Question

我遇到了Windows窗体中不同图像大小和PictureBox的问题。该框大640*480像素。显示各种图像大小的工作正常，但是一些图像大小导致程序在我将位图分配给Picturebox的行中出现Parameter is not valid异常时崩溃：

System::Drawing::Bitmap ^pictureBimage = gcnew System::Drawing::Bitmap(resEnhWidth, resEnhHeight, resEnhWidth * sizeof(char)* 3, System::Drawing::Imaging::PixelFormat::Format24bppRgb, (System::IntPtr) pictureBox24bitLargeImage);
this->pictureBox1->Image = pictureBimage;
this->pictureBox1->Show();

650*600也有效，640*480，但例如550*630导致崩溃。你们中有谁知道为什么以及如何解决这个问题？

干杯

修改：

这可能有助于解决问题：每次在pictureBox中显示图像时都会刷新pictureBox24bitLargeImage：

                     unsigned char* temp = getByteImFromImageData(showThis2, (hScrollBar2->Value)*width*height, width*height, manContrast);
                 for (int i = 0; i < width * height; i++){
                     memset(pictureBox24bitImage + 3 * i, *(temp + i), 3);
                 }
                 if (draw_Rectangle){
                     drawRectangle(pictureBox24bitImage, rect_upperLeftCorner, rect_lowerRightCorner, width, height);
                 }
                 free(temp);

临时数组包含0到255之间的值。使用getByteImFromImageData函数创建，它采用双数组并重新调整0到255之间的双精度值。如果设置了手动对比度，则它会延伸用户定义值之间的doule值。以下是该函数的来源：

unsigned char* getByteImFromImageData(double *image, int start, int size, bool useManContrast){
unsigned char* newim;
newim = (unsigned char*)malloc(size*sizeof(unsigned char));
double mini = +INFINITY;
double maxi = 0;
if (!useManContrast){
    for (int i = 0; i < size; i++){
        if (*(image + start + i) > maxi) maxi = *(image + start + i);
        if (*(image + start + i) < mini) mini = *(image + start + i);
    }
    for (int i = 0; i < size; i++){
        *(newim + i) = (*(image + start + i) - mini) / (maxi - mini) * 255.0;
    }
}
else {
    mini = contrastMin;
    maxi = contrastMax;
    double temp;
    for (int i = 0; i < size; i++){
        temp = (*(image + start + i) - mini) / (maxi - mini) * 255.0;
        if (temp>255) temp = 255;
        if (temp < 0) temp = 0;
        *(newim + i) = (unsigned char) temp;
    }
}

return(newim);
}

Windows窗体PictureBox位图大小问题

0 个答案: