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:
FW/)uf3I
Dxz5NW4 一、实现方法
F>TYVxQ $+iu\MuX 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
zz[g{[SN ?!R%o #pragma data_seg("shareddata")
2Qw)-EB HHOOK hHook =NULL; //钩子句柄
#wGQv UINT nHookCount =0; //挂接的程序数目
AUu5g static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
%}\ vW static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
K90D1sD static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
{jrZ?e-q static int KeyCount =0;
t7sUtmq
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
DS.39NY #pragma data_seg()
neK*jdaP 5c*p2:] 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
r*c82}tc 4RlnnXY DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
_, 11EeW@ 3zk:59 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
#/\pUK~km cKey,UCHAR cMask)
m9v"v:Pw {
^
yY{o/6 BOOL bAdded=FALSE;
Qfwwh`; for(int index=0;index<MAX_KEY;index++){
yLV2>kq if(hCallWnd[index]==0){
zojuH8 hCallWnd[index]=hWnd;
|2WxcW]U.% HotKey[index]=cKey;
Q9Q!9B@ HotKeyMask[index]=cMask;
,<`|-oa bAdded=TRUE;
5?<|3 KeyCount++;
h4J{j h. break;
|TC3*Y }
V]+o)A$ }
f_^ix return bAdded;
;bUJ+6f: }
2O}s*C$Xav //删除热键
de*,MkZN BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
(YaOh^T:| {
?v0A/68s# BOOL bRemoved=FALSE;
XfD
z
# for(int index=0;index<MAX_KEY;index++){
';i"?D?NAk if(hCallWnd[index]==hWnd){
\=HfO?$ Ro if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@1/Q hCallWnd[index]=NULL;
^yzo!`)fso HotKey[index]=0;
a*pXrp@ HotKeyMask[index]=0;
3s88#_eT bRemoved=TRUE;
5q0BG!A%T KeyCount--;
xc:`}4 break;
olUqBQ&ol }
#fJ/KYJU }
uzat."`d' }
'YBLU )v[ return bRemoved;
Lf$Q
%eM0 }
<=B1"'\ !gD 3CA b(+w.R(+Ti DLL中的钩子函数如下:
&!H~bzg ?,A}E|jZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
kKFuTem_3 {
)Tyky%P+iI BOOL bProcessed=FALSE;
bCJ<=X,g`K if(HC_ACTION==nCode)
~(w=U * {
1]a*Oer} if((lParam&0xc0000000)==0xc0000000){// 有键松开
_OyP>|L' switch(wParam)
hfl%r9o {
b/a?\0^ case VK_MENU:
6E)uu; 8 MaskBits&=~ALTBIT;
hY4)W break;
1t~S3Q||>] case VK_CONTROL:
n.;5P {V1 MaskBits&=~CTRLBIT;
=woqHTR break;
(ffOu#RQ3 case VK_SHIFT:
9RCB$Ka6X MaskBits&=~SHIFTBIT;
~Q.8 U3" break;
/j=DC9_ default: //judge the key and send message
,}xpYq_/ break;
Vq)|gF[6i }
#`YxoY ` for(int index=0;index<MAX_KEY;index++){
b#/V; if(hCallWnd[index]==NULL)
0+VncL)u continue;
1@1+4P0NF[ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
%^Q@*+{:f {
Zu [?' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
pqGf@24c< bProcessed=TRUE;
c_D,MW\IC }
oHc-0$eMKY }
3 cV+A]i }
#XYLVee, else if((lParam&0xc000ffff)==1){ //有键按下
gMoyy switch(wParam)
'Wx\"]: {
j?Jd@(*y$ case VK_MENU:
(e bBH MaskBits|=ALTBIT;
Os]!B2j14 break;
9;xL!cy case VK_CONTROL:
.:|#9%5 MaskBits|=CTRLBIT;
*`QdkVER break;
~L4*b*W case VK_SHIFT:
Qw{\sCH> MaskBits|=SHIFTBIT;
zBrWm_R5T break;
>%jEo'0;_ default: //judge the key and send message
3;-@<9 break;
Jnu}{^~ }
TQbFI;\ for(int index=0;index<MAX_KEY;index++){
`o^;fcnG if(hCallWnd[index]==NULL)
D x>1y continue;
q~:'R if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ECE{xoc {
mPw56> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6qHvq
A, bProcessed=TRUE;
8h@)9Q]d\ }
l/y
Kc8^< }
|GVGny< }
&EbD.>Ci if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
!Xv2PdP for(int index=0;index<MAX_KEY;index++){
]y)R C-N if(hCallWnd[index]==NULL)
;nAg4ll8Q continue;
7zJh;f/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
^V0{Ew/x SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
hsQ rd%{f //lParam的意义可看MSDN中WM_KEYDOWN部分
;'WzfJ!q }
-Uhl9
= }
C^8)IN=$ }
