x&8fmUS:@; }
)` ' B% BO CHookApp theApp;
tWL9>7]G LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Sr%~
5Q[W {
}+ I
8l' BOOL bProcessed=FALSE;
\ssuO if(HC_ACTION==nCode)
i8u9~F {
.|x0du| if((lParam&0xc0000000)==0xc0000000){// Key up
vqv(KsD+:: switch(wParam)
024*IoVZ {
ZVgR7+`]# case VK_MENU:
es&+5 MaskBits&=~ALTBIT;
(f
$Y0;v>} break;
32YE% case VK_CONTROL:
|oPqX %? MaskBits&=~CTRLBIT;
g 9>p?XY break;
SJIJV6}H case VK_SHIFT:
OlMCF.W#3 MaskBits&=~SHIFTBIT;
#d(6q$IE break;
N~Ax78TX default: //judge the key and send message
UU$ +DL break;
- stSl* }
ely&'y! for(int index=0;index<MAX_KEY;index++){
(:M6*RV if(hCallWnd[index]==NULL)
tJ2l_M^ continue;
%Xkynso~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
oPm1`x {
r(%#@?& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
*l_1T4]S bProcessed=TRUE;
an0@EkZ }
G'}%m;-mt }
q35%t61Lc }
t~,!a? S7 else if((lParam&0xc000ffff)==1){ //Key down
khc5h^0 switch(wParam)
89+m?H]K {
&'T7 ~M: case VK_MENU:
_aa3Qwx MaskBits|=ALTBIT;
%C'!L]# break;
)Ky0q-W case VK_CONTROL:
Kd7OnU MaskBits|=CTRLBIT;
$].< / break;
O#cXvv]Z* case VK_SHIFT:
O:p~L`o>> MaskBits|=SHIFTBIT;
k<8: break;
&$< S1 default: //judge the key and send message
DV{Qbe#In break;
jpOi Eo }
,i,f1XJ| for(int index=0;index<MAX_KEY;index++)
J=zh+oLCV {
5x4(5c5^ if(hCallWnd[index]==NULL)
T"dWrtO continue;
lq1pgM ?Kf if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Ms^,]Q1{ {
yZdM4` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
d=H C;T) bProcessed=TRUE;
oAv L?2 }
\T<?=A }
rf^1%Zo: }
|/YT.c% if(!bProcessed){
]#+fQR$! for(int index=0;index<MAX_KEY;index++){
`Z/"Dd;F^3 if(hCallWnd[index]==NULL)
"sL#)<% continue;
a"#5JcR3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
M6y:ze SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
!3?HpR/nV }
*<s|WLMG }
CW, Kw }
#{i\t E return CallNextHookEx( hHook, nCode, wParam, lParam );
0'VwObq }
!63x^# kg hbxG BOOL InitHotkey()
5I t+ S+a {
Jr\4x7a;`~ if(hHook!=NULL){
I9k o*f nHookCount++;
FW=oP>f]w return TRUE;
8;Yx a8i e }
@/B&R^aVZ else
T4J(8!7 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!XzRV?Ih; if(hHook!=NULL)
60^dzi!vs nHookCount++;
VT;$:>!+ return (hHook!=NULL);
b@z/6y! }
vSPkm)O0) BOOL UnInit()
O6lj^
{
'd0]`2tVg4 if(nHookCount>1){
/_aFQ>.4n nHookCount--;
fZT=q^26 return TRUE;
GC#3{71 }
6\/C]![% BOOL unhooked = UnhookWindowsHookEx(hHook);
V= !!;KR0 if(unhooked==TRUE){
WPCaxA+l nHookCount=0;
;la(Q~# hHook=NULL;
ON]
z- }
'SvYZ0ot return unhooked;
9.D'! }
2c_#q1/Z/ 0bS\VUB( BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(lTM^3
} {
kImS'i{A BOOL bAdded=FALSE;
k0!b@
c for(int index=0;index<MAX_KEY;index++){
5e6]v2 k if(hCallWnd[index]==0){
@/E5$mX` hCallWnd[index]=hWnd;
.E"hsGH9h HotKey[index]=cKey;
d7N}-nsB HotKeyMask[index]=cMask;
H'&x4[J: bAdded=TRUE;
]B5q v6 KeyCount++;
(7;}F~?h break;
ja#E}`wC4 }
qOqQt=ObU }
((B7k{` return bAdded;
t'
o:aI }
^<.mUaP yL7a*C& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
-c~nmPEG6 {
E,>/6AU BOOL bRemoved=FALSE;
/P Qz$e-!Y for(int index=0;index<MAX_KEY;index++){
(/-2bO if(hCallWnd[index]==hWnd){
ggzg,~V if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
&C`t(e hCallWnd[index]=NULL;
Pp*|EW 1 HotKey[index]=0;
Ma2sQW\ HotKeyMask[index]=0;
7D@O:yO bRemoved=TRUE;
`lRZQ:27X KeyCount--;
W}50E.\# break;
-WWa`,: }
n?
e&I>1W }
v2 T+I]I }
j,Eo/f+j5 return bRemoved;
"M3R}<Vt }
[nZ3}o A36 dj void VerifyWindow()
@{_[bKg {
sk5h_[tK for(int i=0;i<MAX_KEY;i++){
NuRxk eEO if(hCallWnd
!=NULL){ dq+VW}[EO
if(!IsWindow(hCallWnd)){ F.<sKQ&A
hCallWnd=NULL; R^.E";/h
HotKey=0; _DnZ=&=MA
HotKeyMask=0; (j@3=-%6 G
KeyCount--; {dM18;
} 3xj
?}o
} 8=Xy19<;t
} j"{|* _6E_
} pTT7#b(t
%JF.m$-
BOOL CHookApp::InitInstance() tgCEz%
{ xE`uFHuS}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,_
}
hins=AfxGetInstanceHandle(); :Q@=;P2
InitHotkey(); 5v
>0$Y{
return CWinApp::InitInstance(); \ bNN]=
} mxt fKPb
9.:r;H G
int CHookApp::ExitInstance() fTQRn
{ r%QTUuRXC3
VerifyWindow(); b9b384Q1O
UnInit(); 0%$E^`
return CWinApp::ExitInstance(); \ <b-I
} AJ1(q:P
;;#28nV
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +0)s{?
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /D2
cY>
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *S ,5
#if _MSC_VER > 1000 &Z3g$R 9
#pragma once M#ED49Dh>
#endif // _MSC_VER > 1000 Hs,pY(l^
.hO) R.
class CCaptureDlg : public CDialog 0$Rl78>(
{ G>"=Af(t?Y
// Construction 8ExEhBX8
public: $3.hZx>
BOOL bTray; 5~)m6]-6
BOOL bRegistered; =M39I&N
BOOL RegisterHotkey(); eb%`ox@&
UCHAR cKey; euO!vLd X
UCHAR cMask; ai|d`:;
void DeleteIcon(); )*6]m1
void AddIcon(); $hv o^$
UINT nCount; N<XS-XB,
void SaveBmp(); ,n)f=q*%
CCaptureDlg(CWnd* pParent = NULL); // standard constructor R)}ab{A
// Dialog Data 4I&e_b< 30
//{{AFX_DATA(CCaptureDlg) %#7NCdk;S
enum { IDD = IDD_CAPTURE_DIALOG }; m][i-|@M
CComboBox m_Key; Qy< ~{6V
BOOL m_bControl; %2)B.qTp&
BOOL m_bAlt; [3KP@'52k
BOOL m_bShift; M`m-@z
CString m_Path; R1A|g=kF
CString m_Number; VSf<(udGr
//}}AFX_DATA
%4
// ClassWizard generated virtual function overrides -l)u`f^n|
//{{AFX_VIRTUAL(CCaptureDlg) [22>)1<(
public: kF,_o/Jc
virtual BOOL PreTranslateMessage(MSG* pMsg); c-s A?q#|
protected: CSu}_$wC#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
AW[_k%
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ih RWa|{I
//}}AFX_VIRTUAL <d`ksZ+
// Implementation L_ &`
protected: ,\".|m1o.
