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!.(7qdd
2mRso.Ah 一、实现方法
B(~D*H2T[ 9I9)5`d|Jn 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:
.|K5b]na :}lE@Y,R #pragma data_seg("shareddata")
U1Oq"Ij~ HHOOK hHook =NULL; //钩子句柄
|kn}iA@72p UINT nHookCount =0; //挂接的程序数目
Z(s}
#- static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
J0`?g6aY static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
Oe?nX> static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Cfi5r|S static int KeyCount =0;
u[% #/ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
DE[y&]/C{ #pragma data_seg()
pP .
*UTk. :G5 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。
xg8<b
Z7 @#0;g{ 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:
mEA w^ uQDu<@5^[ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
NJ~'`{3v cKey,UCHAR cMask)
0o#lB^e;l {
5v]xk?Eb BOOL bAdded=FALSE;
x?k6ek for(int index=0;index<MAX_KEY;index++){
q+ .=f.+Z if(hCallWnd[index]==0){
W{%M+a[#l hCallWnd[index]=hWnd;
V1+IqOXAIp HotKey[index]=cKey;
9wYbY* j HotKeyMask[index]=cMask;
g$+3IVq& bAdded=TRUE;
KP
i@wl3 KeyCount++;
lm+wjhkN break;
.p&M@h
w }
/w|YNDA]j }
yfU1;MI return bAdded;
|1neCP@ng }
Y=5hm //删除热键
rkD(KG9E BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\"Np'$4eu {
P?I"y,_ p BOOL bRemoved=FALSE;
XjV7Ew^7 for(int index=0;index<MAX_KEY;index++){
:r\<DVj if(hCallWnd[index]==hWnd){
Tb}b*d3 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
[=iq4F'7 hCallWnd[index]=NULL;
f"[C3o2P HotKey[index]=0;
v;OA hF r| HotKeyMask[index]=0;
I;No++N0 bRemoved=TRUE;
3[c54S+(U KeyCount--;
^Tl|v'
break;
%T&kK2d; }
MT3UJ6 ~P }
rC'97`!K }
qU}[(9~Ru return bRemoved;
g,.iM8 }
wBr0s*1I Z$q}y
79^ Ay{4R DLL中的钩子函数如下:
]WS 7l@ #PiW\Tq LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
u+ -}| {
2nf{2edC BOOL bProcessed=FALSE;
Y,+$vj:y8 if(HC_ACTION==nCode)
CzwnmSv{. {
H7uW|'XWz if((lParam&0xc0000000)==0xc0000000){// 有键松开
uG/Zpi switch(wParam)
~; MRQE {
lwV#j}G case VK_MENU:
7{p,<Uz<"U MaskBits&=~ALTBIT;
ec{pWzAe break;
5y.kOe4vH case VK_CONTROL:
z 6p.{M MaskBits&=~CTRLBIT;
Eg
;r]?|6 break;
VlKWWQj case VK_SHIFT:
O)&V}hU* MaskBits&=~SHIFTBIT;
J"|o g|Tz break;
m~2PpO default: //judge the key and send message
-ohqw+D break;
<FP&1Eg!| }
-&+[/ for(int index=0;index<MAX_KEY;index++){
VLR W,lR9O if(hCallWnd[index]==NULL)
.8k9yk continue;
O5E \#*<K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%kF6y_h` {
D&.+Dx^G SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
d}Q;CF3m: bProcessed=TRUE;
i7iL[+f]Q }
t)5bHVx }
gx3arVa }
<_h else if((lParam&0xc000ffff)==1){ //有键按下
zh7NXTzyf switch(wParam)
Ty7xjIs {
v&|o5om case VK_MENU:
Mu TlN MaskBits|=ALTBIT;
E<0Y;tR break;
"Ln)v case VK_CONTROL:
%?K'egkp MaskBits|=CTRLBIT;
WxFVbtw break;
HG{OkDx]fl case VK_SHIFT:
mkgDg y MaskBits|=SHIFTBIT;
6?r}bs6Msx break;
G/b
$cO} default: //judge the key and send message
Uh{|@D break;
yH irm|o }
a8NL for(int index=0;index<MAX_KEY;index++){
WSUU_^. if(hCallWnd[index]==NULL)
n%A)#AGGc continue;
u`g|u:(r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
{ZB7,\ {
86oa>#opU SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
?m0|>[j bProcessed=TRUE;
Nvw'[?m }
!ouJ3Jn }
sZ_+6+ : }
Ubv<3syR' if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
|pA3ZWm for(int index=0;index<MAX_KEY;index++){
z]K:Amp;Z if(hCallWnd[index]==NULL)
!2=<MO continue;
p4[cPt ~C if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Kx7s
d i SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]%pr1Ey //lParam的意义可看MSDN中WM_KEYDOWN部分
RAPR-I;{ }
x= X"4Mj0) }
(/JiOg^cw }
uS;N&6;: return CallNextHookEx( hHook, nCode, wParam, lParam );
^Yul|0*J }
zr2oU '+ yCpU173V 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
wX[g\,?}' IBZ_xU\2 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,:;ZzHzR0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
?`8jn$W^ f<?v.5($ 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:
MDAJ
p>o ;Lr]w8d LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
B^nE^"b {
*d b,N'rK if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
fgdqp8~ {
h8'`g 0 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
bL-+ SaveBmp();
dD ?ZF6 return FALSE;
b*(74 >XY }
E+)3n[G …… //其它处理及默认处理
n
'gU }
ir!/{IQx p?PK8GL vnc-W3N 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。
b1\.hi F!ZE4S_ 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。
^ZuwUuuf ebfT%_N 二、编程步骤
05hjC LD/NMb 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";
lub_2Cb|j Q #IlUo 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
x4v@o?zW fRh}n ^X 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;
ZD ~ra7 {9B"'65o 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;
:8=7)cW gjFpM.D-. 5、 添加代码,编译运行程序。
0i[v,eS y!eT>4Oyg 三、程序代码
/0 CS2mLC *!NxtB!LC ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
TMJq-u51 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
W-D{cU #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
gv\WI4"n #if _MSC_VER > 1000
_xY
dnTEl #pragma once
Vq$8!#~w #endif // _MSC_VER > 1000
mSeCXCrZlI #ifndef __AFXWIN_H__
l]R=I2t #error include 'stdafx.h' before including this file for PCH
+adwEYRrr #endif
FNlS)Bs #include "resource.h" // main symbols
4M*Z1 class CHookApp : public CWinApp
?*LVn~y {
~
kwS` public:
}iIZA>eF CHookApp();
C2
4"H|D // Overrides
'Y2ImSWj // ClassWizard generated virtual function overrides
)[wB:kG //{{AFX_VIRTUAL(CHookApp)
z|bAZKSRYx public:
/:B2-4>Q! virtual BOOL InitInstance();
/Vdu|k= virtual int ExitInstance();
k~Z;S QyN //}}AFX_VIRTUAL
\?tE,\Ln //{{AFX_MSG(CHookApp)
cY]BtJ# // NOTE - the ClassWizard will add and remove member functions here.
u4x>gRz) // DO NOT EDIT what you see in these blocks of generated code !
Q%r KKOX8 //}}AFX_MSG
Y]VLouzl DECLARE_MESSAGE_MAP()
{^":^N) };
{'cm;V+ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
fj|X`,TiZ; BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
tJ$gH; BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2Y>#FEW/ BOOL InitHotkey();
4ibOVBG:*, BOOL UnInit();
#?"^: ,Y #endif
OMfw# []:&WA9N //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
(h"-#q8$ #include "stdafx.h"
PCx: #include "hook.h"
HjCe/J ; #include <windowsx.h>
eHb@qKnf #ifdef _DEBUG
twMDEw#VL #define new DEBUG_NEW
u+
b `aB #undef THIS_FILE
Z\r?>2 static char THIS_FILE[] = __FILE__;
O\F$~YQ #endif
g o9tvK #define MAX_KEY 100
Yz)+UF, #define CTRLBIT 0x04
4OeH}@ a #define ALTBIT 0x02
v`hn9O #define SHIFTBIT 0x01
NK\0X5##. #pragma data_seg("shareddata")
XM f>B| HHOOK hHook =NULL;
Gv&%cq1 UINT nHookCount =0;
ka/>jV" static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
A01PEVd@A static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
lk*wM?Z static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
m$bYx~K static int KeyCount =0;
\NTVg6>qN static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
X2T_}{ #pragma data_seg()
!&},h= HINSTANCE hins;
;;S9kNp^v void VerifyWindow();
f cnv[B..{ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
jr(|-!RVMN //{{AFX_MSG_MAP(CHookApp)
KwNOB _ // NOTE - the ClassWizard will add and remove mapping macros here.
?{L5=X@$$ // DO NOT EDIT what you see in these blocks of generated code!
s2`} ~ //}}AFX_MSG_MAP
-e O>d} END_MESSAGE_MAP()
[gGo^^aW# L"RE[" m CHookApp::CHookApp()
`m}G{ jfk {
Y0yu, // TODO: add construction code here,
{ub'
// Place all significant initialization in InitInstance
V%'' GF }
Ji.FG"h+2 NvvD~Bb CHookApp theApp;
Q[c:A@oW LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
B[~Q0lPih {
s.^+y7$ BOOL bProcessed=FALSE;
Th
X6e if(HC_ACTION==nCode)
.oM;D~(=9 {
vRb7=fXf if((lParam&0xc0000000)==0xc0000000){// Key up
lWDSF]ZYV switch(wParam)
[Lcy &+ {
VIaj])m case VK_MENU:
dDA,Ps MaskBits&=~ALTBIT;
fu
iTy72 break;
YpgO]\/w case VK_CONTROL:
E~c>j<'-"< MaskBits&=~CTRLBIT;
WMS~Bk+! break;
8=)9ZjfD case VK_SHIFT:
_\<TjGtG MaskBits&=~SHIFTBIT;
;6$W-W _ break;
uS JLIb default: //judge the key and send message
=gC% = break;
CF6qEG6 }
:Wihb#TO) for(int index=0;index<MAX_KEY;index++){
7^;-[?l
if(hCallWnd[index]==NULL)
$9h^tP'CV continue;
Pv|sPIIB7 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
cv;2zq=T {
P6")OWd SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
liBFx6\"S bProcessed=TRUE;
b/_u\R
]-' }
7)RRCsn }
&oE'|^G }
{113B) else if((lParam&0xc000ffff)==1){ //Key down
.l,]yWwfK switch(wParam)
Y4+iNdd {
!$/P8T``M case VK_MENU:
)X3
|[4R MaskBits|=ALTBIT;
V@+X4`T break;
#\ECQF case VK_CONTROL:
8_Z"@ MaskBits|=CTRLBIT;
2UopGxrPKw break;
0+K<;5"63d case VK_SHIFT:
`a[
V_4wO MaskBits|=SHIFTBIT;
;Fd1:"1pP break;
/8 yv8 default: //judge the key and send message
*TrpW?]Y& break;
~R\ $Z }
!C(PfsrR/ for(int index=0;index<MAX_KEY;index++)
7X8*7'.2 {
#7"";"{z| if(hCallWnd[index]==NULL)
qT01@Bku continue;
?4# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]x66/O\0u {
gH.$B' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
VR'zm\< D bProcessed=TRUE;
>%5GMx>m }
lt yhYPS }
s)Xz}QPK. }
)=cJW(nfP if(!bProcessed){
o=-Af|#b for(int index=0;index<MAX_KEY;index++){
Rp!"c if(hCallWnd[index]==NULL)
!}5+hj!6 continue;
Vh^ :.y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
'J)9# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
;I6C`N }
#%pY,AK:= }
y4VO\N!
}
R2Lq??XA= return CallNextHookEx( hHook, nCode, wParam, lParam );
|WNI[49 }
F$'po# KO/#t~ BOOL InitHotkey()
^)o]hE| {
@V&HE:P if(hHook!=NULL){
*\_>=sS x; nHookCount++;
$h}w:AV: return TRUE;
;Aheeq746 }
\mZB*k)+ else
BjHp3-A' hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
8bf@<VTO_ if(hHook!=NULL)
E&Zt<pRf;2 nHookCount++;
7q{yLcC" return (hHook!=NULL);
dA<SVk*0Q }
.J=QWfqt BOOL UnInit()
<tm= {
+jS<n13T if(nHookCount>1){
DHbS=Iih nHookCount--;
n<F3&2w return TRUE;
RjR+'<7E^ }
E>:#{% BOOL unhooked = UnhookWindowsHookEx(hHook);
f%JM
a]yV if(unhooked==TRUE){
=BbXSwv'( nHookCount=0;
8Pva ]Q hHook=NULL;
O]?\<&y }
5k?xBk=< return unhooked;
#Zi6N }
VCT1GsnE +U>Y.YP BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\w&R`;b8w {
Iu(]i?Y BOOL bAdded=FALSE;
@LY[kt6o for(int index=0;index<MAX_KEY;index++){
lv~ga2>z if(hCallWnd[index]==0){
f(\S+4 hCallWnd[index]=hWnd;
C+_UIx]A HotKey[index]=cKey;
?0-3J )kW HotKeyMask[index]=cMask;
I,aaSBwt&2 bAdded=TRUE;
uL:NWgN KeyCount++;
e;LC\*dG break;
gQ|?~hYYv }
?kRx;S+ }
tOZ-]>U return bAdded;
P)~olrf }
sn
Ou LMN`<R(q] BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
YRv}w3yQ {
zm_8{Rta} BOOL bRemoved=FALSE;
N/1xc1$SB for(int index=0;index<MAX_KEY;index++){
jthyZZ if(hCallWnd[index]==hWnd){
V2:S
9vO' if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
I|2dV9y hCallWnd[index]=NULL;
Y=H_U$ HotKey[index]=0;
.bRtK+}F# HotKeyMask[index]=0;
E 0OHl bRemoved=TRUE;
jw/@]f;N KeyCount--;
m63>P4h? break;
hpq\ }
G @]n(\7Y }
`=kiqF2P} }
@RCZ![XYWg return bRemoved;
1\AcceJ|(w }
_`Y%Y6O1/ 1c*:"
k void VerifyWindow()
twt's,dO {
:bCswgd[ for(int i=0;i<MAX_KEY;i++){
P,#l~ \ if(hCallWnd
!=NULL){ s!]QG
if(!IsWindow(hCallWnd)){ %`s1
Ocvp
hCallWnd=NULL; {IF$\{Al
HotKey=0; QHsJo|.
HotKeyMask=0; 1_8@yO
KeyCount--; {$7vd
} ^* CKx
} @wVDe\% ,
} 9lkl-b6xG
} .3SP#mI
!
GtF%V
BOOL CHookApp::InitInstance() Moi>Dp
{ 07\]8^/G
AFX_MANAGE_STATE(AfxGetStaticModuleState()); bn=7$Ax
hins=AfxGetInstanceHandle(); f:AfM f>m
InitHotkey(); X|4Kdi.r@
return CWinApp::InitInstance(); B->oTC`5
} &KV$x3
B- |C%~fe
int CHookApp::ExitInstance() ]6MXG%
{ DZ:$p.
VerifyWindow(); +S1h~@c:B
UnInit(); 3GMrdG?Y
return CWinApp::ExitInstance(); 76u\#{5
} 1 l^`
SPvKq=,
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Z}IuR|=
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +O8}twt@
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ <d[GGkY]=
#if _MSC_VER > 1000 M=1~BZQ(Z
#pragma once E};1
H
#endif // _MSC_VER > 1000 gRw? <U^
#wGOlW;R
class CCaptureDlg : public CDialog [t*-s1cq
{ @# .a5
// Construction roIc1Ax:
public: a,:Nlr3
BOOL bTray; Sg(\+j=
BOOL bRegistered; eMP0BS"
BOOL RegisterHotkey(); Bi0&F1ZC!
UCHAR cKey; v5FfxDvw
UCHAR cMask; mAe)Hy %
void DeleteIcon(); 1R]h>'
void AddIcon(); q 1A0-W#4
UINT nCount; bOr6"nn
void SaveBmp(); hy3?.
CCaptureDlg(CWnd* pParent = NULL); // standard constructor I@1VX5
// Dialog Data :Yi 4Ia
//{{AFX_DATA(CCaptureDlg) H.O&seY
enum { IDD = IDD_CAPTURE_DIALOG }; ir_X65l/2
CComboBox m_Key; N`vPt?@
BOOL m_bControl; mE9ytFH\k
BOOL m_bAlt; !3"Hn
BOOL m_bShift; dAaxbP|
CString m_Path; uK[gI6M
CString m_Number; JaN53,&<
//}}AFX_DATA l5U ^lc
// ClassWizard generated virtual function overrides r90R~'5x9
//{{AFX_VIRTUAL(CCaptureDlg) +1eb@bX
public: wFJ*2W:
virtual BOOL PreTranslateMessage(MSG* pMsg); y)7;"3Q<
protected: = d !YM6G
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BbgKaC q
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .]; `
//}}AFX_VIRTUAL R1/mzPG
// Implementation y p pZ@
protected: vtq47i
HICON m_hIcon; QQ99sy
// Generated message map functions :x!'Eer
n
//{{AFX_MSG(CCaptureDlg) )r
XUJ29.
virtual BOOL OnInitDialog(); <fDbz1Q;l
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3\|PwA9fN8
afx_msg void OnPaint(); >6'brb
afx_msg HCURSOR OnQueryDragIcon(); f=>iiv
virtual void OnCancel(); V)mi1H|m
afx_msg void OnAbout(); T
0?9F2
afx_msg void OnBrowse(); ZRUI';5x
afx_msg void OnChange(); Pj7MR/AH
//}}AFX_MSG ]w!=1(
DECLARE_MESSAGE_MAP() mvyOwM
}; sw,p6T[
#endif FuP~_ E~
X-SR0x
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ,(kaC.Em
#include "stdafx.h" J^mm"2
#include "Capture.h" oho~?.F
#include "CaptureDlg.h" WAVEwA`r
#include <windowsx.h> iv6bXV'N
#pragma comment(lib,"hook.lib") %vU*4mH
#ifdef _DEBUG 3`ze<K((
#define new DEBUG_NEW _2xYDi
#undef THIS_FILE ^ E3 HY@j
static char THIS_FILE[] = __FILE__; QhPpo#^
#endif :Lq=)'d;6
#define IDM_SHELL WM_USER+1 NOtwgZ-
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y_nlIcu
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (=tu~ ^
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8qs8QK
class CAboutDlg : public CDialog rU7t~DKS
{ 9|>5;Ej
public: T{Yk/Z/}?
CAboutDlg(); *35o$P46
// Dialog Data 31mlnDif
//{{AFX_DATA(CAboutDlg) rmdG"s
enum { IDD = IDD_ABOUTBOX }; DE$T1pFV
//}}AFX_DATA ;Y$d!an0
// ClassWizard generated virtual function overrides tsf!Q
//{{AFX_VIRTUAL(CAboutDlg) a&gf0g;@I
protected: <##aD3)
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X+//$J
//}}AFX_VIRTUAL ^ANz=`N5,
// Implementation mz^[C7(q'(
protected: Q0TKM>
//{{AFX_MSG(CAboutDlg) vpu
//}}AFX_MSG NqN9
DECLARE_MESSAGE_MAP()
83:qIfF
}; KI5099 _/
lDG.\u
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) UG,n
q
{ $)7Af6xD
//{{AFX_DATA_INIT(CAboutDlg) |bjLmGb
//}}AFX_DATA_INIT ,jMV
#H[
} g)iw.M2
_B\X&!G.
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #M8>)o c
{ Jl89}Sf
CDialog::DoDataExchange(pDX); &3Mps[u:h
//{{AFX_DATA_MAP(CAboutDlg) &sS]h|2Z5
//}}AFX_DATA_MAP aGmbB7[BZ
} Wr.~Ns<
rXnG"A
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) f{#Mc
//{{AFX_MSG_MAP(CAboutDlg) ,CnUQx0
// No message handlers /Pa<I^-#
//}}AFX_MSG_MAP 90+Hv:wF
END_MESSAGE_MAP() V;]U]
GI#TMFz3
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U,nQnD"!t&
: CDialog(CCaptureDlg::IDD, pParent) BC1P3Sk
6X
{ %(kf#[zQ
//{{AFX_DATA_INIT(CCaptureDlg) 8?k.4{?
m_bControl = FALSE; B4;P)\2
m_bAlt = FALSE; 5>M@
F0
m_bShift = FALSE; < nyk:E
m_Path = _T("c:\\"); OY(znVHU
m_Number = _T("0 picture captured."); K.\-
nCount=0; m{0u+obi&w
bRegistered=FALSE; JT 5+d ,
bTray=FALSE; ,
-S n
//}}AFX_DATA_INIT o`[X _
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?a-}1A{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); vX}mwK8
} }i2dXC/
WFpR@53Db
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s&qr2'F+z
{ &bS!>_9
CDialog::DoDataExchange(pDX); TWTRMc;z+
//{{AFX_DATA_MAP(CCaptureDlg) IN94[yW{1
DDX_Control(pDX, IDC_KEY, m_Key); ~7&O[
DDX_Check(pDX, IDC_CONTROL, m_bControl); y1hJVYE2
DDX_Check(pDX, IDC_ALT, m_bAlt); ki|w?0s
DDX_Check(pDX, IDC_SHIFT, m_bShift); j_~lc,+m
DDX_Text(pDX, IDC_PATH, m_Path); '#x<Fo~hT
DDX_Text(pDX, IDC_NUMBER, m_Number); 7j%sM&
//}}AFX_DATA_MAP MYeGr3V3
} c9;oB|8|
gc{5/U9H*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Dv+:d 4|"
//{{AFX_MSG_MAP(CCaptureDlg) `z3"zso
ON_WM_SYSCOMMAND() FI(M 1iJ
ON_WM_PAINT() U>_#,j
ON_WM_QUERYDRAGICON() 9:6d,^X
ON_BN_CLICKED(ID_ABOUT, OnAbout) *gXm&/2*
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7S9Q{
ON_BN_CLICKED(ID_CHANGE, OnChange) bLyG3~P;0
//}}AFX_MSG_MAP -<B{?D
END_MESSAGE_MAP() NbW5a3=
<(-4?"1
BOOL CCaptureDlg::OnInitDialog() ,<?M/'4}G
{ a fhZM$
CDialog::OnInitDialog(); "Q<*H<e
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _7w2E
ASSERT(IDM_ABOUTBOX < 0xF000); yj{:%Km:`
CMenu* pSysMenu = GetSystemMenu(FALSE); $Uxg$p qO
if (pSysMenu != NULL) T2MX_rt#D
{ {p@uj_pS
CString strAboutMenu; j\8'P9~%
strAboutMenu.LoadString(IDS_ABOUTBOX); EM.rO/qcW
if (!strAboutMenu.IsEmpty()) &;k`3`MC~w
{ V/7?]?!xu
pSysMenu->AppendMenu(MF_SEPARATOR); prg8Iq'w
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A)q,VSR8
} 4lfJc9J
} },LW@Z}
SetIcon(m_hIcon, TRUE); // Set big icon K1>(Fs$
SetIcon(m_hIcon, FALSE); // Set small icon k|T0Bly3P
m_Key.SetCurSel(0); kXbdR
RegisterHotkey(); 7%4@*
CMenu* pMenu=GetSystemMenu(FALSE); 1
+'HKT}
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Jv=G3=.
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); XS/5y(W
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); wY j~ (P"
return TRUE; // return TRUE unless you set the focus to a control 7oI^sh k
} OT5'c l
f*SAbDE
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) g8_IZ(%:
{ &vp0zYd+v
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3 eFBe2
{ 9#@CmiIhy
CAboutDlg dlgAbout; vXM``|
dlgAbout.DoModal(); 7eg//mL"6
} L&nGjC+Lr
else VCvqiHn
{ oWUDTio#[
CDialog::OnSysCommand(nID, lParam); {m%X\s;ni
} XP-4=0 zd
} "ci<W_lx
4hv'OEl
void CCaptureDlg::OnPaint() ]& qmV
{ %lU$;cY
if (IsIconic()) RFkJ^=}
{ N]sX
r
CPaintDC dc(this); // device context for painting Ma3Hn
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dj76YK
// Center icon in client rectangle VSkx;P
int cxIcon = GetSystemMetrics(SM_CXICON); +<ey
Iw
int cyIcon = GetSystemMetrics(SM_CYICON); Up$vBE8i]
CRect rect; k]`3if5>
GetClientRect(&rect); []M+(8Z_P
int x = (rect.Width() - cxIcon + 1) / 2; uv[e0,@
int y = (rect.Height() - cyIcon + 1) / 2; G#4cWn'
// Draw the icon `&U ['_%
dc.DrawIcon(x, y, m_hIcon); 7>m#Y'ppl@
} 9bT,=b;
else U)p P^:|
{ ?Y~>H2
CDialog::OnPaint(); rkl/5z??
} |7I.DBjR;
} Bv |Z)G%RR
| JL47FR
HCURSOR CCaptureDlg::OnQueryDragIcon() ]eq3cwR[|
{ -~h2^Oez
return (HCURSOR) m_hIcon; .j4IW3)
} 5aTyM_x
O ,[aL;v
void CCaptureDlg::OnCancel() dR_hPBn/@
{ w`VmN}pR
if(bTray) y o[!q|z
DeleteIcon(); k>Qr14F
CDialog::OnCancel(); pDlh^?cux
} V@K}'f~
x9HA^Rj4-
void CCaptureDlg::OnAbout() &w3LMOT
{ 8X]j;Rb
CAboutDlg dlg; ~4*9w3t
dlg.DoModal(); xZmKKKd0*
} qhpq\[U6in
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void CCaptureDlg::OnBrowse() ^dYLB.'=
{ <S0!$.Kg*<
CString str; TR@$$RrU
BROWSEINFO bi; ][bz5aV
char name[MAX_PATH]; _ #l b\
ZeroMemory(&bi,sizeof(BROWSEINFO)); );;UNO21+
bi.hwndOwner=GetSafeHwnd(); Z-H Kdv!d
bi.pszDisplayName=name; u6jJf@!ws
bi.lpszTitle="Select folder"; (s{%XB:K
bi.ulFlags=BIF_RETURNONLYFSDIRS; s:cS 9A8
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0tB9X9 :,
if(idl==NULL) Zk}e?Grc
return; ?#D@e5Wf
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z#;ieI\
str.ReleaseBuffer(); e= "/oo
m_Path=str; =W ! m`
if(str.GetAt(str.GetLength()-1)!='\\') lLtC9:
m_Path+="\\"; ^O\tN\g;c
UpdateData(FALSE); aM.l+DP
} foE2rV/Y
O,JthlAV4
void CCaptureDlg::SaveBmp() =OO_TPEZ
{ kZGhE2np
CDC dc; /IV:JVT
dc.CreateDC("DISPLAY",NULL,NULL,NULL); x)vYc36H
CBitmap bm; {Rw~G&vQ
int Width=GetSystemMetrics(SM_CXSCREEN); a$t [}D2
int Height=GetSystemMetrics(SM_CYSCREEN); _I|wp<R
bm.CreateCompatibleBitmap(&dc,Width,Height); S_2I8G^A
CDC tdc; e@^}y4
C
tdc.CreateCompatibleDC(&dc); 7X}_yMxc
CBitmap*pOld=tdc.SelectObject(&bm); 0#*\o1r\p
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); W {dx\+
tdc.SelectObject(pOld); Z{_'V+Q1
BITMAP btm; _W#27I
bm.GetBitmap(&btm); 05pCgI}F>
DWORD size=btm.bmWidthBytes*btm.bmHeight; Z@C
D1+ G
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s9`T% pg
BITMAPINFOHEADER bih; NK#Dq&W+&
bih.biBitCount=btm.bmBitsPixel; `(B1 "qRi
bih.biClrImportant=0; a/)TJv
bih.biClrUsed=0; u{p\8v%7
bih.biCompression=0; Bdbw!zRR$
bih.biHeight=btm.bmHeight; JBUJc
bih.biPlanes=1; N{p2@_fnB
bih.biSize=sizeof(BITMAPINFOHEADER); <O\z`aA'q
bih.biSizeImage=size; FT(EH
bih.biWidth=btm.bmWidth; [V jd)%
bih.biXPelsPerMeter=0; y'yaCf
bih.biYPelsPerMeter=0; 4?yc/F=kI
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;- ]f4O8
static int filecount=0; qs-:JmA_w
CString name; \HK#d1>ox
name.Format("pict%04d.bmp",filecount++); :f/ p5c
name=m_Path+name; U-n33ty`H
BITMAPFILEHEADER bfh; ax>c&%vo
bfh.bfReserved1=bfh.bfReserved2=0; @fE^w^K7
bfh.bfType=((WORD)('M'<< 8)|'B'); cF vGpZ
bfh.bfSize=54+size; (c[h,>`@:
bfh.bfOffBits=54; ki+9Ln;
CFile bf; /CA)R26G
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ v@t*iDa?7
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3UN Jj&-`
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !&'xkw `
bf.WriteHuge(lpData,size); &aF_y_f\
bf.Close(); %W&=]&L
nCount++; A&t'uY6
} swLgdk{8n
GlobalFreePtr(lpData); [#R%jLEJ2
if(nCount==1) :sPku<1is
m_Number.Format("%d picture captured.",nCount); 8v]{ 5
else TyBNRnkt
m_Number.Format("%d pictures captured.",nCount); hU=J^Gi0
UpdateData(FALSE); Z(}x7j zW
} )uX:f8
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fnmZJJ,Q
{ LiB0]+wzj
if(pMsg -> message == WM_KEYDOWN) m1[QD26
{ *V"cu
if(pMsg -> wParam == VK_ESCAPE) s~]nsqLt9p
return TRUE; '}rDmt~
if(pMsg -> wParam == VK_RETURN) $Jr`4s
return TRUE; D 1hKjB&
} 'Yd%Tb|*
return CDialog::PreTranslateMessage(pMsg); Q^p@ 1I
} +tV(8h4
*UyV@
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TM^1{0;r5
{ =AKW(v
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^g[])2",
SaveBmp(); ,^<+5TYM7
return FALSE; HRb_ZJz
} Txfb-f!mv\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (bo bKr
CMenu pop; 1I@4xC
#X
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); M5x!84
CMenu*pMenu=pop.GetSubMenu(0); c~tSt.^WX
pMenu->SetDefaultItem(ID_EXITICON); _N-7H\hF
CPoint pt; eh`V#%S=
GetCursorPos(&pt); zPw
R1>gL
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "pWdz}!