U d=gdsL return CallNextHookEx( hHook, nCode, wParam, lParam );
3 DO$^JJ. }
C.9eXa1wkT `)(
<g 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:
{TxVRpiP{Z :vgh
KI BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
nV,{w4t+ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
R1b
) tr9_bl&z 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:
y uK5 r w Ycz\uV LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
+y{93nl {
*F%ol;|Q if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
&:e}4/G {
D0E"YEo\nv //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
6UzT]" LR; SaveBmp();
j
O5:{% return FALSE;
2'UFHiK }
n\8[G[M …… //其它处理及默认处理
@qr3v>3X< }
E't G5,/m lo]B5_en ~"<VUJ=Ly: 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。
p?`|CE@h7 L_zmU_zD 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。
U~B}vt =Gg)GSL^ 二、编程步骤
$et
: @,>=X:7 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
~|B!.+ S1^Mw;?P 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
X%R^)zKV NE>JtTF< 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
YV _I-l0 C[<\ufclD 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
)hZ}$P1 ^D>M Dj6 5、 添加代码,编译运行程序。
5z(>4 d! .X=M! 三、程序代码
B+q+)O+ !y2h`ZAZ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
d`q)^ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
(!&O4C5 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
XX5(/# #if _MSC_VER > 1000
YT%SCaU #pragma once
\$\(9!= #endif // _MSC_VER > 1000
<+1w'- #ifndef __AFXWIN_H__
ZD] '$ #error include 'stdafx.h' before including this file for PCH
q$2taG} #endif
!L.z4n,n+ #include "resource.h" // main symbols
H1ui#5n2 class CHookApp : public CWinApp
ht
cO
~b {
F]&J%i
F[ public:
#O974f8 CHookApp();
Z We$(? // Overrides
^{sI'l~ // ClassWizard generated virtual function overrides
Ud(d Wj-/ //{{AFX_VIRTUAL(CHookApp)
O/r<VTOp public:
A)p!w aG virtual BOOL InitInstance();
"ZPbK$+=yU virtual int ExitInstance();
t T/*ZzMq# //}}AFX_VIRTUAL
^~1@HcJo //{{AFX_MSG(CHookApp)
w!h{P38 // NOTE - the ClassWizard will add and remove member functions here.
Lzx(!<v // DO NOT EDIT what you see in these blocks of generated code !
`kT$Gx4x //}}AFX_MSG
9 0(oV& DECLARE_MESSAGE_MAP()
S0QU@e };
&I'F-F; LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
z'}t@R#H BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
:IKp7BS BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
P}u<NPy3Q BOOL InitHotkey();
;\&bvGj8V BOOL UnInit();
f'yd{ihFp #endif
e$+? v2. n\)f.}YD8d //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
1bAp{u& #include "stdafx.h"
Mn{Rg>X #include "hook.h"
j9fL0$+FI #include <windowsx.h>
3eDx@8N
} #ifdef _DEBUG
P>,D$-3 #define new DEBUG_NEW
XV9'[V #undef THIS_FILE
vlKKPS static char THIS_FILE[] = __FILE__;
RKZk/ly #endif
gR6T]v #define MAX_KEY 100
c+M@{EbuN #define CTRLBIT 0x04
J0) WRn"h #define ALTBIT 0x02
S gsR;)2 #define SHIFTBIT 0x01
W p*
v Vv #pragma data_seg("shareddata")
^?VT y5yp HHOOK hHook =NULL;
0`Qs=R`OM UINT nHookCount =0;
+fR`@HI static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
J3JRWy@?P static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
iQj{J1V static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
jQlK-U=oi static int KeyCount =0;
rG%_O$_dO static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
{7s zo`U2 #pragma data_seg()
x@\'@>_GM HINSTANCE hins;
?\$/#zak void VerifyWindow();
/PuWJPy; BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
g/Nj|:3 //{{AFX_MSG_MAP(CHookApp)
p2?+[d // NOTE - the ClassWizard will add and remove mapping macros here.
/r{5Lyk* // DO NOT EDIT what you see in these blocks of generated code!
U"G+su->e //}}AFX_MSG_MAP
83(P_Y: END_MESSAGE_MAP()
t`3T_t Y qO'5*d;!d CHookApp::CHookApp()
o|im {
o)
?1`7^BA // TODO: add construction code here,
t/BiZo|zl // Place all significant initialization in InitInstance
<iqyDPj }
-~aEqj#? juZ3"" CHookApp theApp;
~PvzUT-^ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
`d;izQ1_= {
.Bn2;nO BOOL bProcessed=FALSE;
EqU[mqeF if(HC_ACTION==nCode)
$1
\!Oe[i {
.F|WQ7Mu if((lParam&0xc0000000)==0xc0000000){// Key up
8LKZ3Y| switch(wParam)
lLf01sa4 {
@Oay$gP{T case VK_MENU:
C&"2`ll MaskBits&=~ALTBIT;
~ ?_Z!eS break;
t$5]1dY$X case VK_CONTROL:
9!C?2*>A P MaskBits&=~CTRLBIT;
Z'kYf break;
bW3o%srxa case VK_SHIFT:
iR =aYT~ MaskBits&=~SHIFTBIT;
~ZC=!|Q# break;
/T(~T default: //judge the key and send message
k&;L(D break;
6>A8#VT }
}
~bOP^' for(int index=0;index<MAX_KEY;index++){
];]EK6dzG if(hCallWnd[index]==NULL)
(3*Hl continue;
FaM~ 56Pa if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
iB_j*mX] {
]bSt[ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
e5]0<s$ bProcessed=TRUE;
7FFYSv,[: }
k3kqgR* }
;VBfzFH }
^}L$[P else if((lParam&0xc000ffff)==1){ //Key down
bGa":|}F switch(wParam)
E6)mBAE {
VlNzm case VK_MENU:
Sw)ftC~d MaskBits|=ALTBIT;
A*i_-;W) break;
FZ/&[;E! case VK_CONTROL:
=w>QG{-N MaskBits|=CTRLBIT;
sva$@y7b break;
\2b9A'd> case VK_SHIFT:
Uij$
eBN MaskBits|=SHIFTBIT;
K`<P^XJr break;
Cu7iHh Y5 default: //judge the key and send message
5xKR
]u break;
Yl=
|P` }
B9-=.2.WU for(int index=0;index<MAX_KEY;index++)
s[bKGn@ {
9]\vw if(hCallWnd[index]==NULL)
5+Ut]AL5 continue;
n|6yz[N if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
K.7gd1I {
u] b6> SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
;_t on?bF bProcessed=TRUE;
XrF9*>ti? }
P.7B]&T6 }
,{at?y* }
jd*H$BU^ if(!bProcessed){
Z;:-8 HPDY for(int index=0;index<MAX_KEY;index++){
tDkqwF), if(hCallWnd[index]==NULL)
`#bcoK5 continue;
39CPFgi<l* if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
4|thDb)] SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
`^[ra%a }
jL$X3QS: }
E~Nr4vq }
bcf OpA return CallNextHookEx( hHook, nCode, wParam, lParam );
ER+[gT1CQ }
70~]J8T+u E{J;-+t BOOL InitHotkey()
|/$#G0X;H {
~Ua0pS? if(hHook!=NULL){
NKws;/u nHookCount++;
KhvCkQMI@ return TRUE;
|99eDgK, }
#s%$kYp 1 else
3#unh`3b hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
V96BtVsB if(hHook!=NULL)
J/Li{xp)Lg nHookCount++;
