我不确定如何说出这个问题，所以希望这是有道理的......
我有一个GUI工作，从板上读取值，并在窗口中显示它们。这个窗口也有一个菜单。我的问题是，当我点击一个菜单项时，它似乎在完成之前跳出了我的更新功能，这让我从我的电路板发出通信错误（因为在切换到菜单处理之前命令没有完成） 。问题是间歇性的，因为在更新功能运行时我并不总是单击菜单。
其他一些信息： 使用以下
定期发送Update功能PostMessage（hwnd，WM_COMMAND，WM_USER + 1，NULL）;
case WM_USER+1:
{
debugFunc = 2;
Update();
InvalidateRect(hwnd, NULL, FALSE);
debugFunc = 2;
}
debugFunc整数用于调试...每当窗口发送WM_ENTERMENULOOP或WM_EXITMENULOOP时，我会查看这个debugFunc值是什么...每当我遇到通信错误时，debugFunc == 4（debugFunc设置）在更新功能4）...意味着在调用菜单之前，这个WM_USER + 1 msg没有完成。
那么，是否可以通过菜单调用给出消息WM_USER + 1或函数Update更高优先级？那么在显示菜单项之前必须完成WM_USER + 1或Update？
编辑::这里更新，它只是使用I2C适配器发送一堆消息来获取读取.. 我没有写任何iPortAIMaster函数，它们带有适配器
void Update()
{
int receiveLength = 0;
debugFunc = 4;
//The following CStrings hold a string value that is to be updated to the window
CString newVoltage, newCurrent, newPower, newStatus;
CString StatusDisplay;
//The following act like flags
//If STATUS_WORD VOUT bit is set, checkVout = 1...meaning all pages must have their Vout Status checked
//The rest follow in a similar fashion
int checkTemp = 0, checkVout = 0, checkIout = 0, checkInput = 0;
//Holds the pBuf data output from a MasterTxRx command is sent
//Holds the new voltage or new current values
//Must be translated to a CString to update the window
BYTE *nV, *nC;
//Holds a bit position
int bit;
float valueV, valueC;
if (isOn)
{
pBufStatus[0] = 0x79; //STATUS_WORD
////buf += "\r\n Sending the STATUS_WORD command to check for errors";
//BYTE I2CAddr, BYTE *pBufStatus, unsigned int TxLen, unsigned int RxLen, BYTE doStop, UINT time
newPort.iPortAIMasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 820);
//Get the PAGE reading, value is placed in pBufStatus
receiveLength = newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
//Store pBufStatus
pBufWORD[0] = pBufStatus[0];
pBufWORD[1] = pBufStatus[1];
#pragma region "Reading and Updating the window"
#pragma region "Reading new IN Volt Cur Pow"
{
valueV = 0;
valueC = 0;
//Read_VIN
pBufStatus[0] = 0x88; //Read_VIN Command
pBufStatus[1] = 0; //Clear out earlier command
//Send Read_VIN command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
//Read_IIN command
pBufStatus[0] = 0x89; //Read_IIN Command
//Send Read_IIN command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nC = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueC = ((int)valueC << 8) + pBufStatus[1];
valueC = ((int)valueC << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueC = valueC / 100;
newCurrent.Format("%.2f", valueC);
newPower.Format("%.2f", (valueC*valueV));
//SetWindowText(VoltIn, newVoltage);
//SetWindowText(CurIn, newCurrent);
//SetWindowText(PowIn, newPower);
VoltInR = newVoltage;
CurInR = newCurrent;
PowInR = newPower;
}
#pragma endregion
#pragma region "Reading new Temperatures"
{
valueV = 0;
//READ_TEMPERATURE_1
pBufStatus[0] = 0x8D; //Read_VIN READ_TEMPERATURE_1
pBufStatus[1] = 0; //Clear out earlier command
//Send READ_TEMPERATURE_1 command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
//SetWindowText(TempU11, newVoltage);
TempU11R = newVoltage;
valueV = 0;
//READ_TEMPERATURE_2
pBufStatus[0] = 0x8E; //Read_VIN READ_TEMPERATURE_2
pBufStatus[1] = 0; //Clear out earlier command
//Send READ_TEMPERATURE_2 command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
//SetWindowText(TempU12, newVoltage);
TempU12R = newVoltage;
valueV = 0;
//READ_TEMPERATURE_3
pBufStatus[0] = 0x8F; //Read_VIN READ_TEMPERATURE_3
pBufStatus[1] = 0; //Clear out earlier command
//Send READ_TEMPERATURE_3 command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
