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:
5Dv;-G;
m\O|BMHn 一、实现方法
c2iPm9"eh C\WU<! 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:
13v# C%)Xz #pragma data_seg("shareddata")
6}aH>(3!A HHOOK hHook =NULL; //钩子句柄
X'W8 mqk UINT nHookCount =0; //挂接的程序数目
ck"lX[d1 static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
WUnmUW[/ static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
f#3U,n8: static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
asQXl#4r static int KeyCount =0;
@ a?^2X^ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
K9 tuiD+j #pragma data_seg()
EX.`6,:+2 (ev(~Wc 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。
alB[/.1 vsU1Lzna6@ 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:
(g>>
+>,4d BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
TtZ
'~cGR cKey,UCHAR cMask)
~ d!F|BH4 {
(&y~\t]H BOOL bAdded=FALSE;
]IZn#gnM for(int index=0;index<MAX_KEY;index++){
',<Bo{ if(hCallWnd[index]==0){
zLB7'7oP hCallWnd[index]=hWnd;
X\dPQwasM HotKey[index]=cKey;
7Ne`F(c HotKeyMask[index]=cMask;
8ezdU" bAdded=TRUE;
Rl2*oOVz KeyCount++;
28N
v' break;
3TS(il9A }
;E{k+vkqy }
j>KJgSs]&\ return bAdded;
V7\@g }
qbwX*E~; //删除热键
'@epiF& BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
J4Tc q {
RIDzNdM>U BOOL bRemoved=FALSE;
<E`Ygac for(int index=0;index<MAX_KEY;index++){
,( ?q if(hCallWnd[index]==hWnd){
QlmZ4fT[r if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
r?l7_aBv3 hCallWnd[index]=NULL;
D0 f.XWd HotKey[index]=0;
NWt `X! HotKeyMask[index]=0;
(6*CORE
bRemoved=TRUE;
.*bu:FuDE KeyCount--;
MI,b`pQ break;
8LMO2Wyq }
uIO<6p) }
}{(dG7G+ }
1oSrhUTy return bRemoved;
$%3"@$ }
nhm)P_p ? V0!N; y]veqa DLL中的钩子函数如下:
PDEeb.(. !&n'1gJ)kd LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{ vf"`#Q9 {
`~hB-Z5dI BOOL bProcessed=FALSE;
/7)l 22< if(HC_ACTION==nCode)
kX2bU$1Q,i {
i#lnSJ08 if((lParam&0xc0000000)==0xc0000000){// 有键松开
~_ 8X%uty switch(wParam)
])sIQ{P {
C " W, case VK_MENU:
b,8\i|*!f MaskBits&=~ALTBIT;
`=zlS"dQ
break;
gC+PpY#2h case VK_CONTROL:
?Bdhn{_ MaskBits&=~CTRLBIT;
z~S(OM@olJ break;
b85r=tm case VK_SHIFT:
^bZ'z MaskBits&=~SHIFTBIT;
mYy{G s7 break;
ey~5DY7 default: //judge the key and send message
Lcx)wof break;
(rHS2SA\5 }
Bv)^GU& for(int index=0;index<MAX_KEY;index++){
X(`wj~45VX if(hCallWnd[index]==NULL)
);]9M~$ continue;
Cmsg'KqqT if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
J ^y1=PM {
IYo{eX~= SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
=u5a'bp0;; bProcessed=TRUE;
9uNkd2# }
kma)DW }
Qrnc;H9) }
!Rq.L else if((lParam&0xc000ffff)==1){ //有键按下
v|WT m# switch(wParam)
[T(XwA) {
gtV^6(Y case VK_MENU:
?51Y&gOEZ MaskBits|=ALTBIT;
OVo3. break;
n I63Ns case VK_CONTROL:
(&W&1KT MaskBits|=CTRLBIT;
C [Ap&S break;
~^{jfHTlv case VK_SHIFT:
5-3.7CO$ MaskBits|=SHIFTBIT;
gyz#:z$p^ break;
~`uEZ default: //judge the key and send message
C3XB'CL6 break;
[%);N\o2Y }
7<T1#~w4L for(int index=0;index<MAX_KEY;index++){
Q=,6W:j if(hCallWnd[index]==NULL)
R7q\^Yzo continue;
vG{+}o# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,u:J"epM {
&tAhRMa SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
<K(qv^C bProcessed=TRUE;
f6I$d< }
Qcy
/)4Hfg }
kgq"b) }
y.O% if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
<?Z [X{ for(int index=0;index<MAX_KEY;index++){
m ll-cp if(hCallWnd[index]==NULL)
b.LMJ'1 continue;
&zxqVI$4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
IpJMq^Z SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
l8XgzaW //lParam的意义可看MSDN中WM_KEYDOWN部分
p>g5WebBN }
4P406,T]r }
[eWZ^Eh"I }
VIXY?Ua return CallNextHookEx( hHook, nCode, wParam, lParam );
e={X{5z0 }
xzZ2?zWi Tuk::
.jD 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:
bvxol\7 ; @d+NeS BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
X6hp} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
Skbd'j Ke*tLnO 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:
qM$4c7'4P6 nRE(RbRe LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
.qN|.:6a {
Yq$KYB j if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
<r@w`G {
xF#'+Y //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
H n^)Xw
SaveBmp();
*&=sL return FALSE;
u . xUM }
sbju3nvk …… //其它处理及默认处理
W<QMUu }
q)m0n237P RjcU0$Hi )U?5O$M;lE 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。
-E$(<Pow~\ ?g6xy[ 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
=ObI 3Uy4 8ue 二、编程步骤
1 +0-VRl >8*0"Q 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
ef Moi 'v l\HLlwYO 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
O<RLw)nzg NMM$
m!zg 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;
K&\
q6bU ,:E*Mw: 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;
__3s3YG mSg{0_: 5、 添加代码,编译运行程序。
}Ai_peO0a uZg[PS=@!X 三、程序代码
L&I8lG I*SrKZb ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Un~8N #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
$ #*";b)QY #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
C8xx R~mq #if _MSC_VER > 1000
\~r`2p-K #pragma once
Cwh*AKq( #endif // _MSC_VER > 1000
o4zX
41W #ifndef __AFXWIN_H__
1Z h4)6x #error include 'stdafx.h' before including this file for PCH
^%qe&Pe2 #endif
:pp@x*uNP #include "resource.h" // main symbols
~\{a<-R class CHookApp : public CWinApp
ki8;:m4 {
fK0VFN8<I public:
R [[
#r5q CHookApp();
]RvFn~E!s // Overrides
$$5E+UDOs // ClassWizard generated virtual function overrides
Ik\n/EE //{{AFX_VIRTUAL(CHookApp)
Z]QpH<Z public:
'&;s32']} virtual BOOL InitInstance();
oy _DYop virtual int ExitInstance();
xnR;#Yc //}}AFX_VIRTUAL
y37c&XYq //{{AFX_MSG(CHookApp)
NKSK+ll2 // NOTE - the ClassWizard will add and remove member functions here.
;UAi>//# // DO NOT EDIT what you see in these blocks of generated code !
gfW_S&&q //}}AFX_MSG
UGb<&) DECLARE_MESSAGE_MAP()
cm'`u&S };
1Mtm?3Pt LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
AW R BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
ROWI.| BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
UA8*8%v BOOL InitHotkey();
B1U<m=Y BOOL UnInit();
sU=7)*$ #endif
ZHN@&Gg6) Zw`9B //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
\se
/2l #include "stdafx.h"
MmbS["A #include "hook.h"
Fmd^9K #include <windowsx.h>
!1b4q/ #ifdef _DEBUG
?=dp]E{ #define new DEBUG_NEW
MB!_G[R
#undef THIS_FILE
[wO|P{8\" static char THIS_FILE[] = __FILE__;
na4^>:r~ #endif
u^ 3,~:E #define MAX_KEY 100
eVetG,[" #define CTRLBIT 0x04
'Zket=Sm; #define ALTBIT 0x02
r3BQo[ 't #define SHIFTBIT 0x01
Qf
.ASC #pragma data_seg("shareddata")
,O'#7Dj HHOOK hHook =NULL;
<NYf !bx UINT nHookCount =0;
0DB8[#i%: static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
"G[yV>pxv static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
[Nw%fuB static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
wyi%!H static int KeyCount =0;
9sI&&Jg static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
i[#XYX'\ #pragma data_seg()
d$gT,+|vu HINSTANCE hins;
#GbfFoE void VerifyWindow();
nkxv,_)ZT BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
"8#EA<lsS //{{AFX_MSG_MAP(CHookApp)
F*, e,s // NOTE - the ClassWizard will add and remove mapping macros here.
