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:
|u?k-,uI9
G:E+s(x 一、实现方法
=2ATqb"$w }M"-5K} 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
w\0Oz?N ,gFL Wb`B' #pragma data_seg("shareddata")
UiGUaB mF* HHOOK hHook =NULL; //钩子句柄
UDIac;vT UINT nHookCount =0; //挂接的程序数目
ZaEBdBv static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
&(z8GYBr static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
^L*VW
gi9 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
,iA2si static int KeyCount =0;
Apw-7*/ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
!5g)3St #pragma data_seg()
0C9QAJa o
m{n"cg 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
?z4uze1 ie$fMBIq 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:
T }8r;<P6 |-cALQ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Y(Z(dV!Po cKey,UCHAR cMask)
"6[Ax{cM {
tZJ
9}\r BOOL bAdded=FALSE;
`Tm8TZd66 for(int index=0;index<MAX_KEY;index++){
?j^?@%f0
if(hCallWnd[index]==0){
T$>=+U hCallWnd[index]=hWnd;
]aL [ HotKey[index]=cKey;
D@YM}HXuj HotKeyMask[index]=cMask;
^q4:zZZ bAdded=TRUE;
eog,EP"a8Y KeyCount++;
9X^-)G> break;
OFPd6,(E }
%]P@G^Bv }
c_DB^M!h return bAdded;
$F
/p8AraK }
WLj_Zo*^x //删除热键
*{4{<O<4 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
wTJMq`sY_ {
'amex BOOL bRemoved=FALSE;
A%sxMA!K, for(int index=0;index<MAX_KEY;index++){
'!|E+P- if(hCallWnd[index]==hWnd){
N;Gf,pE if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
jy)9EU= hCallWnd[index]=NULL;
Y9(i}uTi HotKey[index]=0;
[]]LyWk HotKeyMask[index]=0;
D4x' bRemoved=TRUE;
enfu%"(K) KeyCount--;
:XZJx gx break;
(x*2BEn| }
S+\Mt+o }
\2LA%ZU }
K+aJ`V return bRemoved;
V'|g }
{<V|Gr |GLn
9vw7S d ;Gm {g# DLL中的钩子函数如下:
!C)> {7MgN'4 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
IEKX'+t' {
)~o`QM+ BOOL bProcessed=FALSE;
o@V/37! if(HC_ACTION==nCode)
3By>t!~Q {
:WKyEt!3 if((lParam&0xc0000000)==0xc0000000){// 有键松开
OKNs (H switch(wParam)
0BU:(o& {
qm&53 case VK_MENU:
AXv3jH,HF MaskBits&=~ALTBIT;
Z~R/p;@ break;
:r|P?;t( case VK_CONTROL:
ovRCF(Og, MaskBits&=~CTRLBIT;
dIh(~KqB break;
=GS_ G;Dz case VK_SHIFT:
:~YyHX MaskBits&=~SHIFTBIT;
x+j/v5 break;
,Y/>*,J default: //judge the key and send message
Ra,on&OP`* break;
<zWQ[^ }
mwiPvwHrg for(int index=0;index<MAX_KEY;index++){
ynz5Dy.d; if(hCallWnd[index]==NULL)
R=f5:8D<- continue;
G}OrpPP if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
R5YtCw]i= {
FH@e:-*= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
'aSORVq^e[ bProcessed=TRUE;
Sf8Xj|u }
ToCfLJ?{ }
91'^--N }
%-zH]"Q$ else if((lParam&0xc000ffff)==1){ //有键按下
&5CeRx7% switch(wParam)
Vf2!0 {
1JY90l$ME case VK_MENU:
A}+r;Y8[h MaskBits|=ALTBIT;
(>% Vj break;
t"m`P1 case VK_CONTROL:
%JU23c* MaskBits|=CTRLBIT;
/IR5[67 break;
R}YryzV5 case VK_SHIFT:
"alO"x8t MaskBits|=SHIFTBIT;
5_T>HHR6 break;
Gf$>!zXr default: //judge the key and send message
0>J4O:k break;
CHSD8D }
y")>"8H for(int index=0;index<MAX_KEY;index++){
[<yUq zm if(hCallWnd[index]==NULL)
%Y[/Ucdm continue;
Rf$6}F
if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
w'j]Y% {
}|,\?7, SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
8i~'~/x bProcessed=TRUE;
zTzG&B- }
MA QY/s~F }
/ S^m!{ }
KV(W|~+ rM if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
))zaL2UP. for(int index=0;index<MAX_KEY;index++){
Z@Z`8M@Q, if(hCallWnd[index]==NULL)
~DS9{Y continue;
u01^ABn if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
KAaeaiD SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
~d8o,.n`1 //lParam的意义可看MSDN中WM_KEYDOWN部分
1e%Xyqb }
e/%YruzS }
>sY+Y 22U }
EnAw8Gm* return CallNextHookEx( hHook, nCode, wParam, lParam );