RB2u1]l return (hHook!=NULL);
zZ63
P }
T5)?6i-N BOOL UnInit()
dWA7U6c< {
"cx" d: if(nHookCount>1){
m" GrpE3 nHookCount--;
:&MiO3#+ return TRUE;
2S3F]fG0 }
B!0[LlF+ BOOL unhooked = UnhookWindowsHookEx(hHook);
zFIbCv8 if(unhooked==TRUE){
(WC<X Kf nHookCount=0;
M-_)CR hHook=NULL;
!=pemLvH }
Zh$Z$85p return unhooked;
"2-TtQV! }
p-Ju&4fS 9w1)Mf} BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
RA}PM?D/ {
9]iDNa/D BOOL bAdded=FALSE;
Qi M>59[ for(int index=0;index<MAX_KEY;index++){
81&!!qhfS if(hCallWnd[index]==0){
tH(Z9\L 7 hCallWnd[index]=hWnd;
O?_'6T HotKey[index]=cKey;
qyto`n7 HotKeyMask[index]=cMask;
n~Ix8|S h bAdded=TRUE;
^]HwStn&= KeyCount++;
u|E,Wy1 break;
d hy= x }
+;T%7j"wz }
O7W}Z1G return bAdded;
RN0Rk 8AC }
?d 4_'y
YA jk' BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
PNq#o%q {
f!<mI8H BOOL bRemoved=FALSE;
Kmtr.]Nj for(int index=0;index<MAX_KEY;index++){
lU?"\m if(hCallWnd[index]==hWnd){
1EN5ZN, if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
W!g
, hCallWnd[index]=NULL;
!**q20-aP HotKey[index]=0;
tB[K4GNSQ HotKeyMask[index]=0;
1D$k:|pP~ bRemoved=TRUE;
rqIt}(J KeyCount--;
V+ Z22 break;
;8!D8o(+ }
`&o|= }
GC~::m~ }
h W-[omr0 return bRemoved;
P VPwYmte }
2
UgjH F~:5/-zs void VerifyWindow()
b$BUo8O} {
z9gZ/d for(int i=0;i<MAX_KEY;i++){
S9.jc@#.` if(hCallWnd
!=NULL){ 7W*OyH^
if(!IsWindow(hCallWnd)){ (L\tp>
E-
hCallWnd=NULL; D4G{= Y}G
HotKey=0; C9fJLCufC
HotKeyMask=0; 3jQ
|C=
KeyCount--; nv={.H
} JO$0Z
} X@s s d
} Y\rKw!u_!
} R
.,w`<<
w v1R
]3}
BOOL CHookApp::InitInstance() TS-[p d
{ (mzyA%;W
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~DSle 3
hins=AfxGetInstanceHandle();
,{%[/#~6
InitHotkey(); `hbM2cM
return CWinApp::InitInstance(); N7[~Y2i
} QRRZMdEGs[
up`6IWlLE
int CHookApp::ExitInstance() *Hs5MXNu
{ Lczcz"t
VerifyWindow(); h0GXN\xI
UnInit(); hAY_dM
return CWinApp::ExitInstance(); [=iq4F'7
} f"[C3o2P
(Fu9lW}n
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 35ng_,t$
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) </fzBaTo
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V3UEuA
#if _MSC_VER > 1000 ]$7|1-&Y
#pragma once =[P ||
#endif // _MSC_VER > 1000 f}fM%0/5
bv+PbK]iO
class CCaptureDlg : public CDialog n9#@
e}r
{ [P<oyd@#
// Construction <|{=O9
public: P\Ka'i
BOOL bTray; Mqna0"IYx*
BOOL bRegistered; 'rSM6j
BOOL RegisterHotkey(); F:n7yey
UCHAR cKey; u+ -}|
UCHAR cMask; a+Z/=YUR
void DeleteIcon(); "Aynt_a.
void AddIcon(); CzwnmSv{.
