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:
n[e C
:@jctH~ 一、实现方法
%ZD]qaU0 P\K#q%8 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:
DgcS@N %J2Ad #pragma data_seg("shareddata")
U&6A)SW,k HHOOK hHook =NULL; //钩子句柄
(${:5W UINT nHookCount =0; //挂接的程序数目
,Tar?&C: static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
k^|z.$+ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
]@Y!,bw& static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
IrZ\;!NK static int KeyCount =0;
&4evh<z static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
>3D1:0Sg #pragma data_seg()
67&IaDts I)1ih 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。
Mj1f;$ :(ql=+vDb4 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:
_+9i |U1 [R\X BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
"{~FEx4 cKey,UCHAR cMask)
:|kO}NGM {
;b65s9n^b BOOL bAdded=FALSE;
QAx9W% for(int index=0;index<MAX_KEY;index++){
xP~GpVhLF if(hCallWnd[index]==0){
ds+K7B$ hCallWnd[index]=hWnd;
*~
I HVU HotKey[index]=cKey;
a]fFR~OY HotKeyMask[index]=cMask;
ZKrK>X bAdded=TRUE;
?xUl_ KeyCount++;
)t+pwh!8 break;
U[3w9 }
=(hBgNH }
mK$E&,OkA return bAdded;
_4)
t }
:Ef!gpS}?R //删除热键
8tSY|ME BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
oQh;lb {
lHM}
E$5 BOOL bRemoved=FALSE;
0~ nCT&V for(int index=0;index<MAX_KEY;index++){
FJH>P\+ if(hCallWnd[index]==hWnd){
\EU3i;BNT% if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
][l5S*CC_ hCallWnd[index]=NULL;
GC# [&>L HotKey[index]=0;
|sr\SCx HotKeyMask[index]=0;
9^g8VlQdT bRemoved=TRUE;
sx azl] KeyCount--;
+|bmUm<2 break;
Zs/-/C| }
6_" n }
\?v&JmEU }
$/
"+t.ir3 return bRemoved;
(BtU\f#d }
eCKm4l'BZ 9~j"6wS i_m&qy<v DLL中的钩子函数如下:
V0m1>{ M:OZWYQ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<-N eusx% {
xib}E[-l# BOOL bProcessed=FALSE;
p'^}J$ if(HC_ACTION==nCode)
yB7si(,1> {
=%I[o=6 if((lParam&0xc0000000)==0xc0000000){// 有键松开
Tx&H1 switch(wParam)
S+KKGi_e {
bj0HAgY@ case VK_MENU:
32+N?[9
* MaskBits&=~ALTBIT;
;DX{+Z[ break;
Q(N'Oj:J case VK_CONTROL:
0_je@p+$
MaskBits&=~CTRLBIT;
"24d:vf\ break;
6[XaIco=C case VK_SHIFT:
9nQyPb6 MaskBits&=~SHIFTBIT;
ApSseBhh break;
_:Q^mV=;j default: //judge the key and send message
}P%gwgPK break;
$I-iq
@ }
i / o for(int index=0;index<MAX_KEY;index++){
`2U,#nZ 4 if(hCallWnd[index]==NULL)
"?k'S{; continue;
+,"[0RH if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
fXnTqKAfu6 {
} -4p8Zt SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
z|AknEE, bProcessed=TRUE;
&/uakkS }
{=I,+[( }
exSwx-zxI }
"fNv(> -7s else if((lParam&0xc000ffff)==1){ //有键按下
jS3@Z?x?* switch(wParam)
o/
\o-kC} {
`::j\3B&Y- case VK_MENU:
Us "G X_ MaskBits|=ALTBIT;
#q34>}O< O break;
6T~+vT case VK_CONTROL:
Kg2@]J9m MaskBits|=CTRLBIT;
( AA@sN break;
xF) .S@ case VK_SHIFT:
*]q`:~u2 MaskBits|=SHIFTBIT;
</<z7V,{ break;
n @@tO#!\ default: //judge the key and send message
tZ=|1lM break;
/Tl ybSC1 }
)N{PWSPs for(int index=0;index<MAX_KEY;index++){
8z=o.\@ if(hCallWnd[index]==NULL)
"e\73?P continue;
O+XQP!T if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
@:hWahMy {
W{ozZuo SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
AS0(NlV bProcessed=TRUE;
Qh3+4nLFtb }
)I<VH+6 }
|'i ?o }
Jnt
r"a-4 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
tMf5TiWu@ for(int index=0;index<MAX_KEY;index++){
Rbm+V{EF& if(hCallWnd[index]==NULL)
')F@em continue;
-, =)O if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Np9Pae' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\iEJ9V //lParam的意义可看MSDN中WM_KEYDOWN部分
ZKI` ; }
PK?}hz }
D0f7I:i1 }
S#+ _HFUK{ return CallNextHookEx( hHook, nCode, wParam, lParam );
`,GFiTPd }
K24y;968 cP/( 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:
<9=RLENmY" QQHC
1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
6*ZZ)W< BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
t@cBuV`9c :i?c 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:
Qw%0<~< Z#%77!3 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
3_VWtGQ {
qj*BV if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
jq/{|<0 {
&xlOsr/n //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
d9
8pv% SaveBmp();
v Ma$JPauI return FALSE;
WFeaX7\b }
5U<o%+^El …… //其它处理及默认处理
;NJM3g0I }
n |,} 4P24ySy9F y7*^H 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。
BYS>" hW cM. 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。
NX+
eig</- ;rF:$37^ 二、编程步骤
I#p-P)Q%S )./'RE+(k 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";
6B?1d
/8V 0j/i):@ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
~ YZi"u qn\>(& 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;
GWShv\c} B T{({3 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;
uqy~hY p@znmn- 5、 添加代码,编译运行程序。
^h|'\-d\ n_] OYG>U 三、程序代码
483vFLnF QaEXk5>e ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
`Sj8<O} #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
naB[0I&
N #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
z!j`Qoh?V9 #if _MSC_VER > 1000
WHF:>0B #pragma once
XlNB9\"5 #endif // _MSC_VER > 1000
s*}d`"YvH #ifndef __AFXWIN_H__
0$49X #error include 'stdafx.h' before including this file for PCH
PsD]gN5" #endif
sAc)X!} #include "resource.h" // main symbols
Un[#zh<4 class CHookApp : public CWinApp
&jPsdv h {
gzdgnF2 public:
r>q`# ~ CHookApp();
8i"{GGVC // Overrides
J.`.lQ$z // ClassWizard generated virtual function overrides
*XzUqK //{{AFX_VIRTUAL(CHookApp)
u09OnP\ public:
~JT{!wcE}o virtual BOOL InitInstance();
e S
Fmx virtual int ExitInstance();
;6)|'3.B9 //}}AFX_VIRTUAL
CnA*o 8w //{{AFX_MSG(CHookApp)
Kd,m;S\ // NOTE - the ClassWizard will add and remove member functions here.
XJOo.Y // DO NOT EDIT what you see in these blocks of generated code !
-)<Nd:A //}}AFX_MSG
!8s:3] DECLARE_MESSAGE_MAP()
khu,P[3> };
CGg6n CB LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
D{z=)'/F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
qC|re!K BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
aA
yFu_ BOOL InitHotkey();
->#7_W BOOL UnInit();
&k{@:z #endif
AU$5"kBE h/w- &7t //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
42Ffx?Qmv #include "stdafx.h"
{5z?5i ?D #include "hook.h"
>\p}UPx #include <windowsx.h>
,!py
n<_ #ifdef _DEBUG
@',;/j80 #define new DEBUG_NEW
da^9Fb #undef THIS_FILE
<?nr"V static char THIS_FILE[] = __FILE__;
/iQ>he~fy #endif
yq,5M1vR #define MAX_KEY 100
SO&;]YO #define CTRLBIT 0x04
EX5kF #define ALTBIT 0x02
?%0i,p@< #define SHIFTBIT 0x01
QY fS- #pragma data_seg("shareddata")
"7
4 L HHOOK hHook =NULL;
]V]o%onW UINT nHookCount =0;
,^,J[F static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
bU,&|K/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
BPOWo8TqD^ static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
) D`_V.,W static int KeyCount =0;
BZ T%+s;u9 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
&boBu^,94 #pragma data_seg()
q.X-2jjpx: HINSTANCE hins;
(6+0U1[Iz void VerifyWindow();
Ek.j@79 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
RGKJO_*J2 //{{AFX_MSG_MAP(CHookApp)
5LK>n- // NOTE - the ClassWizard will add and remove mapping macros here.
liB>~DVC // DO NOT EDIT what you see in these blocks of generated code!
g?+P&FL#I //}}AFX_MSG_MAP
t2$:*PvE END_MESSAGE_MAP()
U5PCj ]-Xt 8UZEC-K CHookApp::CHookApp()
Te/)[I'Tn {
ixkg, // TODO: add construction code here,
0nd<6S+fs // Place all significant initialization in InitInstance
MLb\:Ihy }
G j:| \dMsv1\ CHookApp theApp;
[)=FZF6kG LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
x"d*[m {
3WVHI$A9 BOOL bProcessed=FALSE;
$_UF9l0 if(HC_ACTION==nCode)
&pAT {
pQ hv3F if((lParam&0xc0000000)==0xc0000000){// Key up
w{qYP switch(wParam)
Vqr&)i"b$ {
uQNoIy J) case VK_MENU:
1WKDG~ MaskBits&=~ALTBIT;
W2k~N X#@ break;
Glr.)PA case VK_CONTROL:
sig_2; MaskBits&=~CTRLBIT;
3N21[i2/m break;
$p@g#3X` case VK_SHIFT:
{Q"<q`c MaskBits&=~SHIFTBIT;
tpD?-`9o break;
4c yv
8 default: //judge the key and send message
*%e#)sn* break;
3WYW]) }
m}E$6E^~O for(int index=0;index<MAX_KEY;index++){
koU.`l. if(hCallWnd[index]==NULL)
z,EOyi continue;
!]nCeo if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
hg~fFj3ST {
Kna'5L5" SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
J @fE") bProcessed=TRUE;
4SrK]+| }
^s*} 0 }
VGq]id{*$ }
.wSAysiQ|P else if((lParam&0xc000ffff)==1){ //Key down
v>5F[0gE switch(wParam)
GXl?Zg {
V_kE"W) case VK_MENU:
sFTIRVXN, MaskBits|=ALTBIT;
jj2UUQ| break;
4Ojw&ys@V case VK_CONTROL:
.%A2 MaskBits|=CTRLBIT;
\v_C7R;& break;
,d+mT^jN case VK_SHIFT:
]lY9[~
v MaskBits|=SHIFTBIT;
loJ0PY'}= break;
wGH@I_cy> default: //judge the key and send message
%r"GL break;
9vu8koL }
u|c+w)a for(int index=0;index<MAX_KEY;index++)
-Me\nu8(RF {
;=OH=+Rl if(hCallWnd[index]==NULL)
5PPpX =\ continue;
oX~CTunP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
v2'JL(= {
&?nF';& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
"q.uiz+1: bProcessed=TRUE;
di5_5_$`o }
O~el2 }
Q:\hh=^ }
_1'Pb/1 if(!bProcessed){
;GSJnV for(int index=0;index<MAX_KEY;index++){
*&]l if(hCallWnd[index]==NULL)
2LU'C,o? continue;
UJ[a&b if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
$EIkk= z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
D,/9rH }
Ah6x2(: }
08a|]li }
[Bo$? return CallNextHookEx( hHook, nCode, wParam, lParam );
KF)i66 }
B(LV22# val<N293L> BOOL InitHotkey()
(T01hR& {
j+hoj2( if(hHook!=NULL){
b*KZe[#M1 nHookCount++;
W\7*T1TDj return TRUE;
v_0!uT5~NE }
ay4xOwcR else
r
`dU
(T! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
-huZnDN if(hHook!=NULL)
=jt_1L4 nHookCount++;
4#q JX)/ return (hHook!=NULL);
FF/R_xnx }
E,@UM$alP BOOL UnInit()
df& |Lc1J {
~x:]ch| if(nHookCount>1){
-;$/< nHookCount--;
vM/v}6;_K2 return TRUE;
5QJL0fc }
/p0LtUMu BOOL unhooked = UnhookWindowsHookEx(hHook);
us%RQ8=k if(unhooked==TRUE){
zQ}N
mlk nHookCount=0;
!++62Lf hHook=NULL;
8zWPb }
[Gy'0P(EQ return unhooked;
~*[4DQ[\ }
5FI>T=QF 1 ,'^BgI, BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
c&-$?f
r {
C:MGi7f BOOL bAdded=FALSE;
x~^I/$ for(int index=0;index<MAX_KEY;index++){
|81N/]EER if(hCallWnd[index]==0){
6~WE#z_ hCallWnd[index]=hWnd;
o q)"1 HotKey[index]=cKey;
V&v~kzLr+ HotKeyMask[index]=cMask;
W2qQKv bAdded=TRUE;
w lg#c6#q KeyCount++;
22~X~= break;
wtLMc }
mtddLd, }
q)+n2FM return bAdded;
:OaQq@V }
1o 78e2B :0/o?'s BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
b]?;R {
x)ZH;) BOOL bRemoved=FALSE;
RLNuH2y; for(int index=0;index<MAX_KEY;index++){
.6o y>4 if(hCallWnd[index]==hWnd){
hP8&n9o if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$4JX#lkt hCallWnd[index]=NULL;
)%w8>1}c HotKey[index]=0;
DW&')gfQ HotKeyMask[index]=0;
yuDd%
1k bRemoved=TRUE;
q.Z#7~6`3 KeyCount--;
u#k,G` break;
AiK4t- }
BrMp_M }
| V,jd }
~j#6 goKn return bRemoved;
8k?L{hF|nW }
}AZx/[k
|z *[:CbFE0y void VerifyWindow()
Yka&Kkw {
\ZWmef for(int i=0;i<MAX_KEY;i++){
F{~r7y;0 if(hCallWnd
!=NULL){ @ ]wem
if(!IsWindow(hCallWnd)){ ULmdt
hCallWnd=NULL; {0WIDD
HotKey=0; 4Xk;Qd
HotKeyMask=0; F6]!?@
KeyCount--; 4 ~YQ\4h=
} +gCy@_2;
} P Xn>x8z
} 1'm`SRX#e
} {<4?o?
1g
6@;L$QYY-V
BOOL CHookApp::InitInstance() _|wY[YJ[
{ ikG9l&n
AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4eL54).1O
hins=AfxGetInstanceHandle(); 1"B9Z6jf
InitHotkey(); @ZR4%A"X4
return CWinApp::InitInstance(); 8!Mzr1:
} ,xe@G)a
%aE7id>v6
int CHookApp::ExitInstance() (`.qG
&6p
{ G:C6`uiy`
VerifyWindow(); <&EO=A
UnInit(); "|r^l
return CWinApp::ExitInstance(); s1 ^mk]
} ! vVjZ
p2DNbY\]
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file as|c`4r\O
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y1aF._Z
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `=$jc4@J
#if _MSC_VER > 1000 Z6([/n
#pragma once wp*&&0O!
#endif // _MSC_VER > 1000 9iddanQA
7a]Zws
class CCaptureDlg : public CDialog V -4*nV
{ pMZf!&tM
// Construction n.6
0$kR`
public: U2>dwn
BOOL bTray; Fif^V
BOOL bRegistered; h)l&K%4;
BOOL RegisterHotkey(); cc(r,ij~4
UCHAR cKey; sa(M66KkU
UCHAR cMask; -WBz]GW4r
void DeleteIcon(); o7a6 )2JK
void AddIcon(); mc=!X
UINT nCount; .Jat^iFj0
void SaveBmp(); IQi[g~E.5
CCaptureDlg(CWnd* pParent = NULL); // standard constructor [(hvK{)
// Dialog Data |od4kt
//{{AFX_DATA(CCaptureDlg) ;n7|.O]*
enum { IDD = IDD_CAPTURE_DIALOG }; R ms01m>Y
CComboBox m_Key; kPX2e h
BOOL m_bControl; pM'IQ3N
BOOL m_bAlt; 5v>{Z0TE[6
BOOL m_bShift; qwNKRqT
CString m_Path; G9y12HV
CString m_Number; NuS|X
//}}AFX_DATA {}J@+Zsi
// ClassWizard generated virtual function overrides (06Vcqg
//{{AFX_VIRTUAL(CCaptureDlg) ;ko[(eFN@
public: MLD>"W
virtual BOOL PreTranslateMessage(MSG* pMsg); e]*=sp!T
protected: _QMHPRELk
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _?]BVw
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); fByh";<`P
//}}AFX_VIRTUAL l88a#zUQDN
// Implementation +x9"#0|k;
protected: Q#ZD&RZ9.
HICON m_hIcon; yK%GsCJd:
// Generated message map functions <X I35\^
//{{AFX_MSG(CCaptureDlg) 4>"cc@8&~
virtual BOOL OnInitDialog(); 4lh
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p-'6_\F.Ke
afx_msg void OnPaint(); NzeI/f3K5
afx_msg HCURSOR OnQueryDragIcon(); 'f?&EsIV?
virtual void OnCancel(); eFj6p<
afx_msg void OnAbout(); _z(5e
afx_msg void OnBrowse(); Ad`[Rt']kI
afx_msg void OnChange(); B`?N0t%X
//}}AFX_MSG .xLF}{u
DECLARE_MESSAGE_MAP() C=dx4U~
}; *n*N|6+
#endif PZ!dn%4jy
#?$'nya*u
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file X#kjt)W
#include "stdafx.h" I~]Q55
#include "Capture.h" (XG[_
#include "CaptureDlg.h" IzGB
#include <windowsx.h> R<lNk<
#pragma comment(lib,"hook.lib") ]zvVY:v
#ifdef _DEBUG +>!B(j\gx
#define new DEBUG_NEW 5e/qgI)M5
#undef THIS_FILE C>:/(O
static char THIS_FILE[] = __FILE__; T$8@2[
#endif ZH;y>Z
#define IDM_SHELL WM_USER+1 kToVBU$
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @`kiEg'Q
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d(DX(xg
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :<t{ =0G
class CAboutDlg : public CDialog 8G5)o`
{ Nr]8P/[~
public: )pZekh]v
CAboutDlg(); ANFg]g.Az
// Dialog Data .?i-rTF:
//{{AFX_DATA(CAboutDlg) C'8!cPFVv
enum { IDD = IDD_ABOUTBOX }; EOBs}M;
//}}AFX_DATA jI{~s]Q
// ClassWizard generated virtual function overrides m,@1LwBH
//{{AFX_VIRTUAL(CAboutDlg) F[7Kw"~J
protected: d@D;'2}Yc
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X@yr$3vC
//}}AFX_VIRTUAL ;X$q#qzN#
// Implementation o/dMm:TF
protected: W) 33;E/}
//{{AFX_MSG(CAboutDlg) K{zCp6
//}}AFX_MSG `dgM|.w5=
DECLARE_MESSAGE_MAP() !O F?xW
}; :PFx&
%l8*t$8
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S7UZGGjTk
{ ib(>vp$V
//{{AFX_DATA_INIT(CAboutDlg) SvX=isu!.
//}}AFX_DATA_INIT UBhciZ
} Y3P.|
uO
?Od
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]<8B-D?Z
{ 8NaL{j1`
CDialog::DoDataExchange(pDX); zmB31' _
//{{AFX_DATA_MAP(CAboutDlg) w*<Y$hnBzF
//}}AFX_DATA_MAP [:nx);\
} >k&8el6h
Q$|^~
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |-(IJG#)
//{{AFX_MSG_MAP(CAboutDlg) jJ*@5?A
// No message handlers XdGpW
//}}AFX_MSG_MAP J7'f@X~nM
END_MESSAGE_MAP() pK6e/eC
m feMmKFu\
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?~aZ#%*i8
: CDialog(CCaptureDlg::IDD, pParent) 2ec$xms
{ tLD~
//{{AFX_DATA_INIT(CCaptureDlg) *t#s$Ga
m_bControl = FALSE; poXLy/K
m_bAlt = FALSE; @%EE0)IA
m_bShift = FALSE; XOysgX0g
m_Path = _T("c:\\"); 5!'R'x5e
m_Number = _T("0 picture captured."); HDF!`
nCount=0; o%Be0~n'
bRegistered=FALSE; AezvBY0'`z
bTray=FALSE; J+)'-OFt0
//}}AFX_DATA_INIT k]SAJ~bS|
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Z0[)u_<
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %6NO 0 F^
} .
]o3A8
<`R|a *
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \!+-4,CbZY
{ [ME}Cv`?<E
CDialog::DoDataExchange(pDX); u\{qH!?t
//{{AFX_DATA_MAP(CCaptureDlg) ]Q6+e(:~ZH
DDX_Control(pDX, IDC_KEY, m_Key); I#|ocz
DDX_Check(pDX, IDC_CONTROL, m_bControl); .q0218l:dF
DDX_Check(pDX, IDC_ALT, m_bAlt); .O5LI35,
DDX_Check(pDX, IDC_SHIFT, m_bShift); r-RCe3%g%
DDX_Text(pDX, IDC_PATH, m_Path); w=f0*$ue+w
DDX_Text(pDX, IDC_NUMBER, m_Number); NXzU0
//}}AFX_DATA_MAP tmO;:n<N
} )Qh>0T+(
cS<TmS!
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Qw24/DJK
//{{AFX_MSG_MAP(CCaptureDlg) Z69+yOJI
ON_WM_SYSCOMMAND() N#(jK1`y
ON_WM_PAINT() 8{R_6BS
ON_WM_QUERYDRAGICON() ! jbEm8bt
ON_BN_CLICKED(ID_ABOUT, OnAbout) )!'n&UxPo$
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )\{'fF
ON_BN_CLICKED(ID_CHANGE, OnChange) IK*oFo{C=K
//}}AFX_MSG_MAP Y%<`;wK=^
END_MESSAGE_MAP() \*f;!{P{
#*!+b
BOOL CCaptureDlg::OnInitDialog() (Ij0AeJ#
{ F,*2#:Ki
CDialog::OnInitDialog(); 28nmQ
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Gs[Vu@*
ASSERT(IDM_ABOUTBOX < 0xF000); cCM
j\H@
CMenu* pSysMenu = GetSystemMenu(FALSE); UdT&cG
if (pSysMenu != NULL) / Zo~1q
{ P3'2IzNw
CString strAboutMenu; +"]oc{W!
strAboutMenu.LoadString(IDS_ABOUTBOX); Zxg 1M
if (!strAboutMenu.IsEmpty()) {5T0RL{\N
{ 9*#$0Y=
pSysMenu->AppendMenu(MF_SEPARATOR); m)s
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pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <"*"1(wN
} ZhH+D`9
} mfXD1]<.
SetIcon(m_hIcon, TRUE); // Set big icon `.{U-U\
SetIcon(m_hIcon, FALSE); // Set small icon o_iEkn
m_Key.SetCurSel(0); pG/
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RegisterHotkey(); yh S#&)O
CMenu* pMenu=GetSystemMenu(FALSE); WK
pUn8&N
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); /&CUspb
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CV '&4oq
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B,3 t`
return TRUE; // return TRUE unless you set the focus to a control 9'1hjd3k
} D9ANm"#
"$GK.MP5
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `SCy<w3$+[
{ TbOJp
if ((nID & 0xFFF0) == IDM_ABOUTBOX) [}z?1Gj;W(
{ IuNkfBe4m
CAboutDlg dlgAbout; ]Z_$'?f
dlgAbout.DoModal(); l;Q
>b]DZ
} ylk{!
else 4[`[mE18.
{ Vl<`|C>
CDialog::OnSysCommand(nID, lParam); aiYo8+{!#
} kEO1TS
} _*Pfp+if
aC`Li^
void CCaptureDlg::OnPaint() }/20%fP
{ y =R
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if (IsIconic()) NdZ)[f:2
{ }d_<\
CPaintDC dc(this); // device context for painting P*0f~eu
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `%|u!
// Center icon in client rectangle *xPB<v2N:P
int cxIcon = GetSystemMetrics(SM_CXICON); ugno]5Ni
int cyIcon = GetSystemMetrics(SM_CYICON); pjACFVMFX
CRect rect; zt?h^zf}
GetClientRect(&rect); 0A.PD rM:
int x = (rect.Width() - cxIcon + 1) / 2; _ j~4+H
int y = (rect.Height() - cyIcon + 1) / 2; oew|23Ytb
// Draw the icon qmEoqU
dc.DrawIcon(x, y, m_hIcon); j~epbl)pC
} 0{Bf9cH
else _74UdD{^o
{ m=H_?W;
CDialog::OnPaint(); >)LAjwhBp
} u*hH}
} d<#p %$A4
QO2Ut!Y
HCURSOR CCaptureDlg::OnQueryDragIcon() 7{-@}j`
{ W,Ty=:qm*
return (HCURSOR) m_hIcon; 3Y`>6A=
} zO%w_7w
:<|Z.4}kJb
void CCaptureDlg::OnCancel() [UoqIU
{ mH)OB?+lq
if(bTray) GMBJjP&R]
DeleteIcon(); /jR8|sb
CDialog::OnCancel(); Wm(:P
} 2 l(Dee Y
Xtkw Z3
void CCaptureDlg::OnAbout() 8)pB_en3sO
{ L?HF'5o
CAboutDlg dlg; c}%es=@
dlg.DoModal(); Ah (iE
} e8{^f]5
G]-%AO{K
void CCaptureDlg::OnBrowse() 7%4.b7Q
{ 7,h3V=^)Q
CString str; Qwv '<
BROWSEINFO bi; 9\AS@SH{^T
char name[MAX_PATH]; wlr Ign%
ZeroMemory(&bi,sizeof(BROWSEINFO)); 7H%_sw5S.
bi.hwndOwner=GetSafeHwnd(); uJY.5w
bi.pszDisplayName=name; S6GMUaR
bi.lpszTitle="Select folder"; Wab.|\c
bi.ulFlags=BIF_RETURNONLYFSDIRS; [t{](-
LPITEMIDLIST idl=SHBrowseForFolder(&bi); .a:Z!KF
if(idl==NULL) VD/&%O8n
return; Lyr2(^#:
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G?<pBMy
str.ReleaseBuffer(); LJWTSf"f?
m_Path=str; _dr*`yXi
if(str.GetAt(str.GetLength()-1)!='\\') frc{>u~t
m_Path+="\\"; E67XPvo1+@
UpdateData(FALSE); MKC$;>i
} 7/?DP wbx
Y%g "Y
void CCaptureDlg::SaveBmp() V9T
4+
{ N<liS3>
CDC dc; K_>/lirE?
dc.CreateDC("DISPLAY",NULL,NULL,NULL); y@A6$[%(E|
CBitmap bm; ^X&)'H
int Width=GetSystemMetrics(SM_CXSCREEN); &dRjqn^&X
int Height=GetSystemMetrics(SM_CYSCREEN); ra:GzkIw
bm.CreateCompatibleBitmap(&dc,Width,Height); :CTL)ad2
CDC tdc; ,]7XMU3
tdc.CreateCompatibleDC(&dc); &2{]hRM
CBitmap*pOld=tdc.SelectObject(&bm); c|lU(Tf
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #W|!fILL
tdc.SelectObject(pOld); q`^3ov^</
BITMAP btm; WYLX?x
bm.GetBitmap(&btm); >)^NJ2Fd
DWORD size=btm.bmWidthBytes*btm.bmHeight; <Y>3
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,eXFN?CB
BITMAPINFOHEADER bih; W`x)=y]Z
bih.biBitCount=btm.bmBitsPixel; 1~@|eWr|
bih.biClrImportant=0; )~}PgbZ^
bih.biClrUsed=0; +9zA^0
bih.biCompression=0; ~KRnr0
bih.biHeight=btm.bmHeight; q5p e~
bih.biPlanes=1; E0YU[([G
bih.biSize=sizeof(BITMAPINFOHEADER); eu9w|g
bih.biSizeImage=size; X`1p'JD
bih.biWidth=btm.bmWidth; t#5:\U5r.
bih.biXPelsPerMeter=0; TEWAZVE*
bih.biYPelsPerMeter=0; y9!:^kDI
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); M"(6&M=?
static int filecount=0; sJ~P:g
CString name; c&*l"
name.Format("pict%04d.bmp",filecount++); hk}
t:<
name=m_Path+name; 5
`=KyHi:b
BITMAPFILEHEADER bfh; t77'fm
bfh.bfReserved1=bfh.bfReserved2=0; Ea]T>4
bfh.bfType=((WORD)('M'<< 8)|'B'); =/9<(Tt%m
bfh.bfSize=54+size; Q]#Z9 H
bfh.bfOffBits=54; a5?A!k\2
CFile bf; KjOi(YUnq7
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ffk4mhH
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); wyw <jH
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); iyj3QLqE
bf.WriteHuge(lpData,size); r6t&E%b
bf.Close(); nY0sb8lZJ
nCount++; hVUIBJ/5(-
} C[8Kl D
GlobalFreePtr(lpData); \Y e%o}.{
if(nCount==1) iBoEZEHjw
m_Number.Format("%d picture captured.",nCount); lKWr=k~
else <*Ub2B[m
m_Number.Format("%d pictures captured.",nCount); Dm%%e o
UpdateData(FALSE); s.:r;%a
} aZKXD! 4
#
X/Q
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) J3B.-XJ+n
{ VR4%v9[1
if(pMsg -> message == WM_KEYDOWN) y|sma;D
{ 4AHL3@x
if(pMsg -> wParam == VK_ESCAPE) e4[) WNR
return TRUE; dy:d=Z
if(pMsg -> wParam == VK_RETURN) _Adsq8sFW
return TRUE; K-(;D4/sQE
} d>!p=O`>{q
return CDialog::PreTranslateMessage(pMsg); {/ &B!zvl
} h8=h >W-
S}7>RHe
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) RmO yGSO
{ 4seciz0?
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f#P_xn&et
SaveBmp(); x?L hq2
return FALSE; V]c5
Z$Bd
} 5pJ*1pfeo
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L~eAQR
CMenu pop; bUs|t
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t5)J;0/
CMenu*pMenu=pop.GetSubMenu(0); TyOH`5D
pMenu->SetDefaultItem(ID_EXITICON); #DUh(:E'`
CPoint pt; _tj&Psp
GetCursorPos(&pt); nwf7M#3d
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4#:\?HAu!
if(id==ID_EXITICON) ~NNv>5t5
DeleteIcon();
%+wF"
else if(id==ID_EXIT) }-p,iTm
OnCancel();
zu<3^=3
return FALSE; @^?XaU
} YwAnqAg
LRESULT res= CDialog::WindowProc(message, wParam, lParam); kon=il<@
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p)/
p!d[T/
AddIcon(); ' qy#)F
return res; 7lU.Nit
} ow.j+<M
oT3Y!Y3=<
void CCaptureDlg::AddIcon() ` X}85
{ / Z!i;@Wf
NOTIFYICONDATA data; D$nK`r
data.cbSize=sizeof(NOTIFYICONDATA); K"l0w**Og#
CString tip; @\}YAa>>"I
tip.LoadString(IDS_ICONTIP); @ Nb%L&=P8
data.hIcon=GetIcon(0); X/+OF'po
data.hWnd=GetSafeHwnd(); M<[?g5=#
strcpy(data.szTip,tip); CgnXr/!L
data.uCallbackMessage=IDM_SHELL; VXIQw'Cq
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XP;x@I#l
data.uID=98; d+}k g
Shell_NotifyIcon(NIM_ADD,&data); (1){A8=?o
ShowWindow(SW_HIDE); 3k'.(P|F
bTray=TRUE; de YyaV
} aws"3O%
uW
.7Kk2Y
void CCaptureDlg::DeleteIcon() &iSD/W
{ E*|tOj9`1n
NOTIFYICONDATA data; -_~)f{KN@
data.cbSize=sizeof(NOTIFYICONDATA); jTSOnF}C~+
data.hWnd=GetSafeHwnd(); 5 =Z!hQ}
data.uID=98; =Od>;|]m
Shell_NotifyIcon(NIM_DELETE,&data); tt4+ m>/T
ShowWindow(SW_SHOW); #D)x}#V\
SetForegroundWindow(); R8<eN9bJ9
ShowWindow(SW_SHOWNORMAL); iV
hJH4
bTray=FALSE; .Z%G@X*
} >;nS8{2o
Coa -8j*R7
void CCaptureDlg::OnChange() f=I:DkR
{ ~O4|KY
RegisterHotkey(); ~L4eZ
} D;js.ZF
Ze
?
g
BOOL CCaptureDlg::RegisterHotkey() 0ar=cuDm
{
(ZPXdr
UpdateData(); qtzRCA!9(Z
UCHAR mask=0;
{L0;{
UCHAR key=0; 2p:r`THvS5
if(m_bControl) ;V.vfar
mask|=4; /#t&~E_|
if(m_bAlt) _P5P(^/
mask|=2; 8A{6j
if(m_bShift) 7X'y>\^w^>
mask|=1; .ECHx Dp
key=Key_Table[m_Key.GetCurSel()]; !R:y'Y%j
if(bRegistered){ 2u:4$x8
DeleteHotkey(GetSafeHwnd(),cKey,cMask); -<W2PY<
bRegistered=FALSE; m0( E kK
} ,{{SI
cMask=mask; dr})-R
cKey=key; $']VQ4tZ
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 40K2uT{cq
return bRegistered; =n0*{~r
} -(;LQDG |
MF.[8Zb
四、小结 T;?+kC3
K.DXJ UR
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。