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:
'mTQ=1
U8a5rF>< 一、实现方法
MG,)|XpyWJ \OwCZ!`7i 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:
O>eg_K,c AD~_n^ #pragma data_seg("shareddata")
6F_:,b^ HHOOK hHook =NULL; //钩子句柄
~7wLnB UINT nHookCount =0; //挂接的程序数目
'<U4D static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
3Mq%3jX static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
I23"DBR3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
XzBlT( `w static int KeyCount =0;
wpD}#LRfm static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
T>|Y_3YO_a #pragma data_seg()
i3cMRcS; nG%<n 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。
'=(D7F; [QIQpBL 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:
\A6}= (
6ucA BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
XUA%3Xr cKey,UCHAR cMask)
aTkMg {
n72kJ3u. BOOL bAdded=FALSE;
b3ys"Vyn for(int index=0;index<MAX_KEY;index++){
_zkTx7H if(hCallWnd[index]==0){
|Yv,zEY) hCallWnd[index]=hWnd;
:`c@&WF8 HotKey[index]=cKey;
S0ReT*I HotKeyMask[index]=cMask;
=
toU?:. bAdded=TRUE;
z'*{V\ KeyCount++;
4 ]ko break;
vGOO"r(xL }
ANfy+@ }
/]of@
return bAdded;
`/9I` <y }
%r&36d' //删除热键
v3(0Mu0J BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Zy|u5J {
h
gu\~}kD BOOL bRemoved=FALSE;
|v<4=/. for(int index=0;index<MAX_KEY;index++){
R+2~%|{d if(hCallWnd[index]==hWnd){
Y~w1_>b if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+:W? :\ hCallWnd[index]=NULL;
g`~;"%u7cn HotKey[index]=0;
5=Y(.}6 HotKeyMask[index]=0;
g?K? Fn.} bRemoved=TRUE;
~6+Um_A_L KeyCount--;
c=^69>w break;
t^}"8 }
$.31<@T7 }
DiZ;FHnaG? }
$`R=Q return bRemoved;
d[*NDMO }
Vt-V'`Y rv<qze;?| RRzLQ7J DLL中的钩子函数如下:
WI.+9$1:P +UX}
"m~W LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
Yv2L0bUo: {
h 0)oQrY BOOL bProcessed=FALSE;
:9(w~bB9$ if(HC_ACTION==nCode)
8#4Gs Q" {
]7RK/Zu i if((lParam&0xc0000000)==0xc0000000){// 有键松开
7M_GGjP switch(wParam)
#-{ljjMQI {
(a~V<v" case VK_MENU:
yVJ)JhV MaskBits&=~ALTBIT;
Mko,((>I1 break;
75A60Uw case VK_CONTROL:
VTi;y{ MaskBits&=~CTRLBIT;
xsrdHP1 break;
A2Iqn5 case VK_SHIFT:
AboRuHQ MaskBits&=~SHIFTBIT;
z5sKV7&\[n break;
%WYveY default: //judge the key and send message
FY]Et=p break;
Yi19VU|/ }
n:Dr< q. for(int index=0;index<MAX_KEY;index++){
k\ZU%"^J if(hCallWnd[index]==NULL)
JqEo~]E] continue;
lg
1r] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
qVds
2 {
$us7fuKE SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
HLh]*tQG bProcessed=TRUE;
nrM-\' }
} OkK@8?0O }
*4l6+#W }
B;Co`o2 else if((lParam&0xc000ffff)==1){ //有键按下
2}5@:cwR+ switch(wParam)
]_4HtcL4 {
|lVi* 4za% case VK_MENU:
mrlhj8W?! MaskBits|=ALTBIT;
G52z5-=v break;
*C^TCyBK; case VK_CONTROL:
;]2d%Qt MaskBits|=CTRLBIT;
#jw%0H;l] break;
''.\DC~K case VK_SHIFT:
U^OR\=G^ MaskBits|=SHIFTBIT;
Wix4se1Ac break;
{%X[Snv default: //judge the key and send message
DF"*[]^[ break;
:n oZ
p:a }
8`q"] BQN for(int index=0;index<MAX_KEY;index++){
*(nu0 if(hCallWnd[index]==NULL)
@u8kNXT;h continue;
W1O Y}2kj if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"T6s;'k {
e:6mz\J SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
l D]?9K29 bProcessed=TRUE;
w#;y }
* YTv" }
[uu<aRAg3O }
2%j"E{J& if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
aOW$H:b for(int index=0;index<MAX_KEY;index++){
<J!?eH9f if(hCallWnd[index]==NULL)
u:\DqdlU` continue;
SCXtBZ`.G if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
|f+fG=a67V SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
6am<V]Hw0F //lParam的意义可看MSDN中WM_KEYDOWN部分