UINT nCount; H7uW|'XWz
void SaveBmp(); +UB. M
CCaptureDlg(CWnd* pParent = NULL); // standard constructor S2`p&\Ifn
// Dialog Data GhX>YzD7
//{{AFX_DATA(CCaptureDlg) f>Ge
Em~
enum { IDD = IDD_CAPTURE_DIALOG }; |'Jz(dv[
CComboBox m_Key; 4kIy4x'*
BOOL m_bControl;
OH&&d=~
BOOL m_bAlt; 1vX97n<}
BOOL m_bShift; YM5;mPR
CString m_Path; qLcs)&}/A
CString m_Number; F&ux9zP
//}}AFX_DATA -ohqw+D
// ClassWizard generated virtual function overrides 1%>/%eyn5
//{{AFX_VIRTUAL(CCaptureDlg) -&+[/
public: VLR W,lR9O
virtual BOOL PreTranslateMessage(MSG* pMsg); Wu:evaZ:i
protected: `CRW2^g
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {`{U\w5Af
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); R+P1 +5
//}}AFX_VIRTUAL pJV<#<#Z
// Implementation ;0 ,-ywK
protected: emTqbO
HICON m_hIcon; Qv#]T,
// Generated message map functions 6z~6o0s~
//{{AFX_MSG(CCaptureDlg) L9@nx7D
virtual BOOL OnInitDialog(); B
lD
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?xIwQd0
afx_msg void OnPaint(); aCQAh[T
afx_msg HCURSOR OnQueryDragIcon(); "I
u3&mc
virtual void OnCancel(); V4_ZBeWA
afx_msg void OnAbout(); E-CZk_K9
afx_msg void OnBrowse(); wPyfne?~,
afx_msg void OnChange(); caS5>wk`R
//}}AFX_MSG oPl^tzO
DECLARE_MESSAGE_MAP() U4Il1|
M&
}; :Oxrw5`=
#endif h(ZZ7(ue
{"-uaH>,
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3b~k)t4R
#include "stdafx.h" X"*pt5B6`
#include "Capture.h" $)6y:t"
#include "CaptureDlg.h" I_\j05
#include <windowsx.h> ih~ R?W
#pragma comment(lib,"hook.lib") !?,rcgi
#ifdef _DEBUG 2Lm.;l4YO
#define new DEBUG_NEW qEE
V&
#undef THIS_FILE NU O9,
static char THIS_FILE[] = __FILE__; /alJN`g
#endif i,ga2{GnM
#define IDM_SHELL WM_USER+1 ~~z}yCl
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `i;f
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <8~bb-U$
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M/T
ll]\|
class CAboutDlg : public CDialog .O@T#0&=_
{ Zh,(/-XN;
public: lx(kbSxF
CAboutDlg(); :hC+r=!I
// Dialog Data 4+Wti!s
//{{AFX_DATA(CAboutDlg) -uX): h!
enum { IDD = IDD_ABOUTBOX }; }Dp/K4
//}}AFX_DATA )k$ +T%
// ClassWizard generated virtual function overrides V_^p?Fi#
//{{AFX_VIRTUAL(CAboutDlg) M]
7#
protected: /GRkQ",
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WTbq)D(&[_
//}}AFX_VIRTUAL E&9BeU
a#
// Implementation az/NZlJhT
protected: HW"@~-\
//{{AFX_MSG(CAboutDlg) +K {J*
n
//}}AFX_MSG "&W80,O3
DECLARE_MESSAGE_MAP() z&Cz!HrS
}; @p"m{
].w~FUa
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) },+ &y^
{ o !bV;]
//{{AFX_DATA_INIT(CAboutDlg) j"1#n? 0
//}}AFX_DATA_INIT NSI$uS6
} H[S[ y
U4M}E h8
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >cJf D9-<h
{ aYW9C<5
CDialog::DoDataExchange(pDX); vnc-W3N
//{{AFX_DATA_MAP(CAboutDlg) b1\.hi
//}}AFX_DATA_MAP F!ZE4S_
} mQUI9
Xs}.7
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) grrM[Y7#~b
//{{AFX_MSG_MAP(CAboutDlg) UU'0WIbY6
// No message handlers nHyqfd<V>
//}}AFX_MSG_MAP ^ZP
$(a4
END_MESSAGE_MAP() pr-=<[ d
_Fkz^B*
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #p$iWY>e~
: CDialog(CCaptureDlg::IDD, pParent) e*)*__$O
{ -aPRLHR
//{{AFX_DATA_INIT(CCaptureDlg) |kGj}v3
m_bControl = FALSE; z[|2od
m_bAlt = FALSE; F#=M$j_
m_bShift = FALSE; zl $mt'\y
m_Path = _T("c:\\"); }JI@f14
m_Number = _T("0 picture captured."); [0MNq]gxf
nCount=0; $Y`oqw?g+^
bRegistered=FALSE; JCO+_d#x
bTray=FALSE; Gu@n1/m@o
//}}AFX_DATA_INIT sBm)D=Kll
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 LT[g
+zGB
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); c]}F$[>oN'
} ?&Ug"$v
SR_<3WW
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) v9*31Jx
{ lWPh2k
CDialog::DoDataExchange(pDX); YpJJ]Rszg
//{{AFX_DATA_MAP(CCaptureDlg) p?-qlPl
DDX_Control(pDX, IDC_KEY, m_Key); uo`zAKM&A
DDX_Check(pDX, IDC_CONTROL, m_bControl); 6({TG&`!]
DDX_Check(pDX, IDC_ALT, m_bAlt); i/|}#yw8A
DDX_Check(pDX, IDC_SHIFT, m_bShift); !{q_Q !
DDX_Text(pDX, IDC_PATH, m_Path); z_f^L %J0
DDX_Text(pDX, IDC_NUMBER, m_Number); D| |)H
//}}AFX_DATA_MAP hU'h78bt(
} Xrl# DN
L0.F}~S
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {;5\ #VFg
//{{AFX_MSG_MAP(CCaptureDlg) Ahkq
ON_WM_SYSCOMMAND() Ua%;hI)j$
ON_WM_PAINT() -kzp>=
ON_WM_QUERYDRAGICON() ZSvU1T8
ON_BN_CLICKED(ID_ABOUT, OnAbout) 9x`1VR
:
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &8\6%C
ON_BN_CLICKED(ID_CHANGE, OnChange) ij5|P4Eka
//}}AFX_MSG_MAP Nnx dO0X
END_MESSAGE_MAP() B_mT[)ut
{ k>T*/
BOOL CCaptureDlg::OnInitDialog() ;&c9!LfP
{ xciwKIpS
CDialog::OnInitDialog(); *47HN7
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); G,!{Q''w
ASSERT(IDM_ABOUTBOX < 0xF000); >npTUOGL=n
CMenu* pSysMenu = GetSystemMenu(FALSE); .fAHP
5-
if (pSysMenu != NULL) O!se-h5mW8
{ MFeY}_d<
CString strAboutMenu; fU<_bg
strAboutMenu.LoadString(IDS_ABOUTBOX); = IJ}b=:
if (!strAboutMenu.IsEmpty()) r17"i.n
{ gz#2}
pSysMenu->AppendMenu(MF_SEPARATOR);
XFSHl[uS1
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
YWAH(
} IFsh"i
} ;F|8#! (
SetIcon(m_hIcon, TRUE); // Set big icon nvB<pSm
SetIcon(m_hIcon, FALSE); // Set small icon s+t[{i4|
m_Key.SetCurSel(0); "^Vnnb:Z*o
RegisterHotkey(); &6e A.
CMenu* pMenu=GetSystemMenu(FALSE); .;F%k,!v
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zJ)`snN|
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t|P+^SL
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6L"b O'_5K
return TRUE; // return TRUE unless you set the focus to a control !&},h=
} ;;S9kNp^v
f cnv[B..{
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) jr(|-!RVMN
{ KwNOB _
if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0SR[)ma
{ s2`} ~
CAboutDlg dlgAbout; -e O>d}
dlgAbout.DoModal(); U1Y0G[i)
} k%R(Qga
else O{x-9p
{ j1HeX
CDialog::OnSysCommand(nID, lParam); `
ZBOaN^if
} ^EJ]LNk}
} vddl9"V)
3"Zc|Ck <?
void CCaptureDlg::OnPaint() O"}O~lZ[6T
{ +w?-#M#
if (IsIconic()) !t[;~`d9
{ qND:LP\_v
CPaintDC dc(this); // device context for painting O{p7I&
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); e(I;[G +%,
// Center icon in client rectangle </pt($
int cxIcon = GetSystemMetrics(SM_CXICON); @HE<\Z{ KI
int cyIcon = GetSystemMetrics(SM_CYICON); .P#t"oW}
CRect rect; +
B<7]\\M
GetClientRect(&rect); _
h/:r1
int x = (rect.Width() - cxIcon + 1) / 2; xb2j
|KY7
int y = (rect.Height() - cyIcon + 1) / 2; *B)10R
// Draw the icon NIAji3
