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:
AD\<}/3U
Jg:-TK/ 一、实现方法
[kOA+\v V]]qu:Mh8 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:
.$0Ob<. ;J(,F:N #pragma data_seg("shareddata")
pK9^WT@ HHOOK hHook =NULL; //钩子句柄
X~he36-+< UINT nHookCount =0; //挂接的程序数目
5}xni static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
~(j'a!#Vvk static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
wYA/<0'yH static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
D:E~yh)$- static int KeyCount =0;
nb_^3K]r static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
1N!g`=} #pragma data_seg()
qffSq](D. Jyci}CU3\Q 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。
A+*oT(` A{I
a21T7 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:
oqba:y;AR
9JV
3 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
7J;~&x cKey,UCHAR cMask)
<cv1$
x ~P {
q#*6 )B BOOL bAdded=FALSE;
`Kw"XGT for(int index=0;index<MAX_KEY;index++){
En9]x"_ if(hCallWnd[index]==0){
&}0wzcMg hCallWnd[index]=hWnd;
fq'Xy9L HotKey[index]=cKey;
Om2X>/V%C HotKeyMask[index]=cMask;
CQHp4_ bAdded=TRUE;
:6$4K"^1 KeyCount++;
U|7Qw|I7 break;
rm=~^eB }
r!$NZ2I }
X$ B]P7G7 return bAdded;
sV^h#g~Zb }
s#4ew} //删除热键
zQ5jx5B": BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
1O2h9I$bk {
@'r`(o3z!Z BOOL bRemoved=FALSE;
aE\BAbD7 for(int index=0;index<MAX_KEY;index++){
3y=<w|4F if(hCallWnd[index]==hWnd){
Z!-<rajl if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)fMX!#KP hCallWnd[index]=NULL;
DV[ Jbl:) HotKey[index]=0;
q9 brpbg_ HotKeyMask[index]=0;
{,f!'i&b@ bRemoved=TRUE;
UW/3{2 KeyCount--;
!^l4EL5# break;
i9\\evJs }
HCjn9 }
;2Ad]) }
JXY!c\, return bRemoved;
rZ.a>'T4 }
d0A\#H_& C*s0r; [B~zoB( DLL中的钩子函数如下:
IN|i)?rh 2Ph7qEBQ22 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
)YnI!v2T {
PF'5z#] NP BOOL bProcessed=FALSE;
) qyx|D if(HC_ACTION==nCode)
eY4`k {
XW~ BEa if((lParam&0xc0000000)==0xc0000000){// 有键松开
lNaez3 switch(wParam)
n.a=K2H:V {
CFBUQMl> case VK_MENU:
(]}x[F9l MaskBits&=~ALTBIT;
Y-%l7GErhL break;
V8nz-DL{ case VK_CONTROL:
/+4^.Q* MaskBits&=~CTRLBIT;
B15O,sL&W break;
r%TLv case VK_SHIFT:
!qTpQ5Dm MaskBits&=~SHIFTBIT;
V<HOSB7 break;
EFRZ% Y default: //judge the key and send message
{(M&-~Yh break;
8g[(nxI~ }
*X=@yB*aK for(int index=0;index<MAX_KEY;index++){
~^rey if(hCallWnd[index]==NULL)
=M1a 0i|d continue;
+ 9\:$wMN if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~jp!"f {
sd]54&3A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
0+K`pS' bProcessed=TRUE;
agU%z:M{ }
QH7V_#6bKP }
~{7zm"jN }
J|gdO+ else if((lParam&0xc000ffff)==1){ //有键按下
d`?U!?Si switch(wParam)
VQy9Y {
o%V
@D'w case VK_MENU:
OX)#F'Sl} MaskBits|=ALTBIT;
?qf:_G break;
~^lH ^J case VK_CONTROL:
J ?ztn MaskBits|=CTRLBIT;
9{)Z5%Kz break;
Em~7D]Y case VK_SHIFT:
Qb!!J4|! MaskBits|=SHIFTBIT;
}zkL[qu; break;
f$1Gu default: //judge the key and send message
<=;H[}
e break;
FF%\gJ }
qZ8|B for(int index=0;index<MAX_KEY;index++){
*F\T}k7 if(hCallWnd[index]==NULL)
8%;}LK continue;
Ne &Xf if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1.Haf {
DC?21[60 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
0V<Aub[${ bProcessed=TRUE;
zyaW3th }
cr76cYq"Q }
@T<ad7g-2J }
RDUT3H6~ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
9U#\nXM for(int index=0;index<MAX_KEY;index++){
o2;(VSKhS if(hCallWnd[index]==NULL)
/C*~/} continue;
=E&b= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
44\!PYf7 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
J?._/RL8- //lParam的意义可看MSDN中WM_KEYDOWN部分
`%$8cZ-kr }
&}vR(y*#c }
~'NX~<m }
;$vLq&(} return CallNextHookEx( hHook, nCode, wParam, lParam );
x1t{SQ-C }
"/Y<G j_!bT!8 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:
<KKDu$W|T Ee{ `Y0 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
X.s*>' BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
K@q&HV"'. :~vxZ*a 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
_~tm7o+js 0yn[L3x7 LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
^:m^E0(H {
Rb)|66&3& if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
fi=0{ {
ypH8QfxLTr //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
3FFaEl SaveBmp();
*dN N< return FALSE;
Y!Drb-U?; }
uaiz*Im …… //其它处理及默认处理
+fM&su=wl }
4avc=Y5 E(_KN[}S #>=8w9] 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
Nu@5 kwH GMz8B-vk 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
_l<mu? " &M[MEO`t8 二、编程步骤
[q1Unm |8bE9qt.P 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
Rv,82iEKs flP>@i:e6 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
Dzr e' BBxc*alG0 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
I FsE!oDs4 X'f)7RbT 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
GzdRG^vN -j&Vtr 5、 添加代码,编译运行程序。
bG(x:Py& ZZ("-#? 三、程序代码
W .U+.hR h$pk<< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
_42Z={pZZq #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
T6uMFD4 | #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
tw<P)V\h #if _MSC_VER > 1000
4d`+CD C #pragma once
o&z!6"S< #endif // _MSC_VER > 1000
Me,<\rQ #ifndef __AFXWIN_H__
;'}'5nO=$ #error include 'stdafx.h' before including this file for PCH
"]#'QuR #endif
)t%h[0{{ #include "resource.h" // main symbols
oxfF`L" class CHookApp : public CWinApp
89Z#|#uM5 {
2bLI%gg3 public:
& fu z2xv CHookApp();
\0?$wIH? // Overrides
1HbFtU`y~ // ClassWizard generated virtual function overrides
2n)gpLIJ //{{AFX_VIRTUAL(CHookApp)
.x-J44i@/ public:
vd (?$ virtual BOOL InitInstance();
]JdJe6`Mc virtual int ExitInstance();
Xwq]f:@V //}}AFX_VIRTUAL
jO8X:j09A //{{AFX_MSG(CHookApp)
;iU%Kt // NOTE - the ClassWizard will add and remove member functions here.
YJ,*(A18 // DO NOT EDIT what you see in these blocks of generated code !
8z}^jTM //}}AFX_MSG
SkHYXe"] DECLARE_MESSAGE_MAP()
Yw)Fbt^ };
c-B/~& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
V_"f|[1 BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}pawIf4V BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
zkexei4^< BOOL InitHotkey();
"3}<8c BOOL UnInit();
fF;h V #endif
.z-UOyer P!e= b-T //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
W5SN I>|E #include "stdafx.h"
z%sy$^v@vD #include "hook.h"
{^m Kvc #include <windowsx.h>
}mk>!B}= #ifdef _DEBUG
e |V] #define new DEBUG_NEW
C:i|-te #undef THIS_FILE
zzIr2so static char THIS_FILE[] = __FILE__;
K_ke2{4Jm #endif
}x :f%Z5h #define MAX_KEY 100
0.Vi97` #define CTRLBIT 0x04
ss
iok LE #define ALTBIT 0x02
,_ .v_ #define SHIFTBIT 0x01
O0huqF$K #pragma data_seg("shareddata")
lH2wG2 HHOOK hHook =NULL;
57Z- UINT nHookCount =0;
h|)vv4-d| static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
vH[Pb#f- static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
ke%pZ7{u static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
)9L/sKz static int KeyCount =0;
}6]0hWsN[ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
ub K7B |p #pragma data_seg()
.`p&ATgv HINSTANCE hins;
rHz||jjU void VerifyWindow();
-VT+O+9_A BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
BRv x[u //{{AFX_MSG_MAP(CHookApp)
+TJEG?o // NOTE - the ClassWizard will add and remove mapping macros here.