FdMTc(> }
Rhh.fV3 }
6/L34VH }
lmB+S return CallNextHookEx( hHook, nCode, wParam, lParam );
?,*KA Gg% }
w'P!<JaZ ?uqPye1fc 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:
o,=dm@j Q E*`#r#e BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
b'G!)n BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
o$,e#q)8 SR {KL#NC 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
wRj&k(?* CWM_J9f LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Z=>#|pW,) {
lag%}^ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
bJ9K!6s??` {
UWq[K&vQZ
//lParam表示是按下还是松开,如果有多个热键,由wParam来区分
b)@b63P_ SaveBmp();
:HDU\|{^ return FALSE;
M\dZxhQ-l }
R3@$ao …… //其它处理及默认处理
$qh?$a }
e'1}5Ky uOprA`3 44(l1xEN+ 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。
hha^:, ".T&nS[z 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。
JO"-"&> SFx|9$hXm 二、编程步骤
*S=zJyAO WEFvJ0] 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
W=@]YI ~V<imF 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
bClMM "] 0sR 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
x7l3&;yDv ;;g'C*_ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
~]&,v|g& Km9Y_`? 5、 添加代码,编译运行程序。
KZ;Q7 1 P(#by{s 三、程序代码
K}p!W"!o {(,[ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
:RE.m d #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
B1!b@0^ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
O>j_x W]V #if _MSC_VER > 1000
T2^0Q9E? #pragma once
ni$S@0 #endif // _MSC_VER > 1000
( d2|r)O #ifndef __AFXWIN_H__
Q(\U'|%J #error include 'stdafx.h' before including this file for PCH
|nFg"W #endif
bEJz>oyW" #include "resource.h" // main symbols
v8>?,N# class CHookApp : public CWinApp
u'BuZF
{
gI SP . public:
8- U1Y
CHookApp();
8;C_@ // Overrides
~K-c-Zs#z // ClassWizard generated virtual function overrides
1dy>a=W //{{AFX_VIRTUAL(CHookApp)
?!:$Z4G public:
e)WpqaI virtual BOOL InitInstance();
?/@~d virtual int ExitInstance();
3k J8Wn //}}AFX_VIRTUAL
:q
xd])- //{{AFX_MSG(CHookApp)
?x|8"*N // NOTE - the ClassWizard will add and remove member functions here.
Gqz<;y // DO NOT EDIT what you see in these blocks of generated code !
g0P^O@8 //}}AFX_MSG
>Bj+!)96q DECLARE_MESSAGE_MAP()
?5A!/`E&% };
gdu8O!9) LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
LvsNU0x BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
Ez*9*]O*+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
0
s-IW BOOL InitHotkey();
GtC bzNY BOOL UnInit();
Jv|uI1V #endif
ZZ<uiN$ nty^De% //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
dc.o K4G} #include "stdafx.h"
aIrQ=} #include "hook.h"
Q]Ymv:M, #include <windowsx.h>
PhHBmMGL #ifdef _DEBUG
*nv%~t #define new DEBUG_NEW
GWNLET #undef THIS_FILE
Vt {uG static char THIS_FILE[] = __FILE__;
zHI_U\"8D #endif
wF +9Iu #define MAX_KEY 100
u7_IO #define CTRLBIT 0x04
c~@Z #define ALTBIT 0x02
/AJ#ngXz #define SHIFTBIT 0x01
$*035f #pragma data_seg("shareddata")
J33enQd HHOOK hHook =NULL;
+:hZ,G?> UINT nHookCount =0;
(vq0Gl static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
tevB2'3^ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
W6_~.m"b static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
p;[">[" static int KeyCount =0;
Qi
3di static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
#kO.'oIl #pragma data_seg()
_Eus<c HINSTANCE hins;
[Yo3=(7J void VerifyWindow();
6qW/Td|g BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
b51{sL //{{AFX_MSG_MAP(CHookApp)
DAZzc :1Aj // NOTE - the ClassWizard will add and remove mapping macros here.
V/X4WZs|i // DO NOT EDIT what you see in these blocks of generated code!
^6tcB* #A //}}AFX_MSG_MAP
Fap@cW3?8 END_MESSAGE_MAP()
aR3R,6ec |T!^&t CHookApp::CHookApp()
^Z?X\t {
Y<~Nx~w{ // TODO: add construction code here,
WD wW` // Place all significant initialization in InitInstance
+Dg%ec }
D}n&`^1X+ >C6wm^bl CHookApp theApp;
~i`@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
oV4+w_rrLc {
JfJUOaL BOOL bProcessed=FALSE;
2_^{Vez@I if(HC_ACTION==nCode)
HPc7Vo( {
$
O1w6\}_ if((lParam&0xc0000000)==0xc0000000){// Key up
6kW <i,A
- switch(wParam)
3j{VpacZY {
VieX5 case VK_MENU:
W$&kOdD!$ MaskBits&=~ALTBIT;
8.Q;o+NU break;
TW2OT } case VK_CONTROL:
"AN2K MaskBits&=~CTRLBIT;
wzX
1!? break;
SU0K#: case VK_SHIFT:
@agW{%R:. MaskBits&=~SHIFTBIT;
:D-xa!7 break;
V^O
dTM default: //judge the key and send message
aGK =VN}r break;
I]qml2 }
C$X
)I~M for(int index=0;index<MAX_KEY;index++){
[4)q6N5`f if(hCallWnd[index]==NULL)
R[eQ}7;+ continue;
Da#|}m0> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>>lT-w {
;p~ &G"-C` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
hZ0p /Bdv bProcessed=TRUE;
,vBi)H }
?b',kN,( }
P0m;AqS#R }
>n,RBl else if((lParam&0xc000ffff)==1){ //Key down
5t6!K?} switch(wParam)
(bfHxkR. {
RX",Zt$q case VK_MENU:
8l|v#^v MaskBits|=ALTBIT;
ygm4A j> break;
.lMIJN&/ case VK_CONTROL:
F(E3U'G MaskBits|=CTRLBIT;
8fpaY{] break;
@;>TmLs case VK_SHIFT:
5TlPs_o MaskBits|=SHIFTBIT;
}{*((@GY} break;
8" Z!: =A default: //judge the key and send message
#pJ^w>YNy break;
m
ys5B} }
<Sn5ME<* for(int index=0;index<MAX_KEY;index++)
RYMOLX84 {
4kO[|~# if(hCallWnd[index]==NULL)
B 95}_q continue;
Y7R"~IA$ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
(;=:QjaoZ {
|Ia3b VW SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
pfW0)V1t bProcessed=TRUE;
>8;Co]::kx }
't=\YFQ*v }
M-KjRl }
rkA0v-N6v if(!bProcessed){
}Jt( H for(int index=0;index<MAX_KEY;index++){
qPdNI1 | if(hCallWnd[index]==NULL)
_xign 3 continue;
}~dXz?{p8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
42LlR
0 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
+M%i3A }
lpkg(J#& }
*zX*k7LnV }
ann!"s_ return CallNextHookEx( hHook, nCode, wParam, lParam );
/=4P<&J }
+]Of f^s W5?F?Dp!v BOOL InitHotkey()
k;:v~7VF {
$DC*&hqpt if(hHook!=NULL){
PPT"?lt*& nHookCount++;
}.|\<8_ return TRUE;
7\d{F)7E }
WM BntB else
4*OL^\% hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
OxX{[|!` if(hHook!=NULL)
%*P59% nHookCount++;
YKLh$ return (hHook!=NULL);
,.tT9?
m }
"s2?cQv{# BOOL UnInit()
ed*Cx~rT {
Ld? tVi if(nHookCount>1){
rq9{m( nHookCount--;
{6)fZpd)@ return TRUE;
^4]#Ri=U }
qAm$yfYs` BOOL unhooked = UnhookWindowsHookEx(hHook);
@/yRE^c if(unhooked==TRUE){
j11 \t nHookCount=0;
Pca~V>Hd hHook=NULL;
nWN~G }
_3tHzDSG# return unhooked;
QRdNi1&M }
j>eL&.d }p}i_'% BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
rui}a=rs {
2ko7t9y& BOOL bAdded=FALSE;
Nv*x^y] for(int index=0;index<MAX_KEY;index++){
"$+naY{w if(hCallWnd[index]==0){
EG&^;uU hCallWnd[index]=hWnd;
YS?P A# HotKey[index]=cKey;
9 f-T>} HotKeyMask[index]=cMask;
8_>\A=
E
bAdded=TRUE;
{d}-SoxH KeyCount++;
52m^jT Sx break;
ixBM>mRK }
WRh&4[G' }
yr&oJYM return bAdded;
yZK1bnYG|I }
jCW>=1:JGY i0-!! BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Qat%<;P2 {
98Srn63O BOOL bRemoved=FALSE;
Ms1G&NYP for(int index=0;index<MAX_KEY;index++){
#H
O\I7m if(hCallWnd[index]==hWnd){
<ofXNv;` if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kjaz{&P hCallWnd[index]=NULL;
.~v~~VL1NS HotKey[index]=0;
P(X#w HotKeyMask[index]=0;
*Q!b%DIa$ bRemoved=TRUE;
t
vk^L3=< KeyCount--;
Da-F(^E break;
,z1# |Y }
%T'?7^\> }
*!Am6\+ }
O b8[P= return bRemoved;
JTx}{kVO }
)V@qH] q{U -kuui void VerifyWindow()
!ox &` {
(R6ZoBZ for(int i=0;i<MAX_KEY;i++){
Efp=z=E if(hCallWnd
!=NULL){ n:*+pL;
if(!IsWindow(hCallWnd)){ @b>]q$)(}
hCallWnd=NULL; ="A[*:hC"
HotKey=0; uFok'3!g7%
HotKeyMask=0; s|,]Nb=z/
KeyCount--; 3\4Cg()
} `/ HygC6
} fLD9RZ8_
} dt5gQ9(B
} QlXy9-oJ"
&McmA
BOOL CHookApp::InitInstance() jV<LmVcZY
{ N$y4>g
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]$L[3qA.
hins=AfxGetInstanceHandle(); 26Yg?:kP
InitHotkey(); qnA:[H;F
return CWinApp::InitInstance(); -"cN9RF
} Fx@
{]
*jJ62-o
int CHookApp::ExitInstance() }!d}febk_
{ \O0fo^+U,,
VerifyWindow(); 4/h2_
UnInit(); AH7k|6ku<*
return CWinApp::ExitInstance(); )F~_KD)7jJ
} ex|kD*=
`j(+Y
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :rj78_e9
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]u,~/Gy
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ UP`q6]P
#if _MSC_VER > 1000 {jVFlKP>
#pragma once )s8r(.W
#endif // _MSC_VER > 1000 j~{2fd<>
roA1=G\Q
class CCaptureDlg : public CDialog Ax%BnkU
{ <- ?B#
// Construction _qg6(
X
public: }ot _k-
BOOL bTray; nx4aGS"F:
BOOL bRegistered; @Dy.HQ~
BOOL RegisterHotkey(); Cb6MD
UCHAR cKey; &8pXkD#A
UCHAR cMask; {eXYl[7n
void DeleteIcon(); k$c
j|-<
void AddIcon(); y#0w\/<
UINT nCount; Z]Y4NO;
void SaveBmp(); ^55?VQB
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ["F,|e{y$
// Dialog Data ETOc4hMO
//{{AFX_DATA(CCaptureDlg) eqR#`
enum { IDD = IDD_CAPTURE_DIALOG }; X{
=[q|P
CComboBox m_Key; ]Yg EnZ
BOOL m_bControl; bw\=F_>L
BOOL m_bAlt; X2[cR;;'
BOOL m_bShift; a,~P_B|@
CString m_Path; 3\+p1f4
CString m_Number; ^0Q*o1W
//}}AFX_DATA %?hLo8
// ClassWizard generated virtual function overrides X t =bc
//{{AFX_VIRTUAL(CCaptureDlg) [QbXj0en$
public: H Im,
"iYk
virtual BOOL PreTranslateMessage(MSG* pMsg); f'O vG@
protected: 5$U>M
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3+3m`%G
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A=UIN!
//}}AFX_VIRTUAL &|}IBu :T
// Implementation 3|Sy'J0'K
protected: `HG19_Z
HICON m_hIcon; V1)P=?%(US
// Generated message map functions *"FLkC4
//{{AFX_MSG(CCaptureDlg) WV1 Z
virtual BOOL OnInitDialog(); &hN&nH"PC
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1lyOp
afx_msg void OnPaint(); +esNwz_
afx_msg HCURSOR OnQueryDragIcon(); 9jGuelwN
virtual void OnCancel(); ll\^9
4]Q
afx_msg void OnAbout(); 4c[)}8\
afx_msg void OnBrowse(); @:+n6
afx_msg void OnChange(); ef}E.Bl
//}}AFX_MSG $;uWj|
DECLARE_MESSAGE_MAP() ^[}0&_L
w
}; U@J/
#endif 8o7]XZE=)
$dTfvd
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j22#Bw
#include "stdafx.h" Uc_`Eh3y
#include "Capture.h" b^,Mw8KsO
#include "CaptureDlg.h" `)=A!x y
#include <windowsx.h> Dg>'5`&
#pragma comment(lib,"hook.lib") 9MB\z"b?A
#ifdef _DEBUG %rDmW?T
#define new DEBUG_NEW q"+ q
#undef THIS_FILE qSoBj&6y
static char THIS_FILE[] = __FILE__; foz5D9sQ
#endif ,/?%y\:J
#define IDM_SHELL WM_USER+1 &AQ;ze
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1R2o6`_
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I#S~
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >2lAy:B5
class CAboutDlg : public CDialog "6E1W,|{
{
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public: :!I)r$
CAboutDlg(); yL;o{
G
// Dialog Data rKzv8d
//{{AFX_DATA(CAboutDlg) fXu~69_
enum { IDD = IDD_ABOUTBOX }; 7O8V1Tt
//}}AFX_DATA xH"W}-#[
// ClassWizard generated virtual function overrides }RA3$%3
//{{AFX_VIRTUAL(CAboutDlg) O^X[9vrW
protected: R0Ax$Cv{
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t,=@hs
hN
//}}AFX_VIRTUAL t<!+b@l5
// Implementation ~T>jBYI0
protected: <\1}@?NGC
//{{AFX_MSG(CAboutDlg) $[M}K
//}}AFX_MSG H
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DECLARE_MESSAGE_MAP() "pSH!0Ap\
}; c&7Do}
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^%n124
{ #&^ZQs<
//{{AFX_DATA_INIT(CAboutDlg) WF ?/GN
//}}AFX_DATA_INIT 6}VUD
-}B
} Z:#.;wA
v}7@CP]nV
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,U6*kvHS6
{ {PN:bb
CDialog::DoDataExchange(pDX); `fQM
//{{AFX_DATA_MAP(CAboutDlg) 'R^iKNPs
//}}AFX_DATA_MAP Bz~ -2#l
} wqJ*%
~?FK ; (
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7d3'CQQ4
//{{AFX_MSG_MAP(CAboutDlg) iKg75%;t
// No message handlers ^F>4~68d
//}}AFX_MSG_MAP (N,nux(0k
END_MESSAGE_MAP() ^4+r*YvcM
5B}3GBA
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,/~[S
: CDialog(CCaptureDlg::IDD, pParent) aQ&uC )w
{ ;!'qtw"CB
//{{AFX_DATA_INIT(CCaptureDlg) g<fP:/
m_bControl = FALSE; hO#HvW
m_bAlt = FALSE; mRCHrw?WG
m_bShift = FALSE; |-|jf
m_Path = _T("c:\\"); Z*9L'd"D|
m_Number = _T("0 picture captured."); *]5z^>
q;7
nCount=0; ~
9=27p
bRegistered=FALSE; for{
bTray=FALSE; LaDY`u0G%
//}}AFX_DATA_INIT 26M~<Ic
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 M^uU4My
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JfkTw~'R
} jA,|JgN|n
9[kX/#~W*
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )`<6taKx@n
{ NS Np
CDialog::DoDataExchange(pDX); t~ -J %$
//{{AFX_DATA_MAP(CCaptureDlg) r
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DDX_Control(pDX, IDC_KEY, m_Key); P])L8zK
DDX_Check(pDX, IDC_CONTROL, m_bControl); Pw= 3PvkL
DDX_Check(pDX, IDC_ALT, m_bAlt); l]$40 j
DDX_Check(pDX, IDC_SHIFT, m_bShift); b"t")U==
DDX_Text(pDX, IDC_PATH, m_Path); r
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DDX_Text(pDX, IDC_NUMBER, m_Number); 847 R
//}}AFX_DATA_MAP Q3,=~}ZNK
} OTE<x"=h
O^0"
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gH'_ymT=
3
//{{AFX_MSG_MAP(CCaptureDlg) 0V3gKd7
ON_WM_SYSCOMMAND() E+z18Lf?
ON_WM_PAINT() lBmm(<~Z
ON_WM_QUERYDRAGICON() Mn@$;\:
ON_BN_CLICKED(ID_ABOUT, OnAbout) 5>P7]?U.]
ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
,gmH2.
ON_BN_CLICKED(ID_CHANGE, OnChange) 7@IFp~6<qK
//}}AFX_MSG_MAP H_Os4}
END_MESSAGE_MAP() 87<9V.s2
O3Uh+gKQ
BOOL CCaptureDlg::OnInitDialog() 7 2,"Cj
{ B+Z13;}B
CDialog::OnInitDialog(); [4XC#OgA
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O:^'x*}
ASSERT(IDM_ABOUTBOX < 0xF000); xnbsg!`;7W
CMenu* pSysMenu = GetSystemMenu(FALSE); ue6d~8&
if (pSysMenu != NULL) 8;#AO8+U7)
{ /.P9MSz0G
CString strAboutMenu; ^i'y6J
strAboutMenu.LoadString(IDS_ABOUTBOX); *QH[,F`I
if (!strAboutMenu.IsEmpty()) (ua q<Cvg
{ @o#+5P
pSysMenu->AppendMenu(MF_SEPARATOR); 5+K;_)
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L2fVLKH
} w!`Umll2
} ^VI,C|
SetIcon(m_hIcon, TRUE); // Set big icon ooE{V*Ie
SetIcon(m_hIcon, FALSE); // Set small icon QU/3X 1W
m_Key.SetCurSel(0); ^u)rB<#BR
RegisterHotkey(); Y)M8zi>b
CMenu* pMenu=GetSystemMenu(FALSE); 2a `J%A
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); VT=K"`EpQ
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hNbIpi=
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S&?7K-F>_o
return TRUE; // return TRUE unless you set the focus to a control zOGR+Gq_Z
} w`gyE
6A
_%Z P{5D>
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Qhy#r
{ ssl&5AS
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;h~er6&
{ 6D/ '`
CAboutDlg dlgAbout; 8Xn!Kpa
dlgAbout.DoModal(); 6G_<2bO
} Q2s&L]L=
else -9o{vmB{
{ S%l:kKD
CDialog::OnSysCommand(nID, lParam); AyVrk
8G
} 5=Lq=,K$
} CMl~=[foW
z"379b7cN
void CCaptureDlg::OnPaint() '*R%^RK
{ pbn\9C/
if (IsIconic()) !buz<h
{ CAgaEJhX3
CPaintDC dc(this); // device context for painting 3&*'6D
Tg
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); %Q4i%:Qi
// Center icon in client rectangle |y1;&<
int cxIcon = GetSystemMetrics(SM_CXICON); rK|*hcy
int cyIcon = GetSystemMetrics(SM_CYICON);
CL3xg)x6
CRect rect; BHr|.9g]%%
GetClientRect(&rect); ^^}Hs-{T
int x = (rect.Width() - cxIcon + 1) / 2; +m/,,+4
int y = (rect.Height() - cyIcon + 1) / 2; 4/*q0M{}B
// Draw the icon geGeZ5+B
dc.DrawIcon(x, y, m_hIcon); Ade}g'
} .j?kEN?w
else TV:<TR
{ LWmB,
Zf/
CDialog::OnPaint(); F
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} 2\@Z5m3B
} A3R#z]Ub
m*n5zi|O
HCURSOR CCaptureDlg::OnQueryDragIcon() [1(FgyE
{ aj8Rb&
return (HCURSOR) m_hIcon; jk70u[\
} DxS sg
h9CIZU[Nh
void CCaptureDlg::OnCancel() s3
B'>RG}
{ n WaNT-
if(bTray) 8r:M*25
DeleteIcon(); O4|2|sA
CDialog::OnCancel(); .<&s%{EW
} k`VM2+9h'^
u, kU$
void CCaptureDlg::OnAbout() Q{y{rC2P
{ 5<R%H{3j
CAboutDlg dlg; #kcSQ'
dlg.DoModal(); zx%X~U
} \3zj18(@8!
r<R4
1Fz
void CCaptureDlg::OnBrowse() cxP&^,~
{ q]c5MlJXF
CString str; )D@~|j:
BROWSEINFO bi; Xu} U{x>
char name[MAX_PATH]; ^DAu5 |--R
ZeroMemory(&bi,sizeof(BROWSEINFO)); W>-B [5O&[
bi.hwndOwner=GetSafeHwnd(); WlVl[/qt
bi.pszDisplayName=name; nzsl@1s
bi.lpszTitle="Select folder"; eV!L^>>>
bi.ulFlags=BIF_RETURNONLYFSDIRS; q{' ~+Nq
LPITEMIDLIST idl=SHBrowseForFolder(&bi); WZewPn>#q
if(idl==NULL) $:bih4@>
return; :#{Xuy:
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k&6I f0i
str.ReleaseBuffer(); ^twivNB
m_Path=str; {})$
9 9"x
if(str.GetAt(str.GetLength()-1)!='\\') ,T5u'";
m_Path+="\\"; 9Sg<K)Mc
UpdateData(FALSE); v/QUjXBr
} v}(6 <wnnS
w=_Jc8/.
void CCaptureDlg::SaveBmp() !!,0'c
{ 4,P bg|
CDC dc; >,5i60Q
dc.CreateDC("DISPLAY",NULL,NULL,NULL); &1^%Nxu1
CBitmap bm; a\5FAkI
int Width=GetSystemMetrics(SM_CXSCREEN); aMuVqZw
int Height=GetSystemMetrics(SM_CYSCREEN); g.DLfwI|
bm.CreateCompatibleBitmap(&dc,Width,Height); VD7i52xS
CDC tdc; Wch~Yb
tdc.CreateCompatibleDC(&dc); |Ul,6K@f"5
CBitmap*pOld=tdc.SelectObject(&bm); "M
H6fF
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); OM83S|1s
tdc.SelectObject(pOld); QfpuZEUK
BITMAP btm; [0;buVU.
bm.GetBitmap(&btm); y-aRXF=W
DWORD size=btm.bmWidthBytes*btm.bmHeight; Fwg^(;bL
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); WrGK \Vw[
BITMAPINFOHEADER bih; X ]j)+DX>
bih.biBitCount=btm.bmBitsPixel; c-1q2y
bih.biClrImportant=0; #J\rv'
bih.biClrUsed=0; eny/
fm
bih.biCompression=0; J>0b1
bih.biHeight=btm.bmHeight; )r6EW`$
bih.biPlanes=1; y0bq;(~X~
bih.biSize=sizeof(BITMAPINFOHEADER); (c\hy53dP
bih.biSizeImage=size; Gpj* V|J
bih.biWidth=btm.bmWidth; PO-"M)M
bih.biXPelsPerMeter=0; .8gl< vX
bih.biYPelsPerMeter=0; *A}WP_ZQ
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); X JGB)3QI
static int filecount=0; k-LEI}h
CString name; ~eh0[mF^]
name.Format("pict%04d.bmp",filecount++); Ww3wsy x
name=m_Path+name; OEhHR
BITMAPFILEHEADER bfh; ^V*-1r1
bfh.bfReserved1=bfh.bfReserved2=0; .giz=*q+
bfh.bfType=((WORD)('M'<< 8)|'B'); cDEJk?3+
bfh.bfSize=54+size; ]2SF9p_
bfh.bfOffBits=54; (K..k-o`.
CFile bf; NaUr!s
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +JyUe
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z?NW1m()F
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1QqHF$S
bf.WriteHuge(lpData,size); T?
,P*l
bf.Close(); m6mwyom.
nCount++; K{ fsn4rk
} UL@9W6
GlobalFreePtr(lpData); zy'D!db`Z
if(nCount==1) R,2P3lv1v@
m_Number.Format("%d picture captured.",nCount); ZAKeEm2A
else )~)*=u/
m_Number.Format("%d pictures captured.",nCount); Kn;D?ioY
UpdateData(FALSE); M\<w#wZ
} 2.e
vx
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) eJCjJ)
{ K0pac6]
if(pMsg -> message == WM_KEYDOWN) 1j-te-}"c
{ ^eYqll/U
if(pMsg -> wParam == VK_ESCAPE) MxQ?Sb%Gka
return TRUE; 'J)2g"T@
if(pMsg -> wParam == VK_RETURN) ![6EUMx
return TRUE; /\s}uSW
} `Pn[tuIO
return CDialog::PreTranslateMessage(pMsg); ,B}I?vN.
} BI?@1q}:
r,P1^ uHx
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lfsqC};#\
{ NG&_?|OmV
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v60^4K>
SaveBmp(); 8e~|.wOL
return FALSE; :K82sCy%5
} g.JN_t5
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #%@*p,xh
CMenu pop; rx"s!y{!-
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); DciwQcG
CMenu*pMenu=pop.GetSubMenu(0); vR6Bn
pMenu->SetDefaultItem(ID_EXITICON); f
).1]~
CPoint pt; %%ae^*[!n
GetCursorPos(&pt); q_W0/Ki8
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); f&,{XZ
if(id==ID_EXITICON) lOwS&4UT
DeleteIcon(); nn b8Gcr
else if(id==ID_EXIT) # {fTgq
OnCancel(); \,Lo>G`!
return FALSE; %Pqk63QF
} OU4pjiLx
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %owsBO+
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) w=h1pwY
AddIcon(); R2L;bGI*J
return res; MF3b{|Z
} U'UQ|%5f
H2xeP%;$
void CCaptureDlg::AddIcon() 8 #X5K
{ +(D$9{y
NOTIFYICONDATA data;
B<8N96fx
data.cbSize=sizeof(NOTIFYICONDATA); YJS{i
CString tip; 3($"q]Y
tip.LoadString(IDS_ICONTIP); 0,s$T2
data.hIcon=GetIcon(0); Ogt]_
data.hWnd=GetSafeHwnd(); _ ~RpGX
strcpy(data.szTip,tip); Ed0I WPx
data.uCallbackMessage=IDM_SHELL; E+"dqSI/v
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Dlo xrdOY&
data.uID=98; Glq85S
Shell_NotifyIcon(NIM_ADD,&data); i`/+,<
ShowWindow(SW_HIDE); f\;65k_jq
bTray=TRUE; YJs|c\ eq?
} V>64/
Uw-p758dD
void CCaptureDlg::DeleteIcon() 2,vB'CAI
{
%dErnc$
NOTIFYICONDATA data; gef6pfV
data.cbSize=sizeof(NOTIFYICONDATA); j7FN\
cz
data.hWnd=GetSafeHwnd(); Hv]7e|
data.uID=98; obK*rdg,
Shell_NotifyIcon(NIM_DELETE,&data); H4OhIxK
ShowWindow(SW_SHOW); FtufuL?JS
SetForegroundWindow(); :RSz4
ShowWindow(SW_SHOWNORMAL); !@u>A_
bTray=FALSE; Cp^@zw*/
} ?::NO Dg
*xf ._~E
void CCaptureDlg::OnChange() #tt?!\8C
{ ES <1tG
RegisterHotkey(); xE}VTHFo'
} D7]#Xk2
oHM
]
BOOL CCaptureDlg::RegisterHotkey() Z') pf
{ z|G9,:9
UpdateData(); 0s#vwK13
UCHAR mask=0; ~mV"i7VX
UCHAR key=0; /wQL
if(m_bControl) JJV0R}z?TV
mask|=4; M-NV_W&M
if(m_bAlt) -]Cc
mask|=2; jO9ip
if(m_bShift) ^n#1<K[E
mask|=1; #5sD{:f`
key=Key_Table[m_Key.GetCurSel()]; P ]N
[y
if(bRegistered){ w)E@*h<Z
DeleteHotkey(GetSafeHwnd(),cKey,cMask); @/J[t
bRegistered=FALSE; O<9~Kgd8h
} AJt!!crs
cMask=mask; +&tgJ07A
cKey=key; Z>F^C}8f
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U5Erm6U:
return bRegistered; SEQ%'E5-'
} e"-X U@`k1
W#_/ak$uF*
四、小结 F}Mhs17!|
~:;3uLs,8
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。