U5s]dUs ( }
*38\&"s4_ zL}DLfy>R 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
ZPog)d@! Jk{2!uP BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
kKO]q#9sO BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
<T9m.:l }e|]G,NZO 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
%^A++Z$` g#NUo/ LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
%ua5T9H Z {
`84yGXLK if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
[#H8Mb+7 {
*Ux"3IXO //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
ywBo9|%T SaveBmp();
X:bgY return FALSE;
Tl-B[CT }
3_:k12%p …… //其它处理及默认处理
h{9pr }
<Z_`^~! u{^Kyo#v Ml
^Tb# 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。
xEqrs6sR P40eK0e6 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。
OC.@C}u
w?"l4.E% 二、编程步骤
^hJ,1{o gE#,QOy 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";
UNHHzTsr? MR: {Ps&, 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
r6<}S( \v_(* 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;
\Ld7fP W@Wh@eSb; 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;
'-_PO|} N\$6R-L 5、 添加代码,编译运行程序。
9 R1]2U$| ~b/>TKn+ 三、程序代码
I_Qnq4Sk( ^TGHWCK!t ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
~heF0C_ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
9yPB)&"EF #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
a6OT2B #if _MSC_VER > 1000
Q)/q h;Ru #pragma once
0v?,:]A0E #endif // _MSC_VER > 1000
TgLlmU*qMU #ifndef __AFXWIN_H__
]Ea6Z #error include 'stdafx.h' before including this file for PCH
<Lt$qV-# #endif
xUUp?]9y #include "resource.h" // main symbols
IYFA>*Es class CHookApp : public CWinApp
{lA@I*_lj {
[%pZM.jFO public:
kW9STN CHookApp();
P!/8 // Overrides
iGIaZ!j aW // ClassWizard generated virtual function overrides
YH9BJ //{{AFX_VIRTUAL(CHookApp)
P'+*d#*S public:
!ibp/:x virtual BOOL InitInstance();
,>Q,0bVhH0 virtual int ExitInstance();
s]qfLC //}}AFX_VIRTUAL
ScD9Ct*):C //{{AFX_MSG(CHookApp)
.6*A~%-=[d // NOTE - the ClassWizard will add and remove member functions here.
ME.LS2'n // DO NOT EDIT what you see in these blocks of generated code !
,3K?=e2 //}}AFX_MSG
Hs9uDGWp DECLARE_MESSAGE_MAP()
F&Gb[Q&a8 };
[,c>-jA5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
QB7<$Bp BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>_o_&;=`v BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
nz(OHh!}u BOOL InitHotkey();
8{RiaF8 BOOL UnInit();
\Z$*8z= #endif
4d#W[ 9M6&+1XE //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
Ugn"w E #include "stdafx.h"
*\/UT #include "hook.h"
cG<?AR?wDT #include <windowsx.h>
})" : F #ifdef _DEBUG
yC
-4wn* #define new DEBUG_NEW
nm)F tX|A #undef THIS_FILE
pJmn;XbME static char THIS_FILE[] = __FILE__;
ReY K5J=O #endif
r`=d4dK- #define MAX_KEY 100
/N$T[ #define CTRLBIT 0x04
V\
|b#?KL #define ALTBIT 0x02
30<^0J.1 #define SHIFTBIT 0x01
\oi=fu=}* #pragma data_seg("shareddata")
g
{00i HHOOK hHook =NULL;
pCq{F*; UINT nHookCount =0;
'F@'4[uda static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
76
y}1aa static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
6wGf47 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
}&=C*5JN static int KeyCount =0;
Zffzyh static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
X0m\
#pragma data_seg()
?vXy7y&4 HINSTANCE hins;
H)5]K9D void VerifyWindow();
WPPmh~: BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
ZY83,:< //{{AFX_MSG_MAP(CHookApp)
YcIk{_N3 // NOTE - the ClassWizard will add and remove mapping macros here.
k]v a // DO NOT EDIT what you see in these blocks of generated code!