//SetWindowText(TempU13, newVoltage);
TempU13R = newVoltage;
}
#pragma endregion
for (int i = 0; i < 11; i++)
{
valueV = 0;
valueC = 0;
//FOR LOOP Index thru pages
//i = 0 +5V
//i = 1 +3.3V
//i = 2 +12V
//i = 3 -12V
//i = 4 +12V_AUX
//i = 10 +28V_Input
pBufStatus[0] = 0x00; //Page Command
pBufStatus[1] = (char)i; //Page Number
MasterTx(I2CAddr, pBufStatus, 2, 1, 60);
#pragma region "Reading new OUT Volt Cur Pow"
switch (i)
{
case 0:
case 1:
case 2:
{
//Read_VOUT
pBufStatus[0] = 0x8B; //Read_Vout Command
pBufStatus[1] = 0; //Clear out earlier command
//Send Read_VOUT command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
//Read_IOUT command
pBufStatus[0] = 0x8C; //Read_Iout Command
//Send Read_IOUT command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nC = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueC = ((int)valueC << 8) + pBufStatus[1];
valueC = ((int)valueC << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueC = valueC / 100;
newCurrent.Format("%.2f", valueC);
newPower.Format("%.2f", (valueC*valueV));
break;
}
case 3:
case 4:
{
//Read_VOUT
pBufStatus[0] = 0x8B; //Read_Vout Command
pBufStatus[1] = 0; //Clear out earlier command
//Send Read_VOUT command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
break;
}
case 10:
{
//Read_VOUT
pBufStatus[0] = 0x8B; //Read_Vout Command
pBufStatus[1] = 0; //Clear out earlier command
//Send Read_VOUT command
MasterTxRx(I2CAddr, pBufStatus, 1, 2, 1, 120);
//Get the Voltage Reading, value is placed in pBufStatus
newPort.iPortAIGetMasterRxMsg(512, pBufStatus);
nV = pBufStatus; //Save Copy
//CONVERT THE VALUE TO USEABLE FORM
valueV = ((int)valueV << 8) + pBufStatus[1];
valueV = ((int)valueV << 8) + pBufStatus[0];
//Multiply by 100 for formatting
valueV = valueV / 100;
newVoltage.Format("%.2f", valueV);
break;
}
}
#pragma endregion
#pragma region "Display reading"
switch (i) //switch on the page number, display new values and checks faults if needed
{
case 0: //+5V
{
#pragma region "5V Display"
{
//SEND OUTPUT TO WINDOW USING SetWindowText();
//SetWindowText(Volt5at24, newVoltage);
Volt5at24R = newVoltage;
//SetWindowText(Cur5at24, newCurrent);
Cur5at24R = newCurrent;
//SetWindowText(Pow5at24, newPower);
Pow5at24R = newPower;
break;
}
#pragma endregion
}
case 1: //+3.3V
{
#pragma region "3.3V Display"
{
//SEND OUTPUT TO WINDOW USING SetWindowText();
//SetWindowText(Volt3at15, newVoltage);
Volt3at15R = newVoltage;
//SetWindowText(Cur3at15, newCurrent);
Cur3at15R = newCurrent;
//SetWindowText(Pow3at15, newPower);
Pow3at15R = newPower;
break;
}
#pragma endregion
}
case 2: //+12V
{
#pragma region "12V Display"
{
//SEND OUTPUT TO WINDOW USING SetWindowText();
//SetWindowText(Volt12at1, newVoltage);
Volt12at1R = newVoltage;
//SetWindowText(Cur12at1, newCurrent);
Cur12at1R = newCurrent;
//SetWindowText(Pow12at1, newPower);
Pow12at1R = newPower;
break;
}
#pragma endregion
}
case 3: //-12V
{
#pragma region "-12V Display"
{
//SEND OUTPUT TO WINDOW USING SetWindowText();
//SetWindowText(Volt12at2, newVoltage);
Volt12at2R = newVoltage;
}
#pragma endregion
}
case 4: //+12V AUX
{
#pragma region "12V AUX Display"
{
//SEND OUTPUT TO WINDOW USING SetWindowText();
//SetWindowText(Volt12at40, newVoltage);
Volt12at40R = newVoltage;
}
#pragma endregion
}
case 10: //+28V input
{
#pragma region "3.3 HSKPR Display"
{
//SEND OUTPUT TO WINDOW USING SetWindowText();
//SetWindowText(VoltIn, newVoltage);
Volt3HR = newVoltage;
break;
}
#pragma endregion
}
}
#pragma endregion
}
#pragma endregion
}
}