|nMg.t`8 // DO NOT EDIT what you see in these blocks of generated code!
yP^C) //}}AFX_MSG_MAP
T1\@4x END_MESSAGE_MAP()
O!U8"Yr$ 99YgQ Y]HO CHookApp::CHookApp()
{2v,J]v_[ {
Ds<~JfVl // TODO: add construction code here,
+I>V9%%vW_ // Place all significant initialization in InitInstance
$[xS>iuD }
Mjj5~by: Pl\r|gS; CHookApp theApp;
5@-[[ $dk LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
!K %8tr4 {
xW.~Jt BOOL bProcessed=FALSE;
_)%Sz"g^Ix if(HC_ACTION==nCode)
.ED8b5t| {
A?+0Ce&qL if((lParam&0xc0000000)==0xc0000000){// Key up
WcOnv'l, switch(wParam)
+.2OZ3( {
Q^{XM case VK_MENU:
7@NV|Idtd MaskBits&=~ALTBIT;
/Pyj|!C3`q break;
!zZ3F|+HB case VK_CONTROL:
8 t5o&8v MaskBits&=~CTRLBIT;
-FGM>~x break;
/7fD;H^* case VK_SHIFT:
'5xvR G MaskBits&=~SHIFTBIT;
g@ 2f&m break;
M->BV9 default: //judge the key and send message
L']"I^(N break;
&`%J1[dy }
bn#'o(Lp for(int index=0;index<MAX_KEY;index++){
2/>u8j if(hCallWnd[index]==NULL)
F.cKg~E|e continue;
WdZ_^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
]k#iA9I {
eD,'M SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
oiTSpd- bProcessed=TRUE;
h3rVa6cxM }
QF4)@ r{2x }
Aryp!oW }
?P%-p else if((lParam&0xc000ffff)==1){ //Key down
BS|$-i5L switch(wParam)
HDYWDp {
$z[@DB[ case VK_MENU:
;u*I#)7 MaskBits|=ALTBIT;
%:!ILN break;
2)MX<prH case VK_CONTROL:
?D_^ 8\R MaskBits|=CTRLBIT;
E;rS"'D: break;
c\le8C3 case VK_SHIFT:
i?:#lbw_ MaskBits|=SHIFTBIT;
@:Emmzucv| break;
t\XA
JU default: //judge the key and send message
dJF3]h Y break;
E"zC6iYZ; }
k!"6mo@rd for(int index=0;index<MAX_KEY;index++)
\#!B*:u {
U62Z ?nge% if(hCallWnd[index]==NULL)
*_sSM+S continue;
dlRTxb^Y>u if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.x'?&7#( {
-A^o5s SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
jRN>^Ur;g bProcessed=TRUE;
f=IF_|@^S }
+yI2G!
$T9 }
@+7CfvM }
q|sT4}
= if(!bProcessed){
T"/dn%21 for(int index=0;index<MAX_KEY;index++){
qs>&Xn if(hCallWnd[index]==NULL)
GDQQ4-|O continue;
&>xz if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
k![oJ.vHD SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
9T_fq56Oh6 }
rtdEIk }
RpwDOG }
eX$RD9
H return CallNextHookEx( hHook, nCode, wParam, lParam );
kD
me>E= }
t\WU}aKML ~~3*o BOOL InitHotkey()
b#(X+I {
tTbfyI if(hHook!=NULL){
9I [k3 nHookCount++;
rV
fZ_\| return TRUE;
O$7cN\Z }
>zfFvx_q else
*Ksk1T+> hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
'<U4D if(hHook!=NULL)
pv,z$3Q nHookCount++;
B:VGa<lx5 return (hHook!=NULL);
=wMq!mBd }
&S39SV BOOL UnInit()
I23"DBR3 {
Gc_KS'K@$ if(nHookCount>1){
uN=f(-" nHookCount--;
v ty:@?3\ return TRUE;
.cz7jD
}
wpD}#LRfm BOOL unhooked = UnhookWindowsHookEx(hHook);
eExI3"|Q if(unhooked==TRUE){
x^Zm:Jrw~ nHookCount=0;
s&iu+> hHook=NULL;
kkIG{Bw }
K!8l!FFl return unhooked;
pf&U$oR4 }
i_:#][nWX p2
!w86 F BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>*EJ6FPO {
$ I
J^ BOOL bAdded=FALSE;