?xy~N?N //}}AFX_MSG_MAP
Ij"`pdp END_MESSAGE_MAP()
;&iQNXL 7y:J@fh< CHookApp::CHookApp()
k}/0B {
;lP) // TODO: add construction code here,
]g:VvTJ;? // Place all significant initialization in InitInstance
=!Ok079{[ }
[z?<'Tj _KKG^
u< CHookApp theApp;
eOS#@6U=u LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
'E6)6N {
P!:D2zSH_ BOOL bProcessed=FALSE;
vrH/Z.WD if(HC_ACTION==nCode)
8}4V$b`Z {
ZMbv1*Vt if((lParam&0xc0000000)==0xc0000000){// Key up
@@+\ switch(wParam)
B&"fPi {
@;pTQ
5
I case VK_MENU:
z55P~p MaskBits&=~ALTBIT;
Zx3m$.8 break;
dqcfs/XhP case VK_CONTROL:
d]CRvzW MaskBits&=~CTRLBIT;
gVA$P break;
x#U?~6.6 case VK_SHIFT:
7,Nd[
oL*7 MaskBits&=~SHIFTBIT;
;|66AIwDe break;
<wa}A!fu default: //judge the key and send message
+[:}<^p?cG break;
\
3ha }
CJ?Lv2Td for(int index=0;index<MAX_KEY;index++){
Y!}BmRLh2 if(hCallWnd[index]==NULL)
iYR8sg[' # continue;
5ZUqCl(PX) if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
0Bb amU {
ji:JLvf]% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
FK0nQ{uB" bProcessed=TRUE;
ur"ckuG!9 }
]QRhTz }
X]M)T }
]hc.cj`\W& else if((lParam&0xc000ffff)==1){ //Key down
0fwo8NgX switch(wParam)
&?v^xAr?B {
Jk 0;<2j case VK_MENU:
%\2
ll=p1 MaskBits|=ALTBIT;
UJ2Tj+ break;
P'R!"
# case VK_CONTROL:
[*Wq6n MaskBits|=CTRLBIT;
BNnGtVAbZ break;
uveTx case VK_SHIFT:
RKx"
}<#+ MaskBits|=SHIFTBIT;
&dH/V-te break;
KYZ/b8C default: //judge the key and send message
0PjWfM8% break;
P_
U[OM\ }
I5
"Z for(int index=0;index<MAX_KEY;index++)
vm_+U*%c {
W^Wr if(hCallWnd[index]==NULL)
H_un3x1 continue;
$_onSYWr if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
i]JD::P_H {
<}&n}|! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
Ivmiz{Oii bProcessed=TRUE;
<-D>^p9 }
KY~p>Jmh }
xrs?"]M[ }
4$oNh)+/h if(!bProcessed){
;`p+Vs8C for(int index=0;index<MAX_KEY;index++){
Tu"bbc if(hCallWnd[index]==NULL)
@FKm_q continue;
SxI='z_S.f if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
d="Oge8 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
N =FX3Z }
&`Oj<UyJY }
>hHjDYjbf }
9)9p<(b$ return CallNextHookEx( hHook, nCode, wParam, lParam );
ry)g<OA }
d}2tqPy a P:,' BOOL InitHotkey()
^lud2x$O^C {
SVB> 1s9F if(hHook!=NULL){
FrT.<3 nHookCount++;
<&^P1x<x return TRUE;
094~ s }
TwJiYXHw? else
v'na{" hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
6Lj=%& if(hHook!=NULL)
HI&N&a9C nHookCount++;
LS;j]!CU return (hHook!=NULL);
tUU`R{=( }
ldk (zAB. BOOL UnInit()
@-ps[b`z {
UVa:~c$U4 if(nHookCount>1){
G%5bQ|O nHookCount--;
mUSrC U_} return TRUE;
w{TZN{Y }
u-qwG/$E BOOL unhooked = UnhookWindowsHookEx(hHook);
^F\RM4|, if(unhooked==TRUE){
sT8(f=^)8F nHookCount=0;