dc.DrawIcon(x, y, m_hIcon); G\R6=K:f7
} %?3$~d\n
else jx'hxC'3
{ 1{Ik.O)
CDialog::OnPaint(); l{QlJ>%~{;
} BCO (,k
} dVMLn4[,MA
OaKr_m
HCURSOR CCaptureDlg::OnQueryDragIcon() tkQrxa|
{ !yvw5As %
return (HCURSOR) m_hIcon; W/VEB3P>Z
} 1:RK~_E
tr58J%Mu
void CCaptureDlg::OnCancel() m=TZfa^r
{ Wo Z@
if(bTray) 5S[:;o
DeleteIcon(); x\IuM
CDialog::OnCancel(); k*OHI/uiow
} >`^;h]Q
Wj8WT)cB
void CCaptureDlg::OnAbout() ^B8[B&K
{ [b3$em<^JV
CAboutDlg dlg; 7Y)i>[u3
dlg.DoModal(); O;$}j:;KF
} p0D@O_
:5
8@ S@^C*F
void CCaptureDlg::OnBrowse() ,Iru_=Wk~
{ L#WGOl
CString str; "EVf1iQ
BROWSEINFO bi; '!`| H 3
char name[MAX_PATH]; 9rIv-&7'm
ZeroMemory(&bi,sizeof(BROWSEINFO)); ixL[(*V
bi.hwndOwner=GetSafeHwnd(); /i
bi.pszDisplayName=name; kkJ8xyO
bi.lpszTitle="Select folder"; PzT@q\O
bi.ulFlags=BIF_RETURNONLYFSDIRS; --k!KrL
LPITEMIDLIST idl=SHBrowseForFolder(&bi); MwX8F YF
D
if(idl==NULL) 1+[,eq
return; `QZKW
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Tkn8Wj
str.ReleaseBuffer(); .$1S-+(kV
m_Path=str; 9I}Uh#]k<
if(str.GetAt(str.GetLength()-1)!='\\') Rp!"c
m_Path+="\\"; l
GJ N;G7
UpdateData(FALSE); h7 mk<
} 'J)9#
;I6C`N
void CCaptureDlg::SaveBmp() @vL0gzE?nB
{ y4VO\N!
CDC dc; !hE F.S
dc.CreateDC("DISPLAY",NULL,NULL,NULL); "([lkn
CBitmap bm; efuiFN;
int Width=GetSystemMetrics(SM_CXSCREEN); AF,;3G
int Height=GetSystemMetrics(SM_CYSCREEN); FxT]*mo
bm.CreateCompatibleBitmap(&dc,Width,Height); 2km0
CDC tdc; XjmAM/H4
tdc.CreateCompatibleDC(&dc); {].]`#4Jx
CBitmap*pOld=tdc.SelectObject(&bm); bN|1%[7
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (=j/"Mb
tdc.SelectObject(pOld); qiq=v)
BITMAP btm; O|+$9#,
bm.GetBitmap(&btm); V bNN1'a-
DWORD size=btm.bmWidthBytes*btm.bmHeight; e(FT4KD~
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UR(i_T&w
BITMAPINFOHEADER bih; t0za%q!fK<
bih.biBitCount=btm.bmBitsPixel; <dAxB$16sT
bih.biClrImportant=0; 7+Nl)d:CJ
bih.biClrUsed=0; EWq
< B)
bih.biCompression=0; wKoar
bih.biHeight=btm.bmHeight; :H#D4O8UiH
bih.biPlanes=1; >[~`rOU*|Y
bih.biSize=sizeof(BITMAPINFOHEADER); ztAC3,r]
bih.biSizeImage=size; BqpJvRJd
bih.biWidth=btm.bmWidth; lanU)+U.
bih.biXPelsPerMeter=0; I}|E_U1Qj
bih.biYPelsPerMeter=0; 9ph>4u(R
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (4IP&^j:\
static int filecount=0; ;kZJnN"y
CString name; ^E)8Sb9t
name.Format("pict%04d.bmp",filecount++); Galh _;=
name=m_Path+name; m|;gl|dTB
BITMAPFILEHEADER bfh; m8eoD{
bfh.bfReserved1=bfh.bfReserved2=0; y3bL\d1
bfh.bfType=((WORD)('M'<< 8)|'B'); y-S23B(
bfh.bfSize=54+size; \?|^w.
bfh.bfOffBits=54; 0g
Hd{H=
CFile bf; @i#=1)Ze
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yTNHM_P
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IsVR4t]
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); YS<KyTb"
bf.WriteHuge(lpData,size); }9 N-2]
bf.Close(); W"\+jHF"
nCount++; sxdDI?W4
} ma/<#l^}
GlobalFreePtr(lpData); r=xec@R]*
if(nCount==1) NC YOY
m_Number.Format("%d picture captured.",nCount); vst;G-ys
else e`+ej-o,
m_Number.Format("%d pictures captured.",nCount); `Gx
5=Bm;
UpdateData(FALSE); gc
b8eB,
} }*!_M3O
JdUI:(
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9H53H"5q
{ KM[&WT
if(pMsg -> message == WM_KEYDOWN) a/rQ@ c>
{ DcC|oU[
if(pMsg -> wParam == VK_ESCAPE) d7uS[tKqg
return TRUE; <e wcWr
if(pMsg -> wParam == VK_RETURN) xa967Ki9"
return TRUE; gt=@v())
} P,7R/-u 5D
return CDialog::PreTranslateMessage(pMsg); jF(R;?,
} ]vw%J ^7:a
p _2Y c]8
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6KE64: \;
{ 7f*b5$+r
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )%
gU
SaveBmp(); :OqEkh"$#
return FALSE; 1_8@yO
} {$7vd
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8|u8J0^
CMenu pop; jN(c`Gb
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); T t_QAIl
CMenu*pMenu=pop.GetSubMenu(0); ,>nf/c0.
pMenu->SetDefaultItem(ID_EXITICON); I9nm$,i]7
CPoint pt; \K lY8\c[
GetCursorPos(&pt); ^rGuyW#
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ];eJ'#
if(id==ID_EXITICON) .R#<Q
DeleteIcon(); kt7Em b}
else if(id==ID_EXIT) aU#r`D@0
OnCancel(); !,sQB_09C
return FALSE; 'oM=ZU8wo
} ,,g: x
LRESULT res= CDialog::WindowProc(message, wParam, lParam); m!(dk]
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 	HV
AddIcon(); 3GMrdG?Y
return res; TXbi>t:/S{
} C?<[oQb#
f'tQLF[r<
void CCaptureDlg::AddIcon() Z}IuR|=
{ +O8}twt@
NOTIFYICONDATA data; <d[GGkY]=
data.cbSize=sizeof(NOTIFYICONDATA); {+gK\Nz
CString tip; )/z+W[t
tip.LoadString(IDS_ICONTIP); l{\k\Q !4
data.hIcon=GetIcon(0); <!*O[0s
data.hWnd=GetSafeHwnd(); @mcP-
strcpy(data.szTip,tip); Shss};QZf(
data.uCallbackMessage=IDM_SHELL; ?}S~cgL -
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZfS"
data.uID=98; Y+EwBg)co
Shell_NotifyIcon(NIM_ADD,&data); ~F;>4q
ShowWindow(SW_HIDE); Smd83W&
bTray=TRUE; R0nUS<b0
} ,0?3k
Qe]&
void CCaptureDlg::DeleteIcon() Q.V+s
{ l\u5RMS('
NOTIFYICONDATA data; 3'7X[{uBr
data.cbSize=sizeof(NOTIFYICONDATA); ApcE)mjpc
data.hWnd=GetSafeHwnd(); ^~3{n
data.uID=98; !F2JT@6
Shell_NotifyIcon(NIM_DELETE,&data); kPSi6ci
ShowWindow(SW_SHOW); >/.Ae8I)
SetForegroundWindow(); bV*q~@xh
ShowWindow(SW_SHOWNORMAL);
B"t4{1/
bTray=FALSE; jz I,B
} 1NAtg*`
`R-VJR 2"
void CCaptureDlg::OnChange() c=Zurqj
{ 3)l<'~"z<
RegisterHotkey(); o%h[o9i
} #BI6+rfv|
, lBHA+@
BOOL CCaptureDlg::RegisterHotkey() h0l_9uI
{ ei[, ug'
UpdateData(); (cp$poo
UCHAR mask=0; QD
0p
UCHAR key=0; {y<E_y
x1
if(m_bControl) 7V"Jfh4_
mask|=4;
H$,wg!kY!
if(m_bAlt) ~S0T+4$
mask|=2; l i%8X.
if(m_bShift) 1Nz#,IdQ
mask|=1; $
\ I|6[P
key=Key_Table[m_Key.GetCurSel()]; h|EHK!<"8
if(bRegistered){ x`K"1E{2
DeleteHotkey(GetSafeHwnd(),cKey,cMask); '~x jaa;.
bRegistered=FALSE; u}jC$T>2%6
} |+1k7S,
cMask=mask; z~jk_|?|?
cKey=key; &qm:36Y7Xg
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Eq5X/Hx
return bRegistered; 0}\8,U
} }jL4F$wC
ItG|{Bo
四、小结 n&E/{o(
g7K<"Z {M
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。