HICON m_hIcon; nogdOGo
// Generated message map functions CRpMpPi@}
//{{AFX_MSG(CCaptureDlg) qHQWiu%h
virtual BOOL OnInitDialog(); ^*-6PV#Z
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |:[
[w&R
afx_msg void OnPaint(); o$4xinK
afx_msg HCURSOR OnQueryDragIcon(); T ?HG}(2
virtual void OnCancel(); }hoyjzv]L
afx_msg void OnAbout(); *PSUB{i(
afx_msg void OnBrowse(); %qI.Qw$
afx_msg void OnChange(); Y<vHL<G
//}}AFX_MSG [>MPM$9F-m
DECLARE_MESSAGE_MAP() kuX{2h*`
}; f$2DV:wuC
#endif -G|?Kl
%k+G-oT5
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Mtw7aK
#include "stdafx.h" Q"(*SA+-|
#include "Capture.h" AP:(/@K|
#include "CaptureDlg.h" t5M"M{V
#include <windowsx.h> @,\J\ rb
#pragma comment(lib,"hook.lib") P #PRzt
#ifdef _DEBUG WL#E%6p[
#define new DEBUG_NEW 9-`P\/
#undef THIS_FILE GxynLXWo>
static char THIS_FILE[] = __FILE__; e$t$,3~
#endif %@,!
(
#define IDM_SHELL WM_USER+1 (\zxiK
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z&Kh$ $)[
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eE0'3?q(
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; '<R::M,
class CAboutDlg : public CDialog t(.jJ>|+*
{ Cx[Cst`
public: n@PXC8}
CAboutDlg(); Hgk@I;
// Dialog Data . l>.
//{{AFX_DATA(CAboutDlg) !8@8
enum { IDD = IDD_ABOUTBOX }; #*~3gMI{=
//}}AFX_DATA k>V~iA
// ClassWizard generated virtual function overrides ;4s7\9o
//{{AFX_VIRTUAL(CAboutDlg) 8bf~uHAr
protected: ? `+G0VT
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G5T(
//}}AFX_VIRTUAL ZP(T=Q
// Implementation 2,^U8/
protected: C.(<IcSG
//{{AFX_MSG(CAboutDlg) 3;<Vv*a"Dm
//}}AFX_MSG ?#obNQ"u]
DECLARE_MESSAGE_MAP() Kj/{V
}; 6Z>G%yK
3DX@ggE2
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -E+LA
{ Dwa.ZY}-
//{{AFX_DATA_INIT(CAboutDlg) Uip-qWI
//}}AFX_DATA_INIT ur|
vh5
} nqC@dHP
4%"Df1U
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "59"HVV
{ iu.$P-s
CDialog::DoDataExchange(pDX); ;4Wz0suf
//{{AFX_DATA_MAP(CAboutDlg) uMb[0-5
//}}AFX_DATA_MAP Dk#4^`qp1
} 3ahbv%y
l",X
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3:?QE
//{{AFX_MSG_MAP(CAboutDlg) & oj$h
// No message handlers Mq Q'Kjo
//}}AFX_MSG_MAP |576)
END_MESSAGE_MAP() #V U>Z|$@N
/kc@ELl
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qE@H~&
: CDialog(CCaptureDlg::IDD, pParent) Tr$37suF
{ l % 0c{E~
//{{AFX_DATA_INIT(CCaptureDlg) rvRIKc|}l
m_bControl = FALSE; [t+qYe8
m_bAlt = FALSE; R&@NFin
m_bShift = FALSE; Z11I1)%s
m_Path = _T("c:\\"); 5]F4.sa
m_Number = _T("0 picture captured."); C%q]o
nCount=0; }S=m :
VKH
bRegistered=FALSE; ot;
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bTray=FALSE; FKU)# Eo
//}}AFX_DATA_INIT @M=\u-jJ.
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 gI{56Z
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =(Pk7{
} 4)].{Z4q
@tVl8]y
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -}KW"#9c
{ TLT6z[
CDialog::DoDataExchange(pDX); 5O]eD84B
//{{AFX_DATA_MAP(CCaptureDlg) @jT=SFf
DDX_Control(pDX, IDC_KEY, m_Key); :~LOw}N!aQ
DDX_Check(pDX, IDC_CONTROL, m_bControl); wt1Y&D
DDX_Check(pDX, IDC_ALT, m_bAlt); >e^8fpgSo
DDX_Check(pDX, IDC_SHIFT, m_bShift); Igb%bO_
DDX_Text(pDX, IDC_PATH, m_Path); m4 :"c"
DDX_Text(pDX, IDC_NUMBER, m_Number); @X]JMicJ
//}}AFX_DATA_MAP )@E'yHYO>
} ~NZ}@J{00_
Dac ,yW
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =0mXTY1
//{{AFX_MSG_MAP(CCaptureDlg) 4ad-'
ON_WM_SYSCOMMAND() ^#&PTq>
ON_WM_PAINT() ea6`%,lF~
ON_WM_QUERYDRAGICON() }-%:!*bLj
ON_BN_CLICKED(ID_ABOUT, OnAbout) yPT\9"/
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4{#0ci{
ON_BN_CLICKED(ID_CHANGE, OnChange) #p/'5lA&j
//}}AFX_MSG_MAP x_OZdI
END_MESSAGE_MAP() tN-B`d1
BBHoD:l
BOOL CCaptureDlg::OnInitDialog() ?RU_SCp-
{ Z.3*sp0
yv
CDialog::OnInitDialog(); B5MEE
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); L,*#
ASSERT(IDM_ABOUTBOX < 0xF000); != u
S
CMenu* pSysMenu = GetSystemMenu(FALSE); j\TS:F^z
if (pSysMenu != NULL) O^<\]_l
{ L]QBh\
CString strAboutMenu; 0&2eiMKG?n
strAboutMenu.LoadString(IDS_ABOUTBOX); QR*{}`+l
if (!strAboutMenu.IsEmpty()) BTa#}LBZ+
{ )d7U3i
pSysMenu->AppendMenu(MF_SEPARATOR); #}aBRKZf6
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); MVZ9x%
} G:Cgq\+R
} :AM_C^j~
D
SetIcon(m_hIcon, TRUE); // Set big icon B+2Jea,N
SetIcon(m_hIcon, FALSE); // Set small icon y3!#*NU
m_Key.SetCurSel(0); %tZ[wwt
RegisterHotkey(); 0=c:O
CMenu* pMenu=GetSystemMenu(FALSE); ^9 {r2d&c
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); k{ibD5B
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0]MI*s>&
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); p5 )+R/
return TRUE; // return TRUE unless you set the focus to a control D[bPm:\0M
} x(bM
mBWhC<kKs
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *D;VZs0O
{ <PTi>C8;r
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Y"'k $jS-
{ nQM7@"R
CAboutDlg dlgAbout; =*Y=u6?
dlgAbout.DoModal(); o!}/&
'(
} wm
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else w"?E=RS
{ Eumdv#Qg
CDialog::OnSysCommand(nID, lParam); ^9xsbv
B0
} 6HxZS+],c
} Jej-b<HmQ
uc-Go
6W
void CCaptureDlg::OnPaint() ~#V1Gunq
{ O!.mc=Gx7
if (IsIconic()) jN^09T49
{ qD/FxR-!
CPaintDC dc(this); // device context for painting i"U<=~
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :h)A/k_
// Center icon in client rectangle U&<w{cuA
int cxIcon = GetSystemMetrics(SM_CXICON); nO7#m~
int cyIcon = GetSystemMetrics(SM_CYICON); ZeP3
Yjr3
CRect rect; ?jRyw(Q
GetClientRect(&rect); 'ktWKW$
D
int x = (rect.Width() - cxIcon + 1) / 2; mB]Y;R<
int y = (rect.Height() - cyIcon + 1) / 2; +jpC%o}C
// Draw the icon w-(^w9_e
dc.DrawIcon(x, y, m_hIcon); HnmByn\j
} n*U+jc
else 8/* 6&#-
{ yyVv@
CDialog::OnPaint(); 1O]27"9
} #3o]Qo[Sc
} "JCvsCe
"7tEk<x
HCURSOR CCaptureDlg::OnQueryDragIcon() !%_H1jk
{ 95CCje{o_
return (HCURSOR) m_hIcon; o4g<[X)
} sCF7K=a
UCP4w@C
void CCaptureDlg::OnCancel() 9AROvq|#
{ WxFrqUz
if(bTray) %<Q?|}
DeleteIcon(); LYY|8)Nj2"
CDialog::OnCancel(); bs_"Nn?