X!6$<8+1OV for(int index=0;index<MAX_KEY;index++){
deEc;IAo if(hCallWnd[index]==0){
b!qlucAeE hCallWnd[index]=hWnd;
?e\u_3-9 HotKey[index]=cKey;
PPde!}T$ HotKeyMask[index]=cMask;
kDG?/j90D bAdded=TRUE;
XUA%3Xr KeyCount++;
Ya}}a break;
a@-bw4SD }
T^ - - :1 }
,<$rSvMfg return bAdded;
}:S}jo7 }
;B!p4hu %{jL+4veoL BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
nG$+9}\UlP {
)<$<9!L4x BOOL bRemoved=FALSE;
<Ira~N for(int index=0;index<MAX_KEY;index++){
Z&n#*rQ7[ if(hCallWnd[index]==hWnd){
|Yv,zEY) if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
l=L(pS3 ~ hCallWnd[index]=NULL;
V`rxjv}! HotKey[index]=0;
e?N3&ezp HotKeyMask[index]=0;
Z4g<Ys* bRemoved=TRUE;
xwj{4fzpk{ KeyCount--;
`)>}b 3 break;
0./Rdf=-1j }
iI;np+uYk }
hW` o-' }
,hZ?]P& return bRemoved;
y(O~=S+< }
wScr:o+K>L wEw;],ur void VerifyWindow()
B>[myx {
^\r{72!y for(int i=0;i<MAX_KEY;i++){
ikO9p|J if(hCallWnd
!=NULL){ ANfy+@
if(!IsWindow(hCallWnd)){ iu$Y0.H@
hCallWnd=NULL; _YN
C}PUU
HotKey=0; g9Ty%|Q7(
HotKeyMask=0; c<sq0('`
KeyCount--; 8T8]g M
} PAH#yM2Ic
} =}0$|@pl
}
e'p"gX
}
&_-3>8gU
Sbeq%Iwm.
BOOL CHookApp::InitInstance() :\C/mT3xL)
{ h+S]C#X,}
AFX_MANAGE_STATE(AfxGetStaticModuleState()); "N)InPR-
hins=AfxGetInstanceHandle(); YxGqQO36
InitHotkey(); _UY=y^ c0>
return CWinApp::InitInstance(); 4O:HT m
} 7X>*B~(R
DcG=u24Xy!
int CHookApp::ExitInstance() \Y`psSf+
{ Ua4P@#cU
VerifyWindow(); :
@$5M
UnInit(); $LG.rJ/*
return CWinApp::ExitInstance(); ENI|e,'[
} |XMWi/p
iBmvy7S?
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8"A0@fNz
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +11 oVW
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ KUC%Da3
#if _MSC_VER > 1000 "rVM23@
tq
#pragma once Asy2jw\V
#endif // _MSC_VER > 1000 D={$l'y9p
*?VB/yO=0
class CCaptureDlg : public CDialog ~6+Um_A_L
{ c:+UC
// Construction H%Z;Yt8^gt
public: HBs
6:[q
BOOL bTray; qIB2eCXw
BOOL bRegistered; ,1]VY/
BOOL RegisterHotkey(); ;9q$eK%d
UCHAR cKey; /O`R9+;
UCHAR cMask; @Fzw_qr
M
void DeleteIcon(); @jq H8
void AddIcon(); GIfs]zVr`
UINT nCount; Z-yoJZi
void SaveBmp(); 5kA D vi.
CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5DO}&%.xt
// Dialog Data !)}D_9{
//{{AFX_DATA(CCaptureDlg) 1:_}`x=hM
enum { IDD = IDD_CAPTURE_DIALOG }; er2;1TW3E
CComboBox m_Key; }:[MSUm5
BOOL m_bControl; O&}R
BOOL m_bAlt; %d<UMbS^
BOOL m_bShift; LR'~:46#u
CString m_Path; ,Ek6X)|@
CString m_Number; WI.+9$1:P
//}}AFX_DATA %IDl+_j
// ClassWizard generated virtual function overrides (`u+(M!^
//{{AFX_VIRTUAL(CCaptureDlg) .4[M-@4+]
public: /||8j.Tm
virtual BOOL PreTranslateMessage(MSG* pMsg); = )4bf"~8
protected: 8#9OSupp
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "{3MXAFe
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;Wsl 'e/
//}}AFX_VIRTUAL ]\]mwvLT
// Implementation ymT]ow6C
protected: .'4@Yp{=
HICON m_hIcon;
A7eYKo
q
// Generated message map functions [?(qhp!
//{{AFX_MSG(CCaptureDlg) 2wgcVQ
Awa
virtual BOOL OnInitDialog(); 1_StgFu u
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); \&U"7gSL
afx_msg void OnPaint();
bjN"H`Q
afx_msg HCURSOR OnQueryDragIcon(); 8ZJ6~~h
virtual void OnCancel(); Z=<D`
afx_msg void OnAbout(); K6@ %@v
afx_msg void OnBrowse(); FI)0.p
afx_msg void OnChange(); !!mGsgnW
//}}AFX_MSG F5M{`:/
DECLARE_MESSAGE_MAP() 8%xiHPVg
}; ~H"-km"@
#endif ey\(*Tu9
?,C'\8'
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O* )BJOPa
#include "stdafx.h" Zm(}~C29
#include "Capture.h" Uo[`AzD3
#include "CaptureDlg.h" ]iZ-MG)J
#include <windowsx.h> Q8h=2YL
#pragma comment(lib,"hook.lib") 9WHarv2 @
#ifdef _DEBUG ]eX(K5 A
#define new DEBUG_NEW [|YJg]i-
#undef THIS_FILE H>"P]Y)oX
static char THIS_FILE[] = __FILE__; wy:euKB~
#endif ?ZkVk =t?
#define IDM_SHELL WM_USER+1 `8TL*.9
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E~8J<gE
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z5sKV7&\[n
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -qLNs_
_k
class CAboutDlg : public CDialog Jq+@%#G
{ @[n%q.|VB
public: EJJ&`,q
CAboutDlg(); B*^QTJ
// Dialog Data L:jv%;DM
//{{AFX_DATA(CAboutDlg) N]GF>kf:
enum { IDD = IDD_ABOUTBOX }; cCIs~*D
//}}AFX_DATA +!G)N~o
// ClassWizard generated virtual function overrides MW=rX>tE
//{{AFX_VIRTUAL(CAboutDlg) J`wx72/-ZW
protected: U;gy4rj
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support k_Lv\'Ok
//}}AFX_VIRTUAL HDz"i
// Implementation 9'KOc5@l^
protected: =S\pI
//{{AFX_MSG(CAboutDlg) :z$+leNH\
//}}AFX_MSG 8P&z@E{y
DECLARE_MESSAGE_MAP() Qr?(2t#
}; 0.1?hb|p5T
6*I=%
H|
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) q@Zeu\T,*#
{ nzU0=w}V
//{{AFX_DATA_INIT(CAboutDlg) 59?$9}ob
//}}AFX_DATA_INIT 9FF
} ^a#W|-:
4hn'b[
void CAboutDlg::DoDataExchange(CDataExchange* pDX) RVpo,;:
{ a!PN`N28
CDialog::DoDataExchange(pDX); } OkK@8?0O
//{{AFX_DATA_MAP(CAboutDlg) /EL3Tt
//}}AFX_DATA_MAP ?Uhjyi
} 9v7}[`^
>-(,BfZ
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2F ~SH
//{{AFX_MSG_MAP(CAboutDlg) ,rhNXx
// No message handlers :r&4/sN}<
//}}AFX_MSG_MAP V<d`.9*}
END_MESSAGE_MAP() 'jKCAU5/0;
|;YDRI
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +V#dJ[,8;.
: CDialog(CCaptureDlg::IDD, pParent) / 6DW+!
{ n5*m x7
//{{AFX_DATA_INIT(CCaptureDlg) _ n4C~
m_bControl = FALSE; E FBvi
m_bAlt = FALSE; qc6d,z/
m_bShift = FALSE; Qaiqx"x3
m_Path = _T("c:\\"); =DI/|^j{;
m_Number = _T("0 picture captured."); ;]2d%Qt
nCount=0; Nh6!h%
bRegistered=FALSE; a3:1`c/~\
bTray=FALSE; IN"6=2:
//}}AFX_DATA_INIT dAjm4F-
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q*/jQC
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5"Y:^_8
} hP
jL
o7yvXrpG(U
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~VPE9D@
{ `L.nj6F
CDialog::DoDataExchange(pDX); Sqla+L*
//{{AFX_DATA_MAP(CCaptureDlg)
_,*QJ
DDX_Control(pDX, IDC_KEY, m_Key); #?bOAWAwLh
DDX_Check(pDX, IDC_CONTROL, m_bControl); 2*zMLI0.
DDX_Check(pDX, IDC_ALT, m_bAlt); nB%[\LtZ?
DDX_Check(pDX, IDC_SHIFT, m_bShift); >< Qp%yT
DDX_Text(pDX, IDC_PATH, m_Path); IpVtbDW
DDX_Text(pDX, IDC_NUMBER, m_Number); U@)WTH6d
//}}AFX_DATA_MAP _147d5
} CW~c<,"
}`uq:y
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RNX>I,2sh
//{{AFX_MSG_MAP(CCaptureDlg) g<i>252>
ON_WM_SYSCOMMAND() [ _&z+
ON_WM_PAINT() 2c5)pIVEy
ON_WM_QUERYDRAGICON() 8ZDWaq8^2N
ON_BN_CLICKED(ID_ABOUT, OnAbout) !:1BuiL
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) F>5)Clq
ON_BN_CLICKED(ID_CHANGE, OnChange) "T6s;'k
//}}AFX_MSG_MAP p%e/>N.P
END_MESSAGE_MAP() a,[NcdG
N\x<'P4q
BOOL CCaptureDlg::OnInitDialog() P)UpUMt;k
{ l, j0n0h.
CDialog::OnInitDialog(); J8DKia|h(
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); smuQ1.b
ASSERT(IDM_ABOUTBOX < 0xF000); @Sz7*p
CMenu* pSysMenu = GetSystemMenu(FALSE); ,L8(Vo`-
if (pSysMenu != NULL) Ewo6Q){X
{ gq)uv`3
CString strAboutMenu; R78lV-};Q
strAboutMenu.LoadString(IDS_ABOUTBOX); ;-kg3fGB1Q
if (!strAboutMenu.IsEmpty()) alZ83^YN'
{ YU1z\pK
pSysMenu->AppendMenu(MF_SEPARATOR); f7 zGz
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); aOW$H:b
} 5K$d4KT
} sH Hu<[psM
SetIcon(m_hIcon, TRUE); // Set big icon vNAQ/Q
SetIcon(m_hIcon, FALSE); // Set small icon MNKY J
m_Key.SetCurSel(0); #vT~D>zj
RegisterHotkey(); R"e53 3
CMenu* pMenu=GetSystemMenu(FALSE); ;x4yidb6
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Njs'v;-K
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4zf(
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); n*N`].r#{=
return TRUE; // return TRUE unless you set the focus to a control \p J<@
} 6am<V]Hw0F
2B]mD-~
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +InFv"wt
{ qApf\o3[0
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Oa7jLz'i
{ uq@_DPA7
CAboutDlg dlgAbout; HQrx9CXE
dlgAbout.DoModal(); _MUSXB'
} Qx77%L4
else vi0nJ -Xg
{ N`5
mPE
CDialog::OnSysCommand(nID, lParam); wmFS+F4`2
} FJ O-p
} Iz I
hC
lkgB,cflpi
void CCaptureDlg::OnPaint() A)D1
#,0
{ Us8nOr>5
if (IsIconic()) ?) VBkA5j
{ l~GcD
CPaintDC dc(this); // device context for painting 6"jV>CNc@
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); AM4
:xz
// Center icon in client rectangle :Pi="
int cxIcon = GetSystemMetrics(SM_CXICON); I sB=G-s
int cyIcon = GetSystemMetrics(SM_CYICON); );ZxKGjc4
CRect rect; i
M!=/
GetClientRect(&rect); MH_3nN
int x = (rect.Width() - cxIcon + 1) / 2; uJL[m(G
int y = (rect.Height() - cyIcon + 1) / 2; qbQH1<yS<
// Draw the icon Np R&`]
dc.DrawIcon(x, y, m_hIcon); hSSFmEpr
} -Sj|Y}
else DsGtc<l%
{ -Deqlaf(
CDialog::OnPaint(); 7cZ(g dQ/
} 3[iHe+U(
} ~_"/\;1
mO^vKq4r.
