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:
!+.|T9P
?kew[oZ 一、实现方法
<GShm~XD2 j8@YoD5o 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:
L;xc,"\3 yg "u^*r& #pragma data_seg("shareddata")
B:tST( HHOOK hHook =NULL; //钩子句柄
IC9:&C[ UINT nHookCount =0; //挂接的程序数目
B7TA:K
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
2C %{A static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
f{lg{gA( static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
RC8{QgaI static int KeyCount =0;
2|o6~m<pE static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Um\Nd#=: #pragma data_seg()
GljxYH"]# kF~}htv.= 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。
0z."6r JW&/l 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:
)vsiX}3 K,' ]G&K BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Zb7KHKO{ cKey,UCHAR cMask)
(^eSm]< {
IR>^U BOOL bAdded=FALSE;
.F.4fk for(int index=0;index<MAX_KEY;index++){
l_u1 ~ K if(hCallWnd[index]==0){
|nXs'TO'O hCallWnd[index]=hWnd;
:gb7Py'C HotKey[index]=cKey;
@5zL4n@w HotKeyMask[index]=cMask;
Qg?^%O' bAdded=TRUE;
W)V"QrFK KeyCount++;
<!&nyuSz break;
_p7c<$; }
Og%qv
Bj 6 }
J']1^"_' return bAdded;
&oYX093di }
Gw3|"14 //删除热键
Te2XQU2,F BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Hw<t>z
k {
br<,? BOOL bRemoved=FALSE;
,a< !d for(int index=0;index<MAX_KEY;index++){
TH)gW if(hCallWnd[index]==hWnd){
G F,/<R # if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
G[6V=G hCallWnd[index]=NULL;
?`,UW; Br6 HotKey[index]=0;
iO3@2J HotKeyMask[index]=0;
Tm[IOuhM'? bRemoved=TRUE;
cy?u
* KeyCount--;
Revc
:m1o break;
M'HmVg4' }
hp,bfcM }
Eti;(>"@ }
G(|ki9^@"9 return bRemoved;
{DBgW}, }
.5|wy< E@R7b(:* HlPf DLL中的钩子函数如下:
N(]6pG= LwkZ (Tt
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<;+&`R {
N4}/n BOOL bProcessed=FALSE;
Z|uUE if(HC_ACTION==nCode)
\8=>l?P {
!u~( \Rb; if((lParam&0xc0000000)==0xc0000000){// 有键松开
Yc /rjEn7O switch(wParam)
#G|iEC0C {
<y \>[7Y case VK_MENU:
L$l'wz MaskBits&=~ALTBIT;
*xM4nUu<~ break;
yu<sd}@ case VK_CONTROL:
%z tCcgu* MaskBits&=~CTRLBIT;
JpD<2Mz_|V break;
lzfaW-nu case VK_SHIFT:
OYgD9T.8^ MaskBits&=~SHIFTBIT;
3F[z]B break;
1N1MD@C?P default: //judge the key and send message
4{X5ZS?CkI break;
5)2lZ(5.A# }
%[-D&flKC for(int index=0;index<MAX_KEY;index++){
Sh*LD
QL<? if(hCallWnd[index]==NULL)
/{d7%Et6 continue;
fZ]Y if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V3xC"maA@ {
5pI2G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
i(2s"Uww, bProcessed=TRUE;
tqAh&TW3+ }
X&TTw/J!^ }
UOZ"#cQ }
g,7`emOX else if((lParam&0xc000ffff)==1){ //有键按下
?^Q!=W<7 switch(wParam)
|jk"; h {
bf-.SX~ case VK_MENU:
&o=
#P2Qd MaskBits|=ALTBIT;
5<GC break;
- ~T LI&[ case VK_CONTROL:
7d]}BLpjWz MaskBits|=CTRLBIT;
:xm,Ok break;
ga?.7F case VK_SHIFT:
>jME
== U0 MaskBits|=SHIFTBIT;
ux& WN , break;
vp1IYW default: //judge the key and send message
s6lo11 break;
>pbO\=j]X }
LS+ _y<v= for(int index=0;index<MAX_KEY;index++){
mMS%O]m,| if(hCallWnd[index]==NULL)
kTT!gZP$ continue;
/G9wW+1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7;)
T;X {
4)!aYvaER SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
:,Q\!s! bProcessed=TRUE;
ly7\H3 }
"H" 4(3 }
;x$,x- }
Jv %,v? if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
\ty{KAc& for(int index=0;index<MAX_KEY;index++){
b<P9@h~: if(hCallWnd[index]==NULL)
Q.>@w<[!L continue;
<[@AMd S if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
#;)Oi9{9; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
(y[+s?;WyB //lParam的意义可看MSDN中WM_KEYDOWN部分
4`yCvPu }
7](,/MeGG }
:$~)i?ge<5 }
