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:
snW=9b)m
uR:@7n 一、实现方法
b?~%u+'3 37SbF,G 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:
9Un3La8PX :s}6 a23 #pragma data_seg("shareddata")
x=%p~$C HHOOK hHook =NULL; //钩子句柄
\UF/_'=K UINT nHookCount =0; //挂接的程序数目
jBO/1h= static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
uV@#;c4 static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
"Y>
#=>8 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
(pl|RmmDz static int KeyCount =0;
0"vI6Lm static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
"GTlJqhk #pragma data_seg()
_8f?
H#& VT;Vm3\ 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
d*e0/#s d\_$Nb* 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:
*&d>Vk."] Nzo;j0 [ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
%)|pUa& cKey,UCHAR cMask)
ey~5DY7 {
B3j BOOL bAdded=FALSE;
(rHS2SA\5 for(int index=0;index<MAX_KEY;index++){
[f?fA[,[ if(hCallWnd[index]==0){
X(`wj~45VX hCallWnd[index]=hWnd;
);]9M~$ HotKey[index]=cKey;
`k 5'nnyP HotKeyMask[index]=cMask;
J ^y1=PM bAdded=TRUE;
fnwhkL#8 KeyCount++;
~q.a<B`,t break;
9uNkd2# }
kma)DW }
m=hlim;P, return bAdded;
Fbpe`pS+V }
Y M<8>d //删除热键
R0l5"l*@+ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
'K L"i {
n I63Ns BOOL bRemoved=FALSE;
(&W&1KT for(int index=0;index<MAX_KEY;index++){
-8r';zR if(hCallWnd[index]==hWnd){
&7i o/d\/ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
s?:&# hCallWnd[index]=NULL;
5-3.7CO$ HotKey[index]=0;
gyz#:z$p^ HotKeyMask[index]=0;
~`uEZ bRemoved=TRUE;
R-~ZvVw7L KeyCount--;
(SEE(G35 break;
P0B`H7D }
v/fo`]zP }
$y0[AB|V }
k"kGQk4 return bRemoved;
%|tDb }
e6
R<V]g !>,\KxnM /f5*KRM DLL中的钩子函数如下:
Qcy
/)4Hfg LkUYh3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
kXfTNMb {
Q1A_hW2 x BOOL bProcessed=FALSE;
6 cF~8 if(HC_ACTION==nCode)
E=H>|FgS {
uX!5G:x] if((lParam&0xc0000000)==0xc0000000){// 有键松开
*t)Y@=k3> switch(wParam)
J@Qt(rRxi {
\-]zXKl2k case VK_MENU:
?=bqya"Y MaskBits&=~ALTBIT;
'@ $L}C#OI break;
o*[n[\cR case VK_CONTROL:
:"vW;$1
} MaskBits&=~CTRLBIT;
Cggu#//Z}Q break;
/e2CB "c case VK_SHIFT:
^n5rUwS> MaskBits&=~SHIFTBIT;
nE2w? break;
F1Jd-3ei default: //judge the key and send message
fAMk<? break;
#{m~=1%;Ya }
_V.MmA for(int index=0;index<MAX_KEY;index++){
IzuYkl} if(hCallWnd[index]==NULL)
8(6(,WwP} continue;
a7]wPXKq if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
nRE(RbRe {
.qN|.:6a SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
s9Tp(Yr,k bProcessed=TRUE;
""; Bq*Y# }
U9*uXD1\ }
.~nk'm }
y:m
;_U,%c else if((lParam&0xc000ffff)==1){ //有键按下
z(8:7 G switch(wParam)
vuNt+ {
\W,,@- case VK_MENU:
bPlqS+ai_ MaskBits|=ALTBIT;
>l0y
ss)I break;
;ewqGDe'3 case VK_CONTROL:
I)JqaM MaskBits|=CTRLBIT;
ccdP}|9e break;
:Zs i5>MT case VK_SHIFT:
3.t
j%+ MaskBits|=SHIFTBIT;
k%|Sl>{Ir break;
]FQO@y default: //judge the key and send message
]g3RVA%\l break;
5 $vUdDTg }
ep$C
nBwE for(int index=0;index<MAX_KEY;index++){
<T3 v|\6~H if(hCallWnd[index]==NULL)
KBe\)Vs continue;
'{[n,xeR if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A(2\Gfe {
8JFns-5 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<Lt%[dn bProcessed=TRUE;
I1a>w=x!+ }
XK";-7TZt }
=o!1}'1 }} }
dr[sSBTY" if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
?xRx|_}e for(int index=0;index<MAX_KEY;index++){
wm'a)B? if(hCallWnd[index]==NULL)
m\0Xh* continue;
tbH`VD"u if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
3w>S?"W# SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kL7n`o //lParam的意义可看MSDN中WM_KEYDOWN部分
#Ns]l< }
v7h!'U[/ }
=hP7Hea(N }
{\-9^RL return CallNextHookEx( hHook, nCode, wParam, lParam );
H,{WrWA }
k6}M7&nY r*r3QsO 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:
EZY <k# X%Lhu6F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
t)i{=8rq BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
2m*g,J?ql (\I9eBm 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:
&tJ!cTA.- ;!C~_{/t LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
Vq IzDs {
}x9D;%)/ if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
^5GyW`a}
{
}MiEbLduN //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
Jn#05Z SaveBmp();
Z)7|m return FALSE;
C3]"y7 }
YAc~,N …… //其它处理及默认处理
R ^ln-H; }
DH>>u t|5T,YFG %$*WdK# 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。
}3TTtd7 rP7[{'%r 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。
}#<mK3MBe nj(\+l5 二、编程步骤
# h/#h\ %aB
RL6 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";
9K6G% @~+W 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
QyEGK 8k0f&Cak= 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;
QF74' S=@bb$4-T 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
TOx >Z }<9IH%sgF 5、 添加代码,编译运行程序。
] oMtqkiR eJvNUBDSH 三、程序代码
n$u@v(I Q`B K
R]/ ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
mWP1mc:M( #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
'|
6ZPv&N #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
<Rb[0E$ #if _MSC_VER > 1000
&<>NP?j} #pragma once
Dga;GYx #endif // _MSC_VER > 1000
(X3}&aLF #ifndef __AFXWIN_H__
11g_!X -g@ #error include 'stdafx.h' before including this file for PCH
~ubcD6f #endif
v.q`1D1=t #include "resource.h" // main symbols
"T4buTXJ class CHookApp : public CWinApp
|lG7/\A {
J/(^Z?/~P! public:
G(fS__z CHookApp();
b3M`vJ+{ // Overrides
?nCo?A // ClassWizard generated virtual function overrides
w2(pgWed //{{AFX_VIRTUAL(CHookApp)
tZL {;@ public:
nc[Kh8N9 virtual BOOL InitInstance();
Q&@e,7]V+ virtual int ExitInstance();
zAkF:^#Y //}}AFX_VIRTUAL
O}3|UI!` //{{AFX_MSG(CHookApp)
>oGs0mej // NOTE - the ClassWizard will add and remove member functions here.
B'D\l\w // DO NOT EDIT what you see in these blocks of generated code !
Gv+$7{ //}}AFX_MSG
`bJ?8~ 8* DECLARE_MESSAGE_MAP()
k
E},>+W+ };
U^&,xz$Cg LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
k5@PZFV BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
h0oe'Xov BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
|\<L7|hb9 BOOL InitHotkey();
Errs6 BOOL UnInit();
8:sQB%BB #endif
]/6i#fTw =MjkD)l //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
v 1VH&~e #include "stdafx.h"
%nV6#pr #include "hook.h"
}Sr=|j #include <windowsx.h>
AeR*79x #ifdef _DEBUG
@j`gxM_-O #define new DEBUG_NEW
?e#bq] #undef THIS_FILE
=3dR-3 static char THIS_FILE[] = __FILE__;
*w`_(Xf #endif
uefrE53 #define MAX_KEY 100
9-"!v0[' #define CTRLBIT 0x04
tu:W1? #define ALTBIT 0x02
'D:R]@eK] #define SHIFTBIT 0x01
$V\Dl]a1 #pragma data_seg("shareddata")
BA6(Owb HHOOK hHook =NULL;
:%4N4|
Q UINT nHookCount =0;
wec_=EqK0 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
rX}FhBl5 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
(&!RX.i static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
;u*I#)7 static int KeyCount =0;
PSHzB!
H=n static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
?D_^ 8\R #pragma data_seg()
X-y3CO:&@h HINSTANCE hins;
c\le8C3 void VerifyWindow();
i?:#lbw_ BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
@:Emmzucv| //{{AFX_MSG_MAP(CHookApp)
t\XA
JU // NOTE - the ClassWizard will add and remove mapping macros here.
dJF3]h Y // DO NOT EDIT what you see in these blocks of generated code!
E"zC6iYZ; //}}AFX_MSG_MAP
k!"6mo@rd END_MESSAGE_MAP()
[:gp_Z& U62Z ?nge% CHookApp::CHookApp()
{HtW`r1)Tt {
dlRTxb^Y>u // TODO: add construction code here,
.x'?&7#( // Place all significant initialization in InitInstance
-A^o5s }
!Bv.@~ TZ#^AV=ae CHookApp theApp;
EYRg,U&' LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/d*[za'0 {
p5aqlYb6r BOOL bProcessed=FALSE;
$U4[a: if(HC_ACTION==nCode)
Vtv~jJ{m {
]YrgkC35 if((lParam&0xc0000000)==0xc0000000){// Key up
D!V~g72j switch(wParam)
`4-N@h
{
<8ih >s(C case VK_MENU:
U'LPaf$O MaskBits&=~ALTBIT;
RqKkB8g break;
i<{:J -U| case VK_CONTROL:
DEW;0ic MaskBits&=~CTRLBIT;
Q%:Z&lgy break;
-
VdCj%r> case VK_SHIFT:
AfpC >>=@ MaskBits&=~SHIFTBIT;
g=$nNQ
\6= break;
(tCBbPW6T? default: //judge the key and send message
NpH9},1i break;
2 b80b50 }
ny}_^3 for(int index=0;index<MAX_KEY;index++){
:7?n)=Tx if(hCallWnd[index]==NULL)
TF?~vS%@P continue;
"0Z5cQjg if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
Zg9VkL6Z6 {
CT/>x3o SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
5fy{! bProcessed=TRUE;
a$3 ]` }
+E']&v$ }
Z^c\M\`7 }
c-* *~tb( else if((lParam&0xc000ffff)==1){ //Key down
sD$K<nyz switch(wParam)
`LNKbTc[m {
}yaM.+8. case VK_MENU:
N , ,[V
MaskBits|=ALTBIT;
L;=3n[^x break;
>avkiT2 case VK_CONTROL:
OkMAqS MaskBits|=CTRLBIT;
Gi\Z"MiBZ break;
SB`xr!~A] case VK_SHIFT:
P2F8[o!< MaskBits|=SHIFTBIT;
_:>t$*
_ break;
Rh%A^j@ default: //judge the key and send message
L]q%;u]8! break;
0jt@|3 }
dKY#Tl] for(int index=0;index<MAX_KEY;index++)
-^JPY)\R {
A{Qo}F<* if(hCallWnd[index]==NULL)
RG 9iTA' continue;
OQVo4yl" if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
IEe;ygL# {
uANpqT}! SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
n5y0$S/D bProcessed=TRUE;
y+
4#Iy }
-EE}HUP) }
P('bnDU }
h0C>z2iH if(!bProcessed){
d .Q<!Au3 for(int index=0;index<MAX_KEY;index++){
_zkTx7H if(hCallWnd[index]==NULL)
*xN?5u% continue;
+F~B"a if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
m95]
z18T' SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
NU"L1dK
@ }
F_&H*kL L3 }
)d>Dcne }
S0ReT*I return CallNextHookEx( hHook, nCode, wParam, lParam );
OVE?;x>n/1 }
|xT'+~u xyHv7u%* BOOL InitHotkey()
mnx`e>0 {
E)|Bl> if(hHook!=NULL){
$wbIe"| nHookCount++;
ANfy+@ return TRUE;
gX|\O']6 }
l5D4?`| else
6Ilj7m* hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
`NNP}O2 if(hHook!=NULL)
eIOMW9Ivt nHookCount++;
&_-3>8gU return (hHook!=NULL);
mC3:P5/c }
x`I"%pG BOOL UnInit()
03_M+lv {
-C8LM ls if(nHookCount>1){
.*Bd'\:F/q nHookCount--;
NN5G
'|i return TRUE;
wh!8\9{g }
)P,pW?h$ BOOL unhooked = UnhookWindowsHookEx(hHook);
i(*fv(z if(unhooked==TRUE){
+:W? :\ nHookCount=0;
.HRd6O; hHook=NULL;
b;nqhO[f} }
+11 oVW return unhooked;
aimf,(+ }
Asy2jw\V Gyrc~m[$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~6+Um_A_L {
u$X =2u:P BOOL bAdded=FALSE;
-:~z,F for(int index=0;index<MAX_KEY;index++){
uJ8FzS>[V if(hCallWnd[index]==0){
D[6wMep^n hCallWnd[index]=hWnd;
Qz"//=hC|H HotKey[index]=cKey;
MP.ye|i4Q HotKeyMask[index]=cMask;
Z-yoJZi bAdded=TRUE;
D_G]WW8 KeyCount++;
)@] W= break;
:&LV^A }
zy.v[Y1! }
P@x@5uC2 return bAdded;
rDu?XJA }
RRzLQ7J ,Ek6X)|@ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
=LEzcq>XO {
C%j@s| BOOL bRemoved=FALSE;
.y0u"@iF for(int index=0;index<MAX_KEY;index++){
c8HETs1 if(hCallWnd[index]==hWnd){
{hm-0Q if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
$Rn9*OKr hCallWnd[index]=NULL;
ymT]ow6C HotKey[index]=0;
A7eYKo
q HotKeyMask[index]=0;
Q5u3~Q'e bRemoved=TRUE;
}WF6w+ KeyCount--;
Y&y<WN}Q break;
)Y"t$Iw" }
,u!_mV }
jS5K:yx< }
2z1r|?l return bRemoved;
=$ubSfx }
*OHjw;xm+ T+FlN-iy) void VerifyWindow()
(C%qA<6 {
i98PlAq)B for(int i=0;i<MAX_KEY;i++){
2uMSeSx$ if(hCallWnd
!=NULL){ BZjL\{IW
if(!IsWindow(hCallWnd)){ 'b+
Tio
hCallWnd=NULL; ?+$EPaC2
HotKey=0; z5sKV7&\[n
HotKeyMask=0; faZc18M^1
KeyCount--; Xob(4
} O<XNI(@
} v[a4d&P
} 5"+;}E|q
} RhE|0N=
J`wx72/-ZW
BOOL CHookApp::InitInstance() =H^~"16
{ s&DAO r!i
AFX_MANAGE_STATE(AfxGetStaticModuleState()); .tK]-f2
hins=AfxGetInstanceHandle(); Hq,NOP
InitHotkey(); -&QpQ7q1
return CWinApp::InitInstance(); )Rj?\ZUR
} t3!~=U
aDE}'d1qo
int CHookApp::ExitInstance() u0$}VO5/a
{ lO}I>yo}\
VerifyWindow(); '47E8PIJ|
UnInit(); 4*UKR!sr
return CWinApp::ExitInstance(); 7qdB
} 9v7}[`^
K=dG-+B~}
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ,rhNXx
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) xDmwiVy
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vQ{mEaH
#if _MSC_VER > 1000 '9AYE"7Ydk
#pragma once @X_)%Y-^O
#endif // _MSC_VER > 1000 ;|oem\dKv
p
>nKNd_aQ
class CCaptureDlg : public CDialog E FBvi
{ h6D1uM"o
// Construction % "ZC9uq?
public: f^[m~
BOOL bTray; ZrWA,~;
BOOL bRegistered; gyCXv0*z
BOOL RegisterHotkey(); ?nf4K/IjZ!
UCHAR cKey; c2yZvi
UCHAR cMask; K!gocNOf
void DeleteIcon(); s6I/%R3
void AddIcon(); tCu9
D
UINT nCount; Oq95zo
void SaveBmp(); 59(} D'lw>
CCaptureDlg(CWnd* pParent = NULL); // standard constructor z>spRl,dr
// Dialog Data \Pd>$Q
//{{AFX_DATA(CCaptureDlg) U2(mWQ[mO
enum { IDD = IDD_CAPTURE_DIALOG }; 0Rh*SoYrC
CComboBox m_Key; t>"|~T$9
BOOL m_bControl; h9 +76
BOOL m_bAlt; 8ZDWaq8^2N
BOOL m_bShift; IZZ
$p{
CString m_Path; ^i17MvT'
CString m_Number; \~""<*Hz
//}}AFX_DATA g=S|lVQm
// ClassWizard generated virtual function overrides CrX1qyR
//{{AFX_VIRTUAL(CCaptureDlg) ABhQ7
x|
public: Kj|\ALI':
virtual BOOL PreTranslateMessage(MSG* pMsg); 8|rlP
protected: 4HyD=6V#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3:gF4(.
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e{*z4q1
//}}AFX_VIRTUAL <;NxmO<%\
// Implementation 5K$d4KT
protected: .c _qMTm"
HICON m_hIcon; MNKY J
// Generated message map functions a.SxMF
//{{AFX_MSG(CCaptureDlg) SCXtBZ`.G
virtual BOOL OnInitDialog(); wUmcA~3D
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Z]^O=kX7k
afx_msg void OnPaint(); 6am<V]Hw0F
afx_msg HCURSOR OnQueryDragIcon(); 'tq4-11xB
virtual void OnCancel(); 4J2C#Cs
afx_msg void OnAbout(); \xOv 9(
afx_msg void OnBrowse(); '_o(I
afx_msg void OnChange(); 2;YL+v2
//}}AFX_MSG 0u ,nSvch
DECLARE_MESSAGE_MAP() +K"d\<
}; lf2(h4[1R
#endif lkgB,cflpi
6 kAXE\T
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file c]/&xRd
#include "stdafx.h" (Bu-o((N@0
#include "Capture.h" f15n ~d
#include "CaptureDlg.h" :-1
i1d
#include <windowsx.h> (rjv3=9\3
#pragma comment(lib,"hook.lib") F2mW<REg{
#ifdef _DEBUG -2*Pm1\Z
#define new DEBUG_NEW |&rxDf}W
#undef THIS_FILE 'E1m-kJz
static char THIS_FILE[] = __FILE__; YW^sf,zQ
#endif {us"=JJVN
#define IDM_SHELL WM_USER+1 Y kcN-
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3[iHe+U(
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ea?u5$>gY"
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Cb;49;q
class CAboutDlg : public CDialog O `a4
")R
{ EnXTL]=0S
public: Vw b6QIs
CAboutDlg(); "TePO7^m
// Dialog Data Y+_t50S
//{{AFX_DATA(CAboutDlg) PkxhR;4
enum { IDD = IDD_ABOUTBOX }; u6~/"
_FwY
//}}AFX_DATA Y%)@)$sK
// ClassWizard generated virtual function overrides _tpqo>
//{{AFX_VIRTUAL(CAboutDlg) Ct 30EZ
protected: 0^&-j.9
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "A,-/~cBV
//}}AFX_VIRTUAL }`$Sr&n 1
// Implementation |fg{Fpc
protected: ,.&y-?
//{{AFX_MSG(CAboutDlg) g:CMIe4
//}}AFX_MSG \Dr?}D
DECLARE_MESSAGE_MAP() /l$>W<}@
}; <GRrw
x9VR>ux&
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @b"J FB|
{ }o MY
//{{AFX_DATA_INIT(CAboutDlg) O#S27.
//}}AFX_DATA_INIT \t\ZyPxn
} \*k}RKDwT
W4o$J4IX{
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r__Y{&IO
{ x6={)tj
CDialog::DoDataExchange(pDX); .l(t\BfE~
//{{AFX_DATA_MAP(CAboutDlg) *T{P^q.s~[
//}}AFX_DATA_MAP WaYT7 :
} yUzpl[*e^o
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BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DKxzk~sOM
//{{AFX_MSG_MAP(CAboutDlg) l
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// No message handlers }hd:avze
//}}AFX_MSG_MAP aL%amL6CX
END_MESSAGE_MAP() 0755;26Bx
^+20e3 ~Y
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jLu`DKB
: CDialog(CCaptureDlg::IDD, pParent) 3>t^Xu~
{ c3$h-M(jVJ
//{{AFX_DATA_INIT(CCaptureDlg) b 5X~^L
m_bControl = FALSE; $Q cr
m_bAlt = FALSE; i-`n5,
m_bShift = FALSE; KixS)sG
m_Path = _T("c:\\"); io{uN/!X_J
m_Number = _T("0 picture captured."); nR1QS_@{L
nCount=0; x{';0MkUV
bRegistered=FALSE; $<(FZb=
bTray=FALSE; u79,+H@ep
//}}AFX_DATA_INIT !$i*u-%4
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O8drR4Pt
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F qW[L>M'
} _b8?_Zq
k[p7)ec
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @GpM4>:
{ ,>rr|O
CDialog::DoDataExchange(pDX); |_^A$Hv
//{{AFX_DATA_MAP(CCaptureDlg) *$I5_A8,.
DDX_Control(pDX, IDC_KEY, m_Key); ,#FK3;U
DDX_Check(pDX, IDC_CONTROL, m_bControl); C\B&'+uR
DDX_Check(pDX, IDC_ALT, m_bAlt); oS/cS)N20
DDX_Check(pDX, IDC_SHIFT, m_bShift); )d\u_m W^
DDX_Text(pDX, IDC_PATH, m_Path); 9$u'2TV
DDX_Text(pDX, IDC_NUMBER, m_Number); K9YD)351t
//}}AFX_DATA_MAP e)WpqaI
} xA-u%Vf7@
9{;cp?\)M
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) qx $-% P
//{{AFX_MSG_MAP(CCaptureDlg) U?}>A5H
ON_WM_SYSCOMMAND() T7!"gJ
ON_WM_PAINT() >J]^Rgn>
ON_WM_QUERYDRAGICON() H~IN<3ko
ON_BN_CLICKED(ID_ABOUT, OnAbout) RiY9[ec2
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $H9+>Z0(
ON_BN_CLICKED(ID_CHANGE, OnChange) oP$l( k
//}}AFX_MSG_MAP '<A:`V9M}v
END_MESSAGE_MAP() -Tw96 dv
/"Bm1
BOOL CCaptureDlg::OnInitDialog() Aqwjs
3
{ 8%dE$smH
CDialog::OnInitDialog(); >>ncq$
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &3SQVOW ~T
ASSERT(IDM_ABOUTBOX < 0xF000); r
pv`%
CMenu* pSysMenu = GetSystemMenu(FALSE); l.#iMi(@p~
if (pSysMenu != NULL) c3X'Sv
{ =lzRx%tm
CString strAboutMenu; "t-u=aDl-.
strAboutMenu.LoadString(IDS_ABOUTBOX); ndIf1}
if (!strAboutMenu.IsEmpty()) /$
-^k[%
{ |]dA`e&y
pSysMenu->AppendMenu(MF_SEPARATOR); PfaBzi9?f
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~JJuM
} 0'giAA
} Kd?TIeF E
SetIcon(m_hIcon, TRUE); // Set big icon z"b}V01F#
SetIcon(m_hIcon, FALSE); // Set small icon TsPx"+>7`
m_Key.SetCurSel(0); j{i3lGaN
RegisterHotkey(); dPdodjSu,!
CMenu* pMenu=GetSystemMenu(FALSE); V'XmMn)!
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jIq@@8 @o
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z$VA]tI(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); CnJrJ>l
return TRUE; // return TRUE unless you set the focus to a control 9aED6
} tFY;q##z
O>Vb7`z0<
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gy
Jx>i
{ nhfHY-l}7
if ((nID & 0xFFF0) == IDM_ABOUTBOX) /AJ#ngXz
{ y#4f^J!V
CAboutDlg dlgAbout; -R^OYgF
dlgAbout.DoModal(); 7q>Y)*V
} t:DZow
else Hh_Yd)
{ 3yWu-U \k
CDialog::OnSysCommand(nID, lParam); MeXzWLH
} 8X6F6RK6,1
} :x36^{7
0Q81$% @<
void CCaptureDlg::OnPaint() 1Na*7|
{ -6URM`y'j
if (IsIconic()) or?@Ti;
{ %h)6o99{wF
CPaintDC dc(this); // device context for painting J}Q4.1WG$
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); SLzxF uV
// Center icon in client rectangle AY{-Hf&
int cxIcon = GetSystemMetrics(SM_CXICON); -^C't_Q o
int cyIcon = GetSystemMetrics(SM_CYICON); Pc+8CuN?
CRect rect; B0_[bQoc1
GetClientRect(&rect); 6}Se$XMl
int x = (rect.Width() - cxIcon + 1) / 2; O~E6"vQ
int y = (rect.Height() - cyIcon + 1) / 2; k<1BE^[V
// Draw the icon CdxEY
dc.DrawIcon(x, y, m_hIcon); E\3fL"lM
}
X2X.&^
else {fwA=J9%KS
{ C$9+p@G6
CDialog::OnPaint(); 2~:jg1
} LaI(
} 8db J'
L*;XjacI]
HCURSOR CCaptureDlg::OnQueryDragIcon() Who7{|M\'
{ z:RclDm
return (HCURSOR) m_hIcon; XCQS_'D
} /i$-ws-
9}~WwmC|x
void CCaptureDlg::OnCancel() 3kAmRU
{ ~i`@
if(bTray) H+^93
DeleteIcon(); -P|EV|8=
CDialog::OnCancel(); ^%)H;
} q4].C|7
4)'8fi
void CCaptureDlg::OnAbout() G~,K$z/-l
{ bjgf8427I
CAboutDlg dlg; Hwr#
NKz-
dlg.DoModal(); h'{}eYb+
} 3j{VpacZY
d3A= (/>D
void CCaptureDlg::OnBrowse() qT`sPEs;V
{ W$&kOdD!$
CString str; DP2 ^(d<
BROWSEINFO bi; 5O.dRp7dJ
char name[MAX_PATH]; fz%I'+!
ZeroMemory(&bi,sizeof(BROWSEINFO)); Y{].%xM5
bi.hwndOwner=GetSafeHwnd(); yN*HIN
bi.pszDisplayName=name; _%g}d/v}pO
bi.lpszTitle="Select folder"; txF)R[dZK
bi.ulFlags=BIF_RETURNONLYFSDIRS; B{fPj9Y0
LPITEMIDLIST idl=SHBrowseForFolder(&bi); //c<p
if(idl==NULL) Qr`WPTQr"
return; goYRA_%cX
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0\G`AO;D
str.ReleaseBuffer(); n@pm5f
m_Path=str; I]qml2
if(str.GetAt(str.GetLength()-1)!='\\') K6#9HF'2I
m_Path+="\\"; @(XX68
UpdateData(FALSE); uzf@49m]m
} sOc<'):TK
E?c)WA2iH
void CCaptureDlg::SaveBmp() Fs^d-I
{ "%O,*t
CDC dc; TH_Vw,)
dc.CreateDC("DISPLAY",NULL,NULL,NULL); DKV^c'
CBitmap bm; K`!q1g`
int Width=GetSystemMetrics(SM_CXSCREEN); Am~ NBQ7
int Height=GetSystemMetrics(SM_CYSCREEN); #q{i<E 07
bm.CreateCompatibleBitmap(&dc,Width,Height); S~WsGLF s
CDC tdc; O.7Q*^_
tdc.CreateCompatibleDC(&dc); :Jp$_T&E
CBitmap*pOld=tdc.SelectObject(&bm); qaBjV6loy
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 0-
GA,I_
tdc.SelectObject(pOld); gi::?ET/.
BITMAP btm; v:s.V>{"S
bm.GetBitmap(&btm); ?!H<V@a
DWORD size=btm.bmWidthBytes*btm.bmHeight; Lp\89tB>
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]?P9M<0PM
BITMAPINFOHEADER bih; 3}::"X
bih.biBitCount=btm.bmBitsPixel; @kR/=EfS
bih.biClrImportant=0; '</
bih.biClrUsed=0;
9XGzQ45R
bih.biCompression=0; 8fpaY{]
bih.biHeight=btm.bmHeight; |RqCw7
bih.biPlanes=1; S[fzy$">
bih.biSize=sizeof(BITMAPINFOHEADER); VFN\
Ryd
bih.biSizeImage=size; \A`pF'50
bih.biWidth=btm.bmWidth; c nAwoTt4
bih.biXPelsPerMeter=0; /p~Wk4'
bih.biYPelsPerMeter=0; O@U[S.IK
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [3`T/Wm
static int filecount=0; y6KI.LWR9
CString name; l[]K5?AS>-
name.Format("pict%04d.bmp",filecount++); #84pRU~
name=m_Path+name; M 7j0&>NTG
BITMAPFILEHEADER bfh; }a@ZFk_>
bfh.bfReserved1=bfh.bfReserved2=0; DJ"O`qNV3
bfh.bfType=((WORD)('M'<< 8)|'B'); M70X dn
bfh.bfSize=54+size; >j1\]uo
bfh.bfOffBits=54; ]E90q/s@c
CFile bf; ;u LD_1%
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [ 'pk/h
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (80#{4kl
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); h'wOslyFa
bf.WriteHuge(lpData,size); }S6Sz&)
bf.Close(); F,#)8>O
nCount++; tBe)#-O
} Xz5 aTJ&
GlobalFreePtr(lpData); <:yB4t3H+q
if(nCount==1) 6L~@jg~0A[
m_Number.Format("%d picture captured.",nCount); | ]`gps
else P[PBoRd2
m_Number.Format("%d pictures captured.",nCount); )AOD~T4s7
UpdateData(FALSE); #ej^K |Qx
} 0N.tPF}
pYV$sDlD
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .E|Hk,c9
{ ,J?Hdy:R
if(pMsg -> message == WM_KEYDOWN) 2A@9jl s
{ wL,b.]
if(pMsg -> wParam == VK_ESCAPE) tYyva
return TRUE; le`&VdE^
if(pMsg -> wParam == VK_RETURN) ^\ &:'$f+8
return TRUE; +v%V1lf^~
} ABEC{3fWpu
return CDialog::PreTranslateMessage(pMsg); [wl:"rm
} Y4`MgP8t
HbF.doXK
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $DC*&hqpt
{ L'4ob4r{L
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ eSXt"t
SaveBmp(); Okca6=2"
return FALSE; u4B, |_MK
} ,-A8;DW]^J
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ xI'<4lo7Z
CMenu pop; +NPk9jn
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); i](,s.
CMenu*pMenu=pop.GetSubMenu(0); hb9X<N+p
pMenu->SetDefaultItem(ID_EXITICON); +4ax~fuU
CPoint pt; !c:Q+:,H
GetCursorPos(&pt); Q^/5hA
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]9)pFL
if(id==ID_EXITICON) "!XeK| Wi
DeleteIcon(); tA$,4B?
else if(id==ID_EXIT) AY:3o3M
OnCancel(); k|-`d
return FALSE; Ld? tVi
} b].:2
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nL@
"FZ`(
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Vn? %w~0!
AddIcon(); XETY)<g
return res; *x[B g]/
} CmRn
)7=B]{B_
void CCaptureDlg::AddIcon() (w]w
2&YD
{ ]4\^>
NOTIFYICONDATA data; +]
B
data.cbSize=sizeof(NOTIFYICONDATA); lO8.Q"mxo
CString tip; V4qHaG
tip.LoadString(IDS_ICONTIP); 2.}<VivT
data.hIcon=GetIcon(0); ^G=wRtS
data.hWnd=GetSafeHwnd(); y#HD1SZ
strcpy(data.szTip,tip); C=@BkneQ
data.uCallbackMessage=IDM_SHELL; >1a-}>r
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rMSB|*_
data.uID=98; !798%T
Shell_NotifyIcon(NIM_ADD,&data); 9:A>a3KOH
ShowWindow(SW_HIDE); Rp A76ug
bTray=TRUE; C!XI0d
} J"|)?$d]z
MjE.pb
void CCaptureDlg::DeleteIcon() +@]1!|@(
{ \l{*1lQ`
NOTIFYICONDATA data; 0{v?
data.cbSize=sizeof(NOTIFYICONDATA); 9~zh]deH
data.hWnd=GetSafeHwnd(); ogMLv}
data.uID=98; G#5Cyu<r!
Shell_NotifyIcon(NIM_DELETE,&data); t2p/NIn
ShowWindow(SW_SHOW); r4JXbh6Tt
SetForegroundWindow(); )]J I Q"rR
ShowWindow(SW_SHOWNORMAL); |_F-Abk
bTray=FALSE; >tr?5iKxc
} 7t5X
~D@V@sX
void CCaptureDlg::OnChange() N ED`GU
{ f Otrn
RegisterHotkey(); 10}oaL S
} qS&PMQ"$
w?C_LP
BOOL CCaptureDlg::RegisterHotkey() H; TmG<S
{ ="@W)"r
UpdateData(); Ou2H~3^PL
UCHAR mask=0; ;07!^#:L=Q
UCHAR key=0; Lj *FKP\{
if(m_bControl) X$/3
mask|=4; 1a_;[.s
if(m_bAlt) 6xdu}l=%
mask|=2; ;zs*Zd7h M
if(m_bShift) lx$Y-Tb^F
mask|=1; Q)#<T]~=
key=Key_Table[m_Key.GetCurSel()]; `Kym{og
if(bRegistered){ [.6>%G1C
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8S]Mf*~S'
bRegistered=FALSE; MFW?m,It)
} Pdf_{8r
cMask=mask; C^nL{ZP,
cKey=key; ~e{2Y%
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eoEb\zJ
return bRegistered; O b8[P=
} rA`zuYo
M|n)LyL
四、小结 )V@qH]
/4_}wi\
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。