,[!LCXp // DO NOT EDIT what you see in these blocks of generated code!
k)7{Y9_No //}}AFX_MSG_MAP
M;.ZM<Ga END_MESSAGE_MAP()
/+|#^:@ RU#F8O CHookApp::CHookApp()
!3qVB {
$}o
b,i^W // TODO: add construction code here,
QLKK.] // Place all significant initialization in InitInstance
~E5z"o6$ }
<q2?S @)6jE!LC CHookApp theApp;
Jkt4@h2Q} LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7h9U{4r: M {
)>a B BOOL bProcessed=FALSE;
1;F`c`0< if(HC_ACTION==nCode)
~d
>W?A {
7'lZg<z{~j if((lParam&0xc0000000)==0xc0000000){// Key up
/)3Lnn{W switch(wParam)
ec3<%+0f {
&[[K"aM1 case VK_MENU:
$ &UZy|9 MaskBits&=~ALTBIT;
Rl~T$
Ey break;
~+6Vdxm case VK_CONTROL:
sW@krBxMv MaskBits&=~CTRLBIT;
ti @kKz break;
#]Y>KX2HG case VK_SHIFT:
wq!iV | MaskBits&=~SHIFTBIT;
/e@H^Cgo break;
r(A.<`\ default: //judge the key and send message
TFQ!7'xk) break;
9ooY?J }
G4 _, for(int index=0;index<MAX_KEY;index++){
eOT+'[3" if(hCallWnd[index]==NULL)
gb|Q%LS9R continue;
/iaf ^
> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
V9NTs8LKc {
T1WWK' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
?/hZb"6W bProcessed=TRUE;
8+Llx }
r=.A'"Kf }
G\d$x4CVGc }
~wm;;#_O else if((lParam&0xc000ffff)==1){ //Key down
t<iEj"5 switch(wParam)
>w6taX {
a?h*eAAc. case VK_MENU:
Q
n)d2-< MaskBits|=ALTBIT;
O*6n$dUj3 break;
*jq7X case VK_CONTROL:
y]
oaO+ MaskBits|=CTRLBIT;
nuQ]8- , break;
d~J-|yyT case VK_SHIFT:
igL<g MaskBits|=SHIFTBIT;
`mfq
2bVc break;
0fXLcal default: //judge the key and send message
R7jmv n break;
`O?T.p) }
+avMX&% for(int index=0;index<MAX_KEY;index++)
2NGeC0= {
ji1HV1S if(hCallWnd[index]==NULL)
D1
Z{W continue;
_n8GWBi if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.R*!aK {
^ >x|z. SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
_9H*agRe bProcessed=TRUE;
4LcX<BU9 }
}GMbBZ:nKK }
8F(h*e_? }
0-Y:v(|. if(!bProcessed){
1F8 W9b^D for(int index=0;index<MAX_KEY;index++){
/PBaIoJE if(hCallWnd[index]==NULL)
4BYE1fUzd continue;
n%^ LPD if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Z7rJ}VP SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
#m{{a]zm^ }
=WdaxjenZ/ }
63|+2-E2Q }
r~-.nb"P return CallNextHookEx( hHook, nCode, wParam, lParam );
8b.u'r174 }
AmPMY:1i" u=F+(NE" BOOL InitHotkey()
>KLtY|o) {
5Z/GK2[HL if(hHook!=NULL){
0 S_ ':r nHookCount++;
_-!sBK+F return TRUE;
sbkQ71T: }
z{"2S=" else
W%2
80\h hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
3nZ9m if(hHook!=NULL)
@RFs/' nHookCount++;
=p^He! return (hHook!=NULL);
ne61}F"E }
FsB^CxVg BOOL UnInit()
hv 6@Jr3 {
4h!f/aF' if(nHookCount>1){
X{n- N5* nHookCount--;
P7ph}mB return TRUE;
J`q]6qf# }
e~ aqaY~} BOOL unhooked = UnhookWindowsHookEx(hHook);
?&LZB}1R if(unhooked==TRUE){
h)1qp Qj nHookCount=0;
8(.mt/MR hHook=NULL;
9odJr] }
IKtB; return unhooked;
6iEhsL&K }
!Fw?H3X!"q =1I#f BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
,P'P^0qJ {
Qu=LnGo~P BOOL bAdded=FALSE;
PkE5|d*, for(int index=0;index<MAX_KEY;index++){
x\&`>>uA if(hCallWnd[index]==0){
ZvYLL{>}w hCallWnd[index]=hWnd;
w{~+EolK HotKey[index]=cKey;
zWpqJK HotKeyMask[index]=cMask;
Wk:hFHs3 bAdded=TRUE;
>e2<!#er| KeyCount++;
wxm:7$4C break;
Q6o(']0 }
n .!Ym
X4 }
/vY_Y3k# return bAdded;
aK,z}l(N }
9_\'LJ t
E` cau BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
ml@2wGyf {
xD&^j$Em BOOL bRemoved=FALSE;
h2ZkCML for(int index=0;index<MAX_KEY;index++){
]
2DH; if(hCallWnd[index]==hWnd){
,f}UGd[a if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
2<&Bw2 hCallWnd[index]=NULL;
)$w*V9d HotKey[index]=0;
]M)O YY HotKeyMask[index]=0;
9Rm/V5 bRemoved=TRUE;
Auy_K?he] KeyCount--;
$^&ig break;
{_(\`> }
Oz|K8p }
|AlR^N }
6"c1;P!4 return bRemoved;
Xh J,"=E+ }
ZKg{0DY *lef=:&,, void VerifyWindow()
;"O&X<BX- {
@fuM)B1" for(int i=0;i<MAX_KEY;i++){
_k^0m if(hCallWnd
!=NULL){ `/Nm
2K
if(!IsWindow(hCallWnd)){ "<}&GcJbz
hCallWnd=NULL; vP7K9Kx
HotKey=0; 3nY1[,
HotKeyMask=0; #fj/~[Ajv
KeyCount--; fN"(mW>!
} Qb8KPpd
} tpy>OT$
} :V2bS
} P}.7Mehf
DK0.R]&4(
BOOL CHookApp::InitInstance() {JV@"t-X3"
{ "O8gJ0e
AFX_MANAGE_STATE(AfxGetStaticModuleState()); A:<;M@q!
hins=AfxGetInstanceHandle(); H:p Z-v*
InitHotkey(); .1 %T
W)
return CWinApp::InitInstance(); RE.r4uOJg
} z} '! eCl
w&4~Q4
int CHookApp::ExitInstance() Mg#j3W}]
{ CF|]e:
VerifyWindow(); nA?Hxos
UnInit(); Y!6/[<r$~k
return CWinApp::ExitInstance(); *5<Sr q'
} ,@m@S^
eMRar<)+#*
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file smG>sEp2
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CE15pNss
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4@.|_zY
#if _MSC_VER > 1000 3D9!M-
#pragma once @|a>&~xX
#endif // _MSC_VER > 1000 ?^:h\C^a"
p0.|<
class CCaptureDlg : public CDialog VL9-NfeqR
{ 'WHHc 9rG,
// Construction ~.%K/=wK @
public: e T'nl,e|
BOOL bTray; ,Ma.V\T[
BOOL bRegistered; 4/X/>Y1
BOOL RegisterHotkey(); k`".
UCHAR cKey; "uLjIIl
UCHAR cMask; C0=9K@FCb
void DeleteIcon(); C@N1ljXJT
void AddIcon(); #S%Q*k<hw
UINT nCount; ,:+dg(\r
void SaveBmp(); DoC(Z)o
CCaptureDlg(CWnd* pParent = NULL); // standard constructor tweY'x.{
// Dialog Data UN"(5a8.
//{{AFX_DATA(CCaptureDlg) 4`#F^2r!
enum { IDD = IDD_CAPTURE_DIALOG }; _ >`X]I;
CComboBox m_Key; kF7(f|*
BOOL m_bControl; tU"raP^=
BOOL m_bAlt; lCW8<g^
BOOL m_bShift; bYe;b><G
CString m_Path; ZxGP/D
CString m_Number; R];Oxe
//}}AFX_DATA s=?aox7
// ClassWizard generated virtual function overrides X &2oPo
//{{AFX_VIRTUAL(CCaptureDlg) JcJmds
public: \b}~2oX
virtual BOOL PreTranslateMessage(MSG* pMsg);
7\o!HMfK
protected: &iN--~}!$
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2A4FaBq"
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +Taa!hfys
//}}AFX_VIRTUAL -Xz?s
// Implementation HG/p$L*
protected: uGdp@]z&8Q
HICON m_hIcon;
2?Ye*-
// Generated message map functions =Cqv=
//{{AFX_MSG(CCaptureDlg) PR<||"03
virtual BOOL OnInitDialog(); bIt=v)%$
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ()PKw,pD
afx_msg void OnPaint(); \EoX8b}$b0
afx_msg HCURSOR OnQueryDragIcon(); Uadr>#C*
virtual void OnCancel(); 5CAR{|a
afx_msg void OnAbout(); _eLWQ|6Fx
afx_msg void OnBrowse(); PIcrA2ll
afx_msg void OnChange(); o/[
//}}AFX_MSG Ct$82J
DECLARE_MESSAGE_MAP() #s5 pz8v
}; ;%J5=f%z)
#endif Kr L>FI
%Qn(rA@9
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QGiAW7b5
#include "stdafx.h" X
fz`^x>M
#include "Capture.h" fbZibcQ%k
#include "CaptureDlg.h" SM[{BH<
#include <windowsx.h> OLq
0V3m
#pragma comment(lib,"hook.lib") {u7##Vrgt8
#ifdef _DEBUG >5~7u\#9
#define new DEBUG_NEW G,&%VQ3P>
#undef THIS_FILE 2k7bK6=nm
static char THIS_FILE[] = __FILE__; zH)_vW
#endif lD;'tqaC
#define IDM_SHELL WM_USER+1 x)5V.q
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Bp AB5=M0
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lp&!lb`
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x_@i(oQ:_
class CAboutDlg : public CDialog (J:dK=O@Z
{ {I%y;Aab8
public: q5&Ci`
CAboutDlg(); WoL9V"]
// Dialog Data !7H6i#g*
//{{AFX_DATA(CAboutDlg) "5DJu~
enum { IDD = IDD_ABOUTBOX }; 4h
5_M8I
//}}AFX_DATA _|c&@M
// ClassWizard generated virtual function overrides 8?TKN~ja
//{{AFX_VIRTUAL(CAboutDlg) lHBI
protected: aP~gaSx
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kL{;.WsB
//}}AFX_VIRTUAL 7-iIay1h"
// Implementation ka7uK][
protected: `LP!D
//{{AFX_MSG(CAboutDlg) ayp b
//}}AFX_MSG .e[Tu|qo
DECLARE_MESSAGE_MAP() o sdOw8
}; ~P1_BD(
pD`/_-=^h
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) euRss#;
{ H~+xB1
//{{AFX_DATA_INIT(CAboutDlg) +!>LY
//}}AFX_DATA_INIT \tt'm\_
} 3_ 2hC!u!K
=DgCC|p
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?A=b6Um
{ T`L}[?w
CDialog::DoDataExchange(pDX); 3l:XhLOj
//{{AFX_DATA_MAP(CAboutDlg) ~^o=a?L`<
//}}AFX_DATA_MAP mX_)b>iW
} 9 pKm*n&
f'/ KMe%<
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H:}}t]E
//{{AFX_MSG_MAP(CAboutDlg) tW6#e(^l6
// No message handlers \XH@b6{
//}}AFX_MSG_MAP r%MyR8'k]
END_MESSAGE_MAP() -ut=8(6&
0<P(M: a
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +^Jwo)R'b
: CDialog(CCaptureDlg::IDD, pParent) c8Pb
{ X\A]"su
//{{AFX_DATA_INIT(CCaptureDlg) S=9E@(]
m_bControl = FALSE; pDDG_4E>
m_bAlt = FALSE; (KF7zP
m_bShift = FALSE; edN8-P(
m_Path = _T("c:\\"); z[#6-T
&
m_Number = _T("0 picture captured."); H1UL.g%d=
nCount=0; b.Su@ay@(^
bRegistered=FALSE; QWhp:]}
bTray=FALSE; &l^n4
//}}AFX_DATA_INIT $%}>zqD1
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 u8uW9 <
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); YRa4W.&Yn
} ~I)uWo
ZQLB`n@
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `QLowna
{ HD|sr{Z%
CDialog::DoDataExchange(pDX); M7p8^NL
//{{AFX_DATA_MAP(CCaptureDlg) 'wE\{1~_[+
DDX_Control(pDX, IDC_KEY, m_Key); `i4I!E
DDX_Check(pDX, IDC_CONTROL, m_bControl); PJwEA
DDX_Check(pDX, IDC_ALT, m_bAlt); S~&\o\"5
DDX_Check(pDX, IDC_SHIFT, m_bShift); S-,kI
DDX_Text(pDX, IDC_PATH, m_Path); .HOY q
DDX_Text(pDX, IDC_NUMBER, m_Number); G-8n
//}}AFX_DATA_MAP TAAR'Jz S
} g^n;IE$B
@ V5S4E
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Nh :JU?h
//{{AFX_MSG_MAP(CCaptureDlg) >0M:&NMda
ON_WM_SYSCOMMAND() uE"2kn
ON_WM_PAINT() |+mOH#Aty
ON_WM_QUERYDRAGICON() VVN#
$
ON_BN_CLICKED(ID_ABOUT, OnAbout) ]TfeBX6ST
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) B{4"$Mi
ON_BN_CLICKED(ID_CHANGE, OnChange) 3Pa3f >}-
//}}AFX_MSG_MAP r'PE5xqF
END_MESSAGE_MAP() Yoe les-
yHtGp%j
BOOL CCaptureDlg::OnInitDialog() KMe.i'
{ m^Rd Iy)
CDialog::OnInitDialog(); kFnUJM$r
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q%$i@JH`m
ASSERT(IDM_ABOUTBOX < 0xF000); {'&8`d
CMenu* pSysMenu = GetSystemMenu(FALSE); K.r!?cfv
if (pSysMenu != NULL) {;;eOxOP|
{ FcY$k%;'Q
CString strAboutMenu; JN)"2}SE
strAboutMenu.LoadString(IDS_ABOUTBOX); r5Wkc$
if (!strAboutMenu.IsEmpty()) iF+S%aPd#
{ q>c+bo
6
pSysMenu->AppendMenu(MF_SEPARATOR); UT% #K %
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 6J]~A0vsi}
} Z!k5"\{0pE
} pO5v*oONz+
SetIcon(m_hIcon, TRUE); // Set big icon vN'VDvVM
SetIcon(m_hIcon, FALSE); // Set small icon i{4'cdr?
m_Key.SetCurSel(0); Kl!DKeF
RegisterHotkey(); 37,L**Dgs
CMenu* pMenu=GetSystemMenu(FALSE); =CGD
~p`
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); }q/(D?
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v5P*<U Ax
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~ }Kp
return TRUE; // return TRUE unless you set the focus to a control ;cnnqT6
} qW+=g]x\
1+VY><=n
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) G!-7ic_4
{ (cu'
if ((nID & 0xFFF0) == IDM_ABOUTBOX) |qQ{ 8T%)
{ Dg1kbO=2
CAboutDlg dlgAbout; ll 6]W~[ZC
dlgAbout.DoModal(); ^n6)YX
} G* 8+h
else j\%?<2dj=
{ ^mS.HT=X
CDialog::OnSysCommand(nID, lParam); qr7 X-[&
} t$ACQ*O
} Tyg$`\#
&Bj,.dD/a
void CCaptureDlg::OnPaint() />2A<{6\=P
{ ocb%&m;i
if (IsIconic()) Q$/V) 0
{ h[Ndtq>3{
CPaintDC dc(this); // device context for painting tn(?nQN3
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); fho=<|-
// Center icon in client rectangle GhSL%y
int cxIcon = GetSystemMetrics(SM_CXICON); {QIS411
int cyIcon = GetSystemMetrics(SM_CYICON); !V$6+?2
CRect rect; CwTS /G
GetClientRect(&rect); U-wq- GT
int x = (rect.Width() - cxIcon + 1) / 2;
'7S!6kd?
int y = (rect.Height() - cyIcon + 1) / 2; *u:;:W&5y
// Draw the icon ~0'_K1(H
dc.DrawIcon(x, y, m_hIcon); UE}8Rkt
} Jdk3)
\
else bIvJs9L
{ l044c,AW(
CDialog::OnPaint(); BLl%D
} Fi,e}j=2f
} =!1-AR%.^
v#FJ+
HCURSOR CCaptureDlg::OnQueryDragIcon() {<''OwQF~+
{ &KOG[tv
return (HCURSOR) m_hIcon; +cV5h
} sw 3:HNG=
>
{'5>6u
void CCaptureDlg::OnCancel() j?d;xj
{ doxdRYKL
if(bTray) |o; j0
DeleteIcon(); P3,Z5|)
CDialog::OnCancel(); X~IRpzC
} t z
+
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void CCaptureDlg::OnAbout() JxMyeo%gv
{ -z>Z0viA
CAboutDlg dlg; ,T,B0
dlg.DoModal(); []6ShcqJ[v
} Z=e[
!c
41
c^\1
void CCaptureDlg::OnBrowse() =,/A\F
{ !%Z)eO~Z
CString str; CA~em_dC
BROWSEINFO bi; 0x3 h8fs
char name[MAX_PATH]; l1+w2rd1
ZeroMemory(&bi,sizeof(BROWSEINFO)); Q%X:5G?
bi.hwndOwner=GetSafeHwnd(); zezofW]a
bi.pszDisplayName=name; ,N))=/
bi.lpszTitle="Select folder"; 6\)8mK
bi.ulFlags=BIF_RETURNONLYFSDIRS; $~w@0Yl
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 34+)-\ xt:
if(idl==NULL) xy-$v
return; #G[
*2h~99
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G>_42Rp
str.ReleaseBuffer(); (d5vH)+A
m_Path=str; pR@GvweA
if(str.GetAt(str.GetLength()-1)!='\\') -6em*$k^
m_Path+="\\"; @Le ^- v4
UpdateData(FALSE); n !CP_
} t9$AvE#a!=
]sm0E@ 1
void CCaptureDlg::SaveBmp() ?C#F?N0
{ Ul7pxzj
CDC dc; O>b&-U"R
dc.CreateDC("DISPLAY",NULL,NULL,NULL); i SAidK,
CBitmap bm; \U<F\i
int Width=GetSystemMetrics(SM_CXSCREEN); " OS]\-
int Height=GetSystemMetrics(SM_CYSCREEN); #Tg|aW$(*
bm.CreateCompatibleBitmap(&dc,Width,Height); @=MZ6q
CDC tdc; 6>LQGO
tdc.CreateCompatibleDC(&dc);
yv8dfl
CBitmap*pOld=tdc.SelectObject(&bm); "x=@,*Bk
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); npG+#z
tdc.SelectObject(pOld); kERaY9L\
BITMAP btm; n{qw ]/
bm.GetBitmap(&btm); r=P$iG'&
DWORD size=btm.bmWidthBytes*btm.bmHeight; 9`gGsC
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); om*tdG
BITMAPINFOHEADER bih; $Kw"5cm
bih.biBitCount=btm.bmBitsPixel; tx|"v|&e2
bih.biClrImportant=0; mAYr<=
bih.biClrUsed=0; )z4kP09
bih.biCompression=0; hNR>Hy\
bih.biHeight=btm.bmHeight; @$b+~X)7
bih.biPlanes=1; ^$&"<
bih.biSize=sizeof(BITMAPINFOHEADER); i}$N&
bih.biSizeImage=size; 0=(-8vwd
bih.biWidth=btm.bmWidth; W O \lny!
bih.biXPelsPerMeter=0; gne#v
bih.biYPelsPerMeter=0; Z>MJ0J76]
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);
$V {- @=
static int filecount=0; T0np<l]A
CString name; EDa08+Y
name.Format("pict%04d.bmp",filecount++); U7f&N
name=m_Path+name; (Aov}I+
BITMAPFILEHEADER bfh; ;t@ 3Go
bfh.bfReserved1=bfh.bfReserved2=0; %;B(_ht<-w
bfh.bfType=((WORD)('M'<< 8)|'B'); vCU&yXGl
bfh.bfSize=54+size; 1 [~|
bfh.bfOffBits=54; x1hs19s
CFile bf; JG+g88
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Z+"E*
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5x1jLPl'
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ).O2_<&?F
bf.WriteHuge(lpData,size); wJ]$'c3
bf.Close(); ezq
q@t9
nCount++; g)r,q&*
} )/N Xh'
GlobalFreePtr(lpData); xdTzG4
if(nCount==1) dC;d>j,
m_Number.Format("%d picture captured.",nCount); y
4,T
else s$nfY.C
m_Number.Format("%d pictures captured.",nCount); I!0 $%
]F
UpdateData(FALSE); yQA"T?