} P"WnU'+
&]2z)&a
void CCaptureDlg::OnAbout() H21\6 GY
{ ,3{z_Rax-
CAboutDlg dlg; wbaXRvg
dlg.DoModal(); &G>EBKn\2`
} VIxt;yE
}Rc8\,
void CCaptureDlg::OnBrowse() ]'UO]i/
{ U-#t&yjh#
CString str; {m/\AG)1I
BROWSEINFO bi; $I7/FZP
char name[MAX_PATH]; hC.7Z]
ZeroMemory(&bi,sizeof(BROWSEINFO)); G/Xa`4"_
bi.hwndOwner=GetSafeHwnd(); t;@VsQ8
bi.pszDisplayName=name; )oSUhU26}
bi.lpszTitle="Select folder"; [k9aY$baT^
bi.ulFlags=BIF_RETURNONLYFSDIRS; ZN2g(
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2dr[0tE
if(idl==NULL) qG/a5i
return; [Pdm1]":(
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pX]*&[X?
str.ReleaseBuffer(); *a@pZI0'
m_Path=str; ~7!J/LHg
if(str.GetAt(str.GetLength()-1)!='\\') j:0VtJo~
m_Path+="\\"; ?'K}bmdt}.
UpdateData(FALSE); daaEN(
} >qjr7 vx
aho;HM$hjP
void CCaptureDlg::SaveBmp() *0y+=,"QU
{ 'f<0&Ci8
CDC dc; j8@YoD5o
dc.CreateDC("DISPLAY",NULL,NULL,NULL); _VR Sdr5
CBitmap bm; &j/ WjZPF
int Width=GetSystemMetrics(SM_CXSCREEN); \qAMs^1-
int Height=GetSystemMetrics(SM_CYSCREEN); &{* [7Ad
bm.CreateCompatibleBitmap(&dc,Width,Height); g?M\Z";
CDC tdc; $.(>Sj1
tdc.CreateCompatibleDC(&dc); K$Y!d"D
CBitmap*pOld=tdc.SelectObject(&bm); Zb7KHKO{
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r]km1SrS
tdc.SelectObject(pOld); A$W,#`E
BITMAP btm; _{,e-_hYM
bm.GetBitmap(&btm); KS'? DO
DWORD size=btm.bmWidthBytes*btm.bmHeight; ReP7c3D>p
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); tCK%vd%
BITMAPINFOHEADER bih; au574tj
bih.biBitCount=btm.bmBitsPixel; gyieS Xz[
bih.biClrImportant=0; PP&AF?C
bih.biClrUsed=0; &oYX093di
bih.biCompression=0; m$A|Sx&sG$
bih.biHeight=btm.bmHeight; Rs8`M8(4%
bih.biPlanes=1; ^o|igyS9
bih.biSize=sizeof(BITMAPINFOHEADER); R3&W.?C
T
bih.biSizeImage=size; R{@WlkG}
bih.biWidth=btm.bmWidth; ?`,UW; Br6
bih.biXPelsPerMeter=0; a)4.[+wnRf
bih.biYPelsPerMeter=0; T\b
e(@r
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BG~h9.c
static int filecount=0; fT/;TK>z>
CString name; 3Zdkf]Gh
name.Format("pict%04d.bmp",filecount++); 8@Xq ,J
name=m_Path+name; $~50M5&K#
BITMAPFILEHEADER bfh; [1dlV/
bfh.bfReserved1=bfh.bfReserved2=0; "m _wYX
bfh.bfType=((WORD)('M'<< 8)|'B');
zfO0+fMH
bfh.bfSize=54+size; qWtvo';3
bfh.bfOffBits=54; =wPl;SDf!
CFile bf; 1Xt%O86
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }Hrm/Ni
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {G/4#r
2>
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?W9$=
bf.WriteHuge(lpData,size); M2[;b+W9
bf.Close(); 4{X5ZS?CkI
nCount++; zm9>"(H
} -2w\8]u
GlobalFreePtr(lpData); }9aYU;9D
if(nCount==1) l^%Ez?-:s
m_Number.Format("%d picture captured.",nCount); i(2s"Uww,
else %w=*4!NWb
m_Number.Format("%d pictures captured.",nCount); :o&qJ%
UpdateData(FALSE); bwqla43gX
} "D2`=D!+
votv rZ=
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -k|r#^(G2
{ \eT0d<
if(pMsg -> message == WM_KEYDOWN) ga?.7F
{ )Pakb!0H@t
if(pMsg -> wParam == VK_ESCAPE) ib0M$Y1tIS
return TRUE; >pbO\=j]X
if(pMsg -> wParam == VK_RETURN) "b8<C>wY
return TRUE; D4ESo)15'
} 7;)
T;X
return CDialog::PreTranslateMessage(pMsg); p2GkI/6)uu
} ly7\H3
r;g[<6`!S
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !<Ma9%uC{
{ .EM0R\q
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7$b!-I+a2
SaveBmp(); A7 qyv0F
return FALSE; %(MaH
} 3~;LNi
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mFw`LvH?*
CMenu pop; *8M0h9S$
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ARGtWW~:
CMenu*pMenu=pop.GetSubMenu(0); n#Q ;bSw
pMenu->SetDefaultItem(ID_EXITICON); __fa,kK {?
CPoint pt; U$&G_&*0a
GetCursorPos(&pt); Ly"u }e
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =&;orP
if(id==ID_EXITICON) Aw~
=U!
DeleteIcon(); rG|lRT3-K
else if(id==ID_EXIT) y[:\kI
OnCancel(); ?&
qM C
return FALSE; XZD9vFj1Z
} 0}C> e`<'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); thy)J.<J
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dQT A^m
AddIcon(); 1O]'iS"
return res; B+[ri&6X\
} gBp,p\ Xc
&TJMop Vn
void CCaptureDlg::AddIcon() }'L7< _
{ >-J%=P
NOTIFYICONDATA data; .sI*\@w.
data.cbSize=sizeof(NOTIFYICONDATA); 44C"Pl
E
u
CString tip; (k/[/`3ST
tip.LoadString(IDS_ICONTIP); oS6dcJHf
data.hIcon=GetIcon(0); ;,2i1m0"
data.hWnd=GetSafeHwnd(); +a1Or
strcpy(data.szTip,tip); ,' VT75
data.uCallbackMessage=IDM_SHELL; cCx@VT`0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B_R
J;.oH
data.uID=98; @`R#t3)8JP
Shell_NotifyIcon(NIM_ADD,&data); omz%:'m`~
ShowWindow(SW_HIDE); ;e
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bTray=TRUE; qaJ$0,]H+
} z ntvKOIh
RP[^1
void CCaptureDlg::DeleteIcon() O?\UPNb:K
{ RN:VsopL
NOTIFYICONDATA data; LX f r
data.cbSize=sizeof(NOTIFYICONDATA); N{+6 V`\
data.hWnd=GetSafeHwnd(); YX*NjXL
data.uID=98; *rKj%Me
Shell_NotifyIcon(NIM_DELETE,&data); V /i~IG`h/
ShowWindow(SW_SHOW); pHKcKqB*13
SetForegroundWindow(); (sM$=M<$
ShowWindow(SW_SHOWNORMAL); p+x}$&<|
bTray=FALSE; ~dc
o
} f2h`bO
;c tPe[5
void CCaptureDlg::OnChange() CE,0@%6F*
{ $-^
;Jl
RegisterHotkey(); <S[]VXy
} 7Eb |AR
!AR@GuQPE
BOOL CCaptureDlg::RegisterHotkey() T-MC|>pv
{ J|$UAOEDa
UpdateData(); .)(5F45Wg
UCHAR mask=0; ]?p 9)d=%<
UCHAR key=0; %"[`
if(m_bControl) A4K8DP
mask|=4; K&"ZZFd_
if(m_bAlt) TmviYP gb
mask|=2; ] 6Y6q])Z
if(m_bShift) DXF>#2E^+
mask|=1; =w !>/#U
key=Key_Table[m_Key.GetCurSel()]; i<\WRzVT
if(bRegistered){ t,w'w_C
DeleteHotkey(GetSafeHwnd(),cKey,cMask); JnE\z*NB
bRegistered=FALSE; 7&`Yl[G
} )L+>^cJI<
cMask=mask; 8*x/NaH
/\
cKey=key; U{C&R&z
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D4OJin^}
return bRegistered; zp'Vn7
} m!-R}PQC
[iXk v\
四、小结 R$m?aIN
V=d~}PJ>
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。