w(Jf;[o hHook=NULL;
$.HZz }
Xf
0)i return unhooked;
>2vUFq`H }
0#Ivo<V 3mef;!q BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@2(7
ZxI {
Q+bZZMK5,U BOOL bAdded=FALSE;
>I*)0tE for(int index=0;index<MAX_KEY;index++){
V Ioqn$ if(hCallWnd[index]==0){
c+S<U* hCallWnd[index]=hWnd;
a9LK}xc={ HotKey[index]=cKey;
S:5vC{ HotKeyMask[index]=cMask;
fG dT2}gd bAdded=TRUE;
A$ 2 AYQ KeyCount++;
z3Id8G&> break;
2><=U7~ }
~t=73fwB }
oz8z%*9( return bAdded;
!V.2~V[^M }
Q+<{2oVz <[l0zE5Z8' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
6&9}M Oc {
9N[(f-` BOOL bRemoved=FALSE;
~W/|RP7S for(int index=0;index<MAX_KEY;index++){
t_xO-fT) if(hCallWnd[index]==hWnd){
Th.Mn}1%L if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
Xmb001 hCallWnd[index]=NULL;
6Dl]d%. HotKey[index]=0;
TKH!,Ow9A HotKeyMask[index]=0;
p[LPi5 bRemoved=TRUE;
ioW&0?,Ym KeyCount--;
I@/s&$H`l break;
y@Gl'@-O }
Qr.SPNUFK }
1ze\ U> }
3aY^6& return bRemoved;
0 k(su
}
B0+r faIHmU void VerifyWindow()
PKjM1wqaG@ {
F`Ld
WA for(int i=0;i<MAX_KEY;i++){
L#|6Lnp^ if(hCallWnd
!=NULL){ XG!s+ShFV
if(!IsWindow(hCallWnd)){ dy'
J~Eo7
hCallWnd=NULL; "/kTEp
HotKey=0; dje}CbZ
HotKeyMask=0; a(#aEbN?d
KeyCount--; |Y tZOQu
} Z#vU~1W
} WU+OS(
} bXNM.K
} 4\Q
pS
X,mqQ7+
BOOL CHookApp::InitInstance() ]EWEW*'j
{ dX;Q\
]"
AFX_MANAGE_STATE(AfxGetStaticModuleState()); \- f^C}m
hins=AfxGetInstanceHandle(); (#Ku`
InitHotkey(); "6t#
return CWinApp::InitInstance(); =}K"@5J
} #a+*u?jnnL
"8l&m6`U-
int CHookApp::ExitInstance() "CTK%be{q/
{ +:ih`q][b
VerifyWindow(); Qq{>]5<
UnInit(); g4f:K=5:
return CWinApp::ExitInstance(); CzfGb4
} YIn
H8Ex
MO-7yp:K
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Oe)B.{;Ph
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) x='T`*HD
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X:kr$
#if _MSC_VER > 1000 We)l_>G
#pragma once Iw[7;B5v
#endif // _MSC_VER > 1000 xcM*D3
:G[6c5j|V
class CCaptureDlg : public CDialog c]PG5f xf
{ [4
y7tjar^
// Construction dxi5p!^^9
public: 4apaUP=Jp
BOOL bTray; y*<x@i+h
BOOL bRegistered; s9[547?`
BOOL RegisterHotkey(); &xLCq&j1
UCHAR cKey; k0@*Up3{7
UCHAR cMask; SUN!8
qFA
void DeleteIcon(); 'Da*MGu9
void AddIcon(); N9cCfB\`
UINT nCount; hCpcX"wND
void SaveBmp(); -$sVqR>_
CCaptureDlg(CWnd* pParent = NULL); // standard constructor b]6@
O8
// Dialog Data bmQ-5SE
//{{AFX_DATA(CCaptureDlg) ><wYk)0E
enum { IDD = IDD_CAPTURE_DIALOG }; C
@nA*
CComboBox m_Key; ^_c6Op<F
BOOL m_bControl; Ku`u%5<
BOOL m_bAlt; f)19sjAJk
BOOL m_bShift; k9m9IE"9=$
CString m_Path; b Od<x
>@
CString m_Number; qAW?\*n5N
//}}AFX_DATA hl$X.O
// ClassWizard generated virtual function overrides 952l1c!