if(id==ID_EXITICON) AQiP2`?
DeleteIcon(); TAAsV#l
else if(id==ID_EXIT) [y{ag{
OnCancel(); Bs1-UI}+
return FALSE; O?2<rbx
} n7MS{`
LRESULT res= CDialog::WindowProc(message, wParam, lParam); c'|MC[^A
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) MV/~Rmd.
AddIcon(); cUm9s>^)/
return res; Fhsmpe~
}
yCkm|
|v1 K@
void CCaptureDlg::AddIcon() fN4pG*D
{ eN-{
NOTIFYICONDATA data; vXnpx}B
data.cbSize=sizeof(NOTIFYICONDATA); 3=<iGX"z
CString tip; 52["+1g\
tip.LoadString(IDS_ICONTIP); ILO+=xU
data.hIcon=GetIcon(0); LQh\j|e9
data.hWnd=GetSafeHwnd(); <eh(~
strcpy(data.szTip,tip); JyqFFZ&
data.uCallbackMessage=IDM_SHELL; h#n8mtt&i
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;OPCBd r
data.uID=98; Z*TW;h0ZQ3
Shell_NotifyIcon(NIM_ADD,&data); _kx
ShowWindow(SW_HIDE); EU@mrm?
bTray=TRUE; TcP1"wc
} =Hx~]1
N*SgP@Bt
void CCaptureDlg::DeleteIcon() /SUV'J)
{ QlS5B.h,
NOTIFYICONDATA data; x ?V/3zW
data.cbSize=sizeof(NOTIFYICONDATA); nfJ8Rt
data.hWnd=GetSafeHwnd(); k41la?
data.uID=98; op|mRJBq;
Shell_NotifyIcon(NIM_DELETE,&data); ~4>Xi*
B
ShowWindow(SW_SHOW); &53#`WgJ
SetForegroundWindow(); V-cuG.
ShowWindow(SW_SHOWNORMAL); #pe{:f?
bTray=FALSE; mWusRgj+8
} Ad,r(0a LZ
qbEj\
b[
void CCaptureDlg::OnChange() 9V66~Bf5
{ hY1|qp
RegisterHotkey(); AslH
V@K
} >#:/
GN?
NDOZ!`LqH
BOOL CCaptureDlg::RegisterHotkey() Uo @NK
{ E?XCL8NC
UpdateData(); XsOOkf\_
UCHAR mask=0; C^%zV>o
UCHAR key=0; 9_Re,h
if(m_bControl) "pZ3
mask|=4; g&"(- :
if(m_bAlt) |x6mkSf]ke
mask|=2; ]v{fFmL
if(m_bShift) NVjJ/
mask|=1; }m9LyT=~$
key=Key_Table[m_Key.GetCurSel()]; ;/V@N |$n
if(bRegistered){ ~^^ey17
DeleteHotkey(GetSafeHwnd(),cKey,cMask); [\b_+s)eN
bRegistered=FALSE; /SXz_e
} qp W#!Vbx
cMask=mask; 7idi&h"
cKey=key; [)3 U])w/
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); B
(1,Rq[
return bRegistered; <]'"e]
} p0rwiBC=q
@1F 'V'
四、小结 0H3T'J%r
$&8h=e~]-
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。