HCURSOR CCaptureDlg::OnQueryDragIcon() ~Z
x_"
{ _9"%;:t
return (HCURSOR) m_hIcon;
$oH?7sj
} of?'FrU
?h'd\.j{
void CCaptureDlg::OnCancel() FFID<Lf/2
{ ?-9It|R
if(bTray) 0o-KjX?kP
DeleteIcon(); qX!P:M
CDialog::OnCancel(); .06[*S
} |1^
!rHg
kY`L[1G$
void CCaptureDlg::OnAbout() _0qp!-l}
{ DsF<P@O6
CAboutDlg dlg; lAx^!#~\
dlg.DoModal(); L:RMZp*bK
} KJN{p~Q
e'1}5Ky
void CCaptureDlg::OnBrowse() Ra^GbT|Z
{ nn6&`$(Q~
CString str; c*`=o(S
BROWSEINFO bi; 0?8{q{ o+
char name[MAX_PATH]; >TZyax<:
ZeroMemory(&bi,sizeof(BROWSEINFO)); = $awUy
bi.hwndOwner=GetSafeHwnd(); g:CMIe4
bi.pszDisplayName=name; e khx?rz
bi.lpszTitle="Select folder"; X\'+);Z
bi.ulFlags=BIF_RETURNONLYFSDIRS; Kq2,J&Ca3
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^%k[YJtB=i
if(idl==NULL) KcNh3CR
return; V<G=pPC'H
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $&[}+??
str.ReleaseBuffer(); k\wI^D
m_Path=str; @EzO
bE{
if(str.GetAt(str.GetLength()-1)!='\\') *S=zJyAO
m_Path+="\\"; O#S27.
UpdateData(FALSE); gN/6%,H}
} 8.4+4Vxh
.@(9v.:_u
void CCaptureDlg::SaveBmp() W=@]YI
{ <hSrx7o
CDC dc; zeG_H}[2&
dc.CreateDC("DISPLAY",NULL,NULL,NULL); D "9Hv3
CBitmap bm; gl~>MasV&
int Width=GetSystemMetrics(SM_CXSCREEN); .l(t\BfE~
int Height=GetSystemMetrics(SM_CYSCREEN); Ud[Zv?tA:
bm.CreateCompatibleBitmap(&dc,Width,Height); \w\{x0u
CDC tdc; a}MSA/K(
tdc.CreateCompatibleDC(&dc); ^+zhzfJ
CBitmap*pOld=tdc.SelectObject(&bm); 6+Wkcrh
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ]Sgc42hk
tdc.SelectObject(pOld); Foc) u~
BITMAP btm; j^'op|l
bm.GetBitmap(&btm); /K<.$B8
DWORD size=btm.bmWidthBytes*btm.bmHeight; UuvI?D
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); LU4k/
BITMAPINFOHEADER bih; 9>na3ISh
bih.biBitCount=btm.bmBitsPixel; +Pm
yFJH
bih.biClrImportant=0; \5s#9
bih.biClrUsed=0; KZ;Q7 1
bih.biCompression=0; |VRzIA4M\
bih.biHeight=btm.bmHeight; *Af:^>mh
bih.biPlanes=1; [exIK
bih.biSize=sizeof(BITMAPINFOHEADER); jLu`DKB
bih.biSizeImage=size; K}p!W"!o
bih.biWidth=btm.bmWidth; &E&e5(&$
bih.biXPelsPerMeter=0; 8Qt'Y9|
bih.biYPelsPerMeter=0; cy-Bhk0H
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1"5-doo
static int filecount=0; R"`7aa6
CString name; wa*/Am9;~
name.Format("pict%04d.bmp",filecount++); 5??\[C^"}
name=m_Path+name; l3C%`[MB
BITMAPFILEHEADER bfh; "=97:H{!
bfh.bfReserved1=bfh.bfReserved2=0; OPsg3pW!]
bfh.bfType=((WORD)('M'<< 8)|'B'); =Vm"2g,aA
bfh.bfSize=54+size; PA(XdT{
bfh.bfOffBits=54; #- hYjE5
CFile bf; 1IRlFC
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ g-Y2U}&
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); U,w J8
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5s'oVO*hW
bf.WriteHuge(lpData,size); {q-<1|xj/J
bf.Close(); "Wz#<! .r
nCount++; . w_oW mD
} }+fMYgw
GlobalFreePtr(lpData); R|Lr@k{6+r
if(nCount==1) 05cyWg9a
m_Number.Format("%d picture captured.",nCount); J<4egk4
else oSOO5dk:z
m_Number.Format("%d pictures captured.",nCount); xF4>D!T%8
UpdateData(FALSE); tgP x!5U
} Rr|&~%#z
{:;599l
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *$I5_A8,.
{ D+ )R_
if(pMsg -> message == WM_KEYDOWN) =E?!!EIq.
{ |E YJbL;1%
if(pMsg -> wParam == VK_ESCAPE) ]'2;6%.4
return TRUE; LK1 r@
if(pMsg -> wParam == VK_RETURN) VdZmrq;?/
return TRUE; 8>
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} o"a~
return CDialog::PreTranslateMessage(pMsg); ?zD?-
} {T0f]]}Q
?!:$Z4G
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '9Hah
{ IP]"D"
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 8 N5ga
SaveBmp(); Q8kdX6NMd&
return FALSE; xA-u%Vf7@
} Wp[R$/uT
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &Q85B q
CMenu pop; eKq`t.*Ft
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qx $-% P
CMenu*pMenu=pop.GetSubMenu(0); k9ThWo/#u
pMenu->SetDefaultItem(ID_EXITICON); K38A;=t9
CPoint pt; T7!"gJ
GetCursorPos(&pt); EN =oA P
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0=2D90
if(id==ID_EXITICON) ;%_fQNFb
DeleteIcon(); ,(6U3W*bu
else if(id==ID_EXIT) J4-64t nZ
OnCancel(); zdoJ+zRtK
return FALSE; xsPE UK&g
} oP$l( k
LRESULT res= CDialog::WindowProc(message, wParam, lParam); J4Ix\r_
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $cxulcay=
AddIcon(); eco i4f
return res; i+2fWi6Z+
} MMZdF{5@G
sMq*X^z
)?
void CCaptureDlg::AddIcon() ;!JI$_-\
{ ~e,D`Lv
NOTIFYICONDATA data; i9qn_/<c
data.cbSize=sizeof(NOTIFYICONDATA); =-r[ s%t&
CString tip; yH'vhtop
tip.LoadString(IDS_ICONTIP); 8e`'Ox_5a
data.hIcon=GetIcon(0); {p{TG5rwX
data.hWnd=GetSafeHwnd(); G8y:f%I!b
strcpy(data.szTip,tip); YR2Q6}xR
data.uCallbackMessage=IDM_SHELL; 1q])"l"<
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <F=U(WWn9
data.uID=98; 3=reN6Q
Shell_NotifyIcon(NIM_ADD,&data); thYG1Cs
ShowWindow(SW_HIDE); E0miX)AG
bTray=TRUE; H>x(c|ZBp
} .KA){_jBp
#sn2Vmi
void CCaptureDlg::DeleteIcon() ! f\q0Gnl
{ SA| AS<
NOTIFYICONDATA data; N6"b
OxJ(
data.cbSize=sizeof(NOTIFYICONDATA);
Fo=hL
data.hWnd=GetSafeHwnd(); "pDwN$c
data.uID=98; FZW)C'j
Shell_NotifyIcon(NIM_DELETE,&data); FY^[?lj
ShowWindow(SW_SHOW); dU7+rc2,CU
SetForegroundWindow(); (QPfrR=J4
ShowWindow(SW_SHOWNORMAL); BrdHTk= Vy
bTray=FALSE; y&HfF~
} f__r" N
dPdodjSu,!
void CCaptureDlg::OnChange() #bqc}h9
{ l Ikh4T6i
RegisterHotkey(); {xw"t9(fE
}
1^*M*>&d<
z%Xz*uu(|
BOOL CCaptureDlg::RegisterHotkey() VOkEDH
{ 1keH 1[
UpdateData(); I.[2-~yf
UCHAR mask=0; &i&k 4
UCHAR key=0; gy
Jx>i
if(m_bControl) 5AvbKT
mask|=4; !$/1Q+
if(m_bAlt) :N \j@yJK
mask|=2; U#I8Rd I,
if(m_bShift) p7UdZOi2
mask|=1; `aj;FrF
key=Key_Table[m_Key.GetCurSel()]; 7X
h'VOljB
if(bRegistered){ Op&i6V}<s
DeleteHotkey(GetSafeHwnd(),cKey,cMask); h&$7^P
bRegistered=FALSE; }r}$8M+1
} }tvLe3O
cMask=mask; l\PDou@5
cKey=key; 8n.sg({g
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); MeXzWLH
return bRegistered; bbDl?m&bq
} 8i H'cX
ax]Pa*C}
四、小结 WOW:$.VO^
z|w@eQ",
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。