//{{AFX_VIRTUAL(CCaptureDlg) y8j6ttQv=t
public: #?C.%kD
virtual BOOL PreTranslateMessage(MSG* pMsg); @@V{W)rl
protected: 9>k_z&<
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @hwe
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); O9ar|8y
//}}AFX_VIRTUAL VRB!u420
// Implementation * zt?y
protected: H>]A|-rG#
HICON m_hIcon; I=2b)"t0
// Generated message map functions <Uc?#;%Y}
//{{AFX_MSG(CCaptureDlg) } fJLY\
virtual BOOL OnInitDialog(); _=_<cgy1u
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~@$RX:p
afx_msg void OnPaint(); F%IvgXt5
afx_msg HCURSOR OnQueryDragIcon(); j;BlpRD}
virtual void OnCancel(); bm poptfL
afx_msg void OnAbout(); hQ (84u
afx_msg void OnBrowse(); M(?0c}z
afx_msg void OnChange(); T^icoX=c4
//}}AFX_MSG Xp[x O 0
DECLARE_MESSAGE_MAP() 2ElZ&(RZJF
}; h+ <Jv
#endif PiN^/#D
qLV3Y?S!L
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 89x;~D1
#include "stdafx.h" \Oxyc}&
#include "Capture.h" 8j)*T9
#include "CaptureDlg.h" I-^C6~
#include <windowsx.h> Y @Ur}
#pragma comment(lib,"hook.lib") 3sD|R{
#ifdef _DEBUG A(*c|Aj9
#define new DEBUG_NEW 66-tNy
#undef THIS_FILE SuXeUiK.[
static char THIS_FILE[] = __FILE__; %j@@J\G!
#endif Ab6R ?mUM
#define IDM_SHELL WM_USER+1 82iFk`)T
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U$46=F|
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); szCB}WY
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G@txX
'
class CAboutDlg : public CDialog wjfq"7Q
{ Iz[ohn!f
public: 1obajN
CAboutDlg(); U C_$5~8p
// Dialog Data A*g-pJh
//{{AFX_DATA(CAboutDlg) adPd}rt;
enum { IDD = IDD_ABOUTBOX }; R.cR:fA
//}}AFX_DATA hr!'
// ClassWizard generated virtual function overrides S=j
pn
//{{AFX_VIRTUAL(CAboutDlg) p-r[M5;-^Q
protected: 1m5*MY
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2;(+]Ad<
//}}AFX_VIRTUAL ^HxIy;EQ<z
// Implementation c]n"1YNm
protected: Nz}PcWF/
//{{AFX_MSG(CAboutDlg) G\o9mEzQ
//}}AFX_MSG T.jCF~%7F
DECLARE_MESSAGE_MAP() o7s!ti\G
}; C57m{RH
K?Sy?Kz
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) OJd/#KFm
{ '/)qI.
//{{AFX_DATA_INIT(CAboutDlg) 0HUylnXf0
//}}AFX_DATA_INIT D*j^f7ab
} skBD2V4
lF_"{dS_6(
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &36SX<vZ
{ Y2;2Exp^
CDialog::DoDataExchange(pDX); 0zE@?.
//{{AFX_DATA_MAP(CAboutDlg) UOk\fyD2[
//}}AFX_DATA_MAP !JyY&D~`
} GGf<9!:
NSBcYObX
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) `<7!Rh,tS^
//{{AFX_MSG_MAP(CAboutDlg) |-)8=QDz)r
// No message handlers AL.psw-Il
//}}AFX_MSG_MAP o+B)
END_MESSAGE_MAP() r fzNw
.r2*tB).
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) L SP p
: CDialog(CCaptureDlg::IDD, pParent) _CfJ Kp)
{ yIrJaS-
//{{AFX_DATA_INIT(CCaptureDlg) IvT><8<G
m_bControl = FALSE;
?C#E_
m_bAlt = FALSE; xM(H4.<
m_bShift = FALSE; Dnl<w<}ZU:
m_Path = _T("c:\\"); 15,JD
m_Number = _T("0 picture captured."); :aK?Dt Z
nCount=0; OQ7 `n<I<)
bRegistered=FALSE; /("7*W 2
bTray=FALSE; M
`^[Y2 c
//}}AFX_DATA_INIT h%krA<G9
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 y TD4![
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); BBRL_6
} wWy;dma#
Vv45w#w;
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X!p`|i
{ qh:Bc$S
CDialog::DoDataExchange(pDX); =o~GLbsER
//{{AFX_DATA_MAP(CCaptureDlg) #3QPcoxa
DDX_Control(pDX, IDC_KEY, m_Key); 0z8?6~M;<
DDX_Check(pDX, IDC_CONTROL, m_bControl); B*,)@h
DDX_Check(pDX, IDC_ALT, m_bAlt); BtZ]~S}v
DDX_Check(pDX, IDC_SHIFT, m_bShift); TK
fN`6
DDX_Text(pDX, IDC_PATH, m_Path);
&cSVOsi
DDX_Text(pDX, IDC_NUMBER, m_Number); !:^q_q4
//}}AFX_DATA_MAP F5Z,Jmi^M
} 6e%@uB}$
80Dn!9j*
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MQQm3VaKS
//{{AFX_MSG_MAP(CCaptureDlg) l6ym <V(1p
ON_WM_SYSCOMMAND() y
%Q. (
ON_WM_PAINT() +cfEyiub
ON_WM_QUERYDRAGICON() qcS.=Cj?)
ON_BN_CLICKED(ID_ABOUT, OnAbout) V0=%$tH
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lL:a}#qxU
ON_BN_CLICKED(ID_CHANGE, OnChange) e@Lxduq
//}}AFX_MSG_MAP x9vSekV
END_MESSAGE_MAP() C/!.VMl^
/ce;-3+
BOOL CCaptureDlg::OnInitDialog() 6OAs%QZ
{ LE\=Y;%
CDialog::OnInitDialog(); }OpUG
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "`$,qvNN
ASSERT(IDM_ABOUTBOX < 0xF000); _&uJE&xl}
CMenu* pSysMenu = GetSystemMenu(FALSE); rD].=.?1
if (pSysMenu != NULL) iT>u&0B-
{ dU$VRgP/
CString strAboutMenu; :V(LBH0
strAboutMenu.LoadString(IDS_ABOUTBOX); fQJ`&9m*BF
if (!strAboutMenu.IsEmpty()) ]YgR
{ H<(F$7Q!\
pSysMenu->AppendMenu(MF_SEPARATOR); cb|+6m~
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); {A/r)
} ;
oyV8P$
} hOY@vm&
SetIcon(m_hIcon, TRUE); // Set big icon b=,BLe\
SetIcon(m_hIcon, FALSE); // Set small icon VJ~D.ec
m_Key.SetCurSel(0); ]n!V
RegisterHotkey(); IZ=Z=k{
CMenu* pMenu=GetSystemMenu(FALSE); Mg;pNK\n
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .a.HaBBV
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CS7b3p!I
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); x>yqEdR=o
return TRUE; // return TRUE unless you set the focus to a control g8<ODU0[g
} ^kKLi
Q@ VA@N=w
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uNN/o}Qx
{ )|~&(+Q?]
if ((nID & 0xFFF0) == IDM_ABOUTBOX) EYT^*1,E*
{ Kh]es,$D
CAboutDlg dlgAbout; I-]G{
dlgAbout.DoModal(); <=4$.2ym
} _3`GZeGV
else .]v>LsbhF
{ >w3C
Ku<
CDialog::OnSysCommand(nID, lParam); yu;EL>G_AY
} h/Mt<5
} <Wn~s=
`% 9Y)a/e
void CCaptureDlg::OnPaint() @]Jq28
{ y\FQt];z)
if (IsIconic()) ht-'O"d:
{ +^AdD8U
CPaintDC dc(this); // device context for painting LIDi0jbrq
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -wn-PB@r
// Center icon in client rectangle T9yI%;D
int cxIcon = GetSystemMetrics(SM_CXICON); -'&l!23a~
int cyIcon = GetSystemMetrics(SM_CYICON); mB`HPT
CRect rect; vPnS`&
GetClientRect(&rect); 1uo-?k
int x = (rect.Width() - cxIcon + 1) / 2; !X}+JeU'
int y = (rect.Height() - cyIcon + 1) / 2; H:G``Vq;0m
// Draw the icon u>'0Xo9R
dc.DrawIcon(x, y, m_hIcon); hC$e8t60
} [vu;B4^"
else ]9QXQH
{ =c6d$
CDialog::OnPaint(); ]-wyZ +a
} !!.@F;]W
} [r2V+b.C
94!}
Z>
HCURSOR CCaptureDlg::OnQueryDragIcon() 3cJ'tRsp<
{ zw3I(_d[
return (HCURSOR) m_hIcon;
nS]e
} xhALJfv
%s}{5Qcl/
void CCaptureDlg::OnCancel() *L<EGFP
{ &&;.7E
if(bTray) V dJ
DeleteIcon(); |21VOPBS
CDialog::OnCancel(); ftn10TO *
} P*k n}:
2 4od74\
void CCaptureDlg::OnAbout() U/Cc!WXV]
{ b0}dy\dnQ
CAboutDlg dlg; >JNdtP8s/1
dlg.DoModal(); @CM5e!
} I?1BGaAA
C#[P<= v
void CCaptureDlg::OnBrowse() q>+!Ete1p
{ V1,p<>9
CString str; 1TEKq#t;y
BROWSEINFO bi; )W_akUL
char name[MAX_PATH]; wKJ|;o4;L
ZeroMemory(&bi,sizeof(BROWSEINFO)); .8'c
c8
bi.hwndOwner=GetSafeHwnd(); xsU%?"r
bi.pszDisplayName=name; TQ![
bi.lpszTitle="Select folder"; Swf%WuDj
bi.ulFlags=BIF_RETURNONLYFSDIRS; WXo bh
LPITEMIDLIST idl=SHBrowseForFolder(&bi); P*[wB_^&UP
if(idl==NULL) Ro{xprE1
return; y.(<
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :/gHqEC24
str.ReleaseBuffer(); (-J'x%2)
m_Path=str; *|q{(KX
if(str.GetAt(str.GetLength()-1)!='\\') p! k~ufU
m_Path+="\\"; I@qGDKz;
UpdateData(FALSE); }x#e.}hf&
} ,n%b~.$:v5
\>9^(N
void CCaptureDlg::SaveBmp() 'PrBa[%
{ s3sD7 @
CDC dc; W2%@}IDm
dc.CreateDC("DISPLAY",NULL,NULL,NULL); X!{K`~DRX
CBitmap bm; `
,SNq i
int Width=GetSystemMetrics(SM_CXSCREEN); Cj }H'k<B
int Height=GetSystemMetrics(SM_CYSCREEN); tYgHJ~1L*
bm.CreateCompatibleBitmap(&dc,Width,Height); o/&K>]8M
CDC tdc; -G7)Y:
tdc.CreateCompatibleDC(&dc); 1.N2!:&G|
CBitmap*pOld=tdc.SelectObject(&bm); T++q.oFc
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 48S
NI
tdc.SelectObject(pOld); /V cbT >=
BITMAP btm; 2&pE
bm.GetBitmap(&btm); mcidA%
DWORD size=btm.bmWidthBytes*btm.bmHeight; b+gu<##
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p,f$9t4
BITMAPINFOHEADER bih; J8@.qC'!
bih.biBitCount=btm.bmBitsPixel; MtF^}/0w!`
bih.biClrImportant=0; a>-qHX-l
bih.biClrUsed=0; FjizPg/|!
bih.biCompression=0; y8C8~ -&OK
bih.biHeight=btm.bmHeight; ~K5A$s2
bih.biPlanes=1; M/lC&F(
bih.biSize=sizeof(BITMAPINFOHEADER); !?).4yr
bih.biSizeImage=size; ? [5>!
bih.biWidth=btm.bmWidth; RX_f[
bih.biXPelsPerMeter=0; p(="73
bih.biYPelsPerMeter=0; 6WIs*$T2*
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \ntUxPox.