SS[jk return CallNextHookEx( hHook, nCode, wParam, lParam );
zp:kdN7!^ }
ARGtWW~: C}<j8a? 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:
3vfm$sx@ uPr'by BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
2w>WS# BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
PTWP7A[ [fiB!G]? 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:
;!q _+P }A\s`Hm LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
vxhs1vh {
7xTgG!>v if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
o|YY,G=C {
<^c?M[j //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
y[:\kI SaveBmp();
:hr% 6K7 return FALSE;
dlmF?N|EC }
y{
%2Q) …… //其它处理及默认处理
u9ObFm$7 }
0}C> e`<' [nZf4KN
S<#>g
s4 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。
{4J:t_<nKO zP$0B!9 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
IL;JdIa kU{+@MA; 二、编程步骤
@E;'Ffo Tw*:Vw 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
I(tMw6C$: OJ^kESrm8 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
K4~z@.
G6* d7waBsf 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;
&*}`uJt ?~X*\ 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;
W/DSj : y.P Wh<dI 5、 添加代码,编译运行程序。
}K':tX? Q#w mS&$f 三、程序代码
&YC Z
L *(wkgn ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
> Dy<@e #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
ix4O-o{ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<qJI]P #if _MSC_VER > 1000
FcVQ_6 #pragma once
P'%#B&LZo #endif // _MSC_VER > 1000
E[q:65xl #ifndef __AFXWIN_H__
E-gI'qG\( #error include 'stdafx.h' before including this file for PCH
{w:*t)@j #endif
U4)x "s[CP #include "resource.h" // main symbols
:0@R(ct;> class CHookApp : public CWinApp
Sk7l&B {
nb-]fa public:
%3b;`Oa CHookApp();
#gn{X!;-; // Overrides
{9?++G"\ // ClassWizard generated virtual function overrides
:5|'C //{{AFX_VIRTUAL(CHookApp)
R9XISsM^ public:
eajctkzj virtual BOOL InitInstance();
-': ;0 virtual int ExitInstance();
ykK21P,v //}}AFX_VIRTUAL
H4RqOI //{{AFX_MSG(CHookApp)
qLC_p) // NOTE - the ClassWizard will add and remove member functions here.
&!i'Q;q // DO NOT EDIT what you see in these blocks of generated code !
[bM$n
m //}}AFX_MSG
cxX/ b, DECLARE_MESSAGE_MAP()
F{*{f =E!B };
"#}Uh LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Q1f)uwh BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
(bhMo^3/* BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
%G6Q+LMwm BOOL InitHotkey();
*rKj%Me BOOL UnInit();
<"/b 5kc #endif
QguRU|y oKyl2jg+, //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
(h{"/sR #include "stdafx.h"
CCoT #include "hook.h"
HGycF|]2 #include <windowsx.h>
?{=&R o #ifdef _DEBUG
rtM29~c>@ #define new DEBUG_NEW
m\*;Fx #undef THIS_FILE
f2h`bO static char THIS_FILE[] = __FILE__;
Ln-UN$2~F #endif
M2Q*#U>6r #define MAX_KEY 100
L#h uTKX} #define CTRLBIT 0x04
v7-z<'?s~ #define ALTBIT 0x02
$-^
;Jl #define SHIFTBIT 0x01
iA.:{^_)09 #pragma data_seg("shareddata")
YQ? "~[mL HHOOK hHook =NULL;
B`{7-Asc1 UINT nHookCount =0;
uwI$t[ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
zX]4DLl, static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
!2=m
|, static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
r0^ *|+
static int KeyCount =0;
>o/+z18x static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
A4K8DP #pragma data_seg()
y@XE! L HINSTANCE hins;
o?,c#g void VerifyWindow();
k2-+3zx BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
P~}Yj@2 //{{AFX_MSG_MAP(CHookApp)
ZuLW%z. // NOTE - the ClassWizard will add and remove mapping macros here.
ol3].0Vc] // DO NOT EDIT what you see in these blocks of generated code!
N1D{ % //}}AFX_MSG_MAP
!)r1zSY"g END_MESSAGE_MAP()
pNFVa<D DhVO}g)2# CHookApp::CHookApp()
F ?N+ __o {
_a]0<Vm C0 // TODO: add construction code here,
evSr?ys // Place all significant initialization in InitInstance
6uS;H]nd< }
,vDSY N6 /Fj*sS8 CHookApp theApp;
8*x/NaH
/\ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
\Gl>$5np {
O[Yc-4 BOOL bProcessed=FALSE;
F_I.=zQr if(HC_ACTION==nCode)
!8Y$} {
V$Zl]f$S if((lParam&0xc0000000)==0xc0000000){// Key up
Kcu*Z switch(wParam)
:DG7Z {
PenkqDc} case VK_MENU:
E!EENg MaskBits&=~ALTBIT;
1[]
9EJ break;
}'`iJb\ case VK_CONTROL:
^\ku}X_[? MaskBits&=~CTRLBIT;
Q30TR break;
%\f<N1~* case VK_SHIFT:
`RlMfd MaskBits&=~SHIFTBIT;
@f!r"P] break;
]mR!-Fqj default: //judge the key and send message
mI>=S break;
'w"hG$". }
Xk>YiV",? for(int index=0;index<MAX_KEY;index++){
BAIR! if(hCallWnd[index]==NULL)
)z\ 73|w continue;
1j_
6Sw( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w~AW(
VX {
mufXM( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
u>\u}c bProcessed=TRUE;
'z9}I
# }
dKpUw9C#/ }
xLShMv} }
a{
p1Yy-] else if((lParam&0xc000ffff)==1){ //Key down
X..<U}e switch(wParam)
{>Yna"p {
DCP
B9:u case VK_MENU:
9dCf@5] MaskBits|=ALTBIT;
'H8b+ break;
>F5E^DY case VK_CONTROL:
AfT;IG%Gt MaskBits|=CTRLBIT;
) :VF^" break;
Y52TC@' case VK_SHIFT:
5~FXy{ZIH MaskBits|=SHIFTBIT;
ZH)thd9^b break;
Ba}<X;B } default: //judge the key and send message
gP2<L5&Z, break;
d3;Sy`. }
-|2k$W for(int index=0;index<MAX_KEY;index++)
s 9n_s=w {
F\2<q$Zn+ if(hCallWnd[index]==NULL)
jZgCDA8Mr! continue;
h f{RI 4Jc if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
X?aj0# Q {
&HBC9Bx/( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9GgXX9K bProcessed=TRUE;
QB5,Vfoux }
@bIZ0tr4 }
bLSUF`-z }
g[L}puN if(!bProcessed){
P$v9 for(int index=0;index<MAX_KEY;index++){
y=&^=Zh[ if(hCallWnd[index]==NULL)
LI9
Uc\ continue;
@(CJT-Ak if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
c[+uwO~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
|>/m{L[ }
:Aa5,{v_ }
O`f[9^fN }
,lFhLj7 return CallNextHookEx( hHook, nCode, wParam, lParam );
UO(?EELm }
SnVb D< ~o27~R ] BOOL InitHotkey()
VXO.S)v2J {
xM:9XhH1 if(hHook!=NULL){
O ]!/fZ;( nHookCount++;
:yFmCLZaQ return TRUE;
l.uW>AoLh }
m't8\fo^w else
rm%MQmF hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
534DAhpD=. if(hHook!=NULL)
ZC97Z sE nHookCount++;
cD'|zH] return (hHook!=NULL);
[5-3PuT&9 }
$T7(AohR BOOL UnInit()
H`OJN. {
(9KiIRN if(nHookCount>1){
,56objaE nHookCount--;
`Y,<[ Lnr return TRUE;
6&KcO:}- }
^WUG\@B BOOL unhooked = UnhookWindowsHookEx(hHook);
e"cvo(}g if(unhooked==TRUE){
Yan,Bt{YJ nHookCount=0;
-r%k)4_ hHook=NULL;
8Z>=sUMQ }
MI,kKi return unhooked;
(/jZ&4T }
]6].l$%z# _i2guhRs*Q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.zo>,*:t {
_ q^JjR BOOL bAdded=FALSE;
}8dS[-. for(int index=0;index<MAX_KEY;index++){
P"a9+ti+' if(hCallWnd[index]==0){
j>)yV@g/ hCallWnd[index]=hWnd;
r2=4Wx4( HotKey[index]=cKey;
T:g=P@ HotKeyMask[index]=cMask;
+jyWqld.K1 bAdded=TRUE;
Lnc>O'<5P9 KeyCount++;
[! YSW' break;
SquuK1P= }
-d*je{c| }
<xh";seL return bAdded;
78kT}kgW }
>dfk2.6e #;hYJ Y BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
V5rW_X:]8 {
[&+5E1%L BOOL bRemoved=FALSE;
S8Yti for(int index=0;index<MAX_KEY;index++){
M,g$ if(hCallWnd[index]==hWnd){
Y))x'<T'Q if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
?@H/;hB[| hCallWnd[index]=NULL;
y\mK?eR HotKey[index]=0;
z+]YB5zK% HotKeyMask[index]=0;
ok/{ w bRemoved=TRUE;
#T08H,W/ KeyCount--;
QBLha']'% break;
jfjT::f>l }
c=<5DC&p }
|g!3f }
PDhoCAh
! return bRemoved;
)26_7.| }
kz^?!l)X0 6XI$ o,{ void VerifyWindow()
B8NMo5a {
:y^%I xs{1 for(int i=0;i<MAX_KEY;i++){
?dY|,_O if(hCallWnd
!=NULL){ -GT&46hX
if(!IsWindow(hCallWnd)){ sW0<f&3
hCallWnd=NULL; x%%OgO+>
HotKey=0; ^gY3))2_
HotKeyMask=0; u%AyW
KeyCount--; b2XUZ5
} ,2]a<0m
} Qn`Fq,uvL
} en-HX3'
} gJ?Vk<hp
M"E7=J
BOOL CHookApp::InitInstance() oNp(GQ@0
{ Z?)=4|
AFX_MANAGE_STATE(AfxGetStaticModuleState()); >=d%t6%(
hins=AfxGetInstanceHandle(); kGW4kuh)/q
InitHotkey(); T*qSk!
return CWinApp::InitInstance(); aS&,$sR
} c. 06Sw*
a$]i8AeG
int CHookApp::ExitInstance() x"{WLZ
{ u9D#5NvGs
VerifyWindow(); >_SqM! ^v
UnInit(); TgvBy
return CWinApp::ExitInstance(); `-[|@QNFz
} YxWA]
yL
@]@6(To
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file A3Oe=rB
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Gk]6WLi
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?(>fB2^
#if _MSC_VER > 1000 eY8rm
#pragma once d< b ,].
#endif // _MSC_VER > 1000 */y (~O6
.a7!*I#g
class CCaptureDlg : public CDialog P:fcbfH+
{ E@7);i5K
// Construction x#}{z1op9
public: g @qrVQv
BOOL bTray; h4tAaPcS+
BOOL bRegistered; LuvRxmQ`
BOOL RegisterHotkey(); ';3#t(J;
UCHAR cKey; !b8.XGo
UCHAR cMask; Q[MWzsx
void DeleteIcon(); h9I vuv'
void AddIcon(); v6KRE3:V
UINT nCount; U flS`
void SaveBmp(); Wph@LRB]
CCaptureDlg(CWnd* pParent = NULL); // standard constructor v&Oc,W
// Dialog Data 2dnyIgi
//{{AFX_DATA(CCaptureDlg) w=QW8q?
enum { IDD = IDD_CAPTURE_DIALOG }; F-PQ`@ZNW
CComboBox m_Key; -;j
'=?
BOOL m_bControl; 69$gPY'3
BOOL m_bAlt; =p>IP"HJ
BOOL m_bShift; tWaM+W
CString m_Path; Lb} $)AcC
CString m_Number; GDY=^r
//}}AFX_DATA
$M|
// ClassWizard generated virtual function overrides /<Yz;\:Jy
//{{AFX_VIRTUAL(CCaptureDlg) NM4b]>
public: `]j:''K
virtual BOOL PreTranslateMessage(MSG* pMsg); bz|-x"qk
protected: dT'd C
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?XB[awTD~
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); R_2T"
//}}AFX_VIRTUAL J4#rOS
// Implementation nWFU8u%
protected: 6D/K=-
HICON m_hIcon; Q|(G -
// Generated message map functions m#`1.5%
//{{AFX_MSG(CCaptureDlg) XB;C~:
virtual BOOL OnInitDialog(); $u%7]]Y^\
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^!rAT1(/_
afx_msg void OnPaint(); #}S<O_
afx_msg HCURSOR OnQueryDragIcon(); R?iC"s!
virtual void OnCancel(); T.pc3+B8N
afx_msg void OnAbout(); THY=8&x)
afx_msg void OnBrowse(); Y>Fh<"A|$
afx_msg void OnChange(); 2k M;7:
//}}AFX_MSG 4x|\xg(
l
DECLARE_MESSAGE_MAP() 4KB>O)YNg'
}; W[t0hbVw
#endif 1h#e-Oyff
L)X[$:
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7~!F3WT{
#include "stdafx.h" nd,2EX<bE
#include "Capture.h" <5o
oML]nP
#include "CaptureDlg.h" F}c}I8Ao
#include <windowsx.h> GBYwS{4
#pragma comment(lib,"hook.lib") ):7mK03J
#ifdef _DEBUG :N64FR#
#define new DEBUG_NEW xl ,(=L]
#undef THIS_FILE Y+ !z]S/x
static char THIS_FILE[] = __FILE__; i)=
\-C
#endif ndHUQ$/(
#define IDM_SHELL WM_USER+1 `l0"4[?
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U?=-V8#M|
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +d=w%r)
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PnZY%+[I
class CAboutDlg : public CDialog #AF.1;(k
{ `oOVR6{K9
public: s y>}2orj~
CAboutDlg(); +;bP.[Z
// Dialog Data B3&C=*y
//{{AFX_DATA(CAboutDlg) )4^Sz &\
enum { IDD = IDD_ABOUTBOX }; S`pB EM
//}}AFX_DATA C_;A~iI7
// ClassWizard generated virtual function overrides dfT
//{{AFX_VIRTUAL(CAboutDlg) /a}`
y
protected: K)W:@,*
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZKt`>KZ
//}}AFX_VIRTUAL !OV+=Rwdx
// Implementation e#!p6+#"
protected: 2?@Ozr2Uh
//{{AFX_MSG(CAboutDlg) Xx1e SX
//}}AFX_MSG t&Jrchk
DECLARE_MESSAGE_MAP() 7gE/g`"#
}; c7A]\1 ~
9QHV%%
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y'C
{ 5#~E[dr
//{{AFX_DATA_INIT(CAboutDlg) <-"[9 w
//}}AFX_DATA_INIT w+gPU1|(r
} KJ
cuZ."wX
FD/=uIXH2
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @ \*Zq
{ I lZ$Jd
CDialog::DoDataExchange(pDX); YI?tmqzt
//{{AFX_DATA_MAP(CAboutDlg) 6#kmV
//}}AFX_DATA_MAP "'~&D/7
} 5DL(#9F8b9
.* &F
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &M7AM"9
//{{AFX_MSG_MAP(CAboutDlg) v)JS4KS
// No message handlers !q 9PO
//}}AFX_MSG_MAP RV),E:?
END_MESSAGE_MAP() byPqPSY
UZ!It>
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |#zj~>7?
: CDialog(CCaptureDlg::IDD, pParent) ^1bM=9]F0
{ |Q$Dj!!1P
//{{AFX_DATA_INIT(CCaptureDlg) bzh:
m_bControl = FALSE; O+t'E9Fa
m_bAlt = FALSE; =g$%jM>35
m_bShift = FALSE; cToT_Mk
m_Path = _T("c:\\"); %[on.Q'1]2
m_Number = _T("0 picture captured."); '#>(JN5\
nCount=0; ZQAiuea
bRegistered=FALSE; yT[)V[}
bTray=FALSE; \7G.anY
//}}AFX_DATA_INIT 5%w08
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \S>GtlQbn
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d$y?py
} {T 3~js
7GRPPh<4
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) a}[rk*QmZ
{ n(
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CDialog::DoDataExchange(pDX); t@jke
//{{AFX_DATA_MAP(CCaptureDlg) )H+ p6<
DDX_Control(pDX, IDC_KEY, m_Key); L=&}s[5
DDX_Check(pDX, IDC_CONTROL, m_bControl); ; jrmr`l=
DDX_Check(pDX, IDC_ALT, m_bAlt); akzKX}
DDX_Check(pDX, IDC_SHIFT, m_bShift); c]NZGn*
DDX_Text(pDX, IDC_PATH, m_Path); 1cD
DDX_Text(pDX, IDC_NUMBER, m_Number); ~)*uJ wW/a
//}}AFX_DATA_MAP ] -%B4lT
} =lL)g"xX
Tr,
zV
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3[<D"0#},
//{{AFX_MSG_MAP(CCaptureDlg) 0F 6~S
ON_WM_SYSCOMMAND() r%%@~ \z
ON_WM_PAINT() rN'}IS@5
ON_WM_QUERYDRAGICON() |OIU)53A-
ON_BN_CLICKED(ID_ABOUT, OnAbout) Se>v|6
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 95Q^7oI
ON_BN_CLICKED(ID_CHANGE, OnChange) ,3Nna:~f
//}}AFX_MSG_MAP ?;ZnD(4?
END_MESSAGE_MAP() $`<-;kI
V6_~"pRR=
BOOL CCaptureDlg::OnInitDialog() L&&AK`Ur3l
{ <GSp%r
CDialog::OnInitDialog(); :VE0eJ]J6
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); );{76
ASSERT(IDM_ABOUTBOX < 0xF000);
%$=2tfR
CMenu* pSysMenu = GetSystemMenu(FALSE); fni7HBV?
if (pSysMenu != NULL) szp.\CMz
{ sU/vXweky"
CString strAboutMenu; NMESGNa)z
strAboutMenu.LoadString(IDS_ABOUTBOX); 9]:F!d/
if (!strAboutMenu.IsEmpty()) ptlag&Z
{ )1f.=QZN^;
pSysMenu->AppendMenu(MF_SEPARATOR); T-Yb|@4
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); G)&!f)6
} _po5j;"_O
} rLA^ &P:
SetIcon(m_hIcon, TRUE); // Set big icon L$ZsNs+
SetIcon(m_hIcon, FALSE); // Set small icon [ ^gb6W9Y
m_Key.SetCurSel(0); o90[,
RegisterHotkey(); N'Vj& DWC
CMenu* pMenu=GetSystemMenu(FALSE); 1z_1Hl
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~Xc1y!"9*
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yUs/lI, Q
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #I#_gjJkx
return TRUE; // return TRUE unless you set the focus to a control +1c[!;'
} S$/SFB$)~W
60l!3o"p!
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) y0'WB`hNQ
{ I(<Trn
if ((nID & 0xFFF0) == IDM_ABOUTBOX) umt(e:3f5
{ -/_hO$|W
CAboutDlg dlgAbout; rdH^"(
dlgAbout.DoModal(); ?(M]'ia{
} G> sqfYkK
else mteQRgC
{ _)6r@fZ.p
CDialog::OnSysCommand(nID, lParam); r(<91~Ww
} .Dy2O*`
} o1H6E1$=
B/B`=%~5_^
void CCaptureDlg::OnPaint() .e\PCf9v
{ lDVgW}o@
if (IsIconic()) ^G
"Qp8 "
{ G6qFAepwi
CPaintDC dc(this); // device context for painting }S{VR(i`J
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lYU?j|n
// Center icon in client rectangle #
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int cxIcon = GetSystemMetrics(SM_CXICON); pL: r\Y:R
int cyIcon = GetSystemMetrics(SM_CYICON);
<3x:nH @
CRect rect; 1";s#Jq
GetClientRect(&rect); <kazV<"
int x = (rect.Width() - cxIcon + 1) / 2; :wfN+g=
int y = (rect.Height() - cyIcon + 1) / 2; uCgJF@
// Draw the icon be [E^%
dc.DrawIcon(x, y, m_hIcon); i]& >+R<6
} L;=LAQ6[
else 4^!%>V"d/
{ |#Q0UM|'Q
CDialog::OnPaint(); ~|ha91
} wdIJ?\/763
} =[0|qGzg
q-S#[I+g
HCURSOR CCaptureDlg::OnQueryDragIcon() tO3#kV\,
{ (W#^-*$R
return (HCURSOR) m_hIcon; CDT;AdRw7
} )U{\c2b
$p*.[)
void CCaptureDlg::OnCancel() [}5mi?v
{ gCbS$Pw
if(bTray) Q1(4l?X@
DeleteIcon(); WsT
CDialog::OnCancel(); VdGpreRPC
} -4obX
2` Ihrz6
void CCaptureDlg::OnAbout() k|$?b7)"@
{ kpMo7n
CAboutDlg dlg; H% FP!03
dlg.DoModal(); 9{Igw"9ck
} 3il$V78|
;,xM*
void CCaptureDlg::OnBrowse() s\Ln
{ TV/ EC#48
CString str; BC#O.93`
BROWSEINFO bi; (~fv;}}v
char name[MAX_PATH]; /)sP<WPQ6
ZeroMemory(&bi,sizeof(BROWSEINFO)); F6_en z
bi.hwndOwner=GetSafeHwnd(); '_ys4hz}
bi.pszDisplayName=name; {9{PU&?(
bi.lpszTitle="Select folder"; ei~f1$zc#h
bi.ulFlags=BIF_RETURNONLYFSDIRS; YR[I,j
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9xeg,#1
if(idl==NULL) BadnL<cj]
return; BN6cu9a
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z_mQpt|y
str.ReleaseBuffer(); 2"WP>>b80
m_Path=str; ER;\Aes*?
if(str.GetAt(str.GetLength()-1)!='\\') Q'YakEv >=
m_Path+="\\"; BE!l{
UpdateData(FALSE); J|([(
} TY?O$d2b3
m=a^t
void CCaptureDlg::SaveBmp() -op)X>
{ fnIF<Zt
CDC dc; c GyBml1
dc.CreateDC("DISPLAY",NULL,NULL,NULL); tRNMiU
CBitmap bm; U[z2{\
int Width=GetSystemMetrics(SM_CXSCREEN); f<y3/jl4
int Height=GetSystemMetrics(SM_CYSCREEN); a3,A_M}M'
bm.CreateCompatibleBitmap(&dc,Width,Height); 6#ktw)e
CDC tdc; MjK<n[.
tdc.CreateCompatibleDC(&dc); 4~2 9,
CBitmap*pOld=tdc.SelectObject(&bm); 7Rn
4gT
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6=Sz5MC
tdc.SelectObject(pOld); &AVX03P
BITMAP btm; )5u#'5I>
bm.GetBitmap(&btm); Iu^I?c[
DWORD size=btm.bmWidthBytes*btm.bmHeight; |W}D_2
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0 c]]
BITMAPINFOHEADER bih; `#l1
bih.biBitCount=btm.bmBitsPixel; +}eK8>2
bih.biClrImportant=0; c= aZ[
bih.biClrUsed=0; *;Za))
bih.biCompression=0; uUe#+[bD
bih.biHeight=btm.bmHeight; Ao@WTs9
bih.biPlanes=1; <4CqG4}Y
bih.biSize=sizeof(BITMAPINFOHEADER); M|R\[
Zf
bih.biSizeImage=size; 3,J{!
bih.biWidth=btm.bmWidth; V;gC[7H
bih.biXPelsPerMeter=0; L1&` 3a?pL
bih.biYPelsPerMeter=0; (0Jr<16si$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Pfd%[C/vdm
static int filecount=0; P G
zwS
CString name; I:1Pz|$`
name.Format("pict%04d.bmp",filecount++); xpI8QV$#
name=m_Path+name; aO2zD<d
BITMAPFILEHEADER bfh; )k]{FM
bfh.bfReserved1=bfh.bfReserved2=0; ]ZH6
.@|
bfh.bfType=((WORD)('M'<< 8)|'B'); s+ ^1\
bfh.bfSize=54+size; /JIVp_-p
bfh.bfOffBits=54; Nw%^Gs<~
CFile bf; tg<bVA)E'J
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l-5O5|C
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ($gmN 4
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AdbTI#eY
bf.WriteHuge(lpData,size); sXYXBX[
bf.Close(); 5C9
.h:c4y
nCount++; {c7@`AV]
} X^i3(N
GlobalFreePtr(lpData); vzF6e eaD
if(nCount==1)
ONUa7
m_Number.Format("%d picture captured.",nCount); j"+6aD/lv
else :*-O;Yw?S@
m_Number.Format("%d pictures captured.",nCount); !uA'0U?ky
UpdateData(FALSE); c?6(mU\x
} +~7[T/v+n
[8vqw(2Tm(
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =FMrVE
{ Z7 ++c<|p
if(pMsg -> message == WM_KEYDOWN) b,47
EJ}
{ 3TN'1D ei
if(pMsg -> wParam == VK_ESCAPE) Jg$ NYs.xZ
return TRUE; Q+'fTmT[,
if(pMsg -> wParam == VK_RETURN) nYO$ |/e
return TRUE; -6^Ee?"
} ony;U#^T
return CDialog::PreTranslateMessage(pMsg); pP%+@;
} g_eR&kuh
lq?N>~PG
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xXJzE|)1h!
{ M>i *e
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ u3DFgl3-7
SaveBmp(); g@]1H41
return FALSE; d
<zD@ z
} BWr!K5w>i
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B)dd6R>8
CMenu pop; mS.!lkV
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ds@K%f(.?w
CMenu*pMenu=pop.GetSubMenu(0); >b~Q%{1
pMenu->SetDefaultItem(ID_EXITICON); !Nbi&^k B
CPoint pt; `.wgRUhFH;
GetCursorPos(&pt); w1
A-_
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }IQ! [T5
if(id==ID_EXITICON) [geT u
DeleteIcon(); |7.X)h`
else if(id==ID_EXIT) Z*(OcQ-
OnCancel(); bNoZ{ 7
return FALSE; gL1r"&^L
} QwuSo{G
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Ko
"JH=<
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \?^ EFA+;
AddIcon(); S)"vyGv
return res; k1LbWR1%wB
} hJX;/~L
% QaWg2Y=
void CCaptureDlg::AddIcon() 9gZS)MZ
{ !_?HSDAj"n
NOTIFYICONDATA data; Ey_mK\'
data.cbSize=sizeof(NOTIFYICONDATA); WK.,q>#
CString tip; nVGOhYn
tip.LoadString(IDS_ICONTIP); !H @nAz
data.hIcon=GetIcon(0); UaHN*@
data.hWnd=GetSafeHwnd(); W7 +Q&4Y
strcpy(data.szTip,tip); ]ij:>O@{$
data.uCallbackMessage=IDM_SHELL; 5yp
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E.yc"|n7l2
data.uID=98; j92+kq>Xd
Shell_NotifyIcon(NIM_ADD,&data); 3 >^B%qg6
ShowWindow(SW_HIDE); {s?hXB
bTray=TRUE; HBw0N?
} }~#qDrK
s3~6[T?8
void CCaptureDlg::DeleteIcon() / $'M
{ ])WIw'L!
NOTIFYICONDATA data; RC!T1o~L
data.cbSize=sizeof(NOTIFYICONDATA); W#^p%?8pR
data.hWnd=GetSafeHwnd(); ?MiMwVR
data.uID=98; u7-0?
Shell_NotifyIcon(NIM_DELETE,&data); x
o72JJ
ShowWindow(SW_SHOW); 3>z+3!I z
SetForegroundWindow(); uW,rmd
ShowWindow(SW_SHOWNORMAL); @!(V0 -
bTray=FALSE; J^Wqa$<;"
} OW8TiM
mK
[VOw:|Tt
void CCaptureDlg::OnChange() ;bq
EfV0`2
{ hiaTJE|J?
RegisterHotkey(); =I+5sCF{g
} &<C&(g{Z
11JO [
BOOL CCaptureDlg::RegisterHotkey() y{nX 6
{ 9(BB>o54r
UpdateData(); o2LUB)=R'
UCHAR mask=0; <Q.-WV]Z
UCHAR key=0; `=8G?3
if(m_bControl) U9R pHh`
mask|=4; jLBwPI_g
if(m_bAlt) o5NrDDH
mask|=2; E8We2T[^M
if(m_bShift) |U="B4
mask|=1; td2bL4
key=Key_Table[m_Key.GetCurSel()]; q -^Z=,<
if(bRegistered){ }5"19
Go?
DeleteHotkey(GetSafeHwnd(),cKey,cMask); @'S !G"\
bRegistered=FALSE; }$s._)a
} r}t%DH
cMask=mask; uC1v^!D
cKey=key; et}s yPH
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); w"j [c#vM
return bRegistered; dJZ
9mP!d
} glWa? #1
v=+> ids
四、小结 N)$yBzN
[m]O^Hp{{
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。