} EJ
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1r-,VX7
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) x+)hL
D[
n
{ <4A(Z$ZX)
if(pMsg -> message == WM_KEYDOWN) yn ?U7`V
{ !f]3Riw-=,
if(pMsg -> wParam == VK_ESCAPE) [9W&1zY
return TRUE; .n|3A3:
if(pMsg -> wParam == VK_RETURN) Z]> e & N
return TRUE; \8>N<B)
} FUTyx"
return CDialog::PreTranslateMessage(pMsg); hwol7B>
} ?[>BssW
:#!F 7u
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A&_i]o
{ t;a}p_>
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?$8 ,j+&I
SaveBmp(); EpoQV ^Ey
return FALSE; G}hkr
} B8#f^}8
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ v'Py[[R
CMenu pop; ^&w'`-ra
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;uo|4?E:\(
CMenu*pMenu=pop.GetSubMenu(0); UNH}*]u4`
pMenu->SetDefaultItem(ID_EXITICON); Y8CYkJTAD-
CPoint pt; O6/=/-?N=c
GetCursorPos(&pt); 8'_
]gfF
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VTX'f2\
if(id==ID_EXITICON) PQ!?gj
DeleteIcon(); B xN#Nk~
else if(id==ID_EXIT) ABYW1K=
OnCancel(); T6?d`i i1
return FALSE;
6V_5BpXt
} RkXLE"G'
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 'w$we6f
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) apWrcaj
AddIcon(); 1nM?>j%k
return res; j~j
V`>A
} ne~#{q
AxqTPx7`|
void CCaptureDlg::AddIcon() HvfTC<+H
{ F9G$$%Q-Z
NOTIFYICONDATA data; [~r$US
data.cbSize=sizeof(NOTIFYICONDATA); 9lwo/(s
CString tip; $/(/v?3][e
tip.LoadString(IDS_ICONTIP); E6IL,Iq9
data.hIcon=GetIcon(0); WAXrA$:3J
data.hWnd=GetSafeHwnd(); )da8Ru
strcpy(data.szTip,tip); @P*P8v8:
data.uCallbackMessage=IDM_SHELL; ).#D:eO[~
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; R8Ei:f}
data.uID=98; ;og<eK
Shell_NotifyIcon(NIM_ADD,&data); M(f*hOG{Y
ShowWindow(SW_HIDE); / z>8XM&
bTray=TRUE; rO>wX_
} |`9zE]
a{YVz\?d}
void CCaptureDlg::DeleteIcon() I)4|?tb?
{ z&G3&?Z
NOTIFYICONDATA data; bX1! fa
data.cbSize=sizeof(NOTIFYICONDATA); #[rFep
data.hWnd=GetSafeHwnd(); ZFw743G
data.uID=98; @[N~;>
Shell_NotifyIcon(NIM_DELETE,&data); -Y,Ibq
ShowWindow(SW_SHOW); 5UD;ZV%
SetForegroundWindow(); [
^ \)
ShowWindow(SW_SHOWNORMAL); leqSS}KU+
bTray=FALSE; CMf~Yv
} FQ&VM6_
SxQDqoA~
void CCaptureDlg::OnChange() H;}ue
{ C2%3+
RegisterHotkey(); n7<-lQRaxZ
} Xpz-@fqKdf
n6+MqN
BOOL CCaptureDlg::RegisterHotkey() 8pKPbi;(2
{ !Dn1pjxc
UpdateData(); |&*rSp2iH
UCHAR mask=0; IZ ha* 7
UCHAR key=0; T{2//$T?
if(m_bControl) ;Cpm3at
mask|=4; <^$b1<@
if(m_bAlt) GdwHm
mask|=2; gM]/Y6*$b
if(m_bShift) \FX3=WW
mask|=1; ^g"6p#S=n
key=Key_Table[m_Key.GetCurSel()]; ]o[HH_`s@
if(bRegistered){ NY
w(hAPv
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~$9"|
bRegistered=FALSE; $w}aX0dK&
} %ieAY-<"
cMask=mask; m`6`a|Twp$
cKey=key; 5w%9b
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); e/l?|+m 6
return bRegistered; 9GOyVKUv
} _C\
d^a(
Xq$0% WjG
四、小结 c=mFYsSv
-2XIF}.Hu
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。