static int filecount=0; PJ&L7
CString name; \M|:EG%
name.Format("pict%04d.bmp",filecount++); Tb;,t=;u
name=m_Path+name; D
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BITMAPFILEHEADER bfh; BHU$QX
bfh.bfReserved1=bfh.bfReserved2=0; br TP}A
bfh.bfType=((WORD)('M'<< 8)|'B'); j+dQI_']x
bfh.bfSize=54+size; ]
>w@@A
bfh.bfOffBits=54; ,uNJz -B8
CFile bf; m]}U!XT
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ IsJx5GO
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G,B4=[Y
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Fv)E:PnKC
bf.WriteHuge(lpData,size); 9LBZMQ
bf.Close(); 01&E.A
nCount++; |N)),/R_
} fE)o-q6Z
GlobalFreePtr(lpData); |&
jrU-(
if(nCount==1) ]jiVe_ OS<
m_Number.Format("%d picture captured.",nCount); yH43Yo#Rk
else !J!&JQ|
m_Number.Format("%d pictures captured.",nCount); \/\w|j
UpdateData(FALSE); KZcmNli&A
} nN-S5?X#
a]%sks
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3iX\):4
{ 2P^qZDG 8I
if(pMsg -> message == WM_KEYDOWN) ZvT>A#R;l~
{ P,3w
b
if(pMsg -> wParam == VK_ESCAPE) )cP)HbOd=
return TRUE; Y.tT#J^=
if(pMsg -> wParam == VK_RETURN) uPYH3<
return TRUE; [.Kp/,JY
} UuF(n$B
return CDialog::PreTranslateMessage(pMsg); u-:3C<&>
} PXJ7Ek*/
kQ lwl9
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [Y@>,B!V
{ :{lP9%J-
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1(:!6PY
SaveBmp(); [2Nux0g
return FALSE; y@LiUe5
} _'L16@q
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v3XM-+Z4
CMenu pop; mb1c9
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); f^u-Myk
CMenu*pMenu=pop.GetSubMenu(0); R)\^*tkz7
pMenu->SetDefaultItem(ID_EXITICON); 6'@ {
*
u
CPoint pt; 3/Z>W|w#w
GetCursorPos(&pt); 'x"(OdM:[
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Sx e6&
if(id==ID_EXITICON) %-.;sO=g
DeleteIcon(); kL0K[O
else if(id==ID_EXIT) YC56]Zp
OnCancel(); iQ2j ejd3(
return FALSE; blIMrP%
} SUUN_w~
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Rc1k_fZ}
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Q3&q%n|<
AddIcon(); r-.@MbBm
return res; 324XoMO
} C}Kl!
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void CCaptureDlg::AddIcon() GbL1<P$V
{ 3+h3?
NOTIFYICONDATA data; Z
f\~Cl
data.cbSize=sizeof(NOTIFYICONDATA); ]SRpMZ
CString tip; foQo`}"5
tip.LoadString(IDS_ICONTIP); urjf3h[%
data.hIcon=GetIcon(0); DR:$urU$
data.hWnd=GetSafeHwnd(); 5h6o}
strcpy(data.szTip,tip); 23>[-XZb[O
data.uCallbackMessage=IDM_SHELL; Q-gVg%'7
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xHJkzI
data.uID=98; F!0iM)1o
Shell_NotifyIcon(NIM_ADD,&data); ]FTi2B{}H
ShowWindow(SW_HIDE); <]LljTm`i
bTray=TRUE; @CL#B98jl
} Q
zaD\^OF
.\^0RyJE
void CCaptureDlg::DeleteIcon() A&~fw^HM
{ I_u/
NOTIFYICONDATA data; oYStf5
data.cbSize=sizeof(NOTIFYICONDATA); y@!o&,,mq
data.hWnd=GetSafeHwnd(); '"\M`G
data.uID=98; &.*UVc2+Y
Shell_NotifyIcon(NIM_DELETE,&data); tULGfvp
ShowWindow(SW_SHOW); cpltTJFg
SetForegroundWindow(); TI<
x;p
ShowWindow(SW_SHOWNORMAL); PLc5m5
bTray=FALSE; i!?gga
} "}fweCBgo
~&73f7
void CCaptureDlg::OnChange() FHSoj=
{ _f^KP@^j
RegisterHotkey(); SE]5cJ'>
} 8v& \F
qM(}|fMbN
BOOL CCaptureDlg::RegisterHotkey() +hmFFQQ}
{ ZLv/otf:|"
UpdateData(); \7/yWd{N$
UCHAR mask=0; <s'de$[
UCHAR key=0; n_e'n|T
if(m_bControl) @ivd|*?k0
mask|=4; XZM3zlg*
if(m_bAlt) :-k|jt
mask|=2; .9qK88fU R
if(m_bShift) [s{!
mask|=1; G:1'}RC :
key=Key_Table[m_Key.GetCurSel()]; ;[sW\Ou
if(bRegistered){ `um,S
DeleteHotkey(GetSafeHwnd(),cKey,cMask); Bvn3:+(47
bRegistered=FALSE; )S)L9('IxT
} 3`HK^((o
cMask=mask; ~.m<`~u
cKey=key; C|$qVh>
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !LI<%P)
return bRegistered; d!y*z
} .gRj^pu
>d 2Fa4u3
四、小结 `a& kD|Yh
>M,oyM"s
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。